FFmpeg
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Functions that manipulate audio samples. More...
Functions | |
int | av_samples_fill_arrays (uint8_t **audio_data, int *linesize, const uint8_t *buf, int nb_channels, int nb_samples, enum AVSampleFormat sample_fmt, int align) |
Fill plane data pointers and linesize for samples with sample format sample_fmt. More... | |
int | av_samples_alloc (uint8_t **audio_data, int *linesize, int nb_channels, int nb_samples, enum AVSampleFormat sample_fmt, int align) |
Allocate a samples buffer for nb_samples samples, and fill data pointers and linesize accordingly. More... | |
int | av_samples_alloc_array_and_samples (uint8_t ***audio_data, int *linesize, int nb_channels, int nb_samples, enum AVSampleFormat sample_fmt, int align) |
Allocate a data pointers array, samples buffer for nb_samples samples, and fill data pointers and linesize accordingly. More... | |
int | av_samples_copy (uint8_t **dst, uint8_t *const *src, int dst_offset, int src_offset, int nb_samples, int nb_channels, enum AVSampleFormat sample_fmt) |
Copy samples from src to dst. More... | |
int | av_samples_set_silence (uint8_t **audio_data, int offset, int nb_samples, int nb_channels, enum AVSampleFormat sample_fmt) |
Fill an audio buffer with silence. More... | |
Functions that manipulate audio samples.
int av_samples_fill_arrays | ( | uint8_t ** | audio_data, |
int * | linesize, | ||
const uint8_t * | buf, | ||
int | nb_channels, | ||
int | nb_samples, | ||
enum AVSampleFormat | sample_fmt, | ||
int | align | ||
) |
Fill plane data pointers and linesize for samples with sample format sample_fmt.
The audio_data array is filled with the pointers to the samples data planes: for planar, set the start point of each channel's data within the buffer, for packed, set the start point of the entire buffer only.
The value pointed to by linesize is set to the aligned size of each channel's data buffer for planar layout, or to the aligned size of the buffer for all channels for packed layout.
The buffer in buf must be big enough to contain all the samples (use av_samples_get_buffer_size() to compute its minimum size), otherwise the audio_data pointers will point to invalid data.
[out] | audio_data | array to be filled with the pointer for each channel |
[out] | linesize | calculated linesize, may be NULL |
buf | the pointer to a buffer containing the samples | |
nb_channels | the number of channels | |
nb_samples | the number of samples in a single channel | |
sample_fmt | the sample format | |
align | buffer size alignment (0 = default, 1 = no alignment) |
Definition at line 151 of file samplefmt.c.
Referenced by allocate_buffers(), av_samples_alloc(), avcodec_fill_audio_frame(), ff_audio_data_realloc(), main(), and tak_decode_frame().
int av_samples_alloc | ( | uint8_t ** | audio_data, |
int * | linesize, | ||
int | nb_channels, | ||
int | nb_samples, | ||
enum AVSampleFormat | sample_fmt, | ||
int | align | ||
) |
Allocate a samples buffer for nb_samples samples, and fill data pointers and linesize accordingly.
The allocated samples buffer can be freed by using av_freep(&audio_data[0]) Allocated data will be initialized to silence.
[out] | audio_data | array to be filled with the pointer for each channel |
[out] | linesize | aligned size for audio buffer(s), may be NULL |
nb_channels | number of audio channels | |
nb_samples | number of samples per channel | |
align | buffer size alignment (0 = default, 1 = no alignment) |
Definition at line 173 of file samplefmt.c.
Referenced by av_samples_alloc_array_and_samples(), ff_audio_data_realloc(), init_converted_samples(), and main().
int av_samples_alloc_array_and_samples | ( | uint8_t *** | audio_data, |
int * | linesize, | ||
int | nb_channels, | ||
int | nb_samples, | ||
enum AVSampleFormat | sample_fmt, | ||
int | align | ||
) |
Allocate a data pointers array, samples buffer for nb_samples samples, and fill data pointers and linesize accordingly.
This is the same as av_samples_alloc(), but also allocates the data pointers array.
Definition at line 198 of file samplefmt.c.
Referenced by config_input(), config_output(), and main().
int av_samples_copy | ( | uint8_t ** | dst, |
uint8_t *const * | src, | ||
int | dst_offset, | ||
int | src_offset, | ||
int | nb_samples, | ||
int | nb_channels, | ||
enum AVSampleFormat | sample_fmt | ||
) |
Copy samples from src to dst.
dst | destination array of pointers to data planes |
src | source array of pointers to data planes |
dst_offset | offset in samples at which the data will be written to dst |
src_offset | offset in samples at which the data will be read from src |
nb_samples | number of samples to be copied |
nb_channels | number of audio channels |
sample_fmt | audio sample format |
Definition at line 213 of file samplefmt.c.
Referenced by activate(), decode_simple_internal(), ff_inlink_make_frame_writable(), frame_copy_audio(), pad_last_frame(), return_audio_frame(), and take_samples().
int av_samples_set_silence | ( | uint8_t ** | audio_data, |
int | offset, | ||
int | nb_samples, | ||
int | nb_channels, | ||
enum AVSampleFormat | sample_fmt | ||
) |
Fill an audio buffer with silence.
audio_data | array of pointers to data planes |
offset | offset in samples at which to start filling |
nb_samples | number of samples to fill |
nb_channels | number of audio channels |
sample_fmt | audio sample format |
Definition at line 237 of file samplefmt.c.
Referenced by activate(), amrwb_decode_frame(), av_samples_alloc(), ff_audio_data_copy(), ff_audio_mix(), ff_default_get_audio_buffer(), pad_last_frame(), request_frame(), return_audio_frame(), and send_silence().