[FFmpeg-devel] [PATCH] use bits_per_coded_sample if bits_per_raw_sample equal to 0 in pcmc tag, fix bug #10433

["zhilizhao(赵志立)"]

> On Jul 24, 2023, at 10:41, hung kuishing <hungkuishing at outlook.com> wrote:
> 
> Signed-off-by: clarkh <hungkuishing at outlook.com>
> ---
> libavformat/movenc.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/libavformat/movenc.c b/libavformat/movenc.c
> index f1cc80b1b3..d08c056438 100644
> --- a/libavformat/movenc.c
> +++ b/libavformat/movenc.c
> @@ -1237,7 +1237,7 @@ static int mov_write_pcmc_tag(AVFormatContext *s, AVIOContext *pb, MOVTrack *tra
>                     track->par->codec_id == AV_CODEC_ID_PCM_S24LE ||
>                     track->par->codec_id == AV_CODEC_ID_PCM_S32LE);
>     avio_w8(pb, format_flags);
> -    avio_w8(pb, track->par->bits_per_raw_sample);
> +    avio_w8(pb, track->par->bits_per_raw_sample ? track->par->bits_per_raw_sample : track->par->bits_per_coded_sample);

Thanks for the bug report. I didn’t notice bits_per_raw_sample isn’t available
when remux raw PCM. It looks like a defect but I’m not sure.

Since both bits_per_raw_sample and bits_per_coded_sample can be 0 as the
comments in codec_par.h says, I decided to fallback to
av_get_exact_bits_per_sample().

http://ffmpeg.org/pipermail/ffmpeg-devel/2023-July/312653.html

PS: Please follow the commit message format next time:

2.10 Writing a commit message
https://ffmpeg.org/git-howto.html#Writing-a-commit-message

> 
>     return update_size(pb, pos);
> }
> -- 
> 2.39.2 (Apple Git-143)
> 
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