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00027 #include "libavutil/lfg.h"
00028 #include "avcodec.h"
00029 #include "cga_data.h"
00030
00031 #define ATTR_BOLD 0x01
00032 #define ATTR_FAINT 0x02
00033 #define ATTR_UNDERLINE 0x08
00034 #define ATTR_BLINK 0x10
00035 #define ATTR_REVERSE 0x40
00036 #define ATTR_CONCEALED 0x80
00038 #define DEFAULT_FG_COLOR 7
00039 #define DEFAULT_BG_COLOR 0
00040 #define DEFAULT_SCREEN_MODE 3
00042 #define FONT_WIDTH 8
00045 static const uint8_t ansi_to_cga[16] = {
00046 0, 4, 2, 6, 1, 5, 3, 7, 8, 12, 10, 14, 9, 13, 11, 15
00047 };
00048
00049 typedef struct {
00050 AVFrame frame;
00051 int x;
00052 int y;
00053 int sx;
00054 int sy;
00055 const uint8_t* font;
00056 int font_height;
00057 int attributes;
00058 int fg;
00059 int bg;
00061
00062 enum {
00063 STATE_NORMAL = 0,
00064 STATE_ESCAPE,
00065 STATE_CODE,
00066 STATE_MUSIC_PREAMBLE
00067 } state;
00068 #define MAX_NB_ARGS 4
00069 int args[MAX_NB_ARGS];
00070 int nb_args;
00071 } AnsiContext;
00072
00073 static av_cold int decode_init(AVCodecContext *avctx)
00074 {
00075 AnsiContext *s = avctx->priv_data;
00076 avctx->pix_fmt = PIX_FMT_PAL8;
00077
00078
00079 s->font = ff_vga16_font;
00080 s->font_height = 16;
00081 s->fg = DEFAULT_FG_COLOR;
00082 s->bg = DEFAULT_BG_COLOR;
00083
00084 if (!avctx->width || !avctx->height)
00085 avcodec_set_dimensions(avctx, 80<<3, 25<<4);
00086
00087 return 0;
00088 }
00089
00090 static void hscroll(AVCodecContext *avctx)
00091 {
00092 AnsiContext *s = avctx->priv_data;
00093 int i;
00094
00095 if (s->y < avctx->height - s->font_height) {
00096 s->y += s->font_height;
00097 return;
00098 }
00099
00100 i = 0;
00101 for (; i < avctx->height - s->font_height; i++)
00102 memcpy(s->frame.data[0] + i * s->frame.linesize[0],
00103 s->frame.data[0] + (i + s->font_height) * s->frame.linesize[0],
00104 avctx->width);
00105 for (; i < avctx->height; i++)
00106 memset(s->frame.data[0] + i * s->frame.linesize[0],
00107 DEFAULT_BG_COLOR, avctx->width);
00108 }
00109
00110 static void erase_line(AVCodecContext * avctx, int xoffset, int xlength)
00111 {
00112 AnsiContext *s = avctx->priv_data;
00113 int i;
00114 for (i = 0; i < s->font_height; i++)
00115 memset(s->frame.data[0] + (s->y + i)*s->frame.linesize[0] + xoffset,
00116 DEFAULT_BG_COLOR, xlength);
00117 }
00118
00119 static void erase_screen(AVCodecContext *avctx)
00120 {
00121 AnsiContext *s = avctx->priv_data;
00122 int i;
00123 for (i = 0; i < avctx->height; i++)
00124 memset(s->frame.data[0] + i * s->frame.linesize[0], DEFAULT_BG_COLOR, avctx->width);
00125 s->x = s->y = 0;
00126 }
00127
00131 static void draw_char(AVCodecContext *avctx, int c)
00132 {
00133 AnsiContext *s = avctx->priv_data;
00134 int fg = s->fg;
00135 int bg = s->bg;
00136
00137 if ((s->attributes & ATTR_BOLD))
00138 fg += 8;
00139 if ((s->attributes & ATTR_BLINK))
00140 bg += 8;
00141 if ((s->attributes & ATTR_REVERSE))
00142 FFSWAP(int, fg, bg);
00143 if ((s->attributes & ATTR_CONCEALED))
00144 fg = bg;
00145 ff_draw_pc_font(s->frame.data[0] + s->y * s->frame.linesize[0] + s->x,
00146 s->frame.linesize[0], s->font, s->font_height, c, fg, bg);
00147 s->x += FONT_WIDTH;
00148 if (s->x >= avctx->width) {
00149 s->x = 0;
00150 hscroll(avctx);
00151 }
00152 }
00153
00158 static int execute_code(AVCodecContext * avctx, int c)
00159 {
00160 AnsiContext *s = avctx->priv_data;
00161 int ret, i, width, height;
00162 switch(c) {
00163 case 'A':
00164 s->y = FFMAX(s->y - (s->nb_args > 0 ? s->args[0]*s->font_height : s->font_height), 0);
00165 break;
00166 case 'B':
00167 s->y = FFMIN(s->y + (s->nb_args > 0 ? s->args[0]*s->font_height : s->font_height), avctx->height - s->font_height);
