73 lines
2.4 KiB
C++
73 lines
2.4 KiB
C++
// Copyright 2014 Google Inc. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file or at
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// https://developers.google.com/open-source/licenses/bsd
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#ifndef MEDIA_FORMATS_MP2T_ADTS_HEADER_H_
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#define MEDIA_FORMATS_MP2T_ADTS_HEADER_H_
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#include "base/basictypes.h"
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#include <vector>
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namespace media {
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namespace mp2t {
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/// Class which parses ADTS headers and synthesizes AudioSpecificConfig
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/// and audio mime type from ADTS header contents.
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class AdtsHeader {
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public:
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AdtsHeader();
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~AdtsHeader() {}
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/// Get the size of the ADTS frame from a partial or complete frame.
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/// @param data is a pointer to the beginning of the ADTS frame.
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/// @param num_bytes is the number of data bytes at @a data.
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/// @return Size of the ADTS frame (header + payload) if successful, or
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/// zero otherwise.
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static size_t GetAdtsFrameSize(const uint8* data, size_t num_bytes);
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/// Get the size of the ADTS header from a partial or complete frame.
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/// @param data is a pointer to the beginning of the ADTS frame.
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/// @param num_bytes is the number of data bytes at @a data.
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/// @return Size of the ADTS header if successful, or zero otherwise.
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static size_t GetAdtsHeaderSize(const uint8* data, size_t num_bytes);
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/// Parse an ADTS header, extracting the fields within.
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/// @param adts_frame is an input parameter pointing to the ADTS header
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/// of an ADTS-framed audio sample.
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/// @param adts_frame_size is the size, in bytes of the input ADTS frame.
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/// @return true if successful, false otherwise.
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bool Parse(const uint8* adts_frame, size_t adts_frame_size);
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/// Synthesize an AudioSpecificConfig record from the fields within the ADTS
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/// header.
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/// @param [out] buffer is a pointer to a vector to contain the
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/// AudioSpecificConfig.
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/// @return true if successful, false otherwise.
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bool GetAudioSpecificConfig(std::vector<uint8>* buffer) const;
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/// @return The audio profile for this ADTS frame.
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uint8 GetObjectType() const;
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/// @return The sampling frequency for this ADTS frame.
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uint32 GetSamplingFrequency() const;
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/// @return Number of channels for this AAC config.
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uint8 GetNumChannels() const;
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private:
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bool valid_config_;
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uint8 profile_;
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uint8 sampling_frequency_index_;
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uint8 channel_configuration_;
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DISALLOW_COPY_AND_ASSIGN(AdtsHeader);
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};
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} // namespace mp2t
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} // namespace media
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#endif // MEDIA_FORMATS_MP2T_ADTS_HEADER_H_
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