From 22f1fce330059ef8a383cf327a023d6a9da5ad3e Mon Sep 17 00:00:00 2001 From: "Matthias P. Braendli" Date: Mon, 15 Feb 2016 02:44:20 +0100 Subject: Include toolame-dab as library --- libtoolame-dab/availbits.c | 67 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 67 insertions(+) create mode 100644 libtoolame-dab/availbits.c (limited to 'libtoolame-dab/availbits.c') diff --git a/libtoolame-dab/availbits.c b/libtoolame-dab/availbits.c new file mode 100644 index 0000000..809c28e --- /dev/null +++ b/libtoolame-dab/availbits.c @@ -0,0 +1,67 @@ +/* + * toolame - an optimized mpeg 1/2 layer 2 audio encoder + * Copyright (C) 2001 Michael Cheng + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ +#include +#include "common.h" +#include "encoder.h" +#include "musicin.h" +#include "options.h" +#include "availbits.h" + + +struct slotinfo { + double average; + double frac; + int whole; + double lag; + int extra; +} slots; + +/* function returns the number of available bits */ +int available_bits (frame_header *header, options * glopts) +{ + int adb; + + slots.extra = 0; /* be default, no extra slots */ + + slots.average = + (1152.0 / s_freq[header->version][header->sampling_frequency]) * + ((double) bitrate[header->version][header->bitrate_index] / 8.0); + + slots.whole = (int) slots.average; + slots.frac = slots.average - (double) slots.whole; + + /* never allow padding for a VBR frame. + Don't ask me why, I've forgotten why I set this */ + if (slots.frac != 0 && glopts->usepadbit && glopts->vbr == FALSE) { + if (slots.lag > (slots.frac - 1.0)) { /* no padding for this frame */ + slots.lag -= slots.frac; + slots.extra = 0; + header->padding = 0; + } else { /* padding */ + + slots.extra = 1; + header->padding = 1; + slots.lag += (1 - slots.frac); + } + } + + adb = (slots.whole + slots.extra) * 8; + + return adb; +} -- cgit v1.2.3