shaka::media::AACAudioSpecificConfig Class Reference

#include <aac_audio_specific_config.h>

Public Types
enum	AudioObjectType {   AOT_NULL = 0, AOT_AAC_MAIN = 1, AOT_AAC_LC = 2, AOT_AAC_SSR = 3,   AOT_AAC_LTP = 4, AOT_SBR = 5, AOT_AAC_SCALABLE = 6, AOT_TWINVQ = 7,   AOT_CELP = 8, AOT_HVXC = 9, AOT_TTSI = 12, AOT_MAINSYNTH = 13,   AOT_WAVESYNTH = 14, AOT_MIDI = 15, AOT_SAFX = 16, AOT_ER_AAC_LC = 17,   AOT_ER_AAC_LTP = 19, AOT_ER_AAC_SCALABLE = 20, AOT_ER_TWINVQ = 21, AOT_ER_BSAC = 22,   AOT_ER_AAC_LD = 23, AOT_ER_CELP = 24, AOT_ER_HVXC = 25, AOT_ER_HILN = 26,   AOT_ER_PARAM = 27, AOT_SSC = 28, AOT_PS = 29, AOT_SURROUND = 30,   AOT_ESCAPE = 31, AOT_L1 = 32, AOT_L2 = 33, AOT_L3 = 34,   AOT_DST = 35, AOT_ALS = 36, AOT_SLS = 37, AOT_SLS_NON_CORE = 38,   AOT_ER_AAC_ELD = 39, AOT_SMR_SIMPLE = 40, AOT_SMR_MAIN = 41, AOT_USAC_NOSBR = 42,   AOT_SAOC = 43, AOT_LD_SURROUND = 44, AOT_USAC = 45 }

Public Member Functions
virtual bool	Parse (const std::vector< uint8_t > &data)
virtual bool	ConvertToADTS (std::vector< uint8_t > *buffer) const
AudioObjectType	GetAudioObjectType () const
uint32_t	GetSamplesPerSecond () const
uint8_t	GetNumChannels () const
bool	sbr_present () const
void	set_sbr_present (bool sbr_present)
	Indicate whether SBR is present in the stream.

Static Public Attributes
static const size_t	kADTSHeaderSize = 7
	Size in bytes of the ADTS header added by ConvertEsdsToADTS().

Detailed Description

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.

Definition at line 23 of file aac_audio_specific_config.h.

Member Function Documentation

bool shaka::media::AACAudioSpecificConfig::ConvertToADTS ( std::vector< uint8_t > *  buffer ) const

virtual

Convert a raw AAC frame into an AAC frame with an ADTS header.

Parameters

[in,out]

buffer

contains the raw AAC frame on input, and the converted frame on output if successful; it is untouched on failure.

Returns

true on success, false otherwise.

Definition at line 124 of file aac_audio_specific_config.cc.

AACAudioSpecificConfig::AudioObjectType shaka::media::AACAudioSpecificConfig::GetAudioObjectType

(

)

const

Returns

The audio object type for this AAC config, with possible extension considered.

Definition at line 150 of file aac_audio_specific_config.cc.

uint8_t shaka::media::AACAudioSpecificConfig::GetNumChannels

(

)

const

Returns

Number of channels for the AAC stream, with possible extensions considered.

Definition at line 172 of file aac_audio_specific_config.cc.

uint32_t shaka::media::AACAudioSpecificConfig::GetSamplesPerSecond

(

)

const

Returns

Sample rate for the AAC stream, with possible extensions considered.

Definition at line 158 of file aac_audio_specific_config.cc.

bool shaka::media::AACAudioSpecificConfig::Parse ( const std::vector< uint8_t > &  data )

virtual

Parse the AAC config from decoder specific information embedded in an esds box. The function will parse the data and get the ElementaryStreamDescriptor, then it will parse the ElementaryStreamDescriptor to get audio stream configurations.

Parameters

data	contains decoder specific information from an esds box.

Returns

true if successful, false otherwise.

Definition at line 32 of file aac_audio_specific_config.cc.

bool shaka::media::AACAudioSpecificConfig::sbr_present ( ) const

inline

Returns

whether Spectral Band Repliation (SBR) is present in the stream.

Definition at line 109 of file aac_audio_specific_config.h.

---

The documentation for this class was generated from the following files:

• packager/media/codecs/aac_audio_specific_config.h
• packager/media/codecs/aac_audio_specific_config.cc