FFmpeg coverage

GCC Code Coverage Report

Directory:	../../../ffmpeg/		Exec	Total	Coverage
File:	src/libavcodec/ansi.c	Lines:	169	312	54.2 %
Date:	2021-01-21 21:11:50	Branches:	106	206	51.5 %


/*
 * 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/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_ITALICS      0x04  /**< Italics (mode 3) */
#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 AnsiContext {
    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;

    /* 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) {
        int ret = ff_set_dimensions(avctx, 80 << 3, 25 << 4);
        if (ret < 0)
            return ret;
    } else if (avctx->width % FONT_WIDTH || avctx->height % s->font_height) {
        av_log(avctx, AV_LOG_ERROR, "Invalid dimensions %d %d\n", avctx->width, avctx->height);
        return AVERROR(EINVAL);
    }

    s->frame = av_frame_alloc();
    if (!s->frame)
        return AVERROR(ENOMEM);

    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 - 2*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 - FONT_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;
    int width  = avctx->width;
    int height = avctx->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 screen 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 = 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");
        }
        s->x = av_clip(s->x, 0, width  - FONT_WIDTH);
        s->y = av_clip(s->y, 0, height - s->font_height);
        if (width != avctx->width || height != avctx->height) {
            av_frame_unref(s->frame);
            ret = ff_set_dimensions(avctx, width, height);
            if (ret < 0)
                return ret;
            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 == 3 || 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;
    }
    s->x = av_clip(s->x, 0, avctx->width  - FONT_WIDTH);
    s->y = av_clip(s->y, 0, avctx->height - s->font_height);
    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)) < 0)
        return ret;
    if (!avctx->frame_number) {
        for (i=0; i<avctx->height; 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] < 6553)
                    s->args[s->nb_args] = FFMAX(s->args[s->nb_args], 0) * 10 + buf[0] - '0';
                break;
            case ';':
                if (s->nb_args < MAX_NB_ARGS)
                    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;
}

static const AVCodecDefault ansi_defaults[] = {
    { "max_pixels", "640*480" },
    { NULL },
};

AVCodec ff_ansi_decoder = {
    .name           = "ansi",
    .long_name      = NULL_IF_CONFIG_SMALL("ASCII/ANSI art"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_ANSI,
    .priv_data_size = sizeof(AnsiContext),
    .init           = decode_init,
    .close          = decode_close,
    .decode         = decode_frame,
    .capabilities   = AV_CODEC_CAP_DR1,
    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
    .defaults       = ansi_defaults,
};


Generated by: GCOVR (Version 4.2)

Line	Branch	Exec	Source
1			/*
2			* ASCII/ANSI art decoder
3			* Copyright (c) 2010 Peter Ross <pross@xvid.org>
4			*
5			* This file is part of FFmpeg.
6			*
7			* FFmpeg is free software; you can redistribute it and/or
8			* modify it under the terms of the GNU Lesser General Public
9			* License as published by the Free Software Foundation; either
10			* version 2.1 of the License, or (at your option) any later version.
11			*
12			* FFmpeg is distributed in the hope that it will be useful,
13			* but WITHOUT ANY WARRANTY; without even the implied warranty of
14			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15			* Lesser General Public License for more details.
