mirror of https://github.com/FFmpeg/FFmpeg.git
Originally committed as revision 25463 to svn://svn.ffmpeg.org/ffmpeg/trunkoldabi
Martin Storsjö
14 years ago
parent
65cdee9c95
commit
01c8d258da
8 changed files with 289 additions and 5 deletions
@ -0,0 +1,238 @@ |
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/*
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* Session Announcement Protocol (RFC 2974) demuxer |
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* Copyright (c) 2010 Martin Storsjo |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "avformat.h" |
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#include "libavutil/avstring.h" |
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#include "libavutil/intreadwrite.h" |
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#include "network.h" |
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#include "os_support.h" |
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#include "internal.h" |
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#if HAVE_SYS_SELECT_H |
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#include <sys/select.h> |
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#endif |
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struct SAPState { |
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URLContext *ann_fd; |
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AVFormatContext *sdp_ctx; |
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ByteIOContext sdp_pb; |
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uint16_t hash; |
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char *sdp; |
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int eof; |
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}; |
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static int sap_probe(AVProbeData *p) |
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{ |
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if (av_strstart(p->filename, "sap:", NULL)) |
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return AVPROBE_SCORE_MAX; |
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return 0; |
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} |
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static int sap_read_close(AVFormatContext *s) |
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{ |
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struct SAPState *sap = s->priv_data; |
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if (sap->sdp_ctx) |
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av_close_input_stream(sap->sdp_ctx); |
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if (sap->ann_fd) |
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url_close(sap->ann_fd); |
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av_freep(&sap->sdp); |
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ff_network_close(); |
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return 0; |
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} |
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static int sap_read_header(AVFormatContext *s, |
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AVFormatParameters *ap) |
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{ |
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struct SAPState *sap = s->priv_data; |
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char host[1024], path[1024], url[1024]; |
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uint8_t recvbuf[1500]; |
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int port; |
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int ret, i; |
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AVInputFormat* infmt; |
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if (!ff_network_init()) |
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return AVERROR(EIO); |
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av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port, |
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path, sizeof(path), s->filename); |
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if (port < 0) |
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port = 9875; |
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if (!host[0]) { |
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/* Listen for announcements on sap.mcast.net if no host was specified */ |
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av_strlcpy(host, "224.2.127.254", sizeof(host)); |
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} |
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ff_url_join(url, sizeof(url), "udp", NULL, host, port, "?localport=%d", |
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port); |
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ret = url_open(&sap->ann_fd, url, URL_RDONLY); |
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if (ret) |
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goto fail; |
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while (1) { |
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int addr_type, auth_len; |
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int pos; |
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ret = url_read(sap->ann_fd, recvbuf, sizeof(recvbuf) - 1); |
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if (ret == AVERROR(EAGAIN)) |
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continue; |
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if (ret < 0) |
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goto fail; |
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recvbuf[ret] = '\0'; /* Null terminate for easier parsing */ |
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if (ret < 8) { |
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av_log(s, AV_LOG_WARNING, "Received too short packet\n"); |
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continue; |
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} |
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if ((recvbuf[0] & 0xe0) != 0x20) { |
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av_log(s, AV_LOG_WARNING, "Unsupported SAP version packet " |
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"received\n"); |
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continue; |
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} |
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if (recvbuf[0] & 0x04) { |
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av_log(s, AV_LOG_WARNING, "Received stream deletion " |
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"announcement\n"); |
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continue; |
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} |
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addr_type = recvbuf[0] & 0x10; |
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auth_len = recvbuf[1]; |
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sap->hash = AV_RB16(&recvbuf[2]); |
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pos = 4; |
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if (addr_type) |
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pos += 16; /* IPv6 */ |
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else |
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pos += 4; /* IPv4 */ |
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pos += auth_len * 4; |
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if (pos + 4 >= ret) { |
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av_log(s, AV_LOG_WARNING, "Received too short packet\n"); |
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continue; |
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} |
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#define MIME "application/sdp" |
