LCOV - code coverage report
Current view: top level - libavcodec - dv.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 74 107 69.2 %
Date: 2017-12-17 16:07:53 Functions: 3 3 100.0 %

          Line data    Source code
       1             : /*
       2             :  * DV decoder
       3             :  * Copyright (c) 2002 Fabrice Bellard
       4             :  * Copyright (c) 2004 Roman Shaposhnik
       5             :  *
       6             :  * DV encoder
       7             :  * Copyright (c) 2003 Roman Shaposhnik
       8             :  *
       9             :  * 50 Mbps (DVCPRO50) support
      10             :  * Copyright (c) 2006 Daniel Maas <dmaas@maasdigital.com>
      11             :  *
      12             :  * 100 Mbps (DVCPRO HD) support
      13             :  * Initial code by Daniel Maas <dmaas@maasdigital.com> (funded by BBC R&D)
      14             :  * Final code by Roman Shaposhnik
      15             :  *
      16             :  * Many thanks to Dan Dennedy <dan@dennedy.org> for providing wealth
      17             :  * of DV technical info.
      18             :  *
      19             :  * This file is part of FFmpeg.
      20             :  *
      21             :  * FFmpeg is free software; you can redistribute it and/or
      22             :  * modify it under the terms of the GNU Lesser General Public
      23             :  * License as published by the Free Software Foundation; either
      24             :  * version 2.1 of the License, or (at your option) any later version.
      25             :  *
      26             :  * FFmpeg is distributed in the hope that it will be useful,
      27             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      28             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      29             :  * Lesser General Public License for more details.
      30             :  *
      31             :  * You should have received a copy of the GNU Lesser General Public
      32             :  * License along with FFmpeg; if not, write to the Free Software
      33             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      34             :  */
      35             : 
      36             : /**
      37             :  * @file
      38             :  * DV codec.
      39             :  */
      40             : 
      41             : #include "libavutil/internal.h"
      42             : #include "libavutil/pixdesc.h"
      43             : 
      44             : #include "avcodec.h"
      45             : #include "dv.h"
      46             : #include "dvdata.h"
      47             : #include "internal.h"
      48             : #include "put_bits.h"
      49             : #include "simple_idct.h"
      50             : 
      51             : /* XXX: also include quantization */
      52             : RL_VLC_ELEM ff_dv_rl_vlc[1664];
      53             : 
      54       21330 : static inline void dv_calc_mb_coordinates(const AVDVProfile *d, int chan,
      55             :                                           int seq, int slot, uint16_t *tbl)
      56             : {
      57             :     static const uint8_t off[]   = {  2,  6,  8, 0,  4 };
      58             :     static const uint8_t shuf1[] = { 36, 18, 54, 0, 72 };
      59             :     static const uint8_t shuf2[] = { 24, 12, 36, 0, 48 };
      60             :     static const uint8_t shuf3[] = { 18,  9, 27, 0, 36 };
      61             : 
      62             :     static const uint8_t l_start[]          = { 0, 4, 9, 13, 18, 22, 27, 31, 36, 40 };
      63             :     static const uint8_t l_start_shuffled[] = { 9, 4, 13, 0, 18 };
      64             : 
      65             :     static const uint8_t serpent1[] = {
      66             :         0, 1, 2, 2, 1, 0,
      67             :         0, 1, 2, 2, 1, 0,
      68             :         0, 1, 2, 2, 1, 0,
      69             :         0, 1, 2, 2, 1, 0,
      70             :         0, 1, 2
      71             :     };
      72             :     static const uint8_t serpent2[] = {
      73             :         0, 1, 2, 3, 4, 5, 5, 4, 3, 2, 1, 0,
      74             :         0, 1, 2, 3, 4, 5, 5, 4, 3, 2, 1, 0,
      75             :         0, 1, 2, 3, 4, 5
      76             :     };
      77             : 
      78             :     static const uint8_t remap[][2] = {
      79             :         {  0,  0 }, {  0,  0 }, {  0,  0 }, {  0,  0 }, /* dummy */
      80             :         {  0,  0 }, {  0,  1 }, {  0,  2 }, {  0,  3 }, { 10,  0 },
      81             :         { 10,  1 }, { 10,  2 }, { 10,  3 }, { 20,  0 }, { 20,  1 },
      82             :         { 20,  2 }, { 20,  3 }, { 30,  0 }, { 30,  1 }, { 30,  2 },
      83             :         { 30,  3 }, { 40,  0 }, { 40,  1 }, { 40,  2 }, { 40,  3 },
      84             :         { 50,  0 }, { 50,  1 }, { 50,  2 }, { 50,  3 }, { 60,  0 },
