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rdpsnd_main.c
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rdpsnd_main.c
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/**
* FreeRDP: A Remote Desktop Protocol Implementation
* Server Audio Virtual Channel
*
* Copyright 2012 Vic Lee
* Copyright 2015 Thincast Technologies GmbH
* Copyright 2015 DI (FH) Martin Haimberger <martin.haimberger@thincast.com>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <winpr/crt.h>
#include <winpr/assert.h>
#include <winpr/print.h>
#include <winpr/stream.h>
#include <freerdp/channels/log.h>
#include "rdpsnd_common.h"
#include "rdpsnd_main.h"
static wStream* rdpsnd_server_get_buffer(RdpsndServerContext* context)
{
wStream* s;
WINPR_ASSERT(context);
WINPR_ASSERT(context->priv);
s = context->priv->rdpsnd_pdu;
Stream_SetPosition(s, 0);
return s;
}
/**
* Send Server Audio Formats and Version PDU (2.2.2.1)
*
* @return 0 on success, otherwise a Win32 error code
*/
static UINT rdpsnd_server_send_formats(RdpsndServerContext* context)
{
wStream* s = rdpsnd_server_get_buffer(context);
size_t pos;
UINT16 i;
BOOL status = FALSE;
ULONG written;
if (!Stream_EnsureRemainingCapacity(s, 24))
return ERROR_OUTOFMEMORY;
Stream_Write_UINT8(s, SNDC_FORMATS);
Stream_Write_UINT8(s, 0);
Stream_Seek_UINT16(s);
Stream_Write_UINT32(s, 0); /* dwFlags */
Stream_Write_UINT32(s, 0); /* dwVolume */
Stream_Write_UINT32(s, 0); /* dwPitch */
Stream_Write_UINT16(s, 0); /* wDGramPort */
Stream_Write_UINT16(s, context->num_server_formats); /* wNumberOfFormats */
Stream_Write_UINT8(s, context->block_no); /* cLastBlockConfirmed */
Stream_Write_UINT16(s, CHANNEL_VERSION_WIN_MAX); /* wVersion */
Stream_Write_UINT8(s, 0); /* bPad */
for (i = 0; i < context->num_server_formats; i++)
{
const AUDIO_FORMAT* format = &context->server_formats[i];
if (!audio_format_write(s, format))
goto fail;
}
pos = Stream_GetPosition(s);
Stream_SetPosition(s, 2);
Stream_Write_UINT16(s, pos - 4);
Stream_SetPosition(s, pos);
WINPR_ASSERT(context->priv);
status = WTSVirtualChannelWrite(context->priv->ChannelHandle, (PCHAR)Stream_Buffer(s),
Stream_GetPosition(s), &written);
Stream_SetPosition(s, 0);
fail:
return status ? CHANNEL_RC_OK : ERROR_INTERNAL_ERROR;
}
/**
* Read Wave Confirm PDU (2.2.3.8) and handle callback
*
* @return 0 on success, otherwise a Win32 error code
*/
static UINT rdpsnd_server_recv_waveconfirm(RdpsndServerContext* context, wStream* s)
{
UINT16 timestamp;
BYTE confirmBlockNum;
UINT error = CHANNEL_RC_OK;
WINPR_ASSERT(context);
if (!Stream_CheckAndLogRequiredLength(TAG, s, 4))
return ERROR_INVALID_DATA;
Stream_Read_UINT16(s, timestamp);
Stream_Read_UINT8(s, confirmBlockNum);
Stream_Seek_UINT8(s);
IFCALLRET(context->ConfirmBlock, error, context, confirmBlockNum, timestamp);
if (error)
WLog_ERR(TAG, "context->ConfirmBlock failed with error %" PRIu32 "", error);
return error;
}
/**
* Read Training Confirm PDU (2.2.3.2) and handle callback
*
