LCOV - code coverage report
Current view: top level - libavcodec - a64multienc.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 0 172 0.0 %
Date: 2017-12-12 03:56:30 Functions: 0 6 0.0 %

          Line data    Source code
       1             : /*
       2             :  * a64 video encoder - multicolor modes
       3             :  * Copyright (c) 2009 Tobias Bindhammer
       4             :  *
       5             :  * This file is part of FFmpeg.
       6             :  *
       7             :  * FFmpeg is free software; you can redistribute it and/or
       8             :  * modify it under the terms of the GNU Lesser General Public
       9             :  * License as published by the Free Software Foundation; either
      10             :  * version 2.1 of the License, or (at your option) any later version.
      11             :  *
      12             :  * FFmpeg is distributed in the hope that it will be useful,
      13             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      14             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      15             :  * Lesser General Public License for more details.
      16             :  *
      17             :  * You should have received a copy of the GNU Lesser General Public
      18             :  * License along with FFmpeg; if not, write to the Free Software
      19             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      20             :  */
      21             : 
      22             : /**
      23             :  * @file
      24             :  * a64 video encoder - multicolor modes
      25             :  */
      26             : 
      27             : #include "a64colors.h"
      28             : #include "a64tables.h"
      29             : #include "elbg.h"
      30             : #include "internal.h"
      31             : #include "libavutil/avassert.h"
      32             : #include "libavutil/common.h"
      33             : #include "libavutil/intreadwrite.h"
      34             : 
      35             : #define DITHERSTEPS   8
      36             : #define CHARSET_CHARS 256
      37             : #define INTERLACED    1
      38             : #define CROP_SCREENS  1
      39             : 
      40             : #define C64XRES 320
      41             : #define C64YRES 200
      42             : 
      43             : typedef struct A64Context {
      44             :     /* variables for multicolor modes */
      45             :     AVLFG randctx;
      46             :     int mc_lifetime;
      47             :     int mc_use_5col;
      48             :     unsigned mc_frame_counter;
      49             :     int *mc_meta_charset;
      50             :     int *mc_charmap;
      51             :     int *mc_best_cb;
      52             :     int mc_luma_vals[5];
      53             :     uint8_t *mc_charset;
      54             :     uint8_t *mc_colram;
      55             :     uint8_t *mc_palette;
      56             :     int mc_pal_size;
      57             : 
      58             :     /* pts of the next packet that will be output */
      59             :     int64_t next_pts;
      60             : } A64Context;
      61             : 
      62             : /* gray gradient */
      63             : static const int mc_colors[5]={0x0,0xb,0xc,0xf,0x1};
      64             : 
      65             : /* other possible gradients - to be tested */
      66             : //static const int mc_colors[5]={0x0,0x8,0xa,0xf,0x7};
      67             : //static const int mc_colors[5]={0x0,0x9,0x8,0xa,0x3};
      68             : 
      69           0 : static void to_meta_with_crop(AVCodecContext *avctx,
      70             :                               const AVFrame *p, int *dest)
      71             : {
      72             :     int blockx, blocky, x, y;
      73           0 :     int luma = 0;
      74           0 :     int height = FFMIN(avctx->height, C64YRES);
      75           0 :     int width  = FFMIN(avctx->width , C64XRES);
      76           0 :     uint8_t *src = p->data[0];
      77             : 
      78           0 :     for (blocky = 0; blocky < C64YRES; blocky += 8) {
      79           0 :         for (blockx = 0; blockx < C64XRES; blockx += 8) {
      80           0 :             for (y = blocky; y < blocky + 8 && y < C64YRES; y++) {
      81           0 :                 for (x = blockx; x < blockx + 8 && x < C64XRES; x += 2) {
      82           0 :                     if(x < width && y < height) {
      83           0 :                         if (x + 1 < width) {
      84             :                             /* build average over 2 pixels */
      85           0 :                             luma = (src[(x + 0 + y * p->linesize[0])] +
      86           0 :                                     src[(x + 1 + y * p->linesize[0])]) / 2;
