blob: f961f40d64fe87141cdc9f4ab10ab50a6c198bdf [file] [log] [blame]
// Copyright (c) 2011 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.
#ifndef MEDIA_FILTERS_FFMPEG_AUDIO_DECODER_H_
#define MEDIA_FILTERS_FFMPEG_AUDIO_DECODER_H_
#include <list>
#include "base/message_loop.h"
#include "media/base/filters.h"
struct AVCodecContext;
namespace media {
class DataBuffer;
class MEDIA_EXPORT FFmpegAudioDecoder : public AudioDecoder {
public:
explicit FFmpegAudioDecoder(MessageLoop* message_loop);
virtual ~FFmpegAudioDecoder();
// Filter implementation.
virtual void Flush(const base::Closure& callback) OVERRIDE;
// AudioDecoder implementation.
virtual void Initialize(DemuxerStream* stream, const base::Closure& callback,
const StatisticsCallback& stats_callback) OVERRIDE;
virtual void ProduceAudioSamples(scoped_refptr<Buffer> output) OVERRIDE;
virtual int bits_per_channel() OVERRIDE;
virtual ChannelLayout channel_layout() OVERRIDE;
virtual int samples_per_second() OVERRIDE;
private:
// Methods running on decoder thread.
void DoInitialize(const scoped_refptr<DemuxerStream>& stream,
const base::Closure& callback,
const StatisticsCallback& stats_callback);
void DoFlush(const base::Closure& callback);
void DoProduceAudioSamples(const scoped_refptr<Buffer>& output);
void DoDecodeBuffer(const scoped_refptr<Buffer>& input);
// Reads from the demuxer stream with corresponding callback method.
void ReadFromDemuxerStream();
void DecodeBuffer(Buffer* buffer);
// Updates the output buffer's duration and timestamp based on the input
// buffer. Will fall back to an estimated timestamp if the input lacks a
// valid timestamp.
void UpdateDurationAndTimestamp(const Buffer* input, DataBuffer* output);
// Calculates duration based on size of decoded audio bytes.
base::TimeDelta CalculateDuration(int size);
MessageLoop* message_loop_;
scoped_refptr<DemuxerStream> demuxer_stream_;
StatisticsCallback stats_callback_;
AVCodecContext* codec_context_;
// Decoded audio format.
int bits_per_channel_;
ChannelLayout channel_layout_;
int samples_per_second_;
base::TimeDelta estimated_next_timestamp_;
// Holds decoded audio. As required by FFmpeg, input/output buffers should
// be allocated with suitable padding and alignment. av_malloc() provides
// us that guarantee.
const int decoded_audio_size_;
uint8* decoded_audio_; // Allocated via av_malloc().
// Holds downstream-provided buffers.
std::list<scoped_refptr<Buffer> > output_buffers_;
// Tracks reads issued for compressed data.
int pending_reads_;
DISALLOW_IMPLICIT_CONSTRUCTORS(FFmpegAudioDecoder);
};
} // namespace media
#endif // MEDIA_FILTERS_FFMPEG_AUDIO_DECODER_H_