asterisk/formats/format_wav.c

573 lines
14 KiB
C

/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 1999 - 2005, Digium, Inc.
*
* Mark Spencer <markster@digium.com>
*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2. See the LICENSE file
* at the top of the source tree.
*/
/*! \file
*
* \brief Work with WAV in the proprietary Microsoft format.
* Microsoft WAV format (8000hz Signed Linear)
* \arg File name extension: wav (lower case)
* \ingroup formats
*/
/*** MODULEINFO
<support_level>core</support_level>
***/
#include "asterisk.h"
#include "asterisk/mod_format.h"
#include "asterisk/module.h"
#include "asterisk/endian.h"
#include "asterisk/format_cache.h"
#include "asterisk/format.h"
#include "asterisk/codec.h"
/* Some Ideas for this code came from makewave.c by Jeffrey Chilton */
/* Portions of the conversion code are by guido@sienanet.it */
#define WAV_BUF_SIZE 320
#define WAV_HEADER_SIZE 44
struct wav_desc { /* format-specific parameters */
int hz;
int bytes;
int lasttimeout;
int maxlen;
struct timeval last;
};
#define BLOCKSIZE 160
#if __BYTE_ORDER == __LITTLE_ENDIAN
#define htoll(b) (b)
#define htols(b) (b)
#define ltohl(b) (b)
#define ltohs(b) (b)
#else
#if __BYTE_ORDER == __BIG_ENDIAN
#define htoll(b) \
(((((b) ) & 0xFF) << 24) | \
((( (b) >> 8) & 0xFF) << 16) | \
((( (b) >> 16) & 0xFF) << 8) | \
((( (b) >> 24) & 0xFF) ))
#define htols(b) \
(((((b) ) & 0xFF) << 8) | \
((( (b) >> 8) & 0xFF) ))
#define ltohl(b) htoll(b)
#define ltohs(b) htols(b)
#else
#error "Endianess not defined"
#endif
#endif
static int check_header_fmt(FILE *f, int hsize, int hz)
{
unsigned short format, chans, bysam, bisam;
unsigned int freq, bysec;
if (hsize < 16) {
ast_log(LOG_WARNING, "Unexpected header size %d\n", hsize);
return -1;
}
if (fread(&format, 1, 2, f) != 2) {
ast_log(LOG_WARNING, "Read failed (format)\n");
return -1;
}
if (ltohs(format) != 1) {
ast_log(LOG_WARNING, "Not a supported wav file format (%d). Only PCM encoded, 16 bit, mono, 8kHz/16kHz files are supported with a lowercase '.wav' extension.\n", ltohs(format));
return -1;
}
if (fread(&chans, 1, 2, f) != 2) {
ast_log(LOG_WARNING, "Read failed (format)\n");
return -1;
}
if (ltohs(chans) != 1) {
ast_log(LOG_WARNING, "Not in mono %d\n", ltohs(chans));
return -1;
}
if (fread(&freq, 1, 4, f) != 4) {
ast_log(LOG_WARNING, "Read failed (freq)\n");
return -1;
}
freq = ltohl(freq);
if ((freq != 8000 && freq != 16000) || freq != hz) {
ast_log(LOG_WARNING, "Unexpected frequency mismatch %d (expecting %d)\n", freq, hz);
return -1;
}
/* Ignore the byte frequency */
if (fread(&bysec, 1, 4, f) != 4) {
ast_log(LOG_WARNING, "Read failed (BYTES_PER_SECOND)\n");
return -1;
}
/* Check bytes per sample */
if (fread(&bysam, 1, 2, f) != 2) {
ast_log(LOG_WARNING, "Read failed (BYTES_PER_SAMPLE)\n");
return -1;
}
if (ltohs(bysam) != 2) {
ast_log(LOG_WARNING, "Can only handle 16bits per sample: %d\n", ltohs(bysam));
return -1;
}
if (fread(&bisam, 1, 2, f) != 2) {
ast_log(LOG_WARNING, "Read failed (Bits Per Sample): %d\n", ltohs(bisam));
return -1;
}
/* Skip any additional header */
if (fseek(f,hsize-16,SEEK_CUR) == -1 ) {
ast_log(LOG_WARNING, "Failed to skip remaining header bytes: %d\n", hsize-16 );
return -1;
}
return 0;
}
static int check_header(FILE *f, int hz)
{
int type, size, formtype;
int data;
if (fread(&type, 1, 4, f) != 4) {
ast_log(LOG_WARNING, "Read failed (type)\n");
return -1;
}
if (fread(&size, 1, 4, f) != 4) {
