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support decoding of the last mpeg "packet" even if no startcode is immedeatly afterwards (fixes bugs with mpeg in avi)

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new behavior is only activated if CODEC_FLAG_NOT_TRUNCATED is set

Originally committed as revision 909 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer
2002-09-06 22:30:16 +00:00
parent ad4369076b
commit 14207b27b5
2 changed files with 15 additions and 4 deletions
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1
libavcodec/avcodec.h
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@@ -119,6 +119,7 @@ static const int Motion_Est_QTab[] = { ME_ZERO, ME_PHODS, ME_LOG,
#define CODEC_FLAG_GRAY 0x2000 /* only decode/encode grayscale */
#define CODEC_FLAG_EMU_EDGE 0x4000/* dont draw edges */
#define CODEC_FLAG_DR1 0x8000 /* dr1 */
#define CODEC_FLAG_NOT_TRUNCATED 0x00010000 /* input bitstream is not truncated, except before a startcode */
/* codec capabilities */
/* decoder can use draw_horiz_band callback */

18
libavcodec/mpeg12.c
View File

@@ -584,7 +584,7 @@ static VLC mb_ptype_vlc;
static VLC mb_btype_vlc;
static VLC mb_pat_vlc;
void mpeg1_init_vlc(MpegEncContext *s)
static void init_vlcs(MpegEncContext *s)
{
static int done = 0;
@@ -1260,6 +1260,7 @@ static int mpeg_decode_init(AVCodecContext *avctx)
s->mpeg_enc_ctx.flags= avctx->flags;
common_init(&s->mpeg_enc_ctx);
init_vlcs(&s->mpeg_enc_ctx);
s->header_state = 0xff;
s->mpeg_enc_ctx_allocated = 0;
@@ -1468,7 +1469,7 @@ static int mpeg_decode_slice(AVCodecContext *avctx,
start_code = (start_code - 1) & 0xff;
if (start_code >= s->mb_height){
fprintf(stderr, "slice below image\n");
fprintf(stderr, "slice below image (%d >= %d)\n", start_code, s->mb_height);
return -1;
}
s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
@@ -1590,7 +1591,6 @@ static int mpeg1_decode_sequence(AVCodecContext *avctx,
if (MPV_common_init(s) < 0)
return -1;
mpeg1_init_vlc(s);
s1->mpeg_enc_ctx_allocated = 1;
}
@@ -1711,7 +1711,17 @@ static int mpeg_decode_frame(AVCodecContext *avctx,
} else {
memcpy(s->buf_ptr, buf_start, len);
s->buf_ptr += len;
if( (s2->flags&CODEC_FLAG_NOT_TRUNCATED) && (!start_code_found)
&& s->buf_ptr+4<s->buffer+s->buffer_size){
start_code_found= 1;
code= 0x1FF;
s->header_state=0xFF;
s->buf_ptr[0]=0;
s->buf_ptr[1]=0;
s->buf_ptr[2]=1;
s->buf_ptr[3]=0xFF;
s->buf_ptr+=4;
}
if (start_code_found) {
/* prepare data for next start code */
input_size = s->buf_ptr - s->buffer;