void rtsp_parse_line(RTSPHeader *reply, const char *buf) { const char *p; /* NOTE: we do case independent match for broken servers */ p = buf; if (stristart(p, "Session:", &p)) { get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p); } else if (stristart(p, "Content-Length:", &p)) { reply->content_length = strtol(p, NULL, 10); } else if (stristart(p, "Transport:", &p)) { rtsp_parse_transport(reply, p); } else if (stristart(p, "CSeq:", &p)) { reply->seq = strtol(p, NULL, 10); } else if (stristart(p, "Range:", &p)) { rtsp_parse_range_npt(reply, p); } }
/* XXX: only one transport specification is parsed */ static void rtsp_parse_transport(RTSPHeader *reply, const char *p) { char transport_protocol[16]; char profile[16]; char lower_transport[16]; char parameter[16]; RTSPTransportField *th; char buf[256]; reply->nb_transports = 0; for(;;) { skip_spaces(&p); if (*p == '\0') break; th = &reply->transports[reply->nb_transports]; get_word_sep(transport_protocol, sizeof(transport_protocol), "/", &p); if (*p == '/') p++; get_word_sep(profile, sizeof(profile), "/;,", &p); lower_transport[0] = '\0'; if (*p == '/') { p++; get_word_sep(lower_transport, sizeof(lower_transport), ";,", &p); } if (!strcasecmp(lower_transport, "TCP")) th->protocol = RTSP_PROTOCOL_RTP_TCP; else th->protocol = RTSP_PROTOCOL_RTP_UDP; if (*p == ';') p++; /* get each parameter */ while (*p != '\0' && *p != ',') { get_word_sep(parameter, sizeof(parameter), "=;,", &p); if (!strcmp(parameter, "port")) { if (*p == '=') { p++; rtsp_parse_range(&th->port_min, &th->port_max, &p); } } else if (!strcmp(parameter, "client_port")) { if (*p == '=') { p++; rtsp_parse_range(&th->client_port_min, &th->client_port_max, &p); } } else if (!strcmp(parameter, "server_port")) { if (*p == '=') { p++; rtsp_parse_range(&th->server_port_min, &th->server_port_max, &p); } } else if (!strcmp(parameter, "interleaved")) { if (*p == '=') { p++; rtsp_parse_range(&th->interleaved_min, &th->interleaved_max, &p); } } else if (!strcmp(parameter, "multicast")) { if (th->protocol == RTSP_PROTOCOL_RTP_UDP) th->protocol = RTSP_PROTOCOL_RTP_UDP_MULTICAST; } else if (!strcmp(parameter, "ttl")) { if (*p == '=') { p++; th->ttl = strtol(p, (char **)&p, 10); } } else if (!strcmp(parameter, "destination")) { struct in_addr ipaddr; if (*p == '=') { p++; get_word_sep(buf, sizeof(buf), ";,", &p); if (inet_aton(buf, &ipaddr)) th->destination = ntohl(ipaddr.s_addr); } } while (*p != ';' && *p != '\0' && *p != ',') p++; if (*p == ';') p++; } if (*p == ',') p++; reply->nb_transports++; } }
static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1, int letter, const char *buf) { RTSPState *rt = s->priv_data; char buf1[64], st_type[64]; const char *p; int codec_type, payload_type, i; AVStream *st; RTSPStream *rtsp_st; struct in_addr sdp_ip; int ttl; #ifdef DEBUG printf("sdp: %c='%s'\n", letter, buf); #endif p = buf; switch(letter) { case 'c': get_word(buf1, sizeof(buf1), &p); if (strcmp(buf1, "IN") != 0) return; get_word(buf1, sizeof(buf1), &p); if (strcmp(buf1, "IP4") != 0) return; get_word_sep(buf1, sizeof(buf1), "/", &p); if (inet_aton(buf1, &sdp_ip) == 0) return; ttl = 16; if (*p == '/') { p++; get_word_sep(buf1, sizeof(buf1), "/", &p); ttl = atoi(buf1); } if (s->nb_streams == 0) { s1->default_ip = sdp_ip; s1->default_ttl = ttl; } else { st = s->streams[s->nb_streams - 1]; rtsp_st = st->priv_data; rtsp_st->sdp_ip = sdp_ip; rtsp_st->sdp_ttl = ttl; } break; case 's': pstrcpy(s->title, sizeof(s->title), p); break; case 'i': if (s->nb_streams == 0) { pstrcpy(s->comment, sizeof(s->comment), p); break; } break; case 'm': /* new stream */ get_word(st_type, sizeof(st_type), &p); if (!strcmp(st_type, "audio")) { codec_type = CODEC_TYPE_AUDIO; } else if (!strcmp(st_type, "video")) { codec_type = CODEC_TYPE_VIDEO; } else { return; } rtsp_st = av_mallocz(sizeof(RTSPStream)); if (!rtsp_st) return; rtsp_st->stream_index = -1; dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st); rtsp_st->sdp_ip = s1->default_ip; rtsp_st->sdp_ttl = s1->default_ttl; get_word(buf1, sizeof(buf1), &p); /* port */ rtsp_st->sdp_port = atoi(buf1); get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */ /* XXX: handle list of formats */ get_word(buf1, sizeof(buf1), &p); /* format list */ rtsp_st->sdp_payload_type = atoi(buf1); if (!strcmp(AVRtpPayloadTypes[rtsp_st->sdp_payload_type].enc_name, "MP2T")) { /* no corresponding stream */ } else { st = av_new_stream(s, 0); if (!st) return; st->priv_data = rtsp_st; rtsp_st->stream_index = st->index; st->codec->codec_type = codec_type; if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) { /* if standard payload type, we can find the codec right now */ rtp_get_codec_info(st->codec, rtsp_st->sdp_payload_type); } } /* put a default control url */ pstrcpy(rtsp_st->control_url, sizeof(rtsp_st->control_url), s->filename); break; case 'a': if (strstart(p, "control:", &p) && s->nb_streams > 0) { char proto[32]; /* get the control url */ st = s->streams[s->nb_streams - 1]; rtsp_st = st->priv_data; /* XXX: may need to add full url resolution */ url_split(proto, sizeof(proto), NULL, 0, NULL, 0, NULL, NULL, 0, p); if (proto[0] == '\0') { /* relative control URL */ pstrcat(rtsp_st->control_url, sizeof(rtsp_st->control_url), "/"); pstrcat(rtsp_st->control_url, sizeof(rtsp_st->control_url), p); } else { pstrcpy(rtsp_st->control_url, sizeof(rtsp_st->control_url), p); } } else if (strstart(p, "rtpmap:", &p)) { /* NOTE: rtpmap is only supported AFTER the 'm=' tag */ get_word(buf1, sizeof(buf1), &p); payload_type = atoi(buf1); for(i = 0; i < s->nb_streams;i++) { st = s->streams[i]; rtsp_st = st->priv_data; if (rtsp_st->sdp_payload_type == payload_type) { sdp_parse_rtpmap(st->codec, payload_type, p); } } } else if (strstart(p, "fmtp:", &p)) { /* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' tag */ get_word(buf1, sizeof(buf1), &p); payload_type = atoi(buf1); for(i = 0; i < s->nb_streams;i++) { st = s->streams[i]; rtsp_st = st->priv_data; if (rtsp_st->sdp_payload_type == payload_type) { sdp_parse_fmtp(st, p); } } } break; } }
/* parse the rtpmap description: <codec_name>/<clock_rate>[/<other params>] */ static int sdp_parse_rtpmap(AVCodecContext *codec, int payload_type, const char *p) { char buf[256]; int i; AVCodec *c; char *c_name; /* Loop into AVRtpDynamicPayloadTypes[] and AVRtpPayloadTypes[] and see if we can handle this kind of payload */ get_word_sep(buf, sizeof(buf), "/", &p); if (payload_type >= RTP_PT_PRIVATE) { /* We are in dynmaic payload type case ... search into AVRtpDynamicPayloadTypes[] */ for (i = 0; AVRtpDynamicPayloadTypes[i].codec_id != CODEC_ID_NONE; ++i) if (!strcmp(buf, AVRtpDynamicPayloadTypes[i].enc_name) && (codec->codec_type == AVRtpDynamicPayloadTypes[i].codec_type)) { codec->codec_id = AVRtpDynamicPayloadTypes[i].codec_id; break; } } else { /* We are in a standard case ( from http://www.iana.org/assignments/rtp-parameters) */ /* search into AVRtpPayloadTypes[] */ for (i = 0; AVRtpPayloadTypes[i].pt >= 0; ++i) if (!strcmp(buf, AVRtpPayloadTypes[i].enc_name) && (codec->codec_type == AVRtpPayloadTypes[i].codec_type)){ codec->codec_id = AVRtpPayloadTypes[i].codec_id; break; } } c = avcodec_find_decoder(codec->codec_id); if (c && c->name) c_name = (char *)c->name; else c_name = (char *)NULL; if (c_name) { get_word_sep(buf, sizeof(buf), "/", &p); i = atoi(buf); switch (codec->codec_type) { case CODEC_TYPE_AUDIO: