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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.     uint8_t          audio_buf[2][8192];

  36.     int              ach;

  37.     int              frames;

  38.     uint64_t         abytes;

  39. };

  40. 

  41. struct DVMuxContext {

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

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

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

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

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

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

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

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

  50. };

  51. 

  52. enum dv_section_type {

  53.      dv_sect_header  = 0x1f,

  54.      dv_sect_subcode = 0x3f,

  55.      dv_sect_vaux    = 0x56,

  56.      dv_sect_audio   = 0x76,

  57.      dv_sect_video   = 0x96,

  58. };

  59. 

  60. enum dv_pack_type {

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

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

  63.      dv_timecode      = 0x13,

  64.      dv_audio_source  = 0x50,

  65.      dv_audio_control = 0x51,

  66.      dv_audio_recdate = 0x52,

  67.      dv_audio_rectime = 0x53,

  68.      dv_video_source  = 0x60,

  69.      dv_video_control = 0x61,

  70.      dv_viedo_recdate = 0x62,

  71.      dv_video_rectime = 0x63,

  72.      dv_unknown_pack  = 0xff,

  73. };

  74. 

  75. 

  76. 

  77. /*

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

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

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

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

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

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

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

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

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

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

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

  89.  */

  90. 

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

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

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

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

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

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

  97.     { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },

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

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

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

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

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

  103.     { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },

  104. };

  105. 

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

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

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

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

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

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

  130.       0x60, 0x61, 0x62, 0x63, 0xff, 0xff },

  131. };

  132. 

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

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

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

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

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

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

  145.     { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },

  146. };

  147. 

  148. static inline uint16_t dv_audio_12to16(uint16_t sample)

  149. {

  150.     uint16_t shift, result;

  151.     

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

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

  154. 

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

  156. 	result = sample;

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

  158.         shift--;

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

  160.     } else {

  161. 	shift = 0xe - shift;

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

  163.     }

  164. 

  165.     return result;

  166. }

  167. 

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

  169. {

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

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

  172. }

  173. 

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

  175. {

  176.     struct tm tc;

  177.     time_t ct;

  178.     int ltc_frame;

  179. 

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

  181.     switch (pack_id) {

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

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

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

  185. 	           (0 & 0x07);          /* APT: Track application ID */

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

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

  188. 		   (0 & 0x07);   /* AP1: Audio application ID */

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

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

  191. 		   (0 & 0x07);   /* AP2: Video application ID */

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

  193. 	           (0x0f << 3) | /* reserved -- always 1 */

  194. 		   (0 & 0x07);   /* AP3: Subcode application ID */

  195. 	  break;

  196.     case dv_timecode:

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

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

  199.           brktimegm(ct, &tc);

  200.           /* 

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

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

  203.            */

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

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

  206. 		   (1 << 6) | /* Drop frame timecode: 0 - nondrop; 1 - drop */

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

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

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

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

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

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

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

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

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

  216. 		   (1 << 6) | /* Binary group flag BGF1 */

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

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

  219.           break;

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

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

  222.                    (1 << 6) | /* reserved -- always 1 */

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

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

  225. 	                      /* # of samples      */

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

  227.                    (0 << 5) | /* #of audio channels per block: 0 -- 1 channel */

  228.                    (0 << 4) | /* pair bit: 0 -- one pair of channels */

  229. 	            0;        /* audio mode        */

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

  231.                    (1 << 6) | /* multi-language flag */

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

  233. 	            0;        /* definition: 0 -- SD (525/625) */

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

  235.                    (0 << 6) | /* emphasis time constant: 0 -- reserved */

  236. 	           (0 << 3) | /* frequency: 0 -- 48Khz, 1 -- 44,1Khz, 2 -- 32Khz */

  237.                     0;        /* quantization: 0 -- 16bit linear, 1 -- 12bit nonlinear */			    

  238.           break;

  239.     case dv_audio_control:

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

  241.                    (1 << 4) | /* input source: 1 -- digital input */

  242. 	           (3 << 2) | /* compression: 3 -- no information */

  243. 	            0;        /* misc. info/SMPTE emphasis off */

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

  245.                    (1 << 6) | /* recording end point: 1 -- no */

  246. 	           (1 << 3) | /* recording mode: 1 -- original */

  247. 	            7;         

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

  249.                     0x20;     /* speed */

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

  251.                     0x7f;     /* genre category */

  252. 	  break;

