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FFmpeg/libavformat/dv.c

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  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. };

  37. 

  38. struct DVMuxContext {

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

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

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

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

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

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

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

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

  47. };

  48. 

  49. enum dv_section_type {

  50.      dv_sect_header  = 0x1f,

  51.      dv_sect_subcode = 0x3f,

  52.      dv_sect_vaux    = 0x56,

  53.      dv_sect_audio   = 0x76,

  54.      dv_sect_video   = 0x96,

  55. };

  56. 

  57. enum dv_pack_type {

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

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

  60.      dv_timecode      = 0x13,

  61.      dv_audio_source  = 0x50,

  62.      dv_audio_control = 0x51,

  63.      dv_audio_recdate = 0x52,

  64.      dv_audio_rectime = 0x53,

  65.      dv_video_source  = 0x60,

  66.      dv_video_control = 0x61,

  67.      dv_viedo_recdate = 0x62,

  68.      dv_video_rectime = 0x63,

  69.      dv_unknown_pack  = 0xff,

  70. };

  71. 

  72. 

  73. 

  74. /*

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

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

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

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

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

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

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

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

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

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

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

  86.  */

  87. 

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

  89.     { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },

  90.     { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },

  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, 0x62, 0x63, 0x13, 0x62, 0x63 },

  96.     { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },

  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. };

  102. 

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

  104.     { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 

  105.       0x60, 0x61, 0x62, 0x63, 0xff, 0xff },

  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. };

  129. 

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

  131.     { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },

  132.     { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },

  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. };

  144. 

  145. static inline uint16_t dv_audio_12to16(uint16_t sample)

  146. {

  147.     uint16_t shift, result;

  148.     

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

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

  151. 

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

  153. 	result = sample;

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

  155.         shift--;

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

  157.     } else {

  158. 	shift = 0xe - shift;

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

  160.     }

  161. 

  162.     return result;

  163. }

  164. 

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

  166. {

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

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

  169. }

  170. 

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

  172. {

  173.     struct tm tc;

  174.     time_t ct;

  175.     int ltc_frame;

  176. 

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

  178.     switch (pack_id) {

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

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

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

  182. 	           (0 & 0x07);          /* APT: Track application ID */

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

  184. 	           (0x0f << 3) | /* reserved -- always 1 */

  185. 		   (0 & 0x07);   /* AP1: Audio application ID */

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

  187. 	           (0x0f << 3) | /* reserved -- always 1 */

  188. 		   (0 & 0x07);   /* AP2: Video application ID */

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

  190. 	           (0x0f << 3) | /* reserved -- always 1 */

  191. 		   (0 & 0x07);   /* AP3: Subcode application ID */

  192. 	  break;

  193.     case dv_timecode:

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

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

  196.           localtime_r(&ct, &tc);

  197.           /* 

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

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

  200.            */

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

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

  203. 		   (1 << 6) | /* Drop frame timecode: 0 - nondrop; 1 - drop */

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

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

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

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

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

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

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

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

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

  213. 		   (1 << 6) | /* Binary group flag BGF1 */

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

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

  216.           break;

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

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

  219.                    (1 << 6) | /* reserved -- always 1 */

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

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

  222. 	                      /* # of samples      */

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

  224.                    (0 << 5) | /* #of audio channels per block: 0 -- 1 channel */

  225.                    (0 << 4) | /* pair bit: 0 -- one pair of channels */

  226. 	            0;        /* audio mode        */

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

  228.                    (1 << 6) | /* multi-language flag */

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

  230. 	            0;        /* definition: 0 -- SD (525/625) */

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

  232.                    (0 << 6) | /* emphasis time constant: 0 -- reserved */

  233. 	           (0 << 3) | /* frequency: 0 -- 48Khz, 1 -- 44,1Khz, 2 -- 32Khz */

  234.                     0;        /* quantization: 0 -- 16bit linear, 1 -- 12bit nonlinear */			    

  235.           break;

  236.     case dv_audio_control:

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

  238.                    (1 << 4) | /* input source: 1 -- digital input */

  239. 	           (3 << 2) | /* compression: 3 -- no information */

  240. 	            0;        /* misc. info/SMPTE emphasis off */

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

  242.                    (1 << 6) | /* recording end point: 1 -- no */

  243. 	           (1 << 3) | /* recording mode: 1 -- original */

  244. 	            7;         

