falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
3369 Commits
32 Branches
935MB
Tree: 1fa3d65d57
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from '1fa3d65d57'
${ noResults }
FFmpeg/libavformat/dv.c

946 lines
32KB
Raw Blame History 

  1. /* 

  2.  * General DV muxer/demuxer 

  3.  * Copyright (c) 2003 Roman Shaposhnick

  4.  *

  5.  * Many thanks to Dan Dennedy <dan@dennedy.org> for providing wealth

  6.  * of DV technical info.

  7.  *

  8.  * Raw DV format

  9.  * Copyright (c) 2002 Fabrice Bellard.

  10.  *

  11.  * This library is free software; you can redistribute it and/or

  12.  * modify it under the terms of the GNU Lesser General Public

  13.  * License as published by the Free Software Foundation; either

  14.  * version 2 of the License, or (at your option) any later version.

  15.  *

  16.  * This library is distributed in the hope that it will be useful,

  17.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  18.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  19.  * Lesser General Public License for more details.

  20.  *

  21.  * You should have received a copy of the GNU Lesser General Public

  22.  * License along with this library; if not, write to the Free Software

  23.  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

  24.  */

  25. #include <time.h>

  26. #include "avformat.h"

  27. #include "dvdata.h"

  28. #include "dv.h"

  29. 

  30. struct DVDemuxContext {

  31.     AVFormatContext* fctx;

  32.     AVStream*        vst;

  33.     AVStream*        ast[2];       

  34.     AVPacket         audio_pkt[2];

  35.     int              ach;

  36.     int              frames;

  37.     uint64_t         abytes;

  38. };

  39. 

  40. struct DVMuxContext {

  41.     const DVprofile*  sys;    /* Current DV profile. E.g.: 525/60, 625/50 */

  42.     uint8_t     frame_buf[144000]; /* frame under contruction */

  43.     FifoBuffer  audio_data;   /* Fifo for storing excessive amounts of PCM */

  44.     int         frames;       /* Number of a current frame */

  45.     time_t      start_time;   /* Start time of recording */

  46.     uint8_t     aspect;       /* Aspect ID 0 - 4:3, 7 - 16:9 */

  47.     int         has_audio;    /* frame under contruction has audio */

  48.     int         has_video;    /* frame under contruction has video */

  49. };

  50. 

  51. enum dv_section_type {

  52.      dv_sect_header  = 0x1f,

  53.      dv_sect_subcode = 0x3f,

  54.      dv_sect_vaux    = 0x56,

  55.      dv_sect_audio   = 0x76,

  56.      dv_sect_video   = 0x96,

  57. };

  58. 

  59. enum dv_pack_type {

  60.      dv_header525     = 0x3f, /* see dv_write_pack for important details on */ 

  61.      dv_header625     = 0xbf, /* these two packs */

  62.      dv_timecode      = 0x13,

  63.      dv_audio_source  = 0x50,

  64.      dv_audio_control = 0x51,

  65.      dv_audio_recdate = 0x52,

  66.      dv_audio_rectime = 0x53,

  67.      dv_video_source  = 0x60,

  68.      dv_video_control = 0x61,

  69.      dv_viedo_recdate = 0x62,

  70.      dv_video_rectime = 0x63,

  71.      dv_unknown_pack  = 0xff,

  72. };

  73. 

  74. 

  75. 

  76. /*

  77.  * The reason why the following three big ugly looking tables are

  78.  * here is my lack of DV spec IEC 61834. The tables were basically 

  79.  * constructed to make code that places packs in SSYB, VAUX and 

  80.  * AAUX blocks very simple and table-driven. They conform to the

  81.  * SMPTE 314M and the output of my personal DV camcorder, neither

  82.  * of which is sufficient for a reliable DV stream producing. Thus

  83.  * while code is still in development I'll be gathering input from

  84.  * people with different DV equipment and modifying the tables to

  85.  * accommodate all the quirks. Later on, if possible, some of them

  86.  * will be folded into smaller tables and/or switch-if logic. For 

  87.  * now, my only excuse is -- they don't eat up that much of a space.

  88.  */

  89. 

  90. static const int dv_ssyb_packs_dist[12][6] = {

  91.     { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },

  92.     { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },

  93.     { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },

  94.     { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },

  95.     { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },

  96.     { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },

  97.     { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },

  98.     { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },

  99.     { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },

  100.     { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },

  101.     { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },

  102.     { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },

  103. };

  104. 

  105. static const int dv_vaux_packs_dist[12][15] = {

  106.     { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 

  107.       0x60, 0x61, 0x62, 0x63, 0xff, 0xff },

  108.     { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 

  109.       0x60, 0x61, 0x62, 0x63, 0xff, 0xff },

  110.     { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 

  111.       0x60, 0x61, 0x62, 0x63, 0xff, 0xff },

  112.     { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 

  113.       0x60, 0x61, 0x62, 0x63, 0xff, 0xff },

  114.     { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 

  115.       0x60, 0x61, 0x62, 0x63, 0xff, 0xff },

  116.     { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 

  117.       0x60, 0x61, 0x62, 0x63, 0xff, 0xff },

  118.     { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 

  119.       0x60, 0x61, 0x62, 0x63, 0xff, 0xff },

  120.     { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 

  121.       0x60, 0x61, 0x62, 0x63, 0xff, 0xff },

  122.     { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 

  123.       0x60, 0x61, 0x62, 0x63, 0xff, 0xff },

  124.     { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 

  125.       0x60, 0x61, 0x62, 0x63, 0xff, 0xff },

  126.     { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 

  127.       0x60, 0x61, 0x62, 0x63, 0xff, 0xff },

  128.     { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 

  129.       0x60, 0x61, 0x62, 0x63, 0xff, 0xff },

  130. };

  131. 