* @return 0 on success, otherwise a Win32 error code
*/
static UINT rdpsnd_server_recv_trainingconfirm(RdpsndServerContext* context, wStream* s)
{
UINT16 timestamp;
UINT16 packsize;
UINT error = CHANNEL_RC_OK;
WINPR_ASSERT(context);
if (!Stream_CheckAndLogRequiredLength(TAG, s, 4))
return ERROR_INVALID_DATA;
Stream_Read_UINT16(s, timestamp);
Stream_Read_UINT16(s, packsize);
IFCALLRET(context->TrainingConfirm, error, context, timestamp, packsize);
if (error)
WLog_ERR(TAG, "context->TrainingConfirm failed with error %" PRIu32 "", error);
return error;
}
/**
* Read Quality Mode PDU (2.2.2.3)
*
* @return 0 on success, otherwise a Win32 error code
*/
static UINT rdpsnd_server_recv_quality_mode(RdpsndServerContext* context, wStream* s)
{
WINPR_ASSERT(context);
if (Stream_GetRemainingLength(s) < 4)
{
WLog_ERR(TAG, "not enough data in stream!");
return ERROR_INVALID_DATA;
}
Stream_Read_UINT16(s, context->qualityMode); /* wQualityMode */
Stream_Seek_UINT16(s); /* Reserved */
WLog_DBG(TAG, "Client requested sound quality: 0x%04" PRIX16 "", context->qualityMode);
return CHANNEL_RC_OK;
}
/**
* Read Client Audio Formats and Version PDU (2.2.2.2)
*
* @return 0 on success, otherwise a Win32 error code
*/
static UINT rdpsnd_server_recv_formats(RdpsndServerContext* context, wStream* s)
{
UINT16 i, num_known_format = 0;
UINT16 udpPort;
BYTE lastblock;
UINT error = CHANNEL_RC_OK;
WINPR_ASSERT(context);
if (!Stream_CheckAndLogRequiredLength(TAG, s, 20))
return ERROR_INVALID_DATA;
Stream_Read_UINT32(s, context->capsFlags); /* dwFlags */
Stream_Read_UINT32(s, context->initialVolume); /* dwVolume */
Stream_Read_UINT32(s, context->initialPitch); /* dwPitch */
Stream_Read_UINT16(s, udpPort); /* wDGramPort */
Stream_Read_UINT16(s, context->num_client_formats); /* wNumberOfFormats */
Stream_Read_UINT8(s, lastblock); /* cLastBlockConfirmed */
Stream_Read_UINT16(s, context->clientVersion); /* wVersion */
Stream_Seek_UINT8(s); /* bPad */
/* this check is only a guess as cbSize can influence the size of a format record */
if (!Stream_CheckAndLogRequiredLength(TAG, s, 18ull * context->num_client_formats))
return ERROR_INVALID_DATA;
if (!context->num_client_formats)
{
WLog_ERR(TAG, "client doesn't support any format!");
return ERROR_INTERNAL_ERROR;
}
context->client_formats = audio_formats_new(context->num_client_formats);
if (!context->client_formats)
{
WLog_ERR(TAG, "calloc failed!");
return CHANNEL_RC_NO_MEMORY;
}
for (i = 0; i < context->num_client_formats; i++)
{
AUDIO_FORMAT* format = &context->client_formats[i];
if (!Stream_CheckAndLogRequiredLength(TAG, s, 18))
{
WLog_ERR(TAG, "not enough data in stream!");
error = ERROR_INVALID_DATA;
goto out_free;
}
Stream_Read_UINT16(s, format->wFormatTag);
Stream_Read_UINT16(s, format->nChannels);
Stream_Read_UINT32(s, format->nSamplesPerSec);
Stream_Read_UINT32(s, format->nAvgBytesPerSec);
Stream_Read_UINT16(s, format->nBlockAlign);
Stream_Read_UINT16(s, format->wBitsPerSample);
Stream_Read_UINT16(s, format->cbSize);
