* RTSP/SDP client
* Copyright (c) 2002 Fabrice Bellard
*
- * This file is part of Libav.
+ * This file is part of FFmpeg.
*
- * Libav is free software; you can redistribute it and/or
+ * FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
- * Libav is distributed in the hope that it will be useful,
+ * FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with Libav; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
+#include "libavutil/avassert.h"
#include "libavutil/base64.h"
#include "libavutil/avstring.h"
#include "libavutil/intreadwrite.h"
#define RTSP_FLAG_OPTS(name, longname) \
{ name, longname, OFFSET(rtsp_flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, INT_MIN, INT_MAX, DEC, "rtsp_flags" }, \
- { "filter_src", "Only receive packets from the negotiated peer IP", 0, AV_OPT_TYPE_CONST, {.i64 = RTSP_FLAG_FILTER_SRC}, 0, 0, DEC, "rtsp_flags" }
+ { "filter_src", "only receive packets from the negotiated peer IP", 0, AV_OPT_TYPE_CONST, {.i64 = RTSP_FLAG_FILTER_SRC}, 0, 0, DEC, "rtsp_flags" }
#define RTSP_MEDIATYPE_OPTS(name, longname) \
- { name, longname, OFFSET(media_type_mask), AV_OPT_TYPE_FLAGS, { .i64 = (1 << (AVMEDIA_TYPE_DATA+1)) - 1 }, INT_MIN, INT_MAX, DEC, "allowed_media_types" }, \
+ { name, longname, OFFSET(media_type_mask), AV_OPT_TYPE_FLAGS, { .i64 = (1 << (AVMEDIA_TYPE_SUBTITLE+1)) - 1 }, INT_MIN, INT_MAX, DEC, "allowed_media_types" }, \
{ "video", "Video", 0, AV_OPT_TYPE_CONST, {.i64 = 1 << AVMEDIA_TYPE_VIDEO}, 0, 0, DEC, "allowed_media_types" }, \
{ "audio", "Audio", 0, AV_OPT_TYPE_CONST, {.i64 = 1 << AVMEDIA_TYPE_AUDIO}, 0, 0, DEC, "allowed_media_types" }, \
- { "data", "Data", 0, AV_OPT_TYPE_CONST, {.i64 = 1 << AVMEDIA_TYPE_DATA}, 0, 0, DEC, "allowed_media_types" }
+ { "data", "Data", 0, AV_OPT_TYPE_CONST, {.i64 = 1 << AVMEDIA_TYPE_DATA}, 0, 0, DEC, "allowed_media_types" }, \
+ { "subtitle", "Subtitle", 0, AV_OPT_TYPE_CONST, {.i64 = 1 << AVMEDIA_TYPE_SUBTITLE}, 0, 0, DEC, "allowed_media_types" }
#define COMMON_OPTS() \
- { "reorder_queue_size", "Number of packets to buffer for handling of reordered packets", OFFSET(reordering_queue_size), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, DEC }, \
+ { "reorder_queue_size", "set number of packets to buffer for handling of reordered packets", OFFSET(reordering_queue_size), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, DEC }, \
{ "buffer_size", "Underlying protocol send/receive buffer size", OFFSET(buffer_size), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, DEC|ENC } \
const AVOption ff_rtsp_options[] = {
- { "initial_pause", "Don't start playing the stream immediately", OFFSET(initial_pause), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, DEC },
+ { "initial_pause", "do not start playing the stream immediately", OFFSET(initial_pause), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, DEC },
