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mpv/core/screenshot.c
wm4 6e0b730044 vf_screenshot: simplify 
Instead of using a callback to "capture" the image next time the filter
function is called, do it the other way around: on every filter
invocation, create a reference to the image, and return it if a
screenshot is requested. This also fixes the 1-frame delay when taking
screenshots with the filter.

This also allows simplifying screenshot.c.
2013-01-13 20:04:10 +01:00

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9.6 KiB
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/*
* This file is part of mplayer2.
*
* mplayer2 is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* mplayer2 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with mplayer2; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "config.h"
#include "osdep/io.h"
#include "talloc.h"
#include "core/screenshot.h"
#include "core/mp_core.h"
#include "core/command.h"
#include "core/bstr.h"
#include "core/mp_msg.h"
#include "core/path.h"
#include "video/mp_image.h"
#include "video/decode/dec_video.h"
#include "video/filter/vf.h"
#include "video/out/vo.h"
#include "video/image_writer.h"
#include "sub/sub.h"
#include "video/csputils.h"
#define MODE_FULL_WINDOW 1
#define MODE_SUBTITLES 2
typedef struct screenshot_ctx {
struct MPContext *mpctx;
int mode;
int each_frame;
int frameno;
} screenshot_ctx;
void screenshot_init(struct MPContext *mpctx)
{
mpctx->screenshot_ctx = talloc(mpctx, screenshot_ctx);
*mpctx->screenshot_ctx = (screenshot_ctx) {
.mpctx = mpctx,
.frameno = 1,
};
}
static char *stripext(void *talloc_ctx, const char *s)
{
const char *end = strrchr(s, '.');
if (!end)
end = s + strlen(s);
return talloc_asprintf(talloc_ctx, "%.*s", (int)(end - s), s);
}
#ifdef _WIN32
#define ILLEGAL_FILENAME_CHARS "?\"/\\<>*|:"
#else
#define ILLEGAL_FILENAME_CHARS "/"
#endif
// Replace all characters disallowed in filenames with '_' and return the newly
// allocated result string.
static char *sanitize_filename(void *talloc_ctx, const char *s)
{
char *res = talloc_strdup(talloc_ctx, s);
char *cur = res;
while (*cur) {
if (strchr(ILLEGAL_FILENAME_CHARS, *cur) || ((unsigned char)*cur) < 32)
*cur = '_';
cur++;
}
return res;
}
static void append_filename(char **s, const char *f)
{
char *append = sanitize_filename(NULL, f);
*s = talloc_strdup_append(*s, append);
talloc_free(append);
}
static char *create_fname(struct MPContext *mpctx, char *template,
const char *file_ext, int *sequence, int *frameno)
{
char *res = talloc_strdup(NULL, ""); //empty string, non-NULL context
time_t raw_time = time(NULL);
struct tm *local_time = localtime(&raw_time);
if (!template || *template == '\0')
template = "shot%n";
for (;;) {
char *next = strchr(template, '%');
if (!next)
break;
res = talloc_strndup_append(res, template, next - template);
template = next + 1;
char fmt = *template++;
switch (fmt) {
case '#':
case '0':
case 'n': {
int digits = '4';
if (fmt == '#') {
if (!*sequence) {
*frameno = 1;
}
fmt = *template++;
}
if (fmt == '0') {
digits = *template++;
if (digits < '0' || digits > '9')
goto error_exit;
fmt = *template++;
}
if (fmt != 'n')
goto error_exit;
char fmtstr[] = {'%', '0', digits, 'd', '\0'};
res = talloc_asprintf_append(res, fmtstr, *frameno);
if (*frameno < 100000 - 1) {
(*frameno) += 1;
(*sequence) += 1;
}
break;
}
case 'f':
case 'F': {
char *video_file = mp_basename(mpctx->filename);
if (video_file) {
char *name = video_file;
if (fmt == 'F')
name = stripext(res, video_file);
append_filename(&res, name);
}
break;
}
case 'p':
case 'P': {
char *t = mp_format_time(get_current_time(mpctx), fmt == 'P');
append_filename(&res, t);
talloc_free(t);
break;
}
case 't': {
char fmt = *template;
if (!fmt)
goto error_exit;
template++;
char fmtstr[] = {'%', fmt, '\0'};
char buffer[80];
if (strftime(buffer, sizeof(buffer), fmtstr, local_time) == 0)
buffer[0] = '\0';
append_filename(&res, buffer);
break;
}
case '{': {
char *end = strchr(template, '}');
if (!end)
goto error_exit;
struct bstr prop = bstr_splice(bstr0(template), 0, end - template);
char *tmp = talloc_asprintf(NULL, "${%.*s}", BSTR_P(prop));
char *s = mp_property_expand_string(mpctx, tmp);
talloc_free(tmp);
if (s)
append_filename(&res, s);
talloc_free(s);
template = end + 1;
break;
}
case '%':
res = talloc_strdup_append(res, "%");
break;
default:
goto error_exit;
}
}
res = talloc_strdup_append(res, template);
return talloc_asprintf_append(res, ".%s", file_ext);
error_exit:
talloc_free(res);
return NULL;
}
static char *gen_fname(screenshot_ctx *ctx, const char *file_ext)
{
int sequence = 0;
for (;;) {
int prev_sequence = sequence;
char *fname = create_fname(ctx->mpctx,
ctx->mpctx->opts.screenshot_template,
file_ext,
&sequence,
&ctx->frameno);
if (!fname) {
mp_msg(MSGT_CPLAYER, MSGL_ERR, "Invalid screenshot filename "
"template! Fix or remove the --screenshot-template option."
