Separate DemuxerStream and VideoDecoder.

media/filters/ffmpeg_video_decoder.cc

 // Copyright (c) 2012 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/filters/ffmpeg_video_decoder.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/command_line.h"
 #include "base/location.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"
 
 namespace media {
@@ skipping 25 matching lines @@
   decode_threads = std::min(decode_threads, kMaxDecodeThreads);
   return decode_threads;
 }
 
 FFmpegVideoDecoder::FFmpegVideoDecoder(
     const scoped_refptr<base::MessageLoopProxy>& message_loop)
     : message_loop_(message_loop),
       weak_factory_(this),
       state_(kUninitialized),
       codec_context_(NULL),
-      av_frame_(NULL),
-      demuxer_stream_(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();
+    natural_size = 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++) {
@@ skipping 22 matching lines @@
 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;
 }
 
-void FFmpegVideoDecoder::Initialize(DemuxerStream* stream,
+void FFmpegVideoDecoder::Initialize(const VideoDecoderConfig& config,
                                     const PipelineStatusCB& status_cb,
                                     const StatisticsCB& statistics_cb) {
   DCHECK(message_loop_->BelongsToCurrentThread());
-  DCHECK(stream);
   DCHECK(read_cb_.is_null());
   DCHECK(reset_cb_.is_null());
+  DCHECK(config.IsValidConfig());
+  DCHECK(!config.is_encrypted());
 
   FFmpegGlue::InitializeFFmpeg();
   weak_this_ = weak_factory_.GetWeakPtr();
 
-  demuxer_stream_ = stream;
+  config_ = config;
   statistics_cb_ = statistics_cb;
   PipelineStatusCB initialize_cb = BindToCurrentLoop(status_cb);
 
   if (!ConfigureDecoder()) {
     initialize_cb.Run(DECODER_ERROR_NOT_SUPPORTED);
     return;
   }
 
   // Success!
   state_ = kNormal;
   initialize_cb.Run(PIPELINE_OK);
 }
 
-void FFmpegVideoDecoder::Read(const ReadCB& read_cb) {
+void FFmpegVideoDecoder::Decode(const scoped_refptr<DecoderBuffer>& buffer,
+                                const ReadCB& read_cb) {
   DCHECK(message_loop_->BelongsToCurrentThread());
   DCHECK(!read_cb.is_null());
   CHECK_NE(state_, kUninitialized);
   CHECK(read_cb_.is_null()) << "Overlapping decodes are not supported.";
   read_cb_ = BindToCurrentLoop(read_cb);
 
   if (state_ == kError) {
     base::ResetAndReturn(&read_cb_).Run(kDecodeError, NULL);
     return;
   }
 
   // Return empty frames if decoding has finished.
   if (state_ == kDecodeFinished) {
     base::ResetAndReturn(&read_cb_).Run(kOk, VideoFrame::CreateEmptyFrame());
     return;
   }
 
-  ReadFromDemuxerStream();
+  DecodeBuffer(buffer);
 }
 
 void FFmpegVideoDecoder::Reset(const base::Closure& closure) {
   DCHECK(message_loop_->BelongsToCurrentThread());
   DCHECK(reset_cb_.is_null());
   reset_cb_ = BindToCurrentLoop(closure);
 
   // Defer the reset if a read is pending.
   if (!read_cb_.is_null())
     return;
@@ skipping 22 matching lines @@
   ReleaseFFmpegResources();
   state_ = kUninitialized;
 }
 
 FFmpegVideoDecoder::~FFmpegVideoDecoder() {
   DCHECK_EQ(kUninitialized, state_);
   DCHECK(!codec_context_);
   DCHECK(!av_frame_);
 }
 
