audin_winmm.c

 
#include <freerdp/config.h>
 
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
#include <windows.h>
#include <mmsystem.h>
 
#include <winpr/crt.h>
#include <winpr/wtsapi.h>
#include <winpr/cmdline.h>
#include <freerdp/freerdp.h>
#include <freerdp/addin.h>
#include <freerdp/client/audin.h>
 
#include "audin_main.h"
 
/* fix missing definitions in mingw */
#ifndef WAVE_MAPPED_DEFAULT_COMMUNICATION_DEVICE
#define WAVE_MAPPED_DEFAULT_COMMUNICATION_DEVICE 0x0010
#endif
 
typedef struct
{
  IAudinDevice iface;
 
  char* device_name;
  AudinReceive receive;
  void* user_data;
  HANDLE thread;
  HANDLE stopEvent;
  HWAVEIN hWaveIn;
  PWAVEFORMATEX* ppwfx;
  PWAVEFORMATEX pwfx_cur;
  UINT32 ppwfx_size;
  UINT32 cFormats;
  UINT32 frames_per_packet;
  rdpContext* rdpcontext;
  wLog* log;
} AudinWinmmDevice;
 
static void CALLBACK waveInProc(HWAVEIN hWaveIn, UINT uMsg, DWORD_PTR dwInstance,
                                DWORD_PTR dwParam1, DWORD_PTR dwParam2)
{
  AudinWinmmDevice* winmm = (AudinWinmmDevice*)dwInstance;
  PWAVEHDR pWaveHdr;
  UINT error = CHANNEL_RC_OK;
  MMRESULT mmResult;
 
  switch (uMsg)
  {
    case WIM_CLOSE:
      break;
 
    case WIM_DATA:
      pWaveHdr = (WAVEHDR*)dwParam1;
 
      if (WHDR_DONE == (WHDR_DONE & pWaveHdr->dwFlags))
      {
        if (pWaveHdr->dwBytesRecorded &&
            !(WaitForSingleObject(winmm->stopEvent, 0) == WAIT_OBJECT_0))
        {
          AUDIO_FORMAT format;
          format.cbSize = winmm->pwfx_cur->cbSize;
          format.nBlockAlign = winmm->pwfx_cur->nBlockAlign;
          format.nAvgBytesPerSec = winmm->pwfx_cur->nAvgBytesPerSec;
          format.nChannels = winmm->pwfx_cur->nChannels;
          format.nSamplesPerSec = winmm->pwfx_cur->nSamplesPerSec;
          format.wBitsPerSample = winmm->pwfx_cur->wBitsPerSample;
          format.wFormatTag = winmm->pwfx_cur->wFormatTag;
 
          if ((error = winmm->receive(&format, pWaveHdr->lpData,
                                      pWaveHdr->dwBytesRecorded, winmm->user_data)))
            break;
 
          mmResult = waveInAddBuffer(hWaveIn, pWaveHdr, sizeof(WAVEHDR));
 
          if (mmResult != MMSYSERR_NOERROR)
            error = ERROR_INTERNAL_ERROR;
        }
      }
 
      break;
 
    case WIM_OPEN:
      break;
 
    default:
      break;
  }
 
  if (error && winmm->rdpcontext)
    setChannelError(winmm->rdpcontext, error, "waveInProc reported an error");
}
 
static BOOL log_mmresult(AudinWinmmDevice* winmm, const char* what, MMRESULT result)
{
  if (result != MMSYSERR_NOERROR)
  {
    CHAR buffer[8192] = WINPR_C_ARRAY_INIT;
    CHAR msg[8192] = WINPR_C_ARRAY_INIT;
    CHAR cmsg[8192] = WINPR_C_ARRAY_INIT;
    waveInGetErrorTextA(result, buffer, sizeof(buffer));
 
