format_wav_gsm.c File Reference

Save GSM in the proprietary Microsoft format. More...

#include "asterisk.h"
#include "asterisk/mod_format.h"
#include "asterisk/module.h"
#include "asterisk/endian.h"
#include "asterisk/format_cache.h"
#include "msgsm.h"

Include dependency graph for format_wav_gsm.c:

Go to the source code of this file.

Data Structures
struct	wavg_desc

Macros
#define	GSM_FRAME_SIZE   33
#define	GSM_SAMPLES   160 /* samples in a GSM block */
#define	htoll(b)   (b)
#define	htols(b)   (b)
#define	ltohl(b)   (b)
#define	ltohs(b)   (b)
#define	MSGSM_DATA_OFFSET   60 /* offset of data bytes */
#define	MSGSM_FRAME_SIZE   65
#define	MSGSM_SAMPLES   (2*GSM_SAMPLES) /* samples in an MSGSM block */

Functions
static void	__reg_module (void)
static void	__unreg_module (void)
struct ast_module *	AST_MODULE_SELF_SYM (void)
static int	check_header (FILE *f)
static int	load_module (void)
static int	unload_module (void)
static int	update_header (FILE *f)
static void	wav_close (struct ast_filestream *s)
static int	wav_open (struct ast_filestream *s)
static struct ast_frame *	wav_read (struct ast_filestream *s, int *whennext)
static int	wav_rewrite (struct ast_filestream *s, const char *comment)
static int	wav_seek (struct ast_filestream *fs, off_t sample_offset, int whence)
static off_t	wav_tell (struct ast_filestream *fs)
static int	wav_trunc (struct ast_filestream *fs)
static int	wav_write (struct ast_filestream *s, struct ast_frame *f)
static int	write_header (FILE *f)

Variables
static struct ast_module_info	__mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "Microsoft WAV format (Proprietary GSM)" , .key = ASTERISK_GPL_KEY , .buildopt_sum = AST_BUILDOPT_SUM, .support_level = AST_MODULE_SUPPORT_CORE, .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_APP_DEPEND }
static const struct ast_module_info *	ast_module_info = &__mod_info
static char	msgsm_silence []
static struct ast_format_def	wav49_f

Detailed Description

Save GSM in the proprietary Microsoft format.

Microsoft WAV format (Proprietary GSM)

• File name extension: WAV,wav49 (Upper case WAV, lower case is another format) This format can be played on Windows systems, used for e-mail attachments mainly.

Definition in file format_wav_gsm.c.

Macro Definition Documentation

GSM_FRAME_SIZE

#define GSM_FRAME_SIZE   33

Definition at line 47 of file format_wav_gsm.c.

GSM_SAMPLES

#define GSM_SAMPLES   160 /* samples in a GSM block */

Definition at line 50 of file format_wav_gsm.c.

htoll

#define htoll

(

b

)

(b)

Definition at line 69 of file format_wav_gsm.c.

htols

#define htols

(

b

)

(b)

Definition at line 70 of file format_wav_gsm.c.

ltohl

#define ltohl

(

b

)

(b)

Definition at line 71 of file format_wav_gsm.c.

ltohs

#define ltohs

(

b

)

(b)

Definition at line 72 of file format_wav_gsm.c.

MSGSM_DATA_OFFSET

#define MSGSM_DATA_OFFSET   60 /* offset of data bytes */

Definition at line 49 of file format_wav_gsm.c.

MSGSM_FRAME_SIZE

#define MSGSM_FRAME_SIZE   65

Definition at line 48 of file format_wav_gsm.c.

MSGSM_SAMPLES

#define MSGSM_SAMPLES   (2*GSM_SAMPLES) /* samples in an MSGSM block */

Definition at line 51 of file format_wav_gsm.c.

Function Documentation

__reg_module()

static void __reg_module ( void  )

static

Definition at line 588 of file format_wav_gsm.c.

__unreg_module()

static void __unreg_module ( void  )

static

Definition at line 588 of file format_wav_gsm.c.

AST_MODULE_SELF_SYM()

struct ast_module * AST_MODULE_SELF_SYM

(

void

)

Definition at line 588 of file format_wav_gsm.c.

check_header()

static int check_header ( FILE *  f )

static

Definition at line 91 of file format_wav_gsm.c.

