-
-int ff_h263_decode_mba(MpegEncContext *s)
-{
- int i, mb_pos;
-
- for(i=0; i<6; i++){
- if(s->mb_num-1 <= ff_mba_max[i]) break;
- }
- mb_pos= get_bits(&s->gb, ff_mba_length[i]);
- s->mb_x= mb_pos % s->mb_width;
- s->mb_y= mb_pos / s->mb_width;
-
- return mb_pos;
-}
-
-void ff_h263_encode_mba(MpegEncContext *s)
-{
- int i, mb_pos;
-
- for(i=0; i<6; i++){
- if(s->mb_num-1 <= ff_mba_max[i]) break;
- }
- mb_pos= s->mb_x + s->mb_width*s->mb_y;
- put_bits(&s->pb, ff_mba_length[i], mb_pos);
-}
-
-/**
- * decodes the group of blocks header or slice header.
- * @return <0 if an error occurred
- */
-static int h263_decode_gob_header(MpegEncContext *s)
-{
- unsigned int val, gfid, gob_number;
- int left;
-
- /* Check for GOB Start Code */
- val = show_bits(&s->gb, 16);
- if(val)
- return -1;
-
- /* We have a GBSC probably with GSTUFF */
- skip_bits(&s->gb, 16); /* Drop the zeros */
- left= s->gb.size_in_bits - get_bits_count(&s->gb);
- //MN: we must check the bits left or we might end in a infinite loop (or segfault)
- for(;left>13; left--){
- if(get_bits1(&s->gb)) break; /* Seek the '1' bit */
- }
- if(left<=13)
- return -1;
-
- if(s->h263_slice_structured){
- if(get_bits1(&s->gb)==0)
- return -1;
-
- ff_h263_decode_mba(s);
-
- if(s->mb_num > 1583)
- if(get_bits1(&s->gb)==0)
- return -1;
-
- s->qscale = get_bits(&s->gb, 5); /* SQUANT */
- if(get_bits1(&s->gb)==0)
- return -1;
- gfid = get_bits(&s->gb, 2); /* GFID */
- }else{
- gob_number = get_bits(&s->gb, 5); /* GN */
- s->mb_x= 0;
- s->mb_y= s->gob_index* gob_number;
- gfid = get_bits(&s->gb, 2); /* GFID */
- s->qscale = get_bits(&s->gb, 5); /* GQUANT */
- }
-
- if(s->mb_y >= s->mb_height)
- return -1;
-
- if(s->qscale==0)
- return -1;
-
- return 0;
-}
-
-static inline void memsetw(short *tab, int val, int n)
-{
- int i;
- for(i=0;i<n;i++)
- tab[i] = val;
-}
-
-#ifdef CONFIG_ENCODERS
-
-void ff_mpeg4_init_partitions(MpegEncContext *s)
-{
- uint8_t *start= pbBufPtr(&s->pb);
- uint8_t *end= s->pb.buf_end;
- int size= end - start;
- int pb_size = (((long)start + size/3)&(~3)) - (long)start;
- int tex_size= (size - 2*pb_size)&(~3);
-
- set_put_bits_buffer_size(&s->pb, pb_size);
- init_put_bits(&s->tex_pb, start + pb_size , tex_size);
- init_put_bits(&s->pb2 , start + pb_size + tex_size, pb_size);
-}
-
-void ff_mpeg4_merge_partitions(MpegEncContext *s)
-{
- const int pb2_len = put_bits_count(&s->pb2 );
- const int tex_pb_len= put_bits_count(&s->tex_pb);
- const int bits= put_bits_count(&s->pb);
-
- if(s->pict_type==FF_I_TYPE){
- put_bits(&s->pb, 19, DC_MARKER);
- s->misc_bits+=19 + pb2_len + bits - s->last_bits;
- s->i_tex_bits+= tex_pb_len;
- }else{
- put_bits(&s->pb, 17, MOTION_MARKER);
- s->misc_bits+=17 + pb2_len;
- s->mv_bits+= bits - s->last_bits;
- s->p_tex_bits+= tex_pb_len;
- }
-
- flush_put_bits(&s->pb2);
- flush_put_bits(&s->tex_pb);
-
- set_put_bits_buffer_size(&s->pb, s->pb2.buf_end - s->pb.buf);
- ff_copy_bits(&s->pb, s->pb2.buf , pb2_len);
- ff_copy_bits(&s->pb, s->tex_pb.buf, tex_pb_len);
- s->last_bits= put_bits_count(&s->pb);
-}
-
-#endif //CONFIG_ENCODERS
-
-int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s){
- switch(s->pict_type){
- case FF_I_TYPE:
- return 16;
- case FF_P_TYPE:
- case FF_S_TYPE:
- return s->f_code+15;
- case FF_B_TYPE:
- return FFMAX(FFMAX(s->f_code, s->b_code)+15, 17);
- default:
- return -1;
- }
-}
-
-#ifdef CONFIG_ENCODERS
-
-void ff_mpeg4_encode_video_packet_header(MpegEncContext *s)
-{
- int mb_num_bits= av_log2(s->mb_num - 1) + 1;
-
- put_bits(&s->pb, ff_mpeg4_get_video_packet_prefix_length(s), 0);
- put_bits(&s->pb, 1, 1);
-
- put_bits(&s->pb, mb_num_bits, s->mb_x + s->mb_y*s->mb_width);
- put_bits(&s->pb, s->quant_precision, s->qscale);
- put_bits(&s->pb, 1, 0); /* no HEC */
-}
-
-#endif //CONFIG_ENCODERS
-
-/**
- * check if the next stuff is a resync marker or the end.
- * @return 0 if not
- */
-static inline int mpeg4_is_resync(MpegEncContext *s){
- int bits_count= get_bits_count(&s->gb);
- int v= show_bits(&s->gb, 16);
-
- if(s->workaround_bugs&FF_BUG_NO_PADDING){
- return 0;
- }
-
- while(v<=0xFF){
- if(s->pict_type==FF_B_TYPE || (v>>(8-s->pict_type)!=1) || s->partitioned_frame)
- break;
- skip_bits(&s->gb, 8+s->pict_type);
- bits_count+= 8+s->pict_type;
- v= show_bits(&s->gb, 16);
- }
-
- if(bits_count + 8 >= s->gb.size_in_bits){
- v>>=8;
- v|= 0x7F >> (7-(bits_count&7));
-
- if(v==0x7F)
- return 1;
- }else{
- if(v == ff_mpeg4_resync_prefix[bits_count&7]){
- int len;
- GetBitContext gb= s->gb;
-
- skip_bits(&s->gb, 1);
- align_get_bits(&s->gb);
-
- for(len=0; len<32; len++){
- if(get_bits1(&s->gb)) break;
- }
-
- s->gb= gb;
-
- if(len>=ff_mpeg4_get_video_packet_prefix_length(s))
- return 1;
- }
- }
- return 0;
-}
-
-/**
- * decodes the next video packet.
- * @return <0 if something went wrong
- */
-static int mpeg4_decode_video_packet_header(MpegEncContext *s)
-{
- int mb_num_bits= av_log2(s->mb_num - 1) + 1;
- int header_extension=0, mb_num, len;
-
- /* is there enough space left for a video packet + header */
- if( get_bits_count(&s->gb) > s->gb.size_in_bits-20) return -1;
-
- for(len=0; len<32; len++){
- if(get_bits1(&s->gb)) break;
- }
-
- if(len!=ff_mpeg4_get_video_packet_prefix_length(s)){
- av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
- return -1;
- }
-
- if(s->shape != RECT_SHAPE){
- header_extension= get_bits1(&s->gb);
- //FIXME more stuff here
- }
-
- mb_num= get_bits(&s->gb, mb_num_bits);
- if(mb_num>=s->mb_num){
- av_log(s->avctx, AV_LOG_ERROR, "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
- return -1;
- }
- if(s->pict_type == FF_B_TYPE){
- while(s->next_picture.mbskip_table[ s->mb_index2xy[ mb_num ] ]) mb_num++;
- if(mb_num >= s->mb_num) return -1; // slice contains just skipped MBs which where already decoded
- }
-
- s->mb_x= mb_num % s->mb_width;
- s->mb_y= mb_num / s->mb_width;
-
- if(s->shape != BIN_ONLY_SHAPE){
- int qscale= get_bits(&s->gb, s->quant_precision);
- if(qscale)
- s->chroma_qscale=s->qscale= qscale;
- }
-
- if(s->shape == RECT_SHAPE){
- header_extension= get_bits1(&s->gb);
- }
- if(header_extension){
- int time_increment;
- int time_incr=0;
-
- while (get_bits1(&s->gb) != 0)
- time_incr++;
-
- check_marker(&s->gb, "before time_increment in video packed header");
- time_increment= get_bits(&s->gb, s->time_increment_bits);
- check_marker(&s->gb, "before vop_coding_type in video packed header");
-
- skip_bits(&s->gb, 2); /* vop coding type */
- //FIXME not rect stuff here
-
- if(s->shape != BIN_ONLY_SHAPE){
- skip_bits(&s->gb, 3); /* intra dc vlc threshold */
-//FIXME don't just ignore everything
- if(s->pict_type == FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE){
- mpeg4_decode_sprite_trajectory(s, &s->gb);
- av_log(s->avctx, AV_LOG_ERROR, "untested\n");
- }
-
- //FIXME reduced res stuff here
-
- if (s->pict_type != FF_I_TYPE) {
- int f_code = get_bits(&s->gb, 3); /* fcode_for */
- if(f_code==0){
- av_log(s->avctx, AV_LOG_ERROR, "Error, video packet header damaged (f_code=0)\n");
- }
- }
- if (s->pict_type == FF_B_TYPE) {
- int b_code = get_bits(&s->gb, 3);
- if(b_code==0){
- av_log(s->avctx, AV_LOG_ERROR, "Error, video packet header damaged (b_code=0)\n");
- }
- }
- }
- }
- //FIXME new-pred stuff
-
-//printf("parse ok %d %d %d %d\n", mb_num, s->mb_x + s->mb_y*s->mb_width, get_bits_count(gb), get_bits_count(&s->gb));
-
- return 0;
-}
-
-void ff_mpeg4_clean_buffers(MpegEncContext *s)
-{
- int c_wrap, c_xy, l_wrap, l_xy;
-
- l_wrap= s->b8_stride;
- l_xy= (2*s->mb_y-1)*l_wrap + s->mb_x*2 - 1;
- c_wrap= s->mb_stride;
- c_xy= (s->mb_y-1)*c_wrap + s->mb_x - 1;
-
-#if 0
- /* clean DC */
- memsetw(s->dc_val[0] + l_xy, 1024, l_wrap*2+1);
- memsetw(s->dc_val[1] + c_xy, 1024, c_wrap+1);
- memsetw(s->dc_val[2] + c_xy, 1024, c_wrap+1);
-#endif
-
- /* clean AC */
- memset(s->ac_val[0] + l_xy, 0, (l_wrap*2+1)*16*sizeof(int16_t));
- memset(s->ac_val[1] + c_xy, 0, (c_wrap +1)*16*sizeof(int16_t));
- memset(s->ac_val[2] + c_xy, 0, (c_wrap +1)*16*sizeof(int16_t));
-
- /* clean MV */
- // we can't clear the MVs as they might be needed by a b frame
-// memset(s->motion_val + l_xy, 0, (l_wrap*2+1)*2*sizeof(int16_t));
-// memset(s->motion_val, 0, 2*sizeof(int16_t)*(2 + s->mb_width*2)*(2 + s->mb_height*2));
- s->last_mv[0][0][0]=
- s->last_mv[0][0][1]=
- s->last_mv[1][0][0]=
- s->last_mv[1][0][1]= 0;
-}
-
-/**
- * decodes the group of blocks / video packet header.
- * @return <0 if no resync found
- */
-int ff_h263_resync(MpegEncContext *s){
- int left, ret;
-
- if(s->codec_id==CODEC_ID_MPEG4){
- skip_bits1(&s->gb);
- align_get_bits(&s->gb);
- }
-
- if(show_bits(&s->gb, 16)==0){
- if(s->codec_id==CODEC_ID_MPEG4)
- ret= mpeg4_decode_video_packet_header(s);
- else
- ret= h263_decode_gob_header(s);
- if(ret>=0)
- return 0;
- }
- //OK, it's not where it is supposed to be ...
- s->gb= s->last_resync_gb;
- align_get_bits(&s->gb);
- left= s->gb.size_in_bits - get_bits_count(&s->gb);
-
- for(;left>16+1+5+5; left-=8){
- if(show_bits(&s->gb, 16)==0){
- GetBitContext bak= s->gb;
-
- if(s->codec_id==CODEC_ID_MPEG4)
- ret= mpeg4_decode_video_packet_header(s);
- else
- ret= h263_decode_gob_header(s);
- if(ret>=0)
- return 0;
-
- s->gb= bak;
- }
- skip_bits(&s->gb, 8);
- }
-
- return -1;
-}
-
-/**
- * gets the average motion vector for a GMC MB.
- * @param n either 0 for the x component or 1 for y
- * @returns the average MV for a GMC MB
- */
-static inline int get_amv(MpegEncContext *s, int n){
- int x, y, mb_v, sum, dx, dy, shift;
- int len = 1 << (s->f_code + 4);
- const int a= s->sprite_warping_accuracy;
-
- if(s->workaround_bugs & FF_BUG_AMV)
- len >>= s->quarter_sample;
-
- if(s->real_sprite_warping_points==1){
- if(s->divx_version==500 && s->divx_build==413)
- sum= s->sprite_offset[0][n] / (1<<(a - s->quarter_sample));
- else
- sum= RSHIFT(s->sprite_offset[0][n]<<s->quarter_sample, a);
- }else{
- dx= s->sprite_delta[n][0];
- dy= s->sprite_delta[n][1];
- shift= s->sprite_shift[0];
- if(n) dy -= 1<<(shift + a + 1);
- else dx -= 1<<(shift + a + 1);
- mb_v= s->sprite_offset[0][n] + dx*s->mb_x*16 + dy*s->mb_y*16;
-
- sum=0;
- for(y=0; y<16; y++){
- int v;
-
- v= mb_v + dy*y;
- //XXX FIXME optimize
- for(x=0; x<16; x++){
- sum+= v>>shift;
- v+= dx;
- }
- }
- sum= RSHIFT(sum, a+8-s->quarter_sample);
- }
-
- if (sum < -len) sum= -len;
- else if (sum >= len) sum= len-1;
-
- return sum;
-}
-
-/**
- * decodes first partition.
