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
23 #include "bitstream.h"
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 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;
59 av_log(avctx, AV_LOG_INFO, "DVB parse packet pts=%"PRIx64", lpts=%"PRIx64", cpts=%"PRIx64":\n",
60 s->pts, s->last_pts, s->cur_frame_pts[s->cur_frame_start_index]);
63 #ifdef DEBUG_PACKET_CONTENTS
66 for (i=0; i < buf_size; i++)
68 av_log(avctx, AV_LOG_INFO, "%02x ", buf[i]);
70 av_log(avctx, AV_LOG_INFO, "\n");
74 av_log(avctx, AV_LOG_INFO, "\n");
81 s->fetch_timestamp = 1;
83 if (s->last_pts != s->pts && s->last_pts != AV_NOPTS_VALUE) /* Start of a new packet */
85 if (pc->packet_index != pc->packet_start)
88 av_log(avctx, AV_LOG_INFO, "Discarding %d bytes\n",
89 pc->packet_index - pc->packet_start);
96 if (buf_size < 2 || buf[0] != 0x20 || buf[1] != 0x00) {
98 av_log(avctx, AV_LOG_INFO, "Bad packet header\n");
107 if (pc->packet_start != 0)
109 if (pc->packet_index != pc->packet_start)
111 memmove(pc->packet_buf, pc->packet_buf + pc->packet_start,
112 pc->packet_index - pc->packet_start);
114 pc->packet_index -= pc->packet_start;
115 pc->packet_start = 0;
117 pc->packet_start = 0;
118 pc->packet_index = 0;
123 if (buf_size - buf_pos + pc->packet_index > PARSE_BUF_SIZE)
126 /* if not currently in a packet, discard data */
127 if (pc->in_packet == 0)
130 memcpy(pc->packet_buf + pc->packet_index, buf + buf_pos, buf_size - buf_pos);
131 pc->packet_index += buf_size - buf_pos;
134 p_end = pc->packet_buf + pc->packet_index;
142 len = AV_RB16(p + 4);
144 if (p + len + 6 <= p_end)
146 *poutbuf_size += len + 6;
153 } else if (*p == 0xff) {
157 av_log(avctx, AV_LOG_INFO, "Junk at end of packet\n");
160 pc->packet_index = p - pc->packet_buf;
164 av_log(avctx, AV_LOG_ERROR, "Junk in packet\n");
166 pc->packet_index = p - pc->packet_buf;
172 if (*poutbuf_size > 0)
174 *poutbuf = pc->packet_buf;
175 pc->packet_start = *poutbuf_size;
178 if (s->last_pts == AV_NOPTS_VALUE)
179 s->last_pts = s->pts;
184 static void dvbsub_parse_close(AVCodecParserContext *s)
186 DVBSubParseContext *pc = s->priv_data;
187 av_freep(&pc->packet_buf);
190 AVCodecParser dvbsub_parser = {
191 { CODEC_ID_DVB_SUBTITLE },
192 sizeof(DVBSubParseContext),