{
    int type, size, formtype;
    int fmt, hsize, fact;
    short format, chans;
    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;
    }
#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;
    }
    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) != 20) {
        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) != 49) {
        ast_log(LOG_WARNING, "Not a GSM 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 frequency %d\n", ltohl(freq));
        return -1;
    }
    /* Ignore the byte frequency */
    if (fread(&freq, 1, 4, f) != 4) {
        ast_log(LOG_WARNING, "Read failed (X_1)\n");
        return -1;
    }
    /* Ignore the two weird fields */
    if (fread(&freq, 1, 4, f) != 4) {
        ast_log(LOG_WARNING, "Read failed (X_2/X_3)\n");
        return -1;
    }
    /* Ignore the byte frequency */
    if (fread(&freq, 1, 4, f) != 4) {
        ast_log(LOG_WARNING, "Read failed (Y_1)\n");
        return -1;
    }
    /* Check for the word fact */
    if (fread(&fact, 1, 4, f) != 4) {
        ast_log(LOG_WARNING, "Read failed (fact)\n");
        return -1;
    }
    if (memcmp(&fact, "fact", 4)) {
        ast_log(LOG_WARNING, "Does not say fact\n");
        return -1;
    }
    /* Ignore the "fact value" */
    if (fread(&fact, 1, 4, f) != 4) {
        ast_log(LOG_WARNING, "Read failed (fact header)\n");
        return -1;
    }
    if (fread(&fact, 1, 4, f) != 4) {
        ast_log(LOG_WARNING, "Read failed (fact value)\n");
        return -1;
    }
    /* Check for the word data */
    if (fread(&data, 1, 4, f) != 4) {
        ast_log(LOG_WARNING, "Read failed (data)\n");
        return -1;
    }
    if (memcmp(&data, "data", 4)) {
        ast_log(LOG_WARNING, "Does not say data\n");
        return -1;
    }
    /* Ignore the data length */
    if (fread(&data, 1, 4, f) != 4) {
        ast_log(LOG_WARNING, "Read failed (data)\n");
        return -1;
    }
    return 0;
}

References ast_log, DEFAULT_SAMPLE_RATE, LOG_WARNING, ltohl, ltohs, and type.

Referenced by wav_open().

load_module()

static int load_module ( void  )

static

Definition at line 570 of file format_wav_gsm.c.

{
    wav49_f.format = ast_format_gsm;
    if (ast_format_def_register(&wav49_f))
        return AST_MODULE_LOAD_DECLINE;
    return AST_MODULE_LOAD_SUCCESS;
}

References ast_format_def_register, ast_format_gsm, AST_MODULE_LOAD_DECLINE, AST_MODULE_LOAD_SUCCESS, ast_format_def::format, and wav49_f.

unload_module()

static int unload_module ( void  )

static

Definition at line 578 of file format_wav_gsm.c.

{
    return ast_format_def_unregister(wav49_f.name);
}

References ast_format_def_unregister(), ast_format_def::name, and wav49_f.

update_header()

static int update_header ( FILE *  f )

static

Definition at line 211 of file format_wav_gsm.c.

{
    off_t cur,end,bytes;
    int datalen, filelen, samples;
 
    cur = ftello(f);
    fseek(f, 0, SEEK_END);
    end = ftello(f);
    /* in a gsm WAV, data starts 60 bytes in */
    bytes = end - MSGSM_DATA_OFFSET;
    samples = htoll(bytes / MSGSM_FRAME_SIZE * MSGSM_SAMPLES);
    datalen = htoll(bytes);
    filelen = htoll(MSGSM_DATA_OFFSET - 8 + 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 write file size\n");
        return -1;
    }
    if (fseek(f, 48, SEEK_SET)) {
        ast_log(LOG_WARNING, "Unable to set our position\n");
        return -1;
    }
    if (fwrite(&samples, 1, 4, f) != 4) {
        ast_log(LOG_WARNING, "Unable to write samples\n");
        return -1;
    }
    if (fseek(f, 56, 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 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;
}

References ast_log, end, htoll, LOG_WARNING, MSGSM_DATA_OFFSET, MSGSM_FRAME_SIZE, and MSGSM_SAMPLES.

Referenced by wav_close(), and wav_trunc().

wav_close()

static void wav_close ( struct ast_filestream *  s )

static

Definition at line 397 of file format_wav_gsm.c.

{
    if (s->mode == O_RDONLY) {
        return;
    }
 
    if (s->filename) {
        update_header(s->f);
    }
}

References ast_filestream::f, ast_filestream::filename, ast_filestream::mode, and update_header().

wav_open()

static int wav_open ( struct ast_filestream *  s )

static

Definition at line 373 of file format_wav_gsm.c.

