mves.c
资源名称:tcpmp.rar [点击查看]
上传用户:wstnjxml
上传日期:2014-04-03
资源大小:7248k
文件大小:4k
源码类别:
Windows CE
开发平台:
C/C++
- /*****************************************************************************
- *
- * This program is free software ; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program 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 General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- * $Id: mves.c 543 2006-01-07 22:06:24Z picard $
- *
- * The Core Pocket Media Player
- * Copyright (c) 2004-2005 Gabor Kovacs
- *
- ****************************************************************************/
- #include "../common/common.h"
- #include "mpeg1.h"
- #include "mpeg_decode.h"
- #include "mpeg_stream.h"
- typedef struct mves
- {
- format_base Format;
- int LastSeekPos;
- tick_t LastSeekTime;
- } mves;
- static int Init(mves* p)
- {
- format_stream* s = Format_AddStream(&p->Format,sizeof(format_stream));
- if (s)
- {
- format_reader* Reader = p->Format.Reader;
- uint8_t Head[20];
- tchar_t URL[MAXPATH];
- PacketFormatClear(&s->Format);
- s->Format.Type = PACKET_VIDEO;
- s->Format.Format.Video.Pixel.Flags = PF_FOURCC | PF_FRAGMENTED;
- s->Format.Format.Video.Pixel.FourCC = FOURCC('M','P','E','G');
- if (p->Format.Reader->Input->Get(p->Format.Reader->Input,STREAM_URL,URL,sizeof(URL))==ERR_NONE &&
- CheckExts(URL,T("m4v:V")) != 0)
- s->Format.Format.Video.Pixel.FourCC = FOURCC('M','P','4','V');
- if (Reader->Read(Reader,Head,sizeof(Head))==sizeof(Head))
- {
- int i;
- if (Head[0]==0 && Head[1]==0 && (Head[2]>>2)==0x20)
- s->Format.Format.Video.Pixel.FourCC = FOURCC('H','2','6','3');
- else
- for (i=0;i<20-4;++i)
- if (Head[i]==0 && Head[i+1]==0 && Head[i+2]==1)
- {
- if (Head[i+3]==0xB0)
- s->Format.Format.Video.Pixel.FourCC = FOURCC('M','P','4','V');
- else
- if (Head[i+3]==0xB3)
- s->Format.Format.Video.Pixel.FourCC = FOURCC('M','P','E','G');
- break;
- }
- }
- Reader->Seek(Reader,0,SEEK_SET);
- s->Fragmented = 1;
- Format_PrepairStream(&p->Format,s);
- }
- p->LastSeekPos = 0;
- p->LastSeekTime = 0;
- return ERR_NONE;
- }
- static int Seek(mves* p, tick_t Time, filepos_t FilePos,bool_t PrevKey)
- {
- packetformat Format;
- format_stream* Stream = p->Format.Streams[0];
- Format.ByteRate = 0;
- if (Stream->Pin.Node)
- Stream->Pin.Node->Get(Stream->Pin.Node,Stream->Pin.No|PIN_FORMAT,&Format,sizeof(Format));
- if (FilePos < 0)
- {
- if (Time > 0)
- {
- if (Format.ByteRate)
- FilePos = Scale(Time,Format.ByteRate,TICKSPERSEC);
- else
- return ERR_NOT_SUPPORTED;
- }
- else
- FilePos = 0;
- }
- else
- if (Format.ByteRate)
- Time = Scale(FilePos,TICKSPERSEC,Format.ByteRate);
- else
- Time = 1; //don't care (just not zero)
- p->LastSeekPos = FilePos;
- p->LastSeekTime = Time;
- return Format_Seek(&p->Format,FilePos,SEEK_SET);
- }
- static int ReadPacket(mves* p, format_reader* Reader, format_packet* Packet)
- {
- format_stream* Stream = p->Format.Streams[0];
- if (Reader->FilePos==0)
- Packet->RefTime = 0;
- else
- if (Reader->FilePos==p->LastSeekPos)
- Packet->RefTime = p->LastSeekTime;
- else
- Packet->RefTime = TIME_UNKNOWN;
- Packet->Data = Reader->ReadAsRef(Reader,-4096);
- Packet->Stream = Stream;
- return ERR_NONE;
- }
- static int Create(mves* p)
- {
- p->Format.Init = (fmtfunc)Init;
- p->Format.Seek = (fmtseek)Seek;
- p->Format.ReadPacket = (fmtreadpacket)ReadPacket;
- p->Format.MinHeaderLoad = MINBUFFER/2;
- return ERR_NONE;
- }
- static const nodedef MVES =
- {
- sizeof(mves),
- MVES_ID,
- FORMATBASE_CLASS,
- PRI_DEFAULT-5,
- (nodecreate)Create,
- NULL,
- };
- void MVES_Init()
- {
- NodeRegisterClass(&MVES);
- }
- void MVES_Done()
- {
- NodeUnRegisterClass(MVES_ID);
- }