yading@11: /*
yading@11:  * MMS protocol over HTTP
yading@11:  * Copyright (c) 2010 Zhentan Feng <spyfeng at gmail dot com>
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: /*
yading@11:  * Reference
yading@11:  * Windows Media HTTP Streaming Protocol.
yading@11:  * http://msdn.microsoft.com/en-us/library/cc251059(PROT.10).aspx
yading@11:  */
yading@11: 
yading@11: #include <string.h>
yading@11: #include "libavutil/intreadwrite.h"
yading@11: #include "libavutil/avstring.h"
yading@11: #include "libavutil/opt.h"
yading@11: #include "internal.h"
yading@11: #include "mms.h"
yading@11: #include "asf.h"
yading@11: #include "http.h"
yading@11: #include "url.h"
yading@11: 
yading@11: #define CHUNK_HEADER_LENGTH 4   // 2bytes chunk type and 2bytes chunk length.
yading@11: #define EXT_HEADER_LENGTH   8   // 4bytes sequence, 2bytes useless and 2bytes chunk length.
yading@11: 
yading@11: // see Ref 2.2.1.8
yading@11: #define USERAGENT  "User-Agent: NSPlayer/4.1.0.3856\r\n"
yading@11: // see Ref 2.2.1.4.33
yading@11: // the guid value can be changed to any valid value.
yading@11: #define CLIENTGUID "Pragma: xClientGUID={c77e7400-738a-11d2-9add-0020af0a3278}\r\n"
yading@11: 
yading@11: // see Ref 2.2.3 for packet type define:
yading@11: // chunk type contains 2 fields: Frame and PacketID.
yading@11: // Frame is 0x24 or 0xA4(rarely), different PacketID indicates different packet type.
yading@11: typedef enum {
yading@11:     CHUNK_TYPE_DATA          = 0x4424,
yading@11:     CHUNK_TYPE_ASF_HEADER    = 0x4824,
yading@11:     CHUNK_TYPE_END           = 0x4524,
yading@11:     CHUNK_TYPE_STREAM_CHANGE = 0x4324,
yading@11: } ChunkType;
yading@11: 
yading@11: typedef struct {
yading@11:     MMSContext mms;
yading@11:     uint8_t location[1024];
yading@11:     int request_seq;  ///< request packet sequence
yading@11:     int chunk_seq;    ///< data packet sequence
yading@11: } MMSHContext;
yading@11: 
yading@11: static int mmsh_close(URLContext *h)
yading@11: {
yading@11:     MMSHContext *mmsh = (MMSHContext *)h->priv_data;
yading@11:     MMSContext *mms   = &mmsh->mms;
yading@11:     if (mms->mms_hd)
yading@11:         ffurl_close(mms->mms_hd);
yading@11:     av_free(mms->streams);
yading@11:     av_free(mms->asf_header);
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static ChunkType get_chunk_header(MMSHContext *mmsh, int *len)
yading@11: {
yading@11:     MMSContext *mms = &mmsh->mms;
yading@11:     uint8_t chunk_header[CHUNK_HEADER_LENGTH];
yading@11:     uint8_t ext_header[EXT_HEADER_LENGTH];
yading@11:     ChunkType chunk_type;
yading@11:     int chunk_len, res, ext_header_len;
yading@11: 
yading@11:     res = ffurl_read_complete(mms->mms_hd, chunk_header, CHUNK_HEADER_LENGTH);
yading@11:     if (res != CHUNK_HEADER_LENGTH) {
yading@11:         av_log(NULL, AV_LOG_ERROR, "Read data packet header failed!\n");
yading@11:         return AVERROR(EIO);
yading@11:     }
yading@11:     chunk_type = AV_RL16(chunk_header);
yading@11:     chunk_len  = AV_RL16(chunk_header + 2);
yading@11: 
yading@11:     switch (chunk_type) {
yading@11:     case CHUNK_TYPE_END:
yading@11:     case CHUNK_TYPE_STREAM_CHANGE:
yading@11:         ext_header_len = 4;
yading@11:         break;
yading@11:     case CHUNK_TYPE_ASF_HEADER:
yading@11:     case CHUNK_TYPE_DATA:
yading@11:         ext_header_len = 8;
yading@11:         break;
yading@11:     default:
yading@11:         av_log(NULL, AV_LOG_ERROR, "Strange chunk type %d\n", chunk_type);
yading@11:         return AVERROR_INVALIDDATA;
yading@11:     }
yading@11: 
yading@11:     res = ffurl_read_complete(mms->mms_hd, ext_header, ext_header_len);
