mpc.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:7k
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: mpc.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 "mpc.h"
- #include "libmusepack/include/musepack/musepack.h"
- typedef struct mpc
- {
- format_base Format;
- mpc_reader Reader;
- mpc_decoder Decoder;
- mpc_streaminfo Info;
- MPC_SAMPLE_FORMAT* Buffer;
- int SampleRate;
- int SampleSize;
- int64_t Samples;
- mpc_uint16_t* SeekTable;
- } mpc;
- static void Done(mpc* p)
- {
- free(p->SeekTable);
- p->SeekTable = NULL;
- free(p->Buffer);
- p->Buffer = NULL;
- }
- static int Init(mpc* p)
- {
- format_stream* s;
- p->Format.HeaderLoaded = 1;
- p->Format.TimeStamps = 0;
- mpc_streaminfo_init(&p->Info);
- p->Samples = 0;
- p->Buffer = (MPC_SAMPLE_FORMAT*)malloc(sizeof(MPC_SAMPLE_FORMAT)*MPC_DECODER_BUFFER_LENGTH);
- if (!p->Buffer)
- return ERR_OUT_OF_MEMORY;
- if (mpc_streaminfo_read(&p->Info,&p->Reader) != ERROR_CODE_OK)
- return ERR_INVALID_DATA;
- s = Format_AddStream(&p->Format,sizeof(format_stream));
- if (s)
- {
- PacketFormatClear(&s->Format);
- s->Format.Type = PACKET_AUDIO;
- s->Format.Format.Audio.Format = AUDIOFMT_PCM;
- s->Format.Format.Audio.Bits = MPC_FIXED_POINT_SCALE_SHIFT;
- s->Format.Format.Audio.SampleRate = p->Info.sample_freq;
- s->Format.Format.Audio.Channels = p->Info.channels;
- PacketFormatDefault(&s->Format);
- s->Format.ByteRate = (int)p->Info.average_bitrate >> 3;
- s->PacketBurst = 1;
- s->Fragmented = 1;
- s->DisableDrop = 1;
- p->Format.Duration = (tick_t)((p->Info.pcm_samples * TICKSPERSEC) / p->Info.sample_freq);
- Format_PrepairStream(&p->Format,s);
- if (p->Format.Comment.Node)
- {
- // id3v1
- format_reader* Reader = p->Format.Reader;
- char Buffer[ID3V1_SIZE];
- filepos_t Save = Reader->Input->Seek(Reader->Input,0,SEEK_CUR);
- if (Save>=0 && Reader->Input->Seek(Reader->Input,-(int)sizeof(Buffer),SEEK_END)>=0)
- {
- if (Reader->Input->Read(Reader->Input,Buffer,sizeof(Buffer)) == sizeof(Buffer))
- ID3v1_Parse(Buffer,&p->Format.Comment);
- Reader->Input->Seek(Reader->Input,Save,SEEK_SET);
- }
- if (p->Info.header_position>0)
- {
- // id3v2
- filepos_t Save = Reader->FilePos;
- if (Reader->Seek(Reader,0,SEEK_SET)==ERR_NONE)
- {
- void* Buffer = malloc(p->Info.header_position);
- if (Buffer)
- {
- int Len = Reader->Read(Reader,Buffer,p->Info.header_position);
- ID3v2_Parse(Buffer,Len,&p->Format.Comment,0);
- free(Buffer);
- }
- Reader->Seek(Reader,Save,SEEK_SET);
- }
- }
- }
- }
- mpc_decoder_setup(&p->Decoder,&p->Reader);
- p->SeekTable = (mpc_uint16_t*)malloc(sizeof(mpc_uint16_t)*(p->Info.frames+64));
- if (p->SeekTable)
- {
- memset(p->SeekTable,0,sizeof(mpc_uint16_t)*(p->Info.frames+64));
- p->Decoder.SeekTable = p->SeekTable;
- }
- if (!mpc_decoder_initialize(&p->Decoder, &p->Info))
- return ERR_INVALID_DATA;
- p->SampleRate = p->Info.sample_freq;
- p->SampleSize = p->Info.channels * sizeof(MPC_SAMPLE_FORMAT);
- return ERR_NONE;
- }
