RTMP protocol support (as a client)

Originally committed as revision 19556 to svn://svn.ffmpeg.org/ffmpeg/trunk

9 files changed, 1219 insertions, 1 deletions

diff --git a/Changelog b/Changelog
index fe181a6fde..2c18d9e7c9 100644
--- a/Changelog
+++ b/Changelog
@@ -29,6 +29,7 @@ version <next>:
 - nonfree libamr support for AMR-NB/WB decoding/encoding removed
 - Experimental AAC encoder
 - RTP depacketization of ASF and RTSP from WMS servers
+- RTMP support in libavformat
 
 
 
diff --git a/doc/general.texi b/doc/general.texi
index 4202c1d220..6326df90ad 100644
--- a/doc/general.texi
+++ b/doc/general.texi
@@ -195,6 +195,7 @@ library:
 @item RL2                       @tab   @tab X
     @tab Audio and video format used in some games by Entertainment Software Partners.
 @item RPL/ARMovie               @tab   @tab X
+@item RTMP                      @tab   @tab X
 @item RTP                       @tab   @tab X
 @item RTSP                      @tab   @tab X
 @item SDP                       @tab   @tab X
diff --git a/libavformat/Makefile b/libavformat/Makefile
index 1447eeb14c..7838efea2f 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -237,6 +237,7 @@ OBJS-$(CONFIG_FILE_PROTOCOL)             += file.o
 OBJS-$(CONFIG_GOPHER_PROTOCOL)           += gopher.o
 OBJS-$(CONFIG_HTTP_PROTOCOL)             += http.o
 OBJS-$(CONFIG_PIPE_PROTOCOL)             += file.o
+OBJS-$(CONFIG_RTMP_PROTOCOL)             += rtmpproto.o rtmppkt.o
 OBJS-$(CONFIG_RTP_PROTOCOL)              += rtpproto.o
 OBJS-$(CONFIG_TCP_PROTOCOL)              += tcp.o
 OBJS-$(CONFIG_UDP_PROTOCOL)              += udp.o
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index ad4763158c..569ef508dc 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -209,6 +209,7 @@ void av_register_all(void)
     REGISTER_PROTOCOL (GOPHER, gopher);
     REGISTER_PROTOCOL (HTTP, http);
     REGISTER_PROTOCOL (PIPE, pipe);
+    REGISTER_PROTOCOL (RTMP, rtmp);
     REGISTER_PROTOCOL (RTP, rtp);
     REGISTER_PROTOCOL (TCP, tcp);
     REGISTER_PROTOCOL (UDP, udp);
diff --git a/libavformat/avformat.h b/libavformat/avformat.h
index 2185edc992..16170d40a8 100644
--- a/libavformat/avformat.h
+++ b/libavformat/avformat.h
@@ -22,7 +22,7 @@
 #define AVFORMAT_AVFORMAT_H
 
 #define LIBAVFORMAT_VERSION_MAJOR 52
-#define LIBAVFORMAT_VERSION_MINOR 36
+#define LIBAVFORMAT_VERSION_MINOR 37
 #define LIBAVFORMAT_VERSION_MICRO  0
 
 #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
diff --git a/libavformat/rtmp.h b/libavformat/rtmp.h
new file mode 100644
index 0000000000..b0436c0391
--- /dev/null
+++ b/libavformat/rtmp.h
@@ -0,0 +1,42 @@
+/*
+ * RTMP definitions
+ * Copyright (c) 2009 Kostya Shishkov
+ *
+ * This file is part of FFmpeg.
+ *
+ * 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.
+ *
+ * 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 FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVFORMAT_RTMP_H
+#define AVFORMAT_RTMP_H
+
+#include "avformat.h"
+
+#define RTMP_DEFAULT_PORT 1935
+
+#define RTMP_HANDSHAKE_PACKET_SIZE 1536
+
+/**
+ * emulated Flash client version - 9.0.124.2 on Linux
+ * @{
+ */
+#define RTMP_CLIENT_PLATFORM "LNX"
+#define RTMP_CLIENT_VER1    9
+#define RTMP_CLIENT_VER2    0
+#define RTMP_CLIENT_VER3  124
+#define RTMP_CLIENT_VER4    2
+/** @} */ //version defines
+
+#endif /* AVFORMAT_RTMP_H */
diff --git a/libavformat/rtmppkt.c b/libavformat/rtmppkt.c
new file mode 100644
index 0000000000..af416a4f1f
--- /dev/null
+++ b/libavformat/rtmppkt.c
@@ -0,0 +1,265 @@
+/*
+ * RTMP input format
+ * Copyright (c) 2009 Kostya Shishkov
+ *
+ * This file is part of FFmpeg.
+ *
+ * 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.
