mpv/screenshot.c

543 lines
16 KiB
C

/*
* 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include <setjmp.h>
#include <time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <libswscale/swscale.h>
#include <libavcodec/avcodec.h>
#include "config.h"
#ifdef CONFIG_JPEG
#include <jpeglib.h>
#endif
#include "talloc.h"
#include "screenshot.h"
#include "mp_core.h"
#include "m_property.h"
#include "bstr.h"
#include "mp_msg.h"
#include "metadata.h"
#include "libmpcodecs/img_format.h"
#include "libmpcodecs/mp_image.h"
#include "libmpcodecs/dec_video.h"
#include "libmpcodecs/vf.h"
#include "libvo/video_out.h"
#include "fmt-conversion.h"
//for sws_getContextFromCmdLine_hq and mp_sws_set_colorspace
#include "libmpcodecs/vf_scale.h"
#include "libvo/csputils.h"
typedef struct screenshot_ctx {
struct MPContext *mpctx;
int full_window;
int each_frame;
int using_vf_screenshot;
int frameno;
} screenshot_ctx;
struct img_writer {
const char *file_ext;
int (*write)(screenshot_ctx *ctx, mp_image_t *image, FILE *fp);
};
void screenshot_init(struct MPContext *mpctx)
{
mpctx->screenshot_ctx = talloc(mpctx, screenshot_ctx);
*mpctx->screenshot_ctx = (screenshot_ctx) {
.mpctx = mpctx,
.frameno = 1,
};
}
static int write_png(screenshot_ctx *ctx, struct mp_image *image, FILE *fp)
{
void *outbuffer = NULL;
int success = 0;
struct AVCodec *png_codec = avcodec_find_encoder(CODEC_ID_PNG);
AVCodecContext *avctx = NULL;
if (!png_codec)
goto print_open_fail;
avctx = avcodec_alloc_context3(png_codec);
if (!avctx)
goto print_open_fail;
avctx->time_base = AV_TIME_BASE_Q;
avctx->width = image->width;
avctx->height = image->height;
avctx->pix_fmt = PIX_FMT_RGB24;
avctx->compression_level = ctx->mpctx->opts.screenshot_png_compression;
if (avcodec_open2(avctx, png_codec, NULL) < 0) {
print_open_fail:
mp_msg(MSGT_CPLAYER, MSGL_INFO, "Could not open libavcodec PNG encoder"
" for saving screenshot\n");
goto error_exit;
}
size_t outbuffer_size = image->width * image->height * 3 * 2;
outbuffer = malloc(outbuffer_size);
if (!outbuffer)
goto error_exit;
AVFrame pic;
avcodec_get_frame_defaults(&pic);
for (int n = 0; n < 4; n++) {
pic.data[n] = image->planes[n];
pic.linesize[n] = image->stride[n];
}
int size = avcodec_encode_video(avctx, outbuffer, outbuffer_size, &pic);
if (size < 1)
goto error_exit;
fwrite(outbuffer, size, 1, fp);
success = 1;
error_exit:
if (avctx)
avcodec_close(avctx);
av_free(avctx);
free(outbuffer);
return success;
}
#ifdef CONFIG_JPEG
static void write_jpeg_error_exit(j_common_ptr cinfo)
{
// NOTE: do not write error message, too much effort to connect the libjpeg
// log callbacks with mplayer's log function mp_msp()
// Return control to the setjmp point
longjmp(*(jmp_buf*)cinfo->client_data, 1);
}
static int write_jpeg(screenshot_ctx *ctx, mp_image_t *image, FILE *fp)
{
struct jpeg_compress_struct cinfo;
struct jpeg_error_mgr jerr;
cinfo.err = jpeg_std_error(&jerr);
jerr.error_exit = write_jpeg_error_exit;
jmp_buf error_return_jmpbuf;
cinfo.client_data = &error_return_jmpbuf;
if (setjmp(cinfo.client_data)) {
jpeg_destroy_compress(&cinfo);
return 0;
}
jpeg_create_compress(&cinfo);
jpeg_stdio_dest(&cinfo, fp);
cinfo.image_width = image->width;
cinfo.image_height = image->height;
cinfo.input_components = 3;
cinfo.in_color_space = JCS_RGB;
jpeg_set_defaults(&cinfo);
jpeg_set_quality(&cinfo, ctx->mpctx->opts.screenshot_jpeg_quality, 1);
jpeg_start_compress(&cinfo, TRUE);
while (cinfo.next_scanline < cinfo.image_height) {
JSAMPROW row_pointer[1];
row_pointer[0] = image->planes[0] +
cinfo.next_scanline * image->stride[0];
jpeg_write_scanlines(&cinfo, row_pointer,1);
}
jpeg_finish_compress(&cinfo);
jpeg_destroy_compress(&cinfo);
return 1;
}
#endif
static const struct img_writer img_writers[] = {
{ "png", write_png },
#ifdef CONFIG_JPEG
{ "jpg", write_jpeg },
{ "jpeg", write_jpeg },
#endif
};
static const struct img_writer *get_writer(screenshot_ctx *ctx)
{
const char *type = ctx->mpctx->opts.screenshot_filetype;
for (size_t n = 0; n < sizeof(img_writers) / sizeof(img_writers[0]); n++) {
const struct img_writer *writer = &img_writers[n];
if (type && strcmp(type, writer->file_ext) == 0)
return writer;
}
return &img_writers[0];
}
static int fexists(char *fname)
{
struct stat dummy;
if (stat(fname, &dummy) == 0)
return 1;
else
return 0;
}
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", end - s, s);
}
static char *format_time(void *talloc_ctx, double time, bool sub_seconds)
{
int h, m, s = time;
h = s / 3600;
s -= h * 3600;
m = s / 60;
s -= m * 60;
