1 /*****************************************************************************
2 * rawdv.c : raw DV input module for vlc
3 *****************************************************************************
4 * Copyright (C) 2001-2007 the VideoLAN team
7 * Authors: Gildas Bazin <gbazin@netcourrier.com>
8 * Paul Corke <paul dot corke at datatote dot co dot uk>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
23 *****************************************************************************/
25 /*****************************************************************************
27 *****************************************************************************/
30 #include <vlc_demux.h>
32 /*****************************************************************************
34 *****************************************************************************/
35 #define HURRYUP_TEXT N_( "Hurry up" )
36 #define HURRYUP_LONGTEXT N_( "The demuxer will advance timestamps if the " \
37 "input can't keep up with the rate." )
39 static int Open ( vlc_object_t * );
40 static void Close( vlc_object_t * );
43 set_shortname( "DV" );
44 set_description( _("DV (Digital Video) demuxer") );
45 set_capability( "demux2", 2 );
46 set_category( CAT_INPUT );
47 set_subcategory( SUBCAT_INPUT_DEMUX );
48 add_bool( "rawdv-hurry-up", 0, NULL, HURRYUP_TEXT, HURRYUP_LONGTEXT, VLC_FALSE );
49 set_callbacks( Open, Close );
50 add_shortcut( "rawdv" );
54 /*****************************************************************************
55 A little bit of background information (copied over from libdv glossary).
57 - DIF block: A block of 80 bytes. This is the basic data framing unit of the
58 DVC tape format, analogous to sectors of hard disc.
60 - Video Section: Each DIF sequence contains a video section, consisting of
61 135 DIF blocks, which are further subdivided into Video Segments.
63 - Video Segment: A video segment consists of 5 DIF blocks, each corresponding
64 to a single compressed macroblock.
66 *****************************************************************************/
69 /*****************************************************************************
71 *****************************************************************************/
72 #define DV_PAL_FRAME_SIZE 144000
73 #define DV_NTSC_FRAME_SIZE 122000
75 /*****************************************************************************
76 * Definitions of structures used by this plugin
77 *****************************************************************************/
79 int8_t sct; /* Section type (header,subcode,aux,audio,video) */
80 int8_t dsn; /* DIF sequence number (0-12) */
81 int fsc; /* First (0)/Second channel (1) */
82 int8_t dbn; /* DIF block number (0-134) */
86 int dsf; /* DIF sequence flag: 525/60 (0) or 625,50 (1) */
100 es_out_id_t *p_es_video;
101 es_format_t fmt_video;
103 es_out_id_t *p_es_audio;
104 es_format_t fmt_audio;
110 /* program clock reference (in units of 90kHz) */
112 vlc_bool_t b_hurry_up;
115 /*****************************************************************************
117 *****************************************************************************/
118 static int Demux( demux_t * );
119 static int Control( demux_t *, int i_query, va_list args );
121 static block_t *dv_extract_audio( demux_t *p_demux,
122 block_t* p_frame_block );
124 /*****************************************************************************
125 * Open: initializes raw DV demux structures
126 *****************************************************************************/
127 static int Open( vlc_object_t * p_this )
129 demux_t *p_demux = (demux_t*)p_this;
132 const byte_t *p_peek, *p_peek_backup;
135 dv_header_t dv_header;
138 /* It isn't easy to recognize a raw DV stream. The chances that we'll
139 * mistake a stream from another type for a raw DV stream are too high, so
140 * we'll rely on the file extension to trigger this demux. Alternatively,
141 * it is possible to force this demux. */
143 /* Check for DV file extension */
144 if( !demux2_IsPathExtension( p_demux, ".dv" ) && !p_demux->b_force )
