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
26 //#define DEBUG_PACKET_CONTENTS
28 /* Parser (mostly) copied from dvdsub.c */
30 #define PARSE_BUF_SIZE (65536)
33 /* parser definition */
34 typedef struct DVBSubParseContext {
41 static av_cold int dvbsub_parse_init(AVCodecParserContext *s)
43 DVBSubParseContext *pc = s->priv_data;
44 pc->packet_buf = av_malloc(PARSE_BUF_SIZE);
49 static int dvbsub_parse(AVCodecParserContext *s,
50 AVCodecContext *avctx,
51 const uint8_t **poutbuf, int *poutbuf_size,
52 const uint8_t *buf, int buf_size)
54 DVBSubParseContext *pc = s->priv_data;
58 dprintf(avctx, "DVB parse packet pts=%"PRIx64", lpts=%"PRIx64", cpts=%"PRIx64":\n",
59 s->pts, s->last_pts, s->cur_frame_pts[s->cur_frame_start_index]);
61 #ifdef DEBUG_PACKET_CONTENTS
64 for (i=0; i < buf_size; i++)
66 av_log(avctx, AV_LOG_INFO, "%02x ", buf[i]);
68 av_log(avctx, AV_LOG_INFO, "\n");
72 av_log(avctx, AV_LOG_INFO, "\n");
79 s->fetch_timestamp = 1;
81 if (s->last_pts != s->pts && s->pts != AV_NOPTS_VALUE) /* Start of a new packet */
83 if (pc->packet_index != pc->packet_start)
85 dprintf(avctx, "Discarding %d bytes\n",
86 pc->packet_index - pc->packet_start);
92 if (buf_size < 2 || buf[0] != 0x20 || buf[1] != 0x00) {
93 dprintf(avctx, "Bad packet header\n");
101 if (pc->packet_start != 0)
103 if (pc->packet_index != pc->packet_start)
105 memmove(pc->packet_buf, pc->packet_buf + pc->packet_start,
106 pc->packet_index - pc->packet_start);
108 pc->packet_index -= pc->packet_start;
109 pc->packet_start = 0;
111 pc->packet_start = 0;
112 pc->packet_index = 0;
117 if (buf_size - buf_pos + pc->packet_index > PARSE_BUF_SIZE)
120 /* if not currently in a packet, discard data */
121 if (pc->in_packet == 0)
124 memcpy(pc->packet_buf + pc->packet_index, buf + buf_pos, buf_size - buf_pos);
125 pc->packet_index += buf_size - buf_pos;
128 p_end = pc->packet_buf + pc->packet_index;
136 len = AV_RB16(p + 4);
138 if (p + len + 6 <= p_end)
140 *poutbuf_size += len + 6;
147 } else if (*p == 0xff) {
150 dprintf(avctx, "Junk at end of packet\n");
152 pc->packet_index = p - pc->packet_buf;
156 av_log(avctx, AV_LOG_ERROR, "Junk in packet\n");
158 pc->packet_index = p - pc->packet_buf;
164 if (*poutbuf_size > 0)
166 *poutbuf = pc->packet_buf;
167 pc->packet_start = *poutbuf_size;
170 if (s->pts == AV_NOPTS_VALUE)
171 s->pts = s->last_pts;
176 static av_cold void dvbsub_parse_close(AVCodecParserContext *s)
178 DVBSubParseContext *pc = s->priv_data;
179 av_freep(&pc->packet_buf);
182 AVCodecParser dvbsub_parser = {
183 { CODEC_ID_DVB_SUBTITLE },
184 sizeof(DVBSubParseContext),