renamed libav to libavformat

Originally committed as revision 1276 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 1163 insertions, 0 deletions

diff --git a/libavformat/rtsp.c b/libavformat/rtsp.c
new file mode 100644
index 0000000000..c173cb89b7
--- /dev/null
+++ b/libavformat/rtsp.c
@@ -0,0 +1,1163 @@
+/*
+ * RTSP/SDP client
+ * Copyright (c) 2002 Fabrice Bellard.
+ *
+ * This library 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 of the License, or (at your option) any later version.
+ *
+ * This library 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 this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#include "avformat.h"
+
+#include <sys/time.h>
+#include <netinet/in.h>
+#include <sys/socket.h>
+#include <ctype.h>
+#ifndef __BEOS__
+# include <arpa/inet.h>
+#else
+# include "barpainet.h"
+#endif
+
+//#define DEBUG
+
+typedef struct RTSPState {
+    URLContext *rtsp_hd; /* RTSP TCP connexion handle */
+    ByteIOContext rtsp_gb;
+    int seq;        /* RTSP command sequence number */
+    char session_id[512];
+    enum RTSPProtocol protocol;
+    char last_reply[2048]; /* XXX: allocate ? */
+} RTSPState;
+
+typedef struct RTSPStream {
+    AVFormatContext *ic;
+    int interleaved_min, interleaved_max;  /* interleave ids, if TCP transport */
+    char control_url[1024]; /* url for this stream (from SDP) */
+
+    int sdp_port; /* port (from SDP content - not used in RTSP) */
+    struct in_addr sdp_ip; /* IP address  (from SDP content - not used in RTSP) */
+    int sdp_ttl;  /* IP TTL (from SDP content - not used in RTSP) */
+    int sdp_payload_type; /* payload type - only used in SDP */
+} RTSPStream;
+
+/* suppress this hack */
+int rtsp_abort_req = 0;
+
+/* XXX: currently, the only way to change the protocols consists in
+   changing this variable */
+int rtsp_default_protocols = (1 << RTSP_PROTOCOL_RTP_TCP) | (1 << RTSP_PROTOCOL_RTP_UDP) | (1 << RTSP_PROTOCOL_RTP_UDP_MULTICAST);
+
+/* if non zero, then set a range for RTP ports */
+int rtsp_rtp_port_min = 0;
+int rtsp_rtp_port_max = 0;
+
+FFRTSPCallback *ff_rtsp_callback = NULL;
+
+static int rtsp_probe(AVProbeData *p)
+{
+    if (strstart(p->filename, "rtsp:", NULL))
+        return AVPROBE_SCORE_MAX;
+    return 0;
+}
+
+static int redir_isspace(int c)
+{
+    return (c == ' ' || c == '\t' || c == '\n' || c == '\r');
+}
+
+static void skip_spaces(const char **pp)
+{
+    const char *p;
+    p = *pp;
+    while (redir_isspace(*p))
+        p++;
+    *pp = p;
+}
+
+static void get_word_sep(char *buf, int buf_size, const char *sep, 
+                         const char **pp)
+{
+    const char *p;
+    char *q;
+
+    p = *pp;
+    skip_spaces(&p);
+    q = buf;
+    while (!strchr(sep, *p) && *p != '\0') {
+        if ((q - buf) < buf_size - 1)
+            *q++ = *p;
+        p++;
+    }
+    if (buf_size > 0)
+        *q = '\0';
+    *pp = p;
+}
+
+static void get_word(char *buf, int buf_size, const char **pp)
+{
+    const char *p;
+    char *q;
+
+    p = *pp;
+    skip_spaces(&p);
+    q = buf;
+    while (!redir_isspace(*p) && *p != '\0') {
+        if ((q - buf) < buf_size - 1)
+            *q++ = *p;
+        p++;
+    }
+    if (buf_size > 0)
+        *q = '\0';
+    *pp = p;
+}
+
+/* parse the rtpmap description: <codec_name>/<clock_rate>[/<other
+   params>] */
+static int sdp_parse_rtpmap(AVCodecContext *codec, const char *p)
+{
+    char buf[256];
+
+    /* codec name */
+    get_word_sep(buf, sizeof(buf), "/", &p);
+    if (!strcmp(buf, "MP4V-ES")) {
+        codec->codec_id = CODEC_ID_MPEG4;
+        return 0;
+    } else {
+        return -1;
+    }
+}
+
+/* return the length and optionnaly the data */
+static int hex_to_data(uint8_t *data, const char *p)
+{
+    int c, len, v;
+
+    len = 0;
+    v = 1;
+    for(;;) {