FF_RTP_FLAG_OPTS(RTSPState, rtp_muxer_flags),
- { "rtsp_transport", "RTSP transport protocols", OFFSET(lower_transport_mask), AV_OPT_TYPE_FLAGS, {.i64 = 0}, INT_MIN, INT_MAX, DEC|ENC, "rtsp_transport" }, \
+ { "rtsp_transport", "set RTSP transport protocols", OFFSET(lower_transport_mask), AV_OPT_TYPE_FLAGS, {.i64 = 0}, INT_MIN, INT_MAX, DEC|ENC, "rtsp_transport" }, \
{ "udp", "UDP", 0, AV_OPT_TYPE_CONST, {.i64 = 1 << RTSP_LOWER_TRANSPORT_UDP}, 0, 0, DEC|ENC, "rtsp_transport" }, \
{ "tcp", "TCP", 0, AV_OPT_TYPE_CONST, {.i64 = 1 << RTSP_LOWER_TRANSPORT_TCP}, 0, 0, DEC|ENC, "rtsp_transport" }, \
{ "udp_multicast", "UDP multicast", 0, AV_OPT_TYPE_CONST, {.i64 = 1 << RTSP_LOWER_TRANSPORT_UDP_MULTICAST}, 0, 0, DEC, "rtsp_transport" },
{ "http", "HTTP tunneling", 0, AV_OPT_TYPE_CONST, {.i64 = (1 << RTSP_LOWER_TRANSPORT_HTTP)}, 0, 0, DEC, "rtsp_transport" },
- RTSP_FLAG_OPTS("rtsp_flags", "RTSP flags"),
- { "listen", "Wait for incoming connections", 0, AV_OPT_TYPE_CONST, {.i64 = RTSP_FLAG_LISTEN}, 0, 0, DEC, "rtsp_flags" },
- RTSP_MEDIATYPE_OPTS("allowed_media_types", "Media types to accept from the server"),
- { "min_port", "Minimum local UDP port", OFFSET(rtp_port_min), AV_OPT_TYPE_INT, {.i64 = RTSP_RTP_PORT_MIN}, 0, 65535, DEC|ENC },
- { "max_port", "Maximum local UDP port", OFFSET(rtp_port_max), AV_OPT_TYPE_INT, {.i64 = RTSP_RTP_PORT_MAX}, 0, 65535, DEC|ENC },
- { "timeout", "Maximum timeout (in seconds) to wait for incoming connections. -1 is infinite. Implies flag listen", OFFSET(initial_timeout), AV_OPT_TYPE_INT, {.i64 = -1}, INT_MIN, INT_MAX, DEC },
+ RTSP_FLAG_OPTS("rtsp_flags", "set RTSP flags"),
+ { "listen", "wait for incoming connections", 0, AV_OPT_TYPE_CONST, {.i64 = RTSP_FLAG_LISTEN}, 0, 0, DEC, "rtsp_flags" },
+ { "prefer_tcp", "try RTP via TCP first, if available", 0, AV_OPT_TYPE_CONST, {.i64 = RTSP_FLAG_PREFER_TCP}, 0, 0, DEC|ENC, "rtsp_flags" },
+ RTSP_MEDIATYPE_OPTS("allowed_media_types", "set media types to accept from the server"),
+ { "min_port", "set minimum local UDP port", OFFSET(rtp_port_min), AV_OPT_TYPE_INT, {.i64 = RTSP_RTP_PORT_MIN}, 0, 65535, DEC|ENC },
+ { "max_port", "set maximum local UDP port", OFFSET(rtp_port_max), AV_OPT_TYPE_INT, {.i64 = RTSP_RTP_PORT_MAX}, 0, 65535, DEC|ENC },
+ { "timeout", "set maximum timeout (in seconds) to wait for incoming connections (-1 is infinite, imply flag listen)", OFFSET(initial_timeout), AV_OPT_TYPE_INT, {.i64 = -1}, INT_MIN, INT_MAX, DEC },
+ { "stimeout", "set timeout (in microseconds) of socket TCP I/O operations", OFFSET(stimeout), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, DEC },
COMMON_OPTS(),
+ { "user-agent", "override User-Agent header", OFFSET(user_agent), AV_OPT_TYPE_STRING, {.str = LIBAVFORMAT_IDENT}, 0, 0, DEC },
