[FFmpeg-devel] [PATCH v8 1/3] libavdevice/avfoundation.m: use AudioConvert, extend supported formats

[Gyan Doshi]

On 2021-12-31 11:12 pm, Romain Beauxis wrote:
> * Implement support for AudioConverter
> * Switch to AudioConverter's API to convert unsupported PCM
>    formats (non-interleaved, non-packed) to supported formats
> * Minimize data copy.
>
> This fixes: https://trac.ffmpeg.org/ticket/9502
>
> API ref:
> https://developer.apple.com/documentation/audiotoolbox/audio_converter_services
>
> Signed-off-by: Romain Beauxis <toots at rastageeks.org>
> —
> [Sorry for the noise but an issue came up with the previous set]
>
> This is the first patch of a series of 3 that fix, cleanup and enhance the
> avfoundation implementation for libavdevice.
>
> These patches come from an actual user-facing application relying on
> libavdevice’s implementation of avfoundation audio input. Without them,
> Avfoundation is practically unusable as it will:
> * Refuse to process certain specific audio input format that are actually
> returned by the OS for some users (packed PCM audio)
> * Drop audio frames, resulting in corrupted audio input. This might have been
> unnoticed with video frames but this makes avfoundation essentially unusable
> for audio.
>
> The patches are now being included in our production build so they are tested
> and usable in production.
>
> Changelog for this patch:
> * v2: None
> * v3: None
> * v4: None
> * v5: Fix indentation/wrapping
> * v6: None
> * v7: Removed use of kAudioConverterPropertyCalculateOutputBufferSize
>   to calculate output buffer size. The calculation is trivial and this call was
>   randomly failing for no reason
> * v8: None

Why new versions if no changes?

Regards,
Gyan