format_pcm.c File Reference

Flat, binary, ulaw PCM file format. More...

#include "asterisk.h"
#include "asterisk/mod_format.h"
#include "asterisk/module.h"
#include "asterisk/endian.h"
#include "asterisk/ulaw.h"
#include "asterisk/alaw.h"
#include "asterisk/format_cache.h"

Include dependency graph for format_pcm.c:

Go to the source code of this file.

Data Structures
struct	au_desc

Macros
#define	AU_ENC_8BIT_ULAW   1
#define	AU_HDR_CHANNELS_OFF   5
#define	AU_HDR_DATA_SIZE_OFF   2
#define	AU_HDR_ENCODING_OFF   3
#define	AU_HDR_HDR_SIZE_OFF   1
#define	AU_HDR_MAGIC_OFF   0
#define	AU_HDR_SAMPLE_RATE_OFF   4
#define	AU_HEADER(var)   uint32_t var[6]
#define	AU_MAGIC   0x2e736e64
#define	BUF_SIZE   160 /* 160 bytes, and same number of samples */
#define	htoll(b)   (b)
#define	htols(b)   (b)
#define	ltohl(b)   (b)
#define	ltohs(b)   (b)
#define	MIN_AU_HEADER_SIZE   24

Functions
static void	__reg_module (void)
static void	__unreg_module (void)
struct ast_module *	AST_MODULE_SELF_SYM (void)
static int	au_open (struct ast_filestream *s)
static int	au_rewrite (struct ast_filestream *s, const char *comment)
static int	au_seek (struct ast_filestream *fs, off_t sample_offset, int whence)
static off_t	au_tell (struct ast_filestream *fs)
static int	au_trunc (struct ast_filestream *fs)
static int	check_header (struct ast_filestream *fs)
static struct ast_frame *	g722_read (struct ast_filestream *s, int *whennext)
static int	g722_seek (struct ast_filestream *fs, off_t sample_offset, int whence)
static off_t	g722_tell (struct ast_filestream *fs)
static int	load_module (void)
static struct ast_frame *	pcm_read (struct ast_filestream *s, int *whennext)
static int	pcm_seek (struct ast_filestream *fs, off_t sample_offset, int whence)
static off_t	pcm_tell (struct ast_filestream *fs)
static int	pcm_trunc (struct ast_filestream *fs)
static int	pcm_write (struct ast_filestream *fs, struct ast_frame *f)
static int	unload_module (void)
static int	update_header (struct ast_filestream *fs)
static int	write_header (struct ast_filestream *fs)

Variables
static struct ast_module_info	__mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "Raw/Sun uLaw/ALaw 8KHz (PCM,PCMA,AU), G.722 16Khz" , .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 struct ast_format_def	alaw_f
static char	alaw_silence [BUF_SIZE]
static const struct ast_module_info *	ast_module_info = &__mod_info
static struct ast_format_def	au_f
static struct ast_format_def	g722_f
static struct ast_format_def	pcm_f
static char	ulaw_silence [BUF_SIZE]

Detailed Description

Flat, binary, ulaw PCM file format.

• File name extension: alaw, al, alw, pcm, ulaw, ul, mu, ulw, g722, au

Definition in file format_pcm.c.

Macro Definition Documentation

AU_ENC_8BIT_ULAW

#define AU_ENC_8BIT_ULAW   1

Definition at line 247 of file format_pcm.c.

AU_HDR_CHANNELS_OFF

#define AU_HDR_CHANNELS_OFF   5

Definition at line 245 of file format_pcm.c.

AU_HDR_DATA_SIZE_OFF

#define AU_HDR_DATA_SIZE_OFF   2

Definition at line 242 of file format_pcm.c.

AU_HDR_ENCODING_OFF

#define AU_HDR_ENCODING_OFF   3

Definition at line 243 of file format_pcm.c.

AU_HDR_HDR_SIZE_OFF

#define AU_HDR_HDR_SIZE_OFF   1

Definition at line 241 of file format_pcm.c.

AU_HDR_MAGIC_OFF

#define AU_HDR_MAGIC_OFF   0

Definition at line 240 of file format_pcm.c.

AU_HDR_SAMPLE_RATE_OFF

#define AU_HDR_SAMPLE_RATE_OFF   4

Definition at line 244 of file format_pcm.c.

