Add DecryptingAudioDecoder.

media/filters/decrypting_audio_decoder.cc

Index: media/filters/decrypting_audio_decoder.cc
diff --git a/media/filters/decrypting_video_decoder.cc b/media/filters/decrypting_audio_decoder.cc
similarity index 66%
copy from media/filters/decrypting_video_decoder.cc
copy to media/filters/decrypting_audio_decoder.cc
index 8ea96750b301cdd70b6c561d3fbff453393895b8..a6871b5335930fa5a2638ad96d4230d91de5edc6 100644
--- a/media/filters/decrypting_video_decoder.cc
+++ b/media/filters/decrypting_audio_decoder.cc
@@ -2,57 +2,61 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "media/filters/decrypting_video_decoder.h"
+#include "media/filters/decrypting_audio_decoder.h"
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/location.h"
 #include "base/message_loop_proxy.h"
+#include "media/base/audio_decoder_config.h"
 #include "media/base/bind_to_loop.h"
+#include "media/base/buffers.h"
+#include "media/base/data_buffer.h"
 #include "media/base/decoder_buffer.h"
 #include "media/base/decryptor.h"
 #include "media/base/demuxer_stream.h"
 #include "media/base/pipeline.h"
-#include "media/base/video_decoder_config.h"
-#include "media/base/video_frame.h"
 
 namespace media {
 
 #define BIND_TO_LOOP(function) \
     media::BindToLoop(message_loop_, base::Bind(function, this))
 
-DecryptingVideoDecoder::DecryptingVideoDecoder(
+DecryptingAudioDecoder::DecryptingAudioDecoder(
     const MessageLoopFactoryCB& message_loop_factory_cb,
     const RequestDecryptorNotificationCB& request_decryptor_notification_cb)
     : message_loop_factory_cb_(message_loop_factory_cb),
       state_(kUninitialized),
       request_decryptor_notification_cb_(request_decryptor_notification_cb),
       decryptor_(NULL),
-      key_added_while_pending_decode_(false) {
+      key_added_while_pending_decode_(false),
+      bits_per_channel_(0),
+      channel_layout_(CHANNEL_LAYOUT_NONE),
+      samples_per_second_(0) {
 }
 
-void DecryptingVideoDecoder::Initialize(
+void DecryptingAudioDecoder::Initialize(
     const scoped_refptr<DemuxerStream>& stream,
     const PipelineStatusCB& status_cb,
     const StatisticsCB& statistics_cb) {
   DCHECK(!message_loop_);
   message_loop_ = base::ResetAndReturn(&message_loop_factory_cb_).Run();
   message_loop_->PostTask(FROM_HERE, base::Bind(
-      &DecryptingVideoDecoder::DoInitialize, this,
+      &DecryptingAudioDecoder::DoInitialize, this,
       stream, status_cb, statistics_cb));
 }
 
-void DecryptingVideoDecoder::Read(const ReadCB& read_cb) {
+void DecryptingAudioDecoder::Read(const ReadCB& read_cb) {
   // Complete operation asynchronously on different stack of execution as per
-  // the API contract of VideoDecoder::Read()
+  // the API contract of AudioDecoder::Read()
   message_loop_->PostTask(FROM_HERE, base::Bind(
-      &DecryptingVideoDecoder::DoRead, this, read_cb));
+      &DecryptingAudioDecoder::DoRead, this, read_cb));
 }
 
-void DecryptingVideoDecoder::Reset(const base::Closure& closure) {
+void DecryptingAudioDecoder::Reset(const base::Closure& closure) {
   if (!message_loop_->BelongsToCurrentThread()) {
     message_loop_->PostTask(FROM_HERE, base::Bind(
-        &DecryptingVideoDecoder::Reset, this, closure));
+        &DecryptingAudioDecoder::Reset, this, closure));
     return;
   }
 
@@ -67,7 +71,7 @@ void DecryptingVideoDecoder::Reset(const base::Closure& closure) {
 
   reset_cb_ = closure;
 
