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 #include "SDL_audio.h"
  32 #include "SDL_stdinc.h"
  33
  34 #include "AL/al.h"
  35
  36 #include "common/alhelpers.h"
  37
  38
  39 /* LoadBuffer loads the named audio file into an OpenAL buffer object, and
  40  * returns the new buffer ID.
  41  */
  42 static ALuint LoadSound(const char *filename)
  43 {
  44     Sound_Sample *sample;
  45     ALenum err, format;
  46     ALuint buffer;
  47     Uint32 slen;
  48
  49     /* Open the audio file */
  50     sample = Sound_NewSampleFromFile(filename, NULL, 65536);
  51     if(!sample)
  52     {
  53         fprintf(stderr, "Could not open audio in %s\n", filename);
  54         return 0;
  55     }
  56
  57     /* Get the sound format, and figure out the OpenAL format */
  58     if(sample->actual.channels == 1)
  59     {
  60         if(sample->actual.format == AUDIO_U8)
  61             format = AL_FORMAT_MONO8;
  62         else if(sample->actual.format == AUDIO_S16SYS)
  63             format = AL_FORMAT_MONO16;
  64         else
  65         {
  66             fprintf(stderr, "Unsupported sample format: 0x%04x\n", sample->actual.format);
  67             Sound_FreeSample(sample);
  68             return 0;
  69         }
  70     }
  71     else if(sample->actual.channels == 2)
  72     {
  73         if(sample->actual.format == AUDIO_U8)
  74             format = AL_FORMAT_STEREO8;
  75         else if(sample->actual.format == AUDIO_S16SYS)
  76             format = AL_FORMAT_STEREO16;
  77         else
  78         {
  79             fprintf(stderr, "Unsupported sample format: 0x%04x\n", sample->actual.format);
  80             Sound_FreeSample(sample);
  81             return 0;
  82         }
  83     }
  84     else
  85     {
  86         fprintf(stderr, "Unsupported channel count: %d\n", sample->actual.channels);
  87         Sound_FreeSample(sample);
  88         return 0;
  89     }
  90
  91     /* Decode the whole audio stream to a buffer. */
  92     slen = Sound_DecodeAll(sample);
  93     if(!sample->buffer || slen == 0)
  94     {
  95         fprintf(stderr, "Failed to read audio from %s\n", filename);
  96         Sound_FreeSample(sample);
  97         return 0;
  98     }
  99
 100     /* Buffer the audio data into a new buffer object, then free the data and
 101      * close the file. */
 102     buffer = 0;
 103     alGenBuffers(1, &buffer);
 104     alBufferData(buffer, format, sample->buffer, (ALsizei)slen, (ALsizei)sample->actual.rate);
 105     Sound_FreeSample(sample);
 106
 107     /* Check if an error occured, and clean up if so. */
 108     err = alGetError();
 109     if(err != AL_NO_ERROR)
 110     {
 111         fprintf(stderr, "OpenAL Error: %s\n", alGetString(err));
 112         if(buffer && alIsBuffer(buffer))
 113             alDeleteBuffers(1, &buffer);
 114         return 0;
 115     }
 116
 117     return buffer;
 118 }
 119
 120
 121 int main(int argc, char **argv)
 122 {
 123     ALuint source, buffer;
 124     ALfloat offset;
 125     ALenum state;
 126
 127     /* Print out usage if no arguments were specified */
 128     if(argc < 2)
 129     {
 130         fprintf(stderr, "Usage: %s [-device <name>] <filename>\n", argv[0]);
 131         return 1;
 132     }
 133
 134     /* Initialize OpenAL. */
 135     argv++; argc--;
 136     if(InitAL(&argv, &argc) != 0)
 137         return 1;
 138
 139     /* Initialize SDL_sound. */
 140     Sound_Init();
 141
 142     /* Load the sound into a buffer. */
 143     buffer = LoadSound(argv[0]);
 144     if(!buffer)
 145     {
 146         Sound_Quit();
 147         CloseAL();
 148         return 1;
 149     }
 150
 151     /* Create the source to play the sound with. */
 152     source = 0;
 153     alGenSources(1, &source);
 154     alSourcei(source, AL_BUFFER, (ALint)buffer);
 155     assert(alGetError()==AL_NO_ERROR && "Failed to setup sound source");
 156
 157     /* Play the sound until it finishes. */
 158     alSourcePlay(source);
 159     do {
 160         al_nssleep(10000000);
 161         alGetSourcei(source, AL_SOURCE_STATE, &state);
 162
 163         /* Get the source offset. */
 164         alGetSourcef(source, AL_SEC_OFFSET, &offset);
 165         printf("\rOffset: %f  ", offset);
 166         fflush(stdout);
 167     } while(alGetError() == AL_NO_ERROR && state == AL_PLAYING);
 168     printf("\n");
 169
 170     /* All done. Delete resources, and close down SDL_sound and OpenAL. */
 171     alDeleteSources(1, &source);
 172     alDeleteBuffers(1, &buffer);
 173
 174     Sound_Quit();
 175     CloseAL();
 176
 177     return 0;
 178 }