if (format->cbSize > 0)
{
if (!Stream_SafeSeek(s, format->cbSize))
{
WLog_ERR(TAG, "Stream_SafeSeek failed!");
error = ERROR_INTERNAL_ERROR;
goto out_free;
}
}
if (format->wFormatTag != 0)
{
// lets call this a known format
// TODO: actually look through our own list of known formats
num_known_format++;
}
}
if (!context->num_client_formats)
{
WLog_ERR(TAG, "client doesn't support any known format!");
goto out_free;
}
return CHANNEL_RC_OK;
out_free:
free(context->client_formats);
return error;
}
static DWORD WINAPI rdpsnd_server_thread(LPVOID arg)
{
DWORD nCount = 0, status;
HANDLE events[2] = { 0 };
RdpsndServerContext* context = (RdpsndServerContext*)arg;
UINT error = CHANNEL_RC_OK;
WINPR_ASSERT(context);
WINPR_ASSERT(context->priv);
events[nCount++] = context->priv->channelEvent;
events[nCount++] = context->priv->StopEvent;
WINPR_ASSERT(nCount <= ARRAYSIZE(events));
while (TRUE)
{
status = WaitForMultipleObjects(nCount, events, FALSE, INFINITE);
if (status == WAIT_FAILED)
{
error = GetLastError();
WLog_ERR(TAG, "WaitForMultipleObjects failed with error %" PRIu32 "!", error);
break;
}
status = WaitForSingleObject(context->priv->StopEvent, 0);
if (status == WAIT_FAILED)
{
error = GetLastError();
WLog_ERR(TAG, "WaitForSingleObject failed with error %" PRIu32 "!", error);
break;
}
if (status == WAIT_OBJECT_0)
break;
if ((error = rdpsnd_server_handle_messages(context)))
{
WLog_ERR(TAG, "rdpsnd_server_handle_messages failed with error %" PRIu32 "", error);
break;
}
}
if (error && context->rdpcontext)
setChannelError(context->rdpcontext, error, "rdpsnd_server_thread reported an error");
ExitThread(error);
return error;
}
/**
* Function description
*
* @return 0 on success, otherwise a Win32 error code
*/
static UINT rdpsnd_server_initialize(RdpsndServerContext* context, BOOL ownThread)
{
WINPR_ASSERT(context);
WINPR_ASSERT(context->priv);
context->priv->ownThread = ownThread;
return context->Start(context);
}
/**
* Function description
*
* @return 0 on success, otherwise a Win32 error code
*/
static UINT rdpsnd_server_select_format(RdpsndServerContext* context, UINT16 client_format_index)
{
int bs;
int out_buffer_size;
AUDIO_FORMAT* format;
UINT error = CHANNEL_RC_OK;
WINPR_ASSERT(context);
WINPR_ASSERT(context->priv);
if ((client_format_index >= context->num_client_formats) || (!context->src_format))
{
WLog_ERR(TAG, "index %d is not correct.", client_format_index);
return ERROR_INVALID_DATA;
}
EnterCriticalSection(&context->priv->lock);
context->priv->src_bytes_per_sample = context->src_format->wBitsPerSample / 8;
context->priv->src_bytes_per_frame =
context->priv->src_bytes_per_sample * context->src_format->nChannels;
context->selected_client_format = client_format_index;
format = &context->client_formats[client_format_index];
if (format->nSamplesPerSec == 0)
{
WLog_ERR(TAG, "invalid Client Sound Format!!");
error = ERROR_INVALID_DATA;
goto out;
}
if (context->latency <= 0)
context->latency = 50;