yading@11:     if (res != ext_header_len) {
yading@11:         av_log(NULL, AV_LOG_ERROR, "Read ext header failed!\n");
yading@11:         return AVERROR(EIO);
yading@11:     }
yading@11:     *len = chunk_len - ext_header_len;
yading@11:     if (chunk_type == CHUNK_TYPE_END || chunk_type == CHUNK_TYPE_DATA)
yading@11:         mmsh->chunk_seq = AV_RL32(ext_header);
yading@11:     return chunk_type;
yading@11: }
yading@11: 
yading@11: static int read_data_packet(MMSHContext *mmsh, const int len)
yading@11: {
yading@11:     MMSContext *mms   = &mmsh->mms;
yading@11:     int res;
yading@11:     if (len > sizeof(mms->in_buffer)) {
yading@11:         av_log(NULL, AV_LOG_ERROR,
yading@11:                "Data packet length %d exceeds the in_buffer size %zu\n",
yading@11:                len, sizeof(mms->in_buffer));
yading@11:         return AVERROR(EIO);
yading@11:     }
yading@11:     res = ffurl_read_complete(mms->mms_hd, mms->in_buffer, len);
yading@11:     av_dlog(NULL, "Data packet len = %d\n", len);
yading@11:     if (res != len) {
yading@11:         av_log(NULL, AV_LOG_ERROR, "Read data packet failed!\n");
yading@11:         return AVERROR(EIO);
yading@11:     }
yading@11:     if (len > mms->asf_packet_len) {
yading@11:         av_log(NULL, AV_LOG_ERROR,
yading@11:                "Chunk length %d exceed packet length %d\n",len, mms->asf_packet_len);
yading@11:         return AVERROR_INVALIDDATA;
yading@11:     } else {
yading@11:         memset(mms->in_buffer + len, 0, mms->asf_packet_len - len); // padding
yading@11:     }
yading@11:     mms->read_in_ptr      = mms->in_buffer;
yading@11:     mms->remaining_in_len = mms->asf_packet_len;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int get_http_header_data(MMSHContext *mmsh)
yading@11: {
yading@11:     MMSContext *mms = &mmsh->mms;
yading@11:     int res, len;
yading@11:     ChunkType chunk_type;
yading@11: 
yading@11:     for (;;) {
yading@11:         len = 0;
yading@11:         res = chunk_type = get_chunk_header(mmsh, &len);
yading@11:         if (res < 0) {
yading@11:             return res;
yading@11:         } else if (chunk_type == CHUNK_TYPE_ASF_HEADER){
yading@11:             // get asf header and stored it
yading@11:             if (!mms->header_parsed) {
yading@11:                 if (mms->asf_header) {
yading@11:                     if (len != mms->asf_header_size) {
yading@11:                         mms->asf_header_size = len;
yading@11:                         av_dlog(NULL, "Header len changed from %d to %d\n",
yading@11:                                 mms->asf_header_size, len);
yading@11:                         av_freep(&mms->asf_header);
yading@11:                     }
yading@11:                 }
yading@11:                 mms->asf_header = av_mallocz(len);
yading@11:                 if (!mms->asf_header) {
yading@11:                     return AVERROR(ENOMEM);
yading@11:                 }
yading@11:                 mms->asf_header_size = len;
yading@11:             }
yading@11:             if (len > mms->asf_header_size) {
yading@11:                 av_log(NULL, AV_LOG_ERROR,
yading@11:                        "Asf header packet len = %d exceed the asf header buf size %d\n",
yading@11:                        len, mms->asf_header_size);
yading@11:                 return AVERROR(EIO);
yading@11:             }
yading@11:             res = ffurl_read_complete(mms->mms_hd, mms->asf_header, len);
yading@11:             if (res != len) {
yading@11:                 av_log(NULL, AV_LOG_ERROR,
yading@11:                        "Recv asf header data len %d != expected len %d\n", res, len);
