diff options
Diffstat (limited to 'gst/mve/mveaudioenc.c')
| -rw-r--r-- | gst/mve/mveaudioenc.c | 154 |
1 files changed, 0 insertions, 154 deletions
diff --git a/gst/mve/mveaudioenc.c b/gst/mve/mveaudioenc.c deleted file mode 100644 index 1cff20a71..000000000 --- a/gst/mve/mveaudioenc.c +++ /dev/null @@ -1,154 +0,0 @@ -/* - * Interplay MVE audio compressor - * Copyright (C) 2003, 2004 Alexander Belyakov <abel@krasu.ru> - * Copyright (C) 2006 Jens Granseuer <jensgr@gmx.net> - * - * This library is free software; you can redistribute it and/or - * modify it under the terms of the GNU Library General Public - * License as published by the Free Software Foundation; either - * version 2 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 - * Library General Public License for more details. - * - * You should have received a copy of the GNU Library General Public - * License along with this library; if not, write to the - * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, - * Boston, MA 02110-1301, USA. - */ - -#include <math.h> -#include <stdlib.h> - -#include "gstmvemux.h" - -static const gint32 dec_table[256] = { - 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, - 16, 17, 18, 19, - 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, - 32, 33, 34, 35, 36, 37, - 38, 39, 40, 41, 42, 43, 47, 51, 56, 61, - 66, 72, 79, 86, 94, 102, 112, - 122, 133, 145, 158, 173, 189, 206, 225, 245, - 267, 292, 318, 348, 379, - 414, 452, 493, 538, 587, 640, 699, 763, 832, 908, 991, - 1081, 1180, 1288, - 1405, 1534, 1673, 1826, 1993, 2175, 2373, 2590, 2826, 3084, 3365, 3672, - 4008, - 4373, 4772, 5208, 5683, 6202, 6767, 7385, 8059, 8794, 9597, 10472, - 11428, 12471, 13609, 14851, 16206, - 17685, 19298, 21060, 22981, 25078, - 27367, 29864, 32589, 35563, 38808, 42350, 46214, 50431, 55033, 60055, - 65535, - 1, -65535, -60055, -55033, -50431, -46214, -42350, -38808, -35563, - -32589, -29864, -27367, -25078, -22981, -21060, -19298, - -17685, -16206, - -14851, -13609, -12471, -11428, -10472, -9597, -8794, -8059, -7385, -6767, - -6202, -5683, -5208, -4772, - -4373, -4008, -3672, -3365, -3084, -2826, - -2590, -2373, -2175, -1993, -1826, -1673, -1534, -1405, -1288, -1180, - - -1081, -991, -908, -832, -763, -699, -640, -587, -538, -493, -452, -414, - -379, -348, -318, -292, - -267, -245, -225, -206, -189, -173, -158, -145, - -133, -122, -112, -102, -94, -86, -79, -72, - -66, -61, -56, -51, -47, -43, - -42, -41, -40, -39, -38, -37, -36, -35, -34, -33, - -32, -31, -30, -29, - -28, -27, -26, -25, -24, -23, -22, -21, -20, -19, -18, -17, - -16, -15, - -14, -13, -12, -11, -10, -9, -8, -7, -6, -5, -4, -3, -2, -1 -}; - - - -/* This value could be non-optimal. Without knowledge of the value - distribution in the real signal, the actual optimum cannot be evaluated. - Should be somewhere between 11.458 and 11.542. */ -static const gdouble DPCM_SCALE = 11.5131; - -static gint8 -mve_enc_delta (guint n) -{ - if (n < 44) - return n; - return floor (DPCM_SCALE * log (n)); -} - -gint -mve_compress_audio (guint8 * dest, const guint8 * src, guint16 len, - guint8 channels) -{ - gint16 prev[2], s; - gint delta, real_res; - gint cur_chan; - guint8 v; - - for (cur_chan = 0; cur_chan < channels; ++cur_chan) { - prev[cur_chan] = GST_READ_UINT16_LE (src); - GST_WRITE_UINT16_LE (dest, prev[cur_chan]); - src += 2; - dest += 2; - len -= 2; - } - - cur_chan = 0; - while (len > 0) { - s = GST_READ_UINT16_LE (src); - src += 2; - - delta = s - prev[cur_chan]; - - if (delta >= 0) - - v = mve_enc_delta (delta); - - else - - v = 256 - mve_enc_delta (-delta); - - - real_res = dec_table[v] + prev[cur_chan]; - - if (real_res < -32768 || real_res > 32767) { - - /* correct overflow */ - /* GST_DEBUG ("co:%d + %d = %d -> new v:%d, dec_table:%d will be %d", - prev[cur_chan], dec_table[v], real_res, - v, dec_table[v], prev[cur_chan]+dec_table[v]); */ - if (s > 0) { - - if (real_res > 32767) - --v; - - } else { - - if (real_res < -32768) - ++v; - - } - - real_res = dec_table[v] + prev[cur_chan]; - - } - - if (G_UNLIKELY (abs (real_res - s) > 32767)) { - GST_ERROR ("sign loss left unfixed in audio stream, deviation:%d", - real_res - s); - return -1; - } - - - *dest++ = v; - - --len; - /* use previous output instead of input. That way output will not go too far from input. */ - prev[cur_chan] += dec_table[v]; - cur_chan = channels - 1 - cur_chan; - - } - - return 0; -} |