/* * OpenAL Source Latency Example * * Copyright (c) 2012 by Chris Robinson <chris.kcat@gmail.com> * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ /* This file contains an example for checking the latency of a sound. */ #include <stdio.h> #include <assert.h> #include "AL/al.h" #include "AL/alc.h" #include "AL/alext.h" #include "common/alhelpers.h" #include "common/sdl_sound.h" static LPALBUFFERSAMPLESSOFT alBufferSamplesSOFT = wrap_BufferSamples; static LPALISBUFFERFORMATSUPPORTEDSOFT alIsBufferFormatSupportedSOFT; static LPALSOURCEDSOFT alSourcedSOFT; static LPALSOURCE3DSOFT alSource3dSOFT; static LPALSOURCEDVSOFT alSourcedvSOFT; static LPALGETSOURCEDSOFT alGetSourcedSOFT; static LPALGETSOURCE3DSOFT alGetSource3dSOFT; static LPALGETSOURCEDVSOFT alGetSourcedvSOFT; static LPALSOURCEI64SOFT alSourcei64SOFT; static LPALSOURCE3I64SOFT alSource3i64SOFT; static LPALSOURCEI64VSOFT alSourcei64vSOFT; static LPALGETSOURCEI64SOFT alGetSourcei64SOFT; static LPALGETSOURCE3I64SOFT alGetSource3i64SOFT; static LPALGETSOURCEI64VSOFT alGetSourcei64vSOFT; /* LoadBuffer loads the named audio file into an OpenAL buffer object, and * returns the new buffer ID. */ static ALuint LoadSound(const char *filename) { ALenum err, format, type, channels; ALuint rate, buffer; size_t datalen; void *data; FilePtr sound; /* Open the audio file */ sound = openAudioFile(filename, 1000); if(!sound) { fprintf(stderr, "Could not open audio in %s\n", filename); closeAudioFile(sound); return 0; } /* Get the sound format, and figure out the OpenAL format */ if(getAudioInfo(sound, &rate, &channels, &type) != 0) { fprintf(stderr, "Error getting audio info for %s\n", filename); closeAudioFile(sound); return 0; } format = GetFormat(channels, type, alIsBufferFormatSupportedSOFT); if(format == AL_NONE) { fprintf(stderr, "Unsupported format (%s, %s) for %s\n", ChannelsName(channels), TypeName(type), filename); closeAudioFile(sound); return 0; } /* Decode the whole audio stream to a buffer. */ data = decodeAudioStream(sound, &datalen); if(!data) { fprintf(stderr, "Failed to read audio from %s\n", filename); closeAudioFile(sound); return 0; } /* Buffer the audio data into a new buffer object, then free the data and * close the file. */ buffer = 0; alGenBuffers(1, &buffer); alBufferSamplesSOFT(buffer, rate, format, BytesToFrames(datalen, channels, type), channels, type, data); free(data); closeAudioFile(sound); /* Check if an error occured, and clean up if so. */ err = alGetError(); if(err != AL_NO_ERROR) { fprintf(stderr, "OpenAL Error: %s\n", alGetString(err)); if(alIsBuffer(buffer)) alDeleteBuffers(1, &buffer); return 0; } return buffer; } int main(int argc, char **argv) { ALuint source, buffer; ALdouble offsets[2]; ALenum state; /* Print out usage if no file was specified */ if(argc < 2) { fprintf(stderr, "Usage: %s <filename>\n", argv[0]); return 1; } /* Initialize OpenAL with the default device, and check for EFX support. */ if(InitAL() != 0) return 1; if(!alIsExtensionPresent("AL_SOFT_source_latency")) { fprintf(stderr, "Error: AL_SOFT_source_latency not supported\n"); CloseAL(); return 1; } /* Define a macro to help load the function pointers. */ #define LOAD_PROC(x) ((x) = alGetProcAddress(#x)) LOAD_PROC(alSourcedSOFT); LOAD_PROC(alSource3dSOFT); LOAD_PROC(alSourcedvSOFT); LOAD_PROC(alGetSourcedSOFT); LOAD_PROC(alGetSource3dSOFT); LOAD_PROC(alGetSourcedvSOFT); LOAD_PROC(alSourcei64SOFT); LOAD_PROC(alSource3i64SOFT); LOAD_PROC(alSourcei64vSOFT); LOAD_PROC(alGetSourcei64SOFT); LOAD_PROC(alGetSource3i64SOFT); LOAD_PROC(alGetSourcei64vSOFT); if(alIsExtensionPresent("AL_SOFT_buffer_samples")) { LOAD_PROC(alBufferSamplesSOFT); LOAD_PROC(alIsBufferFormatSupportedSOFT); } #undef LOAD_PROC /* Load the sound into a buffer. */ buffer = LoadSound(argv[1]); if(!buffer) { CloseAL(); return 1; } /* Create the source to play the sound with. */ source = 0; alGenSources(1, &source); alSourcei(source, AL_BUFFER, buffer); assert(alGetError()==AL_NO_ERROR && "Failed to setup sound source"); /* Play the sound until it finishes. */ alSourcePlay(source); do { Sleep(10); alGetSourcei(source, AL_SOURCE_STATE, &state); /* Get the source offset and latency. AL_SEC_OFFSET_LATENCY_SOFT will * place the offset (in seconds) in offsets[0], and the time until that * offset will be heard (in seconds) in offsets[1]. */ alGetSourcedvSOFT(source, AL_SEC_OFFSET_LATENCY_SOFT, offsets); printf("\rOffset: %f - Latency:%3u ms ", offsets[0], (ALuint)(offsets[1]*1000)); fflush(stdout); } while(alGetError() == AL_NO_ERROR && state == AL_PLAYING); printf("\n"); /* All done. Delete resources, and close OpenAL. */ alDeleteSources(1, &source); alDeleteBuffers(1, &buffer); CloseAL(); return 0; }