Implementation of MediaCodecPlayer stage 1

media/base/android/media_codec_audio_decoder.cc

+// Copyright 2015 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 "media/base/android/media_codec_audio_decoder.h"
+
+#include "base/bind.h"
+#include "base/logging.h"
+#include "media/base/android/media_codec_bridge.h"
+#include "media/base/audio_timestamp_helper.h"
+#include "media/base/demuxer_stream.h"
+
+namespace {
+
+// Use 16bit PCM for audio output. Keep this value in sync with the output
+// format we passed to AudioTrack in MediaCodecBridge.
+const int kBytesPerAudioOutputSample = 2;
+}
+
+namespace media {
+
+MediaCodecAudioDecoder::MediaCodecAudioDecoder(
+    const scoped_refptr<base::SingleThreadTaskRunner>& media_task_runner,
+    const base::Closure& request_data_cb,
+    const base::Closure& starvation_cb,
+    const base::Closure& stop_done_cb,
+    const base::Closure& error_cb,
+    const SetTimeCallback& update_current_time_cb)
+    : MediaCodecDecoder(media_task_runner,
+                        request_data_cb,
+                        starvation_cb,
+                        stop_done_cb,
+                        error_cb,
+                        "AudioDecoder"),
+  volume_(-1.0),
+  bytes_per_frame_(0),
+  output_sampling_rate_(0),
+  frame_count_(0),
+  update_current_time_cb_(update_current_time_cb) {
+}
+
+MediaCodecAudioDecoder::~MediaCodecAudioDecoder() {
+  DVLOG(1) << "AudioDecoder::~AudioDecoder()";
+}
+
+bool MediaCodecAudioDecoder::HasStream() const {
+  // Media thread
+  DCHECK(media_task_runner_->BelongsToCurrentThread());
+
+  return configs_.audio_codec != kUnknownAudioCodec;
+}
+
+void MediaCodecAudioDecoder::SetDemuxerConfigs(const DemuxerConfigs& configs) {
+  // Media thread
+  DCHECK(media_task_runner_->BelongsToCurrentThread());
+
+  DVLOG(1) << class_name() << "::" << __FUNCTION__;
+
+  configs_ = configs;
+  if (!media_codec_bridge_)
+    output_sampling_rate_ = configs.audio_sampling_rate;
+}
+
+void MediaCodecAudioDecoder::Flush() {
+  // Media thread
+  DCHECK(media_task_runner_->BelongsToCurrentThread());
+
+  MediaCodecDecoder::Flush();
+  frame_count_ = 0;
+}
+
+void MediaCodecAudioDecoder::SetVolume(double volume) {
+  // Media thread
+  DCHECK(media_task_runner_->BelongsToCurrentThread());
+
+  DVLOG(1) << class_name() << "::" << __FUNCTION__ << " " << volume;
+
+  volume_ = volume;
+  SetVolumeInternal();
+}
+
+void MediaCodecAudioDecoder::SetBaseTimestamp(base::TimeDelta base_timestamp) {
+  // Media thread
+  DCHECK(media_task_runner_->BelongsToCurrentThread());
+
+  DVLOG(1) << __FUNCTION__ << " " << base_timestamp;
+
+  base_timestamp_ = base_timestamp;
+  if (audio_timestamp_helper_)
+    audio_timestamp_helper_->SetBaseTimestamp(base_timestamp_);
+}
+
+bool MediaCodecAudioDecoder::IsCodecReconfigureNeeded(
+    const DemuxerConfigs& curr,
+    const DemuxerConfigs& next) const {
+  return curr.audio_codec != next.audio_codec ||
+      curr.audio_channels != next.audio_channels ||
+      curr.audio_sampling_rate != next.audio_sampling_rate ||
+      next.is_audio_encrypted != next.is_audio_encrypted ||
+      curr.audio_extra_data.size() != next.audio_extra_data.size() ||
+      !std::equal(curr.audio_extra_data.begin(),
+                  curr.audio_extra_data.end(),
+                  next.audio_extra_data.begin());
+}
+
+MediaCodecDecoder::ConfigStatus
+MediaCodecAudioDecoder::ConfigureInternal() {
+  // Media thread
+  DCHECK(media_task_runner_->BelongsToCurrentThread());
+
+  DVLOG(1) << class_name() << "::" << __FUNCTION__;
+
+  media_codec_bridge_.reset(AudioCodecBridge::Create(configs_.audio_codec));
+  if (!media_codec_bridge_)
+    return CONFIG_FAILURE;
+
+  if (!(static_cast<AudioCodecBridge*>(media_codec_bridge_.get()))->Start(
+      configs_.audio_codec,
+      configs_.audio_sampling_rate,
+      configs_.audio_channels,
+      &configs_.audio_extra_data[0],
+      configs_.audio_extra_data.size(),
+      configs_.audio_codec_delay_ns,
+      configs_.audio_seek_preroll_ns,
+      true,
+      GetMediaCrypto().obj())) {
+
+    DVLOG(1) << class_name() << "::" << __FUNCTION__ << " failed";
+
+    media_codec_bridge_.reset();
+    return CONFIG_FAILURE;
+  }
+
+  DVLOG(1) << class_name() << "::" << __FUNCTION__ << " succeeded";
+
+  SetVolumeInternal();
+
+  bytes_per_frame_ = kBytesPerAudioOutputSample * configs_.audio_channels;
+  frame_count_ = 0;
+  ResetTimestampHelper();
+
+  return CONFIG_OK;
+}
+
+void MediaCodecAudioDecoder::OnOutputFormatChanged() {
+  // Decoder thread
+  DCHECK(decoder_thread_.task_runner()->BelongsToCurrentThread());
+
+  DCHECK(media_codec_bridge_);
+
+  int old_sampling_rate = output_sampling_rate_;
+  output_sampling_rate_ = media_codec_bridge_->GetOutputSamplingRate();
+  if (output_sampling_rate_ != old_sampling_rate)
+    ResetTimestampHelper();
+}
+
+void MediaCodecAudioDecoder::Render(int buffer_index,
+                                    size_t size,
+                                    bool render_output,
+                                    base::TimeDelta pts,
+                                    bool eos_encountered) {
+  // Decoder thread
+  DCHECK(decoder_thread_.task_runner()->BelongsToCurrentThread());
+
+  DVLOG(2) << class_name() << "::" << __FUNCTION__ << " pts:" <<  pts;
+
+  render_output = render_output && (size != 0u);
+
+  if (render_output) {
+    int64 head_position = (static_cast<AudioCodecBridge*>(
+        media_codec_bridge_.get()))->PlayOutputBuffer(
+            buffer_index, size);

