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         sub_codec = avcodec_find_decoder(cid);
  67         if (!sub_codec)
  68             goto error;
  69         ctx = avcodec_alloc_context3(sub_codec);
  70         if (!ctx)
  71             goto error;
  72         if (avcodec_open2(ctx, sub_codec, NULL) < 0) {
  73          error:
  74             mp_msg(MSGT_SUBREADER, MSGL_FATAL,
  75                    "Could not open subtitle decoder\n");
  76             av_freep(&ctx);
  77             return -1;
  78         }
  79         sh->context = ctx;
  80     }
  81     res = avcodec_decode_subtitle2(ctx, &sub, &got_sub, &pkt);
  82     if (res < 0)
  83         return res;
  84     if (pts != MP_NOPTS_VALUE) {
  85         if (sub.end_display_time > sub.start_display_time)
  86             duration = (sub.end_display_time - sub.start_display_time) / 1000.0;
  87         pts += sub.start_display_time / 1000.0;
  88     }
  89     double endpts = MP_NOPTS_VALUE;
  90     if (pts != MP_NOPTS_VALUE && duration >= 0)
  91         endpts = pts + duration;
  92     if (got_sub && vo_spudec && sub.num_rects == 0)
  93         spudec_set_paletted(vo_spudec, NULL, 0, NULL, 0, 0, 0, 0, pts, endpts);
  94     if (got_sub && sub.num_rects > 0) {
  95         switch (sub.rects[0]->type) {
  96         case SUBTITLE_BITMAP:
  97             if (!vo_spudec)
  98                 vo_spudec = spudec_new_scaled(NULL, ctx->width, ctx->height, NULL, 0);
  99             spudec_set_paletted(vo_spudec,
 100                                 sub.rects[0]->pict.data[0],
 101                                 sub.rects[0]->pict.linesize[0],
 102                                 sub.rects[0]->pict.data[1],
 103                                 sub.rects[0]->x,
 104                                 sub.rects[0]->y,
 105                                 sub.rects[0]->w,
 106                                 sub.rects[0]->h,
 107                                 pts,
 108                                 endpts);
 109             vo_osd_changed(OSDTYPE_SPU);
 110             break;
 111         default:
 112             mp_msg(MSGT_SUBREADER, MSGL_ERR, "sd_avsub: unsupported subtitle "
 113                    "type from libavcodec\n");
 114             res = -1;
 115             break;
 116         }
 117     }
 118     if (got_sub)
 119         avsubtitle_free(&sub);
 120     return res;
 121 }