  132. static const int dv_aaux_packs_dist[12][9] = {

  133.     { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },

  134.     { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },

  135.     { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },

  136.     { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },

  137.     { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },

  138.     { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },

  139.     { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },

  140.     { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },

  141.     { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },

  142.     { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },

  143.     { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },

  144.     { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },

  145. };

  146. 

  147. static inline uint16_t dv_audio_12to16(uint16_t sample)

  148. {

  149.     uint16_t shift, result;

  150.     

  151.     sample = (sample < 0x800) ? sample : sample | 0xf000;

  152.     shift = (sample & 0xf00) >> 8;

  153. 

  154.     if (shift < 0x2 || shift > 0xd) {

  155. 	result = sample;

  156.     } else if (shift < 0x8) {

  157.         shift--;

  158. 	result = (sample - (256 * shift)) << shift;

  159.     } else {

  160. 	shift = 0xe - shift;

  161. 	result = ((sample + ((256 * shift) + 1)) << shift) - 1;

  162.     }

  163. 

  164.     return result;

  165. }

  166. 

  167. static int dv_audio_frame_size(const DVprofile* sys, int frame)

  168. {

  169.     return sys->audio_samples_dist[frame % (sizeof(sys->audio_samples_dist)/

  170. 		                            sizeof(sys->audio_samples_dist[0]))];

  171. }

  172. 

  173. static int dv_write_pack(enum dv_pack_type pack_id, DVMuxContext *c, uint8_t* buf)

  174. {

  175.     struct tm tc;

  176.     time_t ct;

  177.     int ltc_frame;

  178. 

  179.     buf[0] = (uint8_t)pack_id;

  180.     switch (pack_id) {

  181.     case dv_header525: /* I can't imagine why these two weren't defined as real */

  182.     case dv_header625: /* packs in SMPTE314M -- they definitely look like ones */

  183.           buf[1] = 0xf8 |               /* reserved -- always 1 */

  184. 	           (0 & 0x07);          /* APT: Track application ID */

  185.           buf[2] = (0 << 7)    | /* TF1: audio data is 0 - valid; 1 - invalid */

  186. 	           (0x0f << 3) | /* reserved -- always 1 */

  187. 		   (0 & 0x07);   /* AP1: Audio application ID */

  188.           buf[3] = (0 << 7)    | /* TF2: video data is 0 - valid; 1 - invalid */  

  189. 	           (0x0f << 3) | /* reserved -- always 1 */

  190. 		   (0 & 0x07);   /* AP2: Video application ID */

  191.           buf[4] = (0 << 7)    | /* TF3: subcode(SSYB) is 0 - valid; 1 - invalid */ 

  192. 	           (0x0f << 3) | /* reserved -- always 1 */

  193. 		   (0 & 0x07);   /* AP3: Subcode application ID */

  194. 	  break;

  195.     case dv_timecode:

  196.           ct = (time_t)(c->frames / ((float)c->sys->frame_rate / 

  197.                                      (float)c->sys->frame_rate_base));

  198.           localtime_r(&ct, &tc);

  199.           /* 

  200.            * LTC drop-frame frame counter drops two frames (0 and 1) every 

  201.            * minute, unless it is exactly divisible by 10

  202.            */

  203.           ltc_frame = (c->frames + 2*ct/60 - 2*ct/600) % c->sys->ltc_divisor;

  204. 	  buf[1] = (0 << 7) | /* Color fame: 0 - unsync; 1 - sync mode */

  205. 		   (1 << 6) | /* Drop frame timecode: 0 - nondrop; 1 - drop */

  206. 		   ((ltc_frame / 10) << 4) | /* Tens of frames */

  207. 		   (ltc_frame % 10);         /* Units of frames */

  208. 	  buf[2] = (1 << 7) | /* Biphase mark polarity correction: 0 - even; 1 - odd */

  209. 		   ((tc.tm_sec / 10) << 4) | /* Tens of seconds */

  210. 		   (tc.tm_sec % 10);         /* Units of seconds */

  211. 	  buf[3] = (1 << 7) | /* Binary group flag BGF0 */

  212. 		   ((tc.tm_min / 10) << 4) | /* Tens of minutes */

  213. 		   (tc.tm_min % 10);         /* Units of minutes */

  214. 	  buf[4] = (1 << 7) | /* Binary group flag BGF2 */

  215. 		   (1 << 6) | /* Binary group flag BGF1 */

  216. 	           ((tc.tm_hour / 10) << 4) | /* Tens of hours */

  217. 		   (tc.tm_hour % 10);         /* Units of hours */

  218.           break;

  219.     case dv_audio_source:  /* AAUX source pack */

  220.           buf[1] = (0 << 7) | /* locked mode       */

  221.                    (1 << 6) | /* reserved -- always 1 */

  222. 	           (dv_audio_frame_size(c->sys, c->frames) -

  223. 		    c->sys->audio_min_samples[0]);

  224. 	                      /* # of samples      */

  225.           buf[2] = (0 << 7) | /* multi-stereo      */

  226.                    (0 << 5) | /* #of audio channels per block: 0 -- 1 channel */

  227.                    (0 << 4) | /* pair bit: 0 -- one pair of channels */

  228. 	            0;        /* audio mode        */

  229.           buf[3] = (1 << 7) | /* res               */

  230.                    (1 << 6) | /* multi-language flag */

  231. 	           (c->sys->dsf << 5) | /*  system: 60fields/50fields */

  232. 	            0;        /* definition: 0 -- SD (525/625) */

  233.           buf[4] = (1 << 7) | /* emphasis: 1 -- off */

  234.                    (0 << 6) | /* emphasis time constant: 0 -- reserved */

  235. 	           (0 << 3) | /* frequency: 0 -- 48Khz, 1 -- 44,1Khz, 2 -- 32Khz */

