Add libvpx wrapper to media to support VP9 video decoding.

media/filters/vpx_video_decoder.cc

Index: media/filters/vpx_video_decoder.cc
diff --git a/media/filters/ffmpeg_video_decoder.cc b/media/filters/vpx_video_decoder.cc
similarity index 34%
copy from media/filters/ffmpeg_video_decoder.cc
copy to media/filters/vpx_video_decoder.cc
index 6f6c49506d54ebe41f26fd474d913bdbd67c202a..662b8cc62bf8d2c0ec67cbfd56fc7825676bee4d 100644
--- a/media/filters/ffmpeg_video_decoder.cc
+++ b/media/filters/vpx_video_decoder.cc
@@ -2,46 +2,45 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "media/filters/ffmpeg_video_decoder.h"
-
-#include <algorithm>
-#include <string>
+#include "media/filters/vpx_video_decoder.h"
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/command_line.h"
 #include "base/location.h"
+#include "base/logging.h"
 #include "base/message_loop_proxy.h"
 #include "base/string_number_conversions.h"
 #include "media/base/bind_to_loop.h"
 #include "media/base/decoder_buffer.h"
 #include "media/base/demuxer_stream.h"
-#include "media/base/limits.h"
 #include "media/base/media_switches.h"
 #include "media/base/pipeline.h"
 #include "media/base/video_decoder_config.h"
 #include "media/base/video_frame.h"
 #include "media/base/video_util.h"
-#include "media/ffmpeg/ffmpeg_common.h"
-#include "media/filters/ffmpeg_glue.h"
+
+// Include libvpx header files.
+// VPX_CODEC_DISABLE_COMPAT excludes parts of the libvpx API that provide
+// backwards compatibility for legacy applications using the library.
+#define VPX_CODEC_DISABLE_COMPAT 1
+extern "C" {
+#include "third_party/libvpx/libvpx.h"
+}
 
 namespace media {
 
 // Always try to use three threads for video decoding.  There is little reason
 // not to since current day CPUs tend to be multi-core and we measured
 // performance benefits on older machines such as P4s with hyperthreading.
-//
-// Handling decoding on separate threads also frees up the pipeline thread to
-// continue processing. Although it'd be nice to have the option of a single
-// decoding thread, FFmpeg treats having one thread the same as having zero
-// threads (i.e., avcodec_decode_video() will execute on the calling thread).
-// Yet another reason for having two threads :)
 static const int kDecodeThreads = 2;
 static const int kMaxDecodeThreads = 16;
 
-// Returns the number of threads given the FFmpeg CodecID. Also inspects the
-// command line for a valid --video-threads flag.
-static int GetThreadCount(CodecID codec_id) {
+// Returns the number of threads.
+static int GetThreadCount() {
+  // TODO(scherkus): De-duplicate this function and the one used by
+  // FFmpegVideoDecoder.
+
   // Refer to http://crbug.com/93932 for tsan suppressions on decoding.
   int decode_threads = kDecodeThreads;
 
@@ -55,91 +54,27 @@ static int GetThreadCount(CodecID codec_id) {
   return decode_threads;
 }
 
