blob: 1cabb4371fff401be839e6df554416e854d52999 [file] [log] [blame]
// 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.
#include <vector>
#include "build/build_config.h"
#include "cobalt/media/base/channel_layout.h"
#include "cobalt/media/base/media_export.h"
#include "cobalt/media/base/media_log.h"
#include "starboard/types.h"
namespace cobalt {
namespace media {
class BitReader;
namespace mp4 {
// This class parses the AAC information from decoder specific information
// embedded in the esds box in an ISO BMFF file.
// Please refer to ISO 14496 Part 3 Table 1.13 - Syntax of AudioSpecificConfig
// for more details.
AAC(const AAC& other);
// Parse the AAC config from the raw binary data embedded in esds box.
// The function will parse the data and get the ElementaryStreamDescriptor,
// then it will parse the ElementaryStreamDescriptor to get audio stream
// configurations.
bool Parse(const std::vector<uint8_t>& data,
const scoped_refptr<MediaLog>& media_log);
// Gets the output sample rate for the AAC stream.
// |sbr_in_mimetype| should be set to true if the SBR mode is
// signalled in the mimetype. (ie mp4a.40.5 in the codecs parameter).
// Returns the samples_per_second value that should used in an
// AudioDecoderConfig.
int GetOutputSamplesPerSecond(bool sbr_in_mimetype) const;
// Gets the channel layout for the AAC stream.
// |sbr_in_mimetype| should be set to true if the SBR mode is
// signalled in the mimetype. (ie mp4a.40.5 in the codecs parameter).
// Returns the channel_layout value that should used in an
// AudioDecoderConfig.
ChannelLayout GetChannelLayout(bool sbr_in_mimetype) const;
// This function converts a raw AAC frame into an AAC frame with an ADTS
// header. On success, the function returns true and stores the converted data
// in the buffer. The function returns false on failure and leaves the buffer
// unchanged.
bool ConvertEsdsToADTS(std::vector<uint8_t>* buffer) const;
// Returns the codec specific data needed by android MediaCodec.
std::vector<uint8_t> codec_specific_data() const {
return codec_specific_data_;
bool SkipDecoderGASpecificConfig(BitReader* bit_reader) const;
bool SkipErrorSpecificConfig() const;
bool SkipGASpecificConfig(BitReader* bit_reader) const;
// The following variables store the AAC specific configuration information
// that are used to generate the ADTS header.
uint8_t profile_;
uint8_t frequency_index_;
uint8_t channel_config_;
// The codec specific data needed by the android MediaCodec.
std::vector<uint8_t> codec_specific_data_;
// The following variables store audio configuration information that
// can be used by Chromium. They are based on the AAC specific
// configuration but can be overridden by extensions in elementary
// stream descriptor.
int frequency_;
int extension_frequency_;
ChannelLayout channel_layout_;
} // namespace mp4
} // namespace media
} // namespace cobalt