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4349 | Serge | 1 | /* |
2 | * copyright (c) 2001 Fabrice Bellard |
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3 | * |
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4 | * This file is part of FFmpeg. |
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5 | * |
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6 | * FFmpeg is free software; you can redistribute it and/or |
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7 | * modify it under the terms of the GNU Lesser General Public |
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8 | * License as published by the Free Software Foundation; either |
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9 | * version 2.1 of the License, or (at your option) any later version. |
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10 | * |
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11 | * FFmpeg is distributed in the hope that it will be useful, |
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12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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14 | * Lesser General Public License for more details. |
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15 | * |
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16 | * You should have received a copy of the GNU Lesser General Public |
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17 | * License along with FFmpeg; if not, write to the Free Software |
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18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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19 | */ |
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20 | |||
21 | #ifndef AVFORMAT_INTERNAL_H |
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22 | #define AVFORMAT_INTERNAL_H |
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23 | |||
24 | #include |
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25 | #include "avformat.h" |
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26 | |||
27 | #define MAX_URL_SIZE 4096 |
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28 | |||
29 | /** size of probe buffer, for guessing file type from file contents */ |
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30 | #define PROBE_BUF_MIN 2048 |
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31 | #define PROBE_BUF_MAX (1<<20) |
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32 | |||
33 | #ifdef DEBUG |
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34 | # define hex_dump_debug(class, buf, size) av_hex_dump_log(class, AV_LOG_DEBUG, buf, size) |
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35 | #else |
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36 | # define hex_dump_debug(class, buf, size) |
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37 | #endif |
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38 | |||
39 | typedef struct AVCodecTag { |
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40 | enum AVCodecID id; |
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41 | unsigned int tag; |
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42 | } AVCodecTag; |
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43 | |||
44 | typedef struct CodecMime{ |
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45 | char str[32]; |
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46 | enum AVCodecID id; |
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47 | } CodecMime; |
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48 | |||
49 | #ifdef __GNUC__ |
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50 | #define dynarray_add(tab, nb_ptr, elem)\ |
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51 | do {\ |
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52 | __typeof__(tab) _tab = (tab);\ |
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53 | __typeof__(elem) _elem = (elem);\ |
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54 | (void)sizeof(**_tab == _elem); /* check that types are compatible */\ |
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55 | av_dynarray_add(_tab, nb_ptr, _elem);\ |
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56 | } while(0) |
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57 | #else |
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58 | #define dynarray_add(tab, nb_ptr, elem)\ |
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59 | do {\ |
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60 | av_dynarray_add((tab), nb_ptr, (elem));\ |
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61 | } while(0) |
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62 | #endif |
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63 | |||
64 | struct tm *ff_brktimegm(time_t secs, struct tm *tm); |
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65 | |||
66 | char *ff_data_to_hex(char *buf, const uint8_t *src, int size, int lowercase); |
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67 | |||
68 | /** |
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69 | * Parse a string of hexadecimal strings. Any space between the hexadecimal |
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70 | * digits is ignored. |
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71 | * |
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72 | * @param data if non-null, the parsed data is written to this pointer |
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73 | * @param p the string to parse |
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74 | * @return the number of bytes written (or to be written, if data is null) |
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75 | */ |
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76 | int ff_hex_to_data(uint8_t *data, const char *p); |
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77 | |||
78 | void ff_program_add_stream_index(AVFormatContext *ac, int progid, unsigned int idx); |
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79 | |||
80 | /** |
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81 | * Add packet to AVFormatContext->packet_buffer list, determining its |
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82 | * interleaved position using compare() function argument. |
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83 | * @return 0, or < 0 on error |
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84 | */ |
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85 | int ff_interleave_add_packet(AVFormatContext *s, AVPacket *pkt, |
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86 | int (*compare)(AVFormatContext *, AVPacket *, AVPacket *)); |
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87 | |||
88 | void ff_read_frame_flush(AVFormatContext *s); |
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89 | |||
90 | #define NTP_OFFSET 2208988800ULL |
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91 | #define NTP_OFFSET_US (NTP_OFFSET * 1000000ULL) |
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92 | |||
93 | /** Get the current time since NTP epoch in microseconds. */ |
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94 | uint64_t ff_ntp_time(void); |
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95 | |||
96 | /** |
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97 | * Append the media-specific SDP fragment for the media stream c |
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98 | * to the buffer buff. |
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99 | * |
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100 | * Note, the buffer needs to be initialized, since it is appended to |
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101 | * existing content. |
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102 | * |