-FFmpegVideoDecoder::FFmpegVideoDecoder(
+VpxVideoDecoder::VpxVideoDecoder(
     const scoped_refptr<base::MessageLoopProxy>& message_loop)
     : message_loop_(message_loop),
       state_(kUninitialized),
-      codec_context_(NULL),
-      av_frame_(NULL) {
-}
-
-int FFmpegVideoDecoder::GetVideoBuffer(AVCodecContext* codec_context,
-                                       AVFrame* frame) {
-  // Don't use |codec_context_| here! With threaded decoding,
-  // it will contain unsynchronized width/height/pix_fmt values,
-  // whereas |codec_context| contains the current threads's
-  // updated width/height/pix_fmt, which can change for adaptive
-  // content.
-  VideoFrame::Format format = PixelFormatToVideoFormat(codec_context->pix_fmt);
-  if (format == VideoFrame::INVALID)
-    return AVERROR(EINVAL);
-  DCHECK(format == VideoFrame::YV12 || format == VideoFrame::YV16);
-
-  gfx::Size size(codec_context->width, codec_context->height);
-  int ret;
-  if ((ret = av_image_check_size(size.width(), size.height(), 0, NULL)) < 0)
-    return ret;
-
-  gfx::Size natural_size;
-  if (codec_context->sample_aspect_ratio.num > 0) {
-    natural_size = GetNaturalSize(size,
-                                  codec_context->sample_aspect_ratio.num,
-                                  codec_context->sample_aspect_ratio.den);
-  } else {
-    natural_size = demuxer_stream_->video_decoder_config().natural_size();
-  }
-
-  if (!VideoFrame::IsValidConfig(format, size, gfx::Rect(size), natural_size))
-    return AVERROR(EINVAL);
-
-  scoped_refptr<VideoFrame> video_frame =
-      VideoFrame::CreateFrame(format, size, gfx::Rect(size), natural_size,
-                              kNoTimestamp());
-
-  for (int i = 0; i < 3; i++) {
-    frame->base[i] = video_frame->data(i);
-    frame->data[i] = video_frame->data(i);
-    frame->linesize[i] = video_frame->stride(i);
-  }
-
-  frame->opaque = NULL;
-  video_frame.swap(reinterpret_cast<VideoFrame**>(&frame->opaque));
-  frame->type = FF_BUFFER_TYPE_USER;
-  frame->pkt_pts = codec_context->pkt ? codec_context->pkt->pts :
-                                        AV_NOPTS_VALUE;
-  frame->width = codec_context->width;
-  frame->height = codec_context->height;
-  frame->format = codec_context->pix_fmt;
-
-  return 0;
-}
-
-static int GetVideoBufferImpl(AVCodecContext* s, AVFrame* frame) {
-  FFmpegVideoDecoder* vd = static_cast<FFmpegVideoDecoder*>(s->opaque);
-  return vd->GetVideoBuffer(s, frame);
+      vpx_codec_(NULL) {
 }
 
-static void ReleaseVideoBufferImpl(AVCodecContext* s, AVFrame* frame) {
-  scoped_refptr<VideoFrame> video_frame;
-  video_frame.swap(reinterpret_cast<VideoFrame**>(&frame->opaque));
-
-  // The FFmpeg API expects us to zero the data pointers in
-  // this callback
-  memset(frame->data, 0, sizeof(frame->data));
-  frame->opaque = NULL;
+VpxVideoDecoder::~VpxVideoDecoder() {
+  DCHECK_EQ(kUninitialized, state_);
+  CloseDecoder();
 }
 
-void FFmpegVideoDecoder::Initialize(const scoped_refptr<DemuxerStream>& stream,
-                                    const PipelineStatusCB& status_cb,
-                                    const StatisticsCB& statistics_cb) {
+void VpxVideoDecoder::Initialize(
+    const scoped_refptr<DemuxerStream>& stream,
+    const PipelineStatusCB& status_cb,
+    const StatisticsCB& statistics_cb) {
   DCHECK(message_loop_->BelongsToCurrentThread());
-  PipelineStatusCB initialize_cb = BindToCurrentLoop(status_cb);
-
-  FFmpegGlue::InitializeFFmpeg();
   DCHECK(!demuxer_stream_) << "Already initialized.";
 
   if (!stream) {
-    initialize_cb.Run(PIPELINE_ERROR_DECODE);
+    status_cb.Run(PIPELINE_ERROR_DECODE);
     return;
   }
 
@@ -147,16 +82,57 @@ void FFmpegVideoDecoder::Initialize(const scoped_refptr<DemuxerStream>& stream,
   statistics_cb_ = statistics_cb;
 
   if (!ConfigureDecoder()) {
-    initialize_cb.Run(DECODER_ERROR_NOT_SUPPORTED);
+    status_cb.Run(DECODER_ERROR_NOT_SUPPORTED);
     return;
   }
 