    _snprintf(msg, sizeof(msg) - 1, "%s failed. %" PRIu32 " [%s]", what, result, buffer);
    _snprintf(cmsg, sizeof(cmsg) - 1, "audin_winmm_thread_func reported an error '%s'", msg);
    WLog_Print(winmm->log, WLOG_DEBUG, "%s", msg);
    if (winmm->rdpcontext)
      setChannelError(winmm->rdpcontext, ERROR_INTERNAL_ERROR, cmsg);
    return FALSE;
  }
  return TRUE;
}
 
static BOOL test_format_supported(const PWAVEFORMATEX pwfx)
{
  MMRESULT rc;
  WAVEINCAPSA caps = WINPR_C_ARRAY_INIT;
 
  rc = waveInGetDevCapsA(WAVE_MAPPER, &caps, sizeof(caps));
  if (rc != MMSYSERR_NOERROR)
    return FALSE;
 
  switch (pwfx->nChannels)
  {
    case 1:
      if ((caps.dwFormats &
           (WAVE_FORMAT_1M08 | WAVE_FORMAT_2M08 | WAVE_FORMAT_4M08 | WAVE_FORMAT_96M08 |
            WAVE_FORMAT_1M16 | WAVE_FORMAT_2M16 | WAVE_FORMAT_4M16 | WAVE_FORMAT_96M16)) == 0)
        return FALSE;
      break;
    case 2:
      if ((caps.dwFormats &
           (WAVE_FORMAT_1S08 | WAVE_FORMAT_2S08 | WAVE_FORMAT_4S08 | WAVE_FORMAT_96S08 |
            WAVE_FORMAT_1S16 | WAVE_FORMAT_2S16 | WAVE_FORMAT_4S16 | WAVE_FORMAT_96S16)) == 0)
        return FALSE;
      break;
    default:
      return FALSE;
  }
 
  rc = waveInOpen(nullptr, WAVE_MAPPER, pwfx, 0, 0,
                  WAVE_FORMAT_QUERY | WAVE_MAPPED_DEFAULT_COMMUNICATION_DEVICE);
  return (rc == MMSYSERR_NOERROR);
}
 
static DWORD WINAPI audin_winmm_thread_func(LPVOID arg)
{
  AudinWinmmDevice* winmm = (AudinWinmmDevice*)arg;
  char* buffer = nullptr;
  int size = 0;
  WAVEHDR waveHdr[4] = WINPR_C_ARRAY_INIT;
  DWORD status = 0;
  MMRESULT rc = 0;
 
  if (!winmm->hWaveIn)
  {
    rc = waveInOpen(&winmm->hWaveIn, WAVE_MAPPER, winmm->pwfx_cur, (DWORD_PTR)waveInProc,
                    (DWORD_PTR)winmm,
                    CALLBACK_FUNCTION | WAVE_MAPPED_DEFAULT_COMMUNICATION_DEVICE);
    if (!log_mmresult(winmm, "waveInOpen", rc))
      return ERROR_INTERNAL_ERROR;
  }
 
  size =
      (winmm->pwfx_cur->wBitsPerSample * winmm->pwfx_cur->nChannels * winmm->frames_per_packet +
       7) /
      8;
 
  for (int i = 0; i < 4; i++)
  {
    buffer = (char*)malloc(size);
 
    if (!buffer)
      return CHANNEL_RC_NO_MEMORY;
 
    waveHdr[i].dwBufferLength = size;
    waveHdr[i].dwFlags = 0;
    waveHdr[i].lpData = buffer;
    rc = waveInPrepareHeader(winmm->hWaveIn, &waveHdr[i], sizeof(waveHdr[i]));
 
    if (!log_mmresult(winmm, "waveInPrepareHeader", rc))
    {
    }
 
    rc = waveInAddBuffer(winmm->hWaveIn, &waveHdr[i], sizeof(waveHdr[i]));
 
    if (!log_mmresult(winmm, "waveInAddBuffer", rc))
    {
    }
  }
 
  rc = waveInStart(winmm->hWaveIn);
 
