/*
 * Implementation of MedaType utility functions
 *
 * Copyright 2003 Robert Shearman
 * Copyright 2010 Aric Stewart, CodeWeavers
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */
#include <stdarg.h>

#define COBJMACROS
#include "dshow.h"

#include "wine/strmbase.h"
#include "wine/debug.h"

WINE_DEFAULT_DEBUG_CHANNEL(strmbase);

HRESULT WINAPI CopyMediaType(AM_MEDIA_TYPE *dest, const AM_MEDIA_TYPE *src)
{
    *dest = *src;
    if (src->pbFormat)
    {
        dest->pbFormat = CoTaskMemAlloc(src->cbFormat);
        if (!dest->pbFormat)
            return E_OUTOFMEMORY;
        memcpy(dest->pbFormat, src->pbFormat, src->cbFormat);
    }
    if (dest->pUnk)
        IUnknown_AddRef(dest->pUnk);
    return S_OK;
}

void WINAPI FreeMediaType(AM_MEDIA_TYPE * pMediaType)
{
    CoTaskMemFree(pMediaType->pbFormat);
    pMediaType->pbFormat = NULL;
    if (pMediaType->pUnk)
    {
        IUnknown_Release(pMediaType->pUnk);
        pMediaType->pUnk = NULL;
    }
}

AM_MEDIA_TYPE * WINAPI CreateMediaType(AM_MEDIA_TYPE const * pSrc)
{
    AM_MEDIA_TYPE * pDest;

    pDest = CoTaskMemAlloc(sizeof(AM_MEDIA_TYPE));
    if (!pDest)
        return NULL;

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

    return pDest;
}

void WINAPI DeleteMediaType(AM_MEDIA_TYPE * pMediaType)
{
    FreeMediaType(pMediaType);
    CoTaskMemFree(pMediaType);
}

typedef struct IEnumMediaTypesImpl
{
    IEnumMediaTypes IEnumMediaTypes_iface;
    LONG refCount;
    BasePin *basePin;
    ULONG count;
    ULONG uIndex;
} IEnumMediaTypesImpl;

static inline IEnumMediaTypesImpl *impl_from_IEnumMediaTypes(IEnumMediaTypes *iface)
{
    return CONTAINING_RECORD(iface, IEnumMediaTypesImpl, IEnumMediaTypes_iface);
}

static const struct IEnumMediaTypesVtbl IEnumMediaTypesImpl_Vtbl;

HRESULT enum_media_types_create(BasePin *basePin, IEnumMediaTypes **ppEnum)
{
    IEnumMediaTypesImpl * pEnumMediaTypes = CoTaskMemAlloc(sizeof(IEnumMediaTypesImpl));

    *ppEnum = NULL;

    if (!pEnumMediaTypes)
        return E_OUTOFMEMORY;

    pEnumMediaTypes->IEnumMediaTypes_iface.lpVtbl = &IEnumMediaTypesImpl_Vtbl;
    pEnumMediaTypes->refCount = 1;
    pEnumMediaTypes->uIndex = 0;
    IPin_AddRef(&basePin->IPin_iface);
    pEnumMediaTypes->basePin = basePin;

    IEnumMediaTypes_Reset(&pEnumMediaTypes->IEnumMediaTypes_iface);

    *ppEnum = &pEnumMediaTypes->IEnumMediaTypes_iface;
    return S_OK;
}

static HRESULT WINAPI IEnumMediaTypesImpl_QueryInterface(IEnumMediaTypes * iface, REFIID riid, void ** ret_iface)
{
    TRACE("(%p)->(%s, %p)\n", iface, debugstr_guid(riid), ret_iface);

    if (IsEqualIID(riid, &IID_IUnknown) ||
        IsEqualIID(riid, &IID_IEnumMediaTypes))
    {
        IEnumMediaTypes_AddRef(iface);
        *ret_iface = iface;
        return S_OK;
    }

    *ret_iface = NULL;