147 if( stream_Peek( p_demux->s, &p_peek, DV_PAL_FRAME_SIZE ) <
150 /* Stream too short ... */
151 msg_Err( p_demux, "cannot peek()" );
154 p_peek_backup = p_peek;
156 /* fill in the dv_id_t structure */
157 i_dword = GetDWBE( p_peek ); p_peek += 4;
158 dv_id.sct = i_dword >> (32 - 3);
160 dv_id.dsn = i_dword >> (32 - 4);
162 dv_id.fsc = i_dword >> (32 - 1);
164 dv_id.dbn = i_dword >> (32 - 8);
169 msg_Warn( p_demux, "not a raw DV stream header" );
173 /* fill in the dv_header_t structure */
174 dv_header.dsf = i_dword >> (32 - 1);
176 if( i_dword >> (32 - 1) ) /* incorrect bit */
178 msg_Warn( p_demux, "incorrect bit" );
182 i_dword = GetDWBE( p_peek ); p_peek += 4;
184 dv_header.apt = i_dword >> (32 - 3);
186 dv_header.tf1 = i_dword >> (32 - 1);
188 dv_header.ap1 = i_dword >> (32 - 3);
190 dv_header.tf2 = i_dword >> (32 - 1);
192 dv_header.ap2 = i_dword >> (32 - 3);
194 dv_header.tf3 = i_dword >> (32 - 1);
196 dv_header.ap3 = i_dword >> (32 - 3);
198 p_peek += 72; /* skip rest of DIF block */
200 /* Set p_input field */
201 p_demux->pf_demux = Demux;
202 p_demux->pf_control = Control;
203 p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
207 p_sys->b_hurry_up = var_CreateGetBool( p_demux, "rawdv-hurry-up" );
208 msg_Dbg( p_demux, "Realtime DV Source: %s", (p_sys->b_hurry_up)?"Yes":"No" );
210 p_sys->i_dsf = dv_header.dsf;
211 p_sys->frame_size = dv_header.dsf ? 12 * 150 * 80 : 10 * 150 * 80;
212 p_sys->f_rate = dv_header.dsf ? 25 : 29.97;
215 p_sys->p_es_video = NULL;
216 p_sys->p_es_audio = NULL;
218 p_sys->i_bitrate = 0;
220 es_format_Init( &p_sys->fmt_video, VIDEO_ES, VLC_FOURCC('d','v','s','d') );
221 p_sys->fmt_video.video.i_width = 720;
222 p_sys->fmt_video.video.i_height= dv_header.dsf ? 576 : 480;;
226 /* necessary because input_SplitBuffer() will only get
227 * INPUT_DEFAULT_BUFSIZE bytes at a time. */
228 p_input->i_bufsize = p_sys->frame_size;
231 p_sys->p_es_video = es_out_Add( p_demux->out, &p_sys->fmt_video );
234 p_peek = p_peek_backup + 80*6+80*16*3 + 3; /* beginning of AAUX pack */
235 if( *p_peek == 0x50 )
237 es_format_Init( &p_sys->fmt_audio, AUDIO_ES,
238 VLC_FOURCC('a','r','a','w') );
240 p_sys->fmt_audio.audio.i_channels = 2;
241 switch( (p_peek[4] >> 3) & 0x07 )
244 p_sys->fmt_audio.audio.i_rate = 48000;
247 p_sys->fmt_audio.audio.i_rate = 44100;
251 p_sys->fmt_audio.audio.i_rate = 32000;
255 /* 12 bits non-linear will be converted to 16 bits linear */
256 p_sys->fmt_audio.audio.i_bitspersample = 16;
258 p_sys->p_es_audio = es_out_Add( p_demux->out, &p_sys->fmt_audio );
264 /*****************************************************************************
265 * Close: frees unused data
266 *****************************************************************************/
267 static void Close( vlc_object_t *p_this )
269 demux_t *p_demux = (demux_t*)p_this;
270 demux_sys_t *p_sys = p_demux->p_sys;
272 var_Destroy( p_demux, "rawdv-hurry-up");
276 /*****************************************************************************
277 * Demux: reads and demuxes data packets
278 *****************************************************************************
279 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
280 *****************************************************************************/
281 static int Demux( demux_t *p_demux )
283 demux_sys_t *p_sys = p_demux->p_sys;
285 vlc_bool_t b_audio = VLC_FALSE;
287 if( p_sys->b_hurry_up )
290 p_sys->i_pcr = mdate() + (p_sys->i_dsf ? 120000 : 90000);
293 /* Call the pace control */
294 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_sys->i_pcr );
295 p_block = stream_Block( p_demux->s, p_sys->frame_size );
296 if( p_block == NULL )
302 if( p_sys->p_es_audio )
304 es_out_Control( p_demux->out, ES_OUT_GET_ES_STATE,
305 p_sys->p_es_audio, &b_audio );
309 p_block->i_pts = p_sys->i_pcr;
313 block_t *p_audio_block = dv_extract_audio( p_demux, p_block );
316 p_audio_block->i_pts =
317 p_audio_block->i_dts = p_sys->i_pcr;
318 es_out_Send( p_demux->out, p_sys->p_es_audio, p_audio_block );
322 es_out_Send( p_demux->out, p_sys->p_es_video, p_block );