      87             :                         } else {
      88           0 :                             luma = src[(x + y * p->linesize[0])];
      89             :                         }
      90             :                         /* write blocks as linear data now so they are suitable for elbg */
      91           0 :                         dest[0] = luma;
      92             :                     }
      93           0 :                     dest++;
      94             :                 }
      95             :             }
      96             :         }
      97             :     }
      98           0 : }
      99             : 
     100           0 : static void render_charset(AVCodecContext *avctx, uint8_t *charset,
     101             :                            uint8_t *colrammap)
     102             : {
     103           0 :     A64Context *c = avctx->priv_data;
     104             :     uint8_t row1, row2;
     105             :     int charpos, x, y;
     106             :     int a, b;
     107             :     uint8_t pix;
     108             :     int lowdiff, highdiff;
     109           0 :     int *best_cb = c->mc_best_cb;
     110             :     static uint8_t index1[256];
     111             :     static uint8_t index2[256];
     112             :     static uint8_t dither[256];
     113             :     int i;
     114             :     int distance;
     115             : 
     116             :     /* generate lookup-tables for dither and index before looping */
     117           0 :     i = 0;
     118           0 :     for (a=0; a < 256; a++) {
     119           0 :         if(i < c->mc_pal_size -1 && a == c->mc_luma_vals[i + 1]) {
     120           0 :             distance = c->mc_luma_vals[i + 1] - c->mc_luma_vals[i];
     121           0 :             for(b = 0; b <= distance; b++) {
     122           0 :                   dither[c->mc_luma_vals[i] + b] = b * (DITHERSTEPS - 1) / distance;
     123             :             }
     124           0 :             i++;
     125             :         }
     126           0 :         if(i >= c->mc_pal_size - 1) dither[a] = 0;
     127           0 :         index1[a] = i;
     128           0 :         index2[a] = FFMIN(i + 1, c->mc_pal_size - 1);
     129             :     }
     130             : 
     131             :     /* and render charset */
     132           0 :     for (charpos = 0; charpos < CHARSET_CHARS; charpos++) {
     133           0 :         lowdiff  = 0;
     134           0 :         highdiff = 0;
     135           0 :         for (y = 0; y < 8; y++) {
     136           0 :             row1 = 0; row2 = 0;
     137           0 :             for (x = 0; x < 4; x++) {
     138           0 :                 pix = best_cb[y * 4 + x];
     139             : 
     140             :                 /* accumulate error for brightest/darkest color */
     141           0 :                 if (index1[pix] >= 3)
     142           0 :                     highdiff += pix - c->mc_luma_vals[3];
     143           0 :                 if (index1[pix] < 1)
     144           0 :                     lowdiff += c->mc_luma_vals[1] - pix;
     145             : 
     146           0 :                 row1 <<= 2;
     147             : 
     148             :                 if (INTERLACED) {
     149           0 :                     row2 <<= 2;
     150           0 :                     if (interlaced_dither_patterns[dither[pix]][(y & 3) * 2 + 0][x & 3])
     151           0 :                         row1 |= 3-(index2[pix] & 3);
     152             :                     else
     153           0 :                         row1 |= 3-(index1[pix] & 3);
     154             : 
     155           0 :                     if (interlaced_dither_patterns[dither[pix]][(y & 3) * 2 + 1][x & 3])
     156           0 :                         row2 |= 3-(index2[pix] & 3);
     157             :                     else
     158           0 :                         row2 |= 3-(index1[pix] & 3);
     159             :                 }
     160             :                 else {
     161             :                     if (multi_dither_patterns[dither[pix]][(y & 3)][x & 3])
     162             :                         row1 |= 3-(index2[pix] & 3);
     163             :                     else
     164             :                         row1 |= 3-(index1[pix] & 3);
     165             :                 }
     166             :             }
     167           0 :             charset[y+0x000] = row1;
     168           0 :             if (INTERLACED) charset[y+0x800] = row2;
     169             :         }
     170             :         /* do we need to adjust pixels? */
     171           0 :         if (highdiff > 0 && lowdiff > 0 && c->mc_use_5col) {
     172           0 :             if (lowdiff > highdiff) {
