Add a wave file writing backend
This commit is contained in:
Chris Robinson
parent
e1d0ad749b
commit
f10408739e
@ -61,6 +61,8 @@ struct {
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{ "winmm", alcWinMMInit, EmptyFuncs },
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#endif
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{ "wave", alc_wave_init, EmptyFuncs },
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{ NULL, NULL, EmptyFuncs }
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};
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#undef EmptyFuncs
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335
Alc/wave.c
Normal file
335
Alc/wave.c
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@ -0,0 +1,335 @@
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/**
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* OpenAL cross platform audio library
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* Copyright (C) 1999-2007 by authors.
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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* Or go to http://www.gnu.org/copyleft/lgpl.html
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*/
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#include "config.h"
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#include <stdlib.h>
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#include <stdio.h>
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#include <memory.h>
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#include "alMain.h"
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#include "AL/al.h"
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#include "AL/alc.h"
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typedef struct {
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FILE *f;
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long DataStart;
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ALvoid *buffer;
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ALuint size;
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int killNow;
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ALvoid *thread;
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} wave_data;
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static ALCchar *waveDevice;
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static ALuint WaveProc(ALvoid *ptr)
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{
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ALCdevice *pDevice = (ALCdevice*)ptr;
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wave_data *data = (wave_data*)pDevice->ExtraData;
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ALuint frameSize;
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ALuint now, last;
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size_t WriteCnt;
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ALuint avail;
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union {
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short s;
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char b[sizeof(short)];
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} uSB;
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uSB.s = 1;
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frameSize = aluBytesFromFormat(pDevice->Format) *
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aluChannelsFromFormat(pDevice->Format);
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last = timeGetTime();
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while(!data->killNow)
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{
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now = timeGetTime();
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avail = (now-last) * pDevice->Frequency / 1000;
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if(avail < pDevice->UpdateFreq/4)
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{
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Sleep(1);
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continue;
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}
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while(avail > 0)
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{
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SuspendContext(NULL);
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WriteCnt = min(data->size, avail);
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aluMixData(pDevice->Context, data->buffer, WriteCnt * frameSize,
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pDevice->Format);
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ProcessContext(NULL);
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if(uSB.b[0] != 1 && aluBytesFromFormat(pDevice->Format) > 1)
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{
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ALubyte *bytes = data->buffer;
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ALuint i;
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for(i = 0;i < WriteCnt*frameSize;i++)
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fputc(bytes[i^1], data->f);
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}
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else
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fwrite(data->buffer, frameSize, WriteCnt, data->f);
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if(ferror(data->f))
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{
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AL_PRINT("Error writing to file\n");
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data->killNow = 1;
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break;
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}
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avail -= WriteCnt;
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}
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last = now;
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}
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return 0;
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}
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static ALCboolean wave_open_playback(ALCdevice *device, const ALCchar *deviceName)
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{
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wave_data *data;
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ALuint channels;
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ALuint bits;
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char fname[64];
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int i;
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strncpy(fname, GetConfigValue("wave", "file", ""), sizeof(fname)-1);
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fname[sizeof(fname)-1] = 0;
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if(!fname[0])
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return ALC_FALSE;
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if(deviceName)
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{
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if(strcmp(deviceName, waveDevice) != 0)
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return ALC_FALSE;
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device->szDeviceName = waveDevice;
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}
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else
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device->szDeviceName = waveDevice;
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data = (wave_data*)calloc(1, sizeof(wave_data));
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data->f = fopen(fname, "wb");
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if(!data->f)
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{
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free(data);
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AL_PRINT("Could not open file '%s': %s\n", fname, strerror(errno));
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return ALC_FALSE;
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}
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bits = aluBytesFromFormat(device->Format) * 8;
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channels = aluChannelsFromFormat(device->Format);
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switch(bits)
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{
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case 8:
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case 16:
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if(channels == 0)
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{
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AL_PRINT("Unknown format?! %x\n", device->Format);
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fclose(data->f);
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free(data);
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return ALC_FALSE;
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}
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break;
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default:
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AL_PRINT("Unknown format?! %x\n", device->Format);
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fclose(data->f);
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free(data);
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return ALC_FALSE;
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}
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fprintf(data->f, "RIFF");
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fputc(0, data->f); // 'RIFF' header len; filled in at close
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fputc(0, data->f);
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fputc(0, data->f);
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fputc(0, data->f);
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fprintf(data->f, "WAVE");
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fprintf(data->f, "fmt ");
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fputc(16, data->f); // 'fmt ' header len; 16 bytes for PCM
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fputc(0, data->f);
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fputc(0, data->f);
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fputc(0, data->f);
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// 16-bit val, format type id (PCM: 1)
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fputc(1, data->f);
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fputc(0, data->f);
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// 16-bit val, channel count
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fputc(channels&0xff, data->f);
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fputc((channels>>8)&0xff, data->f);
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// 32-bit val, frequency
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fputc(device->Frequency&0xff, data->f);
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fputc((device->Frequency>>8)&0xff, data->f);
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fputc((device->Frequency>>16)&0xff, data->f);
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fputc((device->Frequency>>24)&0xff, data->f);
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// 32-bit val, bytes per second
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i = device->Frequency * channels * bits / 8;
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fputc(i&0xff, data->f);
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fputc((i>>8)&0xff, data->f);
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fputc((i>>16)&0xff, data->f);
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fputc((i>>24)&0xff, data->f);
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// 16-bit val, frame size
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i = channels * bits / 8;
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fputc(i&0xff, data->f);
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fputc((i>>8)&0xff, data->f);
