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#include "MP3Coder.h"
AudioCoderMP3::~AudioCoderMP3()
{
if (hbeStream) beCloseStream(hbeStream); hbeStream = 0;
if (bs) free(bs); bs = 0;
}
int AudioCoderMP3::GetLastError() { return m_err; };
void AudioCoderMP3::setVbrFilename(char *filename)
{
if (hbeStream) beCloseStream(hbeStream);
hbeStream = 0;
if (filename)
{
beWriteVBRHeader(filename);
}
}
int AudioCoderMP3::Encode(int framepos, void *in, int in_avail, int *in_used, void *out, int out_avail)
{
if (m_err) return -1;
if (!hbeStream)
{
if (beInitStream(&beConfig, &ibuf_size_spls, &obuf_size, (PHBE_STREAM) &hbeStream) != BE_ERR_SUCCESSFUL)
{
m_err++;
return -1;
}
ibuf_size = ibuf_size_spls * bytesPerSample;
if (is_downmix) ibuf_size *= 2;
bs = (char*)malloc(ibuf_size);
bs_size = 0;
}
*in_used = 0;
int needbytes = ibuf_size - bs_size;
if (needbytes > 0 && in_avail > 0)
{
if (needbytes > in_avail)
needbytes = in_avail;
memcpy(bs + bs_size, in, needbytes);
bs_size += needbytes;
*in_used = needbytes;
}
if (!done)
{
if (bs_size < (int)ibuf_size) return 0;
}
if (out_avail < (int)obuf_size) return 0;
int feedBytes = min(bs_size, (int)ibuf_size);
int feedSamples = feedBytes / bytesPerSample;
bs_size -= feedBytes;
if (is_downmix)
{
int x;
int l = feedBytes / 4;
short *b = (short*)bs;
for (x = 0; x < l; x ++)
{
b[x] = b[x * 2] / 2 + b[x * 2 + 1] / 2;
}
feedSamples/=2;
}
DWORD dwo = 0;
if (feedSamples)
{
if (beEncodeChunk(hbeStream, feedSamples, (short*)bs, (unsigned char*)out, &dwo) != BE_ERR_SUCCESSFUL)
{
m_err++;
return -1;
}
}
if (!dwo && done==1)
{
if (beDeinitStream(hbeStream, (unsigned char *)out, &dwo) != BE_ERR_SUCCESSFUL)
{
m_err++;
return -1;
}
done++;
}
return dwo;
}
void AudioCoderMP3::PrepareToFinish()
{
done = 1;
}
AudioCoderMP3::AudioCoderMP3(int nch, int srate, int bps, configtype *cfg)
: obuf_size(0), ibuf_size(0), ibuf_size_spls(0), done(false), bs_size(0)
{
m_err = 0;
hbeStream = 0;
bs = 0;
is_downmix = 0;
mono_input=0;
memset(&beConfig, 0, sizeof(beConfig)); // clear all fields
if (srate != 32000
&& srate != 44100
&& srate != 48000
&& srate != 16000 /* MPEG 2 sample rates */
&& srate != 22050
&& srate != 24000
&& srate != 11025 /* MPEG 2.5 sample rates */
&& srate != 12000
&& srate != 8000)
{
//MessageBox(NULL, "The only valid audio sampling rates for the LAME mp3 encoder are:\r\t16000\r\t22050\r\t24000\r\t32000\r\t44100\r\t48000\r\rPlease modify the encoding profile to use one of these sampling rates, and then try again.", "Invalid sampling rate", MB_OK);
m_err++;
return ;
}
// use the LAME config structure
beConfig.dwConfig = BE_CONFIG_LAME;
// this are the default settings for testcase.wav
beConfig.format.LHV1.dwStructVersion = 1;
beConfig.format.LHV1.dwStructSize = sizeof(beConfig);
beConfig.format.LHV1.dwSampleRate = srate; // INPUT FREQUENCY
beConfig.format.LHV1.nMode = cfg->stereo_mode;
if (nch < 2)
{
beConfig.format.LHV1.nMode = BE_MP3_MODE_MONO;
mono_input=1;
}
else
{
if (beConfig.format.LHV1.nMode == BE_MP3_MODE_MONO)
is_downmix = 1;
// beConfig.format.LHV1.nMode = BE_MP3_MODE_STEREO;
}
beConfig.format.LHV1.dwBitrate = cfg->bitrate;
beConfig.format.LHV1.dwMaxBitrate = (cfg->vbr_method != -1 ? cfg->vbr_max_bitrate : cfg->bitrate);
beConfig.format.LHV1.dwReSampleRate = 0; // DOWNSAMPLERATE, 0=ENCODER DECIDES
if (beConfig.format.LHV1.dwMaxBitrate < 32) // less than 32, let's force mono
{
if (nch > 1)
{
beConfig.format.LHV1.nMode = BE_MP3_MODE_MONO;
is_downmix = 1;
}
}
/*int effective_nch = (beConfig.format.LHV1.nMode == BE_MP3_MODE_MONO) ? 1 : 2;
if (beConfig.format.LHV1.dwReSampleRate >= 32000 &&
beConfig.format.LHV1.dwMaxBitrate / effective_nch <= 32)
{
beConfig.format.LHV1.dwReSampleRate /= 2;
}*/
/*
if (beConfig.format.LHV1.dwReSampleRate < 32000)
beConfig.format.LHV1.dwMpegVersion = MPEG2; // MPEG VERSION (I or II)
else
beConfig.format.LHV1.dwMpegVersion = MPEG1; // MPEG VERSION (I or II)
*/
beConfig.format.LHV1.nPreset = cfg->quality;
beConfig.format.LHV1.dwPsyModel = 0; // USE DEFAULT PSYCHOACOUSTIC MODEL
beConfig.format.LHV1.dwEmphasis = 0; // NO EMPHASIS TURNED ON
beConfig.format.LHV1.bOriginal = 0; // SET ORIGINAL FLAG
beConfig.format.LHV1.bCRC = 0; // INSERT CRC
beConfig.format.LHV1.bCopyright = 0; // SET COPYRIGHT FLAG
beConfig.format.LHV1.bPrivate = 0; // SET PRIVATE FLAG
beConfig.format.LHV1.bNoRes = 0;
beConfig.format.LHV1.bWriteVBRHeader = 1;
beConfig.format.LHV1.bEnableVBR = cfg->vbr_method != VBR_METHOD_NONE;
beConfig.format.LHV1.nVBRQuality = cfg->vbr;
//beConfig.format.LHV1.dwVbrAbr_bps = (cfg->vbr_method != VBR_METHOD_NONE ? 1000 * cfg->abr_bitrate : 0);
beConfig.format.LHV1.dwVbrAbr_bps = (cfg->vbr_method == VBR_METHOD_ABR ? 1000 * cfg->abr_bitrate : 0);
beConfig.format.LHV1.nVbrMethod = (VBRMETHOD)cfg->vbr_method;
bytesPerSample = bps / 8;
}
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