+ *
+ * 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 FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "libavcodec/bytestream.h"
+#include "libavutil/avstring.h"
+#include "avformat.h"
+
+#include "rtmppkt.h"
+#include "flv.h"
+
+void ff_amf_write_bool(uint8_t **dst, int val)
+{
+    bytestream_put_byte(dst, AMF_DATA_TYPE_BOOL);
+    bytestream_put_byte(dst, val);
+}
+
+void ff_amf_write_number(uint8_t **dst, double val)
+{
+    bytestream_put_byte(dst, AMF_DATA_TYPE_NUMBER);
+    bytestream_put_be64(dst, av_dbl2int(val));
+}
+
+void ff_amf_write_string(uint8_t **dst, const char *str)
+{
+    bytestream_put_byte(dst, AMF_DATA_TYPE_STRING);
+    bytestream_put_be16(dst, strlen(str));
+    bytestream_put_buffer(dst, str, strlen(str));
+}
+
+void ff_amf_write_null(uint8_t **dst)
+{
+    bytestream_put_byte(dst, AMF_DATA_TYPE_NULL);
+}
+
+void ff_amf_write_object_start(uint8_t **dst)
+{
+    bytestream_put_byte(dst, AMF_DATA_TYPE_OBJECT);
+}
+
+void ff_amf_write_field_name(uint8_t **dst, const char *str)
+{
+    bytestream_put_be16(dst, strlen(str));
+    bytestream_put_buffer(dst, str, strlen(str));
+}
+
+void ff_amf_write_object_end(uint8_t **dst)
+{
+    /* first two bytes are field name length = 0,
+     * AMF object should end with it and end marker
+     */
+    bytestream_put_be24(dst, AMF_DATA_TYPE_OBJECT_END);
+}
+
+int ff_rtmp_packet_read(URLContext *h, RTMPPacket *p,
+                        int chunk_size, RTMPPacket *prev_pkt)
+{
+    uint8_t hdr, t, buf[16];
+    int channel_id, timestamp, data_size, offset = 0;
+    uint32_t extra = 0;
+    uint8_t type;
+
+    if (url_read(h, &hdr, 1) != 1)
+        return AVERROR(EIO);
+    channel_id = hdr & 0x3F;
+
+    data_size = prev_pkt[channel_id].data_size;
+    type      = prev_pkt[channel_id].type;
+    extra     = prev_pkt[channel_id].extra;
+
+    hdr >>= 6;
+    if (hdr == RTMP_PS_ONEBYTE) {
+        //todo
+        return -1;
+    } else {
+        if (url_read_complete(h, buf, 3) != 3)
+            return AVERROR(EIO);
+        timestamp = AV_RB24(buf);
+        if (hdr != RTMP_PS_FOURBYTES) {
+            if (url_read_complete(h, buf, 3) != 3)
+                return AVERROR(EIO);
+            data_size = AV_RB24(buf);
+            if (url_read_complete(h, &type, 1) != 1)
+                return AVERROR(EIO);
+            if (hdr == RTMP_PS_TWELVEBYTES) {
+                if (url_read_complete(h, buf, 4) != 4)
+                    return AVERROR(EIO);
+                extra = AV_RL32(buf);
+            }
+        }
+    }
+    if (ff_rtmp_packet_create(p, channel_id, type, timestamp, data_size))
+        return -1;
+    p->extra = extra;
+    // save history
+    prev_pkt[channel_id].channel_id = channel_id;
+    prev_pkt[channel_id].type       = type;
+    prev_pkt[channel_id].data_size  = data_size;
+    prev_pkt[channel_id].timestamp  = timestamp;
+    prev_pkt[channel_id].extra      = extra;
+    while (data_size > 0) {
+        int toread = FFMIN(data_size, chunk_size);
+        if (url_read_complete(h, p->data + offset, toread) != toread) {
+            ff_rtmp_packet_destroy(p);
+            return AVERROR(EIO);
+        }
+        data_size -= chunk_size;
+        offset    += chunk_size;
+        if (data_size > 0) {
+            url_read_complete(h, &t, 1); //marker
+            if (t != (0xC0 + channel_id))
+                return -1;
+        }
+    }
+    return 0;
+}
+
+int ff_rtmp_packet_write(URLContext *h, RTMPPacket *pkt,
+                         int chunk_size, RTMPPacket *prev_pkt)
+{
+    uint8_t pkt_hdr[16], *p = pkt_hdr;
+    int mode = RTMP_PS_TWELVEBYTES;
+    int off = 0;
+
+    //TODO: header compression
+    bytestream_put_byte(&p, pkt->channel_id | (mode << 6));
+    if (mode != RTMP_PS_ONEBYTE) {
+        bytestream_put_be24(&p, pkt->timestamp);
+        if (mode != RTMP_PS_FOURBYTES) {
+            bytestream_put_be24(&p, pkt->data_size);
+            bytestream_put_byte(&p, pkt->type);
+            if (mode == RTMP_PS_TWELVEBYTES)
+                bytestream_put_le32(&p, pkt->extra);
+        }
+    }
+    url_write(h, pkt_hdr, p-pkt_hdr);
+    while (off < pkt->data_size) {
+        int towrite = FFMIN(chunk_size, pkt->data_size - off);
+        url_write(h, pkt->data + off, towrite);
+        off += towrite;
+        if (off < pkt->data_size) {
+            uint8_t marker = 0xC0 | pkt->channel_id;
+            url_write(h, &marker, 1);
+        }
+    }
+    return 0;
+}
+
+int ff_rtmp_packet_create(RTMPPacket *pkt, int channel_id, RTMPPacketType type,
+                          int timestamp, int size)
+{
+    pkt->data = av_malloc(size);
+    if (!pkt->data)
+        return AVERROR(ENOMEM);
+    pkt->data_size  = size;
+    pkt->channel_id = channel_id;
+    pkt->type       = type;
+    pkt->timestamp  = timestamp;
+    pkt->extra      = 0;
+
+    return 0;
+}
+
+void ff_rtmp_packet_destroy(RTMPPacket *pkt)
+{
+    if (!pkt)
+        return;
+    av_freep(&pkt->data);
+    pkt->data_size = 0;
+}
+
+int ff_amf_tag_size(const uint8_t *data, const uint8_t *data_end)
+{
+    const uint8_t *base = data;
+
+    if (data >= data_end)
+        return -1;
+    switch (*data++) {
+    case AMF_DATA_TYPE_NUMBER:      return 9;
+    case AMF_DATA_TYPE_BOOL:        return 2;
+    case AMF_DATA_TYPE_STRING:      return 3 + AV_RB16(data);
+    case AMF_DATA_TYPE_LONG_STRING: return 5 + AV_RB32(data);
+    case AMF_DATA_TYPE_NULL:        return 1;
+    case AMF_DATA_TYPE_ARRAY:
+        data += 4;
+    case AMF_DATA_TYPE_OBJECT:
+        for (;;) {
+            int size = bytestream_get_be16(&data);
+            int t;
+            if (!size) {
+                data++;
+                break;
+            }
+            if (data + size >= data_end || data + size < data)
+                return -1;
+            data += size;
+            t = ff_amf_tag_size(data, data_end);
+            if (t < 0 || data + t >= data_end)
+                return -1;
+            data += t;
+        }
+        return data - base;
+    case AMF_DATA_TYPE_OBJECT_END:  return 1;
+    default:                        return -1;
+    }
+}
+
+int ff_amf_get_field_value(const uint8_t *data, const uint8_t *data_end,
+                           const uint8_t *name, uint8_t *dst, int dst_size)
+{
+    int namelen = strlen(name);
+    int len;
+
+    if (data_end - data < 3)
+        return -1;
+    if (*data++ != AMF_DATA_TYPE_OBJECT)
+        return -1;
+    for (;;) {
+        int size = bytestream_get_be16(&data);
+        if (!size)
+            break;
+        if (data + size >= data_end || data + size < data)
+            return -1;
+        data += size;
+        if (size == namelen && !memcmp(data-size, name, namelen)) {
+            switch (*data++) {
+            case AMF_DATA_TYPE_NUMBER:
+                snprintf(dst, dst_size, "%g", av_int2dbl(AV_RB64(data)));
+                break;
+            case AMF_DATA_TYPE_BOOL:
+                snprintf(dst, dst_size, "%s", *data ? "true" : "false");
+                break;
+            case AMF_DATA_TYPE_STRING:
+                len = bytestream_get_be16(&data);
+                av_strlcpy(dst, data, FFMIN(len+1, dst_size));
+                break;
+            default:
+                return -1;
+            }
+            return 0;
+        }
+        len = ff_amf_tag_size(data, data_end);
+        if (len < 0 || data + len >= data_end || data + len < data)
+            return -1;
+        data += len;
+    }
+    return -1;
+}
diff --git a/libavformat/rtmppkt.h b/libavformat/rtmppkt.h
new file mode 100644
index 0000000000..b40f4fe061
--- /dev/null
+++ b/libavformat/rtmppkt.h
@@ -0,0 +1,212 @@
+/*
+ * RTMP packet utilities
+ * Copyright (c) 2009 Kostya Shishkov
+ *
+ * This file is part of FFmpeg.
