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