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// Copyright (C) 2024 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qffmpegaudioencoder_p.h"
#include "qffmpegaudioencoderutils_p.h"
#include "qffmpegaudioinput_p.h"
#include "qffmpegencoderoptions_p.h"
#include "qffmpegmuxer_p.h"
#include "qffmpegrecordingengine_p.h"
#include "qffmpegmediaformatinfo_p.h"
#include <QtCore/qloggingcategory.h>
QT_BEGIN_NAMESPACE
namespace QFFmpeg {
static Q_LOGGING_CATEGORY(qLcFFmpegAudioEncoder, "qt.multimedia.ffmpeg.audioencoder");
AudioEncoder::AudioEncoder(RecordingEngine &recordingEngine, QFFmpegAudioInput *input,
const QMediaEncoderSettings &settings)
: EncoderThread(recordingEngine), m_input(input), m_settings(settings)
{
setObjectName(QLatin1String("AudioEncoder"));
qCDebug(qLcFFmpegAudioEncoder) << "AudioEncoder" << settings.audioCodec();
m_format = input->device.preferredFormat();
auto codecID = QFFmpegMediaFormatInfo::codecIdForAudioCodec(settings.audioCodec());
Q_ASSERT(avformat_query_codec(recordingEngine.avFormatContext()->oformat, codecID,
FF_COMPLIANCE_NORMAL));
const AVAudioFormat requestedAudioFormat(m_format);
m_avCodec = QFFmpeg::findAVEncoder(codecID, {}, requestedAudioFormat.sampleFormat);
if (!m_avCodec)
m_avCodec = QFFmpeg::findAVEncoder(codecID);
qCDebug(qLcFFmpegAudioEncoder) << "found audio codec" << m_avCodec->name;
Q_ASSERT(m_avCodec);
m_stream = avformat_new_stream(recordingEngine.avFormatContext(), nullptr);
m_stream->id = recordingEngine.avFormatContext()->nb_streams - 1;
m_stream->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
m_stream->codecpar->codec_id = codecID;
#if QT_FFMPEG_OLD_CHANNEL_LAYOUT
m_stream->codecpar->channel_layout =
adjustChannelLayout(m_avCodec->channel_layouts, requestedAudioFormat.channelLayoutMask);
m_stream->codecpar->channels = qPopulationCount(m_stream->codecpar->channel_layout);
#else
m_stream->codecpar->ch_layout =
adjustChannelLayout(m_avCodec->ch_layouts, requestedAudioFormat.channelLayout);
#endif
const auto sampleRate =
adjustSampleRate(m_avCodec->supported_samplerates, requestedAudioFormat.sampleRate);
m_stream->codecpar->sample_rate = sampleRate;
m_stream->codecpar->frame_size = 1024;
m_stream->codecpar->format =
adjustSampleFormat(m_avCodec->sample_fmts, requestedAudioFormat.sampleFormat);
m_stream->time_base = AVRational{ 1, sampleRate };
qCDebug(qLcFFmpegAudioEncoder) << "set stream time_base" << m_stream->time_base.num << "/"
<< m_stream->time_base.den;
}
void AudioEncoder::open()
{
m_codecContext.reset(avcodec_alloc_context3(m_avCodec));
if (m_stream->time_base.num != 1 || m_stream->time_base.den != m_format.sampleRate()) {
qCDebug(qLcFFmpegAudioEncoder) << "Most likely, av_format_write_header changed time base from"
<< 1 << "/" << m_format.sampleRate() << "to"
<< m_stream->time_base;
}
m_codecContext->time_base = m_stream->time_base;
avcodec_parameters_to_context(m_codecContext.get(), m_stream->codecpar);
AVDictionaryHolder opts;
applyAudioEncoderOptions(m_settings, m_avCodec->name, m_codecContext.get(), opts);
applyExperimentalCodecOptions(m_avCodec, opts);
int res = avcodec_open2(m_codecContext.get(), m_avCodec, opts);
qCDebug(qLcFFmpegAudioEncoder) << "audio codec opened" << res;
qCDebug(qLcFFmpegAudioEncoder) << "audio codec params: fmt=" << m_codecContext->sample_fmt
<< "rate=" << m_codecContext->sample_rate;
const AVAudioFormat requestedAudioFormat(m_format);
const AVAudioFormat codecAudioFormat(m_codecContext.get());
if (requestedAudioFormat != codecAudioFormat)
m_resampler = createResampleContext(requestedAudioFormat, codecAudioFormat);
}
void AudioEncoder::addBuffer(const QAudioBuffer &buffer)
{
QMutexLocker locker = lockLoopData();
if (!m_paused.loadRelaxed()) {
m_audioBufferQueue.push(buffer);
locker.unlock();
dataReady();
}
}
QAudioBuffer AudioEncoder::takeBuffer()
{
QMutexLocker locker = lockLoopData();
return dequeueIfPossible(m_audioBufferQueue);
}
void AudioEncoder::init()
{
open();
if (m_input) {
m_input->setFrameSize(m_codecContext->frame_size);
}
qCDebug(qLcFFmpegAudioEncoder) << "AudioEncoder::init started audio device thread.";
}
void AudioEncoder::cleanup()
{
while (!m_audioBufferQueue.empty())
processOne();
while (avcodec_send_frame(m_codecContext.get(), nullptr) == AVERROR(EAGAIN))
retrievePackets();
retrievePackets();
}
bool AudioEncoder::hasData() const
{
return !m_audioBufferQueue.empty();
}
void AudioEncoder::retrievePackets()
{
while (1) {
AVPacketUPtr packet(av_packet_alloc());
int ret = avcodec_receive_packet(m_codecContext.get(), packet.get());
if (ret < 0) {
if (ret != AVERROR(EOF))
break;
if (ret != AVERROR(EAGAIN)) {
char errStr[1024];
av_strerror(ret, errStr, 1024);
qCDebug(qLcFFmpegAudioEncoder) << "receive packet" << ret << errStr;
}
break;
}
// qCDebug(qLcFFmpegEncoder) << "writing audio packet" << packet->size << packet->pts <<
// packet->dts;
packet->stream_index = m_stream->id;
m_recordingEngine.getMuxer()->addPacket(std::move(packet));
}
}
void AudioEncoder::processOne()
{
QAudioBuffer buffer = takeBuffer();
if (!buffer.isValid())
return;
if (buffer.format() != m_format) {
// should we recreate recreate resampler here?
qWarning() << "Get invalid audio format:" << buffer.format() << ", expected:" << m_format;
return;
}
// qCDebug(qLcFFmpegEncoder) << "new audio buffer" << buffer.byteCount() << buffer.format()
// << buffer.frameCount() << codec->frame_size;
retrievePackets();
auto frame = makeAVFrame();
frame->format = m_codecContext->sample_fmt;
#if QT_FFMPEG_OLD_CHANNEL_LAYOUT
frame->channel_layout = m_codecContext->channel_layout;
frame->channels = m_codecContext->channels;
#else
frame->ch_layout = m_codecContext->ch_layout;
#endif
frame->sample_rate = m_codecContext->sample_rate;
frame->nb_samples = buffer.frameCount();
if (frame->nb_samples)
av_frame_get_buffer(frame.get(), 0);
if (m_resampler) {
const uint8_t *data = buffer.constData<uint8_t>();
swr_convert(m_resampler.get(), frame->extended_data, frame->nb_samples, &data,
frame->nb_samples);
} else {
memcpy(frame->buf[0]->data, buffer.constData<uint8_t>(), buffer.byteCount());
}
const auto &timeBase = m_stream->time_base;
const auto pts = timeBase.den && timeBase.num
? timeBase.den * m_samplesWritten / (m_codecContext->sample_rate * timeBase.num)
: m_samplesWritten;
setAVFrameTime(*frame, pts, timeBase);
m_samplesWritten += buffer.frameCount();
qint64 time = m_format.durationForFrames(m_samplesWritten);
m_recordingEngine.newTimeStamp(time / 1000);
// qCDebug(qLcFFmpegEncoder) << "sending audio frame" << buffer.byteCount() << frame->pts <<
// ((double)buffer.frameCount()/frame->sample_rate);
int ret = avcodec_send_frame(m_codecContext.get(), frame.get());
if (ret < 0) {
char errStr[1024];
av_strerror(ret, errStr, 1024);
// qCDebug(qLcFFmpegEncoder) << "error sending frame" << ret << errStr;
}
}
} // namespace QFFmpeg
QT_END_NAMESPACE
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