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audio: Improvements in channel conversion code.

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This commit is contained in:
Ryan C. Gordon 2017-01-08 16:18:49 -05:00
parent 35166609d5
commit 38854e0333
2 changed files with 48 additions and 40 deletions
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12
test/testresample.c
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@ -20,6 +20,7 @@ main(int argc, char **argv)
Uint32 len = 0;
Uint8 *data = NULL;
int cvtfreq = 0;
int cvtchans = 0;
int bitsize = 0;
int blockalign = 0;
int avgbytes = 0;
@ -28,12 +29,13 @@ main(int argc, char **argv)
/* Enable standard application logging */
SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
if (argc != 4) {
SDL_Log("USAGE: %s in.wav out.wav newfreq\n", argv[0]);
if (argc != 5) {
SDL_Log("USAGE: %s in.wav out.wav newfreq newchans\n", argv[0]);
return 1;
}
cvtfreq = SDL_atoi(argv[3]);
cvtchans = SDL_atoi(argv[4]);
if (SDL_Init(SDL_INIT_AUDIO) == -1) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "SDL_Init() failed: %s\n", SDL_GetError());
@ -47,7 +49,7 @@ main(int argc, char **argv)
}
if (SDL_BuildAudioCVT(&cvt, spec.format, spec.channels, spec.freq,
spec.format, spec.channels, cvtfreq) == -1) {
spec.format, cvtchans, cvtfreq) == -1) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "failed to build CVT: %s\n", SDL_GetError());
SDL_FreeWAV(data);
SDL_Quit();
@ -83,7 +85,7 @@ main(int argc, char **argv)
}
bitsize = SDL_AUDIO_BITSIZE(spec.format);
blockalign = (bitsize / 8) * spec.channels;
blockalign = (bitsize / 8) * cvtchans;
avgbytes = cvtfreq * blockalign;
SDL_WriteLE32(io, 0x46464952); /* RIFF */
@ -92,7 +94,7 @@ main(int argc, char **argv)
SDL_WriteLE32(io, 0x20746D66); /* fmt */
SDL_WriteLE32(io, 16); /* chunk size */
SDL_WriteLE16(io, 1); /* uncompressed */
SDL_WriteLE16(io, spec.channels); /* channels */
SDL_WriteLE16(io, cvtchans); /* channels */
SDL_WriteLE32(io, cvtfreq); /* sample rate */
SDL_WriteLE32(io, avgbytes); /* average bytes per second */
SDL_WriteLE16(io, blockalign); /* block align */