Mon Oct 8 12:39:22 2012

Asterisk developer's documentation


format_g719.c File Reference

ITU G.719 , 64kbps bitrate only. More...

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

Go to the source code of this file.

Defines

#define BUF_SIZE   160
#define BYTES_TO_SAMPLES(x)   ((typeof(x)) x * ((float) 960 / 160))
#define SAMPLES_TO_BYTES(x)   ((typeof(x)) x / ((float) 960 / 160))

Functions

static void __reg_module (void)
static void __unreg_module (void)
static struct ast_frameg719read (struct ast_filestream *s, int *whennext)
static int g719seek (struct ast_filestream *fs, off_t sample_offset, int whence)
static off_t g719tell (struct ast_filestream *fs)
static int g719trunc (struct ast_filestream *fs)
static int g719write (struct ast_filestream *fs, struct ast_frame *f)
static int load_module (void)
static int unload_module (void)

Variables

static struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "ITU G.719" , .key = "This paragraph is copyright (c) 2006 by Digium, Inc. \In order for your module to load, it must return this \key via a function called \"key\". Any code which \includes this paragraph must be licensed under the GNU \General Public License version 2 or later (at your \option). In addition to Digium's general reservations \of rights, Digium expressly reserves the right to \allow other parties to license this paragraph under \different terms. Any use of Digium, Inc. trademarks or \logos (including \"Asterisk\" or \"Digium\") without \express written permission of Digium, Inc. is prohibited.\n" , .buildopt_sum = "ac1f6a56484a8820659555499174e588" , .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_APP_DEPEND }
static struct ast_module_infoast_module_info = &__mod_info
static struct ast_format g719_f


Detailed Description

ITU G.719 , 64kbps bitrate only.

Definition in file format_g719.c.


Define Documentation

#define BUF_SIZE   160

Definition at line 38 of file format_g719.c.

Referenced by g719read(), g729_read(), g729_seek(), g729_tell(), gen_prios(), h263_read(), h264_read(), ogg_vorbis_read(), pcm_read(), pcm_seek(), siren14read(), siren7read(), slinear_read(), and vox_read().

#define BYTES_TO_SAMPLES (  )     ((typeof(x)) x * ((float) 960 / 160))

Definition at line 40 of file format_g719.c.

Referenced by g719read(), g719tell(), siren14read(), siren14tell(), siren7read(), and siren7tell().

#define SAMPLES_TO_BYTES (  )     ((typeof(x)) x / ((float) 960 / 160))

Definition at line 39 of file format_g719.c.

Referenced by g719seek(), siren14seek(), and siren7seek().


Function Documentation

static void __reg_module ( void   )  [static]

Definition at line 166 of file format_g719.c.

static void __unreg_module ( void   )  [static]

Definition at line 166 of file format_g719.c.

static struct ast_frame* g719read ( struct ast_filestream s,
int *  whennext 
) [static]

Definition at line 42 of file format_g719.c.

References AST_FORMAT_G719, AST_FRAME_SET_BUFFER, AST_FRAME_VOICE, AST_FRIENDLY_OFFSET, ast_log(), ast_filestream::buf, BUF_SIZE, BYTES_TO_SAMPLES, ast_frame_subclass::codec, ast_frame::data, ast_frame::datalen, errno, ast_filestream::f, ast_filestream::fr, ast_frame::frametype, LOG_WARNING, ast_frame::mallocd, ast_frame::ptr, ast_frame::samples, and ast_frame::subclass.

00043 {
00044    int res;
00045    /* Send a frame from the file to the appropriate channel */
00046 
00047    s->fr.frametype = AST_FRAME_VOICE;
00048    s->fr.subclass.codec = AST_FORMAT_G719;
00049    s->fr.mallocd = 0;
00050    AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, BUF_SIZE);
00051    if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) != s->fr.datalen) {
00052       if (res)
00053          ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
00054       return NULL;
00055    }
00056    *whennext = s->fr.samples = BYTES_TO_SAMPLES(res);
00057    return &s->fr;
00058 }

static int g719seek ( struct ast_filestream fs,
off_t  sample_offset,
int  whence 
) [static]

Definition at line 79 of file format_g719.c.

References ast_log(), AST_LOG_WARNING, errno, ast_filestream::f, ast_frame::offset, SAMPLES_TO_BYTES, and SEEK_FORCECUR.

