1 /*****************************************************************************
2 * dts.c : raw DTS stream input module for vlc
3 *****************************************************************************
4 * Copyright (C) 2001 VideoLAN
5 * $Id: dts.c,v 1.10 2004/02/25 17:48:52 fenrir Exp $
7 * Authors: Gildas Bazin <gbazin@netcourrier.com>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
28 #include <vlc/input.h>
29 #include <vlc_codec.h>
31 #define DTS_PACKET_SIZE 16384
32 #define DTS_PROBE_SIZE (DTS_PACKET_SIZE * 4)
33 #define DTS_MAX_HEADER_SIZE 11
35 /*****************************************************************************
37 *****************************************************************************/
38 static int Open ( vlc_object_t * );
39 static void Close ( vlc_object_t * );
40 static int Demux ( input_thread_t * );
42 static int Control( input_thread_t *, int, va_list );
50 decoder_t *p_packetizer;
55 /*****************************************************************************
57 *****************************************************************************/
59 set_description( _("Raw DTS demuxer") );
60 set_capability( "demux", 155 );
61 set_callbacks( Open, Close );
62 add_shortcut( "dts" );
65 /*****************************************************************************
66 * CheckSync: Check if buffer starts with a DTS sync code
67 *****************************************************************************/
68 static int CheckSync( uint8_t *p_peek )
70 /* 14 bits, little endian version of the bitstream */
71 if( p_peek[0] == 0xff && p_peek[1] == 0x1f &&
72 p_peek[2] == 0x00 && p_peek[3] == 0xe8 &&
73 (p_peek[4] & 0xf0) == 0xf0 && p_peek[5] == 0x07 )
77 /* 14 bits, big endian version of the bitstream */
78 else if( p_peek[0] == 0x1f && p_peek[1] == 0xff &&
79 p_peek[2] == 0xe8 && p_peek[3] == 0x00 &&
80 p_peek[4] == 0x07 && (p_peek[5] & 0xf0) == 0xf0)
84 /* 16 bits, big endian version of the bitstream */
85 else if( p_peek[0] == 0x7f && p_peek[1] == 0xfe &&
86 p_peek[2] == 0x80 && p_peek[3] == 0x01 )
90 /* 16 bits, little endian version of the bitstream */
91 else if( p_peek[0] == 0xfe && p_peek[1] == 0x7f &&
92 p_peek[2] == 0x01 && p_peek[3] == 0x80 )
100 /*****************************************************************************
101 * Open: initializes ES structures
102 *****************************************************************************/
103 static int Open( vlc_object_t * p_this )
105 input_thread_t *p_input = (input_thread_t *)p_this;
110 p_input->pf_demux = Demux;
111 p_input->pf_demux_control = Control;
112 p_input->pf_rewind = NULL;
114 /* Check if we are dealing with a WAV file */
115 if( input_Peek( p_input, &p_peek, 20 ) == 20 &&
116 !strncmp( p_peek, "RIFF", 4 ) && !strncmp( &p_peek[8], "WAVE", 4 ) )
120 /* Find the wave format header */
122 while( strncmp( p_peek + i_peek - 8, "fmt ", 4 ) )
124 i_size = GetDWLE( p_peek + i_peek - 4 );
125 if( i_size + i_peek > DTS_PROBE_SIZE ) return VLC_EGENERIC;
126 i_peek += i_size + 8;
128 if( input_Peek( p_input, &p_peek, i_peek ) != i_peek )
132 /* Sanity check the wave format header */
133 i_size = GetDWLE( p_peek + i_peek - 4 );
134 if( i_size + i_peek > DTS_PROBE_SIZE ) return VLC_EGENERIC;
135 i_peek += i_size + 8;
136 if( input_Peek( p_input, &p_peek, i_peek ) != i_peek )
138 if( GetWLE( p_peek + i_peek - i_size - 8 /* wFormatTag */ ) !=
139 1 /* WAVE_FORMAT_PCM */ )
141 if( GetWLE( p_peek + i_peek - i_size - 6 /* nChannels */ ) != 2 )
143 if( GetDWLE( p_peek + i_peek - i_size - 4 /* nSamplesPerSec */ ) !=
147 /* Skip the wave header */
148 while( strncmp( p_peek + i_peek - 8, "data", 4 ) )
150 i_size = GetDWLE( p_peek + i_peek - 4 );
151 if( i_size + i_peek > DTS_PROBE_SIZE ) return VLC_EGENERIC;
152 i_peek += i_size + 8;
154 if( input_Peek( p_input, &p_peek, i_peek ) != i_peek )
158 /* Some DTS wav files don't begin with a sync code so we do a more
159 * extensive search */
160 i_size = input_Peek( p_input, &p_peek, DTS_PROBE_SIZE );
161 i_size -= DTS_MAX_HEADER_SIZE;
163 while( i_peek < i_size )
165 if( CheckSync( p_peek + i_peek ) != VLC_SUCCESS )