AU_HEADER

#define AU_HEADER

(

var

)

uint32_t var[6]

Definition at line 238 of file format_pcm.c.

AU_MAGIC

#define AU_MAGIC   0x2e736e64

Definition at line 249 of file format_pcm.c.

BUF_SIZE

#define BUF_SIZE   160 /* 160 bytes, and same number of samples */

Definition at line 40 of file format_pcm.c.

htoll

#define htoll

(

b

)

(b)

Definition at line 251 of file format_pcm.c.

htols

#define htols

(

b

)

(b)

Definition at line 252 of file format_pcm.c.

ltohl

#define ltohl

(

b

)

(b)

Definition at line 253 of file format_pcm.c.

ltohs

#define ltohs

(

b

)

(b)

Definition at line 254 of file format_pcm.c.

MIN_AU_HEADER_SIZE

#define MIN_AU_HEADER_SIZE   24

Definition at line 237 of file format_pcm.c.

Function Documentation

__reg_module()

static void __reg_module ( void  )

static

Definition at line 581 of file format_pcm.c.

__unreg_module()

static void __unreg_module ( void  )

static

Definition at line 581 of file format_pcm.c.

AST_MODULE_SELF_SYM()

struct ast_module * AST_MODULE_SELF_SYM

(

void

)

Definition at line 581 of file format_pcm.c.

au_open()

static int au_open ( struct ast_filestream *  s )

static

Definition at line 388 of file format_pcm.c.

{
    if (check_header(s) < 0)
        return -1;
    return 0;
}

References check_header().

au_rewrite()

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

static

Definition at line 395 of file format_pcm.c.

{
    struct au_desc *desc = s->_private;
 
    desc->hdr_size = MIN_AU_HEADER_SIZE;
 
    if (write_header(s))
        return -1;
    return 0;
}

References ast_filestream::_private, desc, MIN_AU_HEADER_SIZE, and write_header().

au_seek()

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

static

Definition at line 407 of file format_pcm.c.

{
    off_t min, max, cur;
    long offset = 0;
    struct au_desc *desc = fs->_private;
 
    min = desc->hdr_size;
 
    if ((cur = ftello(fs->f)) < 0) {
        ast_log(AST_LOG_WARNING, "Unable to determine current position in au 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 au 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 au filestream %p: %s\n", fs, strerror(errno));
        return -1;
    }
 
    if (whence == SEEK_SET)
        offset = sample_offset + min;
    else if (whence == SEEK_CUR || whence == SEEK_FORCECUR)
        offset = sample_offset + cur;
    else if (whence == SEEK_END)
        offset = max - sample_offset;
 
    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);
}

References ast_filestream::_private, ast_log, AST_LOG_WARNING, desc, errno, ast_filestream::f, max, min, and SEEK_FORCECUR.

au_tell()

static off_t au_tell ( struct ast_filestream *  fs )

static

Definition at line 467 of file format_pcm.c.

{
    struct au_desc *desc = fs->_private;
    off_t offset = ftello(fs->f);
    return offset - desc->hdr_size;
}

References ast_filestream::_private, desc, and ast_filestream::f.

au_trunc()

static int au_trunc ( struct ast_filestream *  fs )

static

Definition at line 447 of file format_pcm.c.

{
    int fd;
    off_t cur;
 
    if ((fd = fileno(fs->f)) < 0) {
        ast_log(AST_LOG_WARNING, "Unable to determine file descriptor for au 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 au filestream %p: %s\n", fs, strerror(errno));
        return -1;
    }
    /* Truncate file to current length */
    if (ftruncate(fd, cur)) {
        return -1;
    }
    return update_header(fs);
}

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

check_header()

static int check_header ( struct ast_filestream *  fs )

static

Definition at line 276 of file format_pcm.c.