16			*
17			* You should have received a copy of the GNU Lesser General Public
18			* License along with FFmpeg; if not, write to the Free Software
19			* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20			*/
21
22			/**
23			* @file
24			* ASCII/ANSI art decoder
25			*/
26
27			#include "libavutil/common.h"
28			#include "libavutil/frame.h"
29			#include "libavutil/lfg.h"
30			#include "libavutil/xga_font_data.h"
31			#include "avcodec.h"
32			#include "cga_data.h"
33			#include "internal.h"
34
35			#define ATTR_BOLD 0x01 /*< Bold/Bright-foreground (mode 1) /
36			#define ATTR_FAINT 0x02 /*< Faint (mode 2) /
37			#define ATTR_ITALICS 0x04 /*< Italics (mode 3) /
38			#define ATTR_UNDERLINE 0x08 /*< Underline (mode 4) /
39			#define ATTR_BLINK 0x10 /*< Blink/Bright-background (mode 5) /
40			#define ATTR_REVERSE 0x40 /*< Reverse (mode 7) /
41			#define ATTR_CONCEALED 0x80 /*< Concealed (mode 8) /
42
43			#define DEFAULT_FG_COLOR 7 /*< CGA color index /
44			#define DEFAULT_BG_COLOR 0
45			#define DEFAULT_SCREEN_MODE 3 /*< 80x25 /
46
47			#define FONT_WIDTH 8 /*< Font width /
48
49			/** map ansi color index to cga palette index */
50			static const uint8_t ansi_to_cga[16] = {
51			0, 4, 2, 6, 1, 5, 3, 7, 8, 12, 10, 14, 9, 13, 11, 15
52			};
53
54			typedef struct AnsiContext {
55			AVFrame *frame;
56			int x; /*< x cursor position (pixels) /
57			int y; /*< y cursor position (pixels) /
58			int sx; /*< saved x cursor position (pixels) /
59			int sy; /*< saved y cursor position (pixels) /
60			const uint8_t* font; /*< font /
61			int font_height; /*< font height /
62			int attributes; /*< attribute flags /
63			int fg; /*< foreground color /
64			int bg; /*< background color /
65			int first_frame;
66
67			/* ansi parser state machine */
68			enum {
69			STATE_NORMAL = 0,
70			STATE_ESCAPE,
71			STATE_CODE,
72			STATE_MUSIC_PREAMBLE
73			} state;
74			#define MAX_NB_ARGS 4
75			int args[MAX_NB_ARGS];
76			int nb_args; /*< number of arguments (may exceed MAX_NB_ARGS) /
77			} AnsiContext;
78
79		4	static av_cold int decode_init(AVCodecContext *avctx)
80			{
81		4	AnsiContext *s = avctx->priv_data;
82		4	avctx->pix_fmt = AV_PIX_FMT_PAL8;
83
84			/* defaults */
85		4	s->font = avpriv_vga16_font;
86		4	s->font_height = 16;
87		4	s->fg = DEFAULT_FG_COLOR;
88		4	s->bg = DEFAULT_BG_COLOR;
89
90	✓✓✗✓	6	if (!avctx->width \|\| !avctx->height) {
91		2	int ret = ff_set_dimensions(avctx, 80 << 3, 25 << 4);
92	✗✓	2	if (ret < 0)
93			return ret;
94	✓✗✗✓	2	} else if (avctx->width % FONT_WIDTH \|\| avctx->height % s->font_height) {
95			av_log(avctx, AV_LOG_ERROR, "Invalid dimensions %d %d\n", avctx->width, avctx->height);
96			return AVERROR(EINVAL);
97			}
98
99		4	s->frame = av_frame_alloc();
100	✗✓	4	if (!s->frame)
101			return AVERROR(ENOMEM);
102
103		4	return 0;
104			}
105
106		25	static void set_palette(uint32_t *pal)
107			{
108			int r, g, b;
109		25	memcpy(pal, ff_cga_palette, 16 * 4);
110		25	pal += 16;
111			#define COLOR(x) ((x) * 40 + 55)
112	✓✓	175	for (r = 0; r < 6; r++)
113	✓✓	1050	for (g = 0; g < 6; g++)
114	✓✓	6300	for (b = 0; b < 6; b++)
