test/testresample.c
changeset 3017 3272431eeee2
child 3018 d706d3170d7d
equal deleted inserted replaced
3016:6be275627762 3017:3272431eeee2
       
     1 #include <stdio.h>
       
     2 #include "SDL.h"
       
     3 
       
     4 int main(int argc, char **argv)
       
     5 {
       
     6     SDL_AudioSpec spec;
       
     7     SDL_AudioCVT cvt;
       
     8     Uint32 len = 0;
       
     9     Uint8 *data = NULL;
       
    10     int cvtfreq = 0;
       
    11     int bitsize = 0;
       
    12     int blockalign = 0;
       
    13     int avgbytes = 0;
       
    14     SDL_RWops *io = NULL;
       
    15 
       
    16     if (argc != 4)
       
    17     {
       
    18         fprintf(stderr, "USAGE: %s in.wav out.wav newfreq\n", argv[0]);
       
    19         return 1;
       
    20     }
       
    21 
       
    22     cvtfreq = atoi(argv[3]);
       
    23 
       
    24     if (SDL_Init(SDL_INIT_AUDIO) == -1)
       
    25     {
       
    26         fprintf(stderr, "SDL_Init() failed: %s\n", SDL_GetError());
       
    27         return 2;
       
    28     }
       
    29 
       
    30     if (SDL_LoadWAV(argv[1], &spec, &data, &len) == NULL)
       
    31     {
       
    32         fprintf(stderr, "failed to load %s: %s\n", argv[1], SDL_GetError());
       
    33         SDL_Quit();
       
    34         return 3;
       
    35     }
       
    36 
       
    37     if (SDL_BuildAudioCVT(&cvt, spec.format, spec.channels, spec.freq,
       
    38                           spec.format, spec.channels, cvtfreq) == -1)
       
    39     {
       
    40         fprintf(stderr, "failed to build CVT: %s\n", SDL_GetError());
       
    41         SDL_FreeWAV(data);
       
    42         SDL_Quit();
       
    43         return 4;
       
    44     }
       
    45 
       
    46     cvt.len = len;
       
    47     cvt.buf = (Uint8 *) malloc(len * cvt.len_mult);
       
    48     if (cvt.buf == NULL)
       
    49     {
       
    50         fprintf(stderr, "Out of memory.\n");
       
    51         SDL_FreeWAV(data);
       
    52         SDL_Quit();
       
    53         return 5;
       
    54     }
       
    55     memcpy(cvt.buf, data, len);
       
    56 
       
    57     if (SDL_ConvertAudio(&cvt) == -1)
       
    58     {
       
    59         fprintf(stderr, "Conversion failed: %s\n", SDL_GetError());
       
    60         free(cvt.buf);
       
    61         SDL_FreeWAV(data);
       
    62         SDL_Quit();
       
    63         return 6;
       
    64     }
       
    65 
       
    66     /* write out a WAV header... */
       
    67     io = SDL_RWFromFile(argv[2], "wb");
       
    68     if (io == NULL)
       
    69     {
       
    70         fprintf(stderr, "fopen('%s') failed: %s\n", argv[2], SDL_GetError());
       
    71         free(cvt.buf);
       
    72         SDL_FreeWAV(data);
       
    73         SDL_Quit();
       
    74         return 7;
       
    75     }
       
    76 
       
    77     bitsize = SDL_AUDIO_BITSIZE(spec.format);
       
    78     blockalign = (bitsize / 8) * spec.channels;
       
    79     avgbytes = cvtfreq * blockalign;
       
    80 
       
    81     SDL_WriteLE32(io, 0x46464952);  /* RIFF */
       
    82     SDL_WriteLE32(io, len * cvt.len_mult + 36);
       
    83     SDL_WriteLE32(io, 0x45564157);  /* WAVE */
       
    84     SDL_WriteLE32(io, 0x20746D66);  /* fmt */
       
    85     SDL_WriteLE32(io, 16);          /* chunk size */
       
    86     SDL_WriteLE16(io, 1);           /* uncompressed */
       
    87     SDL_WriteLE16(io, spec.channels);  /* channels */
       
    88     SDL_WriteLE32(io, cvtfreq);  /* sample rate */
       
    89     SDL_WriteLE32(io, avgbytes);  /* average bytes per second */
       
    90     SDL_WriteLE16(io, blockalign);  /* block align */
       
    91     SDL_WriteLE16(io, bitsize);  /* significant bits per sample */
       
    92     SDL_WriteLE32(io, 0x61746164);  /* data */
       
    93     SDL_WriteLE32(io, len * cvt.len_mult);  /* size */
       
    94     SDL_RWwrite(io, cvt.buf, len * cvt.len_mult, 1);
       
    95 
       
    96     if (SDL_RWclose(io) == -1)
       
    97     {
       
    98         fprintf(stderr, "fclose('%s') failed: %s\n", argv[2], SDL_GetError());
       
    99         free(cvt.buf);
       
   100         SDL_FreeWAV(data);
       
   101         SDL_Quit();
       
   102         return 8;
       
   103     } // if
       
   104 
       
   105     free(cvt.buf);
       
   106     SDL_FreeWAV(data);
       
   107     SDL_Quit();
       
   108     return 0;
       
   109 } // main
       
   110 
       
   111 // end of resample_test.c ...
       
   112