{
    AU_HEADER(header);
    uint32_t magic;
    uint32_t hdr_size;
    uint32_t data_size;
    uint32_t encoding;
    uint32_t sample_rate;
    uint32_t channels;
 
    struct au_desc *desc = fs->_private;
    FILE *f = fs->f;
 
    if (fread(header, 1, MIN_AU_HEADER_SIZE, f) != MIN_AU_HEADER_SIZE) {
        ast_log(LOG_WARNING, "Read failed (header)\n");
        return -1;
    }
    magic = ltohl(header[AU_HDR_MAGIC_OFF]);
    if (magic != (uint32_t) AU_MAGIC) {
        ast_log(LOG_WARNING, "Bad magic: 0x%x\n", magic);
    }
    hdr_size = ltohl(header[AU_HDR_HDR_SIZE_OFF]);
    if (hdr_size < MIN_AU_HEADER_SIZE) {
        hdr_size = MIN_AU_HEADER_SIZE;
    }
/*  data_size = ltohl(header[AU_HDR_DATA_SIZE_OFF]); */
    encoding = ltohl(header[AU_HDR_ENCODING_OFF]);
    if (encoding != AU_ENC_8BIT_ULAW) {
        ast_log(LOG_WARNING, "Unexpected format: %u. Only 8bit ULAW allowed (%d)\n", encoding, AU_ENC_8BIT_ULAW);
        return -1;
    }
    sample_rate = ltohl(header[AU_HDR_SAMPLE_RATE_OFF]);
    if (sample_rate != DEFAULT_SAMPLE_RATE) {
        ast_log(LOG_WARNING, "Sample rate can only be 8000 not %u\n", sample_rate);
        return -1;
    }
    channels = ltohl(header[AU_HDR_CHANNELS_OFF]);
    if (channels != 1) {
        ast_log(LOG_WARNING, "Not in mono: channels=%u\n", channels);
        return -1;
    }
    /* Skip to data */
    fseek(f, 0, SEEK_END);
    data_size = ftell(f) - hdr_size;
    if (fseek(f, hdr_size, SEEK_SET) == -1 ) {
        ast_log(LOG_WARNING, "Failed to skip to data: %u\n", hdr_size);
        return -1;
    }
 
    /* We'll need this later */
    desc->hdr_size = hdr_size;
 
    return data_size;
}

References ast_filestream::_private, ast_log, AU_ENC_8BIT_ULAW, AU_HDR_CHANNELS_OFF, AU_HDR_ENCODING_OFF, AU_HDR_HDR_SIZE_OFF, AU_HDR_MAGIC_OFF, AU_HDR_SAMPLE_RATE_OFF, AU_HEADER, AU_MAGIC, channels, DEFAULT_SAMPLE_RATE, desc, encoding, ast_filestream::f, au_desc::hdr_size, LOG_WARNING, ltohl, and MIN_AU_HEADER_SIZE.

Referenced by au_open().

g722_read()

static struct ast_frame * g722_read ( struct ast_filestream *  s, int *  whennext  )

static

Definition at line 474 of file format_pcm.c.

{
    struct ast_frame *f = pcm_read(s, whennext);
    *whennext = s->fr.samples = (*whennext * 2);
    return f;
}

References ast_filestream::fr, pcm_read(), and ast_frame::samples.

g722_seek()

static int g722_seek ( struct ast_filestream *  fs, off_t  sample_offset, int  whence  )

static

Definition at line 481 of file format_pcm.c.

{
    return pcm_seek(fs, sample_offset / 2, whence);
}

References pcm_seek().

g722_tell()

static off_t g722_tell ( struct ast_filestream *  fs )

static

Definition at line 486 of file format_pcm.c.

{
    return pcm_tell(fs) * 2;
}

References pcm_tell().

load_module()

static int load_module ( void  )

static

Definition at line 552 of file format_pcm.c.

{
    int i;
 
    /* XXX better init ? */
    for (i = 0; i < ARRAY_LEN(ulaw_silence); i++)
        ulaw_silence[i] = AST_LIN2MU(0);
    for (i = 0; i < ARRAY_LEN(alaw_silence); i++)
        alaw_silence[i] = AST_LIN2A(0);
 
    pcm_f.format = ast_format_ulaw;
    alaw_f.format = ast_format_alaw;
    au_f.format = ast_format_ulaw;
    g722_f.format = ast_format_g722;
    if ( ast_format_def_register(&pcm_f)
        || ast_format_def_register(&alaw_f)
        || ast_format_def_register(&au_f)
        || ast_format_def_register(&g722_f) ) {
        unload_module();
        return AST_MODULE_LOAD_DECLINE;
    }
    return AST_MODULE_LOAD_SUCCESS;
}

References alaw_f, alaw_silence, ARRAY_LEN, ast_format_alaw, ast_format_def_register, ast_format_g722, ast_format_ulaw, AST_LIN2A, AST_LIN2MU, AST_MODULE_LOAD_DECLINE, AST_MODULE_LOAD_SUCCESS, au_f, ast_format_def::format, g722_f, pcm_f, ulaw_silence, and unload_module().

pcm_read()

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

static

Definition at line 79 of file format_pcm.c.

