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-.TH man 3 "15 Nov 2014" "The Debian Project" "libfaad Documentation"
-.SH "NAME"
-libfaad \- C library for AAC Decoding
-.SH "SYNOPSIS"
-.sp
-.ft B
-.nf
-
-#include <neaacec\&.h>
-
-.HP
-.BI "char NEAACDECAPI *NeAACDecGetErrorMessage(" "" "unsigned char " errcode );
-
-.HP
-.B "unsigned long NEAACDECAPI NeAACDecGetCapabilities(void);"
-
-.HP
-.B "NeAACDecHandle NEAACDECAPI NeAACDecOpen(void);"
-
-.HP
-.B "NeAACDecConfigurationPtr NEAACDECAPI NeAACDecGetCurrentConfiguration("
-.BI "NeAACDecHandle " hDecoder ");"
-
-.HP
-.B "unsigned char NEAACDECAPI NeAACDecSetConfiguration("
-.BI "NeAACDecHandle " "hDecoder" ", NeAACDecConfigurationPtr " config ");"
-
-.HP
-/* Init the library based on info from the AAC file (ADTS/ADIF) */
-.B "long NEAACDECAPI NeAACDecInit("
-.BI "NeAACDecHandle " hDecoder ", unsigned char *" buffer ", unsigned long " "buffer_size" ","
-.BI "unsigned long *" "samplerate" ", unsigned char *" "channels" ");"
-.HP
-/* Init the library using a DecoderSpecificInfo */
-.B "char NEAACDECAPI NeAACDecInit2("
-.BI "NeAACDecHandle " "hDecoder" ", unsigned char *" "pBuffer" ","
-.BI "unsigned long " "SizeOfDecoderSpecificInfo" ","
-.BI "unsigned long *" "samplerate" ", unsigned char *"channels" ");"
-.HP
-/* Init the library for DRM */
-.B "char NEAACDECAPI NeAACDecInitDRM("
-.BI "NeAACDecHandle *" "hDecoder" ", unsigned long " "samplerate" ", unsigned char " "channels" ");"
-.HP
-.B "void NEAACDECAPI NeAACDecPostSeekReset("
-.BI "NeAACDecHandle " "hDecoder" ", long "frame" ");"
-.HP
-.BI "void NEAACDECAPI NeAACDecClose(NeAACDecHandle " "hDecoder" ");"
-.HP
-.B "void NEAACDECAPI *NeAACDecDecode("
-.BI "NeAACDecHandle " "hDecoder" ", NeAACDecFrameInfo *" "hInfo" ","
-.BI "unsigned char *" "buffer" ","
-.BI "unsigned long " "buffer_size" ");"
-.HP
-.B "void NEAACDECAPI *NeAACDecDecode2("
-.BI "NeAACDecHandle " "hDecoder" ", NeAACDecFrameInfo *" "hInfo" ","
-.BI "unsigned char *" "buffer" ", unsigned long " "buffer_size" ","
-.BI "void **" "sample_buffer" ", unsigned long " "sample_buffer_size" ");"
-.HP
-.B "char NEAACDECAPI NeAACDecAudioSpecificConfig("
-.BI "unsigned char *" "pBuffer" ", unsigned long " "buffer_size" ","
-.BI "mp4AudioSpecificConfig *" "mp4ASC" ");"
-.PP
-For normal use link it with the linker option \-lfaad\&.
-.PP
-For Digital Radio Mondiale link it with the linker option \-lfaad_drm\&.
-.sp
-.SH "DESCRIPTION"
-.PP
-.B NeAACDecGetErrorMessage
-.PP
-.B char NEAACDECAPI *NeAACDecGetErrorMessage(unsigned char errcode);
-.PP
-Convert an error code to text.
-.PP
-.B NeAACDecGetCapabilities
-.PP
-unsigned long NEAACAPI NeAACDecGetCapabilities(void);
-.PP
- 
-.PP
-This function returns the capabilities of the decoder in a 32 bit
-unsigned integer.
-The bits that are set in the 32 bit unsigned integer define with which
-capabilities the library has been compiled.
-.PP
-The following capabilities are defined:
-.PP
-\ 
-.PP
-#define LC_DEC_CAP \  \  \  \  \  (1<<0) /* Can decode LC */
-.PP
-#define MAIN_DEC_CAP \  \  \  \  (1<<1) /* Can decode MAIN */
-.PP
-#define LTP_DEC_CAP \  \  \  \  \ (1<<2) /* Can decode LTP */
-.PP
-#define LD_DEC_CAP \  \  \  \  \  (1<<3) /* Can decode LD */
-.PP
-#define ERROR_RESILIENCE_CAP (1<<4) /* Can decode ER */
-.PP
-#define FIXED_POINT_CAP \  \  \ (1<<5) /* Fixed point */
-.PP
-.PP
-This function can be called anytime.
