mpv/video/out/vo_tct.c

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/*
* This file is part of mpv.
*
* mpv 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.
*
* mpv 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 mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <unistd.h>
#include <config.h>
#if HAVE_POSIX
#include <sys/ioctl.h>
#endif
#include <libswscale/swscale.h>
#include "options/m_config.h"
#include "config.h"
#include "vo.h"
#include "sub/osd.h"
#include "video/sws_utils.h"
#include "video/mp_image.h"
#define IMGFMT IMGFMT_BGR24
#define ALGO_PLAIN 1
#define ALGO_HALF_BLOCKS 2
#define ESC_HIDE_CURSOR "\e[?25l"
#define ESC_RESTORE_CURSOR "\e[?25h"
#define ESC_CLEAR_SCREEN "\e[2J"
#define ESC_CLEAR_COLORS "\e[0m"
#define ESC_GOTOXY "\e[%d;%df"
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#define ESC_COLOR_BG "\e[48;2;%d;%d;%dm"
#define ESC_COLOR_FG "\e[38;2;%d;%d;%dm"
#define ESC_COLOR256_BG "\e[48;5;%dm"
#define ESC_COLOR256_FG "\e[38;5;%dm"
#define DEFAULT_WIDTH 80
#define DEFAULT_HEIGHT 25
struct vo_tct_opts {
int algo;
int width; // 0 -> default
int height; // 0 -> default
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int term256; // 0 -> true color
};
#define OPT_BASE_STRUCT struct vo_tct_opts
static const struct m_sub_options vo_tct_conf = {
.opts = (const m_option_t[]) {
OPT_CHOICE("vo-tct-algo", algo, 0,
({"plain", ALGO_PLAIN},
{"half-blocks", ALGO_HALF_BLOCKS})),
OPT_INT("vo-tct-width", width, 0),
OPT_INT("vo-tct-height", height, 0),
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OPT_FLAG("vo-tct-256", term256, 0),
{0}
},
.defaults = &(const struct vo_tct_opts) {
.algo = ALGO_HALF_BLOCKS,
},
.size = sizeof(struct vo_tct_opts),
};
struct priv {
struct vo_tct_opts *opts;
size_t buffer_size;
char *buffer;
int swidth;
int sheight;
struct mp_image *frame;
struct mp_rect src;
struct mp_rect dst;
struct mp_sws_context *sws;
};
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// Convert RGB24 to xterm-256 8-bit value
// For simplicity, assume RGB space is perceptually uniform.
// There are 5 places where one of two outputs needs to be chosen when the
// input is the exact middle:
// - The r/g/b channels and the gray value: the higher value output is chosen.
// - If the gray and color have same distance from the input - color is chosen.
static int rgb_to_x256(uint8_t r, uint8_t g, uint8_t b)
{
// Calculate the nearest 0-based color index at 16 .. 231
# define v2ci(v) (v < 48 ? 0 : v < 115 ? 1 : (v - 35) / 40)
int ir = v2ci(r), ig = v2ci(g), ib = v2ci(b); // 0..5 each
# define color_index() (36 * ir + 6 * ig + ib) /* 0..215, lazy evaluation */
// Calculate the nearest 0-based gray index at 232 .. 255
int average = (r + g + b) / 3;
int gray_index = average > 238 ? 23 : (average - 3) / 10; // 0..23
// Calculate the represented colors back from the index
static const int i2cv[6] = {0, 0x5f, 0x87, 0xaf, 0xd7, 0xff};
int cr = i2cv[ir], cg = i2cv[ig], cb = i2cv[ib]; // r/g/b, 0..255 each
int gv = 8 + 10 * gray_index; // same value for r/g/b, 0..255
// Return the one which is nearer to the original input rgb value
# define dist_square(A,B,C, a,b,c) ((A-a)*(A-a) + (B-b)*(B-b) + (C-c)*(C-c))
int color_err = dist_square(cr, cg, cb, r, g, b);
int gray_err = dist_square(gv, gv, gv, r, g, b);
return color_err <= gray_err ? 16 + color_index() : 232 + gray_index;
}
static void write_plain(
const int dwidth, const int dheight,
const int swidth, const int sheight,
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const unsigned char *source, const int source_stride,
bool term256)
{
assert(source);
const int tx = (dwidth - swidth) / 2;
const int ty = (dheight - sheight) / 2;
for (int y = 0; y < sheight; y++) {
const unsigned char *row = source + y * source_stride;
printf(ESC_GOTOXY, ty + y, tx);
for (int x = 0; x < swidth; x++) {
unsigned char b = *row++;
unsigned char g = *row++;
unsigned char r = *row++;
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if (term256) {
printf(ESC_COLOR256_BG, rgb_to_x256(r, g, b));
} else {
printf(ESC_COLOR_BG, r, g, b);
}
printf(" ");
}
printf(ESC_CLEAR_COLORS);
