MpegEncContext s;
int current_mba;
+ int previous_mba;
int mba_diff;
int mtype;
int current_mv_x;
int current_mv_y;
int gob_number;
- int bits_left; //8 - nr of bits left of the following frame in the last byte in this frame
- int last_bits; //bits left of the following frame in the last byte in this frame
int gob_start_code_skipped; // 1 if gob start code is already read before gob header is read
}H261Context;
-void ff_h261_loop_filter(H261Context * h){
- MpegEncContext * const s = &h->s;
+void ff_h261_loop_filter(MpegEncContext *s){
+ H261Context * h= (H261Context*)s;
const int linesize = s->linesize;
const int uvlinesize= s->uvlinesize;
uint8_t *dest_y = s->dest[0];
uint8_t *dest_cb= s->dest[1];
uint8_t *dest_cr= s->dest[2];
-
+
+ if(!(IS_FIL (h->mtype)))
+ return;
+
s->dsp.h261_loop_filter(dest_y , linesize);
s->dsp.h261_loop_filter(dest_y + 8, linesize);
s->dsp.h261_loop_filter(dest_y + 8 * linesize , linesize);
s->dsp.h261_loop_filter(dest_cr, uvlinesize);
}
+static int ff_h261_get_picture_format(int width, int height){
+ // QCIF
+ if (width == 176 && height == 144)
+ return 0;
+ // CIF
+ else if (width == 352 && height == 288)
+ return 1;
+ // ERROR
+ else
+ return -1;
+}
+
+static void h261_encode_block(H261Context * h, DCTELEM * block,
+ int n);
static int h261_decode_block(H261Context *h, DCTELEM *block,
int n, int coded);
-static int h261_decode_mb(H261Context *h);
-void ff_set_qscale(MpegEncContext * s, int qscale);
+
+void ff_h261_encode_picture_header(MpegEncContext * s, int picture_number){
+ H261Context * h = (H261Context *) s;
+ int format, temp_ref;
+
+ align_put_bits(&s->pb);
+
+ /* Update the pointer to last GOB */
+ s->ptr_lastgob = pbBufPtr(&s->pb);
+
+ put_bits(&s->pb, 20, 0x10); /* PSC */
+
+ temp_ref= s->picture_number * (int64_t)30000 * s->avctx->time_base.num /
+ (1001 * (int64_t)s->avctx->time_base.den); //FIXME maybe this should use a timestamp
+ put_bits(&s->pb, 5, temp_ref & 0x1f); /* TemporalReference */
+
+ put_bits(&s->pb, 1, 0); /* split screen off */
+ put_bits(&s->pb, 1, 0); /* camera off */
+ put_bits(&s->pb, 1, 0); /* freeze picture release off */
+
+ format = ff_h261_get_picture_format(s->width, s->height);
+
+ put_bits(&s->pb, 1, format); /* 0 == QCIF, 1 == CIF */
+
+ put_bits(&s->pb, 1, 0); /* still image mode */
+ put_bits(&s->pb, 1, 0); /* reserved */
+
+ put_bits(&s->pb, 1, 0); /* no PEI */
+ if(format == 0)
+ h->gob_number = -1;
+ else
+ h->gob_number = 0;
+ h->current_mba = 0;
+}
+
+/**
+ * Encodes a group of blocks header.