+ *
+ * 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.
+ *
+ * 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 FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVFORMAT_RTMPPKT_H
+#define AVFORMAT_RTMPPKT_H
+
+#include "avformat.h"
+
+/** maximum possible number of different RTMP channels */
+#define RTMP_CHANNELS 64
+
+/**
+ * channels used to for RTMP packets with different purposes (i.e. data, network
+ * control, remote procedure calls, etc.)
+ */
+enum RTMPChannel {
+    RTMP_NETWORK_CHANNEL = 2,   ///< channel for network-related messages (bandwidth report, ping, etc)
+    RTMP_SYSTEM_CHANNEL,        ///< channel for sending server control messages
+    RTMP_VIDEO_CHANNEL = 8,     ///< channel for video data
+    RTMP_AUDIO_CHANNEL,         ///< channel for audio data
+};
+
+/**
+ * known RTMP packet types
+ */
+typedef enum RTMPPacketType {
+    RTMP_PT_CHUNK_SIZE   =  1,  ///< chunk size change
+    RTMP_PT_BYTES_READ   =  3,  ///< number of bytes read
+    RTMP_PT_PING,               ///< ping
+    RTMP_PT_SERVER_BW,          ///< server bandwidth
+    RTMP_PT_CLIENT_BW,          ///< client bandwidth
+    RTMP_PT_AUDIO        =  8,  ///< audio packet
+    RTMP_PT_VIDEO,              ///< video packet
+    RTMP_PT_FLEX_STREAM  = 15,  ///< Flex shared stream
+    RTMP_PT_FLEX_OBJECT,        ///< Flex shared object
+    RTMP_PT_FLEX_MESSAGE,       ///< Flex shared message
+    RTMP_PT_NOTIFY,             ///< some notification
+    RTMP_PT_SHARED_OBJ,         ///< shared object
+    RTMP_PT_INVOKE,             ///< invoke some stream action
+    RTMP_PT_METADATA     = 22,  ///< FLV metadata
+} RTMPPacketType;
+
+/**
+ * possible RTMP packet header sizes
+ */
+enum RTMPPacketSize {
+    RTMP_PS_TWELVEBYTES = 0, ///< packet has 12-byte header
+    RTMP_PS_EIGHTBYTES,      ///< packet has 8-byte header
+    RTMP_PS_FOURBYTES,       ///< packet has 4-byte header
+    RTMP_PS_ONEBYTE          ///< packet is really a next chunk of a packet
+};
+
+/**
+ * structure for holding RTMP packets
+ */
+typedef struct RTMPPacket {
+    uint8_t        channel_id; ///< RTMP channel ID (nothing to do with audio/video channels though)
+    RTMPPacketType type;       ///< packet payload type
+    uint32_t       timestamp;  ///< packet full timestamp or timestamp increment to the previous one in milliseconds (latter only for media packets)
+    uint32_t       extra;      ///< probably an additional channel ID used during streaming data
+    uint8_t        *data;      ///< packet payload
+    int            data_size;  ///< packet payload size
+} RTMPPacket;
+
+/**
+ * Creates new RTMP packet with given attributes.
+ *
+ * @param pkt        packet
+ * @param channel_id packet channel ID
+ * @param type       packet type
+ * @param timestamp  packet timestamp
+ * @param size       packet size
+ * @return zero on success, negative value otherwise
+ */
+int ff_rtmp_packet_create(RTMPPacket *pkt, int channel_id, RTMPPacketType type,
+                          int timestamp, int size);
+
+/**
+ * Frees RTMP packet.
+ *
+ * @param pkt packet
+ */
+void ff_rtmp_packet_destroy(RTMPPacket *pkt);
+
+/**
+ * Reads RTMP packet sent by the server.
+ *
+ * @param h          reader context
+ * @param p          packet
+ * @param chunk_size current chunk size
+ * @param prev_pkt   previously read packet headers for all channels
+ *                   (may be needed for restoring incomplete packet header)
+ * @return zero on success, negative value otherwise
+ */
+int ff_rtmp_packet_read(URLContext *h, RTMPPacket *p,
+                        int chunk_size, RTMPPacket *prev_pkt);
+
+/**
+ * Sends RTMP packet to the server.
+ *
+ * @param h          reader context
+ * @param p          packet to send
+ * @param chunk_size current chunk size
+ * @param prev_pkt   previously sent packet headers for all channels
+ *                   (may be used for packet header compressing)
+ * @return zero on success, negative value otherwise
+ */
+int ff_rtmp_packet_write(URLContext *h, RTMPPacket *p,
+                         int chunk_size, RTMPPacket *prev_pkt);
+
+/**
+ * @defgroup amffuncs functions used to work with AMF format (which is also used in .flv)
+ * @see amf_* funcs in libavformat/flvdec.c
+ * @{
+ */
+
+/**
+ * Calculates number of bytes taken by first AMF entry in data.
+ *
+ * @param data input data
+ * @param data_end input buffer end
+ * @return number of bytes used by first AMF entry
+ */
+int ff_amf_tag_size(const uint8_t *data, const uint8_t *data_end);
+
+/**
+ * Retrieves value of given AMF object field in string form.