  236.                     0;        /* quantization: 0 -- 16bit linear, 1 -- 12bit nonlinear */			    

  237.           break;

  238.     case dv_audio_control:

  239.           buf[1] = (0 << 6) | /* copy protection: 0 -- unrestricted */

  240.                    (1 << 4) | /* input source: 1 -- digital input */

  241. 	           (3 << 2) | /* compression: 3 -- no information */

  242. 	            0;        /* misc. info/SMPTE emphasis off */

  243.           buf[2] = (1 << 7) | /* recording start point: 1 -- no */

  244.                    (1 << 6) | /* recording end point: 1 -- no */

  245. 	           (1 << 3) | /* recording mode: 1 -- original */

  246. 	            7;         

  247.           buf[3] = (1 << 7) | /* direction: 1 -- forward */

  248.                     0x20;     /* speed */

  249.           buf[4] = (1 << 7) | /* reserved -- always 1 */

  250.                     0x7f;     /* genre category */

  251. 	  break;

  252.     case dv_audio_recdate:

  253.     case dv_viedo_recdate:  /* VAUX recording date */

  254.           ct = c->start_time + (time_t)(c->frames / 

  255. 	       ((float)c->sys->frame_rate / (float)c->sys->frame_rate_base));

  256.           localtime_r(&ct, &tc);

  257. 	  buf[1] = 0xff; /* ds, tm, tens of time zone, units of time zone */

  258. 	                 /* 0xff is very likely to be "unknown" */

  259. 	  buf[2] = (3 << 6) | /* reserved -- always 1 */

  260. 		   ((tc.tm_mday / 10) << 4) | /* Tens of day */

  261. 		   (tc.tm_mday % 10);         /* Units of day */

  262. 	  buf[3] = /* we set high 4 bits to 0, shouldn't we set them to week? */

  263. 		   (tc.tm_mon % 10);         /* Units of month */

  264. 	  buf[4] = (((tc.tm_year % 100) / 10) << 4) | /* Tens of year */

  265. 		   (tc.tm_year % 10);                 /* Units of year */

  266.           break;

  267.     case dv_audio_rectime:  /* AAUX recording time */

  268.     case dv_video_rectime:  /* VAUX recording time */

  269.           ct = c->start_time + (time_t)(c->frames / 

  270. 	       ((float)c->sys->frame_rate / (float)c->sys->frame_rate_base));

  271.           localtime_r(&ct, &tc);

  272. 	  buf[1] = (3 << 6) | /* reserved -- always 1 */

  273. 		   0x3f; /* tens of frame, units of frame: 0x3f - "unknown" ? */

  274. 	  buf[2] = (1 << 7) | /* reserved -- always 1 */ 

  275. 		   ((tc.tm_sec / 10) << 4) | /* Tens of seconds */

  276. 		   (tc.tm_sec % 10);         /* Units of seconds */

  277. 	  buf[3] = (1 << 7) | /* reserved -- always 1 */

  278. 		   ((tc.tm_min / 10) << 4) | /* Tens of minutes */

  279. 		   (tc.tm_min % 10);         /* Units of minutes */

  280. 	  buf[4] = (3 << 6) | /* reserved -- always 1 */ 

  281. 	           ((tc.tm_hour / 10) << 4) | /* Tens of hours */

  282. 		   (tc.tm_hour % 10);         /* Units of hours */

  283. 	  break;

  284.     case dv_video_source:

  285. 	  buf[1] = 0xff; /* reserved -- always 1 */

  286. 	  buf[2] = (1 << 7) | /* B/W: 0 - b/w, 1 - color */

  287. 		   (1 << 6) | /* following CLF is valid - 0, invalid - 1 */

  288. 		   (3 << 4) | /* CLF: color frames id (see ITU-R BT.470-4) */

  289. 		   0xf; /* reserved -- always 1 */

  290. 	  buf[3] = (3 << 6) | /* reserved -- always 1 */

  291. 		   (c->sys->dsf << 5) | /*  system: 60fields/50fields */

  292. 		   0; /* signal type video compression */

  293. 	  buf[4] = 0xff; /* VISC: 0xff -- no information */

  294.           break;

  295.     case dv_video_control:

  296. 	  buf[1] = (0 << 6) | /* Copy generation management (CGMS) 0 -- free */

  297. 		   0x3f; /* reserved -- always 1 */

  298. 	  buf[2] = 0xc8 | /* reserved -- always b11001xxx */

  299. 		   c->aspect;

  300. 	  buf[3] = (1 << 7) | /* Frame/field flag 1 -- frame, 0 -- field */

  301. 		   (1 << 6) | /* First/second field flag 0 -- field 2, 1 -- field 1 */

  302. 		   (1 << 5) | /* Frame change flag 0 -- same picture as before, 1 -- different */

  303. 		   (1 << 4) | /* 1 - interlaced, 0 - noninterlaced */

  304. 		   0xc; /* reserved -- always b1100 */

  305. 	  buf[4] = 0xff; /* reserved -- always 1 */

  306.           break;

  307.     default:

  308.           buf[1] = buf[2] = buf[3] = buf[4] = 0xff;

  309.     }

  310.     return 5;

  311. }

  312. 

