/*
 * ACM Wrapper
 *
 * Copyright 2005 Christian Costa
 *
 * 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 "quartz_private.h"

#include "uuids.h"
#include "mmreg.h"
#include "windef.h"
#include "winbase.h"
#include "dshow.h"
#include "strmif.h"
#include "vfwmsgs.h"
#include "msacm.h"

#include <assert.h>

#include "wine/debug.h"

WINE_DEFAULT_DEBUG_CHANNEL(quartz);

typedef struct ACMWrapperImpl
{
    TransformFilter tf;

    HACMSTREAM has;
    LPWAVEFORMATEX pWfOut;

    LONGLONG lasttime_real;
    LONGLONG lasttime_sent;
} ACMWrapperImpl;

static inline ACMWrapperImpl *impl_from_TransformFilter( TransformFilter *iface )
{
    return CONTAINING_RECORD(iface, ACMWrapperImpl, tf);
}

static HRESULT WINAPI ACMWrapper_Receive(TransformFilter *tf, IMediaSample *pSample)
{
    ACMWrapperImpl* This = impl_from_TransformFilter(tf);
    IMediaSample* pOutSample = NULL;
    DWORD cbDstStream, cbSrcStream;
    LPBYTE pbDstStream;
    LPBYTE pbSrcStream = NULL;
    ACMSTREAMHEADER ash;
    BOOL unprepare_header = FALSE, preroll;
    MMRESULT res;
    HRESULT hr;
    LONGLONG tStart = -1, tStop = -1, tMed;
    LONGLONG mtStart = -1, mtStop = -1, mtMed;

    hr = IMediaSample_GetPointer(pSample, &pbSrcStream);
    if (FAILED(hr))
    {
        ERR("Cannot get pointer to sample data (%x)\n", hr);
        return hr;
    }

    preroll = (IMediaSample_IsPreroll(pSample) == S_OK);

    IMediaSample_GetTime(pSample, &tStart, &tStop);
    if (IMediaSample_GetMediaTime(pSample, &mtStart, &mtStop) != S_OK)
        mtStart = mtStop = -1;
    cbSrcStream = IMediaSample_GetActualDataLength(pSample);

    /* Prevent discontinuities when codecs 'absorb' data but not give anything back in return */
    if (IMediaSample_IsDiscontinuity(pSample) == S_OK)
    {
        This->lasttime_real = tStart;
        This->lasttime_sent = tStart;
    }
    else if (This->lasttime_real == tStart)
        tStart = This->lasttime_sent;
    else
        WARN("Discontinuity\n");

    tMed = tStart;
    mtMed = mtStart;

    TRACE("Sample data ptr = %p, size = %d\n", pbSrcStream, cbSrcStream);

    ash.pbSrc = pbSrcStream;
    ash.cbSrcLength = cbSrcStream;

    while(hr == S_OK && ash.cbSrcLength)
    {
        hr = BaseOutputPinImpl_GetDeliveryBuffer(&This->tf.source, &pOutSample, NULL, NULL, 0);
        if (FAILED(hr))
        {
            ERR("Unable to get delivery buffer (%x)\n", hr);
            return hr;
        }
        IMediaSample_SetPreroll(pOutSample, preroll);

	hr = IMediaSample_SetActualDataLength(pOutSample, 0);
	assert(hr == S_OK);

	hr = IMediaSample_GetPointer(pOutSample, &pbDstStream);
	if (FAILED(hr)) {
	    ERR("Unable to get pointer to buffer (%x)\n", hr);
	    goto error;
	}
	cbDstStream = IMediaSample_GetSize(pOutSample);

	ash.cbStruct = sizeof(ash);
	ash.fdwStatus = 0;
	ash.dwUser = 0;
	ash.pbDst = pbDstStream;
	ash.cbDstLength = cbDstStream;

	if ((res = acmStreamPrepareHeader(This->has, &ash, 0))) {
	    ERR("Cannot prepare header %d\n", res);
	    goto error;
	}
	unprepare_header = TRUE;

