mirror of
https://gitee.com/openharmony/third_party_ffmpeg
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640 lines
24 KiB
C
640 lines
24 KiB
C
/*
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* MMS protocol over TCP
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* Copyright (c) 2006,2007 Ryan Martell
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* Copyright (c) 2007 Björn Axelsson
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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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/* References
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* MMS protocol specification:
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* [1]http://msdn.microsoft.com/en-us/library/cc234711(PROT.10).aspx
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* ASF specification. Revision 01.20.03.
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* [2]http://msdn.microsoft.com/en-us/library/bb643323.aspx
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*/
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#include "avformat.h"
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#include "mms.h"
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#include "internal.h"
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#include "avio_internal.h"
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#include "libavutil/intreadwrite.h"
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#include "libavcodec/bytestream.h"
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#include "network.h"
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#include "url.h"
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#define LOCAL_ADDRESS 0xc0a80081 // FIXME get and use correct local ip address.
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#define LOCAL_PORT 1037 // as above.
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/** Client to server packet types. */
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typedef enum {
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CS_PKT_INITIAL = 0x01,
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CS_PKT_PROTOCOL_SELECT = 0x02,
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CS_PKT_MEDIA_FILE_REQUEST = 0x05,
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CS_PKT_START_FROM_PKT_ID = 0x07,
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CS_PKT_STREAM_PAUSE = 0x09,
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CS_PKT_STREAM_CLOSE = 0x0d,
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CS_PKT_MEDIA_HEADER_REQUEST = 0x15,
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CS_PKT_TIMING_DATA_REQUEST = 0x18,
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CS_PKT_USER_PASSWORD = 0x1a,
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CS_PKT_KEEPALIVE = 0x1b,
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CS_PKT_STREAM_ID_REQUEST = 0x33,
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} MMSCSPacketType;
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/** Server to client packet types. */
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typedef enum {
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/** Control packets. */
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/*@{*/
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SC_PKT_CLIENT_ACCEPTED = 0x01,
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SC_PKT_PROTOCOL_ACCEPTED = 0x02,
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SC_PKT_PROTOCOL_FAILED = 0x03,
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SC_PKT_MEDIA_PKT_FOLLOWS = 0x05,
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SC_PKT_MEDIA_FILE_DETAILS = 0x06,
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SC_PKT_HEADER_REQUEST_ACCEPTED = 0x11,
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SC_PKT_TIMING_TEST_REPLY = 0x15,
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SC_PKT_PASSWORD_REQUIRED = 0x1a,
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SC_PKT_KEEPALIVE = 0x1b,
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SC_PKT_STREAM_STOPPED = 0x1e,
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SC_PKT_STREAM_CHANGING = 0x20,
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SC_PKT_STREAM_ID_ACCEPTED = 0x21,
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/*@}*/
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/** Pseudo packets. */
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/*@{*/
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SC_PKT_CANCEL = -1,
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SC_PKT_NO_DATA = -2,
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/*@}*/
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/** Data packets. */
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/*@{*/
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SC_PKT_ASF_HEADER = 0x010000,// make it bigger than 0xFF in case of
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SC_PKT_ASF_MEDIA = 0x010001,// receiving false data packets.
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/*@}*/
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} MMSSCPacketType;
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typedef struct MMSTContext {
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MMSContext mms;
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int outgoing_packet_seq; ///< Outgoing packet sequence number.
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char path[256]; ///< Path of the resource being asked for.
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char host[128]; ///< Host of the resources.
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int incoming_packet_seq; ///< Incoming packet sequence number.
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int incoming_flags; ///< Incoming packet flags.
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int packet_id; ///< Identifier for packets in the current stream.
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unsigned int header_packet_id; ///< default is 2.
