MediaStreamAudioSourceCocoa.cpp [plain text]
#include "config.h"
#include "MediaStreamAudioSource.h"
#if ENABLE(MEDIA_STREAM)
#include "AudioBus.h"
#include "CAAudioStreamDescription.h"
#include "Logging.h"
#include "WebAudioBufferList.h"
#include <CoreAudio/CoreAudioTypes.h>
#include <pal/avfoundation/MediaTimeAVFoundation.h>
#include <pal/cf/CoreMediaSoftLink.h>
#include "CoreVideoSoftLink.h"
using namespace PAL;
namespace WebCore {
static inline AudioStreamBasicDescription streamDescription(size_t sampleRate, size_t channelCount)
{
bool isFloat = true;
bool isBigEndian = false;
bool isNonInterleaved = true;
static const size_t sampleSize = 8 * sizeof(float);
AudioStreamBasicDescription streamFormat;
FillOutASBDForLPCM(streamFormat, sampleRate, channelCount, sampleSize, sampleSize, isFloat, isBigEndian, isNonInterleaved);
return streamFormat;
}
static inline void copyChannelData(AudioChannel& channel, AudioBuffer& buffer, size_t numberOfFrames, bool isMuted)
{
buffer.mDataByteSize = numberOfFrames * sizeof(float);
buffer.mNumberChannels = 1;
if (isMuted) {
memset(buffer.mData, 0, buffer.mDataByteSize);
return;
}
memcpy(buffer.mData, channel.data(), buffer.mDataByteSize);
}
void MediaStreamAudioSource::consumeAudio(AudioBus& bus, size_t numberOfFrames)
{
if (bus.numberOfChannels() != 1 && bus.numberOfChannels() != 2) {
RELEASE_LOG_ERROR(Media, "MediaStreamAudioSource::consumeAudio(%p) trying to consume bus with %u channels", this, bus.numberOfChannels());
return;
}
CMTime startTime = CMTimeMake(m_numberOfFrames, m_currentSettings.sampleRate());
auto mediaTime = PAL::toMediaTime(startTime);
m_numberOfFrames += numberOfFrames;
AudioStreamBasicDescription newDescription = streamDescription(m_currentSettings.sampleRate(), bus.numberOfChannels());
WebAudioBufferList audioBufferList { CAAudioStreamDescription(newDescription), WTF::safeCast<uint32_t>(numberOfFrames) };
for (size_t cptr = 0; cptr < bus.numberOfChannels(); ++cptr)
copyChannelData(*bus.channel(cptr), *audioBufferList.buffer(cptr), numberOfFrames, muted());
audioSamplesAvailable(mediaTime, audioBufferList, CAAudioStreamDescription(newDescription), numberOfFrames);
}
}
#endif // ENABLE(MEDIA_STREAM)