  313. static inline int dv_write_dif_id(enum dv_section_type t, uint8_t seq_num, 

  314.                                   uint8_t dif_num, uint8_t* buf)

  315. {

  316.     buf[0] = (uint8_t)t;    /* Section type */

  317.     buf[1] = (seq_num<<4) | /* DIF seq number 0-9 for 525/60; 0-11 for 625/50 */

  318. 	     (0 << 3) |     /* FSC: for 50Mb/s 0 - first channel; 1 - second */

  319. 	     7;             /* reserved -- always 1 */

  320.     buf[2] = dif_num;       /* DIF block number Video: 0-134, Audio: 0-8 */

  321.     return 3;

  322. }

  323. 

  324. static inline int dv_write_ssyb_id(uint8_t syb_num, uint8_t fr, uint8_t* buf)

  325. {

  326.     if (syb_num == 0 || syb_num == 6) {

  327. 	buf[0] = (fr<<7) | /* FR ID 1 - first half of each channel; 0 - second */

  328. 		 (0<<4)  | /* AP3 (Subcode application ID) */

  329. 		 0x0f;     /* reserved -- always 1 */

  330.     } 

  331.     else if (syb_num == 11) {

  332. 	buf[0] = (fr<<7) | /* FR ID 1 - first half of each channel; 0 - second */

  333.                  0x7f;     /* reserved -- always 1 */

  334.     }

  335.     else {

  336. 	buf[0] = (fr<<7) | /* FR ID 1 - first half of each channel; 0 - second */

  337.                  (0<<4)  | /* APT (Track application ID) */

  338. 		 0x0f;     /* reserved -- always 1 */

  339.     }

  340.     buf[1] = 0xf0 |            /* reserved -- always 1 */

  341.              (syb_num & 0x0f); /* SSYB number 0 - 11   */

  342.     buf[2] = 0xff;             /* reserved -- always 1 */

  343.     return 3;

  344. }

  345. 

  346. static void dv_format_frame(DVMuxContext *c, uint8_t* buf)

  347. {

  348.     int i, j, k;

  349.     

  350.     for (i = 0; i < c->sys->difseg_size; i++) {

  351.        memset(buf, 0xff, 80 * 6); /* First 6 DIF blocks are for control data */

  352.        

  353.        /* DV header: 1DIF */

  354.        buf += dv_write_dif_id(dv_sect_header, i, 0, buf);

  355.        buf += dv_write_pack((c->sys->dsf ? dv_header625 : dv_header525), c, buf);

  356.        buf += 72; /* unused bytes */

  357. 				   

  358.        /* DV subcode: 2DIFs */

  359.        for (j = 0; j < 2; j++) {

  360.           buf += dv_write_dif_id( dv_sect_subcode, i, j, buf);

  361. 	  for (k = 0; k < 6; k++) {

  362. 	     buf += dv_write_ssyb_id(k, (i < c->sys->difseg_size/2), buf);

  363. 	     buf += dv_write_pack(dv_ssyb_packs_dist[i][k], c, buf);

  364. 	  }

  365. 	  buf += 29; /* unused bytes */

  366.        }

  367.        

  368.        /* DV VAUX: 3DIFs */

  369.        for (j = 0; j < 3; j++) {

  370. 	  buf += dv_write_dif_id(dv_sect_vaux, i, j, buf);

  371. 	  for (k = 0; k < 15 ; k++)

  372. 	     buf += dv_write_pack(dv_vaux_packs_dist[i][k], c, buf);

  373. 	  buf += 2; /* unused bytes */

  374.        } 

  375.        

  376.        /* DV Audio/Video: 135 Video DIFs + 9 Audio DIFs */

  377.        for (j = 0; j < 135; j++) {

  378.             if (j%15 == 0) {

  379. 	        buf += dv_write_dif_id(dv_sect_audio, i, j/15, buf);

  380. 	        buf += dv_write_pack(dv_aaux_packs_dist[i][j/15], c, buf);

  381. 		buf += 72; /* shuffled PCM audio */

  382. 	    }

  383. 	    buf += dv_write_dif_id(dv_sect_video, i, j, buf);

  384. 	    buf += 77; /* 1 video macro block: 1 bytes control

  385. 			                       4 * 14 bytes Y 8x8 data

  386. 			                           10 bytes Cr 8x8 data

  387. 						   10 bytes Cb 8x8 data */

  388.        }

  389.     }

  390. }

  391. 

  392. static void dv_inject_audio(DVMuxContext *c, const uint8_t* pcm, uint8_t* frame_ptr)

  393. {

  394.     int i, j, d, of;

  395.     for (i = 0; i < c->sys->difseg_size; i++) {

  396.        frame_ptr += 6 * 80; /* skip DIF segment header */

  397.        for (j = 0; j < 9; j++) {

  398.           for (d = 8; d < 80; d+=2) {

  399. 	     of = c->sys->audio_shuffle[i][j] + (d - 8)/2 * c->sys->audio_stride;

  400. 	     frame_ptr[d] = pcm[of*2+1]; // FIXME: may be we have to admit

  401. 	     frame_ptr[d+1] = pcm[of*2]; //        that DV is a big endian PCM       

  402.           }

  403.           frame_ptr += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */

  404.        }

  405.     }

  406. }

  407. 

  408. static void dv_inject_video(DVMuxContext *c, const uint8_t* video_data, uint8_t* frame_ptr)

  409. {

  410.     int i, j;

  411.     int ptr = 0;

  412. 

  413.     for (i = 0; i < c->sys->difseg_size; i++) {

  414.        ptr += 6 * 80; /* skip DIF segment header */

  415.        for (j = 0; j < 135; j++) {

  416.             if (j%15 == 0)

  417. 	        ptr += 80; /* skip Audio DIF */

  418. 	    ptr += 3;

  419. 	    memcpy(frame_ptr + ptr, video_data + ptr, 77);

  420. 	    ptr += 77;

  421.        }

  422.     }

  423. }

  424. 

