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467 lines
15 KiB
467 lines
15 KiB
/* |
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* ASCII/ANSI art decoder |
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* Copyright (c) 2010 Peter Ross <pross@xvid.org> |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/** |
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* @file |
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* ASCII/ANSI art decoder |
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*/ |
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#include "libavutil/common.h" |
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#include "libavutil/lfg.h" |
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#include "libavutil/xga_font_data.h" |
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#include "avcodec.h" |
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#include "cga_data.h" |
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#define ATTR_BOLD 0x01 /**< Bold/Bright-foreground (mode 1) */ |
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#define ATTR_FAINT 0x02 /**< Faint (mode 2) */ |
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#define ATTR_UNDERLINE 0x08 /**< Underline (mode 4) */ |
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#define ATTR_BLINK 0x10 /**< Blink/Bright-background (mode 5) */ |
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#define ATTR_REVERSE 0x40 /**< Reverse (mode 7) */ |
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#define ATTR_CONCEALED 0x80 /**< Concealed (mode 8) */ |
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#define DEFAULT_FG_COLOR 7 /**< CGA color index */ |
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#define DEFAULT_BG_COLOR 0 |
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#define DEFAULT_SCREEN_MODE 3 /**< 80x25 */ |
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#define FONT_WIDTH 8 /**< Font width */ |
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/** map ansi color index to cga palette index */ |
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static const uint8_t ansi_to_cga[16] = { |
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0, 4, 2, 6, 1, 5, 3, 7, 8, 12, 10, 14, 9, 13, 11, 15 |
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}; |
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typedef struct { |
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AVFrame frame; |
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int x; /**< x cursor position (pixels) */ |
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int y; /**< y cursor position (pixels) */ |
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int sx; /**< saved x cursor position (pixels) */ |
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int sy; /**< saved y cursor position (pixels) */ |
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const uint8_t* font; /**< font */ |
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int font_height; /**< font height */ |
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int attributes; /**< attribute flags */ |
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int fg; /**< foreground color */ |
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int bg; /**< background color */ |
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int first_frame; |
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/* ansi parser state machine */ |
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enum { |
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STATE_NORMAL = 0, |
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STATE_ESCAPE, |
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STATE_CODE, |
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STATE_MUSIC_PREAMBLE |
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} state; |
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#define MAX_NB_ARGS 4 |
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int args[MAX_NB_ARGS]; |
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int nb_args; /**< number of arguments (may exceed MAX_NB_ARGS) */ |
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} AnsiContext; |
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static av_cold int decode_init(AVCodecContext *avctx) |
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{ |
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AnsiContext *s = avctx->priv_data; |
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avctx->pix_fmt = AV_PIX_FMT_PAL8; |
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|
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/* defaults */ |
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s->font = avpriv_vga16_font; |
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s->font_height = 16; |
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s->fg = DEFAULT_FG_COLOR; |
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s->bg = DEFAULT_BG_COLOR; |
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avcodec_get_frame_defaults(&s->frame); |
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if (!avctx->width || !avctx->height) |
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avcodec_set_dimensions(avctx, 80<<3, 25<<4); |
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return 0; |
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} |
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static void set_palette(uint32_t *pal) |
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{ |
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int r, g, b; |
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memcpy(pal, ff_cga_palette, 16 * 4); |
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pal += 16; |
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#define COLOR(x) ((x) * 40 + 55) |
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for (r = 0; r < 6; r++) |
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for (g = 0; g < 6; g++) |
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for (b = 0; b < 6; b++) |
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*pal++ = 0xFF000000 | (COLOR(r) << 16) | (COLOR(g) << 8) | COLOR(b); |
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#define GRAY(x) ((x) * 10 + 8) |
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for (g = 0; g < 24; g++) |
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*pal++ = 0xFF000000 | (GRAY(g) << 16) | (GRAY(g) << 8) | GRAY(g); |
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} |
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static void hscroll(AVCodecContext *avctx) |
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{ |
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AnsiContext *s = avctx->priv_data; |
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int i; |
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if (s->y < avctx->height - s->font_height) { |
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s->y += s->font_height; |
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return; |
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} |
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i = 0; |
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for (; i < avctx->height - s->font_height; i++) |
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memcpy(s->frame.data[0] + i * s->frame.linesize[0], |
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s->frame.data[0] + (i + s->font_height) * s->frame.linesize[0], |
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avctx->width); |
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for (; i < avctx->height; i++) |
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memset(s->frame.data[0] + i * s->frame.linesize[0], |
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DEFAULT_BG_COLOR, avctx->width); |
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} |
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static void erase_line(AVCodecContext * avctx, int xoffset, int xlength) |
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{ |
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AnsiContext *s = avctx->priv_data; |
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int i; |
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for (i = 0; i < s->font_height; i++) |
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memset(s->frame.data[0] + (s->y + i)*s->frame.linesize[0] + xoffset, |
