audio.c

 
#include <freerdp/config.h>
 
#include <winpr/crt.h>
 
#include <freerdp/log.h>
#include <freerdp/codec/audio.h>
 
#define TAG FREERDP_TAG("codec")
 
UINT32 audio_format_compute_time_length(const AUDIO_FORMAT* format, size_t size)
{
  UINT32 mstime = 0;
  UINT32 wSamples = 0;
 
  if (format->wBitsPerSample)
  {
    const size_t samples = (size * 8) / format->wBitsPerSample;
    WINPR_ASSERT(samples <= UINT32_MAX);
    wSamples = (UINT32)samples;
    mstime = (((wSamples * 1000) / format->nSamplesPerSec) / format->nChannels);
  }
  else
  {
    mstime = 0;
 
    if (format->wFormatTag == WAVE_FORMAT_GSM610)
    {
      UINT16 nSamplesPerBlock = 0;
 
      if ((format->cbSize == 2) && (format->data))
      {
        nSamplesPerBlock = *((UINT16*)format->data);
        const size_t samples = (size / format->nBlockAlign) * nSamplesPerBlock;
        WINPR_ASSERT(samples <= UINT32_MAX);
        wSamples = (UINT32)samples;
        mstime = (((wSamples * 1000) / format->nSamplesPerSec) / format->nChannels);
      }
      else
      {
        WLog_ERR(TAG,
                 "audio_format_compute_time_length: invalid WAVE_FORMAT_GSM610 format");
      }
    }
    else
    {
      WLog_ERR(TAG, "audio_format_compute_time_length: unknown format %" PRIu16 "",
               format->wFormatTag);
    }
  }
 
  return mstime;
}
 
const char* audio_format_get_tag_string(UINT16 wFormatTag)
{
  switch (wFormatTag)
  {
    case WAVE_FORMAT_PCM:
      return "WAVE_FORMAT_PCM";
 
    case WAVE_FORMAT_ADPCM:
      return "WAVE_FORMAT_ADPCM";
 
    case WAVE_FORMAT_ALAW:
      return "WAVE_FORMAT_ALAW";
 
    case WAVE_FORMAT_MULAW:
      return "WAVE_FORMAT_MULAW";
 
    case WAVE_FORMAT_DVI_ADPCM:
      return "WAVE_FORMAT_DVI_ADPCM";
 
    case WAVE_FORMAT_GSM610:
      return "WAVE_FORMAT_GSM610";
 
    case WAVE_FORMAT_MSG723:
      return "WAVE_FORMAT_MSG723";
 
    case WAVE_FORMAT_DSPGROUP_TRUESPEECH:
      return "WAVE_FORMAT_DSPGROUP_TRUESPEECH ";
 
    case WAVE_FORMAT_MPEGLAYER3:
      return "WAVE_FORMAT_MPEGLAYER3";
 
    case WAVE_FORMAT_WMAUDIO2:
      return "WAVE_FORMAT_WMAUDIO2";
 
    case WAVE_FORMAT_AAC_MS:
      return "WAVE_FORMAT_AAC_MS";
    default:
      return "WAVE_FORMAT_UNKNOWN";
  }
}
 
void audio_format_print(wLog* log, DWORD level, const AUDIO_FORMAT* format)
{
  WLog_Print(log, level,
             "%s:\t wFormatTag: 0x%04" PRIX16 " nChannels: %" PRIu16 " nSamplesPerSec: %" PRIu32
             " "
             "nAvgBytesPerSec: %" PRIu32 " nBlockAlign: %" PRIu16 " wBitsPerSample: %" PRIu16
             " cbSize: %" PRIu16 "",
             audio_format_get_tag_string(format->wFormatTag), format->wFormatTag,
             format->nChannels, format->nSamplesPerSec, format->nAvgBytesPerSec,
             format->nBlockAlign, format->wBitsPerSample, format->cbSize);
}
 
void audio_formats_print(wLog* log, DWORD level, const AUDIO_FORMAT* formats, UINT16 count)
{
  if (formats)
  {
    WLog_Print(log, level, "AUDIO_FORMATS (%" PRIu16 ") ={", count);
 
    for (UINT32 index = 0; index < count; index++)
    {
      const AUDIO_FORMAT* format = &formats[index];
      WLog_Print(log, level, "\t");
      audio_format_print(log, level, format);
    }
 