+ *
+ * @param data     AMF object data
+ * @param data_end input buffer end
+ * @param name     name of field to retrieve
+ * @param dst      buffer for storing result
+ * @param dst_size output buffer size
+ * @return 0 if search and retrieval succeeded, negative value otherwise
+ */
+int ff_amf_get_field_value(const uint8_t *data, const uint8_t *data_end,
+                           const uint8_t *name, uint8_t *dst, int dst_size);
+
+/**
+ * Writes boolean value in AMF format to buffer.
+ *
+ * @param dst pointer to the input buffer (will be modified)
+ * @param val value to write
+ */
+void ff_amf_write_bool(uint8_t **dst, int val);
+
+/**
+ * Writes number in AMF format to buffer.
+ *
+ * @param dst pointer to the input buffer (will be modified)
+ * @param num value to write
+ */
+void ff_amf_write_number(uint8_t **dst, double num);
+
+/**
+ * Writes string in AMF format to buffer.
+ *
+ * @param dst pointer to the input buffer (will be modified)
+ * @param str string to write
+ */
+void ff_amf_write_string(uint8_t **dst, const char *str);
+
+/**
+ * Writes AMF NULL value to buffer.
+ *
+ * @param dst pointer to the input buffer (will be modified)
+ */
+void ff_amf_write_null(uint8_t **dst);
+
+/**
+ * Writes marker for AMF object to buffer.
+ *
+ * @param dst pointer to the input buffer (will be modified)
+ */
+void ff_amf_write_object_start(uint8_t **dst);
+
+/**
+ * Writes string used as field name in AMF object to buffer.
+ *
+ * @param dst pointer to the input buffer (will be modified)
+ * @param str string to write
+ */
+void ff_amf_write_field_name(uint8_t **dst, const char *str);
+
+/**
+ * Writes marker for end of AMF object to buffer.
+ *
+ * @param dst pointer to the input buffer (will be modified)
+ */
+void ff_amf_write_object_end(uint8_t **dst);
+
+/** @} */ // AMF funcs
+
+#endif /* AVFORMAT_RTMPPKT_H */
diff --git a/libavformat/rtmpproto.c b/libavformat/rtmpproto.c
new file mode 100644
index 0000000000..470e6fef87
--- /dev/null
+++ b/libavformat/rtmpproto.c
@@ -0,0 +1,695 @@
+/*
+ * RTMP network protocol
+ * Copyright (c) 2009 Kostya Shishkov
+ *
+ * This file is part of FFmpeg.
+ *
+ * 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.
+ *
+ * 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 FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file libavformat/rtmpproto.c
+ * RTMP protocol
+ */
+
+#include "libavcodec/bytestream.h"
+#include "libavutil/avstring.h"
+#include "libavutil/lfg.h"
+#include "libavutil/sha.h"
+#include "avformat.h"
+
+#include "network.h"
+
+#include "flv.h"
+#include "rtmp.h"
+#include "rtmppkt.h"
+
+/* we can't use av_log() with URLContext yet... */
+#if LIBAVFORMAT_VERSION_MAJOR < 53
+#define LOG_CONTEXT NULL
+#else
+#define LOG_CONTEXT s
+#endif
+
+/** RTMP protocol handler state */
+typedef enum {
+    STATE_START,      ///< client has not done anything yet
+    STATE_HANDSHAKED, ///< client has performed handshake
+    STATE_CONNECTING, ///< client connected to server successfully
+    STATE_READY,      ///< client has sent all needed commands and waits for server reply
+    STATE_PLAYING,    ///< client has started receiving multimedia data from server
+} ClientState;
+
+/** protocol handler context */
+typedef struct RTMPContext {
+    URLContext*   stream;                     ///< TCP stream used in interactions with RTMP server
+    RTMPPacket    prev_pkt[2][RTMP_CHANNELS]; ///< packet history used when reading and sending packets
+    int           chunk_size;                 ///< size of the chunks RTMP packets are divided into
+    char          playpath[256];              ///< path to filename to play (with possible "mp4:" prefix)
+    ClientState   state;                      ///< current state
+    int           main_channel_id;            ///< an additional channel ID which is used for some invocations
+    uint8_t*      flv_data;                   ///< buffer with data for demuxer
+    int           flv_size;                   ///< current buffer size
+    int           flv_off;                    ///< number of bytes read from current buffer
+    uint32_t      video_ts;                   ///< current video timestamp in milliseconds
+    uint32_t      audio_ts;                   ///< current audio timestamp in milliseconds
+} RTMPContext;
+
+#define PLAYER_KEY_OPEN_PART_LEN 30   ///< length of partial key used for first client digest signing
+/** Client key used for digest signing */
+static const uint8_t rtmp_player_key[] = {
+    'G', 'e', 'n', 'u', 'i', 'n', 'e', ' ', 'A', 'd', 'o', 'b', 'e', ' ',
+    'F', 'l', 'a', 's', 'h', ' ', 'P', 'l', 'a', 'y', 'e', 'r', ' ', '0', '0', '1',
+
+    0xF0, 0xEE, 0xC2, 0x4A, 0x80, 0x68, 0xBE, 0xE8, 0x2E, 0x00, 0xD0, 0xD1, 0x02,
+    0x9E, 0x7E, 0x57, 0x6E, 0xEC, 0x5D, 0x2D, 0x29, 0x80, 0x6F, 0xAB, 0x93, 0xB8,
+    0xE6, 0x36, 0xCF, 0xEB, 0x31, 0xAE
+};
+
+#define SERVER_KEY_OPEN_PART_LEN 36   ///< length of partial key used for first server digest signing
+/** Key used for RTMP server digest signing */
+static const uint8_t rtmp_server_key[] = {
+    'G', 'e', 'n', 'u', 'i', 'n', 'e', ' ', 'A', 'd', 'o', 'b', 'e', ' ',
+    'F', 'l', 'a', 's', 'h', ' ', 'M', 'e', 'd', 'i', 'a', ' ',
+    'S', 'e', 'r', 'v', 'e', 'r', ' ', '0', '0', '1',
+
+    0xF0, 0xEE, 0xC2, 0x4A, 0x80, 0x68, 0xBE, 0xE8, 0x2E, 0x00, 0xD0, 0xD1, 0x02,
+    0x9E, 0x7E, 0x57, 0x6E, 0xEC, 0x5D, 0x2D, 0x29, 0x80, 0x6F, 0xAB, 0x93, 0xB8,
+    0xE6, 0x36, 0xCF, 0xEB, 0x31, 0xAE
+};
+
+/**
+ * Generates 'connect' call and sends it to the server.