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DEFAULT_BG_COLOR, xlength); |
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} |
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static void erase_screen(AVCodecContext *avctx) |
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{ |
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AnsiContext *s = avctx->priv_data; |
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int i; |
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for (i = 0; i < avctx->height; i++) |
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memset(s->frame.data[0] + i * s->frame.linesize[0], DEFAULT_BG_COLOR, avctx->width); |
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s->x = s->y = 0; |
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} |
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/** |
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* Draw character to screen |
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*/ |
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static void draw_char(AVCodecContext *avctx, int c) |
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{ |
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AnsiContext *s = avctx->priv_data; |
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int fg = s->fg; |
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int bg = s->bg; |
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if ((s->attributes & ATTR_BOLD)) |
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fg += 8; |
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if ((s->attributes & ATTR_BLINK)) |
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bg += 8; |
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if ((s->attributes & ATTR_REVERSE)) |
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FFSWAP(int, fg, bg); |
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if ((s->attributes & ATTR_CONCEALED)) |
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fg = bg; |
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ff_draw_pc_font(s->frame.data[0] + s->y * s->frame.linesize[0] + s->x, |
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s->frame.linesize[0], s->font, s->font_height, c, fg, bg); |
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s->x += FONT_WIDTH; |
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if (s->x >= avctx->width) { |
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s->x = 0; |
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hscroll(avctx); |
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} |
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} |
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/** |
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* Execute ANSI escape code |
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* @return 0 on success, negative on error |
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*/ |
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static int execute_code(AVCodecContext * avctx, int c) |
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{ |
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AnsiContext *s = avctx->priv_data; |
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int ret, i, width, height; |
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switch(c) { |
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case 'A': //Cursor Up |
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s->y = FFMAX(s->y - (s->nb_args > 0 ? s->args[0]*s->font_height : s->font_height), 0); |
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break; |
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case 'B': //Cursor Down |
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s->y = FFMIN(s->y + (s->nb_args > 0 ? s->args[0]*s->font_height : s->font_height), avctx->height - s->font_height); |
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break; |
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case 'C': //Cursor Right |
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s->x = FFMIN(s->x + (s->nb_args > 0 ? s->args[0]*FONT_WIDTH : FONT_WIDTH), avctx->width - FONT_WIDTH); |
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break; |
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case 'D': //Cursor Left |
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s->x = FFMAX(s->x - (s->nb_args > 0 ? s->args[0]*FONT_WIDTH : FONT_WIDTH), 0); |
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break; |
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case 'H': //Cursor Position |
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case 'f': //Horizontal and Vertical Position |
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s->y = s->nb_args > 0 ? av_clip((s->args[0] - 1)*s->font_height, 0, avctx->height - s->font_height) : 0; |
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s->x = s->nb_args > 1 ? av_clip((s->args[1] - 1)*FONT_WIDTH, 0, avctx->width - FONT_WIDTH) : 0; |
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break; |
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case 'h': //set creen mode |
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case 'l': //reset screen mode |
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if (s->nb_args < 2) |
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s->args[0] = DEFAULT_SCREEN_MODE; |
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width = avctx->width; |
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height = avctx->height; |
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switch(s->args[0]) { |
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case 0: case 1: case 4: case 5: case 13: case 19: //320x200 (25 rows) |
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s->font = avpriv_cga_font; |
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s->font_height = 8; |
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width = 40<<3; |
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height = 25<<3; |
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break; |
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case 2: case 3: //640x400 (25 rows) |
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s->font = avpriv_vga16_font; |
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s->font_height = 16; |
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width = 80<<3; |
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height = 25<<4; |
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break; |
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case 6: case 14: //640x200 (25 rows) |
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s->font = avpriv_cga_font; |
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s->font_height = 8; |
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width = 80<<3; |
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height = 25<<3; |
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break; |
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case 7: //set line wrapping |
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break; |
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case 15: case 16: //640x350 (43 rows) |
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s->font = avpriv_cga_font; |
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s->font_height = 8; |
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width = 80<<3; |
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height = 43<<3; |
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break; |
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case 17: case 18: //640x480 (60 rows) |
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s->font = avpriv_cga_font; |
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s->font_height = 8; |
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width = 80<<3; |
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height = 60<<4; |
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break; |
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default: |
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av_log_ask_for_sample(avctx, "unsupported screen mode\n"); |
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} |
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if (width != avctx->width || height != avctx->height) { |
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if (s->frame.data[0]) |