-  decryptor_->ResetDecoder(Decryptor::kVideo);
+  decryptor_->ResetDecoder(Decryptor::kAudio);
 
   // Reset() cannot complete if the read callback is still pending.
   // Defer the resetting process in this case. The |reset_cb_| will be fired
@@ -88,41 +92,22 @@ void DecryptingVideoDecoder::Reset(const base::Closure& closure) {
   DoReset();
 }
 
-void DecryptingVideoDecoder::Stop(const base::Closure& closure) {
-  if (!message_loop_->BelongsToCurrentThread()) {
-    message_loop_->PostTask(FROM_HERE, base::Bind(
-        &DecryptingVideoDecoder::Stop, this, closure));
-    return;
-  }
+int DecryptingAudioDecoder::bits_per_channel() {
+  return bits_per_channel_;
+}
 
-  DVLOG(2) << "Stop() - state: " << state_;
-
-  // At this point the render thread is likely paused (in WebMediaPlayerImpl's
-  // Destroy()), so running |closure| can't wait for anything that requires the
-  // render thread to be processing messages to complete (such as PPAPI
-  // callbacks).
-  if (decryptor_)
-    decryptor_->DeinitializeDecoder(Decryptor::kVideo);
-  if (!request_decryptor_notification_cb_.is_null()) {
-    base::ResetAndReturn(&request_decryptor_notification_cb_).Run(
-        DecryptorNotificationCB());
-  }
-  pending_buffer_to_decode_ = NULL;
-  if (!init_cb_.is_null())
-    base::ResetAndReturn(&init_cb_).Run(DECODER_ERROR_NOT_SUPPORTED);
-  if (!read_cb_.is_null())
-    base::ResetAndReturn(&read_cb_).Run(kOk, NULL);
-  if (!reset_cb_.is_null())
-    base::ResetAndReturn(&reset_cb_).Run();
-  state_ = kStopped;
-  closure.Run();
+ChannelLayout DecryptingAudioDecoder::channel_layout() {
+  return channel_layout_;
 }
 
-DecryptingVideoDecoder::~DecryptingVideoDecoder() {
-  DCHECK(state_ == kUninitialized || state_ == kStopped) << state_;
+int DecryptingAudioDecoder::samples_per_second() {
+  return samples_per_second_;
 }
 
-void DecryptingVideoDecoder::DoInitialize(
+DecryptingAudioDecoder::~DecryptingAudioDecoder() {
+}
+
+void DecryptingAudioDecoder::DoInitialize(
     const scoped_refptr<DemuxerStream>& stream,
     const PipelineStatusCB& status_cb,
     const StatisticsCB& statistics_cb) {
@@ -131,15 +116,14 @@ void DecryptingVideoDecoder::DoInitialize(
   DCHECK_EQ(state_, kUninitialized) << state_;
   DCHECK(stream);
 
-  const VideoDecoderConfig& config = stream->video_decoder_config();
+  const AudioDecoderConfig& config = stream->audio_decoder_config();
   if (!config.IsValidConfig()) {
-    DLOG(ERROR) << "Invalid video stream config: "
-                << config.AsHumanReadableString();
+    DLOG(ERROR) << "Invalid audio stream config.";
     status_cb.Run(PIPELINE_ERROR_DECODE);
     return;
   }
 
-  // DecryptingVideoDecoder only accepts potentially encrypted stream.
+  // DecryptingAudioDecoder only accepts potentially encrypted stream.
   if (!config.is_encrypted()) {
     status_cb.Run(DECODER_ERROR_NOT_SUPPORTED);
     return;
@@ -153,40 +137,32 @@ void DecryptingVideoDecoder::DoInitialize(
 
   state_ = kDecryptorRequested;
   request_decryptor_notification_cb_.Run(
-      BIND_TO_LOOP(&DecryptingVideoDecoder::SetDecryptor));
+      BIND_TO_LOOP(&DecryptingAudioDecoder::SetDecryptor));
 }
 
