Remove DemuxerFactory and URL parameter from Pipeline.

media/filters/ffmpeg_demuxer.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 "base/bind.h"
 #include "base/callback.h"
 #include "base/command_line.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
 #include "base/stl_util.h"
@@ skipping 258 matching lines @@
     const AVRational& time_base, int64 timestamp) {
   if (timestamp == static_cast<int64>(AV_NOPTS_VALUE))
     return kNoTimestamp();
 
   return ConvertFromTimeBase(time_base, timestamp);
 }
 
 //
 // FFmpegDemuxer
 //
-FFmpegDemuxer::FFmpegDemuxer(MessageLoop* message_loop, bool local_source)
+FFmpegDemuxer::FFmpegDemuxer(
+    MessageLoop* message_loop,
+    const scoped_refptr<DataSource>& data_source,
+    bool local_source)
     : message_loop_(message_loop),
       local_source_(local_source),
       format_context_(NULL),
+      data_source_(data_source),
       read_event_(false, false),
       read_has_failed_(false),
       last_read_bytes_(0),
       read_position_(0),
-      max_duration_(base::TimeDelta::FromMicroseconds(-1)),
-      deferred_status_(PIPELINE_OK),
+      bitrate_(0),
       first_seek_hack_(true),
       start_time_(kNoTimestamp()),
       audio_disabled_(false) {
   DCHECK(message_loop_);
+  DCHECK(data_source_);
 }
 
 FFmpegDemuxer::~FFmpegDemuxer() {
   // In this destructor, we clean up resources held by FFmpeg. It is ugly to
   // close the codec contexts here because the corresponding codecs are opened
   // in the decoder filters. By reaching this point, all filters should have
   // stopped, so this is the only safe place to do the global clean up.
   // TODO(hclam): close the codecs in the corresponding decoders.
   if (!format_context_)
     return;
@@ skipping 26 matching lines @@
   data_source_->SetPlaybackRate(playback_rate);
 }
 
 void FFmpegDemuxer::OnAudioRendererDisabled() {
   message_loop_->PostTask(FROM_HERE, base::Bind(
       &FFmpegDemuxer::DisableAudioStreamTask, this));
 }
 
 void FFmpegDemuxer::set_host(DemuxerHost* demuxer_host) {
   Demuxer::set_host(demuxer_host);
-  if (data_source_)
-    data_source_->set_host(demuxer_host);
-  if (max_duration_.InMicroseconds() >= 0)
-    host()->SetDuration(max_duration_);
-  if (read_position_ > 0)
-    host()->SetCurrentReadPosition(read_position_);
-  if (deferred_status_ != PIPELINE_OK)
-    host()->OnDemuxerError(deferred_status_);
+  data_source_->set_host(demuxer_host);
 }
 
-void FFmpegDemuxer::Initialize(DataSource* data_source,
-                               const PipelineStatusCB& status_cb) {
-  message_loop_->PostTask(
-      FROM_HERE,
-      base::Bind(&FFmpegDemuxer::InitializeTask, this,
-                 make_scoped_refptr(data_source), status_cb));
+void FFmpegDemuxer::Initialize(const PipelineStatusCB& status_cb) {
+  message_loop_->PostTask(FROM_HERE, base::Bind(
+      &FFmpegDemuxer::InitializeTask, this, status_cb));
 }
 
 scoped_refptr<DemuxerStream> FFmpegDemuxer::GetStream(
     DemuxerStream::Type type) {
   StreamVector::iterator iter;
   for (iter = streams_.begin(); iter != streams_.end(); ++iter) {
     if (*iter && (*iter)->type() == type) {
       return *iter;
     }
   }
@@ skipping 20 matching lines @@
 
   // Asynchronous read from data source.
   data_source_->Read(read_position_, size, data, base::Bind(
       &FFmpegDemuxer::SignalReadCompleted, this));
 
   // TODO(hclam): The method is called on the demuxer thread and this method
   // call will block the thread. We need to implemented an additional thread to
   // let FFmpeg demuxer methods to run on.
   int last_read_bytes = WaitForRead();
   if (last_read_bytes == DataSource::kReadError) {
-    if (host())
-      host()->OnDemuxerError(PIPELINE_ERROR_READ);
-    else
-      deferred_status_ = PIPELINE_ERROR_READ;
+    host()->OnDemuxerError(PIPELINE_ERROR_READ);
 
