/*
* audio_out_win.c
* Copyright (C) 2000-2002 Michel Lespinasse <walken@zoy.org>
* Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
*
* This file is part of a52dec, a free ATSC A-52 stream decoder.
* See http://liba52.sourceforge.net/ for updates.
*
* a52dec is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* a52dec is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#ifdef LIBAO_WIN
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <windows.h>
#include <mmsystem.h>
#include <inttypes.h>
#include "a52.h"
#include "audio_out.h"
#include "audio_out_internal.h"
static void win_close (ao_instance_t * _instance);
/* each buffer has a size of 256 samples. Using 40 of them will give us about
* 1/5 sec of buffered sound for a 48000hz stream */
#define NUMBUF 40
typedef struct win_instance_s {
ao_instance_t ao;
HWAVEOUT h_waveout;
WAVEHDR waveheader[NUMBUF];
int16_t int16_samples[NUMBUF][256*2];
int current_buffer;
int sample_rate;
int set_params;
int flags;
} win_instance_t;
static int win_setup (ao_instance_t * _instance, int sample_rate, int * flags,
sample_t * level, sample_t * bias)
{
win_instance_t * instance = (win_instance_t *) _instance;
if ((instance->set_params == 0) && (instance->sample_rate != sample_rate))
return 1;
instance->sample_rate = sample_rate;
*flags = instance->flags;
*level = 1;
*bias = 384;
return 0;
}
static int win_play (ao_instance_t * _instance, int flags, sample_t * _samples)
{
win_instance_t * instance = (win_instance_t *) _instance;
int current_buffer;
MMRESULT result;
#ifdef LIBA52_DOUBLE
float samples[256 * 2];
int i;
for (i = 0; i < 256 * 2; i++)
samples[i] = _samples[i];
#else
float * samples = _samples;
#endif
flags &= A52_CHANNEL_MASK | A52_LFE;
if (instance->set_params) {
WAVEFORMATEX waveformat;
MMRESULT result;
int i;
waveformat.wFormatTag = WAVE_FORMAT_PCM;
waveformat.nChannels = 2;
waveformat.nSamplesPerSec = instance->sample_rate;
waveformat.wBitsPerSample = 16;
waveformat.nBlockAlign = 4;
waveformat.nAvgBytesPerSec = 4 * instance->sample_rate;
result = waveOutOpen (&instance->h_waveout, WAVE_MAPPER, &waveformat,
0 /*callback*/, 0 /*data*/, CALLBACK_NULL);
if (result != MMSYSERR_NOERROR) {
fprintf (stderr, "Can not open waveOut device\n");
return 1;
}
for (i = 0; i < NUMBUF; i++) {
instance->waveheader[i].lpData = (LPSTR)instance->int16_samples[i];
instance->waveheader[i].dwBufferLength = 256 * 2 * sizeof(int16_t);
instance->waveheader[i].dwFlags = WHDR_DONE;
}
instance->flags = flags;
instance->set_params = 0;
} else if ((flags == A52_DOLBY) && (instance->flags == A52_STEREO)) {
fprintf (stderr, "Switching from stereo to dolby surround\n");
instance->flags = A52_DOLBY;
} else if ((flags == A52_STEREO) && (instance->flags == A52_DOLBY)) {
fprintf (stderr, "Switching from dolby surround to stereo\n");
instance->flags = A52_STEREO;
} else if (flags != instance->flags)
return 1;
current_buffer = instance->current_buffer;
instance->current_buffer = (current_buffer + 1) % NUMBUF;
while (!(instance->waveheader[current_buffer].dwFlags & WHDR_DONE))
Sleep (1000 * 256 / instance->sample_rate);
result = waveOutUnprepareHeader (instance->h_waveout,
&instance->waveheader[current_buffer],
sizeof(WAVEHDR));
if (result != MMSYSERR_NOERROR) {
fprintf (stderr, "waveOutUnprepareHeader failed\n");
return 1;
}
instance->waveheader[current_buffer].dwFlags = 0;
result = waveOutPrepareHeader (instance->h_waveout,
&instance->waveheader[current_buffer],
sizeof(WAVEHDR));
if (result != MMSYSERR_NOERROR) {
fprintf (stderr, "waveOutPrepareHeader failed\n");
return 1;
}
float2s16_2 (samples, instance->int16_samples[current_buffer]);
result = waveOutWrite (instance->h_waveout,
&instance->waveheader[current_buffer],
sizeof(WAVEHDR));
if (result != MMSYSERR_NOERROR) {
fprintf (stderr, "waveOutWrite failed\n");
return 1;
}
return 0;
}
static void win_close (ao_instance_t * _instance)
{
win_instance_t * instance = (win_instance_t *) _instance;
int i;
waveOutReset (instance->h_waveout);
for (i = 0; i < NUMBUF; i++)
waveOutUnprepareHeader (instance->h_waveout,
&instance->waveheader[i],
sizeof(WAVEHDR));
waveOutClose (instance->h_waveout);
}
static ao_instance_t * win_open (int flags)
{
win_instance_t * instance;
instance = malloc (sizeof (win_instance_t));
if (instance == NULL)
return NULL;
instance->ao.setup = win_setup;
instance->ao.play = win_play;
instance->ao.close = win_close;
instance->sample_rate = 0;
instance->set_params = 1;
instance->flags = flags;
return (ao_instance_t *) instance;
}
ao_instance_t * ao_win_open (void)
{
return win_open (A52_STEREO);
}
ao_instance_t * ao_windolby_open (void)
{
return win_open (A52_DOLBY);
}
#endif