-void DecryptingVideoDecoder::SetDecryptor(Decryptor* decryptor) {
+void DecryptingAudioDecoder::SetDecryptor(Decryptor* decryptor) {
   DVLOG(2) << "SetDecryptor()";
   DCHECK(message_loop_->BelongsToCurrentThread());
-
-  if (state_ == kStopped)
-    return;
-
   DCHECK_EQ(state_, kDecryptorRequested) << state_;
   DCHECK(!init_cb_.is_null());
   DCHECK(!request_decryptor_notification_cb_.is_null());
-  request_decryptor_notification_cb_.Reset();
 
+  request_decryptor_notification_cb_.Reset();
   decryptor_ = decryptor;
 
-  scoped_ptr<VideoDecoderConfig> scoped_config(new VideoDecoderConfig());
-  scoped_config->CopyFrom(demuxer_stream_->video_decoder_config());
+  scoped_ptr<AudioDecoderConfig> scoped_config(new AudioDecoderConfig());
+  scoped_config->CopyFrom(demuxer_stream_->audio_decoder_config());
 
   state_ = kPendingDecoderInit;
-  decryptor_->InitializeVideoDecoder(
+  decryptor_->InitializeAudioDecoder(
       scoped_config.Pass(),
-      BIND_TO_LOOP(&DecryptingVideoDecoder::FinishInitialization),
-      BIND_TO_LOOP(&DecryptingVideoDecoder::OnKeyAdded));
+      BIND_TO_LOOP(&DecryptingAudioDecoder::FinishInitialization),
+      BIND_TO_LOOP(&DecryptingAudioDecoder::OnKeyAdded));
 }
 
-void DecryptingVideoDecoder::FinishInitialization(bool success) {
+void DecryptingAudioDecoder::FinishInitialization(bool success) {
   DVLOG(2) << "FinishInitialization()";
   DCHECK(message_loop_->BelongsToCurrentThread());
-
-  if (state_ == kStopped)
-    return;
-
   DCHECK_EQ(state_, kPendingDecoderInit) << state_;
   DCHECK(!init_cb_.is_null());
   DCHECK(reset_cb_.is_null());  // No Reset() before initialization finished.
@@ -194,25 +170,37 @@ void DecryptingVideoDecoder::FinishInitialization(bool success) {
 
   if (!success) {
     base::ResetAndReturn(&init_cb_).Run(DECODER_ERROR_NOT_SUPPORTED);
-    state_ = kStopped;
+    state_ = kDecodeFinished;
     return;
   }
 
   // Success!
+  const AudioDecoderConfig& config = demuxer_stream_->audio_decoder_config();
+  bits_per_channel_ = config.bits_per_channel();
+  channel_layout_ = config.channel_layout();
+  samples_per_second_ = config.samples_per_second();
   state_ = kIdle;
   base::ResetAndReturn(&init_cb_).Run(PIPELINE_OK);
 }
 
-void DecryptingVideoDecoder::DoRead(const ReadCB& read_cb) {
+void DecryptingAudioDecoder::DoRead(const ReadCB& read_cb) {
   DVLOG(3) << "DoRead()";
   DCHECK(message_loop_->BelongsToCurrentThread());
   DCHECK(state_ == kIdle || state_ == kDecodeFinished) << state_;
   DCHECK(!read_cb.is_null());
   CHECK(read_cb_.is_null()) << "Overlapping decodes are not supported.";
 
-  // Return empty frames if decoding has finished.
+  // Return empty (end-of-stream) frames if decoding has finished.
   if (state_ == kDecodeFinished) {
-    read_cb.Run(kOk, VideoFrame::CreateEmptyFrame());
+    read_cb.Run(kOk, scoped_refptr<Buffer>(new DataBuffer(0)));
+    return;
+  }
+
+  if (!queued_audio_frames_.empty()) {
+    if (queued_audio_frames_.front()->IsEndOfStream())
+      state_ = kDecodeFinished;
+    read_cb.Run(kOk, queued_audio_frames_.front());
+    queued_audio_frames_.pop_front();
     return;
   }
 
