cpi_playlistitem.c

VC++视频开发实例集锦(包括“远程视频监控”"语音识别系统"等13个经典例子)

////////////////////////////////////////////////////////////////////////////////



#include "stdafx.h"
#include "globals.h"
#include "CPI_Playlist.h"
#include "CPI_PlaylistItem.h"
#include "CPI_PlaylistItem_Internal.h"
#include "CPI_ID3.h"





void CPLI_OGG_SkipOverTab(FILE* pFile);
void CPLI_SetPath(CPs_PlaylistItem* pItem, const char* pcNewPath);
void CPLI_ReadTag_ID3v1(CPs_PlaylistItem* pItem, HANDLE hFile);
void CPLI_ReadTag_ID3v2(CPs_PlaylistItem* pItem, HANDLE hFile);
//void CPLI_ReadTag_OGG(CPs_PlaylistItem* pItem);
void CPLI_WriteTag_ID3v1(CPs_PlaylistItem* pItem, HANDLE hFile);
void CPLI_WriteTag_ID3v2(CPs_PlaylistItem* pItem, HANDLE hFile);
//void CPLI_WriteTag_OGG(CPs_PlaylistItem* pItem, HANDLE hFile);
//void CPLI_CalculateLength_OGG(CPs_PlaylistItem* pItem);
void CPLI_CalculateLength_MP3(CPs_PlaylistItem* pItem);
void CPLI_ShrinkFile(HANDLE hFile, const DWORD dwStartOffset, const unsigned int iNumBytes);
BOOL CPLI_GrowFile(HANDLE hFile, const DWORD dwStartOffset, const unsigned int iNumBytes);
////////////////////////////////////////////////////////////////////////////////
//
//
//
CP_HPLAYLISTITEM CPLII_CreateItem(const char* pcPath)
{
    CPs_PlaylistItem* pNewItem = (CPs_PlaylistItem*)malloc(sizeof(CPs_PlaylistItem));

    pNewItem->m_pcPath = NULL;
    CPLI_SetPath(pNewItem, pcPath);

    pNewItem->m_cTrackStackPos_AsText[0] = '\0';
    pNewItem->m_iTrackStackPos = CIC_TRACKSTACK_UNSTACKED;
    pNewItem->m_enTagType = ttUnread;
    pNewItem->m_bID3Tag_SaveRequired = FALSE;
    pNewItem->m_bDestroyOnDeactivate = FALSE;
    pNewItem->m_pcArtist = NULL;
    pNewItem->m_pcAlbum = NULL;
    pNewItem->m_pcTrackName = NULL;
    pNewItem->m_pcComment = NULL;
    pNewItem->m_pcYear = NULL;
    pNewItem->m_cGenre = CIC_INVALIDGENRE;
    pNewItem->m_cTrackNum = CIC_INVALIDTRACKNUM;
    pNewItem->m_pcTrackNum_AsText = NULL;
    pNewItem->m_iTrackLength = 0;
    pNewItem->m_pcTrackLength_AsText = NULL;

    pNewItem->m_iCookie = -1;

    pNewItem->m_hNext = NULL;
    pNewItem->m_hPrev = NULL;

    return pNewItem;
}
//
//
//
void CPLII_RemoveTagInfo(CPs_PlaylistItem* pItem)
{
    if(pItem->m_pcArtist)
    {
        free(pItem->m_pcArtist);
        pItem->m_pcArtist = NULL;
    }
    if(pItem->m_pcAlbum)
    {
        free(pItem->m_pcAlbum);
        pItem->m_pcAlbum = NULL;
    }
    if(pItem->m_pcTrackName)
    {
        free(pItem->m_pcTrackName);
        pItem->m_pcTrackName = NULL;
    }
    if(pItem->m_pcComment)
    {
        free(pItem->m_pcComment);
        pItem->m_pcComment = NULL;
    }
    if(pItem->m_pcYear)
    {
        free(pItem->m_pcYear);
        pItem->m_pcYear = NULL;
    }
    if(pItem->m_pcTrackNum_AsText)
    {
        free(pItem->m_pcTrackNum_AsText);
        pItem->m_pcTrackNum_AsText = NULL;
    }
    if(pItem->m_pcTrackLength_AsText)
    {
        free(pItem->m_pcTrackLength_AsText);
        pItem->m_pcTrackLength_AsText = NULL;
    }
    pItem->m_cGenre = CIC_INVALIDGENRE;
    pItem->m_iTrackLength = 0;
    pItem->m_cTrackNum = CIC_INVALIDTRACKNUM;
    pItem->m_enTagType = ttUnread;
    pItem->m_bID3Tag_SaveRequired = FALSE;
}
//
//
//
void CPLII_DestroyItem(CP_HPLAYLISTITEM hItem)
{
    CPs_PlaylistItem* pItem = (CPs_PlaylistItem*)hItem;
    CP_CHECKOBJECT(pItem);

