1 /*****************************************************************************
2 * rawdv.c : raw dv input module for vlc
3 *****************************************************************************
4 * Copyright (C) 2001-2003 VideoLAN
5 * $Id: rawdv.c,v 1.15 2004/02/29 19:01:22 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 *****************************************************************************/
27 #include <stdlib.h> /* malloc(), free() */
30 #include <vlc/input.h>
32 /*****************************************************************************
34 *****************************************************************************/
35 static int Open ( vlc_object_t * );
36 static void Close( vlc_object_t * );
38 static block_t *dv_extract_audio( input_thread_t * p_input,
39 block_t* p_frame_block );
42 set_description( _("raw dv demuxer") );
43 set_capability( "demux", 2 );
44 set_callbacks( Open, Close );
45 add_shortcut( "rawdv" );
49 /*****************************************************************************
50 A little bit of background information (copied over from libdv glossary).
52 - DIF block: A block of 80 bytes. This is the basic data framing unit of the
53 DVC tape format, analogous to sectors of hard disc.
55 - Video Section: Each DIF sequence contains a video section, consisting of
56 135 DIF blocks, which are further subdivided into Video Segments.
58 - Video Segment: A video segment consists of 5 DIF blocks, each corresponding
59 to a single compressed macroblock.
61 *****************************************************************************/
64 /*****************************************************************************
66 *****************************************************************************/
67 #define DV_PAL_FRAME_SIZE 144000
68 #define DV_NTSC_FRAME_SIZE 122000
70 /*****************************************************************************
71 * Definitions of structures used by this plugin
72 *****************************************************************************/
74 int8_t sct; /* Section type (header,subcode,aux,audio,video) */
75 int8_t dsn; /* DIF sequence number (0-12) */
76 int fsc; /* First (0)/Second channel (1) */
77 int8_t dbn; /* DIF block number (0-134) */
81 int dsf; /* DIF sequence flag: 525/60 (0) or 625,50 (1) */
95 es_out_id_t *p_es_video;
96 es_format_t fmt_video;
98 es_out_id_t *p_es_audio;
99 es_format_t fmt_audio;
105 /* program clock reference (in units of 90kHz) */
109 /*****************************************************************************
111 *****************************************************************************/
112 static int Demux ( input_thread_t * );
114 /*****************************************************************************
115 * Open: initializes raw dv demux structures
116 *****************************************************************************/
117 static int Open( vlc_object_t * p_this )
119 input_thread_t *p_input = (input_thread_t *)p_this;
122 byte_t *p_peek, *p_peek_backup;
125 dv_header_t dv_header;
129 /* It isn't easy to recognize a raw dv stream. The chances that we'll
130 * mistake a stream from another type for a raw dv stream are too high, so
131 * we'll rely on the file extension to trigger this demux. Alternatively,
132 * it is possible to force this demux. */
134 /* Check for dv file extension */
135 psz_ext = strrchr ( p_input->psz_name, '.' );
136 if( ( !psz_ext || strcasecmp( psz_ext, ".dv") )&&
137 ( !p_input->psz_demux || strcmp(p_input->psz_demux, "rawdv") ) )
142 if( stream_Peek( p_input->s, &p_peek, DV_PAL_FRAME_SIZE ) <
145 /* Stream too short ... */
146 msg_Err( p_input, "cannot peek()" );
149 p_peek_backup = p_peek;
151 /* fill in the dv_id_t structure */
152 i_dword = GetDWBE( p_peek ); p_peek += 4;
153 dv_id.sct = i_dword >> (32 - 3);
155 dv_id.dsn = i_dword >> (32 - 4);
157 dv_id.fsc = i_dword >> (32 - 1);
159 dv_id.dbn = i_dword >> (32 - 8);
164 msg_Warn( p_input, "not a raw dv stream header" );
