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/*
* Copyright (C) 2000-2003 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
*/
/**
* @file
* @author James Courtier-Dutton <james@superbug.demon.co.uk>
*
* @date 2001-08-31 Added LPCM rate sensing
*/
#ifndef __sun
#define _XOPEN_SOURCE 500
#endif
/* avoid compiler warnings */
#define _BSD_SOURCE 1
#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 <xine/xine_internal.h>
#include <xine/audio_out.h>
#include <xine/buffer.h>
#ifdef WIN32
#include <winsock.h>
/*#include <Winsock2.h>*/ /* htons */
#endif
typedef struct {
audio_decoder_class_t decoder_class;
} lpcm_class_t;
typedef struct lpcm_decoder_s {
audio_decoder_t audio_decoder;
xine_stream_t *stream;
uint32_t rate;
uint32_t bits_per_sample;
uint32_t number_of_channels;
uint32_t ao_cap_mode;
int output_open;
int cpu_be; /**< TRUE, if we're a Big endian CPU */
} lpcm_decoder_t;
static void lpcm_reset (audio_decoder_t *this_gen) {
/* lpcm_decoder_t *this = (lpcm_decoder_t *) this_gen; */
}
static void lpcm_discontinuity (audio_decoder_t *this_gen) {
}
static 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;
int format_changed = 0;
/* Drop preview data */
if (buf->decoder_flags & BUF_FLAG_PREVIEW)
return;
/* get config byte from mpeg2 stream */
if ( (buf->decoder_flags & BUF_FLAG_SPECIAL) &&
buf->decoder_info[1] == BUF_SPECIAL_LPCM_CONFIG ) {
unsigned int bits_per_sample = 16;
unsigned int sample_rate = 0;
unsigned int num_channels;
num_channels = (buf->decoder_info[2] & 0x7) + 1;
switch ((buf->decoder_info[2]>>4) & 3) {
case 0: sample_rate = 48000; break;
case 1: sample_rate = 96000; break;
case 2: sample_rate = 44100; break;
case 3: sample_rate = 32000; break;
}
switch ((buf->decoder_info[2]>>6) & 3) {
case 0: bits_per_sample = 16; break;
case 1: bits_per_sample = 20; break;
case 2: bits_per_sample = 24; break;
}
if( this->bits_per_sample != bits_per_sample ||
this->number_of_channels != num_channels ||
this->rate != sample_rate ||
!this->output_open ) {
this->bits_per_sample = bits_per_sample;
this->number_of_channels = num_channels;
this->rate = sample_rate;
format_changed++;
}
}
if( buf->decoder_flags & BUF_FLAG_STDHEADER ) {
this->rate=buf->decoder_info[1];
this->bits_per_sample=buf->decoder_info[2] ;
this->number_of_channels=buf->decoder_info[3] ;
format_changed++;
}
/*
* (re-)open output device
*/
if ( format_changed ) {
if (this->output_open)
this->stream->audio_out->close (this->stream->audio_out, this->stream);
this->ao_cap_mode=_x_ao_channels2mode(this->number_of_channels);
/* force 24-bit samples into 16 bits for now */
if (this->bits_per_sample == 24)
this->output_open = (this->stream->audio_out->open) (this->stream->audio_out, this->stream,
16,
this->rate,
this->ao_cap_mode) ;
else
this->output_open = (this->stream->audio_out->open) (this->stream->audio_out, this->stream,
this->bits_per_sample,
this->rate,
this->ao_cap_mode) ;
/* stream/meta info */
_x_meta_info_set_utf8(this->stream, XINE_META_INFO_AUDIOCODEC, "Linear PCM");
_x_stream_info_set(this->stream, XINE_STREAM_INFO_AUDIO_BITRATE,
this->bits_per_sample * this->rate * this->number_of_channels);
}
if (!this->output_open || (buf->decoder_flags & BUF_FLAG_HEADER) )
return;
audio_buffer = this->stream->audio_out->get_buffer (this->stream->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 if( this->bits_per_sample == 24 ) {
uint8_t *s = (uint8_t *)sample_buffer;
uint8_t *d = (uint8_t *)audio_buffer->mem;
int n = buf->size;
while (n >= 3) {
if ( stream_be ) {
if ( stream_be == this->cpu_be ) {
*d++ = s[0];
*d++ = s[1];
} else {
*d++ = s[1];
*d++ = s[0];
}
} else {
if ( stream_be == this->cpu_be ) {
*d++ = s[1];
*d++ = s[2];
}
else
{
*d++ = s[2];
*d++ = s[1];
}
}
s += 3;
n -= 3;
}
if ( (d - (uint8_t*)audio_buffer->mem)/2*3 < buf->size )
xprintf(this->stream->xine, XINE_VERBOSITY_DEBUG, "lpcm_decoder: lost %i bytes\n", (int)(buf->size - (d - (uint8_t*)audio_buffer->mem))/2*3);
} 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->stream->audio_out->put_buffer (this->stream->audio_out, audio_buffer, this->stream);
}
static void lpcm_dispose (audio_decoder_t *this_gen) {
lpcm_decoder_t *this = (lpcm_decoder_t *) this_gen;
if (this->output_open)
this->stream->audio_out->close (this->stream->audio_out, this->stream);
this->output_open = 0;
free (this_gen);
}
static audio_decoder_t *open_plugin (audio_decoder_class_t *class_gen, xine_stream_t *stream) {
lpcm_decoder_t *this ;
this = (lpcm_decoder_t *) xine_xmalloc (sizeof (lpcm_decoder_t));
this->audio_decoder.decode_data = lpcm_decode_data;
this->audio_decoder.reset = lpcm_reset;
this->audio_decoder.discontinuity = lpcm_discontinuity;
this->audio_decoder.dispose = lpcm_dispose;
this->output_open = 0;
this->rate = 0;
this->bits_per_sample=0;
this->number_of_channels=0;
this->ao_cap_mode=0;
this->stream = stream;
this->cpu_be = ( htons(1) == 1 );
return &this->audio_decoder;
}
static void *init_plugin (xine_t *xine, void *data) {
lpcm_class_t *this ;
this = (lpcm_class_t *) xine_xmalloc (sizeof (lpcm_class_t));
this->decoder_class.open_plugin = open_plugin;
this->decoder_class.identifier = "Linear PCM";
this->decoder_class.description = N_("Linear PCM audio decoder plugin");
this->decoder_class.dispose = default_audio_decoder_class_dispose;
return this;
}
static const uint32_t audio_types[] = {
BUF_AUDIO_LPCM_BE, BUF_AUDIO_LPCM_LE, 0
};
static const decoder_info_t dec_info_audio = {
audio_types, /* supported types */
1 /* priority */
};
const plugin_info_t xine_plugin_info[] EXPORTED = {
/* type, API, "name", version, special_info, init_function */
{ PLUGIN_AUDIO_DECODER, 16, "pcm", XINE_VERSION_CODE, &dec_info_audio, init_plugin },
{ PLUGIN_NONE, 0, "", 0, NULL, NULL }
};