"\n");
return NULL;
}
if (!mp_path_exists(fname))
return fname;
if (sequence == prev_sequence) {
mp_msg(MSGT_CPLAYER, MSGL_ERR, "Can't save screenshot, file '%s' "
"already exists!\n", fname);
talloc_free(fname);
return NULL;
}
talloc_free(fname);
}
}
static void add_subs(struct MPContext *mpctx, struct mp_image *image)
{
mp_image_make_writeable(image);
int d_w = image->display_w ? image->display_w : image->w;
int d_h = image->display_h ? image->display_h : image->h;
double sar = (double)image->w / image->h;
double dar = (double)d_w / d_h;
struct mp_osd_res res = {
.w = image->w,
.h = image->h,
.display_par = sar / dar,
.video_par = dar / sar,
};
osd_draw_on_image(mpctx->osd, res, mpctx->osd->vo_pts,
OSD_DRAW_SUB_ONLY, image);
}
static void screenshot_save(struct MPContext *mpctx, struct mp_image *image,
bool with_subs)
{
screenshot_ctx *ctx = mpctx->screenshot_ctx;
struct image_writer_opts *opts = mpctx->opts.screenshot_image_opts;
if (with_subs)
add_subs(mpctx, image);
char *filename = gen_fname(ctx, image_writer_file_ext(opts));
if (filename) {
mp_msg(MSGT_CPLAYER, MSGL_INFO, "*** screenshot '%s' ***\n", filename);
if (!write_image(image, opts, filename))
mp_msg(MSGT_CPLAYER, MSGL_ERR, "\nError writing screenshot!\n");
talloc_free(filename);
}
talloc_free(image);
}
static bool force_vf(struct MPContext *mpctx)
{
if (mpctx->sh_video) {
struct vf_instance *vf = mpctx->sh_video->vfilter;
while (vf) {
if (strcmp(vf->info->name, "screenshot_force") == 0)
return true;
vf = vf->next;
}
}
return false;
}
void screenshot_request(struct MPContext *mpctx, int mode, bool each_frame)
{
if (mpctx->video_out && mpctx->video_out->config_ok) {
screenshot_ctx *ctx = mpctx->screenshot_ctx;
if (mode == MODE_SUBTITLES && mpctx->osd->render_subs_in_filter)
mode = 0;
if (each_frame) {
ctx->each_frame = !ctx->each_frame;
if (!ctx->each_frame)
return;
} else {
ctx->each_frame = false;
}
ctx->mode = mode;
struct voctrl_screenshot_args args =
{ .full_window = (mode == MODE_FULL_WINDOW) };
if (!force_vf(mpctx))
vo_control(mpctx->video_out, VOCTRL_SCREENSHOT, &args);
if (!args.out_image) {
mp_msg(MSGT_CPLAYER, MSGL_INFO, "No VO support for taking"
" screenshots, trying VFCTRL_SCREENSHOT!\n");
struct vf_instance *vfilter = mpctx->sh_video->vfilter;
vfilter->control(vfilter, VFCTRL_SCREENSHOT, &args);
}
if (args.out_image) {
if (args.has_osd)
mode = 0;
screenshot_save(mpctx, args.out_image, mode == MODE_SUBTITLES);
} else {
mp_msg(MSGT_CPLAYER, MSGL_INFO,
"...failed (need --vf=screenshot?)\n");
}
}
}
void screenshot_flip(struct MPContext *mpctx)
{
screenshot_ctx *ctx = mpctx->screenshot_ctx;
if (!ctx->each_frame)
return;
ctx->each_frame = false;
screenshot_request(mpctx, ctx->mode, true);
}
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