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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. 

  29. typedef struct DVDemuxContext {

  30.     AVPacket  audio_pkt;

  31.     AVStream  *vst;

  32.     AVStream  *ast;

  33. } DVDemuxContext;

  34. 

  35. typedef struct DVMuxContext {

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

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

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

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

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

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

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

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

  44. } DVMuxContext;

  45. 

  46. enum dv_section_type {

  47.      dv_sect_header  = 0x1f,

  48.      dv_sect_subcode = 0x3f,

  49.      dv_sect_vaux    = 0x56,

  50.      dv_sect_audio   = 0x76,

  51.      dv_sect_video   = 0x96,

  52. };

  53. 

  54. enum dv_pack_type {

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

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

  57.      dv_timecode      = 0x13,

  58.      dv_audio_source  = 0x50,

  59.      dv_audio_control = 0x51,

  60.      dv_audio_recdate = 0x52,

  61.      dv_audio_rectime = 0x53,

  62.      dv_video_source  = 0x60,

  63.      dv_video_control = 0x61,

  64.      dv_viedo_recdate = 0x62,

  65.      dv_video_rectime = 0x63,

  66.      dv_unknown_pack  = 0xff,

  67. };

  68. 

  69. 

  70. 

  71. /*

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

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

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

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

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

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

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

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

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

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

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

  83.  */

  84. 

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

  86.     { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },

  87.     { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },

  88.     { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },

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

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

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

  92.     { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },

  93.     { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },

  94.     { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },

  95.     { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },

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

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

  98. };

  99. 

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

  101.     { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 

  102.       0x60, 0x61, 0x62, 0x63, 0xff, 0xff },

  103.     { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  125. };

  126. 

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

  128.     { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },

  129.     { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },

  130.     { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },

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

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

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

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

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

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

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

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

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

  140. };

  141. 

  142. static inline uint16_t dv_audio_12to16(uint16_t sample)

  143. {

  144.     uint16_t shift, result;

  145.     

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

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

  148. 

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

  150. 	result = sample;

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

  152.         shift--;

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

  154.     } else {

  155. 	shift = 0xe - shift;

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

  157.     }

  158. 

  159.     return result;

  160. }

  161. 

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

  163. {

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

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

  166. }

  167. 

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

  169. {

  170.     struct tm tc;

  171.     time_t ct;

  172.     int ltc_frame;

  173. 

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

  175.     switch (pack_id) {

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

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

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

  179. 	           (0 & 0x07);          /* APT: Track application ID */

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

  181. 	           (0x0f << 3) | /* reserved -- always 1 */

  182. 		   (0 & 0x07);   /* AP1: Audio application ID */

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

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

  185. 		   (0 & 0x07);   /* AP2: Video application ID */

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

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

  188. 		   (0 & 0x07);   /* AP3: Subcode application ID */

  189. 	  break;

  190.     case dv_timecode:

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

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

  193.           localtime_r(&ct, &tc);

  194.           /* 

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

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

  197.            */

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

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

  200. 		   (1 << 6) | /* Drop frame timecode: 0 - nondrop; 1 - drop */

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

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

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

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

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

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

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

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

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

  210. 		   (1 << 6) | /* Binary group flag BGF1 */

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

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

  213.           break;

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

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

  216.                    (1 << 6) | /* reserved -- always 1 */

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

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

  219. 	                      /* # of samples      */

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

  221.                    (0 << 5) | /* #of audio channels per block: 0 -- 1 channel */

  222.                    (0 << 4) | /* pair bit: 0 -- one pair of channels */

  223. 	            0;        /* audio mode        */

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

  225.                    (1 << 6) | /* multi-language flag */

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

  227. 	            0;        /* definition: 0 -- SD (525/625) */

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

  229.                    (0 << 6) | /* emphasis time constant: 0 -- reserved */

  230. 	           (0 << 3) | /* frequency: 0 -- 48Khz, 1 -- 44,1Khz, 2 -- 32Khz */

  231.                     0;        /* quantization: 0 -- 16bit linear, 1 -- 12bit nonlinear */			    

  232.           break;

  233.     case dv_audio_control:

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

  235.                    (1 << 4) | /* input source: 1 -- digital input */

  236. 	           (3 << 2) | /* compression: 3 -- no information */

  237. 	            0;        /* misc. info/SMPTE emphasis off */

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

  239.                    (1 << 6) | /* recording end point: 1 -- no */

  240. 	           (1 << 3) | /* recording mode: 1 -- original */

  241. 	            7;         

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

  243.                     0x20;     /* speed */

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

  245.                     0x7f;     /* genre category */

  246. 	  break;

  247.     case dv_audio_recdate:

