647be101dc7e89e8b5fe73e12899f7e2520a083b
2 * Copyright (C) 2005-2006 Andre Noll <maan@systemlinux.org>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
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.
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, USA.
19 /** \file wav.c a filter that inserts a wave header */
21 #include "gcc-compat.h"
28 #define WAV_OUTBUF_SIZE 81920
29 #define WAV_HEADER_LEN 44
32 /* derived from oggdec.c of the vorbis-tools-1.0.1 package */
33 #define WRITE_U32(buf, x) (buf)[0] = (unsigned char)((x) & 0xff);\
34 (buf)[1] = (unsigned char)(((x) >> 8) & 0xff);\
35 (buf)[2] = (unsigned char)(((x) >> 16) & 0xff);\
36 (buf)[3] = (unsigned char)(((x) >> 24) & 0xff);
37 #define WRITE_U16(buf, x) (buf)[0] = (unsigned char)((x) & 0xff);
39 static void make_wav_header(int channels
, int samplerate
, struct filter_node
*fn
)
42 char *headbuf
= fn
->buf
;
43 unsigned int size
= 0x7fffffff;
44 int bytespersec
= channels
* samplerate
* BITS
/ 8;
45 int align
= channels
* BITS
/ 8;
47 PARA_DEBUG_LOG("writing wave header: %d channels, %d KHz\n", channels
, samplerate
);
48 memset(headbuf
, 0, WAV_HEADER_LEN
);
49 memcpy(headbuf
, "RIFF", 4);
50 WRITE_U32(headbuf
+ 4, size
- 8);
51 memcpy(headbuf
+ 8, "WAVE", 4);
52 memcpy(headbuf
+ 12, "fmt ", 4);
53 WRITE_U32(headbuf
+ 16, 16);
54 WRITE_U16(headbuf
+ 20, 1); /* format */
55 WRITE_U16(headbuf
+ 22, channels
);
56 WRITE_U32(headbuf
+ 24, samplerate
);
57 WRITE_U32(headbuf
+ 28, bytespersec
);
58 WRITE_U16(headbuf
+ 32, align
);
59 WRITE_U16(headbuf
+ 34, BITS
);
60 memcpy(headbuf
+ 36, "data", 4);
61 WRITE_U32(headbuf
+ 40, size
- 44);
64 static ssize_t
wav_convert(char *inbuf
, size_t len
, struct filter_node
*fn
)
67 int *bof
= fn
->private_data
;
70 make_wav_header(fn
->fci
->channels
, fn
->fci
->samplerate
, fn
);
71 fn
->loaded
= WAV_HEADER_LEN
;
75 copy
= MIN(len
, fn
->bufsize
- fn
->loaded
);
76 memmove(fn
->buf
+ fn
->loaded
, inbuf
, copy
);
78 // PARA_DEBUG_LOG("len = %d, copy = %d\n", len, copy);
82 static void wav_close(struct filter_node
*fn
)
86 free(fn
->private_data
);
87 fn
->private_data
= NULL
;
90 static void wav_open(struct filter_node
*fn
)
94 fn
->bufsize
= WAV_OUTBUF_SIZE
;
95 fn
->buf
= para_malloc(fn
->bufsize
);
96 fn
->private_data
= para_malloc(sizeof(int));
97 bof
= fn
->private_data
;
99 PARA_DEBUG_LOG("wav filter node: %p, output buffer: %p, loaded: %d\n",
100 fn
, fn
->buf
, fn
->loaded
);
103 void wav_init(struct filter
*f
)
105 f
->convert
= wav_convert
;
106 f
->close
= wav_close
;