[FFmpeg-devel] [PATCH] flv: fix stereo flag when writing PCMA/PCMU

[aler9]

 Hello again, i'm bumping this patch since currently it's impossible to
stream 16khz or stereo G711 tracks with RTMP, as these are always marked as
8khz, mono tracks.
Please consider merging. Thanks.


Il giorno dom 21 gen 2024 alle ore 16:16 Alessandro Ros <aler9.dev at gmail.com>
ha scritto:

> Currently, when writing PCMA or PCMU tracks with FLV or RTMP, the
> stereo flag and sample rate flag inside RTMP audio messages are
> overridden, making impossible to distinguish between mono and stereo
> tracks. This patch fixes the issue by restoring the same flag mechanism
> of all other codecs, that takes into consideration the right channel
> count and sample rate.
>
> Signed-off-by: Alessandro Ros <aler9.dev at gmail.com>
> ---
>  libavformat/flvenc.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/libavformat/flvenc.c b/libavformat/flvenc.c
> index 874560fac1..772d891136 100644
> --- a/libavformat/flvenc.c
> +++ b/libavformat/flvenc.c
> @@ -208,10 +208,10 @@ error:
>              flags |= FLV_CODECID_NELLYMOSER            |
> FLV_SAMPLESSIZE_16BIT;
>          break;
>      case AV_CODEC_ID_PCM_MULAW:
> -        flags = FLV_CODECID_PCM_MULAW | FLV_SAMPLERATE_SPECIAL |
> FLV_SAMPLESSIZE_16BIT;
> +        flags |= FLV_CODECID_PCM_MULAW | FLV_SAMPLESSIZE_16BIT;
>          break;
>      case AV_CODEC_ID_PCM_ALAW:
> -        flags = FLV_CODECID_PCM_ALAW  | FLV_SAMPLERATE_SPECIAL |
> FLV_SAMPLESSIZE_16BIT;
> +        flags |= FLV_CODECID_PCM_ALAW | FLV_SAMPLESSIZE_16BIT;
>          break;
>      case 0:
>          flags |= par->codec_tag << 4;
> --
> 2.34.1
>
>