test/testresample.c
author Sam Lantinga <slouken@libsdl.org>
Thu, 07 Dec 2017 16:08:09 -0800
changeset 11730 ac6c607e065c
parent 10803 fda48e7c29e8
child 11811 5d94cb6b24d3
permissions -rw-r--r--
Enable building the Metal renderer by default, and weak link the Metal framework so the SDL library is safe to use on older Macs
Also generate iOS versions of the Metal shaders
     1 /*
     2   Copyright (C) 1997-2017 Sam Lantinga <slouken@libsdl.org>
     3 
     4   This software is provided 'as-is', without any express or implied
     5   warranty.  In no event will the authors be held liable for any damages
     6   arising from the use of this software.
     7 
     8   Permission is granted to anyone to use this software for any purpose,
     9   including commercial applications, and to alter it and redistribute it
    10   freely.
    11 */
    12 
    13 #include "SDL.h"
    14 
    15 int
    16 main(int argc, char **argv)
    17 {
    18     SDL_AudioSpec spec;
    19     SDL_AudioCVT cvt;
    20     Uint32 len = 0;
    21     Uint8 *data = NULL;
    22     int cvtfreq = 0;
    23     int cvtchans = 0;
    24     int bitsize = 0;
    25     int blockalign = 0;
    26     int avgbytes = 0;
    27     SDL_RWops *io = NULL;
    28 
    29     /* Enable standard application logging */
    30     SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
    31 
    32     if (argc != 5) {
    33         SDL_Log("USAGE: %s in.wav out.wav newfreq newchans\n", argv[0]);
    34         return 1;
    35     }
    36 
    37     cvtfreq = SDL_atoi(argv[3]);
    38     cvtchans = SDL_atoi(argv[4]);
    39 
    40     if (SDL_Init(SDL_INIT_AUDIO) == -1) {
    41         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "SDL_Init() failed: %s\n", SDL_GetError());
    42         return 2;
    43     }
    44 
    45     if (SDL_LoadWAV(argv[1], &spec, &data, &len) == NULL) {
    46         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "failed to load %s: %s\n", argv[1], SDL_GetError());
    47         SDL_Quit();
    48         return 3;
    49     }
    50 
    51     if (SDL_BuildAudioCVT(&cvt, spec.format, spec.channels, spec.freq,
    52                           spec.format, cvtchans, cvtfreq) == -1) {
    53         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "failed to build CVT: %s\n", SDL_GetError());
    54         SDL_FreeWAV(data);
    55         SDL_Quit();
    56         return 4;
    57     }
    58 
    59     cvt.len = len;
    60     cvt.buf = (Uint8 *) SDL_malloc(len * cvt.len_mult);
    61     if (cvt.buf == NULL) {
    62         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Out of memory.\n");
    63         SDL_FreeWAV(data);
    64         SDL_Quit();
    65         return 5;
    66     }
    67     SDL_memcpy(cvt.buf, data, len);
    68 
    69     if (SDL_ConvertAudio(&cvt) == -1) {
    70         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Conversion failed: %s\n", SDL_GetError());
    71         SDL_free(cvt.buf);
    72         SDL_FreeWAV(data);
    73         SDL_Quit();
    74         return 6;
    75     }
    76 
    77     /* write out a WAV header... */
    78     io = SDL_RWFromFile(argv[2], "wb");
    79     if (io == NULL) {
    80         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "fopen('%s') failed: %s\n", argv[2], SDL_GetError());
    81         SDL_free(cvt.buf);
    82         SDL_FreeWAV(data);
    83         SDL_Quit();
    84         return 7;
    85     }
    86 
    87     bitsize = SDL_AUDIO_BITSIZE(spec.format);
    88     blockalign = (bitsize / 8) * cvtchans;
    89     avgbytes = cvtfreq * blockalign;
    90 
    91     SDL_WriteLE32(io, 0x46464952);      /* RIFF */
    92     SDL_WriteLE32(io, cvt.len_cvt + 36);
    93     SDL_WriteLE32(io, 0x45564157);      /* WAVE */
    94     SDL_WriteLE32(io, 0x20746D66);      /* fmt */
    95     SDL_WriteLE32(io, 16);      /* chunk size */
    96     SDL_WriteLE16(io, 1);       /* uncompressed */
    97     SDL_WriteLE16(io, cvtchans);   /* channels */
    98     SDL_WriteLE32(io, cvtfreq); /* sample rate */
    99     SDL_WriteLE32(io, avgbytes);        /* average bytes per second */
   100     SDL_WriteLE16(io, blockalign);      /* block align */
   101     SDL_WriteLE16(io, bitsize); /* significant bits per sample */
   102     SDL_WriteLE32(io, 0x61746164);      /* data */
   103     SDL_WriteLE32(io, cvt.len_cvt);     /* size */
   104     SDL_RWwrite(io, cvt.buf, cvt.len_cvt, 1);
   105 
   106     if (SDL_RWclose(io) == -1) {
   107         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "fclose('%s') failed: %s\n", argv[2], SDL_GetError());
   108         SDL_free(cvt.buf);
   109         SDL_FreeWAV(data);
   110         SDL_Quit();
   111         return 8;
   112     }                           /* if */
   113 
   114     SDL_free(cvt.buf);
   115     SDL_FreeWAV(data);
   116     SDL_Quit();
   117     return 0;
   118 }                               /* main */
   119 
   120 /* end of testresample.c ... */