+        skip_spaces(&p);
+        if (p == '\0')
+            break;
+        c = toupper((unsigned char)*p++);
+        if (c >= '0' && c <= '9')
+            c = c - '0';
+        else if (c >= 'A' && c <= 'F')
+            c = c - 'A' + 10;
+        else
+            break;
+        v = (v << 4) | c;
+        if (v & 0x100) {
+            if (data)
+                data[len] = v;
+            len++;
+            v = 1;
+        }
+    }
+    return len;
+}
+
+static void sdp_parse_fmtp(AVCodecContext *codec, const char *p)
+{
+    char attr[256];
+    char value[4096];
+    int len;
+
+    /* loop on each attribute */
+    for(;;) {
+        skip_spaces(&p);
+        if (*p == '\0')
+            break;
+        get_word_sep(attr, sizeof(attr), "=", &p);
+        if (*p == '=') 
+            p++;
+        get_word_sep(value, sizeof(value), ";", &p);
+        if (*p == ';')
+            p++;
+        /* handle MPEG4 video */
+        switch(codec->codec_id) {
+        case CODEC_ID_MPEG4:
+            if (!strcmp(attr, "config")) {
+                /* decode the hexa encoded parameter */
+                len = hex_to_data(NULL, value);
+                codec->extradata = av_mallocz(len);
+                if (!codec->extradata)
+                    goto fail;
+                codec->extradata_size = len;
+                hex_to_data(codec->extradata, value);
+            }
+            break;
+        default:
+            /* ignore data for other codecs */
+            break;
+        }
+    fail: ;
+        //        printf("'%s' = '%s'\n", attr, value);
+    }
+}
+
+typedef struct SDPParseState {
+    /* SDP only */
+    struct in_addr default_ip;
+    int default_ttl;
+} SDPParseState;
+
+static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
+                           int letter, const char *buf)
+{
+    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;
+        st = av_new_stream(s, s->nb_streams);
+        if (!st) 
+            return;
+        st->priv_data = rtsp_st;
+
+        rtsp_st->sdp_ip = s1->default_ip;
+        rtsp_st->sdp_ttl = s1->default_ttl;
+
+        st->codec.codec_type = codec_type;
+
+        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 (rtsp_st->sdp_payload_type < 96) {
+            /* 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, 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, 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->codec, p);
+                }
+            }
+        }
+        break;
+    }
+}
+
+int sdp_parse(AVFormatContext *s, const char *content)
+{
+    const char *p;
+    int letter;
+    char buf[1024], *q;
+    SDPParseState sdp_parse_state, *s1 = &sdp_parse_state;
+    
+    memset(s1, 0, sizeof(SDPParseState));
+    p = content;
+    for(;;) {
+        skip_spaces(&p);
+        letter = *p;
+        if (letter == '\0')
+            break;
+        p++;
+        if (*p != '=')
+            goto next_line;
+        p++;
+        /* get the content */
+        q = buf;
+        while (*p != '\n' && *p != '\0') {
+            if ((q - buf) < sizeof(buf) - 1)
+                *q++ = *p;
+            p++;
+        }
+        *q = '\0';
+        sdp_parse_line(s, s1, letter, buf);
+    next_line:
+        while (*p != '\n' && *p != '\0')
+            p++;
+        if (*p == '\n')
+            p++;
+    }
+    return 0;
+}
+
+static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
+{
+    const char *p;
+    int v;
+
+    p = *pp;
+    skip_spaces(&p);
+    v = strtol(p, (char **)&p, 10);
+    if (*p == '-') {
+        p++;
+        *min_ptr = v;
+        v = strtol(p, (char **)&p, 10);
+        *max_ptr = v;
+    } else {
+        *min_ptr = v;
+        *max_ptr = v;
+    }
+    *pp = 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 == '/') {
