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asterisk/main/frame.c

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/*
* 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 Frame and codec manipulation routines
*
* \author Mark Spencer <markster@digium.com>
*/
#include "asterisk.h"
ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
#include "asterisk/_private.h"
#include "asterisk/lock.h"
#include "asterisk/frame.h"
#include "asterisk/channel.h"
#include "asterisk/cli.h"
#include "asterisk/term.h"
#include "asterisk/utils.h"
#include "asterisk/threadstorage.h"
#include "asterisk/linkedlists.h"
#include "asterisk/translate.h"
#include "asterisk/dsp.h"
#ifdef TRACE_FRAMES
static int headers;
static AST_LIST_HEAD_STATIC(headerlist, ast_frame);
#endif
#if !defined(LOW_MEMORY)
static void frame_cache_cleanup(void *data);
/*! \brief A per-thread cache of frame headers */
AST_THREADSTORAGE_CUSTOM(frame_cache, NULL, frame_cache_cleanup);
/*!
* \brief Maximum ast_frame cache size
*
* In most cases where the frame header cache will be useful, the size
* of the cache will stay very small. However, it is not always the case that
* the same thread that allocates the frame will be the one freeing them, so
* sometimes a thread will never have any frames in its cache, or the cache
* will never be pulled from. For the latter case, we limit the maximum size.
*/
#define FRAME_CACHE_MAX_SIZE 10
/*! \brief This is just so ast_frames, a list head struct for holding a list of
* ast_frame structures, is defined. */
AST_LIST_HEAD_NOLOCK(ast_frames, ast_frame);
struct ast_frame_cache {
struct ast_frames list;
size_t size;
};
#endif
#define SMOOTHER_SIZE 8000
enum frame_type {
TYPE_HIGH, /* 0x0 */
TYPE_LOW, /* 0x1 */
TYPE_SILENCE, /* 0x2 */
TYPE_DONTSEND /* 0x3 */
};
#define TYPE_MASK 0x3
struct ast_smoother {
int size;
int format;
int readdata;
int flags;
float samplesperbyte;
struct ast_frame f;
struct timeval delivery;
char data[SMOOTHER_SIZE];
char framedata[SMOOTHER_SIZE + AST_FRIENDLY_OFFSET];
struct ast_frame *opt;
int len;
};
/*! \brief Definition of supported media formats (codecs) */
static struct ast_format_list AST_FORMAT_LIST[] = {
{ AST_FORMAT_G723_1 , "g723", 8000, "G.723.1", 20, 30, 300, 30, 30 }, /*!< G723.1 */
{ AST_FORMAT_GSM, "gsm", 8000, "GSM", 33, 20, 300, 20, 20 }, /*!< codec_gsm.c */
{ AST_FORMAT_ULAW, "ulaw", 8000, "G.711 u-law", 80, 10, 150, 10, 20 }, /*!< codec_ulaw.c */
{ AST_FORMAT_ALAW, "alaw", 8000, "G.711 A-law", 80, 10, 150, 10, 20 }, /*!< codec_alaw.c */
{ AST_FORMAT_G726, "g726", 8000, "G.726 RFC3551", 40, 10, 300, 10, 20 }, /*!< codec_g726.c */
{ AST_FORMAT_ADPCM, "adpcm" , 8000, "ADPCM", 40, 10, 300, 10, 20 }, /*!< codec_adpcm.c */
{ AST_FORMAT_SLINEAR, "slin", 8000, "16 bit Signed Linear PCM", 160, 10, 70, 10, 20, AST_SMOOTHER_FLAG_BE }, /*!< Signed linear */
{ AST_FORMAT_LPC10, "lpc10", 8000, "LPC10", 7, 20, 20, 20, 20 }, /*!< codec_lpc10.c */
{ AST_FORMAT_G729A, "g729", 8000, "G.729A", 10, 10, 230, 10, 20, AST_SMOOTHER_FLAG_G729 }, /*!< Binary commercial distribution */
{ AST_FORMAT_SPEEX, "speex", 8000, "SpeeX", 10, 10, 60, 10, 20 }, /*!< codec_speex.c */
{ AST_FORMAT_ILBC, "ilbc", 8000, "iLBC", 50, 30, 30, 30, 30 }, /*!< codec_ilbc.c */ /* inc=30ms - workaround */
{ AST_FORMAT_G726_AAL2, "g726aal2", 8000, "G.726 AAL2", 40, 10, 300, 10, 20 }, /*!< codec_g726.c */
{ AST_FORMAT_G722, "g722", 16000, "G722", 80, 10, 150, 10, 20 }, /*!< codec_g722.c */
{ AST_FORMAT_SLINEAR16, "slin16", 16000, "16 bit Signed Linear PCM (16kHz)", 320, 10, 70, 10, 20 }, /*!< Signed linear (16kHz) */
{ AST_FORMAT_JPEG, "jpeg", 0, "JPEG image"}, /*!< See format_jpeg.c */
{ AST_FORMAT_PNG, "png", 0, "PNG image"}, /*!< PNG Image format */
{ AST_FORMAT_H261, "h261", 0, "H.261 Video" }, /*!< H.261 Video Passthrough */
{ AST_FORMAT_H263, "h263", 0, "H.263 Video" }, /*!< H.263 Passthrough support, see format_h263.c */
{ AST_FORMAT_H263_PLUS, "h263p", 0, "H.263+ Video" }, /*!< H.263plus passthrough support See format_h263.c */
{ AST_FORMAT_H264, "h264", 0, "H.264 Video" }, /*!< Passthrough support, see format_h263.c */
{ AST_FORMAT_MP4_VIDEO, "mpeg4", 0, "MPEG4 Video" }, /*!< Passthrough support for MPEG4 */
{ AST_FORMAT_T140RED, "red", 1, "T.140 Realtime Text with redundancy"}, /*!< Redundant T.140 Realtime Text */
{ AST_FORMAT_T140, "t140", 0, "Passthrough T.140 Realtime Text" }, /*!< Passthrough support for T.140 Realtime Text */
};
struct ast_frame ast_null_frame = { AST_FRAME_NULL, };
void ast_smoother_reset(struct ast_smoother *s, int size)
{
memset(s, 0, sizeof(*s));
s->size = size;
}
struct ast_smoother *ast_smoother_new(int size)
{
struct ast_smoother *s;
if (size < 1)
return NULL;
if ((s = ast_malloc(sizeof(*s))))
ast_smoother_reset(s, size);
return s;
}
int ast_smoother_get_flags(struct ast_smoother *s)
{
return s->flags;
}
void ast_smoother_set_flags(struct ast_smoother *s, int flags)
{
s->flags = flags;
}
int ast_smoother_test_flag(struct ast_smoother *s, int flag)
