MMSH support, the most popular and widely used of all MMS variants. Written by

Zhentan Feng <spyfeng gmail com> as part of Google's Summer of Code program.

Originally committed as revision 24861 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 369 insertions, 0 deletions

diff --git a/libavformat/mmsh.c b/libavformat/mmsh.c
new file mode 100644
index 0000000000..5a74d9b7ae
--- /dev/null
+++ b/libavformat/mmsh.c
@@ -0,0 +1,369 @@
+/*
+ * MMS protocol over HTTP
+ * Copyright (c) 2010 Zhentan Feng <spyfeng at gmail dot com>
+ *
+ * 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
+ */
+
+/*
+ * Reference
+ * Windows Media HTTP Streaming Protocol.
+ * http://msdn.microsoft.com/en-us/library/cc251059(PROT.10).aspx
+ */
+
+#include <string.h>
+#include "libavutil/intreadwrite.h"
+#include "libavutil/avstring.h"
+#include "libavformat/internal.h"
+#include "mms.h"
+#include "asf.h"
+#include "http.h"
+
+#define CHUNK_HEADER_LENGTH 4   // 2bytes chunk type and 2bytes chunk length.
+#define EXT_HEADER_LENGTH   8   // 4bytes sequence, 2bytes useless and 2bytes chunk length.
+
+// see Ref 2.2.1.8
+#define USERAGENT  "User-Agent: NSPlayer/4.1.0.3856\r\n"
+// see Ref 2.2.1.4.33
+// the guid value can be changed to any valid value.
+#define CLIENTGUID "Pragma: xClientGUID={c77e7400-738a-11d2-9add-0020af0a3278}\r\n"
+
+// see Ref 2.2.3 for packet type define:
+// chunk type contains 2 fields: Frame and PacketID.
+// Frame is 0x24 or 0xA4(rarely), different PacketID indicates different packet type.
+typedef enum {
+    CHUNK_TYPE_DATA          = 0x4424,
+    CHUNK_TYPE_ASF_HEADER    = 0x4824,
+    CHUNK_TYPE_END           = 0x4524,
+    CHUNK_TYPE_STREAM_CHANGE = 0x4324,
+} ChunkType;
+
+typedef struct {
+    MMSContext mms;
+    int request_seq;  ///< request packet sequence
+    int chunk_seq;    ///< data packet sequence
+} MMSHContext;
+
+static int mmsh_close(URLContext *h)
+{
+    MMSHContext *mmsh = (MMSHContext *)h->priv_data;
+    MMSContext *mms   = &mmsh->mms;
+    if (mms->mms_hd)
+        url_close(mms->mms_hd);
+    av_free(mms->streams);
+    av_free(mms->asf_header);
+    av_freep(&h->priv_data);
+    return 0;
+}
+
+static ChunkType get_chunk_header(MMSHContext *mmsh, int *len)
+{
+    MMSContext *mms = &mmsh->mms;
+    uint8_t chunk_header[CHUNK_HEADER_LENGTH];
+    uint8_t ext_header[EXT_HEADER_LENGTH];
+    ChunkType chunk_type;
+    int chunk_len, res, ext_header_len;
+
+    res = url_read_complete(mms->mms_hd, chunk_header, CHUNK_HEADER_LENGTH);
+    if (res != CHUNK_HEADER_LENGTH) {
+        av_log(NULL, AV_LOG_ERROR, "Read data packet header failed!\n");
+        return AVERROR(EIO);
+    }
+    chunk_type = AV_RL16(chunk_header);
+    chunk_len  = AV_RL16(chunk_header + 2);
+
+    switch (chunk_type) {
+    case CHUNK_TYPE_END:
+    case CHUNK_TYPE_STREAM_CHANGE:
+        ext_header_len = 4;
+        break;
+    case CHUNK_TYPE_ASF_HEADER:
+    case CHUNK_TYPE_DATA:
+        ext_header_len = 8;
+        break;
+    default:
+        av_log(NULL, AV_LOG_ERROR, "Strange chunk type %d\n", chunk_type);
+        return AVERROR_INVALIDDATA;
+    }
+
+    res = url_read_complete(mms->mms_hd, ext_header, ext_header_len);
+    if (res != ext_header_len) {
+        av_log(NULL, AV_LOG_ERROR, "Read ext header failed!\n");
+        return AVERROR(EIO);
+    }
+    *len = chunk_len - ext_header_len;
+    if (chunk_type == CHUNK_TYPE_END || chunk_type == CHUNK_TYPE_DATA)
+        mmsh->chunk_seq = AV_RL32(ext_header);
+    return chunk_type;
+}
+
+static int read_data_packet(MMSHContext *mmsh, const int len)
+{
+    MMSContext *mms   = &mmsh->mms;
+    int res;
+    if (len > sizeof(mms->in_buffer)) {
+        av_log(NULL, AV_LOG_ERROR,
+               "Data packet length %d exceeds the in_buffer size %d\n",
+               len, sizeof(mms->in_buffer));
+        return AVERROR(EIO);
+    }
+    res = url_read_complete(mms->mms_hd, mms->in_buffer, len);
+    dprintf(NULL, "Data packet len = %d\n", len);
+    if (res != len) {
+        av_log(NULL, AV_LOG_ERROR, "Read data packet failed!\n");
+        return AVERROR(EIO);
+    }
+    if (len > mms->asf_packet_len) {
+        av_log(NULL, AV_LOG_ERROR,
+               "Chunk length %d exceed packet length %d\n",len, mms->asf_packet_len);
+        return AVERROR_INVALIDDATA;
+    } else {
+        memset(mms->in_buffer + len, 0, mms->asf_packet_len - len); // padding
+    }
+    mms->read_in_ptr      = mms->in_buffer;
