Introduce btr_node_status() and add btr support to the file writer.
[paraslash.git] / compress_filter.c
1 /*
2 * Copyright (C) 2005-2009 Andre Noll <maan@systemlinux.org>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6
7 /** \file compress_filter.c Paraslash's dynamic audio range compressor. */
8
9 /*
10 * Uses ideas of AudioCompress, (C) 2002-2004 M. Hari Nezumi <magenta@trikuare.cx>
11 */
12
13 #include <regex.h>
14 #include <stdbool.h>
15
16 #include "para.h"
17 #include "compress_filter.cmdline.h"
18 #include "list.h"
19 #include "sched.h"
20 #include "ggo.h"
21 #include "buffer_tree.h"
22 #include "filter.h"
23 #include "string.h"
24 #include "error.h"
25
26 /** The size of the output data buffer. */
27 #define COMPRESS_CHUNK_SIZE 40960
28
29 /** Data specific to the compress filter. */
30 struct private_compress_data {
31 /** The current multiplier. */
32 unsigned current_gain;
33 /** Points to the configuration data for this instance of the compress filter. */
34 struct compress_filter_args_info *conf;
35 /** Maximal admissible gain. */
36 unsigned max_gain;
37 /** Number of samples already seen. */
38 unsigned num_samples;
39 /** Absolute value of the maximal sample in the current block. */
40 int peak;
41 };
42
43 static ssize_t compress(char *inbuf, size_t inbuf_len, struct filter_node *fn)
44 {
45 size_t i, length = PARA_MIN((inbuf_len / 2) * 2,
46 (fn->bufsize - fn->loaded) / 2 * 2);
47 struct private_compress_data *pcd = fn->private_data;
48 int16_t *ip = (int16_t *)inbuf, *op = (int16_t *)(fn->buf + fn->loaded);
49 unsigned gain_shift = pcd->conf->inertia_arg + pcd->conf->damp_arg,
50 mask = (1 << pcd->conf->blocksize_arg) - 1;
51
52 if (!length)
53 return 0;
54 for (i = 0; i < length / 2; i++) {
55 /* be careful in that heat, my dear */
56 int sample = *ip++, adjusted_sample = (PARA_ABS(sample) *
57 pcd->current_gain) >> gain_shift;
58 if (adjusted_sample > 32767) { /* clip */
59 PARA_NOTICE_LOG("clip: sample: %d, adjusted sample: %d\n",
60 sample, adjusted_sample);
61 adjusted_sample = 32767;
62 pcd->current_gain = (3 * pcd->current_gain +
63 (1 << pcd->conf->inertia_arg)) / 4;
64 pcd->peak = 0;
65 } else
66 pcd->peak = PARA_MAX(pcd->peak, adjusted_sample);
67 *op++ = sample >= 0? adjusted_sample : -adjusted_sample;
68 if (++pcd->num_samples & mask)
69 continue;
70 // PARA_DEBUG_LOG("gain: %u, peak: %u\n", pcd->current_gain,
71 // pcd->peak);
72 if (pcd->peak < pcd->conf->target_level_arg) {
73 if (pcd->current_gain < pcd->max_gain)
74 pcd->current_gain++;
75 } else
76 pcd->current_gain = PARA_MAX(pcd->current_gain - 2,
77 1U << pcd->conf->inertia_arg);
78 pcd->peak = 0;
79 }
80 fn->loaded += length;
81 return length;
82 }
83
84 static void close_compress(struct filter_node *fn)
85 {
86 free(fn->private_data);
87 free(fn->buf);
88 }
89
90 static void compress_post_select(__a_unused struct sched *s, struct task *t)
91 {
92 struct filter_node *fn = container_of(t, struct filter_node, task);
93 struct private_compress_data *pcd = fn->private_data;
94 struct btr_node *btrn = fn->btrn;
95 bool inplace = btr_inplace_ok(btrn);
96 int ret;
97 char *inbuf;
98 size_t length, i;
99 int16_t *ip, *op;
100 unsigned gain_shift = pcd->conf->inertia_arg + pcd->conf->damp_arg,