av_log(codec, AV_LOG_DEBUG, " audio codec set to : %s\n", c_name); codec->sample_rate = RTSP_DEFAULT_AUDIO_SAMPLERATE; codec->channels = RTSP_DEFAULT_NB_AUDIO_CHANNELS; if (i > 0) { codec->sample_rate = i; get_word_sep(buf, sizeof(buf), "/", &p); i = atoi(buf); if (i > 0) codec->channels = i; } av_log(codec, AV_LOG_DEBUG, " audio samplerate set to : %i\n", codec->sample_rate); av_log(codec, AV_LOG_DEBUG, " audio channels set to : %i\n", codec->channels); break; case CODEC_TYPE_VIDEO: av_log(codec, AV_LOG_DEBUG, " video codec set to : %s\n", c_name); break; default: break; } return 0; } return -1; }
static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1, int letter, const char *buf) { RTSPState *rt = s->priv_data; char buf1[64], st_type[64]; const char *p; int codec_type, payload_type, i; AVStream *st; RTSPStream *rtsp_st; struct in_addr sdp_ip; int ttl; #ifdef DEBUG printf("sdp: %c='%s'\n", letter, buf); #endif p = buf; switch(letter) { case 'c': get_word(buf1, sizeof(buf1), &p); if (strcmp(buf1, "IN") != 0) return; get_word(buf1, sizeof(buf1), &p); if (strcmp(buf1, "IP4") != 0) return; get_word_sep(buf1, sizeof(buf1), "/", &p); if (inet_aton(buf1, &sdp_ip) == 0) return; ttl = 16; if (*p == '/') { p++; get_word_sep(buf1, sizeof(buf1), "/", &p); ttl = atoi(buf1); } if (s->nb_streams == 0) { s1->default_ip = sdp_ip; s1->default_ttl = ttl; } else { st = s->streams[s->nb_streams - 1]; rtsp_st = st->priv_data; rtsp_st->sdp_ip = sdp_ip; rtsp_st->sdp_ttl = ttl; } break; case 's': av_strlcpy(s->title, p, sizeof(s->title)); break; case 'i': if (s->nb_streams == 0) { av_strlcpy(s->comment, p, sizeof(s->comment)); break; } break; case 'm': /* new stream */ get_word(st_type, sizeof(st_type), &p); if (!strcmp(st_type, "audio")) { codec_type = CODEC_TYPE_AUDIO; } else if (!strcmp(st_type, "video")) { codec_type = CODEC_TYPE_VIDEO; } else { return; } rtsp_st = av_mallocz(sizeof(RTSPStream)); if (!rtsp_st) return; rtsp_st->stream_index = -1; dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st); rtsp_st->sdp_ip = s1->default_ip; rtsp_st->sdp_ttl = s1->default_ttl; get_word(buf1, sizeof(buf1), &p); /* port */ rtsp_st->sdp_port = atoi(buf1); get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */ /* XXX: handle list of formats */ get_word(buf1, sizeof(buf1), &p); /* format list */ rtsp_st->sdp_payload_type = atoi(buf1); if (!strcmp(ff_rtp_enc_name(rtsp_st->sdp_payload_type), "MP2T")) { /* no corresponding stream */ } else { st = av_new_stream(s, 0); if (!st) return; st->priv_data = rtsp_st; rtsp_st->stream_index = st->index; st->codec->codec_type = codec_type; if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) { /* if standard payload type, we can find the codec right now */ rtp_get_codec_info(st->codec, rtsp_st->sdp_payload_type); } } /* put a default control url */ av_strlcpy(rtsp_st->control_url, s->filename, sizeof(rtsp_st->control_url)); break; case 'a': if (av_strstart(p, "control:", &p) && s->nb_streams > 0) { char proto[32]; /* get the control url */ st = s->streams[s->nb_streams - 1]; rtsp_st = st->priv_data; /* XXX: may need to add full url resolution */ url_split(proto, sizeof(proto), NULL, 0, NULL, 0, NULL, NULL, 0, p); if (proto[0] == '\0') { /* relative control URL */ av_strlcat(rtsp_st->control_url, "/", sizeof(rtsp_st->control_url)); av_strlcat(rtsp_st->control_url, p, sizeof(rtsp_st->control_url)); } else { av_strlcpy(rtsp_st->control_url, p, sizeof(rtsp_st->control_url)); } } else if (av_strstart(p, "rtpmap:", &p)) { /* NOTE: rtpmap is only supported AFTER the 'm=' tag */ get_word(buf1, sizeof(buf1), &p); payload_type = atoi(buf1); for(i = 0; i < s->nb_streams;i++) { st = s->streams[i]; rtsp_st = st->priv_data; if (rtsp_st->sdp_payload_type == payload_type) { sdp_parse_rtpmap(st->codec, rtsp_st, payload_type, p); } } } else if (av_strstart(p, "fmtp:", &p)) { /* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' tag */ get_word(buf1, sizeof(buf1), &p); payload_type = atoi(buf1); for(i = 0; i < s->nb_streams;i++) { st = s->streams[i]; rtsp_st = st->priv_data; if (rtsp_st->sdp_payload_type == payload_type) { if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) { if(!rtsp_st->dynamic_handler->parse_sdp_a_line(st, rtsp_st->dynamic_protocol_context, buf)) { sdp_parse_fmtp(st, p); } } else { sdp_parse_fmtp(st, p); } } } } else if(av_strstart(p, "framesize:", &p)) { // let dynamic protocol handlers have a stab at the line. get_word(buf1, sizeof(buf1), &p); payload_type = atoi(buf1); for(i = 0; i < s->nb_streams;i++) { st = s->streams[i]; rtsp_st = st->priv_data; if (rtsp_st->sdp_payload_type == payload_type) { if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) { rtsp_st->dynamic_handler->parse_sdp_a_line(st, rtsp_st->dynamic_protocol_context, buf); } } } } else if(av_strstart(p, "range:", &p)) { int64_t start, end; // this is so that seeking on a streamed file can work. rtsp_parse_range_npt(p, &start, &end); s->start_time= start; s->duration= (end==AV_NOPTS_VALUE)?AV_NOPTS_VALUE:end-start; // AV_NOPTS_VALUE means live broadcast (and can't seek) } else if (s->nb_streams > 0) { rtsp_st = s->streams[s->nb_streams - 1]->priv_data; if (rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) rtsp_st->dynamic_handler->parse_sdp_a_line(s->streams[s->nb_streams - 1], rtsp_st->dynamic_protocol_context, buf); } break; } }
/* parse the rtpmap description: <codec_name>/<clock_rate>[/<other params>] */ static int sdp_parse_rtpmap(AVCodecContext *codec, RTSPStream *rtsp_st, int payload_type, const char *p) { char buf[256]; int i; AVCodec *c; const char *c_name; /* Loop into AVRtpDynamicPayloadTypes[] and AVRtpPayloadTypes[] and see if we can handle this kind of payload */ get_word_sep(buf, sizeof(buf), "/", &p); if (payload_type >= RTP_PT_PRIVATE) { RTPDynamicProtocolHandler *handler= RTPFirstDynamicPayloadHandler; while(handler) { if (!strcmp(buf, handler->enc_name) && (codec->codec_type == handler->codec_type)) { codec->codec_id = handler->codec_id; rtsp_st->dynamic_handler= handler; if(handler->open) { rtsp_st->dynamic_protocol_context= handler->open(); } break; } handler= handler->next; } } else { /* We are in a standard case ( from http://www.iana.org/assignments/rtp-parameters) */ /* search into AVRtpPayloadTypes[] */ codec->codec_id = ff_rtp_codec_id(buf, codec->codec_type); } c = avcodec_find_decoder(codec->codec_id); if (c && c->name) c_name = c->name; else c_name = (char *)NULL; if (c_name) { get_word_sep(buf, sizeof(buf), "/", &p); i = atoi(buf); switch (codec->codec_type) { case CODEC_TYPE_AUDIO: av_log(codec, AV_LOG_DEBUG, " audio codec set to : %s\n", c_name); codec->sample_rate = RTSP_DEFAULT_AUDIO_SAMPLERATE; codec->channels = RTSP_DEFAULT_NB_AUDIO_CHANNELS; if (i > 0) { codec->sample_rate = i; get_word_sep(buf, sizeof(buf), "/", &p); i = atoi(buf); if (i > 0) codec->channels = i; // TODO: there is a bug here; if it is a mono stream, and less than 22000Hz, faad upconverts to stereo and twice the // frequency. No problem, but the sample rate is being set here by the sdp line. Upcoming patch forthcoming. (rdm) } av_log(codec, AV_LOG_DEBUG, " audio samplerate set to : %i\n", codec->sample_rate); av_log(codec, AV_LOG_DEBUG, " audio channels set to : %i\n", codec->channels); break; case CODEC_TYPE_VIDEO: av_log(codec, AV_LOG_DEBUG, " video codec set to : %s\n", c_name); break; default: break; } return 0; } return -1; }