[PPAPI] Pepper MediaStream API audio track implementation and example.

ppapi/proxy/audio_frame_resource.cc

+// Copyright 2014 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 "ppapi/proxy/audio_frame_resource.h"
+
+#include "base/logging.h"
+#include "ppapi/c/pp_bool.h"
+#include "ppapi/shared_impl/var.h"
+
+namespace ppapi {
+namespace proxy {
+
+AudioFrameResource::AudioFrameResource(PP_Instance instance,
+                                       int32_t index,
+                                       MediaStreamFrame* frame)
+    : Resource(OBJECT_IS_PROXY, instance),
+      index_(index),
+      frame_(frame) {
+  DCHECK_EQ(frame_->header.type, MediaStreamFrame::TYPE_AUDIO);
+}
+
+AudioFrameResource::~AudioFrameResource() {
+  CHECK(!frame_) << "An unused (or unrecycled) frame is destroyed.";
+}
+
+thunk::PPB_AudioFrame_API* AudioFrameResource::AsPPB_AudioFrame_API() {
+  return this;
+}
+
+PP_TimeDelta AudioFrameResource::GetTimestamp() {
+  if (!frame_) {
+    VLOG(1) << "Frame is invalid";
+    return 0.0;
+  }
+  return frame_->audio.timestamp;
+}
+
+void AudioFrameResource::SetTimestamp(PP_TimeDelta timestamp) {
+  if (!frame_) {
+    VLOG(1) << "Frame is invalid";
+    return;
+  }
+  frame_->audio.timestamp = timestamp;
+}
+
+PP_AudioFrame_SampleRate AudioFrameResource::GetSampleRate() {
+  if (!frame_) {
+    VLOG(1) << "Frame is invalid";
+    return PP_AUDIOFRAME_SAMPLERATE_UNKNOWN;
+  }
+  return frame_->audio.sample_rate;
+}
+
+PP_AudioFrame_SampleSize AudioFrameResource::GetSampleSize() {
+  if (!frame_) {
+    VLOG(1) << "Frame is invalid";
+    return PP_AUDIOFRAME_SAMPLESIZE_UNKNOWN;
+  }
+  return PP_AUDIOFRAME_SAMPLESIZE_16_BITS;
+}
+
+uint32_t AudioFrameResource::GetNumberOfChannels() {
+  if (!frame_) {
+    VLOG(1) << "Frame is invalid";
+    return 0;
+  }
+  return frame_->audio.number_of_channels;
+}
+
+uint32_t AudioFrameResource::GetNumberOfSamples() {
+  if (!frame_) {
+    VLOG(1) << "Frame is invalid";
+    return 0;
+  }
+  return frame_->audio.number_of_samples;
+}
+
+void* AudioFrameResource::GetDataBuffer() {
+  if (!frame_) {
+    VLOG(1) << "Frame is invalid";
+    return NULL;
+  }
+  return frame_->audio.data;
+}
+
+uint32_t AudioFrameResource::GetDataBufferSize() {
+  if (!frame_) {
+    VLOG(1) << "Frame is invalid";
+    return 0;
+  }
+  return frame_->audio.data_size;
+}
+
+MediaStreamFrame* AudioFrameResource::GetFrameBuffer() {
+  return frame_;
+}
+
+int32_t AudioFrameResource::GetFrameBufferIndex() {
+  return index_;
+}
+
+void AudioFrameResource::Invalidate() {
+  DCHECK(frame_);
+  DCHECK_GE(index_, 0);
+  frame_ = NULL;
+  index_ = -1;
+}
+
+}  // namespace proxy
+}  // namespace ppapi