/* * OpenAL Source Latency Example * * Copyright (c) 2012 by Chris Robinson * * 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 #include #include #include #include #include "sndfile.h" #include "AL/al.h" #include "AL/alext.h" #include "common/alhelpers.h" 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; ALuint buffer; SNDFILE *sndfile; SF_INFO sfinfo; short *membuf; sf_count_t num_frames; ALsizei num_bytes; /* Open the audio file and check that it's usable. */ sndfile = sf_open(filename, SFM_READ, &sfinfo); if(!sndfile) { fprintf(stderr, "Could not open audio in %s: %s\n", filename, sf_strerror(sndfile)); return 0; } if(sfinfo.frames < 1 || sfinfo.frames > (sf_count_t)(INT_MAX/sizeof(short))/sfinfo.channels) { fprintf(stderr, "Bad sample count in %s (%" PRId64 ")\n", filename, sfinfo.frames); sf_close(sndfile); return 0; } /* Get the sound format, and figure out the OpenAL format */ format = AL_NONE; if(sfinfo.channels == 1) format = AL_FORMAT_MONO16; else if(sfinfo.channels == 2) format = AL_FORMAT_STEREO16; else if(sfinfo.channels == 3) { if(sf_command(sndfile, SFC_WAVEX_GET_AMBISONIC, NULL, 0) == SF_AMBISONIC_B_FORMAT) format = AL_FORMAT_BFORMAT2D_16; } else if(sfinfo.channels == 4) { if(sf_command(sndfile, SFC_WAVEX_GET_AMBISONIC, NULL, 0) == SF_AMBISONIC_B_FORMAT) format = AL_FORMAT_BFORMAT3D_16; } if(!format) { fprintf(stderr, "Unsupported channel count: %d\n", sfinfo.channels); sf_close(sndfile); return 0; } /* Decode the whole audio file to a buffer. */ membuf = malloc((size_t)(sfinfo.frames * sfinfo.channels) * sizeof(short)); num_frames = sf_readf_short(sndfile, membuf, sfinfo.frames); if(num_frames < 1) { free(membuf); sf_close(sndfile); fprintf(stderr, "Failed to read samples in %s (%" PRId64 ")\n", filename, num_frames); return 0; } num_bytes = (ALsizei)(num_frames * sfinfo.channels) * (ALsizei)sizeof(short); /* Buffer the audio data into a new buffer object, then free the data and * close the file. */ buffer = 0; alGenBuffers(1, &buffer); alBufferData(buffer, format, membuf, num_bytes, sfinfo.samplerate); free(membuf); sf_close(sndfile); /* Check if an error occurred, and clean up if so. */ err = alGetError(); if(err != AL_NO_ERROR) { fprintf(stderr, "OpenAL Error: %s\n", alGetString(err)); if(buffer && 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 arguments were specified */ if(argc < 2) { fprintf(stderr, "Usage: %s [-device ] \n", argv[0]); return 1; } /* Initialize OpenAL, and check for source_latency support. */ argv++; argc--; if(InitAL(&argv, &argc) != 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(T, x) ((x) = FUNCTION_CAST(T, alGetProcAddress(#x))) LOAD_PROC(LPALSOURCEDSOFT, alSourcedSOFT); LOAD_PROC(LPALSOURCE3DSOFT, alSource3dSOFT); LOAD_PROC(LPALSOURCEDVSOFT, alSourcedvSOFT); LOAD_PROC(LPALGETSOURCEDSOFT, alGetSourcedSOFT); LOAD_PROC(LPALGETSOURCE3DSOFT, alGetSource3dSOFT); LOAD_PROC(LPALGETSOURCEDVSOFT, alGetSourcedvSOFT); LOAD_PROC(LPALSOURCEI64SOFT, alSourcei64SOFT); LOAD_PROC(LPALSOURCE3I64SOFT, alSource3i64SOFT); LOAD_PROC(LPALSOURCEI64VSOFT, alSourcei64vSOFT); LOAD_PROC(LPALGETSOURCEI64SOFT, alGetSourcei64SOFT); LOAD_PROC(LPALGETSOURCE3I64SOFT, alGetSource3i64SOFT); LOAD_PROC(LPALGETSOURCEI64VSOFT, alGetSourcei64vSOFT); #undef LOAD_PROC /* Load the sound into a buffer. */ buffer = LoadSound(argv[0]); if(!buffer) { CloseAL(); return 1; } /* Create the source to play the sound with. */ source = 0; alGenSources(1, &source); alSourcei(source, AL_BUFFER, (ALint)buffer); assert(alGetError()==AL_NO_ERROR && "Failed to setup sound source"); /* Play the sound until it finishes. */ alSourcePlay(source); do { al_nssleep(10000000); 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 down OpenAL. */ alDeleteSources(1, &source); alDeleteBuffers(1, &buffer); CloseAL(); return 0; }