FFmpeg: libswresample/swresample.c File Reference

FFmpeg

libswresample

Macros | Functions

swresample.c File Reference

#include "libavutil/opt.h"
#include "swresample_internal.h"
#include "audioconvert.h"
#include "libavutil/avassert.h"
#include "libavutil/channel_layout.h"
#include <float.h>

Go to the source code of this file.

Macros

#define ALIGN 32

#define LICENSE_PREFIX "libswresample license: "

#define RSC 1

#define MAX_DROP_STEP 16384

#define MAX_SILENCE_STEP 16384

Functions

unsigned swresample_version (void)

Return the LIBSWRESAMPLE_VERSION_INT constant.

const char * swresample_configuration (void)

Return the swr build-time configuration.

const char * swresample_license (void)

Return the swr license.

int swr_set_channel_mapping (struct SwrContext *s, const int *channel_map)

Set a customized input channel mapping.

struct SwrContext * swr_alloc_set_opts (struct SwrContext *s, int64_t out_ch_layout, enum AVSampleFormat out_sample_fmt, int out_sample_rate, int64_t in_ch_layout, enum AVSampleFormat in_sample_fmt, int in_sample_rate, int log_offset, void *log_ctx)

Allocate SwrContext if needed and set/reset common parameters.

static void set_audiodata_fmt (AudioData *a, enum AVSampleFormat fmt)

static void free_temp (AudioData *a)

static void clear_context (SwrContext *s)

av_cold void swr_free (SwrContext **ss)

Free the given SwrContext and set the pointer to NULL.

av_cold void swr_close (SwrContext *s)

Closes the context so that swr_is_initialized() returns 0.

av_cold int swr_init (struct SwrContext *s)

Initialize context after user parameters have been set.

int swri_realloc_audio (AudioData *a, int count)

static void copy (AudioData *out, AudioData *in, int count)

static void fill_audiodata (AudioData *out, uint8_t *in_arg[SWR_CH_MAX])

static void reversefill_audiodata (AudioData *out, uint8_t *in_arg[SWR_CH_MAX])

static void buf_set (AudioData *out, AudioData *in, int count)

out may be equal in.

static int resample (SwrContext *s, AudioData *out_param, int out_count, const AudioData *in_param, int in_count)

static int swr_convert_internal (struct SwrContext *s, AudioData *out, int out_count, AudioData *in, int in_count)

int swr_is_initialized (struct SwrContext *s)

Check whether an swr context has been initialized or not.

int swr_convert (struct SwrContext *s, uint8_t *out_arg[SWR_CH_MAX], int out_count, const uint8_t *in_arg[SWR_CH_MAX], int in_count)

int swr_drop_output (struct SwrContext *s, int count)

Drops the specified number of output samples.

int swr_inject_silence (struct SwrContext *s, int count)

Injects the specified number of silence samples.

int64_t swr_get_delay (struct SwrContext *s, int64_t base)

Gets the delay the next input sample will experience relative to the next output sample.

int swr_set_compensation (struct SwrContext *s, int sample_delta, int compensation_distance)

Activate resampling compensation ("soft" compensation).

int64_t swr_next_pts (struct SwrContext *s, int64_t pts)

Convert the next timestamp from input to output timestamps are in 1/(in_sample_rate * out_sample_rate) units.

Macro Definition Documentation

#define ALIGN 32

Definition at line 29 of file swresample.c.

Referenced by swri_realloc_audio().

#define LICENSE_PREFIX "libswresample license: "

#define RSC 1

Referenced by swr_init().

#define MAX_DROP_STEP 16384

Referenced by swr_convert().

#define MAX_SILENCE_STEP 16384

Referenced by swr_inject_silence().

Function Documentation

static void set_audiodata_fmt ( AudioData * a,

enum AVSampleFormat fmt

)

static

Definition at line 78 of file swresample.c.

Referenced by swr_init().

static void free_temp ( AudioData * a )

static

Definition at line 84 of file swresample.c.

Referenced by clear_context().

static void clear_context ( SwrContext * s )

static

Definition at line 89 of file swresample.c.

Referenced by swr_close(), swr_free(), and swr_init().

int swri_realloc_audio ( AudioData * a,

int count

)

Definition at line 311 of file swresample.c.

Referenced by invert_initial_buffer(), resample(), resample_flush(), swr_convert(), swr_convert_internal(), and swr_inject_silence().

static void copy ( AudioData * out,

AudioData * in,

int count

)

static

Definition at line 343 of file swresample.c.

Referenced by resample(), swr_convert(), and swr_convert_internal().

static void fill_audiodata ( AudioData * out,

uint8_t * in_arg[SWR_CH_MAX]

)

static

Definition at line 356 of file swresample.c.

Referenced by swr_convert().

static void reversefill_audiodata ( AudioData * out,

uint8_t * in_arg[SWR_CH_MAX]

)

static

Definition at line 369 of file swresample.c.

Referenced by swr_convert(), and swr_inject_silence().

static void buf_set ( AudioData * out,

AudioData * in,

int count

)

static

out may be equal in.

Definition at line 383 of file swresample.c.

Referenced by resample(), and swr_convert().

static int resample ( SwrContext * s,

AudioData * out_param,

int out_count,

const AudioData * in_param,

int in_count

)

static

Returns: number of samples output per channel

Definition at line 398 of file swresample.c.

Referenced by swr_convert_internal().

static int swr_convert_internal ( struct SwrContext * s,

AudioData * out,

int out_count,

AudioData * in,

int in_count

)

static

Definition at line 487 of file swresample.c.

Referenced by swr_convert().

int swr_convert ( struct SwrContext * s,

uint8_t * out_arg[SWR_CH_MAX],

int out_count,

const uint8_t * in_arg[SWR_CH_MAX],

int in_count

)

Examples:: muxing.c, resampling_audio.c, and transcode_aac.c.

Definition at line 618 of file swresample.c.

Referenced by audio_decode_frame(), convert_samples(), filter_frame(), main(), opus_decode_frame(), opus_flush_resample(), opus_init_resample(), request_frame(), swr_drop_output(), swr_inject_silence(), wrap(), and write_audio_frame().

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