  253.     case dv_audio_recdate:

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

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

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

  257.           brktimegm(ct, &tc);

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

  259. 	                 /* 0xff is very likely to be "unknown" */

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

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

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

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

  264. 	           ((tc.tm_mon / 10) << 4) |    /* Tens of month */

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

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

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

  268.           break;

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

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

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

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

  273. 	  brktimegm(ct, &tc);

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

  275. 		   0x3f; /* tens of frame, units of frame: 0x3f - "unknown" ? */

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

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

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

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

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

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

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

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

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

  285. 	  break;

  286.     case dv_video_source:

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

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

  289. 		   (1 << 6) | /* following CLF is valid - 0, invalid - 1 */

  290. 		   (3 << 4) | /* CLF: color frames id (see ITU-R BT.470-4) */

  291. 		   0xf; /* reserved -- always 1 */

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

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

  294. 		   0; /* signal type video compression */

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

  296.           break;

  297.     case dv_video_control:

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

  299. 		   0x3f; /* reserved -- always 1 */

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

  301. 		   c->aspect;

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

  303. 		   (1 << 6) | /* First/second field flag 0 -- field 2, 1 -- field 1 */

  304. 		   (1 << 5) | /* Frame change flag 0 -- same picture as before, 1 -- different */

  305. 		   (1 << 4) | /* 1 - interlaced, 0 - noninterlaced */

  306. 		   0xc; /* reserved -- always b1100 */

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

  308.           break;

  309.     default:

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

  311.     }

  312.     return 5;

  313. }

  314. 

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

  316.                                   uint8_t dif_num, uint8_t* buf)

  317. {

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

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

  320. 	     (0 << 3) |     /* FSC: for 50Mb/s 0 - first channel; 1 - second */

  321. 	     7;             /* reserved -- always 1 */

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

  323.     return 3;

  324. }

  325. 

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

  327. {

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

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

  330. 		 (0<<4)  | /* AP3 (Subcode application ID) */

  331. 		 0x0f;     /* reserved -- always 1 */

  332.     } 

  333.     else if (syb_num == 11) {

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

  335.                  0x7f;     /* reserved -- always 1 */

  336.     }

  337.     else {

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

  339.                  (0<<4)  | /* APT (Track application ID) */

  340. 		 0x0f;     /* reserved -- always 1 */

  341.     }

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

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

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

  345.     return 3;

  346. }

  347. 

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

  349. {

  350.     int i, j, k;

  351.     

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

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

  354.        

  355.        /* DV header: 1DIF */

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

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

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

  359. 				   

  360.        /* DV subcode: 2DIFs */

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

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

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

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

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

  366. 	  }

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

  368.        }

  369.        

  370.        /* DV VAUX: 3DIFs */

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

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

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

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

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

  376.        } 

  377.        

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

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

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

  381. 	        memset(buf, 0xff, 80);

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

  383.                 buf += 77; /* audio control & shuffled PCM audio */

  384. 	    }

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

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

  387. 			                       4 * 14 bytes Y 8x8 data

  388. 			                           10 bytes Cr 8x8 data

  389. 						   10 bytes Cb 8x8 data */

  390.        }

  391.     }

  392. }

  393. 

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

  395. {

  396.     int i, j, d, of, size;

  397.     size = 4 * dv_audio_frame_size(c->sys, c->frames);

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

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

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

  401. 	  dv_write_pack(dv_aaux_packs_dist[i][j], c, &frame_ptr[3]);

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

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

  404. 	     if (of*2 >= size)

  405. 	         continue;

  406. 	     

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

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

  409.           }

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

  411.        }

  412.     }

  413. }

  414. 

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

  416. {

  417.     int i, j;

  418.     int ptr = 0;

  419. 

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

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

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

  423.             if (j%15 == 0)

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

  425. 	    ptr += 3;

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

  427. 	    ptr += 77;

  428.        }

  429.     }

  430. }

  431. 

  432. /* 

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

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

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

  436.  */

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

  438. {

  439.     int offs;

  440.     

  441.     switch (t) {

  442.     case dv_audio_source:

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

  444. 	  break;

  445.     case dv_audio_control:

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

  447. 	  break;

  448.     case dv_video_control:

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

  450.           break;

  451.     default:

  452.           return NULL;

  453.     }   

  454. 

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

  456. }

  457. 

