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avcodec/mpegvideo_dec: Set dct_unquantize ptrs only once when possible

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Everything except dct_unquantize_intra for MPEG-4 need only
be set once.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Andreas Rheinhardt 2024-06-02 07:22:48 +02:00 committed by Paul B Mahol
parent 64f0b12b07
commit 03517b4743
2 changed files with 15 additions and 14 deletions
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8
libavcodec/h263dec.c
View File

@ -110,6 +110,9 @@ av_cold int ff_h263_decode_init(AVCodecContext *avctx)
avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
break;
case AV_CODEC_ID_MPEG4:
// dct_unquantize_inter is only used with MPEG-2 quantizers,
// so we can already set dct_unquantize_inter here once and for all.
s->dct_unquantize_inter = s->dct_unquantize_mpeg2_inter;
break;
case AV_CODEC_ID_MSMPEG4V1:
s->h263_pred = 1;
@ -523,6 +526,11 @@ retry:
goto retry;
if (s->studio_profile != (s->idsp.idct == NULL))
ff_mpv_idct_init(s);
if (s->mpeg_quant) {
s->dct_unquantize_intra = s->dct_unquantize_mpeg2_intra;
} else {
s->dct_unquantize_intra = s->dct_unquantize_h263_intra;
}
}
/* After H.263 & MPEG-4 header decode we have the height, width,

21
libavcodec/mpegvideo_dec.c
View File

@ -59,6 +59,13 @@ int ff_mpv_decode_init(MpegEncContext *s, AVCodecContext *avctx)
s->codec_tag = ff_toupper4(avctx->codec_tag);
ff_mpv_idct_init(s);
// dct_unquantize defaults for H.261 and H.263;
// they might change on a per-frame basis for MPEG-4.
// Unused by the MPEG-1/2 decoders.
s->dct_unquantize_intra = s->dct_unquantize_h263_intra;
s->dct_unquantize_inter = s->dct_unquantize_h263_inter;
ff_h264chroma_init(&s->h264chroma, 8); //for lowres
if (s->picture_pool) // VC-1 can call this multiple times
@ -393,20 +400,6 @@ int ff_mpv_frame_start(MpegEncContext *s, AVCodecContext *avctx)
if (ret < 0)
return ret;
/* set dequantizer, we can't do it during init as
* it might change for MPEG-4 and we can't do it in the header
* decode as init is not called for MPEG-4 there yet */
if (s->mpeg_quant || s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
s->dct_unquantize_intra = s->dct_unquantize_mpeg2_intra;
s->dct_unquantize_inter = s->dct_unquantize_mpeg2_inter;
} else if (s->out_format == FMT_H263 || s->out_format == FMT_H261) {
s->dct_unquantize_intra = s->dct_unquantize_h263_intra;
s->dct_unquantize_inter = s->dct_unquantize_h263_inter;
} else {
s->dct_unquantize_intra = s->dct_unquantize_mpeg1_intra;
s->dct_unquantize_inter = s->dct_unquantize_mpeg1_inter;
}
if (s->avctx->debug & FF_DEBUG_NOMC)
color_frame(s->cur_pic.ptr->f, 0x80);