Implement software fallback for PPB_VideoDecoder.

content/renderer/pepper/video_decoder_proxy.cc

Index: content/renderer/pepper/video_decoder_proxy.cc
diff --git a/content/renderer/pepper/video_decoder_proxy.cc b/content/renderer/pepper/video_decoder_proxy.cc
new file mode 100644
index 0000000000000000000000000000000000000000..05626fcda3e931e44ada1d17df0d3cdc603a5ab5
--- /dev/null
+++ b/content/renderer/pepper/video_decoder_proxy.cc
@@ -0,0 +1,456 @@
+// Copyright (c) 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 <GLES2/gl2.h>
+#include <GLES2/gl2ext.h>
+#include <GLES2/gl2extchromium.h>
+
+#include "content/renderer/pepper/video_decoder_proxy.h"
+
+#include "base/bind.h"
+#include "content/public/renderer/render_thread.h"
+#include "content/renderer/pepper/pepper_video_decoder_host.h"
+#include "content/renderer/render_thread_impl.h"
+#include "gpu/command_buffer/client/gles2_implementation.h"
+#include "media/base/decoder_buffer.h"
+#include "media/filters/ffmpeg_video_decoder.h"
+#include "media/video/picture.h"
+#include "media/video/video_decode_accelerator.h"
+#include "ppapi/c/pp_errors.h"
+#include "third_party/libyuv/include/libyuv.h"
+#include "webkit/common/gpu/context_provider_web_context.h"
+
+namespace content {
+
+VideoDecoderProxy::PendingDecode::PendingDecode(
+    uint32_t decode_id,
+    const scoped_refptr<media::DecoderBuffer>& buffer)
+    : decode_id(decode_id), buffer(buffer) {
+}
+
+VideoDecoderProxy::PendingDecode::~PendingDecode() {
+}
+
+VideoDecoderProxy::PendingFrame::PendingFrame(uint32_t decode_id,
+                                              const gfx::Size& size)
+    : decode_id(decode_id),
+      size(size),
+      pixels(size.width() * size.height() * 4) {
+}
+
+VideoDecoderProxy::PendingFrame::~PendingFrame() {
+}
+
+VideoDecoderProxy::Delegate::Delegate(VideoDecoderProxy* proxy)
+    : proxy_(proxy), main_message_loop_(base::MessageLoopProxy::current()) {
+  DCHECK(proxy_);
+}
+
+VideoDecoderProxy::Delegate::~Delegate() {
+  DCHECK(pending_decodes_.empty());
+}
+
+void VideoDecoderProxy::Delegate::Initialize(
+    media::VideoDecoderConfig config,
+    scoped_ptr<media::VideoDecoder> decoder) {
+  DCHECK(!decoder_);
+  decoder_.reset(decoder.release());
+  decoder_->Initialize(
+      config,
+      true /* low_delay */,
+      base::Bind(&VideoDecoderProxy::Delegate::OnPipelineStatus,
+                 base::Unretained(this)));
+}
+
+void VideoDecoderProxy::Delegate::OnPipelineStatus(
+    media::PipelineStatus status) {
+  main_message_loop_->PostTask(FROM_HERE,
+                               base::Bind(&VideoDecoderProxy::OnPipelineStatus,
+                                          base::Unretained(proxy_),
+                                          status));
+}
+
+void VideoDecoderProxy::Delegate::ReceiveBuffer(
+    uint32_t decode_id,
+    scoped_refptr<media::DecoderBuffer> buffer) {
+  bool decoder_busy = !pending_decodes_.empty();
+  pending_decodes_.push(PendingDecode(decode_id, buffer));
+  if (!decoder_busy)
+    Decode();
+}
+
+void VideoDecoderProxy::Delegate::Decode() {
+  DCHECK(!pending_decodes_.empty());
+  PendingDecode& next_decode = pending_decodes_.front();
+  decoder_->Decode(next_decode.buffer,
+                   base::Bind(&VideoDecoderProxy::Delegate::ConvertFrame,
+                              base::Unretained(this),
+                              next_decode.decode_id));
+  pending_decodes_.pop();
+}
+
+void VideoDecoderProxy::Delegate::ConvertFrame(
+    uint32_t decode_id,
+    media::VideoDecoder::Status status,
+    const scoped_refptr<media::VideoFrame>& frame) {
+  scoped_ptr<PendingFrame> pending_frame(
+      new PendingFrame(decode_id, gfx::Size()));
+  if (frame) {
+    pending_frame->size = frame->coded_size();
+    pending_frame->pixels.resize(frame->coded_size().width() *
+                                 frame->coded_size().height() * 4);
+    // Convert the decoded frame to ARGB pixels.