+            get_word_sep(lower_transport, sizeof(lower_transport), 
+                         ";,", &p);
+        }
+        if (!strcmp(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++;
+    }
+}
+
+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);
+    }
+}
+
+
+static void rtsp_send_cmd(AVFormatContext *s, 
+                          const char *cmd, RTSPHeader *reply, 
+                          unsigned char **content_ptr)
+{
+    RTSPState *rt = s->priv_data;
+    char buf[4096], buf1[1024], *q;
+    unsigned char ch;
+    const char *p;
+    int content_length, line_count;
+    unsigned char *content = NULL;
+
+    memset(reply, 0, sizeof(RTSPHeader));
+
+    rt->seq++;
+    pstrcpy(buf, sizeof(buf), cmd);
+    snprintf(buf1, sizeof(buf1), "CSeq: %d\n", rt->seq);
+    pstrcat(buf, sizeof(buf), buf1);
+    if (rt->session_id[0] != '\0' && !strstr(cmd, "\nIf-Match:")) {
+        snprintf(buf1, sizeof(buf1), "Session: %s\n", rt->session_id);
+        pstrcat(buf, sizeof(buf), buf1);
+    }
+    pstrcat(buf, sizeof(buf), "\n");
+#ifdef DEBUG
+    printf("Sending:\n%s--\n", buf);
+#endif
+    url_write(rt->rtsp_hd, buf, strlen(buf));
+
+    /* parse reply (XXX: use buffers) */
+    line_count = 0;
+    rt->last_reply[0] = '\0';
+    for(;;) {
+        q = buf;
+        for(;;) {
+            if (url_read(rt->rtsp_hd, &ch, 1) == 0)
+                break;
+            if (ch == '\n')
+                break;
+            if (ch != '\r') {
+                if ((q - buf) < sizeof(buf) - 1)
+                    *q++ = ch;
+            }
+        }
+        *q = '\0';
+#ifdef DEBUG
+        printf("line='%s'\n", buf);
+#endif
+        /* test if last line */
+        if (buf[0] == '\0')
+            break;
+        p = buf;
+        if (line_count == 0) {
+            /* get reply code */
+            get_word(buf1, sizeof(buf1), &p);
+            get_word(buf1, sizeof(buf1), &p);
+            reply->status_code = atoi(buf1);
+        } else {
+            rtsp_parse_line(reply, p);
+            pstrcat(rt->last_reply, sizeof(rt->last_reply), p);
+            pstrcat(rt->last_reply, sizeof(rt->last_reply), "\n");
+        }
+        line_count++;
+    }
+    
+    if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
+        pstrcpy(rt->session_id, sizeof(rt->session_id), reply->session_id);
+    
+    content_length = reply->content_length;
+    if (content_length > 0) {
+        /* leave some room for a trailing '\0' (useful for simple parsing) */
+        content = av_malloc(content_length + 1);
+        url_read(rt->rtsp_hd, content, content_length);
+        content[content_length] = '\0';
+    }
+    if (content_ptr)
+        *content_ptr = content;
+}
+
+/* useful for modules: set RTSP callback function */
+
+void rtsp_set_callback(FFRTSPCallback *rtsp_cb)
+{
+    ff_rtsp_callback = rtsp_cb;
+}
+
+
+static int rtsp_read_header(AVFormatContext *s,
+                            AVFormatParameters *ap)
+{
+    RTSPState *rt = s->priv_data;
+    char host[1024], path[1024], tcpname[1024], cmd[2048];
+    URLContext *rtsp_hd;
+    int port, i, ret, err;
+    RTSPHeader reply1, *reply = &reply1;
+    unsigned char *content = NULL;
+    AVStream *st;
+    RTSPStream *rtsp_st;
+    int protocol_mask;
+
+    rtsp_abort_req = 0;
+    
+    /* extract hostname and port */
+    url_split(NULL, 0,
+              host, sizeof(host), &port, path, sizeof(path), s->filename);
+    if (port < 0)
+        port = RTSP_DEFAULT_PORT;
+
+    /* open the tcp connexion */
+    snprintf(tcpname, sizeof(tcpname), "tcp://%s:%d", host, port);
+    if (url_open(&rtsp_hd, tcpname, URL_RDWR) < 0)
+        return AVERROR_IO;
+    rt->rtsp_hd = rtsp_hd;
+    rt->seq = 0;
+    
+    /* describe the stream */
+    snprintf(cmd, sizeof(cmd), 
