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FFmpeg/libavformat/dvcore.c

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  1. /* 

  2.  * DV format muxer/demuxer

  3.  * Copyright (c) 2003 Roman Shaposhnik

  4.  *

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

  6.  * of DV technical info.

  7.  *

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

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

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

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

  12.  *

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

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

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

  16.  * Lesser General Public License for more details.

  17.  *

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

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

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

  21.  */

  22. #include "avformat.h"

  23. #include "dvcore.h"

  24. 

  25. /*

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

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

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

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

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

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

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

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

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

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

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

  37.  */

  38. 

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

  40.     { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },

  41.     { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },

  42.     { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },

  43.     { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },

  44.     { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },

  45.     { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },

  46.     { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },

  47.     { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },

  48.     { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },

  49.     { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },

  50.     { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },

  51.     { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },

  52. };

  53. 

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

  55.     { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 

  56.       0x60, 0x61, 0x62, 0x63, 0xff, 0xff },

  57.     { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 

  58.       0x60, 0x61, 0x62, 0x63, 0xff, 0xff },

  59.     { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 

  60.       0x60, 0x61, 0x62, 0x63, 0xff, 0xff },

  61.     { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 

  62.       0x60, 0x61, 0x62, 0x63, 0xff, 0xff },

  63.     { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 

  64.       0x60, 0x61, 0x62, 0x63, 0xff, 0xff },

  65.     { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 

  66.       0x60, 0x61, 0x62, 0x63, 0xff, 0xff },

  67.     { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 

  68.       0x60, 0x61, 0x62, 0x63, 0xff, 0xff },

  69.     { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 

  70.       0x60, 0x61, 0x62, 0x63, 0xff, 0xff },

  71.     { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 

  72.       0x60, 0x61, 0x62, 0x63, 0xff, 0xff },

  73.     { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 

  74.       0x60, 0x61, 0x62, 0x63, 0xff, 0xff },

  75.     { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 

  76.       0x60, 0x61, 0x62, 0x63, 0xff, 0xff },

  77.     { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 

  78.       0x60, 0x61, 0x62, 0x63, 0xff, 0xff },

  79. };

  80. 

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

  82.     { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },

  83.     { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },

  84.     { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },

  85.     { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },

  86.     { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },

  87.     { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },

  88.     { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },

  89.     { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },

  90.     { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },

  91.     { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },

  92.     { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },

  93.     { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },

  94. };

  95. 

  96. enum dv_section_type {

  97.      dv_sect_header  = 0x1f,

  98.      dv_sect_subcode = 0x3f,

  99.      dv_sect_vaux    = 0x56,

  100.      dv_sect_audio   = 0x76,

  101.      dv_sect_video   = 0x96,

  102. };

  103. 

  104. enum dv_pack_type {

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

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

  107.      dv_timecode      = 0x13,

  108.      dv_audio_source  = 0x50,

  109.      dv_audio_control = 0x51,

  110.      dv_audio_recdate = 0x52,

  111.      dv_audio_rectime = 0x53,

  112.      dv_video_source  = 0x60,

  113.      dv_video_control = 0x61,

  114.      dv_viedo_recdate = 0x62,

  115.      dv_video_rectime = 0x63,

  116.      dv_unknown_pack  = 0xff,

  117. };

  118. 

  119. static const uint16_t dv_audio_shuffle525[10][9] = {

  120.   {  0, 30, 60, 20, 50, 80, 10, 40, 70 }, /* 1st channel */

  121.   {  6, 36, 66, 26, 56, 86, 16, 46, 76 },

  122.   { 12, 42, 72,  2, 32, 62, 22, 52, 82 },

  123.   { 18, 48, 78,  8, 38, 68, 28, 58, 88 },

  124.   { 24, 54, 84, 14, 44, 74,  4, 34, 64 },

  125.   

  126.   {  1, 31, 61, 21, 51, 81, 11, 41, 71 }, /* 2nd channel */

  127.   {  7, 37, 67, 27, 57, 87, 17, 47, 77 },

  128.   { 13, 43, 73,  3, 33, 63, 23, 53, 83 },

  129.   { 19, 49, 79,  9, 39, 69, 29, 59, 89 },

  130.   { 25, 55, 85, 15, 45, 75,  5, 35, 65 },

  131. };

  132. 

  133. static const uint16_t dv_audio_shuffle625[12][9] = {

  134.   {   0,  36,  72,  26,  62,  98,  16,  52,  88}, /* 1st channel */

  135.   {   6,  42,  78,  32,  68, 104,  22,  58,  94},

  136.   {  12,  48,  84,   2,  38,  74,  28,  64, 100},

  137.   {  18,  54,  90,   8,  44,  80,  34,  70, 106},

  138.   {  24,  60,  96,  14,  50,  86,   4,  40,  76},  

  139.   {  30,  66, 102,  20,  56,  92,  10,  46,  82},

  140. 	

