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 *****************************************************************************/
33 #include <vlc_common.h>
34 #include <vlc_plugin.h>
35 #include <vlc_demux.h>
37 /*****************************************************************************
39 *****************************************************************************/
40 #define HURRYUP_TEXT N_( "Hurry up" )
41 #define HURRYUP_LONGTEXT N_( "The demuxer will advance timestamps if the " \
42 "input can't keep up with the rate." )
44 static int Open ( vlc_object_t * );
45 static void Close( vlc_object_t * );
49 set_description( N_("DV (Digital Video) demuxer") )
50 set_capability( "demux", 3 )
51 set_category( CAT_INPUT )
52 set_subcategory( SUBCAT_INPUT_DEMUX )
53 add_bool( "rawdv-hurry-up", 0, NULL, HURRYUP_TEXT, HURRYUP_LONGTEXT, false )
54 set_callbacks( Open, Close )
55 add_shortcut( "rawdv" )
59 /*****************************************************************************
60 A little bit of background information (copied over from libdv glossary).
62 - DIF block: A block of 80 bytes. This is the basic data framing unit of the
63 DVC tape format, analogous to sectors of hard disc.
65 - Video Section: Each DIF sequence contains a video section, consisting of
66 135 DIF blocks, which are further subdivided into Video Segments.
68 - Video Segment: A video segment consists of 5 DIF blocks, each corresponding
69 to a single compressed macroblock.
71 *****************************************************************************/
74 /*****************************************************************************
76 *****************************************************************************/
77 #define DV_PAL_FRAME_SIZE 144000
78 #define DV_NTSC_FRAME_SIZE 122000
80 /*****************************************************************************
81 * Definitions of structures used by this plugin
82 *****************************************************************************/
84 int8_t sct; /* Section type (header,subcode,aux,audio,video) */
85 int8_t dsn; /* DIF sequence number (0-12) */
86 int fsc; /* First (0)/Second channel (1) */
87 int8_t dbn; /* DIF block number (0-134) */
91 int dsf; /* DIF sequence flag: 525/60 (0) or 625,50 (1) */
105 es_out_id_t *p_es_video;
106 es_format_t fmt_video;
108 es_out_id_t *p_es_audio;
109 es_format_t fmt_audio;
115 /* program clock reference (in units of 90kHz) */
120 /*****************************************************************************
122 *****************************************************************************/
123 static int Demux( demux_t * );
124 static int Control( demux_t *, int i_query, va_list args );
126 static block_t *dv_extract_audio( demux_t *p_demux,
127 block_t* p_frame_block );
129 /*****************************************************************************
130 * Open: initializes raw DV demux structures
131 *****************************************************************************/
132 static int Open( vlc_object_t * p_this )
134 demux_t *p_demux = (demux_t*)p_this;
137 const uint8_t *p_peek, *p_peek_backup;
140 dv_header_t dv_header;
143 /* It isn't easy to recognize a raw DV stream. The chances that we'll
144 * mistake a stream from another type for a raw DV stream are too high, so
145 * we'll rely on the file extension to trigger this demux. Alternatively,
146 * it is possible to force this demux. */
148 /* Check for DV file extension */
149 if( !demux_IsPathExtension( p_demux, ".dv" ) && !p_demux->b_force )
152 if( stream_Peek( p_demux->s, &p_peek, DV_PAL_FRAME_SIZE ) <
155 /* Stream too short ... */
156 msg_Err( p_demux, "cannot peek()" );
159 p_peek_backup = p_peek;
161 /* fill in the dv_id_t structure */
162 i_dword = GetDWBE( p_peek ); p_peek += 4;
163 dv_id.sct = i_dword >> (32 - 3);
165 dv_id.dsn = i_dword >> (32 - 4);
167 dv_id.fsc = i_dword >> (32 - 1);
