1 /*****************************************************************************
2 * dts.c : raw DTS stream input module for vlc
3 *****************************************************************************
4 * Copyright (C) 2001 VideoLAN
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_category( CAT_INPUT );
39 set_subcategory( SUBCAT_INPUT_DEMUX );
40 set_description( _("Raw DTS demuxer") );
41 set_capability( "demux2", 155 );
42 set_callbacks( Open, Close );
43 add_shortcut( "dts" );
46 /*****************************************************************************
48 *****************************************************************************/
49 static int Demux ( demux_t * );
50 static int Control( demux_t *, int, va_list );
58 decoder_t *p_packetizer;
63 static int CheckSync( uint8_t *p_peek );
65 #define DTS_PACKET_SIZE 16384
66 #define DTS_PROBE_SIZE (DTS_PACKET_SIZE * 4)
67 #define DTS_MAX_HEADER_SIZE 11
69 /*****************************************************************************
70 * Open: initializes ES structures
71 *****************************************************************************/
72 static int Open( vlc_object_t * p_this )
74 demux_t *p_demux = (demux_t*)p_this;
79 /* Check if we are dealing with a WAV file */
80 if( stream_Peek( p_demux->s, &p_peek, 20 ) == 20 &&
81 !strncmp( p_peek, "RIFF", 4 ) && !strncmp( &p_peek[8], "WAVE", 4 ) )
85 /* Find the wave format header */
87 while( strncmp( p_peek + i_peek - 8, "fmt ", 4 ) )
89 i_size = GetDWLE( p_peek + i_peek - 4 );
90 if( i_size + i_peek > DTS_PROBE_SIZE ) return VLC_EGENERIC;
93 if( stream_Peek( p_demux->s, &p_peek, i_peek ) != i_peek )
97 /* Sanity check the wave format header */
98 i_size = GetDWLE( p_peek + i_peek - 4 );
99 if( i_size + i_peek > DTS_PROBE_SIZE ) return VLC_EGENERIC;
100 i_peek += i_size + 8;
101 if( stream_Peek( p_demux->s, &p_peek, i_peek ) != i_peek )
103 if( GetWLE( p_peek + i_peek - i_size - 8 /* wFormatTag */ ) !=
104 1 /* WAVE_FORMAT_PCM */ )
106 if( GetWLE( p_peek + i_peek - i_size - 6 /* nChannels */ ) != 2 )
108 if( GetDWLE( p_peek + i_peek - i_size - 4 /* nSamplesPerSec */ ) !=
112 /* Skip the wave header */
113 while( strncmp( p_peek + i_peek - 8, "data", 4 ) )
115 i_size = GetDWLE( p_peek + i_peek - 4 );
116 if( i_size + i_peek > DTS_PROBE_SIZE ) return VLC_EGENERIC;
117 i_peek += i_size + 8;
119 if( stream_Peek( p_demux->s, &p_peek, i_peek ) != i_peek )
123 /* Some DTS wav files don't begin with a sync code so we do a more
124 * extensive search */
125 i_size = stream_Peek( p_demux->s, &p_peek, DTS_PROBE_SIZE );
126 i_size -= DTS_MAX_HEADER_SIZE;
128 while( i_peek < i_size )
130 if( CheckSync( p_peek + i_peek ) != VLC_SUCCESS )
131 /* The data is stored in 16 bits words */
138 /* Have a peep at the show. */
139 if( stream_Peek( p_demux->s, &p_peek, i_peek + DTS_MAX_HEADER_SIZE * 2 ) <
140 i_peek + DTS_MAX_HEADER_SIZE * 2 )
142 /* Stream too short */
143 msg_Warn( p_demux, "cannot peek()" );
147 if( CheckSync( p_peek + i_peek ) != VLC_SUCCESS )
149 if( strncmp( p_demux->psz_demux, "dts", 3 ) )
154 msg_Err( p_demux, "this doesn't look like a DTS audio stream, "
155 "continuing anyway" );
158 p_demux->pf_demux = Demux;
159 p_demux->pf_control = Control;
160 p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
161 p_sys->b_start = VLC_TRUE;
162 p_sys->i_mux_rate = 0;
165 * Load the DTS packetizer
167 p_sys->p_packetizer = vlc_object_create( p_demux, VLC_OBJECT_DECODER );
168 p_sys->p_packetizer->pf_decode_audio = 0;
