rename FLAC__Encoder to FLAC__StreamEncoder, OOPize encoder and decoder interfaces
[flac.git] / src / flac / analyze.c
1 /* flac - Command-line FLAC encoder/decoder
2  * Copyright (C) 2000,2001  Josh Coalson
3  *
4  * This program is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU General Public License
6  * as published by the Free Software Foundation; either version 2
7  * of the License, or (at your option) any later version.
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program; if not, write to the Free Software
16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
17  */
18
19 #include <math.h>
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <string.h>
23 #include "FLAC/all.h"
24 #include "analyze.h"
25
26 typedef struct {
27         int32 residual;
28         unsigned count;
29 } pair_t;
30
31 typedef struct {
32         pair_t buckets[FLAC__MAX_BLOCK_SIZE];
33         int peak_index;
34         unsigned nbuckets;
35         unsigned nsamples;
36         double sum, sos;
37         double variance;
38         double mean;
39         double stddev;
40 } subframe_stats_t;
41
42 static subframe_stats_t all_;
43
44 static void init_stats(subframe_stats_t *stats);
45 static void update_stats(subframe_stats_t *stats, int32 residual, unsigned incr);
46 static void compute_stats(subframe_stats_t *stats);
47 static bool dump_stats(const subframe_stats_t *stats, const char *filename);
48
49 void flac__analyze_init(analysis_options aopts)
50 {
51         if(aopts.do_residual_gnuplot) {
52                 init_stats(&all_);
53         }
54 }
55
56 void flac__analyze_frame(const FLAC__Frame *frame, unsigned frame_number, analysis_options aopts, FILE *fout)
57 {
58         const unsigned channels = frame->header.channels;
59         char outfilename[1024];
60         subframe_stats_t stats;
61         unsigned i, channel;
62
63         /* do the human-readable part first */
64         fprintf(fout, "frame=%u\tblocksize=%u\tsample_rate=%u\tchannels=%u\tchannel_assignment=%s\n", frame_number, frame->header.blocksize, frame->header.sample_rate, channels, FLAC__ChannelAssignmentString[frame->header.channel_assignment]);
65         for(channel = 0; channel < channels; channel++) {
66                 const FLAC__Subframe *subframe = frame->subframes+channel;
67                 fprintf(fout, "\tsubframe=%u\twasted_bits=%u\ttype=%s", channel, subframe->wasted_bits, FLAC__SubframeTypeString[subframe->type]);
68                 switch(subframe->type) {
69                         case FLAC__SUBFRAME_TYPE_CONSTANT:
70                                 fprintf(fout, "\tvalue=%d\n", subframe->data.constant.value);
71                                 break;
72                         case FLAC__SUBFRAME_TYPE_FIXED:
73                                 fprintf(fout, "\torder=%u\tpartition_order=%u\n", subframe->data.fixed.order, subframe->data.fixed.entropy_coding_method.data.partitioned_rice.order); /*@@@ assumes method is partitioned-rice */
74                                 for(i = 0; i < subframe->data.fixed.order; i++)
75                                         fprintf(fout, "\t\twarmup[%u]=%d\n", i, subframe->data.fixed.warmup[i]);
76                                 if(aopts.do_residual_text) {
77                                         for(i = 0; i < frame->header.blocksize-subframe->data.fixed.order; i++)
78                                                 fprintf(fout, "\t\tresidual[%u]=%d\n", i, subframe->data.fixed.residual[i]);
79                                 }
80                                 break;
81                         case FLAC__SUBFRAME_TYPE_LPC:
82                                 fprintf(fout, "\torder=%u\tpartition_order=%u\tqlp_coeff_precision=%u\tquantization_level=%d\n", subframe->data.lpc.order, subframe->data.lpc.entropy_coding_method.data.partitioned_rice.order, subframe->data.lpc.qlp_coeff_precision, subframe->data.lpc.quantization_level); /*@@@ assumes method is partitioned-rice */
83                                 for(i = 0; i < subframe->data.lpc.order; i++)
84                                         fprintf(fout, "\t\twarmup[%u]=%d\n", i, subframe->data.lpc.warmup[i]);
85                                 if(aopts.do_residual_text) {
86                                         for(i = 0; i < frame->header.blocksize-subframe->data.lpc.order; i++)
87                                                 fprintf(fout, "\t\tresidual[%u]=%d\n", i, subframe->data.lpc.residual[i]);
88                                 }
89                                 break;
90                         case FLAC__SUBFRAME_TYPE_VERBATIM:
91                                 fprintf(fout, "\n");
92                                 break;
93                 }
94         }
95
96         /* now do the residual distributions if requested */
97         if(aopts.do_residual_gnuplot) {
98                 for(channel = 0; channel < channels; channel++) {
99                         const FLAC__Subframe *subframe = frame->subframes+channel;
