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Rev | Author | Line No. | Line |
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6148 | serge | 1 | /* |
2 | * Xiph RTP Protocols |
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3 | * Copyright (c) 2009 Colin McQuillian |
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4 | * Copyright (c) 2010 Josh Allmann |
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5 | * |
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6 | * This file is part of FFmpeg. |
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7 | * |
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8 | * FFmpeg is free software; you can redistribute it and/or |
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9 | * modify it under the terms of the GNU Lesser General Public |
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10 | * License as published by the Free Software Foundation; either |
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11 | * version 2.1 of the License, or (at your option) any later version. |
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12 | * |
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13 | * FFmpeg is distributed in the hope that it will be useful, |
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14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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16 | * Lesser General Public License for more details. |
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17 | * |
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18 | * You should have received a copy of the GNU Lesser General Public |
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19 | * License along with FFmpeg; if not, write to the Free Software |
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20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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21 | */ |
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22 | |||
23 | /** |
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24 | * @file |
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25 | * @brief Xiph / RTP Code |
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26 | * @author Colin McQuillan |
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27 | * @author Josh Allmann |
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28 | */ |
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29 | |||
30 | #include "libavutil/attributes.h" |
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31 | #include "libavutil/avassert.h" |
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32 | #include "libavutil/avstring.h" |
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33 | #include "libavutil/base64.h" |
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34 | #include "libavcodec/bytestream.h" |
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35 | |||
36 | #include "internal.h" |
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37 | #include "rtpdec.h" |
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38 | #include "rtpdec_formats.h" |
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39 | |||
40 | /** |
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41 | * RTP/Xiph specific private data. |
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42 | */ |
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43 | struct PayloadContext { |
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44 | unsigned ident; ///< 24-bit stream configuration identifier |
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45 | uint32_t timestamp; |
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46 | AVIOContext* fragment; ///< buffer for split payloads |
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47 | uint8_t *split_buf; |
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48 | int split_pos, split_buf_len, split_buf_size; |
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49 | int split_pkts; |
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50 | }; |
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51 | |||
52 | static PayloadContext *xiph_new_context(void) |
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53 | { |
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54 | return av_mallocz(sizeof(PayloadContext)); |
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55 | } |
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56 | |||
57 | static inline void free_fragment_if_needed(PayloadContext * data) |
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58 | { |
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59 | if (data->fragment) { |
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60 | uint8_t* p; |
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61 | avio_close_dyn_buf(data->fragment, &p); |
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62 | av_free(p); |
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63 | data->fragment = NULL; |
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64 | } |
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65 | } |
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66 | |||
67 | static void xiph_free_context(PayloadContext * data) |
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68 | { |
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69 | free_fragment_if_needed(data); |
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70 | av_free(data->split_buf); |
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71 | av_free(data); |
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72 | } |
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73 | |||
74 | static av_cold int xiph_vorbis_init(AVFormatContext *ctx, int st_index, |
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75 | PayloadContext *data) |
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76 | { |
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77 | if (st_index < 0) |
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78 | return 0; |
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79 | ctx->streams[st_index]->need_parsing = AVSTREAM_PARSE_HEADERS; |
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80 | return 0; |
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81 | } |
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82 | |||
83 | |||
84 | static int xiph_handle_packet(AVFormatContext *ctx, PayloadContext *data, |
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85 | AVStream *st, AVPacket *pkt, uint32_t *timestamp, |
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86 | const uint8_t *buf, int len, uint16_t seq, |
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87 | int flags) |
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88 | { |
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89 | |||
90 | int ident, fragmented, tdt, num_pkts, pkt_len; |
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91 | |||
92 | if (!buf) { |
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93 | if (!data->split_buf || data->split_pos + 2 > data->split_buf_len || |
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94 | data->split_pkts <= 0) { |
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95 | av_log(ctx, AV_LOG_ERROR, "No more data to return\n"); |
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96 | return AVERROR_INVALIDDATA; |
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97 | } |
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98 | pkt_len = AV_RB16(data->split_buf + data->split_pos); |
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99 | data->split_pos += 2; |
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100 | if (data->split_pos + pkt_len > data->split_buf_len) { |
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101 | av_log(ctx, AV_LOG_ERROR, "Not enough data to return\n"); |
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102 | return AVERROR_INVALIDDATA; |
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103 | } |
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104 | if (av_new_packet(pkt, pkt_len)) { |
