[3d8280]: src / demuxers / demux_dts.c  Maximize  Restore  History

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/*
* Copyright (C) 2005 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
*
* Raw DTS Demuxer by James Stembridge (jstembridge@gmail.com)
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#ifdef HAVE_ALLOCA_H
#include <alloca.h>
#endif
#define LOG_MODULE "demux_dts"
#define LOG_VERBOSE
/*
#define LOG
*/
#include <xine/xine_internal.h>
#include <xine/xineutils.h>
#include <xine/demux.h>
#include <xine/buffer.h>
#include "bswap.h"
#include "group_audio.h"
#define DATA_TAG 0x61746164
typedef struct {
demux_plugin_t demux_plugin;
xine_stream_t *stream;
fifo_buffer_t *video_fifo;
fifo_buffer_t *audio_fifo;
input_plugin_t *input;
int status;
int seek_flag;
int samples_per_frame;
int sample_rate;
int frame_size;
off_t data_start;
} demux_dts_t;
typedef struct {
demux_class_t demux_class;
} demux_dts_class_t;
static const int dts_sample_rates[] =
{
0, 8000, 16000, 32000, 0, 0, 11025, 22050, 44100, 0, 0,
12000, 24000, 48000, 96000, 192000
};
static int open_dts_file(demux_dts_t *this) {
int i, offset = 0;
uint32_t syncword = 0;
size_t peak_size = 0;
uint32_t blocksize;
uint8_t *peak;
lprintf("open_dts_file\n");
blocksize = this->input->get_blocksize(this->input);
if (blocksize && INPUT_IS_SEEKABLE(this->input)) {
// this->input->seek(this->input, 0, SEEK_SET);
buf_element_t *buf = this->input->read_block(this->input,
this->stream->audio_fifo,
blocksize);
this->input->seek(this->input, 0, SEEK_SET);
if (!buf)
return 0;
peak = alloca(peak_size = buf->size);
xine_fast_memcpy(peak, buf->content, peak_size);
buf->free_buffer(buf);
} else {
peak = alloca(peak_size = MAX_PREVIEW_SIZE);
if (_x_demux_read_header(this->input, peak, peak_size) != peak_size)
return 0;
}
lprintf("peak size: %d\n", peak_size);
/* Check for wav header, as we'll handle DTS with a wav header shoved
* on the front for CD burning */
if ( memcmp(peak, "RIFF", 4) == 0 || memcmp(&peak[8], "WAVEfmt ", 8) == 0 ) {
/* Check this looks like a cd audio wav */
unsigned int audio_type;
xine_waveformatex *wave = (xine_waveformatex *) &peak[20];
_x_waveformatex_le2me(wave);
audio_type = _x_formattag_to_buf_audio(wave->wFormatTag);
if ((audio_type != BUF_AUDIO_LPCM_LE) || (wave->nChannels != 2) ||
(wave->nSamplesPerSec != 44100) || (wave->wBitsPerSample != 16))
return 0;
lprintf("looks like a cd audio wav file\n");
/* Find the data chunk */
offset = 20 + _X_LE_32(&peak[16]);
while (offset < peak_size-8) {
unsigned int chunk_tag = _X_LE_32(&peak[offset]);
unsigned int chunk_size = _X_LE_32(&peak[offset+4]);
if (chunk_tag == DATA_TAG) {
offset += 8;
lprintf("found the start of the data at offset %d\n", offset);
break;
} else
offset += chunk_size;
}
}
/* DTS bitstream encoding version
* -1 - not detected
* 0 - 16 bits and big endian
* 1 - 16 bits and low endian (detection not implemented)
* 2 - 14 bits and big endian (detection not implemented)
* 3 - 14 bits and low endian
*/
int dts_version = -1;
/* Look for a valid DTS syncword */
for (i=offset; i<peak_size-1; i++) {
/* 16 bits and big endian bitstream */
if (syncword == 0x7ffe8001) {
dts_version = 0;
break;
}
/* 14 bits and little endian bitstream */
else if ((syncword == 0xff1f00e8) &&
((peak[i] & 0xf0) == 0xf0) && (peak[i+1] == 0x07)) {
dts_version = 3;
break;
}
syncword = (syncword << 8) | peak[i];
}
if (dts_version == -1) {
xprintf (this->stream->xine, XINE_VERBOSITY_LOG,