00168 break;
00169 case 'C':
00170 s->x = FFMIN(s->x + (s->nb_args > 0 ? s->args[0]*FONT_WIDTH : FONT_WIDTH), avctx->width - FONT_WIDTH);
00171 break;
00172 case 'D':
00173 s->x = FFMAX(s->x - (s->nb_args > 0 ? s->args[0]*FONT_WIDTH : FONT_WIDTH), 0);
00174 break;
00175 case 'H':
00176 case 'f':
00177 s->y = s->nb_args > 0 ? av_clip((s->args[0] - 1)*s->font_height, 0, avctx->height - s->font_height) : 0;
00178 s->x = s->nb_args > 1 ? av_clip((s->args[1] - 1)*FONT_WIDTH, 0, avctx->width - FONT_WIDTH) : 0;
00179 break;
00180 case 'h':
00181 case 'l':
00182 if (s->nb_args < 2)
00183 s->args[0] = DEFAULT_SCREEN_MODE;
00184 switch(s->args[0]) {
00185 case 0: case 1: case 4: case 5: case 13: case 19:
00186 s->font = ff_cga_font;
00187 s->font_height = 8;
00188 width = 40<<3;
00189 height = 25<<3;
00190 break;
00191 case 2: case 3:
00192 s->font = ff_vga16_font;
00193 s->font_height = 16;
00194 width = 80<<3;
00195 height = 25<<4;
00196 break;
00197 case 6: case 14:
00198 s->font = ff_cga_font;
00199 s->font_height = 8;
00200 width = 80<<3;
00201 height = 25<<3;
00202 break;
00203 case 7:
00204 break;
00205 case 15: case 16:
00206 s->font = ff_cga_font;
00207 s->font_height = 8;
00208 width = 80<<3;
00209 height = 43<<3;
00210 break;
00211 case 17: case 18:
00212 s->font = ff_cga_font;
00213 s->font_height = 8;
00214 width = 80<<3;
00215 height = 60<<4;
00216 break;
00217 default:
00218 av_log_ask_for_sample(avctx, "unsupported screen mode\n");
00219 }
00220 if (width != avctx->width || height != avctx->height) {
00221 if (s->frame.data[0])
00222 avctx->release_buffer(avctx, &s->frame);
00223 avcodec_set_dimensions(avctx, width, height);
00224 ret = avctx->get_buffer(avctx, &s->frame);
00225 if (ret < 0) {
00226 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00227 return ret;
00228 }
00229 s->frame.pict_type = FF_I_TYPE;
00230 s->frame.palette_has_changed = 1;
00231 memcpy(s->frame.data[1], ff_cga_palette, 16 * 4);
00232 erase_screen(avctx);
00233 } else if (c == 'l') {
00234 erase_screen(avctx);
00235 }
00236 break;
00237 case 'J':
00238 switch (s->args[0]) {
00239 case 0:
00240 erase_line(avctx, s->x, avctx->width - s->x);
00241 if (s->y < avctx->height - s->font_height)
00242 memset(s->frame.data[0] + (s->y + s->font_height)*s->frame.linesize[0],
00243 DEFAULT_BG_COLOR, (avctx->height - s->y - s->font_height)*s->frame.linesize[0]);
00244 break;
00245 case 1:
00246 erase_line(avctx, 0, s->x);
00247 if (s->y > 0)
00248 memset(s->frame.data[0], DEFAULT_BG_COLOR, s->y * s->frame.linesize[0]);
00249 break;
00250 case 2:
00251 erase_screen(avctx);
00252 }
00253 break;
00254 case 'K':
00255 switch(s->args[0]) {
00256 case 0:
00257 erase_line(avctx, s->x, avctx->width - s->x);
00258 break;
00259 case 1:
00260 erase_line(avctx, 0, s->x);
00261 break;
00262 case 2:
00263 erase_line(avctx, 0, avctx->width);
00264 }
00265 break;
00266 case 'm':
00267 if (s->nb_args == 0) {
00268 s->nb_args = 1;
00269 s->args[0] = 0;
00270 }
00271 for (i = 0; i < FFMIN(s->nb_args, MAX_NB_ARGS); i++) {
00272 int m = s->args[i];
00273 if (m == 0) {
00274 s->attributes = 0;
00275 s->fg = DEFAULT_FG_COLOR;
00276 s->bg = DEFAULT_BG_COLOR;
00277 } else if (m == 1 || m == 2 || m == 4 || m == 5 || m == 7 || m == 8) {
00278 s->attributes |= 1 << (m - 1);
00279 } else if (m >= 30 && m <= 38) {
00280 s->fg = ansi_to_cga[m - 30];
00281 } else if (m == 39) {
00282 s->fg = ansi_to_cga[DEFAULT_FG_COLOR];
00283 } else if (m >= 40 && m <= 47) {
00284 s->bg = ansi_to_cga[m - 40];
00285 } else if (m == 49) {
00286 s->fg = ansi_to_cga[DEFAULT_BG_COLOR];
00287 } else {
