| /* |
| * 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 "libavutil/opt.h" |
| #include "internal.h" |
| #include "mms.h" |
| #include "asf.h" |
| #include "http.h" |
| #include "url.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; |
| uint8_t location[1024]; |
| 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) |
| ffurl_closep(&mms->mms_hd); |
| av_freep(&mms->streams); |
| av_freep(&mms->asf_header); |
| 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 = ffurl_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 = ffurl_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 %"SIZE_SPECIFIER"\n", |
| len, sizeof(mms->in_buffer)); |
| return AVERROR(EIO); |
| } |
| res = ffurl_read_complete(mms->mms_hd, mms->in_buffer, len); |
| av_dlog(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; |
| res = chunk_type = get_chunk_header(mmsh, &len); |
| if (res < 0) { |
| return res; |
| } 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; |
| av_dlog(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 = ffurl_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 %"SIZE_SPECIFIER"\n", |
| len, sizeof(mms->in_buffer)); |
| return AVERROR(EIO); |
| } |
| res = ffurl_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 { |
| av_dlog(NULL, "Skip chunk type %d \n", chunk_type); |
| continue; |
| } |
| } |
| } |
| } |
| } |
| |
| static int mmsh_open_internal(URLContext *h, const char *uri, int flags, int timestamp, int64_t pos) |
| { |
| int i, port, err; |
| char httpname[256], path[256], host[128]; |
| char *stream_selection = NULL; |
| char headers[1024]; |
| MMSHContext *mmsh = h->priv_data; |
| MMSContext *mms; |
| |
| mmsh->request_seq = h->is_streamed = 1; |
| mms = &mmsh->mms; |
| av_strlcpy(mmsh->location, uri, sizeof(mmsh->location)); |
| |
| av_url_split(NULL, 0, NULL, 0, |
| host, sizeof(host), &port, path, sizeof(path), mmsh->location); |
| if (port<0) |
| port = 80; // default mmsh protocol port |
| ff_url_join(httpname, sizeof(httpname), "http", NULL, host, port, "%s", path); |
| |
| if (ffurl_alloc(&mms->mms_hd, httpname, AVIO_FLAG_READ, |
| &h->interrupt_callback) < 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", |
| host, port, mmsh->request_seq++); |
| av_opt_set(mms->mms_hd->priv_data, "headers", headers, 0); |
| |
| err = ffurl_connect(mms->mms_hd, NULL); |
| 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. |
| ffurl_close(mms->mms_hd); |
| memset(headers, 0, sizeof(headers)); |
| if ((err = ffurl_alloc(&mms->mms_hd, httpname, AVIO_FLAG_READ, |
| &h->interrupt_callback)) < 0) { |
| goto fail; |
| } |
| 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" |
| "Pragma: no-cache,rate=1.000000,stream-time=%u" |
| "Connection: Close\r\n", |
| host, port, mmsh->request_seq++, mms->stream_num, stream_selection, timestamp); |
| av_freep(&stream_selection); |
| if (err < 0) { |
| av_log(NULL, AV_LOG_ERROR, "Build play request failed!\n"); |
| goto fail; |
| } |
| av_dlog(NULL, "out_buffer is %s", headers); |
| av_opt_set(mms->mms_hd->priv_data, "headers", headers, 0); |
| |
| err = ffurl_connect(mms->mms_hd, NULL); |
| 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; |
| } |
| |
| av_dlog(NULL, "Connection successfully open\n"); |
| return 0; |
| fail: |
| av_freep(&stream_selection); |
| mmsh_close(h); |
| av_dlog(NULL, "Connection failed with error %d\n", err); |
| return err; |
| } |
| |
| static int mmsh_open(URLContext *h, const char *uri, int flags) |
| { |
| return mmsh_open_internal(h, uri, flags, 0, 0); |
| } |
| |
| 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; |
| } |
| |
| static int64_t mmsh_read_seek(URLContext *h, int stream_index, |
| int64_t timestamp, int flags) |
| { |
| MMSHContext *mmsh_old = h->priv_data; |
| MMSHContext *mmsh = av_mallocz(sizeof(*mmsh)); |
| int ret; |
| |
| if (!mmsh) |
| return AVERROR(ENOMEM); |
| |
| h->priv_data = mmsh; |
| ret= mmsh_open_internal(h, mmsh_old->location, 0, FFMAX(timestamp, 0), 0); |
| if(ret>=0){ |
| h->priv_data = mmsh_old; |
| mmsh_close(h); |
| h->priv_data = mmsh; |
| av_free(mmsh_old); |
| mmsh->mms.asf_header_read_size = mmsh->mms.asf_header_size; |
| }else { |
| h->priv_data = mmsh_old; |
| av_free(mmsh); |
| } |
| |
| return ret; |
| } |
| |
| static int64_t mmsh_seek(URLContext *h, int64_t pos, int whence) |
| { |
| MMSHContext *mmsh = h->priv_data; |
| MMSContext *mms = &mmsh->mms; |
| |
| if(pos == 0 && whence == SEEK_CUR) |
| return mms->asf_header_read_size + mms->remaining_in_len + mmsh->chunk_seq * (int64_t)mms->asf_packet_len; |
| return AVERROR(ENOSYS); |
| } |
| |
| URLProtocol ff_mmsh_protocol = { |
| .name = "mmsh", |
| .url_open = mmsh_open, |
| .url_read = mmsh_read, |
| .url_seek = mmsh_seek, |
| .url_close = mmsh_close, |
| .url_read_seek = mmsh_read_seek, |
| .priv_data_size = sizeof(MMSHContext), |
| .flags = URL_PROTOCOL_FLAG_NETWORK, |
| }; |