LOG_MODULE ": unsupported DTS stream type, or not a DTS stream\n");
return 0;
}
this->data_start = i-4;
lprintf("found DTS syncword at offset %d\n", i-4);
if (i < peak_size-9) {
unsigned int nblks, fsize, sfreq;
switch (dts_version)
{
case 0: /* BE16 */
nblks = ((peak[this->data_start+4] & 0x01) << 6) |
((peak[this->data_start+5] & 0xfc) >> 2);
fsize = (((peak[this->data_start+5] & 0x03) << 12) |(peak[this->data_start+6] << 4) |
((peak[this->data_start+7] & 0xf0) >> 4)) + 1;
sfreq = (peak[this->data_start+8] & 0x3c) >> 2;
break;
case 3: /* LE14 */
nblks = ((peak[this->data_start+4] & 0x07) << 4) |
((peak[this->data_start+7] & 0x3c) >> 2);
fsize = (((peak[this->data_start+7] & 0x03) << 12) |
(peak[this->data_start+6] << 4) |
((peak[this->data_start+9] & 0x3c) >> 2)) + 1;
sfreq = peak[this->data_start+8] & 0x0f;
break;
}
if ((sfreq > sizeof(dts_sample_rates)/sizeof(int)) ||
(dts_sample_rates[sfreq] == 0))
return 0;
/* Big assumption - this is CBR data */
this->samples_per_frame = (nblks + 1) * 32;
switch (dts_version)
{
case 0: /* BE16 */
case 1: /* LE16 */
this->frame_size = fsize * 8 / 16 * 2;
break;
case 2: /* BE14 */
case 3: /* LE14 */
this->frame_size = fsize * 8 / 14 * 2;
break;
}
this->sample_rate = dts_sample_rates[sfreq];
lprintf("samples per frame: %d\n", this->samples_per_frame);
lprintf("frame size: %d\n", this->frame_size);
lprintf("sample rate: %d\n", this->sample_rate);
/* Seek to start of DTS data */
this->input->seek(this->input, this->data_start, SEEK_SET);
return 1;
}
return 0;
}
static int demux_dts_send_chunk (demux_plugin_t *this_gen) {
demux_dts_t *this = (demux_dts_t *) this_gen;
buf_element_t *buf = NULL;
off_t current_stream_pos;
int64_t audio_pts;
int frame_number;
uint32_t blocksize;
current_stream_pos = this->input->get_current_pos(this->input) -
this->data_start;
frame_number = current_stream_pos / this->frame_size;
audio_pts = frame_number;
audio_pts *= 90000;
audio_pts *= this->samples_per_frame;
audio_pts /= this->sample_rate;
if (this->seek_flag) {
_x_demux_control_newpts(this->stream, audio_pts, BUF_FLAG_SEEK);
this->seek_flag = 0;
}
blocksize = this->input->get_blocksize(this->input);
if (blocksize) {
buf = this->input->read_block(this->input, this->audio_fifo,
blocksize);
if (!buf) {
this->status = DEMUX_FINISHED;
return this->status;
}
} else {
buf = this->audio_fifo->buffer_pool_alloc (this->audio_fifo);
buf->size = this->input->read(this->input, buf->content,
this->frame_size);
}
if (buf->size == 0) {
buf->free_buffer(buf);
this->status = DEMUX_FINISHED;
return this->status;
}
buf->type = BUF_AUDIO_DTS;
if( this->input->get_length (this->input) )
buf->extra_info->input_normpos = (int)( (double) current_stream_pos *
65535 / (this->input->get_length(this->input) - this->data_start) );
buf->extra_info->input_time = audio_pts / 90;
buf->pts = audio_pts;
buf->decoder_flags |= BUF_FLAG_FRAME_END;
this->audio_fifo->put (this->audio_fifo, buf);
return this->status;
}
static void demux_dts_send_headers(demux_plugin_t *this_gen) {
demux_dts_t *this = (demux_dts_t *) this_gen;
buf_element_t *buf;
this->video_fifo = this->stream->video_fifo;
this->audio_fifo = this->stream->audio_fifo;
this->status = DEMUX_OK;
/* load stream information */
_x_stream_info_set(this->stream, XINE_STREAM_INFO_HAS_VIDEO, 0);
_x_stream_info_set(this->stream, XINE_STREAM_INFO_HAS_AUDIO, 1);
/* send start buffers */
_x_demux_control_start(this->stream);
/* send init info to decoders */