- * @return number of MBs decoded or <0 if an error occurred
- */
-static int mpeg4_decode_partition_a(MpegEncContext *s){
- int mb_num;
- static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
-
- /* decode first partition */
- mb_num=0;
- s->first_slice_line=1;
- for(; s->mb_y<s->mb_height; s->mb_y++){
- ff_init_block_index(s);
- for(; s->mb_x<s->mb_width; s->mb_x++){
- const int xy= s->mb_x + s->mb_y*s->mb_stride;
- int cbpc;
- int dir=0;
-
- mb_num++;
- ff_update_block_index(s);
- if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1)
- s->first_slice_line=0;
-
- if(s->pict_type==FF_I_TYPE){
- int i;
-
- do{
- if(show_bits_long(&s->gb, 19)==DC_MARKER){
- return mb_num-1;
- }
-
- cbpc = get_vlc2(&s->gb, intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
- if (cbpc < 0){
- av_log(s->avctx, AV_LOG_ERROR, "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
- return -1;
- }
- }while(cbpc == 8);
-
- s->cbp_table[xy]= cbpc & 3;
- s->current_picture.mb_type[xy]= MB_TYPE_INTRA;
- s->mb_intra = 1;
-
- if(cbpc & 4) {
- ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
- }
- s->current_picture.qscale_table[xy]= s->qscale;
-
- s->mbintra_table[xy]= 1;
- for(i=0; i<6; i++){
- int dc_pred_dir;
- int dc= mpeg4_decode_dc(s, i, &dc_pred_dir);
- if(dc < 0){
- av_log(s->avctx, AV_LOG_ERROR, "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
- return -1;
- }
- dir<<=1;
- if(dc_pred_dir) dir|=1;
- }
- s->pred_dir_table[xy]= dir;
- }else{ /* P/S_TYPE */
- int mx, my, pred_x, pred_y, bits;
- int16_t * const mot_val= s->current_picture.motion_val[0][s->block_index[0]];
- const int stride= s->b8_stride*2;
-
-try_again:
- bits= show_bits(&s->gb, 17);
- if(bits==MOTION_MARKER){
- return mb_num-1;
- }
- skip_bits1(&s->gb);
- if(bits&0x10000){
- /* skip mb */
- if(s->pict_type==FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE){
- s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_GMC | MB_TYPE_L0;
- mx= get_amv(s, 0);
- my= get_amv(s, 1);
- }else{
- s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
- mx=my=0;
- }
- mot_val[0 ]= mot_val[2 ]=
- mot_val[0+stride]= mot_val[2+stride]= mx;
- mot_val[1 ]= mot_val[3 ]=
- mot_val[1+stride]= mot_val[3+stride]= my;
-
- if(s->mbintra_table[xy])
- ff_clean_intra_table_entries(s);
- continue;
- }
-
- cbpc = get_vlc2(&s->gb, inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
- if (cbpc < 0){
- av_log(s->avctx, AV_LOG_ERROR, "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
- return -1;
- }
- if(cbpc == 20)
- goto try_again;
-
- s->cbp_table[xy]= cbpc&(8+3); //8 is dquant
-
- s->mb_intra = ((cbpc & 4) != 0);
-
- if(s->mb_intra){
- s->current_picture.mb_type[xy]= MB_TYPE_INTRA;
- s->mbintra_table[xy]= 1;
- mot_val[0 ]= mot_val[2 ]=
- mot_val[0+stride]= mot_val[2+stride]= 0;
- mot_val[1 ]= mot_val[3 ]=
- mot_val[1+stride]= mot_val[3+stride]= 0;
- }else{
- if(s->mbintra_table[xy])
- ff_clean_intra_table_entries(s);
-
- if(s->pict_type==FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE && (cbpc & 16) == 0)
- s->mcsel= get_bits1(&s->gb);
- else s->mcsel= 0;
-
- if ((cbpc & 16) == 0) {
- /* 16x16 motion prediction */
-
- h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
- if(!s->mcsel){
- mx = h263_decode_motion(s, pred_x, s->f_code);
- if (mx >= 0xffff)
- return -1;
-
- my = h263_decode_motion(s, pred_y, s->f_code);
- if (my >= 0xffff)
- return -1;
- s->current_picture.mb_type[xy]= MB_TYPE_16x16 | MB_TYPE_L0;
- } else {
- mx = get_amv(s, 0);
- my = get_amv(s, 1);
- s->current_picture.mb_type[xy]= MB_TYPE_16x16 | MB_TYPE_GMC | MB_TYPE_L0;
- }
-
- mot_val[0 ]= mot_val[2 ] =
- mot_val[0+stride]= mot_val[2+stride]= mx;
- mot_val[1 ]= mot_val[3 ]=
- mot_val[1+stride]= mot_val[3+stride]= my;
- } else {
- int i;
- s->current_picture.mb_type[xy]= MB_TYPE_8x8 | MB_TYPE_L0;
- for(i=0;i<4;i++) {
- int16_t *mot_val= h263_pred_motion(s, i, 0, &pred_x, &pred_y);
- mx = h263_decode_motion(s, pred_x, s->f_code);
- if (mx >= 0xffff)
- return -1;
-
- my = h263_decode_motion(s, pred_y, s->f_code);
- if (my >= 0xffff)
- return -1;
- mot_val[0] = mx;
- mot_val[1] = my;
- }
- }
- }
- }
- }
- s->mb_x= 0;
- }
-
- return mb_num;
-}
-
-/**
- * decode second partition.
- * @return <0 if an error occurred
- */
-static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count){
- int mb_num=0;
- static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
-
- s->mb_x= s->resync_mb_x;
- s->first_slice_line=1;
- for(s->mb_y= s->resync_mb_y; mb_num < mb_count; s->mb_y++){
- ff_init_block_index(s);
- for(; mb_num < mb_count && s->mb_x<s->mb_width; s->mb_x++){
- const int xy= s->mb_x + s->mb_y*s->mb_stride;
-
- mb_num++;
- ff_update_block_index(s);
- if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1)
- s->first_slice_line=0;
-
- if(s->pict_type==FF_I_TYPE){
- int ac_pred= get_bits1(&s->gb);
- int cbpy = get_vlc2(&s->gb, cbpy_vlc.table, CBPY_VLC_BITS, 1);
- if(cbpy<0){
- av_log(s->avctx, AV_LOG_ERROR, "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
- return -1;
- }
-
- s->cbp_table[xy]|= cbpy<<2;
- s->current_picture.mb_type[xy] |= ac_pred*MB_TYPE_ACPRED;
- }else{ /* P || S_TYPE */
- if(IS_INTRA(s->current_picture.mb_type[xy])){
- int dir=0,i;
- int ac_pred = get_bits1(&s->gb);
- int cbpy = get_vlc2(&s->gb, cbpy_vlc.table, CBPY_VLC_BITS, 1);
-
- if(cbpy<0){
- av_log(s->avctx, AV_LOG_ERROR, "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
- return -1;
- }
-
- if(s->cbp_table[xy] & 8) {
- ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
- }
- s->current_picture.qscale_table[xy]= s->qscale;
-
- for(i=0; i<6; i++){
- int dc_pred_dir;
- int dc= mpeg4_decode_dc(s, i, &dc_pred_dir);
- if(dc < 0){
- av_log(s->avctx, AV_LOG_ERROR, "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
- return -1;
- }
- dir<<=1;
- if(dc_pred_dir) dir|=1;
- }
- s->cbp_table[xy]&= 3; //remove dquant
- s->cbp_table[xy]|= cbpy<<2;
- s->current_picture.mb_type[xy] |= ac_pred*MB_TYPE_ACPRED;
- s->pred_dir_table[xy]= dir;
- }else if(IS_SKIP(s->current_picture.mb_type[xy])){
- s->current_picture.qscale_table[xy]= s->qscale;
- s->cbp_table[xy]= 0;
- }else{
- int cbpy = get_vlc2(&s->gb, cbpy_vlc.table, CBPY_VLC_BITS, 1);
-
- if(cbpy<0){
- av_log(s->avctx, AV_LOG_ERROR, "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
- return -1;
- }
-
- if(s->cbp_table[xy] & 8) {
- ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
- }
- s->current_picture.qscale_table[xy]= s->qscale;
-
- s->cbp_table[xy]&= 3; //remove dquant
- s->cbp_table[xy]|= (cbpy^0xf)<<2;
- }
- }
- }
- if(mb_num >= mb_count) return 0;
- s->mb_x= 0;
- }
- return 0;
-}
-
-/**
- * decodes the first & second partition
- * @return <0 if error (and sets error type in the error_status_table)
- */
-int ff_mpeg4_decode_partitions(MpegEncContext *s)
-{
- int mb_num;
- const int part_a_error= s->pict_type==FF_I_TYPE ? (DC_ERROR|MV_ERROR) : MV_ERROR;
- const int part_a_end = s->pict_type==FF_I_TYPE ? (DC_END |MV_END) : MV_END;
-
- mb_num= mpeg4_decode_partition_a(s);
- if(mb_num<0){
- ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, part_a_error);
- return -1;
- }
-
- if(s->resync_mb_x + s->resync_mb_y*s->mb_width + mb_num > s->mb_num){
- av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
- ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, part_a_error);
- return -1;
- }
-
- s->mb_num_left= mb_num;
-
- if(s->pict_type==FF_I_TYPE){
- while(show_bits(&s->gb, 9) == 1)
- skip_bits(&s->gb, 9);
- if(get_bits_long(&s->gb, 19)!=DC_MARKER){
- av_log(s->avctx, AV_LOG_ERROR, "marker missing after first I partition at %d %d\n", s->mb_x, s->mb_y);
- return -1;
- }
- }else{
- while(show_bits(&s->gb, 10) == 1)
- skip_bits(&s->gb, 10);
- if(get_bits(&s->gb, 17)!=MOTION_MARKER){
- av_log(s->avctx, AV_LOG_ERROR, "marker missing after first P partition at %d %d\n", s->mb_x, s->mb_y);
- return -1;
- }
- }
- ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, part_a_end);
-
- if( mpeg4_decode_partition_b(s, mb_num) < 0){
- if(s->pict_type==FF_P_TYPE)
- ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, DC_ERROR);
- return -1;
- }else{
- if(s->pict_type==FF_P_TYPE)
- ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, DC_END);
- }
-
- return 0;
-}
-
-/**
- * decode partition C of one MB.
- * @return <0 if an error occurred
- */
-static int mpeg4_decode_partitioned_mb(MpegEncContext *s, DCTELEM block[6][64])
-{
- int cbp, mb_type;
- const int xy= s->mb_x + s->mb_y*s->mb_stride;
-
- mb_type= s->current_picture.mb_type[xy];
- cbp = s->cbp_table[xy];
-
- s->use_intra_dc_vlc= s->qscale < s->intra_dc_threshold;
-
- if(s->current_picture.qscale_table[xy] != s->qscale){
- ff_set_qscale(s, s->current_picture.qscale_table[xy] );
- }
-
- if (s->pict_type == FF_P_TYPE || s->pict_type==FF_S_TYPE) {
- int i;
- for(i=0; i<4; i++){
- s->mv[0][i][0] = s->current_picture.motion_val[0][ s->block_index[i] ][0];
- s->mv[0][i][1] = s->current_picture.motion_val[0][ s->block_index[i] ][1];
- }
- s->mb_intra = IS_INTRA(mb_type);
-
- if (IS_SKIP(mb_type)) {
- /* skip mb */
- for(i=0;i<6;i++)
- s->block_last_index[i] = -1;
- s->mv_dir = MV_DIR_FORWARD;
- s->mv_type = MV_TYPE_16X16;
- if(s->pict_type==FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE){
- s->mcsel=1;
- s->mb_skipped = 0;
- }else{
- s->mcsel=0;
- s->mb_skipped = 1;
- }
- }else if(s->mb_intra){
- s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
- }else if(!s->mb_intra){
-// s->mcsel= 0; //FIXME do we need to init that
-
- s->mv_dir = MV_DIR_FORWARD;
- if (IS_8X8(mb_type)) {
- s->mv_type = MV_TYPE_8X8;
- } else {
- s->mv_type = MV_TYPE_16X16;
- }
- }
- } else { /* I-Frame */
- s->mb_intra = 1;
- s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
- }
-
- if (!IS_SKIP(mb_type)) {
- int i;
- s->dsp.clear_blocks(s->block[0]);
- /* decode each block */
- for (i = 0; i < 6; i++) {
- if(mpeg4_decode_block(s, block[i], i, cbp&32, s->mb_intra, s->rvlc) < 0){
- av_log(s->avctx, AV_LOG_ERROR, "texture corrupted at %d %d %d\n", s->mb_x, s->mb_y, s->mb_intra);
- return -1;
- }
- cbp+=cbp;
- }
- }
-
- /* per-MB end of slice check */
-
- if(--s->mb_num_left <= 0){
-//printf("%06X %d\n", show_bits(&s->gb, 24), s->gb.size_in_bits - get_bits_count(&s->gb));
- if(mpeg4_is_resync(s))
- return SLICE_END;
- else
- return SLICE_NOEND;
- }else{
- if(mpeg4_is_resync(s)){
- const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
- if(s->cbp_table[xy+delta])
- return SLICE_END;
- }
- return SLICE_OK;
- }
-}
-
-/**
- * read the next MVs for OBMC. yes this is a ugly hack, feel free to send a patch :)
- */
-static void preview_obmc(MpegEncContext *s){
- GetBitContext gb= s->gb;
-
- int cbpc, i, pred_x, pred_y, mx, my;
- int16_t *mot_val;
- const int xy= s->mb_x + 1 + s->mb_y * s->mb_stride;
- const int stride= s->b8_stride*2;
-
- for(i=0; i<4; i++)
- s->block_index[i]+= 2;
- for(i=4; i<6; i++)
- s->block_index[i]+= 1;
- s->mb_x++;
-
- assert(s->pict_type == FF_P_TYPE);
-
- do{
- if (get_bits1(&s->gb)) {
- /* skip mb */
- mot_val = s->current_picture.motion_val[0][ s->block_index[0] ];
- mot_val[0 ]= mot_val[2 ]=
- mot_val[0+stride]= mot_val[2+stride]= 0;
- mot_val[1 ]= mot_val[3 ]=
- mot_val[1+stride]= mot_val[3+stride]= 0;
-
- s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
- goto end;
- }
- cbpc = get_vlc2(&s->gb, inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
- }while(cbpc == 20);
-
- if(cbpc & 4){
- s->current_picture.mb_type[xy]= MB_TYPE_INTRA;