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} MMSTContext;
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/** Create MMST command packet header */
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static void start_command_packet(MMSTContext *mmst, MMSCSPacketType packet_type)
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{
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MMSContext *mms = &mmst->mms;
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mms->write_out_ptr = mms->out_buffer;
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bytestream_put_le32(&mms->write_out_ptr, 1); // start sequence
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bytestream_put_le32(&mms->write_out_ptr, 0xb00bface);
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bytestream_put_le32(&mms->write_out_ptr, 0); // Length starts from after the protocol type bytes
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bytestream_put_le32(&mms->write_out_ptr, MKTAG('M','M','S',' '));
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bytestream_put_le32(&mms->write_out_ptr, 0);
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bytestream_put_le32(&mms->write_out_ptr, mmst->outgoing_packet_seq++);
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bytestream_put_le64(&mms->write_out_ptr, 0); // timestamp
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bytestream_put_le32(&mms->write_out_ptr, 0);
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bytestream_put_le16(&mms->write_out_ptr, packet_type);
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bytestream_put_le16(&mms->write_out_ptr, 3); // direction to server
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}
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/** Add prefixes to MMST command packet. */
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static void insert_command_prefixes(MMSContext *mms,
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uint32_t prefix1, uint32_t prefix2)
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{
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bytestream_put_le32(&mms->write_out_ptr, prefix1); // first prefix
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bytestream_put_le32(&mms->write_out_ptr, prefix2); // second prefix
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}
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/** Send a prepared MMST command packet. */
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static int send_command_packet(MMSTContext *mmst)
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{
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MMSContext *mms = &mmst->mms;
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int len= mms->write_out_ptr - mms->out_buffer;
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int exact_length = FFALIGN(len, 8);
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int first_length= exact_length - 16;
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int len8= first_length/8;
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int write_result;
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// update packet length fields.
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AV_WL32(mms->out_buffer + 8, first_length);
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AV_WL32(mms->out_buffer + 16, len8);
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AV_WL32(mms->out_buffer + 32, len8-2);
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memset(mms->write_out_ptr, 0, exact_length - len);
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// write it out.
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write_result= ffurl_write(mms->mms_hd, mms->out_buffer, exact_length);
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if(write_result != exact_length) {
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av_log(NULL, AV_LOG_ERROR,
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"Failed to write data of length %d: %d (%s)\n",
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exact_length, write_result,
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write_result < 0 ? strerror(AVUNERROR(write_result)) :
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"The server closed the connection");
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return AVERROR(EIO);
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}
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return 0;
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}
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static int mms_put_utf16(MMSContext *mms, const uint8_t *src)
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{
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AVIOContext bic;
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int size = mms->write_out_ptr - mms->out_buffer;
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int len;
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ffio_init_context(&bic, mms->write_out_ptr,
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sizeof(mms->out_buffer) - size, 1, NULL, NULL, NULL, NULL);
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len = avio_put_str16le(&bic, src);
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if (len < 0)
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return len;
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mms->write_out_ptr += len;
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return 0;
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}
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static int send_time_test_data(MMSTContext *mmst)
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{
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start_command_packet(mmst, CS_PKT_TIMING_DATA_REQUEST);
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insert_command_prefixes(&mmst->mms, 0x00f0f0f0, 0x0004000b);
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return send_command_packet(mmst);
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}
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static int send_protocol_select(MMSTContext *mmst)
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{
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int ret;
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char data_string[256];
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MMSContext *mms = &mmst->mms;
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start_command_packet(mmst, CS_PKT_PROTOCOL_SELECT);
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insert_command_prefixes(mms, 0, 0xffffffff);
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bytestream_put_le32(&mms->write_out_ptr, 0); // maxFunnelBytes
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bytestream_put_le32(&mms->write_out_ptr, 0x00989680); // maxbitRate
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bytestream_put_le32(&mms->write_out_ptr, 2); // funnelMode
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snprintf(data_string, sizeof(data_string), "\\\\%d.%d.%d.%d\\%s\\%d",
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(LOCAL_ADDRESS>>24)&0xff,
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(LOCAL_ADDRESS>>16)&0xff,
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(LOCAL_ADDRESS>>8)&0xff,
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LOCAL_ADDRESS&0xff,
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"TCP", // or UDP
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LOCAL_PORT);
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if ((ret = mms_put_utf16(mms, data_string)) < 0)
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return ret;
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return send_command_packet(mmst);
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}
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static int send_media_file_request(MMSTContext *mmst)
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{
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int ret;
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MMSContext *mms = &mmst->mms;
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start_command_packet(mmst, CS_PKT_MEDIA_FILE_REQUEST);
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insert_command_prefixes(mms, 1, 0xffffffff);
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bytestream_put_le32(&mms->write_out_ptr, 0);
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bytestream_put_le32(&mms->write_out_ptr, 0);
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if ((ret = mms_put_utf16(mms, mmst->path + 1)) < 0) // +1 for skip "/"
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return ret;
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return send_command_packet(mmst);
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}
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static void handle_packet_stream_changing_type(MMSTContext *mmst)
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{
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MMSContext *mms = &mmst->mms;
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av_log(NULL, AV_LOG_TRACE, "Stream changing!\n");
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// 40 is the packet header size, 7 is the prefix size.