166 /* The data is stored in 16 bits words */
173 /* Have a peep at the show. */
174 if( input_Peek( p_input, &p_peek, i_peek + DTS_MAX_HEADER_SIZE * 2 ) <
175 i_peek + DTS_MAX_HEADER_SIZE * 2 )
177 /* Stream too short */
178 msg_Warn( p_input, "cannot peek()" );
182 if( CheckSync( p_peek + i_peek ) != VLC_SUCCESS )
184 if( p_input->psz_demux && !strncmp( p_input->psz_demux, "dts", 3 ) )
187 msg_Err( p_input, "this doesn't look like a DTS audio stream, "
188 "continuing anyway" );
196 p_input->p_demux_data = p_sys = malloc( sizeof( demux_sys_t ) );
197 p_sys->b_start = VLC_TRUE;
198 p_sys->i_mux_rate = 0;
201 * Load the DTS packetizer
203 p_sys->p_packetizer = vlc_object_create( p_input, VLC_OBJECT_DECODER );
204 p_sys->p_packetizer->pf_decode_audio = 0;
205 p_sys->p_packetizer->pf_decode_video = 0;
206 p_sys->p_packetizer->pf_decode_sub = 0;
207 p_sys->p_packetizer->pf_packetize = 0;
209 /* Initialization of decoder structure */
210 es_format_Init( &p_sys->p_packetizer->fmt_in, AUDIO_ES,
211 VLC_FOURCC( 'd', 't', 's', ' ' ) );
213 p_sys->p_packetizer->p_module =
214 module_Need( p_sys->p_packetizer, "packetizer", NULL );
215 if( !p_sys->p_packetizer->p_module )
217 msg_Err( p_input, "cannot find DTS packetizer" );
221 /* Create one program */
222 vlc_mutex_lock( &p_input->stream.stream_lock );
223 if( input_InitStream( p_input, 0 ) == -1 )
225 vlc_mutex_unlock( &p_input->stream.stream_lock );
226 msg_Err( p_input, "cannot init stream" );
229 p_input->stream.i_mux_rate = 0;
230 vlc_mutex_unlock( &p_input->stream.stream_lock );
233 es_out_Add( p_input->p_es_out, &p_sys->p_packetizer->fmt_in );
238 /*****************************************************************************
239 * Close: frees unused data
240 *****************************************************************************/
241 static void Close( vlc_object_t * p_this )
243 input_thread_t *p_input = (input_thread_t*)p_this;
244 demux_sys_t *p_sys = p_input->p_demux_data;
247 module_Unneed( p_sys->p_packetizer, p_sys->p_packetizer->p_module );
249 /* Delete the decoder */
250 vlc_object_destroy( p_sys->p_packetizer );
255 /*****************************************************************************
256 * Demux: reads and demuxes data packets
257 *****************************************************************************
258 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
259 *****************************************************************************/
260 static int Demux( input_thread_t * p_input )
262 demux_sys_t *p_sys = p_input->p_demux_data;
263 block_t *p_block_in, *p_block_out;
265 if( !( p_block_in = stream_Block( p_input->s, DTS_PACKET_SIZE ) ) )
271 p_block_in->i_pts = p_block_in->i_dts = 1;
273 p_block_in->i_pts = p_block_in->i_dts = 0;
275 while( (p_block_out = p_sys->p_packetizer->pf_packetize(
276 p_sys->p_packetizer, &p_block_in )) )
278 p_sys->b_start = VLC_FALSE;
282 block_t *p_next = p_block_out->p_next;
284 /* We assume a constant bitrate */
285 if( p_block_out->i_length )
287 p_block_out->i_buffer * I64C(1000000) / p_block_out->i_length;
288 p_input->stream.i_mux_rate = p_sys->i_mux_rate / 50;
290 input_ClockManageRef( p_input,
291 p_input->stream.p_selected_program,
292 p_block_out->i_pts * 9 / 100 );
294 p_block_out->i_dts = p_block_out->i_pts =
295 input_ClockGetTS( p_input, p_input->stream.p_selected_program,
296 p_block_out->i_pts * 9 / 100 );
298 es_out_Send( p_input->p_es_out, p_sys->p_es, p_block_out );
300 p_block_out = p_next;
307 /*****************************************************************************
309 *****************************************************************************/
310 static int Control( input_thread_t *p_input, int i_query, va_list args )
312 demux_sys_t *p_sys = (demux_sys_t *)p_input->p_demux_data;
318 pi64 = (int64_t*)va_arg( args, int64_t * );
319 if( p_sys->i_mux_rate > 0 )
321 *pi64 = I64C(1000000) * stream_Tell( p_input->s ) /
328 case DEMUX_GET_LENGTH:
329 pi64 = (int64_t*)va_arg( args, int64_t * );
330 if( p_sys->i_mux_rate > 0 )
332 *pi64 = I64C(1000000) * stream_Size( p_input->s ) /
340 return demux_vaControlDefault( p_input, i_query, args );