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ACMStream.cpp

/**
 *
 * Lame ACM wrapper, encode/decode MP3 based RIFF/AVI files in MS Windows
 *
 *  Copyright (c) 2002 Steve Lhomme <steve.lhomme at free.fr>
 *
 * This library 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 library 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 library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */
 
/*!
      \author Steve Lhomme
      \version \$Id: ACMStream.cpp,v 1.12.2.1 2008/11/01 20:41:47 robert Exp $
*/

#if !defined(STRICT)
#define STRICT
#endif // STRICT

#include <assert.h>
#include <windows.h>

#include "adebug.h"

#include "ACMStream.h"

#include <lame.h>

// static methods

ACMStream * ACMStream::Create()
{
      ACMStream * Result;

      Result = new ACMStream;

      return Result;
}

const bool ACMStream::Erase(const ACMStream * a_ACMStream)
{
      delete a_ACMStream;
      return true;
}

// class methods

00060 ACMStream::ACMStream() :
 m_WorkingBufferUseSize(0),
 gfp(NULL)
{
       /// \todo get the debug level from the registry
my_debug = new ADbg(DEBUG_LEVEL_CREATION);
      if (my_debug != NULL) {
            unsigned char DebugFileName[512];

            my_debug->setPrefix("LAMEstream"); /// \todo get it from the registry
my_debug->setIncludeTime(true);  /// \todo get it from the registry

// Check in the registry if we have to Output Debug information
DebugFileName[0] = '\0';

            HKEY OssKey;
            if (RegOpenKeyEx( HKEY_LOCAL_MACHINE, "SOFTWARE\\MUKOLI", 0, KEY_READ , &OssKey ) == ERROR_SUCCESS) {
                  DWORD DataType;
                  DWORD DebugFileNameSize = 512;
                  if (RegQueryValueEx( OssKey, "DebugFile", NULL, &DataType, DebugFileName, &DebugFileNameSize ) == ERROR_SUCCESS) {
                        if (DataType == REG_SZ) {
                              my_debug->setUseFile(true);
                              my_debug->setDebugFile((char *)DebugFileName);
                              my_debug->OutPut("Debug file is %s",(char *)DebugFileName);
                        }
                  }
            }
            my_debug->OutPut(DEBUG_LEVEL_FUNC_START, "ACMStream Creation (0X%08X)",this);
      }
      else {
            ADbg debug;
            debug.OutPut("ACMStream::ACMACMStream : Impossible to create my_debug");
      }

}

ACMStream::~ACMStream()
{
        // release memory - encoding is finished
      if (gfp) lame_close( gfp );

      if (my_debug != NULL)
      {
            my_debug->OutPut(DEBUG_LEVEL_FUNC_START, "ACMStream Deletion (0X%08X)",this);
            delete my_debug;
      }
}

bool ACMStream::init(const int nSamplesPerSec, const int nOutputSamplesPerSec, const int nChannels, const int nAvgBytesPerSec, const vbr_mode mode)
{
      bool bResult = false;

      my_SamplesPerSec  = nSamplesPerSec;
      my_OutBytesPerSec = nOutputSamplesPerSec;
      my_Channels       = nChannels;
      my_AvgBytesPerSec = nAvgBytesPerSec;
      my_VBRMode = mode;

      bResult = true;

      return bResult;

}

00124 bool ACMStream::open(const AEncodeProperties & the_Properties)
{
      bool bResult = false;

      // Init the MP3 Stream
      // Init the global flags structure
      gfp = lame_init();

      // Set input sample frequency
      lame_set_in_samplerate( gfp, my_SamplesPerSec );

      // Set output sample frequency
      lame_set_out_samplerate( gfp, my_OutBytesPerSec );

      lame_set_num_channels( gfp, my_Channels );
      if (my_Channels == 1)
            lame_set_mode( gfp, MONO );
      else
            lame_set_mode( gfp, (MPEG_mode_e)the_Properties.GetChannelModeValue()) ; /// \todo Get the mode from the default configuration

