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// Copyright 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.
// A fake media source that generates video and audio frames to a cast
// sender.
// This class can transcode a WebM file using FFmpeg. It can also
// generate an animation and audio of fixed frequency.
#include <stdint.h>
#include "base/containers/queue.h"
#include "base/files/file_path.h"
#include "base/files/memory_mapped_file.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "base/single_thread_task_runner.h"
#include "base/time/tick_clock.h"
#include "media/base/audio_converter.h"
#include "media/base/audio_parameters.h"
#include "media/cast/cast_config.h"
#include "media/filters/audio_renderer_algorithm.h"
#include "media/filters/ffmpeg_demuxer.h"
struct AVCodecContext;
struct AVFormatContext;
struct AVFrame;
namespace media {
class AudioBus;
class AudioConverter;
class AudioFifo;
class AudioTimestampHelper;
class FFmpegGlue;
class FFmpegDecodingLoop;
class InMemoryUrlProtocol;
class VideoFrame;
struct ScopedPtrAVFreeContext;
namespace cast {
class AudioFrameInput;
class VideoFrameInput;
class TestAudioBusFactory;
class FakeMediaSource : public media::AudioConverter::InputCallback {
// |task_runner| is to schedule decoding tasks.
// |clock| is used by this source but is not owned.
// |audio_config| is the desired audio config.
// |video_config| is the desired video config.
// |keep_frames| is true if all VideoFrames are saved in a queue.
FakeMediaSource(scoped_refptr<base::SingleThreadTaskRunner> task_runner,
const base::TickClock* clock,
const FrameSenderConfig& audio_config,
const FrameSenderConfig& video_config,
bool keep_frames);
~FakeMediaSource() final;
// Transcode this file as the source of video and audio frames.
// If |final_fps| is non zero then the file is played at the desired rate.
void SetSourceFile(const base::FilePath& video_file, int final_fps);
// Set to true to randomly change the frame size at random points in time.
// Only applies when SetSourceFile() is not used.
void SetVariableFrameSizeMode(bool enabled);
void Start(scoped_refptr<AudioFrameInput> audio_frame_input,
scoped_refptr<VideoFrameInput> video_frame_input);
const FrameSenderConfig& get_video_config() const { return video_config_; }
scoped_refptr<media::VideoFrame> PopOldestInsertedVideoFrame();
bool is_transcoding_audio() const { return audio_stream_index_ >= 0; }
bool is_transcoding_video() const { return video_stream_index_ >= 0; }
void SendNextFrame();
void SendNextFakeFrame();
void UpdateNextFrameSize();
// Return true if a frame was sent.
bool SendNextTranscodedVideo(base::TimeDelta elapsed_time);
// Return true if a frame was sent.
bool SendNextTranscodedAudio(base::TimeDelta elapsed_time);
// Helper methods to compute timestamps for the frame number specified.
base::TimeDelta VideoFrameTime(int frame_number);
base::TimeDelta ScaleTimestamp(base::TimeDelta timestamp);
base::TimeDelta AudioFrameTime(int frame_number);
// Go to the beginning of the stream.
void Rewind();
// Call FFmpeg to fetch one packet.
ScopedAVPacket DemuxOnePacket(bool* audio);
void DecodeAudio(ScopedAVPacket packet);
bool OnNewAudioFrame(AVFrame* frame);
void DecodeVideo(ScopedAVPacket packet);
bool OnNewVideoFrame(AVFrame* frame);
void Decode(bool decode_audio);
// media::AudioConverter::InputCallback implementation.
double ProvideInput(media::AudioBus* output_bus,
uint32_t frames_delayed) final;
AVStream* av_audio_stream();
AVStream* av_video_stream();
const scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
const media::AudioParameters output_audio_params_;
const FrameSenderConfig video_config_;
const bool keep_frames_;
bool variable_frame_size_mode_;
gfx::Size current_frame_size_;
base::TimeTicks next_frame_size_change_time_;
scoped_refptr<AudioFrameInput> audio_frame_input_;
scoped_refptr<VideoFrameInput> video_frame_input_;
uint8_t synthetic_count_;
const base::TickClock* const clock_; // Not owned by this class.
// Time when the stream starts.
base::TimeTicks start_time_;
// The following three members are used only for fake frames.
int audio_frame_count_; // Each audio frame is exactly 10ms.
int video_frame_count_;
std::unique_ptr<TestAudioBusFactory> audio_bus_factory_;
base::MemoryMappedFile file_data_;
std::unique_ptr<InMemoryUrlProtocol> protocol_;
std::unique_ptr<FFmpegGlue> glue_;
AVFormatContext* av_format_context_;
int audio_stream_index_;
std::unique_ptr<AVCodecContext, ScopedPtrAVFreeContext> av_audio_context_;
std::unique_ptr<FFmpegDecodingLoop> audio_decoding_loop_;
AudioParameters source_audio_params_;
double playback_rate_;
int video_stream_index_;
std::unique_ptr<AVCodecContext, ScopedPtrAVFreeContext> av_video_context_;
std::unique_ptr<FFmpegDecodingLoop> video_decoding_loop_;
int video_frame_rate_numerator_;
int video_frame_rate_denominator_;
// These are used for audio resampling.
std::unique_ptr<media::AudioConverter> audio_converter_;
std::unique_ptr<media::AudioFifo> audio_fifo_;
std::unique_ptr<media::AudioBus> audio_fifo_input_bus_;
media::AudioRendererAlgorithm audio_algo_;
// Track the timestamp of audio sent to the receiver.
std::unique_ptr<media::AudioTimestampHelper> audio_sent_ts_;
base::queue<scoped_refptr<VideoFrame>> video_frame_queue_;
base::queue<scoped_refptr<VideoFrame>> inserted_video_frame_queue_;
int64_t video_first_pts_;
bool video_first_pts_set_;
base::TimeDelta last_video_frame_timestamp_;
base::queue<AudioBus*> audio_bus_queue_;
// NOTE: Weak pointers must be invalidated before all other member variables.
base::WeakPtrFactory<FakeMediaSource> weak_factory_{this};
} // namespace cast
} // namespace media