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

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

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

  251.           localtime_r(&ct, &tc);

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

  253. 	                 /* 0xff is very likely to be "unknown" */

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

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

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

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

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

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

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

  261.           break;

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

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

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

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

  266.           localtime_r(&ct, &tc);

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

  268. 		   0x3f; /* tens of frame, units of frame: 0x3f - "unknown" ? */

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

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

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

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

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

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

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

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

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

  278. 	  break;

  279.     case dv_video_source:

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

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

  282. 		   (1 << 6) | /* following CLF is valid - 0, invalid - 1 */

  283. 		   (3 << 4) | /* CLF: color frames id (see ITU-R BT.470-4) */

  284. 		   0xf; /* reserved -- always 1 */

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

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

  287. 		   0; /* signal type video compression */

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

  289.           break;

  290.     case dv_video_control:

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

  292. 		   0x3f; /* reserved -- always 1 */

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

  294. 		   c->aspect;

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

  296. 		   (1 << 6) | /* First/second field flag 0 -- field 2, 1 -- field 1 */

  297. 		   (1 << 5) | /* Frame change flag 0 -- same picture as before, 1 -- different */

  298. 		   (1 << 4) | /* 1 - interlaced, 0 - noninterlaced */

  299. 		   0xc; /* reserved -- always b1100 */

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

  301.           break;

  302.     default:

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

  304.     }

  305.     return 5;

  306. }

  307. 

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

  309.                                   uint8_t dif_num, uint8_t* buf)

  310. {

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

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

  313. 	     (0 << 3) |     /* FSC: for 50Mb/s 0 - first channel; 1 - second */

  314. 	     7;             /* reserved -- always 1 */

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

  316.     return 3;

  317. }

  318. 

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

  320. {

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

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

  323. 		 (0<<4)  | /* AP3 (Subcode application ID) */

  324. 		 0x0f;     /* reserved -- always 1 */

  325.     } 

  326.     else if (syb_num == 11) {

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

  328.                  0x7f;     /* reserved -- always 1 */

  329.     }

  330.     else {

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

  332.                  (0<<4)  | /* APT (Track application ID) */

  333. 		 0x0f;     /* reserved -- always 1 */

  334.     }

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

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

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

  338.     return 3;

  339. }

  340. 

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

  342. {

  343.     int i, j, k;

  344.     

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

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

  347.        

  348.        /* DV header: 1DIF */

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

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

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

  352. 				   

  353.        /* DV subcode: 2DIFs */

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

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

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

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

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

  359. 	  }

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

  361.        }

  362.        

  363.        /* DV VAUX: 3DIFs */

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

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

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

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

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

  369.        } 

  370.        

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

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

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

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

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

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

  377. 	    }

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

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

  380. 			                       4 * 14 bytes Y 8x8 data

  381. 			                           10 bytes Cr 8x8 data

  382. 						   10 bytes Cb 8x8 data */

  383.        }

  384.     }

  385. }

  386. 

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

  388. {

  389.     int i, j, d, of;

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

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

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

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

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

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

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

  397.           }

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

  399.        }

  400.     }

  401. }

  402. 

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

  404. {

  405.     int i, j;

  406.     int ptr = 0;

  407. 

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

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

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

  411.             if (j%15 == 0)

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

  413. 	    ptr += 3;

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

  415. 	    ptr += 77;

  416.        }

  417.     }

  418. }

  419. 

  420. /* 

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

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

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

  424.  */

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

  426. {

  427.     int offs;

  428.     

  429.     switch (t) {

  430.     case dv_audio_source:

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

  432. 	  break;

  433.     case dv_audio_control:

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

  435. 	  break;

  436.     case dv_video_control:

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

  438.           break;

  439.     default:

  440.           return NULL;

  441.     }   

  442. 

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

  444. }

  445. 

  446. /* 

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

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

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

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

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

  452.  *    are converted into 16bit linear ones.

  453.  */

  454. static int dv_extract_audio(uint8_t* frame, uint8_t* pcm)

  455. {

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

  457.     uint16_t lc, rc;

  458.     const DVprofile* sys;

  459.     const uint8_t* as_pack;

  460.     

  461.     as_pack = dv_extract_pack(frame, dv_audio_source);

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

  463. 	return 0;

  464.    

  465.     sys = dv_frame_profile(frame);

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

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

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

  469.     

  470.     if (quant > 1)

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

  472. 

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

  474. 

  475.     /* for each DIF segment */

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

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

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

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

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

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

  482.                  if (of*2 >= size)

  483. 		     continue;

  484. 		 