//    lame_set_VBR( gfp, vbr_off ); /// \note VBR not supported for the moment
      lame_set_VBR( gfp, my_VBRMode ); /// \note VBR not supported for the moment
      
      if (my_VBRMode == vbr_abr)
      {
            lame_set_VBR_q( gfp, 1 );

            lame_set_VBR_mean_bitrate_kbps( gfp, (my_AvgBytesPerSec * 8 + 500) / 1000 );

            if (24000 > lame_get_in_samplerate( gfp ))
            {
                  // For MPEG-II
                  lame_set_VBR_min_bitrate_kbps( gfp, 8);

                  lame_set_VBR_max_bitrate_kbps( gfp, 160);
            }
            else
            {
                  // For MPEG-I
                  lame_set_VBR_min_bitrate_kbps( gfp, 32);

                  lame_set_VBR_max_bitrate_kbps( gfp, 320);
            }
      }

      // Set bitrate
      lame_set_brate( gfp, my_AvgBytesPerSec * 8 / 1000 );

      /// \todo Get the mode from the default configuration
      // Set copyright flag?
      lame_set_copyright( gfp, the_Properties.GetCopyrightMode()?1:0 );
      // Do we have to tag  it as non original 
      lame_set_original( gfp, the_Properties.GetOriginalMode()?1:0 );
      // Add CRC?
      lame_set_error_protection( gfp, the_Properties.GetCRCMode()?1:0 );
      // Set private bit?
      lame_set_extension( gfp, the_Properties.GetPrivateMode()?1:0 );
      // INFO tag support not possible in ACM - it requires rewinding 
        // output stream to the beginning after encoding is finished.   
      lame_set_bWriteVbrTag( gfp, 0 );

      if (0 == lame_init_params( gfp ))
      {
            //LAME encoding call will accept any number of samples.  
            if ( 0 == lame_get_version( gfp ) )
            {
                  // For MPEG-II, only 576 samples per frame per channel
                  my_SamplesPerBlock = 576 * lame_get_num_channels( gfp );
            }
            else
            {
                  // For MPEG-I, 1152 samples per frame per channel
                  my_SamplesPerBlock = 1152 * lame_get_num_channels( gfp );
            }
      }

      my_debug->OutPut(DEBUG_LEVEL_FUNC_DEBUG, "version                =%d",lame_get_version( gfp ) );
      my_debug->OutPut(DEBUG_LEVEL_FUNC_DEBUG, "Layer                  =3");
      switch ( lame_get_mode( gfp ) )
      {
            case STEREO:       my_debug->OutPut(DEBUG_LEVEL_FUNC_DEBUG,  "mode                   =Stereo" ); break;
            case JOINT_STEREO: my_debug->OutPut(DEBUG_LEVEL_FUNC_DEBUG,  "mode                   =Joint-Stereo" ); break;
            case DUAL_CHANNEL: my_debug->OutPut(DEBUG_LEVEL_FUNC_DEBUG,  "mode                   =Forced Stereo" ); break;
            case MONO:         my_debug->OutPut(DEBUG_LEVEL_FUNC_DEBUG,  "mode                   =Mono" ); break;
            case NOT_SET:      /* FALLTROUGH */
            default:           my_debug->OutPut(DEBUG_LEVEL_FUNC_DEBUG,  "mode                   =Error (unknown)" ); break;
      }

      my_debug->OutPut(DEBUG_LEVEL_FUNC_DEBUG, "sampling frequency     =%.1f kHz", lame_get_in_samplerate( gfp ) /1000.0 );
      my_debug->OutPut(DEBUG_LEVEL_FUNC_DEBUG, "bitrate                =%d kbps", lame_get_brate( gfp ) );
      my_debug->OutPut(DEBUG_LEVEL_FUNC_DEBUG, "Vbr Min bitrate        =%d kbps", lame_get_VBR_min_bitrate_kbps( gfp ) );
      my_debug->OutPut(DEBUG_LEVEL_FUNC_DEBUG, "Vbr Max bitrate        =%d kbps", lame_get_VBR_max_bitrate_kbps( gfp ) );
      my_debug->OutPut(DEBUG_LEVEL_FUNC_DEBUG, "Quality Setting        =%d", lame_get_quality( gfp ) );