00288 av_log_ask_for_sample(avctx, "unsupported rendition parameter\n");
00289 }
00290 }
00291 break;
00292 case 'n':
00293 case 'R':
00294
00295 break;
00296 case 's':
00297 s->sx = s->x;
00298 s->sy = s->y;
00299 break;
00300 case 'u':
00301 s->x = av_clip(s->sx, 0, avctx->width - FONT_WIDTH);
00302 s->y = av_clip(s->sy, 0, avctx->height - s->font_height);
00303 break;
00304 default:
00305 av_log_ask_for_sample(avctx, "unsupported escape code\n");
00306 break;
00307 }
00308 return 0;
00309 }
00310
00311 static int decode_frame(AVCodecContext *avctx,
00312 void *data, int *data_size,
00313 AVPacket *avpkt)
00314 {
00315 AnsiContext *s = avctx->priv_data;
00316 uint8_t *buf = avpkt->data;
00317 int buf_size = avpkt->size;
00318 const uint8_t *buf_end = buf+buf_size;
00319 int ret, i, count;
00320
00321 ret = avctx->reget_buffer(avctx, &s->frame);
00322 if (ret < 0){
00323 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00324 return ret;
00325 }
00326 s->frame.pict_type = FF_I_TYPE;
00327 s->frame.palette_has_changed = 1;
00328 memcpy(s->frame.data[1], ff_cga_palette, 16 * 4);
00329
00330 while(buf < buf_end) {
00331 switch(s->state) {
00332 case STATE_NORMAL:
00333 switch (buf[0]) {
00334 case 0x00:
00335 case 0x07:
00336 case 0x1A:
00337
00338 break;
00339 case 0x08:
00340 s->x = FFMAX(s->x - 1, 0);
00341 break;
00342 case 0x09:
00343 i = s->x / FONT_WIDTH;
00344 count = ((i + 8) & ~7) - i;
00345 for (i = 0; i < count; i++)
00346 draw_char(avctx, ' ');
00347 break;
00348 case 0x0A:
00349 hscroll(avctx);
00350 case 0x0D:
00351 s->x = 0;
00352 break;
00353 case 0x0C:
00354 erase_screen(avctx);
00355 break;
00356 case 0x1B:
00357 s->state = STATE_ESCAPE;
00358 break;
00359 default:
00360 draw_char(avctx, buf[0]);
00361 }
00362 break;
00363 case STATE_ESCAPE:
00364 if (buf[0] == '[') {
00365 s->state = STATE_CODE;
00366 s->nb_args = 0;
00367 s->args[0] = 0;
00368 } else {
00369 s->state = STATE_NORMAL;
00370 draw_char(avctx, 0x1B);
00371 return -1;
00372 continue;
00373 }
00374 break;
00375 case STATE_CODE:
00376 switch(buf[0]) {
00377 case '0': case '1': case '2': case '3': case '4':
00378 case '5': case '6': case '7': case '8': case '9':
00379 if (s->nb_args < MAX_NB_ARGS)
00380 s->args[s->nb_args] = s->args[s->nb_args] * 10 + buf[0] - '0';
00381 break;
00382 case ';':
00383 s->nb_args++;
00384 if (s->nb_args < MAX_NB_ARGS)
00385 s->args[s->nb_args] = 0;
00386 break;
00387 case 'M':
00388 s->state = STATE_MUSIC_PREAMBLE;
00389 break;
00390 case '=': case '?':
00391
00392 break;
00393 default:
00394 if (s->nb_args > MAX_NB_ARGS)
00395 av_log(avctx, AV_LOG_WARNING, "args overflow (%i)\n", s->nb_args);
00396 if (s->nb_args < MAX_NB_ARGS && s->args[s->nb_args])
00397 s->nb_args++;
00398 if (execute_code(avctx, buf[0]) < 0)
00399 return -1;
00400 s->state = STATE_NORMAL;
00401 }
00402 break;
00403 case STATE_MUSIC_PREAMBLE:
00404 if (buf[0] == 0x0E || buf[0] == 0x1B)
00405 s->state = STATE_NORMAL;
00406
00407 break;
00408 }
00409 buf++;
00410 }
00411
00412 *data_size = sizeof(AVFrame);
00413 *(AVFrame*)data = s->frame;
00414 return buf_size;
00415 }
00416
00417 static av_cold int decode_close(AVCodecContext *avctx)
00418 {
00419 AnsiContext *s = avctx->priv_data;
00420 if (s->frame.data[0])
00421 avctx->release_buffer(avctx, &s->frame);
00422 return 0;
00423 }
00424
00425 AVCodec ff_ansi_decoder = {
00426 .name = "ansi",
00427 .type = AVMEDIA_TYPE_VIDEO,
00428 .id = CODEC_ID_ANSI,
00429 .priv_data_size = sizeof(AnsiContext),
00430 .init = decode_init,
00431 .close = decode_close,
00432 .decode = decode_frame,
00433 .capabilities = CODEC_CAP_DR1,
00434 .long_name = NULL_IF_CONFIG_SMALL("ASCII/ANSI art"),
00435 };