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ASCII/ANSI art decoder 

Originally committed as revision 24299 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Peter Ross 2010-07-18 08:03:35 +00:00
parent 7199c3a4e2
commit beaa963cab
4 changed files with 436 additions and 1 deletions
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1
libavcodec/Makefile
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@ -60,6 +60,7 @@ OBJS-$(CONFIG_AMRNB_DECODER) += amrnbdec.o celp_filters.o \
acelp_pitch_delay.o
OBJS-$(CONFIG_AMV_DECODER) += sp5xdec.o mjpegdec.o mjpeg.o
OBJS-$(CONFIG_ANM_DECODER) += anm.o
OBJS-$(CONFIG_ANSI_DECODER) += ansi.o cga_data.o
OBJS-$(CONFIG_APE_DECODER) += apedec.o
OBJS-$(CONFIG_ASV1_DECODER) += asv1.o mpeg12data.o
OBJS-$(CONFIG_ASV1_ENCODER) += asv1.o mpeg12data.o

1
libavcodec/allcodecs.c
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@ -69,6 +69,7 @@ void avcodec_register_all(void)
REGISTER_DECODER (AASC, aasc);
REGISTER_DECODER (AMV, amv);
REGISTER_DECODER (ANM, anm);
REGISTER_DECODER (ANSI, ansi);
REGISTER_ENCDEC (ASV1, asv1);
REGISTER_ENCDEC (ASV2, asv2);
REGISTER_DECODER (AURA, aura);

432
libavcodec/ansi.c Normal file
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@ -0,0 +1,432 @@
/*
* ASCII/ANSI art decoder
* Copyright (c) 2010 Peter Ross <pross@xvid.org>
*
* 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 "avcodec.h"
#include "cga_data.h"
#include <libavutil/lfg.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, y; /** cursor position (pixels) */
int sx, sy; /** saved cursor position (pixels) */
const uint8_t* font; /** font */
int font_height; /** font height */
int attributes; /** attribute flags */
int fg, bg; /** foreground and background color */
/* 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 = PIX_FMT_PAL8;
/* defaults */
s->font = ff_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 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
* @param <0 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;
switch(s->args[0]) {
case 0: case 1: case 4: case 5: case 13: case 19: //320x200 (25 rows)
s->font = ff_cga_font;
s->font_height = 8;
width = 40<<3;
height = 25<<3;
break;
case 2: case 3: //640x400 (25 rows)
s->font = ff_vga16_font;
s->font_height = 16;
width = 80<<3;
height = 25<<4;
break;
case 6: case 14: //640x200 (25 rows)
s->font = ff_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 = ff_cga_font;
s->font_height = 8;
width = 80<<3;
height = 43<<3;
break;
case 17: case 18: //640x480 (60 rows)
s->font = ff_cga_font;
s->font_height = 8;
width = 80<<3;
height = 60<<4;
break;
default:
av_log_ask_for_sample(avctx, "unsupported screen mode\n");
}
if (width != avctx->width || height != avctx->height) {
if (s->frame.data[0])
avctx->release_buffer(avctx, &s->frame);
avcodec_set_dimensions(avctx, width, height);
ret = avctx->get_buffer(avctx, &s->frame);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return ret;
}
s->frame.pict_type = FF_I_TYPE;
s->frame.palette_has_changed = 1;
memcpy(s->frame.data[1], ff_cga_palette, 16 * 4);
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 <= 38) {
s->fg = ansi_to_cga[m - 30];
} 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 == 49) {
s->fg = ansi_to_cga[DEFAULT_BG_COLOR];
} else {
av_log_ask_for_sample(avctx, "unsupported rendition parameter\n");
}
}
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:
av_log_ask_for_sample(avctx, "unsupported escape code\n");
break;
}
return 0;
}
static int decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
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;
ret = avctx->reget_buffer(avctx, &s->frame);
if (ret < 0){
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return ret;
}
s->frame.pict_type = FF_I_TYPE;
s->frame.palette_has_changed = 1;
memcpy(s->frame.data[1], ff_cga_palette, 16 * 4);
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] = 0;
} else {
s->state = STATE_NORMAL;
draw_char(avctx, 0x1B);
return -1;
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] = s->args[s->nb_args] * 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])
s->nb_args++;
if (execute_code(avctx, buf[0]) < 0)
return -1;
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++;
}
*data_size = sizeof(AVFrame);
*(AVFrame*)data = s->frame;
return buf_size;
}
static av_cold int decode_close(AVCodecContext *avctx)
{
AnsiContext *s = avctx->priv_data;
if (s->frame.data[0])
avctx->release_buffer(avctx, &s->frame);
return 0;
}
AVCodec ansi_decoder = {
.name = "ansi",
.type = CODEC_TYPE_VIDEO,
.id = 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"),
};

3
libavcodec/avcodec.h
View File

@ -30,7 +30,7 @@
#include "libavutil/avutil.h"
#define LIBAVCODEC_VERSION_MAJOR 52
#define LIBAVCODEC_VERSION_MINOR 83
#define LIBAVCODEC_VERSION_MINOR 84
#define LIBAVCODEC_VERSION_MICRO 0
#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
@ -212,6 +212,7 @@ enum CodecID {
CODEC_ID_YOP,
CODEC_ID_VP8,
CODEC_ID_PICTOR,
CODEC_ID_ANSI,
/* various PCM "codecs" */
CODEC_ID_PCM_S16LE= 0x10000,