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| author | Michael Niedermayer <michaelni@gmx.at> | 2008-09-28 23:19:12 +0000 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2008-09-28 23:19:12 +0000 |
| commit | ed16f91f26aeb3156d4d130b7abacdd49f23a04c (patch) | |
| tree | cec72be213655c62c5b0939ab27810db937f5139 /libavcodec/mpeg12.c | |
| parent | d5e34dcb727c0888924fafaa260f9524742a8813 (diff) | |
Guess picture type from picture coding extension when the main header is damaged.
Originally committed as revision 15456 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/mpeg12.c')
| -rw-r--r-- | libavcodec/mpeg12.c | 30 |
1 files changed, 26 insertions, 4 deletions
diff --git a/libavcodec/mpeg12.c b/libavcodec/mpeg12.c index 54779ac9d7..7d81863924 100644 --- a/libavcodec/mpeg12.c +++ b/libavcodec/mpeg12.c @@ -1501,13 +1501,28 @@ static void mpeg_decode_quant_matrix_extension(MpegEncContext *s) } } -static void mpeg_decode_picture_coding_extension(MpegEncContext *s) +static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1) { + MpegEncContext *s= &s1->mpeg_enc_ctx; + s->full_pel[0] = s->full_pel[1] = 0; s->mpeg_f_code[0][0] = get_bits(&s->gb, 4); s->mpeg_f_code[0][1] = get_bits(&s->gb, 4); s->mpeg_f_code[1][0] = get_bits(&s->gb, 4); s->mpeg_f_code[1][1] = get_bits(&s->gb, 4); + if(!s->pict_type && s1->mpeg_enc_ctx_allocated){ + av_log(s->avctx, AV_LOG_ERROR, "Missing picture start code, guessing missing values\n"); + if(s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1]==15){ + if(s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15) + s->pict_type= FF_I_TYPE; + else + s->pict_type= FF_P_TYPE; + }else + 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->top_field_first = get_bits1(&s->gb); @@ -1573,7 +1588,7 @@ static void mpeg_decode_extension(AVCodecContext *avctx, mpeg_decode_picture_display_extension(s1); break; case 0x8: - mpeg_decode_picture_coding_extension(s); + mpeg_decode_picture_coding_extension(s1); break; } } @@ -2293,6 +2308,7 @@ static int decode_chunks(AVCodecContext *avctx, *data_size = sizeof(AVPicture); } } + s2->pict_type= 0; return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index); } @@ -2311,8 +2327,9 @@ static int decode_chunks(AVCodecContext *avctx, case PICTURE_START_CODE: /* we have a complete image: we try to decompress it */ - mpeg1_decode_picture(avctx, - buf_ptr, input_size); + if(mpeg1_decode_picture(avctx, + buf_ptr, input_size) < 0) + s2->pict_type=0; break; case EXT_START_CODE: mpeg_decode_extension(avctx, @@ -2356,6 +2373,11 @@ static int decode_chunks(AVCodecContext *avctx, break; } + if(!s2->pict_type){ + av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n"); + break; + } + if(s2->first_slice){ s2->first_slice=0; if(mpeg_field_start(s2) < 0) |