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mpeg1/2 identifier - fixed frame rate for some bad mpeg1 streams

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Originally committed as revision 542 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Fabrice Bellard 2002-05-20 16:24:39 +00:00
parent 4d7a0a0593
commit fb4a4a5607
1 changed files with 9 additions and 2 deletions
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11
libavcodec/mpeg12.c
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@ -1283,6 +1283,7 @@ static void mpeg_decode_sequence_extension(MpegEncContext *s)
s->frame_rate = (s->frame_rate * frame_rate_ext_n) / frame_rate_ext_d;
dprintf("sequence extension\n");
s->mpeg2 = 1;
s->avctx->sub_id = 2; /* indicates mpeg2 found */
}
static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
@ -1472,7 +1473,7 @@ static int mpeg1_decode_sequence(AVCodecContext *avctx,
Mpeg1Context *s1 = avctx->priv_data;
MpegEncContext *s = &s1->mpeg_enc_ctx;
int width, height, i, v, j;
init_get_bits(&s->gb, buf, buf_size);
width = get_bits(&s->gb, 12);
@ -1500,7 +1501,12 @@ static int mpeg1_decode_sequence(AVCodecContext *avctx,
s->avctx = avctx;
avctx->width = width;
avctx->height = height;
avctx->frame_rate = frame_rate_tab[s->frame_rate_index];
if (s->frame_rate_index >= 9) {
/* at least give a valid frame rate (some old mpeg1 have this) */
avctx->frame_rate = 25 * FRAME_RATE_BASE;
} else {
avctx->frame_rate = frame_rate_tab[s->frame_rate_index];
}
s->frame_rate = avctx->frame_rate;
avctx->bit_rate = s->bit_rate;
@ -1561,6 +1567,7 @@ static int mpeg1_decode_sequence(AVCodecContext *avctx,
s->picture_structure = PICT_FRAME;
s->frame_pred_frame_dct = 1;
s->mpeg2 = 0;
avctx->sub_id = 1; /* indicates mpeg1 */
return 0;
}