{
    size_t res;
 
    /* Send a frame from the file to the appropriate channel */
    AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, BUF_SIZE);
    if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) < 1) {
        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;
    *whennext = s->fr.samples = res;
    return &s->fr;
}

References ast_format_get_name(), AST_FRAME_SET_BUFFER, AST_FRIENDLY_OFFSET, ast_log, ast_filestream::buf, BUF_SIZE, ast_frame::data, ast_frame::datalen, errno, ast_filestream::f, ast_frame_subclass::format, ast_filestream::fr, LOG_WARNING, NULL, ast_frame::ptr, ast_frame::samples, and ast_frame::subclass.

Referenced by g722_read().

pcm_seek()

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

static

Definition at line 98 of file format_pcm.c.

{
    off_t cur, max, offset = 0;
    int ret = -1;   /* assume error */
 
    if ((cur = ftello(fs->f)) < 0) {
        ast_log(AST_LOG_WARNING, "Unable to determine current position in pcm 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 pcm 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 pcm filestream %p: %s\n", fs, strerror(errno));
        return -1;
    }
 
    switch (whence) {
    case SEEK_SET:
        offset = sample_offset;
        break;
    case SEEK_END:
        offset = max - sample_offset;
        break;
    case SEEK_CUR:
    case SEEK_FORCECUR:
        offset = cur + sample_offset;
        break;
    default:
        ast_log(LOG_WARNING, "invalid whence %d, assuming SEEK_SET\n", whence);
        offset = sample_offset;
    }
    if (offset < 0) {
        ast_log(LOG_WARNING, "negative offset %ld, resetting to 0\n", (long) offset);
        offset = 0;
    }
    if (whence == SEEK_FORCECUR && offset > max) { /* extend the file */
        size_t left = offset - max;
        const char *src = (ast_format_cmp(fs->fmt->format, ast_format_alaw) == AST_FORMAT_CMP_EQUAL) ? alaw_silence : ulaw_silence;
 
        while (left) {
            size_t written = fwrite(src, 1, MIN(left, BUF_SIZE), fs->f);
            if (written < MIN(left, BUF_SIZE)) {
                break;  /* error */
            }
            left -= written;
        }
        ret = 0; /* successful */
    } else {
        if (offset > max) {
            ast_log(LOG_WARNING, "offset too large %ld, truncating to %ld\n", (long) offset, (long) max);
            offset = max;
        }
        ret = fseeko(fs->f, offset, SEEK_SET);
    }
    return ret;
}

References alaw_silence, ast_format_alaw, ast_format_cmp(), AST_FORMAT_CMP_EQUAL, ast_log, AST_LOG_WARNING, BUF_SIZE, errno, ast_filestream::f, ast_filestream::fmt, ast_format_def::format, LOG_WARNING, max, MIN, ast_frame::offset, SEEK_FORCECUR, ast_frame::src, and ulaw_silence.

Referenced by g722_seek().

pcm_tell()

static off_t pcm_tell ( struct ast_filestream *  fs )

static

Definition at line 175 of file format_pcm.c.

{
    return ftello(fs->f);
}

References ast_filestream::f.

Referenced by g722_tell().

pcm_trunc()

static int pcm_trunc ( struct ast_filestream *  fs )

static

Definition at line 159 of file format_pcm.c.

{
    int cur, fd;
 
    if ((fd = fileno(fs->f)) < 0) {
        ast_log(AST_LOG_WARNING, "Unable to determine file descriptor for pcm 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 pcm filestream %p: %s\n", fs, strerror(errno));
        return -1;
    }
    /* Truncate file to current length */
    return ftruncate(fd, cur);
}

References ast_log, AST_LOG_WARNING, errno, and ast_filestream::f.

pcm_write()

static int pcm_write ( struct ast_filestream *  fs, struct ast_frame *  f  )

static

Definition at line 180 of file format_pcm.c.

