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4349 | Serge | 1 | /* |
2 | * Microsoft RTP/ASF support. |
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3 | * Copyright (c) 2008 Ronald S. Bultje |
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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 | /** |
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23 | * @file |
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24 | * @brief Microsoft RTP/ASF support |
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25 | * @author Ronald S. Bultje |
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26 | */ |
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27 | |||
28 | #include "libavutil/base64.h" |
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29 | #include "libavutil/avstring.h" |
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30 | #include "libavutil/intreadwrite.h" |
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31 | #include "rtp.h" |
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32 | #include "rtpdec_formats.h" |
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33 | #include "rtsp.h" |
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34 | #include "asf.h" |
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35 | #include "avio_internal.h" |
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36 | #include "internal.h" |
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37 | |||
38 | /** |
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39 | * From MSDN 2.2.1.4, we learn that ASF data packets over RTP should not |
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40 | * contain any padding. Unfortunately, the header min/max_pktsize are not |
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41 | * updated (thus making min_pktsize invalid). Here, we "fix" these faulty |
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42 | * min_pktsize values in the ASF file header. |
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43 | * @return 0 on success, <0 on failure (currently -1). |
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44 | */ |
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45 | static int rtp_asf_fix_header(uint8_t *buf, int len) |
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46 | { |
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47 | uint8_t *p = buf, *end = buf + len; |
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48 | |||
49 | if (len < sizeof(ff_asf_guid) * 2 + 22 || |
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50 | memcmp(p, ff_asf_header, sizeof(ff_asf_guid))) { |
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51 | return -1; |
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52 | } |
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53 | p += sizeof(ff_asf_guid) + 14; |
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54 | do { |
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55 | uint64_t chunksize = AV_RL64(p + sizeof(ff_asf_guid)); |
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56 | if (memcmp(p, ff_asf_file_header, sizeof(ff_asf_guid))) { |
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57 | if (chunksize > end - p) |
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58 | return -1; |
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59 | p += chunksize; |
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60 | continue; |
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61 | } |
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62 | |||
63 | /* skip most of the file header, to min_pktsize */ |
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64 | p += 6 * 8 + 3 * 4 + sizeof(ff_asf_guid) * 2; |
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65 | if (p + 8 <= end && AV_RL32(p) == AV_RL32(p + 4)) { |
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66 | /* and set that to zero */ |
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67 | AV_WL32(p, 0); |
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68 | return 0; |
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69 | } |
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70 | break; |
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71 | } while (end - p >= sizeof(ff_asf_guid) + 8); |
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72 | |||
73 | return -1; |
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74 | } |
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75 | |||
76 | /** |
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77 | * The following code is basically a buffered AVIOContext, |
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78 | * with the added benefit of returning -EAGAIN (instead of 0) |
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79 | * on packet boundaries, such that the ASF demuxer can return |
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80 | * safely and resume business at the next packet. |
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81 | */ |
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82 | static int packetizer_read(void *opaque, uint8_t *buf, int buf_size) |
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83 | { |
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84 | return AVERROR(EAGAIN); |
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85 | } |
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86 | |||
87 | static void init_packetizer(AVIOContext *pb, uint8_t *buf, int len) |
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88 | { |
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89 | ffio_init_context(pb, buf, len, 0, NULL, packetizer_read, NULL, NULL); |
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90 | |||
91 | /* this "fills" the buffer with its current content */ |
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92 | pb->pos = len; |
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93 | pb->buf_end = buf + len; |
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94 | } |
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95 | |||
96 | int ff_wms_parse_sdp_a_line(AVFormatContext *s, const char *p) |
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97 | { |
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98 | int ret = 0; |
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99 | if (av_strstart(p, "pgmpu:data:application/vnd.ms.wms-hdr.asfv1;base64,", &p)) { |
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100 | AVIOContext pb; |
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101 | RTSPState *rt = s->priv_data; |
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102 | AVDictionary *opts = NULL; |
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103 | int len = strlen(p) * 6 / 8; |
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104 | char *buf = av_mallocz(len); |
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105 | av_base64_decode(buf, p, len); |
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106 | |||
107 | if (rtp_asf_fix_header(buf, len) < 0) |
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108 | av_log(s, AV_LOG_ERROR, |
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109 | "Failed to fix invalid RTSP-MS/ASF min_pktsize\n"); |
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110 | init_packetizer(&pb, buf, len); |
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111 | if (rt->asf_ctx) { |
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112 | avformat_close_input(&rt->asf_ctx); |
