From 8992cb1d0d07edc33d274f6d7924ecdf6f83d994 Mon Sep 17 00:00:00 2001 From: Tim Redfern Date: Thu, 5 Sep 2013 17:57:22 +0100 Subject: making act segmenter --- ffmpeg/libavcodec/ansi.c | 473 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 473 insertions(+) create mode 100644 ffmpeg/libavcodec/ansi.c (limited to 'ffmpeg/libavcodec/ansi.c') diff --git a/ffmpeg/libavcodec/ansi.c b/ffmpeg/libavcodec/ansi.c new file mode 100644 index 0000000..93915f8 --- /dev/null +++ b/ffmpeg/libavcodec/ansi.c @@ -0,0 +1,473 @@ +/* + * ASCII/ANSI art decoder + * Copyright (c) 2010 Peter Ross + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** + * @file + * ASCII/ANSI art decoder + */ + +#include "libavutil/common.h" +#include "libavutil/frame.h" +#include "libavutil/lfg.h" +#include "libavutil/xga_font_data.h" +#include "avcodec.h" +#include "cga_data.h" +#include "internal.h" + +#define ATTR_BOLD 0x01 /**< Bold/Bright-foreground (mode 1) */ +#define ATTR_FAINT 0x02 /**< Faint (mode 2) */ +#define ATTR_UNDERLINE 0x08 /**< Underline (mode 4) */ +#define ATTR_BLINK 0x10 /**< Blink/Bright-background (mode 5) */ +#define ATTR_REVERSE 0x40 /**< Reverse (mode 7) */ +#define ATTR_CONCEALED 0x80 /**< Concealed (mode 8) */ + +#define DEFAULT_FG_COLOR 7 /**< CGA color index */ +#define DEFAULT_BG_COLOR 0 +#define DEFAULT_SCREEN_MODE 3 /**< 80x25 */ + +#define FONT_WIDTH 8 /**< Font width */ + +/** map ansi color index to cga palette index */ +static const uint8_t ansi_to_cga[16] = { + 0, 4, 2, 6, 1, 5, 3, 7, 8, 12, 10, 14, 9, 13, 11, 15 +}; + +typedef struct { + AVFrame *frame; + int x; /**< x cursor position (pixels) */ + int y; /**< y cursor position (pixels) */ + int sx; /**< saved x cursor position (pixels) */ + int sy; /**< saved y cursor position (pixels) */ + const uint8_t* font; /**< font */ + int font_height; /**< font height */ + int attributes; /**< attribute flags */ + int fg; /**< foreground color */ + int bg; /**< background color */ + int first_frame; + + /* ansi parser state machine */ + enum { + STATE_NORMAL = 0, + STATE_ESCAPE, + STATE_CODE, + STATE_MUSIC_PREAMBLE + } state; +#define MAX_NB_ARGS 4 + int args[MAX_NB_ARGS]; + int nb_args; /**< number of arguments (may exceed MAX_NB_ARGS) */ +} AnsiContext; + +static av_cold int decode_init(AVCodecContext *avctx) +{ + AnsiContext *s = avctx->priv_data; + avctx->pix_fmt = AV_PIX_FMT_PAL8; + + s->frame = av_frame_alloc(); + if (!s->frame) + return AVERROR(ENOMEM); + + /* defaults */ + s->font = avpriv_vga16_font; + s->font_height = 16; + s->fg = DEFAULT_FG_COLOR; + s->bg = DEFAULT_BG_COLOR; + + if (!avctx->width || !avctx->height) + avcodec_set_dimensions(avctx, 80<<3, 25<<4); + + return 0; +} + +static void set_palette(uint32_t *pal) +{ + int r, g, b; + memcpy(pal, ff_cga_palette, 16 * 4); + pal += 16; +#define COLOR(x) ((x) * 40 + 55) + for (r = 0; r < 6; r++) + for (g = 0; g < 6; g++) + for (b = 0; b < 6; b++) + *pal++ = 0xFF000000 | (COLOR(r) << 16) | (COLOR(g) << 8) | COLOR(b); +#define GRAY(x) ((x) * 10 + 8) + for (g = 0; g < 24; g++) + *pal++ = 0xFF000000 | (GRAY(g) << 16) | (GRAY(g) << 8) | GRAY(g); +} + +static void