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pin.h

/*
 * IPin function declarations to allow inheritance
 *
 * Copyright 2003 Robert Shearman
 *
 * 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
 */

/* This function will process incoming samples to the pin.
 * Any return value valid in IMemInputPin::Receive is allowed here
 *
 * Cookie is the cookie that was set when requesting the buffer, if you don't
 * implement custom requesting, you can safely ignore this
 */
typedef HRESULT (* SAMPLEPROC_PUSH)(LPVOID userdata, IMediaSample * pSample);
typedef HRESULT (* SAMPLEPROC_PULL)(LPVOID userdata, IMediaSample * pSample, DWORD_PTR cookie);

/* This function will determine whether a type is supported or not.
 * It is allowed to return any error value (within reason), as opposed
 * to IPin::QueryAccept which is only allowed to return S_OK or S_FALSE.
 */
typedef HRESULT (* QUERYACCEPTPROC)(LPVOID userdata, const AM_MEDIA_TYPE * pmt);

/* This function is called prior to finalizing a connection with
 * another pin and can be used to get things from the other pin
 * like IMemInput interfaces.
 *
 * props contains some defaults, but you can safely override them to your liking
 */
typedef HRESULT (* PRECONNECTPROC)(IPin * iface, IPin * pConnectPin, ALLOCATOR_PROPERTIES *props);

/* This function is called whenever a cleanup operation has to occur,
 * this is usually after a flush, seek, or end of stream notification.
 * This code may even be repeated multiple times, so build your code to
 * tolerate this behavior. Return value is ignored and should be S_OK.
 */
typedef HRESULT (* CLEANUPPROC) (LPVOID userdata);

/* This function is called whenever a request for a new sample is made,
 * If you implement it (it can be NULL for default behavior), you have to
 * call IMemAllocator_GetBuffer and IMemAllocator_RequestBuffer
 * This is useful if you want to request more than 1 buffer at simultaneously
 *
 * This will also cause the Sample Proc to be called with empty buffers to indicate
 * failure in retrieving the sample.
 */
typedef HRESULT (* REQUESTPROC) (LPVOID userdata);

/* This function is called after processing is done (for whatever reason that is caused)
 * This is useful if you create processing threads that need to die
 */
typedef HRESULT (* STOPPROCESSPROC) (LPVOID userdata);

#define ALIGNDOWN(value,boundary) ((value)/(boundary)*(boundary))
#define ALIGNUP(value,boundary) (ALIGNDOWN((value)+(boundary)-1, (boundary)))

typedef struct IPinImpl
{
      const struct IPinVtbl * lpVtbl;
      LONG refCount;
      LPCRITICAL_SECTION pCritSec;
      PIN_INFO pinInfo;
      IPin * pConnectedTo;
      AM_MEDIA_TYPE mtCurrent;
      ENUMMEDIADETAILS enumMediaDetails;
      QUERYACCEPTPROC fnQueryAccept;
      LPVOID pUserData;
} IPinImpl;

typedef struct InputPin
{
      /* inheritance C style! */
      IPinImpl pin;

      const IMemInputPinVtbl * lpVtblMemInput;
      IMemAllocator * pAllocator;
      SAMPLEPROC_PUSH fnSampleProc;
      CLEANUPPROC fnCleanProc;
      REFERENCE_TIME tStart;
      REFERENCE_TIME tStop;
      double dRate;
      BOOL flushing, end_of_stream;
      IMemAllocator *preferred_allocator;
} InputPin;

typedef struct OutputPin
{
      /* inheritance C style! */
      IPinImpl pin;

      IMemInputPin * pMemInputPin;
      HRESULT (* pConnectSpecific)(IPin * iface, IPin * pReceiver, const AM_MEDIA_TYPE * pmt);
      BOOL custom_allocator;
      IMemAllocator *alloc;
      BOOL readonly;
      ALLOCATOR_PROPERTIES allocProps;
} OutputPin;

typedef struct PullPin
{
      /* inheritance C style! */
      IPinImpl pin;

      REFERENCE_TIME rtStart, rtCurrent, rtNext, rtStop;
      IAsyncReader * pReader;
      IMemAllocator * pAlloc;
      SAMPLEPROC_PULL fnSampleProc;
      PRECONNECTPROC fnPreConnect;
      REQUESTPROC fnCustomRequest;
      CLEANUPPROC fnCleanProc;
      STOPPROCESSPROC fnDone;
      double dRate;
      BOOL stop_playback;
      DWORD cbAlign;

      /* Any code that touches the thread must hold the thread lock,
       * lock order: thread_lock and then the filter critical section
       * also signal thread_sleepy so the thread knows to wake up
       */
      CRITICAL_SECTION thread_lock;
      HANDLE hThread;
      DWORD requested_state;
      HANDLE hEventStateChanged, thread_sleepy;
      DWORD state;
} PullPin;

#define Req_Sleepy 0
#define Req_Die    1
#define Req_Run    2
#define Req_Pause  3