-.PP
-.B NeAACDecOpen 
-.PP NeAACDecHandle NEAACAPI NeAACDecOpen(void);
-.PP
-Returns a handle to a decoder context.
-.PP
-.B NeAACDecClose
-.PP void NEAACAPI NeAACDecClose(NeAACDecHandle hDecoder);
-.PP
-Closes a decoder context that has been opened by NeAACDecOpen.
-.PP
-.B NeAACDecGetCurrentConfiguration
-.PP
-NeAACDecConfigurationPtr NEAACAPI
-NeAACDecGetCurrentConfiguration(NeAACDecHandle hDecoder);
-.PP
-Returns the current decoder library configuration.
-.PP
-.B NeAACDecSetConfiguration
-.PP unsigned char NEAACAPI NeAACDecSetConfiguration(NeAACDecHandle hDecoder, NeAACDecConfigurationPtr config);
-.PP
-.PP
-Sets a new configuration structure for the decoder library.
-.PP
-\ 
-.PP
-Return values:
-.PP 0 \[en] Error, invalid configuration.
-.PP 1 \[en] OK
-.PP
-.B NeAACDecInit
-.PP
-long NEAACAPI NeAACDecInit(NeAACDecHandle hDecoder, unsigned char
-*buffer, unsigned long buffer_size, unsigned long *samplerate, unsigned
-char *channels);
-.PP
-.PP
-.PP
-Initialises the decoder library using information from the AAC file.
-The buffer parameter should hold a small part of the AAC file, so that
-the initialization can be done based on the ADTS or ADIF header.
-Buffer can also be NULL, but then default initialization parameters will
-be used.
-.PP
-Return values:
-.PP
-< 0 \[en] Error
-.PP
->= 0 \[en] Number of bytes read.
-This amount of bytes should be skipped by the program using the decoder
-library.
-.PP
-This function fills the samplerate and channels parameters with the
-detected values.
-.PP
-.B NeAACDecInit2
-.PP
-char NEAACAPI NeAACDecInit2(NeAACDecHandle hDecoder, unsigned char
-*pBuffer, unsigned long SizeOfDecoderSpecificInfo, unsigned long
-*samplerate, unsigned char *channels);
-.PP
-Initialises the decoder library based on an AudioSpecificConfig as found
-inside a MP4 file.
-.PP
-Return values:
-.PP
-< 0 \[en] Error
-.PP
-0 \- OK
-.PP
-This function fills the samplerate and channels parameters with the
-detected values.
-.PP
-.B NeAACDecInitDRM
-.PP
-char NEAACDECAPI NeAACDecInitDRM(NeAACDecHandle *hDecoder, unsigned long samplerate, unsigned char channels);
-.PP
-Initialises the decoder library for Digital Radio Mondiale using the specified sample rate
-and a DRM specific channel configuration.
-.PP
-Return values:
-.PP
-< 0 \[en] Error
-.PP
-0 \- OK
-.PP
-Values for the channel configuration:
-.PP
-#define DRMCH_MONO          1
-.PP
-#define DRMCH_STEREO        2
-.PP
-#define DRMCH_SBR_MONO      3
-.PP
-#define DRMCH_SBR_STEREO    4
-.PP
-#define DRMCH_SBR_PS_STEREO 5
-.PP
-.B NeAACDecDecode
-.PP
-void* NEAACAPI NeAACDecDecode(NeAACDecHandle hDecoder, NeAACDecFrameInfo
-*hInfo, unsigned char *buffer, unsigned long buffer_size);
-.PP
-.PP
-Decodes the AAC data passed in buffer.
-.PP
-Returns a pointer to a sample buffer or NULL.
-Info about the decoded frame is filled in in the NeAACDecFrameInfo
-structure.
-This structure holds information about errors during decoding, number of
-sample, number of channels and samplerate.
-The returned buffer contains the channel interleaved samples of the
-frame.