+ */
+static void h261_encode_gob_header(MpegEncContext * s, int mb_line){
+ H261Context * h = (H261Context *)s;
+ if(ff_h261_get_picture_format(s->width, s->height) == 0){
+ h->gob_number+=2; // QCIF
+ }
+ else{
+ h->gob_number++; // CIF
+ }
+ put_bits(&s->pb, 16, 1); /* GBSC */
+ put_bits(&s->pb, 4, h->gob_number); /* GN */
+ put_bits(&s->pb, 5, s->qscale); /* GQUANT */
+ put_bits(&s->pb, 1, 0); /* no GEI */
+ h->current_mba = 0;
+ h->previous_mba = 0;
+ h->current_mv_x=0;
+ h->current_mv_y=0;
+}
+
+void ff_h261_reorder_mb_index(MpegEncContext* s){
+ int index= s->mb_x + s->mb_y*s->mb_width;
+
+ if(index % 33 == 0)
+ h261_encode_gob_header(s,0);
+
+ /* for CIF the GOB's are fragmented in the middle of a scanline
+ that's why we need to adjust the x and y index of the macroblocks */
+ if(ff_h261_get_picture_format(s->width,s->height) == 1){ // CIF
+ s->mb_x = index % 11 ; index /= 11;
+ s->mb_y = index % 3 ; index /= 3;
+ s->mb_x+= 11*(index % 2); index /= 2;
+ s->mb_y+= 3*index;
+
+ ff_init_block_index(s);
+ ff_update_block_index(s);
+ }
+}
+
+static void h261_encode_motion(H261Context * h, int val){
+ MpegEncContext * const s = &h->s;
+ int sign, code;
+ if(val==0){
+ code = 0;
+ put_bits(&s->pb,h261_mv_tab[code][1],h261_mv_tab[code][0]);
+ }
+ else{
+ if(val > 15)
+ val -=32;
+ if(val < -16)
+ val+=32;
+ sign = val < 0;
+ code = sign ? -val : val;
+ put_bits(&s->pb,h261_mv_tab[code][1],h261_mv_tab[code][0]);
+ put_bits(&s->pb,1,sign);
+ }
+}
+
+static inline int get_cbp(MpegEncContext * s,
+ DCTELEM block[6][64])
+{
+ int i, cbp;
+ cbp= 0;
+ for (i = 0; i < 6; i++) {
+ if (s->block_last_index[i] >= 0)
+ cbp |= 1 << (5 - i);
+ }
+ return cbp;
+}
+void ff_h261_encode_mb(MpegEncContext * s,
+ DCTELEM block[6][64],
+ int motion_x, int motion_y)
+{
+ H261Context * h = (H261Context *)s;
+ int mvd, mv_diff_x, mv_diff_y, i, cbp;
+ cbp = 63; // avoid warning
+ mvd = 0;
+
+ h->current_mba++;
+ h->mtype = 0;
+
+ if (!s->mb_intra){
+ /* compute cbp */
+ cbp= get_cbp(s, block);
+
+ /* mvd indicates if this block is motion compensated */
+ mvd = motion_x | motion_y;
+
+ if((cbp | mvd | s->dquant ) == 0) {
+ /* skip macroblock */
+ s->skip_count++;
+ h->current_mv_x=0;
+ h->current_mv_y=0;
+ return;
+ }
+ }
+
+ /* MB is not skipped, encode MBA */
+ put_bits(&s->pb, h261_mba_bits[(h->current_mba-h->previous_mba)-1], h261_mba_code[(h->current_mba-h->previous_mba)-1]);
+
+ /* calculate MTYPE */
+ if(!s->mb_intra){
+ h->mtype++;
+
+ if(mvd || s->loop_filter)
+ h->mtype+=3;
+ if(s->loop_filter)
+ h->mtype+=3;
+ if(cbp || s->dquant)
+ h->mtype++;
+ assert(h->mtype > 1);
+ }
+
+ if(s->dquant)
+ h->mtype++;
+
+ put_bits(&s->pb, h261_mtype_bits[h->mtype], h261_mtype_code[h->mtype]);
+
+ h->mtype = h261_mtype_map[h->mtype];
+
+ if(IS_QUANT(h->mtype)){
+ ff_set_qscale(s,s->qscale+s->dquant);
+ put_bits(&s->pb, 5, s->qscale);
+ }
+
+ if(IS_16X16(h->mtype)){
+ mv_diff_x = (motion_x >> 1) - h->current_mv_x;
+ mv_diff_y = (motion_y >> 1) - h->current_mv_y;
+ h->current_mv_x = (motion_x >> 1);
+ h->current_mv_y = (motion_y >> 1);
+ h261_encode_motion(h,mv_diff_x);
+ h261_encode_motion(h,mv_diff_y);
+ }
+
+ h->previous_mba = h->current_mba;
+
+ if(HAS_CBP(h->mtype)){
+ put_bits(&s->pb,h261_cbp_tab[cbp-1][1],h261_cbp_tab[cbp-1][0]);
+ }
+ for(i=0; i<6; i++) {
+ /* encode each block */
+ h261_encode_block(h, block[i], i);
+ }
+
+ if ( ( h->current_mba == 11 ) || ( h->current_mba == 22 ) || ( h->current_mba == 33 ) || ( !IS_16X16 ( h->mtype ) )){
+ h->current_mv_x=0;
+ h->current_mv_y=0;
+ }
+}
+
+void ff_h261_encode_init(MpegEncContext *s){
+ static int done = 0;
+
+ if (!done) {
+ done = 1;
+ init_rl(&h261_rl_tcoeff, 1);
+ }
+
+ s->min_qcoeff= -127;
+ s->max_qcoeff= 127;
+ s->y_dc_scale_table=
+ s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
+}
+
+
+/**
+ * encodes a 8x8 block.