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avctx->release_buffer(avctx, &s->frame); |
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avcodec_set_dimensions(avctx, width, height); |
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ret = avctx->get_buffer(avctx, &s->frame); |
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if (ret < 0) { |
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); |
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return ret; |
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} |
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s->frame.pict_type = AV_PICTURE_TYPE_I; |
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s->frame.palette_has_changed = 1; |
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set_palette((uint32_t *)s->frame.data[1]); |
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erase_screen(avctx); |
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} else if (c == 'l') { |
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erase_screen(avctx); |
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} |
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break; |
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case 'J': //Erase in Page |
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switch (s->args[0]) { |
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case 0: |
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erase_line(avctx, s->x, avctx->width - s->x); |
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if (s->y < avctx->height - s->font_height) |
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memset(s->frame.data[0] + (s->y + s->font_height)*s->frame.linesize[0], |
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DEFAULT_BG_COLOR, (avctx->height - s->y - s->font_height)*s->frame.linesize[0]); |
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break; |
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case 1: |
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erase_line(avctx, 0, s->x); |
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if (s->y > 0) |
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memset(s->frame.data[0], DEFAULT_BG_COLOR, s->y * s->frame.linesize[0]); |
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break; |
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case 2: |
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erase_screen(avctx); |
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} |
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break; |
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case 'K': //Erase in Line |
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switch(s->args[0]) { |
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case 0: |
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erase_line(avctx, s->x, avctx->width - s->x); |
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break; |
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case 1: |
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erase_line(avctx, 0, s->x); |
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break; |
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case 2: |
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erase_line(avctx, 0, avctx->width); |
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} |
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break; |
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case 'm': //Select Graphics Rendition |
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if (s->nb_args == 0) { |
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s->nb_args = 1; |
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s->args[0] = 0; |
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} |
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for (i = 0; i < FFMIN(s->nb_args, MAX_NB_ARGS); i++) { |
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int m = s->args[i]; |
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if (m == 0) { |
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s->attributes = 0; |
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s->fg = DEFAULT_FG_COLOR; |
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s->bg = DEFAULT_BG_COLOR; |
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} else if (m == 1 || m == 2 || m == 4 || m == 5 || m == 7 || m == 8) { |
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s->attributes |= 1 << (m - 1); |
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} else if (m >= 30 && m <= 37) { |
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s->fg = ansi_to_cga[m - 30]; |
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} else if (m == 38 && i + 2 < s->nb_args && s->args[i + 1] == 5 && s->args[i + 2] < 256) { |
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int index = s->args[i + 2]; |
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s->fg = index < 16 ? ansi_to_cga[index] : index; |
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i += 2; |
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} else if (m == 39) { |
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s->fg = ansi_to_cga[DEFAULT_FG_COLOR]; |
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} else if (m >= 40 && m <= 47) { |
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s->bg = ansi_to_cga[m - 40]; |
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} else if (m == 48 && i + 2 < s->nb_args && s->args[i + 1] == 5 && s->args[i + 2] < 256) { |
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int index = s->args[i + 2]; |
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s->bg = index < 16 ? ansi_to_cga[index] : index; |
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i += 2; |
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} else if (m == 49) { |
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s->fg = ansi_to_cga[DEFAULT_BG_COLOR]; |
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} else { |
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av_log_ask_for_sample(avctx, "unsupported rendition parameter\n"); |
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} |
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} |
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break; |
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case 'n': //Device Status Report |
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case 'R': //report current line and column |
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/* ignore */ |
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break; |
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case 's': //Save Cursor Position |
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s->sx = s->x; |
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s->sy = s->y; |
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break; |
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case 'u': //Restore Cursor Position |
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s->x = av_clip(s->sx, 0, avctx->width - FONT_WIDTH); |
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s->y = av_clip(s->sy, 0, avctx->height - s->font_height); |
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break; |
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default: |
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av_log_ask_for_sample(avctx, "unsupported escape code\n"); |
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break; |
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} |
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return 0; |
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} |
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static int decode_frame(AVCodecContext *avctx, |
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void *data, int *data_size, |
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AVPacket *avpkt) |
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{ |
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AnsiContext *s = avctx->priv_data; |
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uint8_t *buf = avpkt->data; |
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int buf_size = avpkt->size; |
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const uint8_t *buf_end = buf+buf_size; |
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int ret, i, count; |
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ret = avctx->reget_buffer(avctx, &s->frame); |