ast_log(LOG_WARNING, "Read failed (size)\n");
return -1;
}
#if __BYTE_ORDER == __BIG_ENDIAN
size = ltohl(size);
#endif
if (fread(&formtype, 1, 4, f) != 4) {
ast_log(LOG_WARNING, "Read failed (formtype)\n");
return -1;
}
if (memcmp(&type, "RIFF", 4)) {
ast_log(LOG_WARNING, "Does not begin with RIFF\n");
return -1;
}
if (memcmp(&formtype, "WAVE", 4)) {
ast_log(LOG_WARNING, "Does not contain WAVE\n");
return -1;
}
/* Skip any facts and get the first data block */
for(;;)
{
char buf[4];
/* Begin data chunk */
if (fread(&buf, 1, 4, f) != 4) {
ast_log(LOG_WARNING, "Read failed (block header format)\n");
return -1;
}
/* Data has the actual length of data in it */
if (fread(&data, 1, 4, f) != 4) {
ast_log(LOG_WARNING, "Read failed (block '%.4s' header length)\n", buf);
return -1;
}
#if __BYTE_ORDER == __BIG_ENDIAN
data = ltohl(data);
#endif
if (memcmp(&buf, "fmt ", 4) == 0) {
if (check_header_fmt(f, data, hz))
return -1;
continue;
}
if(memcmp(buf, "data", 4) == 0 )
break;
ast_log(LOG_DEBUG, "Skipping unknown block '%.4s'\n", buf);
if (fseek(f,data,SEEK_CUR) == -1 ) {
ast_log(LOG_WARNING, "Failed to skip '%.4s' block: %d\n", buf, data);
return -1;
}
}
#if 0
curpos = lseek(fd, 0, SEEK_CUR);
truelength = lseek(fd, 0, SEEK_END);
lseek(fd, curpos, SEEK_SET);
truelength -= curpos;
#endif
return data;
}
static int update_header(FILE *f)
{
off_t cur,end;
int datalen,filelen,bytes;
cur = ftello(f);
fseek(f, 0, SEEK_END);
end = ftello(f);
/* data starts 44 bytes in */
bytes = end - 44;
datalen = htoll(bytes);
/* chunk size is bytes of data plus 36 bytes of header */
filelen = htoll(36 + bytes);
if (cur < 0) {
ast_log(LOG_WARNING, "Unable to find our position\n");
return -1;
}
if (fseek(f, 4, SEEK_SET)) {
ast_log(LOG_WARNING, "Unable to set our position\n");
return -1;
}
if (fwrite(&filelen, 1, 4, f) != 4) {
ast_log(LOG_WARNING, "Unable to set write file size\n");
return -1;
}
if (fseek(f, 40, SEEK_SET)) {
ast_log(LOG_WARNING, "Unable to set our position\n");
return -1;
}
if (fwrite(&datalen, 1, 4, f) != 4) {
ast_log(LOG_WARNING, "Unable to set write datalen\n");
return -1;
}
if (fseeko(f, cur, SEEK_SET)) {
ast_log(LOG_WARNING, "Unable to return to position\n");
return -1;
}
return 0;
}
static int write_header(FILE *f, int writehz)
{
unsigned int hz;
unsigned int bhz;
unsigned int hs = htoll(16);
unsigned short fmt = htols(1);
unsigned short chans = htols(1);
unsigned short bysam = htols(2);
unsigned short bisam = htols(16);
unsigned int size = htoll(0);
if (writehz == 16000) {
hz = htoll(16000);
bhz = htoll(32000);
} else {
hz = htoll(8000);
bhz = htoll(16000);
}
/* Write a wav header, ignoring sizes which will be filled in later */
fseek(f,0,SEEK_SET);
if (fwrite("RIFF", 1, 4, f) != 4) {
ast_log(LOG_WARNING, "Unable to write header\n");
return -1;
}
if (fwrite(&size, 1, 4, f) != 4) {
ast_log(LOG_WARNING, "Unable to write header\n");
return -1;
}
if (fwrite("WAVEfmt ", 1, 8, f) != 8) {
ast_log(LOG_WARNING, "Unable to write header\n");
return -1;
}
if (fwrite(&hs, 1, 4, f) != 4) {
ast_log(LOG_WARNING, "Unable to write header\n");
return -1;
}
if (fwrite(&fmt, 1, 2, f) != 2) {
ast_log(LOG_WARNING, "Unable to write header\n");
return -1;
}
if (fwrite(&chans, 1, 2, f) != 2) {
ast_log(LOG_WARNING, "Unable to write header\n");
return -1;
}
if (fwrite(&hz, 1, 4, f) != 4) {
ast_log(LOG_WARNING, "Unable to write header\n");
return -1;
}
if (fwrite(&bhz, 1, 4, f) != 4) {