{
return (s->flags & flag);
}
int __ast_smoother_feed(struct ast_smoother *s, struct ast_frame *f, int swap)
{
if (f->frametype != AST_FRAME_VOICE) {
ast_log(LOG_WARNING, "Huh? Can't smooth a non-voice frame!\n");
return -1;
}
if (!s->format) {
s->format = f->subclass;
s->samplesperbyte = (float)f->samples / (float)f->datalen;
} else if (s->format != f->subclass) {
ast_log(LOG_WARNING, "Smoother was working on %d format frames, now trying to feed %d?\n", s->format, f->subclass);
return -1;
}
if (s->len + f->datalen > SMOOTHER_SIZE) {
ast_log(LOG_WARNING, "Out of smoother space\n");
return -1;
}
if (((f->datalen == s->size) || ((f->datalen < 10) && (s->flags & AST_SMOOTHER_FLAG_G729)))
&& !s->opt && (f->offset >= AST_MIN_OFFSET)) {
if (!s->len) {
/* Optimize by sending the frame we just got
on the next read, thus eliminating the douple
copy */
if (swap)
ast_swapcopy_samples(f->data, f->data, f->samples);
s->opt = f;
return 0;
}
}
if (s->flags & AST_SMOOTHER_FLAG_G729) {
if (s->len % 10) {
ast_log(LOG_NOTICE, "Dropping extra frame of G.729 since we already have a VAD frame at the end\n");
return 0;
}
}
if (swap)
ast_swapcopy_samples(s->data+s->len, f->data, f->samples);
else
memcpy(s->data + s->len, f->data, f->datalen);
/* If either side is empty, reset the delivery time */
if (!s->len || ast_tvzero(f->delivery) || ast_tvzero(s->delivery)) /* XXX really ? */
s->delivery = f->delivery;
s->len += f->datalen;
return 0;
}
struct ast_frame *ast_smoother_read(struct ast_smoother *s)
{
struct ast_frame *opt;
int len;
/* IF we have an optimization frame, send it */
if (s->opt) {
if (s->opt->offset < AST_FRIENDLY_OFFSET)
ast_log(LOG_WARNING, "Returning a frame of inappropriate offset (%d).\n",
s->opt->offset);
opt = s->opt;
s->opt = NULL;
return opt;
}
/* Make sure we have enough data */
if (s->len < s->size) {
/* Or, if this is a G.729 frame with VAD on it, send it immediately anyway */
if (!((s->flags & AST_SMOOTHER_FLAG_G729) && (s->size % 10)))
return NULL;
}
len = s->size;
if (len > s->len)
len = s->len;
/* Make frame */
s->f.frametype = AST_FRAME_VOICE;
s->f.subclass = s->format;
s->f.data = s->framedata + AST_FRIENDLY_OFFSET;
s->f.offset = AST_FRIENDLY_OFFSET;
s->f.datalen = len;
/* Samples will be improper given VAD, but with VAD the concept really doesn't even exist */
s->f.samples = len * s->samplesperbyte; /* XXX rounding */
s->f.delivery = s->delivery;
/* Fill Data */
memcpy(s->f.data, s->data, len);
s->len -= len;
/* Move remaining data to the front if applicable */
if (s->len) {
/* In principle this should all be fine because if we are sending
G.729 VAD, the next timestamp will take over anyawy */
memmove(s->data, s->data + len, s->len);
if (!ast_tvzero(s->delivery)) {
/* If we have delivery time, increment it, otherwise, leave it at 0 */
s->delivery = ast_tvadd(s->delivery, ast_samp2tv(s->f.samples, 8000));
}
}
/* Return frame */
return &s->f;
}
void ast_smoother_free(struct ast_smoother *s)
{
ast_free(s);
}
static struct ast_frame *ast_frame_header_new(void)
{
struct ast_frame *f;
#if !defined(LOW_MEMORY)
struct ast_frame_cache *frames;
if ((frames = ast_threadstorage_get(&frame_cache, sizeof(*frames)))) {
if ((f = AST_LIST_REMOVE_HEAD(&frames->list, frame_list))) {
size_t mallocd_len = f->mallocd_hdr_len;
memset(f, 0, sizeof(*f));
f->mallocd_hdr_len = mallocd_len;
f->mallocd = AST_MALLOCD_HDR;
frames->size--;
return f;
}
}
if (!(f = ast_calloc_cache(1, sizeof(*f))))
return NULL;
#else
if (!(f = ast_calloc(1, sizeof(*f))))
return NULL;
#endif
f->mallocd_hdr_len = sizeof(*f);
#ifdef TRACE_FRAMES
AST_LIST_LOCK(&headerlist);
headers++;
AST_LIST_INSERT_HEAD(&headerlist, f, frame_list);
AST_LIST_UNLOCK(&headerlist);
#endif
return f;
}
#if !defined(LOW_MEMORY)
static void frame_cache_cleanup(void *data)
{
struct ast_frame_cache *frames = data;
struct ast_frame *f;
while ((f = AST_LIST_REMOVE_HEAD(&frames->list, frame_list)))
ast_free(f);
ast_free(frames);
}
#endif
void ast_frame_free(struct ast_frame *fr, int cache)
{
if (ast_test_flag(fr, AST_FRFLAG_FROM_TRANSLATOR))
ast_translate_frame_freed(fr);
else if (ast_test_flag(fr, AST_FRFLAG_FROM_DSP))
ast_dsp_frame_freed(fr);
if (!fr->mallocd)
return;
#if !defined(LOW_MEMORY)
if (cache && fr->mallocd == AST_MALLOCD_HDR) {
/* Cool, only the header is malloc'd, let's just cache those for now
* to keep things simple... */
struct ast_frame_cache *frames;
if ((frames = ast_threadstorage_get(&frame_cache, sizeof(*frames)))
&& frames->size < FRAME_CACHE_MAX_SIZE) {
AST_LIST_INSERT_HEAD(&frames->list, fr, frame_list);
frames->size++;
return;
}
}
#endif
if (fr->mallocd & AST_MALLOCD_DATA) {
if (fr->data)
ast_free(fr->data - fr->offset);
}
if (fr->mallocd & AST_MALLOCD_SRC) {
if (fr->src)
ast_free((char *)fr->src);
}
if (fr->mallocd & AST_MALLOCD_HDR) {
#ifdef TRACE_FRAMES
AST_LIST_LOCK(&headerlist);
headers--;
AST_LIST_REMOVE(&headerlist, fr, frame_list);
AST_LIST_UNLOCK(&headerlist);
#endif
ast_free(fr);
}
}
/*!