- }else{
- get_vlc2(&s->gb, cbpy_vlc.table, CBPY_VLC_BITS, 1);
- if (cbpc & 8) {
- if(s->modified_quant){
- if(get_bits1(&s->gb)) skip_bits(&s->gb, 1);
- else skip_bits(&s->gb, 5);
- }else
- skip_bits(&s->gb, 2);
- }
-
- if ((cbpc & 16) == 0) {
- s->current_picture.mb_type[xy]= MB_TYPE_16x16 | MB_TYPE_L0;
- /* 16x16 motion prediction */
- mot_val= h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
- if (s->umvplus)
- mx = h263p_decode_umotion(s, pred_x);
- else
- mx = h263_decode_motion(s, pred_x, 1);
-
- if (s->umvplus)
- my = h263p_decode_umotion(s, pred_y);
- else
- my = h263_decode_motion(s, pred_y, 1);
-
- mot_val[0 ]= mot_val[2 ]=
- mot_val[0+stride]= mot_val[2+stride]= mx;
- mot_val[1 ]= mot_val[3 ]=
- mot_val[1+stride]= mot_val[3+stride]= my;
- } else {
- s->current_picture.mb_type[xy]= MB_TYPE_8x8 | MB_TYPE_L0;
- for(i=0;i<4;i++) {
- mot_val = h263_pred_motion(s, i, 0, &pred_x, &pred_y);
- if (s->umvplus)
- mx = h263p_decode_umotion(s, pred_x);
- else
- mx = h263_decode_motion(s, pred_x, 1);
-
- if (s->umvplus)
- my = h263p_decode_umotion(s, pred_y);
- else
- my = h263_decode_motion(s, pred_y, 1);
- if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
- skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
- mot_val[0] = mx;
- mot_val[1] = my;
- }
- }
- }
-end:
-
- for(i=0; i<4; i++)
- s->block_index[i]-= 2;
- for(i=4; i<6; i++)
- s->block_index[i]-= 1;
- s->mb_x--;
-
- s->gb= gb;
-}
-
-static void h263_decode_dquant(MpegEncContext *s){
- static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
-
- if(s->modified_quant){
- if(get_bits1(&s->gb))
- s->qscale= modified_quant_tab[get_bits1(&s->gb)][ s->qscale ];
- else
- s->qscale= get_bits(&s->gb, 5);
- }else
- s->qscale += quant_tab[get_bits(&s->gb, 2)];
- ff_set_qscale(s, s->qscale);
-}
-
-int ff_h263_decode_mb(MpegEncContext *s,
- DCTELEM block[6][64])
-{
- int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
- int16_t *mot_val;
- const int xy= s->mb_x + s->mb_y * s->mb_stride;
-
- assert(!s->h263_pred);
-
- if (s->pict_type == FF_P_TYPE) {
- do{
- if (get_bits1(&s->gb)) {
- /* skip mb */
- s->mb_intra = 0;
- for(i=0;i<6;i++)
- s->block_last_index[i] = -1;
- s->mv_dir = MV_DIR_FORWARD;
- s->mv_type = MV_TYPE_16X16;
- s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
- s->mv[0][0][0] = 0;
- s->mv[0][0][1] = 0;
- s->mb_skipped = !(s->obmc | s->loop_filter);
- goto end;
- }
- cbpc = get_vlc2(&s->gb, inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
- //fprintf(stderr, "\tCBPC: %d", cbpc);
- if (cbpc < 0){
- av_log(s->avctx, AV_LOG_ERROR, "cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
- return -1;
- }
- }while(cbpc == 20);
-
- s->dsp.clear_blocks(s->block[0]);
-
- dquant = cbpc & 8;
- s->mb_intra = ((cbpc & 4) != 0);
- if (s->mb_intra) goto intra;
-
- cbpy = get_vlc2(&s->gb, cbpy_vlc.table, CBPY_VLC_BITS, 1);
-
- if(s->alt_inter_vlc==0 || (cbpc & 3)!=3)
- cbpy ^= 0xF;
-
- cbp = (cbpc & 3) | (cbpy << 2);
- if (dquant) {
- h263_decode_dquant(s);
- }
-
- s->mv_dir = MV_DIR_FORWARD;
- if ((cbpc & 16) == 0) {
- s->current_picture.mb_type[xy]= MB_TYPE_16x16 | MB_TYPE_L0;
- /* 16x16 motion prediction */
- s->mv_type = MV_TYPE_16X16;
- h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
- if (s->umvplus)
- mx = h263p_decode_umotion(s, pred_x);
- else
- mx = h263_decode_motion(s, pred_x, 1);
-
- if (mx >= 0xffff)
- return -1;
-
- if (s->umvplus)
- my = h263p_decode_umotion(s, pred_y);
- else
- my = h263_decode_motion(s, pred_y, 1);
-
- if (my >= 0xffff)
- return -1;
- s->mv[0][0][0] = mx;
- s->mv[0][0][1] = my;
-
- if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
- skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
- } else {
- s->current_picture.mb_type[xy]= MB_TYPE_8x8 | MB_TYPE_L0;
- s->mv_type = MV_TYPE_8X8;
- for(i=0;i<4;i++) {
- mot_val = h263_pred_motion(s, i, 0, &pred_x, &pred_y);
- if (s->umvplus)
- mx = h263p_decode_umotion(s, pred_x);
- else
- mx = h263_decode_motion(s, pred_x, 1);
- if (mx >= 0xffff)
- return -1;
-
- if (s->umvplus)
- my = h263p_decode_umotion(s, pred_y);
- else
- my = h263_decode_motion(s, pred_y, 1);
- if (my >= 0xffff)
- return -1;
- s->mv[0][i][0] = mx;
- s->mv[0][i][1] = my;
- if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
- skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
- mot_val[0] = mx;
- mot_val[1] = my;
- }
- }
-
- /* decode each block */
- for (i = 0; i < 6; i++) {
- if (h263_decode_block(s, block[i], i, cbp&32) < 0)
- return -1;
- cbp+=cbp;
- }
-
- if(s->obmc){
- if(s->pict_type == FF_P_TYPE && s->mb_x+1<s->mb_width && s->mb_num_left != 1)
- preview_obmc(s);
- }
- } else if(s->pict_type==FF_B_TYPE) {
- int mb_type;
- const int stride= s->b8_stride;
- int16_t *mot_val0 = s->current_picture.motion_val[0][ 2*(s->mb_x + s->mb_y*stride) ];
- int16_t *mot_val1 = s->current_picture.motion_val[1][ 2*(s->mb_x + s->mb_y*stride) ];
-// const int mv_xy= s->mb_x + 1 + s->mb_y * s->mb_stride;
-
- //FIXME ugly
- mot_val0[0 ]= mot_val0[2 ]= mot_val0[0+2*stride]= mot_val0[2+2*stride]=
- mot_val0[1 ]= mot_val0[3 ]= mot_val0[1+2*stride]= mot_val0[3+2*stride]=
- mot_val1[0 ]= mot_val1[2 ]= mot_val1[0+2*stride]= mot_val1[2+2*stride]=
- mot_val1[1 ]= mot_val1[3 ]= mot_val1[1+2*stride]= mot_val1[3+2*stride]= 0;
-
- do{
- mb_type= get_vlc2(&s->gb, h263_mbtype_b_vlc.table, H263_MBTYPE_B_VLC_BITS, 2);
- if (mb_type < 0){
- av_log(s->avctx, AV_LOG_ERROR, "b mb_type damaged at %d %d\n", s->mb_x, s->mb_y);
- return -1;
- }
-
- mb_type= h263_mb_type_b_map[ mb_type ];
- }while(!mb_type);
-
- s->mb_intra = IS_INTRA(mb_type);
- if(HAS_CBP(mb_type)){
- s->dsp.clear_blocks(s->block[0]);
- cbpc = get_vlc2(&s->gb, cbpc_b_vlc.table, CBPC_B_VLC_BITS, 1);
- if(s->mb_intra){
- dquant = IS_QUANT(mb_type);
- goto intra;
- }
-
- cbpy = get_vlc2(&s->gb, cbpy_vlc.table, CBPY_VLC_BITS, 1);
-
- if (cbpy < 0){
- av_log(s->avctx, AV_LOG_ERROR, "b cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
- return -1;
- }
-
- if(s->alt_inter_vlc==0 || (cbpc & 3)!=3)
- cbpy ^= 0xF;
-
- cbp = (cbpc & 3) | (cbpy << 2);
- }else
- cbp=0;
-
- assert(!s->mb_intra);
-
- if(IS_QUANT(mb_type)){
- h263_decode_dquant(s);
- }
-
- if(IS_DIRECT(mb_type)){
- s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT;
- mb_type |= ff_mpeg4_set_direct_mv(s, 0, 0);
- }else{
- s->mv_dir = 0;
- s->mv_type= MV_TYPE_16X16;
-//FIXME UMV
-
- if(USES_LIST(mb_type, 0)){
- int16_t *mot_val= h263_pred_motion(s, 0, 0, &mx, &my);
- s->mv_dir = MV_DIR_FORWARD;
-
- mx = h263_decode_motion(s, mx, 1);
- my = h263_decode_motion(s, my, 1);
-
- s->mv[0][0][0] = mx;
- s->mv[0][0][1] = my;
- mot_val[0 ]= mot_val[2 ]= mot_val[0+2*stride]= mot_val[2+2*stride]= mx;
- mot_val[1 ]= mot_val[3 ]= mot_val[1+2*stride]= mot_val[3+2*stride]= my;
- }
-
- if(USES_LIST(mb_type, 1)){
- int16_t *mot_val= h263_pred_motion(s, 0, 1, &mx, &my);
- s->mv_dir |= MV_DIR_BACKWARD;
-
- mx = h263_decode_motion(s, mx, 1);
- my = h263_decode_motion(s, my, 1);
-
- s->mv[1][0][0] = mx;
- s->mv[1][0][1] = my;
- mot_val[0 ]= mot_val[2 ]= mot_val[0+2*stride]= mot_val[2+2*stride]= mx;
- mot_val[1 ]= mot_val[3 ]= mot_val[1+2*stride]= mot_val[3+2*stride]= my;
- }
- }
-
- s->current_picture.mb_type[xy]= mb_type;
-
- /* decode each block */
- for (i = 0; i < 6; i++) {
- if (h263_decode_block(s, block[i], i, cbp&32) < 0)
- return -1;
- cbp+=cbp;
- }
- } else { /* I-Frame */
- do{
- cbpc = get_vlc2(&s->gb, intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
- if (cbpc < 0){
- av_log(s->avctx, AV_LOG_ERROR, "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
- return -1;
- }
- }while(cbpc == 8);
-
- s->dsp.clear_blocks(s->block[0]);
-
- dquant = cbpc & 4;
- s->mb_intra = 1;
-intra:
- s->current_picture.mb_type[xy]= MB_TYPE_INTRA;
- if (s->h263_aic) {
- s->ac_pred = get_bits1(&s->gb);
- if(s->ac_pred){
- s->current_picture.mb_type[xy]= MB_TYPE_INTRA | MB_TYPE_ACPRED;
-
- s->h263_aic_dir = get_bits1(&s->gb);
- }
- }else
- s->ac_pred = 0;
-
- cbpy = get_vlc2(&s->gb, cbpy_vlc.table, CBPY_VLC_BITS, 1);
- if(cbpy<0){
- av_log(s->avctx, AV_LOG_ERROR, "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
- return -1;
- }
- cbp = (cbpc & 3) | (cbpy << 2);
- if (dquant) {
- h263_decode_dquant(s);
- }
-
- /* decode each block */
- for (i = 0; i < 6; i++) {
- if (h263_decode_block(s, block[i], i, cbp&32) < 0)
- return -1;
- cbp+=cbp;
- }
- }
-end:
-
- /* per-MB end of slice check */
- {
- int v= show_bits(&s->gb, 16);
-
- if(get_bits_count(&s->gb) + 16 > s->gb.size_in_bits){
- v>>= get_bits_count(&s->gb) + 16 - s->gb.size_in_bits;
- }
-
- if(v==0)
- return SLICE_END;
- }
-
- return SLICE_OK;
-}
-
-int ff_mpeg4_decode_mb(MpegEncContext *s,
- DCTELEM block[6][64])
-{
- int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
- int16_t *mot_val;
- static int8_t quant_tab[4] = { -1, -2, 1, 2 };
- const int xy= s->mb_x + s->mb_y * s->mb_stride;
-
- assert(s->h263_pred);
-
- if (s->pict_type == FF_P_TYPE || s->pict_type==FF_S_TYPE) {
- do{
- if (get_bits1(&s->gb)) {
- /* skip mb */
- s->mb_intra = 0;
- for(i=0;i<6;i++)
- s->block_last_index[i] = -1;
- s->mv_dir = MV_DIR_FORWARD;
- s->mv_type = MV_TYPE_16X16;
- if(s->pict_type==FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE){
- s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_GMC | MB_TYPE_16x16 | MB_TYPE_L0;
- s->mcsel=1;
- s->mv[0][0][0]= get_amv(s, 0);
- s->mv[0][0][1]= get_amv(s, 1);
-
- s->mb_skipped = 0;
- }else{
- s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
- s->mcsel=0;
- s->mv[0][0][0] = 0;
- s->mv[0][0][1] = 0;
- s->mb_skipped = 1;
- }
- goto end;
- }
- cbpc = get_vlc2(&s->gb, inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
- //fprintf(stderr, "\tCBPC: %d", cbpc);
- if (cbpc < 0){
- av_log(s->avctx, AV_LOG_ERROR, "cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
- return -1;
- }
- }while(cbpc == 20);
-
- s->dsp.clear_blocks(s->block[0]);
- dquant = cbpc & 8;
- s->mb_intra = ((cbpc & 4) != 0);
- if (s->mb_intra) goto intra;
-
- if(s->pict_type==FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE && (cbpc & 16) == 0)
- s->mcsel= get_bits1(&s->gb);
- else s->mcsel= 0;
- cbpy = get_vlc2(&s->gb, cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
-
- cbp = (cbpc & 3) | (cbpy << 2);
- if (dquant) {
- ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
- }
- if((!s->progressive_sequence) && (cbp || (s->workaround_bugs&FF_BUG_XVID_ILACE)))
- s->interlaced_dct= get_bits1(&s->gb);
-
- s->mv_dir = MV_DIR_FORWARD;
- if ((cbpc & 16) == 0) {
- if(s->mcsel){
- s->current_picture.mb_type[xy]= MB_TYPE_GMC | MB_TYPE_16x16 | MB_TYPE_L0;
- /* 16x16 global motion prediction */
- s->mv_type = MV_TYPE_16X16;
- mx= get_amv(s, 0);
- my= get_amv(s, 1);
- s->mv[0][0][0] = mx;
- s->mv[0][0][1] = my;
- }else if((!s->progressive_sequence) && get_bits1(&s->gb)){
- s->current_picture.mb_type[xy]= MB_TYPE_16x8 | MB_TYPE_L0 | MB_TYPE_INTERLACED;
- /* 16x8 field motion prediction */
- s->mv_type= MV_TYPE_FIELD;
-
- s->field_select[0][0]= get_bits1(&s->gb);
- s->field_select[0][1]= get_bits1(&s->gb);
-
- h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
-
- for(i=0; i<2; i++){
- mx = h263_decode_motion(s, pred_x, s->f_code);
- if (mx >= 0xffff)
- return -1;
-
- my = h263_decode_motion(s, pred_y/2, s->f_code);
- if (my >= 0xffff)
- return -1;
-
- s->mv[0][i][0] = mx;
- s->mv[0][i][1] = my;
- }
- }else{
- s->current_picture.mb_type[xy]= MB_TYPE_16x16 | MB_TYPE_L0;