     // Returns with a negative number to signal an error to FFmpeg.
     read_has_failed_ = true;
     return AVERROR(EIO);
   }
   read_position_ += last_read_bytes;
-
-  if (host())
-    host()->SetCurrentReadPosition(read_position_);
+  host()->SetCurrentReadPosition(read_position_);
 
   return last_read_bytes;
 }
 
 bool FFmpegDemuxer::GetPosition(int64* position_out) {
   *position_out = read_position_;
   return true;
 }
 
 bool FFmpegDemuxer::SetPosition(int64 position) {
@@ skipping 18 matching lines @@
 bool FFmpegDemuxer::IsStreaming() {
   DCHECK(data_source_);
 
   return data_source_->IsStreaming();
 }
 
 MessageLoop* FFmpegDemuxer::message_loop() {
   return message_loop_;
 }
 
-void FFmpegDemuxer::InitializeTask(DataSource* data_source,
-                                   const PipelineStatusCB& status_cb) {
+// Helper for calculating the bitrate of the media based on information stored
+// in |format_context| or failing that the size and duration of the media.
+//
+// Returns 0 if a bitrate could not be determined.
+static int CalculateBitrate(
+    AVFormatContext* format_context,
+    const base::TimeDelta& duration,
+    int64 filesize_in_bytes) {
+  // If there is a bitrate set on the container, use it.
+  if (format_context->bit_rate > 0)
+    return format_context->bit_rate;
+
+  // Then try to sum the bitrates individually per stream.
+  int bitrate = 0;
+  for (size_t i = 0; i < format_context->nb_streams; ++i) {
+    AVCodecContext* codec_context = format_context->streams[i]->codec;
+    bitrate += codec_context->bit_rate;
+  }
+  if (bitrate > 0)
+    return bitrate;
+
+  // See if we can approximate the bitrate as long as we have a filesize and
+  // valid duration.
+  if (duration.InMicroseconds() <= 0 ||
+      duration == kInfiniteDuration() ||
+      filesize_in_bytes == 0) {
+    return 0;
+  }
+
+  // Do math in floating point as we'd overflow an int64 if the filesize was
+  // larger than ~1073GB.
+  double bytes = filesize_in_bytes;
+  double duration_us = duration.InMicroseconds();
+  return bytes * 8000000.0 / duration_us;
+}
+
+void FFmpegDemuxer::InitializeTask(const PipelineStatusCB& status_cb) {
   DCHECK_EQ(MessageLoop::current(), message_loop_);
 
-  data_source_ = data_source;
-  if (host())
-    data_source_->set_host(host());
-
   // Add ourself to Protocol list and get our unique key.
   std::string key = FFmpegGlue::GetInstance()->AddProtocol(this);
 
   // Open FFmpeg AVFormatContext.
   DCHECK(!format_context_);
   AVFormatContext* context = NULL;
   int result = avformat_open_input(&context, key.c_str(), NULL, NULL);
 
   // Remove ourself from protocol list.
   FFmpegGlue::GetInstance()->RemoveProtocol(this);
@@ skipping 67 matching lines @@
     max_duration = kInfiniteDuration();
   }
 
   // Some demuxers, like WAV, do not put timestamps on their frames. We
   // assume the the start time is 0.
   if (start_time_ == kNoTimestamp())
     start_time_ = base::TimeDelta();
 
   // Good to go: set the duration and bitrate and notify we're done
   // initializing.
-  if (host())
-    host()->SetDuration(max_duration);
-  max_duration_ = max_duration;
+  host()->SetDuration(max_duration);
 
-  int bitrate = GetBitrate();
-  if (bitrate > 0)
-    data_source_->SetBitrate(bitrate);
+  int64 filesize_in_bytes = 0;
+  GetSize(&filesize_in_bytes);
+  bitrate_ = CalculateBitrate(format_context_, max_duration, filesize_in_bytes);
+  if (bitrate_ > 0)
+    data_source_->SetBitrate(bitrate_);
 
   status_cb.Run(PIPELINE_OK);
 }
 
+
 int FFmpegDemuxer::GetBitrate() {
-  DCHECK(format_context_);
-
-  // If there is a bitrate set on the container, use it.
-  if (format_context_->bit_rate > 0)
-    return format_context_->bit_rate;
-
-  // Then try to sum the bitrates individually per stream.
-  int bitrate = 0;
-  for (size_t i = 0; i < format_context_->nb_streams; ++i) {
-    AVCodecContext* codec_context = format_context_->streams[i]->codec;
-    bitrate += codec_context->bit_rate;
-  }
-  if (bitrate > 0)
-    return bitrate;
-
-  // See if we can approximate the bitrate as long as we have a filesize and
-  // valid duration.
-  int64 filesize_in_bytes;
-  if (max_duration_.InMicroseconds() <= 0 ||
-      max_duration_ == kInfiniteDuration() ||
-      !GetSize(&filesize_in_bytes)) {
-    return 0;
-  }
-
-  // Do math in floating point as we'd overflow an int64 if the filesize was
-  // larger than ~1073GB.
-  double bytes = filesize_in_bytes;
-  double duration = max_duration_.InMicroseconds();
-  return bytes * 8000000.0 / duration;
+  DCHECK(format_context_) << "Initialize() has not been called";
+  return bitrate_;
 }
 
 bool FFmpegDemuxer::IsLocalSource() {
   return local_source_;
 }
 
 bool FFmpegDemuxer::IsSeekable() {
   return !IsStreaming();
 }
 
@@ skipping 140 matching lines @@
   read_event_.Wait();
   return last_read_bytes_;
 }
 
 void FFmpegDemuxer::SignalReadCompleted(int size) {
   last_read_bytes_ = size;
   read_event_.Signal();
 }
 
 }  // namespace media