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

  246.                     0x20;     /* speed */

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

  248.                     0x7f;     /* genre category */

  249. 	  break;

  250.     case dv_audio_recdate:

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

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

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

  254.           localtime_r(&ct, &tc);

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

  256. 	                 /* 0xff is very likely to be "unknown" */

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

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

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

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

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

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

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

  264.           break;

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

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

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

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

  269.           localtime_r(&ct, &tc);

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

  271. 		   0x3f; /* tens of frame, units of frame: 0x3f - "unknown" ? */

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

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

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

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

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

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

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

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

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

  281. 	  break;

  282.     case dv_video_source:

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

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

  285. 		   (1 << 6) | /* following CLF is valid - 0, invalid - 1 */

  286. 		   (3 << 4) | /* CLF: color frames id (see ITU-R BT.470-4) */

  287. 		   0xf; /* reserved -- always 1 */

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

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

  290. 		   0; /* signal type video compression */

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

  292.           break;

  293.     case dv_video_control:

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

  295. 		   0x3f; /* reserved -- always 1 */

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

  297. 		   c->aspect;

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

  299. 		   (1 << 6) | /* First/second field flag 0 -- field 2, 1 -- field 1 */

  300. 		   (1 << 5) | /* Frame change flag 0 -- same picture as before, 1 -- different */

  301. 		   (1 << 4) | /* 1 - interlaced, 0 - noninterlaced */

  302. 		   0xc; /* reserved -- always b1100 */

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

  304.           break;

  305.     default:

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

  307.     }

  308.     return 5;

  309. }

  310. 

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

  312.                                   uint8_t dif_num, uint8_t* buf)

  313. {

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

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

  316. 	     (0 << 3) |     /* FSC: for 50Mb/s 0 - first channel; 1 - second */

  317. 	     7;             /* reserved -- always 1 */

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

  319.     return 3;

  320. }

  321. 

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

  323. {

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

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

  326. 		 (0<<4)  | /* AP3 (Subcode application ID) */

  327. 		 0x0f;     /* reserved -- always 1 */

  328.     } 

  329.     else if (syb_num == 11) {

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

  331.                  0x7f;     /* reserved -- always 1 */

  332.     }

  333.     else {

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

  335.                  (0<<4)  | /* APT (Track application ID) */

  336. 		 0x0f;     /* reserved -- always 1 */

  337.     }

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

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

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

  341.     return 3;

  342. }

  343. 

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

  345. {

  346.     int i, j, k;

  347.     

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

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

  350.        

  351.        /* DV header: 1DIF */

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

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

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

  355. 				   

  356.        /* DV subcode: 2DIFs */

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

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

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

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

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

  362. 	  }

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

  364.        }

  365.        

  366.        /* DV VAUX: 3DIFs */

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

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

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

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

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

  372.        } 

  373.        

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

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

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

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

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

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

  380. 	    }

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

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

  383. 			                       4 * 14 bytes Y 8x8 data

  384. 			                           10 bytes Cr 8x8 data

  385. 						   10 bytes Cb 8x8 data */

  386.        }

  387.     }

  388. }

  389. 

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

  391. {

  392.     int i, j, d, of;

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

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

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

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

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

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

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

  400.           }

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

  402.        }

  403.     }

  404. }

  405. 

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

  407. {

  408.     int i, j;

  409.     int ptr = 0;

  410. 

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

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

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

  414.             if (j%15 == 0)

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

  416. 	    ptr += 3;

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

  418. 	    ptr += 77;

  419.        }

  420.     }

  421. }

  422. 

  423. /* 

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

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

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

  427.  */

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

  429. {

  430.     int offs;

  431.     

  432.     switch (t) {

  433.     case dv_audio_source:

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

  435. 	  break;

  436.     case dv_audio_control:

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

  438. 	  break;

  439.     case dv_video_control:

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

  441.           break;

  442.     default:

  443.           return NULL;

  444.     }   

  445. 

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

  447. }

  448. 

  449. /* 

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

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

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

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

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

  455.  *    are converted into 16bit linear ones.

  456.  */

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

  458. {

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

  460.     uint16_t lc, rc;

  461.     const DVprofile* sys;

  462.     const uint8_t* as_pack;

  463.     

  464.     as_pack = dv_extract_pack(frame, dv_audio_source);

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

  466. 	return 0;

  467.    

  468.     sys = dv_frame_profile(frame);

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

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

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

  472.     

  473.     if (quant > 1)

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

  475. 