}
printf("\n");
}
static void write_half_blocks(
const int dwidth, const int dheight,
const int swidth, const int sheight,
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unsigned char *source, int source_stride,
bool term256)
{
assert(source);
const int tx = (dwidth - swidth) / 2;
const int ty = (dheight - sheight) / 2;
for (int y = 0; y < sheight * 2; y += 2) {
const unsigned char *row_up = source + y * source_stride;
const unsigned char *row_down = source + (y + 1) * source_stride;
printf(ESC_GOTOXY, ty + y / 2, tx);
for (int x = 0; x < swidth; x++) {
unsigned char b_up = *row_up++;
unsigned char g_up = *row_up++;
unsigned char r_up = *row_up++;
unsigned char b_down = *row_down++;
unsigned char g_down = *row_down++;
unsigned char r_down = *row_down++;
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if (term256) {
printf(ESC_COLOR256_BG, rgb_to_x256(r_up, g_up, b_up));
printf(ESC_COLOR256_FG, rgb_to_x256(r_down, g_down, b_down));
} else {
printf(ESC_COLOR_BG, r_up, g_up, b_up);
printf(ESC_COLOR_FG, r_down, g_down, b_down);
}
printf("\xe2\x96\x84"); // UTF8 bytes of U+2584 (lower half block)
}
printf(ESC_CLEAR_COLORS);
}
printf("\n");
}
static void get_win_size(struct vo *vo, int *out_width, int *out_height) {
struct priv *p = vo->priv;
#if HAVE_POSIX
struct winsize winsize;
ioctl(STDOUT_FILENO, TIOCGWINSZ, &winsize);
*out_width = winsize.ws_col;
*out_height = winsize.ws_row;
#else
*out_width = DEFAULT_WIDTH;
*out_height = DEFAULT_HEIGHT;
#endif
if (p->opts->width > 0)
*out_width = p->opts->width;
if (p->opts->height > 0)
*out_height = p->opts->height;
}
static int reconfig(struct vo *vo, struct mp_image_params *params)
{
struct priv *p = vo->priv;
get_win_size(vo, &vo->dwidth, &vo->dheight);
struct mp_osd_res osd;
vo_get_src_dst_rects(vo, &p->src, &p->dst, &osd);
p->swidth = p->dst.x1 - p->dst.x0;
p->sheight = p->dst.y1 - p->dst.y0;
if (p->buffer)
free(p->buffer);
mp_sws_set_from_cmdline(p->sws, vo->opts->sws_opts);
p->sws->src = *params;
p->sws->dst = (struct mp_image_params) {
.imgfmt = IMGFMT,
.w = p->swidth,
.h = p->sheight,
.p_w = 1,
.p_h = 1,
};
const int mul = (p->opts->algo == ALGO_PLAIN ? 1 : 2);
p->frame = mp_image_alloc(IMGFMT, p->swidth, p->sheight * mul);
if (!p->frame)
return -1;
if (mp_sws_reinit(p->sws) < 0)
return -1;
printf(ESC_HIDE_CURSOR);
printf(ESC_CLEAR_SCREEN);
vo->want_redraw = true;
return 0;
}
static void draw_image(struct vo *vo, mp_image_t *mpi)
{
struct priv *p = vo->priv;
struct mp_image src = *mpi;
// XXX: pan, crop etc.
mp_sws_scale(p->sws, p->frame, &src);
talloc_free(mpi);
}
static void flip_page(struct vo *vo)
{
struct priv *p = vo->priv;
if (p->opts->algo == ALGO_PLAIN) {
write_plain(
vo->dwidth, vo->dheight, p->swidth, p->sheight,
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p->frame->planes[0], p->frame->stride[0],
p->opts->term256);
} else {
write_half_blocks(
vo->dwidth, vo->dheight, p->swidth, p->sheight,
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p->frame->planes[0], p->frame->stride[0],
p->opts->term256);
}
fflush(stdout);
}
static void uninit(struct vo *vo)
{
printf(ESC_RESTORE_CURSOR);
printf(ESC_CLEAR_SCREEN);
printf(ESC_GOTOXY, 0, 0);
struct priv *p = vo->priv;
if (p->buffer)
talloc_free(p->buffer);
if (p->sws)
talloc_free(p->sws);
}
static int preinit(struct vo *vo)
{
// most terminal characters aren't 1:1, so we default to 2:1.
// if user passes their own value of choice, it'll be scaled accordingly.
vo->monitor_par = vo->opts->monitor_pixel_aspect * 2;
struct priv *p = vo->priv;
p->opts = mp_get_config_group(vo, vo->global, &vo_tct_conf);
p->sws = mp_sws_alloc(vo);
return 0;
}
static int query_format(struct vo *vo, int format)
{
return format == IMGFMT;
}
static int control(struct vo *vo, uint32_t request, void *data)
{
return VO_NOTIMPL;
}
const struct vo_driver video_out_tct = {
.name = "tct",
.description = "true-color terminals",
.preinit = preinit,
.query_format = query_format,
.reconfig = reconfig,
.control = control,
.draw_image = draw_image,
.flip_page = flip_page,
.uninit = uninit,
.priv_size = sizeof(struct priv),
.global_opts = &vo_tct_conf,
};