Receive-side ready for multiple channels.
Made path from NetEq to AudioTransport ready for many-channel audio.
If there is one stream, we can handle anything that fits in an
AudioFrame. For many streams, the current limit is 6.
Some multi-channel combinations are not supported: e.g. if we get
stereo audio and attempt to play out 6 channels.
Changes:
* AudioFrameOperations - replaced the MonoTo* and *ToMono methods by
UpmixChannels & DownmixChannels.
* AudioMixer: removed DCHECKs for <= 2 channels and tweaked the mixing
algorithm to handle many channels.
Bug: webrtc:8649
Change-Id: Ib83e16d463694e35658caa09c27849e853d508fb
Reviewed-on: https://webrtc-review.googlesource.com/c/106040
Reviewed-by: Oskar Sundbom <ossu@webrtc.org>
Commit-Queue: Alex Loiko <aleloi@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#26446}diff --git a/modules/audio_mixer/frame_combiner.h b/modules/audio_mixer/frame_combiner.h
index 1c1cd53..d989d02 100644
--- a/modules/audio_mixer/frame_combiner.h
+++ b/modules/audio_mixer/frame_combiner.h
@@ -38,12 +38,20 @@
size_t number_of_streams,
AudioFrame* audio_frame_for_mixing);
+ // Stereo, 48 kHz, 10 ms.
+ static constexpr size_t kMaximumNumberOfChannels = 8;
+ static constexpr size_t kMaximumChannelSize = 48 * 10;
+
+ using MixingBuffer = std::array<std::array<float, kMaximumChannelSize>,
+ kMaximumNumberOfChannels>;
+
private:
void LogMixingStats(const std::vector<AudioFrame*>& mix_list,
int sample_rate,
size_t number_of_streams) const;
std::unique_ptr<ApmDataDumper> data_dumper_;
+ std::unique_ptr<MixingBuffer> mixing_buffer_;
Limiter limiter_;
const bool use_limiter_;
mutable int uma_logging_counter_ = 0;