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1 | /* | ||
2 | * DVB subtitle parser for FFmpeg | ||
3 | * Copyright (c) 2005 Ian Caulfield | ||
4 | * | ||
5 | * This file is part of FFmpeg. | ||
6 | * | ||
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. | ||
11 | * | ||
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. | ||
16 | * | ||
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 | ||
20 | */ | ||
21 | |||
22 | #include <inttypes.h> | ||
23 | #include <string.h> | ||
24 | |||
25 | #include "libavutil/intreadwrite.h" | ||
26 | |||
27 | #include "avcodec.h" | ||
28 | |||
29 | /* Parser (mostly) copied from dvdsub.c */ | ||
30 | |||
31 | #define PARSE_BUF_SIZE (65536) | ||
32 | |||
33 | |||
34 | /* parser definition */ | ||
35 | typedef struct DVBSubParseContext { | ||
36 | int packet_start; | ||
37 | int packet_index; | ||
38 | int in_packet; | ||
39 | uint8_t packet_buf[PARSE_BUF_SIZE]; | ||
40 | } DVBSubParseContext; | ||
41 | |||
42 | 171 | static int dvbsub_parse(AVCodecParserContext *s, | |
43 | AVCodecContext *avctx, | ||
44 | const uint8_t **poutbuf, int *poutbuf_size, | ||
45 | const uint8_t *buf, int buf_size) | ||
46 | { | ||
47 | 171 | DVBSubParseContext *pc = s->priv_data; | |
48 | uint8_t *p, *p_end; | ||
49 | 171 | int i, len, buf_pos = 0; | |
50 | 171 | int out_size = 0; | |
51 | |||
52 | ff_dlog(avctx, "DVB parse packet pts=%"PRIx64", lpts=%"PRIx64", cpts=%"PRIx64":\n", | ||
53 | s->pts, s->last_pts, s->cur_frame_pts[s->cur_frame_start_index]); | ||
54 | |||
55 |
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186501 | for (i=0; i < buf_size; i++) |
56 | { | ||
57 | ff_dlog(avctx, "%02x ", buf[i]); | ||
58 | 186330 | if (i % 16 == 15) | |
59 | ff_dlog(avctx, "\n"); | ||
60 | } | ||
61 | |||
62 | 171 | if (i % 16 != 0) | |
63 | ff_dlog(avctx, "\n"); | ||
64 | |||
65 | 171 | *poutbuf = buf; | |
66 | 171 | *poutbuf_size = buf_size; | |
67 | |||
68 | 171 | s->fetch_timestamp = 1; | |
69 | |||
70 |
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171 | if (s->last_pts != s->pts && s->pts != AV_NOPTS_VALUE) /* Start of a new packet */ |
71 | { | ||
72 | 164 | if (pc->packet_index != pc->packet_start) | |
73 | { | ||
74 | ff_dlog(avctx, "Discarding %d bytes\n", | ||
75 | pc->packet_index - pc->packet_start); | ||
76 | } | ||
77 | |||
78 | 164 | pc->packet_start = 0; | |
79 | 164 | pc->packet_index = 0; | |
80 | |||
81 |
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164 | if (buf_size < 2 || buf[0] != 0x20 || buf[1] != 0x00) { |
82 | ff_dlog(avctx, "Bad packet header\n"); | ||
83 | ✗ | return buf_size; | |
84 | } | ||
85 | |||
86 | 164 | buf_pos = 2; | |
87 | |||
88 | 164 | pc->in_packet = 1; | |
89 | } else { | ||
90 |
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7 | if (pc->packet_start != 0) |
91 | { | ||
92 |
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6 | if (pc->packet_index != pc->packet_start) |
93 | { | ||
94 | 3 | memmove(pc->packet_buf, pc->packet_buf + pc->packet_start, | |
95 | 3 | pc->packet_index - pc->packet_start); | |
96 | |||
97 | 3 | pc->packet_index -= pc->packet_start; | |
98 | 3 | pc->packet_start = 0; | |
99 | } else { | ||
100 | 3 | pc->packet_start = 0; | |
101 | 3 | pc->packet_index = 0; | |
102 | } | ||
103 | } | ||
104 | } | ||
105 | |||
106 |
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171 | if (buf_size - buf_pos + pc->packet_index > PARSE_BUF_SIZE) |
107 | ✗ | return buf_size; | |
108 | |||
109 | /* if not currently in a packet, pass data */ | ||
110 |
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171 | if (pc->in_packet == 0) |
111 | 3 | return buf_size; | |
112 | |||
113 | 168 | memcpy(pc->packet_buf + pc->packet_index, buf + buf_pos, buf_size - buf_pos); | |
114 | 168 | pc->packet_index += buf_size - buf_pos; | |
115 | |||
116 | 168 | p = pc->packet_buf; | |
117 | 168 | p_end = pc->packet_buf + pc->packet_index; | |
118 | |||
119 |
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900 | while (p < p_end) |
120 | { | ||
121 |
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900 | if (*p == 0x0f) |
122 | { | ||
123 |
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737 | if (6 <= p_end - p) |
124 | { | ||
125 | 737 | len = AV_RB16(p + 4); | |
126 | |||
127 |
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737 | if (len + 6 <= p_end - p) |
128 | { | ||
129 | 732 | out_size += len + 6; | |
130 | |||
131 | 732 | p += len + 6; | |
132 | } else | ||
133 | 5 | break; | |
134 | } else | ||
135 | ✗ | break; | |
136 |
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163 | } else if (*p == 0xff) { |
137 | 163 | if (1 < p_end - p) | |
138 | { | ||
139 | ff_dlog(avctx, "Junk at end of packet\n"); | ||
140 | } | ||
141 | 163 | pc->packet_index = p - pc->packet_buf; | |
142 | 163 | pc->in_packet = 0; | |
143 | 163 | break; | |
144 | } else { | ||
145 | ✗ | av_log(avctx, AV_LOG_ERROR, "Junk in packet\n"); | |
146 | |||
147 | ✗ | pc->packet_index = p - pc->packet_buf; | |
148 | ✗ | pc->in_packet = 0; | |
149 | ✗ | break; | |
150 | } | ||
151 | } | ||
152 | |||
153 |
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168 | if (out_size > 0) |
154 | { | ||
155 | 166 | *poutbuf = pc->packet_buf; | |
156 | 166 | *poutbuf_size = out_size; | |
157 | 166 | pc->packet_start = *poutbuf_size; | |
158 | } | ||
159 | |||
160 |
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168 | if (s->pts == AV_NOPTS_VALUE) |
161 | 4 | s->pts = s->last_pts; | |
162 | |||
163 | 168 | return buf_size; | |
164 | } | ||
165 | |||
166 | const AVCodecParser ff_dvbsub_parser = { | ||
167 | .codec_ids = { AV_CODEC_ID_DVB_SUBTITLE }, | ||
168 | .priv_data_size = sizeof(DVBSubParseContext), | ||
169 | .parser_parse = dvbsub_parse, | ||
170 | }; | ||
171 |