    WARN("No interface for %s\n", debugstr_guid(riid));

    return E_NOINTERFACE;
}

static ULONG WINAPI IEnumMediaTypesImpl_AddRef(IEnumMediaTypes * iface)
{
    IEnumMediaTypesImpl *This = impl_from_IEnumMediaTypes(iface);
    ULONG ref = InterlockedIncrement(&This->refCount);

    TRACE("(%p)->(): new ref = %u\n", iface, ref);

    return ref;
}

static ULONG WINAPI IEnumMediaTypesImpl_Release(IEnumMediaTypes * iface)
{
    IEnumMediaTypesImpl *This = impl_from_IEnumMediaTypes(iface);
    ULONG ref = InterlockedDecrement(&This->refCount);

    TRACE("(%p)->(): new ref = %u\n", iface, ref);

    if (!ref)
    {
        IPin_Release(&This->basePin->IPin_iface);
        CoTaskMemFree(This);
    }
    return ref;
}

static HRESULT WINAPI IEnumMediaTypesImpl_Next(IEnumMediaTypes *iface,
        ULONG count, AM_MEDIA_TYPE **mts, ULONG *ret_count)
{
    IEnumMediaTypesImpl *enummt = impl_from_IEnumMediaTypes(iface);
    ULONG i;

    TRACE("iface %p, count %u, mts %p, ret_count %p.\n", iface, count, mts, ret_count);

    for (i = 0; i < count && enummt->uIndex + i < enummt->count; i++)
    {
        if (!(mts[i] = CoTaskMemAlloc(sizeof(AM_MEDIA_TYPE)))
                || FAILED(enummt->basePin->pFuncsTable->pfnGetMediaType(enummt->basePin, enummt->uIndex + i, mts[i])))
        {
            while (i--)
                DeleteMediaType(mts[i]);
            *ret_count = 0;
            return E_OUTOFMEMORY;
        }
    }

    if ((count != 1) || ret_count)
        *ret_count = i;

    enummt->uIndex += i;

    return i == count ? S_OK : S_FALSE;
}

static HRESULT WINAPI IEnumMediaTypesImpl_Skip(IEnumMediaTypes *iface, ULONG count)
{
    IEnumMediaTypesImpl *enummt = impl_from_IEnumMediaTypes(iface);

    TRACE("iface %p, count %u.\n", iface, count);

    enummt->uIndex += count;

    return enummt->uIndex > enummt->count ? S_FALSE : S_OK;
}

static HRESULT WINAPI IEnumMediaTypesImpl_Reset(IEnumMediaTypes * iface)
{
    ULONG i;
    AM_MEDIA_TYPE amt;
    IEnumMediaTypesImpl *This = impl_from_IEnumMediaTypes(iface);

    TRACE("(%p)->()\n", iface);

    i = 0;
    while (This->basePin->pFuncsTable->pfnGetMediaType(This->basePin, i, &amt) == S_OK)
    {
        FreeMediaType(&amt);
        i++;
    }
    This->count = i;
    This->uIndex = 0;

    return S_OK;
}

static HRESULT WINAPI IEnumMediaTypesImpl_Clone(IEnumMediaTypes * iface, IEnumMediaTypes ** ppEnum)
{
    HRESULT hr;
    IEnumMediaTypesImpl *This = impl_from_IEnumMediaTypes(iface);

    TRACE("(%p)->(%p)\n", iface, ppEnum);

    hr = enum_media_types_create(This->basePin, ppEnum);
    if (FAILED(hr))
        return hr;
    return IEnumMediaTypes_Skip(*ppEnum, This->uIndex);
}

static const IEnumMediaTypesVtbl IEnumMediaTypesImpl_Vtbl =
{
    IEnumMediaTypesImpl_QueryInterface,
    IEnumMediaTypesImpl_AddRef,
    IEnumMediaTypesImpl_Release,
    IEnumMediaTypesImpl_Next,
    IEnumMediaTypesImpl_Skip,
    IEnumMediaTypesImpl_Reset,
    IEnumMediaTypesImpl_Clone
};