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/* Ogle - A video player
* Copyright (C) 2002 Bjrn Englund
*
* This program 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.
*
* This program 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
*/
#ifdef LIBOGLEAO_NULL
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <inttypes.h>
#include "ogle_ao.h"
#include "ogle_ao_private.h"
typedef struct null_instance_s {
ogle_ao_instance_t ao;
int sample_rate;
int samples_written;
int sample_frame_size;
int initialized;
} null_instance_t;
static
int null_init(ogle_ao_instance_t *_instance,
ogle_ao_audio_info_t *audio_info)
{
int single_sample_size;
null_instance_t *instance = (null_instance_t *)_instance;
#if 0
if(instance->initialized) {
return -1; // for now we must close and open the device for reinit
}
#endif
switch(audio_info->encoding) {
case OGLE_AO_ENCODING_LINEAR:
/* ok */
break;
default:
/* not supported */
return -1;
}
if(audio_info->chtypes != OGLE_AO_CHTYPE_UNSPECIFIED) {
// do this only if we have requested specific channels in chtypes
// otherwise trust the nr channels
audio_info->chtypes = OGLE_AO_CHTYPE_LEFT | OGLE_AO_CHTYPE_RIGHT;
audio_info->channels = 2;
}
if(audio_info->chlist) {
free(audio_info->chlist);
}
audio_info->chlist = NULL;
if(audio_info->chtypes != OGLE_AO_CHTYPE_UNSPECIFIED) {
audio_info->channels = 2;
audio_info->chlist = malloc(audio_info->channels *
sizeof(ogle_ao_chtype_t));
audio_info->chlist[0] = OGLE_AO_CHTYPE_LEFT;
audio_info->chlist[1] = OGLE_AO_CHTYPE_RIGHT;
}
instance->sample_rate = audio_info->sample_rate;
single_sample_size = (audio_info->sample_resolution + 7) / 8;
if(single_sample_size > 2) {
single_sample_size = 4;
}
instance->sample_frame_size =
audio_info->channels * single_sample_size;
audio_info->sample_frame_size = instance->sample_frame_size;
instance->initialized = 1;
return 0;
}
static
int null_play(ogle_ao_instance_t *_instance, void *samples, size_t nbyte)
{
null_instance_t *instance = (null_instance_t *)_instance;
instance->samples_written += nbyte / instance->sample_frame_size;
return 0;
}
static
int null_odelay(ogle_ao_instance_t *_instance, uint32_t *samples_return)
{
//null_instance_t *instance = (null_instance_t *)_instance;
/* We'll get strange sync if we do it like this. We'd have to take
* a time stamp and then calculate from the current time and sample
* rate how many we 'should have' played. */
// int samples_played;
// samples_played = (time_now - time_at_init) * sample_rate;
// odelay = instance->samples_written - samples_played;
// *samples_return = 0;
return -1; // Not supported by null driver
}
static
void null_close(ogle_ao_instance_t *_instance)
{
//null_instance_t *instance = (null_instance_t *)_instance;
}
static
int null_flush(ogle_ao_instance_t *_instance)
{
//null_instance_t *instance = (null_instance_t *)_instance;
return 0;
}
static
int null_drain(ogle_ao_instance_t *_instance)
{
//null_instance_t *instance = (null_instance_t *)_instance;
return 0;
}
static
ogle_ao_instance_t *null_open(char *dev)
{
null_instance_t *instance;
instance = malloc(sizeof(null_instance_t));
if(instance == NULL)
return NULL;
instance->ao.init = null_init;
instance->ao.play = null_play;
instance->ao.close = null_close;
instance->ao.odelay = null_odelay;
instance->ao.flush = null_flush;
instance->ao.drain = null_drain;
instance->initialized = 0;
instance->sample_rate = 0;
instance->samples_written = 0;
instance->sample_frame_size = 0;
return (ogle_ao_instance_t *)instance;
}
/* The one directly exported function */
ogle_ao_instance_t *ao_null_open(char *dev)
{
return null_open(dev);
}
#endif
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