- /* 16x16 motion prediction */
- s->mv_type = MV_TYPE_16X16;
- h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
- mx = h263_decode_motion(s, pred_x, s->f_code);
-
- if (mx >= 0xffff)
- return -1;
-
- my = h263_decode_motion(s, pred_y, s->f_code);
-
- if (my >= 0xffff)
- return -1;
- s->mv[0][0][0] = mx;
- s->mv[0][0][1] = my;
- }
- } else {
- s->current_picture.mb_type[xy]= MB_TYPE_8x8 | MB_TYPE_L0;
- s->mv_type = MV_TYPE_8X8;
- for(i=0;i<4;i++) {
- mot_val = h263_pred_motion(s, i, 0, &pred_x, &pred_y);
- mx = h263_decode_motion(s, pred_x, s->f_code);
- if (mx >= 0xffff)
- return -1;
-
- my = h263_decode_motion(s, pred_y, s->f_code);
- if (my >= 0xffff)
- return -1;
- s->mv[0][i][0] = mx;
- s->mv[0][i][1] = my;
- mot_val[0] = mx;
- mot_val[1] = my;
- }
- }
- } else if(s->pict_type==FF_B_TYPE) {
- int modb1; // first bit of modb
- int modb2; // second bit of modb
- int mb_type;
-
- s->mb_intra = 0; //B-frames never contain intra blocks
- s->mcsel=0; // ... true gmc blocks
-
- if(s->mb_x==0){
- for(i=0; i<2; i++){
- s->last_mv[i][0][0]=
- s->last_mv[i][0][1]=
- s->last_mv[i][1][0]=
- s->last_mv[i][1][1]= 0;
- }
- }
-
- /* if we skipped it in the future P Frame than skip it now too */
- s->mb_skipped= s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC
-
- if(s->mb_skipped){
- /* skip mb */
- for(i=0;i<6;i++)
- s->block_last_index[i] = -1;
-
- s->mv_dir = MV_DIR_FORWARD;
- s->mv_type = MV_TYPE_16X16;
- s->mv[0][0][0] = 0;
- s->mv[0][0][1] = 0;
- s->mv[1][0][0] = 0;
- s->mv[1][0][1] = 0;
- s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
- goto end;
- }
-
- modb1= get_bits1(&s->gb);
- if(modb1){
- mb_type= MB_TYPE_DIRECT2 | MB_TYPE_SKIP | MB_TYPE_L0L1; //like MB_TYPE_B_DIRECT but no vectors coded
- cbp=0;
- }else{
- modb2= get_bits1(&s->gb);
- mb_type= get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
- if(mb_type<0){
- av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
- return -1;
- }
- mb_type= mb_type_b_map[ mb_type ];
- if(modb2) cbp= 0;
- else{
- s->dsp.clear_blocks(s->block[0]);
- cbp= get_bits(&s->gb, 6);
- }
-
- if ((!IS_DIRECT(mb_type)) && cbp) {
- if(get_bits1(&s->gb)){
- ff_set_qscale(s, s->qscale + get_bits1(&s->gb)*4 - 2);
- }
- }
-
- if(!s->progressive_sequence){
- if(cbp)
- s->interlaced_dct= get_bits1(&s->gb);
-
- if(!IS_DIRECT(mb_type) && get_bits1(&s->gb)){
- mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
- mb_type &= ~MB_TYPE_16x16;
-
- if(USES_LIST(mb_type, 0)){
- s->field_select[0][0]= get_bits1(&s->gb);
- s->field_select[0][1]= get_bits1(&s->gb);
- }
- if(USES_LIST(mb_type, 1)){
- s->field_select[1][0]= get_bits1(&s->gb);
- s->field_select[1][1]= get_bits1(&s->gb);
- }
- }
- }
-
- s->mv_dir = 0;
- if((mb_type & (MB_TYPE_DIRECT2|MB_TYPE_INTERLACED)) == 0){
- s->mv_type= MV_TYPE_16X16;
-
- if(USES_LIST(mb_type, 0)){
- s->mv_dir = MV_DIR_FORWARD;
-
- mx = h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
- my = h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
- s->last_mv[0][1][0]= s->last_mv[0][0][0]= s->mv[0][0][0] = mx;
- s->last_mv[0][1][1]= s->last_mv[0][0][1]= s->mv[0][0][1] = my;
- }
-
- if(USES_LIST(mb_type, 1)){
- s->mv_dir |= MV_DIR_BACKWARD;
-
- mx = h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
- my = h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
- s->last_mv[1][1][0]= s->last_mv[1][0][0]= s->mv[1][0][0] = mx;
- s->last_mv[1][1][1]= s->last_mv[1][0][1]= s->mv[1][0][1] = my;
- }
- }else if(!IS_DIRECT(mb_type)){
- s->mv_type= MV_TYPE_FIELD;
-
- if(USES_LIST(mb_type, 0)){
- s->mv_dir = MV_DIR_FORWARD;
-
- for(i=0; i<2; i++){
- mx = h263_decode_motion(s, s->last_mv[0][i][0] , s->f_code);
- my = h263_decode_motion(s, s->last_mv[0][i][1]/2, s->f_code);
- s->last_mv[0][i][0]= s->mv[0][i][0] = mx;
- s->last_mv[0][i][1]= (s->mv[0][i][1] = my)*2;
- }
- }
-
- if(USES_LIST(mb_type, 1)){
- s->mv_dir |= MV_DIR_BACKWARD;
-
- for(i=0; i<2; i++){
- mx = h263_decode_motion(s, s->last_mv[1][i][0] , s->b_code);
- my = h263_decode_motion(s, s->last_mv[1][i][1]/2, s->b_code);
- s->last_mv[1][i][0]= s->mv[1][i][0] = mx;
- s->last_mv[1][i][1]= (s->mv[1][i][1] = my)*2;
- }
- }
- }
- }
-
- if(IS_DIRECT(mb_type)){
- if(IS_SKIP(mb_type))
- mx=my=0;
- else{
- mx = h263_decode_motion(s, 0, 1);
- my = h263_decode_motion(s, 0, 1);
- }
-
- s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT;
- mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
- }
- s->current_picture.mb_type[xy]= mb_type;
- } else { /* I-Frame */
- do{
- cbpc = get_vlc2(&s->gb, intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
- if (cbpc < 0){
- av_log(s->avctx, AV_LOG_ERROR, "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
- return -1;
- }
- }while(cbpc == 8);
-
- dquant = cbpc & 4;
- s->mb_intra = 1;
-intra:
- s->ac_pred = get_bits1(&s->gb);
- if(s->ac_pred)
- s->current_picture.mb_type[xy]= MB_TYPE_INTRA | MB_TYPE_ACPRED;
- else
- s->current_picture.mb_type[xy]= MB_TYPE_INTRA;
-
- cbpy = get_vlc2(&s->gb, cbpy_vlc.table, CBPY_VLC_BITS, 1);
- if(cbpy<0){
- av_log(s->avctx, AV_LOG_ERROR, "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
- return -1;
- }
- cbp = (cbpc & 3) | (cbpy << 2);
-
- s->use_intra_dc_vlc= s->qscale < s->intra_dc_threshold;
-
- if (dquant) {
- ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
- }
-
- if(!s->progressive_sequence)
- s->interlaced_dct= get_bits1(&s->gb);
-
- s->dsp.clear_blocks(s->block[0]);
- /* decode each block */
- for (i = 0; i < 6; i++) {
- if (mpeg4_decode_block(s, block[i], i, cbp&32, 1, 0) < 0)
- return -1;
- cbp+=cbp;
- }
- goto end;
- }
-
- /* decode each block */
- for (i = 0; i < 6; i++) {
- if (mpeg4_decode_block(s, block[i], i, cbp&32, 0, 0) < 0)
- return -1;
- cbp+=cbp;
- }
-end:
-
- /* per-MB end of slice check */
- if(s->codec_id==CODEC_ID_MPEG4){
- if(mpeg4_is_resync(s)){
- const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
- if(s->pict_type==FF_B_TYPE && s->next_picture.mbskip_table[xy + delta])
- return SLICE_OK;
- return SLICE_END;
- }
- }
-
- return SLICE_OK;
-}
-
-static int h263_decode_motion(MpegEncContext * s, int pred, int f_code)
-{
- int code, val, sign, shift, l;
- code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
-
- if (code == 0)
- return pred;
- if (code < 0)
- return 0xffff;
-
- sign = get_bits1(&s->gb);
- shift = f_code - 1;
- val = code;
- if (shift) {
- val = (val - 1) << shift;
- val |= get_bits(&s->gb, shift);
- val++;
- }
- if (sign)
- val = -val;
- val += pred;
-
- /* modulo decoding */
- if (!s->h263_long_vectors) {
- l = INT_BIT - 5 - f_code;
- val = (val<<l)>>l;
- } else {
- /* horrible h263 long vector mode */
- if (pred < -31 && val < -63)
- val += 64;
- if (pred > 32 && val > 63)
- val -= 64;
-
- }
- return val;
-}
-
-/* Decodes RVLC of H.263+ UMV */
-static int h263p_decode_umotion(MpegEncContext * s, int pred)
-{
- int code = 0, sign;
-
- if (get_bits1(&s->gb)) /* Motion difference = 0 */
- return pred;
-
- code = 2 + get_bits1(&s->gb);
-
- while (get_bits1(&s->gb))
- {
- code <<= 1;
- code += get_bits1(&s->gb);
- }
- sign = code & 1;
- code >>= 1;
-
- code = (sign) ? (pred - code) : (pred + code);
-#ifdef DEBUG
- av_log( s->avctx, AV_LOG_DEBUG,"H.263+ UMV Motion = %d\n", code);
-#endif
- return code;
-
-}
-
-static int h263_decode_block(MpegEncContext * s, DCTELEM * block,
- int n, int coded)
-{
- int code, level, i, j, last, run;
- RLTable *rl = &rl_inter;
- const uint8_t *scan_table;
- GetBitContext gb= s->gb;
-
- scan_table = s->intra_scantable.permutated;
- if (s->h263_aic && s->mb_intra) {
- rl = &rl_intra_aic;
- i = 0;
- if (s->ac_pred) {
- if (s->h263_aic_dir)
- scan_table = s->intra_v_scantable.permutated; /* left */
- else
- scan_table = s->intra_h_scantable.permutated; /* top */
- }
- } else if (s->mb_intra) {
- /* DC coef */
- if(s->codec_id == CODEC_ID_RV10){
-#ifdef CONFIG_RV10_DECODER
- if (s->rv10_version == 3 && s->pict_type == FF_I_TYPE) {
- int component, diff;
- component = (n <= 3 ? 0 : n - 4 + 1);
- level = s->last_dc[component];
- if (s->rv10_first_dc_coded[component]) {
- diff = rv_decode_dc(s, n);
- if (diff == 0xffff)
- return -1;
- level += diff;
- level = level & 0xff; /* handle wrap round */
- s->last_dc[component] = level;
- } else {
- s->rv10_first_dc_coded[component] = 1;
- }
- } else {
- level = get_bits(&s->gb, 8);
- if (level == 255)
- level = 128;
- }
-#endif
- }else{
- level = get_bits(&s->gb, 8);
- if((level&0x7F) == 0){
- av_log(s->avctx, AV_LOG_ERROR, "illegal dc %d at %d %d\n", level, s->mb_x, s->mb_y);
- if(s->error_resilience >= FF_ER_COMPLIANT)
- return -1;
- }
- if (level == 255)
- level = 128;
- }
- block[0] = level;
- i = 1;
- } else {
- i = 0;
- }
- if (!coded) {
- if (s->mb_intra && s->h263_aic)
- goto not_coded;
- s->block_last_index[n] = i - 1;
- return 0;
- }
-retry:
- for(;;) {
- code = get_vlc2(&s->gb, rl->vlc.table, TEX_VLC_BITS, 2);
- if (code < 0){
- av_log(s->avctx, AV_LOG_ERROR, "illegal ac vlc code at %dx%d\n", s->mb_x, s->mb_y);
- return -1;
- }
- if (code == rl->n) {
- /* escape */
- if (s->h263_flv > 1) {
- int is11 = get_bits1(&s->gb);
- last = get_bits1(&s->gb);
- run = get_bits(&s->gb, 6);
- if(is11){
- level = get_sbits(&s->gb, 11);
- } else {
- level = get_sbits(&s->gb, 7);
- }
- } else {
- last = get_bits1(&s->gb);
- run = get_bits(&s->gb, 6);
- level = (int8_t)get_bits(&s->gb, 8);
- if(level == -128){
- if (s->codec_id == CODEC_ID_RV10) {
- /* XXX: should patch encoder too */
- level = get_sbits(&s->gb, 12);
- }else{
- level = get_bits(&s->gb, 5);
- level |= get_sbits(&s->gb, 6)<<5;
- }
- }
- }
- } else {
- run = rl->table_run[code];
- level = rl->table_level[code];
- last = code >= rl->last;
- if (get_bits1(&s->gb))
- level = -level;
- }
- i += run;
- if (i >= 64){
- if(s->alt_inter_vlc && rl == &rl_inter && !s->mb_intra){
- //Looks like a hack but no, it's the way it is supposed to work ...
- rl = &rl_intra_aic;
- i = 0;
- s->gb= gb;
- memset(block, 0, sizeof(DCTELEM)*64);
- goto retry;
- }
- av_log(s->avctx, AV_LOG_ERROR, "run overflow at %dx%d i:%d\n", s->mb_x, s->mb_y, s->mb_intra);
- return -1;
- }
- j = scan_table[i];
- block[j] = level;
- if (last)
- break;
- i++;
- }
-not_coded:
- if (s->mb_intra && s->h263_aic) {
- h263_pred_acdc(s, block, n);
- i = 63;
- }
- s->block_last_index[n] = i;
- return 0;
-}
-
-/**
- * decodes the dc value.
- * @param n block index (0-3 are luma, 4-5 are chroma)
- * @param dir_ptr the prediction direction will be stored here
- * @return the quantized dc
- */
-static inline int mpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr)
-{
- int level, code;
-
- if (n < 4)
- code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
- else
- code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
- if (code < 0 || code > 9 /* && s->nbit<9 */){
- av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
- return -1;
- }
- if (code == 0) {
- level = 0;
- } else {
- if(IS_3IV1){
- if(code==1)
- level= 2*get_bits1(&s->gb)-1;
- else{
- if(get_bits1(&s->gb))
- level = get_bits(&s->gb, code-1) + (1<<(code-1));
- else
- level = -get_bits(&s->gb, code-1) - (1<<(code-1));
- }
- }else{
- level = get_xbits(&s->gb, code);
- }
-
- if (code > 8){
- if(get_bits1(&s->gb)==0){ /* marker */
- if(s->error_resilience>=2){
- av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
- return -1;
- }
- }
- }
- }
-
- return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
-}
-
-/**
- * decodes a block.