    CPLII_RemoveTagInfo(pItem);
    free(pItem->m_pcPath);
    free(pItem);
}
//
//
//
const char* CPLI_GetPath(const CP_HPLAYLISTITEM hItem)
{
    CPs_PlaylistItem* pItem = (CPs_PlaylistItem*)hItem;
    CP_CHECKOBJECT(pItem);

    return pItem->m_pcPath;
}
//
//
//
const char* CPLI_GetFilename(const CP_HPLAYLISTITEM hItem)
{
    CPs_PlaylistItem* pItem = (CPs_PlaylistItem*)hItem;
    CP_CHECKOBJECT(pItem);

    return pItem->m_pcFilename;
}
//
//
//
int CPLI_GetTrackStackPos(const CP_HPLAYLISTITEM hItem)
{
    CPs_PlaylistItem* pItem = (CPs_PlaylistItem*)hItem;
    CP_CHECKOBJECT(pItem);

    return pItem->m_iTrackStackPos;
}
//
//
//
const char* CPLI_GetTrackStackPos_AsText(const CP_HPLAYLISTITEM hItem)
{
    CPs_PlaylistItem* pItem = (CPs_PlaylistItem*)hItem;
    CP_CHECKOBJECT(pItem);

    return pItem->m_cTrackStackPos_AsText;
}
//
//
//
const char* CPLI_GetArtist(const CP_HPLAYLISTITEM hItem)
{
    CPs_PlaylistItem* pItem = (CPs_PlaylistItem*)hItem;
    CP_CHECKOBJECT(pItem);

    return pItem->m_pcArtist;
}
//
//
//
const char* CPLI_GetAlbum(const CP_HPLAYLISTITEM hItem)
{
    CPs_PlaylistItem* pItem = (CPs_PlaylistItem*)hItem;
    CP_CHECKOBJECT(pItem);

    return pItem->m_pcAlbum;
}
//
//
//
const char* CPLI_GetTrackName(const CP_HPLAYLISTITEM hItem)
{
    CPs_PlaylistItem* pItem = (CPs_PlaylistItem*)hItem;
    CP_CHECKOBJECT(pItem);

    return pItem->m_pcTrackName;
}
//
//
//
const char* CPLI_GetComment(const CP_HPLAYLISTITEM hItem)
{
    CPs_PlaylistItem* pItem = (CPs_PlaylistItem*)hItem;
    CP_CHECKOBJECT(pItem);

    return pItem->m_pcComment;
}
//
//
//
const char* CPLI_GetYear(const CP_HPLAYLISTITEM hItem)
{
    CPs_PlaylistItem* pItem = (CPs_PlaylistItem*)hItem;
    CP_CHECKOBJECT(pItem);

    return pItem->m_pcYear;
}
//
//
//
const char* CPLI_GetGenre(const CP_HPLAYLISTITEM hItem)
{
    CPs_PlaylistItem* pItem = (CPs_PlaylistItem*)hItem;
    CP_CHECKOBJECT(pItem);

    if(pItem->m_cGenre == CIC_INVALIDGENRE)
        return NULL;

    return glb_pcGenres[pItem->m_cGenre];
}
//
//
//
const unsigned char CPLI_GetTrackNum(const CP_HPLAYLISTITEM hItem)
{
    CPs_PlaylistItem* pItem = (CPs_PlaylistItem*)hItem;
    CP_CHECKOBJECT(pItem);

    return pItem->m_cTrackNum;
}
//
//
//
const char* CPLI_GetTrackNum_AsText(const CP_HPLAYLISTITEM hItem)
{
    CPs_PlaylistItem* pItem = (CPs_PlaylistItem*)hItem;
    CP_CHECKOBJECT(pItem);

    return pItem->m_pcTrackNum_AsText;
}
//
//
//
const char* CPLI_GetTrackLength_AsText(const CP_HPLAYLISTITEM hItem)
{
    CPs_PlaylistItem* pItem = (CPs_PlaylistItem*)hItem;
    CP_CHECKOBJECT(pItem);