* \brief 'isolates' a frame by duplicating non-malloc'ed components
* (header, src, data).
* On return all components are malloc'ed
*/
struct ast_frame *ast_frisolate(struct ast_frame *fr)
{
struct ast_frame *out;
void *newdata;
ast_clear_flag(fr, AST_FRFLAG_FROM_TRANSLATOR);
ast_clear_flag(fr, AST_FRFLAG_FROM_DSP);
if (!(fr->mallocd & AST_MALLOCD_HDR)) {
/* Allocate a new header if needed */
if (!(out = ast_frame_header_new()))
return NULL;
out->frametype = fr->frametype;
out->subclass = fr->subclass;
out->datalen = fr->datalen;
out->samples = fr->samples;
out->offset = fr->offset;
out->data = fr->data;
/* Copy the timing data */
ast_copy_flags(out, fr, AST_FRFLAG_HAS_TIMING_INFO);
if (ast_test_flag(fr, AST_FRFLAG_HAS_TIMING_INFO)) {
out->ts = fr->ts;
out->len = fr->len;
out->seqno = fr->seqno;
}
} else
out = fr;
if (!(fr->mallocd & AST_MALLOCD_SRC)) {
if (fr->src) {
if (!(out->src = ast_strdup(fr->src))) {
if (out != fr)
ast_free(out);
return NULL;
}
}
} else
out->src = fr->src;
if (!(fr->mallocd & AST_MALLOCD_DATA)) {
if (!(newdata = ast_malloc(fr->datalen + AST_FRIENDLY_OFFSET))) {
if (out->src != fr->src)
ast_free((void *) out->src);
if (out != fr)
ast_free(out);
return NULL;
}
newdata += AST_FRIENDLY_OFFSET;
out->offset = AST_FRIENDLY_OFFSET;
out->datalen = fr->datalen;
memcpy(newdata, fr->data, fr->datalen);
out->data = newdata;
}
out->mallocd = AST_MALLOCD_HDR | AST_MALLOCD_SRC | AST_MALLOCD_DATA;
return out;
}
struct ast_frame *ast_frdup(const struct ast_frame *f)
{
struct ast_frame *out = NULL;
int len, srclen = 0;
void *buf = NULL;
#if !defined(LOW_MEMORY)
struct ast_frame_cache *frames;
#endif
/* Start with standard stuff */
len = sizeof(*out) + AST_FRIENDLY_OFFSET + f->datalen;
/* If we have a source, add space for it */
/*
* XXX Watch out here - if we receive a src which is not terminated
* properly, we can be easily attacked. Should limit the size we deal with.