{
    /* 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 wavg_desc *fs = (struct wavg_desc *)s->_private;
 
    if (check_header(s->f))
        return -1;
    fs->secondhalf = 0; /* not strictly necessary */
    return 0;
}

References ast_filestream::_private, check_header(), ast_filestream::f, and wavg_desc::secondhalf.

wav_read()

static struct ast_frame * wav_read ( struct ast_filestream *  s, int *  whennext  )

static

Definition at line 408 of file format_wav_gsm.c.

{
    /* Send a frame from the file to the appropriate channel */
    struct wavg_desc *fs = (struct wavg_desc *)s->_private;
 
    s->fr.samples = GSM_SAMPLES;
    AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, GSM_FRAME_SIZE);
    if (fs->secondhalf) {
        /* Just return a frame based on the second GSM frame */
        s->fr.data.ptr = (char *)s->fr.data.ptr + GSM_FRAME_SIZE;
        s->fr.offset += GSM_FRAME_SIZE;
    } else {
        /* read and convert */
        unsigned char msdata[MSGSM_FRAME_SIZE];
        size_t res;
 
        if ((res = fread(msdata, 1, MSGSM_FRAME_SIZE, s->f)) != MSGSM_FRAME_SIZE) {
            if (res && res != 1) {
                ast_log(LOG_WARNING, "Short read of %s data (expected %d bytes, read %zu): %s\n",
                        ast_format_get_name(s->fr.subclass.format), MSGSM_FRAME_SIZE, res,
                        strerror(errno));
            }
            return NULL;
        }
        /* Convert from MS format to two real GSM frames */
        conv65(msdata, s->fr.data.ptr);
    }
    fs->secondhalf = !fs->secondhalf;
    *whennext = GSM_SAMPLES;
    return &s->fr;
}

References ast_filestream::_private, ast_format_get_name(), AST_FRAME_SET_BUFFER, AST_FRIENDLY_OFFSET, ast_log, ast_filestream::buf, conv65(), ast_frame::data, errno, ast_filestream::f, ast_frame_subclass::format, ast_filestream::fr, GSM_FRAME_SIZE, GSM_SAMPLES, LOG_WARNING, MSGSM_FRAME_SIZE, NULL, ast_frame::offset, ast_frame::ptr, ast_frame::samples, wavg_desc::secondhalf, and ast_frame::subclass.

wav_rewrite()

static int wav_rewrite ( struct ast_filestream *  s, const char *  comment  )

static

Definition at line 386 of file format_wav_gsm.c.

{
    /* 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;
}

References ast_filestream::f, and write_header().

wav_seek()

static int wav_seek ( struct ast_filestream *  fs, off_t  sample_offset, int  whence  )

static

Definition at line 478 of file format_wav_gsm.c.

{
    off_t offset = 0, min = MSGSM_DATA_OFFSET, distance, max, cur;
    struct wavg_desc *s = (struct wavg_desc *)fs->_private;
 
    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;
    }
 
    /* XXX ideally, should round correctly */
    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;
    }
 
    /* Compute the distance in bytes, rounded to the block size */
    distance = (sample_offset/MSGSM_SAMPLES) * MSGSM_FRAME_SIZE;
    if (whence == SEEK_SET)
        offset = distance + min;
    else if (whence == SEEK_CUR || whence == SEEK_FORCECUR)
        offset = distance + cur;
    else if (whence == SEEK_END)
        offset = max - distance;
    /* always protect against seeking past end of header */
    if (offset < min)
        offset = min;
    if (whence != SEEK_FORCECUR) {
        if (offset > max)
            offset = max;
    } else if (offset > max) {
        int i;
        fseek(fs->f, 0, SEEK_END);
        for (i=0; i< (offset - max) / MSGSM_FRAME_SIZE; i++) {
            if (fwrite(msgsm_silence, 1, MSGSM_FRAME_SIZE, fs->f) != MSGSM_FRAME_SIZE) {
                ast_log(LOG_WARNING, "fwrite() failed: %s\n", strerror(errno));
            }
        }
    }
    s->secondhalf = 0;
    return fseeko(fs->f, offset, SEEK_SET);
}

References ast_filestream::_private, ast_log, AST_LOG_WARNING, errno, ast_filestream::f, LOG_WARNING, max, min, MSGSM_DATA_OFFSET, MSGSM_FRAME_SIZE, MSGSM_SAMPLES, msgsm_silence, wavg_desc::secondhalf, and SEEK_FORCECUR.

wav_tell()

static off_t wav_tell ( struct ast_filestream *  fs )

static

Definition at line 546 of file format_wav_gsm.c.

