1 /*****************************************************************************
2 * dts.c : raw DTS stream input module for vlc
3 *****************************************************************************
4 * Copyright (C) 2001 VideoLAN
5 * $Id: dts.c,v 1.11 2004/03/03 11:40:19 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 /*****************************************************************************
33 *****************************************************************************/
34 static int Open ( vlc_object_t * );
35 static void Close ( vlc_object_t * );
38 set_description( _("Raw DTS demuxer") );
39 set_capability( "demux2", 155 );
40 set_callbacks( Open, Close );
41 add_shortcut( "dts" );
44 /*****************************************************************************
46 *****************************************************************************/
47 static int Demux ( demux_t * );
48 static int Control( demux_t *, int, va_list );
56 decoder_t *p_packetizer;
61 static int CheckSync( uint8_t *p_peek );
63 #define DTS_PACKET_SIZE 16384
64 #define DTS_PROBE_SIZE (DTS_PACKET_SIZE * 4)
65 #define DTS_MAX_HEADER_SIZE 11
67 /*****************************************************************************
68 * Open: initializes ES structures
69 *****************************************************************************/
70 static int Open( vlc_object_t * p_this )
72 demux_t *p_demux = (demux_t*)p_this;
77 /* Check if we are dealing with a WAV file */
78 if( stream_Peek( p_demux->s, &p_peek, 20 ) == 20 &&
79 !strncmp( p_peek, "RIFF", 4 ) && !strncmp( &p_peek[8], "WAVE", 4 ) )
83 /* Find the wave format header */
85 while( strncmp( p_peek + i_peek - 8, "fmt ", 4 ) )
87 i_size = GetDWLE( p_peek + i_peek - 4 );
88 if( i_size + i_peek > DTS_PROBE_SIZE ) return VLC_EGENERIC;
91 if( stream_Peek( p_demux->s, &p_peek, i_peek ) != i_peek )
95 /* Sanity check the wave format header */
96 i_size = GetDWLE( p_peek + i_peek - 4 );
97 if( i_size + i_peek > DTS_PROBE_SIZE ) return VLC_EGENERIC;
99 if( stream_Peek( p_demux->s, &p_peek, i_peek ) != i_peek )
101 if( GetWLE( p_peek + i_peek - i_size - 8 /* wFormatTag */ ) !=
102 1 /* WAVE_FORMAT_PCM */ )
104 if( GetWLE( p_peek + i_peek - i_size - 6 /* nChannels */ ) != 2 )
106 if( GetDWLE( p_peek + i_peek - i_size - 4 /* nSamplesPerSec */ ) !=
110 /* Skip the wave header */
111 while( strncmp( p_peek + i_peek - 8, "data", 4 ) )
113 i_size = GetDWLE( p_peek + i_peek - 4 );
114 if( i_size + i_peek > DTS_PROBE_SIZE ) return VLC_EGENERIC;
115 i_peek += i_size + 8;
117 if( stream_Peek( p_demux->s, &p_peek, i_peek ) != i_peek )
121 /* Some DTS wav files don't begin with a sync code so we do a more
122 * extensive search */
123 i_size = stream_Peek( p_demux->s, &p_peek, DTS_PROBE_SIZE );
124 i_size -= DTS_MAX_HEADER_SIZE;
126 while( i_peek < i_size )
128 if( CheckSync( p_peek + i_peek ) != VLC_SUCCESS )
129 /* The data is stored in 16 bits words */
136 /* Have a peep at the show. */
137 if( stream_Peek( p_demux->s, &p_peek, i_peek + DTS_MAX_HEADER_SIZE * 2 ) <
138 i_peek + DTS_MAX_HEADER_SIZE * 2 )
140 /* Stream too short */
141 msg_Warn( p_demux, "cannot peek()" );
145 if( CheckSync( p_peek + i_peek ) != VLC_SUCCESS )
147 if( strncmp( p_demux->psz_demux, "dts", 3 ) )
152 msg_Err( p_demux, "this doesn't look like a DTS audio stream, "
153 "continuing anyway" );
156 p_demux->pf_demux = Demux;
157 p_demux->pf_control = Control;
158 p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
159 p_sys->b_start = VLC_TRUE;
160 p_sys->i_mux_rate = 0;
163 * Load the DTS packetizer
