mpv/video/out/vo_tct.c

347 lines
10 KiB
C

/*
* 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 "osdep/terminal.h"
#include "osdep/io.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 TERM_ESC_CLEAR_COLORS "\033[0m"
#define TERM_ESC_COLOR256_BG "\033[48;5"
#define TERM_ESC_COLOR256_FG "\033[38;5"
#define TERM_ESC_COLOR24BIT_BG "\033[48;2"
#define TERM_ESC_COLOR24BIT_FG "\033[38;2"
#define DEFAULT_WIDTH 80
#define DEFAULT_HEIGHT 25
struct vo_tct_opts {
int algo;
int width; // 0 -> default
int height; // 0 -> default
bool term256; // 0 -> true color
};
struct lut_item {
char str[4];
int width;
};
struct priv {
struct vo_tct_opts opts;
size_t buffer_size;
int swidth;
int sheight;
struct mp_image *frame;
struct mp_rect src;
struct mp_rect dst;
struct mp_sws_context *sws;
struct lut_item lut[256];
};
// 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 print_seq3(struct lut_item *lut, const char* prefix,
uint8_t r, uint8_t g, uint8_t b)
{
// The fwrite implementation is about 25% faster than the printf code
// (even if we use *.s with the lut values), however,
// on windows we need to use printf in order to translate escape sequences and
// UTF8 output for the console.
#ifndef _WIN32
fputs(prefix, stdout);
fwrite(lut[r].str, lut[r].width, 1, stdout);
fwrite(lut[g].str, lut[g].width, 1, stdout);
fwrite(lut[b].str, lut[b].width, 1, stdout);
fputc('m', stdout);
#else
printf("%s;%d;%d;%dm", prefix, (int)r, (int)g, (int)b);
#endif
}
static void print_seq1(struct lut_item *lut, const char* prefix, uint8_t c)
{
#ifndef _WIN32
fputs(prefix, stdout);
fwrite(lut[c].str, lut[c].width, 1, stdout);
fputc('m', stdout);
#else
printf("%s;%dm", prefix, (int)c);
#endif
}
static void write_plain(
const int dwidth, const int dheight,
const int swidth, const int sheight,
const unsigned char *source, const int source_stride,
bool term256, struct lut_item *lut)
{
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(TERM_ESC_GOTO_YX, ty + y, tx);
for (int x = 0; x < swidth; x++) {
unsigned char b = *row++;
unsigned char g = *row++;
unsigned char r = *row++;
if (term256) {
print_seq1(lut, TERM_ESC_COLOR256_BG, rgb_to_x256(r, g, b));
} else {
print_seq3(lut, TERM_ESC_COLOR24BIT_BG, r, g, b);
}
printf(" ");
}
printf(TERM_ESC_CLEAR_COLORS);
}
printf("\n");
}
static void write_half_blocks(
const int dwidth, const int dheight,
const int swidth, const int sheight,
unsigned char *source, int source_stride,
bool term256, struct lut_item *lut)
{
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(TERM_ESC_GOTO_YX, 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++;
if (term256) {
print_seq1(lut, TERM_ESC_COLOR256_BG, rgb_to_x256(r_up, g_up, b_up));
print_seq1(lut, TERM_ESC_COLOR256_FG, rgb_to_x256(r_down, g_down, b_down));
} else {
print_seq3(lut, TERM_ESC_COLOR24BIT_BG, r_up, g_up, b_up);
print_seq3(lut, TERM_ESC_COLOR24BIT_FG, r_down, g_down, b_down);
}
printf("\xe2\x96\x84"); // UTF8 bytes of U+2584 (lower half block)
}
printf(TERM_ESC_CLEAR_COLORS);
}
printf("\n");
}
static void get_win_size(struct vo *vo, int *out_width, int *out_height) {
struct priv *p = vo->priv;
*out_width = DEFAULT_WIDTH;
*out_height = DEFAULT_HEIGHT;
terminal_get_size(out_width, out_height);
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;
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);
if (p->frame)
talloc_free(p->frame);
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(TERM_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;
int width, height;
get_win_size(vo, &width, &height);
if (vo->dwidth != width || vo->dheight != height)
reconfig(vo, vo->params);
if (p->opts.algo == ALGO_PLAIN) {
write_plain(
vo->dwidth, vo->dheight, p->swidth, p->sheight,
p->frame->planes[0], p->frame->stride[0],
p->opts.term256, p->lut);
} else {
write_half_blocks(
vo->dwidth, vo->dheight, p->swidth, p->sheight,
p->frame->planes[0], p->frame->stride[0],
p->opts.term256, p->lut);
}
fflush(stdout);
}
static void uninit(struct vo *vo)
{
printf(TERM_ESC_RESTORE_CURSOR);
printf(TERM_ESC_NORMAL_SCREEN);
struct priv *p = vo->priv;
if (p->frame)
talloc_free(p->frame);
}
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->sws = mp_sws_alloc(vo);
p->sws->log = vo->log;
mp_sws_enable_cmdline_opts(p->sws, vo->global);
for (int i = 0; i < 256; ++i) {
char buff[8];
p->lut[i].width = snprintf(buff, sizeof(buff), ";%d", i);
memcpy(p->lut[i].str, buff, 4); // some strings may not end on a null byte, but that's ok.
}
printf(TERM_ESC_HIDE_CURSOR);
printf(TERM_ESC_ALT_SCREEN);
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;
}
#define OPT_BASE_STRUCT struct priv
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),
.priv_defaults = &(const struct priv) {
.opts.algo = ALGO_HALF_BLOCKS,
},
.options = (const m_option_t[]) {
{"algo", OPT_CHOICE(opts.algo,
{"plain", ALGO_PLAIN},
{"half-blocks", ALGO_HALF_BLOCKS})},
{"width", OPT_INT(opts.width)},
{"height", OPT_INT(opts.height)},
{"256", OPT_BOOL(opts.term256)},
{0}
},
.options_prefix = "vo-tct",
};