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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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49
test/testresample.c
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@ -26,8 +26,7 @@ int main(int argc, char **argv)
int blockalign = 0;
int avgbytes = 0;
SDL_RWops *io = NULL;
int src_samplesize, dst_samplesize;
int src_len, dst_len, real_dst_len;
int dst_len;
int ret = 0;
/* Enable standard application logging */
@ -54,54 +53,18 @@ int main(int argc, char **argv)
goto end;
}
stream = SDL_CreateAudioStream(spec.format, spec.channels, spec.freq, spec.format, cvtchans, cvtfreq);
if (stream == NULL) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "failed to build audio stream: %s\n", SDL_GetError());
if (SDL_ConvertAudioSamples(spec.format, spec.channels, spec.freq, len, data,
spec.format, cvtchans, cvtfreq, &dst_len, &dst_buf) < 0) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "failed to convert samples: %s\n", SDL_GetError());
ret = 4;
goto end;
}
src_samplesize = (SDL_AUDIO_BITSIZE(spec.format) / 8) * spec.channels;
dst_samplesize = (SDL_AUDIO_BITSIZE(spec.format) / 8) * cvtchans;
src_len = len & ~(src_samplesize - 1);
dst_len = dst_samplesize * (src_len / src_samplesize);
if (spec.freq < cvtfreq) {
const double mult = ((double)cvtfreq) / ((double)spec.freq);
dst_len *= (int) SDL_ceil(mult);
}
dst_len = dst_len & ~(dst_samplesize - 1);
dst_buf = (Uint8 *)SDL_malloc(dst_len);
if (dst_buf == NULL) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Out of memory.\n");
ret = 5;
goto end;
}
/* Run the audio converter */
if (SDL_PutAudioStreamData(stream, data, src_len) < 0 ||
SDL_FlushAudioStream(stream) < 0) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Conversion failed: %s\n", SDL_GetError());
ret = 6;
goto end;
}
real_dst_len = SDL_GetAudioStreamData(stream, dst_buf, dst_len);
if (real_dst_len < 0) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Conversion failed: %s\n", SDL_GetError());
ret = 7;
goto end;
}
dst_len = real_dst_len;
/* write out a WAV header... */
io = SDL_RWFromFile(argv[2], "wb");
if (io == NULL) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "fopen('%s') failed: %s\n", argv[2], SDL_GetError());
ret = 8;
ret = 5;
goto end;
}
@ -126,7 +89,7 @@ int main(int argc, char **argv)
if (SDL_RWclose(io) == -1) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "fclose('%s') failed: %s\n", argv[2], SDL_GetError());
ret = 9;
ret = 6;
goto end;
}