  458. /* 

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

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

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

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

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

  464.  *    are converted into 16bit linear ones.

  465.  */

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

  467. {

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

  469.     uint16_t lc, rc;

  470.     const DVprofile* sys;

  471.     const uint8_t* as_pack;

  472.     

  473.     as_pack = dv_extract_pack(frame, dv_audio_source);

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

  475. 	return 0;

  476.    

  477.     sys = dv_frame_profile(frame);

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

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

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

  481.     

  482.     if (quant > 1)

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

  484. 

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

  486.     half_ch = sys->difseg_size/2;

  487. 

  488.     /* for each DIF segment */

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

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

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

  492.            if (!pcm2)

  493.                break;

  494.            else

  495.                pcm = pcm2;

  496.        }

  497. 

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

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

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

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

  502.                  if (of*2 >= size)

  503. 		     continue;

  504. 		 

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

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

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

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

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

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

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

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

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

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

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

  516. 

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

  518.                  if (of*2 >= size)

  519. 		     continue;

  520. 

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

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

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

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

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

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

  527. 		 ++d;

  528. 	      }

  529. 	  }

  530. 		

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

  532.         }

  533.     }

  534. 

  535.     return size;

  536. }

  537. 

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

  539. {

  540.     const uint8_t* as_pack;

  541.     const DVprofile* sys;

  542.     int freq, smpls, quant, i, ach;

  543. 

  544.     sys = dv_frame_profile(frame);

  545.     as_pack = dv_extract_pack(frame, dv_audio_source);

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

  547.         c->ach = 0;

  548. 	return 0;

  549.     }

  550.     

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

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

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

  554.     ach = (quant && freq == 2) ? 2 : 1;

  555. 

  556.     /* Dynamic handling of the audio streams in DV */

  557.     for (i=0; i<ach; i++) {

  558.        if (!c->ast[i]) {

  559.            c->ast[i] = av_new_stream(c->fctx, 0);

  560. 	   if (!c->ast[i])

  561. 	       break;

  562. 	   av_set_pts_info(c->ast[i], 64, 1, 30000);

  563. 	   c->ast[i]->codec.codec_type = CODEC_TYPE_AUDIO;

  564. 	   c->ast[i]->codec.codec_id = CODEC_ID_PCM_S16LE;

  565. 

  566.            av_init_packet(&c->audio_pkt[i]);

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

  568.            c->audio_pkt[i].data     = c->audio_buf[i];

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

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

  571.        }

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

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

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

  575.        c->ast[i]->start_time = 0;

  576.     }

  577.     c->ach = i;

  578.     

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

  580. }

  581. 

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

  583. {

  584.     const DVprofile* sys; 

  585.     const uint8_t* vsc_pack;

  586.     AVCodecContext* avctx;

  587.     int apt, is16_9;

  588.     int size = 0;

  589.     

  590.     sys = dv_frame_profile(frame);

  591.     if (sys) {

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

  593. 	

  594.         av_set_pts_info(c->vst, 64, sys->frame_rate_base, sys->frame_rate);

  595.         avctx->time_base= (AVRational){sys->frame_rate_base, sys->frame_rate};

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

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

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

  599.         

  600. 	/* finding out SAR is a little bit messy */

  601. 	vsc_pack = dv_extract_pack(frame, dv_video_control);

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

  603. 	is16_9 = (vsc_pack && ((vsc_pack[2] & 0x07) == 0x02 ||

  604. 	                       (!apt && (vsc_pack[2] & 0x07) == 0x07)));

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

  606. 	

  607. 	size = sys->frame_size;

  608.     }

  609.     return size;

  610. }

  611. 

  612. /* 

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

  614.  */

  615. 

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

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

  618. {

  619.     uint8_t pcm[8192];

  620.     int fsize, reqasize;

  621.    

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

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

  624.         dv_format_frame(c, *frame);

  625. 	c->frames++;

  626. 	if (c->has_audio > 0)

  627. 	    c->has_audio = 0;

  628. 	c->has_video = 0;

  629.     }

  630.     

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

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

  633. 	if (c->has_video)

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

  635. 	    

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

  637. 	c->has_video = 1;

  638. 	data_size = 0;

  639. 	if (c->has_audio < 0)

  640. 	    goto out;

  641.     } 

  642.     