00080 {
00081    off_t offset = 0, min = 0, cur, max;
00082 
00083    sample_offset = SAMPLES_TO_BYTES(sample_offset);
00084 
00085    if ((cur = ftello(fs->f)) < 0) {
00086       ast_log(AST_LOG_WARNING, "Unable to determine current position in g719 filestream %p: %s\n", fs, strerror(errno));
00087       return -1;
00088    }
00089 
00090    if (fseeko(fs->f, 0, SEEK_END) < 0) {
00091       ast_log(AST_LOG_WARNING, "Unable to seek to end of g719 filestream %p: %s\n", fs, strerror(errno));
00092       return -1;
00093    }
00094 
00095    if ((max = ftello(fs->f)) < 0) {
00096       ast_log(AST_LOG_WARNING, "Unable to determine max position in g719 filestream %p: %s\n", fs, strerror(errno));
00097       return -1;
00098    }
00099 
00100    if (whence == SEEK_SET)
00101       offset = sample_offset;
00102    else if (whence == SEEK_CUR || whence == SEEK_FORCECUR)
00103       offset = sample_offset + cur;
00104    else if (whence == SEEK_END)
00105       offset = max - sample_offset;
00106 
00107    if (whence != SEEK_FORCECUR)
00108       offset = (offset > max) ? max : offset;
00109 
00110    /* always protect against seeking past begining. */
00111    offset = (offset < min) ? min : offset;
00112 
00113    return fseeko(fs->f, offset, SEEK_SET);
00114 }

static off_t g719tell ( struct ast_filestream fs  )  [static]

Definition at line 132 of file format_g719.c.

References BYTES_TO_SAMPLES, and ast_filestream::f.

00133 {
00134    return BYTES_TO_SAMPLES(ftello(fs->f));
00135 }

static int g719trunc ( struct ast_filestream fs  )  [static]

Definition at line 116 of file format_g719.c.

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

00117 {
00118    int fd;
00119    off_t cur;
00120 
00121    if ((fd = fileno(fs->f)) < 0) {
00122       ast_log(AST_LOG_WARNING, "Unable to determine file descriptor for g719 filestream %p: %s\n", fs, strerror(errno));
00123       return -1;
00124    }
00125    if ((cur = ftello(fs->f)) < 0) {
00126       ast_log(AST_LOG_WARNING, "Unable to determine current position in g719 filestream %p: %s\n", fs, strerror(errno));
00127       return -1;
00128    }
00129    return ftruncate(fd, cur);
00130 }

static int g719write ( struct ast_filestream fs,
struct ast_frame f 
) [static]

Definition at line 60 of file format_g719.c.

References AST_FORMAT_G719, AST_FRAME_VOICE, ast_getformatname(), ast_log(), errno, ast_filestream::f, f, and LOG_WARNING.

00061 {
00062    int res;
00063 
00064    if (f->frametype != AST_FRAME_VOICE) {
00065       ast_log(LOG_WARNING, "Asked to write non-voice frame!\n");
00066       return -1;
00067    }
00068    if (f->subclass.codec != AST_FORMAT_G719) {
00069       ast_log(LOG_WARNING, "Asked to write non-G.719 frame (%s)!\n", ast_getformatname(f->subclass.codec));
00070       return -1;
00071    }
00072    if ((res = fwrite(f->data.ptr, 1, f->datalen, fs->f)) != f->datalen) {
00073       ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n", res, f->datalen, strerror(errno));
00074       return -1;
00075    }
00076    return 0;
00077 }

static int load_module ( void   )  [static]

Definition at line 149 of file format_g719.c.

References ast_format_register, AST_MODULE_LOAD_DECLINE, AST_MODULE_LOAD_SUCCESS, and g719_f.

00150 {
00151    if (ast_format_register(&g719_f))
00152       return AST_MODULE_LOAD_DECLINE;
00153 
00154    return AST_MODULE_LOAD_SUCCESS;
00155 }

static int unload_module ( void   )  [static]

Definition at line 157 of file format_g719.c.

References ast_format_unregister(), g719_f, and ast_format::name.

00158 {
00159    return ast_format_unregister(g719_f.name);
00160 }


Variable Documentation

struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "ITU G.719" , .key = "This paragraph is copyright (c) 2006 by Digium, Inc. \In order for your module to load, it must return this \key via a function called \"key\". Any code which \includes this paragraph must be licensed under the GNU \General Public License version 2 or later (at your \option). In addition to Digium's general reservations \of rights, Digium expressly reserves the right to \allow other parties to license this paragraph under \different terms. Any use of Digium, Inc. trademarks or \logos (including \"Asterisk\" or \"Digium\") without \express written permission of Digium, Inc. is prohibited.\n" , .buildopt_sum = "ac1f6a56484a8820659555499174e588" , .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_APP_DEPEND } [static]

Definition at line 166 of file format_g719.c.

struct ast_module_info* ast_module_info = &__mod_info [static]

Definition at line 166 of file format_g719.c.

struct ast_format g719_f [static]

Definition at line 137 of file format_g719.c.

Referenced by load_module(), and unload_module().


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