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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"
#include "asterisk/file.h"
#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;
struct ast_format format;
int flags;
float samplesperbyte;
unsigned int opt_needs_swap:1;
struct ast_frame f;
struct timeval delivery;
char data[SMOOTHER_SIZE];
char framedata[SMOOTHER_SIZE + AST_FRIENDLY_OFFSET];
struct ast_frame *opt;
int len;
};
struct ast_frame ast_null_frame = { AST_FRAME_NULL, };
static int smoother_frame_feed(struct ast_smoother *s, struct ast_frame *f, int swap)
{
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.ptr, f->samples);
} else {
memcpy(s->data + s->len, f->data.ptr, 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;
}
void ast_smoother_reset(struct ast_smoother *s, int bytes)
{
memset(s, 0, sizeof(*s));
s->size = bytes;
}
void ast_smoother_reconfigure(struct ast_smoother *s, int bytes)
{
/* if there is no change, then nothing to do */
if (s->size == bytes) {
return;
}
/* set the new desired output size */
s->size = bytes;
/* if there is no 'optimized' frame in the smoother,
* then there is nothing left to do
*/
if (!s->opt) {
return;
}
/* there is an 'optimized' frame here at the old size,
* but it must now be put into the buffer so the data
* can be extracted at the new size
*/
smoother_frame_feed(s, s->opt, s->opt_needs_swap);
s->opt = NULL;
}
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.id) {
ast_format_copy(&s->format, &f->subclass.format);
s->samplesperbyte = (float)f->samples / (float)f->datalen;
} else if (ast_format_cmp(&s->format, &f->subclass.format) == AST_FORMAT_CMP_NOT_EQUAL) {
ast_log(LOG_WARNING, "Smoother was working on %s format frames, now trying to feed %s?\n",
ast_getformatname(&s->format), ast_getformatname(&f->subclass.format));
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 &&
!s->len &&
(f->offset >= AST_MIN_OFFSET)) {
/* Optimize by sending the frame we just got
on the next read, thus eliminating the douple
copy */
if (swap)
ast_swapcopy_samples(f->data.ptr, f->data.ptr, f->samples);
s->opt = f;
s->opt_needs_swap = swap ? 1 : 0;
return 0;
}
return smoother_frame_feed(s, f, swap);
}
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->len % 10)))
return NULL;
}
len = s->size;
if (len > s->len)
len = s->len;
/* Make frame */
s->f.frametype = AST_FRAME_VOICE;
ast_format_copy(&s->f.subclass.format, &s->format);
s->f.data.ptr = 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.ptr, 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, ast_format_rate(&s->format)));
}
}
/* 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);
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
static void __frame_free(struct ast_frame *fr, int cache)
{
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.ptr)
ast_free(fr->data.ptr - fr->offset);
}
if (fr->mallocd & AST_MALLOCD_SRC) {
if (fr->src)
ast_free((void *) fr->src);
}
if (fr->mallocd & AST_MALLOCD_HDR) {
ast_free(fr);
}
}
void ast_frame_free(struct ast_frame *frame, int cache)
{
struct ast_frame *next;
for (next = AST_LIST_NEXT(frame, frame_list);
frame;
frame = next, next = frame ? AST_LIST_NEXT(frame, frame_list) : NULL) {
__frame_free(frame, cache);
}
}
/*!
