2 * DVB subtitle parser for FFmpeg
3 * Copyright (c) 2005 Ian Caulfield
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 /* Parser (mostly) copied from dvdsub.c */
26 #define PARSE_BUF_SIZE (65536)
29 /* parser definition */
30 typedef struct DVBSubParseContext
{
37 static av_cold
int dvbsub_parse_init(AVCodecParserContext
*s
)
39 DVBSubParseContext
*pc
= s
->priv_data
;
40 pc
->packet_buf
= av_malloc(PARSE_BUF_SIZE
);
45 static int dvbsub_parse(AVCodecParserContext
*s
,
46 AVCodecContext
*avctx
,
47 const uint8_t **poutbuf
, int *poutbuf_size
,
48 const uint8_t *buf
, int buf_size
)
50 DVBSubParseContext
*pc
= s
->priv_data
;
52 int i
, len
, buf_pos
= 0;
54 av_dlog(avctx
, "DVB parse packet pts=%"PRIx64
", lpts=%"PRIx64
", cpts=%"PRIx64
":\n",
55 s
->pts
, s
->last_pts
, s
->cur_frame_pts
[s
->cur_frame_start_index
]);
57 for (i
=0; i
< buf_size
; i
++)
59 av_dlog(avctx
, "%02x ", buf
[i
]);
70 s
->fetch_timestamp
= 1;
72 if (s
->last_pts
!= s
->pts
&& s
->pts
!= AV_NOPTS_VALUE
) /* Start of a new packet */
74 if (pc
->packet_index
!= pc
->packet_start
)
76 av_dlog(avctx
, "Discarding %d bytes\n",
77 pc
->packet_index
- pc
->packet_start
);
83 if (buf_size
< 2 || buf
[0] != 0x20 || buf
[1] != 0x00) {
84 av_dlog(avctx
, "Bad packet header\n");
92 if (pc
->packet_start
!= 0)
94 if (pc
->packet_index
!= pc
->packet_start
)
96 memmove(pc
->packet_buf
, pc
->packet_buf
+ pc
->packet_start
,
97 pc
->packet_index
- pc
->packet_start
);
99 pc
->packet_index
-= pc
->packet_start
;
100 pc
->packet_start
= 0;
102 pc
->packet_start
= 0;
103 pc
->packet_index
= 0;
108 if (buf_size
- buf_pos
+ pc
->packet_index
> PARSE_BUF_SIZE
)
111 /* if not currently in a packet, discard data */
112 if (pc
->in_packet
== 0)
115 memcpy(pc
->packet_buf
+ pc
->packet_index
, buf
+ buf_pos
, buf_size
- buf_pos
);
116 pc
->packet_index
+= buf_size
- buf_pos
;
119 p_end
= pc
->packet_buf
+ pc
->packet_index
;
127 len
= AV_RB16(p
+ 4);
129 if (p
+ len
+ 6 <= p_end
)
131 *poutbuf_size
+= len
+ 6;
138 } else if (*p
== 0xff) {
141 av_dlog(avctx
, "Junk at end of packet\n");
143 pc
->packet_index
= p
- pc
->packet_buf
;
147 av_log(avctx
, AV_LOG_ERROR
, "Junk in packet\n");
149 pc
->packet_index
= p
- pc
->packet_buf
;
155 if (*poutbuf_size
> 0)
157 *poutbuf
= pc
->packet_buf
;
158 pc
->packet_start
= *poutbuf_size
;
161 if (s
->pts
== AV_NOPTS_VALUE
)
162 s
->pts
= s
->last_pts
;
167 static av_cold
void dvbsub_parse_close(AVCodecParserContext
*s
)
169 DVBSubParseContext
*pc
= s
->priv_data
;
170 av_freep(&pc
->packet_buf
);
173 AVCodecParser ff_dvbsub_parser
= {
174 .codec_ids
= { AV_CODEC_ID_DVB_SUBTITLE
},
175 .priv_data_size
= sizeof(DVBSubParseContext
),
176 .parser_init
= dvbsub_parse_init
,
177 .parser_parse
= dvbsub_parse
,
178 .parser_close
= dvbsub_parse_close
,