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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
*
* RoQ DPCM Audio Decoder by Mike Melanson (melanson@pcisys.net)
* For more information regarding the RoQ file format, visit:
* http://www.csse.monash.edu.au/~timf/
*
* $Id: roqaudio.c,v 1.3 2002/06/12 12:22:37 f1rmb Exp $
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <string.h>
#include "audio_out.h"
#include "buffer.h"
#include "xine_internal.h"
#include "xineutils.h"
#include "bswap.h"
#define RoQ_AUDIO_SAMPLE_RATE 22050
#define RoQ_AUDIO_BITS_PER_SAMPLE 16
#define AUDIOBUFSIZE 128*1024
#define LE_16(x) (le2me_16(*(unsigned short *)(x)))
#define LE_32(x) (le2me_32(*(unsigned int *)(x)))
#define CLAMP_S16(x) if (x < -32768) x = -32768; \
else if (x > 32767) x = 32767;
#define SE_16BIT(x) if (x & 0x8000) x -= 0x10000;
typedef struct roqaudio_decoder_s {
audio_decoder_t audio_decoder;
int64_t pts;
ao_instance_t *audio_out;
int output_open;
int output_channels;
unsigned char *buf;
int bufsize;
int size;
short square_array[256];
} roqaudio_decoder_t;
static int roqaudio_can_handle (audio_decoder_t *this_gen, int buf_type) {
return ((buf_type & 0xFFFF0000) == BUF_AUDIO_ROQ);
}
static void roqaudio_reset (audio_decoder_t *this_gen) {
}
static void roqaudio_init (audio_decoder_t *this_gen, ao_instance_t *audio_out) {
roqaudio_decoder_t *this = (roqaudio_decoder_t *) this_gen;
int i;
short square;
this->audio_out = audio_out;
this->output_open = 0;
/* initialize tables of squares */
for (i = 0; i < 128; i++) {
square = i * i;
this->square_array[i] = square;
this->square_array[i + 128] = -square;
}
}
static void roqaudio_decode_data (audio_decoder_t *this_gen, buf_element_t *buf) {
roqaudio_decoder_t *this = (roqaudio_decoder_t *) this_gen;
audio_buffer_t *audio_buffer;
int in, out;
int predictor[2];
int channel_number = 0;
if (buf->decoder_flags & BUF_FLAG_HEADER) {
this->output_channels = buf->decoder_info[3];
this->buf = xine_xmalloc(AUDIOBUFSIZE);
this->bufsize = AUDIOBUFSIZE;
this->size = 0;
return;
}
if (!this->output_open) {
this->output_open = this->audio_out->open(this->audio_out,
RoQ_AUDIO_BITS_PER_SAMPLE, RoQ_AUDIO_SAMPLE_RATE,
(this->output_channels == 2) ? AO_CAP_MODE_STEREO : AO_CAP_MODE_MONO);
}
/* if the audio still isn't open, bail */
if (!this->output_open)
return;
//printf ("received audio packet: %d bytes, pts = %lld, flags = %X\n",
// buf->size, buf->pts, buf->decoder_flags);
if( this->size + buf->size > this->bufsize ) {
this->bufsize = this->size + 2 * buf->size;
printf("RoQ: increasing source buffer to %d to avoid overflow.\n",
this->bufsize);
this->buf = realloc( this->buf, this->bufsize );
}
xine_fast_memcpy (&this->buf[this->size], buf->content, buf->size);
this->size += buf->size;
if (buf->decoder_flags & BUF_FLAG_FRAME_END) { /* time to decode a frame */
audio_buffer = this->audio_out->get_buffer (this->audio_out);
out = 0;
// prepare the initial predictors
if (this->output_channels == 1)
predictor[0] = LE_16(&this->buf[6]);
else
{
predictor[0] = this->buf[7] << 8;
predictor[1] = this->buf[6] << 8;
}
SE_16BIT(predictor[0]);
SE_16BIT(predictor[1]);
/* decode the samples */
for (in = 8; in < this->size; in++)
{
predictor[channel_number] += this->square_array[this->buf[in]];
CLAMP_S16(predictor[channel_number]);
audio_buffer->mem[out++] = predictor[channel_number];
// toggle channel
channel_number ^= this->output_channels - 1;
}
audio_buffer->vpts = buf->pts;
audio_buffer->num_frames =
(buf->size - 8) / this->output_channels;
//printf (" audio buffer size = %d, buf size = %d, chan = %d, # of frames sent = %d\n",
// audio_buffer->mem_size, this->size,
// this->output_channels, audio_buffer->num_frames);
this->audio_out->put_buffer (this->audio_out, audio_buffer);
this->size = 0;
}
}
static void roqaudio_close (audio_decoder_t *this_gen) {
roqaudio_decoder_t *this = (roqaudio_decoder_t *) this_gen;
if (this->output_open)
this->audio_out->close (this->audio_out);
this->output_open = 0;
}
static char *roqaudio_get_id(void) {
return "RoQ Audio";
}
static void roqaudio_dispose (audio_decoder_t *this_gen) {
free (this_gen);
}
audio_decoder_t *init_audio_decoder_plugin (int iface_version, xine_t *xine) {
roqaudio_decoder_t *this ;
if (iface_version != 8) {
printf(_("RoQ Audio: plugin doesn't support plugin API version %d.\n"
"RoQ Audio: this means there's a version mismatch between xine and this\n"
"RoQ Audio: decoder plugin.\nInstalling current plugins should help.\n"),
iface_version);
return NULL;
}
this = (roqaudio_decoder_t *) malloc (sizeof (roqaudio_decoder_t));
this->audio_decoder.interface_version = iface_version;
this->audio_decoder.can_handle = roqaudio_can_handle;
this->audio_decoder.init = roqaudio_init;
this->audio_decoder.decode_data = roqaudio_decode_data;
this->audio_decoder.reset = roqaudio_reset;
this->audio_decoder.close = roqaudio_close;
this->audio_decoder.get_identifier = roqaudio_get_id;
this->audio_decoder.dispose = roqaudio_dispose;
this->audio_decoder.priority = 5;
return (audio_decoder_t *) this;
}
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