+             "DESCRIBE %s RTSP/1.0\n"
+             "Accept: application/sdp\n",
+             s->filename);
+    rtsp_send_cmd(s, cmd, reply, &content);
+    if (!content) {
+        err = AVERROR_INVALIDDATA;
+        goto fail;
+    }
+    if (reply->status_code != RTSP_STATUS_OK) {
+        err = AVERROR_INVALIDDATA;
+        goto fail;
+    }
+        
+    /* now we got the SDP description, we parse it */
+    ret = sdp_parse(s, (const char *)content);
+    av_freep(&content);
+    if (ret < 0) {
+        err = AVERROR_INVALIDDATA;
+        goto fail;
+    }
+    
+    protocol_mask = rtsp_default_protocols;
+
+    /* for each stream, make the setup request */
+    /* XXX: we assume the same server is used for the control of each
+       RTSP stream */
+    for(i=0;i<s->nb_streams;i++) {
+        char transport[2048];
+        AVInputFormat *fmt;
+
+        st = s->streams[i];
+        rtsp_st = st->priv_data;
+
+        /* compute available transports */
+        transport[0] = '\0';
+
+        /* RTP/UDP */
+        if (protocol_mask & (1 << RTSP_PROTOCOL_RTP_UDP)) {
+            char buf[256];
+            int j;
+
+            /* first try in specified port range */
+            if (rtsp_rtp_port_min != 0) {
+                for(j=rtsp_rtp_port_min;j<=rtsp_rtp_port_max;j++) {
+                    snprintf(buf, sizeof(buf), "rtp://?localport=%d", j);
+                    if (!av_open_input_file(&rtsp_st->ic, buf, 
+                                            &rtp_demux, 0, NULL))
+                        goto rtp_opened;
+                }
+            }
+
+            /* then try on any port */
+            if (av_open_input_file(&rtsp_st->ic, "rtp://", 
+                                       &rtp_demux, 0, NULL) < 0) {
+                    err = AVERROR_INVALIDDATA;
+                    goto fail;
+            }
+
+        rtp_opened:
+            port = rtp_get_local_port(url_fileno(&rtsp_st->ic->pb));
+            if (transport[0] != '\0')
+                pstrcat(transport, sizeof(transport), ",");
+            snprintf(transport + strlen(transport), sizeof(transport) - strlen(transport) - 1,
+                     "RTP/AVP/UDP;unicast;client_port=%d-%d",
+                     port, port + 1);
+        }
+
+        /* RTP/TCP */
+        if (protocol_mask & (1 << RTSP_PROTOCOL_RTP_TCP)) {
+            if (transport[0] != '\0')
+                pstrcat(transport, sizeof(transport), ",");
+            snprintf(transport + strlen(transport), sizeof(transport) - strlen(transport) - 1,
+                     "RTP/AVP/TCP");
+        }
+
+        if (protocol_mask & (1 << RTSP_PROTOCOL_RTP_UDP_MULTICAST)) {
+            if (transport[0] != '\0')
+                pstrcat(transport, sizeof(transport), ",");
+            snprintf(transport + strlen(transport), 
+                     sizeof(transport) - strlen(transport) - 1,
+                     "RTP/AVP/UDP;multicast");
+        }
+        
+        snprintf(cmd, sizeof(cmd), 
+                 "SETUP %s RTSP/1.0\n"
+                 "Transport: %s\n",
+                 rtsp_st->control_url, transport);
+        rtsp_send_cmd(s, cmd, reply, NULL);
+        if (reply->status_code != RTSP_STATUS_OK ||
+            reply->nb_transports != 1) {
+            err = AVERROR_INVALIDDATA;
+            goto fail;
+        }
+
+        /* XXX: same protocol for all streams is required */
+        if (i > 0) {
+            if (reply->transports[0].protocol != rt->protocol) {
+                err = AVERROR_INVALIDDATA;
+                goto fail;
+            }
+        } else {
+            rt->protocol = reply->transports[0].protocol;
+        }
+
+        /* close RTP connection if not choosen */
+        if (reply->transports[0].protocol != RTSP_PROTOCOL_RTP_UDP &&
+            (protocol_mask & (1 << RTSP_PROTOCOL_RTP_UDP))) {