{
    int res;
 
#ifdef REALTIME_WRITE
    if (ast_format_cmp(s->fmt->format, ast_format_alaw) == AST_FORMAT_CMP_EQUAL) {
        struct pcm_desc *pd = (struct pcm_desc *)fs->_private;
        struct stat stat_buf;
        unsigned long cur_time = get_time();
        unsigned long fpos = ( cur_time - pd->start_time ) * 8; /* 8 bytes per msec */
        /* Check if we have written to this position yet. If we have, then increment pos by one frame
        *  for some degree of protection against receiving packets in the same clock tick.
        */
 
        fstat(fileno(fs->f), &stat_buf );
        if (stat_buf.st_size > fpos )
            fpos += f->datalen; /* Incrementing with the size of this current frame */
 
        if (stat_buf.st_size < fpos) {
            /* fill the gap with 0x55 rather than 0. */
            char buf[1024];
            unsigned long cur, to_write;
 
            cur = stat_buf.st_size;
            if (fseek(fs->f, cur, SEEK_SET) < 0) {
                ast_log( LOG_WARNING, "Cannot seek in file: %s\n", strerror(errno) );
                return -1;
            }
            memset(buf, 0x55, 512);
            while (cur < fpos) {
                to_write = fpos - cur;
                if (to_write > sizeof(buf))
                    to_write = sizeof(buf);
                if (fwrite(buf, 1, to_write, fs->f) != to_write) {
                    ast_log(LOG_ERROR, "Failed to write to file: %s\n", strerror(errno));
                    return -1;
                }
                cur += to_write;
            }
        }
 
        if (fseek(s->f, fpos, SEEK_SET) < 0) {
            ast_log( LOG_WARNING, "Cannot seek in file: %s\n", strerror(errno) );
            return -1;
        }
    }
#endif  /* REALTIME_WRITE */
 
    if ((res = fwrite(f->data.ptr, 1, f->datalen, fs->f)) != f->datalen) {
        ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n", res, f->datalen, strerror(errno));
        return -1;
    }
    return 0;
}

References ast_filestream::_private, ast_format_alaw, ast_format_cmp(), AST_FORMAT_CMP_EQUAL, ast_log, buf, ast_frame::data, ast_frame::datalen, errno, ast_filestream::f, ast_filestream::fmt, ast_format_def::format, LOG_ERROR, LOG_WARNING, and ast_frame::ptr.

unload_module()

static int unload_module ( void  )

static

Definition at line 544 of file format_pcm.c.

{
    return ast_format_def_unregister(pcm_f.name)
        || ast_format_def_unregister(alaw_f.name)
        || ast_format_def_unregister(au_f.name)
        || ast_format_def_unregister(g722_f.name);
}

References alaw_f, ast_format_def_unregister(), au_f, g722_f, ast_format_def::name, and pcm_f.

Referenced by load_module().

update_header()

static int update_header ( struct ast_filestream *  fs )

static

Definition at line 331 of file format_pcm.c.

{
    off_t cur, end;
    uint32_t datalen;
    int bytes;
    struct au_desc *desc = fs->_private;
    FILE *f = fs->f;
 
    cur = ftell(f);
    fseek(f, 0, SEEK_END);
    end = ftell(f);
    /* data starts 24 bytes in */
    bytes = end - desc->hdr_size;
    datalen = htoll(bytes);
 
    if (cur < 0) {
        ast_log(LOG_WARNING, "Unable to find our position\n");
        return -1;
    }
    if (fseek(f, AU_HDR_DATA_SIZE_OFF * sizeof(uint32_t), SEEK_SET)) {
        ast_log(LOG_WARNING, "Unable to set our position\n");
        return -1;
    }
    if (fwrite(&datalen, 1, sizeof(datalen), f) != sizeof(datalen)) {
        ast_log(LOG_WARNING, "Unable to set write file size\n");
        return -1;
    }
    if (fseek(f, cur, SEEK_SET)) {
        ast_log(LOG_WARNING, "Unable to return to position\n");
        return -1;
    }
    return 0;
}

References ast_filestream::_private, ast_log, AU_HDR_DATA_SIZE_OFF, desc, end, ast_filestream::f, htoll, and LOG_WARNING.

Referenced by au_trunc().

write_header()

static int write_header ( struct ast_filestream *  fs )

static

Definition at line 365 of file format_pcm.c.