+    libyuv::I420ToARGB(frame->data(media::VideoFrame::kYPlane),
+                       frame->stride(media::VideoFrame::kYPlane),
+                       frame->data(media::VideoFrame::kUPlane),
+                       frame->stride(media::VideoFrame::kUPlane),
+                       frame->data(media::VideoFrame::kVPlane),
+                       frame->stride(media::VideoFrame::kVPlane),
+                       &pending_frame->pixels.front(),
+                       frame->coded_size().width() * 4,
+                       frame->coded_size().width(),
+                       frame->coded_size().height());
+  }
+
+  main_message_loop_->PostTask(FROM_HERE,
+                               base::Bind(&VideoDecoderProxy::ReceiveFrame,
+                                          base::Unretained(proxy_),
+                                          status,
+                                          base::Passed(&pending_frame)));
+
+  if (!pending_decodes_.empty())
+    Decode();
+}
+
+void VideoDecoderProxy::Delegate::Reset() {
+  decoder_->Reset(base::Bind(&VideoDecoderProxy::Delegate::OnResetComplete,
+                             base::Unretained(this)));
+}
+
+void VideoDecoderProxy::Delegate::OnResetComplete() {
+  // Cancel all remaining decodes, and notify the host so it can free the shm
+  // buffers. We'll clear pending frames on the main thread.
+  while (!pending_decodes_.empty()) {
+    PendingDecode& next_decode = pending_decodes_.front();
+    scoped_ptr<PendingFrame> pending_frame(
+        new PendingFrame(next_decode.decode_id, gfx::Size()));
+    main_message_loop_->PostTask(FROM_HERE,
+                                 base::Bind(&VideoDecoderProxy::ReceiveFrame,
+                                            base::Unretained(proxy_),
+                                            media::VideoDecoder::kAborted,
+                                            base::Passed(&pending_frame)));
+    pending_decodes_.pop();
+  }
+  main_message_loop_->PostTask(FROM_HERE,
+                               base::Bind(&VideoDecoderProxy::OnResetComplete,
+                                          base::Unretained(proxy_)));
+}
+
+void VideoDecoderProxy::Delegate::Destroy() {
+  DCHECK(decoder_);
+  decoder_->Stop();
+  // All callbacks have been called on the media thread, and thus all tasks
+  // posted for the main thread. This is our last task for the main thread.
+  main_message_loop_->PostTask(FROM_HERE,
+                               base::Bind(&VideoDecoderProxy::OnDestroyComplete,
+                                          base::Unretained(proxy_)));
+}
+
+VideoDecoderProxy::VideoDecoderProxy(PepperVideoDecoderHost* host)
+    : delegate_(this),
+      state_(UNINITIALIZED),
+      host_(host),
+      media_message_loop_(
+          RenderThreadImpl::current()->GetMediaThreadMessageLoopProxy()),
+      context_provider_(
+          RenderThreadImpl::current()->SharedMainThreadContextProvider()),
+      num_pending_decodes_(0) {
+  DCHECK(host_);
+  DCHECK(media_message_loop_);
+  DCHECK(context_provider_);
+}
+
+VideoDecoderProxy::~VideoDecoderProxy() {
+  DCHECK(RenderThreadImpl::current());
+  DCHECK(!host_);
+  // Delete any remaining video frames.
+  while (!pending_frames_.empty()) {
+    delete pending_frames_.front();
+    pending_frames_.pop();
+  }
+  // Delete any remaining textures.
+  TextureIdMap::iterator it = texture_id_map_.begin();
+  for (; it != texture_id_map_.end(); ++it)
+    DeleteTexture(it->second);
+
+  FlushCommandBuffer();
+}
+
+void VideoDecoderProxy::Initialize(media::VideoCodecProfile profile) {
+  DCHECK(RenderThreadImpl::current());
+  DCHECK_EQ(state_, UNINITIALIZED);
+  media::VideoCodec codec = media::kUnknownVideoCodec;
+  if (profile <= media::H264PROFILE_MAX)
+    codec = media::kCodecH264;
+  else if (profile <= media::VP8PROFILE_MAX)
+    codec = media::kCodecVP8;
+  DCHECK_NE(codec, media::kUnknownVideoCodec);
+
+  media::VideoDecoderConfig config(
+      codec,
+      profile,
+      media::VideoFrame::YV12,
+      gfx::Size(32, 24),  // Small sizes that won't fail.