    return pItem->m_pcTrackLength_AsText;
}
//
//
//
int CPLI_GetTrackLength(const CP_HPLAYLISTITEM hItem)
{
    CPs_PlaylistItem* pItem = (CPs_PlaylistItem*)hItem;
    CP_CHECKOBJECT(pItem);

    return pItem->m_iTrackLength;
}
//
//
//
void CPLI_SetCookie(CP_HPLAYLISTITEM hItem, const int iCookie)
{
    CPs_PlaylistItem* pItem = (CPs_PlaylistItem*)hItem;
    CP_CHECKOBJECT(pItem);

    pItem->m_iCookie = iCookie;
}
//
//
//
int CPLI_GetCookie(const CP_HPLAYLISTITEM hItem)
{
    CPs_PlaylistItem* pItem = (CPs_PlaylistItem*)hItem;
    CP_CHECKOBJECT(pItem);

    return pItem->m_iCookie;
}
//
//
//
CP_HPLAYLISTITEM CPLI_Next(const CP_HPLAYLISTITEM hItem)
{
    CPs_PlaylistItem* pItem = (CPs_PlaylistItem*)hItem;
    CP_CHECKOBJECT(pItem);

    return pItem->m_hNext;
}
//
//
//
CP_HPLAYLISTITEM CPLI_Prev(const CP_HPLAYLISTITEM hItem)
{
    CPs_PlaylistItem* pItem = (CPs_PlaylistItem*)hItem;
    CP_CHECKOBJECT(pItem);

    return pItem->m_hPrev;
}
//
//
//
char* DecodeID3String(const char* pcSource, const int iLength)
{
    char* cWorkString = (char*)_alloca(iLength+1);
    char* pDestString;
    char* pcLastWhiteSpace;
    int iCharIDX;

    cWorkString[iLength] = '\0';
    memcpy(cWorkString, pcSource, iLength);

    // Remove trailing whitespace
    pcLastWhiteSpace = NULL;
    for(iCharIDX = 0; cWorkString[iCharIDX]; iCharIDX++)
    {
        if(cWorkString[iCharIDX] == ' ')
        {
            if(!pcLastWhiteSpace)
                pcLastWhiteSpace = cWorkString + iCharIDX;
        }
        else
            pcLastWhiteSpace = NULL;
    }
    if(pcLastWhiteSpace)
        *pcLastWhiteSpace = '\0';

    // Copy string
    STR_AllocSetString(&pDestString, cWorkString, FALSE);
    return pDestString;
}
//
//
//
void CPLI_ReadTag(CP_HPLAYLISTITEM hItem)
{
    CPs_PlaylistItem* pItem = (CPs_PlaylistItem*)hItem;
    HANDLE hFile;

    CP_CHECKOBJECT(pItem);
    if(pItem->m_enTagType != ttUnread)
        return;

    // - Try to open the file
    hFile = CreateFile(pItem->m_pcPath, GENERIC_READ,
                       FILE_SHARE_READ | FILE_SHARE_WRITE, 0,
                       OPEN_EXISTING, 0, 0);

    // Cannot open - fail silently
    if(hFile == INVALID_HANDLE_VALUE)
        return;

    // Try to read a V2 tag
    if(options.support_id3v2)
        CPLI_ReadTag_ID3v2(pItem, hFile);

    // Failed? - try a V1 tag instead
    if(pItem->m_enTagType == ttUnread)
        CPLI_ReadTag_ID3v1(pItem, hFile);

    CloseHandle(hFile);


    // Update interface
    CPL_cb_OnItemUpdated(hItem);
}
//
//
//
char* CPLI_ID3v2_DecodeString(const BYTE* pSourceText, const int iTagDataSize)
{
    int iStringLength;
    char* pcDestString;

    if(pSourceText[0] == '\0')
    {
        iStringLength = iTagDataSize-1;
        pcDestString = malloc(iStringLength+1);
        memcpy(pcDestString, pSourceText+1, iStringLength);
        pcDestString[iStringLength] = 0;
    }
    else
    {
        CP_TRACE0("ID3v2 Unknown encoding");
        pcDestString = NULL;
    }

    return pcDestString;
}
//
//
//
void CPLI_DecodeLength(CPs_PlaylistItem* pItem, unsigned int iNewLength)
{
    int iHours, iMins, iSecs;

