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Adds pass-through support for codec CELT.

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This patch adds pass-through support for CELT.  CELT
formats are defined in codecs.conf and can be configured
to any sample rate a CELT endpoint supports.  This patch also
addresses a crash in channel.c resulting from a frame list being
freed incorrectly.  This crash was discovered while testing a CELT
translator which had to split encoded audio into multiple frames.
The codec translator is not a part of this patch, but may be
contributed in the future.

Review: https://reviewboard.asterisk.org/r/1294/


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@326855 65c4cc65-6c06-0410-ace0-fbb531ad65f3
10-digiumphones
David Vossel 14 years ago
parent b5609161e0
commit 513c680b8c
8 changed files with 120 additions and 30 deletions
Show Stats Download Patch File Download Diff File

54
channels/chan_sip.c
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@ -9468,6 +9468,7 @@ static int process_sdp_a_audio(const char *a, struct sip_pvt *p, struct ast_rtp_
if ((format = ast_rtp_codecs_get_payload_format(newaudiortp, codec))) {
unsigned int bit_rate;
int val = 0;
switch ((int) format->id) {
case AST_FORMAT_SIREN7:
@ -9500,20 +9501,21 @@ static int process_sdp_a_audio(const char *a, struct sip_pvt *p, struct ast_rtp_
}
}
break;
case AST_FORMAT_CELT:
if (sscanf(fmtp_string, "framesize=%30u", &val) == 1) {
ast_format_append(format, CELT_ATTR_KEY_FRAME_SIZE, val, AST_FORMAT_ATTR_END);
}
case AST_FORMAT_SILK:
{
int val = 0;
if (sscanf(fmtp_string, "maxaveragebitrate=%30u", &val) == 1) {
ast_format_append(format, SILK_ATTR_KEY_MAX_BITRATE, val, AST_FORMAT_ATTR_END);
}
if (sscanf(fmtp_string, "usedtx=%30u", &val) == 1) {
ast_format_append(format, SILK_ATTR_KEY_DTX, val ? 1 : 0, AST_FORMAT_ATTR_END);
}
if (sscanf(fmtp_string, "useinbandfec=%30u", &val) == 1) {
ast_format_append(format, SILK_ATTR_KEY_FEC, val ? 1 : 0, AST_FORMAT_ATTR_END);
}
break;
if (sscanf(fmtp_string, "maxaveragebitrate=%30u", &val) == 1) {
ast_format_append(format, SILK_ATTR_KEY_MAX_BITRATE, val, AST_FORMAT_ATTR_END);
}
if (sscanf(fmtp_string, "usedtx=%30u", &val) == 1) {
ast_format_append(format, SILK_ATTR_KEY_DTX, val ? 1 : 0, AST_FORMAT_ATTR_END);
}
if (sscanf(fmtp_string, "useinbandfec=%30u", &val) == 1) {
ast_format_append(format, SILK_ATTR_KEY_FEC, val ? 1 : 0, AST_FORMAT_ATTR_END);
}
break;
}
}
}
@ -10829,7 +10831,7 @@ static void add_codec_to_sdp(const struct sip_pvt *p,
{
int rtp_code;
struct ast_format_list fmt;
int val = 0;
if (debug)
ast_verbose("Adding codec %d (%s) to SDP\n", format->id, ast_getformatname(format));
@ -10872,20 +10874,22 @@ static void add_codec_to_sdp(const struct sip_pvt *p,
/* Indicate that we only expect 64Kbps */
ast_str_append(a_buf, 0, "a=fmtp:%d bitrate=64000\r\n", rtp_code);
break;
case AST_FORMAT_CELT:
if (!ast_format_get_value(format, CELT_ATTR_KEY_FRAME_SIZE, &val) && val > 0) {
ast_str_append(a_buf, 0, "a=fmtp:%d framesize=%u\r\n", rtp_code, val);
}
break;
case AST_FORMAT_SILK:
{
int val = 0;
if (!ast_format_get_value(format, SILK_ATTR_KEY_MAX_BITRATE, &val) && val > 5000 && val < 40000) {
ast_str_append(a_buf, 0, "a=fmtp:%d maxaveragebitrate=%u\r\n", rtp_code, val);
}
if (!ast_format_get_value(format, SILK_ATTR_KEY_DTX, &val)) {
ast_str_append(a_buf, 0, "a=fmtp:%d usedtx=%u\r\n", rtp_code, val ? 1 : 0);
}
if (!ast_format_get_value(format, SILK_ATTR_KEY_FEC, &val)) {
ast_str_append(a_buf, 0, "a=fmtp:%d useinbandfec=%u\r\n", rtp_code, val ? 1 : 0);
}
break;
if (!ast_format_get_value(format, SILK_ATTR_KEY_MAX_BITRATE, &val) && val > 5000 && val < 40000) {
ast_str_append(a_buf, 0, "a=fmtp:%d maxaveragebitrate=%u\r\n", rtp_code, val);
}
if (!ast_format_get_value(format, SILK_ATTR_KEY_DTX, &val)) {
ast_str_append(a_buf, 0, "a=fmtp:%d usedtx=%u\r\n", rtp_code, val ? 1 : 0);
}
if (!ast_format_get_value(format, SILK_ATTR_KEY_FEC, &val)) {
ast_str_append(a_buf, 0, "a=fmtp:%d useinbandfec=%u\r\n", rtp_code, val ? 1 : 0);
}
break;
}
if (fmt.cur_ms && (fmt.cur_ms < *min_packet_size))