+    mms->remaining_in_len = mms->asf_packet_len;
+    return 0;
+}
+
+static int get_http_header_data(MMSHContext *mmsh)
+{
+    MMSContext *mms = &mmsh->mms;
+    int res, len;
+    ChunkType chunk_type;
+
+    for (;;) {
+        len = 0;
+        chunk_type = get_chunk_header(mmsh, &len);
+        if (chunk_type < 0) {
+            return chunk_type;
+        } else if (chunk_type == CHUNK_TYPE_ASF_HEADER){
+            // get asf header and stored it
+            if (!mms->header_parsed) {
+                if (mms->asf_header) {
+                    if (len != mms->asf_header_size) {
+                        mms->asf_header_size = len;
+                        dprintf(NULL, "Header len changed from %d to %d\n",
+                                mms->asf_header_size, len);
+                        av_freep(&mms->asf_header);
+                    }
+                }
+                mms->asf_header = av_mallocz(len);
+                if (!mms->asf_header) {
+                    return AVERROR(ENOMEM);
+                }
+                mms->asf_header_size = len;
+            }
+            if (len > mms->asf_header_size) {
+                av_log(NULL, AV_LOG_ERROR,
+                       "Asf header packet len = %d exceed the asf header buf size %d\n",
+                       len, mms->asf_header_size);
+                return AVERROR(EIO);
+            }
+            res = url_read_complete(mms->mms_hd, mms->asf_header, len);
+            if (res != len) {
+                av_log(NULL, AV_LOG_ERROR,
+                       "Recv asf header data len %d != expected len %d\n", res, len);
+                return AVERROR(EIO);
+            }
+            mms->asf_header_size = len;
+            if (!mms->header_parsed) {
+                res = ff_mms_asf_header_parser(mms);
+                mms->header_parsed = 1;
+                return res;
+            }
+        } else if (chunk_type == CHUNK_TYPE_DATA) {
+            // read data packet and do padding
+            return read_data_packet(mmsh, len);
+        } else {
+            if (len) {
+                if (len > sizeof(mms->in_buffer)) {
+                    av_log(NULL, AV_LOG_ERROR,
+                           "Other packet len = %d exceed the in_buffer size %d\n",
+                           len, sizeof(mms->in_buffer));
+                    return AVERROR(EIO);
+                }
+                res = url_read_complete(mms->mms_hd, mms->in_buffer, len);
+                if (res != len) {
+                    av_log(NULL, AV_LOG_ERROR, "Read other chunk type data failed!\n");
+                    return AVERROR(EIO);
+                } else {
+                    dprintf(NULL, "Skip chunk type %d \n", chunk_type);
+                    continue;
+                }
+            }
+        }
+    }
+    return 0;
+}
+
+static int mmsh_open(URLContext *h, const char *uri, int flags)
+{
+    int i, port, err;
+    char httpname[256], path[256], host[128], location[1024];
+    char *stream_selection;
+    char headers[1024];
+    MMSHContext *mmsh;
+    MMSContext *mms;
+
+    mmsh = h->priv_data = av_mallocz(sizeof(MMSHContext));
+    if (!h->priv_data)
+        return AVERROR(ENOMEM);
+    mmsh->request_seq = h->is_streamed = 1;
+    mms = &mmsh->mms;
+    av_strlcpy(location, uri, sizeof(location));
+
+    av_url_split(NULL, 0, NULL, 0,
+        host, sizeof(host), &port, path, sizeof(path), location);
+    if (port<0)
+        port = 80; // default mmsh protocol port
+    ff_url_join(httpname, sizeof(httpname), "http", NULL, host, port, path);
+
+    if (url_alloc(&mms->mms_hd, httpname, URL_RDONLY) < 0) {
+        return AVERROR(EIO);
+    }
+
+    snprintf(headers, sizeof(headers),
+             "Accept: */*\r\n"
+             USERAGENT
+             "Host: %s:%d\r\n"
+             "Pragma: no-cache,rate=1.000000,stream-time=0,"
+             "stream-offset=0:0,request-context=%u,max-duration=0\r\n"
+             CLIENTGUID
+             "Connection: Close\r\n\r\n",
+             host, port, mmsh->request_seq++);
+    ff_http_set_headers(mms->mms_hd, headers);
+
+    err = url_connect(mms->mms_hd);
+    if (err) {
+        goto fail;
+    }
+    err = get_http_header_data(mmsh);
+    if (err) {
+        av_log(NULL, AV_LOG_ERROR, "Get http header data failed!\n");
+        goto fail;
+    }
+
+    // close the socket and then reopen it for sending the second play request.