  141.   {   1,  37,  73,  27,  63,  99,  17,  53,  89}, /* 2nd channel */

  142.   {   7,  43,  79,  33,  69, 105,  23,  59,  95},

  143.   {  13,  49,  85,   3,  39,  75,  29,  65, 101},

  144.   {  19,  55,  91,   9,  45,  81,  35,  71, 107},

  145.   {  25,  61,  97,  15,  51,  87,   5,  41,  77},  

  146.   {  31,  67, 103,  21,  57,  93,  11,  47,  83},

  147. };

  148. 

  149. static const int dv_audio_frequency[3] = {

  150.     48000, 44100, 32000,

  151. };

  152.     

  153. const DVprofile dv_profiles[2] = {

  154.     { .dsf = 0,

  155.       .frame_size = 120000,        /* 525/60 system (NTSC) */

  156.       .difseg_size = 10,

  157.       .frame_rate = 30000,

  158.       .ltc_divisor = 30,

  159.       .frame_rate_base = 1001,

  160.       .height = 480,

  161. /*    .video_place = dv_place_411, */

  162.       .audio_stride = 90,

  163.       .audio_min_samples = { 1580, 1452, 1053 }, /* for 48, 44.1 and 32Khz */

  164.       .audio_samples_dist = { 1602, 1601, 1602, 1601, 1602 },

  165.       .audio_shuffle = dv_audio_shuffle525,

  166.     }, 

  167.     { .dsf = 1,

  168.       .frame_size = 144000,        /* 625/50 system (PAL) */

  169.       .difseg_size = 12,

  170.       .frame_rate = 25,

  171.       .frame_rate_base = 1,

  172.       .ltc_divisor = 25,

  173.       .height = 576,

  174. /*    .video_place = dv_place_420, */

  175.       .audio_stride = 108,

  176.       .audio_min_samples = { 1896, 1742, 1264 }, /* for 48, 44.1 and 32Khz */

  177.       .audio_samples_dist = { 1920, 1920, 1920, 1920, 1920 },

  178.       .audio_shuffle = dv_audio_shuffle525,

  179.      }

  180. };

  181. 

  182. static inline uint16_t dv_audio_12to16(uint16_t sample)

  183. {

  184.     uint16_t shift, result;

  185.     

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

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

  188. 

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

  190. 	result = sample;

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

  192.         shift--;

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

  194.     } else {

  195. 	shift = 0xe - shift;

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

  197.     }

  198. 

  199.     return result;

  200. }

  201. 

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

  203. {

  204.     struct tm tc;

  205.     time_t ct;

  206.     int ltc_frame;

  207. 

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

  209.     switch (pack_id) {

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

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

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

  213. 	           (0 & 0x07);          /* APT: Track application ID */

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

  215. 	           (0x0f << 3) | /* reserved -- always 1 */

  216. 		   (0 & 0x07);   /* AP1: Audio application ID */

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

  218. 	           (0x0f << 3) | /* reserved -- always 1 */

  219. 		   (0 & 0x07);   /* AP2: Video application ID */

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

  221. 	           (0x0f << 3) | /* reserved -- always 1 */

  222. 		   (0 & 0x07);   /* AP3: Subcode application ID */

  223. 	  break;

  224.     case dv_timecode:

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

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

  227.           localtime_r(&ct, &tc);

  228.           /* 

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

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

  231.            */

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

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

  234. 		   (1 << 6) | /* Drop frame timecode: 0 - nondrop; 1 - drop */

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

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

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

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

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

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

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

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

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

  244. 		   (1 << 6) | /* Binary group flag BGF1 */

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

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

  247.           break;

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

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

  250.                    (1 << 6) | /* reserved -- always 1 */

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

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

  253. 	                      /* # of samples      */

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

  255.                    (0 << 5) | /* #of audio channels per block: 0 -- 1 channel */

  256.                    (0 << 4) | /* pair bit: 0 -- one pair of channels */

  257. 	            0;        /* audio mode        */

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

  259.                    (1 << 6) | /* multi-language flag */

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

  261. 	            0;        /* definition: 0 -- SD (525/625) */

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

  263.                    (0 << 6) | /* emphasis time constant: 0 -- reserved */

  264. 	           (0 << 3) | /* frequency: 0 -- 48Khz, 1 -- 44,1Khz, 2 -- 32Khz */

  265.                     0;        /* quantization: 0 -- 16bit linear, 1 -- 12bit nonlinear */			    

  266.           break;

