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|
/*****************************************************************
|
| AP4 - MP4 Audio Info
|
| Copyright 2002-2009 Axiomatic Systems, LLC
|
|
| This file is part of Bento4/AP4 (MP4 Atom Processing Library).
|
| Unless you have obtained Bento4 under a difference license,
| this version of Bento4 is Bento4|GPL.
| Bento4|GPL is free software; you can redistribute it and/or modify
| it under the terms of the GNU General Public License as published by
| the Free Software Foundation; either version 2, or (at your option)
| any later version.
|
| Bento4|GPL is distributed in the hope that it will be useful,
| but WITHOUT ANY WARRANTY; without even the implied warranty of
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
| GNU General Public License for more details.
|
| You should have received a copy of the GNU General Public License
| along with Bento4|GPL; see the file COPYING. If not, write to the
| Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
| 02111-1307, USA.
|
****************************************************************/
#ifndef _AP4_MP4_AUDIO_INFO_H_
#define _AP4_MP4_AUDIO_INFO_H_
/*----------------------------------------------------------------------
| class references
+---------------------------------------------------------------------*/
class AP4_Mp4AudioDsiParser;
/*----------------------------------------------------------------------
| AP4_Mp4DecoderConfig
+---------------------------------------------------------------------*/
/**
* Detailed AAC decoder configuration information.
* This information is necessary in order to create a decoder object.
* It is normally obtained from the DecoderSpecificInfo field of the
* DecoderConfigDescriptor descriptor carried in the sample description
* for the audio samples. See 14496-1, subpart 2, p 2.6.6 for details.
*/
class AP4_Mp4AudioDecoderConfig {
public:
/**
* Channel configuration for multichannel audio buffers.
*/
typedef enum {
CHANNEL_CONFIG_NONE = 0, /**< No channel (not used) */
CHANNEL_CONFIG_MONO = 1, /**< Mono (single audio channel) */
CHANNEL_CONFIG_STEREO = 2, /**< Stereo (Two audio channels) */
CHANNEL_CONFIG_STEREO_PLUS_CENTER = 3, /**< Stereo plus one center channel */
CHANNEL_CONFIG_STEREO_PLUS_CENTER_PLUS_REAR_MONO = 4, /**< Stereo plus one center and one read channel */
CHANNEL_CONFIG_FIVE = 5, /**< Five channels */
CHANNEL_CONFIG_FIVE_PLUS_ONE = 6, /**< Five channels plus one low frequency channel */
CHANNEL_CONFIG_SEVEN_PLUS_ONE = 7, /**< Seven channels plus one low frequency channel */
CHANNEL_CONFIG_UNSUPPORTED
} ChannelConfiguration;
// constructor
AP4_Mp4AudioDecoderConfig();
/**
* Parser a DecoderSpecificInfo buffer
*/
AP4_Result Parse(const AP4_UI08* data, AP4_Size data_size);
/**
* Reset all members to default values (0)
*/
void Reset();
// members
AP4_UI08 m_ObjectType; /**< Type identifier for the audio data */
unsigned int m_SamplingFrequencyIndex; /**< Index of the sampling frequency in the sampling frequency table */
unsigned int m_SamplingFrequency; /**< Sampling frequency */
unsigned int m_ChannelCount; /**< Number of audio channels */
ChannelConfiguration m_ChannelConfiguration; /**< Channel configuration */
bool m_FrameLengthFlag; /**< Frame Length Flag */
bool m_DependsOnCoreCoder; /**< Depends on Core Coder */
unsigned int m_CoreCoderDelay; /**< Core Code delay */
/** Extension details */
struct {
bool m_SbrPresent; /**< SBR is present */
bool m_PsPresent; /**< PS is present */
AP4_UI08 m_ObjectType; /**< Extension object type */
unsigned int m_SamplingFrequencyIndex; /**< Sampling frequency index of the extension */
unsigned int m_SamplingFrequency; /**< Sampling frequency of the extension */
} m_Extension;
private:
AP4_Result ParseAudioObjectType(AP4_Mp4AudioDsiParser& parser, AP4_UI08& object_type);
AP4_Result ParseGASpecificInfo(AP4_Mp4AudioDsiParser& parser);
AP4_Result ParseSamplingFrequency(AP4_Mp4AudioDsiParser& parser,
unsigned int& sampling_frequency_index,
unsigned int& sampling_frequency);
AP4_Result ParseExtension(AP4_Mp4AudioDsiParser& parser);
};
#endif // _AP4_MP4_AUDIO_INFO_H_
|
