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00027 #include "a64enc.h"
00028 #include "a64colors.h"
00029 #include "a64tables.h"
00030 #include "elbg.h"
00031 #include "libavutil/intreadwrite.h"
00032
00033 #define DITHERSTEPS 8
00034 #define CHARSET_CHARS 256
00035 #define INTERLACED 1
00036 #define CROP_SCREENS 1
00037
00038
00039 static const int mc_colors[5]={0x0,0xb,0xc,0xf,0x1};
00040
00041
00042
00043
00044
00045 static void to_meta_with_crop(AVCodecContext *avctx, AVFrame *p, int *dest)
00046 {
00047 int blockx, blocky, x, y;
00048 int luma = 0;
00049 int height = FFMIN(avctx->height, C64YRES);
00050 int width = FFMIN(avctx->width , C64XRES);
00051 uint8_t *src = p->data[0];
00052
00053 for (blocky = 0; blocky < C64YRES; blocky += 8) {
00054 for (blockx = 0; blockx < C64XRES; blockx += 8) {
00055 for (y = blocky; y < blocky + 8 && y < C64YRES; y++) {
00056 for (x = blockx; x < blockx + 8 && x < C64XRES; x += 2) {
00057 if(x < width && y < height) {
00058
00059 luma = (src[(x + 0 + y * p->linesize[0])] +
00060 src[(x + 1 + y * p->linesize[0])]) / 2;
00061
00062 dest[0] = luma;
00063 }
00064 dest++;
00065 }
00066 }
00067 }
00068 }
00069 }
00070
00071 static void render_charset(AVCodecContext *avctx, uint8_t *charset,
00072 uint8_t *colrammap)
00073 {
00074 A64Context *c = avctx->priv_data;
00075 uint8_t row1, row2;
00076 int charpos, x, y;
00077 int a, b;
00078 uint8_t pix;
00079 int lowdiff, highdiff;
00080 int *best_cb = c->mc_best_cb;
00081 static uint8_t index1[256];
00082 static uint8_t index2[256];
00083 static uint8_t dither[256];
00084 int i;
00085 int distance;
00086
00087
00088 i = 0;
00089 for (a=0; a < 256; a++) {
00090 if(i < c->mc_pal_size -1 && a == c->mc_luma_vals[i + 1]) {
00091 distance = c->mc_luma_vals[i + 1] - c->mc_luma_vals[i];
00092 for(b = 0; b <= distance; b++) {
00093 dither[c->mc_luma_vals[i] + b] = b * (DITHERSTEPS - 1) / distance;
00094 }
00095 i++;
00096 }
00097 if(i >= c->mc_pal_size - 1) dither[a] = 0;
00098 index1[a] = i;
00099 index2[a] = FFMIN(i + 1, c->mc_pal_size - 1);
00100 }
00101
00102
00103 for (charpos = 0; charpos < CHARSET_CHARS; charpos++) {
00104 lowdiff = 0;
00105 highdiff = 0;
00106 for (y = 0; y < 8; y++) {
00107 row1 = 0; row2 = 0;
00108 for (x = 0; x < 4; x++) {
00109 pix = best_cb[y * 4 + x];
00110
00111
00112 if (index1[pix] >= 3)
00113 highdiff += pix - c->mc_luma_vals[3];
00114 if (index1[pix] < 1)
00115 lowdiff += c->mc_luma_vals[1] - pix;
00116
00117 row1 <<= 2;
00118
00119 if (INTERLACED) {
00120 row2 <<= 2;
00121 if (interlaced_dither_patterns[dither[pix]][(y & 3) * 2 + 0][x & 3])
00122 row1 |= 3-(index2[pix] & 3);
00123 else
00124 row1 |= 3-(index1[pix] & 3);
00125
00126 if (interlaced_dither_patterns[dither[pix]][(y & 3) * 2 + 1][x & 3])
00127 row2 |= 3-(index2[pix] & 3);
00128 else
00129 row2 |= 3-(index1[pix] & 3);
00130 }
00131 else {
00132 if (multi_dither_patterns[dither[pix]][(y & 3)][x & 3])
00133 row1 |= 3-(index2[pix] & 3);
00134 else
00135 row1 |= 3-(index1[pix] & 3);
00136 }
00137 }
00138 charset[y+0x000] = row1;
00139 if (INTERLACED) charset[y+0x800] = row2;
00140 }
00141
00142 if (highdiff > 0 && lowdiff > 0 && c->mc_use_5col) {
00143 if (lowdiff > highdiff) {
00144 for (x = 0; x < 32; x++)
00145 best_cb[x] = FFMIN(c->mc_luma_vals[3], best_cb[x]);
00146 } else {
00147 for (x = 0; x < 32; x++)
00148 best_cb[x] = FFMAX(c->mc_luma_vals[1], best_cb[x]);
00149 }
00150 charpos--;
00151