  if (!log_mmresult(winmm, "waveInStart", rc))
  {
  }
 
  status = WaitForSingleObject(winmm->stopEvent, INFINITE);
 
  if (status == WAIT_FAILED)
  {
    WLog_Print(winmm->log, WLOG_DEBUG, "WaitForSingleObject failed.");
 
    if (winmm->rdpcontext)
      setChannelError(winmm->rdpcontext, ERROR_INTERNAL_ERROR,
                      "audin_winmm_thread_func reported an error");
  }
 
  rc = waveInReset(winmm->hWaveIn);
 
  if (!log_mmresult(winmm, "waveInReset", rc))
  {
  }
 
  for (int i = 0; i < 4; i++)
  {
    rc = waveInUnprepareHeader(winmm->hWaveIn, &waveHdr[i], sizeof(waveHdr[i]));
 
    if (!log_mmresult(winmm, "waveInUnprepareHeader", rc))
    {
    }
 
    free(waveHdr[i].lpData);
  }
 
  rc = waveInClose(winmm->hWaveIn);
 
  if (!log_mmresult(winmm, "waveInClose", rc))
  {
  }
 
  winmm->hWaveIn = nullptr;
  return 0;
}
 
static UINT audin_winmm_free(IAudinDevice* device)
{
  AudinWinmmDevice* winmm = (AudinWinmmDevice*)device;
 
  if (!winmm)
    return ERROR_INVALID_PARAMETER;
 
  for (UINT32 i = 0; i < winmm->cFormats; i++)
  {
    free(winmm->ppwfx[i]);
  }
 
  free(winmm->ppwfx);
  free(winmm->device_name);
  free(winmm);
  return CHANNEL_RC_OK;
}
 
static UINT audin_winmm_close(IAudinDevice* device)
{
  DWORD status;
  UINT error = CHANNEL_RC_OK;
  AudinWinmmDevice* winmm = (AudinWinmmDevice*)device;
 
  if (!winmm)
    return ERROR_INVALID_PARAMETER;
 
  (void)SetEvent(winmm->stopEvent);
  status = WaitForSingleObject(winmm->thread, INFINITE);
 
  if (status == WAIT_FAILED)
  {
    error = GetLastError();
    WLog_Print(winmm->log, WLOG_ERROR, "WaitForSingleObject failed with error %" PRIu32 "!",
               error);
    return error;
  }
 
  (void)CloseHandle(winmm->thread);
  (void)CloseHandle(winmm->stopEvent);
  winmm->thread = nullptr;
  winmm->stopEvent = nullptr;
  winmm->receive = nullptr;
  winmm->user_data = nullptr;
  return error;
}
 
static UINT audin_winmm_set_format(IAudinDevice* device, const AUDIO_FORMAT* format,
                                   UINT32 FramesPerPacket)
{
  AudinWinmmDevice* winmm = (AudinWinmmDevice*)device;
 
  if (!winmm || !format)
    return ERROR_INVALID_PARAMETER;
 
  winmm->frames_per_packet = FramesPerPacket;
 
  for (UINT32 i = 0; i < winmm->cFormats; i++)
  {
    const PWAVEFORMATEX ppwfx = winmm->ppwfx[i];
    if ((ppwfx->wFormatTag == format->wFormatTag) && (ppwfx->nChannels == format->nChannels) &&
        (ppwfx->wBitsPerSample == format->wBitsPerSample) &&
        (ppwfx->nSamplesPerSec == format->nSamplesPerSec))
    {
      /* BUG: Many devices report to support stereo recording but fail here.
       *      Ensure we always use mono. */
      if (ppwfx->nChannels > 1)
      {
        ppwfx->nChannels = 1;
      }
 
      if (ppwfx->nBlockAlign != 2)
      {
        ppwfx->nBlockAlign = 2;
        ppwfx->nAvgBytesPerSec = ppwfx->nSamplesPerSec * ppwfx->nBlockAlign;
      }
 