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mmst->header_packet_id= AV_RL32(mms->in_buffer + 40 + 7);
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av_log(NULL, AV_LOG_TRACE, "Changed header prefix to 0x%x", mmst->header_packet_id);
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}
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static int send_keepalive_packet(MMSTContext *mmst)
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{
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// respond to a keepalive with a keepalive...
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start_command_packet(mmst, CS_PKT_KEEPALIVE);
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insert_command_prefixes(&mmst->mms, 1, 0x100FFFF);
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return send_command_packet(mmst);
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}
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/** Pad media packets smaller than max_packet_size and/or adjust read position
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* after a seek. */
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static void pad_media_packet(MMSContext *mms)
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{
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if(mms->remaining_in_len<mms->asf_packet_len) {
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int padding_size = mms->asf_packet_len - mms->remaining_in_len;
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memset(mms->in_buffer + mms->remaining_in_len, 0, padding_size);
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mms->remaining_in_len += padding_size;
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}
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}
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/** Read incoming MMST media, header or command packet. */
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static MMSSCPacketType get_tcp_server_response(MMSTContext *mmst)
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{
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int read_result;
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MMSSCPacketType packet_type= -1;
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MMSContext *mms = &mmst->mms;
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for(;;) {
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read_result = ffurl_read_complete(mms->mms_hd, mms->in_buffer, 8);
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if (read_result != 8) {
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if(read_result < 0) {
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av_log(NULL, AV_LOG_ERROR,
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"Error reading packet header: %d (%s)\n",
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read_result, strerror(AVUNERROR(read_result)));
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packet_type = SC_PKT_CANCEL;
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} else {
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av_log(NULL, AV_LOG_ERROR,
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"The server closed the connection\n");
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packet_type = SC_PKT_NO_DATA;
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}
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return packet_type;
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}
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// handle command packet.
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if(AV_RL32(mms->in_buffer + 4)==0xb00bface) {
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int length_remaining, hr;
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mmst->incoming_flags= mms->in_buffer[3];
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read_result= ffurl_read_complete(mms->mms_hd, mms->in_buffer+8, 4);
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if(read_result != 4) {
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av_log(NULL, AV_LOG_ERROR,
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"Reading command packet length failed: %d (%s)\n",
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read_result,
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read_result < 0 ? strerror(AVUNERROR(read_result)) :
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"The server closed the connection");
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return read_result < 0 ? read_result : AVERROR(EIO);
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}
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length_remaining= AV_RL32(mms->in_buffer+8) + 4;
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av_log(NULL, AV_LOG_TRACE, "Length remaining is %d\n", length_remaining);
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// read the rest of the packet.
