blob: 6a3fd89ab913c2bf045bf411c7e2e153a76052ba [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.
#include <vector>
#include "media/filters/ffmpeg_glue.h"
struct AVCodec;
struct AVCodecContext;
struct AVFormatContext;
namespace base { class TimeDelta; }
namespace media {
class FFmpegURLProtocol;
class MEDIA_EXPORT AudioFileReader {
// Audio file data will be read using the given protocol.
// The AudioFileReader does not take ownership of |protocol| and
// simply maintains a weak reference to it.
explicit AudioFileReader(FFmpegURLProtocol* protocol);
virtual ~AudioFileReader();
// Open() reads the audio data format so that the sample_rate(),
// channels(), duration(), and number_of_frames() methods can be called.
// It returns |true| on success.
bool Open();
void Close();
// After a call to Open(), reads |number_of_frames| into |audio_data|.
// |audio_data| must be of the same size as channels().
// The audio data will be decoded as floating-point linear PCM with
// a nominal range of -1.0 -> +1.0.
// Returns |true| on success.
bool Read(const std::vector<float*>& audio_data, size_t number_of_frames);
// These methods can be called once Open() has been called.
int channels() const;
int sample_rate() const;
base::TimeDelta duration() const;
int64 number_of_frames() const;
FFmpegURLProtocol* protocol_;
AVFormatContext* format_context_;
AVCodecContext* codec_context_;
AVCodec* codec_;
} // namespace media