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/*
* Copyright (C) 2000-2001 the xine project
*
* This file is part of xine, a unix 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 1.15 2002/03/11 12:31:25 guenter Exp $
*
* 04-09-2001 DTS passtrough (C) Joachim Koenig
* 09-12-2001 DTS passthrough inprovements (C) James Courtier-Dutton
*
*/
#ifndef __sun
/* required for swab() */
#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 dts_decoder_s {
audio_decoder_t audio_decoder;
uint32_t rate;
uint32_t bits_per_sample;
uint32_t number_of_channels;
uint32_t audio_caps;
ao_instance_t *audio_out;
int output_open;
} dts_decoder_t;
int dts_can_handle (audio_decoder_t *this_gen, int buf_type) {
buf_type &= 0xFFFF0000;
return ( buf_type == BUF_AUDIO_DTS);
}
void dts_reset (audio_decoder_t *this_gen) {
/* dts_decoder_t *this = (dts_decoder_t *) this_gen; */
}
void dts_init (audio_decoder_t *this_gen, ao_instance_t *audio_out) {
dts_decoder_t *this = (dts_decoder_t *) this_gen;
this->audio_out = audio_out;
this->output_open = 0;
this->rate = 48000;
this->bits_per_sample=16;
this->number_of_channels=2;
this->audio_caps = audio_out->get_capabilities(audio_out);
}
void dts_decode_data (audio_decoder_t *this_gen, buf_element_t *buf) {
dts_decoder_t *this = (dts_decoder_t *) this_gen;
uint8_t *data_in = (uint8_t *)buf->content;
uint8_t *data_out;
audio_buffer_t *audio_buffer;
uint32_t ac5_type;
uint32_t ac5_spdif_type;
uint32_t ac5_length=0;
uint32_t ac5_pcm_length;
uint32_t number_of_frames;
uint32_t first_access_unit;
int n;
if ((this->audio_caps & AO_CAP_MODE_AC5) == 0) {
return;
}
if (!this->output_open) {
this->output_open = (this->audio_out->open (this->audio_out, this->bits_per_sample,
this->rate,
AO_CAP_MODE_AC5));
}
if (!this->output_open)
return;
number_of_frames = buf->decoder_info[1]; /* Number of frames */
first_access_unit = buf->decoder_info[2]; /* First access unit */
if (number_of_frames > 2) {
return;
}
for(n=1;n<=number_of_frames;n++) {
data_in += ac5_length;
if(data_in >= (buf->content+buf->size)) {
printf("DTS length error\n");
return;
}
audio_buffer = this->audio_out->get_buffer (this->audio_out);
audio_buffer->frame_header_count = buf->decoder_info[1]; /* Number of frames */
audio_buffer->first_access_unit = buf->decoder_info[2]; /* First access unit */
/* printf("DTS first access unit=%u\n",audio_buffer->first_access_unit); */
if (n == first_access_unit) {
audio_buffer->vpts = buf->pts;
} else {
audio_buffer->vpts = 0;
}
data_out=(uint8_t *) audio_buffer->mem;
if ((data_in[0] != 0x7f) ||
(data_in[1] != 0xfe) ||
(data_in[2] != 0x80) ||
(data_in[3] != 0x01)) {
printf("DTS Sync bad\n");
return;
}
ac5_type=((data_in[4] & 0x01) << 6) | ((data_in[5] >>2) & 0x3f);
ac5_length=((data_in[5] & 0x03) << 12) | ((data_in[6] & 0xff) << 4) | ((data_in[7] & 0xf0) >> 4);
ac5_length++;
switch(ac5_type) {
case 0x0f:
ac5_spdif_type = 0x000b; /* DTS */
break;
case 0x1f:
ac5_spdif_type = 0x000c; /* DTS */
break;
case 0x3f:
ac5_spdif_type = 0x000d; /* DTS */
break;
default:
ac5_spdif_type = 0x0000; /* DTS */
break;
}
/* printf("DTS AC5 length=%d\n",ac5_length); */
/*
for(i=2000;i<2048;i++) {
printf("%02x ",data[i]);
}
printf("\n");
*/
if (ac5_length > 8191) {
printf("ac5_length too long\n");
return;
}
if (ac5_length <= 248) {
ac5_pcm_length = 64;
} else if (ac5_length <= 504) {
ac5_pcm_length = 128;
} else if (ac5_length <= 1016) {
ac5_pcm_length = 256;
} else if (ac5_length <= 2040) {
ac5_pcm_length = 512;
} else if (ac5_length <= 4088) {
ac5_pcm_length = 1024;
} else {
printf("BAD AC5 length\n");
ac5_pcm_length = 512;
}
if (ac5_pcm_length < (512 )) {
ac5_pcm_length = 512 ;
}
/* printf("DTS length=%d loop=%d pts=%u\n",ac5_pcm_length,n,audio_buffer->vpts); */
audio_buffer->num_frames = ac5_pcm_length;
data_out[0] = 0x72; data_out[1] = 0xf8; /* spdif syncword */
data_out[2] = 0x1f; data_out[3] = 0x4e; /* .............. */
data_out[4] = ac5_spdif_type; /* DTS data */
data_out[5] = 0; /* Unknown */
data_out[6] = (ac5_length << 3) & 0xff; /* ac5_length * 8 */
data_out[7] = ((ac5_length ) >> 5) & 0xff;
swab(data_in, &data_out[8], ac5_length );
this->audio_out->put_buffer (this->audio_out, audio_buffer);
}
}
void dts_close (audio_decoder_t *this_gen) {
dts_decoder_t *this = (dts_decoder_t *) this_gen;
if (this->output_open)
this->audio_out->close (this->audio_out);
this->output_open = 0;
}
static char *dts_get_id(void) {
return "dts";
}
audio_decoder_t *init_audio_decoder_plugin (int iface_version, xine_t *xine) {
dts_decoder_t *this ;
if (iface_version != 5) {
printf( "libdts: plugin doesn't support plugin API version %d.\n"
"libdts: this means there's a version mismatch between xine and this "
"libdts: decoder plugin.\nInstalling current plugins should help.\n",
iface_version);
return NULL;
}
this = (dts_decoder_t *) malloc (sizeof (dts_decoder_t));
this->audio_decoder.interface_version = iface_version;
this->audio_decoder.can_handle = dts_can_handle;
this->audio_decoder.init = dts_init;
this->audio_decoder.decode_data = dts_decode_data;
this->audio_decoder.reset = dts_reset;
this->audio_decoder.close = dts_close;
this->audio_decoder.get_identifier = dts_get_id;
this->audio_decoder.priority = 1;
return (audio_decoder_t *) this;
}
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