#include "avcodec.h"
#include "dsputil.h"
#include "mpegvideo.h"
-#include "mpegvideo_common.h"
#include "mpeg12.h"
#include "mpeg12data.h"
for(i=0;i<2;i++) {
if (USES_LIST(mb_type, i)) {
int dmx, dmy, mx, my, m;
+ const int my_shift= s->picture_structure == PICT_FRAME;
+
mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
s->last_mv[i][0][0]);
s->last_mv[i][0][0] = mx;
s->last_mv[i][1][0] = mx;
dmx = get_dmv(s);
my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
- s->last_mv[i][0][1] >> 1);
+ s->last_mv[i][0][1] >> my_shift);
dmy = get_dmv(s);
- s->last_mv[i][0][1] = my<<1;
- s->last_mv[i][1][1] = my<<1;
+ s->last_mv[i][0][1] = my<<my_shift;
+ s->last_mv[i][1][1] = my<<my_shift;
s->mv[i][0][0] = mx;
s->mv[i][0][1] = my;
int save_aspect_info;
int save_width, save_height, save_progressive_seq;
AVRational frame_rate_ext; ///< MPEG-2 specific framerate modificator
-
+ int sync; ///< Did we reach a sync point like a GOP/SEQ/KEYFrame?
} Mpeg1Context;
static av_cold int mpeg_decode_init(AVCodecContext *avctx)
MpegEncContext *s = &s1->mpeg_enc_ctx;
int ref, f_code, vbv_delay;
- if(mpeg_decode_postinit(s->avctx) < 0)
- return -2;
-
init_get_bits(&s->gb, buf, buf_size*8);
ref = get_bits(&s->gb, 10); /* temporal ref */
s->y_dc_scale = 8;
s->c_dc_scale = 8;
- s->first_slice = 1;
return 0;
}
s->pict_type= FF_B_TYPE;
s->current_picture.pict_type= s->pict_type;
s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
- s->first_slice= 1;
}
s->intra_dc_precision = get_bits(&s->gb, 2);
s->picture_structure = get_bits(&s->gb, 2);
s->chroma_420_type = get_bits1(&s->gb);
s->progressive_frame = get_bits1(&s->gb);
+ if(s->progressive_sequence && !s->progressive_frame){
+ s->progressive_frame= 1;
+ av_log(s->avctx, AV_LOG_ERROR, "interlaced frame in progressive sequence, ignoring\n");
+ }
+
+ if(s->picture_structure==0 || (s->progressive_frame && s->picture_structure!=PICT_FRAME)){
+ av_log(s->avctx, AV_LOG_ERROR, "picture_structure %d invalid, ignoring\n", s->picture_structure);
+ s->picture_structure= PICT_FRAME;
+ }
+
+ if(s->progressive_sequence && !s->frame_pred_frame_dct){
+ av_log(s->avctx, AV_LOG_ERROR, "invalid frame_pred_frame_dct\n");
+ s->frame_pred_frame_dct= 1;
+ }
+
if(s->picture_structure == PICT_FRAME){
s->first_field=0;
s->v_edge_pos= 16*s->mb_height;
dprintf(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
}
-static void mpeg_decode_extension(AVCodecContext *avctx,
- const uint8_t *buf, int buf_size)
-{
- Mpeg1Context *s1 = avctx->priv_data;
- MpegEncContext *s = &s1->mpeg_enc_ctx;
- int ext_type;
-
- init_get_bits(&s->gb, buf, buf_size*8);
-
- ext_type = get_bits(&s->gb, 4);
- switch(ext_type) {
- case 0x1:
- mpeg_decode_sequence_extension(s1);
- break;
- case 0x2:
- mpeg_decode_sequence_display_extension(s1);
- break;
- case 0x3:
- mpeg_decode_quant_matrix_extension(s);
- break;
- case 0x7:
- mpeg_decode_picture_display_extension(s1);
- break;
- case 0x8:
- mpeg_decode_picture_coding_extension(s1);
- break;
- }
-}
-
static void exchange_uv(MpegEncContext *s){
DCTELEM (*tmp)[64];
s->resync_mb_x=
s->resync_mb_y= -1;
- if (mb_y<<field_pic >= s->mb_height){
- av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s->mb_height);
- return -1;
- }
+ assert(mb_y < s->mb_height);
init_get_bits(&s->gb, *buf, buf_size*8);
s->mb_x=0;
+ if(mb_y==0 && s->codec_tag == AV_RL32("SLIF")){
+ skip_bits1(&s->gb);
+ }else{
+ for(;;) {
+ int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
+ if (code < 0){
+ av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
+ return -1;
+ }
+ if (code >= 33) {
+ if (code == 33) {
+ s->mb_x += 33;
+ }
+ /* otherwise, stuffing, nothing to do */
+ } else {
+ s->mb_x += code;
+ break;
+ }
+ }
+ }
+
+ if(s->mb_x >= (unsigned)s->mb_width){
+ av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
+ return -1;
+ }
+
if (avctx->hwaccel) {
const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