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if (length_remaining < 0
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|| length_remaining > sizeof(mms->in_buffer) - 12) {
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av_log(NULL, AV_LOG_ERROR,
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"Incoming packet length %d exceeds bufsize %"SIZE_SPECIFIER"\n",
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length_remaining, sizeof(mms->in_buffer) - 12);
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return AVERROR_INVALIDDATA;
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}
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read_result = ffurl_read_complete(mms->mms_hd, mms->in_buffer + 12,
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length_remaining) ;
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if (read_result != length_remaining) {
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av_log(NULL, AV_LOG_ERROR,
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"Reading pkt data (length=%d) failed: %d (%s)\n",
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length_remaining, read_result,
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read_result < 0 ? strerror(AVUNERROR(read_result)) :
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"The server closed the connection");
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return read_result < 0 ? read_result : AVERROR(EIO);
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}
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packet_type= AV_RL16(mms->in_buffer+36);
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if (read_result >= 44 && (hr = AV_RL32(mms->in_buffer + 40))) {
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av_log(NULL, AV_LOG_ERROR,
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"Server sent a message with packet type 0x%x and error status code 0x%08x\n", packet_type, hr);
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return AVERROR(EINVAL);
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}
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} else {
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int length_remaining;
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int packet_id_type;
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int tmp;
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// note we cache the first 8 bytes,
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// then fill up the buffer with the others
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tmp = AV_RL16(mms->in_buffer + 6);
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length_remaining = (tmp - 8) & 0xffff;
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mmst->incoming_packet_seq = AV_RL32(mms->in_buffer);
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packet_id_type = mms->in_buffer[4];
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mmst->incoming_flags = mms->in_buffer[5];
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if (length_remaining < 0
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|| length_remaining > sizeof(mms->in_buffer) - 8) {
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av_log(NULL, AV_LOG_ERROR,
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"Data length %d is invalid or too large (max=%"SIZE_SPECIFIER")\n",
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length_remaining, sizeof(mms->in_buffer));
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return AVERROR_INVALIDDATA;
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}
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mms->remaining_in_len = length_remaining;
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mms->read_in_ptr = mms->in_buffer;
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read_result= ffurl_read_complete(mms->mms_hd, mms->in_buffer, length_remaining);
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if(read_result != length_remaining) {
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av_log(NULL, AV_LOG_ERROR,
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"Failed to read packet data of size %d: %d (%s)\n",
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length_remaining, read_result,
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read_result < 0 ? strerror(AVUNERROR(read_result)) :
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"The server closed the connection");
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return read_result < 0 ? read_result : AVERROR(EIO);
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}
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// if we successfully read everything.
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if(packet_id_type == mmst->header_packet_id) {
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int err;
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packet_type = SC_PKT_ASF_HEADER;
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// Store the asf header
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if(!mms->header_parsed) {
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if ((err = av_reallocp(&mms->asf_header,
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mms->asf_header_size +
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mms->remaining_in_len)) < 0) {
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mms->asf_header_size = 0;
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return err;
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}
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memcpy(mms->asf_header + mms->asf_header_size,
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mms->read_in_ptr, mms->remaining_in_len);
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mms->asf_header_size += mms->remaining_in_len;
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}
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// 0x04 means asf header is sent in multiple packets.