115		5400	*pal++ = 0xFF000000 \| (COLOR(r) << 16) \| (COLOR(g) << 8) \| COLOR(b);
116			#define GRAY(x) ((x) * 10 + 8)
117	✓✓	625	for (g = 0; g < 24; g++)
118		600	*pal++ = 0xFF000000 \| (GRAY(g) << 16) \| (GRAY(g) << 8) \| GRAY(g);
119		25	}
120
121		630	static void hscroll(AVCodecContext *avctx)
122			{
123		630	AnsiContext *s = avctx->priv_data;
124			int i;
125
126	✓✓	630	if (s->y <= avctx->height - 2*s->font_height) {
127		483	s->y += s->font_height;
128		483	return;
129			}
130
131		147	i = 0;
132	✓✓	56595	for (; i < avctx->height - s->font_height; i++)
133		56448	memcpy(s->frame->data[0] + i * s->frame->linesize[0],
134		56448	s->frame->data[0] + (i + s->font_height) * s->frame->linesize[0],
135		56448	avctx->width);
136	✓✓	2499	for (; i < avctx->height; i++)
137		2352	memset(s->frame->data[0] + i * s->frame->linesize[0],
138		2352	DEFAULT_BG_COLOR, avctx->width);
139			}
140
141			static void erase_line(AVCodecContext * avctx, int xoffset, int xlength)
142			{
143			AnsiContext *s = avctx->priv_data;
144			int i;
145			for (i = 0; i < s->font_height; i++)
146			memset(s->frame->data[0] + (s->y + i)*s->frame->linesize[0] + xoffset,
147			DEFAULT_BG_COLOR, xlength);
148			}
149
150		2	static void erase_screen(AVCodecContext *avctx)
151			{
152		2	AnsiContext *s = avctx->priv_data;
153			int i;
154	✓✓	802	for (i = 0; i < avctx->height; i++)
155		800	memset(s->frame->data[0] + i * s->frame->linesize[0], DEFAULT_BG_COLOR, avctx->width);
156		2	s->x = s->y = 0;
157		2	}
158
159			/**
160			* Draw character to screen
161			*/
162		12126	static void draw_char(AVCodecContext *avctx, int c)
163			{
164		12126	AnsiContext *s = avctx->priv_data;
165		12126	int fg = s->fg;
166		12126	int bg = s->bg;
167
168	✓✓	12126	if ((s->attributes & ATTR_BOLD))
169		3026	fg += 8;
170	✗✓	12126	if ((s->attributes & ATTR_BLINK))
171			bg += 8;
172	✗✓	12126	if ((s->attributes & ATTR_REVERSE))
173			FFSWAP(int, fg, bg);
174	✗✓	12126	if ((s->attributes & ATTR_CONCEALED))
175			fg = bg;
176		12126	ff_draw_pc_font(s->frame->data[0] + s->y * s->frame->linesize[0] + s->x,
177		12126	s->frame->linesize[0], s->font, s->font_height, c, fg, bg);
178		12126	s->x += FONT_WIDTH;
179	✓✓	12126	if (s->x > avctx->width - FONT_WIDTH) {
180		145	s->x = 0;
181		145	hscroll(avctx);
182			}
183		12126	}
184
185			/**
186			* Execute ANSI escape code
187			* @return 0 on success, negative on error
188			*/
189		4624	static int execute_code(AVCodecContext * avctx, int c)
190			{
191		4624	AnsiContext *s = avctx->priv_data;
192			int ret, i;
193		4624	int width = avctx->width;
194		4624	int height = avctx->height;
195
196	✓✗✓✗ ✗✗✗✗ ✓✗✗✗ ✗	4624	switch(c) {
197		435	case 'A': //Cursor Up
198	✗✓	435	s->y = FFMAX(s->y - (s->nb_args > 0 ? s->args[0]*s->font_height : s->font_height), 0);
199		435	break;
200			case 'B': //Cursor Down
201			s->y = FFMIN(s->y + (s->nb_args > 0 ? s->args[0]*s->font_height : s->font_height), avctx->height - s->font_height);
202			break;
203		473	case 'C': //Cursor Right
204	✓✓✗✓ ✓✓	473	s->x = FFMIN(s->x + (s->nb_args > 0 ? s->args[0]*FONT_WIDTH : FONT_WIDTH), avctx->width - FONT_WIDTH);
