swresample

Documentation

Overview

Package swresample provides a high-level interface to the libswresample library audio resampling utilities The process of changing the sampling rate of a discrete signal to obtain a new discrete representation of the underlying continuous signal.

Index

• func SwresampleConfiguration() string
• func SwresampleLicense() string
• func SwresampleVersion() uint
• type AvSampleFormat
• type Class
  • func SwrGetClass() *Class
• type Context
  • func SwrAlloc() *Context
  • func (s *Context) SwrAllocSetOpts(ocl int64, osf AvSampleFormat, osr int, icl int64, isf AvSampleFormat, ...) *Context
  • func (s *Context) SwrClose()
  • func (s *Context) SwrConfigFrame(o, i *Frame) int
  • func (s *Context) SwrConvert(out **uint8, oc int, in **uint8, ic int) int
  • func (s *Context) SwrConvertFrame(o, i *Frame) int
  • func (s *Context) SwrDropOutput(c int) int
  • func (s *Context) SwrFree()
  • func (s *Context) SwrGetDelay(b int64) int64
  • func (s *Context) SwrInit() int
  • func (s *Context) SwrInjectSilence(c int) int
  • func (s *Context) SwrIsInitialized() int
  • func (s *Context) SwrNextPts(pts int64) int64
  • func (s *Context) SwrSetChannelMapping(cm *int) int
  • func (s *Context) SwrSetCompensation(sd, cd int) int
  • func (s *Context) SwrSetMatrix(m *int, t int) int
• type Frame

Functions

func SwresampleConfiguration

func SwresampleConfiguration() string

func SwresampleLicense

func SwresampleLicense() string

func SwresampleVersion

func SwresampleVersion() uint

Configuration accessors

Types

type AvSampleFormat

type AvSampleFormat C.enum_AVSampleFormat

type Class

type Class C.struct_AVClass

func SwrGetClass

func SwrGetClass() *Class

Get the Class for Context.

type Context

type Context C.struct_SwrContext

func SwrAlloc

func SwrAlloc() *Context

Context constructor functions.Allocate Context.

func (*Context) SwrAllocSetOpts

func (s *Context) SwrAllocSetOpts(ocl int64, osf AvSampleFormat, osr int, icl int64, isf AvSampleFormat, isr, lo, lc int) *Context

Allocate Context if needed and set/reset common parameters.

func (*Context) SwrClose

func (s *Context) SwrClose()

Closes the context so that swr_is_initialized() returns 0.

func (*Context) SwrConfigFrame

func (s *Context) SwrConfigFrame(o, i *Frame) int

Configure or reconfigure the Context using the information provided by the AvFrames.

func (*Context) SwrConvert

func (s *Context) SwrConvert(out **uint8, oc int, in **uint8, ic int) int

Core conversion functions. Convert audio

func (*Context) SwrConvertFrame

func (s *Context) SwrConvertFrame(o, i *Frame) int

Frame based API. Convert the samples in the input Frame and write them to the output Frame.

func (*Context) SwrDropOutput

func (s *Context) SwrDropOutput(c int) int

Sample handling functions. Drops the specified number of output samples.

func (*Context) SwrFree

func (s *Context) SwrFree()

Context destructor functions. Free the given Context and set the pointer to NULL.

func (*Context) SwrGetDelay

func (s *Context) SwrGetDelay(b int64) int64

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

func (*Context) SwrInit

func (s *Context) SwrInit() int

Initialize context after user parameters have been set.

func (*Context) SwrInjectSilence

func (s *Context) SwrInjectSilence(c int) int

Injects the specified number of silence samples.

func (*Context) SwrIsInitialized

func (s *Context) SwrIsInitialized() int

Check whether an swr context has been initialized or not.

func (*Context) SwrNextPts

func (s *Context) SwrNextPts(pts int64) int64

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

func (*Context) SwrSetChannelMapping

func (s *Context) SwrSetChannelMapping(cm *int) int

Set a customized input channel mapping.

func (*Context) SwrSetCompensation

func (s *Context) SwrSetCompensation(sd, cd int) int

Low-level option setting functions These functons provide a means to set low-level options that is not possible with the AvOption API. Activate resampling compensation ("soft" compensation).

func (*Context) SwrSetMatrix

func (s *Context) SwrSetMatrix(m *int, t int) int

Set a customized remix matrix.

type Frame

type Frame C.struct_AVFrame