1 /*
2 * TwoLAME: an optimized MPEG Audio Layer Two encoder
3 *
4 * Copyright (C) 2001-2004 Michael Cheng
5 * Copyright (C) 2004-2006 The TwoLAME Project
6 *
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 *
21 * $Id$
22 *
23 */
24
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <string.h>
28 #include <math.h>
29 #include <assert.h>
30
31 #include "twolame.h"
32 #include "common.h"
33 #include "util.h"
34
35
36 // Return string containg version number
37 // of this library
get_twolame_version(void)38 const char *get_twolame_version(void)
39 {
40 const char *str = PACKAGE_VERSION;
41
42 return str;
43 }
44
45 // Return string containg version number
46 // of this library
get_twolame_url(void)47 const char *get_twolame_url(void)
48 {
49 const char *str = "http://www.twolame.org";
50
51 return str;
52 }
53
54
55 /* 1: MPEG-1, 0: MPEG-2 LSF, 1995-07-11 shn */
56 static const int bitrate_table[2][15] = {
57 {0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160},
58 {0, 32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 384}
59 };
60
61 //
62 // Returns a name string for MPEG version enumeration
63 //
twolame_mpeg_version_name(int version)64 const char *twolame_mpeg_version_name(int version)
65 {
66 static const char *version_name[3] = { "MPEG-2 LSF", "MPEG-1", "Illegal Version" };
67 if (version == 0)
68 return (version_name[0]);
69 if (version == 1)
70 return (version_name[1]);
71 return (version_name[2]);
72 }
73
74
75 // Returns the index associated with a bitrate for
76 // the specified version of MPEG.
77 //
78 // Returns -1 for invalid bitrates
79 //
twolame_get_bitrate_index(int bitrate,TWOLAME_MPEG_version version)80 int twolame_get_bitrate_index(int bitrate, TWOLAME_MPEG_version version)
81 {
82 int index = 0;
83 int found = 0;
84
85 // MFC sanity check.
86 if (version != 0 && version != 1) {
87 fprintf(stderr, "twolame_get_bitrate_index: invalid version index %i\n", version);
88 return -1;
89 }
90
91 while (!found && index < 15) {
92 if (bitrate_table[version][index] == bitrate)
93 found = 1;
94 else
95 ++index;
96 }
97
98 if (found)
99 return (index);
100 else {
101 fprintf(stderr,
102 "twolame_get_bitrate_index: %d is not a legal bitrate for version '%s'\n",
103 bitrate, twolame_mpeg_version_name(version));
104 return -1;
105 }
106 }
107
108 // convert samp frq in Hz to index
109 // legal rates 16000, 22050, 24000, 32000, 44100, 48000
110 // -1 is returned for invalid samplerates
twolame_get_samplerate_index(long sample_rate)111 int twolame_get_samplerate_index(long sample_rate)
112 {
113
114 switch (sample_rate) {
115 case 44100L:
116 return 0;
117 case 48000L:
118 return 1;
119 case 32000L:
120 return 2;
121 case 22050L:
122 return 0;
123 case 24000L:
124 return 1;
125 case 16000L:
126 return 2;
127 }
128
129 // Invalid choice of samplerate
130 fprintf(stderr, "twolame_get_samplerate_index: %ld is not a legal sample rate\n", sample_rate);
131 return -1;
132 }
133
134
135 // Return the MPEG Version to use for the specified samplerate
136 // -1 is returned for invalid samplerates
twolame_get_version_for_samplerate(long sample_rate)137 int twolame_get_version_for_samplerate(long sample_rate)
138 {
139
140 switch (sample_rate) {
141 case 48000L:
142 return TWOLAME_MPEG1;
143 case 44100L:
144 return TWOLAME_MPEG1;
145 case 32000L:
146 return TWOLAME_MPEG1;
147 case 24000L:
148 return TWOLAME_MPEG2;
149 case 22050L:
150 return TWOLAME_MPEG2;
151 case 16000L:
152 return TWOLAME_MPEG2;
153 }
154
155 // Invalid choice of samplerate
156 fprintf(stderr, "twolame_get_version_for_samplerate: %ld is not a legal sample rate\n",
157 sample_rate);
158 return -1;
159 }
160
161
162 // Get the number of bytes per frame, for current settings
twolame_get_framelength(twolame_options * glopts)163 int twolame_get_framelength(twolame_options * glopts)
164 {
165 int bytes = 144 * (glopts->bitrate * 1000) / glopts->samplerate_out;
166
167 if (glopts->padding)
168 bytes++;
169
170 return bytes;
171 }
172
173
174
175 // Print the library version and
176 // encoder parameter settings to STDERR
twolame_print_config(twolame_options * glopts)177 void twolame_print_config(twolame_options * glopts)
178 {
179 FILE *fd = stderr;
180
181 // Are we being silent ?