{ NULL },
};
static const AVOption sdp_options[] = {
RTSP_FLAG_OPTS("sdp_flags", "SDP flags"),
- { "custom_io", "Use custom IO", 0, AV_OPT_TYPE_CONST, {.i64 = RTSP_FLAG_CUSTOM_IO}, 0, 0, DEC, "rtsp_flags" },
- { "rtcp_to_source", "Send RTCP packets to the source address of received packets", 0, AV_OPT_TYPE_CONST, {.i64 = RTSP_FLAG_RTCP_TO_SOURCE}, 0, 0, DEC, "rtsp_flags" },
- RTSP_MEDIATYPE_OPTS("allowed_media_types", "Media types to accept from the server"),
+ { "custom_io", "use custom I/O", 0, AV_OPT_TYPE_CONST, {.i64 = RTSP_FLAG_CUSTOM_IO}, 0, 0, DEC, "rtsp_flags" },
+ { "rtcp_to_source", "send RTCP packets to the source address of received packets", 0, AV_OPT_TYPE_CONST, {.i64 = RTSP_FLAG_RTCP_TO_SOURCE}, 0, 0, DEC, "rtsp_flags" },
+ RTSP_MEDIATYPE_OPTS("allowed_media_types", "set media types to accept from the server"),
COMMON_OPTS(),
{ NULL },
};
static const AVOption rtp_options[] = {
- RTSP_FLAG_OPTS("rtp_flags", "RTP flags"),
+ RTSP_FLAG_OPTS("rtp_flags", "set RTP flags"),
COMMON_OPTS(),
{ NULL },
};
if (*p == '-') {
p++;
get_word_sep(buf, sizeof(buf), "-", &p);
- av_parse_time(end, buf, 1);
+ if (av_parse_time(end, buf, 1) < 0)
+ av_log(NULL, AV_LOG_DEBUG, "Failed to parse interval end specification '%s'\n", buf);
}
}
codec_type = AVMEDIA_TYPE_AUDIO;
} else if (!strcmp(st_type, "video")) {
codec_type = AVMEDIA_TYPE_VIDEO;
- } else if (!strcmp(st_type, "application") || !strcmp(st_type, "text")) {
+ } else if (!strcmp(st_type, "application")) {
codec_type = AVMEDIA_TYPE_DATA;
+ } else if (!strcmp(st_type, "text")) {
+ codec_type = AVMEDIA_TYPE_SUBTITLE;
}
if (codec_type == AVMEDIA_TYPE_UNKNOWN || !(rt->media_type_mask & (1 << codec_type))) {
s1->skip_media = 1;
/* no corresponding stream */
if (rt->transport == RTSP_TRANSPORT_RAW) {
if (CONFIG_RTPDEC && !rt->ts)
- rt->ts = ff_mpegts_parse_open(s);
+ rt->ts = avpriv_mpegts_parse_open(s);
} else {
RTPDynamicProtocolHandler *handler;
handler = ff_rtp_handler_find_by_id(
}
for (i = 0; i < s1->nb_default_include_source_addrs; i++)
- av_free(s1->default_include_source_addrs[i]);
+ av_freep(&s1->default_include_source_addrs[i]);
av_freep(&s1->default_include_source_addrs);
for (i = 0; i < s1->nb_default_exclude_source_addrs; i++)
- av_free(s1->default_exclude_source_addrs[i]);
+ av_freep(&s1->default_exclude_source_addrs[i]);
av_freep(&s1->default_exclude_source_addrs);
- rt->p = av_malloc(sizeof(struct pollfd)*2*(rt->nb_rtsp_streams+1));
+ rt->p = av_malloc_array(rt->nb_rtsp_streams + 1, sizeof(struct pollfd) * 2);
if (!rt->p) return AVERROR(ENOMEM);
return 0;
}
ff_rtsp_tcp_write_packet(s, rtsp_st);
ffio_free_dyn_buf(&rtpctx->pb);
} else {
- avio_close(rtpctx->pb);
+ avio_closep(&rtpctx->pb);
}
avformat_free_context(rtpctx);
} else if (CONFIG_RTPDEC && rt->transport == RTSP_TRANSPORT_RDT)