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113 | } |
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114 | if (!(rt->asf_ctx = avformat_alloc_context())) |
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115 | return AVERROR(ENOMEM); |
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116 | rt->asf_ctx->pb = &pb; |
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117 | av_dict_set(&opts, "no_resync_search", "1", 0); |
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118 | ret = avformat_open_input(&rt->asf_ctx, "", &ff_asf_demuxer, &opts); |
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119 | av_dict_free(&opts); |
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120 | if (ret < 0) |
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121 | return ret; |
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122 | av_dict_copy(&s->metadata, rt->asf_ctx->metadata, 0); |
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123 | rt->asf_pb_pos = avio_tell(&pb); |
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124 | av_free(buf); |
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125 | rt->asf_ctx->pb = NULL; |
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126 | } |
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127 | return ret; |
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128 | } |
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129 | |||
130 | static int asfrtp_parse_sdp_line(AVFormatContext *s, int stream_index, |
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131 | PayloadContext *asf, const char *line) |
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132 | { |
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133 | if (stream_index < 0) |
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134 | return 0; |
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135 | if (av_strstart(line, "stream:", &line)) { |
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136 | RTSPState *rt = s->priv_data; |
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137 | |||
138 | s->streams[stream_index]->id = strtol(line, NULL, 10); |
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139 | |||
140 | if (rt->asf_ctx) { |
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141 | int i; |
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142 | |||
143 | for (i = 0; i < rt->asf_ctx->nb_streams; i++) { |
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144 | if (s->streams[stream_index]->id == rt->asf_ctx->streams[i]->id) { |
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145 | *s->streams[stream_index]->codec = |
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146 | *rt->asf_ctx->streams[i]->codec; |
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147 | rt->asf_ctx->streams[i]->codec->extradata_size = 0; |
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148 | rt->asf_ctx->streams[i]->codec->extradata = NULL; |
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149 | avpriv_set_pts_info(s->streams[stream_index], 32, 1, 1000); |
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150 | } |
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151 | } |
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152 | } |
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153 | } |
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154 | |||
155 | return 0; |
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156 | } |
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157 | |||
158 | struct PayloadContext { |
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159 | AVIOContext *pktbuf, pb; |
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160 | uint8_t *buf; |
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161 | }; |
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162 | |||
163 | /** |
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164 | * @return 0 when a packet was written into /p pkt, and no more data is left; |
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165 | * 1 when a packet was written into /p pkt, and more packets might be left; |
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166 | * <0 when not enough data was provided to return a full packet, or on error. |
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167 | */ |
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168 | static int asfrtp_parse_packet(AVFormatContext *s, PayloadContext *asf, |
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169 | AVStream *st, AVPacket *pkt, |
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170 | uint32_t *timestamp, |
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171 | const uint8_t *buf, int len, uint16_t seq, |
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172 | int flags) |
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173 | { |
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174 | AVIOContext *pb = &asf->pb; |
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175 | int res, mflags, len_off; |
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176 | RTSPState *rt = s->priv_data; |
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177 | |||
178 | if (!rt->asf_ctx) |
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179 | return -1; |
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180 | |||
181 | if (len > 0) { |
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182 | int off, out_len = 0; |
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183 | |||
184 | if (len < 4) |
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185 | return -1; |
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186 | |||
187 | av_freep(&asf->buf); |
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188 | |||
189 | ffio_init_context(pb, buf, len, 0, NULL, NULL, NULL, NULL); |
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190 | |||
191 | while (avio_tell(pb) + 4 < len) { |
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192 | int start_off = avio_tell(pb); |
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193 | |||
194 | mflags = avio_r8(pb); |
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195 | if (mflags & 0x80) |
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196 | flags |= RTP_FLAG_KEY; |
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197 | len_off = avio_rb24(pb); |
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198 | if (mflags & 0x20) /**< relative timestamp */ |
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199 | avio_skip(pb, 4); |
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200 | if (mflags & 0x10) /**< has duration */ |
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201 | avio_skip(pb, 4); |
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202 | if (mflags & 0x8) /**< has location ID */ |
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203 | avio_skip(pb, 4); |
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204 | off = avio_tell(pb); |
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205 | |||
206 | if (!(mflags & 0x40)) { |
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207 | /** |
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208 | * If 0x40 is not set, the len_off field specifies an offset |
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209 | * of this packet's payload data in the complete (reassembled) |
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210 | * ASF packet. This is used to spread one ASF packet over |
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211 | * multiple RTP packets. |