- static int Seek(mpc* p, tick_t Time, int FilePos, bool_t PrevKey)
- {
- int64_t Samples;
- if (Time < 0)
- {
- if (FilePos<0 || p->Format.FileSize<0)
- return ERR_NOT_SUPPORTED;
- Time = Scale(FilePos,p->Format.Duration,p->Format.FileSize);
- }
- Samples = ((int64_t)Time * p->SampleRate+(TICKSPERSEC/2)) / TICKSPERSEC;
- if (!mpc_decoder_seek_sample(&p->Decoder,Samples))
- return ERR_NOT_SUPPORTED;
- p->Samples = Samples;
- return ERR_NONE;
- }
- static int Process(mpc* p,format_stream* Stream)
- {
- int Result = ERR_NONE;
- int Samples,No,Burst;
- if (Stream->Pending)
- {
- Result = Format_Send(&p->Format,Stream);
- if (Result == ERR_BUFFER_FULL || Result == ERR_SYNCED)
- return Result;
- }
- Burst = Stream->PacketBurst;
- for (No=0;No<Burst;++No)
- {
- if (p->Format.Reader[0].BufferAvailable < (MINBUFFER/2) &&
- !p->Format.Reader[0].NoMoreInput)
- return ERR_NEED_MORE_DATA;
- Samples = mpc_decoder_decode(&p->Decoder,p->Buffer,NULL,NULL);
- if (Samples == -1)
- return ERR_INVALID_DATA;
- if (Samples == 0)
- return Format_CheckEof(&p->Format,Stream);
- Stream->Packet.RefTime = (tick_t)((p->Samples * TICKSPERSEC) / p->SampleRate);
- Stream->Packet.Data[0] = p->Buffer;
- Stream->Packet.Length = Samples * p->SampleSize;
- Stream->Pending = 1;
- p->Samples += Samples;
- Result = Format_Send(&p->Format,Stream);
- if (Result == ERR_BUFFER_FULL || Result == ERR_SYNCED)
- break;
- }
- if (Result == ERR_BUFFER_FULL || Result == ERR_NEED_MORE_DATA)
- Result = ERR_NONE;
- return Result;
- }
- static mpc_int32_t IORead(void *data, void *ptr, mpc_int32_t size)
- {
- format_reader* Reader = (format_reader*)data;
- return Reader->Read(Reader,ptr,size);
- }
- static mpc_bool_t IOSeek(void *data, mpc_int32_t offset)
- {
- format_reader* Reader = (format_reader*)data;
- return (mpc_bool_t)(Format_Seek(Reader->Format,(filepos_t)offset,SEEK_SET) == ERR_NONE);
- }
- static mpc_int32_t IOTell(void *data)
- {
- format_reader* Reader = (format_reader*)data;
- return Reader->FilePos;
- }
- static mpc_int32_t IOGetSize(void *data)
- {
- format_reader* Reader = (format_reader*)data;
- if (Reader->Format->FileSize < 0)
- return 0;
- return Reader->Format->FileSize;
- }
- static mpc_bool_t IOCanSeek(void *data)
- {
- return 1;
- }
- static int Create(mpc* p)
- {
- p->Format.Init = (fmtfunc) Init;
- p->Format.Done = (fmtvoid) Done;
- p->Format.Seek = (fmtseek) Seek;
- p->Format.Process = (fmtstreamprocess) Process;
- p->Format.FillQueue = NULL;
- p->Format.ReadPacket = NULL;
- p->Format.Sended = NULL;
- p->Reader.data = p->Format.Reader;
- p->Reader.read = IORead;
- p->Reader.seek = IOSeek;
- p->Reader.tell = IOTell;
- p->Reader.get_size = IOGetSize;
- p->Reader.canseek = IOCanSeek;
- return ERR_NONE;
- }
- static const nodedef MPC =
- {
- sizeof(mpc),
- MPC_ID,
- FORMATBASE_CLASS,
- PRI_DEFAULT,
- (nodecreate)Create,
- };
- void MPC_Init()
- {
- NodeRegisterClass(&MPC);
- }
- void MPC_Done()
- {
- NodeUnRegisterClass(MPC_ID);
- }