{
    struct au_desc *desc = fs->_private;
    FILE *f = fs->f;
 
    AU_HEADER(header);
 
    header[AU_HDR_MAGIC_OFF] = htoll((uint32_t) AU_MAGIC);
    header[AU_HDR_HDR_SIZE_OFF] = htoll(desc->hdr_size);
    header[AU_HDR_DATA_SIZE_OFF] = 0;
    header[AU_HDR_ENCODING_OFF] = htoll(AU_ENC_8BIT_ULAW);
    header[AU_HDR_SAMPLE_RATE_OFF] = htoll(DEFAULT_SAMPLE_RATE);
    header[AU_HDR_CHANNELS_OFF] = htoll(1);
 
    /* Write an au header, ignoring sizes which will be filled in later */
    fseek(f, 0, SEEK_SET);
    if (fwrite(header, 1, MIN_AU_HEADER_SIZE, f) != MIN_AU_HEADER_SIZE) {
        ast_log(LOG_WARNING, "Unable to write header\n");
        return -1;
    }
    return 0;
}

References ast_filestream::_private, ast_log, AU_ENC_8BIT_ULAW, AU_HDR_CHANNELS_OFF, AU_HDR_DATA_SIZE_OFF, AU_HDR_ENCODING_OFF, AU_HDR_HDR_SIZE_OFF, AU_HDR_MAGIC_OFF, AU_HDR_SAMPLE_RATE_OFF, AU_HEADER, AU_MAGIC, DEFAULT_SAMPLE_RATE, desc, ast_filestream::f, htoll, LOG_WARNING, and MIN_AU_HEADER_SIZE.

Referenced by au_rewrite().

Variable Documentation

__mod_info

struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "Raw/Sun uLaw/ALaw 8KHz (PCM,PCMA,AU), G.722 16Khz" , .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 581 of file format_pcm.c.

alaw_f

struct ast_format_def alaw_f

static

Definition at line 491 of file format_pcm.c.

                                      {
    .name = "alaw",
    .exts = "alaw|al|alw",
    .write = pcm_write,
    .seek = pcm_seek,
    .trunc = pcm_trunc,
    .tell = pcm_tell,
    .read = pcm_read,
    .buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET,
#ifdef REALTIME_WRITE
    .open = pcma_open,
    .rewrite = pcma_rewrite,
    .desc_size = sizeof(struct pcm_desc),
#endif
};

Referenced by load_module(), and unload_module().

alaw_silence

char alaw_silence[BUF_SIZE]

static

Definition at line 43 of file format_pcm.c.

Referenced by load_module(), and pcm_seek().

ast_module_info

const struct ast_module_info* ast_module_info = &__mod_info

static

Definition at line 581 of file format_pcm.c.

au_f

struct ast_format_def au_f

static

Definition at line 530 of file format_pcm.c.

                                    {
    .name = "au",
    .exts = "au",
    .open = au_open,
    .rewrite = au_rewrite,
    .write = pcm_write,
    .seek = au_seek,
    .trunc = au_trunc,
    .tell = au_tell,
    .read = pcm_read,
    .buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET, /* this many shorts */
    .desc_size = sizeof(struct au_desc),
};

Referenced by load_module(), and unload_module().

g722_f

struct ast_format_def g722_f

static

Definition at line 519 of file format_pcm.c.

                                      {
    .name = "g722",
    .exts = "g722",
    .write = pcm_write,
    .seek = g722_seek,
    .trunc = pcm_trunc,
    .tell = g722_tell,
    .read = g722_read,
    .buf_size = (BUF_SIZE * 2) + AST_FRIENDLY_OFFSET,
};

Referenced by load_module(), and unload_module().

pcm_f

struct ast_format_def pcm_f

static

Definition at line 507 of file format_pcm.c.

                                     {
    .name = "pcm",
    .exts = "pcm|ulaw|ul|mu|ulw",
    .mime_types = "audio/basic",
    .write = pcm_write,
    .seek = pcm_seek,
    .trunc = pcm_trunc,
    .tell = pcm_tell,
    .read = pcm_read,
    .buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET,
};

Referenced by load_module(), and unload_module().

ulaw_silence

char ulaw_silence[BUF_SIZE]

static

Definition at line 42 of file format_pcm.c.

Referenced by load_module(), and pcm_seek().