Re: [FFmpeg-devel] [PATCH] avcodec/adpcm: adpcm_dtk is stereo only

[James Almer <jamrial@gmail.com>]

On 8/12/2024 2:55 PM, Andreas Rheinhardt wrote:
> James Almer:
>> Fixes ticket #11133
>>
>> Signed-off-by: James Almer <jamrial@gmail.com>
>> ---
>>   libavcodec/adpcm.c | 5 ++++-
>>   1 file changed, 4 insertions(+), 1 deletion(-)
>>
>> diff --git a/libavcodec/adpcm.c b/libavcodec/adpcm.c
>> index 8d358bc414..623d33fd02 100644
>> --- a/libavcodec/adpcm.c
>> +++ b/libavcodec/adpcm.c
>> @@ -276,6 +276,9 @@ static av_cold int adpcm_decode_init(AVCodecContext * avctx)
>>               return AVERROR_PATCHWELCOME;
>>           }
>>           break;
>> +    case AV_CODEC_ID_ADPCM_DTK:
>> +        min_channels = 2;
>> +        break;
>>       case AV_CODEC_ID_ADPCM_PSX:
>>           max_channels = 8;
>>           if (avctx->ch_layout.nb_channels <= 0 ||
>> @@ -1047,7 +1050,7 @@ static int get_nb_samples(AVCodecContext *avctx, GetByteContext *gb,
>>           break;
>>       case AV_CODEC_ID_ADPCM_DTK:
>>       case AV_CODEC_ID_ADPCM_PSX:
>> -        nb_samples = buf_size / (16 * ch) * 28;
>> +        nb_samples = buf_size / 32 * 28;
> 
> This also changes AV_CODEC_ID_ADPCM_PSX; given that its max_channels is
> 8, this does not seem intended.

Will fix.

> 
>>           break;
>>       case AV_CODEC_ID_ADPCM_ARGO:
>>           nb_samples = buf_size / avctx->block_align * 32;
> 
> Who says that adpcm_dtk is stereo-only?

It's an audio format only used in a bunch of GameCube games, and nothing 
but stereo samples exist of it.
The frames also have a header with per-channel information, and it's 
always for two.

> 
> - Andreas
> 
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