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-rw-r--r--formats/format_wav.c531
1 files changed, 531 insertions, 0 deletions
diff --git a/formats/format_wav.c b/formats/format_wav.c
new file mode 100644
index 000000000..a2acad87b
--- /dev/null
+++ b/formats/format_wav.c
@@ -0,0 +1,531 @@
+/*
+ * 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
+ */
+
+#include "asterisk.h"
+
+ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
+
+#include <unistd.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <stdlib.h>
+#include <sys/time.h>
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+
+#include "asterisk/lock.h"
+#include "asterisk/channel.h"
+#include "asterisk/file.h"
+#include "asterisk/logger.h"
+#include "asterisk/sched.h"
+#include "asterisk/module.h"
+#include "asterisk/endian.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
+
+struct wav_desc { /* format-specific parameters */
+ int bytes;
+ int needsgain;
+ int lasttimeout;
+ int maxlen;
+ struct timeval last;
+};
+
+#define BLOCKSIZE 160
+
+#define GAIN 0 /* 2^GAIN is the multiple to increase the volume by. The original value of GAIN was 2, or 4x (12 dB),
+ * but there were many reports of the clipping of loud signal peaks (issue 5823 for example). */
+
+#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(FILE *f)
+{
+ int type, size, formtype;
+ int fmt, hsize;
+ short format, chans, bysam, bisam;
+ int bysec;
+ int freq;
+ 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;
+ }
+ size = ltohl(size);
+ 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;
+ }
+ if (fread(&fmt, 1, 4, f) != 4) {
+ ast_log(LOG_WARNING, "Read failed (fmt)\n");
+ return -1;
+ }
+ if (memcmp(&fmt, "fmt ", 4)) {
+ ast_log(LOG_WARNING, "Does not say fmt\n");
+ return -1;
+ }
+ if (fread(&hsize, 1, 4, f) != 4) {
+ ast_log(LOG_WARNING, "Read failed (formtype)\n");
+ return -1;
+ }
+ if (ltohl(hsize) < 16) {
+ ast_log(LOG_WARNING, "Unexpected header size %d\n", ltohl(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 wav file %d\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;
+ }
+ if (ltohl(freq) != DEFAULT_SAMPLE_RATE) {
+ ast_log(LOG_WARNING, "Unexpected freqency %d\n", ltohl(freq));
+ 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,ltohl(hsize)-16,SEEK_CUR) == -1 ) {
+ ast_log(LOG_WARNING, "Failed to skip remaining header bytes: %d\n", ltohl(hsize)-16 );
+ 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 (data)\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 (data)\n");
+ return -1;
+ }
+ data = ltohl(data);
+ if(memcmp(buf, "data", 4) == 0 )
+ break;
+ if(memcmp(buf, "fact", 4) != 0 ) {
+ ast_log(LOG_WARNING, "Unknown block - not fact or data\n");
+ return -1;
+ }
+ if (fseek(f,data,SEEK_CUR) == -1 ) {
+ ast_log(LOG_WARNING, "Failed to skip fact block: %d\n", 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)
+{
+ unsigned int hz=htoll(8000);
+ unsigned int bhz = htoll(16000);
+ 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);
+ /* 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 = (struct wav_desc *)s->_private;
+ if ((tmp->maxlen = check_header(s->f)) < 0)
+ return -1;
+ 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. */
+
+ if (write_header(s->f))
+ return -1;
+ return 0;
+}
+
+static void wav_close(struct ast_filestream *s)
+{
+ char zero = 0;
+ struct wav_desc *fs = (struct wav_desc *)s->_private;
+ /* Pad to even length */
+ if (fs->bytes & 0x1) {
+ if (!fwrite(&zero, 1, 1, s->f)) {
+ ast_log(LOG_WARNING, "fwrite() failed: %s\n", strerror(errno));
+ }
+ }
+}
+
+static struct ast_frame *wav_read(struct ast_filestream *s, int *whennext)
