Re: [FFmpeg-devel] [PATCH] avutil/channel_layout: don't clear the opaque pointer on type conversion

[James Almer <jamrial@gmail.com>]

On 3/22/2024 1:01 PM, James Almer wrote:
> Otherwise it would not be lossless.
> 
> Signed-off-by: James Almer <jamrial@gmail.com>
> ---
>   libavutil/channel_layout.c | 8 ++++++++
>   1 file changed, 8 insertions(+)
> 
> diff --git a/libavutil/channel_layout.c b/libavutil/channel_layout.c
> index a83618bcc7..3054ee08a5 100644
> --- a/libavutil/channel_layout.c
> +++ b/libavutil/channel_layout.c
> @@ -902,9 +902,11 @@ int av_channel_layout_retype(AVChannelLayout *channel_layout, enum AVChannelOrde
>               lossy = 1;
>           }
>           if (!lossy || allow_lossy) {
> +            void *opaque = channel_layout->opaque;
>               av_channel_layout_uninit(channel_layout);
>               channel_layout->order       = AV_CHANNEL_ORDER_UNSPEC;
>               channel_layout->nb_channels = nb_channels;
> +            channel_layout->opaque      = opaque;
>               return lossy;
>           }
>           return AVERROR(ENOSYS);
> @@ -916,8 +918,10 @@ int av_channel_layout_retype(AVChannelLayout *channel_layout, enum AVChannelOrde
>                   return AVERROR(ENOSYS);
>               lossy = has_channel_names(channel_layout);
>               if (!lossy || allow_lossy) {
> +                void *opaque = channel_layout->opaque;
>                   av_channel_layout_uninit(channel_layout);
>                   av_channel_layout_from_mask(channel_layout, mask);
> +                channel_layout->opaque = opaque;
>                   return lossy;
>               }
>           }
> @@ -925,6 +929,7 @@ int av_channel_layout_retype(AVChannelLayout *channel_layout, enum AVChannelOrde
>       case AV_CHANNEL_ORDER_CUSTOM: {
>           AVChannelLayout custom = { 0 };
>           int ret = av_channel_layout_custom_init(&custom, channel_layout->nb_channels);
> +        void *opaque = channel_layout->opaque;
>           if (ret < 0)
>               return ret;
>           if (channel_layout->order != AV_CHANNEL_ORDER_UNSPEC)
> @@ -932,6 +937,7 @@ int av_channel_layout_retype(AVChannelLayout *channel_layout, enum AVChannelOrde
>                   custom.u.map[i].id = av_channel_layout_channel_from_index(channel_layout, i);
>           av_channel_layout_uninit(channel_layout);
>           *channel_layout = custom;
> +        channel_layout->opaque = opaque;
>           return 0;
>           }
>       case AV_CHANNEL_ORDER_AMBISONIC:
> @@ -946,10 +952,12 @@ int av_channel_layout_retype(AVChannelLayout *channel_layout, enum AVChannelOrde
>                   return AVERROR(ENOSYS);
>               lossy = has_channel_names(channel_layout);
>               if (!lossy || allow_lossy) {
> +                void *opaque = channel_layout->opaque;
>                   av_channel_layout_uninit(channel_layout);
>                   channel_layout->order       = AV_CHANNEL_ORDER_AMBISONIC;
>                   channel_layout->nb_channels = nb_channels;
>                   channel_layout->u.mask      = mask;
> +                channel_layout->opaque      = opaque;
>                   return lossy;
>               }
>           }

Will apply.
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