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// 16-bit val, bits per sample
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fputc(bits&0xff, data->f);
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fputc((bits>>8)&0xff, data->f);
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fprintf(data->f, "data");
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fputc(0, data->f); // 'data' header len; filled in at close
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fputc(0, data->f);
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fputc(0, data->f);
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fputc(0, data->f);
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data->DataStart = ftell(data->f);
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if(data->DataStart == -1 || ferror(data->f))
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{
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AL_PRINT("Error writing header: %s\n", strerror(errno));
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fclose(data->f);
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free(data);
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return ALC_FALSE;
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}
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device->MaxNoOfSources = 256;
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device->UpdateFreq = max(device->UpdateFreq, 2048);
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data->size = device->UpdateFreq;
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data->buffer = malloc(data->size * channels * bits / 8);
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if(!data->buffer)
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{
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AL_PRINT("buffer malloc failed\n");
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fclose(data->f);
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free(data);
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return ALC_FALSE;
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}
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device->ExtraData = data;
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data->thread = StartThread(WaveProc, device);
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if(data->thread == NULL)
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{
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device->ExtraData = NULL;
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fclose(data->f);
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free(data->buffer);
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free(data);
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return ALC_FALSE;
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}
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return ALC_TRUE;
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}
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static void wave_close_playback(ALCdevice *device)
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{
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wave_data *data = (wave_data*)device->ExtraData;
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ALuint dataLen;
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long size;
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data->killNow = 1;
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StopThread(data->thread);
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size = ftell(data->f);
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if(size > 0)
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{
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dataLen = size - data->DataStart;
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if(fseek(data->f, data->DataStart-4, SEEK_SET) == 0)
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{
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fputc(dataLen&0xff, data->f); // 'data' header len
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fputc((dataLen>>8)&0xff, data->f);
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fputc((dataLen>>16)&0xff, data->f);
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fputc((dataLen>>24)&0xff, data->f);
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}
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if(fseek(data->f, 4, SEEK_SET) == 0)
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{
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size -= 8;
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fputc(size&0xff, data->f); // 'WAVE' header len
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fputc((size>>8)&0xff, data->f);
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fputc((size>>16)&0xff, data->f);
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fputc((size>>24)&0xff, data->f);
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}
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}
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fclose(data->f);
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free(data->buffer);
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free(data);
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device->ExtraData = NULL;
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}
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static ALCboolean wave_open_capture(ALCdevice *pDevice, const ALCchar *deviceName, ALCuint frequency, ALCenum format, ALCsizei SampleSize)
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{
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(void)pDevice;
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(void)deviceName;
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(void)frequency;
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(void)format;
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(void)SampleSize;
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return ALC_FALSE;
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}
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static void wave_close_capture(ALCdevice *pDevice)
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{
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(void)pDevice;
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}
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static void wave_start_capture(ALCdevice *pDevice)
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{
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(void)pDevice;
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}
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static void wave_stop_capture(ALCdevice *pDevice)
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{
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(void)pDevice;
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}
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static void wave_capture_samples(ALCdevice *pDevice, ALCvoid *pBuffer, ALCuint lSamples)
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{
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(void)pDevice;
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(void)pBuffer;
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(void)lSamples;
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}
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static ALCuint wave_available_samples(ALCdevice *pDevice)
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{
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(void)pDevice;
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return 0;
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}
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BackendFuncs wave_funcs = {
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wave_open_playback,
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wave_close_playback,
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wave_open_capture,
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wave_close_capture,
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wave_start_capture,
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wave_stop_capture,
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wave_capture_samples,
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wave_available_samples
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};
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void alc_wave_init(BackendFuncs *func_list)
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{
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*func_list = wave_funcs;
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waveDevice = AppendDeviceList("Wave File Writer");
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AppendAllDeviceList(waveDevice);
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}
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@ -190,6 +190,7 @@ SET(ALC_OBJS Alc/ALc.c
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Alc/alcRing.c
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Alc/alcThread.c
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Alc/bs2b.c
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Alc/wave.c
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)
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SET(BACKENDS "")
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@ -263,6 +264,9 @@ IF("${HAVE_WINDOWS_H}")
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ENDIF()
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ENDIF()
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# This is always available
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SET(BACKENDS ${BACKENDS} WaveFile)
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# End configuration
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CONFIGURE_FILE(
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"${OpenAL_SOURCE_DIR}/config.h.in"
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@ -149,6 +149,7 @@ void alc_alsa_init(BackendFuncs *func_list);
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void alc_oss_init(BackendFuncs *func_list);
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void alcDSoundInit(BackendFuncs *func_list);
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void alcWinMMInit(BackendFuncs *FuncList);
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void alc_wave_init(BackendFuncs *func_list);
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struct ALCdevice_struct
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@ -44,7 +44,7 @@ drivers = # Sets the backend driver list order, comma-seperated. Unknown
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# backends and duplicated names are ignored, and unlisted backends
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# won't be considered for use. An empty list means the default.
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# Default is:
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# alsa,oss,dsound,winmm
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# alsa,oss,dsound,winmm,wave
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[alsa] # ALSA backend stuff
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device = default # Sets the device name for the default playback device.
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@ -67,3 +67,9 @@ capture = /dev/dsp # Sets the device name for OSS capture. Default is /dev/dsp
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[winmm] # Windows Multimedia backend stuff
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# Nothing yet...
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[wave] # Wave File Writer stuff
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file = # Sets the filename of the wave file to write to. An empty name
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# prevents the backend from opening, even when explicitly requested.
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# THIS WILL OVERWRITE EXISTING FILES WITHOUT QUESTION!
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# Default is empty
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