00152 } else {
00153
00154 best_cb += 32;
00155 charset += 8;
00156
00157
00158 colrammap[charpos] = (highdiff > 0);
00159 }
00160 }
00161 }
00162
00163 static av_cold int a64multi_close_encoder(AVCodecContext *avctx)
00164 {
00165 A64Context *c = avctx->priv_data;
00166 av_free(c->mc_meta_charset);
00167 av_free(c->mc_best_cb);
00168 av_free(c->mc_charset);
00169 av_free(c->mc_charmap);
00170 av_free(c->mc_colram);
00171 return 0;
00172 }
00173
00174 static av_cold int a64multi_init_encoder(AVCodecContext *avctx)
00175 {
00176 A64Context *c = avctx->priv_data;
00177 int a;
00178 av_lfg_init(&c->randctx, 1);
00179
00180 if (avctx->global_quality < 1) {
00181 c->mc_lifetime = 4;
00182 } else {
00183 c->mc_lifetime = avctx->global_quality /= FF_QP2LAMBDA;
00184 }
00185
00186 av_log(avctx, AV_LOG_INFO, "charset lifetime set to %d frame(s)\n", c->mc_lifetime);
00187
00188 c->mc_frame_counter = 0;
00189 c->mc_use_5col = avctx->codec->id == CODEC_ID_A64_MULTI5;
00190 c->mc_pal_size = 4 + c->mc_use_5col;
00191
00192
00193 for (a = 0; a < c->mc_pal_size; a++) {
00194 c->mc_luma_vals[a]=a64_palette[mc_colors[a]][0] * 0.30 +
00195 a64_palette[mc_colors[a]][1] * 0.59 +
00196 a64_palette[mc_colors[a]][2] * 0.11;
00197 }
00198
00199 if (!(c->mc_meta_charset = av_malloc(32000 * c->mc_lifetime * sizeof(int))) ||
00200 !(c->mc_best_cb = av_malloc(CHARSET_CHARS * 32 * sizeof(int))) ||
00201 !(c->mc_charmap = av_mallocz(1000 * c->mc_lifetime * sizeof(int))) ||
00202 !(c->mc_colram = av_mallocz(CHARSET_CHARS * sizeof(uint8_t))) ||
00203 !(c->mc_charset = av_malloc(0x800 * (INTERLACED+1) * sizeof(uint8_t)))) {
00204 av_log(avctx, AV_LOG_ERROR, "Failed to allocate buffer memory.\n");
00205 return AVERROR(ENOMEM);
00206 }
00207
00208
00209 if (!(avctx->extradata = av_mallocz(8 * 4 + FF_INPUT_BUFFER_PADDING_SIZE))) {
00210 av_log(avctx, AV_LOG_ERROR, "Failed to allocate memory for extradata.\n");
00211 return AVERROR(ENOMEM);
00212 }
00213 avctx->extradata_size = 8 * 4;
00214 AV_WB32(avctx->extradata, c->mc_lifetime);
00215 AV_WB32(avctx->extradata + 16, INTERLACED);
00216
00217 avcodec_get_frame_defaults(&c->picture);
00218 avctx->coded_frame = &c->picture;
00219 avctx->coded_frame->pict_type = FF_I_TYPE;
00220 avctx->coded_frame->key_frame = 1;
00221 if (!avctx->codec_tag)
00222 avctx->codec_tag = AV_RL32("a64m");
00223
00224 return 0;
00225 }
00226
00227 static void a64_compress_colram(unsigned char *buf, int *charmap, uint8_t *colram)
00228 {
00229 int a;
00230 uint8_t temp;
00231
00232
00233 for (a = 0; a < 256; a++) {
00234 temp = colram[charmap[a + 0x000]] << 0;
00235 temp |= colram[charmap[a + 0x100]] << 1;
00236 temp |= colram[charmap[a + 0x200]] << 2;
00237 if (a < 0xe8) temp |= colram[charmap[a + 0x300]] << 3;
00238 buf[a] = temp << 2;
00239 }
00240 }
00241
00242 static int a64multi_encode_frame(AVCodecContext *avctx, unsigned char *buf,
00243 int buf_size, void *data)
00244 {
00245 A64Context *c = avctx->priv_data;
00246 AVFrame *pict = data;
00247 AVFrame *const p = (AVFrame *) & c->picture;
00248
00249 int frame;
00250 int x, y;
00251 int b_height;
00252 int b_width;
00253
00254 int req_size;
00255 int num_frames = c->mc_lifetime;
00256
00257 int *charmap = c->mc_charmap;
00258 uint8_t *colram = c->mc_colram;
00259 uint8_t *charset = c->mc_charset;
00260 int *meta = c->mc_meta_charset;
00261 int *best_cb = c->mc_best_cb;
00262
00263 int charset_size = 0x800 * (INTERLACED + 1);
