buffer.c

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/*
 * IDirectMusicBuffer Implementation
 *
 * Copyright (C) 2003-2004 Rok Mandeljc
 * Copyright (C) 2012 Christian Costa
 *
 * This program 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 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser 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 "dmusic_private.h"
#include "initguid.h"
#include "dmksctrl.h"
 
WINE_DEFAULT_DEBUG_CHANNEL(dmusic);
 
static inline IDirectMusicBufferImpl *impl_from_IDirectMusicBuffer(IDirectMusicBuffer *iface)
{
    return CONTAINING_RECORD(iface, IDirectMusicBufferImpl, IDirectMusicBuffer_iface);
}
 
/* IDirectMusicBufferImpl IUnknown part: */
static HRESULT WINAPI IDirectMusicBufferImpl_QueryInterface(LPDIRECTMUSICBUFFER iface, REFIID riid, LPVOID *ret_iface)
{
    TRACE("(%p)->(%s, %p)\n", iface, debugstr_dmguid(riid), ret_iface);
 
    if (IsEqualIID(riid, &IID_IUnknown) ||
        IsEqualIID(riid, &IID_IDirectMusicBuffer))
    {
        IDirectMusicBuffer_AddRef(iface);
        *ret_iface = iface;
        return S_OK;
    }
 
    *ret_iface = NULL;
 
    WARN("(%p)->(%s, %p): not found\n", iface, debugstr_dmguid(riid), ret_iface);
 
    return E_NOINTERFACE;
}
 
static ULONG WINAPI IDirectMusicBufferImpl_AddRef(LPDIRECTMUSICBUFFER iface)
{
    IDirectMusicBufferImpl *This = impl_from_IDirectMusicBuffer(iface);
    ULONG ref = InterlockedIncrement(&This->ref);
 
    TRACE("(%p): new ref = %lu\n", iface, ref);
 
    return ref;
}
 
static ULONG WINAPI IDirectMusicBufferImpl_Release(LPDIRECTMUSICBUFFER iface)
{
    IDirectMusicBufferImpl *This = impl_from_IDirectMusicBuffer(iface);
    ULONG ref = InterlockedDecrement(&This->ref);
 
    TRACE("(%p): new ref = %lu\n", iface, ref);
 
    if (!ref) {
        free(This->data);
        free(This);
    }
 
    return ref;
}
 
/* IDirectMusicBufferImpl IDirectMusicBuffer part: */
static HRESULT WINAPI IDirectMusicBufferImpl_Flush(LPDIRECTMUSICBUFFER iface)
{
    IDirectMusicBufferImpl *This = impl_from_IDirectMusicBuffer(iface);
 
    TRACE("(%p)->()\n", iface);
 
    This->write_pos = 0;
 
    return S_OK;
}
 
static HRESULT WINAPI IDirectMusicBufferImpl_TotalTime(LPDIRECTMUSICBUFFER iface, LPREFERENCE_TIME prtTime)
{
    IDirectMusicBufferImpl *This = impl_from_IDirectMusicBuffer(iface);
 
    FIXME("(%p, %p): stub\n", This, prtTime);
 
    return S_OK;
}
 
static HRESULT WINAPI IDirectMusicBufferImpl_PackStructured(LPDIRECTMUSICBUFFER iface, REFERENCE_TIME ref_time, DWORD channel_group, DWORD channel_message)
{
    IDirectMusicBufferImpl *This = impl_from_IDirectMusicBuffer(iface);
    DWORD new_write_pos = This->write_pos + DMUS_EVENT_SIZE(sizeof(channel_message));
    DMUS_EVENTHEADER *header;
 
    TRACE("(%p, 0x%s, %lu, %#lx)\n", iface, wine_dbgstr_longlong(ref_time), channel_group, channel_message);
 
    if (new_write_pos > This->size)
        return DMUS_E_BUFFER_FULL;
 