+            av_close_input_file(rtsp_st->ic);
+            rtsp_st->ic = NULL;
+        }
+
+        switch(reply->transports[0].protocol) {
+        case RTSP_PROTOCOL_RTP_TCP:
+            fmt = &rtp_demux;
+            if (av_open_input_file(&rtsp_st->ic, "null", fmt, 0, NULL) < 0) {
+                err = AVERROR_INVALIDDATA;
+                goto fail;
+            }
+            rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
+            rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
+            break;
+            
+        case RTSP_PROTOCOL_RTP_UDP:
+            {
+                char url[1024];
+                
+                /* XXX: also use address if specified */
+                snprintf(url, sizeof(url), "rtp://%s:%d", 
+                         host, reply->transports[0].server_port_min);
+                if (rtp_set_remote_url(url_fileno(&rtsp_st->ic->pb), url) < 0) {
+                    err = AVERROR_INVALIDDATA;
+                    goto fail;
+                }
+            }
+            break;
+        case RTSP_PROTOCOL_RTP_UDP_MULTICAST:
+            {
+                char url[1024];
+                int ttl;
+
+                fmt = &rtp_demux;
+                ttl = reply->transports[0].ttl;
+                if (!ttl)
+                    ttl = 16;
+                snprintf(url, sizeof(url), "rtp://%s:%d?multicast=1&ttl=%d", 
+                         host, 
+                         reply->transports[0].server_port_min,
+                         ttl);
+                if (av_open_input_file(&rtsp_st->ic, url, fmt, 0, NULL) < 0) {
+                    err = AVERROR_INVALIDDATA;
+                    goto fail;
+                }
+            }
+            break;
+        }
+    }
+
+    /* use callback if available to extend setup */
+    if (ff_rtsp_callback) {
+        if (ff_rtsp_callback(RTSP_ACTION_CLIENT_SETUP, rt->session_id, 
+                             NULL, 0, rt->last_reply) < 0) {
+            err = AVERROR_INVALIDDATA;
+            goto fail;
+        }
+    }
+                         
+    /* start playing */
+    snprintf(cmd, sizeof(cmd), 
+             "PLAY %s RTSP/1.0\n",
+             s->filename);
+    rtsp_send_cmd(s, cmd, reply, NULL);
+    if (reply->status_code != RTSP_STATUS_OK) {
+        err = AVERROR_INVALIDDATA;
+        goto fail;
+    }
+
+    /* open TCP with bufferized input */
+    if (rt->protocol == RTSP_PROTOCOL_RTP_TCP) {
+        if (url_fdopen(&rt->rtsp_gb, rt->rtsp_hd) < 0) {
+            err = AVERROR_NOMEM;
+            goto fail;
+        }
+    }
+
+    return 0;
+ fail:
+    for(i=0;i<s->nb_streams;i++) {
+        st = s->streams[i];
+        rtsp_st = st->priv_data;
+        if (rtsp_st) {
+            if (rtsp_st->ic)
+                av_close_input_file(rtsp_st->ic);
+        }
+        av_free(rtsp_st);
+    }
+    av_freep(&content);
+    url_close(rt->rtsp_hd);
+    return err;
+}
+
+static int tcp_read_packet(AVFormatContext *s,
+                           AVPacket *pkt)
+{
+    RTSPState *rt = s->priv_data;
+    ByteIOContext *rtsp_gb = &rt->rtsp_gb;
+    int c, id, len, i, ret;
+    AVStream *st;
+    RTSPStream *rtsp_st;
+    char buf[RTP_MAX_PACKET_LENGTH];
+
+ redo:
+    for(;;) {
+        c = url_fgetc(rtsp_gb);
+        if (c == URL_EOF)
+            return AVERROR_IO;
+        if (c == '$')
+            break;
+    }
+    id = get_byte(rtsp_gb);
+    len = get_be16(rtsp_gb);
+    if (len > RTP_MAX_PACKET_LENGTH || len < 12)
+        goto redo;
+    /* get the data */
+    get_buffer(rtsp_gb, buf, len);
+    
+    /* find the matching stream */
+    for(i = 0; i < s->nb_streams; i++) {
+        st = s->streams[i];
+        rtsp_st = st->priv_data;
+        if (i >= rtsp_st->interleaved_min && 