+ * @param block the 8x8 block
+ * @param n block index (0-3 are luma, 4-5 are chroma)
+ */
+static void h261_encode_block(H261Context * h, DCTELEM * block, int n){
+ MpegEncContext * const s = &h->s;
+ int level, run, last, i, j, last_index, last_non_zero, sign, slevel, code;
+ RLTable *rl;
+
+ rl = &h261_rl_tcoeff;
+ if (s->mb_intra) {
+ /* DC coef */
+ level = block[0];
+ /* 255 cannot be represented, so we clamp */
+ if (level > 254) {
+ level = 254;
+ block[0] = 254;
+ }
+ /* 0 cannot be represented also */
+ else if (level < 1) {
+ level = 1;
+ block[0] = 1;
+ }
+ if (level == 128)
+ put_bits(&s->pb, 8, 0xff);
+ else
+ put_bits(&s->pb, 8, level);
+ i = 1;
+ } else if((block[0]==1 || block[0] == -1) && (s->block_last_index[n] > -1)){
+ //special case
+ put_bits(&s->pb,2,block[0]>0 ? 2 : 3 );
+ i = 1;
+ } else {
+ i = 0;
+ }
+
+ /* AC coefs */
+ last_index = s->block_last_index[n];
+ last_non_zero = i - 1;
+ for (; i <= last_index; i++) {
+ j = s->intra_scantable.permutated[i];
+ level = block[j];
+ if (level) {
+ run = i - last_non_zero - 1;
+ last = (i == last_index);
+ sign = 0;
+ slevel = level;
+ if (level < 0) {
+ sign = 1;
+ level = -level;
+ }
+ code = get_rl_index(rl, 0 /*no last in H.261, EOB is used*/, run, level);
+ if(run==0 && level < 16)
+ code+=1;
+ put_bits(&s->pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
+ if (code == rl->n) {
+ put_bits(&s->pb, 6, run);
+ assert(slevel != 0);
+ assert(level <= 127);
+ put_bits(&s->pb, 8, slevel & 0xff);
+ } else {
+ put_bits(&s->pb, 1, sign);
+ }
+ last_non_zero = i;
+ }
+ }
+ if(last_index > -1){
+ put_bits(&s->pb, rl->table_vlc[0][1], rl->table_vlc[0][0]);// END OF BLOCK
+ }
+}
/***********************************************/
/* decoding */
static VLC h261_mv_vlc;
static VLC h261_cbp_vlc;
-void init_vlc_rl(RLTable *rl);
+void init_vlc_rl(RLTable *rl, int use_static);
static void h261_decode_init_vlc(H261Context *h){
static int done = 0;
done = 1;
init_vlc(&h261_mba_vlc, H261_MBA_VLC_BITS, 35,
h261_mba_bits, 1, 1,
- h261_mba_code, 1, 1);
+ h261_mba_code, 1, 1, 1);
init_vlc(&h261_mtype_vlc, H261_MTYPE_VLC_BITS, 10,
h261_mtype_bits, 1, 1,
- h261_mtype_code, 1, 1);
+ h261_mtype_code, 1, 1, 1);
init_vlc(&h261_mv_vlc, H261_MV_VLC_BITS, 17,
&h261_mv_tab[0][1], 2, 1,
- &h261_mv_tab[0][0], 2, 1);
+ &h261_mv_tab[0][0], 2, 1, 1);
init_vlc(&h261_cbp_vlc, H261_CBP_VLC_BITS, 63,
&h261_cbp_tab[0][1], 2, 1,
- &h261_cbp_tab[0][0], 2, 1);
- init_rl(&h261_rl_tcoeff);
- init_vlc_rl(&h261_rl_tcoeff);
+ &h261_cbp_tab[0][0], 2, 1, 1);
+ init_rl(&h261_rl_tcoeff, 1);
+ init_vlc_rl(&h261_rl_tcoeff, 1);
}
}
MPV_decode_defaults(s);
s->avctx = avctx;
- s->width = s->avctx->width;
- s->height = s->avctx->height;
+ s->width = s->avctx->coded_width;
+ s->height = s->avctx->coded_height;
s->codec_id = s->avctx->codec->id;
s->out_format = FMT_H261;
h261_decode_init_vlc(h);
- h->bits_left = 0;
- h->last_bits = 0;
h->gob_start_code_skipped = 0;
return 0;
xy = s->mb_x + s->mb_y * s->mb_stride;
ff_init_block_index(s);
ff_update_block_index(s);
- s->dsp.clear_blocks(s->block[0]);
for(j=0;j<6;j++)
s->block_last_index[j] = -1;
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_skiped = 1;
+ s->mb_skipped = 1;
+ h->mtype &= ~MB_TYPE_H261_FIL;
MPV_decode_mb(s, s->block);
}
static int h261_decode_mb(H261Context *h){
MpegEncContext * const s = &h->s;
- int i, cbp, xy, old_mtype;
+ int i, cbp, xy;
cbp = 63;
// Read mba
xy = s->mb_x + s->mb_y * s->mb_stride;
ff_init_block_index(s);
ff_update_block_index(s);
- s->dsp.clear_blocks(s->block[0]);
// Read mtype
- old_mtype = h->mtype;
h->mtype = get_vlc2(&s->gb, h261_mtype_vlc.table, H261_MTYPE_VLC_BITS, 2);
h->mtype = h261_mtype_map[h->mtype];
// 2) evaluating MVD for macroblocks in which MBA does not represent a difference of 1;
// 3) MTYPE of the previous macroblock was not MC.