*/
if (f->src)
srclen = strlen(f->src);
if (srclen > 0)
len += srclen + 1;
#if !defined(LOW_MEMORY)
if ((frames = ast_threadstorage_get(&frame_cache, sizeof(*frames)))) {
AST_LIST_TRAVERSE_SAFE_BEGIN(&frames->list, out, frame_list) {
if (out->mallocd_hdr_len >= len) {
size_t mallocd_len = out->mallocd_hdr_len;
AST_LIST_REMOVE_CURRENT(frame_list);
memset(out, 0, sizeof(*out));
out->mallocd_hdr_len = mallocd_len;
buf = out;
frames->size--;
break;
}
}
AST_LIST_TRAVERSE_SAFE_END;
}
#endif
if (!buf) {
if (!(buf = ast_calloc_cache(1, len)))
return NULL;
out = buf;
out->mallocd_hdr_len = len;
}
out->frametype = f->frametype;
out->subclass = f->subclass;
out->datalen = f->datalen;
out->samples = f->samples;
out->delivery = f->delivery;
/* Set us as having malloc'd header only, so it will eventually
get freed. */
out->mallocd = AST_MALLOCD_HDR;
out->offset = AST_FRIENDLY_OFFSET;
if (out->datalen) {
out->data = buf + sizeof(*out) + AST_FRIENDLY_OFFSET;
memcpy(out->data, f->data, out->datalen);
}
if (srclen > 0) {
out->src = buf + sizeof(*out) + AST_FRIENDLY_OFFSET + f->datalen;
/* Must have space since we allocated for it */
strcpy((char *)out->src, f->src);
}
ast_copy_flags(out, f, AST_FRFLAG_HAS_TIMING_INFO);
out->ts = f->ts;
out->len = f->len;
out->seqno = f->seqno;
return out;
}
void ast_swapcopy_samples(void *dst, const void *src, int samples)
{
int i;
unsigned short *dst_s = dst;
const unsigned short *src_s = src;
for (i = 0; i < samples; i++)
dst_s[i] = (src_s[i]<<8) | (src_s[i]>>8);
}
struct ast_format_list *ast_get_format_list_index(int index)
{
return &AST_FORMAT_LIST[index];
}
struct ast_format_list *ast_get_format_list(size_t *size)
{
*size = (sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]));
return AST_FORMAT_LIST;
}
char* ast_getformatname(int format)
{
int x;
char *ret = "unknown";
for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
if (AST_FORMAT_LIST[x].bits == format) {
ret = AST_FORMAT_LIST[x].name;
break;
}
}
return ret;
}
char *ast_getformatname_multiple(char *buf, size_t size, int format)
{
int x;
unsigned len;
char *start, *end = buf;
if (!size)
return buf;
snprintf(end, size, "0x%x (", format);
len = strlen(end);
end += len;
size -= len;
start = end;
for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
if (AST_FORMAT_LIST[x].bits & format) {
snprintf(end, size,"%s|",AST_FORMAT_LIST[x].name);
len = strlen(end);
end += len;
size -= len;
}
}
if (start == end)
ast_copy_string(start, "nothing)", size);
else if (size > 1)
*(end -1) = ')';
return buf;
}
static struct ast_codec_alias_table {
char *alias;
char *realname;
} ast_codec_alias_table[] = {
{ "slinear", "slin"},
{ "slinear16", "slin16"},
{ "g723.1", "g723"},
};
static const char *ast_expand_codec_alias(const char *in)
{
int x;
for (x = 0; x < sizeof(ast_codec_alias_table) / sizeof(ast_codec_alias_table[0]); x++) {
if (!strcmp(in,ast_codec_alias_table[x].alias))
return ast_codec_alias_table[x].realname;
}
return in;
}
int ast_getformatbyname(const char *name)
{
int x, all, format = 0;
all = strcasecmp(name, "all") ? 0 : 1;
for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
if (all ||
!strcasecmp(AST_FORMAT_LIST[x].name,name) ||
!strcasecmp(AST_FORMAT_LIST[x].name, ast_expand_codec_alias(name))) {
format |= AST_FORMAT_LIST[x].bits;
if (!all)
break;
}
}
return format;
}
char *ast_codec2str(int codec)
{
int x;
char *ret = "unknown";
for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
if (AST_FORMAT_LIST[x].bits == codec) {
ret = AST_FORMAT_LIST[x].desc;
break;
}
}
return ret;
}
static char *show_codecs(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
int i, found=0;
char hex[25];
switch (cmd) {
case CLI_INIT:
e->command = "core show codecs [audio|video|image]";
e->usage =
"Usage: core show codecs [audio|video|image]\n"
" Displays codec mapping\n";
return NULL;
case CLI_GENERATE:
return NULL;
}
if ((a->argc < 3) || (a->argc > 4))
return CLI_SHOWUSAGE;
if (!ast_opt_dont_warn)
ast_cli(a->fd, "Disclaimer: this command is for informational purposes only.\n"
"\tIt does not indicate anything about your configuration.\n");
ast_cli(a->fd, "%11s %9s %10s TYPE %8s %s\n","INT","BINARY","HEX","NAME","DESC");
ast_cli(a->fd, "--------------------------------------------------------------------------------\n");
if ((a->argc == 3) || (!strcasecmp(a->argv[3],"audio"))) {
found = 1;
for (i=0;i<13;i++) {
snprintf(hex,25,"(0x%x)",1<<i);
ast_cli(a->fd, "%11u (1 << %2d) %10s audio %8s (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
}
}
if ((a->argc == 3) || (!strcasecmp(a->argv[3],"image"))) {
found = 1;
for (i=16;i<18;i++) {
snprintf(hex,25,"(0x%x)",1<<i);
ast_cli(a->fd, "%11u (1 << %2d) %10s image %8s (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
}
}
if ((a->argc == 3) || (!strcasecmp(a->argv[3],"video"))) {
found = 1;
for (i=18;i<22;i++) {
snprintf(hex,25,"(0x%x)",1<<i);