205		473	break;
206			case 'D': //Cursor Left
207			s->x = FFMAX(s->x - (s->nb_args > 0 ? s->args[0]*FONT_WIDTH : FONT_WIDTH), 0);
208			break;
209			case 'H': //Cursor Position
210			case 'f': //Horizontal and Vertical Position
211			s->y = s->nb_args > 0 ? av_clip((s->args[0] - 1)*s->font_height, 0, avctx->height - s->font_height) : 0;
212			s->x = s->nb_args > 1 ? av_clip((s->args[1] - 1)*FONT_WIDTH, 0, avctx->width - FONT_WIDTH) : 0;
213			break;
214			case 'h': //set screen mode
215			case 'l': //reset screen mode
216			if (s->nb_args < 2)
217			s->args[0] = DEFAULT_SCREEN_MODE;
218			switch(s->args[0]) {
219			case 0: case 1: case 4: case 5: case 13: case 19: //320x200 (25 rows)
220			s->font = avpriv_cga_font;
221			s->font_height = 8;
222			width = 40<<3;
223			height = 25<<3;
224			break;
225			case 2: case 3: //640x400 (25 rows)
226			s->font = avpriv_vga16_font;
227			s->font_height = 16;
228			width = 80<<3;
229			height = 25<<4;
230			break;
231			case 6: case 14: //640x200 (25 rows)
232			s->font = avpriv_cga_font;
233			s->font_height = 8;
234			width = 80<<3;
235			height = 25<<3;
236			break;
237			case 7: //set line wrapping
238			break;
239			case 15: case 16: //640x350 (43 rows)
240			s->font = avpriv_cga_font;
241			s->font_height = 8;
242			width = 80<<3;
243			height = 43<<3;
244			break;
245			case 17: case 18: //640x480 (60 rows)
246			s->font = avpriv_cga_font;
247			s->font_height = 8;
248			width = 80<<3;
249			height = 60<<4;
250			break;
251			default:
252			avpriv_request_sample(avctx, "Unsupported screen mode");
253			}
254			s->x = av_clip(s->x, 0, width - FONT_WIDTH);
255			s->y = av_clip(s->y, 0, height - s->font_height);
256			if (width != avctx->width \|\| height != avctx->height) {
257			av_frame_unref(s->frame);
258			ret = ff_set_dimensions(avctx, width, height);
259			if (ret < 0)
260			return ret;
261			if ((ret = ff_get_buffer(avctx, s->frame,
262			AV_GET_BUFFER_FLAG_REF)) < 0)
263			return ret;
264			s->frame->pict_type = AV_PICTURE_TYPE_I;
265			s->frame->palette_has_changed = 1;
266			set_palette((uint32_t *)s->frame->data[1]);
267			erase_screen(avctx);
268			} else if (c == 'l') {
269			erase_screen(avctx);
270			}
271			break;
272			case 'J': //Erase in Page
273			switch (s->args[0]) {
274			case 0:
275			erase_line(avctx, s->x, avctx->width - s->x);
276			if (s->y < avctx->height - s->font_height)
277			memset(s->frame->data[0] + (s->y + s->font_height)*s->frame->linesize[0],
278			DEFAULT_BG_COLOR, (avctx->height - s->y - s->font_height)*s->frame->linesize[0]);
279			break;
280			case 1:
281			erase_line(avctx, 0, s->x);
282			if (s->y > 0)
283			memset(s->frame->data[0], DEFAULT_BG_COLOR, s->y * s->frame->linesize[0]);
284			break;
285			case 2:
286			erase_screen(avctx);
287			}
288			break;
289			case 'K': //Erase in Line
290			switch(s->args[0]) {
291			case 0:
292			erase_line(avctx, s->x, avctx->width - s->x);
293			break;
294			case 1:
295			erase_line(avctx, 0, s->x);
296			break;
297			case 2:
298			erase_line(avctx, 0, avctx->width);