- * @return <0 if an error occurred
- */
-static inline int mpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
- int n, int coded, int intra, int rvlc)
-{
- int level, i, last, run;
- int dc_pred_dir;
- RLTable * rl;
- RL_VLC_ELEM * rl_vlc;
- const uint8_t * scan_table;
- int qmul, qadd;
-
- //Note intra & rvlc should be optimized away if this is inlined
-
- if(intra) {
- if(s->use_intra_dc_vlc){
- /* DC coef */
- if(s->partitioned_frame){
- level = s->dc_val[0][ s->block_index[n] ];
- if(n<4) level= FASTDIV((level + (s->y_dc_scale>>1)), s->y_dc_scale);
- else level= FASTDIV((level + (s->c_dc_scale>>1)), s->c_dc_scale);
- dc_pred_dir= (s->pred_dir_table[s->mb_x + s->mb_y*s->mb_stride]<<n)&32;
- }else{
- level = mpeg4_decode_dc(s, n, &dc_pred_dir);
- if (level < 0)
- return -1;
- }
- block[0] = level;
- i = 0;
- }else{
- i = -1;
- ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
- }
- if (!coded)
- goto not_coded;
-
- if(rvlc){
- rl = &rvlc_rl_intra;
- rl_vlc = rvlc_rl_intra.rl_vlc[0];
- }else{
- rl = &rl_intra;
- rl_vlc = rl_intra.rl_vlc[0];
- }
- if (s->ac_pred) {
- if (dc_pred_dir == 0)
- scan_table = s->intra_v_scantable.permutated; /* left */
- else
- scan_table = s->intra_h_scantable.permutated; /* top */
- } else {
- scan_table = s->intra_scantable.permutated;
- }
- qmul=1;
- qadd=0;
- } else {
- i = -1;
- if (!coded) {
- s->block_last_index[n] = i;
- return 0;
- }
- if(rvlc) rl = &rvlc_rl_inter;
- else rl = &rl_inter;
-
- scan_table = s->intra_scantable.permutated;
-
- if(s->mpeg_quant){
- qmul=1;
- qadd=0;
- if(rvlc){
- rl_vlc = rvlc_rl_inter.rl_vlc[0];
- }else{
- rl_vlc = rl_inter.rl_vlc[0];
- }
- }else{
- qmul = s->qscale << 1;
- qadd = (s->qscale - 1) | 1;
- if(rvlc){
- rl_vlc = rvlc_rl_inter.rl_vlc[s->qscale];
- }else{
- rl_vlc = rl_inter.rl_vlc[s->qscale];
- }
- }
- }
- {
- OPEN_READER(re, &s->gb);
- for(;;) {
- UPDATE_CACHE(re, &s->gb);
- GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
- if (level==0) {
- /* escape */
- if(rvlc){
- if(SHOW_UBITS(re, &s->gb, 1)==0){
- av_log(s->avctx, AV_LOG_ERROR, "1. marker bit missing in rvlc esc\n");
- return -1;
- }; SKIP_CACHE(re, &s->gb, 1);
-
- last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
- run= SHOW_UBITS(re, &s->gb, 6); LAST_SKIP_CACHE(re, &s->gb, 6);
- SKIP_COUNTER(re, &s->gb, 1+1+6);
- UPDATE_CACHE(re, &s->gb);
-
- if(SHOW_UBITS(re, &s->gb, 1)==0){
- av_log(s->avctx, AV_LOG_ERROR, "2. marker bit missing in rvlc esc\n");
- return -1;
- }; SKIP_CACHE(re, &s->gb, 1);
-
- level= SHOW_UBITS(re, &s->gb, 11); SKIP_CACHE(re, &s->gb, 11);
-
- if(SHOW_UBITS(re, &s->gb, 5)!=0x10){
- av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
- return -1;
- }; SKIP_CACHE(re, &s->gb, 5);
-
- level= level * qmul + qadd;
- level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); LAST_SKIP_CACHE(re, &s->gb, 1);
- SKIP_COUNTER(re, &s->gb, 1+11+5+1);
-
- i+= run + 1;
- if(last) i+=192;
- }else{
- int cache;
- cache= GET_CACHE(re, &s->gb);
-
- if(IS_3IV1)
- cache ^= 0xC0000000;
-
- if (cache&0x80000000) {
- if (cache&0x40000000) {
- /* third escape */
- SKIP_CACHE(re, &s->gb, 2);
- last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
- run= SHOW_UBITS(re, &s->gb, 6); LAST_SKIP_CACHE(re, &s->gb, 6);
- SKIP_COUNTER(re, &s->gb, 2+1+6);
- UPDATE_CACHE(re, &s->gb);
-
- if(IS_3IV1){
- level= SHOW_SBITS(re, &s->gb, 12); LAST_SKIP_BITS(re, &s->gb, 12);
- }else{
- if(SHOW_UBITS(re, &s->gb, 1)==0){
- av_log(s->avctx, AV_LOG_ERROR, "1. marker bit missing in 3. esc\n");
- return -1;
- }; SKIP_CACHE(re, &s->gb, 1);
-
- level= SHOW_SBITS(re, &s->gb, 12); SKIP_CACHE(re, &s->gb, 12);
-
- if(SHOW_UBITS(re, &s->gb, 1)==0){
- av_log(s->avctx, AV_LOG_ERROR, "2. marker bit missing in 3. esc\n");
- return -1;
- }; LAST_SKIP_CACHE(re, &s->gb, 1);
-
- SKIP_COUNTER(re, &s->gb, 1+12+1);
- }
-
-#if 0
- if(s->error_resilience >= FF_ER_COMPLIANT){
- const int abs_level= FFABS(level);
- if(abs_level<=MAX_LEVEL && run<=MAX_RUN){
- const int run1= run - rl->max_run[last][abs_level] - 1;
- if(abs_level <= rl->max_level[last][run]){
- av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
- return -1;
- }
- if(s->error_resilience > FF_ER_COMPLIANT){
- if(abs_level <= rl->max_level[last][run]*2){
- av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
- return -1;
- }
- if(run1 >= 0 && abs_level <= rl->max_level[last][run1]){
- av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
- return -1;
- }
- }
- }
- }
-#endif
- if (level>0) level= level * qmul + qadd;
- else level= level * qmul - qadd;
-
- if((unsigned)(level + 2048) > 4095){
- if(s->error_resilience > FF_ER_COMPLIANT){
- if(level > 2560 || level<-2560){
- av_log(s->avctx, AV_LOG_ERROR, "|level| overflow in 3. esc, qp=%d\n", s->qscale);
- return -1;
- }
- }
- level= level<0 ? -2048 : 2047;
- }
-
- i+= run + 1;
- if(last) i+=192;
- } else {
- /* second escape */
-#if MIN_CACHE_BITS < 20
- LAST_SKIP_BITS(re, &s->gb, 2);
- UPDATE_CACHE(re, &s->gb);
-#else
- SKIP_BITS(re, &s->gb, 2);
-#endif
- GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
- i+= run + rl->max_run[run>>7][level/qmul] +1; //FIXME opt indexing
- level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
- LAST_SKIP_BITS(re, &s->gb, 1);
- }
- } else {
- /* first escape */
-#if MIN_CACHE_BITS < 19
- LAST_SKIP_BITS(re, &s->gb, 1);
- UPDATE_CACHE(re, &s->gb);
-#else
- SKIP_BITS(re, &s->gb, 1);
-#endif
- GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
- i+= run;
- level = level + rl->max_level[run>>7][(run-1)&63] * qmul;//FIXME opt indexing
- level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
- LAST_SKIP_BITS(re, &s->gb, 1);
- }
- }
- } else {
- i+= run;
- level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
- LAST_SKIP_BITS(re, &s->gb, 1);
- }
- if (i > 62){
- i-= 192;
- if(i&(~63)){
- av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
- return -1;
- }
-
- block[scan_table[i]] = level;
- break;
- }
-
- block[scan_table[i]] = level;
- }
- CLOSE_READER(re, &s->gb);
- }
- not_coded:
- if (intra) {
- if(!s->use_intra_dc_vlc){
- block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
-
- i -= i>>31; //if(i == -1) i=0;
- }
-
- mpeg4_pred_ac(s, block, n, dc_pred_dir);
- if (s->ac_pred) {
- i = 63; /* XXX: not optimal */
- }
- }
- s->block_last_index[n] = i;
- return 0;
-}
-
-/* most is hardcoded. should extend to handle all h263 streams */
-int h263_decode_picture_header(MpegEncContext *s)
-{
- int format, width, height, i;
- uint32_t startcode;
-
- align_get_bits(&s->gb);
-
- startcode= get_bits(&s->gb, 22-8);
-
- for(i= s->gb.size_in_bits - get_bits_count(&s->gb); i>24; i-=8) {
- startcode = ((startcode << 8) | get_bits(&s->gb, 8)) & 0x003FFFFF;
-
- if(startcode == 0x20)
- break;
- }
-
- if (startcode != 0x20) {
- av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n");
- return -1;
- }
- /* temporal reference */
- i = get_bits(&s->gb, 8); /* picture timestamp */
- if( (s->picture_number&~0xFF)+i < s->picture_number)
- i+= 256;
- s->current_picture_ptr->pts=
- s->picture_number= (s->picture_number&~0xFF) + i;
-
- /* PTYPE starts here */
- if (get_bits1(&s->gb) != 1) {
- /* marker */
- av_log(s->avctx, AV_LOG_ERROR, "Bad marker\n");
- return -1;
- }
- if (get_bits1(&s->gb) != 0) {
- av_log(s->avctx, AV_LOG_ERROR, "Bad H263 id\n");
- return -1; /* h263 id */
- }
- skip_bits1(&s->gb); /* split screen off */
- skip_bits1(&s->gb); /* camera off */
- skip_bits1(&s->gb); /* freeze picture release off */
-
- format = get_bits(&s->gb, 3);
- /*
- 0 forbidden
- 1 sub-QCIF
- 10 QCIF
- 7 extended PTYPE (PLUSPTYPE)
- */
-
- if (format != 7 && format != 6) {
- s->h263_plus = 0;
- /* H.263v1 */
- width = h263_format[format][0];
- height = h263_format[format][1];
- if (!width)
- return -1;
-
- s->pict_type = FF_I_TYPE + get_bits1(&s->gb);
-
- s->h263_long_vectors = get_bits1(&s->gb);
-
- if (get_bits1(&s->gb) != 0) {
- av_log(s->avctx, AV_LOG_ERROR, "H263 SAC not supported\n");
- return -1; /* SAC: off */
- }
- s->obmc= get_bits1(&s->gb); /* Advanced prediction mode */
- s->unrestricted_mv = s->h263_long_vectors || s->obmc;
-
- if (get_bits1(&s->gb) != 0) {
- av_log(s->avctx, AV_LOG_ERROR, "H263 PB frame not supported\n");
- return -1; /* not PB frame */
- }
- s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
- skip_bits1(&s->gb); /* Continuous Presence Multipoint mode: off */
-
- s->width = width;
- s->height = height;
- s->avctx->sample_aspect_ratio= (AVRational){12,11};
- s->avctx->time_base= (AVRational){1001, 30000};
- } else {
- int ufep;
-
- /* H.263v2 */
- s->h263_plus = 1;
- ufep = get_bits(&s->gb, 3); /* Update Full Extended PTYPE */
-
- /* ufep other than 0 and 1 are reserved */
- if (ufep == 1) {
- /* OPPTYPE */
- format = get_bits(&s->gb, 3);
- dprintf(s->avctx, "ufep=1, format: %d\n", format);
- s->custom_pcf= get_bits1(&s->gb);
- s->umvplus = get_bits1(&s->gb); /* Unrestricted Motion Vector */
- if (get_bits1(&s->gb) != 0) {
- av_log(s->avctx, AV_LOG_ERROR, "Syntax-based Arithmetic Coding (SAC) not supported\n");
- }
- s->obmc= get_bits1(&s->gb); /* Advanced prediction mode */
- s->h263_aic = get_bits1(&s->gb); /* Advanced Intra Coding (AIC) */
- s->loop_filter= get_bits1(&s->gb);
- s->unrestricted_mv = s->umvplus || s->obmc || s->loop_filter;
-
- s->h263_slice_structured= get_bits1(&s->gb);
- if (get_bits1(&s->gb) != 0) {
- av_log(s->avctx, AV_LOG_ERROR, "Reference Picture Selection not supported\n");
- }
- if (get_bits1(&s->gb) != 0) {
- av_log(s->avctx, AV_LOG_ERROR, "Independent Segment Decoding not supported\n");
- }
- s->alt_inter_vlc= get_bits1(&s->gb);
- s->modified_quant= get_bits1(&s->gb);
- if(s->modified_quant)
- s->chroma_qscale_table= ff_h263_chroma_qscale_table;
-
- skip_bits(&s->gb, 1); /* Prevent start code emulation */
-
- skip_bits(&s->gb, 3); /* Reserved */
- } else if (ufep != 0) {
- av_log(s->avctx, AV_LOG_ERROR, "Bad UFEP type (%d)\n", ufep);
- return -1;
- }
-
- /* MPPTYPE */
- s->pict_type = get_bits(&s->gb, 3);
- switch(s->pict_type){
- case 0: s->pict_type= FF_I_TYPE;break;
- case 1: s->pict_type= FF_P_TYPE;break;
- case 3: s->pict_type= FF_B_TYPE;break;
- case 7: s->pict_type= FF_I_TYPE;break; //ZYGO
- default:
- return -1;
- }
- skip_bits(&s->gb, 2);
- s->no_rounding = get_bits1(&s->gb);
- skip_bits(&s->gb, 4);
-
- /* Get the picture dimensions */
- if (ufep) {
- if (format == 6) {
- /* Custom Picture Format (CPFMT) */
- s->aspect_ratio_info = get_bits(&s->gb, 4);
- dprintf(s->avctx, "aspect: %d\n", s->aspect_ratio_info);
- /* aspect ratios:
- 0 - forbidden
- 1 - 1:1
- 2 - 12:11 (CIF 4:3)
- 3 - 10:11 (525-type 4:3)
- 4 - 16:11 (CIF 16:9)
- 5 - 40:33 (525-type 16:9)
- 6-14 - reserved
- */
- width = (get_bits(&s->gb, 9) + 1) * 4;
- skip_bits1(&s->gb);
- height = get_bits(&s->gb, 9) * 4;
- dprintf(s->avctx, "\nH.263+ Custom picture: %dx%d\n",width,height);
- if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) {
- /* aspected dimensions */
- s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 8);
- s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 8);
- }else{
- s->avctx->sample_aspect_ratio= pixel_aspect[s->aspect_ratio_info];
- }
- } else {
- width = h263_format[format][0];
- height = h263_format[format][1];
- s->avctx->sample_aspect_ratio= (AVRational){12,11};
- }
- if ((width == 0) || (height == 0))
- return -1;
- s->width = width;
- s->height = height;
-
- if(s->custom_pcf){
- int gcd;
- s->avctx->time_base.den= 1800000;
- s->avctx->time_base.num= 1000 + get_bits1(&s->gb);
- s->avctx->time_base.num*= get_bits(&s->gb, 7);
- if(s->avctx->time_base.num == 0){
- av_log(s, AV_LOG_ERROR, "zero framerate\n");
- return -1;
- }
- gcd= ff_gcd(s->avctx->time_base.den, s->avctx->time_base.num);
- s->avctx->time_base.den /= gcd;
- s->avctx->time_base.num /= gcd;