ast_cli(a->fd, "%11u (1 << %2d) %10s video %8s (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
}
}
if (!found)
return CLI_SHOWUSAGE;
else
return CLI_SUCCESS;
}
static char *show_codec_n(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
int codec, i, found=0;
switch (cmd) {
case CLI_INIT:
e->command = "core show codec";
e->usage =
"Usage: core show codec <number>\n"
" Displays codec mapping\n";
return NULL;
case CLI_GENERATE:
return NULL;
}
if (a->argc != 4)
return CLI_SHOWUSAGE;
if (sscanf(a->argv[3],"%d",&codec) != 1)
return CLI_SHOWUSAGE;
for (i = 0; i < 32; i++)
if (codec & (1 << i)) {
found = 1;
ast_cli(a->fd, "%11u (1 << %2d) %s\n",1 << i,i,ast_codec2str(1<<i));
}
if (!found)
ast_cli(a->fd, "Codec %d not found\n", codec);
return CLI_SUCCESS;
}
/*! Dump a frame for debugging purposes */
void ast_frame_dump(const char *name, struct ast_frame *f, char *prefix)
{
const char noname[] = "unknown";
char ftype[40] = "Unknown Frametype";
char cft[80];
char subclass[40] = "Unknown Subclass";
char csub[80];
char moreinfo[40] = "";
char cn[60];
char cp[40];
char cmn[40];
const char *message = "Unknown";
if (!name)
name = noname;
if (!f) {
ast_verbose("%s [ %s (NULL) ] [%s]\n",
term_color(cp, prefix, COLOR_BRMAGENTA, COLOR_BLACK, sizeof(cp)),
term_color(cft, "HANGUP", COLOR_BRRED, COLOR_BLACK, sizeof(cft)),
term_color(cn, name, COLOR_YELLOW, COLOR_BLACK, sizeof(cn)));
return;
}
/* XXX We should probably print one each of voice and video when the format changes XXX */
if (f->frametype == AST_FRAME_VOICE)
return;
if (f->frametype == AST_FRAME_VIDEO)
return;
switch(f->frametype) {
case AST_FRAME_DTMF_BEGIN:
strcpy(ftype, "DTMF Begin");
subclass[0] = f->subclass;
subclass[1] = '\0';
break;
case AST_FRAME_DTMF_END:
strcpy(ftype, "DTMF End");
subclass[0] = f->subclass;
subclass[1] = '\0';
break;
case AST_FRAME_CONTROL:
strcpy(ftype, "Control");
switch(f->subclass) {
case AST_CONTROL_HANGUP:
strcpy(subclass, "Hangup");
break;
case AST_CONTROL_RING:
strcpy(subclass, "Ring");
break;
case AST_CONTROL_RINGING:
strcpy(subclass, "Ringing");
break;
case AST_CONTROL_ANSWER:
strcpy(subclass, "Answer");
break;
case AST_CONTROL_BUSY:
strcpy(subclass, "Busy");
break;
case AST_CONTROL_TAKEOFFHOOK:
strcpy(subclass, "Take Off Hook");
break;
case AST_CONTROL_OFFHOOK:
strcpy(subclass, "Line Off Hook");
break;
case AST_CONTROL_CONGESTION:
strcpy(subclass, "Congestion");
break;
case AST_CONTROL_FLASH:
strcpy(subclass, "Flash");
break;
case AST_CONTROL_WINK:
strcpy(subclass, "Wink");
break;
case AST_CONTROL_OPTION:
strcpy(subclass, "Option");
break;
case AST_CONTROL_RADIO_KEY:
strcpy(subclass, "Key Radio");
break;
case AST_CONTROL_RADIO_UNKEY:
strcpy(subclass, "Unkey Radio");
break;
case AST_CONTROL_HOLD:
strcpy(subclass, "Hold");
break;
case AST_CONTROL_UNHOLD:
strcpy(subclass, "Unhold");
break;
case AST_CONTROL_T38:
if (f->datalen != sizeof(enum ast_control_t38)) {
message = "Invalid";
} else {
enum ast_control_t38 state = *((enum ast_control_t38 *) f->data);
if (state == AST_T38_REQUEST_NEGOTIATE)
message = "Negotiation Requested";
else if (state == AST_T38_REQUEST_TERMINATE)
message = "Negotiation Request Terminated";
else if (state == AST_T38_NEGOTIATED)
message = "Negotiated";
else if (state == AST_T38_TERMINATED)
message = "Terminated";
else if (state == AST_T38_REFUSED)
message = "Refused";
}
snprintf(subclass, sizeof(subclass), "T38/%s", message);
break;
case -1:
strcpy(subclass, "Stop generators");
break;
default:
snprintf(subclass, sizeof(subclass), "Unknown control '%d'", f->subclass);
}
break;
case AST_FRAME_NULL:
strcpy(ftype, "Null Frame");
strcpy(subclass, "N/A");
break;
case AST_FRAME_IAX:
/* Should never happen */
strcpy(ftype, "IAX Specific");
snprintf(subclass, sizeof(subclass), "IAX Frametype %d", f->subclass);
break;
case AST_FRAME_TEXT:
strcpy(ftype, "Text");
strcpy(subclass, "N/A");
ast_copy_string(moreinfo, f->data, sizeof(moreinfo));
break;
case AST_FRAME_IMAGE:
strcpy(ftype, "Image");
snprintf(subclass, sizeof(subclass), "Image format %s\n", ast_getformatname(f->subclass));
break;
case AST_FRAME_HTML:
strcpy(ftype, "HTML");
switch(f->subclass) {
case AST_HTML_URL:
strcpy(subclass, "URL");
ast_copy_string(moreinfo, f->data, sizeof(moreinfo));
break;
case AST_HTML_DATA:
strcpy(subclass, "Data");
break;
case AST_HTML_BEGIN:
strcpy(subclass, "Begin");
break;
case AST_HTML_END:
strcpy(subclass, "End");
break;
case AST_HTML_LDCOMPLETE:
strcpy(subclass, "Load Complete");
break;
case AST_HTML_NOSUPPORT:
strcpy(subclass, "No Support");
break;
case AST_HTML_LINKURL:
strcpy(subclass, "Link URL");
ast_copy_string(moreinfo, f->data, sizeof(moreinfo));
break;
case AST_HTML_UNLINK:
strcpy(subclass, "Unlink");
break;
case AST_HTML_LINKREJECT:
strcpy(subclass, "Link Reject");
break;
default:
snprintf(subclass, sizeof(subclass), "Unknown HTML frame '%d'\n", f->subclass);
break;
}
break;
case AST_FRAME_MODEM:
