wavpack.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) 2006 Jory 'jcsston' Stone
- *
- ****************************************************************************/
- #include "../common/common.h"
- #include "wavpack.h"
- #include "decoder/wavpack.h"
- #define WAVPACK_BLOCK_LEN 512
- typedef struct wavpack
- {
- format_base Format;
- WavpackContext *Decoder;
- long* Buffer;
- int BufferLen;
- int BufferFilled;
- int Bps;
- int Channels;
- int SampleRate;
- int SampleSize;
- int64_t Samples;
- int64_t FileLen;
- char Error[80];
- } wavpack;
- // wavpack callbacks
- static long read_bytes(void *buff, long bcount, void *privdata)
- {
- format_reader* Reader = ((wavpack *)privdata)->Format.Reader;
- return Reader->Read(Reader,buff,bcount);
- }
- // Reformat samples from longs in processor's native endian mode to
- // little-endian data with (possibly) less than 4 bytes / sample.
- static uchar *format_samples(int bps, uchar *dst, long *src, ulong samcnt)
- {
- long temp;
- switch (bps)
- {
- case 1:
- while (samcnt--)
- *dst++ = (uchar)(*src++ + 128);
- break;
- case 2:
- while (samcnt--)
- {
- *dst++ = (uchar)(temp = *src++);
- *dst++ = (uchar)(temp >> 8);
- }
- break;
- case 3:
- while (samcnt--)
- {
- *dst++ = (uchar)(temp = *src++);
- *dst++ = (uchar)(temp >> 8);
- *dst++ = (uchar)(temp >> 16);
- }
- break;
- case 4:
- while (samcnt--)
- {
- *dst++ = (uchar)(temp = *src++);
- *dst++ = (uchar)(temp >> 8);
- *dst++ = (uchar)(temp >> 16);
- *dst++ = (uchar)(temp >> 24);
- }
- break;
- }
- return dst;
- }
- static void Done(wavpack* p)
- {
- free(p->Buffer);
- p->Buffer = NULL;
- if (p->Decoder != NULL)
- {
- WavpackClose(p->Decoder);
- p->Decoder = NULL;
- }
- }
- static int Init(wavpack* p)
- {
- format_stream* s;
- p->Format.HeaderLoaded = 1;
- p->Format.TimeStamps = 0;
- p->Decoder = WavpackOpenFileInput(read_bytes, p->Error, p);
- p->Samples = 0;
- s = Format_AddStream(&p->Format,sizeof(format_stream));
- if (s)
- {
- if (WavpackGetMode (p->Decoder) & MODE_FLOAT) {
- // Floating point?
- return ERR_NOT_SUPPORTED;
- }
- PacketFormatClear(&s->Format);
- s->Format.Type = PACKET_AUDIO;
- s->Format.Format.Audio.Format = AUDIOFMT_PCM;
- s->Format.Format.Audio.Bits = WavpackGetBitsPerSample(p->Decoder);
- s->Format.Format.Audio.SampleRate = WavpackGetSampleRate(p->Decoder);
- s->Format.Format.Audio.Channels = WavpackGetNumChannels(p->Decoder);
- PacketFormatDefault(&s->Format);
- if (p->Format.FileSize>0)
- s->Format.ByteRate = (int) (((float) p->Format.FileSize / WavpackGetNumSamples(p->Decoder) * s->Format.Format.Audio.Channels * s->Format.Format.Audio.Bits / 8) * s->Format.Format.Audio.SampleRate * s->Format.Format.Audio.Channels
- * s->Format.Format.Audio.Bits
- / 128);
- s->PacketBurst = 1;
- s->Fragmented = 1;
- s->DisableDrop = 1;
- p->Format.Duration = (tick_t)(((int64_t)WavpackGetNumSamples(p->Decoder) * TICKSPERSEC) / s->Format.Format.Audio.SampleRate);
- Format_PrepairStream(&p->Format,s);
- p->Bps = WavpackGetBytesPerSample(p->Decoder);
- p->Channels = s->Format.Format.Audio.Channels;
- p->SampleRate = s->Format.Format.Audio.SampleRate;
- p->SampleSize = s->Format.Format.Audio.Channels * sizeof(int16_t);
- 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);
- }
- }
- p->BufferLen = WAVPACK_BLOCK_LEN * p->Channels;
- p->Buffer = (long*)malloc(sizeof(long)*p->BufferLen);
- if (!p->Buffer)
- return ERR_OUT_OF_MEMORY;
- }
- return ERR_NONE;
- }
- static int Seek(wavpack* 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);
- }
- if (FilePos < 0)
- {
- if (Time<0 || p->Format.FileSize<0 || p->Format.Duration<0)
- return ERR_NOT_SUPPORTED;
- FilePos = Scale(Time,p->Format.FileSize,p->Format.Duration);
- }
- Samples = ((int64_t)Time * p->SampleRate+(TICKSPERSEC/2)) / TICKSPERSEC;
- WavpackFlush (p->Decoder);
- Format_Seek(&p->Format, (filepos_t)FilePos, SEEK_SET);
- p->Samples = Samples;
- return ERR_NONE;
- }
- static int Process(wavpack* p,format_stream* Stream)
- {
- int Result = ERR_NONE;
- if (Stream->Pending)
- {
- Result = Format_Send(&p->Format,Stream);
- if (Result == ERR_BUFFER_FULL || Result == ERR_SYNCED)
- return Result;
- }
- if (p->Format.Reader[0].BufferAvailable < (MINBUFFER/2) && !p->Format.Reader[0].NoMoreInput)
- return ERR_NEED_MORE_DATA;
- p->BufferFilled = 0;
- p->BufferFilled = WavpackUnpackSamples (p->Decoder, p->Buffer, WAVPACK_BLOCK_LEN);
- if (p->BufferFilled < 0)
- return ERR_INVALID_DATA;
- if (p->BufferFilled == 0)
- return Format_CheckEof(&p->Format,Stream);
- format_samples(p->Bps, (uchar *)p->Buffer, p->Buffer, p->BufferFilled * p->Channels);
- Stream->Packet.RefTime = (tick_t)((p->Samples * TICKSPERSEC) / p->SampleRate);
- Stream->Packet.Data[0] = p->Buffer;
- Stream->Packet.Length = p->BufferFilled * p->SampleSize;
- Stream->Pending = 1;
- p->Samples += p->BufferFilled;
- Result = Format_Send(&p->Format,Stream);
- if (Result == ERR_BUFFER_FULL || Result == ERR_NEED_MORE_DATA)
- Result = ERR_NONE;
- return Result;
- }
- static int Create(wavpack* 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;
- return ERR_NONE;
- }
- static const nodedef WVP =
- {
- sizeof(wavpack),
- WVP_ID,
- FORMATBASE_CLASS,
- PRI_DEFAULT,
- (nodecreate)Create,
- };
- void WVP_Init()
- {
- NodeRegisterClass(&WVP);
- }
- void WVP_Done()
- {
- NodeUnRegisterClass(WVP_ID);
- }