169 p_sys->p_packetizer->pf_decode_video = 0;
170 p_sys->p_packetizer->pf_decode_sub = 0;
171 p_sys->p_packetizer->pf_packetize = 0;
173 /* Initialization of decoder structure */
174 es_format_Init( &p_sys->p_packetizer->fmt_in, AUDIO_ES,
175 VLC_FOURCC( 'd', 't', 's', ' ' ) );
177 p_sys->p_packetizer->p_module =
178 module_Need( p_sys->p_packetizer, "packetizer", NULL, 0 );
179 if( !p_sys->p_packetizer->p_module )
181 msg_Err( p_demux, "cannot find DTS packetizer" );
185 p_sys->p_es = es_out_Add( p_demux->out, &p_sys->p_packetizer->fmt_in );
190 /*****************************************************************************
191 * Close: frees unused data
192 *****************************************************************************/
193 static void Close( vlc_object_t *p_this )
195 demux_t *p_demux = (demux_t*)p_this;
196 demux_sys_t *p_sys = p_demux->p_sys;
199 module_Unneed( p_sys->p_packetizer, p_sys->p_packetizer->p_module );
201 /* Delete the decoder */
202 vlc_object_destroy( p_sys->p_packetizer );
207 /*****************************************************************************
208 * Demux: reads and demuxes data packets
209 *****************************************************************************
210 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
211 *****************************************************************************/
212 static int Demux( demux_t *p_demux )
214 demux_sys_t *p_sys = p_demux->p_sys;
215 block_t *p_block_in, *p_block_out;
217 if( !( p_block_in = stream_Block( p_demux->s, DTS_PACKET_SIZE ) ) )
223 p_block_in->i_pts = p_block_in->i_dts = 1;
225 p_block_in->i_pts = p_block_in->i_dts = 0;
227 while( (p_block_out = p_sys->p_packetizer->pf_packetize(
228 p_sys->p_packetizer, &p_block_in )) )
230 p_sys->b_start = VLC_FALSE;
234 block_t *p_next = p_block_out->p_next;
236 /* We assume a constant bitrate */
237 if( p_block_out->i_length )
240 p_block_out->i_buffer * I64C(1000000) / p_block_out->i_length;
244 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block_out->i_dts );
246 es_out_Send( p_demux->out, p_sys->p_es, p_block_out );
248 p_block_out = p_next;
255 /*****************************************************************************
257 *****************************************************************************/
258 static int Control( demux_t *p_demux, int i_query, va_list args )
260 demux_sys_t *p_sys = p_demux->p_sys;
261 if( i_query == DEMUX_SET_TIME )
264 return demux2_vaControlHelper( p_demux->s,
266 8*p_sys->i_mux_rate, 1, i_query, args );
269 /*****************************************************************************
270 * CheckSync: Check if buffer starts with a DTS sync code
271 *****************************************************************************/
272 static int CheckSync( uint8_t *p_peek )
274 /* 14 bits, little endian version of the bitstream */
275 if( p_peek[0] == 0xff && p_peek[1] == 0x1f &&
276 p_peek[2] == 0x00 && p_peek[3] == 0xe8 &&
277 (p_peek[4] & 0xf0) == 0xf0 && p_peek[5] == 0x07 )
281 /* 14 bits, big endian version of the bitstream */
282 else if( p_peek[0] == 0x1f && p_peek[1] == 0xff &&
283 p_peek[2] == 0xe8 && p_peek[3] == 0x00 &&
284 p_peek[4] == 0x07 && (p_peek[5] & 0xf0) == 0xf0)
288 /* 16 bits, big endian version of the bitstream */
289 else if( p_peek[0] == 0x7f && p_peek[1] == 0xfe &&
290 p_peek[2] == 0x80 && p_peek[3] == 0x01 )
294 /* 16 bits, little endian version of the bitstream */
295 else if( p_peek[0] == 0xfe && p_peek[1] == 0x7f &&
296 p_peek[2] == 0x01 && p_peek[3] == 0x80 )