+ */
+static void gen_connect(URLContext *s, RTMPContext *rt, const char *proto,
+                        const char *host, int port, const char *app)
+{
+    RTMPPacket pkt;
+    uint8_t ver[32], *p;
+    char tcurl[512];
+
+    ff_rtmp_packet_create(&pkt, RTMP_VIDEO_CHANNEL, RTMP_PT_INVOKE, 0, 4096);
+    p = pkt.data;
+
+    snprintf(tcurl, sizeof(tcurl), "%s://%s:%d/%s", proto, host, port, app);
+    ff_amf_write_string(&p, "connect");
+    ff_amf_write_number(&p, 1.0);
+    ff_amf_write_object_start(&p);
+    ff_amf_write_field_name(&p, "app");
+    ff_amf_write_string(&p, app);
+
+    snprintf(ver, sizeof(ver), "%s %d,%d,%d,%d", RTMP_CLIENT_PLATFORM, RTMP_CLIENT_VER1,
+             RTMP_CLIENT_VER2, RTMP_CLIENT_VER3, RTMP_CLIENT_VER4);
+    ff_amf_write_field_name(&p, "flashVer");
+    ff_amf_write_string(&p, ver);
+    ff_amf_write_field_name(&p, "tcUrl");
+    ff_amf_write_string(&p, tcurl);
+    ff_amf_write_field_name(&p, "fpad");
+    ff_amf_write_bool(&p, 0);
+    ff_amf_write_field_name(&p, "capabilities");
+    ff_amf_write_number(&p, 15.0);
+    ff_amf_write_field_name(&p, "audioCodecs");
+    ff_amf_write_number(&p, 1639.0);
+    ff_amf_write_field_name(&p, "videoCodecs");
+    ff_amf_write_number(&p, 252.0);
+    ff_amf_write_field_name(&p, "videoFunction");
+    ff_amf_write_number(&p, 1.0);
+    ff_amf_write_object_end(&p);
+
+    pkt.data_size = p - pkt.data;
+
+    ff_rtmp_packet_write(rt->stream, &pkt, rt->chunk_size, rt->prev_pkt[1]);
+}
+
+/**
+ * Generates 'createStream' call and sends it to the server. It should make
+ * the server allocate some channel for media streams.
+ */
+static void gen_create_stream(URLContext *s, RTMPContext *rt)
+{
+    RTMPPacket pkt;
+    uint8_t *p;
+
+    av_log(LOG_CONTEXT, AV_LOG_DEBUG, "Creating stream...\n");
+    ff_rtmp_packet_create(&pkt, RTMP_VIDEO_CHANNEL, RTMP_PT_INVOKE, 0, 25);
+
+    p = pkt.data;
+    ff_amf_write_string(&p, "createStream");
+    ff_amf_write_number(&p, 3.0);
+    ff_amf_write_null(&p);
+
+    ff_rtmp_packet_write(rt->stream, &pkt, rt->chunk_size, rt->prev_pkt[1]);
+    ff_rtmp_packet_destroy(&pkt);
+}
+
+/**
+ * Generates 'play' call and sends it to the server, then pings the server
+ * to start actual playing.
+ */
+static void gen_play(URLContext *s, RTMPContext *rt)
+{
+    RTMPPacket pkt;
+    uint8_t *p;
+
+    av_log(LOG_CONTEXT, AV_LOG_DEBUG, "Sending play command for '%s'\n", rt->playpath);
+    ff_rtmp_packet_create(&pkt, RTMP_VIDEO_CHANNEL, RTMP_PT_INVOKE, 0,
+                          29 + strlen(rt->playpath));
+    pkt.extra = rt->main_channel_id;
+
+    p = pkt.data;
+    ff_amf_write_string(&p, "play");
+    ff_amf_write_number(&p, 0.0);
+    ff_amf_write_null(&p);
+    ff_amf_write_string(&p, rt->playpath);
+    ff_amf_write_number(&p, 0.0);
+
+    ff_rtmp_packet_write(rt->stream, &pkt, rt->chunk_size, rt->prev_pkt[1]);
+    ff_rtmp_packet_destroy(&pkt);
+
+    // set client buffer time disguised in ping packet
+    ff_rtmp_packet_create(&pkt, RTMP_NETWORK_CHANNEL, RTMP_PT_PING, 1, 10);
+
+    p = pkt.data;
+    bytestream_put_be16(&p, 3);
+    bytestream_put_be32(&p, 1);
+    bytestream_put_be32(&p, 256); //TODO: what is a good value here?
+
+    ff_rtmp_packet_write(rt->stream, &pkt, rt->chunk_size, rt->prev_pkt[1]);
+    ff_rtmp_packet_destroy(&pkt);
+}
+
+/**
+ * Generates ping reply and sends it to the server.
+ */
+static void gen_pong(URLContext *s, RTMPContext *rt, RTMPPacket *ppkt)
+{
+    RTMPPacket pkt;
+    uint8_t *p;
+
+    ff_rtmp_packet_create(&pkt, RTMP_NETWORK_CHANNEL, RTMP_PT_PING, ppkt->timestamp + 1, 6);
+    p = pkt.data;
+    bytestream_put_be16(&p, 7);
+    bytestream_put_be32(&p, AV_RB32(ppkt->data+2) + 1);
+    ff_rtmp_packet_write(rt->stream, &pkt, rt->chunk_size, rt->prev_pkt[1]);
+    ff_rtmp_packet_destroy(&pkt);
+}
+
+//TODO: Move HMAC code somewhere. Eventually.
+#define HMAC_IPAD_VAL 0x36
+#define HMAC_OPAD_VAL 0x5C
+
+/**
+ * Calculates HMAC-SHA2 digest for RTMP handshake packets.
