openalbridge/ssound.c
author nemo
Fri, 16 Oct 2009 11:58:28 +0000
changeset 2479 3d7b69dbf7b4
parent 2468 0b62498c201a
permissions -rw-r--r--
fix Tiy typo
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/*
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 * OpenAL Bridge - a simple portable library for OpenAL interface
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 * Copyright (c) 2009 Vittorio Giovara <vittorio.giovara@gmail.com>,
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 *                    Mario Liebisch <mario.liebisch+hw@googlemail.com>
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU Lesser General Public License as published by
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 * the Free Software Foundation; version 2 of the License
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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 */
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#include "ssound.h"
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#include "loaders.h"
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extern SSound_t aSounds[MAX_SOUNDS];
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extern ALuint sources[MAX_SOURCES];
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extern const ALfloat NV[3];
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extern const ALfloat LO[6];
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extern int iNumSounds;
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extern char *prog;
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char SSound_load (SSound_t* pSound, const char* cFilename) {
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        uint32_t magic;
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        ALenum format;
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        ALsizei bitsize, freq;
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        char *data;
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        FILE* fp;
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        snprintf(pSound->Filename, 256, "%s", cFilename);
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        pSound->source = -1;
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        alGenBuffers(1, &pSound->Buffer);
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        if(alGetError() != AL_NO_ERROR) {
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                fprintf(stderr, "CSound: Couldn't create buffer.\n");
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                return 0;
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        }
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        fp = fopen(pSound->Filename, "rb");
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        if(!fp) {
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                fprintf(stderr, "CSound: Couldn't open file for reading.\n");
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                return 0;
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        }
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        if(fread(&magic, sizeof(uint32_t), 1, fp) < 1)
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        {
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                fclose(fp);
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                fprintf(stderr, "CSound: Couldn't read file header.\n");
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                return 0;
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        }
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        fclose(fp);
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        switch (ENDIAN_BIG_32(magic)) {
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                case OGG_FILE_FORMAT:
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                        load_oggvorbis (pSound->Filename, &format, &data, &bitsize, &freq);
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                        break;
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                case WAV_FILE_FORMAT:
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                        load_wavpcm (pSound->Filename, &format, &data, &bitsize, &freq);
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                        break;
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                default:
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                        errno = EINVAL;
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                        err_ret ("(%s) ERROR - File format (%08X) not supported", prog, ENDIAN_BIG_32(magic));
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                        return 0;
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                        break;
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        }
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        alBufferData(pSound->Buffer, format, data, bitsize, freq);
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        if(alGetError() != AL_NO_ERROR)
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        {
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                fprintf(stderr, "CSound: Couldn't write buffer data.\n");
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                return 0;
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        }
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        free(data);
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        return 1;
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}
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void SSound_close(SSound_t* pSound)
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{
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        SSound_stop(pSound);
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        alDeleteBuffers(1, &pSound->Buffer);
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        return;
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}
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void SSound_play(SSound_t* pSound, const char bLoop) {
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        int i, j;
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        if(pSound->source == -1) // need a new source
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        {
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                for(i = 0; i < MAX_SOURCES; i++)
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                {
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                        ALint state;
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                        alGetSourcei(sources[i], AL_SOURCE_STATE, &state);
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                        if(state != AL_PLAYING && state != AL_PAUSED)
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                        {
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#ifdef DEBUG
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                                printf("using source %d (state 0x%x) for buffer.\n", i, state);
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#endif
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                                alSourceStop(sources[pSound->source]);
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                                alGetError();
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								// lookup buffers associated with this source and reset them
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								for(j = 0; j < iNumSounds; j++)
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									if(aSounds[j].source == i)
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										aSounds[j].source = -1;
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                                break;
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                        }
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                }
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                if(i == MAX_SOURCES) // no available source found; skip
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                {
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#ifdef DEBUG
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                        printf("no source to play buffer %d!\n", i);
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#endif
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                        return;
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                }
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                pSound->source = i;
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        }
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        else // reuse already playing source
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        {
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                alSourceStop(sources[pSound->source]);
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        }
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        alSourcei (sources[pSound->source], AL_BUFFER, pSound->Buffer);
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        alSourcef (sources[pSound->source], AL_PITCH,            1.0f);
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        alSourcef (sources[pSound->source], AL_GAIN,             1.0f);
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        alSourcefv(sources[pSound->source], AL_POSITION, NV          );
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        alSourcefv(sources[pSound->source], AL_VELOCITY, NV          );
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        alSourcei (sources[pSound->source], AL_LOOPING,  bLoop       );
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        alSourcePlay(sources[pSound->source]);
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        if((i = alGetError()) != AL_NO_ERROR)
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        {
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                fprintf(stderr, "CSound: SourcePlay error 0x%4x in source %d\n", i, pSound->source);
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        }
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#ifdef DEBUG
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        fprintf(stderr, "play %s%s [%d]\n", pSound->Filename, bLoop ? " forever" : " once", pSound->source);
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#endif
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        usleep(0);
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        return;
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}
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void SSound_pause(const SSound_t* pSound) {
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        if(pSound->source == -1) // not playing
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                return;
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        alSourcePause(sources[pSound->source]);
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#ifdef DEBUG
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        fprintf(stderr, "pause %s\n", pSound->Filename);
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#endif
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        return;
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}
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void SSound_continue(const SSound_t* pSound) {
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        if(pSound->source == -1) // not playing
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                return;
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        alSourcePlay(sources[pSound->source]);
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#ifdef DEBUG
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        fprintf(stderr, "pause %s\n", pSound->Filename);
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#endif
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        return;
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}
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void SSound_stop(SSound_t* pSound) {
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        if(pSound->source == -1) // not playing
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                return;
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        alSourceStop(sources[pSound->source]);
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        pSound->source = -1;
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#ifdef DEBUG
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        fprintf(stderr, "stop %s\n", pSound->Filename);
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#endif
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        return;
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}
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void SSound_volume(const SSound_t* pSound, const float fPercentage) {
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        if(pSound->source == -1) // not playing
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                return;
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        alSourcef(sources[pSound->source], AL_GAIN, fPercentage);
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        return;
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}