-// av_log(s->avctx, AV_LOG_DEBUG, "%d/%d\n", s->avctx->time_base.den, s->avctx->time_base.num);
- }else{
- s->avctx->time_base= (AVRational){1001, 30000};
- }
- }
-
- if(s->custom_pcf){
- skip_bits(&s->gb, 2); //extended Temporal reference
- }
-
- if (ufep) {
- if (s->umvplus) {
- if(get_bits1(&s->gb)==0) /* Unlimited Unrestricted Motion Vectors Indicator (UUI) */
- skip_bits1(&s->gb);
- }
- if(s->h263_slice_structured){
- if (get_bits1(&s->gb) != 0) {
- av_log(s->avctx, AV_LOG_ERROR, "rectangular slices not supported\n");
- }
- if (get_bits1(&s->gb) != 0) {
- av_log(s->avctx, AV_LOG_ERROR, "unordered slices not supported\n");
- }
- }
- }
-
- s->qscale = get_bits(&s->gb, 5);
- }
-
- s->mb_width = (s->width + 15) / 16;
- s->mb_height = (s->height + 15) / 16;
- s->mb_num = s->mb_width * s->mb_height;
-
- /* PEI */
- while (get_bits1(&s->gb) != 0) {
- skip_bits(&s->gb, 8);
- }
-
- if(s->h263_slice_structured){
- if (get_bits1(&s->gb) != 1) {
- av_log(s->avctx, AV_LOG_ERROR, "SEPB1 marker missing\n");
- return -1;
- }
-
- ff_h263_decode_mba(s);
-
- if (get_bits1(&s->gb) != 1) {
- av_log(s->avctx, AV_LOG_ERROR, "SEPB2 marker missing\n");
- return -1;
- }
- }
- s->f_code = 1;
-
- if(s->h263_aic){
- s->y_dc_scale_table=
- s->c_dc_scale_table= ff_aic_dc_scale_table;
- }else{
- s->y_dc_scale_table=
- s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
- }
-
- if(s->avctx->debug&FF_DEBUG_PICT_INFO){
- show_pict_info(s);
- }
-#if 1
- if (s->pict_type == FF_I_TYPE && s->codec_tag == ff_get_fourcc("ZYGO")){
- int i,j;
- for(i=0; i<85; i++) av_log(s->avctx, AV_LOG_DEBUG, "%d", get_bits1(&s->gb));
- av_log(s->avctx, AV_LOG_DEBUG, "\n");
- for(i=0; i<13; i++){
- for(j=0; j<3; j++){
- int v= get_bits(&s->gb, 8);
- v |= get_sbits(&s->gb, 8)<<8;
- av_log(s->avctx, AV_LOG_DEBUG, " %5d", v);
- }
- av_log(s->avctx, AV_LOG_DEBUG, "\n");
- }
- for(i=0; i<50; i++) av_log(s->avctx, AV_LOG_DEBUG, "%d", get_bits1(&s->gb));
- }
-#endif
-
- return 0;
-}
-
-static void mpeg4_decode_sprite_trajectory(MpegEncContext * s, GetBitContext *gb)
-{
- int i;
- int a= 2<<s->sprite_warping_accuracy;
- int rho= 3-s->sprite_warping_accuracy;
- int r=16/a;
- const int vop_ref[4][2]= {{0,0}, {s->width,0}, {0, s->height}, {s->width, s->height}}; // only true for rectangle shapes
- int d[4][2]={{0,0}, {0,0}, {0,0}, {0,0}};
- int sprite_ref[4][2];
- int virtual_ref[2][2];
- int w2, h2, w3, h3;
- int alpha=0, beta=0;
- int w= s->width;
- int h= s->height;
- int min_ab;
-
- for(i=0; i<s->num_sprite_warping_points; i++){
- int length;
- int x=0, y=0;
-
- length= get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
- if(length){
- x= get_xbits(gb, length);
- }
- if(!(s->divx_version==500 && s->divx_build==413)) skip_bits1(gb); /* marker bit */
-
- length= get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
- if(length){
- y=get_xbits(gb, length);
- }
- skip_bits1(gb); /* marker bit */
-//printf("%d %d %d %d\n", x, y, i, s->sprite_warping_accuracy);
- d[i][0]= x;
- d[i][1]= y;
- }
-
- while((1<<alpha)<w) alpha++;
- while((1<<beta )<h) beta++; // there seems to be a typo in the mpeg4 std for the definition of w' and h'
- w2= 1<<alpha;
- h2= 1<<beta;
-
-// Note, the 4th point isn't used for GMC
- if(s->divx_version==500 && s->divx_build==413){
- sprite_ref[0][0]= a*vop_ref[0][0] + d[0][0];
- sprite_ref[0][1]= a*vop_ref[0][1] + d[0][1];
- sprite_ref[1][0]= a*vop_ref[1][0] + d[0][0] + d[1][0];
- sprite_ref[1][1]= a*vop_ref[1][1] + d[0][1] + d[1][1];
- sprite_ref[2][0]= a*vop_ref[2][0] + d[0][0] + d[2][0];
- sprite_ref[2][1]= a*vop_ref[2][1] + d[0][1] + d[2][1];
- } else {
- sprite_ref[0][0]= (a>>1)*(2*vop_ref[0][0] + d[0][0]);
- sprite_ref[0][1]= (a>>1)*(2*vop_ref[0][1] + d[0][1]);
- sprite_ref[1][0]= (a>>1)*(2*vop_ref[1][0] + d[0][0] + d[1][0]);
- sprite_ref[1][1]= (a>>1)*(2*vop_ref[1][1] + d[0][1] + d[1][1]);
- sprite_ref[2][0]= (a>>1)*(2*vop_ref[2][0] + d[0][0] + d[2][0]);
- sprite_ref[2][1]= (a>>1)*(2*vop_ref[2][1] + d[0][1] + d[2][1]);
- }
-/* sprite_ref[3][0]= (a>>1)*(2*vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
- sprite_ref[3][1]= (a>>1)*(2*vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */
-
-// this is mostly identical to the mpeg4 std (and is totally unreadable because of that ...)
-// perhaps it should be reordered to be more readable ...
-// the idea behind this virtual_ref mess is to be able to use shifts later per pixel instead of divides
-// so the distance between points is converted from w&h based to w2&h2 based which are of the 2^x form
- virtual_ref[0][0]= 16*(vop_ref[0][0] + w2)
- + ROUNDED_DIV(((w - w2)*(r*sprite_ref[0][0] - 16*vop_ref[0][0]) + w2*(r*sprite_ref[1][0] - 16*vop_ref[1][0])),w);
- virtual_ref[0][1]= 16*vop_ref[0][1]
- + ROUNDED_DIV(((w - w2)*(r*sprite_ref[0][1] - 16*vop_ref[0][1]) + w2*(r*sprite_ref[1][1] - 16*vop_ref[1][1])),w);
- virtual_ref[1][0]= 16*vop_ref[0][0]
- + ROUNDED_DIV(((h - h2)*(r*sprite_ref[0][0] - 16*vop_ref[0][0]) + h2*(r*sprite_ref[2][0] - 16*vop_ref[2][0])),h);
- virtual_ref[1][1]= 16*(vop_ref[0][1] + h2)
- + ROUNDED_DIV(((h - h2)*(r*sprite_ref[0][1] - 16*vop_ref[0][1]) + h2*(r*sprite_ref[2][1] - 16*vop_ref[2][1])),h);
-
- switch(s->num_sprite_warping_points)
- {
- case 0:
- s->sprite_offset[0][0]= 0;
- s->sprite_offset[0][1]= 0;
- s->sprite_offset[1][0]= 0;
- s->sprite_offset[1][1]= 0;
- s->sprite_delta[0][0]= a;
- s->sprite_delta[0][1]= 0;
- s->sprite_delta[1][0]= 0;
- s->sprite_delta[1][1]= a;
- s->sprite_shift[0]= 0;
- s->sprite_shift[1]= 0;
- break;
- case 1: //GMC only
- s->sprite_offset[0][0]= sprite_ref[0][0] - a*vop_ref[0][0];
- s->sprite_offset[0][1]= sprite_ref[0][1] - a*vop_ref[0][1];
- s->sprite_offset[1][0]= ((sprite_ref[0][0]>>1)|(sprite_ref[0][0]&1)) - a*(vop_ref[0][0]/2);
- s->sprite_offset[1][1]= ((sprite_ref[0][1]>>1)|(sprite_ref[0][1]&1)) - a*(vop_ref[0][1]/2);
- s->sprite_delta[0][0]= a;
- s->sprite_delta[0][1]= 0;
- s->sprite_delta[1][0]= 0;
- s->sprite_delta[1][1]= a;
- s->sprite_shift[0]= 0;
- s->sprite_shift[1]= 0;
- break;
- case 2:
- s->sprite_offset[0][0]= (sprite_ref[0][0]<<(alpha+rho))
- + (-r*sprite_ref[0][0] + virtual_ref[0][0])*(-vop_ref[0][0])
- + ( r*sprite_ref[0][1] - virtual_ref[0][1])*(-vop_ref[0][1])
- + (1<<(alpha+rho-1));
- s->sprite_offset[0][1]= (sprite_ref[0][1]<<(alpha+rho))
- + (-r*sprite_ref[0][1] + virtual_ref[0][1])*(-vop_ref[0][0])
- + (-r*sprite_ref[0][0] + virtual_ref[0][0])*(-vop_ref[0][1])
- + (1<<(alpha+rho-1));
- s->sprite_offset[1][0]= ( (-r*sprite_ref[0][0] + virtual_ref[0][0])*(-2*vop_ref[0][0] + 1)
- +( r*sprite_ref[0][1] - virtual_ref[0][1])*(-2*vop_ref[0][1] + 1)
- +2*w2*r*sprite_ref[0][0]
- - 16*w2
- + (1<<(alpha+rho+1)));
- s->sprite_offset[1][1]= ( (-r*sprite_ref[0][1] + virtual_ref[0][1])*(-2*vop_ref[0][0] + 1)
- +(-r*sprite_ref[0][0] + virtual_ref[0][0])*(-2*vop_ref[0][1] + 1)
- +2*w2*r*sprite_ref[0][1]
- - 16*w2
- + (1<<(alpha+rho+1)));
- s->sprite_delta[0][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0]);
- s->sprite_delta[0][1]= (+r*sprite_ref[0][1] - virtual_ref[0][1]);
- s->sprite_delta[1][0]= (-r*sprite_ref[0][1] + virtual_ref[0][1]);
- s->sprite_delta[1][1]= (-r*sprite_ref[0][0] + virtual_ref[0][0]);
-
- s->sprite_shift[0]= alpha+rho;
- s->sprite_shift[1]= alpha+rho+2;
- break;
- case 3:
- min_ab= FFMIN(alpha, beta);
- w3= w2>>min_ab;
- h3= h2>>min_ab;
- s->sprite_offset[0][0]= (sprite_ref[0][0]<<(alpha+beta+rho-min_ab))
- + (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3*(-vop_ref[0][0])
- + (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3*(-vop_ref[0][1])
- + (1<<(alpha+beta+rho-min_ab-1));
- s->sprite_offset[0][1]= (sprite_ref[0][1]<<(alpha+beta+rho-min_ab))
- + (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3*(-vop_ref[0][0])
- + (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3*(-vop_ref[0][1])
- + (1<<(alpha+beta+rho-min_ab-1));
- s->sprite_offset[1][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3*(-2*vop_ref[0][0] + 1)
- + (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3*(-2*vop_ref[0][1] + 1)
- + 2*w2*h3*r*sprite_ref[0][0]
- - 16*w2*h3
- + (1<<(alpha+beta+rho-min_ab+1));
- s->sprite_offset[1][1]= (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3*(-2*vop_ref[0][0] + 1)
- + (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3*(-2*vop_ref[0][1] + 1)
- + 2*w2*h3*r*sprite_ref[0][1]
- - 16*w2*h3
- + (1<<(alpha+beta+rho-min_ab+1));
- s->sprite_delta[0][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3;
- s->sprite_delta[0][1]= (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3;
- s->sprite_delta[1][0]= (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3;
- s->sprite_delta[1][1]= (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3;
-
- s->sprite_shift[0]= alpha + beta + rho - min_ab;
- s->sprite_shift[1]= alpha + beta + rho - min_ab + 2;
- break;
- }
- /* try to simplify the situation */
- if( s->sprite_delta[0][0] == a<<s->sprite_shift[0]
- && s->sprite_delta[0][1] == 0
- && s->sprite_delta[1][0] == 0
- && s->sprite_delta[1][1] == a<<s->sprite_shift[0])
- {
- s->sprite_offset[0][0]>>=s->sprite_shift[0];
- s->sprite_offset[0][1]>>=s->sprite_shift[0];
- s->sprite_offset[1][0]>>=s->sprite_shift[1];
- s->sprite_offset[1][1]>>=s->sprite_shift[1];
- s->sprite_delta[0][0]= a;
- s->sprite_delta[0][1]= 0;
- s->sprite_delta[1][0]= 0;
- s->sprite_delta[1][1]= a;
- s->sprite_shift[0]= 0;
- s->sprite_shift[1]= 0;
- s->real_sprite_warping_points=1;
- }
- else{
- int shift_y= 16 - s->sprite_shift[0];
- int shift_c= 16 - s->sprite_shift[1];
-//printf("shifts %d %d\n", shift_y, shift_c);
- for(i=0; i<2; i++){
- s->sprite_offset[0][i]<<= shift_y;
- s->sprite_offset[1][i]<<= shift_c;
- s->sprite_delta[0][i]<<= shift_y;
- s->sprite_delta[1][i]<<= shift_y;
- s->sprite_shift[i]= 16;
- }
- s->real_sprite_warping_points= s->num_sprite_warping_points;
- }
-#if 0
-printf("vop:%d:%d %d:%d %d:%d, sprite:%d:%d %d:%d %d:%d, virtual: %d:%d %d:%d\n",
- vop_ref[0][0], vop_ref[0][1],
- vop_ref[1][0], vop_ref[1][1],
- vop_ref[2][0], vop_ref[2][1],
- sprite_ref[0][0], sprite_ref[0][1],
- sprite_ref[1][0], sprite_ref[1][1],
- sprite_ref[2][0], sprite_ref[2][1],
- virtual_ref[0][0], virtual_ref[0][1],
- virtual_ref[1][0], virtual_ref[1][1]
- );
-
-printf("offset: %d:%d , delta: %d %d %d %d, shift %d\n",
- s->sprite_offset[0][0], s->sprite_offset[0][1],
- s->sprite_delta[0][0], s->sprite_delta[0][1],
- s->sprite_delta[1][0], s->sprite_delta[1][1],
- s->sprite_shift[0]
- );
-#endif
-}
-
-static int mpeg4_decode_gop_header(MpegEncContext * s, GetBitContext *gb){
- int hours, minutes, seconds;
-
- hours= get_bits(gb, 5);
- minutes= get_bits(gb, 6);
- skip_bits1(gb);
- seconds= get_bits(gb, 6);
-
- s->time_base= seconds + 60*(minutes + 60*hours);
-
- skip_bits1(gb);
- skip_bits1(gb);
-
- return 0;
-}
-
-static int decode_vol_header(MpegEncContext *s, GetBitContext *gb){
- int width, height, vo_ver_id;
-
- /* vol header */
- skip_bits(gb, 1); /* random access */
- s->vo_type= get_bits(gb, 8);
- if (get_bits1(gb) != 0) { /* is_ol_id */
- vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
- skip_bits(gb, 3); /* vo_priority */
- } else {
- vo_ver_id = 1;
- }
-//printf("vo type:%d\n",s->vo_type);
- s->aspect_ratio_info= get_bits(gb, 4);
- if(s->aspect_ratio_info == FF_ASPECT_EXTENDED){
- s->avctx->sample_aspect_ratio.num= get_bits(gb, 8); // par_width
- s->avctx->sample_aspect_ratio.den= get_bits(gb, 8); // par_height
- }else{
- s->avctx->sample_aspect_ratio= pixel_aspect[s->aspect_ratio_info];
- }
-
- if ((s->vol_control_parameters=get_bits1(gb))) { /* vol control parameter */
- int chroma_format= get_bits(gb, 2);
- if(chroma_format!=1){
- av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
- }
- s->low_delay= get_bits1(gb);
- if(get_bits1(gb)){ /* vbv parameters */
