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avcodec/mpeg12enc: Partially inline whether codec is MPEG-1

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MPEG-1 only supports 4:2:0, so one can optimize away the checks
for whether one encodes MPEG-1 in codepaths that encode 4:2:2.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt 2021-12-25 02:38:59 +01:00
parent d91b5020ec
commit c037f3fc7d
1 changed files with 3 additions and 1 deletions
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4
libavcodec/mpeg12enc.c
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@ -776,6 +776,8 @@ static av_always_inline void mpeg1_encode_mb_internal(MpegEncContext *s,
int mb_block_count,
int chroma_y_shift)
{
/* MPEG-1 is always 420. */
#define IS_MPEG1(s) (chroma_y_shift == 1 && (s)->codec_id == AV_CODEC_ID_MPEG1VIDEO)
int i, cbp;
const int mb_x = s->mb_x;
const int mb_y = s->mb_y;
@ -789,7 +791,7 @@ static av_always_inline void mpeg1_encode_mb_internal(MpegEncContext *s,
if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
(mb_x != s->mb_width - 1 ||
(mb_y != s->end_mb_y - 1 && s->codec_id == AV_CODEC_ID_MPEG1VIDEO)) &&
(mb_y != s->end_mb_y - 1 && IS_MPEG1(s))) &&
((s->pict_type == AV_PICTURE_TYPE_P && (motion_x | motion_y) == 0) ||
(s->pict_type == AV_PICTURE_TYPE_B && s->mv_dir == s->last_mv_dir &&
(((s->mv_dir & MV_DIR_FORWARD)