strcpy(ftype, "Modem");
switch (f->subclass) {
case AST_MODEM_T38:
strcpy(subclass, "T.38");
break;
case AST_MODEM_V150:
strcpy(subclass, "V.150");
break;
default:
snprintf(subclass, sizeof(subclass), "Unknown MODEM frame '%d'\n", f->subclass);
break;
}
break;
default:
snprintf(ftype, sizeof(ftype), "Unknown Frametype '%d'", f->frametype);
}
if (!ast_strlen_zero(moreinfo))
ast_verbose("%s [ TYPE: %s (%d) SUBCLASS: %s (%d) '%s' ] [%s]\n",
term_color(cp, prefix, COLOR_BRMAGENTA, COLOR_BLACK, sizeof(cp)),
term_color(cft, ftype, COLOR_BRRED, COLOR_BLACK, sizeof(cft)),
f->frametype,
term_color(csub, subclass, COLOR_BRCYAN, COLOR_BLACK, sizeof(csub)),
f->subclass,
term_color(cmn, moreinfo, COLOR_BRGREEN, COLOR_BLACK, sizeof(cmn)),
term_color(cn, name, COLOR_YELLOW, COLOR_BLACK, sizeof(cn)));
else
ast_verbose("%s [ TYPE: %s (%d) SUBCLASS: %s (%d) ] [%s]\n",
term_color(cp, prefix, COLOR_BRMAGENTA, COLOR_BLACK, sizeof(cp)),
term_color(cft, ftype, COLOR_BRRED, COLOR_BLACK, sizeof(cft)),
f->frametype,
term_color(csub, subclass, COLOR_BRCYAN, COLOR_BLACK, sizeof(csub)),
f->subclass,
term_color(cn, name, COLOR_YELLOW, COLOR_BLACK, sizeof(cn)));
}
#ifdef TRACE_FRAMES
static char *show_frame_stats(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
struct ast_frame *f;
int x=1;
switch (cmd) {
case CLI_INIT:
e->command = "core show frame stats";
e->usage =
"Usage: core show frame stats\n"
" Displays debugging statistics from framer\n";
return NULL;
case CLI_GENERATE:
return NULL;
}
if (a->argc != 4)
return CLI_SHOWUSAGE;
AST_LIST_LOCK(&headerlist);
ast_cli(a->fd, " Framer Statistics \n");
ast_cli(a->fd, "---------------------------\n");
ast_cli(a->fd, "Total allocated headers: %d\n", headers);
ast_cli(a->fd, "Queue Dump:\n");
AST_LIST_TRAVERSE(&headerlist, f, frame_list)
ast_cli(a->fd, "%d. Type %d, subclass %d from %s\n", x++, f->frametype, f->subclass, f->src ? f->src : "<Unknown>");
AST_LIST_UNLOCK(&headerlist);
return CLI_SUCCESS;
}
#endif
/* Builtin Asterisk CLI-commands for debugging */
static struct ast_cli_entry my_clis[] = {
AST_CLI_DEFINE(show_codecs, "Displays a list of codecs"),
AST_CLI_DEFINE(show_codec_n, "Shows a specific codec"),
#ifdef TRACE_FRAMES
AST_CLI_DEFINE(show_frame_stats, "Shows frame statistics"),
#endif
};
int init_framer(void)
{
ast_cli_register_multiple(my_clis, sizeof(my_clis) / sizeof(struct ast_cli_entry));
return 0;
}
void ast_codec_pref_convert(struct ast_codec_pref *pref, char *buf, size_t size, int right)
{
int x, differential = (int) 'A', mem;
char *from, *to;
if (right) {
from = pref->order;
to = buf;
mem = size;
} else {
to = pref->order;
from = buf;
mem = 32;
}
memset(to, 0, mem);
for (x = 0; x < 32 ; x++) {
if (!from[x])
break;
to[x] = right ? (from[x] + differential) : (from[x] - differential);
}
}
int ast_codec_pref_string(struct ast_codec_pref *pref, char *buf, size_t size)
{
int x, codec;
size_t total_len, slen;
char *formatname;
memset(buf,0,size);
total_len = size;
buf[0] = '(';
total_len--;
for(x = 0; x < 32 ; x++) {
if (total_len <= 0)
break;
if (!(codec = ast_codec_pref_index(pref,x)))
break;
if ((formatname = ast_getformatname(codec))) {
slen = strlen(formatname);
if (slen > total_len)
break;
strncat(buf, formatname, total_len - 1); /* safe */
total_len -= slen;
}
if (total_len && x < 31 && ast_codec_pref_index(pref , x + 1)) {
strncat(buf, "|", total_len - 1); /* safe */
total_len--;
}
}
if (total_len) {
strncat(buf, ")", total_len - 1); /* safe */
total_len--;
}
return size - total_len;
}
int ast_codec_pref_index(struct ast_codec_pref *pref, int index)
{
int slot = 0;
if ((index >= 0) && (index < sizeof(pref->order))) {
slot = pref->order[index];
}
return slot ? AST_FORMAT_LIST[slot-1].bits : 0;
}
/*! \brief Remove codec from pref list */
void ast_codec_pref_remove(struct ast_codec_pref *pref, int format)
{
struct ast_codec_pref oldorder;
int x, y = 0;
int slot;
int size;
if (!pref->order[0])
return;
memcpy(&oldorder, pref, sizeof(oldorder));
memset(pref, 0, sizeof(*pref));
for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
slot = oldorder.order[x];
size = oldorder.framing[x];
if (! slot)
break;
if (AST_FORMAT_LIST[slot-1].bits != format) {
pref->order[y] = slot;
pref->framing[y++] = size;
}
}
}
/*! \brief Append codec to list */
int ast_codec_pref_append(struct ast_codec_pref *pref, int format)
{
int x, newindex = 0;
ast_codec_pref_remove(pref, format);
for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
if (AST_FORMAT_LIST[x].bits == format) {
newindex = x + 1;
break;
}
}
if (newindex) {
for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
if (!pref->order[x]) {
pref->order[x] = newindex;
break;
}
}
}
return x;
}
/*! \brief Prepend codec to list */
void ast_codec_pref_prepend(struct ast_codec_pref *pref, int format, int only_if_existing)
{
int x, newindex = 0;
/* First step is to get the codecs "index number" */
