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ffmpeg/libavcodec/ansi.c
Michael Niedermayer 976a8b2179 Merge remote-tracking branch 'qatar/master' 
* qatar/master: (40 commits)
  H.264: template left MB handling
  H.264: faster fill_decode_caches
  H.264: faster write_back_*
  H.264: faster fill_filter_caches
  H.264: make filter_mb_fast support the case of unavailable top mb
  Do not include log.h in avutil.h
  Do not include pixfmt.h in avutil.h
  Do not include rational.h in avutil.h
  Do not include mathematics.h in avutil.h
  Do not include intfloat_readwrite.h in avutil.h
  Remove return statements following infinite loops without break
  RTSP: Doxygen comment cleanup
  doxygen: Escape '\' in Doxygen documentation.
  md5: cosmetics
  md5: use AV_WL32 to write result
  md5: add fate test
  md5: include correct headers
  md5: fix test program
  doxygen: Drop array size declarations from Doxygen parameter names.
  doxygen: Fix parameter names to match the function prototypes.
  ...

Conflicts:
	libavcodec/x86/dsputil_mmx.c
	libavformat/flvenc.c
	libavformat/oggenc.c
	libavformat/wtv.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
2011-07-04 00:45:21 +02:00

437 lines
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/*
* 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 "libavutil/lfg.h"
#include "avcodec.h"
#include "cga_data.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 */
/* 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;
avcodec_get_frame_defaults(&s->frame);
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
* @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;
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 = AV_PICTURE_TYPE_I;
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 = AV_PICTURE_TYPE_I;
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 ff_ansi_decoder = {
.name = "ansi",
.type = AVMEDIA_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"),
};
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