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103 | * @param buff the buffer to append the SDP fragment to |
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104 | * @param size the size of the buff buffer |
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105 | * @param st the AVStream of the media to describe |
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106 | * @param idx the global stream index |
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107 | * @param dest_addr the destination address of the media stream, may be NULL |
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108 | * @param dest_type the destination address type, may be NULL |
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109 | * @param port the destination port of the media stream, 0 if unknown |
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110 | * @param ttl the time to live of the stream, 0 if not multicast |
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111 | * @param fmt the AVFormatContext, which might contain options modifying |
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112 | * the generated SDP |
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113 | */ |
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114 | void ff_sdp_write_media(char *buff, int size, AVStream *st, int idx, |
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115 | const char *dest_addr, const char *dest_type, |
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116 | int port, int ttl, AVFormatContext *fmt); |
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117 | |||
118 | /** |
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119 | * Write a packet to another muxer than the one the user originally |
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120 | * intended. Useful when chaining muxers, where one muxer internally |
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121 | * writes a received packet to another muxer. |
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122 | * |
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123 | * @param dst the muxer to write the packet to |
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124 | * @param dst_stream the stream index within dst to write the packet to |
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125 | * @param pkt the packet to be written |
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126 | * @param src the muxer the packet originally was intended for |
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127 | * @return the value av_write_frame returned |
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128 | */ |
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129 | int ff_write_chained(AVFormatContext *dst, int dst_stream, AVPacket *pkt, |
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130 | AVFormatContext *src); |
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131 | |||
132 | /** |
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133 | * Get the length in bytes which is needed to store val as v. |
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134 | */ |
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135 | int ff_get_v_length(uint64_t val); |
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136 | |||
137 | /** |
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138 | * Put val using a variable number of bytes. |
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139 | */ |
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140 | void ff_put_v(AVIOContext *bc, uint64_t val); |
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141 | |||
142 | /** |
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143 | * Read a whole line of text from AVIOContext. Stop reading after reaching |
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144 | * either a \\n, a \\0 or EOF. The returned string is always \\0-terminated, |
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145 | * and may be truncated if the buffer is too small. |
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146 | * |
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147 | * @param s the read-only AVIOContext |
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148 | * @param buf buffer to store the read line |
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149 | * @param maxlen size of the buffer |
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150 | * @return the length of the string written in the buffer, not including the |
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151 | * final \\0 |
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152 | */ |
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153 | int ff_get_line(AVIOContext *s, char *buf, int maxlen); |
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154 | |||
155 | #define SPACE_CHARS " \t\r\n" |
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156 | |||
157 | /** |
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158 | * Callback function type for ff_parse_key_value. |
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159 | * |
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160 | * @param key a pointer to the key |
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161 | * @param key_len the number of bytes that belong to the key, including the '=' |
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162 | * char |
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163 | * @param dest return the destination pointer for the value in *dest, may |
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164 | * be null to ignore the value |
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165 | * @param dest_len the length of the *dest buffer |
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166 | */ |
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167 | typedef void (*ff_parse_key_val_cb)(void *context, const char *key, |
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168 | int key_len, char **dest, int *dest_len); |
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169 | /** |
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170 | * Parse a string with comma-separated key=value pairs. The value strings |
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171 | * may be quoted and may contain escaped characters within quoted strings. |
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172 | * |
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173 | * @param str the string to parse |
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174 | * @param callback_get_buf function that returns where to store the |
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175 | * unescaped value string. |
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176 | * @param context the opaque context pointer to pass to callback_get_buf |
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177 | */ |
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178 | void ff_parse_key_value(const char *str, ff_parse_key_val_cb callback_get_buf, |
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179 | void *context); |
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180 | |||
181 | /** |
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182 | * Find stream index based on format-specific stream ID |
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183 | * @return stream index, or < 0 on error |
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184 | */ |
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185 | int ff_find_stream_index(AVFormatContext *s, int id); |
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186 | |||
187 | /** |
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188 | * Internal version of av_index_search_timestamp |
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189 | */ |