      if (!test_format_supported(ppwfx))
        return ERROR_INVALID_PARAMETER;
      winmm->pwfx_cur = ppwfx;
      return CHANNEL_RC_OK;
    }
  }
 
  return ERROR_INVALID_PARAMETER;
}
 
static BOOL audin_winmm_format_supported(IAudinDevice* device, const AUDIO_FORMAT* format)
{
  AudinWinmmDevice* winmm = (AudinWinmmDevice*)device;
  PWAVEFORMATEX pwfx;
  BYTE* data;
 
  if (!winmm || !format)
    return FALSE;
 
  if (format->wFormatTag != WAVE_FORMAT_PCM)
    return FALSE;
 
  if (format->nChannels != 1)
    return FALSE;
 
  pwfx = (PWAVEFORMATEX)malloc(sizeof(WAVEFORMATEX) + format->cbSize);
 
  if (!pwfx)
    return FALSE;
 
  pwfx->cbSize = format->cbSize;
  pwfx->wFormatTag = format->wFormatTag;
  pwfx->nChannels = format->nChannels;
  pwfx->nSamplesPerSec = format->nSamplesPerSec;
  pwfx->nBlockAlign = format->nBlockAlign;
  pwfx->wBitsPerSample = format->wBitsPerSample;
  data = (BYTE*)pwfx + sizeof(WAVEFORMATEX);
  memcpy(data, format->data, format->cbSize);
 
  pwfx->nAvgBytesPerSec = pwfx->nSamplesPerSec * pwfx->nBlockAlign;
 
  if (!test_format_supported(pwfx))
    goto fail;
 
  if (winmm->cFormats >= winmm->ppwfx_size)
  {
    PWAVEFORMATEX* tmp_ppwfx;
    tmp_ppwfx = realloc(winmm->ppwfx, sizeof(PWAVEFORMATEX) * winmm->ppwfx_size * 2);
 
    if (!tmp_ppwfx)
      goto fail;
 
    winmm->ppwfx_size *= 2;
    winmm->ppwfx = tmp_ppwfx;
  }
 
  winmm->ppwfx[winmm->cFormats++] = pwfx;
  return TRUE;
 
fail:
  free(pwfx);
  return FALSE;
}
 
static UINT audin_winmm_open(IAudinDevice* device, AudinReceive receive, void* user_data)
{
  AudinWinmmDevice* winmm = (AudinWinmmDevice*)device;
 
  if (!winmm || !receive || !user_data)
    return ERROR_INVALID_PARAMETER;
 
  winmm->receive = receive;
  winmm->user_data = user_data;
 
  if (!(winmm->stopEvent = CreateEvent(nullptr, TRUE, FALSE, nullptr)))
  {
    WLog_Print(winmm->log, WLOG_ERROR, "CreateEvent failed!");
    return ERROR_INTERNAL_ERROR;
  }
 
  if (!(winmm->thread = CreateThread(nullptr, 0, audin_winmm_thread_func, winmm, 0, nullptr)))
  {
    WLog_Print(winmm->log, WLOG_ERROR, "CreateThread failed!");
    (void)CloseHandle(winmm->stopEvent);
    winmm->stopEvent = nullptr;
    return ERROR_INTERNAL_ERROR;
  }
 
  return CHANNEL_RC_OK;
}
 
static UINT audin_winmm_parse_addin_args(AudinWinmmDevice* device, const ADDIN_ARGV* args)
{
  int status;
  DWORD flags;
  const COMMAND_LINE_ARGUMENT_A* arg;
  AudinWinmmDevice* winmm = (AudinWinmmDevice*)device;
  COMMAND_LINE_ARGUMENT_A audin_winmm_args[] = {
    { "dev", COMMAND_LINE_VALUE_REQUIRED, "<device>", nullptr, nullptr, -1, nullptr,
      "audio device name" },
    { nullptr, 0, nullptr, nullptr, nullptr, -1, nullptr, nullptr }
  };
 