av_free(rtsp_st->dynamic_protocol_context);
}
for (j = 0; j < rtsp_st->nb_include_source_addrs; j++)
- av_free(rtsp_st->include_source_addrs[j]);
+ av_freep(&rtsp_st->include_source_addrs[j]);
av_freep(&rtsp_st->include_source_addrs);
for (j = 0; j < rtsp_st->nb_exclude_source_addrs; j++)
- av_free(rtsp_st->exclude_source_addrs[j]);
+ av_freep(&rtsp_st->exclude_source_addrs[j]);
av_freep(&rtsp_st->exclude_source_addrs);
- av_free(rtsp_st);
+ av_freep(&rtsp_st);
}
}
- av_free(rt->rtsp_streams);
+ av_freep(&rt->rtsp_streams);
if (rt->asf_ctx) {
avformat_close_input(&rt->asf_ctx);
}
if (CONFIG_RTPDEC && rt->ts)
- ff_mpegts_parse_close(rt->ts);
- av_freep(&rt->protocols);
- av_free(rt->p);
- av_free(rt->recvbuf);
+ avpriv_mpegts_parse_close(rt->ts);
+ av_freep(&rt->p);
+ av_freep(&rt->recvbuf);
}
int ff_rtsp_open_transport_ctx(AVFormatContext *s, RTSPStream *rtsp_st)
if (!st)
s->ctx_flags |= AVFMTCTX_NOHEADER;
- if (CONFIG_RTSP_MUXER && s->oformat) {
+ if (CONFIG_RTSP_MUXER && s->oformat && st) {
int ret = ff_rtp_chain_mux_open((AVFormatContext **)&rtsp_st->transport_priv,
s, st, rtsp_st->rtp_handle,
RTSP_TCP_MAX_PACKET_SIZE,
st->time_base = ((AVFormatContext*)rtsp_st->transport_priv)->streams[0]->time_base;
} else if (rt->transport == RTSP_TRANSPORT_RAW) {
return 0; // Don't need to open any parser here
- } else if (CONFIG_RTPDEC && rt->transport == RTSP_TRANSPORT_RDT)
+ } else if (CONFIG_RTPDEC && rt->transport == RTSP_TRANSPORT_RDT && st)
rtsp_st->transport_priv = ff_rdt_parse_open(s, st->index,
rtsp_st->dynamic_protocol_context,
rtsp_st->dynamic_handler);
if (content_ptr)
*content_ptr = content;
else
- av_free(content);
+ av_freep(&content);
if (request) {
char buf[1024];
if (headers)
av_strlcat(buf, headers, sizeof(buf));
av_strlcatf(buf, sizeof(buf), "CSeq: %d\r\n", rt->seq);
- av_strlcatf(buf, sizeof(buf), "User-Agent: %s\r\n", LIBAVFORMAT_IDENT);
+ av_strlcatf(buf, sizeof(buf), "User-Agent: %s\r\n", rt->user_agent);
if (rt->session_id[0] != '\0' && (!headers ||
!strstr(headers, "\nIf-Match:"))) {
av_strlcatf(buf, sizeof(buf), "Session: %s\r\n", rt->session_id);
/* default timeout: 1 minute */
rt->timeout = 60;
- /* for each stream, make the setup request */
- /* XXX: we assume the same server is used for the control of each
- * RTSP stream */
-
/* Choose a random starting offset within the first half of the
* port range, to allow for a number of ports to try even if the offset
* happens to be at the end of the random range. */
"?localport=%d", j);
/* we will use two ports per rtp stream (rtp and rtcp) */
j += 2;
- err = ffurl_open(&rtsp_st->rtp_handle, buf, AVIO_FLAG_READ_WRITE,
- &s->interrupt_callback, &opts, rt->protocols);
+ err = ffurl_open_whitelist(&rtsp_st->rtp_handle, buf, AVIO_FLAG_READ_WRITE,