for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
if (AST_FORMAT_LIST[x].bits == format) {
newindex = x + 1;
break;
}
}
/* Done if its unknown */
if (!newindex)
return;
/* Now find any existing occurrence, or the end */
for (x = 0; x < 32; x++) {
if (!pref->order[x] || pref->order[x] == newindex)
break;
}
if (only_if_existing && !pref->order[x])
return;
/* Move down to make space to insert - either all the way to the end,
or as far as the existing location (which will be overwritten) */
for (; x > 0; x--) {
pref->order[x] = pref->order[x - 1];
pref->framing[x] = pref->framing[x - 1];
}
/* And insert the new entry */
pref->order[0] = newindex;
pref->framing[0] = 0; /* ? */
}
/*! \brief Set packet size for codec */
int ast_codec_pref_setsize(struct ast_codec_pref *pref, int format, int framems)
{
int x, index = -1;
for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
if (AST_FORMAT_LIST[x].bits == format) {
index = x;
break;
}
}
if (index < 0)
return -1;
/* size validation */
if (!framems)
framems = AST_FORMAT_LIST[index].def_ms;
if (AST_FORMAT_LIST[index].inc_ms && framems % AST_FORMAT_LIST[index].inc_ms) /* avoid division by zero */
framems -= framems % AST_FORMAT_LIST[index].inc_ms;
if (framems < AST_FORMAT_LIST[index].min_ms)
framems = AST_FORMAT_LIST[index].min_ms;
if (framems > AST_FORMAT_LIST[index].max_ms)
framems = AST_FORMAT_LIST[index].max_ms;
for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
if (pref->order[x] == (index + 1)) {
pref->framing[x] = framems;
break;
}
}
return x;
}
/*! \brief Get packet size for codec */
struct ast_format_list ast_codec_pref_getsize(struct ast_codec_pref *pref, int format)
{
int x, index = -1, framems = 0;
struct ast_format_list fmt = { 0, };
for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
if (AST_FORMAT_LIST[x].bits == format) {
fmt = AST_FORMAT_LIST[x];
index = x;
break;
}
}
for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
if (pref->order[x] == (index + 1)) {
framems = pref->framing[x];
break;
}
}
/* size validation */
if (!framems)
framems = AST_FORMAT_LIST[index].def_ms;
if (AST_FORMAT_LIST[index].inc_ms && framems % AST_FORMAT_LIST[index].inc_ms) /* avoid division by zero */
framems -= framems % AST_FORMAT_LIST[index].inc_ms;
if (framems < AST_FORMAT_LIST[index].min_ms)
framems = AST_FORMAT_LIST[index].min_ms;
if (framems > AST_FORMAT_LIST[index].max_ms)
framems = AST_FORMAT_LIST[index].max_ms;
fmt.cur_ms = framems;
return fmt;
}
/*! \brief Pick a codec */
int ast_codec_choose(struct ast_codec_pref *pref, int formats, int find_best)
{
int x, ret = 0, slot;
for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
slot = pref->order[x];
if (!slot)
break;
if (formats & AST_FORMAT_LIST[slot-1].bits) {
ret = AST_FORMAT_LIST[slot-1].bits;
break;
}
}
if (ret & AST_FORMAT_AUDIO_MASK)
return ret;
ast_debug(4, "Could not find preferred codec - %s\n", find_best ? "Going for the best codec" : "Returning zero codec");
return find_best ? ast_best_codec(formats) : 0;
}
int ast_parse_allow_disallow(struct ast_codec_pref *pref, int *mask, const char *list, int allowing)
{
int errors = 0;
char *parse = NULL, *this = NULL, *psize = NULL;
int format = 0, framems = 0;
parse = ast_strdupa(list);
while ((this = strsep(&parse, ","))) {
framems = 0;
if ((psize = strrchr(this, ':'))) {
*psize++ = '\0';
ast_debug(1, "Packetization for codec: %s is %s\n", this, psize);
framems = atoi(psize);
if (framems < 0) {
framems = 0;
errors++;
ast_log(LOG_WARNING, "Bad packetization value for codec %s\n", this);
}
}
if (!(format = ast_getformatbyname(this))) {
ast_log(LOG_WARNING, "Cannot %s unknown format '%s'\n", allowing ? "allow" : "disallow", this);
errors++;
continue;
}
if (mask) {
if (allowing)
*mask |= format;
else
*mask &= ~format;
}
/* Set up a preference list for audio. Do not include video in preferences
since we can not transcode video and have to use whatever is offered
*/
if (pref && (format & AST_FORMAT_AUDIO_MASK)) {
if (strcasecmp(this, "all")) {
if (allowing) {
ast_codec_pref_append(pref, format);
ast_codec_pref_setsize(pref, format, framems);
}
else
ast_codec_pref_remove(pref, format);
} else if (!allowing) {
memset(pref, 0, sizeof(*pref));
}
}
}
return errors;
}
static int g723_len(unsigned char buf)
{
enum frame_type type = buf & TYPE_MASK;
switch(type) {
case TYPE_DONTSEND:
return 0;
break;
case TYPE_SILENCE:
return 4;
break;
case TYPE_HIGH:
return 24;
break;
case TYPE_LOW:
return 20;
break;
default:
ast_log(LOG_WARNING, "Badly encoded frame (%d)\n", type);
}
return -1;
}
static int g723_samples(unsigned char *buf, int maxlen)
{
int pos = 0;
int samples = 0;
int res;
while(pos < maxlen) {
res = g723_len(buf[pos]);
if (res <= 0)
break;
samples += 240;
pos += res;
}
return samples;
}
static unsigned char get_n_bits_at(unsigned char *data, int n, int bit)
{
int byte = bit / 8; /* byte containing first bit */
