[FFmpeg-devel] [PATCH 1/1] avcodec/pcm: fix build warning by replacing deprecated method with avcodec_get_supported_config.

[Zhao Zhili]

> On Mar 11, 2025, at 17:25, joneyao6 at gmail.com wrote:
> 
> From: Jingwei Yao <joneyao6 at gmail.com>
> 
> Signed-off-by: Jingwei Yao <joneyao6 at gmail.com>
> ---
> libavcodec/pcm.c | 12 ++++++++++--
> 1 file changed, 10 insertions(+), 2 deletions(-)
> 
> diff --git a/libavcodec/pcm.c b/libavcodec/pcm.c
> index a23293dca2..e04ca78101 100644
> --- a/libavcodec/pcm.c
> +++ b/libavcodec/pcm.c
> @@ -252,8 +252,10 @@ typedef struct PCMDecode {
> static av_cold int pcm_decode_init(AVCodecContext *avctx)
> {
>     PCMDecode *s = avctx->priv_data;
> +    const enum AVSampleFormat *sample_fmts;
>     AVFloatDSPContext *fdsp;
> -    int i;
> +    int num_sample_fmts;
> +    int i, ret;
> 
>     switch (avctx->codec_id) {
>     case AV_CODEC_ID_PCM_ALAW:
> @@ -284,7 +286,13 @@ static av_cold int pcm_decode_init(AVCodecContext *avctx)
>         break;
>     }
> 
> -    avctx->sample_fmt = avctx->codec->sample_fmts[0];
> +    ret = avcodec_get_supported_config(avctx, NULL, AV_CODEC_CONFIG_SAMPLE_FORMAT,
> +                                       0, (const void**)&sample_fmts, &num_sample_fmts);
> +    if (ret < 0)
> +        return ret;
> +
> +    if (sample_fmts)
> +        avctx->sample_fmt = sample_fmts[0];

How about just disable the warning with FF_DISABLE_DEPRECATION_WARNINGS?

sample_fmts should be moved to FFCodec finally. So we can fix it finally by

    avctx->sample_fmt = ffcodec(avctx->codec)->sample_fmts[0];

It doesn’t worth the trouble and complexity to get some information which is only an array
in current translation unit.

> 
>     if (avctx->sample_fmt == AV_SAMPLE_FMT_S32)
>         avctx->bits_per_raw_sample = av_get_bits_per_sample(avctx->codec_id);
> -- 
> 2.25.1
> 
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