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Improved the audio streaming in AudioManager.

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This commit is contained in:
Leon Styhre 2021-05-09 22:47:46 +02:00
parent 9c4b116681
commit fbbb6aece1
5 changed files with 69 additions and 58 deletions
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2
es-app/src/views/ViewController.cpp
View file

@ -23,6 +23,7 @@
#include "views/gamelist/VideoGameListView.h"
#include "views/SystemView.h"
#include "views/UIModeController.h"
#include "AudioManager.h"
#include "FileFilterIndex.h"
#include "InputManager.h"
#include "Log.h"
@ -319,6 +320,7 @@ void ViewController::restoreViewPosition()
void ViewController::goToSystemView(SystemData* system, bool playTransition)
{
AudioManager::getInstance()->clearStream();
bool applicationStartup = false;
if (mState.viewing == NOTHING)

110
es-core/src/AudioManager.cpp
View file

@ -115,13 +115,9 @@ void AudioManager::init()
if (Settings::getInstance()->getInt("SoundVolumeVideos") < 0)
Settings::getInstance()->setInt("SoundVolumeVideos", 0);
// Used for streaming audio from videos.
sConversionStream = SDL_NewAudioStream(AUDIO_S16, 2, 44100, sAudioFormat.format,
sAudioFormat.channels, sAudioFormat.freq);
if (sConversionStream == nullptr) {
LOG(LogError) << "Failed to create audio conversion stream:";
LOG(LogError) << SDL_GetError();
}
// Use the default sample rate initially, this will possibly be changed by the
// video player when a video is started.
setupAudioStream(sRequestedAudioFormat.freq);
}
void AudioManager::deinit()
@ -136,6 +132,7 @@ void AudioManager::mixAudio(void* /*unused*/, Uint8* stream, int len)
{
// Process navigation sounds.
bool stillPlaying = false;
bool playedSample = false;
// Initialize the buffer to "silence".
SDL_memset(stream, 0, len);
@ -145,6 +142,7 @@ void AudioManager::mixAudio(void* /*unused*/, Uint8* stream, int len)
while (soundIt != sSoundVector.cend()) {
std::shared_ptr<Sound> sound = *soundIt;
if (sound->isPlaying()) {
playedSample = true;
// Calculate rest length of current sample.
Uint32 restLength = (sound->getLength() - sound->getPosition());
if (restLength > static_cast<Uint32>(len)) {
@ -167,58 +165,49 @@ void AudioManager::mixAudio(void* /*unused*/, Uint8* stream, int len)
soundIt++;
}
if (playedSample) {
// We have processed all samples. check if some will continue playing.
if (!stillPlaying) {
// Nothing is playing, pause the audio until Sound::play() wakes us up.
SDL_PauseAudioDevice(sAudioDevice, 1);
}
return;
}
// Process video stream audio.
// The calling function in VideoVlcComponent is currently disabled as the internal
// handling of audio streaming from videos does not work correctly.
// Currently only used by VideoFFmpegComponent as the audio streaming seems to
// be broken for libVLC.
int chunkLength = SDL_AudioStreamAvailable(sConversionStream);
if (chunkLength != 0) {
// Initialize the buffer to "silence".
SDL_memset(stream, 0, len);
if (chunkLength == 0)
return;
Uint8* converted;
converted = new Uint8[chunkLength];
int chunkSegment;
// Cap the chunk length to the buffer size.
if (chunkLength > len)
chunkLength = len;
// Break down the chunk into segments that do not exceed the buffer size.
while (chunkLength > 0) {
if (chunkLength > len) {
chunkSegment = len;
chunkLength -= len;
}
else {
chunkSegment = chunkLength;
chunkLength = 0;
}
std::vector<Uint8> converted(chunkLength);
int processedLength = SDL_AudioStreamGet(sConversionStream, converted, chunkSegment);
if (processedLength == -1) {
LOG(LogError) << "Failed to convert sound chunk:";
LOG(LogError) << SDL_GetError();
delete[] converted;
return;
}
int processedLength = SDL_AudioStreamGet(sConversionStream,
static_cast<void*>(&converted.at(0)), chunkLength);
// Enable only when needed, as it generates a lot of debug output.
// LOG(LogDebug) << "AudioManager::mixAudio(): chunkLength / chunkSegment "
// "/ processedLength: " << chunkLength << " / " << chunkSegment <<
// " / " << processedLength;
if (processedLength > 0)
SDL_MixAudioFormat(stream, converted, sAudioFormat.format, processedLength,
static_cast<int>(Settings::getInstance()->
getInt("SoundVolumeVideos") * 1.28f));
}
delete[] converted;
SDL_PauseAudioDevice(sAudioDevice, 1);
if (processedLength == -1) {
LOG(LogError) << "AudioManager::mixAudio(): Failed to convert sound chunk:";
LOG(LogError) << SDL_GetError();
return;
}
// We have processed all samples. check if some will still be playing.
if (!stillPlaying) {
// Nothing is playing, pause the audio until Sound::play() wakes us up.
// Enable only when needed, as this generates a lot of debug output.
// LOG(LogDebug) << "AudioManager::mixAudio(): chunkLength"
// "/ processedLength: " << chunkLength << " / " <<
// " / " << processedLength;
SDL_MixAudioFormat(stream, &converted.at(0), sAudioFormat.format, processedLength,
static_cast<int>(Settings::getInstance()->
getInt("SoundVolumeVideos") * 1.28f));
if (SDL_AudioStreamAvailable(sConversionStream) == 0)
SDL_PauseAudioDevice(sAudioDevice, 1);
}
}
void AudioManager::registerSound(std::shared_ptr<Sound>& sound)
@ -255,7 +244,20 @@ void AudioManager::stop()
SDL_PauseAudioDevice(sAudioDevice, 1);
}
void AudioManager::processStream(const void *samples, unsigned count)
void AudioManager::setupAudioStream(int sampleRate)
{
SDL_FreeAudioStream(sConversionStream);
// Used for streaming audio from videos.
sConversionStream = SDL_NewAudioStream(AUDIO_F32, 2, sampleRate, sAudioFormat.format,
sAudioFormat.channels, sAudioFormat.freq);
if (sConversionStream == nullptr) {
LOG(LogError) << "Failed to create audio conversion stream:";
LOG(LogError) << SDL_GetError();
}
}
void AudioManager::processStream(const void* samples, unsigned count)
{
if (SDL_AudioStreamPut(sConversionStream, samples, count * sizeof(Uint8)) == -1) {
LOG(LogError) << "Failed to put samples in the conversion stream:";
@ -263,5 +265,11 @@ void AudioManager::processStream(const void *samples, unsigned count)
return;
}
SDL_PauseAudioDevice(sAudioDevice, 0);
if (count > 0)
SDL_PauseAudioDevice(sAudioDevice, 0);
}
void AudioManager::clearStream()
{
SDL_AudioStreamClear(sConversionStream);
}

