sub/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 "mp_msg.h"
  22 #include "libmpdemux/stheader.h"
  23 #include "sub.h"
  24 #include "spudec.h"
  25 #include "av_sub.h"
  26
  27 void reset_avsub(struct sh_sub *sh)
  28 {
  29     if (sh->context) {
  30         avcodec_close(sh->context);
  31         av_freep(&sh->context);
  32     }
  33 }
  34
  35 /**
  36  * Decode a subtitle packet via libavcodec.
  37  * \return < 0 on error, > 0 if further processing is needed
  38  */
  39 int decode_avsub(struct sh_sub *sh, uint8_t *data, int size,
  40                  double pts, double duration)
  41 {
  42     AVCodecContext *ctx = sh->context;
  43     enum CodecID cid = CODEC_ID_NONE;
  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 (duration >= 0)
  63         pkt.convergence_duration = duration * 1000;
  64     if (!ctx) {
  65         AVCodec *sub_codec;
  66         ctx = avcodec_alloc_context();
  67         sub_codec = avcodec_find_decoder(cid);
  68         if (!ctx || !sub_codec || avcodec_open(ctx, sub_codec) < 0) {
  69             mp_msg(MSGT_SUBREADER, MSGL_FATAL,
  70                    "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             duration = (sub.end_display_time - sub.start_display_time) / 1000.0;
  82         pts += sub.start_display_time / 1000.0;
  83     }
  84     double endpts = MP_NOPTS_VALUE;
  85     if (pts != MP_NOPTS_VALUE && duration >= 0)
  86         endpts = pts + duration;
  87     if (got_sub && vo_spudec && sub.num_rects == 0)
  88         spudec_set_paletted(vo_spudec, NULL, 0, NULL, 0, 0, 0, 0, pts, endpts);
  89     if (got_sub && sub.num_rects > 0) {
  90         switch (sub.rects[0]->type) {
  91         case SUBTITLE_BITMAP:
  92             if (!vo_spudec)
  93                 vo_spudec = spudec_new_scaled(NULL, ctx->width, ctx->height, NULL, 0);
  94             spudec_set_paletted(vo_spudec,
  95                                 sub.rects[0]->pict.data[0],
  96                                 sub.rects[0]->pict.linesize[0],
  97                                 sub.rects[0]->pict.data[1],
  98                                 sub.rects[0]->x,
  99                                 sub.rects[0]->y,
 100                                 sub.rects[0]->w,
 101                                 sub.rects[0]->h,
 102                                 pts,
 103                                 endpts);
 104             vo_osd_changed(OSDTYPE_SPU);
 105             break;
 106         default:
 107             mp_msg(MSGT_SUBREADER, MSGL_ERR, "sd_avsub: unsupported subtitle "
 108                    "type from libavcodec\n");
 109             res = -1;
 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 res;
 118 }