examples/alplay.c

   1 /*
   2  * OpenAL Source Play Example
   3  *
   4  * Copyright (c) 2017 by Chris Robinson <chris.kcat@gmail.com>
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  19  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 /* This file contains an example for playing a sound buffer. */
  26
  27 #include <stdio.h>
  28 #include <assert.h>
  29
  30 #include <SDL_sound.h>
  31
  32 #include "AL/al.h"
  33 #include "AL/alc.h"
  34
  35 #include "common/alhelpers.h"
  36
  37
  38 /* LoadBuffer loads the named audio file into an OpenAL buffer object, and
  39  * returns the new buffer ID.
  40  */
  41 static ALuint LoadSound(const char *filename)
  42 {
  43     Sound_Sample *sample;
  44     ALenum err, format;
  45     ALuint buffer;
  46     Uint32 slen;
  47
  48     /* Open the audio file */
  49     sample = Sound_NewSampleFromFile(filename, NULL, 65536);
  50     if(!sample)
  51     {
  52         fprintf(stderr, "Could not open audio in %s\n", filename);
  53         return 0;
  54     }
  55
  56     /* Get the sound format, and figure out the OpenAL format */
  57     if(sample->actual.channels == 1)
  58     {
  59         if(sample->actual.format == AUDIO_U8)
  60             format = AL_FORMAT_MONO8;
  61         else if(sample->actual.format == AUDIO_S16SYS)
  62             format = AL_FORMAT_MONO16;
  63         else
  64         {
  65             fprintf(stderr, "Unsupported sample format: 0x%04x\n", sample->actual.format);
  66             Sound_FreeSample(sample);
  67             return 0;
  68         }
  69     }
  70     else if(sample->actual.channels == 2)
  71     {
  72         if(sample->actual.format == AUDIO_U8)
  73             format = AL_FORMAT_STEREO8;
  74         else if(sample->actual.format == AUDIO_S16SYS)
  75             format = AL_FORMAT_STEREO16;
  76         else
  77         {
  78             fprintf(stderr, "Unsupported sample format: 0x%04x\n", sample->actual.format);
  79             Sound_FreeSample(sample);
  80             return 0;
  81         }
  82     }
  83     else
  84     {
  85         fprintf(stderr, "Unsupported channel count: %d\n", sample->actual.channels);
  86         Sound_FreeSample(sample);
  87         return 0;
  88     }
  89
  90     /* Decode the whole audio stream to a buffer. */
  91     slen = Sound_DecodeAll(sample);
  92     if(!sample->buffer || slen == 0)
  93     {
  94         fprintf(stderr, "Failed to read audio from %s\n", filename);
  95         Sound_FreeSample(sample);
  96         return 0;
  97     }
  98
  99     /* Buffer the audio data into a new buffer object, then free the data and
 100      * close the file. */
 101     buffer = 0;
 102     alGenBuffers(1, &buffer);
 103     alBufferData(buffer, format, sample->buffer, slen, sample->actual.rate);
 104     Sound_FreeSample(sample);
 105
 106     /* Check if an error occured, and clean up if so. */
 107     err = alGetError();
 108     if(err != AL_NO_ERROR)
 109     {
 110         fprintf(stderr, "OpenAL Error: %s\n", alGetString(err));
 111         if(buffer && alIsBuffer(buffer))
 112             alDeleteBuffers(1, &buffer);
 113         return 0;
 114     }
 115
 116     return buffer;
 117 }
 118
 119
 120 int main(int argc, char **argv)
 121 {
 122     ALuint source, buffer;
 123     ALfloat offset;
 124     ALenum state;
 125
 126     /* Print out usage if no arguments were specified */
 127     if(argc < 2)
 128     {
 129         fprintf(stderr, "Usage: %s [-device <name>] <filename>\n", argv[0]);
 130         return 1;
 131     }
 132
 133     /* Initialize OpenAL. */
 134     argv++; argc--;
 135     if(InitAL(&argv, &argc) != 0)
 136         return 1;
 137
 138     /* Initialize SDL_sound. */
 139     Sound_Init();
 140
 141     /* Load the sound into a buffer. */
 142     buffer = LoadSound(argv[0]);
 143     if(!buffer)
 144     {
 145         Sound_Quit();
 146         CloseAL();
 147         return 1;
 148     }
 149
 150     /* Create the source to play the sound with. */
 151     source = 0;
 152     alGenSources(1, &source);
 153     alSourcei(source, AL_BUFFER, buffer);
 154     assert(alGetError()==AL_NO_ERROR && "Failed to setup sound source");
 155
 156     /* Play the sound until it finishes. */
 157     alSourcePlay(source);
 158     do {
 159         al_nssleep(10000000);
 160         alGetSourcei(source, AL_SOURCE_STATE, &state);
 161
 162         /* Get the source offset. */
 163         alGetSourcef(source, AL_SEC_OFFSET, &offset);
 164         printf("\rOffset: %f  ", offset);
 165         fflush(stdout);
 166     } while(alGetError() == AL_NO_ERROR && state == AL_PLAYING);
 167     printf("\n");
 168
 169     /* All done. Delete resources, and close down SDL_sound and OpenAL. */
 170     alDeleteSources(1, &source);
 171     alDeleteBuffers(1, &buffer);
 172
 173     Sound_Quit();
 174     CloseAL();
 175
 176     return 0;
 177 }