  267.     case dv_audio_control:

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

  269.                    (1 << 4) | /* input source: 1 -- digital input */

  270. 	           (3 << 2) | /* compression: 3 -- no information */

  271. 	            0;        /* misc. info/SMPTE emphasis off */

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

  273.                    (1 << 6) | /* recording end point: 1 -- no */

  274. 	           (1 << 3) | /* recording mode: 1 -- original */

  275. 	            7;         

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

  277.                     0x20;     /* speed */

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

  279.                     0x7f;     /* genre category */

  280. 	  break;

  281.     case dv_audio_recdate:

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

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

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

  285.           localtime_r(&ct, &tc);

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

  287. 	                 /* 0xff is very likely to be "unknown" */

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

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

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

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

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

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

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

  295.           break;

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

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

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

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

  300.           localtime_r(&ct, &tc);

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

  302. 		   0x3f; /* tens of frame, units of frame: 0x3f - "unknown" ? */

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

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

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

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

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

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

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

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

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

  312. 	  break;

  313.     case dv_video_source:

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

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

  316. 		   (1 << 6) | /* following CLF is valid - 0, invalid - 1 */

  317. 		   (3 << 4) | /* CLF: color frames id (see ITU-R BT.470-4) */

  318. 		   0xf; /* reserved -- always 1 */

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

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

  321. 		   0; /* signal type video compression */

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

  323.           break;

  324.     case dv_video_control:

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

  326. 		   0x3f; /* reserved -- always 1 */

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

  328. 		   c->aspect;

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

  330. 		   (1 << 6) | /* First/second field flag 0 -- field 2, 1 -- field 1 */

  331. 		   (1 << 5) | /* Frame change flag 0 -- same picture as before, 1 -- different */

  332. 		   (1 << 4) | /* 1 - interlaced, 0 - noninterlaced */

  333. 		   0xc; /* reserved -- always b1100 */

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

  335.           break;

  336.     default:

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

  338.     }

  339.     return 5;

  340. }

  341. 

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

  343.                                   uint8_t dif_num, uint8_t* buf)

  344. {

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

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

  347. 	     (0 << 3) |     /* FSC: for 50Mb/s 0 - first channel; 1 - second */

  348. 	     7;             /* reserved -- always 1 */

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

  350.     return 3;

  351. }

  352. 

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

  354. {

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

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

  357. 		 (0<<4)  | /* AP3 (Subcode application ID) */

  358. 		 0x0f;     /* reserved -- always 1 */

  359.     } 

  360.     else if (syb_num == 11) {

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

  362.                  0x7f;     /* reserved -- always 1 */

  363.     }

  364.     else {

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

  366.                  (0<<4)  | /* APT (Track application ID) */

  367. 		 0x0f;     /* reserved -- always 1 */

  368.     }

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

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

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

  372.     return 3;

  373. }

  374. 

  375. void dv_format_frame(DVMuxContext *c, uint8_t* buf)

  376. {

  377.     int i, j, k;

  378.     

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

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

  381.        

  382.        /* DV header: 1DIF */

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

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

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

  386. 				   

  387.        /* DV subcode: 2DIFs */

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

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

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

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

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

  393. 	  }

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

  395.        }

  396.        

  397.        /* DV VAUX: 3DIFs */

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

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

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

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

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

  403.        } 

  404.        

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

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

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

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

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

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

  411. 	    }

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

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

  414. 			                       4 * 14 bytes Y 8x8 data

  415. 			                           10 bytes Cr 8x8 data

  416. 						   10 bytes Cb 8x8 data */

  417.        }

  418.     }

  419. }

  420. 

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

  422. {

  423.     int i, j, d, of;

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

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

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

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

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

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

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

  431.           }

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

  433.        }

  434.     }

  435. }

  436. 

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

  438. {

  439.     int i, j;

  440.     int ptr = 0;

  441. 

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

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

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

  445.             if (j%15 == 0)

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

  447. 	    ptr += 3;

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

  449. 	    ptr += 77;

  450.        }

  451.     }

  452. }

  453. 

  454. int dv_audio_frame_size(const DVprofile* sys, int frame)

  455. {

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

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

  458. }

  459. 

  460. const DVprofile* dv_frame_profile(uint8_t* frame)

  461. {

  462.     return &dv_profiles[!!(frame[3] & 0x80)]; /* Header, DSF flag */

  463. }

  464. 

  465. /* 

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

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

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

  469.  */

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

  471. {

  472.     int offs;

  473.     

  474.     switch (t) {

  475.     case dv_audio_source:

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

  477. 	  break;

  478.     case dv_audio_control:

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

  480. 	  break;

  481.     case dv_video_control:

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

  483.           break;

  484.     default:

  485.           return NULL;

  486.     }   

  487. 