  flags =
      COMMAND_LINE_SIGIL_NONE | COMMAND_LINE_SEPARATOR_COLON | COMMAND_LINE_IGN_UNKNOWN_KEYWORD;
  status = CommandLineParseArgumentsA(args->argc, args->argv, audin_winmm_args, flags, winmm,
                                      nullptr, nullptr);
  arg = audin_winmm_args;
 
  do
  {
    if (!(arg->Flags & COMMAND_LINE_VALUE_PRESENT))
      continue;
 
    CommandLineSwitchStart(arg) CommandLineSwitchCase(arg, "dev")
    {
      winmm->device_name = _strdup(arg->Value);
 
      if (!winmm->device_name)
      {
        WLog_Print(winmm->log, WLOG_ERROR, "_strdup failed!");
        return CHANNEL_RC_NO_MEMORY;
      }
    }
    CommandLineSwitchEnd(arg)
  } while ((arg = CommandLineFindNextArgumentA(arg)) != nullptr);
 
  return CHANNEL_RC_OK;
}
 
FREERDP_ENTRY_POINT(UINT VCAPITYPE winmm_freerdp_audin_client_subsystem_entry(
    PFREERDP_AUDIN_DEVICE_ENTRY_POINTS pEntryPoints))
{
  const ADDIN_ARGV* args;
  AudinWinmmDevice* winmm;
  UINT error;
 
  if (waveInGetNumDevs() == 0)
  {
    WLog_Print(WLog_Get(TAG), WLOG_ERROR, "No microphone available!");
    return ERROR_DEVICE_NOT_AVAILABLE;
  }
 
  winmm = (AudinWinmmDevice*)calloc(1, sizeof(AudinWinmmDevice));
 
  if (!winmm)
  {
    WLog_ERR(TAG, "calloc failed!");
    return CHANNEL_RC_NO_MEMORY;
  }
 
  winmm->log = WLog_Get(TAG);
  winmm->iface.Open = audin_winmm_open;
  winmm->iface.FormatSupported = audin_winmm_format_supported;
  winmm->iface.SetFormat = audin_winmm_set_format;
  winmm->iface.Close = audin_winmm_close;
  winmm->iface.Free = audin_winmm_free;
  winmm->rdpcontext = pEntryPoints->rdpcontext;
  args = pEntryPoints->args;
 
  if ((error = audin_winmm_parse_addin_args(winmm, args)))
  {
    WLog_Print(winmm->log, WLOG_ERROR,
               "audin_winmm_parse_addin_args failed with error %" PRIu32 "!", error);
    goto error_out;
  }
 
  if (!winmm->device_name)
  {
    winmm->device_name = _strdup("default");
 
    if (!winmm->device_name)
    {
      WLog_Print(winmm->log, WLOG_ERROR, "_strdup failed!");
      error = CHANNEL_RC_NO_MEMORY;
      goto error_out;
    }
  }
 
  winmm->ppwfx_size = 10;
  winmm->ppwfx = calloc(winmm->ppwfx_size, sizeof(PWAVEFORMATEX));
 
  if (!winmm->ppwfx)
  {
    WLog_Print(winmm->log, WLOG_ERROR, "malloc failed!");
    error = CHANNEL_RC_NO_MEMORY;
    goto error_out;
  }
 
  if ((error = pEntryPoints->pRegisterAudinDevice(pEntryPoints->plugin, &winmm->iface)))
  {
    WLog_Print(winmm->log, WLOG_ERROR, "RegisterAudinDevice failed with error %" PRIu32 "!",
               error);
    goto error_out;
  }
 
  return CHANNEL_RC_OK;
error_out:
  free(winmm->ppwfx);
  free(winmm->device_name);
  free(winmm);
  return error;
}