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

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

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

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

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

  490. 		 if (i >= sys->difseg_size/2)

  491. 	             goto out;  /* We're not doing 4ch at this time */

  492. 		       

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

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

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

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

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

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

  499. 

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

  501.                  if (of*2 >= size)

  502. 		     continue;

  503. 

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

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

  506. 		 of = sys->audio_shuffle[i+sys->difseg_size/2][j] + 

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

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

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

  510. 		 ++d;

  511. 	      }

  512. 	  }

  513. 		

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

  515.         }

  516.     }

  517. 

  518. out:

  519.     return size;

  520. }

  521. 

  522. static int dv_extract_audio_info(uint8_t* frame, AVCodecContext* avctx)

  523. {

  524.     const uint8_t* as_pack;

  525.     const DVprofile* sys;

  526.     int freq, smpls;

  527. 

  528.     sys = dv_frame_profile(frame);

  529.     as_pack = dv_extract_pack(frame, dv_audio_source);

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

  531. 	return -1;

  532.     

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

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

  535.    

  536.     avctx->sample_rate = dv_audio_frequency[freq];

  537.     avctx->channels = 2;

  538.     avctx->bit_rate = avctx->channels * avctx->sample_rate * 16;

  539. 

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

  541. }

  542. 

  543. static int dv_extract_video_info(uint8_t* frame, AVCodecContext* avctx)

  544. {

  545.     const DVprofile* sys; 

  546.     const uint8_t* vsc_pack;

  547.     int apt;

  548.     int size = 0;

  549.     

  550.     sys = dv_frame_profile(frame);

  551.     if (sys) {

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

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

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

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

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

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

  558.         vsc_pack = dv_extract_pack(frame, dv_video_control);

  559.         if (vsc_pack && (vsc_pack[2] & 0x07) == (apt?0x02:0x07))

  560.             avctx->aspect_ratio = 16.0 / 9.0;

  561.         else

  562.             avctx->aspect_ratio = 4.0 / 3.0;

  563. 	size = sys->frame_size;

  564.     }

  565.     return size;

  566. }

  567. 

  568. /* 

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

  570.  */

  571. 

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

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

  574. {

  575.     uint8_t pcm[8192];

  576.     int fsize, reqasize;

  577.    

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

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

  580.         dv_format_frame(c, *frame);

  581. 	c->frames++;

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

  583.     }

  584.     

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

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

  587. 	if (c->has_video)

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

  589. 	    

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

  591. 	c->has_video = 1;

  592. 	data_size = 0;

  593.     } 

  594.     

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

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

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

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

  599.             if (fsize >= reqasize) {

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

  601.             } else {

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

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

  604. 		data += reqasize - fsize;

  605. 		data_size -= reqasize - fsize;

  606. 	    }

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

  608. 	    c->has_audio = 1;

  609. 	}

  610.     

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

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

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

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

  615.     }

  616. 

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

  618. }

  619. 

  620. DVMuxContext* dv_init_mux(AVFormatContext* s)

  621. {

  622.     DVMuxContext *c;

  623.     AVStream *vst;

  624.     AVStream *ast;

  625. 

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

  627.     if (!c)

  628.         return NULL;

  629. 

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

  631.         goto bail_out;

  632. 

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

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

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

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

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

  638.     }

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

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

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

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

  643.     } else

  644.         goto bail_out;

  645.   

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

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

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

  649.        goto bail_out;

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

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

  652.        goto bail_out;

  653. 

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

  655.     if (!c->sys)

  656. 	goto bail_out;

  657.     

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

  659.     c->frames = 0;

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

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

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

  663.     if (vst->codec.aspect_ratio == 16.0 / 9.0)

  664.         c->aspect = 0x07;

  665. 

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

  667.         goto bail_out;

  668. 

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

  670. 

  671.     return c;

  672.     

  673. bail_out:

  674.     av_free(c);

  675.     return NULL;

  676. }

  677. 

  678. void dv_delete_mux(DVMuxContext *c)

  679. {    

  680.     fifo_free(&c->audio_data);

  681. }

  682. 

  683. DVDemuxContext* dv_init_demux(AVFormatContext *s, int vid, int aid)

  684. {

  685.     DVDemuxContext *c;

  686. 

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

  688.     if (!c)

  689.         return NULL;

  690. 

  691.     c->vst = (vid < s->nb_streams) ? s->streams[vid] : av_new_stream(s, vid);

  692.     c->ast = (aid < s->nb_streams) ? s->streams[aid] : av_new_stream(s, aid);

  693.     if (!c->vst || !c->ast)

  694.         goto fail;

  695. 	

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

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

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

  699.     