context->priv->out_frames = context->src_format->nSamplesPerSec * context->latency / 1000;
if (context->priv->out_frames < 1)
context->priv->out_frames = 1;
switch (format->wFormatTag)
{
case WAVE_FORMAT_DVI_ADPCM:
bs = (format->nBlockAlign - 4 * format->nChannels) * 4;
context->priv->out_frames -= context->priv->out_frames % bs;
if (context->priv->out_frames < bs)
context->priv->out_frames = bs;
break;
case WAVE_FORMAT_ADPCM:
bs = (format->nBlockAlign - 7 * format->nChannels) * 2 / format->nChannels + 2;
context->priv->out_frames -= context->priv->out_frames % bs;
if (context->priv->out_frames < bs)
context->priv->out_frames = bs;
break;
}
context->priv->out_pending_frames = 0;
out_buffer_size = context->priv->out_frames * context->priv->src_bytes_per_frame;
if (context->priv->out_buffer_size < out_buffer_size)
{
BYTE* newBuffer;
newBuffer = (BYTE*)realloc(context->priv->out_buffer, out_buffer_size);
if (!newBuffer)
{
WLog_ERR(TAG, "realloc failed!");
error = CHANNEL_RC_NO_MEMORY;
goto out;
}
context->priv->out_buffer = newBuffer;
context->priv->out_buffer_size = out_buffer_size;
}
freerdp_dsp_context_reset(context->priv->dsp_context, format);
out:
LeaveCriticalSection(&context->priv->lock);
return error;
}
/**
* Send Training PDU (2.2.3.1)
*
* @return 0 on success, otherwise a Win32 error code
*/
static UINT rdpsnd_server_training(RdpsndServerContext* context, UINT16 timestamp, UINT16 packsize,
BYTE* data)
{
size_t end = 0;
ULONG written;
BOOL status;
wStream* s = rdpsnd_server_get_buffer(context);
if (!Stream_EnsureRemainingCapacity(s, 8))
return ERROR_INTERNAL_ERROR;
Stream_Write_UINT8(s, SNDC_TRAINING);
Stream_Write_UINT8(s, 0);
Stream_Seek_UINT16(s);
Stream_Write_UINT16(s, timestamp);
Stream_Write_UINT16(s, packsize);
if (packsize > 0)
{
if (!Stream_EnsureRemainingCapacity(s, packsize))
{
Stream_SetPosition(s, 0);
return ERROR_INTERNAL_ERROR;
}
Stream_Write(s, data, packsize);
}
end = Stream_GetPosition(s);
Stream_SetPosition(s, 2);
Stream_Write_UINT16(s, end - 4);
status = WTSVirtualChannelWrite(context->priv->ChannelHandle, (PCHAR)Stream_Buffer(s), end,
&written);
Stream_SetPosition(s, 0);
return status ? CHANNEL_RC_OK : ERROR_INTERNAL_ERROR;
}
static BOOL rdpsnd_server_align_wave_pdu(wStream* s, UINT32 alignment)
{
size_t size;
Stream_SealLength(s);
size = Stream_Length(s);
if ((size % alignment) != 0)
{
size_t offset = alignment - size % alignment;
if (!Stream_EnsureRemainingCapacity(s, offset))
return FALSE;
Stream_Zero(s, offset);
}
Stream_SealLength(s);
return TRUE;
}
/**
* Function description
* context->priv->lock should be obtained before calling this function
*
* @return 0 on success, otherwise a Win32 error code
*/
static UINT rdpsnd_server_send_wave_pdu(RdpsndServerContext* context, UINT16 wTimestamp)
{
size_t length;
size_t start, end = 0;
const BYTE* src;
AUDIO_FORMAT* format;
ULONG written;
UINT error = CHANNEL_RC_OK;
wStream* s = rdpsnd_server_get_buffer(context);