   // Success!
   state_ = kNormal;
-  initialize_cb.Run(PIPELINE_OK);
+  status_cb.Run(PIPELINE_OK);
 }
 
-void FFmpegVideoDecoder::Read(const ReadCB& read_cb) {
+bool VpxVideoDecoder::ConfigureDecoder() {
+  const VideoDecoderConfig& config = demuxer_stream_->video_decoder_config();
+  if (!config.IsValidConfig()) {
+    DLOG(ERROR) << "Invalid video stream config: "
+                << config.AsHumanReadableString();
+    return false;
+  }
+
+  if (config.codec() != kCodecVP9)
+    return false;
+
+  CloseDecoder();
+
+  vpx_codec_ = new vpx_codec_ctx();
+  vpx_codec_dec_cfg_t vpx_config = {0};
+  vpx_config.w = config.coded_size().width();
+  vpx_config.h = config.coded_size().height();
+  vpx_config.threads = GetThreadCount();
+
+  vpx_codec_err_t status = vpx_codec_dec_init(vpx_codec_,
+                                              vpx_codec_vp9_dx(),
+                                              &vpx_config,
+                                              0);
+  if (status != VPX_CODEC_OK) {
+    LOG(ERROR) << "vpx_codec_dec_init failed, status=" << status;
+    delete vpx_codec_;
+    vpx_codec_ = NULL;
+    return false;
+  }
+
+  return true;
+}
+
+void VpxVideoDecoder::CloseDecoder() {
+  if (vpx_codec_) {
+    vpx_codec_destroy(vpx_codec_);
+    delete vpx_codec_;
+    vpx_codec_ = NULL;
+  }
+}
+
+void VpxVideoDecoder::Read(const ReadCB& read_cb) {
   DCHECK(message_loop_->BelongsToCurrentThread());
   DCHECK(!read_cb.is_null());
   CHECK_NE(state_, kUninitialized);
@@ -165,14 +141,14 @@ void FFmpegVideoDecoder::Read(const ReadCB& read_cb) {
 
   // Return empty frames if decoding has finished.
   if (state_ == kDecodeFinished) {
-    base::ResetAndReturn(&read_cb_).Run(kOk, VideoFrame::CreateEmptyFrame());
+    read_cb.Run(kOk, VideoFrame::CreateEmptyFrame());
     return;
   }
 
   ReadFromDemuxerStream();
 }
 
-void FFmpegVideoDecoder::Reset(const base::Closure& closure) {
+void VpxVideoDecoder::Reset(const base::Closure& closure) {
   DCHECK(message_loop_->BelongsToCurrentThread());
   DCHECK(reset_cb_.is_null());
   reset_cb_ = BindToCurrentLoop(closure);
@@ -184,44 +160,31 @@ void FFmpegVideoDecoder::Reset(const base::Closure& closure) {
   DoReset();
 }
 
-void FFmpegVideoDecoder::DoReset() {
-  DCHECK(read_cb_.is_null());
-
-  avcodec_flush_buffers(codec_context_);
-  state_ = kNormal;
-  base::ResetAndReturn(&reset_cb_).Run();
-}
-
-void FFmpegVideoDecoder::Stop(const base::Closure& closure) {
+void VpxVideoDecoder::Stop(const base::Closure& closure) {
   DCHECK(message_loop_->BelongsToCurrentThread());
-  base::ScopedClosureRunner runner(BindToCurrentLoop(closure));
 
-  if (state_ == kUninitialized)
+  if (state_ == kUninitialized) {
+    closure.Run();
     return;
+  }
 
   if (!read_cb_.is_null())
     base::ResetAndReturn(&read_cb_).Run(kOk, NULL);
 
