private Stream OpenSndFile(LameGlobalFlags gfp, Stream mp3Stream, Enc enc)
{
gfp.num_samples = -1;
musicin = mp3Stream;
if (is_mpeg_file_format(parse.input_format))
{
if (-1 == lame_decode_initfile(musicin, parse.mp3input_data, enc))
{
throw new Exception(string.Format("Error reading headers in mp3 input file {0}.", mp3Stream));
}
gfp.num_channels = parse.mp3input_data.stereo;
gfp.in_samplerate = parse.mp3input_data.samplerate;
gfp.num_samples = parse.mp3input_data.nsamp;
}
else if (parse.input_format == sound_file_format.sf_ogg)
{
throw new Exception("sorry, vorbis support in LAME is deprecated.");
}
else if (parse.input_format == sound_file_format.sf_raw)
{
pcmswapbytes = parse.swapbytes;
}
else
{
parse.input_format = parse_file_header(gfp, musicin);
}
if (parse.input_format == sound_file_format.sf_unknown)
{
throw new Exception("Unknown sound format!");
}
if (gfp.num_samples == -1)
{
double flen = musicin.Length;
if (flen >= 0)
{
if (is_mpeg_file_format(parse.input_format))
{
if (parse.mp3input_data.bitrate > 0)
{
var totalseconds = flen * 8.0 / (1000.0 * parse.mp3input_data.bitrate);
var tmp_num_samples = (int)(totalseconds * gfp.in_samplerate);
gfp.num_samples = tmp_num_samples;
parse.mp3input_data.nsamp = tmp_num_samples;
}
}
else
{
gfp.num_samples = (int)(flen / (2 * gfp.num_channels));
}
}
}
return(musicin);
}
internal void init_infile(LameGlobalFlags gfp, Stream mp3Stream, Enc enc)
{
count_samples_carefully = false;
num_samples_read = 0;
pcmbitwidth = parse.in_bitwidth;
pcmswapbytes = parse.swapbytes;
pcm_is_unsigned_8bit = !parse.in_signed;
musicin = OpenSndFile(gfp, mp3Stream, enc);
}
private FileStream OpenSndFile(LameGlobalFlags gfp, string inPath, Enc enc)
{
gfp.num_samples = -1;
try
{
musicin = new FileStream(inPath, FileMode.Open, FileAccess.Read);
}
catch (FileNotFoundException e)
{
throw new Exception(string.Format("Could not find \"{0}\".", inPath), e);
}
if (is_mpeg_file_format(parse.input_format))
{
if (-1 == lame_decode_initfile(musicin, parse.mp3input_data, enc))
{
throw new Exception(string.Format("Error reading headers in mp3 input file {0}.", inPath));
}
gfp.num_channels = parse.mp3input_data.stereo;
gfp.in_samplerate = parse.mp3input_data.samplerate;
gfp.num_samples = parse.mp3input_data.nsamp;
}
else if (parse.input_format == sound_file_format.sf_ogg)
{
throw new Exception("sorry, vorbis support in LAME is deprecated.");
}
else if (parse.input_format == sound_file_format.sf_raw)
{
if (parse.silent < 10)
{
Console.WriteLine("Assuming raw pcm input file");
if (parse.swapbytes)
{
Console.Write(" : Forcing byte-swapping\n");
}
else
{
Console.Write("\n");
}
}
pcmswapbytes = parse.swapbytes;
}
else
{
parse.input_format = parse_file_header(gfp, musicin);
}
if (parse.input_format == sound_file_format.sf_unknown)
{
throw new Exception("Unknown sound format!");
}
if (gfp.num_samples == -1)
{
double flen = musicin.Length;
if (flen >= 0)
{
if (is_mpeg_file_format(parse.input_format))
{
if (parse.mp3input_data.bitrate > 0)
{
var totalseconds = flen * 8.0 / (1000.0 * parse.mp3input_data.bitrate);
var tmp_num_samples = (int)(totalseconds * gfp.in_samplerate);
gfp.num_samples = tmp_num_samples;
parse.mp3input_data.nsamp = tmp_num_samples;
}
}
else
{
gfp.num_samples = (int)(flen / (2 * gfp.num_channels));
}
}
}
return(musicin);
}
private int lame_decode_initfile(Stream fd, MP3Data mp3data, Enc enc)
{
var buf = new byte[100];
var pcm_l = new short[1152];
var pcm_r = new short[1152];
var freeformat = false;
if (hip != null)
{
mpg.hip_decode_exit(hip);
}
hip = mpg.hip_decode_init();
var len = 4;
if (fd.Position + len > fd.Length)
{
return(-1);
}
fd.Read(buf, 0, len);
if (buf[0] == (sbyte)'I' && buf[1] == (sbyte)'D' && buf[2] == (sbyte)'3')
{
len = 6;
try
{
fd.Read(buf, 0, len);
}
catch (IOException e)
{
return(-1);
}
buf[2] &= 127;
buf[3] &= 127;
buf[4] &= 127;
buf[5] &= 127;
len = (((((buf[2] << 7) + buf[3]) << 7) + buf[4]) << 7) + buf[5];
try
{