299			}
300			break;
301		3716	case 'm': //Select Graphics Rendition
302	✗✓	3716	if (s->nb_args == 0) {
303			s->nb_args = 1;
304			s->args[0] = 0;
305			}
306	✓✓	8955	for (i = 0; i < FFMIN(s->nb_args, MAX_NB_ARGS); i++) {
307		5239	int m = s->args[i];
308	✓✓	5239	if (m == 0) {
309		479	s->attributes = 0;
310		479	s->fg = DEFAULT_FG_COLOR;
311		479	s->bg = DEFAULT_BG_COLOR;
312	✓✓✓✗ ✓✗✓✗ ✓✗✓✗ ✗✓	4760	} else if (m == 1 \|\| m == 2 \|\| m == 3 \|\| m == 4 \|\| m == 5 \|\| m == 7 \|\| m == 8) {
313		477	s->attributes \|= 1 << (m - 1);
314	✓✗✓✓	4283	} else if (m >= 30 && m <= 37) {
315		1651	s->fg = ansi_to_cga[m - 30];
316	✓✓✓✗ ✓✗✓✗	2632	} else if (m == 38 && i + 2 < FFMIN(s->nb_args, MAX_NB_ARGS) && s->args[i + 1] == 5 && s->args[i + 2] < 256) {
317		512	int index = s->args[i + 2];
318	✓✓	512	s->fg = index < 16 ? ansi_to_cga[index] : index;
319		512	i += 2;
320	✗✓	2120	} else if (m == 39) {
321			s->fg = ansi_to_cga[DEFAULT_FG_COLOR];
322	✓✗✓✓	2120	} else if (m >= 40 && m <= 47) {
323		1608	s->bg = ansi_to_cga[m - 40];
324	✓✗✓✗ ✓✗✓✗	512	} else if (m == 48 && i + 2 < FFMIN(s->nb_args, MAX_NB_ARGS) && s->args[i + 1] == 5 && s->args[i + 2] < 256) {
325		512	int index = s->args[i + 2];
326	✓✓	512	s->bg = index < 16 ? ansi_to_cga[index] : index;
327		512	i += 2;
328			} else if (m == 49) {
329			s->fg = ansi_to_cga[DEFAULT_BG_COLOR];
330			} else {
331			avpriv_request_sample(avctx, "Unsupported rendition parameter");
332			}
333			}
334		3716	break;
335			case 'n': //Device Status Report
336			case 'R': //report current line and column
337			/* ignore */
338			break;
339			case 's': //Save Cursor Position
340			s->sx = s->x;
341			s->sy = s->y;
342			break;
343			case 'u': //Restore Cursor Position
344			s->x = av_clip(s->sx, 0, avctx->width - FONT_WIDTH);
345			s->y = av_clip(s->sy, 0, avctx->height - s->font_height);
346			break;
347			default:
348			avpriv_request_sample(avctx, "Unknown escape code");
349			break;
350			}
351		4624	s->x = av_clip(s->x, 0, avctx->width - FONT_WIDTH);
352		4624	s->y = av_clip(s->y, 0, avctx->height - s->font_height);
353		4624	return 0;
354			}
355
356		25	static int decode_frame(AVCodecContext *avctx,
357			void data, int got_frame,
358			AVPacket *avpkt)
359			{
360		25	AnsiContext *s = avctx->priv_data;
361		25	uint8_t *buf = avpkt->data;
362		25	int buf_size = avpkt->size;
363		25	const uint8_t *buf_end = buf+buf_size;
364			int ret, i, count;
365
366	✗✓	25	if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
367			return ret;
368	✓✓	25	if (!avctx->frame_number) {
369	✓✓	802	for (i=0; i<avctx->height; i++)
370		800	memset(s->frame->data[0]+ i*s->frame->linesize[0], 0, avctx->width);
371		2	memset(s->frame->data[1], 0, AVPALETTE_SIZE);
372			}
373
374		25	s->frame->pict_type = AV_PICTURE_TYPE_I;
375		25	s->frame->palette_has_changed = 1;
376		25	set_palette((uint32_t *)s->frame->data[1]);
377	✓✓	25	if (!s->first_frame) {
378		2	erase_screen(avctx);
379		2	s->first_frame = 1;
380			}
381
382	✓✓	42502	while(buf < buf_end) {
383	✓✓✓✗ ✗	42477	switch(s->state) {
384		16136	case STATE_NORMAL:
