test/testresample.c
author Ryan C. Gordon <icculus@icculus.org>
Sun, 11 Jan 2009 04:29:36 +0000
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permissions -rw-r--r--
testresample.c: Write out correct size for resampled buffer.
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#include <stdio.h>
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#include "SDL.h"
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int main(int argc, char **argv)
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{
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    SDL_AudioSpec spec;
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    SDL_AudioCVT cvt;
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    Uint32 len = 0;
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    Uint8 *data = NULL;
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    int cvtfreq = 0;
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    int bitsize = 0;
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    int blockalign = 0;
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    int avgbytes = 0;
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    SDL_RWops *io = NULL;
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    if (argc != 4)
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    {
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        fprintf(stderr, "USAGE: %s in.wav out.wav newfreq\n", argv[0]);
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        return 1;
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    }
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    cvtfreq = atoi(argv[3]);
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    if (SDL_Init(SDL_INIT_AUDIO) == -1)
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    {
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        fprintf(stderr, "SDL_Init() failed: %s\n", SDL_GetError());
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        return 2;
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    }
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    if (SDL_LoadWAV(argv[1], &spec, &data, &len) == NULL)
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    {
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        fprintf(stderr, "failed to load %s: %s\n", argv[1], SDL_GetError());
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        SDL_Quit();
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        return 3;
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    }
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    if (SDL_BuildAudioCVT(&cvt, spec.format, spec.channels, spec.freq,
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                          spec.format, spec.channels, cvtfreq) == -1)
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    {
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        fprintf(stderr, "failed to build CVT: %s\n", SDL_GetError());
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        SDL_FreeWAV(data);
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        SDL_Quit();
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        return 4;
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    }
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    cvt.len = len;
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    cvt.buf = (Uint8 *) malloc(len * cvt.len_mult);
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    if (cvt.buf == NULL)
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    {
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        fprintf(stderr, "Out of memory.\n");
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        SDL_FreeWAV(data);
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        SDL_Quit();
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        return 5;
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    }
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    memcpy(cvt.buf, data, len);
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    if (SDL_ConvertAudio(&cvt) == -1)
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    {
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        fprintf(stderr, "Conversion failed: %s\n", SDL_GetError());
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        free(cvt.buf);
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        SDL_FreeWAV(data);
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        SDL_Quit();
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        return 6;
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    }
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    /* write out a WAV header... */
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    io = SDL_RWFromFile(argv[2], "wb");
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    if (io == NULL)
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    {
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        fprintf(stderr, "fopen('%s') failed: %s\n", argv[2], SDL_GetError());
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        free(cvt.buf);
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        SDL_FreeWAV(data);
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        SDL_Quit();
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        return 7;
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    }
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    bitsize = SDL_AUDIO_BITSIZE(spec.format);
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    blockalign = (bitsize / 8) * spec.channels;
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    avgbytes = cvtfreq * blockalign;
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    SDL_WriteLE32(io, 0x46464952);  /* RIFF */
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    SDL_WriteLE32(io, len * cvt.len_mult + 36);
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    SDL_WriteLE32(io, 0x45564157);  /* WAVE */
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    SDL_WriteLE32(io, 0x20746D66);  /* fmt */
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    SDL_WriteLE32(io, 16);          /* chunk size */
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    SDL_WriteLE16(io, 1);           /* uncompressed */
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    SDL_WriteLE16(io, spec.channels);  /* channels */
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    SDL_WriteLE32(io, cvtfreq);  /* sample rate */
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    SDL_WriteLE32(io, avgbytes);  /* average bytes per second */
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    SDL_WriteLE16(io, blockalign);  /* block align */
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    SDL_WriteLE16(io, bitsize);  /* significant bits per sample */
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    SDL_WriteLE32(io, 0x61746164);  /* data */
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    SDL_WriteLE32(io, cvt.len_cvt);  /* size */
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    SDL_RWwrite(io, cvt.buf, cvt.len_cvt, 1);
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    if (SDL_RWclose(io) == -1)
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    {
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        fprintf(stderr, "fclose('%s') failed: %s\n", argv[2], SDL_GetError());
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        free(cvt.buf);
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        SDL_FreeWAV(data);
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        SDL_Quit();
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        return 8;
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    } // if
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    free(cvt.buf);
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    SDL_FreeWAV(data);
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    SDL_Quit();
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    return 0;
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} // main
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// end of resample_test.c ...
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