+            i <= rtsp_st->interleaved_max) 
+            goto found;
+    }
+    goto redo;
+ found:
+    ret = rtp_parse_packet(rtsp_st->ic, pkt, buf, len);
+    if (ret < 0)
+        goto redo;
+    pkt->stream_index = i;
+    return ret;
+}
+
+/* NOTE: output one packet at a time. May need to add a small fifo */
+static int udp_read_packet(AVFormatContext *s,
+                           AVPacket *pkt)
+{
+    AVFormatContext *ic;
+    AVStream *st;
+    RTSPStream *rtsp_st;
+    fd_set rfds;
+    int fd1, fd2, fd_max, n, i, ret;
+    char buf[RTP_MAX_PACKET_LENGTH];
+    struct timeval tv;
+
+    for(;;) {
+        if (rtsp_abort_req)
+            return -EIO;
+        FD_ZERO(&rfds);
+        fd_max = -1;
+        for(i = 0; i < s->nb_streams; i++) {
+            st = s->streams[i];
+            rtsp_st = st->priv_data;
+            ic = rtsp_st->ic;
+            /* currently, we cannot probe RTCP handle because of blocking restrictions */
+            rtp_get_file_handles(url_fileno(&ic->pb), &fd1, &fd2);
+            if (fd1 > fd_max)
+                fd_max = fd1;
+            FD_SET(fd1, &rfds);
+        }
+        /* XXX: also add proper API to abort */
+        tv.tv_sec = 0;
+        tv.tv_usec = 500000;
+        n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
+        if (n > 0) {
+            for(i = 0; i < s->nb_streams; i++) {
+                st = s->streams[i];
+                rtsp_st = st->priv_data;
+                ic = rtsp_st->ic;
+                rtp_get_file_handles(url_fileno(&ic->pb), &fd1, &fd2);
+                if (FD_ISSET(fd1, &rfds)) {
+                    ret = url_read(url_fileno(&ic->pb), buf, sizeof(buf));
+                    if (ret >= 0 && 
+                        rtp_parse_packet(ic, pkt, buf, ret) == 0) {
+                        pkt->stream_index = i;
+                        return ret;
+                    }
+                }
+            }
+        }
+    }
+}
+
+static int rtsp_read_packet(AVFormatContext *s,
+                            AVPacket *pkt)
+{
+    RTSPState *rt = s->priv_data;
+    int ret;
+
+    switch(rt->protocol) {
+    default:
+    case RTSP_PROTOCOL_RTP_TCP:
+        ret = tcp_read_packet(s, pkt);
+        break;
+    case RTSP_PROTOCOL_RTP_UDP:
+        ret = udp_read_packet(s, pkt);
+        break;
+    }
+    return ret;
+}
+
+static int rtsp_read_close(AVFormatContext *s)
+{
+    RTSPState *rt = s->priv_data;
+    AVStream *st;
+    RTSPStream *rtsp_st;
+    RTSPHeader reply1, *reply = &reply1;
+    int i;
+    char cmd[1024];
+
+    /* NOTE: it is valid to flush the buffer here */
+    if (rt->protocol == RTSP_PROTOCOL_RTP_TCP) {
+        url_fclose(&rt->rtsp_gb);
+    }
+
+    snprintf(cmd, sizeof(cmd), 
+             "TEARDOWN %s RTSP/1.0\n",
+             s->filename);
+    rtsp_send_cmd(s, cmd, reply, NULL);
+
+    if (ff_rtsp_callback) {
+        ff_rtsp_callback(RTSP_ACTION_CLIENT_TEARDOWN, rt->session_id, 
+                         NULL, 0, NULL);
+    }
+
+    for(i=0;i<s->nb_streams;i++) {
+        st = s->streams[i];
+        rtsp_st = st->priv_data;
+        if (rtsp_st) {
+            if (rtsp_st->ic)
+                av_close_input_file(rtsp_st->ic);
+        }
+        av_free(rtsp_st);
+    }
+    url_close(rt->rtsp_hd);
+    return 0;
+}
+
+static AVInputFormat rtsp_demux = {
+    "rtsp",
+    "RTSP input format",
+    sizeof(RTSPState),
+    rtsp_probe,
+    rtsp_read_header,
+    rtsp_read_packet,
+    rtsp_read_close,
+    .flags = AVFMT_NOFILE,
+};
+
+static int sdp_probe(AVProbeData *p1)
+{
+    const char *p;
+
+    /* we look for a line beginning "c=IN IP4" */
+    p = p1->buf;
+    while (*p != '\0') {
+        if (strstart(p, "c=IN IP4", NULL))
+            return AVPROBE_SCORE_MAX / 2;
+        p = strchr(p, '\n');
+        if (!p)