169 dv_id.dbn = i_dword >> (32 - 8);
174 msg_Warn( p_demux, "not a raw DV stream header" );
178 /* fill in the dv_header_t structure */
179 dv_header.dsf = i_dword >> (32 - 1);
181 if( i_dword >> (32 - 1) ) /* incorrect bit */
183 msg_Warn( p_demux, "incorrect bit" );
187 i_dword = GetDWBE( p_peek ); p_peek += 4;
189 dv_header.apt = i_dword >> (32 - 3);
191 dv_header.tf1 = i_dword >> (32 - 1);
193 dv_header.ap1 = i_dword >> (32 - 3);
195 dv_header.tf2 = i_dword >> (32 - 1);
197 dv_header.ap2 = i_dword >> (32 - 3);
199 dv_header.tf3 = i_dword >> (32 - 1);
201 dv_header.ap3 = i_dword >> (32 - 3);
203 p_peek += 72; /* skip rest of DIF block */
205 /* Set p_input field */
206 p_demux->pf_demux = Demux;
207 p_demux->pf_control = Control;
208 p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
212 p_sys->b_hurry_up = var_CreateGetBool( p_demux, "rawdv-hurry-up" );
213 msg_Dbg( p_demux, "Realtime DV Source: %s", (p_sys->b_hurry_up)?"Yes":"No" );
215 p_sys->i_dsf = dv_header.dsf;
216 p_sys->frame_size = dv_header.dsf ? 12 * 150 * 80 : 10 * 150 * 80;
217 p_sys->f_rate = dv_header.dsf ? 25 : 29.97;
220 p_sys->p_es_video = NULL;
221 p_sys->p_es_audio = NULL;
223 p_sys->i_bitrate = 0;
225 es_format_Init( &p_sys->fmt_video, VIDEO_ES, VLC_FOURCC('d','v','s','d') );
226 p_sys->fmt_video.video.i_width = 720;
227 p_sys->fmt_video.video.i_height= dv_header.dsf ? 576 : 480;;
231 /* necessary because input_SplitBuffer() will only get
232 * INPUT_DEFAULT_BUFSIZE bytes at a time. */
233 p_input->i_bufsize = p_sys->frame_size;
236 p_sys->p_es_video = es_out_Add( p_demux->out, &p_sys->fmt_video );
239 p_peek = p_peek_backup + 80*6+80*16*3 + 3; /* beginning of AAUX pack */
240 if( *p_peek == 0x50 )
242 es_format_Init( &p_sys->fmt_audio, AUDIO_ES,
243 VLC_FOURCC('a','r','a','w') );
245 p_sys->fmt_audio.audio.i_channels = 2;
246 switch( (p_peek[4] >> 3) & 0x07 )
249 p_sys->fmt_audio.audio.i_rate = 48000;
252 p_sys->fmt_audio.audio.i_rate = 44100;
256 p_sys->fmt_audio.audio.i_rate = 32000;
260 /* 12 bits non-linear will be converted to 16 bits linear */
261 p_sys->fmt_audio.audio.i_bitspersample = 16;
263 p_sys->p_es_audio = es_out_Add( p_demux->out, &p_sys->fmt_audio );
269 /*****************************************************************************
270 * Close: frees unused data
271 *****************************************************************************/
272 static void Close( vlc_object_t *p_this )
274 demux_t *p_demux = (demux_t*)p_this;
275 demux_sys_t *p_sys = p_demux->p_sys;
277 var_Destroy( p_demux, "rawdv-hurry-up");
281 /*****************************************************************************
282 * Demux: reads and demuxes data packets
283 *****************************************************************************
284 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
285 *****************************************************************************/
286 static int Demux( demux_t *p_demux )
288 demux_sys_t *p_sys = p_demux->p_sys;
290 bool b_audio = false;
292 if( p_sys->b_hurry_up )
295 p_sys->i_pcr = mdate() + (p_sys->i_dsf ? 120000 : 90000);
298 /* Call the pace control */
299 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_sys->i_pcr );
300 p_block = stream_Block( p_demux->s, p_sys->frame_size );
301 if( p_block == NULL )
307 if( p_sys->p_es_audio )
309 es_out_Control( p_demux->out, ES_OUT_GET_ES_STATE,
310 p_sys->p_es_audio, &b_audio );
314 p_block->i_pts = p_sys->i_pcr;
318 block_t *p_audio_block = dv_extract_audio( p_demux, p_block );
321 p_audio_block->i_pts =
322 p_audio_block->i_dts = p_sys->i_pcr;
323 es_out_Send( p_demux->out, p_sys->p_es_audio, p_audio_block );
327 es_out_Send( p_demux->out, p_sys->p_es_video, p_block );
329 if( !p_sys->b_hurry_up )
331 p_sys->i_pcr += ( INT64_C(1000000) / p_sys->f_rate );
337 /*****************************************************************************