int rem = 8 - (bit % 8); /* remaining bits in first byte */
unsigned char ret = 0;
if (n <= 0 || n > 8)
return 0;
if (rem < n) {
ret = (data[byte] << (n - rem));
ret |= (data[byte + 1] >> (8 - n + rem));
} else {
ret = (data[byte] >> (rem - n));
}
return (ret & (0xff >> (8 - n)));
}
static int speex_get_wb_sz_at(unsigned char *data, int len, int bit)
{
static int SpeexWBSubModeSz[] = {
0, 36, 112, 192,
352, 0, 0, 0 };
int off = bit;
unsigned char c;
/* skip up to two wideband frames */
if (((len * 8 - off) >= 5) &&
get_n_bits_at(data, 1, off)) {
c = get_n_bits_at(data, 3, off + 1);
off += SpeexWBSubModeSz[c];
if (((len * 8 - off) >= 5) &&
get_n_bits_at(data, 1, off)) {
c = get_n_bits_at(data, 3, off + 1);
off += SpeexWBSubModeSz[c];
if (((len * 8 - off) >= 5) &&
get_n_bits_at(data, 1, off)) {
ast_log(LOG_WARNING, "Encountered corrupt speex frame; too many wideband frames in a row.\n");
return -1;
}
}
}
return off - bit;
}
static int speex_samples(unsigned char *data, int len)
{
static int SpeexSubModeSz[] = {
5, 43, 119, 160,
220, 300, 364, 492,
79, 0, 0, 0,
0, 0, 0, 0 };
static int SpeexInBandSz[] = {
1, 1, 4, 4,
4, 4, 4, 4,
8, 8, 16, 16,
32, 32, 64, 64 };
int bit = 0;
int cnt = 0;
int off;
unsigned char c;
while ((len * 8 - bit) >= 5) {
/* skip wideband frames */
off = speex_get_wb_sz_at(data, len, bit);
if (off < 0) {
ast_log(LOG_WARNING, "Had error while reading wideband frames for speex samples\n");
break;
}
bit += off;
if ((len * 8 - bit) < 5) {
ast_log(LOG_WARNING, "Not enough bits remaining after wide band for speex samples.\n");
break;
}
/* get control bits */
c = get_n_bits_at(data, 5, bit);
bit += 5;
if (c == 15) {
/* terminator */
break;
} else if (c == 14) {
/* in-band signal; next 4 bits contain signal id */
c = get_n_bits_at(data, 4, bit);
bit += 4;
bit += SpeexInBandSz[c];
} else if (c == 13) {
/* user in-band; next 5 bits contain msg len */
c = get_n_bits_at(data, 5, bit);
bit += 5;
bit += c * 8;
} else if (c > 8) {
/* unknown */
break;
} else {
/* skip number bits for submode (less the 5 control bits) */
bit += SpeexSubModeSz[c] - 5;
cnt += 160; /* new frame */
}
}
return cnt;
}
int ast_codec_get_samples(struct ast_frame *f)
{
int samples=0;
switch(f->subclass) {
case AST_FORMAT_SPEEX:
samples = speex_samples(f->data, f->datalen);
break;
case AST_FORMAT_G723_1:
samples = g723_samples(f->data, f->datalen);
break;
case AST_FORMAT_ILBC:
samples = 240 * (f->datalen / 50);
break;
case AST_FORMAT_GSM:
samples = 160 * (f->datalen / 33);
break;
case AST_FORMAT_G729A:
samples = f->datalen * 8;
break;
case AST_FORMAT_SLINEAR:
case AST_FORMAT_SLINEAR16:
samples = f->datalen / 2;
break;
case AST_FORMAT_LPC10:
/* assumes that the RTP packet contains one LPC10 frame */
samples = 22 * 8;
samples += (((char *)(f->data))[7] & 0x1) * 8;
break;
case AST_FORMAT_ULAW:
case AST_FORMAT_ALAW:
samples = f->datalen;
break;
case AST_FORMAT_G722:
case AST_FORMAT_ADPCM:
case AST_FORMAT_G726:
case AST_FORMAT_G726_AAL2:
samples = f->datalen * 2;
break;
default:
ast_log(LOG_WARNING, "Unable to calculate samples for format %s\n", ast_getformatname(f->subclass));
}
return samples;
}
int ast_codec_get_len(int format, int samples)
{
int len = 0;
/* XXX Still need speex, g723, and lpc10 XXX */
switch(format) {
case AST_FORMAT_G723_1:
len = (samples / 240) * 20;
break;
case AST_FORMAT_ILBC:
len = (samples / 240) * 50;
break;
case AST_FORMAT_GSM:
len = (samples / 160) * 33;
break;
case AST_FORMAT_G729A:
len = samples / 8;
break;
case AST_FORMAT_SLINEAR:
case AST_FORMAT_SLINEAR16:
len = samples * 2;
break;
case AST_FORMAT_ULAW:
case AST_FORMAT_ALAW:
len = samples;
break;
case AST_FORMAT_G722:
case AST_FORMAT_ADPCM:
case AST_FORMAT_G726:
case AST_FORMAT_G726_AAL2:
len = samples / 2;
break;
default:
ast_log(LOG_WARNING, "Unable to calculate sample length for format %s\n", ast_getformatname(format));
}
return len;
}
int ast_frame_adjust_volume(struct ast_frame *f, int adjustment)
{
int count;
short *fdata = f->data;
short adjust_value = abs(adjustment);
if ((f->frametype != AST_FRAME_VOICE) || (f->subclass != AST_FORMAT_SLINEAR))
return -1;
if (!adjustment)
return 0;
for (count = 0; count < f->samples; count++) {
if (adjustment > 0) {
ast_slinear_saturated_multiply(&fdata[count], &adjust_value);
} else if (adjustment < 0) {
ast_slinear_saturated_divide(&fdata[count], &adjust_value);
}
}
return 0;
}
int ast_frame_slinear_sum(struct ast_frame *f1, struct ast_frame *f2)
{
int count;
short *data1, *data2;
if ((f1->frametype != AST_FRAME_VOICE) || (f1->subclass != AST_FORMAT_SLINEAR))
return -1;
if ((f2->frametype != AST_FRAME_VOICE) || (f2->subclass != AST_FORMAT_SLINEAR))
return -1;
if (f1->samples != f2->samples)
return -1;
for (count = 0, data1 = f1->data, data2 = f2->data;
count < f1->samples;
count++, data1++, data2++)
ast_slinear_saturated_add(data1, data2);
return 0;
}
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