/usr/include/thunderbird/AudioChannelFormat.h is in thunderbird-dev 1:38.6.0+build1-0ubuntu1.
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef MOZILLA_AUDIOCHANNELFORMAT_H_
#define MOZILLA_AUDIOCHANNELFORMAT_H_
#include <stdint.h>
#include "nsTArrayForwardDeclare.h"
namespace mozilla {
/*
* This file provides utilities for upmixing and downmixing channels.
*
* The channel layouts, upmixing and downmixing are consistent with the
* Web Audio spec.
*
* Channel layouts for up to 6 channels:
* mono { M }
* stereo { L, R }
* { L, R, C }
* quad { L, R, SL, SR }
* { L, R, C, SL, SR }
* 5.1 { L, R, C, LFE, SL, SR }
*
* Only 1, 2, 4 and 6 are currently defined in Web Audio.
*/
/**
* Return a channel count whose channel layout includes all the channels from
* aChannels1 and aChannels2.
*/
uint32_t
GetAudioChannelsSuperset(uint32_t aChannels1, uint32_t aChannels2);
/**
* Given an array of input channel data, and an output channel count,
* replaces the array with an array of upmixed channels.
* This shuffles the array and may set some channel buffers to aZeroChannel.
* Don't call this with input count >= output count.
* This may return *more* channels than requested. In that case, downmixing
* is required to to get to aOutputChannelCount. (This is how we handle
* odd cases like 3 -> 4 upmixing.)
* If aChannelArray.Length() was the input to one of a series of
* GetAudioChannelsSuperset calls resulting in aOutputChannelCount,
* no downmixing will be required.
*/
void
AudioChannelsUpMix(nsTArray<const void*>* aChannelArray,
uint32_t aOutputChannelCount,
const void* aZeroChannel);
/**
* Given an array of input channels (which must be float format!),
* downmix to aOutputChannelCount, and copy the results to the
* channel buffers in aOutputChannels.
* Don't call this with input count <= output count.
*/
void
AudioChannelsDownMix(const nsTArray<const void*>& aChannelArray,
float** aOutputChannels,
uint32_t aOutputChannelCount,
uint32_t aDuration);
// A version of AudioChannelsDownMix that downmixes int16_ts may be required.
} // namespace mozilla
#endif /* MOZILLA_AUDIOCHANNELFORMAT_H_ */
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