Audio frame
[Audio]

Container for audio data. More...


Data Structures

union  gavl_audio_samples_t
 Container for interleaved audio samples. More...
union  gavl_audio_channels_t
 Container for noninterleaved audio samples. More...
struct  gavl_audio_frame_t
 Generic container for audio samples. More...

Functions

gavl_audio_frame_tgavl_audio_frame_create (const gavl_audio_format_t *format)
 Create audio frame.
void gavl_audio_frame_null (gavl_audio_frame_t *frame)
 Zero all pointers in the audio frame.
void gavl_audio_frame_destroy (gavl_audio_frame_t *frame)
 Destroy an audio frame.
void gavl_audio_frame_mute (gavl_audio_frame_t *frame, const gavl_audio_format_t *format)
 Mute an audio frame.
void gavl_audio_frame_mute_samples (gavl_audio_frame_t *frame, const gavl_audio_format_t *format, int num_samples)
 Mute a number of samples at the start of an audio frame.
void gavl_audio_frame_mute_channel (gavl_audio_frame_t *frame, const gavl_audio_format_t *format, int channel)
 Mute a single channel of an audio frame.
int gavl_audio_frame_copy (const gavl_audio_format_t *format, gavl_audio_frame_t *dst, const gavl_audio_frame_t *src, int dst_pos, int src_pos, int dst_size, int src_size)
 Copy audio data from one frame to another.


Detailed Description

Container for audio data.

Function Documentation

gavl_audio_frame_t* gavl_audio_frame_create ( const gavl_audio_format_t format  ) 

Create audio frame.

Parameters:
format Format of the data to be stored in this frame or NULL
Creates an audio frame for a given format and allocates buffers for the audio data. The buffer size is determined by the samples_per_frame member of the format. To create an audio frame from your custom memory, pass NULL for the format and you'll get an empty frame in which you can set the pointers manually.

void gavl_audio_frame_null ( gavl_audio_frame_t frame  ) 

Zero all pointers in the audio frame.

Parameters:
frame An audio frame
Zero all pointers, so gavl_audio_frame_destroy won't free them. Call this for audio frames, which were created with a NULL format before destroying them.

void gavl_audio_frame_destroy ( gavl_audio_frame_t frame  ) 

Destroy an audio frame.

Parameters:
frame An audio frame
Destroys an audio frame and frees all associated memory. If you used your custom memory to allocate the frame, call gavl_audio_frame_null before.

void gavl_audio_frame_mute ( gavl_audio_frame_t frame,
const gavl_audio_format_t format 
)

Mute an audio frame.

Parameters:
frame An audio frame
format The format of the frame
Fills the frame with digital zero samples according to the audio format

void gavl_audio_frame_mute_samples ( gavl_audio_frame_t frame,
const gavl_audio_format_t format,
int  num_samples 
)

Mute a number of samples at the start of an audio frame.

Parameters:
frame An audio frame
format The format of the frame
num_samples Number of samples to mute
Fills the frame with digital zero samples according to the audio format

void gavl_audio_frame_mute_channel ( gavl_audio_frame_t frame,
const gavl_audio_format_t format,
int  channel 
)

Mute a single channel of an audio frame.

Parameters:
frame An audio frame
format The format of the frame
channel The channel to mute
Fills the frame with digital zero samples according to the audio format

int gavl_audio_frame_copy ( const gavl_audio_format_t format,
gavl_audio_frame_t dst,
const gavl_audio_frame_t src,
int  dst_pos,
int  src_pos,
int  dst_size,
int  src_size 
)

Copy audio data from one frame to another.

Parameters:
format Format, must be equal for source and destination frames
dst Destination frame
src Source frame
dst_pos Offset (in samples) in the destination frame
src_pos Offset (in samples) in the source frame
dst_size Available samples in the destination frame
src_size Available samples in the source frame
Returns:
The actual number of copied samples
This function copies audio samples from src (starting at src_offset) to dst (starting at dst_offset). The number of copied samples will be the smaller one of src_size and dst_size.

You can use this function for creating a simple but effective audio buffer.


Generated on Thu Apr 9 21:03:25 2009 for gavl by  doxygen 1.5.7.1