@@ -221,16 +209,16 @@ void DecryptingVideoDecoder::DoRead(const ReadCB& read_cb) {
   ReadFromDemuxerStream();
 }
 
-void DecryptingVideoDecoder::ReadFromDemuxerStream() {
+void DecryptingAudioDecoder::ReadFromDemuxerStream() {
   DCHECK(message_loop_->BelongsToCurrentThread());
   DCHECK_EQ(state_, kPendingDemuxerRead) << state_;
   DCHECK(!read_cb_.is_null());
 
   demuxer_stream_->Read(
-      base::Bind(&DecryptingVideoDecoder::DecryptAndDecodeBuffer, this));
+      base::Bind(&DecryptingAudioDecoder::DecryptAndDecodeBuffer, this));
 }
 
-void DecryptingVideoDecoder::DecryptAndDecodeBuffer(
+void DecryptingAudioDecoder::DecryptAndDecodeBuffer(
     DemuxerStream::Status status,
     const scoped_refptr<DecoderBuffer>& buffer) {
   // In theory, we don't need to force post the task here, because we do a
@@ -239,26 +227,21 @@ void DecryptingVideoDecoder::DecryptAndDecodeBuffer(
   // stack we are still fine. But it looks like a force post task makes the
   // logic more understandable and manageable, so why not?
   message_loop_->PostTask(FROM_HERE, base::Bind(
-      &DecryptingVideoDecoder::DoDecryptAndDecodeBuffer, this, status, buffer));
+      &DecryptingAudioDecoder::DoDecryptAndDecodeBuffer, this, status, buffer));
 }
 
-void DecryptingVideoDecoder::DoDecryptAndDecodeBuffer(
+void DecryptingAudioDecoder::DoDecryptAndDecodeBuffer(
     DemuxerStream::Status status,
     const scoped_refptr<DecoderBuffer>& buffer) {
   DVLOG(3) << "DoDecryptAndDecodeBuffer()";
   DCHECK(message_loop_->BelongsToCurrentThread());
-
-  if (state_ == kStopped)
-    return;
-
   DCHECK_EQ(state_, kPendingDemuxerRead) << state_;
   DCHECK(!read_cb_.is_null());
   DCHECK_EQ(buffer != NULL, status == DemuxerStream::kOk) << status;
 
   if (!reset_cb_.is_null()) {
     base::ResetAndReturn(&read_cb_).Run(kOk, NULL);
-    if (!reset_cb_.is_null())
-      DoReset();
+    DoReset();
     return;
   }
 
@@ -285,41 +268,38 @@ void DecryptingVideoDecoder::DoDecryptAndDecodeBuffer(
   DecodePendingBuffer();
 }
 
-void DecryptingVideoDecoder::DecodePendingBuffer() {
+void DecryptingAudioDecoder::DecodePendingBuffer() {
   DCHECK(message_loop_->BelongsToCurrentThread());
   DCHECK_EQ(state_, kPendingDecode) << state_;
-  decryptor_->DecryptAndDecodeVideo(
+  decryptor_->DecryptAndDecodeAudio(
       pending_buffer_to_decode_,
-      base::Bind(&DecryptingVideoDecoder::DeliverFrame, this,
+      base::Bind(&DecryptingAudioDecoder::DeliverFrame, this,
                  pending_buffer_to_decode_->GetDataSize()));
 }
 
-void DecryptingVideoDecoder::DeliverFrame(
+void DecryptingAudioDecoder::DeliverFrame(
     int buffer_size,
     Decryptor::Status status,
-    const scoped_refptr<VideoFrame>& frame) {
-  // We need to force task post here because the VideoDecodeCB can be executed
-  // synchronously in Reset()/Stop(). Instead of using more complicated logic in
+    const Decryptor::AudioBuffers& frames) {
+  // We need to force task post here because the AudioDecodeCB can be executed
+  // synchronously in Reset(). Instead of using more complicated logic in
   // those function to fix it, why not force task post here to make everything
   // simple and clear?
   message_loop_->PostTask(FROM_HERE, base::Bind(
-      &DecryptingVideoDecoder::DoDeliverFrame, this,
-      buffer_size, status, frame));
+      &DecryptingAudioDecoder::DoDeliverFrame, this,
+      buffer_size, status, frames));
 }
 