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190 | int ff_index_search_timestamp(const AVIndexEntry *entries, int nb_entries, |
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191 | int64_t wanted_timestamp, int flags); |
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192 | |||
193 | /** |
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194 | * Internal version of av_add_index_entry |
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195 | */ |
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196 | int ff_add_index_entry(AVIndexEntry **index_entries, |
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197 | int *nb_index_entries, |
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198 | unsigned int *index_entries_allocated_size, |
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199 | int64_t pos, int64_t timestamp, int size, int distance, int flags); |
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200 | |||
201 | /** |
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202 | * Add a new chapter. |
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203 | * |
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204 | * @param s media file handle |
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205 | * @param id unique ID for this chapter |
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206 | * @param start chapter start time in time_base units |
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207 | * @param end chapter end time in time_base units |
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208 | * @param title chapter title |
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209 | * |
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210 | * @return AVChapter or NULL on error |
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211 | */ |
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212 | AVChapter *avpriv_new_chapter(AVFormatContext *s, int id, AVRational time_base, |
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213 | int64_t start, int64_t end, const char *title); |
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214 | |||
215 | /** |
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216 | * Ensure the index uses less memory than the maximum specified in |
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217 | * AVFormatContext.max_index_size by discarding entries if it grows |
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218 | * too large. |
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219 | */ |
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220 | void ff_reduce_index(AVFormatContext *s, int stream_index); |
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221 | |||
222 | enum AVCodecID ff_guess_image2_codec(const char *filename); |
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223 | |||
224 | /** |
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225 | * Convert a date string in ISO8601 format to Unix timestamp. |
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226 | */ |
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227 | int64_t ff_iso8601_to_unix_time(const char *datestr); |
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228 | |||
229 | /** |
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230 | * Perform a binary search using av_index_search_timestamp() and |
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231 | * AVInputFormat.read_timestamp(). |
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232 | * |
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233 | * @param target_ts target timestamp in the time base of the given stream |
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234 | * @param stream_index stream number |
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235 | */ |
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236 | int ff_seek_frame_binary(AVFormatContext *s, int stream_index, |
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237 | int64_t target_ts, int flags); |
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238 | |||
239 | /** |
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240 | * Update cur_dts of all streams based on the given timestamp and AVStream. |
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241 | * |
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242 | * Stream ref_st unchanged, others set cur_dts in their native time base. |
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243 | * Only needed for timestamp wrapping or if (dts not set and pts!=dts). |
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244 | * @param timestamp new dts expressed in time_base of param ref_st |
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245 | * @param ref_st reference stream giving time_base of param timestamp |
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246 | */ |
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247 | void ff_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp); |
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248 | |||
249 | int ff_find_last_ts(AVFormatContext *s, int stream_index, int64_t *ts, int64_t *pos, |
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250 | int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t )); |
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251 | |||
252 | /** |
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253 | * Perform a binary search using read_timestamp(). |
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254 | * |
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255 | * @param target_ts target timestamp in the time base of the given stream |
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256 | * @param stream_index stream number |
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257 | */ |
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258 | int64_t ff_gen_search(AVFormatContext *s, int stream_index, |
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259 | int64_t target_ts, int64_t pos_min, |
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260 | int64_t pos_max, int64_t pos_limit, |
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261 | int64_t ts_min, int64_t ts_max, |
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262 | int flags, int64_t *ts_ret, |
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263 | int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t )); |
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264 | |||
265 | /** |
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266 | * Set the time base and wrapping info for a given stream. This will be used |
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267 | * to interpret the stream's timestamps. If the new time base is invalid |
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268 | * (numerator or denominator are non-positive), it leaves the stream |
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269 | * unchanged. |
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270 | * |
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271 | * @param s stream |
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272 | * @param pts_wrap_bits number of bits effectively used by the pts |
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273 | * (used for wrap control) |
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274 | * @param pts_num time base numerator |
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275 | * @param pts_den time base denominator |
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276 | */ |
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277 | void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, |
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278 | unsigned int pts_num, unsigned int pts_den); |
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279 | |||
280 | /** |