{
    off_t offset;
    offset = ftello(fs->f);
    /* since this will most likely be used later in play or record, lets stick
     * to that level of resolution, just even frames boundaries */
    return (offset - MSGSM_DATA_OFFSET)/MSGSM_FRAME_SIZE*MSGSM_SAMPLES;
}

References ast_filestream::f, MSGSM_DATA_OFFSET, MSGSM_FRAME_SIZE, and MSGSM_SAMPLES.

wav_trunc()

static int wav_trunc ( struct ast_filestream *  fs )

static

Definition at line 526 of file format_wav_gsm.c.

{
    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);
}

References ast_log, AST_LOG_WARNING, errno, ast_filestream::f, and update_header().

wav_write()

static int wav_write ( struct ast_filestream *  s, struct ast_frame *  f  )

static

Definition at line 440 of file format_wav_gsm.c.

{
    int len;
    int size;
    struct wavg_desc *fs = (struct wavg_desc *)s->_private;
 
    /* XXX this might fail... if the input is a multiple of MSGSM_FRAME_SIZE
     * we assume it is already in the correct format.
     */
    if (!(f->datalen % MSGSM_FRAME_SIZE)) {
        size = MSGSM_FRAME_SIZE;
        fs->secondhalf = 0;
    } else {
        size = GSM_FRAME_SIZE;
    }
    for (len = 0; len < f->datalen ; len += size) {
        int res;
        unsigned char *src, msdata[MSGSM_FRAME_SIZE];
        if (fs->secondhalf) {   /* second half of raw gsm to be converted */
            memcpy(s->buf + GSM_FRAME_SIZE, f->data.ptr + len, GSM_FRAME_SIZE);
            conv66((unsigned char *) s->buf, msdata);
            src = msdata;
            fs->secondhalf = 0;
        } else if (size == GSM_FRAME_SIZE) {    /* first half of raw gsm */
            memcpy(s->buf, f->data.ptr + len, GSM_FRAME_SIZE);
            src = NULL; /* nothing to write */
            fs->secondhalf = 1;
        } else {    /* raw msgsm data */
            src = f->data.ptr + len;
        }
        if (src && (res = fwrite(src, 1, MSGSM_FRAME_SIZE, s->f)) != MSGSM_FRAME_SIZE) {
            ast_log(LOG_WARNING, "Bad write (%d/65): %s\n", res, strerror(errno));
            return -1;
        }
    }
    return 0;
}

References ast_filestream::_private, ast_log, ast_filestream::buf, conv66(), ast_frame::data, ast_frame::datalen, errno, ast_filestream::f, GSM_FRAME_SIZE, len(), LOG_WARNING, MSGSM_FRAME_SIZE, NULL, ast_frame::ptr, and wavg_desc::secondhalf.

write_header()

static int write_header ( FILE *  f )

static

Definition at line 259 of file format_wav_gsm.c.

{
    /* Samples per second (always 8000 for this format). */
    unsigned int sample_rate = htoll(8000);
    /* Bytes per second (always 1625 for this format). */
    unsigned int byte_sample_rate = htoll(1625);
    /* This is the size of the "fmt " subchunk */
    unsigned int fmtsize = htoll(20);
    /* WAV #49 */
    unsigned short fmt = htols(49);
    /* Mono = 1 channel */
    unsigned short chans = htols(1);
    /* Each block of data is exactly 65 bytes in size. */
    unsigned int block_align = htoll(MSGSM_FRAME_SIZE);
    /* Not actually 2, but rounded up to the nearest bit */
    unsigned short bits_per_sample = htols(2);
    /* Needed for compressed formats */
    unsigned short extra_format = htols(MSGSM_SAMPLES);
    /* This is the size of the "fact" subchunk */
    unsigned int factsize = htoll(4);
    /* Number of samples in the data chunk */
    unsigned int num_samples = htoll(0);
    /* Number of bytes in the data chunk */
    unsigned int size = htoll(0);
    /* Write a GSM header, ignoring sizes which will be filled in later */
 