[watk, 2015/06/05 01:00:32]

Formatting is a little hard to follow. I ran clang format on this and it turned
it into this:

    if (render_output) {
      int64 head_position =
          (static_cast<AudioCodecBridge*>(media_codec_bridge_.get()))
              ->PlayOutputBuffer(buffer_index, size);

[Tima Vaisburd, 2015/06/05 04:17:46]

Done.

+
+    size_t new_frames_count = size / bytes_per_frame_;
+    frame_count_ += new_frames_count;
+    audio_timestamp_helper_->AddFrames(new_frames_count);
+    int64 frames_to_play = frame_count_ - head_position;
+    DCHECK_GE(frames_to_play, 0);
+
+    base::TimeDelta last_buffered = audio_timestamp_helper_->GetTimestamp();
+    base::TimeDelta now_playing =
+        last_buffered -
+        audio_timestamp_helper_->GetFrameDuration(frames_to_play);
+
+    DVLOG(2) << class_name() << "::" << __FUNCTION__ << " pts:" <<  pts
+             << " will play: [" << now_playing << "," << last_buffered << "]";
+
+    media_task_runner_->PostTask(
+        FROM_HERE,
+        base::Bind(update_current_time_cb_, now_playing, last_buffered));
+  }
+
+  media_codec_bridge_->ReleaseOutputBuffer(buffer_index, false);
+
+  CheckLastFrame(eos_encountered, false); // no delayed tasks
+}
+
+void MediaCodecAudioDecoder::SetVolumeInternal() {
+  // Media thread
+  DCHECK(media_task_runner_->BelongsToCurrentThread());
+
+  if (media_codec_bridge_) {
+    static_cast<AudioCodecBridge*>(media_codec_bridge_.get())->SetVolume(
+        volume_);
+  }
+}
+
+void MediaCodecAudioDecoder::ResetTimestampHelper() {
+  // Media thread or Decoder thread
+  // When this method is called on Media thread, decoder thread
+  // should not be running.
+
+  if (audio_timestamp_helper_)
+    base_timestamp_ = audio_timestamp_helper_->GetTimestamp();
+
+  audio_timestamp_helper_.reset(
+      new AudioTimestampHelper(configs_.audio_sampling_rate));
+
+  audio_timestamp_helper_->SetBaseTimestamp(base_timestamp_);
+}
+
+}  // namespace media