  425. /* 

  426.  * This is the dumbest implementation of all -- it simply looks at

  427.  * a fixed offset and if pack isn't there -- fails. We might want

  428.  * to have a fallback mechanism for complete search of missing packs.

  429.  */

  430. static const uint8_t* dv_extract_pack(uint8_t* frame, enum dv_pack_type t)

  431. {

  432.     int offs;

  433.     

  434.     switch (t) {

  435.     case dv_audio_source:

  436.           offs = (80*6 + 80*16*3 + 3);

  437. 	  break;

  438.     case dv_audio_control:

  439.           offs = (80*6 + 80*16*4 + 3);

  440. 	  break;

  441.     case dv_video_control:

  442.           offs = (80*5 + 48 + 5);

  443.           break;

  444.     default:

  445.           return NULL;

  446.     }   

  447. 

  448.     return (frame[offs] == t ? &frame[offs] : NULL);

  449. }

  450. 

  451. /* 

  452.  * There's a couple of assumptions being made here:

  453.  * 1. By default we silence erroneous (0x8000/16bit 0x800/12bit) audio samples.

  454.  *    We can pass them upwards when ffmpeg will be ready to deal with them.

  455.  * 2. We don't do software emphasis.

  456.  * 3. Audio is always returned as 16bit linear samples: 12bit nonlinear samples

  457.  *    are converted into 16bit linear ones.

  458.  */

  459. static int dv_extract_audio(uint8_t* frame, uint8_t* pcm, uint8_t* pcm2)

  460. {

  461.     int size, i, j, d, of, smpls, freq, quant, half_ch;

  462.     uint16_t lc, rc;

  463.     const DVprofile* sys;

  464.     const uint8_t* as_pack;

  465.     

  466.     as_pack = dv_extract_pack(frame, dv_audio_source);

  467.     if (!as_pack)    /* No audio ? */

  468. 	return 0;

  469.    

  470.     sys = dv_frame_profile(frame);

  471.     smpls = as_pack[1] & 0x3f; /* samples in this frame - min. samples */

  472.     freq = (as_pack[4] >> 3) & 0x07; /* 0 - 48KHz, 1 - 44,1kHz, 2 - 32 kHz */

  473.     quant = as_pack[4] & 0x07; /* 0 - 16bit linear, 1 - 12bit nonlinear */

  474.     

  475.     if (quant > 1)

  476. 	return -1; /* Unsupported quantization */

  477. 

  478.     size = (sys->audio_min_samples[freq] + smpls) * 4; /* 2ch, 2bytes */

  479.     half_ch = sys->difseg_size/2;

  480. 

  481.     /* for each DIF segment */

  482.     for (i = 0; i < sys->difseg_size; i++) {

  483.        frame += 6 * 80; /* skip DIF segment header */

  484.        if (quant == 1 && i == half_ch) {

  485.            if (!pcm2)

  486.                break;

  487.            else

  488.                pcm = pcm2;

  489.        }

  490. 

  491.        for (j = 0; j < 9; j++) {

  492.           for (d = 8; d < 80; d += 2) {

  493. 	     if (quant == 0) {  /* 16bit quantization */

  494. 		 of = sys->audio_shuffle[i][j] + (d - 8)/2 * sys->audio_stride;

  495.                  if (of*2 >= size)

  496. 		     continue;

  497. 		 

  498. 		 pcm[of*2] = frame[d+1]; // FIXME: may be we have to admit

  499. 		 pcm[of*2+1] = frame[d]; //        that DV is a big endian PCM

  500. 		 if (pcm[of*2+1] == 0x80 && pcm[of*2] == 0x00)

  501. 		     pcm[of*2+1] = 0;

  502. 	      } else {           /* 12bit quantization */

  503. 		 lc = ((uint16_t)frame[d] << 4) | 

  504. 		      ((uint16_t)frame[d+2] >> 4);

  505. 		 rc = ((uint16_t)frame[d+1] << 4) |

  506. 	              ((uint16_t)frame[d+2] & 0x0f);

  507. 		 lc = (lc == 0x800 ? 0 : dv_audio_12to16(lc));

  508. 		 rc = (rc == 0x800 ? 0 : dv_audio_12to16(rc));

  509. 

  510. 		 of = sys->audio_shuffle[i%half_ch][j] + (d - 8)/3 * sys->audio_stride;

  511.                  if (of*2 >= size)

  512. 		     continue;

  513. 

  514. 		 pcm[of*2] = lc & 0xff; // FIXME: may be we have to admit

  515. 		 pcm[of*2+1] = lc >> 8; //        that DV is a big endian PCM

  516. 		 of = sys->audio_shuffle[i%half_ch+half_ch][j] + 

  517. 		      (d - 8)/3 * sys->audio_stride;

  518. 		 pcm[of*2] = rc & 0xff; // FIXME: may be we have to admit

  519. 		 pcm[of*2+1] = rc >> 8; //        that DV is a big endian PCM

  520. 		 ++d;

  521. 	      }

  522. 	  }

  523. 		

  524. 	  frame += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */

  525.         }

  526.     }

  527. 

  528.     return size;

  529. }

  530. 

  531. static int dv_extract_audio_info(DVDemuxContext* c, uint8_t* frame)

  532. {

  533.     const uint8_t* as_pack;

  534.     const DVprofile* sys;

  535.     int freq, smpls, quant, i;

  536. 

  537.     sys = dv_frame_profile(frame);

  538.     as_pack = dv_extract_pack(frame, dv_audio_source);

  539.     if (!as_pack || !sys) {    /* No audio ? */

  540.         c->ach = 0;

  541. 	return -1;

  542.     }

  543.     

