av_sub.c

   1 /*
   2  * This file is part of MPlayer.
   3  *
   4  * MPlayer is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * MPlayer is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with MPlayer; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 #include <libavcodec/avcodec.h>
  20
  21 #include "libmpdemux/stheader.h"
  22 #include "libvo/sub.h"
  23 #include "spudec.h"
  24 #include "av_sub.h"
  25
  26 void reset_avsub(struct sh_sub *sh)
  27 {
  28     if (sh->context) {
  29         avcodec_close(sh->context);
  30         av_freep(&sh->context);
  31     }
  32 }
  33
  34 /**
  35  * Decode a subtitle packet via libavcodec.
  36  * \return < 0 on error, > 0 if further processing is needed
  37  */
  38 int decode_avsub(struct sh_sub *sh, uint8_t **data, int *size, double *pts, double *endpts)
  39 {
  40     AVCodecContext *ctx = sh->context;
  41     int new_type = 0;
  42     int res;
  43     int got_sub;
  44     AVSubtitle sub;
  45     AVPacket pkt;
  46     av_init_packet(&pkt);
  47     pkt.data = *data;
  48     pkt.size = *size;
  49     pkt.pts = *pts * 1000;
  50     if (*pts != MP_NOPTS_VALUE && *endpts != MP_NOPTS_VALUE)
  51         pkt.convergence_duration = (*endpts - *pts) * 1000;
  52     if (!ctx) {
  53         AVCodec *sub_codec;
  54         avcodec_init();
  55         avcodec_register_all();
  56         ctx = avcodec_alloc_context();
  57         sub_codec = avcodec_find_decoder(CODEC_ID_HDMV_PGS_SUBTITLE);
  58         if (!ctx || !sub_codec || avcodec_open(ctx, sub_codec) < 0) {
  59             mp_msg(MSGT_SUBREADER, MSGL_FATAL, "Could not open subtitle decoder\n");
  60             av_freep(&ctx);
  61             return -1;
  62         }
  63         sh->context = ctx;
  64     }
  65     res = avcodec_decode_subtitle2(ctx, &sub, &got_sub, &pkt);
  66     if (res < 0)
  67         return res;
  68     if (*pts != MP_NOPTS_VALUE) {
  69         if (sub.end_display_time > sub.start_display_time)
  70             *endpts = *pts + sub.end_display_time / 1000.0;
  71         *pts += sub.start_display_time / 1000.0;
  72     }
  73     if (got_sub && sub.num_rects > 0) {
  74         switch (sub.rects[0]->type) {
  75         case SUBTITLE_BITMAP:
  76             if (!vo_spudec)
  77                 vo_spudec = spudec_new(NULL);
  78             spudec_set_paletted(vo_spudec,
  79                                 sub.rects[0]->pict.data[0],
  80                                 sub.rects[0]->pict.linesize[0],
  81                                 sub.rects[0]->pict.data[1],
  82                                 sub.rects[0]->x,
  83                                 sub.rects[0]->y,
  84                                 sub.rects[0]->w,
  85                                 sub.rects[0]->h,
  86                                 *pts,
  87                                 *endpts);
  88             vo_osd_changed(OSDTYPE_SPU);
  89             break;
  90         case SUBTITLE_TEXT:
  91             *data = strdup(sub.rects[0]->text);
  92             new_type = 't';
  93             break;
  94         case SUBTITLE_ASS:
  95             *data = strdup(sub.rects[0]->ass);
  96             new_type = 'a';
  97             break;
  98         }
  99     }
 100 #if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(52, 82, 0)
 101     if (got_sub)
 102         avsubtitle_free(&sub);
 103 #endif
 104     return new_type;
 105 }