int start_code = -1;
return DECODE_SLICE_OK;
}
- for(;;) {
- int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
- if (code < 0){
- av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
- return -1;
- }
- if (code >= 33) {
- if (code == 33) {
- s->mb_x += 33;
- }
- /* otherwise, stuffing, nothing to do */
- } else {
- s->mb_x += code;
- break;
- }
- }
- if(s->mb_x >= (unsigned)s->mb_width){
- av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
- return -1;
- }
-
s->resync_mb_x= s->mb_x;
s->resync_mb_y= s->mb_y= mb_y;
s->mb_skip_run= 0;
return -1;
if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
- const int wrap = field_pic ? 2*s->b8_stride : s->b8_stride;
+ const int wrap = s->b8_stride;
int xy = s->mb_x*2 + s->mb_y*2*wrap;
int motion_x, motion_y, dir, i;
- if(field_pic && !s->first_field)
- xy += wrap/2;
for(i=0; i<2; i++){
for(dir=0; dir<2; dir++){
if (++s->mb_x >= s->mb_width) {
const int mb_size= 16>>s->avctx->lowres;
- ff_draw_horiz_band(s, mb_size*s->mb_y, mb_size);
+ ff_draw_horiz_band(s, mb_size*(s->mb_y>>field_pic), mb_size);
s->mb_x = 0;
- s->mb_y++;
+ s->mb_y += 1<<field_pic;
- if(s->mb_y<<field_pic >= s->mb_height){
- int left= s->gb.size_in_bits - get_bits_count(&s->gb);
+ if(s->mb_y >= s->mb_height){
+ int left= get_bits_left(&s->gb);
int is_d10= s->chroma_format==2 && s->pict_type==FF_I_TYPE && avctx->profile==0 && avctx->level==5
&& s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
&& s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
s->mv[0][0][0] = s->mv[0][0][1] = 0;
s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
- s->field_select[0][0]= s->picture_structure - 1;
+ s->field_select[0][0]= (s->picture_structure - 1) & 1;
} else {
/* if B type, reuse previous vectors and directions */
s->mv[0][0][0] = s->last_mv[0][0][0];
MpegEncContext *s= *(void**)arg;
const uint8_t *buf= s->gb.buffer;
int mb_y= s->start_mb_y;
+ const int field_pic= s->picture_structure != PICT_FRAME;
- s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width;
+ s->error_count= (3*(s->end_mb_y - s->start_mb_y)*s->mb_width) >> field_pic;
for(;;){
uint32_t start_code;
static void mpeg_decode_user_data(AVCodecContext *avctx,
- const uint8_t *buf, int buf_size)
+ const uint8_t *p, int buf_size)
{
- const uint8_t *p;
- int len, flags;
- p = buf;
- len = buf_size;
+ const uint8_t *buf_end = p+buf_size;
/* we parse the DTG active format information */
- if (len >= 5 &&
+ if (buf_end - p >= 5 &&
p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
- flags = p[4];
+ int flags = p[4];
p += 5;
- len -= 5;
if (flags & 0x80) {
/* skip event id */
- if (len < 2)
- return;
p += 2;
- len -= 2;
}
if (flags & 0x40) {
- if (len < 1)
+ if (buf_end - p < 1)
return;
avctx->dtg_active_format = p[0] & 0x0f;
}
const uint8_t *buf_ptr = buf;
const uint8_t *buf_end = buf + buf_size;
int ret, input_size;
+ int last_code= 0;
for(;;) {
/* find next start code */
if(avctx->thread_count > 1){
int i;
- avctx->execute(avctx, slice_decode_thread, (void**)&(s2->thread_context[0]), NULL, s->slice_count, sizeof(void*));
+ avctx->execute(avctx, slice_decode_thread, &s2->thread_context[0], NULL, s->slice_count, sizeof(void*));
for(i=0; i<s->slice_count; i++)
s2->error_count += s2->thread_context[i]->error_count;
}
/* prepare data for next start code */
switch(start_code) {
case SEQ_START_CODE:
+ if(last_code == 0){
mpeg1_decode_sequence(avctx, buf_ptr,
input_size);
+ s->sync=1;
+ }else{
+ av_log(avctx, AV_LOG_ERROR, "ignoring SEQ_START_CODE after %X\n", last_code);
+ }
break;
case PICTURE_START_CODE:
+ if(last_code == 0 || last_code == SLICE_MIN_START_CODE){
+ if(mpeg_decode_postinit(avctx) < 0){
+ av_log(avctx, AV_LOG_ERROR, "mpeg_decode_postinit() failure\n");
+ return -1;
+ }
+
/* we have a complete image: we try to decompress it */
if(mpeg1_decode_picture(avctx,
buf_ptr, input_size) < 0)