339 *****************************************************************************/
340 static int Control( demux_t *p_demux, int i_query, va_list args )
342 demux_sys_t *p_sys = p_demux->p_sys;
344 /* XXX: DEMUX_SET_TIME is precise here */
345 return demux_vaControlHelper( p_demux->s,
347 p_sys->frame_size * p_sys->f_rate * 8,
348 p_sys->frame_size, i_query, args );
351 static const uint16_t dv_audio_shuffle525[10][9] = {
352 { 0, 30, 60, 20, 50, 80, 10, 40, 70 }, /* 1st channel */
353 { 6, 36, 66, 26, 56, 86, 16, 46, 76 },
354 { 12, 42, 72, 2, 32, 62, 22, 52, 82 },
355 { 18, 48, 78, 8, 38, 68, 28, 58, 88 },
356 { 24, 54, 84, 14, 44, 74, 4, 34, 64 },
358 { 1, 31, 61, 21, 51, 81, 11, 41, 71 }, /* 2nd channel */
359 { 7, 37, 67, 27, 57, 87, 17, 47, 77 },
360 { 13, 43, 73, 3, 33, 63, 23, 53, 83 },
361 { 19, 49, 79, 9, 39, 69, 29, 59, 89 },
362 { 25, 55, 85, 15, 45, 75, 5, 35, 65 },
365 static const uint16_t dv_audio_shuffle625[12][9] = {
366 { 0, 36, 72, 26, 62, 98, 16, 52, 88}, /* 1st channel */
367 { 6, 42, 78, 32, 68, 104, 22, 58, 94},
368 { 12, 48, 84, 2, 38, 74, 28, 64, 100},
369 { 18, 54, 90, 8, 44, 80, 34, 70, 106},
370 { 24, 60, 96, 14, 50, 86, 4, 40, 76},
371 { 30, 66, 102, 20, 56, 92, 10, 46, 82},
373 { 1, 37, 73, 27, 63, 99, 17, 53, 89}, /* 2nd channel */
374 { 7, 43, 79, 33, 69, 105, 23, 59, 95},
375 { 13, 49, 85, 3, 39, 75, 29, 65, 101},
376 { 19, 55, 91, 9, 45, 81, 35, 71, 107},
377 { 25, 61, 97, 15, 51, 87, 5, 41, 77},
378 { 31, 67, 103, 21, 57, 93, 11, 47, 83},
381 static inline uint16_t dv_audio_12to16( uint16_t sample )
383 uint16_t shift, result;
385 sample = (sample < 0x800) ? sample : sample | 0xf000;
386 shift = (sample & 0xf00) >> 8;
388 if (shift < 0x2 || shift > 0xd) {
390 } else if (shift < 0x8) {
392 result = (sample - (256 * shift)) << shift;
395 result = ((sample + ((256 * shift) + 1)) << shift) - 1;
401 static block_t *dv_extract_audio( demux_t *p_demux,
402 block_t* p_frame_block )
404 demux_sys_t *p_sys = p_demux->p_sys;
406 uint8_t *p_frame, *p_buf;
407 int i_audio_quant, i_samples, i_size, i_half_ch;
408 const uint16_t (*audio_shuffle)[9];
412 /* Beginning of AAUX pack */
413 p_buf = p_frame_block->p_buffer + 80*6+80*16*3 + 3;
414 if( *p_buf != 0x50 ) return NULL;
416 i_audio_quant = p_buf[4] & 0x07; /* 0 - 16bit, 1 - 12bit */
417 if( i_audio_quant > 1 )
419 msg_Dbg( p_demux, "unsupported quantization for DV audio");
423 i_samples = p_buf[1] & 0x3f; /* samples in this frame - min samples */
424 switch( (p_buf[4] >> 3) & 0x07 )
427 i_size = p_sys->i_dsf ? 1896 : 1580;
430 i_size = p_sys->i_dsf ? 1742 : 1452;
434 i_size = p_sys->i_dsf ? 1264 : 1053;
437 i_size = (i_size + i_samples) * 4; /* 2ch, 2bytes */
439 p_block = block_New( p_demux, i_size );
441 /* for each DIF segment */
442 p_frame = p_frame_block->p_buffer;
443 audio_shuffle = p_sys->i_dsf ? dv_audio_shuffle625 : dv_audio_shuffle525;
444 i_half_ch = (p_sys->i_dsf ? 12 : 10)/2;
445 for( i = 0; i < (p_sys->i_dsf ? 12 : 10); i++ )
447 p_frame += 6 * 80; /* skip DIF segment header */
449 if( i_audio_quant == 1 && i == i_half_ch ) break;
451 for( j = 0; j < 9; j++ )
453 for( d = 8; d < 80; d += 2 )
455 if( i_audio_quant == 0 )
457 /* 16bit quantization */
458 of = audio_shuffle[i][j] + (d - 8) / 2 *
459 (p_sys->i_dsf ? 108 : 90);
461 if( of * 2 >= i_size ) continue;
464 p_block->p_buffer[of*2] = p_frame[d+1];
465 p_block->p_buffer[of*2+1] = p_frame[d];
467 if( p_block->p_buffer[of*2+1] == 0x80 &&
468 p_block->p_buffer[of*2] == 0x00 )
469 p_block->p_buffer[of*2+1] = 0;
473 /* 12bit quantization */
474 lc = ((uint16_t)p_frame[d] << 4) |
475 ((uint16_t)p_frame[d+2] >> 4);
476 lc = (lc == 0x800 ? 0 : dv_audio_12to16(lc));
478 of = audio_shuffle[i][j] + (d - 8) / 3 *
479 (p_sys->i_dsf ? 108 : 90);
480 if( of*2 >= i_size ) continue;
483 p_block->p_buffer[of*2] = lc & 0xff;
484 p_block->p_buffer[of*2+1] = lc >> 8;
489 p_frame += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */