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SDL_BuildAudioCVT

Initialize an SDL_AudioCVT structure for conversion.

Syntax

int SDL_BuildAudioCVT(SDL_AudioCVT * cvt,
                      SDL_AudioFormat src_format,
                      Uint8 src_channels,
                      int src_rate,
                      SDL_AudioFormat dst_format,
                      Uint8 dst_channels,
                      int dst_rate);

Function Parameters

cvt

an SDL_AudioCVT structure filled in with audio conversion information

src_format

the source format of the audio data; for more info see SDL_AudioFormat

src_channels

the number of channels in the source

src_rate

the frequency (sample-frames-per-second) of the source

dst_format

the destination format of the audio data; for more info see SDL_AudioFormat

dst_channels

the number of channels in the destination

dst_rate

the frequency (sample-frames-per-second) of the destination

Return Value

Returns 1 if the audio filter is prepared, 0 if no conversion is needed, or a negative error code on failure; call SDL_GetError() for more information.

Remarks

Before an SDL_AudioCVT structure can be used to convert audio data it must be initialized with source and destination information.

This function will zero out every field of the SDL_AudioCVT, so it must be called before the application fills in the final buffer information.

Once this function has returned successfully, and reported that a conversion is necessary, the application fills in the rest of the fields in SDL_AudioCVT, now that it knows how large a buffer it needs to allocate, and then can call SDL_ConvertAudio() to complete the conversion.

Code Examples

// Change 1024 stereo sample frames at 48000Hz from float32 to int16.
SDL_AudioCVT cvt;
SDL_BuildAudioCVT(&cvt, AUDIO_F32, 2, 48000, AUDIO_S16, 2, 48000);
SDL_assert(cvt.needed); // obviously, this one is always needed.
cvt.len = 1024 * 2 * 4;  // 1024 stereo float32 sample frames.
cvt.buf = (Uint8 *) SDL_malloc(cvt.len * cvt.len_mult);
// read your float32 data into cvt.buf here.
SDL_ConvertAudio(&cvt);
// cvt.buf has cvt.len_cvt bytes of converted data now.
SDL_ConvertAudio

CategoryAPI, CategoryAudio


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