* \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;
/* if none of the existing frame is malloc'd, let ast_frdup() do it
since it is more efficient
*/
if (fr->mallocd == 0) {
return ast_frdup(fr);
}
/* if everything is already malloc'd, we are done */
if ((fr->mallocd & (AST_MALLOCD_HDR | AST_MALLOCD_SRC | AST_MALLOCD_DATA)) ==
(AST_MALLOCD_HDR | AST_MALLOCD_SRC | AST_MALLOCD_DATA)) {
return fr;
}
if (!(fr->mallocd & AST_MALLOCD_HDR)) {
/* Allocate a new header if needed */
if (!(out = ast_frame_header_new())) {
return NULL;
}
out->frametype = fr->frametype;
ast_format_copy(&out->subclass.format, &fr->subclass.format);
out->datalen = fr->datalen;
out->samples = fr->samples;
out->offset = fr->offset;
/* Copy the timing data */
ast_copy_flags(out, fr, AST_FLAGS_ALL);
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) && fr->src) {
if (!(out->src = ast_strdup(fr->src))) {
if (out != fr) {
ast_free(out);
}
return NULL;
}
} else {
out->src = fr->src;
fr->src = NULL;
fr->mallocd &= ~AST_MALLOCD_SRC;
}
if (!(fr->mallocd & AST_MALLOCD_DATA)) {
if (!fr->datalen) {
out->data.uint32 = fr->data.uint32;
out->mallocd = AST_MALLOCD_HDR | AST_MALLOCD_SRC;
return out;
}
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.ptr, fr->datalen);
out->data.ptr = newdata;
} else {
out->data = fr->data;
memset(&fr->data, 0, sizeof(fr->data));
fr->mallocd &= ~AST_MALLOCD_DATA;
}
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;
ast_format_copy(&out->subclass.format, &f->subclass.format);
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.ptr = buf + sizeof(*out) + AST_FRIENDLY_OFFSET;
memcpy(out->data.ptr, f->data.ptr, out->datalen);
} else {
out->data.uint32 = f->data.uint32;
}
if (srclen > 0) {
/* This may seem a little strange, but it's to avoid a gcc (4.2.4) compiler warning */
char *src;
out->src = buf + sizeof(*out) + AST_FRIENDLY_OFFSET + f->datalen;
src = (char *) out->src;
/* Must have space since we allocated for it */
strcpy(src, f->src);
}
ast_copy_flags(out, f, AST_FLAGS_ALL);
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);
}
/*! 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.integer;
subclass[1] = '\0';
break;
case AST_FRAME_DTMF_END:
strcpy(ftype, "DTMF End");
subclass[0] = f->subclass.integer;
subclass[1] = '\0';
break;
case AST_FRAME_CONTROL:
strcpy(ftype, "Control");
switch (f->subclass.integer) {
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_PARAMETERS:
if (f->datalen != sizeof(struct ast_control_t38_parameters)) {
message = "Invalid";
} else {
struct ast_control_t38_parameters *parameters = f->data.ptr;
enum ast_control_t38 state = parameters->request_response;
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_Parameters/%s", message);
break;
case -1:
strcpy(subclass, "Stop generators");
break;
default:
snprintf(subclass, sizeof(subclass), "Unknown control '%d'", f->subclass.integer);
}
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.integer);
break;
case AST_FRAME_TEXT:
strcpy(ftype, "Text");
strcpy(subclass, "N/A");
ast_copy_string(moreinfo, f->data.ptr, sizeof(moreinfo));
break;
case AST_FRAME_IMAGE:
strcpy(ftype, "Image");
snprintf(subclass, sizeof(subclass), "Image format %s\n", ast_getformatname(&f->subclass.format));
break;
case AST_FRAME_HTML:
strcpy(ftype, "HTML");
switch (f->subclass.integer) {
case AST_HTML_URL:
strcpy(subclass, "URL");
ast_copy_string(moreinfo, f->data.ptr, 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.ptr, 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.integer);
break;
}
break;
case AST_FRAME_MODEM:
strcpy(ftype, "Modem");
switch (f->subclass.integer) {
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.integer);
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.integer,
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.integer,
term_color(cn, name, COLOR_YELLOW, COLOR_BLACK, sizeof(cn)));
}
int ast_parse_allow_disallow(struct ast_codec_pref *pref, struct ast_format_cap *cap, const char *list, int allowing)
{
int errors = 0, framems = 0, all = 0;
char *parse = NULL, *this = NULL, *psize = NULL;
struct ast_format format;
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);
}
}
all = strcasecmp(this, "all") ? 0 : 1;
if (!all && !ast_getformatbyname(this, &format)) {
ast_log(LOG_WARNING, "Cannot %s unknown format '%s'\n", allowing ? "allow" : "disallow", this);