-void FFmpegVideoDecoder::ReadFromDemuxerStream() {
-  DCHECK_NE(state_, kUninitialized);
-  DCHECK_NE(state_, kDecodeFinished);
-  DCHECK_NE(state_, kError);
-  DCHECK(!read_cb_.is_null());
-
-  demuxer_stream_->Read(base::Bind(
-      &FFmpegVideoDecoder::BufferReady, weak_this_));
-}
-
-void FFmpegVideoDecoder::BufferReady(
-    DemuxerStream::Status status,
-    const scoped_refptr<DecoderBuffer>& buffer) {
-  DCHECK(message_loop_->BelongsToCurrentThread());
-  DCHECK_NE(state_, kDecodeFinished);
-  DCHECK_NE(state_, kError);
-  DCHECK_EQ(status != DemuxerStream::kOk, !buffer) << status;
-
-  if (state_ == kUninitialized)
-    return;
-
-  DCHECK(!read_cb_.is_null());
-
-  if (!reset_cb_.is_null()) {
-    base::ResetAndReturn(&read_cb_).Run(kOk, NULL);
-    DoReset();
-    return;
-  }
-
-  if (status == DemuxerStream::kAborted) {
-    base::ResetAndReturn(&read_cb_).Run(kOk, NULL);
-    return;
-  }
-
-  // VideoFrameStream ensures no kConfigChanged is passed to VideoDecoders.
-  DCHECK_EQ(status, DemuxerStream::kOk) << status;
-  DecodeBuffer(buffer);
-}
-
 void FFmpegVideoDecoder::DecodeBuffer(
     const scoped_refptr<DecoderBuffer>& buffer) {
   DCHECK(message_loop_->BelongsToCurrentThread());
   DCHECK_NE(state_, kUninitialized);
   DCHECK_NE(state_, kDecodeFinished);
   DCHECK_NE(state_, kError);
   DCHECK(reset_cb_.is_null());
   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.
@@ skipping 15 matching lines @@
   //     When avcodec_decode_video2() errors out.
   // (any state) -> kNormal:
   //     Any time Reset() is called.
 
   // Transition to kFlushCodec on the first end of stream buffer.
   if (state_ == kNormal && buffer->IsEndOfStream()) {
     state_ = kFlushCodec;
   }
 
   scoped_refptr<VideoFrame> video_frame;
-  if (!Decode(buffer, &video_frame)) {
+  if (!FFmpegDecode(buffer, &video_frame)) {
     state_ = kError;
     base::ResetAndReturn(&read_cb_).Run(kDecodeError, NULL);
     return;
   }
 
   // Any successful decode counts!
   if (!buffer->IsEndOfStream() && buffer->GetDataSize() > 0) {
     PipelineStatistics statistics;
     statistics.video_bytes_decoded = buffer->GetDataSize();
     statistics_cb_.Run(statistics);
   }
 
   if (!video_frame) {
     if (state_ == kFlushCodec) {
       DCHECK(buffer->IsEndOfStream());
       state_ = kDecodeFinished;
       base::ResetAndReturn(&read_cb_).Run(kOk, VideoFrame::CreateEmptyFrame());
       return;
     }
 
-    ReadFromDemuxerStream();
+    base::ResetAndReturn(&read_cb_).Run(kNotEnoughData, NULL);
     return;
   }
 
   base::ResetAndReturn(&read_cb_).Run(kOk, video_frame);
 }
 
-bool FFmpegVideoDecoder::Decode(
+bool FFmpegVideoDecoder::FFmpegDecode(
     const scoped_refptr<DecoderBuffer>& buffer,
     scoped_refptr<VideoFrame>* video_frame) {
   DCHECK(video_frame);
 
   // Reset frame to default values.
   avcodec_get_frame_defaults(av_frame_);
 
   // Create a packet for input data.
   // Due to FFmpeg API changes we no longer have const read-only pointers.
   AVPacket packet;
@@ skipping 64 matching lines @@
     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;
-  }
-
   // Release existing decoder resources if necessary.
   ReleaseFFmpegResources();
 
   // Initialize AVCodecContext structure.
   codec_context_ = avcodec_alloc_context3(NULL);
-  VideoDecoderConfigToAVCodecContext(config, codec_context_);
+  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;
   }
 
   av_frame_ = avcodec_alloc_frame();
   return true;
 }
 
 }  // namespace media