s2->pict_type=0;
+ s2->first_slice = 1;
+ last_code= PICTURE_START_CODE;
+ }else{
+ av_log(avctx, AV_LOG_ERROR, "ignoring pic after %X\n", last_code);
+ }
break;
case EXT_START_CODE:
- mpeg_decode_extension(avctx,
- buf_ptr, input_size);
+ init_get_bits(&s2->gb, buf_ptr, input_size*8);
+
+ switch(get_bits(&s2->gb, 4)) {
+ case 0x1:
+ if(last_code == 0){
+ mpeg_decode_sequence_extension(s);
+ }else{
+ av_log(avctx, AV_LOG_ERROR, "ignoring seq ext after %X\n", last_code);
+ }
+ break;
+ case 0x2:
+ mpeg_decode_sequence_display_extension(s);
+ break;
+ case 0x3:
+ mpeg_decode_quant_matrix_extension(s2);
+ break;
+ case 0x7:
+ mpeg_decode_picture_display_extension(s);
+ break;
+ case 0x8:
+ if(last_code == PICTURE_START_CODE){
+ mpeg_decode_picture_coding_extension(s);
+ }else{
+ av_log(avctx, AV_LOG_ERROR, "ignoring pic cod ext after %X\n", last_code);
+ }
+ break;
+ }
break;
case USER_START_CODE:
mpeg_decode_user_data(avctx,
buf_ptr, input_size);
break;
case GOP_START_CODE:
+ if(last_code == 0){
s2->first_field=0;
mpeg_decode_gop(avctx,
buf_ptr, input_size);
+ s->sync=1;
+ }else{
+ av_log(avctx, AV_LOG_ERROR, "ignoring GOP_START_CODE after %X\n", last_code);
+ }
break;
default:
if (start_code >= SLICE_MIN_START_CODE &&
- start_code <= SLICE_MAX_START_CODE) {
- int mb_y= start_code - SLICE_MIN_START_CODE;
+ start_code <= SLICE_MAX_START_CODE && last_code!=0) {
+ const int field_pic= s2->picture_structure != PICT_FRAME;
+ int mb_y= (start_code - SLICE_MIN_START_CODE) << field_pic;
+ last_code= SLICE_MIN_START_CODE;
+
+ if(s2->picture_structure == PICT_BOTTOM_FIELD)
+ mb_y++;
+
+ if (mb_y >= s2->mb_height){
+ av_log(s2->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
+ return -1;
+ }
if(s2->last_picture_ptr==NULL){
/* Skip B-frames if we do not have reference frames and gop is not closed */
if(s2->pict_type==FF_B_TYPE){
- int i;
if(!s2->closed_gop)
break;
- /* Allocate a dummy frame */
- i= ff_find_unused_picture(s2, 0);
- s2->last_picture_ptr= &s2->picture[i];
- if(alloc_picture(s2, s2->last_picture_ptr, 0) < 0)
- return -1;
}
}
+ if(s2->pict_type==FF_I_TYPE)
+ s->sync=1;
if(s2->next_picture_ptr==NULL){
/* Skip P-frames if we do not have a reference frame or we have an invalid header. */
- if(s2->pict_type==FF_P_TYPE && (s2->first_field || s2->picture_structure==PICT_FRAME)) break;
+ if(s2->pict_type==FF_P_TYPE && !s->sync) break;
}
/* Skip B-frames if we are in a hurry. */
if(avctx->hurry_up && s2->pict_type==FF_B_TYPE) break;
}
}
+static void flush(AVCodecContext *avctx){
+ Mpeg1Context *s = avctx->priv_data;
+
+ s->sync=0;
+
+ ff_mpeg_flush(avctx);
+}
+
static int mpeg_decode_end(AVCodecContext *avctx)
{
Mpeg1Context *s = avctx->priv_data;
mpeg_decode_end,
mpeg_decode_frame,
CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
- .flush= ff_mpeg_flush,
+ .flush= flush,
.long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
};
mpeg_decode_end,
mpeg_decode_frame,
CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
- .flush= ff_mpeg_flush,
+ .flush= flush,
.long_name= NULL_IF_CONFIG_SMALL("MPEG-2 video"),
};
mpeg_decode_end,
mpeg_decode_frame,
CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
- .flush= ff_mpeg_flush,
+ .flush= flush,
.long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
};
mpeg_decode_end,
mpeg_decode_frame,
CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
- .flush= ff_mpeg_flush,
+ .flush= flush,
.long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
};
mpeg_decode_end,
mpeg_decode_frame,
CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
- .flush= ff_mpeg_flush,
+ .flush= flush,
.long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
};
#endif
mpeg_decode_end,
mpeg_decode_frame,
CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
- .flush= ff_mpeg_flush,
+ .flush= flush,
.long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
};
#endif