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if (mmst->incoming_flags == 0x04)
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continue;
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} else if(packet_id_type == mmst->packet_id) {
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packet_type = SC_PKT_ASF_MEDIA;
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} else {
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av_log(NULL, AV_LOG_TRACE, "packet id type %d is old.", packet_id_type);
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continue;
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}
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}
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// preprocess some packet type
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if(packet_type == SC_PKT_KEEPALIVE) {
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send_keepalive_packet(mmst);
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continue;
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} else if(packet_type == SC_PKT_STREAM_CHANGING) {
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handle_packet_stream_changing_type(mmst);
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} else if(packet_type == SC_PKT_ASF_MEDIA) {
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pad_media_packet(mms);
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}
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return packet_type;
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}
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}
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static int mms_safe_send_recv(MMSTContext *mmst,
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int (*send_fun)(MMSTContext *mmst),
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const MMSSCPacketType expect_type)
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{
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MMSSCPacketType type;
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if(send_fun) {
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int ret = send_fun(mmst);
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if (ret < 0) {
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av_log(NULL, AV_LOG_TRACE, "Send Packet error before expecting recv packet %d\n", expect_type);
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return ret;
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}
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}
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if ((type = get_tcp_server_response(mmst)) != expect_type) {
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av_log(NULL, AV_LOG_ERROR,
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"Corrupt stream (unexpected packet type 0x%x, expected 0x%x)\n",
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type, expect_type);
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return AVERROR_INVALIDDATA;
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} else {
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return 0;
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}
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}
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static int send_media_header_request(MMSTContext *mmst)
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{
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MMSContext *mms = &mmst->mms;
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start_command_packet(mmst, CS_PKT_MEDIA_HEADER_REQUEST);
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insert_command_prefixes(mms, 1, 0);
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bytestream_put_le32(&mms->write_out_ptr, 0);
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bytestream_put_le32(&mms->write_out_ptr, 0x00800000);
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bytestream_put_le32(&mms->write_out_ptr, 0xffffffff);
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bytestream_put_le32(&mms->write_out_ptr, 0);
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bytestream_put_le32(&mms->write_out_ptr, 0);
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bytestream_put_le32(&mms->write_out_ptr, 0);
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// the media preroll value in milliseconds?
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bytestream_put_le32(&mms->write_out_ptr, 0);
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bytestream_put_le32(&mms->write_out_ptr, 0x40AC2000);
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bytestream_put_le32(&mms->write_out_ptr, 2);
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bytestream_put_le32(&mms->write_out_ptr, 0);
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return send_command_packet(mmst);
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}
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/** Send the initial handshake. */
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static int send_startup_packet(MMSTContext *mmst)
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{
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char data_string[256];
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int ret;
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MMSContext *mms = &mmst->mms;
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// SubscriberName is defined in MS specification linked below.
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// The guid value can be any valid value.
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// http://download.microsoft.com/
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// download/9/5/E/95EF66AF-9026-4BB0-A41D-A4F81802D92C/%5BMS-WMSP%5D.pdf
|
|
snprintf(data_string, sizeof(data_string),
|
|
"NSPlayer/7.0.0.1956; {%s}; Host: %s",
|
|
"7E667F5D-A661-495E-A512-F55686DDA178", mmst->host);
|
|
|
|
start_command_packet(mmst, CS_PKT_INITIAL);
|
|
insert_command_prefixes(mms, 0, 0x0004000b);
|
|
bytestream_put_le32(&mms->write_out_ptr, 0x0003001c);
|
|
if ((ret = mms_put_utf16(mms, data_string)) < 0)
|
|
return ret;
|
|
return send_command_packet(mmst);
|
|
}
|
|
|
|
/** Send MMST stream selection command based on the AVStream->discard values. */
|
|
static int send_stream_selection_request(MMSTContext *mmst)
|
|
{
|
|
int i;
|
|
MMSContext *mms = &mmst->mms;
|
|
// send the streams we want back...