+ &s->interrupt_callback, &opts, s->protocol_whitelist, s->protocol_blacklist);
av_dict_free(&opts);
if (!err)
goto rtp_opened;
}
-
av_log(s, AV_LOG_ERROR, "Unable to open an input RTP port\n");
err = AVERROR(EIO);
goto fail;
goto fail;
} else if (reply->status_code != RTSP_STATUS_OK ||
reply->nb_transports != 1) {
- err = AVERROR_INVALIDDATA;
+ err = ff_rtsp_averror(reply->status_code, AVERROR_INVALIDDATA);
goto fail;
}
namebuf, sizeof(namebuf), NULL, 0, NI_NUMERICHOST);
ff_url_join(url, sizeof(url), "rtp", NULL, namebuf,
port, "%s", optbuf);
- if (ffurl_open(&rtsp_st->rtp_handle, url, AVIO_FLAG_READ_WRITE,
- &s->interrupt_callback, NULL, rt->protocols) < 0) {
+ if (ffurl_open_whitelist(&rtsp_st->rtp_handle, url, AVIO_FLAG_READ_WRITE,
+ &s->interrupt_callback, NULL, s->protocol_whitelist, s->protocol_blacklist) < 0) {
err = AVERROR_INVALIDDATA;
goto fail;
}
if (!ff_network_init())
return AVERROR(EIO);
- if (!rt->protocols) {
- rt->protocols = ffurl_get_protocols(NULL, NULL);
- if (!rt->protocols)
- return AVERROR(ENOMEM);
- }
-
if (s->max_delay < 0) /* Not set by the caller */
s->max_delay = s->iformat ? DEFAULT_REORDERING_DELAY : 0;
/* GET requests */
if (ffurl_alloc(&rt->rtsp_hd, httpname, AVIO_FLAG_READ,
- &s->interrupt_callback, rt->protocols) < 0) {
+ &s->interrupt_callback) < 0) {
err = AVERROR(EIO);
goto fail;
}
/* POST requests */
if (ffurl_alloc(&rt->rtsp_hd_out, httpname, AVIO_FLAG_WRITE,
- &s->interrupt_callback, rt->protocols) < 0 ) {
+ &s->interrupt_callback) < 0 ) {
err = AVERROR(EIO);
goto fail;
}
goto fail;
}
} else {
+ int ret;
/* open the tcp connection */
ff_url_join(tcpname, sizeof(tcpname), lower_rtsp_proto, NULL,
- host, port, NULL);
- if (ffurl_open(&rt->rtsp_hd, tcpname, AVIO_FLAG_READ_WRITE,
- &s->interrupt_callback, NULL, rt->protocols) < 0) {
- err = AVERROR(EIO);
+ host, port,
+ "?timeout=%d", rt->stimeout);
+ if ((ret = ffurl_open_whitelist(&rt->rtsp_hd, tcpname, AVIO_FLAG_READ_WRITE,
+ &s->interrupt_callback, NULL, s->protocol_whitelist, s->protocol_blacklist)) < 0) {
+ err = ret;
goto fail;
}
rt->rtsp_hd_out = rt->rtsp_hd;
sizeof(cmd));
ff_rtsp_send_cmd(s, "OPTIONS", rt->control_uri, cmd, reply, NULL);
if (reply->status_code != RTSP_STATUS_OK) {
- err = AVERROR_INVALIDDATA;
+ err = ff_rtsp_averror(reply->status_code, AVERROR_INVALIDDATA);
goto fail;
}
err = ff_rtsp_setup_input_streams(s, reply);
else if (CONFIG_RTSP_MUXER)
err = ff_rtsp_setup_output_streams(s, host);
+ else
+ av_assert0(0);
if (err)
goto fail;
int lower_transport = ff_log2_tab[lower_transport_mask &
~(lower_transport_mask - 1)];
+ if ((lower_transport_mask & (1 << RTSP_LOWER_TRANSPORT_TCP))
+ && (rt->rtsp_flags & RTSP_FLAG_PREFER_TCP))
+ lower_transport = RTSP_LOWER_TRANSPORT_TCP;
+
err = ff_rtsp_make_setup_request(s, host, port, lower_transport,
rt->server_type == RTSP_SERVER_REAL ?