  544.     smpls = as_pack[1] & 0x3f; /* samples in this frame - min. samples */

  545.     freq = (as_pack[4] >> 3) & 0x07; /* 0 - 48KHz, 1 - 44,1kHz, 2 - 32 kHz */

  546.     quant = as_pack[4] & 0x07; /* 0 - 16bit linear, 1 - 12bit nonlinear */

  547.     c->ach = (quant && freq == 2) ? 2 : 1;

  548. 

  549.     /* The second stereo channel could appear in IEC 61834 stream only */

  550.     if (c->ach == 2 && !c->ast[1]) {

  551.         c->ast[1] = av_new_stream(c->fctx, 0);

  552. 	if (c->ast[1]) {

  553. 	    c->ast[1]->codec.codec_type = CODEC_TYPE_AUDIO;

  554. 	    c->ast[1]->codec.codec_id = CODEC_ID_PCM_S16LE;

  555. 	} else

  556. 	    c->ach = 1;

  557.     }

  558.     for (i=0; i<c->ach; i++) {

  559.        c->ast[i]->codec.sample_rate = dv_audio_frequency[freq];

  560.        c->ast[i]->codec.channels = 2;

  561.        c->ast[i]->codec.bit_rate = 2 * dv_audio_frequency[freq] * 16;

  562.     }

  563.     

  564.     return (sys->audio_min_samples[freq] + smpls) * 4; /* 2ch, 2bytes */;

  565. }

  566. 

  567. static int dv_extract_video_info(DVDemuxContext *c, uint8_t* frame)

  568. {

  569.     const DVprofile* sys; 

  570.     const uint8_t* vsc_pack;

  571.     AVCodecContext* avctx;

  572.     int apt, is16_9;

  573.     int size = 0;

  574.     

  575.     sys = dv_frame_profile(frame);

  576.     if (sys) {

  577.         avctx = &c->vst->codec;

  578. 	

  579. 	avctx->frame_rate = sys->frame_rate;

  580.         avctx->frame_rate_base = sys->frame_rate_base;

  581.         avctx->width = sys->width;

  582.         avctx->height = sys->height;

  583.         avctx->pix_fmt = sys->pix_fmt;

  584.         

  585. 	vsc_pack = dv_extract_pack(frame, dv_video_control);

  586.         apt = frame[4] & 0x07;

  587. 	is16_9 = (vsc_pack && (vsc_pack[2] & 0x07) == (apt?0x02:0x07));

  588. 	avctx->sample_aspect_ratio = sys->sar[is16_9];

  589. 	

  590. 	size = sys->frame_size;

  591.     }

  592.     return size;

  593. }

  594. 

  595. /* 

  596.  * The following 6 functions constitute our interface to the world

  597.  */

  598. 

  599. int dv_assemble_frame(DVMuxContext *c, AVStream* st,

  600.                       const uint8_t* data, int data_size, uint8_t** frame)

  601. {

  602.     uint8_t pcm[8192];

  603.     int fsize, reqasize;

  604.    

  605.     *frame = &c->frame_buf[0];

  606.     if (c->has_audio && c->has_video) {  /* must be a stale frame */

  607.         dv_format_frame(c, *frame);

  608. 	c->frames++;

  609. 	c->has_audio = c->has_video = 0;

  610.     }

  611.     

  612.     if (st->codec.codec_type == CODEC_TYPE_VIDEO) {

  613.         /* FIXME: we have to have more sensible approach than this one */

  614. 	if (c->has_video)

  615. 	    av_log(&st->codec, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient audio data or severe sync problem.\n", c->frames);

  616. 	    

  617.         dv_inject_video(c, data, *frame);

  618. 	c->has_video = 1;

  619. 	data_size = 0;

  620.     } 

  621.     

  622.     reqasize = 4 * dv_audio_frame_size(c->sys, c->frames);

  623.     fsize = fifo_size(&c->audio_data, c->audio_data.rptr);

  624.     if (st->codec.codec_type == CODEC_TYPE_AUDIO || (c->has_video && fsize >= reqasize)) { 

  625. 	if (fsize + data_size >= reqasize && !c->has_audio) {

  626.             if (fsize >= reqasize) {

  627. 	        fifo_read(&c->audio_data, &pcm[0], reqasize, &c->audio_data.rptr);

  628.             } else {

  629. 	        fifo_read(&c->audio_data, &pcm[0], fsize, &c->audio_data.rptr);

  630.                 memcpy(&pcm[fsize], &data[0], reqasize - fsize);

  631. 		data += reqasize - fsize;

  632. 		data_size -= reqasize - fsize;

  633. 	    }

  634. 	    dv_inject_audio(c, &pcm[0], *frame);

  635. 	    c->has_audio = 1;

  636. 	}

  637.     

  638.         /* FIXME: we have to have more sensible approach than this one */

  639.         if (fifo_size(&c->audio_data, c->audio_data.rptr) + data_size >= 100*AVCODEC_MAX_AUDIO_FRAME_SIZE)

  640. 	    av_log(&st->codec, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient video data or severe sync problem.\n", c->frames);

  641. 	fifo_write(&c->audio_data, (uint8_t *)data, data_size, &c->audio_data.wptr);

  642.     }

  643. 

  644.     return (c->has_audio && c->has_video) ? c->sys->frame_size : 0;

  645. }

  646. 

  647. DVMuxContext* dv_init_mux(AVFormatContext* s)

  648. {

  649.     DVMuxContext *c;

  650.     AVStream *vst;

  651.     AVStream *ast;

  652. 

  653.     c = av_mallocz(sizeof(DVMuxContext));

  654.     if (!c)

  655.         return NULL;

  656. 

  657.     if (s->nb_streams != 2)

  658.         goto bail_out;

  659. 

