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avcodec/mpeg4videoenc: Simplify writing startcodes 

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt 2024-04-22 02:38:23 +02:00
parent 4ef98a43ee
commit 5475000942
1 changed files with 7 additions and 14 deletions
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21
libavcodec/mpeg4videoenc.c
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@ -883,8 +883,7 @@ static void mpeg4_encode_gop_header(MpegEncContext *s)
int64_t hours, minutes, seconds;
int64_t time;
put_bits(&s->pb, 16, 0);
put_bits(&s->pb, 16, GOP_STARTCODE);
put_bits32(&s->pb, GOP_STARTCODE);
time = s->cur_pic.ptr->f->pts;
if (s->reordered_input_picture[1])
@ -933,13 +932,11 @@ static void mpeg4_encode_visual_object_header(MpegEncContext *s)
// FIXME levels
put_bits(&s->pb, 16, 0);
put_bits(&s->pb, 16, VOS_STARTCODE);
put_bits32(&s->pb, VOS_STARTCODE);
put_bits(&s->pb, 8, profile_and_level_indication);
put_bits(&s->pb, 16, 0);
put_bits(&s->pb, 16, VISUAL_OBJ_STARTCODE);
put_bits32(&s->pb, VISUAL_OBJ_STARTCODE);
put_bits(&s->pb, 1, 1);
put_bits(&s->pb, 4, vo_ver_id);
@ -966,10 +963,8 @@ static void mpeg4_encode_vol_header(MpegEncContext *s,
vo_type = SIMPLE_VO_TYPE;
}
put_bits(&s->pb, 16, 0);
put_bits(&s->pb, 16, 0x100 + vo_number); /* video obj */
put_bits(&s->pb, 16, 0);
put_bits(&s->pb, 16, 0x120 + vol_number); /* video obj layer */
put_bits32(&s->pb, 0x100 + vo_number); /* video obj */
put_bits32(&s->pb, 0x120 + vol_number); /* video obj layer */
put_bits(&s->pb, 1, 0); /* random access vol */
put_bits(&s->pb, 8, vo_type); /* video obj type indication */
@ -1046,8 +1041,7 @@ static void mpeg4_encode_vol_header(MpegEncContext *s,
/* user data */
if (!(s->avctx->flags & AV_CODEC_FLAG_BITEXACT)) {
put_bits(&s->pb, 16, 0);
put_bits(&s->pb, 16, 0x1B2); /* user_data */
put_bits32(&s->pb, USER_DATA_STARTCODE);
ff_put_string(&s->pb, LIBAVCODEC_IDENT, 0);
}
}
@ -1071,8 +1065,7 @@ int ff_mpeg4_encode_picture_header(MpegEncContext *s)
s->partitioned_frame = s->data_partitioning && s->pict_type != AV_PICTURE_TYPE_B;
put_bits(&s->pb, 16, 0); /* vop header */
put_bits(&s->pb, 16, VOP_STARTCODE); /* vop header */
put_bits32(&s->pb, VOP_STARTCODE); /* vop header */
put_bits(&s->pb, 2, s->pict_type - 1); /* pict type: I = 0 , P = 1 */
time_div = FFUDIV(s->time, s->avctx->time_base.den);