|
|
start_command_packet(mmst, CS_PKT_STREAM_ID_REQUEST);
|
|
bytestream_put_le32(&mms->write_out_ptr, mms->stream_num); // stream nums
|
|
for(i= 0; i<mms->stream_num; i++) {
|
|
bytestream_put_le16(&mms->write_out_ptr, 0xffff); // flags
|
|
bytestream_put_le16(&mms->write_out_ptr, mms->streams[i].id); // stream id
|
|
bytestream_put_le16(&mms->write_out_ptr, 0); // selection
|
|
}
|
|
return send_command_packet(mmst);
|
|
}
|
|
|
|
static int send_close_packet(MMSTContext *mmst)
|
|
{
|
|
start_command_packet(mmst, CS_PKT_STREAM_CLOSE);
|
|
insert_command_prefixes(&mmst->mms, 1, 1);
|
|
|
|
return send_command_packet(mmst);
|
|
}
|
|
|
|
/** Close the MMSH/MMST connection */
|
|
static int mms_close(URLContext *h)
|
|
{
|
|
MMSTContext *mmst = (MMSTContext *)h->priv_data;
|
|
MMSContext *mms = &mmst->mms;
|
|
if(mms->mms_hd) {
|
|
send_close_packet(mmst);
|
|
ffurl_close(mms->mms_hd);
|
|
}
|
|
|
|
/* free all separately allocated pointers in mms */
|
|
av_freep(&mms->streams);
|
|
av_freep(&mms->asf_header);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int send_media_packet_request(MMSTContext *mmst)
|
|
{
|
|
MMSContext *mms = &mmst->mms;
|
|
start_command_packet(mmst, CS_PKT_START_FROM_PKT_ID);
|
|
insert_command_prefixes(mms, 1, 0x0001FFFF);
|
|
bytestream_put_le64(&mms->write_out_ptr, 0); // seek timestamp
|
|
bytestream_put_le32(&mms->write_out_ptr, 0xffffffff); // unknown
|
|
bytestream_put_le32(&mms->write_out_ptr, 0xffffffff); // packet offset
|
|
bytestream_put_byte(&mms->write_out_ptr, 0xff); // max stream time limit
|
|
bytestream_put_byte(&mms->write_out_ptr, 0xff); // max stream time limit
|
|
bytestream_put_byte(&mms->write_out_ptr, 0xff); // max stream time limit
|
|
bytestream_put_byte(&mms->write_out_ptr, 0x00); // stream time limit flag
|
|
|
|
mmst->packet_id++; // new packet_id
|
|
bytestream_put_le32(&mms->write_out_ptr, mmst->packet_id);
|
|
return send_command_packet(mmst);
|
|
}
|
|
|
|
|
|
static void clear_stream_buffers(MMSContext *mms)
|
|
{
|
|
mms->remaining_in_len = 0;
|
|
mms->read_in_ptr = mms->in_buffer;
|
|
}
|
|
|
|
static int mms_open(URLContext *h, const char *uri, int flags)
|
|
{
|
|
MMSTContext *mmst = h->priv_data;
|
|
MMSContext *mms;
|
|
int port, err;
|
|
char tcpname[256];
|
|
|
|
h->is_streamed = 1;
|
|
mms = &mmst->mms;
|
|
|
|
// only for MMS over TCP, so set proto = NULL
|
|
av_url_split(NULL, 0, NULL, 0,
|
|
mmst->host, sizeof(mmst->host), &port, mmst->path,
|
|
sizeof(mmst->path), uri);
|
|
|
|
if(port<0)
|
|
port = 1755; // defaut mms protocol port
|
|
|
|
// establish tcp connection.
|
|
ff_url_join(tcpname, sizeof(tcpname), "tcp", NULL, mmst->host, port, NULL);
|
|
err = ffurl_open_whitelist(&mms->mms_hd, tcpname, AVIO_FLAG_READ_WRITE,
|
|
&h->interrupt_callback, NULL,
|
|
h->protocol_whitelist, h->protocol_blacklist);
|
|
if (err)
|
|
goto fail;
|
|
|
|
mmst->packet_id = 3; // default, initial value.
|
|
mmst->header_packet_id = 2; // default, initial value.