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

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

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

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

  647.             if (fsize >= reqasize) {

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

  649.             } else {

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

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

  652. 		data += reqasize - fsize;

  653. 		data_size -= reqasize - fsize;

  654. 	    }

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

  656. 	    c->has_audio = 1;

  657. 	}

  658.     

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

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

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

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

  663.     }

  664. 

  665. out:

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

  667. }

  668. 

  669. DVMuxContext* dv_init_mux(AVFormatContext* s)

  670. {

  671.     DVMuxContext *c;

  672.     AVStream *vst = NULL;

  673.     AVStream *ast = NULL;

  674.     int i;

  675. 

  676.     if (s->nb_streams > 2)

  677.         return NULL;

  678. 

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

  680.     if (!c)

  681.         return NULL;

  682. 

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

  684.     for (i=0; i<s->nb_streams; i++) {

  685.          switch (s->streams[i]->codec.codec_type) {

  686. 	 case CODEC_TYPE_VIDEO:

  687. 	       vst = s->streams[i];

  688. 	       break;

  689. 	 case CODEC_TYPE_AUDIO:

  690. 	       ast = s->streams[i];

  691. 	       break;

  692. 	 default:

  693. 	       goto bail_out;

  694. 	 }

  695.     }

  696.     

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

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

  699.         goto bail_out;

  700.     if (ast  && (ast->codec.codec_id != CODEC_ID_PCM_S16LE ||

  701. 	         ast->codec.sample_rate != 48000 ||

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

  703. 	goto bail_out;

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

  705.     if (!c->sys)

  706. 	goto bail_out;

  707.     

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

  709.     c->frames = 0;

  710.     c->has_audio = ast ? 0 : -1;

  711.     c->has_video = 0;

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

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

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

  715.         c->aspect = 0x07;

  716. 

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

  718.         goto bail_out;

  719. 

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

  721. 

  722.     return c;

  723.     

  724. bail_out:

  725.     av_free(c);

  726.     return NULL;

  727. }

  728. 

  729. void dv_delete_mux(DVMuxContext *c)

  730. {    

  731.     fifo_free(&c->audio_data);

  732. }

  733. 

  734. DVDemuxContext* dv_init_demux(AVFormatContext *s)

  735. {

  736.     DVDemuxContext *c;

  737. 

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

  739.     if (!c)

  740.         return NULL;

  741. 

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

  743.     if (!c->vst) {

  744.         av_free(c);        

  745.         return NULL;

  746.     }

  747. 

  748.     c->fctx = s;

  749.     c->ast[0] = c->ast[1] = NULL;

  750.     c->ach = 0;

  751.     c->frames = 0;

  752.     c->abytes = 0;

  753. 

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

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

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

  757.     c->vst->start_time = 0;

  758.     

  759.     return c;

  760. }

  761. 

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

  763. {

  764.     int size = -1;

  765.     int i;

  766. 

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

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

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

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

  771. 	   size = pkt->size;

  772. 	   break;

  773.        }

  774.     }

  775. 

  776.     return size;

  777. }

  778. 

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

  780.                       uint8_t* buf, int buf_size)

  781. {

  782.     int size, i;

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

  784.    

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

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

  787. 

  788.     /* Queueing audio packet */

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

  790.     size = dv_extract_audio_info(c, buf);

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

  792.        c->audio_pkt[i].size = size;

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

  794.     }

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

  796.     c->abytes += size;

  797.     

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

  799.     size = dv_extract_video_info(c, buf);

  800.     av_init_packet(pkt);

  801.     pkt->data     = buf;

  802.     pkt->size     = size; 

  803.     pkt->flags   |= PKT_FLAG_KEY;

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

  805.     pkt->pts      = c->frames;

  806.     

  807.     c->frames++;

  808. 

  809.     return size;

  810. }

  811.                            

  812. static int64_t dv_frame_offset(AVFormatContext *s, DVDemuxContext *c,

  813.                               int64_t timestamp, int flags)

  814. {

  815.     // FIXME: sys may be wrong if last dv_read_packet() failed (buffer is junk)

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

  817.     int64_t offset;

  818.     int64_t size = url_fsize(&s->pb);

  819.     int64_t max_offset = ((size-1) / sys->frame_size) * sys->frame_size;

  820. 

  821.     offset = sys->frame_size * timestamp;

  822.     

  823.     if (offset > max_offset) offset = max_offset;

  824.     else if (offset < 0) offset = 0;

  825. 