+{
+ int res;
+ int samples; /* actual samples read */
+ int x;
+ short *tmp;
+ int bytes = WAV_BUF_SIZE; /* in bytes */
+ off_t here;
+ /* Send a frame from the file to the appropriate channel */
+ struct wav_desc *fs = (struct wav_desc *)s->_private;
+
+ here = ftello(s->f);
+ if (fs->maxlen - here < bytes) /* truncate if necessary */
+ bytes = fs->maxlen - here;
+ if (bytes < 0)
+ bytes = 0;
+/* ast_log(LOG_DEBUG, "here: %d, maxlen: %d, bytes: %d\n", here, s->maxlen, bytes); */
+ s->fr.frametype = AST_FRAME_VOICE;
+ s->fr.subclass = AST_FORMAT_SLINEAR;
+ s->fr.mallocd = 0;
+ AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, bytes);
+
+ if ( (res = fread(s->fr.data, 1, s->fr.datalen, s->f)) <= 0 ) {
+ if (res)
+ ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
+ return NULL;
+ }
+ s->fr.datalen = res;
+ s->fr.samples = samples = res / 2;
+
+ tmp = (short *)(s->fr.data);
+#if __BYTE_ORDER == __BIG_ENDIAN
+ /* 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
+
+ if (fs->needsgain) {
+ for (x=0; x < samples; x++) {
+ if (tmp[x] & ((1 << GAIN) - 1)) {
+ /* If it has data down low, then it's not something we've artificially increased gain
+ on, so we don't need to gain adjust it */
+ fs->needsgain = 0;
+ break;
+ }
+ }
+ if (fs->needsgain) {
+ for (x=0; x < samples; x++)
+ tmp[x] = tmp[x] >> GAIN;
+ }
+ }
+
+ *whennext = samples;
+ return &s->fr;
+}
+
+static int wav_write(struct ast_filestream *fs, struct ast_frame *f)
+{
+ int x;
+ short tmp[8000], *tmpi;
+ float tmpf;
+ struct wav_desc *s = (struct wav_desc *)fs->_private;
+ int res;
+
+ if (f->frametype != AST_FRAME_VOICE) {
+ ast_log(LOG_WARNING, "Asked to write non-voice frame!\n");
+ return -1;
+ }
+ if (f->subclass != AST_FORMAT_SLINEAR) {
+ ast_log(LOG_WARNING, "Asked to write non-SLINEAR frame (%d)!\n", f->subclass);
+ return -1;
+ }
+ if (f->datalen > sizeof(tmp)) {
+ ast_log(LOG_WARNING, "Data length is too long\n");
+ return -1;
+ }
+ if (!f->datalen)
+ return -1;
+
+#if 0
+ printf("Data Length: %d\n", f->datalen);
+#endif
+
+ tmpi = f->data;
+ /* Volume adjust here to accomodate */
+ for (x=0;x<f->datalen/2;x++) {
+ tmpf = ((float)tmpi[x]) * ((float)(1 << GAIN));
+ if (tmpf > 32767.0)
+ tmpf = 32767.0;
+ if (tmpf < -32768.0)
+ tmpf = -32768.0;
+ tmp[x] = tmpf;
+ tmp[x] &= ~((1 << GAIN) - 1);
+
+#if __BYTE_ORDER == __BIG_ENDIAN
+ tmp[x] = (tmp[x] << 8) | ((tmp[x] & 0xff00) >> 8);
+#endif
+
+ }
+ if ((res = fwrite(tmp, 1, f->datalen, fs->f)) != f->datalen ) {
+ ast_log(LOG_WARNING, "Bad write (%d): %s\n", res, strerror(errno));
+ return -1;
+ }
+
+ s->bytes += f->datalen;
+ update_header(fs->f);
+
+ return 0;
+
+}
+
+static int wav_seek(struct ast_filestream *fs, off_t sample_offset, int whence)
+{
+ off_t min, max, cur, offset = 0, samples;
+
+ samples = sample_offset * 2; /* SLINEAR is 16 bits mono, so sample_offset * 2 = bytes */
+ min = 44; /* wav header is 44 bytes */
+ cur = ftello(fs->f);
+ fseeko(fs->f, 0, SEEK_END);
+ max = ftello(fs->f);
+ 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)
+{
+ if (ftruncate(fileno(fs->f), ftello(fs->f)))
+ 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 const struct ast_format wav_f = {
+ .name = "wav",
+ .exts = "wav",
+ .format = AST_FORMAT_SLINEAR,
+ .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 load_module(void)
+{
+ return ast_format_register(&wav_f);
+}
+
+static int unload_module(void)
+{
+ return ast_format_unregister(wav_f.name);
+}
+
+AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Microsoft WAV format (8000Hz Signed Linear)");
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-16 10:45:37 +0000