    WLog_Print(log, level, "}");
  }
}
 
BOOL audio_format_read(wStream* s, AUDIO_FORMAT* format)
{
  if (!s || !format)
    return FALSE;
 
  if (!Stream_CheckAndLogRequiredLength(TAG, s, 18))
    return FALSE;
 
  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 (!Stream_CheckAndLogRequiredLength(TAG, s, format->cbSize))
    return FALSE;
 
  format->data = NULL;
 
  if (format->cbSize > 0)
  {
    format->data = malloc(format->cbSize);
 
    if (!format->data)
      return FALSE;
 
    Stream_Read(s, format->data, format->cbSize);
  }
 
  return TRUE;
}
 
BOOL audio_format_write(wStream* s, const AUDIO_FORMAT* format)
{
  if (!s || !format)
    return FALSE;
 
  if (!Stream_EnsureRemainingCapacity(s, 18 + format->cbSize))
    return FALSE;
 
  Stream_Write_UINT16(s, format->wFormatTag);      /* wFormatTag (WAVE_FORMAT_PCM) */
  Stream_Write_UINT16(s, format->nChannels);       /* nChannels */
  Stream_Write_UINT32(s, format->nSamplesPerSec);  /* nSamplesPerSec */
  Stream_Write_UINT32(s, format->nAvgBytesPerSec); /* nAvgBytesPerSec */
  Stream_Write_UINT16(s, format->nBlockAlign);     /* nBlockAlign */
  Stream_Write_UINT16(s, format->wBitsPerSample);  /* wBitsPerSample */
  Stream_Write_UINT16(s, format->cbSize);          /* cbSize */
 
  if (format->cbSize > 0)
    Stream_Write(s, format->data, format->cbSize);
 
  return TRUE;
}
 
BOOL audio_format_copy(const AUDIO_FORMAT* WINPR_RESTRICT srcFormat,
                       AUDIO_FORMAT* WINPR_RESTRICT dstFormat)
{
  if (!srcFormat || !dstFormat)
    return FALSE;
 
  *dstFormat = *srcFormat;
 
  if (srcFormat->cbSize > 0)
  {
    dstFormat->data = malloc(srcFormat->cbSize);
 
    if (!dstFormat->data)
      return FALSE;
 
    memcpy(dstFormat->data, srcFormat->data, dstFormat->cbSize);
  }
 
  return TRUE;
}
 
BOOL audio_format_compatible(const AUDIO_FORMAT* with, const AUDIO_FORMAT* what)
{
  if (!with || !what)
    return FALSE;
 
  if (with->wFormatTag != WAVE_FORMAT_UNKNOWN)
  {
    if (with->wFormatTag != what->wFormatTag)
      return FALSE;
  }
 
  if (with->nChannels != 0)
  {
    if (with->nChannels != what->nChannels)
      return FALSE;
  }
 
  if (with->nSamplesPerSec != 0)
  {
    if (with->nSamplesPerSec != what->nSamplesPerSec)
      return FALSE;
  }
 
  if (with->wBitsPerSample != 0)
  {
    if (with->wBitsPerSample != what->wBitsPerSample)
      return FALSE;
  }
 
  return TRUE;
}
 
AUDIO_FORMAT* audio_format_new(void)
{
  return audio_formats_new(1);
}
 
AUDIO_FORMAT* audio_formats_new(size_t count)
{
  return calloc(count, sizeof(AUDIO_FORMAT));
}
 
void audio_format_free(AUDIO_FORMAT* format)
{
  if (format)
    free(format->data);
}
 
void audio_formats_free(AUDIO_FORMAT* formats, size_t count)
{
  if (formats)
  {
    for (size_t index = 0; index < count; index++)
    {
      AUDIO_FORMAT* format = &formats[index];
      audio_format_free(format);
    }
 
    free(formats);
  }
}