hscroll(AVCodecContext *avctx) +{ + AnsiContext *s = avctx->priv_data; + int i; + + if (s->y < avctx->height - s->font_height) { + s->y += s->font_height; + return; + } + + i = 0; + for (; i < avctx->height - s->font_height; i++) + memcpy(s->frame->data[0] + i * s->frame->linesize[0], + s->frame->data[0] + (i + s->font_height) * s->frame->linesize[0], + avctx->width); + for (; i < avctx->height; i++) + memset(s->frame->data[0] + i * s->frame->linesize[0], + DEFAULT_BG_COLOR, avctx->width); +} + +static void erase_line(AVCodecContext * avctx, int xoffset, int xlength) +{ + AnsiContext *s = avctx->priv_data; + int i; + for (i = 0; i < s->font_height; i++) + memset(s->frame->data[0] + (s->y + i)*s->frame->linesize[0] + xoffset, + DEFAULT_BG_COLOR, xlength); +} + +static void erase_screen(AVCodecContext *avctx) +{ + AnsiContext *s = avctx->priv_data; + int i; + for (i = 0; i < avctx->height; i++) + memset(s->frame->data[0] + i * s->frame->linesize[0], DEFAULT_BG_COLOR, avctx->width); + s->x = s->y = 0; +} + +/** + * Draw character to screen + */ +static void draw_char(AVCodecContext *avctx, int c) +{ + AnsiContext *s = avctx->priv_data; + int fg = s->fg; + int bg = s->bg; + + if ((s->attributes & ATTR_BOLD)) + fg += 8; + if ((s->attributes & ATTR_BLINK)) + bg += 8; + if ((s->attributes & ATTR_REVERSE)) + FFSWAP(int, fg, bg); + if ((s->attributes & ATTR_CONCEALED)) + fg = bg; + ff_draw_pc_font(s->frame->data[0] + s->y * s->frame->linesize[0] + s->x, + s->frame->linesize[0], s->font, s->font_height, c, fg, bg); + s->x += FONT_WIDTH; + if (s->x >= avctx->width) { + s->x = 0; + hscroll(avctx); + } +} + +/** + * Execute ANSI escape code + * @return 0 on success, negative on error + */ +static int execute_code(AVCodecContext * avctx, int c) +{ + AnsiContext *s = avctx->priv_data; + int ret, i, width, height; + switch(c) { + case 'A': //Cursor Up + s->y = FFMAX(s->y - (s->nb_args > 0 ? s->args[0]*s->font_height : s->font_height), 0); + break; + case 'B': //Cursor Down + s->y = FFMIN(s->y + (s->nb_args > 0 ? s->args[0]*s->font_height : s->font_height), avctx->height - s->font_height); + break; + case 'C': //Cursor Right + s->x = FFMIN(s->x + (s->nb_args > 0 ? s->args[0]*FONT_WIDTH : FONT_WIDTH), avctx->width - FONT_WIDTH); + break; + case 'D': //Cursor Left + s->x = FFMAX(s->x - (s->nb_args > 0 ? s->args[0]*FONT_WIDTH : FONT_WIDTH), 0); + break; + case 'H': //Cursor Position + case 'f': //Horizontal and Vertical Position + s->y = s->nb_args > 0 ? av_clip((s->args[0] - 1)*s->font_height, 0, avctx->height - s->font_height) : 0; + s->x = s->nb_args > 1 ? av_clip((s->args[1] - 1)*FONT_WIDTH, 0, avctx->width - FONT_WIDTH) : 0; + break; + case 'h': //set creen mode + case 'l': //reset screen mode + if (s->nb_args < 2) + s->args[0] = DEFAULT_SCREEN_MODE; + width = avctx->width; + height = avctx->height; + switch(s->args[0]) { + case 0: case 1: case 4: case 5: case 13: case 19: //320x200 (25 rows) + s->font = avpriv_cga_font; + s->font_height = 8; + width = 40<<3; + height = 25<<3; + break; + case 2: case 3: //640x400 (25 rows) + s->font = avpriv_vga16_font; + s->font_height = 16; + width = 80<<3; + height = 25<<4; + break; + case 6: case 14: //640x200 (25 rows) + s->font = avpriv_cga_font; + s->font_height = 8; + width = 80<<3; + height = 25<<3; + break; + case 7: //set line wrapping + break; + case 15: case 16: //640x350 (43 rows) + s->font = avpriv_cga_font; + s->font_height = 8; + width = 80<<3; + height = 43<<3; + break; + case 17: case 18: //640x480 (60 rows) + s->font = avpriv_cga_font; + s->font_height = 8; + width = 80<<3; + height = 60<<4; + break; + default: + avpriv_request_sample(avctx, "Unsupported screen mode"); + } + if (width != avctx->width || height != avctx->height) { + av_frame_unref(s->frame); + avcodec_set_dimensions(avctx, width, height); + if ((ret = ff_get_buffer(avctx, s->frame, + AV_GET_BUFFER_FLAG_REF)) < 0) + return ret; + s->frame->pict_type = AV_PICTURE_TYPE_I; + s->frame->palette_has_changed = 1; + set_palette((uint32_t *)s->frame->data[1]); + erase_screen(avctx); + } else if (c == 'l') { + erase_screen(avctx); + } + break; + case 'J': //Erase in Page + switch (s->args[0]) { + case 0: + erase_line(avctx, s->x, avctx->width - s->x); + if (s->y < avctx->height - s->font_height) + memset(s->frame->data[0] + (s->y + s->font_height)*s->frame->linesize[0], + DEFAULT_BG_COLOR, (avctx->height - s->y - s->font_height)*s->frame->linesize[0]); + break; + case 1: + erase_line(avctx, 0, s->x); + if (s->y > 0) + memset(s->frame->data[0], DEFAULT_BG_COLOR, s->y * s->frame->linesize[0]); + break; + case 2: + erase_screen(avctx); + } + break; + case 'K': //Erase in Line + switch(s->args[0]) { + case 0: + erase_line(avctx, s->x, avctx->width - s->x); + break; + case 1: + erase_line(avctx, 0, s->x); + break; + case 2: + erase_line(avctx, 0, avctx->width); + } + break; + case 'm': //Select Graphics Rendition + if (s->nb_args == 0) { + s->nb_args = 1; + s->args[0] = 0; + } + for (i = 0; i < FFMIN(s->nb_args, MAX_NB_ARGS); i++) { + int m = s->args[i]; + if (m == 0) { + s->attributes = 0; + s->fg = DEFAULT_FG_COLOR; + s->bg = DEFAULT_BG_COLOR; + } else if (m == 1 || m == 2 || m == 4 || m == 5 || m == 7 || m == 8) { + s->attributes |= 1 << (m - 1); + } else if (m >= 30 && m <= 37) { + s->fg = ansi_to_cga[m - 30]; + } else if (m == 38 && i + 2 < FFMIN(s->nb_args, MAX_NB_ARGS) && s->args[i + 1] == 5 && s->args[i + 2] < 256) { + int index = s->args[i + 2]; + s->fg = index < 16 ? ansi_to_cga[index] : index; + i += 2; + } else if (m == 39) { + s->fg = ansi_to_cga[DEFAULT_FG_COLOR]; + } else if (m >= 40 && m <= 47) { + s->bg = ansi_to_cga[m - 40]; + } else if (m == 48 && i + 2 < FFMIN(s->nb_args, MAX_NB_ARGS) && s->args[i + 1] == 5 && s->args[i + 2] < 256) { + int index = s->args[i + 2]; + s->bg = index < 16 ? ansi_to_cga[index] : index; + i += 2; + } else if (m == 49) { + s->fg = ansi_to_cga[DEFAULT_BG_COLOR]; + } else { + avpriv_request_sample(avctx, "Unsupported rendition parameter"); + } + } + break; + case 'n': //Device Status Report + case 'R': //report current line and column + /* ignore */ + break; + case 's': //Save Cursor Position + s->sx = s->x; + s->sy = s->y; + break; + case 'u': //Restore Cursor Position + s->x = av_clip(s->sx, 0, avctx->width - FONT_WIDTH); + s->y = av_clip(s->sy, 0, avctx->height - s->font_height); + break; + default: + avpriv_request_sample(avctx, "Unknown escape code"); + break; + } + return 0; +} + +static int decode_frame(AVCodecContext *avctx, + void *data, int *got_frame, + AVPacket *avpkt) +{ + AnsiContext *s = avctx->priv_data; + uint8_t *buf = avpkt->data; + int buf_size = avpkt->size; + const uint8_t *buf_end = buf+buf_size; + int ret, i, count; + + if ((ret = ff_reget_buffer(avctx, s->frame)) < 0) + return ret; + if (!avctx->frame_number) { + for (i=0; iheight; i++) + memset(s->frame->data[0]+ i*s->frame->linesize[0], 0, avctx->width); + memset(s->frame->data[1], 0, AVPALETTE_SIZE); + } + + s->frame->pict_type = AV_PICTURE_TYPE_I; + s->frame->palette_has_changed = 1; + set_palette((uint32_t *)s->frame->data[1]); + if (!s->first_frame) { + erase_screen(avctx); + s->first_frame = 1; + } + + while(buf < buf_end) { + switch(s->state) { + case STATE_NORMAL: + switch (buf[0]) { + case 0x00: //NUL + case 0x07: //BEL + case 0x1A: //SUB + /* ignore */ + break; + case 0x08: //BS + s->x = FFMAX(s->x - 1, 0); + break; + case 0x09: //HT + i = s->x / FONT_WIDTH; + count = ((i + 8) & ~7) - i; + for (i = 0; i < count; i++) + draw_char(avctx, ' '); + break; + case 0x0A: //LF + hscroll(avctx); + case 0x0D: //CR + s->x = 0; + break; + case 0x0C: //FF + erase_screen(avctx); + break; + case 0x1B: //ESC + s->state = STATE_ESCAPE; + break; + default: + draw_char(avctx, buf[0]); + } + break; + case STATE_ESCAPE: + if (buf[0] == '[') { + s->state = STATE_CODE; + s->nb_args = 0; + s->args[0] = -1; + } else { + s->state = STATE_NORMAL; + draw_char(avctx, 0x1B); + continue; + } + break; + case STATE_CODE: + switch(buf[0]) { + case '0': case '1': case '2': case '3': case '4': + case '5': case '6': case '7': case '8': case '9': + if (s->nb_args < MAX_NB_ARGS) + s->args[s->nb_args] = FFMAX(s->args[s->nb_args], 0) * 10 + buf[0] - '0'; + break; + case ';': + s->nb_args++; + if (s->nb_args < MAX_NB_ARGS) + s->args[s->nb_args] = 0; + break; + case 'M': + s->state = STATE_MUSIC_PREAMBLE; + break; + case '=': case '?': + /* ignore */ + break; + default: + if (s->nb_args > MAX_NB_ARGS) + av_log(avctx, AV_LOG_WARNING, "args overflow (%i)\n", s->nb_args); + if (s->nb_args < MAX_NB_ARGS && s->args[s->nb_args] >= 0) + s->nb_args++; + if ((ret = execute_code(avctx, buf[0])) < 0) + return ret; + s->state = STATE_NORMAL; + } + break; + case STATE_MUSIC_PREAMBLE: + if (buf[0] == 0x0E || buf[0] == 0x1B) + s->state = STATE_NORMAL; + /* ignore music data */ + break; + } + buf++; + } + + *got_frame = 1; + if ((ret = av_frame_ref(data, s->frame)) < 0) + return ret; + return buf_size; +} + +static av_cold int decode_close(AVCodecContext *avctx) +{ + AnsiContext *s = avctx->priv_data; + + av_frame_free(&s->frame); + return 0; +} + +AVCodec ff_ansi_decoder = { + .name = "ansi", + .type = AVMEDIA_TYPE_VIDEO, + .id = AV_CODEC_ID_ANSI, + .priv_data_size = sizeof(AnsiContext), + .init = decode_init, + .close = decode_close, + .decode = decode_frame, + .capabilities = CODEC_CAP_DR1, + .long_name = NULL_IF_CONFIG_SMALL("ASCII/ANSI art"), +}; -- cgit v1.2.3