- get_bits(gb, 15); /* first_half_bitrate */
- skip_bits1(gb); /* marker */
- get_bits(gb, 15); /* latter_half_bitrate */
- skip_bits1(gb); /* marker */
- get_bits(gb, 15); /* first_half_vbv_buffer_size */
- skip_bits1(gb); /* marker */
- get_bits(gb, 3); /* latter_half_vbv_buffer_size */
- get_bits(gb, 11); /* first_half_vbv_occupancy */
- skip_bits1(gb); /* marker */
- get_bits(gb, 15); /* latter_half_vbv_occupancy */
- skip_bits1(gb); /* marker */
- }
- }else{
- // set low delay flag only once the smartest? low delay detection won't be overriden
- if(s->picture_number==0)
- s->low_delay=0;
- }
-
- s->shape = get_bits(gb, 2); /* vol shape */
- if(s->shape != RECT_SHAPE) av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
- if(s->shape == GRAY_SHAPE && vo_ver_id != 1){
- av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
- skip_bits(gb, 4); //video_object_layer_shape_extension
- }
-
- check_marker(gb, "before time_increment_resolution");
-
- s->avctx->time_base.den = get_bits(gb, 16);
- if(!s->avctx->time_base.den){
- av_log(s->avctx, AV_LOG_ERROR, "time_base.den==0\n");
- return -1;
- }
-
- s->time_increment_bits = av_log2(s->avctx->time_base.den - 1) + 1;
- if (s->time_increment_bits < 1)
- s->time_increment_bits = 1;
-
- check_marker(gb, "before fixed_vop_rate");
-
- if (get_bits1(gb) != 0) { /* fixed_vop_rate */
- s->avctx->time_base.num = get_bits(gb, s->time_increment_bits);
- }else
- s->avctx->time_base.num = 1;
-
- s->t_frame=0;
-
- if (s->shape != BIN_ONLY_SHAPE) {
- if (s->shape == RECT_SHAPE) {
- skip_bits1(gb); /* marker */
- width = get_bits(gb, 13);
- skip_bits1(gb); /* marker */
- height = get_bits(gb, 13);
- skip_bits1(gb); /* marker */
- if(width && height && !(s->width && s->codec_tag == ff_get_fourcc("MP4S"))){ /* they should be non zero but who knows ... */
- s->width = width;
- s->height = height;
-// printf("width/height: %d %d\n", width, height);
- }
- }
-
- s->progressive_sequence=
- s->progressive_frame= get_bits1(gb)^1;
- s->interlaced_dct=0;
- if(!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
- av_log(s->avctx, AV_LOG_INFO, "MPEG4 OBMC not supported (very likely buggy encoder)\n"); /* OBMC Disable */
- if (vo_ver_id == 1) {
- s->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
- } else {
- s->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
- }
- if(s->vol_sprite_usage==STATIC_SPRITE) av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
- if(s->vol_sprite_usage==STATIC_SPRITE || s->vol_sprite_usage==GMC_SPRITE){
- if(s->vol_sprite_usage==STATIC_SPRITE){
- s->sprite_width = get_bits(gb, 13);
- skip_bits1(gb); /* marker */
- s->sprite_height= get_bits(gb, 13);
- skip_bits1(gb); /* marker */
- s->sprite_left = get_bits(gb, 13);
- skip_bits1(gb); /* marker */
- s->sprite_top = get_bits(gb, 13);
- skip_bits1(gb); /* marker */
- }
- s->num_sprite_warping_points= get_bits(gb, 6);
- if(s->num_sprite_warping_points > 3){
- av_log(s->avctx, AV_LOG_ERROR, "%d sprite_warping_points\n", s->num_sprite_warping_points);
- s->num_sprite_warping_points= 0;
- return -1;
- }
- s->sprite_warping_accuracy = get_bits(gb, 2);
- s->sprite_brightness_change= get_bits1(gb);
- if(s->vol_sprite_usage==STATIC_SPRITE)
- s->low_latency_sprite= get_bits1(gb);
- }
- // FIXME sadct disable bit if verid!=1 && shape not rect
-
- if (get_bits1(gb) == 1) { /* not_8_bit */
- s->quant_precision = get_bits(gb, 4); /* quant_precision */
- if(get_bits(gb, 4)!=8) av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n"); /* bits_per_pixel */
- if(s->quant_precision!=5) av_log(s->avctx, AV_LOG_ERROR, "quant precision %d\n", s->quant_precision);
- } else {
- s->quant_precision = 5;
- }
-
- // FIXME a bunch of grayscale shape things
-
- if((s->mpeg_quant=get_bits1(gb))){ /* vol_quant_type */
- int i, v;
-
- /* load default matrixes */
- for(i=0; i<64; i++){
- int j= s->dsp.idct_permutation[i];
- v= ff_mpeg4_default_intra_matrix[i];
- s->intra_matrix[j]= v;
- s->chroma_intra_matrix[j]= v;
-
- v= ff_mpeg4_default_non_intra_matrix[i];
- s->inter_matrix[j]= v;
- s->chroma_inter_matrix[j]= v;
- }
-
- /* load custom intra matrix */
- if(get_bits1(gb)){
- int last=0;
- for(i=0; i<64; i++){
- int j;
- v= get_bits(gb, 8);
- if(v==0) break;
-
- last= v;
- j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
- s->intra_matrix[j]= v;
- s->chroma_intra_matrix[j]= v;
- }
-
- /* replicate last value */
- for(; i<64; i++){
- int j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
- s->intra_matrix[j]= last;
- s->chroma_intra_matrix[j]= last;
- }
- }
-
- /* load custom non intra matrix */
- if(get_bits1(gb)){
- int last=0;
- for(i=0; i<64; i++){
- int j;
- v= get_bits(gb, 8);
- if(v==0) break;
-
- last= v;
- j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
- s->inter_matrix[j]= v;
- s->chroma_inter_matrix[j]= v;
- }
-
- /* replicate last value */
- for(; i<64; i++){
- int j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
- s->inter_matrix[j]= last;
- s->chroma_inter_matrix[j]= last;
- }
- }
-
- // FIXME a bunch of grayscale shape things
- }
-
- if(vo_ver_id != 1)
- s->quarter_sample= get_bits1(gb);
- else s->quarter_sample=0;
-
- if(!get_bits1(gb)) av_log(s->avctx, AV_LOG_ERROR, "Complexity estimation not supported\n");
-
- s->resync_marker= !get_bits1(gb); /* resync_marker_disabled */
-
- s->data_partitioning= get_bits1(gb);
- if(s->data_partitioning){
- s->rvlc= get_bits1(gb);
- }
-
- if(vo_ver_id != 1) {
- s->new_pred= get_bits1(gb);
- if(s->new_pred){
- av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
- skip_bits(gb, 2); /* requested upstream message type */
- skip_bits1(gb); /* newpred segment type */
- }
- s->reduced_res_vop= get_bits1(gb);
- if(s->reduced_res_vop) av_log(s->avctx, AV_LOG_ERROR, "reduced resolution VOP not supported\n");
- }
- else{
- s->new_pred=0;
- s->reduced_res_vop= 0;
- }
-
- s->scalability= get_bits1(gb);
-
- if (s->scalability) {
- GetBitContext bak= *gb;
- int ref_layer_id;
- int ref_layer_sampling_dir;
- int h_sampling_factor_n;
- int h_sampling_factor_m;
- int v_sampling_factor_n;
- int v_sampling_factor_m;
-
- s->hierachy_type= get_bits1(gb);
- ref_layer_id= get_bits(gb, 4);
- ref_layer_sampling_dir= get_bits1(gb);
- h_sampling_factor_n= get_bits(gb, 5);
- h_sampling_factor_m= get_bits(gb, 5);
- v_sampling_factor_n= get_bits(gb, 5);
- v_sampling_factor_m= get_bits(gb, 5);
- s->enhancement_type= get_bits1(gb);
-
- if( h_sampling_factor_n==0 || h_sampling_factor_m==0
- || v_sampling_factor_n==0 || v_sampling_factor_m==0){
-
-// fprintf(stderr, "illegal scalability header (VERY broken encoder), trying to workaround\n");
- s->scalability=0;
-
- *gb= bak;
- }else
- av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
-
- // bin shape stuff FIXME
- }
- }
- return 0;
-}
-
-/**
- * decodes the user data stuff in the header.
- * allso inits divx/xvid/lavc_version/build
- */
-static int decode_user_data(MpegEncContext *s, GetBitContext *gb){
- char buf[256];
- int i;
- int e;
- int ver = 0, build = 0, ver2 = 0, ver3 = 0;
- char last;
-
- for(i=0; i<255 && get_bits_count(gb) < gb->size_in_bits; i++){
- if(show_bits(gb, 23) == 0) break;
- buf[i]= get_bits(gb, 8);
- }
- buf[i]=0;
-
- /* divx detection */
- e=sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
- if(e<2)
- e=sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
- if(e>=2){
- s->divx_version= ver;
- s->divx_build= build;
- s->divx_packed= e==3 && last=='p';
- }
-
- /* ffmpeg detection */
- e=sscanf(buf, "FFmpe%*[^b]b%d", &build)+3;
- if(e!=4)
- e=sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
- if(e!=4){
- e=sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3)+1;
- if (e>1)
- build= (ver<<16) + (ver2<<8) + ver3;
- }
- if(e!=4){
- if(strcmp(buf, "ffmpeg")==0){
- s->lavc_build= 4600;
- }
- }
- if(e==4){
- s->lavc_build= build;
- }
-
- /* xvid detection */
- e=sscanf(buf, "XviD%d", &build);
- if(e==1){
- s->xvid_build= build;
- }
-
-//printf("User Data: %s\n", buf);
- return 0;
-}
-
-static int decode_vop_header(MpegEncContext *s, GetBitContext *gb){
- int time_incr, time_increment;
-
- s->pict_type = get_bits(gb, 2) + FF_I_TYPE; /* pict type: I = 0 , P = 1 */
- if(s->pict_type==FF_B_TYPE && s->low_delay && s->vol_control_parameters==0 && !(s->flags & CODEC_FLAG_LOW_DELAY)){
- av_log(s->avctx, AV_LOG_ERROR, "low_delay flag incorrectly, clearing it\n");
- s->low_delay=0;
- }
-
- s->partitioned_frame= s->data_partitioning && s->pict_type!=FF_B_TYPE;
- if(s->partitioned_frame)
- s->decode_mb= mpeg4_decode_partitioned_mb;
- else
- s->decode_mb= ff_mpeg4_decode_mb;
-
- time_incr=0;
- while (get_bits1(gb) != 0)
- time_incr++;
-
- check_marker(gb, "before time_increment");
-
- if(s->time_increment_bits==0 || !(show_bits(gb, s->time_increment_bits+1)&1)){
- av_log(s->avctx, AV_LOG_ERROR, "hmm, seems the headers are not complete, trying to guess time_increment_bits\n");
-
- for(s->time_increment_bits=1 ;s->time_increment_bits<16; s->time_increment_bits++){
- if(show_bits(gb, s->time_increment_bits+1)&1) break;
- }
-
- av_log(s->avctx, AV_LOG_ERROR, "my guess is %d bits ;)\n",s->time_increment_bits);
- }
-
- if(IS_3IV1) time_increment= get_bits1(gb); //FIXME investigate further
- else time_increment= get_bits(gb, s->time_increment_bits);
-
-// printf("%d %X\n", s->time_increment_bits, time_increment);
-//av_log(s->avctx, AV_LOG_DEBUG, " type:%d modulo_time_base:%d increment:%d t_frame %d\n", s->pict_type, time_incr, time_increment, s->t_frame);
- if(s->pict_type!=FF_B_TYPE){
- s->last_time_base= s->time_base;
- s->time_base+= time_incr;
- s->time= s->time_base*s->avctx->time_base.den + time_increment;
- if(s->workaround_bugs&FF_BUG_UMP4){
- if(s->time < s->last_non_b_time){
-// fprintf(stderr, "header is not mpeg4 compatible, broken encoder, trying to workaround\n");
- s->time_base++;
- s->time+= s->avctx->time_base.den;
- }
- }
- s->pp_time= s->time - s->last_non_b_time;
- s->last_non_b_time= s->time;
- }else{
- s->time= (s->last_time_base + time_incr)*s->avctx->time_base.den + time_increment;
- s->pb_time= s->pp_time - (s->last_non_b_time - s->time);
- if(s->pp_time <=s->pb_time || s->pp_time <= s->pp_time - s->pb_time || s->pp_time<=0){
-// printf("messed up order, maybe after seeking? skipping current b frame\n");
- return FRAME_SKIPPED;
- }
- ff_mpeg4_init_direct_mv(s);
-
- if(s->t_frame==0) s->t_frame= s->pb_time;
- if(s->t_frame==0) s->t_frame=1; // 1/0 protection
- s->pp_field_time= ( ROUNDED_DIV(s->last_non_b_time, s->t_frame)
- - ROUNDED_DIV(s->last_non_b_time - s->pp_time, s->t_frame))*2;
- s->pb_field_time= ( ROUNDED_DIV(s->time, s->t_frame)
- - ROUNDED_DIV(s->last_non_b_time - s->pp_time, s->t_frame))*2;
- if(!s->progressive_sequence){
- if(s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1)
- return FRAME_SKIPPED;
- }
- }
-//av_log(s->avctx, AV_LOG_DEBUG, "last nonb %"PRId64" last_base %d time %"PRId64" pp %d pb %d t %d ppf %d pbf %d\n", s->last_non_b_time, s->last_time_base, s->time, s->pp_time, s->pb_time, s->t_frame, s->pp_field_time, s->pb_field_time);
-
- if(s->avctx->time_base.num)
- s->current_picture_ptr->pts= (s->time + s->avctx->time_base.num/2) / s->avctx->time_base.num;
- else
- s->current_picture_ptr->pts= AV_NOPTS_VALUE;
- if(s->avctx->debug&FF_DEBUG_PTS)
- av_log(s->avctx, AV_LOG_DEBUG, "MPEG4 PTS: %"PRId64"\n", s->current_picture_ptr->pts);
-
- check_marker(gb, "before vop_coded");
-
- /* vop coded */
- if (get_bits1(gb) != 1){
- if(s->avctx->debug&FF_DEBUG_PICT_INFO)
- av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
- return FRAME_SKIPPED;
- }
-//printf("time %d %d %d || %"PRId64" %"PRId64" %"PRId64"\n", s->time_increment_bits, s->avctx->time_base.den, s->time_base,
-//s->time, s->last_non_b_time, s->last_non_b_time - s->pp_time);