/*** Constructors ***/
HRESULT InputPin_Construct(const IPinVtbl *InputPin_Vtbl, const PIN_INFO * pPinInfo, SAMPLEPROC_PUSH pSampleProc, LPVOID pUserData, QUERYACCEPTPROC pQueryAccept, CLEANUPPROC pCleanUp, LPCRITICAL_SECTION pCritSec, IMemAllocator *, IPin ** ppPin);
HRESULT OutputPin_Construct(const IPinVtbl *OutputPin_Vtbl, long outputpin_size, const PIN_INFO * pPinInfo, ALLOCATOR_PROPERTIES *props, LPVOID pUserData, QUERYACCEPTPROC pQueryAccept, LPCRITICAL_SECTION pCritSec, IPin ** ppPin);
HRESULT PullPin_Construct(const IPinVtbl *PullPin_Vtbl, const PIN_INFO * pPinInfo, SAMPLEPROC_PULL pSampleProc, LPVOID pUserData, QUERYACCEPTPROC pQueryAccept, CLEANUPPROC pCleanUp, STOPPROCESSPROC, REQUESTPROC pCustomRequest, LPCRITICAL_SECTION pCritSec, IPin ** ppPin);

/**************************/
/*** Pin Implementation ***/

/* Common */
ULONG   WINAPI IPinImpl_AddRef(IPin * iface);
HRESULT WINAPI IPinImpl_Disconnect(IPin * iface);
HRESULT WINAPI IPinImpl_ConnectedTo(IPin * iface, IPin ** ppPin);
HRESULT WINAPI IPinImpl_ConnectionMediaType(IPin * iface, AM_MEDIA_TYPE * pmt);
HRESULT WINAPI IPinImpl_QueryPinInfo(IPin * iface, PIN_INFO * pInfo);
HRESULT WINAPI IPinImpl_QueryDirection(IPin * iface, PIN_DIRECTION * pPinDir);
HRESULT WINAPI IPinImpl_QueryId(IPin * iface, LPWSTR * Id);
HRESULT WINAPI IPinImpl_QueryAccept(IPin * iface, const AM_MEDIA_TYPE * pmt);
HRESULT WINAPI IPinImpl_EnumMediaTypes(IPin * iface, IEnumMediaTypes ** ppEnum);
HRESULT WINAPI IPinImpl_QueryInternalConnections(IPin * iface, IPin ** apPin, ULONG * cPin);

/* Input Pin */
HRESULT WINAPI InputPin_QueryInterface(IPin * iface, REFIID riid, LPVOID * ppv);
ULONG   WINAPI InputPin_Release(IPin * iface);
HRESULT WINAPI InputPin_Connect(IPin * iface, IPin * pConnector, const AM_MEDIA_TYPE * pmt);
HRESULT WINAPI InputPin_ReceiveConnection(IPin * iface, IPin * pReceivePin, const AM_MEDIA_TYPE * pmt);
HRESULT WINAPI InputPin_EndOfStream(IPin * iface);
HRESULT WINAPI InputPin_BeginFlush(IPin * iface);
HRESULT WINAPI InputPin_EndFlush(IPin * iface);
HRESULT WINAPI InputPin_NewSegment(IPin * iface, REFERENCE_TIME tStart, REFERENCE_TIME tStop, double dRate);

/* Output Pin */
HRESULT WINAPI OutputPin_QueryInterface(IPin * iface, REFIID riid, LPVOID * ppv);
ULONG   WINAPI OutputPin_Release(IPin * iface);
HRESULT WINAPI OutputPin_Connect(IPin * iface, IPin * pReceivePin, const AM_MEDIA_TYPE * pmt);
HRESULT WINAPI OutputPin_Disconnect(IPin * iface);
HRESULT WINAPI OutputPin_ReceiveConnection(IPin * iface, IPin * pReceivePin, const AM_MEDIA_TYPE * pmt);
HRESULT WINAPI OutputPin_EndOfStream(IPin * iface);
HRESULT WINAPI OutputPin_BeginFlush(IPin * iface);
HRESULT WINAPI OutputPin_EndFlush(IPin * iface);
HRESULT WINAPI OutputPin_NewSegment(IPin * iface, REFERENCE_TIME tStart, REFERENCE_TIME tStop, double dRate);

HRESULT OutputPin_CommitAllocator(OutputPin * This);
HRESULT OutputPin_DecommitAllocator(OutputPin * This);
HRESULT OutputPin_GetDeliveryBuffer(OutputPin * This, IMediaSample ** ppSample, REFERENCE_TIME * tStart, REFERENCE_TIME * tStop, DWORD dwFlags);
HRESULT OutputPin_SendSample(OutputPin * This, IMediaSample * pSample);
HRESULT OutputPin_DeliverDisconnect(OutputPin * This);

/* Pull Pin */
HRESULT WINAPI PullPin_ReceiveConnection(IPin * iface, IPin * pReceivePin, const AM_MEDIA_TYPE * pmt);
HRESULT WINAPI PullPin_Disconnect(IPin * iface);
HRESULT WINAPI PullPin_QueryInterface(IPin * iface, REFIID riid, LPVOID * ppv);
ULONG   WINAPI PullPin_Release(IPin * iface);
HRESULT WINAPI PullPin_EndOfStream(IPin * iface);
HRESULT WINAPI PullPin_BeginFlush(IPin * iface);
HRESULT WINAPI PullPin_EndFlush(IPin * iface);
HRESULT WINAPI PullPin_NewSegment(IPin * iface, REFERENCE_TIME tStart, REFERENCE_TIME tStop, double dRate);

/* Thread interaction functions: Hold the thread_lock before calling them */
HRESULT PullPin_StartProcessing(PullPin * This);
HRESULT PullPin_PauseProcessing(PullPin * This);
HRESULT PullPin_WaitForStateChange(PullPin * This, DWORD dwMilliseconds);

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