mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
synced 2024-09-13 09:24:08 -07:00
228 lines
8.7 KiB
C++
228 lines
8.7 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* 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/. */
|
|
|
|
#include "AudioChannelFormat.h"
|
|
|
|
#include <algorithm>
|
|
|
|
namespace mozilla {
|
|
|
|
enum {
|
|
SURROUND_L,
|
|
SURROUND_R,
|
|
SURROUND_C,
|
|
SURROUND_LFE,
|
|
SURROUND_SL,
|
|
SURROUND_SR
|
|
};
|
|
|
|
static const uint32_t CUSTOM_CHANNEL_LAYOUTS = 6;
|
|
|
|
uint32_t
|
|
GetAudioChannelsSuperset(uint32_t aChannels1, uint32_t aChannels2)
|
|
{
|
|
if (aChannels1 == 3 && aChannels2 == 4) {
|
|
// quad layout has no center channel, but input has a center channel as well
|
|
// as L and R, so we actually need a 5-channel layout here.
|
|
return 5;
|
|
}
|
|
return std::max(aChannels1, aChannels2);
|
|
}
|
|
|
|
void
|
|
AudioChannelsUpMix(nsTArray<const void*>* aChannelArray,
|
|
uint32_t aOutputChannelCount,
|
|
const void* aZeroChannel)
|
|
{
|
|
uint32_t inputChannelCount = aChannelArray->Length();
|
|
uint32_t outputChannelCount =
|
|
GetAudioChannelsSuperset(aOutputChannelCount, inputChannelCount);
|
|
NS_ASSERTION(outputChannelCount > inputChannelCount,
|
|
"No up-mix needed");
|
|
NS_ASSERTION(inputChannelCount > 0, "Bad number of channels");
|
|
NS_ASSERTION(outputChannelCount > 0, "Bad number of channels");
|
|
|
|
aChannelArray->SetLength(outputChannelCount);
|
|
|
|
if (inputChannelCount < CUSTOM_CHANNEL_LAYOUTS) {
|
|
const void* surroundChannels[CUSTOM_CHANNEL_LAYOUTS] =
|
|
{ aZeroChannel, aZeroChannel, aZeroChannel,
|
|
aZeroChannel, aZeroChannel, aZeroChannel
|
|
};
|
|
// First just map everything up to 5.1
|
|
switch (inputChannelCount) {
|
|
case 1:
|
|
surroundChannels[SURROUND_C] = aChannelArray->ElementAt(0);
|
|
break;
|
|
case 2:
|
|
surroundChannels[SURROUND_L] = aChannelArray->ElementAt(0);
|
|
surroundChannels[SURROUND_R] = aChannelArray->ElementAt(1);
|
|
break;
|
|
case 3:
|
|
surroundChannels[SURROUND_L] = aChannelArray->ElementAt(0);
|
|
surroundChannels[SURROUND_R] = aChannelArray->ElementAt(1);
|
|
surroundChannels[SURROUND_C] = aChannelArray->ElementAt(2);
|
|
break;
|
|
case 4:
|
|
surroundChannels[SURROUND_L] = aChannelArray->ElementAt(0);
|
|
surroundChannels[SURROUND_R] = aChannelArray->ElementAt(1);
|
|
surroundChannels[SURROUND_SL] = aChannelArray->ElementAt(2);
|
|
surroundChannels[SURROUND_SR] = aChannelArray->ElementAt(3);
|
|
break;
|
|
case 5:
|
|
surroundChannels[SURROUND_L] = aChannelArray->ElementAt(0);
|
|
surroundChannels[SURROUND_R] = aChannelArray->ElementAt(1);
|
|
surroundChannels[SURROUND_C] = aChannelArray->ElementAt(2);
|
|
surroundChannels[SURROUND_SL] = aChannelArray->ElementAt(3);
|
|
surroundChannels[SURROUND_SR] = aChannelArray->ElementAt(4);
|
|
break;
|
|
}
|
|
|
|
if (outputChannelCount < CUSTOM_CHANNEL_LAYOUTS) {
|
|
// Map back to aOutputChannelCount
|
|
switch (outputChannelCount) {
|
|
case 2:
|
|
// Upmix from mono, so use the center channel.