00264 int colram_size = 0x100 * c->mc_use_5col;
00265 int screen_size;
00266
00267 if(CROP_SCREENS) {
00268 b_height = FFMIN(avctx->height,C64YRES) >> 3;
00269 b_width = FFMIN(avctx->width ,C64XRES) >> 3;
00270 screen_size = b_width * b_height;
00271 } else {
00272 b_height = C64YRES >> 3;
00273 b_width = C64XRES >> 3;
00274 screen_size = 0x400;
00275 }
00276
00277
00278 if (!data) {
00279
00280 if (!c->mc_lifetime) return 0;
00281
00282 if (!c->mc_frame_counter) {
00283 num_frames = c->mc_lifetime;
00284 c->mc_lifetime = 0;
00285 }
00286
00287 else c->mc_lifetime = c->mc_frame_counter;
00288
00289 } else {
00290
00291 if (c->mc_frame_counter < c->mc_lifetime) {
00292 *p = *pict;
00293 p->pict_type = FF_I_TYPE;
00294 p->key_frame = 1;
00295 to_meta_with_crop(avctx, p, meta + 32000 * c->mc_frame_counter);
00296 c->mc_frame_counter++;
00297
00298 return 0;
00299 }
00300 }
00301
00302
00303 if (c->mc_frame_counter == c->mc_lifetime) {
00304 req_size = 0;
00305
00306 if (c->mc_lifetime) {
00307
00308 ff_init_elbg(meta, 32, 1000 * c->mc_lifetime, best_cb, CHARSET_CHARS, 50, charmap, &c->randctx);
00309 ff_do_elbg (meta, 32, 1000 * c->mc_lifetime, best_cb, CHARSET_CHARS, 50, charmap, &c->randctx);
00310
00311
00312 render_charset(avctx, charset, colram);
00313
00314
00315 memcpy(buf,charset, charset_size);
00316
00317
00318 buf += charset_size;
00319 charset += charset_size;
00320 req_size += charset_size;
00321 }
00322
00323 else memset(buf, 0, charset_size);
00324
00325
00326 for (frame = 0; frame < c->mc_lifetime; frame++) {
00327
00328 for (y = 0; y < b_height; y++) {
00329 for (x = 0; x < b_width; x++) {
00330 buf[y * b_width + x] = charmap[y * b_width + x];
00331 }
00332 }
00333
00334 buf += screen_size;
00335 req_size += screen_size;
00336
00337
00338 if (c->mc_use_5col) {
00339 a64_compress_colram(buf, charmap, colram);
00340
00341 buf += colram_size;
00342 req_size += colram_size;
00343 }
00344
00345
00346 charmap += 1000;
00347 }
00348
00349 AV_WB32(avctx->extradata + 4, c->mc_frame_counter);
00350 AV_WB32(avctx->extradata + 8, charset_size);
00351 AV_WB32(avctx->extradata + 12, screen_size + colram_size);
00352
00353
00354 c->mc_frame_counter = 0;
00355
00356 if (req_size > buf_size) {
00357 av_log(avctx, AV_LOG_ERROR, "buf size too small (need %d, got %d)\n", req_size, buf_size);
00358 return -1;
00359 }
00360 return req_size;
00361 }
00362 return 0;
00363 }
00364
00365 AVCodec ff_a64multi_encoder = {
00366 .name = "a64multi",
00367 .type = AVMEDIA_TYPE_VIDEO,
00368 .id = CODEC_ID_A64_MULTI,
00369 .priv_data_size = sizeof(A64Context),
00370 .init = a64multi_init_encoder,
00371 .encode = a64multi_encode_frame,
00372 .close = a64multi_close_encoder,
00373 .pix_fmts = (const enum PixelFormat[]) {PIX_FMT_GRAY8, PIX_FMT_NONE},
00374 .long_name = NULL_IF_CONFIG_SMALL("Multicolor charset for Commodore 64"),
00375 .capabilities = CODEC_CAP_DELAY,
00376 };
00377
00378 AVCodec ff_a64multi5_encoder = {
00379 .name = "a64multi5",
00380 .type = AVMEDIA_TYPE_VIDEO,
00381 .id = CODEC_ID_A64_MULTI5,
00382 .priv_data_size = sizeof(A64Context),
00383 .init = a64multi_init_encoder,
00384 .encode = a64multi_encode_frame,
00385 .close = a64multi_close_encoder,
00386 .pix_fmts = (const enum PixelFormat[]) {PIX_FMT_GRAY8, PIX_FMT_NONE},
00387 .long_name = NULL_IF_CONFIG_SMALL("Multicolor charset for Commodore 64, extended with 5th color (colram)"),
00388 .capabilities = CODEC_CAP_DELAY,
00389 };