4
es-core/src/AudioManager.h
View file

@ -31,7 +31,9 @@ public:
void stop();
// Used for streaming audio from videos.
void processStream(const void *samples, unsigned count);
void setupAudioStream(int sampleRate);
void processStream(const void* samples, unsigned count);
void clearStream();
bool getHasAudioDevice() { return sHasAudioDevice; };

9
es-core/src/components/VideoVlcComponent.cpp
View file

@ -3,7 +3,7 @@
// EmulationStation Desktop Edition
// VideoVlcComponent.cpp
//
// Video playing using libVLC.
// Video player based on libVLC.
//
#include "components/VideoVlcComponent.h"
@ -380,12 +380,11 @@ void VideoVlcComponent::startVideo()
// The code below enables the libVLC audio output to be processed inside ES-DE.
// Unfortunately this causes excessive stuttering for some reason that I still
// don't understand, so at the moment this code is disabled. A proper mixer
// such as SDL_mixer would be needed anyway to fully support this.
// don't understand, so at the moment this code is disabled.
// auto audioFormatCallback = [](void **data, char *format,
// unsigned *rate, unsigned *channels) -> int {
// format = const_cast<char*>("S16N");
// *rate = 44100;
// format = const_cast<char*>("F32L");
// *rate = 48000;
// *channels = 2;
// return 0;
// };

2
es-core/src/components/VideoVlcComponent.h
View file

@ -3,7 +3,7 @@
// EmulationStation Desktop Edition
// VideoVlcComponent.h
//
// Video playing using libVLC.
// Video player based on libVLC.
//
#ifndef ES_CORE_COMPONENTS_VIDEO_VLC_COMPONENT_H