if (context->selected_client_format > context->num_client_formats)
return ERROR_INTERNAL_ERROR;
WINPR_ASSERT(context->client_formats);
format = &context->client_formats[context->selected_client_format];
/* WaveInfo PDU */
Stream_SetPosition(s, 0);
if (!Stream_EnsureRemainingCapacity(s, 16))
return ERROR_OUTOFMEMORY;
Stream_Write_UINT8(s, SNDC_WAVE); /* msgType */
Stream_Write_UINT8(s, 0); /* bPad */
Stream_Write_UINT16(s, 0); /* BodySize */
Stream_Write_UINT16(s, wTimestamp); /* wTimeStamp */
Stream_Write_UINT16(s, context->selected_client_format); /* wFormatNo */
Stream_Write_UINT8(s, context->block_no); /* cBlockNo */
Stream_Seek(s, 3); /* bPad */
start = Stream_GetPosition(s);
src = context->priv->out_buffer;
length = 1ull * context->priv->out_pending_frames * context->priv->src_bytes_per_frame;
if (!freerdp_dsp_encode(context->priv->dsp_context, context->src_format, src, length, s))
return ERROR_INTERNAL_ERROR;
else
{
/* Set stream size */
if (!rdpsnd_server_align_wave_pdu(s, format->nBlockAlign))
return ERROR_INTERNAL_ERROR;
end = Stream_GetPosition(s);
Stream_SetPosition(s, 2);
Stream_Write_UINT16(s, end - start + 8);
Stream_SetPosition(s, end);
if (!WTSVirtualChannelWrite(context->priv->ChannelHandle, (PCHAR)Stream_Buffer(s),
start + 4, &written))
{
WLog_ERR(TAG, "WTSVirtualChannelWrite failed!");
error = ERROR_INTERNAL_ERROR;
}
}
if (error != CHANNEL_RC_OK)
{
WLog_ERR(TAG, "WTSVirtualChannelWrite failed!");
error = ERROR_INTERNAL_ERROR;
goto out;
}
Stream_SetPosition(s, start);
Stream_Write_UINT32(s, 0); /* bPad */
Stream_SetPosition(s, start);
if (!WTSVirtualChannelWrite(context->priv->ChannelHandle, (PCHAR)Stream_Pointer(s), end - start,
&written))
{
WLog_ERR(TAG, "WTSVirtualChannelWrite failed!");
error = ERROR_INTERNAL_ERROR;
}
context->block_no = (context->block_no + 1) % 256;
out:
Stream_SetPosition(s, 0);
context->priv->out_pending_frames = 0;
return error;
}
/**
* Function description
* context->priv->lock should be obtained before calling this function
*
* @return 0 on success, otherwise a Win32 error code
*/
static UINT rdpsnd_server_send_wave2_pdu(RdpsndServerContext* context, UINT16 formatNo,
const BYTE* data, size_t size, BOOL encoded,
UINT16 timestamp, UINT32 audioTimeStamp)
{
size_t end = 0;
ULONG written;
UINT error = CHANNEL_RC_OK;
BOOL status;
wStream* s = rdpsnd_server_get_buffer(context);
if (!Stream_EnsureRemainingCapacity(s, 16))
{
error = ERROR_INTERNAL_ERROR;
goto out;
}
/* Wave2 PDU */
Stream_Write_UINT8(s, SNDC_WAVE2); /* msgType */
Stream_Write_UINT8(s, 0); /* bPad */
Stream_Write_UINT16(s, 0); /* BodySize */
Stream_Write_UINT16(s, timestamp); /* wTimeStamp */
Stream_Write_UINT16(s, formatNo); /* wFormatNo */
Stream_Write_UINT8(s, context->block_no); /* cBlockNo */
Stream_Write_UINT8(s, 0); /* bPad */
Stream_Write_UINT8(s, 0); /* bPad */
Stream_Write_UINT8(s, 0); /* bPad */
Stream_Write_UINT32(s, audioTimeStamp); /* dwAudioTimeStamp */
if (encoded)
{
if (!Stream_EnsureRemainingCapacity(s, size))