fd.Seek(len, SeekOrigin.Current);
}
catch (IOException e)
{
return(-1);
}
len = 4;
try
{
fd.Read(buf, 0, len);
}
catch (IOException e)
{
return(-1);
}
}
if (check_aid(buf))
{
try
{
fd.Read(buf, 0, 2);
}
catch (IOException e)
{
return(-1);
}
var aid_header = (buf[0] & 0xff) + 256 * (buf[1] & 0xff);
try
{
fd.Seek(aid_header - 6, SeekOrigin.Current);
}
catch (IOException e)
{
return(-1);
}
try
{
fd.Read(buf, 0, len);
}
catch (IOException e)
{
return(-1);
}
}
len = 4;
while (!is_syncword_mp123(buf))
{
int i;
for (i = 0; i < len - 1; i++)
{
buf[i] = buf[i + 1];
}
try
{
fd.Read(buf, len - 1, 1);
}
catch (IOException e)
{
return(-1);
}
}
if ((buf[2] & 0xf0) == 0)
{
freeformat = true;
}
var ret = mpg.hip_decode1_headersB(hip, buf, len, pcm_l, pcm_r, mp3data, enc, false);
if (-1 == ret)
{
return(-1);
}
while (!mp3data.header_parsed)
{
try
{
fd.Read(buf, 0, buf.Length);
}
catch (IOException e)
{
return(-1);
}
ret = mpg.hip_decode1_headersB(hip, buf, buf.Length, pcm_l, pcm_r, mp3data, enc, false);
if (-1 == ret)
{
return(-1);
}
}
if (mp3data.bitrate == 0 && !freeformat)
{
return(lame_decode_initfile(fd, mp3data, enc));
}
if (mp3data.totalframes > 0)
{
}
else
{
mp3data.nsamp = -1;
}
return(0);
}
private int lame_decode_initfile(FileStream fd, MP3Data mp3data, Enc enc)
{
var buf = new byte[100];
var pcm_l = new short[1152];
var pcm_r = new short[1152];
var freeformat = false;
if (hip != null)
{
mpg.hip_decode_exit(hip);
}
hip = mpg.hip_decode_init();
var len = 4;
try
{
fd.Read(buf, 0, len);
}
catch (IOException e)
{
Console.WriteLine(e.ToString());
Console.Write(e.StackTrace);
return(-1);
}
if (buf[0] == (sbyte)'I' && buf[1] == (sbyte)'D' && buf[2] == (sbyte)'3')
{
if (parse.silent < 10)
{
Console.WriteLine(
"ID3v2 found. " + "Be aware that the ID3 tag is currently lost when transcoding.");
}
len = 6;
try
{
fd.Read(buf, 0, len);
}
catch (IOException e)
{
Console.WriteLine(e.ToString());
Console.Write(e.StackTrace);
return(-1);
}
buf[2] &= 127;
buf[3] &= 127;
buf[4] &= 127;
buf[5] &= 127;
len = (((((buf[2] << 7) + buf[3]) << 7) + buf[4]) << 7) + buf[5];
try
{
fd.Seek(len, SeekOrigin.Current);
}
catch (IOException e)
{
Console.WriteLine(e.ToString());
Console.Write(e.StackTrace);
return(-1);
}
len = 4;
try
{
fd.Read(buf, 0, len);
}
catch (IOException e)
{
Console.WriteLine(e.ToString());
Console.Write(e.StackTrace);
return(-1);
}
}
if (check_aid(buf))
{
try
{
fd.Read(buf, 0, 2);
}
catch (IOException e)
{
Console.WriteLine(e.ToString());
Console.Write(e.StackTrace);
return(-1);
}
var aid_header = (buf[0] & 0xff) + 256 * (buf[1] & 0xff);
if (parse.silent < 10)
{
Console.Write("Album ID found. length={0:D} \n", aid_header);
}
try
{
fd.Seek(aid_header - 6, SeekOrigin.Current);
}
catch (IOException e)
{
Console.WriteLine(e.ToString());
Console.Write(e.StackTrace);
return(-1);
}
try
{
fd.Read(buf, 0, len);
}
catch (IOException e)
{
Console.WriteLine(e.ToString());
Console.Write(e.StackTrace);
return(-1);
}
}
len = 4;
while (!is_syncword_mp123(buf))
{
int i;
for (i = 0; i < len - 1; i++)
{
buf[i] = buf[i + 1];
}
try
{
fd.Read(buf, len - 1, 1);
}
catch (IOException e)
{
Console.WriteLine(e.ToString());
Console.Write(e.StackTrace);
return(-1);
}
}
if ((buf[2] & 0xf0) == 0)
{
if (parse.silent < 10)
{
Console.WriteLine("Input file is freeformat.");
}
freeformat = true;
}
var ret = mpg.hip_decode1_headersB(hip, buf, len, pcm_l, pcm_r, mp3data, enc);
if (-1 == ret)
{
return(-1);
}
while (!mp3data.header_parsed)
{
try
{
fd.Read(buf, 0, 1024);
}
catch (IOException e)
{
Console.WriteLine(e.ToString());
Console.Write(e.StackTrace);
return(-1);
}
ret = mpg.hip_decode1_headersB(hip, buf, buf.Length, pcm_l, pcm_r, mp3data, enc);
if (-1 == ret)
{
return(-1);
}
}
if (mp3data.bitrate == 0 && !freeformat)
{
if (parse.silent < 10)
{
Console.Error.WriteLine("fail to sync...");
}
return(lame_decode_initfile(fd, mp3data, enc));
}
if (mp3data.totalframes > 0)
{
}
else
{
mp3data.nsamp = -1;
}
return(0);
}