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if (strcmp(&recvbuf[pos], MIME) == 0) { |
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pos += strlen(MIME) + 1; |
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} else if (strncmp(&recvbuf[pos], "v=0\r\n", 5) == 0) { |
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// Direct SDP without a mime type
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} else { |
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av_log(s, AV_LOG_WARNING, "Unsupported mime type %s\n", |
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&recvbuf[pos]); |
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continue; |
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} |
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sap->sdp = av_strdup(&recvbuf[pos]); |
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break; |
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} |
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av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", sap->sdp); |
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init_put_byte(&sap->sdp_pb, sap->sdp, strlen(sap->sdp), 0, NULL, NULL, |
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NULL, NULL); |
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infmt = av_find_input_format("sdp"); |
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if (!infmt) |
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goto fail; |
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sap->sdp_ctx = avformat_alloc_context(); |
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if (!sap->sdp_ctx) { |
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ret = AVERROR(ENOMEM); |
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goto fail; |
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} |
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sap->sdp_ctx->max_delay = s->max_delay; |
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ap->prealloced_context = 1; |
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ret = av_open_input_stream(&sap->sdp_ctx, &sap->sdp_pb, "temp.sdp", |
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infmt, ap); |
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if (ret < 0) |
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goto fail; |
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if (sap->sdp_ctx->ctx_flags & AVFMTCTX_NOHEADER) |
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s->ctx_flags |= AVFMTCTX_NOHEADER; |
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for (i = 0; i < sap->sdp_ctx->nb_streams; i++) { |
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AVStream *st = av_new_stream(s, i); |
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if (!st) { |
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ret = AVERROR(ENOMEM); |
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goto fail; |
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} |
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avcodec_copy_context(st->codec, sap->sdp_ctx->streams[i]->codec); |
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st->time_base = sap->sdp_ctx->streams[i]->time_base; |
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} |
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return 0; |
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fail: |
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sap_read_close(s); |
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return ret; |
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} |
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static int sap_fetch_packet(AVFormatContext *s, AVPacket *pkt) |
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{ |
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struct SAPState *sap = s->priv_data; |
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int fd = url_get_file_handle(sap->ann_fd); |
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int n, ret; |
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fd_set rfds; |
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struct timeval tv; |
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uint8_t recvbuf[1500]; |
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if (sap->eof) |
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return AVERROR_EOF; |
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while (1) { |
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FD_ZERO(&rfds); |
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FD_SET(fd, &rfds); |
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tv.tv_sec = tv.tv_usec = 0; |
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n = select(fd + 1, &rfds, NULL, NULL, &tv); |
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if (n <= 0 || !FD_ISSET(fd, &rfds)) |
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break; |
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ret = url_read(sap->ann_fd, recvbuf, sizeof(recvbuf)); |
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if (ret >= 8) { |
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uint16_t hash = AV_RB16(&recvbuf[2]); |
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/* Should ideally check the source IP address, too */ |
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if (recvbuf[0] & 0x04 && hash == sap->hash) { |
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/* Stream deletion */ |
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sap->eof = 1; |
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return AVERROR_EOF; |
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} |
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} |
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} |
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ret = av_read_frame(sap->sdp_ctx, pkt); |
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if (ret < 0) |
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return ret; |
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if (s->ctx_flags & AVFMTCTX_NOHEADER) { |
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while (sap->sdp_ctx->nb_streams > s->nb_streams) { |
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int i = s->nb_streams; |
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AVStream *st = av_new_stream(s, i); |
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if (!st) { |
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av_free_packet(pkt); |
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return AVERROR(ENOMEM); |
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} |
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avcodec_copy_context(st->codec, sap->sdp_ctx->streams[i]->codec); |
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st->time_base = sap->sdp_ctx->streams[i]->time_base; |
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} |
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} |
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return ret; |
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} |
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AVInputFormat sap_demuxer = { |
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"sap", |
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NULL_IF_CONFIG_SMALL("SAP input format"), |
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sizeof(struct SAPState), |
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sap_probe, |
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sap_read_header, |
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sap_fetch_packet, |
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sap_read_close, |
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.flags = AVFMT_NOFILE, |
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}; |
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