      85             :         { 60,  1 }, { 60,  2 }, { 60,  3 }, { 70,  0 }, { 70,  1 },
      86             :         { 70,  2 }, { 70,  3 }, {  0, 64 }, {  0, 65 }, {  0, 66 },
      87             :         { 10, 64 }, { 10, 65 }, { 10, 66 }, { 20, 64 }, { 20, 65 },
      88             :         { 20, 66 }, { 30, 64 }, { 30, 65 }, { 30, 66 }, { 40, 64 },
      89             :         { 40, 65 }, { 40, 66 }, { 50, 64 }, { 50, 65 }, { 50, 66 },
      90             :         { 60, 64 }, { 60, 65 }, { 60, 66 }, { 70, 64 }, { 70, 65 },
      91             :         { 70, 66 }, {  0, 67 }, { 20, 67 }, { 40, 67 }, { 60, 67 }
      92             :     };
      93             : 
      94             :     int i, k, m;
      95             :     int x, y, blk;
      96             : 
      97      127980 :     for (m = 0; m < 5; m++) {
      98      106650 :         switch (d->width) {
      99           0 :         case 1440:
     100           0 :             blk = (chan * 11 + seq) * 27 + slot;
     101             : 
     102           0 :             if (chan == 0 && seq == 11) {
     103           0 :                 x = m * 27 + slot;
     104           0 :                 if (x < 90) {
     105           0 :                     y = 0;
     106             :                 } else {
     107           0 :                     x = (x - 90) * 2;
     108           0 :                     y = 67;
     109             :                 }
     110             :             } else {
     111           0 :                 i = (4 * chan + blk + off[m]) % 11;
     112           0 :                 k = (blk / 11) % 27;
     113             : 
     114           0 :                 x = shuf1[m] + (chan & 1) * 9 + k % 9;
     115           0 :                 y = (i * 3 + k / 9) * 2 + (chan >> 1) + 1;
     116             :             }
     117           0 :             tbl[m] = (x << 1) | (y << 9);
     118           0 :             break;
     119           0 :         case 1280:
     120           0 :             blk = (chan * 10 + seq) * 27 + slot;
     121             : 
     122           0 :             i = (4 * chan + (seq / 5) + 2 * blk + off[m]) % 10;
     123           0 :             k = (blk / 5) % 27;
     124             : 
     125           0 :             x = shuf1[m] + (chan & 1) * 9 + k % 9;
     126           0 :             y = (i * 3 + k / 9) * 2 + (chan >> 1) + 4;
     127             : 
     128           0 :             if (x >= 80) {
     129           0 :                 x = remap[y][0] + ((x - 80) << (y > 59));
     130           0 :                 y = remap[y][1];
     131             :             }
     132           0 :             tbl[m] = (x << 1) | (y << 9);
     133           0 :             break;
     134           0 :         case 960:
     135           0 :             blk = (chan * 10 + seq) * 27 + slot;
     136             : 
     137           0 :             i = (4 * chan + (seq / 5) + 2 * blk + off[m]) % 10;
     138           0 :             k = (blk / 5) % 27 + (i & 1) * 3;
     139             : 
     140           0 :             x      = shuf2[m]   + k % 6 +  6 * (chan  & 1);
     141           0 :             y      = l_start[i] + k / 6 + 45 * (chan >> 1);
     142           0 :             tbl[m] = (x << 1) | (y << 9);
     143           0 :             break;
     144      106650 :         case 720:
     145      106650 :             switch (d->pix_fmt) {
     146       45360 :             case AV_PIX_FMT_YUV422P:
     147       45360 :                 x = shuf3[m] + slot / 3;
     148       90720 :                 y = serpent1[slot] +
     149       45360 :                     ((((seq + off[m]) % d->difseg_size) << 1) + chan) * 3;
     150       45360 :                 tbl[m] = (x << 1) | (y << 8);
     151       45360 :                 break;
     152       35640 :             case AV_PIX_FMT_YUV420P:
     153       35640 :                 x = shuf3[m] + slot / 3;
     154       71280 :                 y = serpent1[slot] +
     155       35640 :                     ((seq + off[m]) % d->difseg_size) * 3;
     156       35640 :                 tbl[m] = (x << 1) | (y << 9);
     157       35640 :                 break;
     158       25650 :             case AV_PIX_FMT_YUV411P:
     159       25650 :                 i = (seq + off[m]) % d->difseg_size;
     160       25650 :                 k = slot + ((m == 1 || m == 2) ? 3 : 0);
     161             : 
     162       25650 :                 x = l_start_shuffled[m] + k / 6;
     163       25650 :                 y = serpent2[k] + i * 6;
     164       25650 :                 if (x > 21)
     165         570 :                     y = y * 2 - i * 6;
     166       25650 :                 tbl[m] = (x << 2) | (y << 8);
     167       25650 :                 break;
     168             :             }
     169             :         default:
     170      106650 :             break;