-.PP
-.B NeAACDecDecode2
-.PP
-void NEAACDECAPI *NeAACDecDecode2(NeAACDecHandle hDecoder,
-                                  NeAACDecFrameInfo *hInfo,
-                                  unsigned char *buffer,
-                                  unsigned long buffer_size,
-                                  void **sample_buffer,
-                                  unsigned long sample_buffer_size);
-
-
-
-.PP
-.B NeAACDecAudioSpecificConfig
-.PP
-char NEAACDECAPI NeAACDecAudioSpecificConfig(unsigned char *pBuffer,
-                                  unsigned long buffer_size,
-                                  mp4AudioSpecificConfig *mp4ASC);
-.PP
-.B Structures
-.RS 4
-.PP NeAACDecConfiguration
-.RE
-.PP
-typedef struct NeAACDecConfiguration
-.PP
-{
-.PP
-\  \  unsigned char defObjectType;
-.PP
-\  \  unsigned long defSampleRate;
-.PP
-\  \  unsigned char outputFormat;
-.PP
-\  \  unsigned char downMatrix;
-.PP
-\  \  unsigned char useOldADTSFormat;
-.PP
-} NeAACDecConfiguration, *NeAACDecConfigurationPtr;
-.PP
-
-.PP
-Members:
-.PP
-defObjectType: determines the default object type assumed when the
-library is initialized without any data from the AAC file (eg: when NULL
-is passed as buffer in NeAACDecInit()).
-Can be any of the following values:
-.PP
-#define MAIN \  \  \  1 /* MAIN */
-.PP
-#define LC \  \  \  \  2 /* Low Complexity (default) */
-.PP
-#define SSR \  \  \  \ 3 /* Scalable SampleRate */
-.PP
-#define LTP \  \  \  \ 4 /* Long Term Predition */
-.PP
-#define HE_AAC \  \  5 /* High Efficiency (SBR) */
-.PP
-#define ER_LC \  \  17 /* Error Resilient Low Complexity */
-.PP
-#define ER_LTP \  \ 19 /* Error Resilient Long Term Prediction */
-.PP
-#define LD \  \  \  \ 23 /* Low Delay */
-.PP
-#define DRM_ER_LC 27 /* special object type for DRM only if linking with \-lfaad_drm */
-.PP
-defSampleRate: determines the default samplerate assumed when the
-library is initialized.
-Default value is 44100.
-.PP
-outputFormat: determines the output format returned by the decoder
-library.
-Can be any of the following values:
-.PP
-#define FAAD_FMT_16BIT \ 1 /* 16 bit integers */
-.PP
-#define FAAD_FMT_24BIT \ 2 /* 24 bit values packed in 32 bit integers */
-.PP
-#define FAAD_FMT_32BIT \ 3 /* 32 bit integers */
-.PP
-#define FAAD_FMT_FLOAT \ 4 /* single precision floating point */
-.PP
-#define FAAD_FMT_DOUBLE 5 /* double precision floating point */
-.PP
-downMatrix: determines whether a 5.1 channel AAC file should be
-downmatrixed to 2 channel output (value: 1) or whether the output should
-stay as 5.1 channels (value: 0).
-.PP
-useOldADTSFormat: determines whether the decoder should assume the
-currently defined 56 bit ADTS header (value: 0) or the 58 bit ADTS
-header (value: 1) defined in previous versions of the AAC standard.
-This value should normally always stay at the value 0, it only exists to
-provide playback capabilities for people that have AAC files with the
-old header format.
-All current encoders should output the new ADTS format.
-NeAACDecFrameInfo\ 
-.PP
-This structure is returned after decoding a frame and provides info
-about the decoded frame.
-.PP
-typedef struct NeAACDecFrameInfo
-.PP
-{
-.PP
-\  \  unsigned long bytesconsumed;
-.PP
-\  \  unsigned long samples;
-.PP
-\  \  unsigned char channels;
-.PP
-\  \  unsigned char error;
-.PP
-\  \  unsigned long samplerate;
-.PP
-\  \  unsigned char sbr;
-.PP
-\  \  unsigned char object_type;
-.PP
-\  \  unsigned char header_type;
-.PP
-\  \  unsigned char num_front_channels;
-.PP
-\  \  unsigned char num_side_channels;
-.PP
-\  \  unsigned char num_back_channels;
-.PP
-\  \  unsigned char num_lfe_channels;
-.PP
-\  \  unsigned char channel_position[64];
-.PP
-\  \  unsigned char ps;
-.PP
-} NeAACDecFrameInfo;
-.PP
-\ 
-.PP
-Members:
-.PP
-bytesconsumed: the number of bytes consumed for decoding this frame.
-.PP
-samples: the number of audio samples in this frame.
-Each channel is counted separately.
-So when a single channel has 1024 samples and the file has 2 channels,
-this value will be 2*1024 = 2048.
-.PP
-channels: number of audio channels in this frame
-.PP
-error: contains an error value if an error occurred, 0 otherwise.