      my_debug->OutPut(DEBUG_LEVEL_FUNC_DEBUG, "Low pass frequency     =%d", lame_get_lowpassfreq( gfp ) );
      my_debug->OutPut(DEBUG_LEVEL_FUNC_DEBUG, "Low pass width         =%d", lame_get_lowpasswidth( gfp ) );

      my_debug->OutPut(DEBUG_LEVEL_FUNC_DEBUG, "High pass frequency    =%d", lame_get_highpassfreq( gfp ) );
      my_debug->OutPut(DEBUG_LEVEL_FUNC_DEBUG, "High pass width        =%d", lame_get_highpasswidth( gfp ) );

      my_debug->OutPut(DEBUG_LEVEL_FUNC_DEBUG, "No Short Blocks        =%d", lame_get_no_short_blocks( gfp ) );

      my_debug->OutPut(DEBUG_LEVEL_FUNC_DEBUG, "de-emphasis            =%d", lame_get_emphasis( gfp ) );
      my_debug->OutPut(DEBUG_LEVEL_FUNC_DEBUG, "private flag           =%d", lame_get_extension( gfp ) );

      my_debug->OutPut(DEBUG_LEVEL_FUNC_DEBUG, "copyright flag         =%d", lame_get_copyright( gfp ) );
      my_debug->OutPut(DEBUG_LEVEL_FUNC_DEBUG, "original flag          =%d",  lame_get_original( gfp ) );
      my_debug->OutPut(DEBUG_LEVEL_FUNC_DEBUG, "CRC                    =%s", lame_get_error_protection( gfp ) ? "on" : "off" );
      my_debug->OutPut(DEBUG_LEVEL_FUNC_DEBUG, "Fast mode              =%s", ( lame_get_quality( gfp ) )? "enabled" : "disabled" );
      my_debug->OutPut(DEBUG_LEVEL_FUNC_DEBUG, "Force mid/side stereo  =%s", ( lame_get_force_ms( gfp ) )?"enabled":"disabled" );
      my_debug->OutPut(DEBUG_LEVEL_FUNC_DEBUG, "Disable Resorvoir      =%d", lame_get_disable_reservoir( gfp ) );
      my_debug->OutPut(DEBUG_LEVEL_FUNC_DEBUG, "VBR                    =%s, VBR_q =%d, VBR method =",
                              ( lame_get_VBR( gfp ) !=vbr_off ) ? "enabled": "disabled",
                        lame_get_VBR_q( gfp ) );

      switch ( lame_get_VBR( gfp ) )
      {
            case vbr_off:     my_debug->OutPut(DEBUG_LEVEL_FUNC_DEBUG,  "vbr_off" );      break;
            case vbr_mt :     my_debug->OutPut(DEBUG_LEVEL_FUNC_DEBUG,  "vbr_mt" ); break;
            case vbr_rh :     my_debug->OutPut(DEBUG_LEVEL_FUNC_DEBUG,  "vbr_rh" ); break;
            case vbr_mtrh:    my_debug->OutPut(DEBUG_LEVEL_FUNC_DEBUG,  "vbr_mtrh" );     break;
            case vbr_abr: 
                  my_debug->OutPut(DEBUG_LEVEL_FUNC_DEBUG,  "vbr_abr (average bitrate %d kbps)", lame_get_VBR_mean_bitrate_kbps( gfp ) );
            break;
            default:
                  my_debug->OutPut(DEBUG_LEVEL_FUNC_DEBUG, "error, unknown VBR setting");
            break;
      }

      my_debug->OutPut(DEBUG_LEVEL_FUNC_DEBUG, "Write VBR Header       =%s\n", ( lame_get_bWriteVbrTag( gfp ) ) ?"Yes":"No");

#ifdef FROM_DLL
beConfig.format.LHV1.dwReSampleRate       = my_OutBytesPerSec;      // force the user resampling
#endif // FROM_DLL

      bResult = true;

      return bResult;
}

bool ACMStream::close(LPBYTE pOutputBuffer, DWORD *pOutputSize)
{

bool bResult = false;

      int nOutputSamples = 0;

    nOutputSamples = lame_encode_flush( gfp, pOutputBuffer, 0 );

      if ( nOutputSamples < 0 )
      {
            // BUFFER_TOO_SMALL
*pOutputSize = 0;
      }
      else
{
            *pOutputSize = nOutputSamples;

            bResult = true;
      }

      // lame will be closed in destructor
        //lame_close( gfp );

      return bResult;
}

DWORD ACMStream::GetOutputSizeForInput(const DWORD the_SrcLength) const
{
/*    double OutputInputRatio;

      if (my_VBRMode == vbr_off)
            OutputInputRatio = double(my_AvgBytesPerSec) / double(my_OutBytesPerSec * 2);
      else // reserve the space for 320 kbps
            OutputInputRatio = 40000.0 / double(my_OutBytesPerSec * 2);