     171             :         }
     172             :     }
     173       21330 : }
     174             : 
     175          53 : int ff_dv_init_dynamic_tables(DVVideoContext *ctx, const AVDVProfile *d)
     176             : {
     177             :     int j, i, c, s, p;
     178             : 
     179          53 :     p = i = 0;
     180         120 :     for (c = 0; c < d->n_difchan; c++) {
     181         857 :         for (s = 0; s < d->difseg_size; s++) {
     182         790 :             p += 6;
     183       22120 :             for (j = 0; j < 27; j++) {
     184       21330 :                 p += !(j % 3);
     185       42660 :                 if (!(DV_PROFILE_IS_1080i50(d) && c != 0 && s == 11) &&
     186       21330 :                     !(DV_PROFILE_IS_720p50(d) && s > 9)) {
     187       21330 :                     dv_calc_mb_coordinates(d, c, s, j, &ctx->work_chunks[i].mb_coordinates[0]);
     188       21330 :                     ctx->work_chunks[i++].buf_offset = p;
     189             :                 }
     190       21330 :                 p += 5;
     191             :             }
     192             :         }
     193             :     }
     194             : 
     195          53 :     return 0;
     196             : }
     197             : 
     198          55 : av_cold int ff_dvvideo_init(AVCodecContext *avctx)
     199             : {
     200          55 :     DVVideoContext *s = avctx->priv_data;
     201             :     static int done = 0;
     202             :     int i, j;
     203             : 
     204          55 :     if (!done) {
     205             :         VLC dv_vlc;
     206             :         uint16_t  new_dv_vlc_bits[NB_DV_VLC * 2];
     207             :         uint8_t    new_dv_vlc_len[NB_DV_VLC * 2];
     208             :         uint8_t    new_dv_vlc_run[NB_DV_VLC * 2];
     209             :         int16_t  new_dv_vlc_level[NB_DV_VLC * 2];
     210             : 
     211          38 :         done = 1;
     212             : 
     213             :         /* it's faster to include sign bit in a generic VLC parsing scheme */
     214       15580 :         for (i = 0, j = 0; i < NB_DV_VLC; i++, j++) {
     215       15542 :             new_dv_vlc_bits[j]  = ff_dv_vlc_bits[i];
     216       15542 :             new_dv_vlc_len[j]   = ff_dv_vlc_len[i];
     217       15542 :             new_dv_vlc_run[j]   = ff_dv_vlc_run[i];
     218       15542 :             new_dv_vlc_level[j] = ff_dv_vlc_level[i];
     219             : 
     220       15542 :             if (ff_dv_vlc_level[i]) {
     221       12806 :                 new_dv_vlc_bits[j] <<= 1;
     222       12806 :                 new_dv_vlc_len[j]++;
     223             : 
     224       12806 :                 j++;
     225       12806 :                 new_dv_vlc_bits[j]  = (ff_dv_vlc_bits[i] << 1) | 1;
     226       12806 :                 new_dv_vlc_len[j]   =  ff_dv_vlc_len[i] + 1;
     227       12806 :                 new_dv_vlc_run[j]   =  ff_dv_vlc_run[i];
     228       12806 :                 new_dv_vlc_level[j] = -ff_dv_vlc_level[i];
     229             :             }
     230             :         }
     231             : 
     232             :         /* NOTE: as a trick, we use the fact the no codes are unused
     233             :          * to accelerate the parsing of partial codes */
     234          38 :         init_vlc(&dv_vlc, TEX_VLC_BITS, j, new_dv_vlc_len,
     235             :                  1, 1, new_dv_vlc_bits, 2, 2, 0);
     236             :         av_assert1(dv_vlc.table_size == 1664);
     237             : 
     238       63270 :         for (i = 0; i < dv_vlc.table_size; i++) {
     239       63232 :             int code = dv_vlc.table[i][0];
     240       63232 :             int len  = dv_vlc.table[i][1];
     241             :             int level, run;
     242             : 
     243       63232 :             if (len < 0) { // more bits needed
     244        1216 :                 run   = 0;
     245        1216 :                 level = code;
     246             :             } else {
     247       62016 :                 run   = new_dv_vlc_run[code] + 1;
     248       62016 :                 level = new_dv_vlc_level[code];
     249             :             }
     250       63232 :             ff_dv_rl_vlc[i].len   = len;
     251       63232 :             ff_dv_rl_vlc[i].level = level;
     252       63232 :             ff_dv_rl_vlc[i].run   = run;
     253             :         }
     254          38 :         ff_free_vlc(&dv_vlc);
     255             :     }
     256             : 
     257          55 :     s->avctx = avctx;
     258          55 :     avctx->chroma_sample_location = AVCHROMA_LOC_TOPLEFT;
     259             : 
     260          55 :     return 0;
     261             : }
     262             : 

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