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

  477.     half_ch = sys->difseg_size/2;

  478. 

  479.     /* for each DIF segment */

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

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

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

  483.            if (!pcm2)

  484.                break;

  485.            else

  486.                pcm = pcm2;

  487.        }

  488. 

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

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

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

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

  493.                  if (of*2 >= size)

  494. 		     continue;

  495. 		 

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

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

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

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

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

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

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

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

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

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

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

  507. 

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

  509.                  if (of*2 >= size)

  510. 		     continue;

  511. 

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

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

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

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

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

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

  518. 		 ++d;

  519. 	      }

  520. 	  }

  521. 		

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

  523.         }

  524.     }

  525. 

  526.     return size;

  527. }

  528. 

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

  530. {

  531.     const uint8_t* as_pack;

  532.     const DVprofile* sys;

  533.     int freq, smpls, quant, i;

  534. 

  535.     sys = dv_frame_profile(frame);

  536.     as_pack = dv_extract_pack(frame, dv_audio_source);

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

  538.         c->ach = 0;

  539. 	return -1;

  540.     }

  541.     

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

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

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

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

  546. 

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

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

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

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

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

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

  553. 	} else

  554. 	    c->ach = 1;

  555.     }

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

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

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

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

  560.     }

  561.     

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

  563. }

  564. 

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

  566. {

  567.     const DVprofile* sys; 

  568.     const uint8_t* vsc_pack;

  569.     AVCodecContext* avctx;

  570.     int apt, is16_9;

  571.     int size = 0;

  572.     

  573.     sys = dv_frame_profile(frame);

  574.     if (sys) {

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

  576. 	

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

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

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

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

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

  582.         

  583. 	vsc_pack = dv_extract_pack(frame, dv_video_control);

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

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

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

  587. 	

  588. 	size = sys->frame_size;

  589.     }

  590.     return size;

  591. }

  592. 

  593. /* 

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

  595.  */

  596. 

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

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

  599. {

  600.     uint8_t pcm[8192];

  601.     int fsize, reqasize;

  602.    

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

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

  605.         dv_format_frame(c, *frame);

  606. 	c->frames++;

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

  608.     }

  609.     

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

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

  612. 	if (c->has_video)

  613. 	    fprintf(stderr, "Can't process DV frame #%d. Insufficient audio data or severe sync problem.\n", c->frames);

  614. 	    

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

  616. 	c->has_video = 1;

  617. 	data_size = 0;

  618.     } 

  619.     

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

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

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

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

  624.             if (fsize >= reqasize) {

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

  626.             } else {

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

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

  629. 		data += reqasize - fsize;

  630. 		data_size -= reqasize - fsize;

  631. 	    }

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

  633. 	    c->has_audio = 1;

  634. 	}

  635.     

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

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

  638. 	    fprintf(stderr, "Can't process DV frame #%d. Insufficient video data or severe sync problem.\n", c->frames);

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

  640.     }

  641. 

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

  643. }

  644. 

  645. DVMuxContext* dv_init_mux(AVFormatContext* s)

  646. {

  647.     DVMuxContext *c;

  648.     AVStream *vst;

  649.     AVStream *ast;

  650. 

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

  652.     if (!c)

  653.         return NULL;

  654. 

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

  656.         goto bail_out;

  657. 

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

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

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

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

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

  663.     }

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

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

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

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

  668.     } else

  669.         goto bail_out;

  670.   

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

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

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

  674.        goto bail_out;

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

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

  677.        goto bail_out;

  678. 

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

  680.     if (!c->sys)

  681. 	goto bail_out;

  682.     

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

  684.     c->frames = 0;

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

  686.     c->start_time = time(NULL);

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

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

  689.         c->aspect = 0x07;

  690. 

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

  692.         goto bail_out;

  693. 

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

  695. 

  696.     return c;

  697.     

  698. bail_out:

  699.     av_free(c);

  700.     return NULL;

  701. }

  702. 

  703. void dv_delete_mux(DVMuxContext *c)

  704. {    

  705.     fifo_free(&c->audio_data);

  706. }

  707. 

  708. DVDemuxContext* dv_init_demux(AVFormatContext *s)

  709. {

  710.     DVDemuxContext *c;

  711. 

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

  713.     if (!c)

  714.         return NULL;

  715. 

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

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

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

  719.         goto fail;

  720.     c->fctx = s;

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

  722.     c->ach = 0;

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

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

  725.     

