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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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70
src/audio/SDL_audio.c
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@@ -1662,3 +1662,73 @@ void SDL_CalculateAudioSpec(SDL_AudioSpec *spec)
spec->size *= spec->samples;
}
int SDL_ConvertAudioSamples(
SDL_AudioFormat src_format, Uint8 src_channels, int src_rate, int src_len, Uint8 *src_data,
SDL_AudioFormat dst_format, Uint8 dst_channels, int dst_rate, int *dst_len, Uint8 **dst_data)
{
int ret = -1;
SDL_AudioStream *stream = NULL;
int src_samplesize, dst_samplesize;
int real_dst_len;
if (src_len < 0) {
return SDL_InvalidParamError("src_len");
}
if (src_data == NULL) {
return SDL_InvalidParamError("src_data");
}
if (dst_len == NULL) {
return SDL_InvalidParamError("dst_len");
}
if (dst_data == NULL) {
return SDL_InvalidParamError("dst_data");
}
*dst_len = 0;
*dst_data = NULL;
stream = SDL_CreateAudioStream(src_format, src_channels, src_rate, dst_format, dst_channels, dst_rate);
if (stream == NULL) {
goto end;
}
src_samplesize = (SDL_AUDIO_BITSIZE(src_format) / 8) * src_channels;
dst_samplesize = (SDL_AUDIO_BITSIZE(dst_format) / 8) * dst_channels;
src_len &= ~(src_samplesize - 1);
*dst_len = dst_samplesize * (src_len / src_samplesize);
if (src_rate < dst_rate) {
const double mult = ((double)dst_rate) / ((double)src_rate);
*dst_len *= (int) SDL_ceil(mult);
}
*dst_len &= ~(dst_samplesize - 1);
*dst_data = (Uint8 *)SDL_malloc(*dst_len);
if (*dst_data == NULL) {
goto end;
}
if (SDL_PutAudioStreamData(stream, src_data, src_len) < 0 ||
SDL_FlushAudioStream(stream) < 0) {
goto end;
}
real_dst_len = SDL_GetAudioStreamData(stream, *dst_data, *dst_len);
if (real_dst_len < 0) {
goto end;
}
*dst_len = real_dst_len;
ret = 0;
end:
if (ret != 0) {
SDL_free(*dst_data);
*dst_len = 0;
*dst_data = NULL;
}
SDL_DestroyAudioStream(stream);
return ret;
}