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 <assert.h>
  28 #include <inttypes.h>
  29 #include <limits.h>
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32
  33 #include "sndfile.h"
  34
  35 #include "AL/al.h"
  36 #include "AL/alext.h"
  37
  38 #include "common/alhelpers.h"
  39
  40
  41 /* LoadBuffer loads the named audio file into an OpenAL buffer object, and
  42  * returns the new buffer ID.
  43  */
  44 static ALuint LoadSound(const char *filename)
  45 {
  46     ALenum err, format;
  47     ALuint buffer;
  48     SNDFILE *sndfile;
  49     SF_INFO sfinfo;
  50     short *membuf;
  51     sf_count_t num_frames;
  52     ALsizei num_bytes;
  53
  54     /* Open the audio file and check that it's usable. */
  55     sndfile = sf_open(filename, SFM_READ, &sfinfo);
  56     if(!sndfile)
  57     {
  58         fprintf(stderr, "Could not open audio in %s: %s\n", filename, sf_strerror(sndfile));
  59         return 0;
  60     }
  61     if(sfinfo.frames < 1 || sfinfo.frames > (sf_count_t)(INT_MAX/sizeof(short))/sfinfo.channels)
  62     {
  63         fprintf(stderr, "Bad sample count in %s (%" PRId64 ")\n", filename, sfinfo.frames);
  64         sf_close(sndfile);
  65         return 0;
  66     }
  67
  68     /* Get the sound format, and figure out the OpenAL format */
  69     format = AL_NONE;
  70     if(sfinfo.channels == 1)
  71         format = AL_FORMAT_MONO16;
  72     else if(sfinfo.channels == 2)
  73         format = AL_FORMAT_STEREO16;
  74     else if(sfinfo.channels == 3)
  75     {
  76         if(sf_command(sndfile, SFC_WAVEX_GET_AMBISONIC, NULL, 0) == SF_AMBISONIC_B_FORMAT)
  77             format = AL_FORMAT_BFORMAT2D_16;
  78     }
  79     else if(sfinfo.channels == 4)
  80     {
  81         if(sf_command(sndfile, SFC_WAVEX_GET_AMBISONIC, NULL, 0) == SF_AMBISONIC_B_FORMAT)
  82             format = AL_FORMAT_BFORMAT3D_16;
  83     }
  84     if(!format)
  85     {
  86         fprintf(stderr, "Unsupported channel count: %d\n", sfinfo.channels);
  87         sf_close(sndfile);
  88         return 0;
  89     }
  90
  91     /* Decode the whole audio file to a buffer. */
  92     membuf = malloc((size_t)(sfinfo.frames * sfinfo.channels) * sizeof(short));
  93
  94     num_frames = sf_readf_short(sndfile, membuf, sfinfo.frames);
  95     if(num_frames < 1)
  96     {
  97         free(membuf);
  98         sf_close(sndfile);
  99         fprintf(stderr, "Failed to read samples in %s (%" PRId64 ")\n", filename, num_frames);
 100         return 0;
 101     }
 102     num_bytes = (ALsizei)(num_frames * sfinfo.channels) * (ALsizei)sizeof(short);
 103
 104     /* Buffer the audio data into a new buffer object, then free the data and
 105      * close the file.
 106      */
 107     buffer = 0;
 108     alGenBuffers(1, &buffer);
 109     alBufferData(buffer, format, membuf, num_bytes, sfinfo.samplerate);
 110
 111     free(membuf);
 112     sf_close(sndfile);
 113
 114     /* Check if an error occured, and clean up if so. */
 115     err = alGetError();
 116     if(err != AL_NO_ERROR)
 117     {
 118         fprintf(stderr, "OpenAL Error: %s\n", alGetString(err));
 119         if(buffer && alIsBuffer(buffer))
 120             alDeleteBuffers(1, &buffer);
 121         return 0;
 122     }
 123
 124     return buffer;
 125 }
 126
 127
 128 int main(int argc, char **argv)
 129 {
 130     ALuint source, buffer;
 131     ALfloat offset;
 132     ALenum state;
 133
 134     /* Print out usage if no arguments were specified */
 135     if(argc < 2)
 136     {
 137         fprintf(stderr, "Usage: %s [-device <name>] <filename>\n", argv[0]);
 138         return 1;
 139     }
 140
 141     /* Initialize OpenAL. */
 142     argv++; argc--;
 143     if(InitAL(&argv, &argc) != 0)
 144         return 1;
 145
 146     /* Load the sound into a buffer. */
 147     buffer = LoadSound(argv[0]);
 148     if(!buffer)
 149     {
 150         CloseAL();
 151         return 1;
 152     }
 153
 154     /* Create the source to play the sound with. */
 155     source = 0;
 156     alGenSources(1, &source);
 157     alSourcei(source, AL_BUFFER, (ALint)buffer);
 158     assert(alGetError()==AL_NO_ERROR && "Failed to setup sound source");
 159
 160     /* Play the sound until it finishes. */
 161     alSourcePlay(source);
 162     do {
 163         al_nssleep(10000000);
 164         alGetSourcei(source, AL_SOURCE_STATE, &state);
 165
 166         /* Get the source offset. */
 167         alGetSourcef(source, AL_SEC_OFFSET, &offset);
 168         printf("\rOffset: %f  ", offset);
 169         fflush(stdout);
 170     } while(alGetError() == AL_NO_ERROR && state == AL_PLAYING);
 171     printf("\n");
 172
 173     /* All done. Delete resources, and close down OpenAL. */
 174     alDeleteSources(1, &source);
 175     alDeleteBuffers(1, &buffer);
 176
 177     CloseAL();
 178
 179     return 0;
 180 }