101 mask = (1 << pcd->conf->blocksize_arg) - 1;
102
103 //inplace = false;
104 next_buffer:
105 t->error = 0;
106 ret = btr_node_status(btrn, fn->min_iqs);
107 if (ret < 0)
108 goto err;
109 if (ret == 0)
110 return;
111 btr_merge(btrn, fn->min_iqs);
112 length = btr_next_buffer(btrn, &inbuf) & ~(size_t)1;
113 ip = (int16_t *)inbuf;
114 if (inplace)
115 op = ip;
116 else
117 op = para_malloc(length);
118 for (i = 0; i < length / 2; i++) {
119 /* be careful in that heat, my dear */
120 int sample = *ip++, adjusted_sample = (PARA_ABS(sample) *
121 pcd->current_gain) >> gain_shift;
122 if (adjusted_sample > 32767) { /* clip */
123 PARA_NOTICE_LOG("clip: sample: %d, adjusted sample: %d\n",
124 sample, adjusted_sample);
125 adjusted_sample = 32767;
126 pcd->current_gain = (3 * pcd->current_gain +
127 (1 << pcd->conf->inertia_arg)) / 4;
128 pcd->peak = 0;
129 } else
130 pcd->peak = PARA_MAX(pcd->peak, adjusted_sample);
131 op[i] = sample >= 0? adjusted_sample : -adjusted_sample;
132 if (++pcd->num_samples & mask)
133 continue;
134 // PARA_DEBUG_LOG("gain: %u, peak: %u\n", pcd->current_gain,
135 // pcd->peak);
136 if (pcd->peak < pcd->conf->target_level_arg) {
137 if (pcd->current_gain < pcd->max_gain)
138 pcd->current_gain++;
139 } else
140 pcd->current_gain = PARA_MAX(pcd->current_gain - 2,
141 1U << pcd->conf->inertia_arg);
142 pcd->peak = 0;
143 }
144 if (inplace)
145 btr_pushdown_one(btrn);
146 else {
147 btr_consume(btrn, length);
148 btr_add_output((char *)op, length, btrn);
149 }
150 goto next_buffer;
151 err:
152 assert(ret < 0);
153 close_compress(fn);
154 t->error = ret;
155 btr_del_node(btrn);
156 }
157
158 /** TODO: Add sanity checks */
159 static int compress_parse_config(int argc, char **argv, void **config)
160 {
161 int ret;
162 struct compress_filter_args_info *compress_conf
163 = para_calloc(sizeof(*compress_conf));
164
165 ret = -E_COMPRESS_SYNTAX;
166 if (compress_cmdline_parser(argc, argv, compress_conf))
167 goto err;
168 *config = compress_conf;
169 return 1;
170 err:
171 free(compress_conf);
172 return ret;
173 }
174
175 static void open_compress(struct filter_node *fn)
176 {
177 struct private_compress_data *pcd = para_calloc(
178 sizeof(struct private_compress_data));
179 pcd->conf = fn->conf;
180 fn->private_data = pcd;
181 fn->min_iqs = 2; /* 16 bit audio */
182 fn->bufsize = COMPRESS_CHUNK_SIZE;
183 fn->buf = para_malloc(fn->bufsize);
184 pcd->current_gain = 1 << pcd->conf->inertia_arg;
185 pcd->max_gain = 1 << (pcd->conf->inertia_arg + pcd->conf->aggressiveness_arg);
186 }
187
188 /**
189 * The init function of the compress filter.
190 *
191 * \param f Pointer to the struct to initialize.
192 */
193 void compress_filter_init(struct filter *f)
194 {
195 struct compress_filter_args_info dummy;
196
197 compress_cmdline_parser_init(&dummy);
198 f->open = open_compress;
199 f->close = close_compress;
200 f->convert = compress;
201 f->pre_select = generic_filter_pre_select;
202 f->post_select = compress_post_select;
203 f->parse_config = compress_parse_config;
204 f->help = (struct ggo_help) {
205 .short_help = compress_filter_args_info_help,
206 .detailed_help = compress_filter_args_info_detailed_help
207 };
208 }