ast_log(LOG_WARNING, "Unable to write header\n");
return -1;
}
if (fwrite(&bysam, 1, 2, f) != 2) {
ast_log(LOG_WARNING, "Unable to write header\n");
return -1;
}
if (fwrite(&bisam, 1, 2, f) != 2) {
ast_log(LOG_WARNING, "Unable to write header\n");
return -1;
}
if (fwrite("data", 1, 4, f) != 4) {
ast_log(LOG_WARNING, "Unable to write header\n");
return -1;
}
if (fwrite(&size, 1, 4, f) != 4) {
ast_log(LOG_WARNING, "Unable to write header\n");
return -1;
}
return 0;
}
static int wav_open(struct ast_filestream *s)
{
/* We don't have any header to read or anything really, but
if we did, it would go here. We also might want to check
and be sure it's a valid file. */
struct wav_desc *tmp = s->_private;
unsigned int sample_rate = ast_format_get_sample_rate(s->fmt->format);
tmp->maxlen = check_header(s->f, sample_rate);
if (tmp->maxlen < 0) {
return -1;
}
tmp->hz = sample_rate;
return 0;
}
static int wav_rewrite(struct ast_filestream *s, const char *comment)
{
/* We don't have any header to read or anything really, but
if we did, it would go here. We also might want to check
and be sure it's a valid file. */
struct wav_desc *tmp = (struct wav_desc *)s->_private;
tmp->hz = ast_format_get_sample_rate(s->fmt->format);
if (write_header(s->f,tmp->hz))
return -1;
return 0;
}
static void wav_close(struct ast_filestream *s)
{
char zero = 0;
struct wav_desc *fs = (struct wav_desc *)s->_private;
if (s->mode == O_RDONLY) {
return;
}
if (s->filename) {
update_header(s->f);
}
/* Pad to even length */
if (fs->bytes & 0x1) {
if (fwrite(&zero, 1, 1, s->f) != 1) {
ast_log(LOG_WARNING, "fwrite() failed: %s\n", strerror(errno));
}
}
}
static struct ast_frame *wav_read(struct ast_filestream *s, int *whennext)
{
size_t res;
int samples; /* actual samples read */
#if __BYTE_ORDER == __BIG_ENDIAN
int x;
short *tmp;
#endif
int bytes;
off_t here;
/* Send a frame from the file to the appropriate channel */
struct wav_desc *fs = (struct wav_desc *)s->_private;
bytes = (fs->hz == 16000 ? (WAV_BUF_SIZE * 2) : WAV_BUF_SIZE);
here = ftello(s->f);
if (fs->maxlen - here < bytes) /* truncate if necessary */
bytes = fs->maxlen - here;
if (bytes <= 0) {
return NULL;
}
/* ast_debug(1, "here: %d, maxlen: %d, bytes: %d\n", here, s->maxlen, bytes); */
AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, bytes);
if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) == 0) {
if (res) {
ast_log(LOG_WARNING, "Short read of %s data (expected %d bytes, read %zu): %s\n",
ast_format_get_name(s->fr.subclass.format), s->fr.datalen, res,
strerror(errno));
}
return NULL;
}
s->fr.datalen = res;
s->fr.samples = samples = res / 2;
#if __BYTE_ORDER == __BIG_ENDIAN
tmp = (short *)(s->fr.data.ptr);
/* file format is little endian so we need to swap */
for( x = 0; x < samples; x++)
tmp[x] = (tmp[x] << 8) | ((tmp[x] & 0xff00) >> 8);
#endif
*whennext = samples;
return &s->fr;
}
static int wav_write(struct ast_filestream *fs, struct ast_frame *f)
{
#if __BYTE_ORDER == __BIG_ENDIAN
int x;
short tmp[16000], *tmpi;
#endif
struct wav_desc *s = (struct wav_desc *)fs->_private;
int res;
if (!f->datalen)
return -1;
#if __BYTE_ORDER == __BIG_ENDIAN
/* swap and write */
if (f->datalen > sizeof(tmp)) {
ast_log(LOG_WARNING, "Data length is too long\n");
return -1;
}
tmpi = f->data.ptr;
for (x=0; x < f->datalen/2; x++)
tmp[x] = (tmpi[x] << 8) | ((tmpi[x] & 0xff00) >> 8);
if ((res = fwrite(tmp, 1, f->datalen, fs->f)) != f->datalen ) {