168 /* fill in the dv_header_t structure */
169 dv_header.dsf = i_dword >> (32 - 1);
171 if( i_dword >> (32 - 1) ) /* incorrect bit */
173 msg_Warn( p_input, "incorrect bit" );
177 i_dword = GetDWBE( p_peek ); p_peek += 4;
179 dv_header.apt = i_dword >> (32 - 3);
181 dv_header.tf1 = i_dword >> (32 - 1);
183 dv_header.ap1 = i_dword >> (32 - 3);
185 dv_header.tf2 = i_dword >> (32 - 1);
187 dv_header.ap2 = i_dword >> (32 - 3);
189 dv_header.tf3 = i_dword >> (32 - 1);
191 dv_header.ap3 = i_dword >> (32 - 3);
193 p_peek += 72; /* skip rest of DIF block */
196 /* Set p_input field */
197 p_input->pf_demux = Demux;
198 p_input->pf_demux_control = demux_vaControlDefault;
199 p_input->p_demux_data = p_sys = malloc( sizeof( demux_sys_t ) );
201 p_sys->i_dsf = dv_header.dsf;
202 p_sys->frame_size = dv_header.dsf ? 12 * 150 * 80 : 10 * 150 * 80;
203 p_sys->f_rate = dv_header.dsf ? 25 : 29.97;
206 p_sys->p_es_video = NULL;
207 p_sys->p_es_audio = NULL;
209 p_sys->i_bitrate = 0;
211 es_format_Init( &p_sys->fmt_video, VIDEO_ES, VLC_FOURCC('d','v','s','d') );
212 p_sys->fmt_video.video.i_width = 720;
213 p_sys->fmt_video.video.i_height= dv_header.dsf ? 576 : 480;;
215 /* necessary because input_SplitBuffer() will only get
216 * INPUT_DEFAULT_BUFSIZE bytes at a time. */
217 p_input->i_bufsize = p_sys->frame_size;
219 vlc_mutex_lock( &p_input->stream.stream_lock );
220 if( input_InitStream( p_input, 0 ) == -1)
222 vlc_mutex_unlock( &p_input->stream.stream_lock );
223 msg_Err( p_input, "cannot init stream" );
227 p_input->stream.i_mux_rate = p_sys->frame_size * p_sys->f_rate;
228 vlc_mutex_unlock( &p_input->stream.stream_lock );
230 p_sys->p_es_video = es_out_Add( p_input->p_es_out, &p_sys->fmt_video );
233 p_peek = p_peek_backup + 80*6+80*16*3 + 3; /* beginning of AAUX pack */
234 if( *p_peek == 0x50 )
236 es_format_Init( &p_sys->fmt_audio, AUDIO_ES,
237 VLC_FOURCC('a','r','a','w') );
239 p_sys->fmt_audio.audio.i_channels = 2;
240 switch( (p_peek[4] >> 3) & 0x07 )
243 p_sys->fmt_audio.audio.i_rate = 48000;
246 p_sys->fmt_audio.audio.i_rate = 44100;
250 p_sys->fmt_audio.audio.i_rate = 32000;
254 /* 12 bits non-linear will be converted to 16 bits linear */
255 p_sys->fmt_audio.audio.i_bitspersample = 16;
257 p_sys->p_es_audio = es_out_Add( p_input->p_es_out, &p_sys->fmt_audio );
263 /*****************************************************************************
264 * Close: frees unused data
265 *****************************************************************************/
266 static void Close( vlc_object_t *p_this )
268 input_thread_t *p_input = (input_thread_t *)p_this;
269 demux_sys_t *p_sys = p_input->p_demux_data;
274 /*****************************************************************************
275 * Demux: reads and demuxes data packets
276 *****************************************************************************
277 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
278 *****************************************************************************/
279 static int Demux( input_thread_t * p_input )
281 demux_sys_t *p_sys = p_input->p_demux_data;
283 vlc_bool_t b_audio = VLC_FALSE, b_video = VLC_FALSE;
285 if( p_input->stream.p_selected_program->i_synchro_state == SYNCHRO_REINIT )
287 off_t i_pos = stream_Tell( p_input->s );
289 msg_Warn( p_input, "synchro reinit" );
291 /* If the user tried to seek in the stream, we need to make sure
292 * the new position is at a DIF block boundary. */
293 if( i_pos % p_sys->frame_size > 0 )
295 i_pos += p_sys->frame_size - i_pos % p_sys->frame_size;
297 if( stream_Seek( p_input->s, i_pos ) )
299 msg_Warn( p_input, "cannot resynch after seek (EOF?)" );
305 /* Call the pace control */
306 input_ClockManageRef( p_input, p_input->stream.p_selected_program,
309 if( ( p_block = stream_Block( p_input->s, p_sys->frame_size ) ) == NULL )
315 es_out_Control( p_input->p_es_out, ES_OUT_GET_ES_STATE,
316 p_sys->p_es_video, &b_video );
318 if( p_sys->p_es_audio )
320 es_out_Control( p_input->p_es_out, ES_OUT_GET_ES_STATE,
321 p_sys->p_es_audio, &b_audio );