if ( ( h->current_mba == 1 ) || ( h->current_mba == 12 ) || ( h->current_mba == 23 ) ||
- ( h->mba_diff != 1) || ( !IS_16X16 ( old_mtype ) ))
+ ( h->mba_diff != 1))
{
h->current_mv_x = 0;
h->current_mv_y = 0;
h->current_mv_x= decode_mv_component(&s->gb, h->current_mv_x);
h->current_mv_y= decode_mv_component(&s->gb, h->current_mv_y);
+ }else{
+ h->current_mv_x = 0;
+ h->current_mv_y = 0;
}
// Read cbp
s->mv_dir = MV_DIR_FORWARD;
s->mv_type = MV_TYPE_16X16;
s->current_picture.mb_type[xy]= MB_TYPE_16x16 | MB_TYPE_L0;
- if(IS_16X16 ( h->mtype )){
- s->mv[0][0][0] = h->current_mv_x * 2;//gets divided by 2 in motion compensation
- s->mv[0][0][1] = h->current_mv_y * 2;
- }
- else{
- h->current_mv_x = s->mv[0][0][0] = 0;
- h->current_mv_x = s->mv[0][0][1] = 0;
- }
+ s->mv[0][0][0] = h->current_mv_x * 2;//gets divided by 2 in motion compensation
+ s->mv[0][0][1] = h->current_mv_y * 2;
intra:
/* decode each block */
if(s->mb_intra || HAS_CBP(h->mtype)){
+ s->dsp.clear_blocks(s->block[0]);
for (i = 0; i < 6; i++) {
if (h261_decode_block(h, s->block[i], i, cbp&32) < 0){
return SLICE_ERROR;
}
cbp+=cbp;
}
+ }else{
+ for (i = 0; i < 6; i++)
+ s->block_last_index[i]= -1;
}
MPV_decode_mb(s, s->block);
- if(IS_FIL (h->mtype)){
- ff_h261_loop_filter(h);
- }
-
return SLICE_OK;
}
/* escape */
// The remaining combinations of (run, level) are encoded with a 20-bit word consisting of 6 bits escape, 6 bits run and 8 bits level.
run = get_bits(&s->gb, 6);
- level = (int8_t)get_bits(&s->gb, 8);
+ level = get_sbits(&s->gb, 8);
}else if(code == 0){
break;
}else{
int h261_decode_picture_header(H261Context *h){
MpegEncContext * const s = &h->s;
int format, i;
- uint32_t startcode;
- align_get_bits(&s->gb);
-
- startcode = (h->last_bits << (12 - (8-h->bits_left))) | get_bits(&s->gb, 20-8 - (8- h->bits_left));
+ uint32_t startcode= 0;
for(i= s->gb.size_in_bits - get_bits_count(&s->gb); i>24; i-=1){
startcode = ((startcode << 1) | get_bits(&s->gb, 1)) & 0x000FFFFF;
}
static int h261_find_frame_end(ParseContext *pc, AVCodecContext* avctx, const uint8_t *buf, int buf_size){
- int vop_found, i, j, bits_left, last_bits;
+ int vop_found, i, j;
uint32_t state;
- H261Context *h = avctx->priv_data;
-
- if(h){
- bits_left = h->bits_left;
- last_bits = h->last_bits;
- }
- else{
- bits_left = 0;
- last_bits = 0;
- }
-
vop_found= pc->frame_start_found;
state= pc->state;
- if(bits_left!=0 && !vop_found)
- state = state << (8-bits_left) | last_bits;
- i=0;
- if(!vop_found){
- for(i=0; i<buf_size; i++){
- state= (state<<8) | buf[i];
- for(j=0; j<8; j++){
- if(( ( (state<<j) | (buf[i]>>(8-j)) )>>(32-20) == 0x10 )&&(((state >> (17-j)) & 0x4000) == 0x0)){
- i++;
- vop_found=1;
- break;
- }
+
+ for(i=0; i<buf_size && !vop_found; i++){
+ state= (state<<8) | buf[i];
+ for(j=0; j<8; j++){
+ if(((state>>j)&0xFFFFF) == 0x00010){
+ i++;
+ vop_found=1;
+ break;
}
- if(vop_found)
- break;
}
}
if(vop_found){
for(; i<buf_size; i++){
- if(avctx->flags & CODEC_FLAG_TRUNCATED)//XXX ffplay workaround, someone a better solution?
