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/*
* Copyright (C) 2000-2002 the xine project
*
* This file is part of xine, a free video player.
*
* xine 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.
*
* xine 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
*
* $Id: xine_decoder.c,v 1.25 2002/05/25 19:19:18 siggi Exp $
*
* 31-8-2001 Added LPCM rate sensing.
* (c) 2001 James Courtier-Dutton James@superbug.demon.co.uk
*
* stuff needed to turn libac3 into a xine decoder plugin
*/
#ifndef __sun
#define _XOPEN_SOURCE 500
#endif
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <netinet/in.h> /* ntohs */
#include "audio_out.h"
#include "buffer.h"
#include "xine_internal.h"
typedef struct lpcm_decoder_s {
audio_decoder_t audio_decoder;
uint32_t rate;
uint32_t bits_per_sample;
uint32_t number_of_channels;
uint32_t ao_cap_mode;
ao_instance_t *audio_out;
int output_open;
int cpu_be; /* TRUE, if we're a Big endian CPU */
} lpcm_decoder_t;
int lpcm_can_handle (audio_decoder_t *this_gen, int buf_type) {
buf_type &= 0xFFFF0000;
return ( buf_type == BUF_AUDIO_LPCM_BE ||
buf_type == BUF_AUDIO_LPCM_LE );
}
void lpcm_reset (audio_decoder_t *this_gen) {
/* lpcm_decoder_t *this = (lpcm_decoder_t *) this_gen; */
}
void lpcm_init (audio_decoder_t *this_gen, ao_instance_t *audio_out) {
lpcm_decoder_t *this = (lpcm_decoder_t *) this_gen;
this->audio_out = audio_out;
this->output_open = 0;
this->rate = 0;
this->bits_per_sample=0;
this->number_of_channels=0;
this->ao_cap_mode=0;
this->cpu_be = ( htons(1) == 1 );
}
void lpcm_decode_data (audio_decoder_t *this_gen, buf_element_t *buf) {
lpcm_decoder_t *this = (lpcm_decoder_t *) this_gen;
int16_t *sample_buffer=(int16_t *)buf->content;
int stream_be;
audio_buffer_t *audio_buffer;
if (buf->decoder_flags & BUF_FLAG_PREVIEW) {
this->rate=buf->decoder_info[1];
this->bits_per_sample=buf->decoder_info[2] ;
this->number_of_channels=buf->decoder_info[3] ;
this->ao_cap_mode=(this->number_of_channels == 2) ? AO_CAP_MODE_STEREO : AO_CAP_MODE_MONO;
return;
}
if (!this->output_open) {
/*
* with dvdnav we do not get a preview buffer with audio format
* information (buf->decoder_flags & BUF_FLAG_PREVIEW).
* grab the audio format from the first audio data buffer, in case
* the audio format is not yet known.
*/
if (this->rate == 0 && this->bits_per_sample == 0) {
this->rate=buf->decoder_info[1];
this->bits_per_sample=buf->decoder_info[2] ;
this->number_of_channels=buf->decoder_info[3] ;
this->ao_cap_mode=(this->number_of_channels == 2) ? AO_CAP_MODE_STEREO : AO_CAP_MODE_MONO;
}
printf ("liblpcm: opening audio output (%d Hz sampling rate, mode=%d)\n",
this->rate, this->ao_cap_mode);
this->output_open = this->audio_out->open (this->audio_out,
(this->bits_per_sample<=16)?this->bits_per_sample:16,
this->rate,
this->ao_cap_mode) ;
}
if (!this->output_open)
return;
audio_buffer = this->audio_out->get_buffer (this->audio_out);
/* Swap LPCM samples into native byte order, if necessary */
buf->type &= 0xffff0000;
stream_be = ( buf->type == BUF_AUDIO_LPCM_BE );
if( this->bits_per_sample == 16 ){
if (stream_be != this->cpu_be)
swab (sample_buffer, audio_buffer->mem, buf->size);
else
memcpy (audio_buffer->mem, sample_buffer, buf->size);
}
else if( this->bits_per_sample == 20 ) {
uint8_t *s = (uint8_t *)sample_buffer;
uint8_t *d = (uint8_t *)audio_buffer->mem;
int n = buf->size;
if (stream_be != this->cpu_be) {
while( n >= 0 ) {
swab( s, d, 8 );
s += 10;
d += 8;
n -= 10;
}
} else {
while( n >= 0 ) {
memcpy( d, s, 8 );
s += 10;
d += 8;
n -= 10;
}
}
}
else {
memcpy (audio_buffer->mem, sample_buffer, buf->size);
}
audio_buffer->vpts = buf->pts;
audio_buffer->num_frames = (((buf->size*8)/this->number_of_channels)/this->bits_per_sample);
this->audio_out->put_buffer (this->audio_out, audio_buffer);
}
void lpcm_close (audio_decoder_t *this_gen) {
lpcm_decoder_t *this = (lpcm_decoder_t *) this_gen;
if (this->output_open)
this->audio_out->close (this->audio_out);
this->output_open = 0;
}
static char *lpcm_get_id(void) {
return "lpcm";
}
static void lpcm_dispose (audio_decoder_t *this_gen) {
free (this_gen);
}
audio_decoder_t *init_audio_decoder_plugin (int iface_version, xine_t *xine) {
lpcm_decoder_t *this ;
if (iface_version != 8) {
printf( "liblpcm: plugin doesn't support plugin API version %d.\n"
"liblpcm: this means there's a version mismatch between xine and this "
"liblpcm: decoder plugin.\nInstalling current plugins should help.\n",
iface_version);
return NULL;
}
this = (lpcm_decoder_t *) malloc (sizeof (lpcm_decoder_t));
this->audio_decoder.interface_version = iface_version;
this->audio_decoder.can_handle = lpcm_can_handle;
this->audio_decoder.init = lpcm_init;
this->audio_decoder.decode_data = lpcm_decode_data;
this->audio_decoder.reset = lpcm_reset;
this->audio_decoder.close = lpcm_close;
this->audio_decoder.get_identifier = lpcm_get_id;
this->audio_decoder.dispose = lpcm_dispose;
this->audio_decoder.priority = 1;
return (audio_decoder_t *) this;
}
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