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281 | * Add side data to a packet for changing parameters to the given values. |
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282 | * Parameters set to 0 aren't included in the change. |
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283 | */ |
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284 | int ff_add_param_change(AVPacket *pkt, int32_t channels, |
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285 | uint64_t channel_layout, int32_t sample_rate, |
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286 | int32_t width, int32_t height); |
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287 | |||
288 | /** |
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289 | * Set the timebase for each stream from the corresponding codec timebase and |
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290 | * print it. |
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291 | */ |
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292 | int ff_framehash_write_header(AVFormatContext *s); |
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293 | |||
294 | /** |
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295 | * Read a transport packet from a media file. |
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296 | * |
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297 | * @param s media file handle |
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298 | * @param pkt is filled |
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299 | * @return 0 if OK, AVERROR_xxx on error |
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300 | */ |
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301 | int ff_read_packet(AVFormatContext *s, AVPacket *pkt); |
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302 | |||
303 | /** |
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304 | * Interleave a packet per dts in an output media file. |
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305 | * |
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306 | * Packets with pkt->destruct == av_destruct_packet will be freed inside this |
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307 | * function, so they cannot be used after it. Note that calling av_free_packet() |
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308 | * on them is still safe. |
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309 | * |
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310 | * @param s media file handle |
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311 | * @param out the interleaved packet will be output here |
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312 | * @param pkt the input packet |
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313 | * @param flush 1 if no further packets are available as input and all |
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314 | * remaining packets should be output |
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315 | * @return 1 if a packet was output, 0 if no packet could be output, |
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316 | * < 0 if an error occurred |
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317 | */ |
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318 | int ff_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out, |
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319 | AVPacket *pkt, int flush); |
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320 | |||
321 | void ff_free_stream(AVFormatContext *s, AVStream *st); |
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322 | |||
323 | /** |
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324 | * Return the frame duration in seconds. Return 0 if not available. |
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325 | */ |
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326 | void ff_compute_frame_duration(int *pnum, int *pden, AVStream *st, |
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327 | AVCodecParserContext *pc, AVPacket *pkt); |
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328 | |||
329 | int ff_get_audio_frame_size(AVCodecContext *enc, int size, int mux); |
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330 | |||
331 | unsigned int ff_codec_get_tag(const AVCodecTag *tags, enum AVCodecID id); |
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332 | |||
333 | enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag); |
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334 | |||
335 | /** |
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336 | * Select a PCM codec based on the given parameters. |
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337 | * |
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338 | * @param bps bits-per-sample |
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339 | * @param flt floating-point |
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340 | * @param be big-endian |
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341 | * @param sflags signed flags. each bit corresponds to one byte of bit depth. |
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342 | * e.g. the 1st bit indicates if 8-bit should be signed or |
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343 | * unsigned, the 2nd bit indicates if 16-bit should be signed or |
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344 | * unsigned, etc... This is useful for formats such as WAVE where |
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345 | * only 8-bit is unsigned and all other bit depths are signed. |
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346 | * @return a PCM codec id or AV_CODEC_ID_NONE |
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347 | */ |
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348 | enum AVCodecID ff_get_pcm_codec_id(int bps, int flt, int be, int sflags); |
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349 | |||
350 | /** |
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351 | * Chooses a timebase for muxing the specified stream. |
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352 | * |
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353 | * The choosen timebase allows sample accurate timestamps based |
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354 | * on the framerate or sample rate for audio streams. It also is |
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355 | * at least as precisse as 1/min_precission would be. |
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356 | */ |
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357 | AVRational ff_choose_timebase(AVFormatContext *s, AVStream *st, int min_precission); |
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358 | |||
359 | /** |
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360 | * Generate standard extradata for AVC-Intra based on width/height and field order. |
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361 | */ |
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362 | void ff_generate_avci_extradata(AVStream *st); |
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363 | |||
364 | /** |
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365 | * Allocate extradata with additional FF_INPUT_BUFFER_PADDING_SIZE at end |
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366 | * which is always set to 0. |
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367 | * |
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368 | * @param size size of extradata |
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369 | * @return 0 if OK, AVERROR_xxx on error |
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370 | */ |
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371 | int ff_alloc_extradata(AVCodecContext *avctx, int size); |
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372 | |||
373 | #endif /* AVFORMAT_INTERNAL_H */>>>20) |