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

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

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

  729.     

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

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

  732.    

  733.     s->ctx_flags |= AVFMTCTX_NOHEADER; 

  734.     

  735.     return c;

  736.     

  737. fail:

  738.     if (c->vst)

  739.         av_free(c->vst);

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

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

  742.     av_free(c);

  743.     return NULL;

  744. }

  745. 

  746. static void __destruct_pkt(struct AVPacket *pkt)

  747. {

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

  749.     return;

  750. }

  751. 

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

  753. {

  754.     int size = -1;

  755.     int i;

  756. 

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

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

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

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

  761. 	   size = pkt->size;

  762. 	   break;

  763.        }

  764.     }

  765. 

  766.     return size;

  767. }

  768. 

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

  770.                       uint8_t* buf, int buf_size)

  771. {

  772.     int size, i;

  773.    

  774.     if (buf_size < 4 || buf_size < dv_frame_profile(buf)->frame_size)

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

  776. 

  777.     /* Queueing audio packet */

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

  779.     size = dv_extract_audio_info(c, buf);

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

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

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

  783.            return AVERROR_NOMEM;

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

  785.     }

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

  787.     

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

  789.     size = dv_extract_video_info(c, buf);

  790.     av_init_packet(pkt);

  791.     pkt->destruct = __destruct_pkt;

  792.     pkt->data     = buf;

  793.     pkt->size     = size; 

  794.     pkt->flags   |= PKT_FLAG_KEY;

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

  796. 

  797.     return size;

  798. }

  799.                            

  800. /************************************************************

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

  802.  ************************************************************/

  803.  

  804. typedef struct RawDVContext {

  805.     uint8_t         buf[144000];

  806.     DVDemuxContext* dv_demux;

  807. } RawDVContext;

  808. 

  809. static int dv_read_header(AVFormatContext *s,

  810.                           AVFormatParameters *ap)

  811. {

  812.     RawDVContext *c = s->priv_data;

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

  814.    

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

  816. }

  817. 

  818. 

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

  820. {

  821.     int size;

  822.     RawDVContext *c = s->priv_data; 

  823.   

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

  825.     

  826.     if (size < 0) {

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

  828.             return -EIO;

  829.     

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

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

  832. 	    return -EIO;

  833. 

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

  835.     } 

  836.     

  837.     return size;

  838. }

  839. 

  840. static int dv_read_close(AVFormatContext *s)

  841. {

  842.     RawDVContext *c = s->priv_data;

  843.     av_free(c->dv_demux);

  844.     return 0;

  845. }

  846. 

  847. static int dv_write_header(AVFormatContext *s)

  848. {

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

  850.     if (!s->priv_data) {

  851.         fprintf(stderr, "Can't initialize DV format!\n"

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

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

  854. 	return -1;

  855.     }

  856.     return 0;

  857. }

  858. 

  859. static int dv_write_packet(struct AVFormatContext *s, 

  860.                            int stream_index,

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

  862. {

  863.     uint8_t* frame;

  864.     int fsize;

  865.    

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

  867.                               buf, size, &frame);

  868.     if (fsize > 0) {

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

  870.         put_flush_packet(&s->pb);

  871.     } 

  872.     return fsize;

  873. }

  874. 

  875. /* 

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

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

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

  879.  * is the best strategy of all

  880.  */

  881. static int dv_write_trailer(struct AVFormatContext *s)

  882. {

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

  884.     return 0;

  885. }

  886. 

  887. static AVInputFormat dv_iformat = {

  888.     "dv",

  889.     "DV video format",

  890.     sizeof(RawDVContext),

  891.     NULL,

  892.     dv_read_header,

  893.     dv_read_packet,

  894.     dv_read_close,

  895.     .extensions = "dv",

  896. };

  897. 

  898. static AVOutputFormat dv_oformat = {

  899.     "dv",

  900.     "DV video format",

  901.     NULL,

  902.     "dv",

  903.     sizeof(DVMuxContext),

  904.     CODEC_ID_PCM_S16LE,

  905.     CODEC_ID_DVVIDEO,

  906.     dv_write_header,

  907.     dv_write_packet,

  908.     dv_write_trailer,

  909. };

  910. 

  911. int dv_init(void)

  912. {

  913.     av_register_input_format(&dv_iformat);

  914.     av_register_output_format(&dv_oformat);

  915.     return 0;

  916. }