{
error = ERROR_INTERNAL_ERROR;
goto out;
}
Stream_Write(s, data, size);
}
else
{
AUDIO_FORMAT* format;
if (!freerdp_dsp_encode(context->priv->dsp_context, context->src_format, data, size, s))
{
error = ERROR_INTERNAL_ERROR;
goto out;
}
format = &context->client_formats[formatNo];
if (!rdpsnd_server_align_wave_pdu(s, format->nBlockAlign))
{
error = ERROR_INTERNAL_ERROR;
goto out;
}
}
end = Stream_GetPosition(s);
Stream_SetPosition(s, 2);
Stream_Write_UINT16(s, end - 4);
status = WTSVirtualChannelWrite(context->priv->ChannelHandle, (PCHAR)Stream_Buffer(s), end,
&written);
if (!status || (end != written))
{
WLog_ERR(TAG, "WTSVirtualChannelWrite failed! [stream length=%" PRIdz " - written=%" PRIu32,
end, written);
error = ERROR_INTERNAL_ERROR;
}
context->block_no = (context->block_no + 1) % 256;
out:
Stream_SetPosition(s, 0);
context->priv->out_pending_frames = 0;
return error;
}
/* Wrapper function to send WAVE or WAVE2 PDU depending on client connected */
static UINT rdpsnd_server_send_audio_pdu(RdpsndServerContext* context, UINT16 wTimestamp)
{
const BYTE* src;
size_t length;
WINPR_ASSERT(context);
WINPR_ASSERT(context->priv);
if (context->selected_client_format >= context->num_client_formats)
return ERROR_INTERNAL_ERROR;
src = context->priv->out_buffer;
length = context->priv->out_pending_frames * context->priv->src_bytes_per_frame;
if (context->clientVersion >= CHANNEL_VERSION_WIN_8)
return rdpsnd_server_send_wave2_pdu(context, context->selected_client_format, src, length,
FALSE, wTimestamp, wTimestamp);
else
return rdpsnd_server_send_wave_pdu(context, wTimestamp);
}
/**
* Function description
*
* @return 0 on success, otherwise a Win32 error code
*/
static UINT rdpsnd_server_send_samples(RdpsndServerContext* context, const void* buf, int nframes,
UINT16 wTimestamp)
{
UINT error = CHANNEL_RC_OK;
WINPR_ASSERT(context);
WINPR_ASSERT(context->priv);
EnterCriticalSection(&context->priv->lock);
if (context->selected_client_format >= context->num_client_formats)
{
/* It's possible while format negotiation has not been done */
WLog_WARN(TAG, "Drop samples because client format has not been negotiated.");
error = ERROR_NOT_READY;
goto out;
}
while (nframes > 0)
{
const size_t cframes =
MIN(nframes, context->priv->out_frames - context->priv->out_pending_frames);
size_t cframesize = cframes * context->priv->src_bytes_per_frame;
CopyMemory(context->priv->out_buffer +
(context->priv->out_pending_frames * context->priv->src_bytes_per_frame),
buf, cframesize);
buf = (const BYTE*)buf + cframesize;
nframes -= cframes;
context->priv->out_pending_frames += cframes;
if (context->priv->out_pending_frames >= context->priv->out_frames)
{
if ((error = rdpsnd_server_send_audio_pdu(context, wTimestamp)))
{
WLog_ERR(TAG, "rdpsnd_server_send_audio_pdu failed with error %" PRIu32 "", error);
break;
}
}
}
out:
LeaveCriticalSection(&context->priv->lock);
return error;
}
/**
* Send encoded audio samples using a Wave2 PDU.