     173           0 :                 for (x = 0; x < 32; x++)
     174           0 :                     best_cb[x] = FFMIN(c->mc_luma_vals[3], best_cb[x]);
     175             :             } else {
     176           0 :                 for (x = 0; x < 32; x++)
     177           0 :                     best_cb[x] = FFMAX(c->mc_luma_vals[1], best_cb[x]);
     178             :             }
     179           0 :             charpos--;          /* redo now adjusted char */
     180             :         /* no adjustment needed, all fine */
     181             :         } else {
     182             :             /* advance pointers */
     183           0 :             best_cb += 32;
     184           0 :             charset += 8;
     185             : 
     186             :             /* remember colorram value */
     187           0 :             colrammap[charpos] = (highdiff > 0);
     188             :         }
     189             :     }
     190           0 : }
     191             : 
     192           0 : static av_cold int a64multi_close_encoder(AVCodecContext *avctx)
     193             : {
     194           0 :     A64Context *c = avctx->priv_data;
     195           0 :     av_freep(&c->mc_meta_charset);
     196           0 :     av_freep(&c->mc_best_cb);
     197           0 :     av_freep(&c->mc_charset);
     198           0 :     av_freep(&c->mc_charmap);
     199           0 :     av_freep(&c->mc_colram);
     200           0 :     return 0;
     201             : }
     202             : 
     203           0 : static av_cold int a64multi_encode_init(AVCodecContext *avctx)
     204             : {
     205           0 :     A64Context *c = avctx->priv_data;
     206             :     int a;
     207           0 :     av_lfg_init(&c->randctx, 1);
     208             : 
     209           0 :     if (avctx->global_quality < 1) {
     210           0 :         c->mc_lifetime = 4;
     211             :     } else {
     212           0 :         c->mc_lifetime = avctx->global_quality /= FF_QP2LAMBDA;
     213             :     }
     214             : 
     215           0 :     av_log(avctx, AV_LOG_INFO, "charset lifetime set to %d frame(s)\n", c->mc_lifetime);
     216             : 
     217           0 :     c->mc_frame_counter = 0;
     218           0 :     c->mc_use_5col      = avctx->codec->id == AV_CODEC_ID_A64_MULTI5;
     219           0 :     c->mc_pal_size      = 4 + c->mc_use_5col;
     220             : 
     221             :     /* precalc luma values for later use */
     222           0 :     for (a = 0; a < c->mc_pal_size; a++) {
     223           0 :         c->mc_luma_vals[a]=a64_palette[mc_colors[a]][0] * 0.30 +
     224           0 :                            a64_palette[mc_colors[a]][1] * 0.59 +
     225           0 :                            a64_palette[mc_colors[a]][2] * 0.11;
     226             :     }
     227             : 
     228           0 :     if (!(c->mc_meta_charset = av_mallocz_array(c->mc_lifetime, 32000 * sizeof(int))) ||
     229           0 :        !(c->mc_best_cb       = av_malloc(CHARSET_CHARS * 32 * sizeof(int)))     ||
     230           0 :        !(c->mc_charmap       = av_mallocz_array(c->mc_lifetime, 1000 * sizeof(int))) ||
     231           0 :        !(c->mc_colram        = av_mallocz(CHARSET_CHARS * sizeof(uint8_t)))     ||
     232           0 :        !(c->mc_charset       = av_malloc(0x800 * (INTERLACED+1) * sizeof(uint8_t)))) {
     233           0 :         av_log(avctx, AV_LOG_ERROR, "Failed to allocate buffer memory.\n");
     234           0 :         return AVERROR(ENOMEM);
     235             :     }
     236             : 
     237             :     /* set up extradata */
     238           0 :     if (!(avctx->extradata = av_mallocz(8 * 4 + AV_INPUT_BUFFER_PADDING_SIZE))) {
     239           0 :         av_log(avctx, AV_LOG_ERROR, "Failed to allocate memory for extradata.\n");
     240           0 :         return AVERROR(ENOMEM);
     241             :     }
     242           0 :     avctx->extradata_size = 8 * 4;
     243           0 :     AV_WB32(avctx->extradata, c->mc_lifetime);
     244           0 :     AV_WB32(avctx->extradata + 16, INTERLACED);
     245             : 
     246           0 :     if (!avctx->codec_tag)
     247           0 :          avctx->codec_tag = AV_RL32("a64m");
     248             : 
     249           0 :     c->next_pts = AV_NOPTS_VALUE;
     250             : 
     251           0 :     return 0;
     252             : }
     253             : 
     254           0 : static void a64_compress_colram(unsigned char *buf, int *charmap, uint8_t *colram)
     255             : {
     256             :     int a;
     257             :     uint8_t temp;
     258             :     /* only needs to be done in 5col mode */