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105 | av_log(ctx, AV_LOG_ERROR, "Out of memory.\n"); |
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106 | return AVERROR(ENOMEM); |
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107 | } |
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108 | pkt->stream_index = st->index; |
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109 | memcpy(pkt->data, data->split_buf + data->split_pos, pkt_len); |
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110 | data->split_pos += pkt_len; |
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111 | data->split_pkts--; |
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112 | return data->split_pkts > 0; |
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113 | } |
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114 | |||
115 | if (len < 6) { |
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116 | av_log(ctx, AV_LOG_ERROR, "Invalid %d byte packet\n", len); |
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117 | return AVERROR_INVALIDDATA; |
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118 | } |
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119 | |||
120 | // read xiph rtp headers |
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121 | ident = AV_RB24(buf); |
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122 | fragmented = buf[3] >> 6; |
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123 | tdt = (buf[3] >> 4) & 3; |
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124 | num_pkts = buf[3] & 0xf; |
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125 | pkt_len = AV_RB16(buf + 4); |
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126 | |||
127 | if (pkt_len > len - 6) { |
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128 | av_log(ctx, AV_LOG_ERROR, |
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129 | "Invalid packet length %d in %d byte packet\n", pkt_len, |
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130 | len); |
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131 | return AVERROR_INVALIDDATA; |
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132 | } |
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133 | |||
134 | if (ident != data->ident) { |
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135 | av_log(ctx, AV_LOG_ERROR, |
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136 | "Unimplemented Xiph SDP configuration change detected\n"); |
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137 | return AVERROR_PATCHWELCOME; |
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138 | } |
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139 | |||
140 | if (tdt) { |
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141 | av_log(ctx, AV_LOG_ERROR, |
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142 | "Unimplemented RTP Xiph packet settings (%d,%d,%d)\n", |
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143 | fragmented, tdt, num_pkts); |
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144 | return AVERROR_PATCHWELCOME; |
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145 | } |
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146 | |||
147 | buf += 6; // move past header bits |
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148 | len -= 6; |
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149 | |||
150 | if (fragmented == 0) { |
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151 | if (av_new_packet(pkt, pkt_len)) { |
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152 | av_log(ctx, AV_LOG_ERROR, "Out of memory.\n"); |
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153 | return AVERROR(ENOMEM); |
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154 | } |
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155 | pkt->stream_index = st->index; |
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156 | memcpy(pkt->data, buf, pkt_len); |
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157 | buf += pkt_len; |
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158 | len -= pkt_len; |
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159 | num_pkts--; |
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160 | |||
161 | if (num_pkts > 0) { |
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162 | if (len > data->split_buf_size || !data->split_buf) { |
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163 | av_freep(&data->split_buf); |
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164 | data->split_buf_size = 2 * len; |
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165 | data->split_buf = av_malloc(data->split_buf_size); |
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166 | if (!data->split_buf) { |
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167 | av_log(ctx, AV_LOG_ERROR, "Out of memory.\n"); |
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168 | av_free_packet(pkt); |
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169 | return AVERROR(ENOMEM); |
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170 | } |
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171 | } |
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172 | memcpy(data->split_buf, buf, len); |
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173 | data->split_buf_len = len; |
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174 | data->split_pos = 0; |
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175 | data->split_pkts = num_pkts; |
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176 | return 1; |
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177 | } |
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178 | |||
179 | return 0; |
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180 | |||
181 | } else if (fragmented == 1) { |
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182 | // start of xiph data fragment |
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183 | int res; |
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184 | |||
185 | // end packet has been lost somewhere, so drop buffered data |
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186 | free_fragment_if_needed(data); |
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187 | |||
188 | if((res = avio_open_dyn_buf(&data->fragment)) < 0) |
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189 | return res; |
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190 | |||
191 | avio_write(data->fragment, buf, pkt_len); |
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192 | data->timestamp = *timestamp; |
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193 | |||
194 | } else { |
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195 | av_assert1(fragmented < 4); |
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196 | if (data->timestamp != *timestamp) { |
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197 | // skip if fragmented timestamp is incorrect; |
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198 | // a start packet has been lost somewhere |
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199 | free_fragment_if_needed(data); |
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200 | av_log(ctx, AV_LOG_ERROR, "RTP timestamps don't match!\n"); |
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201 | return AVERROR_INVALIDDATA; |
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202 | } |
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203 | if (!data->fragment) { |
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204 | av_log(ctx, AV_LOG_WARNING, |
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205 | "Received packet without a start fragment; dropping.\n"); |
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206 | return AVERROR(EAGAIN); |
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207 | } |
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208 | |||
209 | // copy data to fragment buffer |
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210 | avio_write(data->fragment, buf, pkt_len); |