  700.     c->ast->codec.codec_type = CODEC_TYPE_AUDIO;

  701.     c->ast->codec.codec_id = CODEC_ID_PCM_S16LE;

  702.     

  703.     c->audio_pkt.size = 0;

  704.     

  705.     return c;

  706.     

  707. fail:

  708.     if (c->vst)

  709.         av_free(c->vst);

  710.     if (c->ast)

  711.         av_free(c->ast);

  712.     av_free(c);

  713.     return NULL;

  714. }

  715. 

  716. static void __destruct_pkt(struct AVPacket *pkt)

  717. {

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

  719.     return;

  720. }

  721. 

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

  723. {

  724.     int size = -1;

  725. 

  726.     if (c->audio_pkt.size) {

  727.         *pkt = c->audio_pkt;

  728. 	c->audio_pkt.size = 0;

  729. 	size = pkt->size;

  730.     }

  731. 

  732.     return size;

  733. }

  734. 

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

  736.                       uint8_t* buf, int buf_size)

  737. {

  738.     int size;

  739.    

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

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

  742. 

  743.     /* Queueing audio packet */

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

  745.     size = dv_extract_audio_info(buf, &c->ast->codec);

  746.     if (av_new_packet(&c->audio_pkt, size) < 0)

  747.         return AVERROR_NOMEM;

  748.     dv_extract_audio(buf, c->audio_pkt.data);

  749.     c->audio_pkt.size = size;

  750.     c->audio_pkt.stream_index = c->ast->id;

  751.     

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

  753.     size = dv_extract_video_info(buf, &c->vst->codec);

  754.     av_init_packet(pkt);

  755.     pkt->destruct = __destruct_pkt;

  756.     pkt->data     = buf;

  757.     pkt->size     = size; 

  758.     pkt->flags   |= PKT_FLAG_KEY;

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

  760.     

  761.     return size;

  762. }

  763.                            

  764. /************************************************************

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

  766.  ************************************************************/

  767.  

  768. typedef struct RawDVContext {

  769.     void*     dv_demux;

  770.     uint8_t   buf[144000];

  771. } RawDVContext;

  772. 

  773. static int dv_read_header(AVFormatContext *s,

  774.                           AVFormatParameters *ap)

  775. {

  776.     RawDVContext *c = s->priv_data;

  777.     c->dv_demux = dv_init_demux(s, 0, 1);

  778.    

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

  780. }

  781. 

  782. 

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

  784. {

  785.     int size;

  786.     RawDVContext *c = s->priv_data; 

  787.   

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

  789.     

  790.     if (size < 0) {

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

  792.             return -EIO;

  793.     

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

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

  796. 	    return -EIO;

  797. 

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

  799.     } 

  800.     

  801.     return size;

  802. }

  803. 

  804. static int dv_read_close(AVFormatContext *s)

  805. {

  806.     RawDVContext *c = s->priv_data;

  807.     av_free(c->dv_demux);

  808.     return 0;

  809. }

  810. 

  811. static int dv_write_header(AVFormatContext *s)

  812. {

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

  814.     if (!s->priv_data) {

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

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

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

  818. 	return -1;

  819.     }

  820.     return 0;

  821. }

  822. 

  823. static int dv_write_packet(struct AVFormatContext *s, 

  824.                            int stream_index,

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

  826. {

  827.     uint8_t* frame;

  828.     int fsize;

  829.    

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

  831.                               buf, size, &frame);

  832.     if (fsize > 0) {

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

  834.         put_flush_packet(&s->pb);

  835.     } 

  836.     return fsize;

  837. }

  838. 

  839. /* 

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

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

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

  843.  * is the best strategy of all

  844.  */

  845. static int dv_write_trailer(struct AVFormatContext *s)

  846. {

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

  848.     return 0;

  849. }

  850. 

  851. static AVInputFormat dv_iformat = {

  852.     "dv",

  853.     "DV video format",

  854.     sizeof(RawDVContext),

  855.     NULL,

  856.     dv_read_header,

  857.     dv_read_packet,

  858.     dv_read_close,

  859.     .extensions = "dv",

  860. };

  861. 

  862. static AVOutputFormat dv_oformat = {

  863.     "dv",

  864.     "DV video format",

  865.     NULL,

  866.     "dv",

  867.     sizeof(DVMuxContext),

  868.     CODEC_ID_PCM_S16LE,

  869.     CODEC_ID_DVVIDEO,

  870.     dv_write_header,

  871.     dv_write_packet,

  872.     dv_write_trailer,

  873. };

  874. 

  875. int dv_init(void)

  876. {

  877.     av_register_input_format(&dv_iformat);

  878.     av_register_output_format(&dv_oformat);

  879.     return 0;

  880. }