     259             :     /* XXX could be squeezed to 0x80 bytes */
     260           0 :     for (a = 0; a < 256; a++) {
     261           0 :         temp  = colram[charmap[a + 0x000]] << 0;
     262           0 :         temp |= colram[charmap[a + 0x100]] << 1;
     263           0 :         temp |= colram[charmap[a + 0x200]] << 2;
     264           0 :         if (a < 0xe8) temp |= colram[charmap[a + 0x300]] << 3;
     265           0 :         buf[a] = temp << 2;
     266             :     }
     267           0 : }
     268             : 
     269           0 : static int a64multi_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
     270             :                                  const AVFrame *p, int *got_packet)
     271             : {
     272           0 :     A64Context *c = avctx->priv_data;
     273             : 
     274             :     int frame;
     275             :     int x, y;
     276             :     int b_height;
     277             :     int b_width;
     278             : 
     279             :     int req_size, ret;
     280           0 :     uint8_t *buf = NULL;
     281             : 
     282           0 :     int *charmap     = c->mc_charmap;
     283           0 :     uint8_t *colram  = c->mc_colram;
     284           0 :     uint8_t *charset = c->mc_charset;
     285           0 :     int *meta        = c->mc_meta_charset;
     286           0 :     int *best_cb     = c->mc_best_cb;
     287             : 
     288           0 :     int charset_size = 0x800 * (INTERLACED + 1);
     289           0 :     int colram_size  = 0x100 * c->mc_use_5col;
     290             :     int screen_size;
     291             : 
     292             :     if(CROP_SCREENS) {
     293           0 :         b_height = FFMIN(avctx->height,C64YRES) >> 3;
     294           0 :         b_width  = FFMIN(avctx->width ,C64XRES) >> 3;
     295           0 :         screen_size = b_width * b_height;
     296             :     } else {
     297             :         b_height = C64YRES >> 3;
     298             :         b_width  = C64XRES >> 3;
     299             :         screen_size = 0x400;
     300             :     }
     301             : 
     302             :     /* no data, means end encoding asap */
     303           0 :     if (!p) {
     304             :         /* all done, end encoding */
     305           0 :         if (!c->mc_lifetime) return 0;
     306             :         /* no more frames in queue, prepare to flush remaining frames */
     307           0 :         if (!c->mc_frame_counter) {
     308           0 :             c->mc_lifetime = 0;
     309             :         }
     310             :         /* still frames in queue so limit lifetime to remaining frames */
     311           0 :         else c->mc_lifetime = c->mc_frame_counter;
     312             :     /* still new data available */
     313             :     } else {
     314             :         /* fill up mc_meta_charset with data until lifetime exceeds */
     315           0 :         if (c->mc_frame_counter < c->mc_lifetime) {
     316           0 :             to_meta_with_crop(avctx, p, meta + 32000 * c->mc_frame_counter);
     317           0 :             c->mc_frame_counter++;
     318           0 :             if (c->next_pts == AV_NOPTS_VALUE)
     319           0 :                 c->next_pts = p->pts;
     320             :             /* lifetime is not reached so wait for next frame first */
     321           0 :             return 0;
     322             :         }
     323             :     }
     324             : 
     325             :     /* lifetime reached so now convert X frames at once */
     326           0 :     if (c->mc_frame_counter == c->mc_lifetime) {
     327           0 :         req_size = 0;
     328             :         /* any frames to encode? */
     329           0 :         if (c->mc_lifetime) {
     330           0 :             int alloc_size = charset_size + c->mc_lifetime*(screen_size + colram_size);
     331           0 :             if ((ret = ff_alloc_packet2(avctx, pkt, alloc_size, 0)) < 0)
     332           0 :                 return ret;
     333           0 :             buf = pkt->data;
     334             : 
     335             :             /* calc optimal new charset + charmaps */
     336           0 :             ret = avpriv_init_elbg(meta, 32, 1000 * c->mc_lifetime, best_cb,
     337             :                                CHARSET_CHARS, 50, charmap, &c->randctx);
     338           0 :             if (ret < 0)
     339           0 :                 return ret;
     340           0 :             ret = avpriv_do_elbg(meta, 32, 1000 * c->mc_lifetime, best_cb,
     341             :                              CHARSET_CHARS, 50, charmap, &c->randctx);
     342           0 :             if (ret < 0)
     343           0 :                 return ret;