#else
/* just write */
if ((res = fwrite(f->data.ptr, 1, f->datalen, fs->f)) != f->datalen ) {
#endif
ast_log(LOG_WARNING, "Bad write (%d): %s\n", res, strerror(errno));
return -1;
}
s->bytes += f->datalen;
return 0;
}
static int wav_seek(struct ast_filestream *fs, off_t sample_offset, int whence)
{
off_t min = WAV_HEADER_SIZE, max, cur, offset = 0, samples;
samples = sample_offset * 2; /* SLINEAR is 16 bits mono, so sample_offset * 2 = bytes */
if ((cur = ftello(fs->f)) < 0) {
ast_log(AST_LOG_WARNING, "Unable to determine current position in wav filestream %p: %s\n", fs, strerror(errno));
return -1;
}
if (fseeko(fs->f, 0, SEEK_END) < 0) {
ast_log(AST_LOG_WARNING, "Unable to seek to end of wav filestream %p: %s\n", fs, strerror(errno));
return -1;
}
if ((max = ftello(fs->f)) < 0) {
ast_log(AST_LOG_WARNING, "Unable to determine max position in wav filestream %p: %s\n", fs, strerror(errno));
return -1;
}
if (whence == SEEK_SET) {
offset = samples + min;
} else if (whence == SEEK_CUR || whence == SEEK_FORCECUR) {
offset = samples + cur;
} else if (whence == SEEK_END) {
offset = max - samples;
}
if (whence != SEEK_FORCECUR) {
offset = (offset > max)?max:offset;
}
/* always protect the header space. */
offset = (offset < min)?min:offset;
return fseeko(fs->f, offset, SEEK_SET);
}
static int wav_trunc(struct ast_filestream *fs)
{
int fd;
off_t cur;
if ((fd = fileno(fs->f)) < 0) {
ast_log(AST_LOG_WARNING, "Unable to determine file descriptor for wav filestream %p: %s\n", fs, strerror(errno));
return -1;
}
if ((cur = ftello(fs->f)) < 0) {
ast_log(AST_LOG_WARNING, "Unable to determine current position in wav filestream %p: %s\n", fs, strerror(errno));
return -1;
}
/* Truncate file to current length */
if (ftruncate(fd, cur)) {
return -1;
}
return update_header(fs->f);
}
static off_t wav_tell(struct ast_filestream *fs)
{
off_t offset;
offset = ftello(fs->f);
/* subtract header size to get samples, then divide by 2 for 16 bit samples */
return (offset - 44)/2;
}
static struct ast_format_def wav16_f = {
.name = "wav16",
.exts = "wav16",
.mime_types = "audio/x-wav;codec=pcm;bit=16;rate=16000",
.open = wav_open,
.rewrite = wav_rewrite,
.write = wav_write,
.seek = wav_seek,
.trunc = wav_trunc,
.tell = wav_tell,
.read = wav_read,
.close = wav_close,
.buf_size = (WAV_BUF_SIZE * 2) + AST_FRIENDLY_OFFSET,
.desc_size = sizeof(struct wav_desc),
};
static struct ast_format_def wav_f = {
.name = "wav",
.exts = "wav",
.mime_types = "audio/wav|audio/x-wav|audio/x-wav;codec=pcm;bit=16;rate=8000",
.open = wav_open,
.rewrite = wav_rewrite,
.write = wav_write,
.seek = wav_seek,
.trunc = wav_trunc,
.tell = wav_tell,
.read = wav_read,
.close = wav_close,
.buf_size = WAV_BUF_SIZE + AST_FRIENDLY_OFFSET,
.desc_size = sizeof(struct wav_desc),
};
static int unload_module(void)
{
return ast_format_def_unregister(wav_f.name)
|| ast_format_def_unregister(wav16_f.name);
}
static int load_module(void)
{
wav_f.format = ast_format_slin;
wav16_f.format = ast_format_slin16;
if (ast_format_def_register(&wav_f)
|| ast_format_def_register(&wav16_f)) {
unload_module();
return AST_MODULE_LOAD_DECLINE;
}
return AST_MODULE_LOAD_SUCCESS;
}
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "Microsoft WAV/WAV16 format (8kHz/16kHz Signed Linear)",
.support_level = AST_MODULE_SUPPORT_CORE,
.load = load_module,
.unload = unload_module,
.load_pri = AST_MODPRI_APP_DEPEND
);