    /* Channel_message 0xZZYYXX (3 bytes) is a midi message where XX = status byte, YY = byte 1 and ZZ = byte 2 */
 
    if (!(channel_message & 0x80))
    {
        /* Status byte MSB is always set */
        return DMUS_E_INVALID_EVENT;
    }
 
    if (!This->write_pos)
        This->start_time = ref_time;
 
    header = (DMUS_EVENTHEADER*)&This->data[This->write_pos];
    header->cbEvent = 3; /* Midi message takes 4 bytes space but only 3 are relevant */
    header->dwChannelGroup = channel_group;
    header->rtDelta = ref_time - This->start_time;
    header->dwFlags = DMUS_EVENT_STRUCTURED;
 
    *(DWORD*)&header[1] = channel_message;
    This->write_pos = new_write_pos;
 
    return S_OK;
}
 
static HRESULT WINAPI IDirectMusicBufferImpl_PackUnstructured(IDirectMusicBuffer *iface,
        REFERENCE_TIME ref_time, DWORD channel_group, DWORD len, BYTE *data)
{
    IDirectMusicBufferImpl *This = impl_from_IDirectMusicBuffer(iface);
    DWORD new_write_pos = This->write_pos + DMUS_EVENT_SIZE(len);
    DMUS_EVENTHEADER *header;
 
    TRACE("(%p, 0x%s, %ld, %ld, %p)\n", This, wine_dbgstr_longlong(ref_time), channel_group, len, data);
 
    if (new_write_pos > This->size)
        return DMUS_E_BUFFER_FULL;
 
    if (!This->write_pos)
        This->start_time = ref_time;
 
    header = (DMUS_EVENTHEADER*)&This->data[This->write_pos];
    header->cbEvent = len;
    header->dwChannelGroup = channel_group;
    header->rtDelta = ref_time - This->start_time;
    header->dwFlags = 0;
 
    memcpy(&header[1], data, len);
    This->write_pos = new_write_pos;
 
    return S_OK;
}
 
static HRESULT WINAPI IDirectMusicBufferImpl_ResetReadPtr(LPDIRECTMUSICBUFFER iface)
{
    IDirectMusicBufferImpl *This = impl_from_IDirectMusicBuffer(iface);
 
    FIXME("(%p): stub\n", This);
 
    return S_OK;
}
 
static HRESULT WINAPI IDirectMusicBufferImpl_GetNextEvent(LPDIRECTMUSICBUFFER iface, LPREFERENCE_TIME prt, LPDWORD pdwChannelGroup, LPDWORD pdwLength, LPBYTE* ppData)
{
    IDirectMusicBufferImpl *This = impl_from_IDirectMusicBuffer(iface);
 
    FIXME("(%p, %p, %p, %p, %p): stub\n", This, prt, pdwChannelGroup, pdwLength, ppData);
 
    return S_OK;
}
 
static HRESULT WINAPI IDirectMusicBufferImpl_GetRawBufferPtr(LPDIRECTMUSICBUFFER iface, LPBYTE* data)
{
    IDirectMusicBufferImpl *This = impl_from_IDirectMusicBuffer(iface);
 
    TRACE("(%p)->(%p)\n", iface, data);
 
    if (!data)
        return E_POINTER;
 
    *data = This->data;
 
    return S_OK;
}
 
static HRESULT WINAPI IDirectMusicBufferImpl_GetStartTime(LPDIRECTMUSICBUFFER iface, LPREFERENCE_TIME ref_time)
{
    IDirectMusicBufferImpl *This = impl_from_IDirectMusicBuffer(iface);
 
    TRACE("(%p)->(%p)\n", iface, ref_time);
 
    if (!ref_time)
        return E_POINTER;
    if (!This->write_pos)
        return DMUS_E_BUFFER_EMPTY;
 
    *ref_time = This->start_time;
 
    return S_OK;
}
 
static HRESULT WINAPI IDirectMusicBufferImpl_GetUsedBytes(LPDIRECTMUSICBUFFER iface, LPDWORD used_bytes)
{
    IDirectMusicBufferImpl *This = impl_from_IDirectMusicBuffer(iface);
 
    TRACE("(%p)->(%p)\n", iface, used_bytes);
 
    if (!used_bytes)
        return E_POINTER;
 
