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4349 | Serge | 1 | /* |
2 | * Metadata demuxer |
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3 | * Copyright (c) 2010 Anton Khirnov |
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4 | * |
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5 | * This file is part of FFmpeg. |
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6 | * |
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7 | * FFmpeg is free software; you can redistribute it and/or |
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8 | * modify it under the terms of the GNU Lesser General Public |
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9 | * License as published by the Free Software Foundation; either |
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10 | * version 2.1 of the License, or (at your option) any later version. |
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11 | * |
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12 | * FFmpeg is distributed in the hope that it will be useful, |
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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15 | * Lesser General Public License for more details. |
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16 | * |
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17 | * You should have received a copy of the GNU Lesser General Public |
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18 | * License along with FFmpeg; if not, write to the Free Software |
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19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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20 | */ |
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21 | |||
22 | #include "libavutil/mathematics.h" |
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23 | #include "avformat.h" |
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24 | #include "ffmeta.h" |
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25 | #include "internal.h" |
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26 | #include "libavutil/dict.h" |
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27 | |||
28 | static int probe(AVProbeData *p) |
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29 | { |
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30 | if(!memcmp(p->buf, ID_STRING, strlen(ID_STRING))) |
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31 | return AVPROBE_SCORE_MAX; |
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32 | return 0; |
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33 | } |
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34 | |||
35 | static void get_line(AVIOContext *s, uint8_t *buf, int size) |
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36 | { |
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37 | do { |
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38 | uint8_t c; |
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39 | int i = 0; |
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40 | |||
41 | while ((c = avio_r8(s))) { |
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42 | if (c == '\\') { |
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43 | if (i < size - 1) |
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44 | buf[i++] = c; |
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45 | c = avio_r8(s); |
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46 | } else if (c == '\n') |
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47 | break; |
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48 | |||
49 | if (i < size - 1) |
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50 | buf[i++] = c; |
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51 | } |
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52 | buf[i] = 0; |
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53 | } while (!url_feof(s) && (buf[0] == ';' || buf[0] == '#' || buf[0] == 0)); |
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54 | } |
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55 | |||
56 | static AVChapter *read_chapter(AVFormatContext *s) |
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57 | { |
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58 | uint8_t line[256]; |
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59 | int64_t start, end; |
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60 | AVRational tb = {1, 1e9}; |
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61 | |||
62 | get_line(s->pb, line, sizeof(line)); |
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63 | |||
64 | if (sscanf(line, "TIMEBASE=%d/%d", &tb.num, &tb.den)) |
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65 | get_line(s->pb, line, sizeof(line)); |
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66 | if (!sscanf(line, "START=%"SCNd64, &start)) { |
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67 | av_log(s, AV_LOG_ERROR, "Expected chapter start timestamp, found %s.\n", line); |
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68 | start = (s->nb_chapters && s->chapters[s->nb_chapters - 1]->end != AV_NOPTS_VALUE) ? |
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69 | s->chapters[s->nb_chapters - 1]->end : 0; |
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70 | } else |
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71 | get_line(s->pb, line, sizeof(line)); |
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72 | |||
73 | if (!sscanf(line, "END=%"SCNd64, &end)) { |
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74 | av_log(s, AV_LOG_ERROR, "Expected chapter end timestamp, found %s.\n", line); |
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75 | end = AV_NOPTS_VALUE; |
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76 | } |
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77 | |||
78 | return avpriv_new_chapter(s, s->nb_chapters, tb, start, end, NULL); |
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79 | } |
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80 | |||
81 | static uint8_t *unescape(uint8_t *buf, int size) |
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82 | { |
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83 | uint8_t *ret = av_malloc(size + 1); |
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84 | uint8_t *p1 = ret, *p2 = buf; |
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85 | |||
86 | if (!ret) |
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87 | return NULL; |
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88 | |||
89 | while (p2 < buf + size) { |
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90 | if (*p2 == '\\') |
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91 | p2++; |
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92 | *p1++ = *p2++; |
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93 | } |
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94 | *p1 = 0; |
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95 | return ret; |
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96 | } |
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97 | |||
98 | static int read_tag(uint8_t *line, AVDictionary **m) |
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99 | { |
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100 | uint8_t *key, *value, *p = line; |
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101 | |||
102 | /* find first not escaped '=' */ |
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103 | while (1) { |
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104 | if (*p == '=') |
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105 | break; |
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106 | else if (*p == '\\') |
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107 | p++; |
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108 | |||
109 | if (*p++) |
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110 | continue; |
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111 | |||
112 | return 0; |
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113 | } |
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114 | |||
115 | if (!(key = unescape(line, p - line))) |
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116 | return AVERROR(ENOMEM); |
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117 | if (!(value = unescape(p + 1, strlen(p + 1)))) { |
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118 | av_free(key); |
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119 | return AVERROR(ENOMEM); |
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120 | } |
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121 | |||
122 | av_dict_set(m, key, value, AV_DICT_DONT_STRDUP_KEY | AV_DICT_DONT_STRDUP_VAL); |
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123 | return 0; |
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124 | } |
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125 | |||
126 | static int read_header(AVFormatContext *s) |
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127 | { |
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128 | AVDictionary **m = &s->metadata; |
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129 | uint8_t line[1024]; |
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130 | |||
131 | while(!url_feof(s->pb)) { |
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132 | get_line(s->pb, line, sizeof(line)); |
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133 | |||
134 | if (!memcmp(line, ID_STREAM, strlen(ID_STREAM))) { |
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135 | AVStream *st = avformat_new_stream(s, NULL); |
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136 | |||
137 | if (!st) |
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138 | return AVERROR(ENOMEM); |
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139 | |||
140 | st->codec->codec_type = AVMEDIA_TYPE_DATA; |
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141 | st->codec->codec_id = AV_CODEC_ID_FFMETADATA; |
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142 | |||
143 | m = &st->metadata; |
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144 | } else if (!memcmp(line, ID_CHAPTER, strlen(ID_CHAPTER))) { |
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145 | AVChapter *ch = read_chapter(s); |
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146 | |||
147 | if (!ch) |
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148 | return AVERROR(ENOMEM); |
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149 | |||
150 | m = &ch->metadata; |
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151 | } else |
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152 | read_tag(line, m); |
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153 | } |
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154 | |||
155 | s->start_time = 0; |
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156 | if (s->nb_chapters) |
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157 | s->duration = av_rescale_q(s->chapters[s->nb_chapters - 1]->end, |
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158 | s->chapters[s->nb_chapters - 1]->time_base, |
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159 | AV_TIME_BASE_Q); |
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160 | |||
161 | return 0; |
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162 | } |
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163 | |||
164 | static int read_packet(AVFormatContext *s, AVPacket *pkt) |
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165 | { |
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166 | return AVERROR_EOF; |
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167 | } |
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168 | |||
169 | AVInputFormat ff_ffmetadata_demuxer = { |
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170 | .name = "ffmetadata", |
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171 | .long_name = NULL_IF_CONFIG_SMALL("FFmpeg metadata in text"), |
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172 | .read_probe = probe, |
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173 | .read_header = read_header, |
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174 | .read_packet = read_packet, |
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175 | };>>> |