yading@11:                 return AVERROR(EIO);
yading@11:             }
yading@11:             mms->asf_header_size = len;
yading@11:             if (!mms->header_parsed) {
yading@11:                 res = ff_mms_asf_header_parser(mms);
yading@11:                 mms->header_parsed = 1;
yading@11:                 return res;
yading@11:             }
yading@11:         } else if (chunk_type == CHUNK_TYPE_DATA) {
yading@11:             // read data packet and do padding
yading@11:             return read_data_packet(mmsh, len);
yading@11:         } else {
yading@11:             if (len) {
yading@11:                 if (len > sizeof(mms->in_buffer)) {
yading@11:                     av_log(NULL, AV_LOG_ERROR,
yading@11:                            "Other packet len = %d exceed the in_buffer size %zu\n",
yading@11:                            len, sizeof(mms->in_buffer));
yading@11:                     return AVERROR(EIO);
yading@11:                 }
yading@11:                 res = ffurl_read_complete(mms->mms_hd, mms->in_buffer, len);
yading@11:                 if (res != len) {
yading@11:                     av_log(NULL, AV_LOG_ERROR, "Read other chunk type data failed!\n");
yading@11:                     return AVERROR(EIO);
yading@11:                 } else {
yading@11:                     av_dlog(NULL, "Skip chunk type %d \n", chunk_type);
yading@11:                     continue;
yading@11:                 }
yading@11:             }
yading@11:         }
yading@11:     }
yading@11: }
yading@11: 
yading@11: static int mmsh_open_internal(URLContext *h, const char *uri, int flags, int timestamp, int64_t pos)
yading@11: {
yading@11:     int i, port, err;
yading@11:     char httpname[256], path[256], host[128];
yading@11:     char *stream_selection = NULL;
yading@11:     char headers[1024];
yading@11:     MMSHContext *mmsh = h->priv_data;
yading@11:     MMSContext *mms;
yading@11: 
yading@11:     mmsh->request_seq = h->is_streamed = 1;
yading@11:     mms = &mmsh->mms;
yading@11:     av_strlcpy(mmsh->location, uri, sizeof(mmsh->location));
yading@11: 
yading@11:     av_url_split(NULL, 0, NULL, 0,
yading@11:         host, sizeof(host), &port, path, sizeof(path), mmsh->location);
yading@11:     if (port<0)
yading@11:         port = 80; // default mmsh protocol port
yading@11:     ff_url_join(httpname, sizeof(httpname), "http", NULL, host, port, "%s", path);
yading@11: 
yading@11:     if (ffurl_alloc(&mms->mms_hd, httpname, AVIO_FLAG_READ,
yading@11:                     &h->interrupt_callback) < 0) {
yading@11:         return AVERROR(EIO);
yading@11:     }
yading@11: 
yading@11:     snprintf(headers, sizeof(headers),
yading@11:              "Accept: */*\r\n"
yading@11:              USERAGENT
yading@11:              "Host: %s:%d\r\n"
yading@11:              "Pragma: no-cache,rate=1.000000,stream-time=0,"
yading@11:              "stream-offset=0:0,request-context=%u,max-duration=0\r\n"
yading@11:              CLIENTGUID
yading@11:              "Connection: Close\r\n",
yading@11:              host, port, mmsh->request_seq++);
yading@11:     av_opt_set(mms->mms_hd->priv_data, "headers", headers, 0);
yading@11: 
yading@11:     err = ffurl_connect(mms->mms_hd, NULL);
yading@11:     if (err) {
yading@11:         goto fail;
yading@11:     }
yading@11:     err = get_http_header_data(mmsh);
yading@11:     if (err) {
yading@11:         av_log(NULL, AV_LOG_ERROR, "Get http header data failed!\n");
yading@11:         goto fail;
yading@11:     }
yading@11: 
yading@11:     // close the socket and then reopen it for sending the second play request.