if (this->audio_fifo) {
buf = this->audio_fifo->buffer_pool_alloc (this->audio_fifo);
buf->type = BUF_AUDIO_DTS;
buf->decoder_flags = BUF_FLAG_HEADER|BUF_FLAG_FRAME_END;
buf->size = 0;
this->audio_fifo->put (this->audio_fifo, buf);
}
}
static int demux_dts_get_stream_length (demux_plugin_t *this_gen) {
demux_dts_t *this = (demux_dts_t *) this_gen;
int stream_length = 0;
if (this->input->get_length(this->input)) {
stream_length = this->input->get_length(this->input) - this->data_start;
stream_length /= this->frame_size;
stream_length *= this->samples_per_frame;
stream_length /= this->sample_rate;
stream_length *= 1000;
lprintf("running time: %u\n", stream_length);
}
return stream_length;
}
static int demux_dts_seek (demux_plugin_t *this_gen,
off_t start_pos, int start_time, int playing) {
demux_dts_t *this = (demux_dts_t *) this_gen;
this->seek_flag = 1;
this->status = DEMUX_OK;
_x_demux_flush_engine (this->stream);
/* if input is non-seekable, do not proceed with the rest of this
* seek function */
if (!INPUT_IS_SEEKABLE(this->input))
return this->status;
start_pos = (off_t) ( (double) start_pos / 65535 *
(this->input->get_length(this->input) - this->data_start) );
if (start_time) {
int length = demux_dts_get_stream_length (this_gen);
if (length != 0) {
start_pos = start_time *
(this->input->get_length(this->input) - this->data_start) / length;
}
}
/* divide the requested offset integer-wise by the frame alignment and
* multiply by the frame alignment to determine the new starting block */
start_pos /= this->frame_size;
start_pos *= this->frame_size;
start_pos += this->data_start;
this->input->seek(this->input, start_pos, SEEK_SET);
return this->status;
}
static int demux_dts_get_status (demux_plugin_t *this_gen) {
demux_dts_t *this = (demux_dts_t *) this_gen;
return this->status;
}
static uint32_t demux_dts_get_capabilities(demux_plugin_t *this_gen) {
return DEMUX_CAP_NOCAP;
}
static int demux_dts_get_optional_data(demux_plugin_t *this_gen,
void *data, int data_type) {
return DEMUX_OPTIONAL_UNSUPPORTED;
}
static demux_plugin_t *open_plugin (demux_class_t *class_gen, xine_stream_t *stream,
input_plugin_t *input) {
demux_dts_t *this;
this = xine_xmalloc (sizeof (demux_dts_t));
this->stream = stream;
this->input = input;
this->demux_plugin.send_headers = demux_dts_send_headers;
this->demux_plugin.send_chunk = demux_dts_send_chunk;
this->demux_plugin.seek = demux_dts_seek;
this->demux_plugin.dispose = default_demux_plugin_dispose;
this->demux_plugin.get_status = demux_dts_get_status;
this->demux_plugin.get_stream_length = demux_dts_get_stream_length;
this->demux_plugin.get_capabilities = demux_dts_get_capabilities;
this->demux_plugin.get_optional_data = demux_dts_get_optional_data;
this->demux_plugin.demux_class = class_gen;
this->status = DEMUX_FINISHED;
switch (stream->content_detection_method) {
case METHOD_BY_MRL:
case METHOD_BY_CONTENT:
case METHOD_EXPLICIT:
if (!open_dts_file(this)) {
free (this);
return NULL;
}
break;
default:
free (this);
return NULL;
}
return &this->demux_plugin;
}
void *demux_dts_init_plugin (xine_t *xine, void *data) {
demux_dts_class_t *this;
this = xine_xmalloc (sizeof (demux_dts_class_t));
this->demux_class.open_plugin = open_plugin;
this->demux_class.description = N_("Raw DTS demux plugin");
this->demux_class.identifier = "DTS";
this->demux_class.mimetypes = NULL;
this->demux_class.extensions = "dts";
this->demux_class.dispose = default_demux_class_dispose;
return this;
}