385	✓✗✓✓ ✓✗✓✓	16136	switch (buf[0]) {
386		1	case 0x00: //NUL
387			case 0x07: //BEL
388			case 0x1A: //SUB
389			/* ignore */
390		1	break;
391			case 0x08: //BS
392			s->x = FFMAX(s->x - 1, 0);
393			break;
394		256	case 0x09: //HT
395		256	i = s->x / FONT_WIDTH;
396		256	count = ((i + 8) & ~7) - i;
397	✓✓	2048	for (i = 0; i < count; i++)
398		1792	draw_char(avctx, ' ');
399		256	break;
400		485	case 0x0A: //LF
401		485	hscroll(avctx);
402		921	case 0x0D: //CR
403		921	s->x = 0;
404		921	break;
405			case 0x0C: //FF
406			erase_screen(avctx);
407			break;
408		4624	case 0x1B: //ESC
409		4624	s->state = STATE_ESCAPE;
410		4624	break;
411		10334	default:
412		10334	draw_char(avctx, buf[0]);
413			}
414		16136	break;
415		4624	case STATE_ESCAPE:
416	✓✗	4624	if (buf[0] == '[') {
417		4624	s->state = STATE_CODE;
418		4624	s->nb_args = 0;
419		4624	s->args[0] = -1;
420			} else {
421			s->state = STATE_NORMAL;
422			draw_char(avctx, 0x1B);
423			continue;
424			}
425		4624	break;
426		21717	case STATE_CODE:
427	✓✓✗✗ ✓	21717	switch(buf[0]) {
428		13522	case '0': case '1': case '2': case '3': case '4':
429			case '5': case '6': case '7': case '8': case '9':
430	✓✗✓✗	13522	if (s->nb_args < MAX_NB_ARGS && s->args[s->nb_args] < 6553)
431		13522	s->args[s->nb_args] = FFMAX(s->args[s->nb_args], 0) * 10 + buf[0] - '0';
432		13522	break;
433		3571	case ';':
434	✓✗	3571	if (s->nb_args < MAX_NB_ARGS)
435		3571	s->nb_args++;
436	✓✗	3571	if (s->nb_args < MAX_NB_ARGS)
437		3571	s->args[s->nb_args] = 0;
438		3571	break;
439			case 'M':
440			s->state = STATE_MUSIC_PREAMBLE;
441			break;
442			case '=': case '?':
443			/* ignore */
444			break;
445		4624	default:
446	✗✓	4624	if (s->nb_args > MAX_NB_ARGS)
447			av_log(avctx, AV_LOG_WARNING, "args overflow (%i)\n", s->nb_args);
448	✓✗✓✓	4624	if (s->nb_args < MAX_NB_ARGS && s->args[s->nb_args] >= 0)
449		4188	s->nb_args++;
450	✗✓	4624	if ((ret = execute_code(avctx, buf[0])) < 0)
451			return ret;
452		4624	s->state = STATE_NORMAL;
453			}
454		21717	break;
455			case STATE_MUSIC_PREAMBLE:
456			if (buf[0] == 0x0E \|\| buf[0] == 0x1B)
457			s->state = STATE_NORMAL;
458			/* ignore music data */
459			break;
460			}
461		42477	buf++;
462			}
463
464		25	*got_frame = 1;
465	✗✓	25	if ((ret = av_frame_ref(data, s->frame)) < 0)
466			return ret;
467		25	return buf_size;
468			}
469
470		4	static av_cold int decode_close(AVCodecContext *avctx)
471			{
472		4	AnsiContext *s = avctx->priv_data;
473
474		4	av_frame_free(&s->frame);
475		4	return 0;
476			}
477
478			static const AVCodecDefault ansi_defaults[] = {
479			{ "max_pixels", "640*480" },
480			{ NULL },
481			};
482
483			AVCodec ff_ansi_decoder = {
484			.name = "ansi",
485			.long_name = NULL_IF_CONFIG_SMALL("ASCII/ANSI art"),
486			.type = AVMEDIA_TYPE_VIDEO,
487			.id = AV_CODEC_ID_ANSI,
488			.priv_data_size = sizeof(AnsiContext),
489			.init = decode_init,
490			.close = decode_close,
491			.decode = decode_frame,
492			.capabilities = AV_CODEC_CAP_DR1,
493			.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
494			.defaults = ansi_defaults,
495			};