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Visual C++

CPI_Player_CoDec_OGG.c：源码内容
							
////////////////////////////////////////////////////////////////////////////////
#include "stdafx.h"
#include "globals.h"
#include "CPI_Stream.h"
#include "CPI_Player_CoDec.h"
#include "CPI_ID3.h"
#include "ogg/ogg.h"
#include "vorbis/codec.h"
#include "vorbis/vorbisfile.h"
////////////////////////////////////////////////////////////////////////////////
//
// This is the CoDec module - the basic idea is that the file will be opened and
// data will be sucked through the CoDec via calls to CPI_CoDec__GetPCMBlock
//
//
////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
//
typedef struct __CPs_CoDec_Ogg
{
//    HANDLE m_pInStream;
    CPs_InStream* m_pInStream;
    CPs_FileInfo m_FileInfo;
    HINSTANCE oggInstance;
    OggVorbis_File vf;
    int current_section;
} CPs_CoDec_Ogg;
//
//
////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
//
//
// Module functions
void CPP_OMOGG_Uninitialise(CPs_CoDecModule* pModule);
BOOL CPP_OMOGG_OpenFile(CPs_CoDecModule* pModule, const char* pcFilename, DWORD dwCookie, HWND hWndOwner);
void CPP_OMOGG_CloseFile(CPs_CoDecModule* pModule);
void CPP_OMOGG_Seek(CPs_CoDecModule* pModule, const int iNumerator, const int iDenominator);
void CPP_OMOGG_GetFileInfo(CPs_CoDecModule* pModule, CPs_FileInfo* pInfo);
//
BOOL CPP_OMOGG_GetPCMBlock(CPs_CoDecModule* pModule, void* pBlock, DWORD* pdwBlockSize);
int CPP_OMOGG_GetCurrentPos_secs(CPs_CoDecModule* pModule);
//
////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
//
//
//
void CP_InitialiseCodec_OGG(CPs_CoDecModule* pCoDec)
{
    CPs_CoDec_Ogg *pContext;
    // Setup functions
    pCoDec->Uninitialise = CPP_OMOGG_Uninitialise;
    pCoDec->OpenFile = CPP_OMOGG_OpenFile;
    pCoDec->CloseFile = CPP_OMOGG_CloseFile;
    pCoDec->Seek = CPP_OMOGG_Seek;
    pCoDec->GetFileInfo = CPP_OMOGG_GetFileInfo;
    pCoDec->GetPCMBlock = CPP_OMOGG_GetPCMBlock;
    pCoDec->GetCurrentPos_secs = CPP_OMOGG_GetCurrentPos_secs;
    // Setup private data
    pCoDec->m_pModuleCookie = malloc(sizeof(CPs_CoDec_Ogg));
    pContext = (CPs_CoDec_Ogg*)pCoDec->m_pModuleCookie;
//    pContext->m_pInStream = NULL;
	pContext->m_pInStream=NULL;
    CPFA_InitialiseFileAssociations(pCoDec);
    CPFA_AddFileAssociation(pCoDec, "OGG", 0L);
}
//
//
//
void CPP_OMOGG_Uninitialise(CPs_CoDecModule* pModule)
{
    CPs_CoDec_Ogg *pContext = (CPs_CoDec_Ogg*)pModule->m_pModuleCookie;
    CP_CHECKOBJECT(pContext);
//    CP_ASSERT(pContext->m_pInStream == NULL)
    CP_ASSERT(pContext->m_pInStream == NULL)
    free(pContext);
    CPFA_EmptyFileAssociations(pModule);
}
CPs_InStream* gInStream=NULL;
size_t CPP_OMOGG_cbRead(void *buffer, size_t size, size_t amount, void *file)
{
	size_t result=0;
	gInStream->Read(gInStream, buffer, size*amount, &result);
    return result;
}
int CPP_OMOGG_cbSeek(void *file, ogg_int64_t newpos, int set) 
{
	if(!gInStream->IsSeekable(gInStream)) return -1;
	if(set==SEEK_END)
		newpos=gInStream->GetLength(gInStream);
	gInStream->Seek(gInStream, (UINT)newpos);
	return (int)newpos;
}
int CPP_OMOGG_cbClose(void *file)
{
	gInStream->Uninitialise(gInStream);
	return 1;	
}
long CPP_OMOGG_cbTell(void *file)
{
	return gInStream->Tell(gInStream);
}
//
//
//
BOOL CPP_OMOGG_OpenFile(CPs_CoDecModule* pModule, const char* pcFilename, DWORD dwCookie, HWND hWndOwner)
{
    vorbis_info *pInfo = NULL;
	CPs_CoDec_Ogg *pContext = (CPs_CoDec_Ogg*)pModule->m_pModuleCookie;
	