- if (s->shape != BIN_ONLY_SHAPE && ( s->pict_type == FF_P_TYPE
- || (s->pict_type == FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE))) {
- /* rounding type for motion estimation */
- s->no_rounding = get_bits1(gb);
- } else {
- s->no_rounding = 0;
- }
-//FIXME reduced res stuff
-
- if (s->shape != RECT_SHAPE) {
- if (s->vol_sprite_usage != 1 || s->pict_type != FF_I_TYPE) {
- int width, height, hor_spat_ref, ver_spat_ref;
-
- width = get_bits(gb, 13);
- skip_bits1(gb); /* marker */
- height = get_bits(gb, 13);
- skip_bits1(gb); /* marker */
- hor_spat_ref = get_bits(gb, 13); /* hor_spat_ref */
- skip_bits1(gb); /* marker */
- ver_spat_ref = get_bits(gb, 13); /* ver_spat_ref */
- }
- skip_bits1(gb); /* change_CR_disable */
-
- if (get_bits1(gb) != 0) {
- skip_bits(gb, 8); /* constant_alpha_value */
- }
- }
-//FIXME complexity estimation stuff
-
- if (s->shape != BIN_ONLY_SHAPE) {
- s->intra_dc_threshold= mpeg4_dc_threshold[ get_bits(gb, 3) ];
- if(!s->progressive_sequence){
- s->top_field_first= get_bits1(gb);
- s->alternate_scan= get_bits1(gb);
- }else
- s->alternate_scan= 0;
- }
-
- if(s->alternate_scan){
- ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_alternate_vertical_scan);
- ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_alternate_vertical_scan);
- ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
- ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
- } else{
- ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_zigzag_direct);
- ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_zigzag_direct);
- ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
- ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
- }
-
- if(s->pict_type == FF_S_TYPE && (s->vol_sprite_usage==STATIC_SPRITE || s->vol_sprite_usage==GMC_SPRITE)){
- mpeg4_decode_sprite_trajectory(s, gb);
- if(s->sprite_brightness_change) av_log(s->avctx, AV_LOG_ERROR, "sprite_brightness_change not supported\n");
- if(s->vol_sprite_usage==STATIC_SPRITE) av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
- }
-
- if (s->shape != BIN_ONLY_SHAPE) {
- s->chroma_qscale= s->qscale = get_bits(gb, s->quant_precision);
- if(s->qscale==0){
- av_log(s->avctx, AV_LOG_ERROR, "Error, header damaged or not MPEG4 header (qscale=0)\n");
- return -1; // makes no sense to continue, as there is nothing left from the image then
- }
-
- if (s->pict_type != FF_I_TYPE) {
- s->f_code = get_bits(gb, 3); /* fcode_for */
- if(s->f_code==0){
- av_log(s->avctx, AV_LOG_ERROR, "Error, header damaged or not MPEG4 header (f_code=0)\n");
- return -1; // makes no sense to continue, as the MV decoding will break very quickly
- }
- }else
- s->f_code=1;
-
- if (s->pict_type == FF_B_TYPE) {
- s->b_code = get_bits(gb, 3);
- }else
- s->b_code=1;
-
- if(s->avctx->debug&FF_DEBUG_PICT_INFO){
- av_log(s->avctx, AV_LOG_DEBUG, "qp:%d fc:%d,%d %s size:%d pro:%d alt:%d top:%d %spel part:%d resync:%d w:%d a:%d rnd:%d vot:%d%s dc:%d\n",
- s->qscale, s->f_code, s->b_code,
- s->pict_type == FF_I_TYPE ? "I" : (s->pict_type == FF_P_TYPE ? "P" : (s->pict_type == FF_B_TYPE ? "B" : "S")),
- gb->size_in_bits,s->progressive_sequence, s->alternate_scan, s->top_field_first,
- s->quarter_sample ? "q" : "h", s->data_partitioning, s->resync_marker, s->num_sprite_warping_points,
- s->sprite_warping_accuracy, 1-s->no_rounding, s->vo_type, s->vol_control_parameters ? " VOLC" : " ", s->intra_dc_threshold);
- }
-
- if(!s->scalability){
- if (s->shape!=RECT_SHAPE && s->pict_type!=FF_I_TYPE) {
- skip_bits1(gb); // vop shape coding type
- }
- }else{
- if(s->enhancement_type){
- int load_backward_shape= get_bits1(gb);
- if(load_backward_shape){
- av_log(s->avctx, AV_LOG_ERROR, "load backward shape isn't supported\n");
- }
- }
- skip_bits(gb, 2); //ref_select_code
- }
- }
- /* detect buggy encoders which don't set the low_delay flag (divx4/xvid/opendivx)*/
- // note we cannot detect divx5 without b-frames easily (although it's buggy too)
- if(s->vo_type==0 && s->vol_control_parameters==0 && s->divx_version==0 && s->picture_number==0){
- av_log(s->avctx, AV_LOG_ERROR, "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
- s->low_delay=1;
- }
-
- s->picture_number++; // better than pic number==0 always ;)
-
- s->y_dc_scale_table= ff_mpeg4_y_dc_scale_table; //FIXME add short header support
- s->c_dc_scale_table= ff_mpeg4_c_dc_scale_table;
-
- if(s->workaround_bugs&FF_BUG_EDGE){
- s->h_edge_pos= s->width;
- s->v_edge_pos= s->height;
- }
- return 0;
-}
-
-/**
- * decode mpeg4 headers
- * @return <0 if no VOP found (or a damaged one)
- * FRAME_SKIPPED if a not coded VOP is found
- * 0 if a VOP is found
- */
-int ff_mpeg4_decode_picture_header(MpegEncContext * s, GetBitContext *gb)
-{
- int startcode, v;
-
- /* search next start code */
- align_get_bits(gb);
-
- if(s->codec_tag == ff_get_fourcc("WV1F") && show_bits(gb, 24) == 0x575630){
- skip_bits(gb, 24);
- if(get_bits(gb, 8) == 0xF0)
- return decode_vop_header(s, gb);
- }
-
- startcode = 0xff;
- for(;;) {
- if(get_bits_count(gb) >= gb->size_in_bits){
- if(gb->size_in_bits==8 && (s->divx_version || s->xvid_build)){
- av_log(s->avctx, AV_LOG_ERROR, "frame skip %d\n", gb->size_in_bits);
- return FRAME_SKIPPED; //divx bug
- }else
- return -1; //end of stream
- }
-
- /* use the bits after the test */
- v = get_bits(gb, 8);
- startcode = ((startcode << 8) | v) & 0xffffffff;
-
- if((startcode&0xFFFFFF00) != 0x100)
- continue; //no startcode
-
- if(s->avctx->debug&FF_DEBUG_STARTCODE){
- av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
- if (startcode<=0x11F) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
- else if(startcode<=0x12F) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
- else if(startcode<=0x13F) av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
- else if(startcode<=0x15F) av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
- else if(startcode<=0x1AF) av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
- else if(startcode==0x1B0) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
- else if(startcode==0x1B1) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
- else if(startcode==0x1B2) av_log(s->avctx, AV_LOG_DEBUG, "User Data");
- else if(startcode==0x1B3) av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
- else if(startcode==0x1B4) av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
- else if(startcode==0x1B5) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
- else if(startcode==0x1B6) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
- else if(startcode==0x1B7) av_log(s->avctx, AV_LOG_DEBUG, "slice start");
- else if(startcode==0x1B8) av_log(s->avctx, AV_LOG_DEBUG, "extension start");
- else if(startcode==0x1B9) av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
- else if(startcode==0x1BA) av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
- else if(startcode==0x1BB) av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
- else if(startcode==0x1BC) av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
- else if(startcode==0x1BD) av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
- else if(startcode==0x1BE) av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
- else if(startcode==0x1BF) av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
- else if(startcode==0x1C0) av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
- else if(startcode==0x1C1) av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
- else if(startcode==0x1C2) av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
- else if(startcode==0x1C3) av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
- else if(startcode<=0x1C5) av_log(s->avctx, AV_LOG_DEBUG, "reserved");
- else if(startcode<=0x1FF) av_log(s->avctx, AV_LOG_DEBUG, "System start");
- av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
- }
-
- if(startcode >= 0x120 && startcode <= 0x12F){
- if(decode_vol_header(s, gb) < 0)
- return -1;
- }
- else if(startcode == USER_DATA_STARTCODE){
- decode_user_data(s, gb);
- }
- else if(startcode == GOP_STARTCODE){
- mpeg4_decode_gop_header(s, gb);
- }
- else if(startcode == VOP_STARTCODE){
- return decode_vop_header(s, gb);
- }
-
- align_get_bits(gb);
- startcode = 0xff;
- }
-}
-
-/* don't understand why they choose a different header ! */
-int intel_h263_decode_picture_header(MpegEncContext *s)
-{
- int format;
-
- /* picture header */
- if (get_bits_long(&s->gb, 22) != 0x20) {
- av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n");
- return -1;
- }
- s->picture_number = get_bits(&s->gb, 8); /* picture timestamp */
-
- if (get_bits1(&s->gb) != 1) {
- av_log(s->avctx, AV_LOG_ERROR, "Bad marker\n");
- return -1; /* marker */
- }
- if (get_bits1(&s->gb) != 0) {
- av_log(s->avctx, AV_LOG_ERROR, "Bad H263 id\n");
- return -1; /* h263 id */
- }
- skip_bits1(&s->gb); /* split screen off */
- skip_bits1(&s->gb); /* camera off */
- skip_bits1(&s->gb); /* freeze picture release off */
-
- format = get_bits(&s->gb, 3);
- if (format != 7) {
- av_log(s->avctx, AV_LOG_ERROR, "Intel H263 free format not supported\n");
- return -1;
- }
- s->h263_plus = 0;
-
- s->pict_type = FF_I_TYPE + get_bits1(&s->gb);
-
- s->unrestricted_mv = get_bits1(&s->gb);
- s->h263_long_vectors = s->unrestricted_mv;
-
- if (get_bits1(&s->gb) != 0) {
- av_log(s->avctx, AV_LOG_ERROR, "SAC not supported\n");
- return -1; /* SAC: off */
- }
- s->obmc= get_bits1(&s->gb);
- if (get_bits1(&s->gb) != 0) {
- av_log(s->avctx, AV_LOG_ERROR, "PB frame mode no supported\n");
- return -1; /* PB frame mode */
- }
-
- /* skip unknown header garbage */
- skip_bits(&s->gb, 41);
-
- s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
- skip_bits1(&s->gb); /* Continuous Presence Multipoint mode: off */
-
- /* PEI */
- while (get_bits1(&s->gb) != 0) {
- skip_bits(&s->gb, 8);
- }
- s->f_code = 1;
-
- s->y_dc_scale_table=
- s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
-
- if(s->avctx->debug&FF_DEBUG_PICT_INFO)
- show_pict_info(s);
-
- return 0;
-}
-
-int flv_h263_decode_picture_header(MpegEncContext *s)
-{
- int format, width, height;
-
- /* picture header */
- if (get_bits_long(&s->gb, 17) != 1) {
- av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n");
- return -1;
- }
- format = get_bits(&s->gb, 5);
- if (format != 0 && format != 1) {
- av_log(s->avctx, AV_LOG_ERROR, "Bad picture format\n");
- return -1;
- }
- s->h263_flv = format+1;
- s->picture_number = get_bits(&s->gb, 8); /* picture timestamp */
- format = get_bits(&s->gb, 3);
- switch (format) {
- case 0:
- width = get_bits(&s->gb, 8);
- height = get_bits(&s->gb, 8);
- break;
- case 1:
- width = get_bits(&s->gb, 16);
- height = get_bits(&s->gb, 16);
- break;
- case 2:
- width = 352;
- height = 288;
- break;
- case 3:
- width = 176;
- height = 144;
- break;
- case 4:
- width = 128;
- height = 96;
- break;
- case 5:
- width = 320;
- height = 240;
- break;
- case 6:
- width = 160;
- height = 120;
- break;
- default:
- width = height = 0;
- break;
- }
- if(avcodec_check_dimensions(s->avctx, width, height))
- return -1;
- s->width = width;
- s->height = height;
-
- s->pict_type = FF_I_TYPE + get_bits(&s->gb, 2);
- s->dropable= s->pict_type > FF_P_TYPE;
- if (s->dropable)
- s->pict_type = FF_P_TYPE;
-
- skip_bits1(&s->gb); /* deblocking flag */
- s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
-
- s->h263_plus = 0;
-
- s->unrestricted_mv = 1;
- s->h263_long_vectors = 0;
-
- /* PEI */
- while (get_bits1(&s->gb) != 0) {
- skip_bits(&s->gb, 8);
- }
- s->f_code = 1;
-
- if(s->avctx->debug & FF_DEBUG_PICT_INFO){
- av_log(s->avctx, AV_LOG_DEBUG, "%c esc_type:%d, qp:%d num:%d\n",
- s->dropable ? 'D' : av_get_pict_type_char(s->pict_type), s->h263_flv-1, s->qscale, s->picture_number);
- }
-
- s->y_dc_scale_table=
- s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
-
- return 0;
-}