> On Apr 19, 2022, at 1:12 PM, Zhao Zhili <quinkbl...@foxmail.com> wrote:
>
> ff_codec_get_id loops over ff_codec_movvideo_tags (which is a large
> array) two times. The result is unused most of the cases.
> ---
> libavformat/mov.c | 4 +---
> 1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/libavformat/mov.c b/libavformat/mov.c
> index 6c847de164..bdc8c84bae 100644
> --- a/libavformat/mov.c
> +++ b/libavformat/mov.c
> @@ -2487,8 +2487,6 @@ static int mov_skip_multiple_stsd(MOVContext *c,
> AVIOContext *pb,
> int codec_tag, int format,
> int64_t size)
> {
> - int video_codec_id = ff_codec_get_id(ff_codec_movvideo_tags, format);
> -
> if (codec_tag &&
> (codec_tag != format &&
> // AVID 1:1 samples with differing data format and codec tag exist
> @@ -2497,7 +2495,7 @@ static int mov_skip_multiple_stsd(MOVContext *c,
> AVIOContext *pb,
> codec_tag != AV_RL32("apcn") && codec_tag != AV_RL32("apch") &&
> // so is dv (sigh)
> codec_tag != AV_RL32("dvpp") && codec_tag != AV_RL32("dvcp") &&
> - (c->fc->video_codec_id ? video_codec_id != c->fc->video_codec_id
> + (c->fc->video_codec_id ? ff_codec_get_id(ff_codec_movvideo_tags,
> format) != c->fc->video_codec_id
> : codec_tag != MKTAG('j','p','e','g')))) {
> /* Multiple fourcc, we skip JPEG. This is not correct, we should
> * export it as a separate AVStream but this needs a few changes
> --
> 2.35.3
>
Do we care about such micro-optimization, or just let compiler do it’s job?
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