amrwb.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:3k
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: amrwb.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 "amrwb.h"
- #include "26204/dec_if.h"
- extern const UWord8 block_size[];
- typedef struct amrwb
- {
- codec Codec;
- buffer Buffer;
- void* Decoder;
- int16_t Synth[L_FRAME16k];
- } amrwb;
- static int UpdateInput(amrwb* p)
- {
- if (p->Decoder)
- {
- D_IF_exit(p->Decoder);
- p->Decoder = NULL;
- }
- BufferClear(&p->Buffer);
- if (p->Codec.In.Format.Type == PACKET_AUDIO)
- {
- p->Decoder = D_IF_init();
- if (!p->Decoder)
- return ERR_OUT_OF_MEMORY;
- p->Codec.In.Format.Format.Audio.SampleRate = 16000;
- p->Codec.In.Format.Format.Audio.Channels = 1;
- PacketFormatPCM(&p->Codec.Out.Format,&p->Codec.In.Format,16);
- }
- return ERR_NONE;
- }
- static int Process(amrwb* p, const packet* Packet, const flowstate* State)
- {
- int Size;
- if (Packet)
- {
- if (Packet->RefTime >= 0)
- p->Codec.Packet.RefTime = Packet->RefTime;
- // add new packet to buffer
- BufferPack(&p->Buffer,0);
- BufferWrite(&p->Buffer,Packet->Data[0],Packet->Length,256);
- }
- else
- p->Codec.Packet.RefTime = TIME_UNKNOWN;
- if (p->Buffer.WritePos - p->Buffer.ReadPos < 1)
- return ERR_NEED_MORE_DATA;
- if (p->Buffer.Data[p->Buffer.ReadPos] == '#' &&
- p->Buffer.WritePos - p->Buffer.ReadPos > 9 &&
- memcmp(p->Buffer.Data+p->Buffer.ReadPos,"#!AMR-WBn",9)==0)
- p->Buffer.ReadPos += 9;
- Size = block_size[(p->Buffer.Data[p->Buffer.ReadPos] >> 3) & 0xF];
- if (p->Buffer.WritePos - p->Buffer.ReadPos < Size)
- return ERR_NEED_MORE_DATA;
- D_IF_decode(p->Decoder, p->Buffer.Data+p->Buffer.ReadPos, p->Synth, _good_frame);
- p->Buffer.ReadPos += Size;
- p->Codec.Packet.Length = sizeof(p->Synth);
- p->Codec.Packet.Data[0] = p->Synth;
- return ERR_NONE;
- }
- extern void D_IF_reset(void*);
- static int Flush(amrwb* p)
- {
- if (p->Decoder)
- D_IF_reset(p->Decoder);
- return ERR_NONE;
- }
- static int Create(amrwb* p)
- {
- p->Codec.Process = (packetprocess)Process;
- p->Codec.UpdateInput = (nodefunc)UpdateInput;
- p->Codec.Flush = (nodefunc)Flush;
- return ERR_NONE;
- }
- static const nodedef AMRWB =
- {
- sizeof(amrwb),
- AMRWB_ID,
- CODEC_CLASS,
- PRI_DEFAULT,
- (nodecreate)Create,
- NULL,
- };
- static const nodedef AMRWBFile =
- {
- 0, //parent size
- AMRWB_FILE_ID,
- RAWAUDIO_CLASS,
- PRI_DEFAULT-5,
- };
- void AMRWB_Init()
- {
- NodeRegisterClass(&AMRWB);
- NodeRegisterClass(&AMRWBFile);
- }
- void AMRWB_Done()
- {
- NodeUnRegisterClass(AMRWB_ID);
- NodeUnRegisterClass(AMRWB_FILE_ID);
- }