|
|
err = mms_safe_send_recv(mmst, send_startup_packet, SC_PKT_CLIENT_ACCEPTED);
|
|
if (err)
|
|
goto fail;
|
|
err = mms_safe_send_recv(mmst, send_time_test_data, SC_PKT_TIMING_TEST_REPLY);
|
|
if (err)
|
|
goto fail;
|
|
err = mms_safe_send_recv(mmst, send_protocol_select, SC_PKT_PROTOCOL_ACCEPTED);
|
|
if (err)
|
|
goto fail;
|
|
err = mms_safe_send_recv(mmst, send_media_file_request, SC_PKT_MEDIA_FILE_DETAILS);
|
|
if (err)
|
|
goto fail;
|
|
err = mms_safe_send_recv(mmst, send_media_header_request, SC_PKT_HEADER_REQUEST_ACCEPTED);
|
|
if (err)
|
|
goto fail;
|
|
err = mms_safe_send_recv(mmst, NULL, SC_PKT_ASF_HEADER);
|
|
if (err)
|
|
goto fail;
|
|
if((mmst->incoming_flags != 0X08) && (mmst->incoming_flags != 0X0C)) {
|
|
av_log(NULL, AV_LOG_ERROR,
|
|
"The server does not support MMST (try MMSH or RTSP)\n");
|
|
err = AVERROR(EINVAL);
|
|
goto fail;
|
|
}
|
|
err = ff_mms_asf_header_parser(mms);
|
|
if (err) {
|
|
av_log(NULL, AV_LOG_TRACE, "asf header parsed failed!\n");
|
|
goto fail;
|
|
}
|
|
mms->header_parsed = 1;
|
|
|
|
if (!mms->asf_packet_len || !mms->stream_num)
|
|
goto fail;
|
|
|
|
clear_stream_buffers(mms);
|
|
err = mms_safe_send_recv(mmst, send_stream_selection_request, SC_PKT_STREAM_ID_ACCEPTED);
|
|
if (err)
|
|
goto fail;
|
|
// send media packet request
|
|
err = mms_safe_send_recv(mmst, send_media_packet_request, SC_PKT_MEDIA_PKT_FOLLOWS);
|
|
if (err) {
|
|
goto fail;
|
|
}
|
|
av_log(NULL, AV_LOG_TRACE, "Leaving open (success)\n");
|
|
return 0;
|
|
fail:
|
|
mms_close(h);
|
|
av_log(NULL, AV_LOG_TRACE, "Leaving open (failure: %d)\n", err);
|
|
return err;
|
|
}
|
|
|
|
/** Read ASF data through the protocol. */
|
|
static int mms_read(URLContext *h, uint8_t *buf, int size)
|
|
{
|
|
/* TODO: see tcp.c:tcp_read() about a possible timeout scheme */
|
|
MMSTContext *mmst = h->priv_data;
|
|
MMSContext *mms = &mmst->mms;
|
|
int result = 0;
|
|
|
|
do {
|
|
if(mms->asf_header_read_size < mms->asf_header_size) {
|
|
/* Read from ASF header buffer */
|
|
result = ff_mms_read_header(mms, buf, size);
|
|
} else if(mms->remaining_in_len) {
|
|
/* Read remaining packet data to buffer.
|
|
* the result can not be zero because remaining_in_len is positive.*/
|
|
result = ff_mms_read_data(mms, buf, size);
|
|
} else {
|
|
/* Read from network */
|
|
int err = mms_safe_send_recv(mmst, NULL, SC_PKT_ASF_MEDIA);
|
|
if (err == 0) {
|
|
if(mms->remaining_in_len>mms->asf_packet_len) {
|
|
av_log(NULL, AV_LOG_ERROR,
|
|
"Incoming pktlen %d is larger than ASF pktsize %d\n",
|
|
mms->remaining_in_len, mms->asf_packet_len);
|
|
result= AVERROR(EIO);
|
|
} else {
|
|
// copy the data to the packet buffer.
|
|
result = ff_mms_read_data(mms, buf, size);
|
|
if (result == 0) {
|
|
av_log(NULL, AV_LOG_TRACE, "Read ASF media packet size is zero!\n");
|
|
break;
|
|
}
|
|
}
|
|
} else {
|
|
av_log(NULL, AV_LOG_TRACE, "read packet error!\n");
|
|
break;
|
|
}
|
|
}
|
|
} while(!result); // only return one packet.
|
|
return result;
|
|
}
|
|
|
|
const URLProtocol ff_mmst_protocol = {
|
|
.name = "mmst",
|
|
.url_open = mms_open,
|
|
.url_read = mms_read,
|
|
.url_close = mms_close,
|
|
.priv_data_size = sizeof(MMSTContext),
|
|
.flags = URL_PROTOCOL_FLAG_NETWORK,
|
|
};
|