FLAC high/medium/low?

[kleinfelter]

The flac codec seems to know about high/medium/low compression. When I look at the doc for the flac reference implementation, it knows about compression levels 0 through 8, with the default being 5.

Is it safe to assume that low=0, medium=5, and high=8?

Is there any way to access any of the other options? (I suppose I could always go CLI and PowerPack.)

TIA

[Spoon]

You asked for it here is exactly what it does:

int Compression = 1; // 0 = low 1 = Med 2 = High

if (Compression == 0)
{
do_exhaustive_model_search = false;
do_escape_coding = false;
do_mid_side = false;
loose_mid_side = false;
qlp_coeff_precision = 0;
min_residual_partition_order = max_residual_partition_order = 2;
rice_parameter_search_dist = 0;
max_lpc_order = 0;
} else if (Compression == 1) {
do_exhaustive_model_search = false;
do_escape_coding = false;
do_mid_side = true;
loose_mid_side = false;
qlp_coeff_precision = 0;
min_residual_partition_order = max_residual_partition_order = 3;
rice_parameter_search_dist = 0;
max_lpc_order = 8;
} else {
do_exhaustive_model_search = true;
do_escape_coding = true;
do_mid_side = true;
loose_mid_side = false;
do_qlp_coeff_prec_search = true;
min_residual_partition_order = 8;
max_residual_partition_order = 8;
rice_parameter_search_dist = 0;
max_lpc_order = 16;
}

[Unregistered]

Okay Spoon, I'll bite...

I was looking for the answer to this and now I've read it I'm still non the wiser.

Would it not be better to use the standard -0 to -8 scale of settings? I use -8 on all my rips but use DMC when having to edit or mangle other wav files to flac. I've used the High option so far, presuming it was -8 but looking at the settings you use they don't seem to match any of the 'standard' ones.

I'm not a flac expert so don't really understand most of the options I'm just curious why you chose to stray from the path with this one, when ones like Lame have the defacto alt preset standard etc.

A nice scroll bar, 0 to 8, would be cool!

Thanks,
Ailean.

[Spoon]

More code this time what flac does with the numbers in the exe compressor:

case '0':
option_values.do_exhaustive_model_search = false;
option_values.do_escape_coding = false;
option_values.do_mid_side = false;
option_values.loose_mid_side = false;
option_values.qlp_coeff_precision = 0;
option_values.min_residual_partition_order = option_values.max_residual_partition_order = 2;
option_values.rice_parameter_search_dist = 0;
option_values.max_lpc_order = 0;
break;
case '1':
option_values.do_exhaustive_model_search = false;
option_values.do_escape_coding = false;
option_values.do_mid_side = true;
option_values.loose_mid_side = true;
option_values.qlp_coeff_precision = 0;
option_values.min_residual_partition_order = option_values.max_residual_partition_order = 2;
option_values.rice_parameter_search_dist = 0;
option_values.max_lpc_order = 0;
break;
case '2':
option_values.do_exhaustive_model_search = false;
option_values.do_escape_coding = false;
option_values.do_mid_side = true;
option_values.loose_mid_side = false;
option_values.qlp_coeff_precision = 0;
option_values.min_residual_partition_order = 0;
option_values.max_residual_partition_order = 3;
option_values.rice_parameter_search_dist = 0;
option_values.max_lpc_order = 0;
break;
case '3':
option_values.do_exhaustive_model_search = false;
option_values.do_escape_coding = false;
option_values.do_mid_side = false;
option_values.loose_mid_side = false;
option_values.qlp_coeff_precision = 0;
option_values.min_residual_partition_order = option_values.max_residual_partition_order = 3;
option_values.rice_parameter_search_dist = 0;
option_values.max_lpc_order = 6;
break;
case '4':
option_values.do_exhaustive_model_search = false;
option_values.do_escape_coding = false;
option_values.do_mid_side = true;
option_values.loose_mid_side = true;
option_values.qlp_coeff_precision = 0;
option_values.min_residual_partition_order = option_values.max_residual_partition_order = 3;
option_values.rice_parameter_search_dist = 0;
option_values.max_lpc_order = 8;
break;
case '5':
option_values.do_exhaustive_model_search = false;
option_values.do_escape_coding = false;
option_values.do_mid_side = true;
option_values.loose_mid_side = false;
option_values.qlp_coeff_precision = 0;
option_values.min_residual_partition_order = option_values.max_residual_partition_order = 3;
option_values.rice_parameter_search_dist = 0;
option_values.max_lpc_order = 8;
break;
case '6':
option_values.do_exhaustive_model_search = false;
option_values.do_escape_coding = false;
option_values.do_mid_side = true;
option_values.loose_mid_side = false;
option_values.qlp_coeff_precision = 0;
option_values.min_residual_partition_order = 0;
option_values.max_residual_partition_order = 4;
option_values.rice_parameter_search_dist = 0;
option_values.max_lpc_order = 8;
break;
case '7':
option_values.do_exhaustive_model_search = true;
option_values.do_escape_coding = false;
option_values.do_mid_side = true;
option_values.loose_mid_side = false;
option_values.qlp_coeff_precision = 0;
option_values.min_residual_partition_order = 0;
option_values.max_residual_partition_order = 6;
option_values.rice_parameter_search_dist = 0;
option_values.max_lpc_order = 8;
break;
case '8':
option_values.do_exhaustive_model_search = true;
option_values.do_escape_coding = false;
option_values.do_mid_side = true;
option_values.loose_mid_side = false;
option_values.qlp_coeff_precision = 0;
option_values.min_residual_partition_order = 0;
option_values.max_residual_partition_order = 6;
option_values.rice_parameter_search_dist = 0;
option_values.max_lpc_order = 12;
break;

[Unregistered]

Re: FLAC high/medium/low?

Ok Spoon.

I too want to know the answer to kleinfelter's question. I'll reword it in the hope of a straight answer:

If low = 0 & medium = 1 & high = 2 THEN
(WTF {does this mean} in regards to the default FLAC settings of 0 - 8?;
do.give_us_an_answer_we_can_understand;
please;
)
ELSE
(GOTO Square 1)
break;

[xoas]

Re: FLAC high/medium/low?

Spoon is on vacation. If you compare the sttings in Spoon's first posting with the flac setting values in his second posting, then the answer to Kleinfelter's question,
"Is it safe to assume that low=0, medium=5, and high=8?"
appears to be "yes".
If some techie who understands all this better then me comes up with a different answer, I'd be happy to hear it.
As to why Spoon might respond to Kleinfelter's question and the followup in the apparently inscrutable manner that he chose, you will need to ask him when he gets back. :komisch12
Bill Mikkelsen

[Spoon]

Re: FLAC high/medium/low?

Just programming waffle