real_challenge : NULL);
p[max_p].fd = fds[fdsidx];
p[max_p++].events = POLLIN;
}
- av_free(fds);
+ av_freep(&fds);
}
}
n = poll(p, max_p, POLL_TIMEOUT_MS);
} else if (rt->transport == RTSP_TRANSPORT_RTP) {
ret = ff_rtp_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
} else if (CONFIG_RTPDEC && rt->ts) {
- ret = ff_mpegts_parse_packet(rt->ts, pkt, rt->recvbuf + rt->recvbuf_pos, rt->recvbuf_len - rt->recvbuf_pos);
+ ret = avpriv_mpegts_parse_packet(rt->ts, pkt, rt->recvbuf + rt->recvbuf_pos, rt->recvbuf_len - rt->recvbuf_pos);
if (ret >= 0) {
rt->recvbuf_pos += ret;
ret = rt->recvbuf_pos < rt->recvbuf_len;
st2->time_base);
}
}
+ // Make real NTP start time available in AVFormatContext
+ if (s->start_time_realtime == AV_NOPTS_VALUE) {
+ s->start_time_realtime = av_rescale (rtpctx->first_rtcp_ntp_time - (NTP_OFFSET << 32), 1000000, 1LL << 32);
+ if (rtpctx->st) {
+ s->start_time_realtime -=
+ av_rescale (rtpctx->rtcp_ts_offset,
+ (uint64_t) rtpctx->st->time_base.num * 1000000,
+ rtpctx->st->time_base.den);
+ }
+ }
}
if (ret == -RTCP_BYE) {
rt->nb_byes++;
}
}
} else if (CONFIG_RTPDEC && rt->ts) {
- ret = ff_mpegts_parse_packet(rt->ts, pkt, rt->recvbuf, len);
+ ret = avpriv_mpegts_parse_packet(rt->ts, pkt, rt->recvbuf, len);
if (ret >= 0) {
if (ret < len) {
rt->recvbuf_len = len;
/* we look for a line beginning "c=IN IP" */
while (p < p_end && *p != '\0') {
- if (p + sizeof("c=IN IP") - 1 < p_end &&
+ if (sizeof("c=IN IP") - 1 < p_end - p &&
av_strstart(p, "c=IN IP", NULL))
return AVPROBE_SCORE_EXTENSION;
if (!ff_network_init())
return AVERROR(EIO);
- if (!rt->protocols) {
- rt->protocols = ffurl_get_protocols(NULL, NULL);
- if (!rt->protocols)
- return AVERROR(ENOMEM);
- }
-
if (s->max_delay < 0) /* Not set by the caller */
s->max_delay = DEFAULT_REORDERING_DELAY;
if (rt->rtsp_flags & RTSP_FLAG_CUSTOM_IO)
content[size] ='\0';
err = ff_sdp_parse(s, content);
- av_free(content);
+ av_freep(&content);
if (err) goto fail;
/* open each RTP stream */
append_source_addrs(url, sizeof(url), "block",
rtsp_st->nb_exclude_source_addrs,
rtsp_st->exclude_source_addrs);
- err = ffurl_open(&rtsp_st->rtp_handle, url, AVIO_FLAG_READ_WRITE,
- &s->interrupt_callback, &opts, rt->protocols);
+ err = ffurl_open_whitelist(&rtsp_st->rtp_handle, url, AVIO_FLAG_READ_WRITE,
+ &s->interrupt_callback, &opts, s->protocol_whitelist, s->protocol_blacklist);
av_dict_free(&opts);
if (!ff_network_init())
return AVERROR(EIO);
- if (!rt->protocols) {
- rt->protocols = ffurl_get_protocols(NULL, NULL);
- if (!rt->protocols)
- return AVERROR(ENOMEM);
- }
-
- ret = ffurl_open(&in, s->filename, AVIO_FLAG_READ,
- &s->interrupt_callback, NULL, rt->protocols);
+ ret = ffurl_open_whitelist(&in, s->filename, AVIO_FLAG_READ,
+ &s->interrupt_callback, NULL, s->protocol_whitelist, s->protocol_blacklist);
if (ret)
goto fail;
/* sdp_read_header initializes this again */
ff_network_close();
- rt->media_type_mask = (1 << (AVMEDIA_TYPE_DATA+1)) - 1;
+ rt->media_type_mask = (1 << (AVMEDIA_TYPE_SUBTITLE+1)) - 1;
ret = sdp_read_header(s);
s->pb = NULL;
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