char *res = talloc_asprintf(talloc_ctx, "%02d:%02d:%02d", h, m, s);
if (sub_seconds)
res = talloc_asprintf_append(res, ".%03d",
(int)((time - (int)time) * 1000));
return res;
}
static char *do_format_property(struct MPContext *mpctx, struct bstr s) {
struct bstr prop_name = s;
int fallbackpos = bstrchr(s, ':');
if (fallbackpos >= 0)
prop_name = bstr_splice(prop_name, 0, fallbackpos);
char *pn = bstrdup0(NULL, prop_name);
char *res = mp_property_print(pn, mpctx);
talloc_free(pn);
if (!res && fallbackpos >= 0)
res = bstrdup0(NULL, bstr_cut(s, fallbackpos + 1));
return res;
}
#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 = get_metadata(mpctx, META_NAME);
if (video_file) {
char *name = video_file;
if (fmt == 'F')
name = stripext(res, video_file);
append_filename(&res, name);
}
talloc_free(video_file);
break;
}
case 'p':
case 'P':
append_filename(&res,
format_time(res, get_current_time(mpctx), fmt == 'P'));
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(bstr(template), 0, end - template);
template = end + 1;
char *s = do_format_property(mpctx, prop);
if (s)
append_filename(&res, s);
talloc_free(s);
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)
{
int sequence = 0;
for (;;) {
int prev_sequence = sequence;
char *fname = create_fname(ctx->mpctx,
ctx->mpctx->opts.screenshot_template,
get_writer(ctx)->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 (!fexists(fname))
return fname;
talloc_free(fname);
if (sequence == prev_sequence) {
mp_msg(MSGT_CPLAYER, MSGL_ERR, "Can't save screenshot, file "
"already exists!\n");
return NULL;
}
}
}
void screenshot_save(struct MPContext *mpctx, struct mp_image *image)
{
screenshot_ctx *ctx = mpctx->screenshot_ctx;
const struct img_writer *writer = get_writer(ctx);
struct mp_image *allocated_image = NULL;
const int destfmt = IMGFMT_RGB24;
if (image->imgfmt != destfmt) {
struct mp_image *dst = alloc_mpi(image->w, image->h, destfmt);
struct SwsContext *sws = sws_getContextFromCmdLine_hq(image->width,
image->height,
image->imgfmt,
dst->width,
dst->height,
dst->imgfmt);
struct mp_csp_details colorspace;
get_detected_video_colorspace(mpctx->sh_video, &colorspace);
// this is a property of the output device; images always use
// full-range RGB
colorspace.levels_out = MP_CSP_LEVELS_PC;
mp_sws_set_colorspace(sws, &colorspace);
sws_scale(sws, (const uint8_t **)image->planes, image->stride, 0,
image->height, dst->planes, dst->stride);
sws_freeContext(sws);
allocated_image = dst;
image = dst;
}
char *filename = gen_fname(ctx);
if (filename) {
FILE *fp = fopen(filename, "wb");
if (fp == NULL) {
mp_msg(MSGT_CPLAYER, MSGL_ERR, "\nError opening %s for writing!\n",
filename);
} else {
mp_msg(MSGT_CPLAYER, MSGL_INFO, "*** screenshot '%s' ***\n",
filename);
int success = writer->write(ctx, image, fp);
success = !fclose(fp) && success;
if (!success)
mp_msg(MSGT_CPLAYER, MSGL_ERR, "Error writing screenshot!\n");
}
talloc_free(filename);
}
free_mp_image(allocated_image);
}
static void vf_screenshot_callback(void *pctx, struct mp_image *image)
{
struct MPContext *mpctx = (struct MPContext *)pctx;
screenshot_ctx *ctx = mpctx->screenshot_ctx;
screenshot_save(mpctx, image);
if (ctx->each_frame)
screenshot_request(mpctx, 0, ctx->full_window);
}
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, bool each_frame,
bool full_window)
{
if (mpctx->video_out && mpctx->video_out->config_ok) {
screenshot_ctx *ctx = mpctx->screenshot_ctx;
ctx->using_vf_screenshot = 0;
if (each_frame) {
ctx->each_frame = !ctx->each_frame;
ctx->full_window = full_window;
if (!ctx->each_frame)
return;
}
struct voctrl_screenshot_args args = { .full_window = full_window };
if (!force_vf(mpctx)
&& vo_control(mpctx->video_out, VOCTRL_SCREENSHOT, &args) == true)
{
screenshot_save(mpctx, args.out_image);
free_mp_image(args.out_image);
} else {
mp_msg(MSGT_CPLAYER, MSGL_INFO, "No VO support for taking"
" screenshots, trying VFCTRL_SCREENSHOT!\n");
ctx->using_vf_screenshot = 1;
struct vf_ctrl_screenshot cmd = {
.image_callback = vf_screenshot_callback,
.image_callback_ctx = mpctx,
};
struct vf_instance *vfilter = mpctx->sh_video->vfilter;
if (vfilter->control(vfilter, VFCTRL_SCREENSHOT, &cmd) !=
CONTROL_OK)
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;
// screenshot_flip is called when the VO presents a new frame. vf_screenshot
// can behave completely different (consider filters inserted between
// vf_screenshot and vf_vo, that add or remove frames), so handle this case
// somewhere else.
if (ctx->using_vf_screenshot)
return;
screenshot_request(mpctx, 0, ctx->full_window);
}