+      gfx::Rect(32, 24),
+      gfx::Size(32, 24),
+      NULL /* extra_data */,
+      0 /* extra_data_size */,
+      false /* decryption */);
+
+  scoped_ptr<media::VideoDecoder> decoder(
+      new media::FFmpegVideoDecoder(media_message_loop_));
+
+  media_message_loop_->PostTask(
+      FROM_HERE,
+      base::Bind(&VideoDecoderProxy::Delegate::Initialize,
+                 base::Unretained(&delegate_),
+                 config,
+                 base::Passed(&decoder)));
+  state_ = DECODING;
+}
+
+void VideoDecoderProxy::Decode(uint32_t decode_id,
+                               const uint8_t* buffer,
+                               uint32_t size) {
+  DCHECK(RenderThreadImpl::current());
+  DCHECK_EQ(state_, DECODING);
+
+  num_pending_decodes_++;
+
+  media_message_loop_->PostTask(
+      FROM_HERE,
+      base::Bind(&VideoDecoderProxy::Delegate::ReceiveBuffer,
+                 base::Unretained(&delegate_),
+                 decode_id,
+                 media::DecoderBuffer::CopyFrom(buffer, size)));
+}
+
+void VideoDecoderProxy::AssignTextures(
+    const std::vector<uint32_t>& texture_ids) {
+  DCHECK(RenderThreadImpl::current());
+  DCHECK_EQ(state_, DECODING);
+  DCHECK(texture_ids.size());
+  DCHECK_EQ(texture_ids.size(), pending_texture_mailboxes_.size());
+  uint32_t num_textures = static_cast<GLuint>(texture_ids.size());
+  std::vector<uint32_t> local_texture_ids(num_textures);
+  gpu::gles2::GLES2Interface* gles2 = context_provider_->ContextGL();
+  gles2->GenTextures(num_textures, &local_texture_ids.front());
+  for (uint32_t i = 0; i < num_textures; i++) {
+    gles2->ActiveTexture(GL_TEXTURE0);
+    gles2->BindTexture(GL_TEXTURE_2D, local_texture_ids[i]);
+    gles2->ConsumeTextureCHROMIUM(GL_TEXTURE_2D,
+                                  pending_texture_mailboxes_[i].name);
+    // Map the plugin texture id to the local texture id.
+    texture_id_map_.insert(
+        std::make_pair(texture_ids[i], local_texture_ids[i]));
+  }
+  pending_texture_mailboxes_.clear();
+  available_textures_.insert(
+      available_textures_.end(), texture_ids.begin(), texture_ids.end());
+  SendPictures();
+}
+
+void VideoDecoderProxy::RecycleTexture(uint32_t texture_id) {
+  DCHECK(RenderThreadImpl::current());
+  if (textures_to_dismiss_.find(texture_id) != textures_to_dismiss_.end()) {
+    DismissTexture(texture_id);
+  } else if (texture_id_map_.find(texture_id) != texture_id_map_.end()) {
+    available_textures_.push_back(texture_id);
+    SendPictures();
+  } else {
+    NOTREACHED();
+  }
+}
+
+void VideoDecoderProxy::Flush() {
+  DCHECK(RenderThreadImpl::current());
+  DCHECK_EQ(state_, DECODING);
+  state_ = FLUSHING;
+}
+
+void VideoDecoderProxy::Reset() {
+  DCHECK(RenderThreadImpl::current());
+  DCHECK_EQ(state_, DECODING);
+  state_ = RESETTING;
+  media_message_loop_->PostTask(FROM_HERE,
+                                base::Bind(&VideoDecoderProxy::Delegate::Reset,
+                                           base::Unretained(&delegate_)));
+}
+
+void VideoDecoderProxy::Destroy() {
+  DCHECK(RenderThreadImpl::current());
+  DCHECK(host_);
+  host_ = NULL;
+  media_message_loop_->PostTask(
+      FROM_HERE,
+      base::Bind(&VideoDecoderProxy::Delegate::Destroy,
+                 base::Unretained(&delegate_)));
+}
+
+void VideoDecoderProxy::OnPipelineStatus(media::PipelineStatus status) {
+  DCHECK(RenderThreadImpl::current());
+  if (!host_)
+    return;
+
+  int32_t result;
+  switch (status) {
+    case media::PIPELINE_OK:
+      result = PP_OK;
+      break;
+    case media::DECODER_ERROR_NOT_SUPPORTED:
+      result = PP_ERROR_NOTSUPPORTED;
+      break;
+    default:
+      result = PP_ERROR_FAILED;
+      break;
+  }
+  host_->OnInitializeComplete(result);
+}
+
+void VideoDecoderProxy::ReceiveFrame(media::VideoDecoder::Status status,
+                                     scoped_ptr<PendingFrame> frame) {
+  DCHECK(RenderThreadImpl::current());
+  if (!host_)
+    return;
+
+  num_pending_decodes_--;
+
+  if (frame->pixels.size()) {
+    if (texture_size_ != frame->size) {
+      // If the size has changed, all current textures must be dismissed. Add
+      // all textures to |textures_to_dismiss_| and dismiss any that aren't in
+      // use by the plugin. We dismiss the rest as they are recycled.