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if (ret < 0){ |
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); |
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return ret; |
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} |
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s->frame.pict_type = AV_PICTURE_TYPE_I; |
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s->frame.palette_has_changed = 1; |
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set_palette((uint32_t *)s->frame.data[1]); |
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if (!s->first_frame) { |
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erase_screen(avctx); |
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s->first_frame = 1; |
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} |
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while(buf < buf_end) { |
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switch(s->state) { |
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case STATE_NORMAL: |
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switch (buf[0]) { |
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case 0x00: //NUL |
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case 0x07: //BEL |
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case 0x1A: //SUB |
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/* ignore */ |
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break; |
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case 0x08: //BS |
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s->x = FFMAX(s->x - 1, 0); |
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break; |
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case 0x09: //HT |
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i = s->x / FONT_WIDTH; |
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count = ((i + 8) & ~7) - i; |
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for (i = 0; i < count; i++) |
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draw_char(avctx, ' '); |
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break; |
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case 0x0A: //LF |
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hscroll(avctx); |
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case 0x0D: //CR |
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s->x = 0; |
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break; |
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case 0x0C: //FF |
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erase_screen(avctx); |
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break; |
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case 0x1B: //ESC |
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s->state = STATE_ESCAPE; |
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break; |
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default: |
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draw_char(avctx, buf[0]); |
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} |
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break; |
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case STATE_ESCAPE: |
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if (buf[0] == '[') { |
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s->state = STATE_CODE; |
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s->nb_args = 0; |
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s->args[0] = -1; |
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} else { |
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s->state = STATE_NORMAL; |
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draw_char(avctx, 0x1B); |
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continue; |
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} |
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break; |
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case STATE_CODE: |
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switch(buf[0]) { |
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case '0': case '1': case '2': case '3': case '4': |
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case '5': case '6': case '7': case '8': case '9': |
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if (s->nb_args < MAX_NB_ARGS) |
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s->args[s->nb_args] = FFMAX(s->args[s->nb_args], 0) * 10 + buf[0] - '0'; |
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break; |
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case ';': |
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s->nb_args++; |
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if (s->nb_args < MAX_NB_ARGS) |
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s->args[s->nb_args] = 0; |
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break; |
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case 'M': |
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s->state = STATE_MUSIC_PREAMBLE; |
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break; |
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case '=': case '?': |
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/* ignore */ |
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break; |
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default: |
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if (s->nb_args > MAX_NB_ARGS) |
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av_log(avctx, AV_LOG_WARNING, "args overflow (%i)\n", s->nb_args); |
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if (s->nb_args < MAX_NB_ARGS && s->args[s->nb_args] >= 0) |
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s->nb_args++; |
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if (execute_code(avctx, buf[0]) < 0) |
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return -1; |
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s->state = STATE_NORMAL; |
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} |
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break; |
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case STATE_MUSIC_PREAMBLE: |
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if (buf[0] == 0x0E || buf[0] == 0x1B) |
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s->state = STATE_NORMAL; |
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/* ignore music data */ |
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break; |
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} |
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buf++; |
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} |
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*data_size = sizeof(AVFrame); |
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*(AVFrame*)data = s->frame; |
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return buf_size; |
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} |
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static av_cold int decode_close(AVCodecContext *avctx) |
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{ |
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AnsiContext *s = avctx->priv_data; |
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if (s->frame.data[0]) |
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avctx->release_buffer(avctx, &s->frame); |
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return 0; |
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} |
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AVCodec ff_ansi_decoder = { |
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.name = "ansi", |
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.type = AVMEDIA_TYPE_VIDEO, |
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.id = AV_CODEC_ID_ANSI, |
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.priv_data_size = sizeof(AnsiContext), |
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.init = decode_init, |
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.close = decode_close, |
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.decode = decode_frame, |
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.capabilities = CODEC_CAP_DR1, |
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.long_name = NULL_IF_CONFIG_SMALL("ASCII/ANSI art"), |
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};
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