  660.     /* We have to sort out where audio and where video stream is */

  661.     if (s->streams[0]->codec.codec_type == CODEC_TYPE_VIDEO &&

  662.         s->streams[1]->codec.codec_type == CODEC_TYPE_AUDIO) {

  663.        vst = s->streams[0];

  664.        ast = s->streams[1];

  665.     }

  666.     else if (s->streams[1]->codec.codec_type == CODEC_TYPE_VIDEO &&

  667.              s->streams[0]->codec.codec_type == CODEC_TYPE_AUDIO) {

  668.            vst = s->streams[1];

  669.            ast = s->streams[0];

  670.     } else

  671.         goto bail_out;

  672.   

  673.     /* Some checks -- DV format is very picky about its incoming streams */

  674.     if (vst->codec.codec_id != CODEC_ID_DVVIDEO ||

  675. 	ast->codec.codec_id != CODEC_ID_PCM_S16LE)

  676.        goto bail_out;

  677.     if (ast->codec.sample_rate != 48000 ||

  678. 	ast->codec.channels != 2)

  679.        goto bail_out;

  680. 

  681.     c->sys = dv_codec_profile(&vst->codec);

  682.     if (!c->sys)

  683. 	goto bail_out;

  684.     

  685.     /* Ok, everything seems to be in working order */

  686.     c->frames = 0;

  687.     c->has_audio = c->has_video = 0;

  688.     c->start_time = (time_t)s->timestamp;

  689.     c->aspect = 0; /* 4:3 is the default */

  690.     if ((int)(av_q2d(vst->codec.sample_aspect_ratio) * vst->codec.width / vst->codec.height * 10) == 17) /* 16:9 */ 

  691.         c->aspect = 0x07;

  692. 

  693.     if (fifo_init(&c->audio_data, 100*AVCODEC_MAX_AUDIO_FRAME_SIZE) < 0)

  694.         goto bail_out;

  695. 

  696.     dv_format_frame(c, &c->frame_buf[0]);

  697. 

  698.     return c;

  699.     

  700. bail_out:

  701.     av_free(c);

  702.     return NULL;

  703. }

  704. 

  705. void dv_delete_mux(DVMuxContext *c)

  706. {    

  707.     fifo_free(&c->audio_data);

  708. }

  709. 

  710. DVDemuxContext* dv_init_demux(AVFormatContext *s)

  711. {

  712.     DVDemuxContext *c;

  713. 

  714.     c = av_mallocz(sizeof(DVDemuxContext));

  715.     if (!c)

  716.         return NULL;

  717. 

  718.     c->vst = av_new_stream(s, 0);

  719.     c->ast[0] = av_new_stream(s, 0);

  720.     if (!c->vst || !c->ast[0])

  721.         goto fail;

  722.     c->fctx = s;

  723.     c->ast[1] = NULL;

  724.     c->ach = 0;

  725.     c->frames = 0;

  726.     c->abytes = 0;

  727.     c->audio_pkt[0].size = 0;

  728.     c->audio_pkt[1].size = 0;

  729.     

  730.     c->vst->codec.codec_type = CODEC_TYPE_VIDEO;

  731.     c->vst->codec.codec_id = CODEC_ID_DVVIDEO;

  732.     c->vst->codec.bit_rate = 25000000;

  733.     

  734.     c->ast[0]->codec.codec_type = CODEC_TYPE_AUDIO;

  735.     c->ast[0]->codec.codec_id = CODEC_ID_PCM_S16LE;

  736.    

  737.     s->ctx_flags |= AVFMTCTX_NOHEADER; 

  738.     

  739.     av_set_pts_info(s, 64, 1, 30000);

  740.     

  741.     return c;

  742.     

  743. fail:

  744.     if (c->vst)

  745.         av_free(c->vst);

  746.     if (c->ast[0])

  747.         av_free(c->ast[0]);

  748.     av_free(c);

  749.     return NULL;

  750. }

  751. 

  752. static void __destruct_pkt(struct AVPacket *pkt)

  753. {

  754.     pkt->data = NULL; pkt->size = 0;

  755.     return;

  756. }

  757. 

  758. int dv_get_packet(DVDemuxContext *c, AVPacket *pkt)

  759. {

  760.     int size = -1;

  761.     int i;

  762. 

  763.     for (i=0; i<c->ach; i++) {

  764.        if (c->ast[i] && c->audio_pkt[i].size) {

  765.            *pkt = c->audio_pkt[i];

  766. 	   c->audio_pkt[i].size = 0;

  767. 	   size = pkt->size;

  768. 	   break;

  769.        }

  770.     }

  771. 

  772.     return size;

  773. }

  774. 

  775. int dv_produce_packet(DVDemuxContext *c, AVPacket *pkt, 

  776.                       uint8_t* buf, int buf_size)

  777. {

  778.     int size, i;

  779.     const DVprofile* sys = dv_frame_profile(buf);

  780.    

  781.     if (buf_size < 4 || buf_size < sys->frame_size)

  782.         return -1;   /* Broken frame, or not enough data */

  783. 

  784.     /* Queueing audio packet */

  785.     /* FIXME: in case of no audio/bad audio we have to do something */

  786.     size = dv_extract_audio_info(c, buf);

  787.     c->audio_pkt[0].data = c->audio_pkt[1].data = NULL;

  788.     for (i=0; i<c->ach; i++) {

  789.        if (av_new_packet(&c->audio_pkt[i], size) < 0)

  790.            return AVERROR_NOMEM;

  791.        c->audio_pkt[i].stream_index = c->ast[i]->index;

  792.        c->audio_pkt[i].pts = c->abytes * 30000*8 / c->ast[i]->codec.bit_rate;

  793.        c->audio_pkt[i].flags |= PKT_FLAG_KEY;

  794.     }

  795.     dv_extract_audio(buf, c->audio_pkt[0].data, c->audio_pkt[1].data);

  796.     c->abytes += size;

  797.     