yading@11:     ffurl_close(mms->mms_hd);
yading@11:     memset(headers, 0, sizeof(headers));
yading@11:     if ((err = ffurl_alloc(&mms->mms_hd, httpname, AVIO_FLAG_READ,
yading@11:                            &h->interrupt_callback)) < 0) {
yading@11:         goto fail;
yading@11:     }
yading@11:     stream_selection = av_mallocz(mms->stream_num * 19 + 1);
yading@11:     if (!stream_selection)
yading@11:         return AVERROR(ENOMEM);
yading@11:     for (i = 0; i < mms->stream_num; i++) {
yading@11:         char tmp[20];
yading@11:         err = snprintf(tmp, sizeof(tmp), "ffff:%d:0 ", mms->streams[i].id);
yading@11:         if (err < 0)
yading@11:             goto fail;
yading@11:         av_strlcat(stream_selection, tmp, mms->stream_num * 19 + 1);
yading@11:     }
yading@11:     // send play request
yading@11:     err = snprintf(headers, sizeof(headers),
yading@11:                    "Accept: */*\r\n"
yading@11:                    USERAGENT
yading@11:                    "Host: %s:%d\r\n"
yading@11:                    "Pragma: no-cache,rate=1.000000,request-context=%u\r\n"
yading@11:                    "Pragma: xPlayStrm=1\r\n"
yading@11:                    CLIENTGUID
yading@11:                    "Pragma: stream-switch-count=%d\r\n"
yading@11:                    "Pragma: stream-switch-entry=%s\r\n"
yading@11:                    "Pragma: no-cache,rate=1.000000,stream-time=%u"
yading@11:                    "Connection: Close\r\n",
yading@11:                    host, port, mmsh->request_seq++, mms->stream_num, stream_selection, timestamp);
yading@11:     av_freep(&stream_selection);
yading@11:     if (err < 0) {
yading@11:         av_log(NULL, AV_LOG_ERROR, "Build play request failed!\n");
yading@11:         goto fail;
yading@11:     }
yading@11:     av_dlog(NULL, "out_buffer is %s", headers);
yading@11:     av_opt_set(mms->mms_hd->priv_data, "headers", headers, 0);
yading@11: 
yading@11:     err = ffurl_connect(mms->mms_hd, NULL);
yading@11:     if (err) {
yading@11:           goto fail;
yading@11:     }
yading@11: 
yading@11:     err = get_http_header_data(mmsh);
yading@11:     if (err) {
yading@11:         av_log(NULL, AV_LOG_ERROR, "Get http header data failed!\n");
yading@11:         goto fail;
yading@11:     }
yading@11: 
yading@11:     av_dlog(NULL, "Connection successfully open\n");
yading@11:     return 0;
yading@11: fail:
yading@11:     av_freep(&stream_selection);
yading@11:     mmsh_close(h);
yading@11:     av_dlog(NULL, "Connection failed with error %d\n", err);
yading@11:     return err;
yading@11: }
yading@11: 
yading@11: static int mmsh_open(URLContext *h, const char *uri, int flags)
yading@11: {
yading@11:     return mmsh_open_internal(h, uri, flags, 0, 0);
yading@11: }
yading@11: 
yading@11: static int handle_chunk_type(MMSHContext *mmsh)
yading@11: {
yading@11:     MMSContext *mms = &mmsh->mms;
yading@11:     int res, len = 0;
yading@11:     ChunkType chunk_type;
yading@11:     chunk_type = get_chunk_header(mmsh, &len);
yading@11: 
yading@11:     switch (chunk_type) {
yading@11:     case CHUNK_TYPE_END:
yading@11:         mmsh->chunk_seq = 0;
yading@11:         av_log(NULL, AV_LOG_ERROR, "Stream ended!\n");