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211 | |||
212 | if (fragmented == 3) { |
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213 | // end of xiph data packet |
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214 | int ret = ff_rtp_finalize_packet(pkt, &data->fragment, st->index); |
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215 | if (ret < 0) { |
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216 | av_log(ctx, AV_LOG_ERROR, |
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217 | "Error occurred when getting fragment buffer."); |
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218 | return ret; |
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219 | } |
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220 | |||
221 | return 0; |
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222 | } |
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223 | } |
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224 | |||
225 | return AVERROR(EAGAIN); |
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226 | } |
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227 | |||
228 | /** |
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229 | * Length encoding described in RFC5215 section 3.1.1. |
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230 | */ |
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231 | static int get_base128(const uint8_t ** buf, const uint8_t * buf_end) |
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232 | { |
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233 | int n = 0; |
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234 | for (; *buf < buf_end; ++*buf) { |
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235 | n <<= 7; |
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236 | n += **buf & 0x7f; |
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237 | if (!(**buf & 0x80)) { |
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238 | ++*buf; |
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239 | return n; |
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240 | } |
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241 | } |
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242 | return 0; |
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243 | } |
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244 | |||
245 | /** |
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246 | * Based off parse_packed_headers in Vorbis RTP |
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247 | */ |
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248 | static int |
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249 | parse_packed_headers(const uint8_t * packed_headers, |
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250 | const uint8_t * packed_headers_end, |
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251 | AVCodecContext * codec, PayloadContext * xiph_data) |
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252 | { |
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253 | |||
254 | unsigned num_packed, num_headers, length, length1, length2, extradata_alloc; |
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255 | uint8_t *ptr; |
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256 | |||
257 | if (packed_headers_end - packed_headers < 9) { |
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258 | av_log(codec, AV_LOG_ERROR, |
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259 | "Invalid %td byte packed header.", |
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260 | packed_headers_end - packed_headers); |
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261 | return AVERROR_INVALIDDATA; |
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262 | } |
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263 | |||
264 | num_packed = bytestream_get_be32(&packed_headers); |
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265 | xiph_data->ident = bytestream_get_be24(&packed_headers); |
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266 | length = bytestream_get_be16(&packed_headers); |
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267 | num_headers = get_base128(&packed_headers, packed_headers_end); |
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268 | length1 = get_base128(&packed_headers, packed_headers_end); |
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269 | length2 = get_base128(&packed_headers, packed_headers_end); |
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270 | |||
271 | if (num_packed != 1 || num_headers > 3) { |
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272 | av_log(codec, AV_LOG_ERROR, |
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273 | "Unimplemented number of headers: %d packed headers, %d headers\n", |
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274 | num_packed, num_headers); |
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275 | return AVERROR_PATCHWELCOME; |
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276 | } |
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277 | |||
278 | if (packed_headers_end - packed_headers != length || |
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279 | length1 > length || length2 > length - length1) { |
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280 | av_log(codec, AV_LOG_ERROR, |
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281 | "Bad packed header lengths (%d,%d,%td,%d)\n", length1, |
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282 | length2, packed_headers_end - packed_headers, length); |
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283 | return AVERROR_INVALIDDATA; |
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284 | } |
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285 | |||
286 | /* allocate extra space: |
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287 | * -- length/255 +2 for xiphlacing |
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288 | * -- one for the '2' marker |
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289 | * -- FF_INPUT_BUFFER_PADDING_SIZE required */ |
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290 | extradata_alloc = length + length/255 + 3 + FF_INPUT_BUFFER_PADDING_SIZE; |
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291 | |||
292 | if (ff_alloc_extradata(codec, extradata_alloc)) { |
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293 | av_log(codec, AV_LOG_ERROR, "Out of memory\n"); |
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294 | return AVERROR(ENOMEM); |
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295 | } |
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296 | ptr = codec->extradata; |
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297 | *ptr++ = 2; |
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298 | ptr += av_xiphlacing(ptr, length1); |
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299 | ptr += av_xiphlacing(ptr, length2); |
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300 | memcpy(ptr, packed_headers, length); |
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301 | ptr += length; |
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302 | codec->extradata_size = ptr - codec->extradata; |
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303 | // clear out remaining parts of the buffer |
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304 | memset(ptr, 0, extradata_alloc - codec->extradata_size); |
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305 | |||
306 | return 0; |
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307 | } |
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308 | |||
309 | static int xiph_parse_fmtp_pair(AVStream* stream, |
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310 | PayloadContext *xiph_data, |
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311 | char *attr, char *value) |
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312 | { |
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313 | AVCodecContext *codec = stream->codec; |
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314 | int result = 0; |
