src/video_output/snapshot.c

   1 /*****************************************************************************
   2  * snapshot.c : vout internal snapshot
   3  *****************************************************************************
   4  * Copyright (C) 2009 Laurent Aimar
   5  * $Id$
   6  *
   7  * Authors: Gildas Bazin <gbazin _AT_ videolan _DOT_ org>
   8  *          Laurent Aimar <fenrir _AT_ videolan _DOT_ org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU Lesser General Public License as published by
  12  * the Free Software Foundation; either version 2.1 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  18  * GNU Lesser General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public License
  21  * along with this program; if not, write to the Free Software Foundation,
  22  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  23  *****************************************************************************/
  24
  25 #ifdef HAVE_CONFIG_H
  26 # include "config.h"
  27 #endif
  28
  29 #include <assert.h>
  30 #include <sys/stat.h>
  31 #include <sys/types.h>
  32 #include <dirent.h>
  33 #include <time.h>
  34
  35 #include <vlc_common.h>
  36 #include <vlc_fs.h>
  37 #include <vlc_strings.h>
  38 #include <vlc_block.h>
  39 #include <vlc_vout.h>
  40
  41 #include "snapshot.h"
  42 #include "vout_internal.h"
  43
  44 /* */
  45 void vout_snapshot_Init(vout_snapshot_t *snap)
  46 {
  47     vlc_mutex_init(&snap->lock);
  48     vlc_cond_init(&snap->wait);
  49
  50     snap->is_available = true;
  51     snap->request_count = 0;
  52     snap->picture = NULL;
  53 }
  54 void vout_snapshot_Clean(vout_snapshot_t *snap)
  55 {
  56     picture_t *picture = snap->picture;
  57     while (picture) {
  58         picture_t *next = picture->p_next;
  59         picture_Release(picture);
  60         picture = next;
  61     }
  62
  63     vlc_cond_destroy(&snap->wait);
  64     vlc_mutex_destroy(&snap->lock);
  65 }
  66
  67 void vout_snapshot_End(vout_snapshot_t *snap)
  68 {
  69     vlc_mutex_lock(&snap->lock);
  70
  71     snap->is_available = false;
  72
  73     vlc_cond_broadcast(&snap->wait);
  74     vlc_mutex_unlock(&snap->lock);
  75 }
  76
  77 /* */
  78 picture_t *vout_snapshot_Get(vout_snapshot_t *snap, mtime_t timeout)
  79 {
  80     const mtime_t deadline = mdate() + timeout;
  81
  82     vlc_mutex_lock(&snap->lock);
  83
  84     /* */
  85     snap->request_count++;
  86
  87     /* */
  88     while (snap->is_available && !snap->picture &&
  89         vlc_cond_timedwait(&snap->wait, &snap->lock, deadline) == 0);
  90
  91     /* */
  92     picture_t *picture = snap->picture;
  93     if (picture)
  94         snap->picture = picture->p_next;
  95     else if (snap->request_count > 0)
  96         snap->request_count--;
  97
  98     vlc_mutex_unlock(&snap->lock);
  99
 100     return picture;
 101 }
 102
 103 /* */
 104 bool vout_snapshot_IsRequested(vout_snapshot_t *snap)
 105 {
 106     bool has_request = false;
 107     if (!vlc_mutex_trylock(&snap->lock)) {
 108         has_request = snap->request_count > 0;
 109         vlc_mutex_unlock(&snap->lock);
 110     }
 111     return has_request;
 112 }
 113 void vout_snapshot_Set(vout_snapshot_t *snap,
 114                        const video_format_t *fmt,
 115                        const picture_t *picture)
 116 {
 117     if (!fmt)
 118         fmt = &picture->format;
 119
 120     vlc_mutex_lock(&snap->lock);
 121     while (snap->request_count > 0) {
 122         picture_t *dup = picture_NewFromFormat(fmt);
 123         if (!dup)
 124             break;
 125
 126         picture_Copy(dup, picture);
 127
 128         dup->p_next = snap->picture;
 129         snap->picture = dup;
 130         snap->request_count--;
 131     }
 132     vlc_cond_broadcast(&snap->wait);
 133     vlc_mutex_unlock(&snap->lock);
 134 }
 135 /* */
 136 char *vout_snapshot_GetDirectory(void)
 137 {
 138     return config_GetUserDir(VLC_PICTURES_DIR);
 139 }
 140 /* */
 141 int vout_snapshot_SaveImage(char **name, int *sequential,
 142                              const block_t *image,
 143                              vout_thread_t *p_vout,
 144                              const vout_snapshot_save_cfg_t *cfg)
 145 {
 146     /* */
 147     char *filename;
 148     input_thread_t *input = (input_thread_t*)p_vout->p->input;
 149
 150     /* */
 151     char *prefix = NULL;
 152     if (cfg->prefix_fmt)
 153         prefix = str_format(input, cfg->prefix_fmt);
 154     if (prefix)
 155         filename_sanitize(prefix);
 156     else {
 157         prefix = strdup("vlcsnap-");
 158         if (prefix == NULL)
 159             goto error;
 160     }
 161
 162     struct stat st;
 163     bool b_is_folder = false;
 164
 165     if ( vlc_stat( cfg->path, &st ) == 0 )
 166         b_is_folder = S_ISDIR( st.st_mode );
 167     if ( b_is_folder ) {
 168         if (cfg->is_sequential) {
 169             for (int num = cfg->sequence; ; num++) {
 170                 if (asprintf(&filename, "%s" DIR_SEP "%s%05d.%s",
 171                              cfg->path, prefix, num, cfg->format) < 0) {
 172                     free(prefix);
 173                     goto error;
 174                 }
 175                 if (vlc_stat(filename, &st)) {
 176                     *sequential = num;
 177                     break;
 178                 }
 179                 free(filename);
 180             }
 181         } else {
 182             struct timespec ts;
 183             struct tm curtime;
 184             char buffer[128];
 185
 186             timespec_get(&ts, TIME_UTC);
 187             if (localtime_r(&ts.tv_sec, &curtime) == NULL)
 188                 gmtime_r(&ts.tv_sec, &curtime);
 189             if (strftime(buffer, sizeof(buffer), "%Y-%m-%d-%Hh%Mm%Ss",
 190                          &curtime) == 0)
 191                 strcpy(buffer, "error");
 192
 193             if (asprintf(&filename, "%s" DIR_SEP "%s%s%03lu.%s",
 194                          cfg->path, prefix, buffer, ts.tv_nsec / 1000000,
 195                          cfg->format) < 0)
 196                 filename = NULL;
 197         }
 198     } else {
 199         filename = strdup( cfg->path );
 200     }
 201     free(prefix);
 202
 203     if (!filename)
 204         goto error;
 205
 206     /* Save the snapshot */
 207     FILE *file = vlc_fopen(filename, "wb");
 208     if (!file) {
 209         msg_Err(p_vout, "Failed to open '%s'", filename);
 210         free(filename);
 211         goto error;
 212     }
 213     if (fwrite(image->p_buffer, image->i_buffer, 1, file) != 1) {
 214         msg_Err(p_vout, "Failed to write to '%s'", filename);
 215         fclose(file);
 216         free(filename);
 217         goto error;
 218     }
 219     fclose(file);
 220
 221     /* */
 222     if (name)
 223         *name = filename;
 224     else
 225         free(filename);
 226
 227     return VLC_SUCCESS;
 228
 229 error:
 230     msg_Err(p_vout, "could not save snapshot");
 231     return VLC_EGENERIC;
 232 }
 233