19
configs/codecs.conf.sample
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@ -126,7 +126,6 @@ maxbitrate=20000
fec=true
packetloss_percentage=10;
[silk24]
type=silk
samprate=24000
@ -134,3 +133,21 @@ maxbitrate=30000
fec=true
packetloss_percentage=10;
; Default custom CELT codec definitions. Only one custom CELT definition is allowed
; per a sample rate.
;[celt44]
;type=celt
;samprate=44100 ; The samplerate in hz. This option is required.
;framesize=480 ; The framesize option represents the duration of each frame in samples.
; This must be a factor of 2. This option is only advertised in an SDP
; when it is set. Otherwise a default of framesize of 480 is assumed
; internally
;[celt48]
;type=celt
;samprate=48000
;[celt32]
;type=celt
;samprate=32000

2
include/asterisk/format.h
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@ -28,6 +28,7 @@
#include "asterisk/astobj2.h"
#include "asterisk/silk.h"
#include "asterisk/celt.h"
#define AST_FORMAT_ATTR_SIZE 128
#define AST_FORMAT_INC 100000
@ -99,6 +100,7 @@ enum ast_format_id {
/*! Raw 16-bit Signed Linear (192000 Hz) PCM. maybe we're taking this too far. */
AST_FORMAT_SLINEAR192 = 27 + AST_FORMAT_TYPE_AUDIO,
AST_FORMAT_SPEEX32 = 28 + AST_FORMAT_TYPE_AUDIO,
AST_FORMAT_CELT = 29 + AST_FORMAT_TYPE_AUDIO,
/*! H.261 Video */
AST_FORMAT_H261 = 1 + AST_FORMAT_TYPE_VIDEO,

12
main/channel.c
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@ -1081,6 +1081,8 @@ struct ast_format *ast_best_codec(struct ast_format_cap *cap, struct ast_format
AST_FORMAT_SPEEX,
/*! SILK is pretty awesome. */
AST_FORMAT_SILK,
/*! CELT supports crazy high sample rates */
AST_FORMAT_CELT,
/*! Ick, LPC10 sounds terrible, but at least we have code for it, if you're tacky enough
to use it */
AST_FORMAT_LPC10,
@ -5019,12 +5021,13 @@ int ast_write(struct ast_channel *chan, struct ast_frame *fr)
from the single frame we passed in; if so, feed each one of them to the
channel, freeing each one after it has been written */
if ((f != fr) && AST_LIST_NEXT(f, frame_list)) {
struct ast_frame *cur, *next;
struct ast_frame *cur, *next = NULL;
unsigned int skip = 0;
for (cur = f, next = AST_LIST_NEXT(cur, frame_list);
cur;
cur = next, next = cur ? AST_LIST_NEXT(cur, frame_list) : NULL) {
cur = f;
while (cur) {
next = AST_LIST_NEXT(cur, frame_list);
AST_LIST_NEXT(cur, frame_list) = NULL;
if (!skip) {
if ((res = chan->tech->write(chan, cur)) < 0) {
chan->_softhangup |= AST_SOFTHANGUP_DEV;
@ -5037,6 +5040,7 @@ int ast_write(struct ast_channel *chan, struct ast_frame *fr)
}
}
ast_frfree(cur);
cur = next;
}
/* reset f so the code below doesn't attempt to free it */