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315 | |||
316 | if (!strcmp(attr, "sampling")) { |
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317 | if (!strcmp(value, "YCbCr-4:2:0")) { |
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318 | codec->pix_fmt = AV_PIX_FMT_YUV420P; |
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319 | } else if (!strcmp(value, "YCbCr-4:4:2")) { |
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320 | codec->pix_fmt = AV_PIX_FMT_YUV422P; |
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321 | } else if (!strcmp(value, "YCbCr-4:4:4")) { |
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322 | codec->pix_fmt = AV_PIX_FMT_YUV444P; |
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323 | } else { |
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324 | av_log(codec, AV_LOG_ERROR, |
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325 | "Unsupported pixel format %s\n", attr); |
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326 | return AVERROR_INVALIDDATA; |
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327 | } |
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328 | } else if (!strcmp(attr, "width")) { |
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329 | /* This is an integer between 1 and 1048561 |
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330 | * and MUST be in multiples of 16. */ |
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331 | codec->width = atoi(value); |
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332 | return 0; |
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333 | } else if (!strcmp(attr, "height")) { |
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334 | /* This is an integer between 1 and 1048561 |
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335 | * and MUST be in multiples of 16. */ |
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336 | codec->height = atoi(value); |
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337 | return 0; |
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338 | } else if (!strcmp(attr, "delivery-method")) { |
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339 | /* Possible values are: inline, in_band, out_band/specific_name. */ |
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340 | return AVERROR_PATCHWELCOME; |
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341 | } else if (!strcmp(attr, "configuration-uri")) { |
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342 | /* NOTE: configuration-uri is supported only under 2 conditions: |
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343 | *--after the delivery-method tag |
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344 | * --with a delivery-method value of out_band */ |
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345 | return AVERROR_PATCHWELCOME; |
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346 | } else if (!strcmp(attr, "configuration")) { |
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347 | /* NOTE: configuration is supported only AFTER the delivery-method tag |
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348 | * The configuration value is a base64 encoded packed header */ |
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349 | uint8_t *decoded_packet = NULL; |
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350 | int packet_size; |
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351 | size_t decoded_alloc = strlen(value) / 4 * 3 + 4; |
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352 | |||
353 | if (decoded_alloc <= INT_MAX) { |
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354 | decoded_packet = av_malloc(decoded_alloc); |
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355 | if (decoded_packet) { |
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356 | packet_size = |
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357 | av_base64_decode(decoded_packet, value, decoded_alloc); |
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358 | |||
359 | result = parse_packed_headers |
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360 | (decoded_packet, decoded_packet + packet_size, codec, |
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361 | xiph_data); |
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362 | } else { |
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363 | av_log(codec, AV_LOG_ERROR, |
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364 | "Out of memory while decoding SDP configuration.\n"); |
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365 | result = AVERROR(ENOMEM); |
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366 | } |
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367 | } else { |
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368 | av_log(codec, AV_LOG_ERROR, "Packet too large\n"); |
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369 | result = AVERROR_INVALIDDATA; |
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370 | } |
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371 | av_free(decoded_packet); |
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372 | } |
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373 | return result; |
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374 | } |
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375 | |||
376 | static int xiph_parse_sdp_line(AVFormatContext *s, int st_index, |
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377 | PayloadContext *data, const char *line) |
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378 | { |
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379 | const char *p; |
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380 | |||
381 | if (st_index < 0) |
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382 | return 0; |
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383 | |||
384 | if (av_strstart(line, "fmtp:", &p)) { |
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385 | return ff_parse_fmtp(s->streams[st_index], data, p, |
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386 | xiph_parse_fmtp_pair); |
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387 | } |
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388 | |||
389 | return 0; |
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390 | } |
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391 | |||
392 | RTPDynamicProtocolHandler ff_theora_dynamic_handler = { |
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393 | .enc_name = "theora", |
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394 | .codec_type = AVMEDIA_TYPE_VIDEO, |
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395 | .codec_id = AV_CODEC_ID_THEORA, |
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396 | .parse_sdp_a_line = xiph_parse_sdp_line, |
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397 | .alloc = xiph_new_context, |
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398 | .free = xiph_free_context, |
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399 | .parse_packet = xiph_handle_packet |
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400 | }; |
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401 | |||
402 | RTPDynamicProtocolHandler ff_vorbis_dynamic_handler = { |
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403 | .enc_name = "vorbis", |
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404 | .codec_type = AVMEDIA_TYPE_AUDIO, |
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405 | .codec_id = AV_CODEC_ID_VORBIS, |
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406 | .init = xiph_vorbis_init, |
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407 | .parse_sdp_a_line = xiph_parse_sdp_line, |
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408 | .alloc = xiph_new_context, |
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409 | .free = xiph_free_context, |
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410 | .parse_packet = xiph_handle_packet |
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411 | };>=>>=><=>>>>>>=>>>> |