mediatype.c

来自「linux下实现视频播放的播放器」· C语言 代码 · 共 104 行

/*
 *     AM_MEDIA_TYPE service functions implementations
 *     Code is based on quartz/enummedia.c file from wine project.
 *     Modified by Vladimir Voroshilov
 *
 *     Original code: Copyright 2003 Robert Shearman
 *
 *     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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 *
 */
#include "config.h"
#if (C_HAS_DIRECTSHOW)

#include "mediatype.h"
#include "wine/winerror.h"
#include "com.h"

#ifndef NOAVIFILE_HEADERS
#include "audiodecoder.h"
#include "except.h"
#else
#include "libwin32.h"
#endif


HRESULT CopyMediaType(AM_MEDIA_TYPE * pDest, const AM_MEDIA_TYPE *pSrc)
{
    if(!pSrc || !pDest) return E_POINTER;

    if(pSrc == pDest) return E_INVALIDARG;

    if(!pSrc->pbFormat && pSrc->cbFormat) return E_POINTER;

    memcpy(pDest, pSrc, sizeof(AM_MEDIA_TYPE));
    if (!pSrc->pbFormat) return S_OK;
    if (!(pDest->pbFormat = CoTaskMemAlloc(pSrc->cbFormat)))
        return E_OUTOFMEMORY;
    memcpy(pDest->pbFormat, pSrc->pbFormat, pSrc->cbFormat);
    if (pDest->pUnk)
        pDest->pUnk->vt->AddRef(pDest->pUnk);
    return S_OK;
}

void FreeMediaType(AM_MEDIA_TYPE * pMediaType)
{
    if (!pMediaType) return;
    if (pMediaType->pbFormat)
    {
        CoTaskMemFree(pMediaType->pbFormat);
        pMediaType->pbFormat = NULL;
    }
    if (pMediaType->pUnk)
    {
	LOG_MSG("FreeMediaType(%p): %p", pMediaType, pMediaType->pUnk);
        pMediaType->pUnk->vt->Release(pMediaType->pUnk);
        pMediaType->pUnk = NULL;
    }
}

AM_MEDIA_TYPE * CreateMediaType(AM_MEDIA_TYPE const * pSrc)
{
    AM_MEDIA_TYPE * pDest;
    if (!pSrc) return NULL;
    pDest = CoTaskMemAlloc(sizeof(AM_MEDIA_TYPE));
    if (!pDest)
        return NULL;

    if (FAILED(CopyMediaType(pDest, pSrc)))
    {
        CoTaskMemFree(pDest);
        return NULL;
    }

    return pDest;
}

void DeleteMediaType(AM_MEDIA_TYPE * pMediaType)
{
    if (!pMediaType) return;
    FreeMediaType(pMediaType);
    CoTaskMemFree(pMediaType);
}

#define IsEqualGUID(a,b) (memcmp(a,b,16)==0)
int CompareMediaTypes(const AM_MEDIA_TYPE * pmt1, const AM_MEDIA_TYPE * pmt2, int bWildcards)
{
    return (((bWildcards && (IsEqualGUID(&pmt1->majortype, &GUID_NULL) || IsEqualGUID(&pmt2->majortype, &GUID_NULL))) || IsEqualGUID(&pmt1->majortype, &pmt2->majortype)) &&
            ((bWildcards && (IsEqualGUID(&pmt1->subtype, &GUID_NULL)   || IsEqualGUID(&pmt2->subtype, &GUID_NULL)))   || IsEqualGUID(&pmt1->subtype, &pmt2->subtype)));
}

#endif // (C_HAS_DIRECTSHOW)