54
main/format.c
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@ -748,6 +748,15 @@ int ast_format_rate(const struct ast_format *format)
} else {
return 8000;
}
case AST_FORMAT_CELT:
{
int samplerate;
if (!(ast_format_get_value(format,
CELT_ATTR_KEY_SAMP_RATE,
&samplerate))) {
return samplerate;
}
}
default:
return 8000;
}
@ -1085,6 +1094,32 @@ init_cleanup:
return -1;
}
static int custom_celt_format(struct ast_format_list *entry, unsigned int maxbitrate, unsigned int framesize)
{
if (!entry->samplespersecond) {
ast_log(LOG_WARNING, "Custom CELT format definition '%s' requires sample rate to be defined.\n", entry->name);
}
ast_format_set(&entry->format, AST_FORMAT_CELT, 0);
if (!has_interface(&entry->format)) {
return -1;
}
snprintf(entry->desc, sizeof(entry->desc), "CELT Custom Format %dkhz", entry->samplespersecond/1000);
ast_format_append(&entry->format,
CELT_ATTR_KEY_SAMP_RATE, entry->samplespersecond,
CELT_ATTR_KEY_MAX_BITRATE, maxbitrate,
CELT_ATTR_KEY_FRAME_SIZE, framesize,
AST_FORMAT_ATTR_END);
entry->fr_len = 80;
entry->min_ms = 20;
entry->max_ms = 20;
entry->inc_ms = 20;
entry->def_ms = 20;
return 0;
}
static int custom_silk_format(struct ast_format_list *entry, unsigned int maxbitrate, int usedtx, int usefec, int packetloss_percentage)
{
if (!entry->samplespersecond) {
@ -1144,6 +1179,8 @@ static int conf_process_format_name(const char *name, enum ast_format_id *id)
{
if (!strcasecmp(name, "silk")) {
*id = AST_FORMAT_SILK;
} else if (!strcasecmp(name, "celt")) {
*id = AST_FORMAT_CELT;
} else {
*id = 0;
return -1;
@ -1163,8 +1200,14 @@ static int conf_process_sample_rate(const char *rate, unsigned int *result)
*result = 24000;
} else if (!strcasecmp(rate, "32000")) {
*result = 32000;
} else if (!strcasecmp(rate, "44100")) {
*result = 44100;
} else if (!strcasecmp(rate, "48000")) {
*result = 48000;
} else if (!strcasecmp(rate, "96000")) {
*result = 96000;
} else if (!strcasecmp(rate, "192000")) {
*result = 192000;
} else {
*result = 0;
return -1;
@ -1184,6 +1227,7 @@ static int load_format_config(void)
struct {
enum ast_format_id id;
unsigned int maxbitrate;
unsigned int framesize;
unsigned int packetloss_percentage;
int usefec;
int usedtx;
@ -1221,6 +1265,11 @@ static int load_format_config(void)
ast_log(LOG_WARNING, "maxbitrate '%s' at line %d of %s is not supported.\n",
var->value, var->lineno, FORMAT_CONFIG);
}
} else if (!strcasecmp(var->name, "framesize")) {
if (sscanf(var->value, "%30u", &settings.framesize) != 1) {
ast_log(LOG_WARNING, "framesize '%s' at line %d of %s is not supported.\n",
var->value, var->lineno, FORMAT_CONFIG);
}
} else if (!strcasecmp(var->name, "dtx")) {
settings.usedtx = ast_true(var->value) ? 1 : 0;
} else if (!strcasecmp(var->name, "fec")) {
@ -1239,6 +1288,11 @@ static int load_format_config(void)
add_it = 1;
}
break;
case AST_FORMAT_CELT:
if (!(custom_celt_format(&entry, settings.maxbitrate, settings.framesize))) {
add_it = 1;
}
break;
default:
ast_log(LOG_WARNING, "Can not create custom format %s\n", entry.name);
}

4
main/frame.c
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@ -1011,6 +1011,10 @@ int ast_codec_get_samples(struct ast_frame *f)
} 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));
}

4
main/rtp_engine.c
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@ -1931,6 +1931,10 @@ int ast_rtp_engine_load_format(const struct ast_format *format)
set_next_mime_type(format, 0, "audio", "SILK", ast_format_rate(format));
add_static_payload(-1, format, 0);
break;
case AST_FORMAT_CELT:
set_next_mime_type(format, 0, "audio", "CELT", ast_format_rate(format));
add_static_payload(-1, format, 0);
break;
default:
break;
}

1
res/res_rtp_asterisk.c
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@ -1254,6 +1254,7 @@ static int ast_rtp_write(struct ast_rtp_instance *instance, struct ast_frame *fr
case AST_FORMAT_SPEEX16:
case AST_FORMAT_SPEEX32:
case AST_FORMAT_SILK:
case AST_FORMAT_CELT:
case AST_FORMAT_G723_1:
case AST_FORMAT_SIREN7:
case AST_FORMAT_SIREN14:

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