  798.     /* Now it's time to return video packet */

  799.     size = dv_extract_video_info(c, buf);

  800.     av_init_packet(pkt);

  801.     pkt->destruct = __destruct_pkt;

  802.     pkt->data     = buf;

  803.     pkt->size     = size; 

  804.     pkt->flags   |= PKT_FLAG_KEY;

  805.     pkt->stream_index = c->vst->id;

  806.     pkt->pts      = c->frames * sys->frame_rate_base * (30000/sys->frame_rate);

  807.     

  808.     c->frames++;

  809. 

  810.     return size;

  811. }

  812.                            

  813. int64_t dv_frame_offset(DVDemuxContext *c, int64_t timestamp)

  814. {

  815.     const DVprofile* sys = dv_codec_profile(&c->vst->codec);

  816. 

  817.     return sys->frame_size * ((timestamp * sys->frame_rate) / 

  818. 	                      (AV_TIME_BASE * sys->frame_rate_base));

  819. }

  820. 

  821. /************************************************************

  822.  * Implementation of the easiest DV storage of all -- raw DV.

  823.  ************************************************************/

  824.  

  825. typedef struct RawDVContext {

  826.     uint8_t         buf[144000];

  827.     DVDemuxContext* dv_demux;

  828. } RawDVContext;

  829. 

  830. static int dv_read_header(AVFormatContext *s,

  831.                           AVFormatParameters *ap)

  832. {

  833.     RawDVContext *c = s->priv_data;

  834.     c->dv_demux = dv_init_demux(s);

  835.    

  836.     return c->dv_demux ? 0 : -1;

  837. }

  838. 

  839. 

  840. static int dv_read_packet(AVFormatContext *s, AVPacket *pkt)

  841. {

  842.     int size;

  843.     RawDVContext *c = s->priv_data; 

  844.   

  845.     size = dv_get_packet(c->dv_demux, pkt);

  846.     

  847.     if (size < 0) {

  848.         if (get_buffer(&s->pb, c->buf, 4) <= 0) 

  849.             return -EIO;

  850.     

  851.         size = dv_frame_profile(c->buf)->frame_size;

  852.         if (get_buffer(&s->pb, c->buf + 4, size - 4) <= 0)

  853. 	    return -EIO;

  854. 

  855. 	size = dv_produce_packet(c->dv_demux, pkt, c->buf, size);

  856.     } 

  857.     

  858.     return size;

  859. }

  860. 

  861. static int dv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp)

  862. {

  863.     RawDVContext *c = s->priv_data;

  864. 

  865.     return url_fseek(&s->pb, dv_frame_offset(c->dv_demux, timestamp), SEEK_SET);

  866. }

  867. 

  868. static int dv_read_close(AVFormatContext *s)

  869. {

  870.     RawDVContext *c = s->priv_data;

  871.     av_free(c->dv_demux);

  872.     return 0;

  873. }

  874. 

  875. static int dv_write_header(AVFormatContext *s)

  876. {

  877.     s->priv_data = dv_init_mux(s);

  878.     if (!s->priv_data) {

  879.         av_log(s, AV_LOG_ERROR, "Can't initialize DV format!\n"

  880. 		    "Make sure that you supply exactly two streams:\n"

  881. 		    "     video: 25fps or 29.97fps, audio: 2ch/48Khz/PCM\n");

  882. 	return -1;

  883.     }

  884.     return 0;

  885. }

  886. 

  887. static int dv_write_packet(struct AVFormatContext *s, 

  888.                            int stream_index,

  889.                            const uint8_t *buf, int size, int64_t pts)

  890. {

  891.     uint8_t* frame;

  892.     int fsize;

  893.    

  894.     fsize = dv_assemble_frame((DVMuxContext *)s->priv_data, s->streams[stream_index],

  895.                               buf, size, &frame);

  896.     if (fsize > 0) {

  897.         put_buffer(&s->pb, frame, fsize); 

  898.         put_flush_packet(&s->pb);

  899.     } 

  900.     return 0;

  901. }

  902. 

  903. /* 

  904.  * We might end up with some extra A/V data without matching counterpart.

  905.  * E.g. video data without enough audio to write the complete frame.

  906.  * Currently we simply drop the last frame. I don't know whether this 

  907.  * is the best strategy of all

  908.  */

  909. static int dv_write_trailer(struct AVFormatContext *s)

  910. {

  911.     dv_delete_mux((DVMuxContext *)s->priv_data);

  912.     return 0;

  913. }

  914. 

  915. static AVInputFormat dv_iformat = {

  916.     "dv",

  917.     "DV video format",

  918.     sizeof(RawDVContext),

  919.     NULL,

  920.     dv_read_header,

  921.     dv_read_packet,

  922.     dv_read_close,

  923.     dv_read_seek,

  924.     .extensions = "dv,dif",

  925. };

  926. 

  927. static AVOutputFormat dv_oformat = {

  928.     "dv",

  929.     "DV video format",

  930.     NULL,

  931.     "dv",

  932.     sizeof(DVMuxContext),

  933.     CODEC_ID_PCM_S16LE,

  934.     CODEC_ID_DVVIDEO,

  935.     dv_write_header,

  936.     dv_write_packet,

  937.     dv_write_trailer,

  938. };

  939. 

  940. int ff_dv_init(void)

  941. {

  942.     av_register_input_format(&dv_iformat);

  943.     av_register_output_format(&dv_oformat);

  944.     return 0;

  945. }