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avcodec/mpeg4videodec: Split decode_studio_vol_header() out of decode_studiovisualobject() 

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-04-29 21:19:15 +02:00
parent e03bf251d8
commit 177133a0f4
1 changed files with 21 additions and 9 deletions
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26
libavcodec/mpeg4videodec.c
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@ -2983,18 +2983,26 @@ static int decode_studio_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
static int decode_studiovisualobject(Mpeg4DecContext *ctx, GetBitContext *gb)
{
MpegEncContext *s = &ctx->m;
int visual_object_type, width, height;
int visual_object_type;
skip_bits(gb, 4); /* visual_object_verid */
visual_object_type = get_bits(gb, 4);
if (visual_object_type != VOT_VIDEO_ID) {
avpriv_request_sample(s->avctx, "VO type %u", visual_object_type);
return AVERROR_PATCHWELCOME;
}
next_start_code_studio(gb);
extension_and_user_data(s, gb, 1);
if (visual_object_type == VOT_VIDEO_ID) {
/* StudioVideoObjectLayer */
skip_bits_long(gb, 32); /* video_object_start_code */
skip_bits_long(gb, 32); /* video_object_layer_start_code */
return 0;
}
static int decode_studio_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
{
MpegEncContext *s = &ctx->m;
int width, height;
skip_bits1(gb); /* random_accessible_vol */
skip_bits(gb, 8); /* video_object_type_indication */
skip_bits(gb, 4); /* video_object_layer_verid */
@ -3063,7 +3071,6 @@ static int decode_studiovisualobject(Mpeg4DecContext *ctx, GetBitContext *gb)
next_start_code_studio(gb);
extension_and_user_data(s, gb, 2);
}
return 0;
}
@ -3173,8 +3180,14 @@ 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;
break;
} else {
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) {
@ -3191,7 +3204,6 @@ int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb)
if (s->studio_profile) {
if ((ret = decode_studiovisualobject(ctx, gb)) < 0)
return ret;
break;
} else
mpeg4_decode_visual_object(s, gb);
} else if (startcode == VOP_STARTCODE) {