[FFmpeg-devel] [PATCH 1/2] avformat/vividas: simplify, use av_rescale_q() instead

[lance.lmwang at gmail.com]

On Tue, Apr 28, 2020 at 11:49:16AM +0800, lance.lmwang at gmail.com wrote:
> From: Limin Wang <lance.lmwang at gmail.com>
> 
> note it'll cause a small difference in accuracy for the pts, please see the testing result below:
>  $ wget http://samples.ffmpeg.org/archive/all/unknown+unknown+unknown+unknown+5029_paramount_en_1250.viv
>  $ ./ffmpeg -t 0.04 -i ./unknown+unknown+unknown+unknown+5029_paramount_en_1250.viv -f null -
>  old:
>  pts: 522
>  pts: 1044
>  pts: 1567
>  pts: 3918
>  pts: 8097
>  pts: 12277
>  pts: 16457
>  ...
> 
>  new:
>  pts: 522
>  pts: 1045
>  pts: 1567
>  pts: 3918
>  pts: 8098
>  pts: 12278
>  pts: 16457
>  ...
> 
> Signed-off-by: Limin Wang <lance.lmwang at gmail.com>
> ---
>  libavformat/vividas.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/libavformat/vividas.c b/libavformat/vividas.c
> index 4f54a4302e..b0f9f35ac2 100644
> --- a/libavformat/vividas.c
> +++ b/libavformat/vividas.c
> @@ -646,7 +646,7 @@ static int viv_read_packet(AVFormatContext *s,
>          pkt->stream_index = 1;
>          astream = s->streams[pkt->stream_index];
>  
> -        pkt->pts = av_rescale(viv->audio_sample, astream->time_base.den, astream->time_base.num) / astream->codecpar->sample_rate;
> +        pkt->pts = av_rescale_q(viv->audio_sample, av_make_q(1, astream->codecpar->sample_rate), astream->time_base);
>          viv->audio_sample += viv->audio_subpackets[viv->current_audio_subpacket].pcm_bytes / 2 / astream->codecpar->channels;
>          pkt->flags |= AV_PKT_FLAG_KEY;
>          viv->current_audio_subpacket++;
> -- 
> 2.21.0
> 

will apply the patchset tomorrow.

-- 
Thanks,
Limin Wang