      OutputInputRatio *= 1.15; // allow 15% more*/

    DWORD Result;

//    Result = DWORD(double(the_SrcLength) * OutputInputRatio);
    Result = DWORD(1.25*the_SrcLength + 7200);

my_debug->OutPut(DEBUG_LEVEL_FUNC_CODE, "Result = %d",Result);

      return Result;
}

bool ACMStream::ConvertBuffer(LPACMDRVSTREAMHEADER a_StreamHeader)
{
      bool result;

if (my_debug != NULL)
{
my_debug->OutPut(DEBUG_LEVEL_FUNC_DEBUG, "enter ACMStream::ConvertBuffer");
}

      DWORD InSize = a_StreamHeader->cbSrcLength / 2, OutSize = a_StreamHeader->cbDstLength; // 2 for 8<->16 bits

// Encode it
int dwSamples;
      int nOutputSamples = 0;

      dwSamples = InSize / lame_get_num_channels( gfp );

      if ( 1 == lame_get_num_channels( gfp ) )
      {
            nOutputSamples = lame_encode_buffer(gfp,(PSHORT)a_StreamHeader->pbSrc,(PSHORT)a_StreamHeader->pbSrc,dwSamples,a_StreamHeader->pbDst,a_StreamHeader->cbDstLength);
      }
      else
      {
            nOutputSamples = lame_encode_buffer_interleaved(gfp,(PSHORT)a_StreamHeader->pbSrc,dwSamples,a_StreamHeader->pbDst,a_StreamHeader->cbDstLength);
      }

      a_StreamHeader->cbSrcLengthUsed = a_StreamHeader->cbSrcLength;
      a_StreamHeader->cbDstLengthUsed = nOutputSamples;

      result = a_StreamHeader->cbDstLengthUsed <= a_StreamHeader->cbDstLength;

      my_debug->OutPut(DEBUG_LEVEL_FUNC_CODE, "UsedSize = %d / EncodedSize = %d, result = %d (%d <= %d)", InSize, OutSize, result, a_StreamHeader->cbDstLengthUsed, a_StreamHeader->cbDstLength);

if (my_debug != NULL)
{
my_debug->OutPut(DEBUG_LEVEL_FUNC_DEBUG, "ACMStream::ConvertBuffer result = %d (0x%02X 0x%02X)",result,a_StreamHeader->pbDst[0],a_StreamHeader->pbDst[1]);
}

      return result;
}

/* map frequency to a valid MP3 sample frequency
 *
 * Robert Hegemann 2000-07-01
 */
static int
map2MP3Frequency(int freq)
{
    if (freq <= 8000)
        return 8000;
    if (freq <= 11025)
        return 11025;
    if (freq <= 12000)
        return 12000;
    if (freq <= 16000)
        return 16000;
    if (freq <= 22050)
        return 22050;
    if (freq <= 24000)
        return 24000;
    if (freq <= 32000)
        return 32000;
    if (freq <= 44100)
        return 44100;

    return 48000;
}


00381 unsigned int ACMStream::GetOutputSampleRate(int samples_per_sec, int bitrate, int channels)
{
    if (bitrate==0)
        bitrate = (64000*channels)/8;
  
        /// \todo pass through the same LAME routine
      unsigned int OutputFrequency;
      double compression_ratio = double(samples_per_sec * 16 * channels / (bitrate * 8));
      if (compression_ratio > 13.)
            OutputFrequency = map2MP3Frequency( int((10. * bitrate * 8) / (16 * channels)));
      else
            OutputFrequency = map2MP3Frequency( int(0.97 * samples_per_sec) );

      return OutputFrequency;

}


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