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Created By grepwood at 2014/10/11 23:28

1.   #include <stdio.h>
2.   #include <stdint.h>
3.   #include <string.h>
4.   #include <SDL2/SDL.h>
5.   #include <acm/libacm.h>
6.  
7.   /* Written circa 2014 by grepwood@sucs.org */
8.  
9.   /* This program will utilize libacm and some string logic
10.   * in order to absolutely correctly decode an ACM at all times,
11.   * without user hints. */
12.  
13.   /* prototype for our audio callback
14.   * see the implementation for more information */
15.  
16.   /* variable declarations */
17.   static uint8_t *audio_pos; /* global pointer to the audio buffer to be played */
18.   static uint32_t audio_len; /* remaining length of the sample we have to play */
19.  
20.   /* audio callback function
21.   * here you have to copy the data of your audio buffer into the
22.   * requesting audio buffer (stream)
23.   * you should only copy as much as the requested length (len) */
24.  
25.   void my_audio_callback(void * userdata, Uint8 *stream, int len) {
26.       if (audio_len ==0)
27.           return;
28.       len = ( (unsigned)len > audio_len ? audio_len : (unsigned)len );
29.       SDL_MixAudio(stream, audio_pos, len, SDL_MIX_MAXVOLUME); /* mix from one buffer into another */
30.  
31.       audio_pos += len;
32.       audio_len -= len;
33.   }
34.  
35.   /* Some sounds in Fallout have spoofed channel amount.
36.   * Known suspects are from the Speech directory.
37.   * Hence the strstr call */
38.   uint8_t DetectFakeStereo(const char *fn) {
39.       uint8_t result = 0;
40.       char * pointer;
41.       pointer = strstr(fn,"Speech");
42.       if(pointer != NULL) {
43.           result = 1;
44.       }
45.       return result;
46.   }
47.  
48.   int main(int argc, char* argv[]){
49.       static uint32_t wav_length;
50.       static uint8_t *wav_buffer;
51.       static SDL_AudioSpec wav_spec;
52.       uint32_t wavsize;
53.       char * fn2 = NULL;
54.       uint8_t cf_force_chans;
55.       SDL_RWops * WavFromACM = NULL;
56.       if ( argc != 2 ) {
57.           fputs("Need a path to ACM file\n",stderr);
58.           return 2;
59.       }
60.       if (SDL_Init(SDL_INIT_AUDIO) < 0) {
61.           fputs("Could not SDL_Init\n",stderr);
62.           return 1;
63.       }
64.   /* Detect spoofed stereo by known strings */
65.       cf_force_chans = DetectFakeStereo(argv[1]);
66.   /* FSF.ACM is unfortunately spoofed too */
67.       cf_force_chans = 1;
68.   /* Convert the ACM to WAV */
69.       fn2 = libacm_decode_file_to_mem(argv[1],cf_force_chans,&wavsize);
70.   /* Load the WAV the specs, length and buffer of our wav are filled */
71.       WavFromACM = SDL_RWFromConstMem(fn2,wavsize);
72.       if(SDL_LoadWAV_RW(WavFromACM,1,&wav_spec,&wav_buffer, &wav_length) == NULL) {
73.           free(fn2);
74.           fputs("Loading the ACM didn't succeed\n",stderr);
75.           return 2;
76.       }
77.   /* set the callback function */
78.       wav_spec.callback = my_audio_callback;
79.       wav_spec.userdata = NULL;
80.   /* set our global static variables */
81.       audio_pos = wav_buffer; /* copy sound buffer */
82.       audio_len = wav_length; /* copy file length */
83.   /* Open the audio device */
84.       if ( SDL_OpenAudio(&wav_spec, NULL) < 0 ){
85.           fprintf(stderr, "Couldn't open audio: %s\n", SDL_GetError());
86.           free(fn2);
87.           exit(-1);
88.       }
89.   /* Start playing */
90.       SDL_PauseAudio(0);
91.   /* wait until we're don't playing */
92.       while ( audio_len > 0 ) {
93.           SDL_Delay(100);
94.       }
95.   /* shut everything down */
96.       SDL_CloseAudio();
97.       SDL_FreeWAV(wav_buffer);
98.       free(fn2);
99.       return 0;
100.   }