        if (IMediaSample_IsDiscontinuity(pSample) == S_OK)
        {
            res = acmStreamConvert(This->has, &ash, ACM_STREAMCONVERTF_START);
            IMediaSample_SetDiscontinuity(pOutSample, TRUE);
            /* One sample could be converted to multiple packets */
            IMediaSample_SetDiscontinuity(pSample, FALSE);
        }
        else
        {
            res = acmStreamConvert(This->has, &ash, 0);
            IMediaSample_SetDiscontinuity(pOutSample, FALSE);
        }

        if (res)
        {
            if(res != MMSYSERR_MOREDATA)
                ERR("Cannot convert data header %d\n", res);
            goto error;
        }

        TRACE("used in %u/%u, used out %u/%u\n", ash.cbSrcLengthUsed, ash.cbSrcLength, ash.cbDstLengthUsed, ash.cbDstLength);

        hr = IMediaSample_SetActualDataLength(pOutSample, ash.cbDstLengthUsed);
        assert(hr == S_OK);

        /* Bug in acm codecs? It apparently uses the input, but doesn't necessarily output immediately */
        if (!ash.cbSrcLengthUsed)
        {
            WARN("Sample was skipped? Outputted: %u\n", ash.cbDstLengthUsed);
            ash.cbSrcLength = 0;
            goto error;
        }

        TRACE("Sample start time: %s.\n", debugstr_time(tStart));
        if (ash.cbSrcLengthUsed == cbSrcStream)
        {
            IMediaSample_SetTime(pOutSample, &tStart, &tStop);
            tStart = tMed = tStop;
        }
        else if (tStop != tStart)
        {
            tMed = tStop - tStart;
            tMed = tStart + tMed * ash.cbSrcLengthUsed / cbSrcStream;
            IMediaSample_SetTime(pOutSample, &tStart, &tMed);
            tStart = tMed;
        }
        else
        {
            ERR("No valid timestamp found\n");
            IMediaSample_SetTime(pOutSample, NULL, NULL);
        }

        if (mtStart < 0) {
            IMediaSample_SetMediaTime(pOutSample, NULL, NULL);
        } else if (ash.cbSrcLengthUsed == cbSrcStream) {
            IMediaSample_SetMediaTime(pOutSample, &mtStart, &mtStop);
            mtStart = mtMed = mtStop;
        } else if (mtStop >= mtStart) {
            mtMed = mtStop - mtStart;
            mtMed = mtStart + mtMed * ash.cbSrcLengthUsed / cbSrcStream;
            IMediaSample_SetMediaTime(pOutSample, &mtStart, &mtMed);
            mtStart = mtMed;
        } else {
            IMediaSample_SetMediaTime(pOutSample, NULL, NULL);
        }

        TRACE("Sample stop time: %s\n", debugstr_time(tStart));

        hr = IMemInputPin_Receive(This->tf.source.pMemInputPin, pOutSample);
        if (hr != S_OK && hr != VFW_E_NOT_CONNECTED) {
            if (FAILED(hr))
                ERR("Error sending sample (%x)\n", hr);
            goto error;
        }

error:
        if (unprepare_header && (res = acmStreamUnprepareHeader(This->has, &ash, 0)))
            ERR("Cannot unprepare header %d\n", res);
        unprepare_header = FALSE;
        ash.pbSrc += ash.cbSrcLengthUsed;
        ash.cbSrcLength -= ash.cbSrcLengthUsed;

        IMediaSample_Release(pOutSample);
        pOutSample = NULL;

