1 /*
2 synth_8bit.h: Wrappers over optimized synth_xtoy for converting signed short to 8bit.
3
4 copyright 1995-2008 by the mpg123 project - free software under the terms of the LGPL 2.1
5 see COPYING and AUTHORS files in distribution or http://mpg123.org
6 initially written by Michael Hipp, code generalized to the wrapper by Thomas Orgis
7
8 Only variable is the BLOCK size to choose 1to1, 2to1 or 4to1.
9 Oh, and the names: BASE_SYNTH_NAME, SYNTH_NAME, MONO_NAME, MONO2STEREO_NAME
10 (p.ex. opt_synth_1to1(fr), synth_1to1_8bit, synth_1to1_8bit_mono, ...).
11 */
12
SYNTH_NAME(real * bandPtr,int channel,mpg123_handle * fr,int final)13 int SYNTH_NAME(real *bandPtr, int channel, mpg123_handle *fr, int final)
14 {
15 short samples_tmp[BLOCK];
16 short *tmp1 = samples_tmp + channel;
17 int i,ret;
18
19 unsigned char *samples = fr->buffer.data;
20 int pnt = fr->buffer.fill;
21 fr->buffer.data = (unsigned char*) samples_tmp;
22 fr->buffer.fill = 0;
23 ret = BASE_SYNTH_NAME(bandPtr, channel, fr , 0);
24 fr->buffer.data = samples;
25
26 samples += channel + pnt;
27 for(i=0;i<(BLOCK/2);i++)
28 {
29 *samples = fr->conv16to8[*tmp1>>AUSHIFT];
30 samples += 2;
31 tmp1 += 2;
32 }
33 fr->buffer.fill = pnt + (final ? BLOCK : 0 );
34
35 return ret;
36 }
37
MONO_NAME(real * bandPtr,mpg123_handle * fr)38 int MONO_NAME(real *bandPtr, mpg123_handle *fr)
39 {
40 short samples_tmp[BLOCK];
41 short *tmp1 = samples_tmp;
42 int i,ret;
43
44 unsigned char *samples = fr->buffer.data;
45 int pnt = fr->buffer.fill;
46 fr->buffer.data = (unsigned char*) samples_tmp;
47 fr->buffer.fill = 0;
48 ret = BASE_SYNTH_NAME(bandPtr, 0, fr, 0);
49 fr->buffer.data = samples;
50
51 samples += pnt;
52 for(i=0;i<(BLOCK/2);i++)
53 {
54 *samples++ = fr->conv16to8[*tmp1>>AUSHIFT];
55 tmp1+=2;
56 }
57 fr->buffer.fill = pnt + BLOCK/2;
58
59 return ret;
60 }
61
MONO2STEREO_NAME(real * bandPtr,mpg123_handle * fr)62 int MONO2STEREO_NAME(real *bandPtr, mpg123_handle *fr)
63 {
64 short samples_tmp[BLOCK];
65 short *tmp1 = samples_tmp;
66 int i,ret;
67
68 unsigned char *samples = fr->buffer.data;
69 int pnt = fr->buffer.fill;
70 fr->buffer.data = (unsigned char*) samples_tmp;
71 fr->buffer.fill = 0;
72 ret = BASE_SYNTH_NAME(bandPtr, 0, fr, 0);
73 fr->buffer.data = samples;
74
75 samples += pnt;
76 for(i=0;i<(BLOCK/2);i++)
77 {
78 *samples++ = fr->conv16to8[*tmp1>>AUSHIFT];
79 *samples++ = fr->conv16to8[*tmp1>>AUSHIFT];
80 tmp1 += 2;
81 }
82 fr->buffer.fill = pnt + BLOCK;
83
84 return ret;
85 }
86
87