| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Session Announcement Protocol (RFC 2974) demuxer | ||
| 3 | * Copyright (c) 2010 Martin Storsjo | ||
| 4 | * | ||
| 5 | * This file is part of FFmpeg. | ||
| 6 | * | ||
| 7 | * FFmpeg is free software; you can redistribute it and/or | ||
| 8 | * modify it under the terms of the GNU Lesser General Public | ||
| 9 | * License as published by the Free Software Foundation; either | ||
| 10 | * version 2.1 of the License, or (at your option) any later version. | ||
| 11 | * | ||
| 12 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 15 | * Lesser General Public License for more details. | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU Lesser General Public | ||
| 18 | * License along with FFmpeg; if not, write to the Free Software | ||
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 20 | */ | ||
| 21 | |||
| 22 | #include "avformat.h" | ||
| 23 | #include "demux.h" | ||
| 24 | #include "libavutil/avstring.h" | ||
| 25 | #include "libavutil/intreadwrite.h" | ||
| 26 | #include "libavutil/mem.h" | ||
| 27 | #include "network.h" | ||
| 28 | #include "os_support.h" | ||
| 29 | #include "internal.h" | ||
| 30 | #include "avio_internal.h" | ||
| 31 | #include "url.h" | ||
| 32 | #include "rtpdec.h" | ||
| 33 | #if HAVE_POLL_H | ||
| 34 | #include <poll.h> | ||
| 35 | #endif | ||
| 36 | |||
| 37 | struct SAPState { | ||
| 38 | URLContext *ann_fd; | ||
| 39 | AVFormatContext *sdp_ctx; | ||
| 40 | FFIOContext sdp_pb; | ||
| 41 | uint16_t hash; | ||
| 42 | char *sdp; | ||
| 43 | int eof; | ||
| 44 | }; | ||
| 45 | |||
| 46 | 4296 | static int sap_probe(const AVProbeData *p) | |
| 47 | { | ||
| 48 |
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4296 | if (av_strstart(p->filename, "sap:", NULL)) |
| 49 | ✗ | return AVPROBE_SCORE_MAX; | |
| 50 | 4296 | return 0; | |
| 51 | } | ||
| 52 | |||
| 53 | ✗ | static int sap_read_close(AVFormatContext *s) | |
| 54 | { | ||
| 55 | ✗ | struct SAPState *sap = s->priv_data; | |
| 56 | ✗ | if (sap->sdp_ctx) | |
| 57 | ✗ | avformat_close_input(&sap->sdp_ctx); | |
| 58 | ✗ | ffurl_closep(&sap->ann_fd); | |
| 59 | ✗ | av_freep(&sap->sdp); | |
| 60 | ✗ | ff_network_close(); | |
| 61 | ✗ | return 0; | |
| 62 | } | ||
| 63 | |||
| 64 | ✗ | static int sap_read_header(AVFormatContext *s) | |
| 65 | { | ||
| 66 | ✗ | struct SAPState *sap = s->priv_data; | |
| 67 | char host[1024], path[1024], url[1024]; | ||
| 68 | uint8_t recvbuf[RTP_MAX_PACKET_LENGTH]; | ||
| 69 | const AVInputFormat *infmt; | ||
| 70 | int port; | ||
| 71 | int ret, i; | ||
| 72 | |||
| 73 | ✗ | if ((ret = ff_network_init()) < 0) | |
| 74 | ✗ | return ret; | |
| 75 | |||
| 76 | ✗ | av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port, | |
| 77 | ✗ | path, sizeof(path), s->url); | |
| 78 | ✗ | if (port < 0) | |
| 79 | ✗ | port = 9875; | |
| 80 | |||
| 81 | ✗ | if (!host[0]) { | |
| 82 | /* Listen for announcements on sap.mcast.net if no host was specified */ | ||
| 83 | ✗ | av_strlcpy(host, "224.2.127.254", sizeof(host)); | |
| 84 | } | ||
| 85 | |||
| 86 | ✗ | ff_url_join(url, sizeof(url), "udp", NULL, host, port, "?localport=%d", | |