-  ReleaseFFmpegResources();
   state_ = kUninitialized;
+  closure.Run();
 }
 
-FFmpegVideoDecoder::~FFmpegVideoDecoder() {
-  DCHECK_EQ(kUninitialized, state_);
-  DCHECK(!codec_context_);
-  DCHECK(!av_frame_);
-}
-
-void FFmpegVideoDecoder::ReadFromDemuxerStream() {
+void VpxVideoDecoder::ReadFromDemuxerStream() {
   DCHECK_NE(state_, kUninitialized);
   DCHECK_NE(state_, kDecodeFinished);
   DCHECK(!read_cb_.is_null());
 
   demuxer_stream_->Read(base::Bind(
-      &FFmpegVideoDecoder::BufferReady, this));
+      &VpxVideoDecoder::DoDecryptOrDecodeBuffer, this));
 }
 
-void FFmpegVideoDecoder::BufferReady(
+void VpxVideoDecoder::DoDecryptOrDecodeBuffer(
     DemuxerStream::Status status,
     const scoped_refptr<DecoderBuffer>& buffer) {
   DCHECK(message_loop_->BelongsToCurrentThread());
@@ -258,7 +221,7 @@ void FFmpegVideoDecoder::BufferReady(
   DecodeBuffer(buffer);
 }
 
-void FFmpegVideoDecoder::DecodeBuffer(
+void VpxVideoDecoder::DecodeBuffer(
     const scoped_refptr<DecoderBuffer>& buffer) {
   DCHECK(message_loop_->BelongsToCurrentThread());
   DCHECK_NE(state_, kUninitialized);
@@ -267,34 +230,11 @@ void FFmpegVideoDecoder::DecodeBuffer(
   DCHECK(!read_cb_.is_null());
   DCHECK(buffer);
 
-  // During decode, because reads are issued asynchronously, it is possible to
-  // receive multiple end of stream buffers since each read is acked. When the
-  // first end of stream buffer is read, FFmpeg may still have frames queued
-  // up in the decoder so we need to go through the decode loop until it stops
-  // giving sensible data.  After that, the decoder should output empty
-  // frames.  There are three states the decoder can be in:
-  //
-  //   kNormal: This is the starting state. Buffers are decoded. Decode errors
-  //            are discarded.
-  //   kFlushCodec: There isn't any more input data. Call avcodec_decode_video2
-  //                until no more data is returned to flush out remaining
-  //                frames. The input buffer is ignored at this point.
-  //   kDecodeFinished: All calls return empty frames.
-  //
-  // These are the possible state transitions.
-  //
-  // kNormal -> kFlushCodec:
-  //     When buffer->IsEndOfStream() is first true.
-  // kNormal -> kDecodeFinished:
-  //     A decoding error occurs and decoding needs to stop.
-  // kFlushCodec -> kDecodeFinished:
-  //     When avcodec_decode_video2() returns 0 data or errors out.
-  // (any state) -> kNormal:
-  //     Any time Reset() is called.
-
-  // Transition to kFlushCodec on the first end of stream buffer.
+  // Transition to kDecodeFinished on the first end of stream buffer.
   if (state_ == kNormal && buffer->IsEndOfStream()) {
-    state_ = kFlushCodec;
+    state_ = kDecodeFinished;
+    base::ResetAndReturn(&read_cb_).Run(kOk, VideoFrame::CreateEmptyFrame());
+    return;
   }
 
   scoped_refptr<VideoFrame> video_frame;
@@ -311,15 +251,8 @@ void FFmpegVideoDecoder::DecodeBuffer(
     statistics_cb_.Run(statistics);
   }
 
-  // If we didn't get a frame then we've either completely finished decoding or
-  // we need more data.
+  // If we didn't get a frame we need more data.
   if (!video_frame) {
-    if (state_ == kFlushCodec) {
-      state_ = kDecodeFinished;
-      base::ResetAndReturn(&read_cb_).Run(kOk, VideoFrame::CreateEmptyFrame());
-      return;
-    }
-
     ReadFromDemuxerStream();
     return;
   }
@@ -327,125 +260,80 @@ void FFmpegVideoDecoder::DecodeBuffer(
   base::ResetAndReturn(&read_cb_).Run(kOk, video_frame);
 }
 
