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// Copyright 2013 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_CDM_LIBRARY_CDM_CLEAR_KEY_CDM_FFMPEG_CDM_AUDIO_DECODER_H_
#define MEDIA_CDM_LIBRARY_CDM_CLEAR_KEY_CDM_FFMPEG_CDM_AUDIO_DECODER_H_
#include <stdint.h>
#include <memory>
#include <vector>
#include "base/compiler_specific.h"
#include "base/macros.h"
#include "base/time/time.h"
#include "media/base/timestamp_constants.h"
#include "media/cdm/api/content_decryption_module.h"
#include "media/ffmpeg/ffmpeg_deleters.h"
struct AVCodecContext;
struct AVFrame;
namespace media {
class AudioTimestampHelper;
class CdmHostProxy;
class FFmpegDecodingLoop;
// TODO(xhwang): This class is partially cloned from FFmpegAudioDecoder. When
// FFmpegAudioDecoder is updated, it's a pain to keep this class in sync with
// FFmpegAudioDecoder. We need a long term sustainable solution for this. See
// http://crbug.com/169203
class FFmpegCdmAudioDecoder {
public:
explicit FFmpegCdmAudioDecoder(CdmHostProxy* cdm_host_proxy);
~FFmpegCdmAudioDecoder();
bool Initialize(const cdm::AudioDecoderConfig_2& config);
void Deinitialize();
void Reset();
// Decodes |compressed_buffer|. Returns |cdm::kSuccess| after storing
// output in |decoded_frames| when output is available. Returns
// |cdm::kNeedMoreData| when |compressed_frame| does not produce output.
// Returns |cdm::kDecodeError| when decoding fails.
//
// A null |compressed_buffer| will attempt to flush the decoder of any
// remaining frames. |compressed_buffer_size| and |timestamp| are ignored.
cdm::Status DecodeBuffer(const uint8_t* compressed_buffer,
int32_t compressed_buffer_size,
int64_t timestamp,
cdm::AudioFrames* decoded_frames);
private:
bool OnNewFrame(
size_t* total_size,
std::vector<std::unique_ptr<AVFrame, ScopedPtrAVFreeFrame>>* audio_frames,
AVFrame* frame);
void ResetTimestampState();
void ReleaseFFmpegResources();
void SerializeInt64(int64_t value, uint8_t* dest);
bool is_initialized_ = false;
CdmHostProxy* const cdm_host_proxy_ = nullptr;
// FFmpeg structures owned by this object.
std::unique_ptr<AVCodecContext, ScopedPtrAVFreeContext> codec_context_;
std::unique_ptr<FFmpegDecodingLoop> decoding_loop_;
// Audio format.
int samples_per_second_ = 0;
int channels_ = 0;
// AVSampleFormat initially requested; not Chrome's SampleFormat.
int av_sample_format_ = 0;
// Used for computing output timestamps.
std::unique_ptr<AudioTimestampHelper> output_timestamp_helper_;
int bytes_per_frame_ = 0;
base::TimeDelta last_input_timestamp_ = kNoTimestamp;
DISALLOW_COPY_AND_ASSIGN(FFmpegCdmAudioDecoder);
};
} // namespace media
#endif // MEDIA_CDM_LIBRARY_CDM_CLEAR_KEY_CDM_FFMPEG_CDM_AUDIO_DECODER_H_
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