Add btr support to filter code.
[paraslash.git] / wav_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 wav_filter.c A filter that inserts a wave header. */
8
9 #include <regex.h>
10 #include <stdbool.h>
11
12 #include "para.h"
13 #include "error.h"
14 #include "list.h"
15 #include "sched.h"
16 #include "ggo.h"
17 #include "buffer_tree.h"
18 #include "filter.h"
19 #include "string.h"
20 #include "portable_io.h"
21
22 /** size of the output buffer */
23 #define WAV_OUTBUF_SIZE 81920
24 /** a wav header is always 44 bytes */
25 #define WAV_HEADER_LEN 44
26 /** always write 16 bit header */
27 #define BITS 16
28
29 static void make_wav_header(unsigned int channels, unsigned int samplerate,
30 struct filter_node *fn)
31 {
32
33 char *headbuf = fn->buf;
34 unsigned int size = 0x7fffffff;
35 int bytespersec = channels * samplerate * BITS / 8;
36 int align = channels * BITS / 8;
37
38 PARA_DEBUG_LOG("writing wave header: %d channels, %d KHz\n", channels, samplerate);
39 memset(headbuf, 0, WAV_HEADER_LEN);
40 memcpy(headbuf, "RIFF", 4);
41 write_u32(headbuf + 4, size - 8);
42 memcpy(headbuf + 8, "WAVE", 4);
43 memcpy(headbuf + 12, "fmt ", 4);
44 write_u32(headbuf + 16, 16); /* 16 + extra format bytes (zero) */
45 write_u16(headbuf + 20, 1); /* format (1 == PCM/uncompressed) */
46 write_u16(headbuf + 22, channels);
47 write_u32(headbuf + 24, samplerate);
48 write_u32(headbuf + 28, bytespersec);
49 write_u16(headbuf + 32, align); /* number of bytes per sample slice */
50 write_u16(headbuf + 34, BITS); /* significant bits per sample */
51 memcpy(headbuf + 36, "data", 4); /* chunk ID */
52 write_u32(headbuf + 40, size - 44); /* chunk size */
53 }
54
55 static ssize_t wav_convert(char *inbuf, size_t len, struct filter_node *fn)
56 {
57 size_t copy;
58 int *bof = fn->private_data;
59
60 if (*bof) {
61 if (!len)
62 return 0;
63 if (!fn->fc->channels || !fn->fc->samplerate) {
64 PARA_ERROR_LOG("%s\n", para_strerror(E_WAV_BAD_FC));
65 return -E_WAV_BAD_FC;
66 }
67 make_wav_header(fn->fc->channels, fn->fc->samplerate, fn);
68 fn->loaded = WAV_HEADER_LEN;
69 *bof = 0;
70 // return 0;
71 }
72 copy = PARA_MIN(len, fn->bufsize - fn->loaded);
73 memmove(fn->buf + fn->loaded, inbuf, copy);
74 fn->loaded += copy;
75 // PARA_DEBUG_LOG("len = %d, copy = %d\n", len, copy);
76 return copy;
77 }
78
79 static void wav_close(struct filter_node *fn)
80 {
81 free(fn->buf);
82 fn->buf = NULL;
83 free(fn->private_data);
84 fn->private_data = NULL;
85 }
86
87 static void wav_open(struct filter_node *fn)
88 {
89 int *bof;
90
91 fn->bufsize = WAV_OUTBUF_SIZE;
92 fn->buf = para_malloc(fn->bufsize);
93 fn->private_data = para_malloc(sizeof(int));
94 bof = fn->private_data;
95 fn->loaded = 0;
96 *bof = 1;
97 PARA_INFO_LOG("wav filter node: %p, output buffer: %p, loaded: %zd\n",
98 fn, fn->buf, fn->loaded);
99 }
100
101 /**
102 * the init function of the wav filter
103 *
104 * \param f struct to initialize
105 */
106 void wav_filter_init(struct filter *f)
107 {
108 f->convert = wav_convert;
109 f->close = wav_close;
110 f->open = wav_open;
111 }