    *used_bytes = This->write_pos;
 
    return S_OK;
}
 
static HRESULT WINAPI IDirectMusicBufferImpl_GetMaxBytes(LPDIRECTMUSICBUFFER iface, LPDWORD max_bytes)
{
    IDirectMusicBufferImpl *This = impl_from_IDirectMusicBuffer(iface);
 
    TRACE("(%p)->(%p)\n", iface, max_bytes);
 
    if (!max_bytes)
        return E_POINTER;
 
    *max_bytes = This->size;
 
    return S_OK;
}
 
static HRESULT WINAPI IDirectMusicBufferImpl_GetBufferFormat(LPDIRECTMUSICBUFFER iface, LPGUID format)
{
    IDirectMusicBufferImpl *This = impl_from_IDirectMusicBuffer(iface);
 
    TRACE("(%p)->(%p)\n", iface, format);
 
    if (!format)
        return E_POINTER;
 
    *format = This->format;
    return S_OK;
}
 
static HRESULT WINAPI IDirectMusicBufferImpl_SetStartTime(LPDIRECTMUSICBUFFER iface, REFERENCE_TIME ref_time)
{
    IDirectMusicBufferImpl *This = impl_from_IDirectMusicBuffer(iface);
 
    TRACE("(%p)->(0x%s)\n", This, wine_dbgstr_longlong(ref_time));
 
    This->start_time = ref_time;
 
    return S_OK;
}
 
static HRESULT WINAPI IDirectMusicBufferImpl_SetUsedBytes(LPDIRECTMUSICBUFFER iface, DWORD used_bytes)
{
    IDirectMusicBufferImpl *This = impl_from_IDirectMusicBuffer(iface);
 
    TRACE("(%p, %lu)\n", iface, used_bytes);
 
    if (used_bytes > This->size)
        return DMUS_E_BUFFER_FULL;
 
    This->write_pos = used_bytes;
 
    return S_OK;
}
 
static const IDirectMusicBufferVtbl DirectMusicBuffer_Vtbl = {
    IDirectMusicBufferImpl_QueryInterface,
    IDirectMusicBufferImpl_AddRef,
    IDirectMusicBufferImpl_Release,
    IDirectMusicBufferImpl_Flush,
    IDirectMusicBufferImpl_TotalTime,
    IDirectMusicBufferImpl_PackStructured,
    IDirectMusicBufferImpl_PackUnstructured,
    IDirectMusicBufferImpl_ResetReadPtr,
    IDirectMusicBufferImpl_GetNextEvent,
    IDirectMusicBufferImpl_GetRawBufferPtr,
    IDirectMusicBufferImpl_GetStartTime,
    IDirectMusicBufferImpl_GetUsedBytes,
    IDirectMusicBufferImpl_GetMaxBytes,
    IDirectMusicBufferImpl_GetBufferFormat,
    IDirectMusicBufferImpl_SetStartTime,
    IDirectMusicBufferImpl_SetUsedBytes
};
 
HRESULT DMUSIC_CreateDirectMusicBufferImpl(LPDMUS_BUFFERDESC desc, LPVOID* ret_iface)
{
    IDirectMusicBufferImpl* dmbuffer;
 
    TRACE("(%p, %p)\n", desc, ret_iface);
 
    *ret_iface = NULL;
 
    dmbuffer = calloc(1, sizeof(IDirectMusicBufferImpl));
    if (!dmbuffer)
        return E_OUTOFMEMORY;
 
    dmbuffer->IDirectMusicBuffer_iface.lpVtbl = &DirectMusicBuffer_Vtbl;
    dmbuffer->ref = 1;
 
    if (IsEqualGUID(&desc->guidBufferFormat, &GUID_NULL))
        dmbuffer->format = KSDATAFORMAT_SUBTYPE_MIDI;
    else
        dmbuffer->format = desc->guidBufferFormat;
    dmbuffer->size = (desc->cbBuffer + 3) & ~3; /* Buffer size must be multiple of 4 bytes */
 
    dmbuffer->data = malloc(dmbuffer->size);
    if (!dmbuffer->data) {
        free(dmbuffer);
        return E_OUTOFMEMORY;
    }
 
    *ret_iface = &dmbuffer->IDirectMusicBuffer_iface;
 
    return S_OK;
}