*
* @return 0 on success, otherwise a Win32 error code
*/
static UINT rdpsnd_server_send_samples2(RdpsndServerContext* context, UINT16 formatNo,
const void* buf, size_t size, UINT16 timestamp,
UINT32 audioTimeStamp)
{
UINT error = CHANNEL_RC_OK;
WINPR_ASSERT(context);
WINPR_ASSERT(context->priv);
if (context->clientVersion < CHANNEL_VERSION_WIN_8)
return ERROR_INTERNAL_ERROR;
EnterCriticalSection(&context->priv->lock);
error =
rdpsnd_server_send_wave2_pdu(context, formatNo, buf, size, TRUE, timestamp, audioTimeStamp);
LeaveCriticalSection(&context->priv->lock);
return error;
}
/**
* Function description
*
* @return 0 on success, otherwise a Win32 error code
*/
static UINT rdpsnd_server_set_volume(RdpsndServerContext* context, int left, int right)
{
size_t len;
BOOL status;
ULONG written;
wStream* s = rdpsnd_server_get_buffer(context);
if (!Stream_EnsureRemainingCapacity(s, 8))
return ERROR_NOT_ENOUGH_MEMORY;
Stream_Write_UINT8(s, SNDC_SETVOLUME);
Stream_Write_UINT8(s, 0);
Stream_Write_UINT16(s, 4); /* Payload length */
Stream_Write_UINT16(s, left);
Stream_Write_UINT16(s, right);
len = Stream_GetPosition(s);
status = WTSVirtualChannelWrite(context->priv->ChannelHandle, (PCHAR)Stream_Buffer(s),
(ULONG)len, &written);
Stream_SetPosition(s, 0);
return status ? CHANNEL_RC_OK : ERROR_INTERNAL_ERROR;
}
/**
* Function description
*
* @return 0 on success, otherwise a Win32 error code
*/
static UINT rdpsnd_server_close(RdpsndServerContext* context)
{
size_t pos;
BOOL status;
ULONG written;
UINT error = CHANNEL_RC_OK;
wStream* s = rdpsnd_server_get_buffer(context);
EnterCriticalSection(&context->priv->lock);
if (context->priv->out_pending_frames > 0)
{
if (context->selected_client_format >= context->num_client_formats)
{
WLog_ERR(TAG, "Pending audio frame exists while no format selected.");
error = ERROR_INVALID_DATA;
}
else if ((error = rdpsnd_server_send_audio_pdu(context, 0)))
{
WLog_ERR(TAG, "rdpsnd_server_send_audio_pdu failed with error %" PRIu32 "", error);
}
}
LeaveCriticalSection(&context->priv->lock);
if (error)
return error;
context->selected_client_format = 0xFFFF;
if (!Stream_EnsureRemainingCapacity(s, 4))
return ERROR_OUTOFMEMORY;
Stream_Write_UINT8(s, SNDC_CLOSE);
Stream_Write_UINT8(s, 0);
Stream_Seek_UINT16(s);
pos = Stream_GetPosition(s);
Stream_SetPosition(s, 2);
Stream_Write_UINT16(s, pos - 4);
Stream_SetPosition(s, pos);
status = WTSVirtualChannelWrite(context->priv->ChannelHandle, (PCHAR)Stream_Buffer(s),
Stream_GetPosition(s), &written);
Stream_SetPosition(s, 0);
return status ? CHANNEL_RC_OK : ERROR_INTERNAL_ERROR;
}
/**
* Function description
*
* @return 0 on success, otherwise a Win32 error code
*/
static UINT rdpsnd_server_start(RdpsndServerContext* context)
{
void* buffer = NULL;
DWORD bytesReturned;
RdpsndServerPrivate* priv;
UINT error = ERROR_INTERNAL_ERROR;
PULONG pSessionId = NULL;
WINPR_ASSERT(context);
WINPR_ASSERT(context->priv);
priv = context->priv;
priv->SessionId = WTS_CURRENT_SESSION;
if (context->use_dynamic_virtual_channel)
{
UINT32 channelId;
BOOL status = TRUE;
if (WTSQuerySessionInformationA(context->vcm, WTS_CURRENT_SESSION, WTSSessionId,