+ *
+ * @param src    input buffer
+ * @param len    input buffer length (should be 1536)
+ * @param gap    offset in buffer where 32 bytes should not be taken into account
+ *               when calculating digest (since it will be used to store that digest)
+ * @param key    digest key
+ * @param keylen digest key length
+ * @param dst    buffer where calculated digest will be stored (32 bytes)
+ */
+static void rtmp_calc_digest(const uint8_t *src, int len, int gap,
+                             const uint8_t *key, int keylen, uint8_t *dst)
+{
+    struct AVSHA *sha;
+    uint8_t hmac_buf[64+32] = {0};
+    int i;
+
+    sha = av_mallocz(av_sha_size);
+
+    if (keylen < 64) {
+        memcpy(hmac_buf, key, keylen);
+    } else {
+        av_sha_init(sha, 256);
+        av_sha_update(sha,key, keylen);
+        av_sha_final(sha, hmac_buf);
+    }
+    for (i = 0; i < 64; i++)
+        hmac_buf[i] ^= HMAC_IPAD_VAL;
+
+    av_sha_init(sha, 256);
+    av_sha_update(sha, hmac_buf, 64);
+    if (gap <= 0) {
+        av_sha_update(sha, src, len);
+    } else { //skip 32 bytes used for storing digest
+        av_sha_update(sha, src, gap);
+        av_sha_update(sha, src + gap + 32, len - gap - 32);
+    }
+    av_sha_final(sha, hmac_buf + 64);
+
+    for (i = 0; i < 64; i++)
+        hmac_buf[i] ^= HMAC_IPAD_VAL ^ HMAC_OPAD_VAL; //reuse XORed key for opad
+    av_sha_init(sha, 256);
+    av_sha_update(sha, hmac_buf, 64+32);
+    av_sha_final(sha, dst);
+
+    av_free(sha);
+}
+
+/**
+ * Puts HMAC-SHA2 digest of packet data (except for the bytes where this digest
+ * will be stored) into that packet.
+ *
+ * @param buf handshake data (1536 bytes)
+ * @return offset to the digest inside input data
+ */
+static int rtmp_handshake_imprint_with_digest(uint8_t *buf)
+{
+    int i, digest_pos = 0;
+
+    for (i = 8; i < 12; i++)
+        digest_pos += buf[i];
+    digest_pos = (digest_pos % 728) + 12;
+
+    rtmp_calc_digest(buf, RTMP_HANDSHAKE_PACKET_SIZE, digest_pos,
+                     rtmp_player_key, PLAYER_KEY_OPEN_PART_LEN,
+                     buf + digest_pos);
+    return digest_pos;
+}
+
+/**
+ * Verifies that the received server response has the expected digest value.
+ *
+ * @param buf handshake data received from the server (1536 bytes)
+ * @param off position to search digest offset from
+ * @return 0 if digest is valid, digest position otherwise
+ */
+static int rtmp_validate_digest(uint8_t *buf, int off)
+{
+    int i, digest_pos = 0;
+    uint8_t digest[32];
+
+    for (i = 0; i < 4; i++)
+        digest_pos += buf[i + off];
+    digest_pos = (digest_pos % 728) + off + 4;
+
+    rtmp_calc_digest(buf, RTMP_HANDSHAKE_PACKET_SIZE, digest_pos,
+                     rtmp_server_key, SERVER_KEY_OPEN_PART_LEN,
+                     digest);
+    if (!memcmp(digest, buf + digest_pos, 32))
+        return digest_pos;
+    return 0;
+}
+
+/**
+ * Performs handshake with the server by means of exchanging pseudorandom data
+ * signed with HMAC-SHA2 digest.
+ *
+ * @return 0 if handshake succeeds, negative value otherwise
+ */
+static int rtmp_handshake(URLContext *s, RTMPContext *rt)
+{
+    AVLFG rnd;
+    uint8_t tosend    [RTMP_HANDSHAKE_PACKET_SIZE+1] = {
+        3,                // unencrypted data
+        0, 0, 0, 0,       // client uptime
+        RTMP_CLIENT_VER1,
+        RTMP_CLIENT_VER2,
+        RTMP_CLIENT_VER3,
+        RTMP_CLIENT_VER4,
+    };
+    uint8_t clientdata[RTMP_HANDSHAKE_PACKET_SIZE];
+    uint8_t serverdata[RTMP_HANDSHAKE_PACKET_SIZE+1];
+    int i;
+    int server_pos, client_pos;
+    uint8_t digest[32];
+
+    av_log(LOG_CONTEXT, AV_LOG_DEBUG, "Handshaking...\n");
+
+    av_lfg_init(&rnd, 0xDEADC0DE);
+    // generate handshake packet - 1536 bytes of pseudorandom data
+    for (i = 9; i <= RTMP_HANDSHAKE_PACKET_SIZE; i++)
+        tosend[i] = av_lfg_get(&rnd) >> 24;
+    client_pos = rtmp_handshake_imprint_with_digest(tosend + 1);
+
+    url_write(rt->stream, tosend, RTMP_HANDSHAKE_PACKET_SIZE + 1);
+    i = url_read_complete(rt->stream, serverdata, RTMP_HANDSHAKE_PACKET_SIZE + 1);
+    if (i != RTMP_HANDSHAKE_PACKET_SIZE + 1) {
+        av_log(LOG_CONTEXT, AV_LOG_ERROR, "Cannot read RTMP handshake response\n");
+        return -1;
+    }
+    i = url_read_complete(rt->stream, clientdata, RTMP_HANDSHAKE_PACKET_SIZE);
+    if (i != RTMP_HANDSHAKE_PACKET_SIZE) {
+        av_log(LOG_CONTEXT, AV_LOG_ERROR, "Cannot read RTMP handshake response\n");
+        return -1;
+    }
+
+    av_log(LOG_CONTEXT, AV_LOG_DEBUG, "Server version %d.%d.%d.%d\n",
+           serverdata[5], serverdata[6], serverdata[7], serverdata[8]);
+
+    server_pos = rtmp_validate_digest(serverdata + 1, 772);
+    if (!server_pos) {
+        server_pos = rtmp_validate_digest(serverdata + 1, 8);
+        if (!server_pos) {
+            av_log(LOG_CONTEXT, AV_LOG_ERROR, "Server response validating failed\n");
+            return -1;
+        }
+    }
+
+    rtmp_calc_digest(tosend + 1 + client_pos, 32, 0,
+                     rtmp_server_key, sizeof(rtmp_server_key),
+                     digest);
+    rtmp_calc_digest(clientdata, RTMP_HANDSHAKE_PACKET_SIZE-32, 0,
+                     digest, 32,
+                     digest);
+    if (memcmp(digest, clientdata + RTMP_HANDSHAKE_PACKET_SIZE - 32, 32)) {
+        av_log(LOG_CONTEXT, AV_LOG_ERROR, "Signature mismatch\n");
+        return -1;
+    }
+
+    for (i = 0; i < RTMP_HANDSHAKE_PACKET_SIZE; i++)
+        tosend[i] = av_lfg_get(&rnd) >> 24;
+    rtmp_calc_digest(serverdata + 1 + server_pos, 32, 0,
+                     rtmp_player_key, sizeof(rtmp_player_key),
+                     digest);
+    rtmp_calc_digest(tosend,  RTMP_HANDSHAKE_PACKET_SIZE - 32, 0,
+                     digest, 32,
+                     tosend + RTMP_HANDSHAKE_PACKET_SIZE - 32);
+
+    // write reply back to the server
+    url_write(rt->stream, tosend, RTMP_HANDSHAKE_PACKET_SIZE);
+    return 0;
+}
+
+/**
+ * Parses received packet and may perform some action depending on
+ * the packet contents.