	CP_CHECKOBJECT(pContext);
    // If we have a stream open - close it
    if(pContext->m_pInStream != NULL)
    {
        CP_TRACE0("Already had a stream open, closing it");
        ov_clear(&pContext->vf);
        pContext->m_pInStream = NULL;
    }
    // Open our new stream
    CP_TRACE1("Openfile "%s"", pcFilename);
    pContext->m_pInStream = CP_CreateInStream(pcFilename, hWndOwner);
    if(!pContext->m_pInStream)
    {
        CP_TRACE0("CPI_CoDec__OpenFile: failed");
        return FALSE;
    }
	gInStream = pContext->m_pInStream;
	/*   pContext->m_pInStream = fopen(pcFilename, "rb");
    if(pContext->m_pInStream == NULL)
    {
        CP_TRACE0("Failed to open file");
        return FALSE;	// Failure
    }
*/
  
    memset(&pContext->vf, 0, sizeof(pContext->vf));
	{
	ov_callbacks callbacks = {
    (size_t (*)(void *, size_t, size_t, void *)) CPP_OMOGG_cbRead,
    (int (*)(void *, ogg_int64_t, int))   CPP_OMOGG_cbSeek,
    (int (*)(void *))                  CPP_OMOGG_cbClose,
    (long (*)(void *))              CPP_OMOGG_cbTell
	  };
  if( ov_open_callbacks((void *)(gInStream), &pContext->vf, NULL, 0, callbacks) <0)
//    if(ov_open(pContext->m_pInStream, &pContext->vf, NULL, 0) < 0)
    {
        CP_TRACE0("Input does not appear to be an Ogg bitstream.");
        pContext->m_pInStream->Uninitialise(pContext->m_pInStream);
        pContext->m_pInStream = NULL;
        return FALSE;
    }
    if (ov_streams(&pContext->vf) != 1)
    {
        CP_TRACE1("Can't deal with multiple streams yet. Streams:%d", ov_streams(&pContext->vf));
        ov_clear(&pContext->vf);
        pContext->m_pInStream->Uninitialise(pContext->m_pInStream);
        pContext->m_pInStream = NULL;
        return FALSE;
    }
    pInfo = ov_info(&pContext->vf, -1);
    if (pInfo == NULL)
    {
        CP_TRACE0("Unable to get ogg info.");
        ov_clear(&pContext->vf);
        pContext->m_pInStream->Uninitialise(pContext->m_pInStream);
        pContext->m_pInStream = NULL;
        return FALSE;
    }
    if (pInfo->channels > 2)
    {
        CP_TRACE1("Can't deal with more than 2 channels yet. Channels:%d", pInfo->channels);
        ov_clear(&pContext->vf);
        pContext->m_pInStream->Uninitialise(pContext->m_pInStream);
        pContext->m_pInStream = NULL;
        return FALSE;
    }
    // Load m_FileInfo
    pContext->m_FileInfo.m_b16bit = TRUE; //?
    pContext->m_FileInfo.m_iBitRate_Kbs = ov_bitrate(&pContext->vf, -1) / 1000;
    pContext->m_FileInfo.m_iFileLength_Secs = (int)ov_time_total(&pContext->vf, -1);
    pContext->m_FileInfo.m_iFreq_Hz = pInfo->rate;
    pContext->m_FileInfo.m_bStereo = (pInfo->channels == 2);
	}
    return TRUE;	// Success
}
//
//
//
void CPP_OMOGG_CloseFile(CPs_CoDecModule* pModule)
{
    CPs_CoDec_Ogg *pContext = (CPs_CoDec_Ogg*)pModule->m_pModuleCookie;
    CP_CHECKOBJECT(pContext);
    // If we have a stream open - close it
    if(pContext->m_pInStream != NULL)
    {
        ov_clear(&pContext->vf);
        pContext->m_pInStream = NULL;
    }
}
//
//
//
void CPP_OMOGG_Seek(CPs_CoDecModule* pModule, const int iNumerator, const int iDenominator)
{
    CPs_CoDec_Ogg *pContext = (CPs_CoDec_Ogg*)pModule->m_pModuleCookie;
    CP_CHECKOBJECT(pContext);
    // No error handling. If there is an error, there will be no seek
    ov_pcm_seek(&pContext->vf, (ogg_int64_t) (((float)iNumerator/(float)iDenominator) * (float)ov_pcm_total(&pContext->vf, -1)));
}
//
//
//
BOOL CPP_OMOGG_GetPCMBlock(CPs_CoDecModule* pModule, void* pBlock, DWORD* pdwBlockSize)
{
    int ret;
    BOOL CONTINUE = TRUE;
    DWORD bytes_read = *pdwBlockSize;
    CPs_CoDec_Ogg *pContext = (CPs_CoDec_Ogg*)pModule->m_pModuleCookie;
    CP_CHECKOBJECT(pContext);
    // Read PCM data from decoder. Little endian (0), 16-Bit (2), Signed (1)
    bytes_read = 0;
    while (bytes_read < *pdwBlockSize)
    {
        ret = ov_read(&pContext->vf, (unsigned char *)pBlock + bytes_read, *pdwBlockSize - bytes_read, 0, 2, 1, &pContext->current_section);
        if (ret == 0)
        {
            *pdwBlockSize = bytes_read;
            CONTINUE = FALSE;
            break;
        } else if (ret < 0)
        {
            CP_TRACE0("Hole in OGG/VORBIS datastream, ignoring...");
        } else {
            bytes_read += ret;
        }
    }
    return CONTINUE;	//More data to come
}
//
//
//
void CPP_OMOGG_GetFileInfo(CPs_CoDecModule* pModule, CPs_FileInfo* pInfo)
{
    CPs_CoDec_Ogg *pContext = (CPs_CoDec_Ogg*)pModule->m_pModuleCookie;
    CP_CHECKOBJECT(pContext);
    memcpy(pInfo, &pContext->m_FileInfo, sizeof(*pInfo));
}
//
//
//
int CPP_OMOGG_GetCurrentPos_secs(CPs_CoDecModule* pModule)
{
    CPs_CoDec_Ogg *pContext = (CPs_CoDec_Ogg*)pModule->m_pModuleCookie;
    CP_CHECKOBJECT(pContext);
    return (int)ov_time_tell(&pContext->vf);;
}
//
//
//

						