|
|
aChannelArray->ElementAt(0) = surroundChannels[SURROUND_C];
|
|
aChannelArray->ElementAt(1) = surroundChannels[SURROUND_C];
|
|
break;
|
|
case 3:
|
|
aChannelArray->ElementAt(0) = surroundChannels[SURROUND_L];
|
|
aChannelArray->ElementAt(1) = surroundChannels[SURROUND_R];
|
|
aChannelArray->ElementAt(2) = surroundChannels[SURROUND_C];
|
|
break;
|
|
case 4:
|
|
// We avoided this case up above.
|
|
NS_ASSERTION(inputChannelCount != 3,
|
|
"3->4 upmix not supported directly");
|
|
if (inputChannelCount == 1) {
|
|
// Output has no center channel, so map the mono to
|
|
// L+R channels per Web Audio
|
|
aChannelArray->ElementAt(0) = surroundChannels[SURROUND_C];
|
|
aChannelArray->ElementAt(1) = surroundChannels[SURROUND_C];
|
|
} else {
|
|
aChannelArray->ElementAt(0) = surroundChannels[SURROUND_L];
|
|
aChannelArray->ElementAt(1) = surroundChannels[SURROUND_R];
|
|
}
|
|
aChannelArray->ElementAt(2) = surroundChannels[SURROUND_SL];
|
|
aChannelArray->ElementAt(3) = surroundChannels[SURROUND_SR];
|
|
break;
|
|
case 5:
|
|
aChannelArray->ElementAt(0) = surroundChannels[SURROUND_L];
|
|
aChannelArray->ElementAt(1) = surroundChannels[SURROUND_R];
|
|
aChannelArray->ElementAt(2) = surroundChannels[SURROUND_C];
|
|
aChannelArray->ElementAt(3) = surroundChannels[SURROUND_SL];
|
|
aChannelArray->ElementAt(4) = surroundChannels[SURROUND_SR];
|
|
}
|
|
return;
|
|
}
|
|
|
|
memcpy(aChannelArray->Elements(), surroundChannels, sizeof(surroundChannels));
|
|
inputChannelCount = CUSTOM_CHANNEL_LAYOUTS;
|
|
}
|
|
|
|
for (uint32_t i = inputChannelCount; i < outputChannelCount; ++i) {
|
|
aChannelArray->ElementAt(i) = aZeroChannel;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* DownMixMatrix represents a conversion matrix efficiently by exploiting the
|
|
* fact that each input channel contributes to at most one output channel,
|
|
* except possibly for the C input channel in layouts that have one. Also,
|
|
* every input channel is multiplied by the same coefficient for every output
|
|
* channel it contributes to.
|
|
*/
|
|
struct DownMixMatrix {
|
|
// Every input channel c is copied to output channel mInputDestination[c]
|
|
// after multiplying by mInputCoefficient[c].
|
|
uint8_t mInputDestination[CUSTOM_CHANNEL_LAYOUTS];
|
|
// If not IGNORE, then the C channel is copied to this output channel after
|
|
// multiplying by its coefficient.
|
|
uint8_t mCExtraDestination;
|
|
float mInputCoefficient[CUSTOM_CHANNEL_LAYOUTS];
|
|
};
|
|
|
|
static const int IGNORE = CUSTOM_CHANNEL_LAYOUTS;
|
|
static const float IGNORE_F = 0.0f;
|
|
|
|
static const DownMixMatrix
|
|
gDownMixMatrices[CUSTOM_CHANNEL_LAYOUTS*(CUSTOM_CHANNEL_LAYOUTS - 1)/2] =
|
|
{
|
|
// Downmixes to mono
|
|
{ { 0, 0 }, IGNORE, { 0.5f, 0.5f } },
|
|
{ { 0, 0, 0 }, IGNORE, { 0.3333f, 0.3333f, 0.3333f } },
|
|
{ { 0, 0, 0, 0 }, IGNORE, { 0.25f, 0.25f, 0.25f, 0.25f } },
|
|
{ { 0, 0, 0, 0, 0 }, IGNORE, { 0.7071f, 0.7071f, 1.0f, 0.5f, 0.5f } },