+ * @return 0 for no errors, negative values for serious errors which prevent
+ *         further communications, positive values for uncritical errors
+ */
+static int rtmp_parse_result(URLContext *s, RTMPContext *rt, RTMPPacket *pkt)
+{
+    int i, t;
+    const uint8_t *data_end = pkt->data + pkt->data_size;
+
+    switch (pkt->type) {
+    case RTMP_PT_CHUNK_SIZE:
+        if (pkt->data_size != 4) {
+            av_log(LOG_CONTEXT, AV_LOG_ERROR,
+                   "Chunk size change packet is not 4 bytes long (%d)\n", pkt->data_size);
+            return -1;
+        }
+        rt->chunk_size = AV_RB32(pkt->data);
+        if (rt->chunk_size <= 0) {
+            av_log(LOG_CONTEXT, AV_LOG_ERROR, "Incorrect chunk size %d\n", rt->chunk_size);
+            return -1;
+        }
+        av_log(LOG_CONTEXT, AV_LOG_DEBUG, "New chunk size = %d\n", rt->chunk_size);
+        break;
+    case RTMP_PT_PING:
+        t = AV_RB16(pkt->data);
+        if (t == 6)
+            gen_pong(s, rt, pkt);
+        break;
+    case RTMP_PT_INVOKE:
+        //TODO: check for the messages sent for wrong state?
+        if (!memcmp(pkt->data, "\002\000\006_error", 9)) {
+            uint8_t tmpstr[256];
+
+            if (!ff_amf_get_field_value(pkt->data + 9, data_end,
+                                        "description", tmpstr, sizeof(tmpstr)))
+                av_log(LOG_CONTEXT, AV_LOG_ERROR, "Server error: %s\n",tmpstr);
+            return -1;
+        } else if (!memcmp(pkt->data, "\002\000\007_result", 10)) {
+            switch (rt->state) {
+            case STATE_HANDSHAKED:
+                gen_create_stream(s, rt);
+                rt->state = STATE_CONNECTING;
+                break;
+            case STATE_CONNECTING:
+                //extract a number from the result
+                if (pkt->data[10] || pkt->data[19] != 5 || pkt->data[20]) {
+                    av_log(LOG_CONTEXT, AV_LOG_WARNING, "Unexpected reply on connect()\n");
+                } else {
+                    rt->main_channel_id = (int) av_int2dbl(AV_RB64(pkt->data + 21));
+                }
+                gen_play(s, rt);
+                rt->state = STATE_READY;
+                break;
+            }
+        } else if (!memcmp(pkt->data, "\002\000\010onStatus", 11)) {
+            const uint8_t* ptr = pkt->data + 11;
+            uint8_t tmpstr[256];
+            int t;
+
+            for (i = 0; i < 2; i++) {
+                t = ff_amf_tag_size(ptr, data_end);
+                if (t < 0)
+                    return 1;
+                ptr += t;
+            }
+            t = ff_amf_get_field_value(ptr, data_end,
+                                       "level", tmpstr, sizeof(tmpstr));
+            if (!t && !strcmp(tmpstr, "error")) {
+                if (!ff_amf_get_field_value(ptr, data_end,
+                                            "description", tmpstr, sizeof(tmpstr)))
+                    av_log(LOG_CONTEXT, AV_LOG_ERROR, "Server error: %s\n",tmpstr);
+                return -1;
+            }
+            t = ff_amf_get_field_value(ptr, data_end,
+                                       "code", tmpstr, sizeof(tmpstr));
+            if (!t && !strcmp(tmpstr, "NetStream.Play.Start")) {
+                rt->state = STATE_PLAYING;
+                return 0;
+            }
+        }
+        break;
+    }
+    return 0;
+}
+
+/**
+ * Interacts with the server by receiving and sending RTMP packets until
+ * there is some significant data (media data or expected status notification).