+      for (TextureIdMap::const_iterator it = texture_id_map_.begin();
+           it != texture_id_map_.end();
+           ++it) {
+        textures_to_dismiss_.insert(it->second);
+      }
+      for (std::vector<uint32_t>::const_iterator it =
+               available_textures_.begin();
+           it != available_textures_.end();
+           ++it) {
+        DismissTexture(*it);
+      }
+      available_textures_.clear();
+      FlushCommandBuffer();
+
+      DCHECK(pending_texture_mailboxes_.empty());
+      const uint32_t num_textures = 8;
+      for (uint32_t i = 0; i < num_textures; i++)
+        pending_texture_mailboxes_.push_back(gpu::Mailbox::Generate());
+
+      host_->RequestTextures(
+          num_textures, frame->size, GL_TEXTURE_2D, pending_texture_mailboxes_);
+      texture_size_ = frame->size;
+    }
+
+    pending_frames_.push(frame.release());
+    SendPictures();
+  } else {
+    host_->NotifyEndOfBitstreamBuffer(frame->decode_id);
+  }
+
+  switch (status) {
+    case media::VideoDecoder::kOk:
+    case media::VideoDecoder::kAborted:
+    // This is not necessarily an error.
+    case media::VideoDecoder::kNotEnoughData:
+      break;
+    case media::VideoDecoder::kDecodeError:
+    case media::VideoDecoder::kDecryptError:
+      host_->NotifyError(PP_ERROR_RESOURCE_FAILED);
+      break;
+      // No default case, to catch unhandled status values.
+  }
+}
+
+void VideoDecoderProxy::SendPictures() {
+  DCHECK(RenderThreadImpl::current());
+  if (!host_)
+    return;
+
+  while (!pending_frames_.empty() && !available_textures_.empty()) {
+    scoped_ptr<PendingFrame> frame(pending_frames_.front());
+    pending_frames_.pop();
+
+    uint32_t texture_id = available_textures_.back();
+    available_textures_.pop_back();
+
+    uint32_t local_texture_id = texture_id_map_[texture_id];
+    gpu::gles2::GLES2Interface* gles2 = context_provider_->ContextGL();
+    gles2->ActiveTexture(GL_TEXTURE0);
+    gles2->BindTexture(GL_TEXTURE_2D, local_texture_id);
+    gles2->TexImage2D(GL_TEXTURE_2D,
+                      0,
+                      GL_RGBA,
+                      texture_size_.width(),
+                      texture_size_.height(),
+                      0,
+                      GL_RGBA,
+                      GL_UNSIGNED_BYTE,
+                      &frame->pixels.front());
+
+    host_->NotifyEndOfBitstreamBuffer(frame->decode_id);
+    host_->PictureReady(media::Picture(texture_id, frame->decode_id));
+  }
+
+  FlushCommandBuffer();
+
+  if (state_ == FLUSHING && !num_pending_decodes_ && pending_frames_.empty()) {
+    state_ = DECODING;
+    host_->NotifyFlushDone();
+  }
+}
+
+void VideoDecoderProxy::OnResetComplete() {
+  DCHECK(RenderThreadImpl::current());
+  if (!host_)
+    return;
+
+  while (!pending_frames_.empty()) {
+    scoped_ptr<PendingFrame> frame(pending_frames_.front());
+    host_->NotifyEndOfBitstreamBuffer(frame->decode_id);
+    pending_frames_.pop();
+  }
+
+  state_ = DECODING;
+  host_->NotifyResetDone();
+}
+
+void VideoDecoderProxy::OnDestroyComplete() {
+  DCHECK(RenderThreadImpl::current());
+  DCHECK(!host_);
+  delete this;
+}
+
+void VideoDecoderProxy::DismissTexture(uint32_t texture_id) {
+  DCHECK(host_);
+  textures_to_dismiss_.erase(texture_id);
+  DCHECK(texture_id_map_.find(texture_id) != texture_id_map_.end());
+  DeleteTexture(texture_id_map_[texture_id]);
+  texture_id_map_.erase(texture_id);
+  host_->DismissPictureBuffer(texture_id);
+}
+
+void VideoDecoderProxy::DeleteTexture(uint32_t texture_id) {
+  gpu::gles2::GLES2Interface* gles2 = context_provider_->ContextGL();
+  gles2->DeleteTextures(1, &texture_id);
+}
+
+void VideoDecoderProxy::FlushCommandBuffer() {
+  DCHECK(RenderThreadImpl::current());
+  context_provider_->ContextGL()->Flush();
+}
+
+}  // namespace content