     344             : 
     345             :             /* create colorram map and a c64 readable charset */
     346           0 :             render_charset(avctx, charset, colram);
     347             : 
     348             :             /* copy charset to buf */
     349           0 :             memcpy(buf, charset, charset_size);
     350             : 
     351             :             /* advance pointers */
     352           0 :             buf      += charset_size;
     353           0 :             req_size += charset_size;
     354             :         }
     355             : 
     356             :         /* write x frames to buf */
     357           0 :         for (frame = 0; frame < c->mc_lifetime; frame++) {
     358             :             /* copy charmap to buf. buf is uchar*, charmap is int*, so no memcpy here, sorry */
     359           0 :             for (y = 0; y < b_height; y++) {
     360           0 :                 for (x = 0; x < b_width; x++) {
     361           0 :                     buf[y * b_width + x] = charmap[y * b_width + x];
     362             :                 }
     363             :             }
     364             :             /* advance pointers */
     365           0 :             buf += screen_size;
     366           0 :             req_size += screen_size;
     367             : 
     368             :             /* compress and copy colram to buf */
     369           0 :             if (c->mc_use_5col) {
     370           0 :                 a64_compress_colram(buf, charmap, colram);
     371             :                 /* advance pointers */
     372           0 :                 buf += colram_size;
     373           0 :                 req_size += colram_size;
     374             :             }
     375             : 
     376             :             /* advance to next charmap */
     377           0 :             charmap += 1000;
     378             :         }
     379             : 
     380           0 :         AV_WB32(avctx->extradata + 4,  c->mc_frame_counter);
     381           0 :         AV_WB32(avctx->extradata + 8,  charset_size);
     382           0 :         AV_WB32(avctx->extradata + 12, screen_size + colram_size);
     383             : 
     384             :         /* reset counter */
     385           0 :         c->mc_frame_counter = 0;
     386             : 
     387           0 :         pkt->pts = pkt->dts = c->next_pts;
     388           0 :         c->next_pts         = AV_NOPTS_VALUE;
     389             : 
     390           0 :         av_assert0(pkt->size >= req_size);
     391           0 :         pkt->size   = req_size;
     392           0 :         pkt->flags |= AV_PKT_FLAG_KEY;
     393           0 :         *got_packet = !!req_size;
     394             :     }
     395           0 :     return 0;
     396             : }
     397             : 
     398             : #if CONFIG_A64MULTI_ENCODER
     399             : AVCodec ff_a64multi_encoder = {
     400             :     .name           = "a64multi",
     401             :     .long_name      = NULL_IF_CONFIG_SMALL("Multicolor charset for Commodore 64"),
     402             :     .type           = AVMEDIA_TYPE_VIDEO,
     403             :     .id             = AV_CODEC_ID_A64_MULTI,
     404             :     .priv_data_size = sizeof(A64Context),
     405             :     .init           = a64multi_encode_init,
     406             :     .encode2        = a64multi_encode_frame,
     407             :     .close          = a64multi_close_encoder,
     408             :     .pix_fmts       = (const enum AVPixelFormat[]) {AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE},
     409             :     .capabilities   = AV_CODEC_CAP_DELAY,
     410             : };
     411             : #endif
     412             : #if CONFIG_A64MULTI5_ENCODER
     413             : AVCodec ff_a64multi5_encoder = {
     414             :     .name           = "a64multi5",
     415             :     .long_name      = NULL_IF_CONFIG_SMALL("Multicolor charset for Commodore 64, extended with 5th color (colram)"),
     416             :     .type           = AVMEDIA_TYPE_VIDEO,
     417             :     .id             = AV_CODEC_ID_A64_MULTI5,
     418             :     .priv_data_size = sizeof(A64Context),
     419             :     .init           = a64multi_encode_init,
     420             :     .encode2        = a64multi_encode_frame,
     421             :     .close          = a64multi_close_encoder,
     422             :     .pix_fmts       = (const enum AVPixelFormat[]) {AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE},
     423             :     .capabilities   = AV_CODEC_CAP_DELAY,
     424             : };
     425             : #endif

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