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/**
* FreeRDP: A Remote Desktop Protocol Implementation
* Audio Output Virtual Channel
*
* Copyright 2019 Armin Novak <armin.novak@thincast.com>
* Copyright 2019 Thincast Technologies GmbH
* Copyright 2020 Ingo Feinerer <feinerer@logic.at>
*
* 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.
*/
#include <freerdp/config.h>
#include <sndio.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <winpr/crt.h>
#include <winpr/stream.h>
#include <winpr/cmdline.h>
#include <freerdp/types.h>
#include "rdpsnd_main.h"
typedef struct
{
rdpsndDevicePlugin device;
struct sio_hdl* hdl;
struct sio_par par;
} rdpsndSndioPlugin;
static BOOL rdpsnd_sndio_open(rdpsndDevicePlugin* device, AUDIO_FORMAT* format, int latency)
{
rdpsndSndioPlugin* sndio = (rdpsndSndioPlugin*)device;
if (device == NULL || format == NULL)
return FALSE;
if (sndio->hdl != NULL)
return TRUE;
sndio->hdl = sio_open(SIO_DEVANY, SIO_PLAY, 0);
if (sndio->hdl == NULL)
{
WLog_ERR(TAG, "could not open audio device");
return FALSE;
}
sio_initpar(&sndio->par);
sndio->par.bits = format->wBitsPerSample;
sndio->par.pchan = format->nChannels;
sndio->par.rate = format->nSamplesPerSec;
if (!sio_setpar(sndio->hdl, &sndio->par))
{
WLog_ERR(TAG, "could not set audio parameters");
return FALSE;
}
if (!sio_getpar(sndio->hdl, &sndio->par))
{
WLog_ERR(TAG, "could not get audio parameters");
return FALSE;
}
if (!sio_start(sndio->hdl))
{
WLog_ERR(TAG, "could not start audio device");
return FALSE;
}
return TRUE;
}
static void rdpsnd_sndio_close(rdpsndDevicePlugin* device)
{
rdpsndSndioPlugin* sndio = (rdpsndSndioPlugin*)device;
if (device == NULL)
return;
if (sndio->hdl != NULL)
{
sio_stop(sndio->hdl);
sio_close(sndio->hdl);
sndio->hdl = NULL;
}
}
static BOOL rdpsnd_sndio_set_volume(rdpsndDevicePlugin* device, UINT32 value)
{
rdpsndSndioPlugin* sndio = (rdpsndSndioPlugin*)device;
if (device == NULL || sndio->hdl == NULL)
return FALSE;
/*
* Low-order word contains the left-channel volume setting.
* We ignore the right-channel volume setting in the high-order word.
*/
return sio_setvol(sndio->hdl, ((value & 0xFFFF) * SIO_MAXVOL) / 0xFFFF);
}
static void rdpsnd_sndio_free(rdpsndDevicePlugin* device)
{
rdpsndSndioPlugin* sndio = (rdpsndSndioPlugin*)device;
if (device == NULL)
return;
rdpsnd_sndio_close(device);
free(sndio);
}
static BOOL rdpsnd_sndio_format_supported(rdpsndDevicePlugin* device, AUDIO_FORMAT* format)
{
if (format == NULL)
return FALSE;
return (format->wFormatTag == WAVE_FORMAT_PCM);
}
static void rdpsnd_sndio_play(rdpsndDevicePlugin* device, BYTE* data, int size)
{
rdpsndSndioPlugin* sndio = (rdpsndSndioPlugin*)device;
if (device == NULL || sndio->hdl == NULL)
return;
sio_write(sndio->hdl, data, size);
}
/**
* Function description
*
* @return 0 on success, otherwise a Win32 error code
*/
static UINT rdpsnd_sndio_parse_addin_args(rdpsndDevicePlugin* device, ADDIN_ARGV* args)
{
int status;
DWORD flags;
COMMAND_LINE_ARGUMENT_A* arg;
rdpsndSndioPlugin* sndio = (rdpsndSndioPlugin*)device;
COMMAND_LINE_ARGUMENT_A rdpsnd_sndio_args[] = { { NULL, 0, NULL, NULL, NULL, -1, NULL, NULL } };
flags =
COMMAND_LINE_SIGIL_NONE | COMMAND_LINE_SEPARATOR_COLON | COMMAND_LINE_IGN_UNKNOWN_KEYWORD;
status = CommandLineParseArgumentsA(args->argc, (const char**)args->argv, rdpsnd_sndio_args,
flags, sndio, NULL, NULL);
if (status < 0)
return ERROR_INVALID_DATA;
arg = rdpsnd_sndio_args;
do
{
if (!(arg->Flags & COMMAND_LINE_VALUE_PRESENT))
continue;
CommandLineSwitchStart(arg) CommandLineSwitchEnd(arg)
} while ((arg = CommandLineFindNextArgumentA(arg)) != NULL);
return CHANNEL_RC_OK;
}
/**
* Function description
*
* @return 0 on success, otherwise a Win32 error code
*/
FREERDP_ENTRY_POINT(UINT sndio_freerdp_rdpsnd_client_subsystem_entry(
PFREERDP_RDPSND_DEVICE_ENTRY_POINTS pEntryPoints))
{
ADDIN_ARGV* args;
rdpsndSndioPlugin* sndio;
UINT ret = CHANNEL_RC_OK;
sndio = (rdpsndSndioPlugin*)calloc(1, sizeof(rdpsndSndioPlugin));
if (sndio == NULL)
return CHANNEL_RC_NO_MEMORY;
sndio->device.Open = rdpsnd_sndio_open;
sndio->device.FormatSupported = rdpsnd_sndio_format_supported;
sndio->device.SetVolume = rdpsnd_sndio_set_volume;
sndio->device.Play = rdpsnd_sndio_play;
sndio->device.Close = rdpsnd_sndio_close;
sndio->device.Free = rdpsnd_sndio_free;
args = pEntryPoints->args;
if (args->argc > 1)
{
ret = rdpsnd_sndio_parse_addin_args((rdpsndDevicePlugin*)sndio, args);
if (ret != CHANNEL_RC_OK)
{
WLog_ERR(TAG, "error parsing arguments");
goto error;
}
}
pEntryPoints->pRegisterRdpsndDevice(pEntryPoints->rdpsnd, &sndio->device);
return ret;
error:
rdpsnd_sndio_free(&sndio->device);
return ret;
}
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