165 p_sys->p_packetizer = vlc_object_create( p_demux, VLC_OBJECT_DECODER );
166 p_sys->p_packetizer->pf_decode_audio = 0;
167 p_sys->p_packetizer->pf_decode_video = 0;
168 p_sys->p_packetizer->pf_decode_sub = 0;
169 p_sys->p_packetizer->pf_packetize = 0;
171 /* Initialization of decoder structure */
172 es_format_Init( &p_sys->p_packetizer->fmt_in, AUDIO_ES,
173 VLC_FOURCC( 'd', 't', 's', ' ' ) );
175 p_sys->p_packetizer->p_module =
176 module_Need( p_sys->p_packetizer, "packetizer", NULL );
177 if( !p_sys->p_packetizer->p_module )
179 msg_Err( p_demux, "cannot find DTS packetizer" );
183 p_sys->p_es = es_out_Add( p_demux->out, &p_sys->p_packetizer->fmt_in );
188 /*****************************************************************************
189 * Close: frees unused data
190 *****************************************************************************/
191 static void Close( vlc_object_t *p_this )
193 demux_t *p_demux = (demux_t*)p_this;
194 demux_sys_t *p_sys = p_demux->p_sys;
197 module_Unneed( p_sys->p_packetizer, p_sys->p_packetizer->p_module );
199 /* Delete the decoder */
200 vlc_object_destroy( p_sys->p_packetizer );
205 /*****************************************************************************
206 * Demux: reads and demuxes data packets
207 *****************************************************************************
208 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
209 *****************************************************************************/
210 static int Demux( demux_t *p_demux )
212 demux_sys_t *p_sys = p_demux->p_sys;
213 block_t *p_block_in, *p_block_out;
215 if( !( p_block_in = stream_Block( p_demux->s, DTS_PACKET_SIZE ) ) )
221 p_block_in->i_pts = p_block_in->i_dts = 1;
223 p_block_in->i_pts = p_block_in->i_dts = 0;
225 while( (p_block_out = p_sys->p_packetizer->pf_packetize(
226 p_sys->p_packetizer, &p_block_in )) )
228 p_sys->b_start = VLC_FALSE;
232 block_t *p_next = p_block_out->p_next;
234 /* We assume a constant bitrate */
235 if( p_block_out->i_length )
238 p_block_out->i_buffer * I64C(1000000) / p_block_out->i_length;
242 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block_out->i_dts );
244 es_out_Send( p_demux->out, p_sys->p_es, p_block_out );
246 p_block_out = p_next;
253 /*****************************************************************************
255 *****************************************************************************/
256 static int Control( demux_t *p_demux, int i_query, va_list args )
258 demux_sys_t *p_sys = p_demux->p_sys;
259 return demux2_vaControlHelper( p_demux->s,
261 8*p_sys->i_mux_rate, 1, i_query, args );
264 /*****************************************************************************
265 * CheckSync: Check if buffer starts with a DTS sync code
266 *****************************************************************************/
267 static int CheckSync( uint8_t *p_peek )
269 /* 14 bits, little endian version of the bitstream */
270 if( p_peek[0] == 0xff && p_peek[1] == 0x1f &&
271 p_peek[2] == 0x00 && p_peek[3] == 0xe8 &&
272 (p_peek[4] & 0xf0) == 0xf0 && p_peek[5] == 0x07 )
276 /* 14 bits, big endian version of the bitstream */
277 else if( p_peek[0] == 0x1f && p_peek[1] == 0xff &&
278 p_peek[2] == 0xe8 && p_peek[3] == 0x00 &&
279 p_peek[4] == 0x07 && (p_peek[5] & 0xf0) == 0xf0)
283 /* 16 bits, big endian version of the bitstream */
284 else if( p_peek[0] == 0x7f && p_peek[1] == 0xfe &&
285 p_peek[2] == 0x80 && p_peek[3] == 0x01 )
289 /* 16 bits, little endian version of the bitstream */
290 else if( p_peek[0] == 0xfe && p_peek[1] == 0x7f &&
291 p_peek[2] == 0x01 && p_peek[3] == 0x80 )