- state= (state<<8) | buf[i];
+ state= (state<<8) | buf[i];
for(j=0; j<8; j++){
- if(( ( (state<<j) | (buf[i]>>(8-j)) )>>(32-20) == 0x10 )&&(((state >> (17-j)) & 0x4000) == 0x0)){
+ if(((state>>j)&0xFFFFF) == 0x00010){
pc->frame_start_found=0;
- pc->state=-1;
- return i-3;
+ pc->state= state>>(2*8);
+ return i-1;
}
}
}
* returns the number of bytes consumed for building the current frame
*/
static int get_consumed_bytes(MpegEncContext *s, int buf_size){
- int pos= (get_bits_count(&s->gb)+7)>>3;
-
- if(s->flags&CODEC_FLAG_TRUNCATED){
- pos -= s->parse_context.last_index;
- if(pos<0) pos=0;// padding is not really read so this might be -1
- return pos;
- }else{
- if(pos==0) pos=1; //avoid infinite loops (i doubt thats needed but ...)
- if(pos+10>buf_size) pos=buf_size; // oops ;)
+ int pos= get_bits_count(&s->gb)>>3;
+ if(pos==0) pos=1; //avoid infinite loops (i doubt thats needed but ...)
+ if(pos+10>buf_size) pos=buf_size; // oops ;)
- return pos;
- }
+ return pos;
}
static int h261_decode_frame(AVCodecContext *avctx,
s->flags= avctx->flags;
s->flags2= avctx->flags2;
- /* no supplementary picture */
- if (buf_size == 0) {
-
- return 0;
- }
-
- if(s->flags&CODEC_FLAG_TRUNCATED){
- int next;
-
- next= h261_find_frame_end(&s->parse_context,avctx, buf, buf_size);
-
- if( ff_combine_frame(&s->parse_context, next, &buf, &buf_size) < 0 )
- return buf_size;
- }
-
+ h->gob_start_code_skipped=0;
retry:
return -1;
}
- if (s->width != avctx->width || s->height != avctx->height){
+ if (s->width != avctx->coded_width || s->height != avctx->coded_height){
ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
s->parse_context.buffer=0;
MPV_common_end(s);
s->parse_context= pc;
}
if (!s->context_initialized) {
- avctx->width = s->width;
- avctx->height = s->height;
+ avcodec_set_dimensions(avctx, s->width, s->height);
goto retry;
}
}
MPV_frame_end(s);
- // h261 doesn't have byte aligned codes
- // store the bits of the next frame that are left in the last byte
- // in the H261Context and remember the number of stored bits
- {
- int bitsleft;
- int current_pos= get_bits_count(&s->gb)>>3;
- bitsleft = (current_pos<<3) - get_bits_count(&s->gb);
- h->bits_left = - bitsleft;
- if(bitsleft > 0)
- h->last_bits= get_bits(&s->gb, 8 - h->bits_left);
- else
- h->last_bits = 0;
- }
-
assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
assert(s->current_picture.pict_type == s->pict_type);
- *pict= *(AVFrame*)&s->current_picture;
+ *pict= *(AVFrame*)s->current_picture_ptr;
ff_print_debug_info(s, pict);
/* Return the Picture timestamp as the frame number */
return 0;
}
+#ifdef CONFIG_ENCODERS
+AVCodec h261_encoder = {
+ "h261",
+ CODEC_TYPE_VIDEO,
+ CODEC_ID_H261,
+ sizeof(H261Context),
+ MPV_encode_init,
+ MPV_encode_picture,
+ MPV_encode_end,
+};
+#endif
+
AVCodec h261_decoder = {
"h261",
CODEC_TYPE_VIDEO,
NULL,
h261_decode_end,
h261_decode_frame,
- CODEC_CAP_TRUNCATED,
+ CODEC_CAP_DR1,
};
AVCodecParser h261_parser = {
projects / ffmpeg / blobdiff