examples/allatency.c

   1 /*
   2  * OpenAL Source Latency Example
   3  *
   4  * Copyright (c) 2012 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 checking the latency of a sound. */
  26
  27 #include <stdio.h>
  28 #include <assert.h>
  29
  30 #include "AL/al.h"
  31 #include "AL/alc.h"
  32 #include "AL/alext.h"
  33
  34 #include "common/alhelpers.h"
  35 #include "common/sdl_sound.h"
  36
  37
  38 static LPALBUFFERSAMPLESSOFT alBufferSamplesSOFT = wrap_BufferSamples;
  39 static LPALISBUFFERFORMATSUPPORTEDSOFT alIsBufferFormatSupportedSOFT;
  40
  41 static LPALSOURCEDSOFT alSourcedSOFT;
  42 static LPALSOURCE3DSOFT alSource3dSOFT;
  43 static LPALSOURCEDVSOFT alSourcedvSOFT;
  44 static LPALGETSOURCEDSOFT alGetSourcedSOFT;
  45 static LPALGETSOURCE3DSOFT alGetSource3dSOFT;
  46 static LPALGETSOURCEDVSOFT alGetSourcedvSOFT;
  47 static LPALSOURCEI64SOFT alSourcei64SOFT;
  48 static LPALSOURCE3I64SOFT alSource3i64SOFT;
  49 static LPALSOURCEI64VSOFT alSourcei64vSOFT;
  50 static LPALGETSOURCEI64SOFT alGetSourcei64SOFT;
  51 static LPALGETSOURCE3I64SOFT alGetSource3i64SOFT;
  52 static LPALGETSOURCEI64VSOFT alGetSourcei64vSOFT;
  53
  54 /* LoadBuffer loads the named audio file into an OpenAL buffer object, and
  55  * returns the new buffer ID. */
  56 static ALuint LoadSound(const char *filename)
  57 {
  58     ALenum err, format, type, channels;
  59     ALuint rate, buffer;
  60     size_t datalen;
  61     void *data;
  62     FilePtr sound;
  63
  64     /* Open the audio file */
  65     sound = openAudioFile(filename, 1000);
  66     if(!sound)
  67     {
  68         fprintf(stderr, "Could not open audio in %s\n", filename);
  69         closeAudioFile(sound);
  70         return 0;
  71     }
  72
  73     /* Get the sound format, and figure out the OpenAL format */
  74     if(getAudioInfo(sound, &rate, &channels, &type) != 0)
  75     {
  76         fprintf(stderr, "Error getting audio info for %s\n", filename);
  77         closeAudioFile(sound);
  78         return 0;
  79     }
  80
  81     format = GetFormat(channels, type, alIsBufferFormatSupportedSOFT);
  82     if(format == AL_NONE)
  83     {
  84         fprintf(stderr, "Unsupported format (%s, %s) for %s\n",
  85                 ChannelsName(channels), TypeName(type), filename);
  86         closeAudioFile(sound);
  87         return 0;
  88     }
  89
  90     /* Decode the whole audio stream to a buffer. */
  91     data = decodeAudioStream(sound, &datalen);
  92     if(!data)
  93     {
  94         fprintf(stderr, "Failed to read audio from %s\n", filename);
  95         closeAudioFile(sound);
  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     alBufferSamplesSOFT(buffer, rate, format, BytesToFrames(datalen, channels, type),
 104                         channels, type, data);
 105     free(data);
 106     closeAudioFile(sound);
 107
 108     /* Check if an error occured, and clean up if so. */
 109     err = alGetError();
 110     if(err != AL_NO_ERROR)
 111     {
 112         fprintf(stderr, "OpenAL Error: %s\n", alGetString(err));
 113         if(alIsBuffer(buffer))
 114             alDeleteBuffers(1, &buffer);
 115         return 0;
 116     }
 117
 118     return buffer;
 119 }
 120
 121
 122 int main(int argc, char **argv)
 123 {
 124     ALuint source, buffer;
 125     ALdouble offsets[2];
 126     ALenum state;
 127
 128     /* Print out usage if no file was specified */
 129     if(argc < 2)
 130     {
 131         fprintf(stderr, "Usage: %s <filename>\n", argv[0]);
 132         return 1;
 133     }
 134
 135     /* Initialize OpenAL with the default device, and check for EFX support. */
 136     if(InitAL() != 0)
 137         return 1;
 138
 139     if(!alIsExtensionPresent("AL_SOFT_source_latency"))
 140     {
 141         fprintf(stderr, "Error: AL_SOFT_source_latency not supported\n");
 142         CloseAL();
 143         return 1;
 144     }
 145
 146     /* Define a macro to help load the function pointers. */
 147 #define LOAD_PROC(x)  ((x) = alGetProcAddress(#x))
 148     LOAD_PROC(alSourcedSOFT);
 149     LOAD_PROC(alSource3dSOFT);
 150     LOAD_PROC(alSourcedvSOFT);
 151     LOAD_PROC(alGetSourcedSOFT);
 152     LOAD_PROC(alGetSource3dSOFT);
 153     LOAD_PROC(alGetSourcedvSOFT);
 154     LOAD_PROC(alSourcei64SOFT);
 155     LOAD_PROC(alSource3i64SOFT);
 156     LOAD_PROC(alSourcei64vSOFT);
 157     LOAD_PROC(alGetSourcei64SOFT);
 158     LOAD_PROC(alGetSource3i64SOFT);
 159     LOAD_PROC(alGetSourcei64vSOFT);
 160
 161     if(alIsExtensionPresent("AL_SOFT_buffer_samples"))
 162     {
 163         LOAD_PROC(alBufferSamplesSOFT);
 164         LOAD_PROC(alIsBufferFormatSupportedSOFT);
 165     }
 166 #undef LOAD_PROC
 167
 168     /* Load the sound into a buffer. */
 169     buffer = LoadSound(argv[1]);
 170     if(!buffer)
 171     {
 172         CloseAL();
 173         return 1;
 174     }
 175
 176     /* Create the source to play the sound with. */
 177     source = 0;
 178     alGenSources(1, &source);
 179     alSourcei(source, AL_BUFFER, buffer);
 180     assert(alGetError()==AL_NO_ERROR && "Failed to setup sound source");
 181
 182     /* Play the sound until it finishes. */
 183     alSourcePlay(source);
 184     do {
 185         al_nssleep(10000000);
 186         alGetSourcei(source, AL_SOURCE_STATE, &state);
 187
 188         /* Get the source offset and latency. AL_SEC_OFFSET_LATENCY_SOFT will
 189          * place the offset (in seconds) in offsets[0], and the time until that
 190          * offset will be heard (in seconds) in offsets[1]. */
 191         alGetSourcedvSOFT(source, AL_SEC_OFFSET_LATENCY_SOFT, offsets);
 192         printf("\rOffset: %f - Latency:%3u ms  ", offsets[0], (ALuint)(offsets[1]*1000));
 193         fflush(stdout);
 194     } while(alGetError() == AL_NO_ERROR && state == AL_PLAYING);
 195     printf("\n");
 196
 197     /* All done. Delete resources, and close OpenAL. */
 198     alDeleteSources(1, &source);
 199     alDeleteBuffers(1, &buffer);
 200
 201     CloseAL();
 202
 203     return 0;
 204 }