| 87 | port); | ||
| 88 | ✗ | ret = ffurl_open_whitelist(&sap->ann_fd, url, AVIO_FLAG_READ, | |
| 89 | ✗ | &s->interrupt_callback, NULL, | |
| 90 | ✗ | s->protocol_whitelist, s->protocol_blacklist, NULL); | |
| 91 | ✗ | if (ret) | |
| 92 | ✗ | goto fail; | |
| 93 | |||
| 94 | ✗ | while (1) { | |
| 95 | int addr_type, auth_len; | ||
| 96 | int pos; | ||
| 97 | |||
| 98 | ✗ | ret = ffurl_read(sap->ann_fd, recvbuf, sizeof(recvbuf) - 1); | |
| 99 | ✗ | if (ret == AVERROR(EAGAIN)) | |
| 100 | ✗ | continue; | |
| 101 | ✗ | if (ret < 0) | |
| 102 | ✗ | goto fail; | |
| 103 | ✗ | recvbuf[ret] = '\0'; /* Null terminate for easier parsing */ | |
| 104 | ✗ | if (ret < 8) { | |
| 105 | ✗ | av_log(s, AV_LOG_WARNING, "Received too short packet\n"); | |
| 106 | ✗ | continue; | |
| 107 | } | ||
| 108 | |||
| 109 | ✗ | if ((recvbuf[0] & 0xe0) != 0x20) { | |
| 110 | ✗ | av_log(s, AV_LOG_WARNING, "Unsupported SAP version packet " | |
| 111 | "received\n"); | ||
| 112 | ✗ | continue; | |
| 113 | } | ||
| 114 | |||
| 115 | ✗ | if (recvbuf[0] & 0x04) { | |
| 116 | ✗ | av_log(s, AV_LOG_WARNING, "Received stream deletion " | |
| 117 | "announcement\n"); | ||
| 118 | ✗ | continue; | |
| 119 | } | ||
| 120 | ✗ | addr_type = recvbuf[0] & 0x10; | |
| 121 | ✗ | auth_len = recvbuf[1]; | |
| 122 | ✗ | sap->hash = AV_RB16(&recvbuf[2]); | |
| 123 | ✗ | pos = 4; | |
| 124 | ✗ | if (addr_type) | |
| 125 | ✗ | pos += 16; /* IPv6 */ | |
| 126 | else | ||
| 127 | ✗ | pos += 4; /* IPv4 */ | |
| 128 | ✗ | pos += auth_len * 4; | |
| 129 | ✗ | if (pos + 4 >= ret) { | |
| 130 | ✗ | av_log(s, AV_LOG_WARNING, "Received too short packet\n"); | |
| 131 | ✗ | continue; | |
| 132 | } | ||
| 133 | #define MIME "application/sdp" | ||
| 134 | ✗ | if (strcmp(&recvbuf[pos], MIME) == 0) { | |
| 135 | ✗ | pos += strlen(MIME) + 1; | |
| 136 | ✗ | } else if (strncmp(&recvbuf[pos], "v=0\r\n", 5) == 0) { | |
| 137 | // Direct SDP without a mime type | ||
| 138 | } else { | ||
| 139 | ✗ | av_log(s, AV_LOG_WARNING, "Unsupported mime type %s\n", | |
| 140 | &recvbuf[pos]); | ||
| 141 | ✗ | continue; | |
| 142 | } | ||
| 143 | |||
| 144 | ✗ | sap->sdp = av_strdup(&recvbuf[pos]); | |
| 145 | ✗ | if (!sap->sdp) { | |
| 146 | ✗ | ret = AVERROR(ENOMEM); | |
| 147 | ✗ | goto fail; | |
| 148 | } | ||
| 149 | ✗ | break; | |
| 150 | } | ||
| 151 | |||
| 152 | ✗ | av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", sap->sdp); | |
| 153 | ✗ | ffio_init_read_context(&sap->sdp_pb, sap->sdp, strlen(sap->sdp)); | |
| 154 | |||
| 155 | ✗ | infmt = av_find_input_format("sdp"); | |
| 156 | ✗ | if (!infmt) | |
| 157 | ✗ | goto fail; | |
| 158 | ✗ | sap->sdp_ctx = avformat_alloc_context(); | |
| 159 | ✗ | if (!sap->sdp_ctx) { | |
| 160 | ✗ | ret = AVERROR(ENOMEM); | |
| 161 | ✗ | goto fail; | |
| 162 | } | ||
| 163 | ✗ | sap->sdp_ctx->max_delay = s->max_delay; | |
| 164 | ✗ | sap->sdp_ctx->pb = &sap->sdp_pb.pub; | |
| 165 | ✗ | sap->sdp_ctx->interrupt_callback = s->interrupt_callback; | |
| 166 | |||
| 167 | ✗ | if ((ret = ff_copy_whiteblacklists(sap->sdp_ctx, s)) < 0) | |
| 168 | ✗ | goto fail; | |
