1 /*****************************************************************************
2 * dts.c : raw DTS stream input module for vlc
3 *****************************************************************************
4 * Copyright (C) 2001 VideoLAN
5 * $Id: dts.c,v 1.4 2004/02/04 08:11:49 gbazin 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_MAX_HEADER_SIZE 11
34 /*****************************************************************************
36 *****************************************************************************/
37 static int Open ( vlc_object_t * );
38 static void Close ( vlc_object_t * );
39 static int Demux ( input_thread_t * );
47 decoder_t *p_packetizer;
50 /*****************************************************************************
52 *****************************************************************************/
54 set_description( _("Raw DTS demuxer") );
55 set_capability( "demux", 155 );
56 set_callbacks( Open, Close );
57 add_shortcut( "dts" );
60 /*****************************************************************************
61 * CheckSync: Check if buffer starts with a DTS sync code
62 *****************************************************************************/
63 int CheckSync( uint8_t *p_peek )
65 /* 14 bits, little endian version of the bitstream */
66 if( p_peek[0] == 0xff && p_peek[1] == 0x1f &&
67 p_peek[2] == 0x00 && p_peek[3] == 0xe8 &&
68 (p_peek[4] & 0xf0) == 0xf0 && p_peek[5] == 0x07 )
72 /* 14 bits, big endian version of the bitstream */
73 else if( p_peek[0] == 0x1f && p_peek[1] == 0xff &&
74 p_peek[2] == 0xe8 && p_peek[3] == 0x00 &&
75 p_peek[4] == 0x07 && (p_peek[5] & 0xf0) == 0xf0)
79 /* 16 bits, big endian version of the bitstream */
80 else if( p_peek[0] == 0x7f && p_peek[1] == 0xfe &&
81 p_peek[2] == 0x80 && p_peek[3] == 0x01 )
85 /* 16 bits, little endian version of the bitstream */
86 else if( p_peek[0] == 0xfe && p_peek[1] == 0x7f &&
87 p_peek[2] == 0x01 && p_peek[3] == 0x80 )
95 /*****************************************************************************
96 * Open: initializes ES structures
97 *****************************************************************************/
98 static int Open( vlc_object_t * p_this )
100 input_thread_t *p_input = (input_thread_t *)p_this;
105 p_input->pf_demux = Demux;
106 p_input->pf_demux_control = demux_vaControlDefault;
107 p_input->pf_rewind = NULL;
109 /* Check if we are dealing with a WAV file */
110 if( input_Peek( p_input, &p_peek, 12 ) == 12 &&
111 !strncmp( p_peek, "RIFF", 4 ) && !strncmp( &p_peek[8], "WAVE", 4 ) )
113 /* Skip the wave header */
115 while( input_Peek( p_input, &p_peek, i_peek ) == i_peek &&
116 strncmp( p_peek + i_peek - 8, "data", 4 ) )
118 i_peek += GetDWLE( p_peek + i_peek - 4 ) + 8;
121 /* TODO: should check wave format and sample_rate */
123 /* Some DTS wav files don't begin with a sync code so we do a more
124 * extensive search */
125 if( input_Peek( p_input, &p_peek, i_peek + DTS_PACKET_SIZE ) ==
126 i_peek + DTS_PACKET_SIZE )
128 int i_size = i_peek + DTS_PACKET_SIZE - DTS_MAX_HEADER_SIZE;
130 while( i_peek < i_size )
132 if( CheckSync( p_peek + i_peek ) != VLC_SUCCESS )
133 /* The data is stored in 16 bits words */
141 /* Have a peep at the show. */
142 if( input_Peek( p_input, &p_peek, i_peek + DTS_MAX_HEADER_SIZE ) <
143 i_peek + DTS_MAX_HEADER_SIZE )
145 /* Stream too short */
146 msg_Err( p_input, "cannot peek()" );
150 if( CheckSync( p_peek + i_peek ) != VLC_SUCCESS )
152 if( p_input->psz_demux && !strncmp( p_input->psz_demux, "dts", 3 ) )
155 msg_Err( p_input, "this doesn't look like a DTS audio stream, "
156 "continuing anyway" );
164 p_input->p_demux_data = p_sys = malloc( sizeof( demux_sys_t ) );
165 p_sys->b_start = VLC_TRUE;
168 * Load the DTS packetizer
170 p_sys->p_packetizer = vlc_object_create( p_input, VLC_OBJECT_DECODER );
171 p_sys->p_packetizer->pf_decode_audio = 0;
172 p_sys->p_packetizer->pf_decode_video = 0;
173 p_sys->p_packetizer->pf_decode_sub = 0;
174 p_sys->p_packetizer->pf_packetize = 0;
176 /* Initialization of decoder structure */
177 es_format_Init( &p_sys->p_packetizer->fmt_in, AUDIO_ES,
178 VLC_FOURCC( 'd', 't', 's', ' ' ) );
180 p_sys->p_packetizer->p_module =
181 module_Need( p_sys->p_packetizer, "packetizer", NULL );
182 if( !p_sys->p_packetizer->p_module )
184 msg_Err( p_input, "cannot find DTS packetizer" );
188 /* Create one program */
189 vlc_mutex_lock( &p_input->stream.stream_lock );
190 if( input_InitStream( p_input, 0 ) == -1 )
192 vlc_mutex_unlock( &p_input->stream.stream_lock );
193 msg_Err( p_input, "cannot init stream" );
196 p_input->stream.i_mux_rate = 0;
197 vlc_mutex_unlock( &p_input->stream.stream_lock );
200 es_out_Add( p_input->p_es_out, &p_sys->p_packetizer->fmt_in );
205 /*****************************************************************************
206 * Close: frees unused data
207 *****************************************************************************/
208 static void Close( vlc_object_t * p_this )
210 input_thread_t *p_input = (input_thread_t*)p_this;
211 demux_sys_t *p_sys = p_input->p_demux_data;
214 module_Unneed( p_sys->p_packetizer, p_sys->p_packetizer->p_module );
216 /* Delete the decoder */
217 vlc_object_destroy( p_sys->p_packetizer );
222 /*****************************************************************************
223 * Demux: reads and demuxes data packets
224 *****************************************************************************
225 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
226 *****************************************************************************/
227 static int Demux( input_thread_t * p_input )
229 demux_sys_t *p_sys = p_input->p_demux_data;
230 block_t *p_block_in, *p_block_out;
232 if( !( p_block_in = stream_Block( p_input->s, DTS_PACKET_SIZE ) ) )
239 p_block_in->i_pts = p_block_in->i_dts = 1;
240 p_sys->b_start = VLC_FALSE;
244 p_block_in->i_pts = p_block_in->i_dts = 0;
247 while( (p_block_out = p_sys->p_packetizer->pf_packetize(
248 p_sys->p_packetizer, &p_block_in )) )
252 block_t *p_next = p_block_out->p_next;
254 input_ClockManageRef( p_input,
255 p_input->stream.p_selected_program,
256 p_block_out->i_pts * 9 / 100 );
258 p_block_in->b_discontinuity = 0;
259 p_block_out->i_dts = p_block_out->i_pts =
260 input_ClockGetTS( p_input, p_input->stream.p_selected_program,
261 p_block_out->i_pts * 9 / 100 );
263 es_out_Send( p_input->p_es_out, p_sys->p_es, p_block_out );
265 p_block_out = p_next;