[FFmpeg-devel] [PATCH 001/293 v8] avutil/channel_layout: Add a new channel layout API

[James Almer]

On 3/15/2022 9:41 PM, Michael Niedermayer wrote:
> On Mon, Jan 24, 2022 at 05:46:56PM -0300, James Almer wrote:
>> From: Anton Khirnov <anton at khirnov.net>
>>
>> The new API is more extensible and allows for custom layouts.
>> More accurate information is exported, eg for decoders that do not
>> set a channel layout, lavc will not make one up for them.
>>
>> Deprecate the old API working with just uint64_t bitmasks.
>>
>> Expanded and completed by Vittorio Giovara <vittorio.giovara at gmail.com>
>> and James Almer <jamrial at gmail.com>.
>> Signed-off-by: Vittorio Giovara <vittorio.giovara at gmail.com>
>> Signed-off-by: James Almer <jamrial at gmail.com>
>> ---
>> Changes since last version:
>>
>> *Both av_channel_layout_describe() and av_channel_layout_from_string() now
>>   support a "2 channels (FL+LFE)" syntax, to signal native (usually
>>   non-standard) or custom order layouts.
>> *a single decimal value is now interpreted as a mask by
>>   av_channel_layout_from_string(), same as a single hexadecimal value.
>> *De-duplicated code by simplifying av_channel_layout_channel_from_string().
>>
>> The entire set can still be found in
>> https://github.com/jamrial/FFmpeg/commits/channel_layout4
>>
>>   libavutil/channel_layout.c | 661 +++++++++++++++++++++++++++++++++----
>>   libavutil/channel_layout.h | 551 +++++++++++++++++++++++++++++--
>>   libavutil/version.h        |   1 +
>>   3 files changed, 1110 insertions(+), 103 deletions(-)
> 
> didnt bisect but
> 
> this
> ./ffmpeg -i ~/tickets/3542/out.mov -channel_layout stereo -acodec pcm_s16be file.mov
> fails after the patchset but not before
> 
> [graph_0_in_0_0 @ 0x5642d659ec40] filter context - fmt: s16 r: 44100 layout: 3 ch: 2, incoming frame - fmt: s16 r: 44100 layout: 60000000 ch: 2 pts_time: 0
> [graph_0_in_0_0 @ 0x5642d659ec40] Changing audio frame properties on the fly is not supported.
> Error while filtering: Invalid argument
> Failed to inject frame into filter network: Invalid argument
> Error while processing the decoded data for stream #0:0
> Conversion failed!

Should be fixed.