100                         unsigned residual_samples;
101
102                         init_stats(&stats);
103
104                         switch(subframe->type) {
105                                 case FLAC__SUBFRAME_TYPE_FIXED:
106                                         residual_samples = frame->header.blocksize - subframe->data.fixed.order;
107                                         for(i = 0; i < residual_samples; i++)
108                                                 update_stats(&stats, subframe->data.fixed.residual[i], 1);
109                                         break;
110                                 case FLAC__SUBFRAME_TYPE_LPC:
111                                         residual_samples = frame->header.blocksize - subframe->data.lpc.order;
112                                         for(i = 0; i < residual_samples; i++)
113                                                 update_stats(&stats, subframe->data.lpc.residual[i], 1);
114                                         break;
115                                 default:
116                                         break;
117                         }
118
119                         /* update all_ */
120                         for(i = 0; i < stats.nbuckets; i++) {
121                                 update_stats(&all_, stats.buckets[i].residual, stats.buckets[i].count);
122                         }
123
124                         /* write the subframe */
125                         sprintf(outfilename, "f%06u.s%u.gp", frame_number, channel);
126                         compute_stats(&stats);
127
128                         (void)dump_stats(&stats, outfilename);
129                 }
130         }
131 }
132
133 void flac__analyze_finish(analysis_options aopts)
134 {
135         if(aopts.do_residual_gnuplot) {
136                 compute_stats(&all_);
137                 (void)dump_stats(&all_, "all");
138         }
139 }
140
141 void init_stats(subframe_stats_t *stats)
142 {
143         stats->peak_index = -1;
144         stats->nbuckets = 0;
145         stats->nsamples = 0;
146         stats->sum = 0.0;
147         stats->sos = 0.0;
148 }
149
150 void update_stats(subframe_stats_t *stats, int32 residual, unsigned incr)
151 {
152         unsigned i;
153         const double r = (double)residual, a = r*incr;
154
155         stats->nsamples += incr;
156         stats->sum += a;
157         stats->sos += (a*r);
158
159         for(i = 0; i < stats->nbuckets; i++) {
160                 if(stats->buckets[i].residual == residual) {
161                         stats->buckets[i].count += incr;
162                         goto find_peak;
163                 }
164         }
165         /* not found, make a new bucket */
166         i = stats->nbuckets;
167         stats->buckets[i].residual = residual;
168         stats->buckets[i].count = incr;
169         stats->nbuckets++;
170 find_peak:
171         if(stats->peak_index < 0 || stats->buckets[i].count > stats->buckets[stats->peak_index].count)
172                 stats->peak_index = i;
173 }
174
175 void compute_stats(subframe_stats_t *stats)
176 {
177         stats->mean = stats->sum / (double)stats->nsamples;
178         stats->variance = (stats->sos - (stats->sum * stats->sum / stats->nsamples)) / stats->nsamples;
179         stats->stddev = sqrt(stats->variance);
180 }
181
182 bool dump_stats(const subframe_stats_t *stats, const char *filename)
183 {
184         FILE *outfile;
185         unsigned i;
186         const double m = stats->mean;
187         const double s1 = stats->stddev, s2 = s1*2, s3 = s1*3, s4 = s1*4, s5 = s1*5, s6 = s1*6;
188         const double p = stats->buckets[stats->peak_index].count;
189
190         outfile = fopen(filename, "w");
191
192         if(0 == outfile) {
193                 fprintf(stderr, "ERROR opening %s\n", filename);
194                 return false;
195         }
196
197         fprintf(outfile, "plot '-' title 'PDF', '-' title 'mean' with impulses, '-' title '1-stddev' with histeps, '-' title '2-stddev' with histeps, '-' title '3-stddev' with histeps, '-' title '4-stddev' with histeps, '-' title '5-stddev' with histeps, '-' title '6-stddev' with histeps\n");
198
199         for(i = 0; i < stats->nbuckets; i++) {
200                 fprintf(outfile, "%d %u\n", stats->buckets[i].residual, stats->buckets[i].count);
201         }
202         fprintf(outfile, "e\n");
203
204         fprintf(outfile, "%f %f\ne\n", stats->mean, p);
205         fprintf(outfile, "%f %f\n%f %f\ne\n", m-s1, p*0.8, m+s1, p*0.8);
206         fprintf(outfile, "%f %f\n%f %f\ne\n", m-s2, p*0.7, m+s2, p*0.7);
207         fprintf(outfile, "%f %f\n%f %f\ne\n", m-s3, p*0.6, m+s3, p*0.6);
208         fprintf(outfile, "%f %f\n%f %f\ne\n", m-s4, p*0.5, m+s4, p*0.5);
209         fprintf(outfile, "%f %f\n%f %f\ne\n", m-s5, p*0.4, m+s5, p*0.4);
210         fprintf(outfile, "%f %f\n%f %f\ne\n", m-s6, p*0.3, m+s6, p*0.3);
211
212         fprintf(outfile, "pause -1 'waiting...'\n");
213
214         fclose(outfile);
215         return true;
216 }