-bool FFmpegVideoDecoder::Decode(
+bool VpxVideoDecoder::Decode(
     const scoped_refptr<DecoderBuffer>& buffer,
     scoped_refptr<VideoFrame>* video_frame) {
   DCHECK(video_frame);
 
-  // Create a packet for input data.
-  // Due to FFmpeg API changes we no longer have const read-only pointers.
-  AVPacket packet;
-  av_init_packet(&packet);
-  packet.data = const_cast<uint8*>(buffer->GetData());
-  packet.size = buffer->GetDataSize();
-
-  // Let FFmpeg handle presentation timestamp reordering.
-  codec_context_->reordered_opaque = buffer->GetTimestamp().InMicroseconds();
-
-  // Reset frame to default values.
-  avcodec_get_frame_defaults(av_frame_);
-
-  // This is for codecs not using get_buffer to initialize
-  // |av_frame_->reordered_opaque|
-  av_frame_->reordered_opaque = codec_context_->reordered_opaque;
-
-  int frame_decoded = 0;
-  int result = avcodec_decode_video2(codec_context_,
-                                     av_frame_,
-                                     &frame_decoded,
-                                     &packet);
-  // Log the problem if we can't decode a video frame and exit early.
-  if (result < 0) {
-    LOG(ERROR) << "Error decoding a video frame with timestamp: "
-               << buffer->GetTimestamp().InMicroseconds() << " us, duration: "
-               << buffer->GetDuration().InMicroseconds() << " us, packet size: "
-               << buffer->GetDataSize() << " bytes";
-    *video_frame = NULL;
+  // Pass |buffer| to libvpx.
+  int64 timestamp = buffer->GetTimestamp().InMicroseconds();
+  void* user_priv = reinterpret_cast<void*>(&timestamp);
+  vpx_codec_err_t status = vpx_codec_decode(vpx_codec_,
+                                            buffer->GetData(),
+                                            buffer->GetDataSize(),
+                                            user_priv,
+                                            0);
+  if (status != VPX_CODEC_OK) {
+    LOG(ERROR) << "vpx_codec_decode() failed, status=" << status;
     return false;
   }
 
-  // If no frame was produced then signal that more data is required to
-  // produce more frames. This can happen under two circumstances:
-  //   1) Decoder was recently initialized/flushed
-  //   2) End of stream was reached and all internal frames have been output
-  if (frame_decoded == 0) {
+  // Gets pointer to decoded data.
+  vpx_codec_iter_t iter = NULL;
+  const vpx_image_t* vpx_image = vpx_codec_get_frame(vpx_codec_, &iter);
+  if (!vpx_image) {
     *video_frame = NULL;
     return true;
   }
 
-  // TODO(fbarchard): Work around for FFmpeg http://crbug.com/27675
-  // The decoder is in a bad state and not decoding correctly.
-  // Checking for NULL avoids a crash in CopyPlane().
-  if (!av_frame_->data[VideoFrame::kYPlane] ||
-      !av_frame_->data[VideoFrame::kUPlane] ||
-      !av_frame_->data[VideoFrame::kVPlane]) {
-    LOG(ERROR) << "Video frame was produced yet has invalid frame data.";
-    *video_frame = NULL;
+  if (vpx_image->user_priv != reinterpret_cast<void*>(&timestamp)) {
+    LOG(ERROR) << "Invalid output timestamp.";
     return false;
   }
 
-  if (!av_frame_->opaque) {
-    LOG(ERROR) << "VideoFrame object associated with frame data not set.";
-    return false;
-  }
-  *video_frame = static_cast<VideoFrame*>(av_frame_->opaque);
-
-  (*video_frame)->SetTimestamp(
-      base::TimeDelta::FromMicroseconds(av_frame_->reordered_opaque));
-
+  CopyVpxImageTo(vpx_image, video_frame);
+  (*video_frame)->SetTimestamp(base::TimeDelta::FromMicroseconds(timestamp));
   return true;
 }
 
