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avcodec/mpeg4video: Detect reference studio streams as studio streams

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Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-04-29 23:39:41 +02:00
parent b3a18511cc
commit ba97d75ac6
2 changed files with 25 additions and 9 deletions
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2
libavcodec/mpeg4video.h
View File

@ -41,6 +41,8 @@
#define NBIT_VO_TYPE 5
#define ARTS_VO_TYPE 10
#define ACE_VO_TYPE 12
#define SIMPLE_STUDIO_VO_TYPE 14
#define CORE_STUDIO_VO_TYPE 15
#define ADV_SIMPLE_VO_TYPE 17
#define VOT_VIDEO_ID 1

32
libavcodec/mpeg4videodec.c
View File

@ -46,6 +46,8 @@
#define MB_TYPE_B_VLC_BITS 4
#define STUDIO_INTRA_BITS 9
static int decode_studio_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb);
static VLC dc_lum, dc_chrom;
static VLC sprite_trajectory;
static VLC mb_type_b_vlc;
@ -2049,6 +2051,23 @@ static int decode_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
/* vol header */
skip_bits(gb, 1); /* random access */
s->vo_type = get_bits(gb, 8);
/* If we are in studio profile (per vo_type), check if its all consistent
* and if so continue pass control to decode_studio_vol_header().
* elIf something is inconsistent, error out
* else continue with (non studio) vol header decpoding.
*/
if (s->vo_type == CORE_STUDIO_VO_TYPE ||
s->vo_type == SIMPLE_STUDIO_VO_TYPE) {
if (s->avctx->profile != FF_PROFILE_UNKNOWN && s->avctx->profile != FF_PROFILE_MPEG4_SIMPLE_STUDIO)
return AVERROR_INVALIDDATA;
s->studio_profile = 1;
s->avctx->profile = FF_PROFILE_MPEG4_SIMPLE_STUDIO;
return decode_studio_vol_header(ctx, gb);
} else if (s->studio_profile) {
return AVERROR_PATCHWELCOME;
}
if (get_bits1(gb) != 0) { /* is_ol_id */
vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
skip_bits(gb, 3); /* vo_priority */
@ -3001,8 +3020,8 @@ static int decode_studio_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
int width, height;
int bits_per_raw_sample;
skip_bits1(gb); /* random_accessible_vol */
skip_bits(gb, 8); /* video_object_type_indication */
// random_accessible_vol and video_object_type_indication have already
// been read by the caller decode_vol_header()
skip_bits(gb, 4); /* video_object_layer_verid */
ctx->shape = get_bits(gb, 2); /* video_object_layer_shape */
skip_bits(gb, 4); /* video_object_layer_shape_extension */
@ -3179,13 +3198,8 @@ int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb)
continue;
}
vol++;
if (s->studio_profile) {
if ((ret = decode_studio_vol_header(ctx, gb)) < 0)
return ret;
} else {
if ((ret = decode_vol_header(ctx, gb)) < 0)
return ret;
}
if ((ret = decode_vol_header(ctx, gb)) < 0)
return ret;
} else if (startcode == USER_DATA_STARTCODE) {
decode_user_data(ctx, gb);
} else if (startcode == GOP_STARTCODE) {