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,
  39                  double *pts, double *endpts)
  40 {
  41     AVCodecContext *ctx = sh->context;
  42     enum CodecID cid = CODEC_ID_NONE;
  43     int new_type = 0;
  44     int res;
  45     int got_sub;
  46     AVSubtitle sub;
  47     AVPacket pkt;
  48
  49     switch (sh->type) {
  50     case 'b':
  51         cid = CODEC_ID_DVB_SUBTITLE; break;
  52     case 'p':
  53         cid = CODEC_ID_HDMV_PGS_SUBTITLE; break;
  54     case 'x':
  55         cid = CODEC_ID_XSUB; break;
  56     }
  57
  58     av_init_packet(&pkt);
  59     pkt.data = *data;
  60     pkt.size = *size;
  61     pkt.pts = *pts * 1000;
  62     if (*pts != MP_NOPTS_VALUE && *endpts != MP_NOPTS_VALUE)
  63         pkt.convergence_duration = (*endpts - *pts) * 1000;
  64     if (!ctx) {
  65         AVCodec *sub_codec;
  66         avcodec_init();
  67         avcodec_register_all();
  68         ctx = avcodec_alloc_context();
  69         sub_codec = avcodec_find_decoder(cid);
  70         if (!ctx || !sub_codec || avcodec_open(ctx, sub_codec) < 0) {
  71             mp_msg(MSGT_SUBREADER, MSGL_FATAL,
  72                    "Could not open subtitle decoder\n");
  73             av_freep(&ctx);
  74             return -1;
  75         }
  76         sh->context = ctx;
  77     }
  78     res = avcodec_decode_subtitle2(ctx, &sub, &got_sub, &pkt);
  79     if (res < 0)
  80         return res;
  81     if (*pts != MP_NOPTS_VALUE) {
  82         if (sub.end_display_time > sub.start_display_time)
  83             *endpts = *pts + sub.end_display_time / 1000.0;
  84         *pts += sub.start_display_time / 1000.0;
  85     }
  86     if (got_sub && vo_spudec && sub.num_rects == 0)
  87         spudec_set_paletted(vo_spudec, NULL, 0, NULL, 0, 0, 0, 0, *pts, *endpts);
  88     if (got_sub && sub.num_rects > 0) {
  89         switch (sub.rects[0]->type) {
  90         case SUBTITLE_BITMAP:
  91             if (!vo_spudec)
  92                 vo_spudec = spudec_new_scaled(NULL, ctx->width, ctx->height, NULL, 0);
  93             spudec_set_paletted(vo_spudec,
  94                                 sub.rects[0]->pict.data[0],
  95                                 sub.rects[0]->pict.linesize[0],
  96                                 sub.rects[0]->pict.data[1],
  97                                 sub.rects[0]->x,
  98                                 sub.rects[0]->y,
  99                                 sub.rects[0]->w,
 100                                 sub.rects[0]->h,
 101                                 *pts,
 102                                 *endpts);
 103             vo_osd_changed(OSDTYPE_SPU);
 104             break;
 105         case SUBTITLE_TEXT:
 106             *data = strdup(sub.rects[0]->text);
 107             *size = strlen(*data);
 108             new_type = 't';
 109             break;
 110         case SUBTITLE_ASS:
 111             *data = strdup(sub.rects[0]->ass);
 112             *size = strlen(*data);
 113             new_type = 'a';
 114             break;
 115         }
 116     }
 117 #if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(52, 82, 0)
 118     if (got_sub)
 119         avsubtitle_free(&sub);
 120 #endif
 121     return new_type;
 122 }