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82 lines
2.8 KiB
C++
82 lines
2.8 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef MEDIA_MP4_AAC_H_
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#define MEDIA_MP4_AAC_H_
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#include <vector>
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#include "mp4_demuxer/basictypes.h"
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#include "mp4_demuxer/channel_layout.h"
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namespace mp4_demuxer {
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class BitReader;
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// This class parses the AAC information from decoder specific information
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// embedded in the esds box in an ISO BMFF file.
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// Please refer to ISO 14496 Part 3 Table 1.13 - Syntax of AudioSpecificConfig
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// for more details.
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class AAC {
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public:
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AAC();
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~AAC();
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// Parse the AAC config from the raw binary data embedded in esds box.
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// The function will parse the data and get the ElementaryStreamDescriptor,
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// then it will parse the ElementaryStreamDescriptor to get audio stream
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// configurations.
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bool Parse(const std::vector<uint8_t>& data);
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// Gets the output sample rate for the AAC stream.
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// |sbr_in_mimetype| should be set to true if the SBR mode is
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// signalled in the mimetype. (ie mp4a.40.5 in the codecs parameter).
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// Returns the samples_per_second value that should used in an
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// AudioDecoderConfig.
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int GetOutputSamplesPerSecond(bool sbr_in_mimetype) const;
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// Gets the channel layout for the AAC stream.
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// |sbr_in_mimetype| should be set to true if the SBR mode is
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// signalled in the mimetype. (ie mp4a.40.5 in the codecs parameter).
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// Returns the channel_layout value that should used in an
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// AudioDecoderConfig.
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ChannelLayout GetChannelLayout(bool sbr_in_mimetype) const;
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// This function converts a raw AAC frame into an AAC frame with an ADTS
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// header. On success, the function returns true and stores the converted data
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// in the buffer. The function returns false on failure and leaves the buffer
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// unchanged.
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bool ConvertEsdsToADTS(std::vector<uint8_t>* buffer) const;
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// Size in bytes of the ADTS header added by ConvertEsdsToADTS().
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static const size_t kADTSHeaderSize = 7;
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const std::vector<uint8_t>& AudioSpecificConfig() const;
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private:
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bool SkipDecoderGASpecificConfig(BitReader* bit_reader) const;
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bool SkipErrorSpecificConfig() const;
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bool SkipGASpecificConfig(BitReader* bit_reader) const;
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// The following variables store the AAC specific configuration information
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// that are used to generate the ADTS header.
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uint8_t profile_;
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uint8_t frequency_index_;
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uint8_t channel_config_;
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// The following variables store audio configuration information that
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// can be used by Chromium. They are based on the AAC specific
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// configuration but can be overridden by extensions in elementary
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// stream descriptor.
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int frequency_;
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int extension_frequency_;
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ChannelLayout channel_layout_;
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std::vector<uint8_t> audio_specific_config_;
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};
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} // namespace mp4_demuxer
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#endif // MEDIA_MP4_AAC_H_
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