182 if (glopts->verbosity <= 0)
183 return;
184
185
186
187 // Are we being brief ?
188 if (glopts->verbosity == 1) {
189
190 fprintf(fd, "LibTwoLame version %s (%s)\n", get_twolame_version(), get_twolame_url());
191 fprintf(fd, "Encoding as %dHz, ", twolame_get_out_samplerate(glopts));
192 fprintf(fd, "%d kbps, ", twolame_get_bitrate(glopts));
193 if (twolame_get_VBR(glopts))
194 fprintf(fd, "VBR, ");
195 else
196 fprintf(fd, "CBR, ");
197 fprintf(fd, "%s Layer II\n", twolame_get_version_name(glopts));
198
199 } else {
200
201 fprintf(fd, "---------------------------------------------------------\n");
202 fprintf(fd, "LibTwoLame %s (%s)\n", get_twolame_version(), get_twolame_url());
203 fprintf(fd, "Input : %d Hz, %d channels\n",
204 twolame_get_in_samplerate(glopts), twolame_get_num_channels(glopts));
205 fprintf(fd, "Output: %d Hz, %s\n",
206 twolame_get_out_samplerate(glopts), twolame_get_mode_name(glopts));
207 fprintf(fd, "%d kbps ", twolame_get_bitrate(glopts));
208 if (twolame_get_VBR(glopts))
209 fprintf(fd, "VBR ");
210 else
211 fprintf(fd, "CBR ");
212 fprintf(fd, "%s Layer II ", twolame_get_version_name(glopts));
213 fprintf(fd, "psycho model=%d \n", twolame_get_psymodel(glopts));
214
215 fprintf(fd, "[De-emph:%s Copyright:%s Original:%s]\n",
216 ((twolame_get_emphasis(glopts)) ? "On " : "Off"),
217 ((twolame_get_copyright(glopts)) ? "Yes" : "No "),
218 ((twolame_get_original(glopts)) ? "Yes" : "No "));
219
220 fprintf(fd, "[Padding:%s CRC:%s Energy:%s ]\n",
221 ((twolame_get_padding(glopts)) ? "Normal" : "Off "),
222 ((twolame_get_error_protection(glopts)) ? "On " : "Off"),
223 ((twolame_get_energy_levels(glopts)) ? "On " : "Off"));
224
225 if (glopts->verbosity >= 3) {
226 if (twolame_get_VBR(glopts)) {
227 fprintf(fd, " - VBR Enabled. Using MNR boost of %f\n",
228 twolame_get_VBR_level(glopts));
229 fprintf(fd, " - VBR bitrate index limits [%i -> %i]\n", glopts->lower_index,
230 glopts->upper_index);
231 }
232
233 fprintf(fd, " - ATH adjustment %f\n", twolame_get_ATH_level(glopts));
234 if (twolame_get_num_ancillary_bits(glopts))
235 fprintf(fd, " - Reserving %i ancillary bits\n",
236 twolame_get_num_ancillary_bits(glopts));
237
238 if (twolame_get_scale(glopts) != 1.0f)
239 fprintf(fd, " - Scaling audio by %f\n", twolame_get_scale(glopts));
240 if (twolame_get_scale_left(glopts) != 1.0f)
241 fprintf(fd, " - Scaling left channel by %f\n", twolame_get_scale_left(glopts));
242 if (twolame_get_scale_right(glopts) != 1.0f)
243 fprintf(fd, " - Scaling right channel by %f\n", twolame_get_scale_right(glopts));
244
245 // if (glopts->num_channels_in == 2 && glopts->num_channels_out == 1 ) {
246 // fprintf(fd, " - Downmixing from stereo to mono.\n");
247 // } else if (glopts->num_channels_in == 1 && glopts->num_channels_out == 2 ) {
248 // fprintf(fd, " - Upmixing from mono to stereo.\n");
249 // }
250 }
251
252 fprintf(fd, "---------------------------------------------------------\n");
253
254 }
255 }
256
257
258 // vim:ts=4:sw=4:nowrap:
259