    // Free existing buffer
    if(pItem->m_pcTrackLength_AsText)
    {
        free(pItem->m_pcTrackLength_AsText);
        pItem->m_pcTrackLength_AsText = NULL;
    }

    pItem->m_iTrackLength = iNewLength;
    iHours = iNewLength/3600;
    iMins = (iNewLength-(iHours*3600)) / 60;
    iSecs = iNewLength - (iHours*3600) - (iMins*60);

    // If length has hours then format as hh:mm:ss otherwise format as mm:ss
    if(iHours > 0)
    {
        pItem->m_pcTrackLength_AsText = (char*)malloc(9);
        sprintf(pItem->m_pcTrackLength_AsText, "%02d:%02d:%02d", iHours, iMins, iSecs);
    }
    else
    {
        pItem->m_pcTrackLength_AsText = (char*)malloc(6);
        sprintf(pItem->m_pcTrackLength_AsText, "%02d:%02d", iMins, iSecs);
    }
}
//
//
//
void CPLI_ReadTag_ID3v2(CPs_PlaylistItem* pItem, HANDLE hFile)
{
    DWORD dwBytesRead;
    int iTagDataToRead;
    CIs_ID3v2Tag ID3v2;

    SetFilePointer(hFile, 0, NULL, FILE_BEGIN);
    ReadFile(hFile, &ID3v2, sizeof(ID3v2), &dwBytesRead, NULL);

    // Not enough file data returned - or the data returned does not look like an ID3
    if(dwBytesRead != sizeof(ID3v2)
            || memcmp(ID3v2.m_cTAG, "ID3", 3) != 0
            || (ID3v2.m_cVersion[0] != 0x03 && ID3v2.m_cVersion[0] != 0x04))	// Major version wrong
    {
        return;
    }

    // Work out the amount of tag left to read
    iTagDataToRead = (ID3v2.m_cSize_Encoded[0] << 21)
                     | (ID3v2.m_cSize_Encoded[1] << 14)
                     | (ID3v2.m_cSize_Encoded[2] << 7)
                     | ID3v2.m_cSize_Encoded[3];

    // Check for a big enough file now (to save endless checking)
    if(GetFileSize(hFile, NULL) < (sizeof(ID3v2) + iTagDataToRead))
        return;

    // Skip over extended header (if there is one)
    if(ID3v2.m_cFlags & ID3v2_FLAG_EXTENDEDHEADER)
    {
        char cExtendedHeaderSize_Encoded[4];
        int iExtendedHeaderSize;

        ReadFile(hFile, cExtendedHeaderSize_Encoded, sizeof(cExtendedHeaderSize_Encoded), &dwBytesRead, NULL);

        iExtendedHeaderSize = (cExtendedHeaderSize_Encoded[0] << 21)
                              | (cExtendedHeaderSize_Encoded[1] << 14)
                              | (cExtendedHeaderSize_Encoded[2] << 7)
                              | cExtendedHeaderSize_Encoded[3];

        SetFilePointer(hFile, iExtendedHeaderSize - sizeof(cExtendedHeaderSize_Encoded), NULL, FILE_CURRENT);
        iTagDataToRead -= iExtendedHeaderSize;
    }

    while(iTagDataToRead > sizeof(CIs_ID3v2Frame))
    {
        CIs_ID3v2Frame ID3v2Frame;
        BYTE* pFrameData;
        int iFrameSize;

        ReadFile(hFile, &ID3v2Frame, sizeof(ID3v2Frame), &dwBytesRead, NULL);

        // Have we encountered padding?
        if(ID3v2Frame.m_cFrameID[0] == '\0')
            break;

        if(ID3v2.m_cVersion[0] == 0x03)
        {
            iFrameSize = (ID3v2Frame.m_cSize_Encoded[0] << 24)
                         | (ID3v2Frame.m_cSize_Encoded[1] << 16)
                         | (ID3v2Frame.m_cSize_Encoded[2] << 8)
                         | ID3v2Frame.m_cSize_Encoded[3];
        }
        else
        {
            iFrameSize = (ID3v2Frame.m_cSize_Encoded[0] << 21)
                         | (ID3v2Frame.m_cSize_Encoded[1] << 14)
                         | (ID3v2Frame.m_cSize_Encoded[2] << 7)
                         | ID3v2Frame.m_cSize_Encoded[3];
        }

        // Frame size invalid?