testresample.c (3818B)
1 /* 2 Copyright (C) 1997-2020 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, SDL_AUDIO_ISFLOAT(spec.format) ? 3 : 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 ... */