errors++;
continue;
}
if (cap) {
if (allowing) {
if (all) {
ast_format_cap_add_all(cap);
} else {
ast_format_cap_add(cap, &format);
}
} else {
if (all) {
ast_format_cap_remove_all(cap);
} else {
ast_format_cap_remove(cap, &format);
}
}
}
if (pref) {
if (!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 const int SpeexWBSubModeSz[] = {
4, 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 const int SpeexSubModeSz[] = {
5, 43, 119, 160,
220, 300, 364, 492,
79, 0, 0, 0,
0, 0, 0, 0 };
static const 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)
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 4 bits contain msg len */
c = get_n_bits_at(data, 4, bit);
bit += 4;
/* after which it's 5-bit signal id + c bytes of data */
bit += 5 + c * 8;
} else if (c > 8) {
/* unknown */
ast_log(LOG_WARNING, "Unknown speex control frame %d\n", c);
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.format.id) {
case AST_FORMAT_SPEEX:
samples = speex_samples(f->data.ptr, f->datalen);
break;
case AST_FORMAT_SPEEX16:
samples = 2 * speex_samples(f->data.ptr, f->datalen);
break;
case AST_FORMAT_SPEEX32:
samples = 4 * speex_samples(f->data.ptr, f->datalen);
break;
case AST_FORMAT_G723_1:
samples = g723_samples(f->data.ptr, 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.ptr))[7] & 0x1) * 8;
break;
case AST_FORMAT_ULAW:
case AST_FORMAT_ALAW:
case AST_FORMAT_TESTLAW:
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;
case AST_FORMAT_SIREN7:
/* 16,000 samples per second at 32kbps is 4,000 bytes per second */
samples = f->datalen * (16000 / 4000);
break;
case AST_FORMAT_SIREN14:
/* 32,000 samples per second at 48kbps is 6,000 bytes per second */
samples = (int) f->datalen * ((float) 32000 / 6000);
break;
case AST_FORMAT_G719:
/* 48,000 samples per second at 64kbps is 8,000 bytes per second */
samples = (int) f->datalen * ((float) 48000 / 8000);
break;
case AST_FORMAT_SILK:
if (!(ast_format_isset(&f->subclass.format,
SILK_ATTR_KEY_SAMP_RATE,
SILK_ATTR_VAL_SAMP_24KHZ,
AST_FORMAT_ATTR_END))) {
return 480;
} else if (!(ast_format_isset(&f->subclass.format,
SILK_ATTR_KEY_SAMP_RATE,
SILK_ATTR_VAL_SAMP_16KHZ,
AST_FORMAT_ATTR_END))) {
return 320;
} else if (!(ast_format_isset(&f->subclass.format,
SILK_ATTR_KEY_SAMP_RATE,
SILK_ATTR_VAL_SAMP_12KHZ,
AST_FORMAT_ATTR_END))) {
return 240;
} else {
return 160;
}
case AST_FORMAT_CELT:
/* TODO The assumes 20ms delivery right now, which is incorrect */
samples = ast_format_rate(&f->subclass.format) / 50;
break;
default:
ast_log(LOG_WARNING, "Unable to calculate samples for format %s\n", ast_getformatname(&f->subclass.format));
}
return samples;
}
int ast_codec_get_len(struct ast_format *format, int samples)
{
int len = 0;
/* XXX Still need speex, and lpc10 XXX */
switch(format->id) {
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:
case AST_FORMAT_TESTLAW:
len = samples;
break;
case AST_FORMAT_G722:
case AST_FORMAT_ADPCM:
case AST_FORMAT_G726:
case AST_FORMAT_G726_AAL2:
len = samples / 2;
break;
case AST_FORMAT_SIREN7:
/* 16,000 samples per second at 32kbps is 4,000 bytes per second */
len = samples / (16000 / 4000);
break;
case AST_FORMAT_SIREN14:
/* 32,000 samples per second at 48kbps is 6,000 bytes per second */
len = (int) samples / ((float) 32000 / 6000);
break;
case AST_FORMAT_G719:
/* 48,000 samples per second at 64kbps is 8,000 bytes per second */
len = (int) samples / ((float) 48000 / 8000);
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.ptr;
short adjust_value = abs(adjustment);
if ((f->frametype != AST_FRAME_VOICE) || !(ast_format_is_slinear(&f->subclass.format))) {
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.format.id != AST_FORMAT_SLINEAR))
return -1;
if ((f2->frametype != AST_FRAME_VOICE) || (f2->subclass.format.id != AST_FORMAT_SLINEAR))
return -1;
if (f1->samples != f2->samples)
return -1;
for (count = 0, data1 = f1->data.ptr, data2 = f2->data.ptr;
count < f1->samples;
count++, data1++, data2++)
ast_slinear_saturated_add(data1, data2);
return 0;
}
int ast_frame_clear(struct ast_frame *frame)
{
struct ast_frame *next;
for (next = AST_LIST_NEXT(frame, frame_list);
frame;
frame = next, next = frame ? AST_LIST_NEXT(frame, frame_list) : NULL) {
memset(frame->data.ptr, 0, frame->datalen);
}
return 0;
}
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