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Add SDL_ConvertAudioSamples() helper function

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Sylvain
2023-01-23 08:24:49 +01:00
committed by Sam Lantinga
parent 7b50bae524
commit 052b14eb65
8 changed files with 124 additions and 57 deletions
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27
docs/README-migration.md
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@@ -54,29 +54,28 @@ SDL_PauseAudioDevice() is only used to pause audio playback. Use SDL_PlayAudioDe
SDL_FreeWAV has been removed and calls can be replaced with SDL_free.
SDL_AudioCVT interface is removed, SDL_AudioStream can be used instead.
SDL_AudioCVT interface is removed, SDL_AudioStream interface or SDL_ConvertAudioSamples() helper function can be used.
Code that used to look like this:
```c
SDL_AudioCVT cvt;
SDL_BuildAudioCVT(&cvt, spec.format, spec.channels, spec.freq, spec.format, cvtchans, cvtfreq);
cvt.len = len;
cvt.buf = (Uint8 *) SDL_malloc(len * cvt.len_mult);
SDL_memcpy(cvt.buf, data, len);
SDL_BuildAudioCVT(&cvt, src_format, src_channels, src_rate, dst_format, dst_channels, dst_rate);
cvt.len = src_len;
cvt.buf = (Uint8 *) SDL_malloc(src_len * cvt.len_mult);
SDL_memcpy(cvt.buf, src_data, src_len);
SDL_ConvertAudio(&cvt);
do_something(cvt.buf, cvt.len_cvt);
```
should be changed to:
```c
SDL_AudioStream *stream = SDL_CreateAudioStream(spec.format, spec.channels, spec.freq, spec.format, cvtchans, cvtfreq);
int src_samplesize = (SDL_AUDIO_BITSIZE(spec.format) / 8) * spec.channels;
int src_len = len & ~(src_samplesize - 1); // need to be rounded to samplesize
SDL_PutAudioStreamData(stream, data, src_len);
SDL_FlushAudioStream(stream);
int dst_len = expected_dst_len & ~(dst_samplesize - 1); // need to be rounded to samplesize
Uint8 *dst_buf = (Uint8 *)SDL_malloc(dst_len);
int real_dst_len = SDL_GetAudioStreamData(stream, dst_buf, dst_len);
do_something(dst_buf, real_dst_len);
Uint8 *dst_data = NULL;
int dst_len = 0;
if (SDL_ConvertAudioSamples(src_format, src_channels, src_rate, src_len, src_data
dst_format, dst_channels, dst_rate, &dst_len, &dst_data) < 0) {
/* error */
}
do_something(dst_data, dst_len);
SDL_free(dst_data);
```