-void DecryptingVideoDecoder::DoDeliverFrame(
+void DecryptingAudioDecoder::DoDeliverFrame(
     int buffer_size,
     Decryptor::Status status,
-    const scoped_refptr<VideoFrame>& frame) {
+    const Decryptor::AudioBuffers& frames) {
   DVLOG(3) << "DoDeliverFrame()";
   DCHECK(message_loop_->BelongsToCurrentThread());
-
-  if (state_ == kStopped)
-    return;
-
   DCHECK_EQ(state_, kPendingDecode) << state_;
   DCHECK(!read_cb_.is_null());
   DCHECK(pending_buffer_to_decode_);
+  DCHECK(queued_audio_frames_.empty());
 
   bool need_to_try_again_if_nokey_is_returned = key_added_while_pending_decode_;
   key_added_while_pending_decode_ = false;
@@ -327,20 +307,19 @@ void DecryptingVideoDecoder::DoDeliverFrame(
   if (!reset_cb_.is_null()) {
     pending_buffer_to_decode_ = NULL;
     base::ResetAndReturn(&read_cb_).Run(kOk, NULL);
-    if (!reset_cb_.is_null())
-      DoReset();
+    DoReset();
     return;
   }
 
   if (status == Decryptor::kError) {
-    DCHECK(!frame);
+    DCHECK(frames.empty());
     state_ = kDecodeFinished;
     base::ResetAndReturn(&read_cb_).Run(kDecodeError, NULL);
     return;
   }
 
   if (status == Decryptor::kNoKey) {
-    DCHECK(!frame);
+    DCHECK(frames.empty());
     if (need_to_try_again_if_nokey_is_returned) {
       // The |state_| is still kPendingDecode.
       DecodePendingBuffer();
@@ -354,24 +333,29 @@ void DecryptingVideoDecoder::DoDeliverFrame(
   // The buffer has been accepted by the decoder, let's report statistics.
   if (buffer_size) {
     PipelineStatistics statistics;
-    statistics.video_bytes_decoded = buffer_size;
+    statistics.audio_bytes_decoded = buffer_size;
     statistics_cb_.Run(statistics);
   }
 
   if (status == Decryptor::kNeedMoreData) {
-    DCHECK(!frame);
+    DCHECK(frames.empty());
     state_ = kPendingDemuxerRead;
     ReadFromDemuxerStream();
     return;
   }
 
   DCHECK_EQ(status, Decryptor::kSuccess);
-  state_ = frame->IsEndOfStream() ? kDecodeFinished : kIdle;
-  base::ResetAndReturn(&read_cb_).Run(kOk, frame);
+
+  DCHECK(!frames.empty());
+  queued_audio_frames_ = frames;
+
+  scoped_refptr<Buffer> first_frame = queued_audio_frames_.front();
+  queued_audio_frames_.pop_front();
+  state_ = first_frame->IsEndOfStream() ? kDecodeFinished : kIdle;
+  base::ResetAndReturn(&read_cb_).Run(kOk, first_frame);
 }
 
-void DecryptingVideoDecoder::OnKeyAdded() {
-  DVLOG(2) << "OnKeyAdded()";
+void DecryptingAudioDecoder::OnKeyAdded() {
   DCHECK(message_loop_->BelongsToCurrentThread());
 
   if (state_ == kPendingDecode) {
@@ -385,7 +369,7 @@ void DecryptingVideoDecoder::OnKeyAdded() {
   }
 }
 
-void DecryptingVideoDecoder::DoReset() {
+void DecryptingAudioDecoder::DoReset() {
   DCHECK(init_cb_.is_null());
   DCHECK(read_cb_.is_null());
   state_ = kIdle;