  826.     return offset;

  827. }

  828. 

  829. void dv_flush_audio_packets(DVDemuxContext *c)

  830. {

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

  832. }

  833. 

  834. /************************************************************

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

  836.  ************************************************************/

  837.  

  838. typedef struct RawDVContext {

  839.     uint8_t         buf[144000];

  840.     DVDemuxContext* dv_demux;

  841. } RawDVContext;

  842. 

  843. static int dv_read_header(AVFormatContext *s,

  844.                           AVFormatParameters *ap)

  845. {

  846.     RawDVContext *c = s->priv_data;

  847.     const DVprofile* sys;

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

  849.     if (!c->dv_demux)

  850.         return -1;

  851.    

  852.     if (get_buffer(&s->pb, c->buf, 4) <= 0 || url_fseek(&s->pb, -4, SEEK_CUR) < 0)

  853.         return AVERROR_IO;

  854. 

  855.     sys = dv_frame_profile(c->buf);

  856.     s->bit_rate = av_rescale(sys->frame_size * 8, sys->frame_rate, sys->frame_rate_base);

  857.    

  858.     return 0;

  859. }

  860. 

  861. 

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

  863. {

  864.     int size;

  865.     RawDVContext *c = s->priv_data; 

  866.   

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

  868.     

  869.     if (size < 0) {

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

  871.             return AVERROR_IO;

  872.     

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

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

  875. 	    return AVERROR_IO;

  876. 

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

  878.     } 

  879.     

  880.     return size;

  881. }

  882. 

  883. static int dv_read_seek(AVFormatContext *s, int stream_index, 

  884.                        int64_t timestamp, int flags)

  885. {

  886.     RawDVContext *r = s->priv_data;

  887.     DVDemuxContext *c = r->dv_demux;

  888.     int64_t offset= dv_frame_offset(s, c, timestamp, flags);

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

  890. 

  891.     c->frames= offset / sys->frame_size;

  892.     if (c->ach)

  893.         c->abytes= av_rescale(c->frames,

  894.                           c->ast[0]->codec.bit_rate * (int64_t)sys->frame_rate_base,

  895.                           8*sys->frame_rate);

  896. 			  

  897.     dv_flush_audio_packets(c);

  898.     return url_fseek(&s->pb, offset, SEEK_SET);

  899. }

  900. 

  901. static int dv_read_close(AVFormatContext *s)

  902. {

  903.     RawDVContext *c = s->priv_data;

  904.     av_free(c->dv_demux);

  905.     return 0;

  906. }

  907. 

  908. static int dv_write_header(AVFormatContext *s)

  909. {

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

  911.     if (!s->priv_data) {

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

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

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

  915. 	return -1;

  916.     }

  917.     return 0;

  918. }

  919. 

  920. static int dv_write_packet(struct AVFormatContext *s, AVPacket *pkt)

  921. {

  922.     uint8_t* frame;

  923.     int fsize;

  924.    

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

  926.                               pkt->data, pkt->size, &frame);

  927.     if (fsize > 0) {

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

  929.         put_flush_packet(&s->pb);

  930.     } 

  931.     return 0;

  932. }

  933. 

  934. /* 

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

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

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

  938.  * is the best strategy of all

  939.  */

  940. static int dv_write_trailer(struct AVFormatContext *s)

  941. {

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

  943.     return 0;

  944. }

  945. 

  946. static AVInputFormat dv_iformat = {

  947.     "dv",

  948.     "DV video format",

  949.     sizeof(RawDVContext),

  950.     NULL,

  951.     dv_read_header,

  952.     dv_read_packet,

  953.     dv_read_close,

  954.     dv_read_seek,

  955.     .extensions = "dv,dif",

  956. };

  957. 

  958. static AVOutputFormat dv_oformat = {

  959.     "dv",

  960.     "DV video format",

  961.     NULL,

  962.     "dv",

  963.     sizeof(DVMuxContext),

  964.     CODEC_ID_PCM_S16LE,

  965.     CODEC_ID_DVVIDEO,

  966.     dv_write_header,

  967.     dv_write_packet,

  968.     dv_write_trailer,

  969. };

  970. 

  971. int ff_dv_init(void)

  972. {

  973.     av_register_input_format(&dv_iformat);

  974.     av_register_output_format(&dv_oformat);

  975.     return 0;

  976. }