[FFmpeg-devel] [PATCH] lavc: export flag for MPEG audio dual channel

[Rémi Denis-Courmont]

Le keskiviikkona 21. syyskuuta 2022, 22.26.11 EEST Scott Theisen a écrit :
> diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
> index 7db5d1b1c5..bcf3a845a8 100644
> --- a/libavcodec/avcodec.h
> +++ b/libavcodec/avcodec.h
> @@ -2076,6 +2076,17 @@ typedef struct AVCodecContext {
>       *             The decoder can then override during decoding as needed.
> */
>      AVChannelLayout ch_layout;
> +
> +    /**
> +     * Audio only.  This flag is set when MPEG audio mode dual channel has
> been detected. +     * This signals that the audio is two independent mono
> channels. +     *
> +     * 0 normally, 1 if dual channel flag is set.
> +     *
> +     * - encoding: currently unused (functionally equivalent to stereo,
> patch welcome) +     * - decoding: set by lavc
> +     */
> +    int mpeg_audio_mode_dual_channel;
>  } AVCodecContext;

I agree that the dual mono flag should be exposed to the application somehow, 
but isn't this a slient ABI break?

-- 
Rémi Denis-Courmont
http://www.remlab.net/