    /*  0: Chunk ID */
    if (fwrite("RIFF", 1, 4, f) != 4) {
        ast_log(LOG_WARNING, "Unable to write header\n");
        return -1;
    }
    /*  4: Chunk Size */
    if (fwrite(&size, 1, 4, f) != 4) {
        ast_log(LOG_WARNING, "Unable to write header\n");
        return -1;
    }
    /*  8: Chunk Format */
    if (fwrite("WAVE", 1, 4, f) != 4) {
        ast_log(LOG_WARNING, "Unable to write header\n");
        return -1;
    }
    /* 12: Subchunk 1: ID */
    if (fwrite("fmt ", 1, 4, f) != 4) {
        ast_log(LOG_WARNING, "Unable to write header\n");
        return -1;
    }
    /* 16: Subchunk 1: Size (minus 8) */
    if (fwrite(&fmtsize, 1, 4, f) != 4) {
        ast_log(LOG_WARNING, "Unable to write header\n");
        return -1;
    }
    /* 20: Subchunk 1: Audio format (49) */
    if (fwrite(&fmt, 1, 2, f) != 2) {
        ast_log(LOG_WARNING, "Unable to write header\n");
        return -1;
    }
    /* 22: Subchunk 1: Number of channels */
    if (fwrite(&chans, 1, 2, f) != 2) {
        ast_log(LOG_WARNING, "Unable to write header\n");
        return -1;
    }
    /* 24: Subchunk 1: Sample rate */
    if (fwrite(&sample_rate, 1, 4, f) != 4) {
        ast_log(LOG_WARNING, "Unable to write header\n");
        return -1;
    }
    /* 28: Subchunk 1: Byte rate */
    if (fwrite(&byte_sample_rate, 1, 4, f) != 4) {
        ast_log(LOG_WARNING, "Unable to write header\n");
        return -1;
    }
    /* 32: Subchunk 1: Block align */
    if (fwrite(&block_align, 1, 4, f) != 4) {
        ast_log(LOG_WARNING, "Unable to write header\n");
        return -1;
    }
    /* 36: Subchunk 1: Bits per sample */
    if (fwrite(&bits_per_sample, 1, 2, f) != 2) {
        ast_log(LOG_WARNING, "Unable to write header\n");
        return -1;
    }
    /* 38: Subchunk 1: Extra format bytes */
    if (fwrite(&extra_format, 1, 2, f) != 2) {
        ast_log(LOG_WARNING, "Unable to write header\n");
        return -1;
    }
    /* 40: Subchunk 2: ID */
    if (fwrite("fact", 1, 4, f) != 4) {
        ast_log(LOG_WARNING, "Unable to write header\n");
        return -1;
    }
    /* 44: Subchunk 2: Size (minus 8) */
    if (fwrite(&factsize, 1, 4, f) != 4) {
        ast_log(LOG_WARNING, "Unable to write header\n");
        return -1;
    }
    /* 48: Subchunk 2: Number of samples */
    if (fwrite(&num_samples, 1, 4, f) != 4) {
        ast_log(LOG_WARNING, "Unable to write header\n");
        return -1;
    }
    /* 52: Subchunk 3: ID */
    if (fwrite("data", 1, 4, f) != 4) {
        ast_log(LOG_WARNING, "Unable to write header\n");
        return -1;
    }
    /* 56: Subchunk 3: Size */
    if (fwrite(&size, 1, 4, f) != 4) {
        ast_log(LOG_WARNING, "Unable to write header\n");
        return -1;
    }
    return 0;
}

References ast_log, htoll, htols, LOG_WARNING, MSGSM_FRAME_SIZE, and MSGSM_SAMPLES.

Referenced by wav_rewrite().

Variable Documentation

__mod_info

struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "Microsoft WAV format (Proprietary GSM)" , .key = ASTERISK_GPL_KEY , .buildopt_sum = AST_BUILDOPT_SUM, .support_level = AST_MODULE_SUPPORT_CORE, .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_APP_DEPEND }

static

Definition at line 588 of file format_wav_gsm.c.

ast_module_info

const struct ast_module_info* ast_module_info = &__mod_info

static

Definition at line 588 of file format_wav_gsm.c.

msgsm_silence

char msgsm_silence[]

static

Definition at line 54 of file format_wav_gsm.c.

{0x48,0x17,0xD6,0x84,0x02,0x80,0x24,0x49,0x92,0x24,0x89,0x02,0x80,0x24,0x49
,0x92,0x24,0x89,0x02,0x80,0x24,0x49,0x92,0x24,0x89,0x02,0x80,0x24,0x49,0x92
,0x24,0x09,0x82,0x74,0x61,0x4D,0x28,0x00,0x48,0x92,0x24,0x49,0x92,0x28,0x00
,0x48,0x92,0x24,0x49,0x92,0x28,0x00,0x48,0x92,0x24,0x49,0x92,0x28,0x00,0x48
,0x92,0x24,0x49,0x92,0x00};

Referenced by wav_seek().

wav49_f

struct ast_format_def wav49_f

static

Definition at line 555 of file format_wav_gsm.c.

                                       {
    .name = "wav49",
    .exts = "WAV|wav49",
    .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 = 2*GSM_FRAME_SIZE + AST_FRIENDLY_OFFSET,
    .desc_size = sizeof(struct wavg_desc),
};

Referenced by load_module(), and unload_module().