yading@11:         return AVERROR(EIO);
yading@11:     case CHUNK_TYPE_STREAM_CHANGE:
yading@11:         mms->header_parsed = 0;
yading@11:         if (res = get_http_header_data(mmsh)) {
yading@11:             av_log(NULL, AV_LOG_ERROR,"Stream changed! Failed to get new header!\n");
yading@11:             return res;
yading@11:         }
yading@11:         break;
yading@11:     case CHUNK_TYPE_DATA:
yading@11:         return read_data_packet(mmsh, len);
yading@11:     default:
yading@11:         av_log(NULL, AV_LOG_ERROR, "Recv other type packet %d\n", chunk_type);
yading@11:         return AVERROR_INVALIDDATA;
yading@11:     }
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int mmsh_read(URLContext *h, uint8_t *buf, int size)
yading@11: {
yading@11:     int res = 0;
yading@11:     MMSHContext *mmsh = h->priv_data;
yading@11:     MMSContext *mms   = &mmsh->mms;
yading@11:     do {
yading@11:         if (mms->asf_header_read_size < mms->asf_header_size) {
yading@11:             // copy asf header into buffer
yading@11:             res = ff_mms_read_header(mms, buf, size);
yading@11:         } else {
yading@11:             if (!mms->remaining_in_len && (res = handle_chunk_type(mmsh)))
yading@11:                 return res;
yading@11:             res = ff_mms_read_data(mms, buf, size);
yading@11:         }
yading@11:     } while (!res);
yading@11:     return res;
yading@11: }
yading@11: 
yading@11: static int64_t mmsh_read_seek(URLContext *h, int stream_index,
yading@11:                         int64_t timestamp, int flags)
yading@11: {
yading@11:     MMSHContext *mmsh = h->priv_data;
yading@11:     MMSContext *mms   = &mmsh->mms;
yading@11:     int ret;
yading@11: 
yading@11:     ret= mmsh_open_internal(h, mmsh->location, 0, FFMAX(timestamp, 0), 0);
yading@11: 
yading@11:     if(ret>=0){
yading@11:         if (mms->mms_hd)
yading@11:             ffurl_close(mms->mms_hd);
yading@11:         av_freep(&mms->streams);
yading@11:         av_freep(&mms->asf_header);
yading@11:         av_free(mmsh);
yading@11:         mmsh = h->priv_data;
yading@11:         mms   = &mmsh->mms;
yading@11:         mms->asf_header_read_size= mms->asf_header_size;
yading@11:     }else
yading@11:         h->priv_data= mmsh;
yading@11:     return ret;
yading@11: }
yading@11: 
yading@11: static int64_t mmsh_seek(URLContext *h, int64_t pos, int whence)
yading@11: {
yading@11:     MMSHContext *mmsh = h->priv_data;
yading@11:     MMSContext *mms   = &mmsh->mms;
yading@11: 
yading@11:     if(pos == 0 && whence == SEEK_CUR)
yading@11:         return mms->asf_header_read_size + mms->remaining_in_len + mmsh->chunk_seq * (int64_t)mms->asf_packet_len;
yading@11:     return AVERROR(ENOSYS);
yading@11: }
yading@11: 
yading@11: URLProtocol ff_mmsh_protocol = {
yading@11:     .name           = "mmsh",
yading@11:     .url_open       = mmsh_open,
yading@11:     .url_read       = mmsh_read,
yading@11:     .url_seek       = mmsh_seek,
yading@11:     .url_close      = mmsh_close,
yading@11:     .url_read_seek  = mmsh_read_seek,
yading@11:     .priv_data_size = sizeof(MMSHContext),
yading@11:     .flags          = URL_PROTOCOL_FLAG_NETWORK,
yading@11: };