-.PP
-samplerate: the samplerate of the frame.
-.PP
-sbr: tells whether sbr is used in this file or not.
-Can contain any of the following values:
-.PP
-#define NO_SBR \  \  \  \  \  0 /* no SBR used in this file */
-.PP
-#define SBR_UPSAMPLED \  \ 1 /* upsampled SBR used */
-.PP
-#define SBR_DOWNSAMPLED \ 2 /* downsampled SBR used */
-.PP
-#define NO_SBR_UPSAMPLED 3 /* no SBR used, but file is upsampled by a
-factor 2 anyway */
-.PP
-object_type: contains the object type of the AAC file.
-Can be any of the values as defined in 1.9.1.
-.PP
-header_type: contains the header type of the file that is being decoded.
-Can contain any of the following values:
-.PP
-#define RAW \  \  \  \ 0 /* No header */
-.PP
-#define ADIF \  \  \  1 /* single ADIF header at the beginning of the
-file */
-.PP
-#define ADTS \  \  \  2 /* ADTS header at the beginning of each frame */
-.PP
-num_front_channels, num_side_channels, num_back_channels,
-num_lfe_channels: each of these values contain the number of channels of
-a certain type.
-.PP
-channel_position[64]: contains the position of each of the channels that
-is returned by the frame decode function.
-Can contain any of the following values:
-.PP
-#define FRONT_CHANNEL_CENTER (1)
-.PP
-#define FRONT_CHANNEL_LEFT \  (2)
-.PP
-#define FRONT_CHANNEL_RIGHT \ (3)
-.PP
-#define SIDE_CHANNEL_LEFT \  \ (4)
-.PP
-#define SIDE_CHANNEL_RIGHT \  (5)
-.PP
-#define BACK_CHANNEL_LEFT \  \ (6)
-.PP
-#define BACK_CHANNEL_RIGHT \  (7)
-.PP
-#define BACK_CHANNEL_CENTER \ (8)
-.PP
-#define LFE_CHANNEL \  \  \  \  \ (9)
-.PP
-#define UNKNOWN_CHANNEL \  \  \ (0)
-.PP
-ps: PS not used (0) or used (1).
-API usage\ 
-.PP
-The following pseudo\-code describes how and in which order to use the
-different library functions.
-.PP
-\ 
-.PP
-unsigned long cap = NeAACDecGetCapabilities();
-.PP
-// Check if decoder has the needed capabilities
-.PP
-\ 
-.PP
-// Open the library
-.PP
-NeAACDecHandle hAac = NeAACDecOpen();
-.PP
-\ 
-.PP
-// Get the current config
-.PP
-NeAACDecConfigurationPtr conf = NeAACDecGetCurrentConfiguration(hAac);
-.PP
-\ 
-.PP
-//
-.PP
-// If needed change some of the values in conf
-.PP
-//
-.PP
-\ 
-.PP
-// Set the new configuration
-.PP
-NeAACDecSetConfiguration(hAac, conf);
-.PP
-.PP
-// Initialise the library using one of the initialization functions
-.PP
-char err = NeAACDecInit2(hAac, asc, asc_size, &samplerate, &channels);
-.PP
-if (err != 0)
-.PP
-{
-.PP
-\ //
-.PP
-\ // Handle error
-.PP
-\ //
-.PP
-}
-.PP
-\ 
-.PP
-// Loop until decoding finished
-.PP
-do {
-.PP
-\ //
-.PP
-\ // Put next frame in buffer
-.PP
-\ //
-.PP
-\ 
-.PP
-\ // Decode the frame in buffer
-.PP
-\  \  \  \  samplebuffer = NeAACDecDecode(hAac, &hInfo, buffer,
-.PP
-buffer_size);
-.PP
-\ 
-.PP
-if ((hInfo.error == 0) && (hInfo.samples > 0))
-.PP
-{
-.PP
-\ //
-.PP
-\ // do what you need to do with the decoded samples
-.PP
-\ //
-.PP
-} else if (hInfo.error != 0) {
-.PP
-\ //
-.PP
-\ // Some error occurred while decoding this frame
-.PP
-\ //
-.PP
-}
-.PP
-} while (more data available);
-.PP
-\ 
-.PP
-NeAACDecClose(hAac);
-.SH "SEE ALSO"
-.PP
-\fBlibfaad_drm\fR(3),
-\fBlibfaac\fR(3)\&.
-.SH "AUTHOR"
-.PP
-Menno Bakker <mbakker@nero.com>
-.PP Man Page by Julian Cable <jcable@users.sf.net>