324 if( !p_sys->b_hurry_up )
326 p_sys->i_pcr += ( I64C(1000000) / p_sys->f_rate );
332 /*****************************************************************************
334 *****************************************************************************/
335 static int Control( demux_t *p_demux, int i_query, va_list args )
337 demux_sys_t *p_sys = p_demux->p_sys;
339 /* XXX: DEMUX_SET_TIME is precise here */
340 return demux2_vaControlHelper( p_demux->s,
342 p_sys->frame_size * p_sys->f_rate * 8,
343 p_sys->frame_size, i_query, args );
346 static const uint16_t dv_audio_shuffle525[10][9] = {
347 { 0, 30, 60, 20, 50, 80, 10, 40, 70 }, /* 1st channel */
348 { 6, 36, 66, 26, 56, 86, 16, 46, 76 },
349 { 12, 42, 72, 2, 32, 62, 22, 52, 82 },
350 { 18, 48, 78, 8, 38, 68, 28, 58, 88 },
351 { 24, 54, 84, 14, 44, 74, 4, 34, 64 },
353 { 1, 31, 61, 21, 51, 81, 11, 41, 71 }, /* 2nd channel */
354 { 7, 37, 67, 27, 57, 87, 17, 47, 77 },
355 { 13, 43, 73, 3, 33, 63, 23, 53, 83 },
356 { 19, 49, 79, 9, 39, 69, 29, 59, 89 },
357 { 25, 55, 85, 15, 45, 75, 5, 35, 65 },
360 static const uint16_t dv_audio_shuffle625[12][9] = {
361 { 0, 36, 72, 26, 62, 98, 16, 52, 88}, /* 1st channel */
362 { 6, 42, 78, 32, 68, 104, 22, 58, 94},
363 { 12, 48, 84, 2, 38, 74, 28, 64, 100},
364 { 18, 54, 90, 8, 44, 80, 34, 70, 106},
365 { 24, 60, 96, 14, 50, 86, 4, 40, 76},
366 { 30, 66, 102, 20, 56, 92, 10, 46, 82},
368 { 1, 37, 73, 27, 63, 99, 17, 53, 89}, /* 2nd channel */
369 { 7, 43, 79, 33, 69, 105, 23, 59, 95},
370 { 13, 49, 85, 3, 39, 75, 29, 65, 101},
371 { 19, 55, 91, 9, 45, 81, 35, 71, 107},
372 { 25, 61, 97, 15, 51, 87, 5, 41, 77},
373 { 31, 67, 103, 21, 57, 93, 11, 47, 83},
376 static inline uint16_t dv_audio_12to16( uint16_t sample )
378 uint16_t shift, result;
380 sample = (sample < 0x800) ? sample : sample | 0xf000;
381 shift = (sample & 0xf00) >> 8;
383 if (shift < 0x2 || shift > 0xd) {
385 } else if (shift < 0x8) {
387 result = (sample - (256 * shift)) << shift;
390 result = ((sample + ((256 * shift) + 1)) << shift) - 1;
396 static block_t *dv_extract_audio( demux_t *p_demux,
397 block_t* p_frame_block )
399 demux_sys_t *p_sys = p_demux->p_sys;
401 uint8_t *p_frame, *p_buf;
402 int i_audio_quant, i_samples, i_size, i_half_ch;
403 const uint16_t (*audio_shuffle)[9];
407 /* Beginning of AAUX pack */
408 p_buf = p_frame_block->p_buffer + 80*6+80*16*3 + 3;
409 if( *p_buf != 0x50 ) return NULL;
411 i_audio_quant = p_buf[4] & 0x07; /* 0 - 16bit, 1 - 12bit */
412 if( i_audio_quant > 1 )
414 msg_Dbg( p_demux, "unsupported quantization for DV audio");
418 i_samples = p_buf[1] & 0x3f; /* samples in this frame - min samples */
419 switch( (p_buf[4] >> 3) & 0x07 )
422 i_size = p_sys->i_dsf ? 1896 : 1580;
425 i_size = p_sys->i_dsf ? 1742 : 1452;
429 i_size = p_sys->i_dsf ? 1264 : 1053;
432 i_size = (i_size + i_samples) * 4; /* 2ch, 2bytes */
434 p_block = block_New( p_demux, i_size );
436 /* for each DIF segment */
437 p_frame = p_frame_block->p_buffer;
438 audio_shuffle = p_sys->i_dsf ? dv_audio_shuffle625 : dv_audio_shuffle525;
439 i_half_ch = (p_sys->i_dsf ? 12 : 10)/2;
440 for( i = 0; i < (p_sys->i_dsf ? 12 : 10); i++ )
442 p_frame += 6 * 80; /* skip DIF segment header */
444 if( i_audio_quant == 1 && i == i_half_ch ) break;
446 for( j = 0; j < 9; j++ )
448 for( d = 8; d < 80; d += 2 )
450 if( i_audio_quant == 0 )
452 /* 16bit quantization */
453 of = audio_shuffle[i][j] + (d - 8) / 2 *
454 (p_sys->i_dsf ? 108 : 90);
456 if( of * 2 >= i_size ) continue;
459 p_block->p_buffer[of*2] = p_frame[d+1];
460 p_block->p_buffer[of*2+1] = p_frame[d];
462 if( p_block->p_buffer[of*2+1] == 0x80 &&
463 p_block->p_buffer[of*2] == 0x00 )
464 p_block->p_buffer[of*2+1] = 0;
468 /* 12bit quantization */
469 lc = ((uint16_t)p_frame[d] << 4) |
470 ((uint16_t)p_frame[d+2] >> 4);
471 lc = (lc == 0x800 ? 0 : dv_audio_12to16(lc));
473 of = audio_shuffle[i][j] + (d - 8) / 3 *
474 (p_sys->i_dsf ? 108 : 90);
475 if( of*2 >= i_size ) continue;
478 p_block->p_buffer[of*2] = lc & 0xff;
479 p_block->p_buffer[of*2+1] = lc >> 8;
484 p_frame += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */