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