| 169 | |||
| 170 | ✗ | ret = avformat_open_input(&sap->sdp_ctx, "temp.sdp", infmt, NULL); | |
| 171 | ✗ | if (ret < 0) | |
| 172 | ✗ | goto fail; | |
| 173 | ✗ | if (sap->sdp_ctx->ctx_flags & AVFMTCTX_NOHEADER) | |
| 174 | ✗ | s->ctx_flags |= AVFMTCTX_NOHEADER; | |
| 175 | ✗ | for (i = 0; i < sap->sdp_ctx->nb_streams; i++) { | |
| 176 | ✗ | AVStream *st = avformat_new_stream(s, NULL); | |
| 177 | ✗ | if (!st) { | |
| 178 | ✗ | ret = AVERROR(ENOMEM); | |
| 179 | ✗ | goto fail; | |
| 180 | } | ||
| 181 | ✗ | st->id = i; | |
| 182 | ✗ | ret = avcodec_parameters_copy(st->codecpar, sap->sdp_ctx->streams[i]->codecpar); | |
| 183 | ✗ | if (ret < 0) | |
| 184 | ✗ | goto fail; | |
| 185 | ✗ | st->time_base = sap->sdp_ctx->streams[i]->time_base; | |
| 186 | } | ||
| 187 | |||
| 188 | ✗ | return 0; | |
| 189 | |||
| 190 | ✗ | fail: | |
| 191 | ✗ | sap_read_close(s); | |
| 192 | ✗ | return ret; | |
| 193 | } | ||
| 194 | |||
| 195 | ✗ | static int sap_fetch_packet(AVFormatContext *s, AVPacket *pkt) | |
| 196 | { | ||
| 197 | ✗ | struct SAPState *sap = s->priv_data; | |
| 198 | ✗ | int fd = ffurl_get_file_handle(sap->ann_fd); | |
| 199 | int n, ret; | ||
| 200 | ✗ | struct pollfd p = {fd, POLLIN, 0}; | |
| 201 | uint8_t recvbuf[RTP_MAX_PACKET_LENGTH]; | ||
| 202 | |||
| 203 | ✗ | if (fd < 0) | |
| 204 | ✗ | return fd; | |
| 205 | |||
| 206 | ✗ | if (sap->eof) | |
| 207 | ✗ | return AVERROR_EOF; | |
| 208 | |||
| 209 | while (1) { | ||
| 210 | ✗ | n = poll(&p, 1, 0); | |
| 211 | ✗ | if (n <= 0 || !(p.revents & POLLIN)) | |
| 212 | break; | ||
| 213 | ✗ | ret = ffurl_read(sap->ann_fd, recvbuf, sizeof(recvbuf)); | |
| 214 | ✗ | if (ret >= 8) { | |
| 215 | ✗ | uint16_t hash = AV_RB16(&recvbuf[2]); | |
| 216 | /* Should ideally check the source IP address, too */ | ||
| 217 | ✗ | if (recvbuf[0] & 0x04 && hash == sap->hash) { | |
| 218 | /* Stream deletion */ | ||
| 219 | ✗ | sap->eof = 1; | |
| 220 | ✗ | return AVERROR_EOF; | |
| 221 | } | ||
| 222 | } | ||
| 223 | } | ||
| 224 | ✗ | ret = av_read_frame(sap->sdp_ctx, pkt); | |
| 225 | ✗ | if (ret < 0) | |
| 226 | ✗ | return ret; | |
| 227 | ✗ | if (s->ctx_flags & AVFMTCTX_NOHEADER) { | |
| 228 | ✗ | while (sap->sdp_ctx->nb_streams > s->nb_streams) { | |
| 229 | ✗ | int i = s->nb_streams; | |
| 230 | ✗ | AVStream *st = avformat_new_stream(s, NULL); | |
| 231 | ✗ | if (!st) { | |
| 232 | ✗ | return AVERROR(ENOMEM); | |
| 233 | } | ||
| 234 | ✗ | st->id = i; | |
| 235 | ✗ | avcodec_parameters_copy(st->codecpar, sap->sdp_ctx->streams[i]->codecpar); | |
| 236 | ✗ | st->time_base = sap->sdp_ctx->streams[i]->time_base; | |
| 237 | } | ||
| 238 | } | ||
| 239 | ✗ | return ret; | |
| 240 | } | ||
| 241 | |||
| 242 | const FFInputFormat ff_sap_demuxer = { | ||
| 243 | .p.name = "sap", | ||
| 244 | .p.long_name = NULL_IF_CONFIG_SMALL("SAP input"), | ||
| 245 | .p.flags = AVFMT_NOFILE, | ||
| 246 | .priv_data_size = sizeof(struct SAPState), | ||
| 247 | .read_probe = sap_probe, | ||
| 248 | .read_header = sap_read_header, | ||
| 249 | .read_packet = sap_fetch_packet, | ||
| 250 | .read_close = sap_read_close, | ||
| 251 | }; | ||
| 252 |