+    url_close(mms->mms_hd);
+    memset(headers, 0, sizeof(headers));
+    if (url_alloc(&mms->mms_hd, httpname, URL_RDONLY) < 0) {
+        return AVERROR(EIO);
+    }
+    stream_selection = av_mallocz(mms->stream_num * 19 + 1);
+    if (!stream_selection)
+        return AVERROR(ENOMEM);
+    for (i = 0; i < mms->stream_num; i++) {
+        char tmp[20];
+        err = snprintf(tmp, sizeof(tmp), "ffff:%d:0 ", mms->streams[i].id);
+        if (err < 0)
+            goto fail;
+        av_strlcat(stream_selection, tmp, mms->stream_num * 19 + 1);
+    }
+    // send play request
+    err = snprintf(headers, sizeof(headers),
+                   "Accept: */*\r\n"
+                   USERAGENT
+                   "Host: %s:%d\r\n"
+                   "Pragma: no-cache,rate=1.000000,request-context=%u\r\n"
+                   "Pragma: xPlayStrm=1\r\n"
+                   CLIENTGUID
+                   "Pragma: stream-switch-count=%d\r\n"
+                   "Pragma: stream-switch-entry=%s\r\n"
+                   "Connection: Close\r\n\r\n",
+                   host, port, mmsh->request_seq++, mms->stream_num, stream_selection);
+    av_freep(&stream_selection);
+    if (err < 0) {
+        av_log(NULL, AV_LOG_ERROR, "Build play request failed!\n");
+        goto fail;
+    }
+    dprintf(NULL, "out_buffer is %s", headers);
+    ff_http_set_headers(mms->mms_hd, headers);
+
+    err = url_connect(mms->mms_hd);
+    if (err) {
+          goto fail;
+    }
+
+    err = get_http_header_data(mmsh);
+    if (err) {
+        av_log(NULL, AV_LOG_ERROR, "Get http header data failed!\n");
+        goto fail;
+    }
+
+    dprintf(NULL, "Connection successfully open\n");
+    return 0;
+fail:
+    av_freep(&stream_selection);
+    mmsh_close(h);
+    dprintf(NULL, "Connection failed with error %d\n", err);
+    return err;
+}
+
+static int handle_chunk_type(MMSHContext *mmsh)
+{
+    MMSContext *mms = &mmsh->mms;
+    int res, len = 0;
+    ChunkType chunk_type;
+    chunk_type = get_chunk_header(mmsh, &len);
+
+    switch (chunk_type) {
+    case CHUNK_TYPE_END:
+        mmsh->chunk_seq = 0;
+        av_log(NULL, AV_LOG_ERROR, "Stream ended!\n");
+        return AVERROR(EIO);
+    case CHUNK_TYPE_STREAM_CHANGE:
+        mms->header_parsed = 0;
+        if (res = get_http_header_data(mmsh)) {
+            av_log(NULL, AV_LOG_ERROR,"Stream changed! Failed to get new header!\n");
+            return res;
+        }
+        break;
+    case CHUNK_TYPE_DATA:
+        return read_data_packet(mmsh, len);
+    default:
+        av_log(NULL, AV_LOG_ERROR, "Recv other type packet %d\n", chunk_type);
+        return AVERROR_INVALIDDATA;
+    }
+    return 0;
+}
+
+static int mmsh_read(URLContext *h, uint8_t *buf, int size)
+{
+    int res = 0;
+    MMSHContext *mmsh = h->priv_data;
+    MMSContext *mms   = &mmsh->mms;
+    do {
+        if (mms->asf_header_read_size < mms->asf_header_size) {
+            // copy asf header into buffer
+            res = ff_mms_read_header(mms, buf, size);
+        } else {
+            if (!mms->remaining_in_len && (res = handle_chunk_type(mmsh)))
+                return res;
+            res = ff_mms_read_data(mms, buf, size);
+        }
+    } while (!res);
+    return res;
+}
+
+URLProtocol mmsh_protocol = {
+    .name      = "mmsh",
+    .url_open  = mmsh_open,
+    .url_read  = mmsh_read,
+    .url_write = NULL,
+    .url_seek  = NULL,
+    .url_close = mmsh_close,
+};