(LPSTR*)&pSessionId, &bytesReturned))
{
priv->SessionId = (DWORD)*pSessionId;
WTSFreeMemory(pSessionId);
priv->ChannelHandle = (HANDLE)WTSVirtualChannelOpenEx(
priv->SessionId, "AUDIO_PLAYBACK_DVC", WTS_CHANNEL_OPTION_DYNAMIC);
if (!priv->ChannelHandle)
{
WLog_ERR(TAG, "Open audio dynamic virtual channel (AUDIO_PLAYBACK_DVC) failed!");
return ERROR_INTERNAL_ERROR;
}
channelId = WTSChannelGetIdByHandle(priv->ChannelHandle);
IFCALLRET(context->ChannelIdAssigned, status, context, channelId);
if (!status)
{
WLog_ERR(TAG, "context->ChannelIdAssigned failed!");
goto out_close;
}
}
else
{
WLog_ERR(TAG, "WTSQuerySessionInformationA failed!");
return ERROR_INTERNAL_ERROR;
}
}
else
{
priv->ChannelHandle =
WTSVirtualChannelOpen(context->vcm, WTS_CURRENT_SESSION, "rdpsnd");
if (!priv->ChannelHandle)
{
WLog_ERR(TAG, "Open audio static virtual channel (rdpsnd) failed!");
return ERROR_INTERNAL_ERROR;
}
}
if (!WTSVirtualChannelQuery(priv->ChannelHandle, WTSVirtualEventHandle, &buffer,
&bytesReturned) ||
(bytesReturned != sizeof(HANDLE)))
{
WLog_ERR(TAG,
"error during WTSVirtualChannelQuery(WTSVirtualEventHandle) or invalid returned "
"size(%" PRIu32 ")",
bytesReturned);
if (buffer)
WTSFreeMemory(buffer);
goto out_close;
}
CopyMemory(&priv->channelEvent, buffer, sizeof(HANDLE));
WTSFreeMemory(buffer);
priv->rdpsnd_pdu = Stream_New(NULL, 4096);
if (!priv->rdpsnd_pdu)
{
WLog_ERR(TAG, "Stream_New failed!");
error = CHANNEL_RC_NO_MEMORY;
goto out_close;
}
if (!InitializeCriticalSectionEx(&context->priv->lock, 0, 0))
{
WLog_ERR(TAG, "InitializeCriticalSectionEx failed!");
goto out_pdu;
}
if ((error = rdpsnd_server_send_formats(context)))
{
WLog_ERR(TAG, "rdpsnd_server_send_formats failed with error %" PRIu32 "", error);
goto out_lock;
}
if (priv->ownThread)
{
context->priv->StopEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
if (!context->priv->StopEvent)
{
WLog_ERR(TAG, "CreateEvent failed!");
goto out_lock;
}
context->priv->Thread =
CreateThread(NULL, 0, rdpsnd_server_thread, (void*)context, 0, NULL);
if (!context->priv->Thread)
{
WLog_ERR(TAG, "CreateThread failed!");
goto out_stopEvent;
}
}
return CHANNEL_RC_OK;
out_stopEvent:
CloseHandle(context->priv->StopEvent);
context->priv->StopEvent = NULL;
out_lock:
DeleteCriticalSection(&context->priv->lock);
out_pdu:
Stream_Free(context->priv->rdpsnd_pdu, TRUE);
context->priv->rdpsnd_pdu = NULL;
out_close:
WTSVirtualChannelClose(context->priv->ChannelHandle);
context->priv->ChannelHandle = NULL;
return error;
}
/**
* Function description
*
* @return 0 on success, otherwise a Win32 error code
*/
static UINT rdpsnd_server_stop(RdpsndServerContext* context)
{
UINT error = CHANNEL_RC_OK;
WINPR_ASSERT(context);
WINPR_ASSERT(context->priv);
if (!context->priv->StopEvent)
return error;
if (context->priv->ownThread)
{
if (context->priv->StopEvent)
{
SetEvent(context->priv->StopEvent);
if (WaitForSingleObject(context->priv->Thread, INFINITE) == WAIT_FAILED)
{
error = GetLastError();
WLog_ERR(TAG, "WaitForSingleObject failed with error %" PRIu32 "!", error);
return error;
}