|
|
{ { 0, 0, 0, IGNORE, 0, 0 }, IGNORE, { 0.7071f, 0.7071f, 1.0f, IGNORE_F, 0.5f, 0.5f } },
|
|
// Downmixes to stereo
|
|
{ { 0, 1, 0 }, 1, { 1.0f, 1.0f, 0.7071f } },
|
|
{ { 0, 1, 0, 1 }, IGNORE, { 0.5f, 0.5f, 0.5f, 0.5f } },
|
|
{ { 0, 1, 0, 0, 1 }, 1, { 1.0f, 1.0f, 0.7071f, 0.7071f, 0.7071f } },
|
|
{ { 0, 1, 0, IGNORE, 0, 1 }, 1, { 1.0f, 1.0f, 0.7071f, IGNORE_F, 0.7071f, 0.7071f } },
|
|
// Downmixes to 3-channel
|
|
{ { 0, 1, 0, 1 }, IGNORE, { 0.25f, 0.25f, 0.25f, 0.25f } },
|
|
{ { 0, 1, 2, 0, 1 }, IGNORE, { 0.5f, 0.5f, 1.0f, 0.5f, 0.5f } },
|
|
{ { 0, 1, 2, IGNORE, 0, 1 }, IGNORE, { 0.5f, 0.5f, 1.0f, IGNORE_F, 0.5f, 0.5f } },
|
|
// Downmixes to quad
|
|
{ { 0, 1, 0, 2, 3 }, 1, { 1.0f, 1.0f, 0.7071f, 1.0f, 1.0f } },
|
|
{ { 0, 1, 0, IGNORE, 2, 3 }, 1, { 1.0f, 1.0f, 0.7071f, IGNORE_F, 1.0f, 1.0f } },
|
|
// Downmixes to 5-channel
|
|
{ { 0, 1, 2, IGNORE, 3, 4 }, IGNORE, { 1.0f, 1.0f, 1.0f, IGNORE_F, 1.0f, 1.0f } }
|
|
};
|
|
|
|
static const int gDownMixMatrixIndexByOutputChannels[CUSTOM_CHANNEL_LAYOUTS - 1] =
|
|
{ 0, 5, 9, 12, 14 };
|
|
|
|
void
|
|
AudioChannelsDownMix(const nsTArray<const void*>& aChannelArray,
|
|
float** aOutputChannels,
|
|
uint32_t aOutputChannelCount,
|
|
uint32_t aDuration)
|
|
{
|
|
uint32_t inputChannelCount = aChannelArray.Length();
|
|
const void* const* inputChannels = aChannelArray.Elements();
|
|
NS_ASSERTION(inputChannelCount > aOutputChannelCount, "Nothing to do");
|
|
|
|
if (aOutputChannelCount >= 6) {
|
|
// Just drop the unknown channels.
|
|
for (uint32_t o = 0; o < aOutputChannelCount; ++o) {
|
|
memcpy(aOutputChannels[o], inputChannels[o], aDuration*sizeof(float));
|
|
}
|
|
return;
|
|
}
|
|
|
|
// Ignore unknown channels, they're just dropped.
|
|
inputChannelCount = std::min<uint32_t>(6, inputChannelCount);
|
|
|
|
const DownMixMatrix& m = gDownMixMatrices[
|
|
gDownMixMatrixIndexByOutputChannels[aOutputChannelCount - 1] +
|
|
inputChannelCount - aOutputChannelCount - 1];
|
|
|
|
// This is slow, but general. We can define custom code for special
|
|
// cases later.
|
|
for (uint32_t s = 0; s < aDuration; ++s) {
|
|
// Reserve an extra junk channel at the end for the cases where we
|
|
// want an input channel to contribute to nothing
|
|
float outputChannels[CUSTOM_CHANNEL_LAYOUTS];
|
|
memset(outputChannels, 0, sizeof(float)*(CUSTOM_CHANNEL_LAYOUTS - 1));
|
|
for (uint32_t c = 0; c < inputChannelCount; ++c) {
|
|
outputChannels[m.mInputDestination[c]] +=
|
|
m.mInputCoefficient[c]*(static_cast<const float*>(inputChannels[c]))[s];
|
|
}
|
|
// Utilize the fact that in every layout, C is the third channel.
|
|
if (m.mCExtraDestination != IGNORE) {
|
|
outputChannels[m.mCExtraDestination] +=
|
|
m.mInputCoefficient[SURROUND_C]*(static_cast<const float*>(inputChannels[SURROUND_C]))[s];
|
|
}
|
|
|
|
for (uint32_t c = 0; c < aOutputChannelCount; ++c) {
|
|
aOutputChannels[c][s] = outputChannels[c];
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|