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212 | */ |
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213 | if (asf->pktbuf && len_off != avio_tell(asf->pktbuf)) { |
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214 | uint8_t *p; |
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215 | avio_close_dyn_buf(asf->pktbuf, &p); |
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216 | asf->pktbuf = NULL; |
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217 | av_free(p); |
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218 | } |
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219 | if (!len_off && !asf->pktbuf && |
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220 | (res = avio_open_dyn_buf(&asf->pktbuf)) < 0) |
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221 | return res; |
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222 | if (!asf->pktbuf) |
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223 | return AVERROR(EIO); |
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224 | |||
225 | avio_write(asf->pktbuf, buf + off, len - off); |
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226 | avio_skip(pb, len - off); |
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227 | if (!(flags & RTP_FLAG_MARKER)) |
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228 | return -1; |
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229 | out_len = avio_close_dyn_buf(asf->pktbuf, &asf->buf); |
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230 | asf->pktbuf = NULL; |
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231 | } else { |
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232 | /** |
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233 | * If 0x40 is set, the len_off field specifies the length of |
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234 | * the next ASF packet that can be read from this payload |
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235 | * data alone. This is commonly the same as the payload size, |
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236 | * but could be less in case of packet splitting (i.e. |
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237 | * multiple ASF packets in one RTP packet). |
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238 | */ |
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239 | |||
240 | int cur_len = start_off + len_off - off; |
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241 | int prev_len = out_len; |
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242 | out_len += cur_len; |
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243 | if (FFMIN(cur_len, len - off) < 0) |
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244 | return -1; |
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245 | if ((res = av_reallocp(&asf->buf, out_len)) < 0) |
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246 | return res; |
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247 | memcpy(asf->buf + prev_len, buf + off, |
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248 | FFMIN(cur_len, len - off)); |
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249 | avio_skip(pb, cur_len); |
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250 | } |
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251 | } |
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252 | |||
253 | init_packetizer(pb, asf->buf, out_len); |
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254 | pb->pos += rt->asf_pb_pos; |
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255 | pb->eof_reached = 0; |
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256 | rt->asf_ctx->pb = pb; |
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257 | } |
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258 | |||
259 | for (;;) { |
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260 | int i; |
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261 | |||
262 | res = ff_read_packet(rt->asf_ctx, pkt); |
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263 | rt->asf_pb_pos = avio_tell(pb); |
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264 | if (res != 0) |
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265 | break; |
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266 | for (i = 0; i < s->nb_streams; i++) { |
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267 | if (s->streams[i]->id == rt->asf_ctx->streams[pkt->stream_index]->id) { |
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268 | pkt->stream_index = i; |
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269 | return 1; // FIXME: return 0 if last packet |
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270 | } |
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271 | } |
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272 | av_free_packet(pkt); |
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273 | } |
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274 | |||
275 | return res == 1 ? -1 : res; |
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276 | } |
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277 | |||
278 | static PayloadContext *asfrtp_new_context(void) |
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279 | { |
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280 | return av_mallocz(sizeof(PayloadContext)); |
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281 | } |
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282 | |||
283 | static void asfrtp_free_context(PayloadContext *asf) |
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284 | { |
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285 | if (asf->pktbuf) { |
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286 | uint8_t *p = NULL; |
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287 | avio_close_dyn_buf(asf->pktbuf, &p); |
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288 | asf->pktbuf = NULL; |
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289 | av_free(p); |
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290 | } |
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291 | av_freep(&asf->buf); |
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292 | av_free(asf); |
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293 | } |
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294 | |||
295 | #define RTP_ASF_HANDLER(n, s, t) \ |
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296 | RTPDynamicProtocolHandler ff_ms_rtp_ ## n ## _handler = { \ |
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297 | .enc_name = s, \ |
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298 | .codec_type = t, \ |
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299 | .codec_id = AV_CODEC_ID_NONE, \ |
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300 | .parse_sdp_a_line = asfrtp_parse_sdp_line, \ |
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301 | .alloc = asfrtp_new_context, \ |
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302 | .free = asfrtp_free_context, \ |
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303 | .parse_packet = asfrtp_parse_packet, \ |
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304 | } |
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305 | |||
306 | RTP_ASF_HANDLER(asf_pfv, "x-asf-pf", AVMEDIA_TYPE_VIDEO); |
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307 | RTP_ASF_HANDLER(asf_pfa, "x-asf-pf", AVMEDIA_TYPE_AUDIO);>>>>>>>>>0>>>>>=>>0> |