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

  489. }

  490. 

  491. /* 

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

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

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

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

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

  497.  *    are converted into 16bit linear ones.

  498.  */

  499. int dv_extract_audio(uint8_t* frame, uint8_t* pcm, AVCodecContext* avctx)

  500. {

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

  502.     uint16_t lc, rc;

  503.     const DVprofile* sys;

  504.     const uint8_t* as_pack;

  505.     

  506.     as_pack = dv_extract_pack(frame, dv_audio_source);

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

  508. 	return 0;

  509.    

  510.     sys = dv_frame_profile(frame);

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

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

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

  514.     

  515.     if (quant > 1)

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

  517. 

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

  519.     avctx->channels = 2;

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

  521.     // What about:

  522.     // avctx->frame_size =

  523.    

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

  525. 

  526.     /* for each DIF segment */

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

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

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

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

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

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

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

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

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

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

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

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

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

  540. 		       

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

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

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

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

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

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

  547. 

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

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

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

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

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

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

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

  555. 		 ++d;

  556. 	      }

  557. 	  }

  558. 		

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

  560.         }

  561.     }

  562. 

  563. out:

  564.     return size;

  565. }

  566. 

  567. /* FIXME: The following three functions could be underengineered ;-) */

  568. void dv_assemble_frame(DVMuxContext *c, const uint8_t* video, const uint8_t* audio, int asize)

  569. {

  570.     uint8_t pcm[8192];

  571.     uint8_t* frame = &c->frame_buf[0];

  572.     int fsize, reqasize;

  573.    

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

  575.         dv_format_frame(c, frame);

  576. 	c->frames++;

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

  578.     }

  579.     

  580.     if (video) {

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

  582. 	if (c->has_video)

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

  584. 	    

  585.         dv_inject_video(c, video, frame);

  586. 	c->has_video = 1;

  587.     } 

  588.     if (audio) {

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

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

  591. 	if (fsize + asize >= reqasize) {

  592.             if (fsize >= reqasize) {

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

  594.             } else {

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

  596.                 memcpy(&pcm[fsize], &audio[0], reqasize - fsize);

  597. 		audio += reqasize - fsize;

  598. 		asize -= reqasize - fsize;

  599. 	    }

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

  601. 	    c->has_audio = 1;

  602. 	}

  603.     

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

  605.         if (fifo_size(&c->audio_data, c->audio_data.rptr) + asize >= AVCODEC_MAX_AUDIO_FRAME_SIZE)

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

  607. 	fifo_write(&c->audio_data, (uint8_t *)audio, asize, &c->audio_data.wptr);

  608.     }

  609. }

  610. 

  611. int dv_core_init(DVMuxContext *c, AVStream *streams[])

  612. {

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

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

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

  616.        c->vst = 0;

  617.        c->ast = 1;

  618.     }

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

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

  621. 	    c->vst = 1;

  622.  	    c->ast = 0;

  623.     } else

  624.         goto bail_out;

  625.   

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

  627.     if (streams[c->vst]->codec.codec_id != CODEC_ID_DVVIDEO ||

  628. 	streams[c->ast]->codec.codec_id != CODEC_ID_PCM_S16LE)

  629.        goto bail_out;

  630.     if (streams[c->ast]->codec.sample_rate != 48000 ||

  631. 	streams[c->ast]->codec.channels != 2)

  632.        goto bail_out;

  633. 	

  634.     if (streams[c->vst]->codec.frame_rate == 25 &&

  635.         streams[c->vst]->codec.frame_rate_base == 1) {

  636.         /* May be we have to pick sys for every frame */

  637. 	c->sys = &dv_profiles[1];

  638.     }

  639.     else if (streams[c->vst]->codec.frame_rate == 30000 &&

  640.              streams[c->vst]->codec.frame_rate_base == 1001) {

  641. 	/* May be we have to pick sys for every frame */

  642. 	c->sys = &dv_profiles[0];

  643.     } else

  644.         goto bail_out;

  645.     

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

  647.     c->frames = 0;

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

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

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

  651.     if (streams[c->vst]->codec.aspect_ratio == 16.0 / 9.0)

  652.         c->aspect = 0x07;

  653. 

  654.     if (fifo_init(&c->audio_data, AVCODEC_MAX_AUDIO_FRAME_SIZE) < 0)

  655.         goto bail_out;

  656. 

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

  658. 

  659.     return 0;

  660.     

  661. bail_out:

  662.     return -1;

  663. }

  664. 

  665. void dv_core_delete(DVMuxContext *c)

  666. {    

  667.     fifo_free(&c->audio_data);

  668. }