+ *
+ * @param s          reading context
+ * @param for_header non-zero value tells function to work until it gets notification from the server that playing has been started, otherwise function will work until some media data is received (or an error happens)
+ * @return 0 for successful operation, negative value in case of error
+ */
+static int get_packet(URLContext *s, int for_header)
+{
+    RTMPContext *rt = s->priv_data;
+    int ret;
+
+    for(;;) {
+        RTMPPacket rpkt;
+        if ((ret = ff_rtmp_packet_read(rt->stream, &rpkt,
+                                       rt->chunk_size, rt->prev_pkt[0])) != 0) {
+            if (ret > 0) {
+                return AVERROR(EAGAIN);
+            } else {
+                return AVERROR(EIO);
+            }
+        }
+
+        ret = rtmp_parse_result(s, rt, &rpkt);
+        if (ret < 0) {//serious error in current packet
+            ff_rtmp_packet_destroy(&rpkt);
+            return -1;
+        }
+        if (for_header && rt->state == STATE_PLAYING) {
+            ff_rtmp_packet_destroy(&rpkt);
+            return 0;
+        }
+        if (!rpkt.data_size) {
+            ff_rtmp_packet_destroy(&rpkt);
+            continue;
+        }
+        if (rpkt.type == RTMP_PT_VIDEO || rpkt.type == RTMP_PT_AUDIO ||
+            rpkt.type == RTMP_PT_NOTIFY) {
+            uint8_t *p;
+            uint32_t ts = rpkt.timestamp;
+
+            if (rpkt.type == RTMP_PT_VIDEO) {
+                rt->video_ts += rpkt.timestamp;
+                ts = rt->video_ts;
+            } else if (rpkt.type == RTMP_PT_AUDIO) {
+                rt->audio_ts += rpkt.timestamp;
+                ts = rt->audio_ts;
+            }
+            // generate packet header and put data into buffer for FLV demuxer
+            rt->flv_off  = 0;
+            rt->flv_size = rpkt.data_size + 15;
+            rt->flv_data = p = av_realloc(rt->flv_data, rt->flv_size);
+            bytestream_put_byte(&p, rpkt.type);
+            bytestream_put_be24(&p, rpkt.data_size);
+            bytestream_put_be24(&p, ts);
+            bytestream_put_byte(&p, ts >> 24);
+            bytestream_put_be24(&p, 0);
+            bytestream_put_buffer(&p, rpkt.data, rpkt.data_size);
+            bytestream_put_be32(&p, 0);
+            ff_rtmp_packet_destroy(&rpkt);
+            return 0;
+        } else if (rpkt.type == RTMP_PT_METADATA) {
+            // we got raw FLV data, make it available for FLV demuxer
+            rt->flv_off  = 0;
+            rt->flv_size = rpkt.data_size;
+            rt->flv_data = av_realloc(rt->flv_data, rt->flv_size);
+            memcpy(rt->flv_data, rpkt.data, rpkt.data_size);
+            ff_rtmp_packet_destroy(&rpkt);
+            return 0;
+        }
+        ff_rtmp_packet_destroy(&rpkt);
+    }
+    return 0;
+}
+
+static int rtmp_close(URLContext *h)
+{
+    RTMPContext *rt = h->priv_data;
+
+    av_freep(&rt->flv_data);
+    url_close(rt->stream);
+    av_free(rt);
+    return 0;
+}
+
+/**
+ * Opens RTMP connection and verifies that the stream can be played.
+ *
+ * URL syntax: rtmp://server[:port][/app][/playpath]
+ *             where 'app' is first one or two directories in the path
+ *             (e.g. /ondemand/, /flash/live/, etc.)
+ *             and 'playpath' is a file name (the rest of the path,
+ *             may be prefixed with "mp4:")
+ */
+static int rtmp_open(URLContext *s, const char *uri, int flags)
+{
+    RTMPContext *rt;
+    char proto[8], hostname[256], path[1024], app[128], *fname;
+    uint8_t buf[2048];
+    int port, is_input;
+    int ret;
+
+    is_input = !(flags & URL_WRONLY);
+
+    rt = av_mallocz(sizeof(RTMPContext));
+    if (!rt)
+        return AVERROR(ENOMEM);
+    s->priv_data = rt;
+
+    url_split(proto, sizeof(proto), NULL, 0, hostname, sizeof(hostname), &port,
+              path, sizeof(path), s->filename);
+
+    if (port < 0)
+        port = RTMP_DEFAULT_PORT;
+    snprintf(buf, sizeof(buf), "tcp://%s:%d", hostname, port);
+
+    if (url_open(&rt->stream, buf, URL_RDWR) < 0)
+        goto fail;
+
+    if (!is_input) {
+        av_log(LOG_CONTEXT, AV_LOG_ERROR, "RTMP output is not supported yet.\n");
+        goto fail;
+    } else {
+        rt->state = STATE_START;
+        if (rtmp_handshake(s, rt))
+            return -1;
+
+        rt->chunk_size = 128;
+        rt->state = STATE_HANDSHAKED;
+        //extract "app" part from path
+        if (!strncmp(path, "/ondemand/", 10)) {
+            fname = path + 10;
+            memcpy(app, "ondemand", 9);
+        } else {
+            char *p = strchr(path + 1, '/');
+            if (!p) {
+                fname = path + 1;
+                app[0] = '\0';
+            } else {
+                fname = strchr(p + 1, '/');
+                if (!fname) {
+                    fname = p + 1;
+                    av_strlcpy(app, path + 1, p - path);
+                } else {
+                    fname++;
+                    av_strlcpy(app, path + 1, fname - path - 1);
+                }
+            }
+        }
+        if (!strcmp(fname + strlen(fname) - 4, ".f4v") ||
+            !strcmp(fname + strlen(fname) - 4, ".mp4")) {
+            memcpy(rt->playpath, "mp4:", 5);
+        } else {
+            rt->playpath[0] = 0;
+        }
+        strncat(rt->playpath, fname, sizeof(rt->playpath) - 5);
+
+        av_log(LOG_CONTEXT, AV_LOG_DEBUG, "Proto = %s, path = %s, app = %s, fname = %s\n",
+               proto, path, app, rt->playpath);
+        gen_connect(s, rt, proto, hostname, port, app);
+
+        do {
+            ret = get_packet(s, 1);
+        } while (ret == EAGAIN);
+        if (ret < 0)
+            goto fail;
+        // generate FLV header for demuxer
+        rt->flv_size = 13;
+        rt->flv_data = av_realloc(rt->flv_data, rt->flv_size);
+        rt->flv_off  = 0;
+        memcpy(rt->flv_data, "FLV\1\5\0\0\0\011\0\0\0\0", rt->flv_size);
+    }
+
+    s->max_packet_size = url_get_max_packet_size(rt->stream);
+    s->is_streamed     = 1;
+    return 0;
+
+fail:
+    rtmp_close(s);
+    return AVERROR(EIO);
+}
+
+static int rtmp_read(URLContext *s, uint8_t *buf, int size)
+{
+    RTMPContext *rt = s->priv_data;
+    int orig_size = size;
+    int ret;
+
+    while (size > 0) {
+        int data_left = rt->flv_size - rt->flv_off;
+
+        if (data_left >= size) {
+            memcpy(buf, rt->flv_data + rt->flv_off, size);
+            rt->flv_off += size;
+            return orig_size;
+        }
+        if (data_left > 0) {
+            memcpy(buf, rt->flv_data + rt->flv_off, data_left);
+            buf  += data_left;
+            size -= data_left;
+            rt->flv_off = rt->flv_size;
+        }
+        if ((ret = get_packet(s, 0)) < 0)
+           return ret;
+    }
+    return orig_size;
+}
+
+static int rtmp_write(URLContext *h, uint8_t *buf, int size)
+{
+    return 0;
+}
+
+URLProtocol rtmp_protocol = {
+    "rtmp",
+    rtmp_open,
+    rtmp_read,
+    rtmp_write,
+    NULL, /* seek */
+    rtmp_close,
+};