    }

    This->lasttime_real = tStop;
    This->lasttime_sent = tMed;

    return hr;
}

static BOOL is_audio_subtype(const GUID *guid)
{
    return !memcmp(&guid->Data2, &MEDIATYPE_Audio.Data2, sizeof(GUID) - sizeof(int));
}

static HRESULT acm_wrapper_connect_sink(TransformFilter *iface, const AM_MEDIA_TYPE *mt)
{
    ACMWrapperImpl *filter = impl_from_TransformFilter(iface);
    const WAVEFORMATEX *wfx = (WAVEFORMATEX *)mt->pbFormat;
    HACMSTREAM drv;
    MMRESULT res;

    if (!IsEqualGUID(&mt->majortype, &MEDIATYPE_Audio) || !is_audio_subtype(&mt->subtype)
            || !IsEqualGUID(&mt->formattype, &FORMAT_WaveFormatEx) || !wfx
            || wfx->wFormatTag == WAVE_FORMAT_PCM || wfx->wFormatTag == WAVE_FORMAT_EXTENSIBLE)
        return VFW_E_TYPE_NOT_ACCEPTED;

    CopyMediaType(&filter->tf.pmt, mt);
    filter->tf.pmt.subtype.Data1 = WAVE_FORMAT_PCM;
    filter->pWfOut = (WAVEFORMATEX *)filter->tf.pmt.pbFormat;
    filter->pWfOut->wFormatTag = WAVE_FORMAT_PCM;
    filter->pWfOut->wBitsPerSample = 16;
    filter->pWfOut->nBlockAlign = filter->pWfOut->wBitsPerSample * filter->pWfOut->nChannels / 8;
    filter->pWfOut->cbSize = 0;
    filter->pWfOut->nAvgBytesPerSec = filter->pWfOut->nChannels * filter->pWfOut->nSamplesPerSec
            * (filter->pWfOut->wBitsPerSample / 8);

    if ((res = acmStreamOpen(&drv, NULL, (WAVEFORMATEX *)wfx, filter->pWfOut, NULL, 0, 0, 0)))
    {
        ERR("Failed to open stream, error %u.\n", res);
        FreeMediaType(&filter->tf.pmt);
        return VFW_E_TYPE_NOT_ACCEPTED;
    }

    filter->has = drv;

    return S_OK;
}

static HRESULT WINAPI ACMWrapper_BreakConnect(TransformFilter *tf, PIN_DIRECTION dir)
{
    ACMWrapperImpl *This = impl_from_TransformFilter(tf);

    TRACE("(%p)->(%i)\n", This,dir);

    if (dir == PINDIR_INPUT)
    {
        if (This->has)
            acmStreamClose(This->has, 0);

        This->has = 0;
        This->lasttime_real = This->lasttime_sent = -1;
    }

    return S_OK;
}

static HRESULT WINAPI ACMWrapper_DecideBufferSize(TransformFilter *tf, IMemAllocator *pAlloc, ALLOCATOR_PROPERTIES *ppropInputRequest)
{
    ACMWrapperImpl *pACM = impl_from_TransformFilter(tf);
    ALLOCATOR_PROPERTIES actual;

    if (!ppropInputRequest->cbAlign)
        ppropInputRequest->cbAlign = 1;

    if (ppropInputRequest->cbBuffer < pACM->pWfOut->nAvgBytesPerSec / 2)
            ppropInputRequest->cbBuffer = pACM->pWfOut->nAvgBytesPerSec / 2;

    if (!ppropInputRequest->cBuffers)
        ppropInputRequest->cBuffers = 1;

    return IMemAllocator_SetProperties(pAlloc, ppropInputRequest, &actual);
}

static const TransformFilterFuncTable ACMWrapper_FuncsTable = {
    .pfnDecideBufferSize = ACMWrapper_DecideBufferSize,
    .pfnReceive = ACMWrapper_Receive,
    .transform_connect_sink = acm_wrapper_connect_sink,
    .pfnBreakConnect = ACMWrapper_BreakConnect,
};

HRESULT ACMWrapper_create(IUnknown *outer, void **out)
{
    HRESULT hr;
    ACMWrapperImpl* This;

    *out = NULL;

    hr = strmbase_transform_create(sizeof(ACMWrapperImpl), outer, &CLSID_ACMWrapper,
            &ACMWrapper_FuncsTable, (IBaseFilter **)&This);

    if (FAILED(hr))
        return hr;

    *out = &This->tf.filter.IUnknown_inner;
    This->lasttime_real = This->lasttime_sent = -1;

    return hr;
}