+            break;
+        p++;
+        if (*p == '\r')
+            p++;
+    }
+    return 0;
+}
+
+#define SDP_MAX_SIZE 8192
+
+static int sdp_read_header(AVFormatContext *s,
+                           AVFormatParameters *ap)
+{
+    AVStream *st;
+    RTSPStream *rtsp_st;
+    int size, i, err;
+    char *content;
+    char url[1024];
+
+    /* read the whole sdp file */
+    /* XXX: better loading */
+    content = av_malloc(SDP_MAX_SIZE);
+    size = get_buffer(&s->pb, content, SDP_MAX_SIZE - 1);
+    if (size <= 0) {
+        av_free(content);
+        return AVERROR_INVALIDDATA;
+    }
+    content[size] ='\0';
+
+    sdp_parse(s, content);
+    av_free(content);
+
+    /* open each RTP stream */
+    for(i=0;i<s->nb_streams;i++) {
+        st = s->streams[i];
+        rtsp_st = st->priv_data;
+        
+        snprintf(url, sizeof(url), "rtp://%s:%d?multicast=1&ttl=%d", 
+                 inet_ntoa(rtsp_st->sdp_ip), 
+                 rtsp_st->sdp_port,
+                 rtsp_st->sdp_ttl);
+        if (av_open_input_file(&rtsp_st->ic, url, &rtp_demux, 0, NULL) < 0) {
+            err = AVERROR_INVALIDDATA;
+            goto fail;
+        }
+    }
+    return 0;
+ fail:
+    for(i=0;i<s->nb_streams;i++) {
+        st = s->streams[i];
+        rtsp_st = st->priv_data;
+        if (rtsp_st) {
+            if (rtsp_st->ic)
+                av_close_input_file(rtsp_st->ic);
+        }
+        av_free(rtsp_st);
+    }
+    return err;
+}
+
+static int sdp_read_packet(AVFormatContext *s,
+                            AVPacket *pkt)
+{
+    return udp_read_packet(s, pkt);
+}
+
+static int sdp_read_close(AVFormatContext *s)
+{
+    AVStream *st;
+    RTSPStream *rtsp_st;
+    int i;
+
+    for(i=0;i<s->nb_streams;i++) {
+        st = s->streams[i];
+        rtsp_st = st->priv_data;
+        if (rtsp_st) {
+            if (rtsp_st->ic)
+                av_close_input_file(rtsp_st->ic);
+        }
+        av_free(rtsp_st);
+    }
+    return 0;
+}
+
+
+static AVInputFormat sdp_demux = {
+    "sdp",
+    "SDP",
+    sizeof(RTSPState),
+    sdp_probe,
+    sdp_read_header,
+    sdp_read_packet,
+    sdp_read_close,
+};
+
+
+/* dummy redirector format (used directly in av_open_input_file now) */
+static int redir_probe(AVProbeData *pd)
+{
+    const char *p;
+    p = pd->buf;
+    while (redir_isspace(*p))
+        p++;
+    if (strstart(p, "http://", NULL) ||
+        strstart(p, "rtsp://", NULL))
+        return AVPROBE_SCORE_MAX;
+    return 0;
+}
+
+/* called from utils.c */
+int redir_open(AVFormatContext **ic_ptr, ByteIOContext *f)
+{
+    char buf[4096], *q;
+    int c;
+    AVFormatContext *ic = NULL;
+
+    /* parse each URL and try to open it */
+    c = url_fgetc(f);
+    while (c != URL_EOF) {
+        /* skip spaces */
+        for(;;) {
+            if (!redir_isspace(c))
+                break;
+            c = url_fgetc(f);
+        }
+        if (c == URL_EOF)
+            break;
+        /* record url */
+        q = buf;
+        for(;;) {
+            if (c == URL_EOF || redir_isspace(c))
+                break;
+            if ((q - buf) < sizeof(buf) - 1)
+                *q++ = c;
+            c = url_fgetc(f);
+        }
+        *q = '\0';
+        //printf("URL='%s'\n", buf);
+        /* try to open the media file */
+        if (av_open_input_file(&ic, buf, NULL, 0, NULL) == 0)
+            break;
+    }
+    *ic_ptr = ic;
+    if (!ic)
+        return AVERROR_IO;
+    else
+        return 0;
+}
+
+AVInputFormat redir_demux = {
+    "redir",
+    "Redirector format",
+    0,
+    redir_probe,
+    NULL,
+    NULL,
+    NULL,
+};
+
+int rtsp_init(void)
+{
+    av_register_input_format(&rtsp_demux);
+    av_register_input_format(&redir_demux);
+    av_register_input_format(&sdp_demux);
+    return 0;
+}