325 p_block->i_pts = input_ClockGetTS( p_input,
326 p_input->stream.p_selected_program,
330 block_t *p_audio_block = dv_extract_audio( p_input, p_block );
333 p_audio_block->i_pts = p_audio_block->i_dts = p_block->i_dts;
334 es_out_Send( p_input->p_es_out, p_sys->p_es_audio, p_audio_block );
339 es_out_Send( p_input->p_es_out, p_sys->p_es_video, p_block );
341 block_Release( p_block );
343 p_sys->i_pcr += ( 90000 / p_sys->f_rate );
348 static const uint16_t dv_audio_shuffle525[10][9] = {
349 { 0, 30, 60, 20, 50, 80, 10, 40, 70 }, /* 1st channel */
350 { 6, 36, 66, 26, 56, 86, 16, 46, 76 },
351 { 12, 42, 72, 2, 32, 62, 22, 52, 82 },
352 { 18, 48, 78, 8, 38, 68, 28, 58, 88 },
353 { 24, 54, 84, 14, 44, 74, 4, 34, 64 },
355 { 1, 31, 61, 21, 51, 81, 11, 41, 71 }, /* 2nd channel */
356 { 7, 37, 67, 27, 57, 87, 17, 47, 77 },
357 { 13, 43, 73, 3, 33, 63, 23, 53, 83 },
358 { 19, 49, 79, 9, 39, 69, 29, 59, 89 },
359 { 25, 55, 85, 15, 45, 75, 5, 35, 65 },
362 static const uint16_t dv_audio_shuffle625[12][9] = {
363 { 0, 36, 72, 26, 62, 98, 16, 52, 88}, /* 1st channel */
364 { 6, 42, 78, 32, 68, 104, 22, 58, 94},
365 { 12, 48, 84, 2, 38, 74, 28, 64, 100},
366 { 18, 54, 90, 8, 44, 80, 34, 70, 106},
367 { 24, 60, 96, 14, 50, 86, 4, 40, 76},
368 { 30, 66, 102, 20, 56, 92, 10, 46, 82},
370 { 1, 37, 73, 27, 63, 99, 17, 53, 89}, /* 2nd channel */
371 { 7, 43, 79, 33, 69, 105, 23, 59, 95},
372 { 13, 49, 85, 3, 39, 75, 29, 65, 101},
373 { 19, 55, 91, 9, 45, 81, 35, 71, 107},
374 { 25, 61, 97, 15, 51, 87, 5, 41, 77},
375 { 31, 67, 103, 21, 57, 93, 11, 47, 83},
378 static inline uint16_t dv_audio_12to16( uint16_t sample )
380 uint16_t shift, result;
382 sample = (sample < 0x800) ? sample : sample | 0xf000;
383 shift = (sample & 0xf00) >> 8;
385 if (shift < 0x2 || shift > 0xd) {
387 } else if (shift < 0x8) {
389 result = (sample - (256 * shift)) << shift;
392 result = ((sample + ((256 * shift) + 1)) << shift) - 1;
398 static block_t *dv_extract_audio( input_thread_t * p_input,
399 block_t* p_frame_block )
401 demux_sys_t *p_sys = p_input->p_demux_data;
403 uint8_t *p_frame, *p_buf;
404 int i_audio_quant, i_samples, i_size, i_half_ch;
405 const uint16_t (*audio_shuffle)[9];
409 /* Beginning of AAUX pack */
410 p_buf = p_frame_block->p_buffer + 80*6+80*16*3 + 3;
411 if( *p_buf != 0x50 ) return NULL;
413 i_audio_quant = p_buf[4] & 0x07; /* 0 - 16bit, 1 - 12bit */
414 if( i_audio_quant > 1 )
416 msg_Dbg( p_input, "Unsupported quantization for DV audio");
420 i_samples = p_buf[1] & 0x3f; /* samples in this frame - min samples */
421 switch( (p_buf[4] >> 3) & 0x07 )
424 i_size = p_sys->i_dsf ? 1896 : 1580;
427 i_size = p_sys->i_dsf ? 1742 : 1452;
431 i_size = p_sys->i_dsf ? 1264 : 1053;
434 i_size = (i_size + i_samples) * 4; /* 2ch, 2bytes */
436 p_block = block_New( p_input, i_size );
438 /* for each DIF segment */
439 p_frame = p_frame_block->p_buffer;
440 audio_shuffle = p_sys->i_dsf ? dv_audio_shuffle625 : dv_audio_shuffle525;
441 i_half_ch = (p_sys->i_dsf ? 12 : 10)/2;
442 for( i = 0; i < (p_sys->i_dsf ? 12 : 10); i++ )
444 p_frame += 6 * 80; /* skip DIF segment header */
446 if( i_audio_quant == 1 && i == i_half_ch ) break;
448 for( j = 0; j < 9; j++ )
450 for( d = 8; d < 80; d += 2 )
452 if( i_audio_quant == 0 )
454 /* 16bit quantization */
455 of = audio_shuffle[i][j] + (d - 8) / 2 *
456 (p_sys->i_dsf ? 108 : 90);
458 if( of * 2 >= i_size ) continue;
461 p_block->p_buffer[of*2] = p_frame[d+1];
462 p_block->p_buffer[of*2+1] = p_frame[d];
464 if( p_block->p_buffer[of*2+1] == 0x80 &&
465 p_block->p_buffer[of*2] == 0x00 )
466 p_block->p_buffer[of*2+1] = 0;
470 /* 12bit quantization */
471 lc = ((uint16_t)p_frame[d] << 4) |
472 ((uint16_t)p_frame[d+2] >> 4);
473 lc = (lc == 0x800 ? 0 : dv_audio_12to16(lc));
475 of = audio_shuffle[i][j] + (d - 8) / 3 *
476 (p_sys->i_dsf ? 108 : 90);
477 if( of*2 >= i_size ) continue;
480 p_block->p_buffer[of*2] = lc & 0xff;
481 p_block->p_buffer[of*2+1] = lc >> 8;
486 p_frame += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */