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--- media/audio/sndio/sndio_output.cc.orig 2023-02-15 13:09:00 UTC
+++ media/audio/sndio/sndio_output.cc
@@ -0,0 +1,187 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/logging.h"
+#include "base/time/time.h"
+#include "base/time/default_tick_clock.h"
+#include "media/audio/audio_manager_base.h"
+#include "media/base/audio_timestamp_helper.h"
+#include "media/audio/sndio/sndio_output.h"
+
+namespace media {
+
+static const SampleFormat kSampleFormat = kSampleFormatS16;
+
+void SndioAudioOutputStream::OnMoveCallback(void *arg, int delta) {
+ SndioAudioOutputStream* self = static_cast<SndioAudioOutputStream*>(arg);
+
+ self->hw_delay -= delta;
+}
+
+void SndioAudioOutputStream::OnVolCallback(void *arg, unsigned int vol) {
+ SndioAudioOutputStream* self = static_cast<SndioAudioOutputStream*>(arg);
+
+ self->vol = vol;
+}
+
+void *SndioAudioOutputStream::ThreadEntry(void *arg) {
+ SndioAudioOutputStream* self = static_cast<SndioAudioOutputStream*>(arg);
+
+ self->ThreadLoop();
+ return NULL;
+}
+
+SndioAudioOutputStream::SndioAudioOutputStream(const AudioParameters& params,
+ AudioManagerBase* manager)
+ : manager(manager),
+ params(params),
+ audio_bus(AudioBus::Create(params)),
+ state(kClosed),
+ mutex(PTHREAD_MUTEX_INITIALIZER) {
+}
+
+SndioAudioOutputStream::~SndioAudioOutputStream() {
+ if (state != kClosed)
+ Close();
+}
+
+bool SndioAudioOutputStream::Open() {
+ if (params.format() != AudioParameters::AUDIO_PCM_LINEAR &&
+ params.format() != AudioParameters::AUDIO_PCM_LOW_LATENCY) {
+ LOG(WARNING) << "Unsupported audio format.";
+ return false;
+ }
+ state = kStopped;
+ volpending = 0;
+ vol = SIO_MAXVOL;
+ buffer = new char[audio_bus->frames() * params.GetBytesPerFrame(kSampleFormat)];
+ return true;
+}
+
+void SndioAudioOutputStream::Close() {
+ if (state == kClosed)
+ goto release;
+ if (state == kRunning)
+ Stop();
+ state = kClosed;
+ delete [] buffer;
+release:
+ manager->ReleaseOutputStream(this); // Calls the destructor
+}
+
+void SndioAudioOutputStream::Start(AudioSourceCallback* callback) {
+ struct sio_par par;
+ int sig;
+
+ sio_initpar(&par);
+ par.rate = params.sample_rate();
+ par.pchan = params.channels();
+ par.bits = SampleFormatToBitsPerChannel(kSampleFormat);
+ par.bps = par.bits / 8;
+ par.sig = sig = par.bits != 8 ? 1 : 0;
+ par.le = SIO_LE_NATIVE;
+ par.appbufsz = params.frames_per_buffer();
+
+ hdl = sio_open(SIO_DEVANY, SIO_PLAY, 0);
+ if (hdl == NULL) {
+ LOG(ERROR) << "Couldn't open audio device.";
+ return;
+ }
+ if (!sio_setpar(hdl, &par) || !sio_getpar(hdl, &par)) {
+ LOG(ERROR) << "Couldn't set audio parameters.";
+ sio_close(hdl);
+ return;
+ }
+ if (par.rate != (unsigned int)params.sample_rate() ||
+ par.pchan != (unsigned int)params.channels() ||
+ par.bits != (unsigned int)SampleFormatToBitsPerChannel(kSampleFormat) ||
+ par.sig != (unsigned int)sig ||
+ (par.bps > 1 && par.le != SIO_LE_NATIVE) ||
+ (par.bits != par.bps * 8)) {
+ LOG(ERROR) << "Unsupported audio parameters.";
+ sio_close(hdl);
+ return;
+ }
+
+ sio_onmove(hdl, &OnMoveCallback, this);
+ sio_onvol(hdl, &OnVolCallback, this);
+
+ state = kRunning;
+ hw_delay = 0;
+ source = callback;
+ sio_start(hdl);
+
+ if (pthread_create(&thread, NULL, &ThreadEntry, this) != 0) {
+ LOG(ERROR) << "Failed to create real-time thread.";
+ sio_stop(hdl);
+ sio_close(hdl);
+ state = kStopped;
+ }
+}
+
+void SndioAudioOutputStream::Stop() {
+ if (state == kStopped)
+ return;
+ state = kStopWait;
+ pthread_join(thread, NULL);
+ sio_stop(hdl);
+ sio_close(hdl);
+ state = kStopped;
+}
+
+void SndioAudioOutputStream::SetVolume(double v) {
+ pthread_mutex_lock(&mutex);
+ vol = v * SIO_MAXVOL;
+ volpending = 1;
+ pthread_mutex_unlock(&mutex);
+}
+
+void SndioAudioOutputStream::GetVolume(double* v) {
+ pthread_mutex_lock(&mutex);
+ *v = vol * (1. / SIO_MAXVOL);
+ pthread_mutex_unlock(&mutex);
+}
+
+// This stream is always used with sub second buffer sizes, where it's
+// sufficient to simply always flush upon Start().
+void SndioAudioOutputStream::Flush() {}
+
+void SndioAudioOutputStream::ThreadLoop(void) {
+ int avail, count, result;
+
+ while (state == kRunning) {
+ // Update volume if needed
+ pthread_mutex_lock(&mutex);
+ if (volpending) {
+ volpending = 0;
+ sio_setvol(hdl, vol);
+ }
+ pthread_mutex_unlock(&mutex);
+
+ // Get data to play
+ const base::TimeDelta delay = AudioTimestampHelper::FramesToTime(hw_delay,
+ params.sample_rate());
+ count = source->OnMoreData(delay, base::TimeTicks::Now(), {}, audio_bus.get());
+ audio_bus->ToInterleaved<SignedInt16SampleTypeTraits>(count, reinterpret_cast<int16_t*>(buffer));
+ if (count == 0) {
+ // We have to submit something to the device
+ count = audio_bus->frames();
+ memset(buffer, 0, count * params.GetBytesPerFrame(kSampleFormat));
+ LOG(WARNING) << "No data to play, running empty cycle.";
+ }
+
+ // Submit data to the device
+ avail = count * params.GetBytesPerFrame(kSampleFormat);
+ result = sio_write(hdl, buffer, avail);
+ if (result == 0) {
+ LOG(WARNING) << "Audio device disconnected.";
+ break;
+ }
+
+ // Update hardware pointer
+ hw_delay += count;
+ }
+}
+
+} // namespace media
|