-void FFmpegVideoDecoder::ReleaseFFmpegResources() {
-  if (codec_context_) {
-    av_free(codec_context_->extradata);
-    avcodec_close(codec_context_);
-    av_free(codec_context_);
-    codec_context_ = NULL;
-  }
-  if (av_frame_) {
-    av_free(av_frame_);
-    av_frame_ = NULL;
-  }
-}
-
-bool FFmpegVideoDecoder::ConfigureDecoder() {
-  const VideoDecoderConfig& config = demuxer_stream_->video_decoder_config();
-
-  if (!config.IsValidConfig()) {
-    DLOG(ERROR) << "Invalid video stream - " << config.AsHumanReadableString();
-    return false;
-  }
-
-  if (config.is_encrypted()) {
-    DLOG(ERROR) << "Encrypted video stream not supported.";
-    return false;
-  }
+void VpxVideoDecoder::DoReset() {
+  DCHECK(read_cb_.is_null());
 
-  // Release existing decoder resources if necessary.
-  ReleaseFFmpegResources();
-
-  // Initialize AVCodecContext structure.
-  codec_context_ = avcodec_alloc_context3(NULL);
-  VideoDecoderConfigToAVCodecContext(config, codec_context_);
-
-  // Enable motion vector search (potentially slow), strong deblocking filter
-  // for damaged macroblocks, and set our error detection sensitivity.
-  codec_context_->error_concealment = FF_EC_GUESS_MVS | FF_EC_DEBLOCK;
-  codec_context_->thread_count = GetThreadCount(codec_context_->codec_id);
-  codec_context_->opaque = this;
-  codec_context_->flags |= CODEC_FLAG_EMU_EDGE;
-  codec_context_->get_buffer = GetVideoBufferImpl;
-  codec_context_->release_buffer = ReleaseVideoBufferImpl;
-
-  AVCodec* codec = avcodec_find_decoder(codec_context_->codec_id);
-  if (!codec || avcodec_open2(codec_context_, codec, NULL) < 0) {
-    ReleaseFFmpegResources();
-    return false;
-  }
+  state_ = kNormal;
+  reset_cb_.Run();
+  reset_cb_.Reset();
+}
 
-  av_frame_ = avcodec_alloc_frame();
-  return true;
+void VpxVideoDecoder::CopyVpxImageTo(
+    const vpx_image* vpx_image,
+    scoped_refptr<VideoFrame>* video_frame) {
+  CHECK(vpx_image);
+  CHECK_EQ(vpx_image->d_w % 2, 0U);
+  CHECK_EQ(vpx_image->d_h % 2, 0U);
+  CHECK(vpx_image->fmt == VPX_IMG_FMT_I420 ||
+        vpx_image->fmt == VPX_IMG_FMT_YV12);
+
+  gfx::Size size(vpx_image->d_w, vpx_image->d_h);
+  gfx::Size natural_size =
+      demuxer_stream_->video_decoder_config().natural_size();
+
+  *video_frame = VideoFrame::CreateFrame(VideoFrame::YV12,
+                                         size,
+                                         gfx::Rect(size),
+                                         natural_size,
+                                         kNoTimestamp());
+  CopyYPlane(vpx_image->planes[VPX_PLANE_Y],
+             vpx_image->stride[VPX_PLANE_Y],
+             vpx_image->d_h,
+             *video_frame);
+  CopyUPlane(vpx_image->planes[VPX_PLANE_U],
+             vpx_image->stride[VPX_PLANE_U],
+             vpx_image->d_h / 2,
+             *video_frame);
+  CopyVPlane(vpx_image->planes[VPX_PLANE_V],
+             vpx_image->stride[VPX_PLANE_V],
+             vpx_image->d_h / 2,
+             *video_frame);
 }
 
 }  // namespace media