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G726-32 changes:

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split support for G726-32 into RFC3551 and AAL2 packing orders, since both are in use
change "G726-32" to be RFC3551 packing order, in spite of devices that use AAL2 order with this MIME type
add ability to directly transcode between packing orders


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@37494 65c4cc65-6c06-0410-ace0-fbb531ad65f3
1.4
Kevin P. Fleming 19 years ago
parent f8df42ad97
commit ea1d0c4b33
6 changed files with 199 additions and 77 deletions
Show Stats Download Patch File Download Diff File

4
channel.c
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@ -546,8 +546,10 @@ int ast_best_codec(int fmts)
AST_FORMAT_ALAW,
/*! Okay, well, signed linear is easy to translate into other stuff */
AST_FORMAT_SLINEAR,
/*! G.726 is standard ADPCM */
/*! G.726 is standard ADPCM, in RFC3551 packing order */
AST_FORMAT_G726,
/*! G.726 is standard ADPCM, in AAL2 packing order */
AST_FORMAT_G726_AAL2,
/*! ADPCM has great sound quality and is still pretty easy to translate */
AST_FORMAT_ADPCM,
/*! Okay, we're down to vocoders now, so pick GSM because it's small and easier to

15
channels/chan_iax2.c
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@ -182,16 +182,17 @@ int (*iax2_regfunk)(char *username, int onoff) = NULL;
#define IAX_CAPABILITY_FULLBANDWIDTH 0xFFFF
/* T1, maybe ISDN */
#define IAX_CAPABILITY_MEDBANDWIDTH (IAX_CAPABILITY_FULLBANDWIDTH & \
~AST_FORMAT_SLINEAR & \
~AST_FORMAT_ULAW & \
~AST_FORMAT_ALAW)
~AST_FORMAT_SLINEAR & \
~AST_FORMAT_ULAW & \
~AST_FORMAT_ALAW)
/* A modem */
#define IAX_CAPABILITY_LOWBANDWIDTH (IAX_CAPABILITY_MEDBANDWIDTH & \
~AST_FORMAT_G726 & \
~AST_FORMAT_ADPCM)
#define IAX_CAPABILITY_LOWBANDWIDTH (IAX_CAPABILITY_MEDBANDWIDTH & \
~AST_FORMAT_G726 & \
~AST_FORMAT_G726_AAL2 & \
~AST_FORMAT_ADPCM)
#define IAX_CAPABILITY_LOWFREE (IAX_CAPABILITY_LOWBANDWIDTH & \
~AST_FORMAT_G723_1)
~AST_FORMAT_G723_1)
#define DEFAULT_MAXMS 2000 /* Must be faster than 2 seconds by default */

243
codecs/codec_g726.c
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@ -1,9 +1,10 @@
/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 1999 - 2005, Digium, Inc.
* Copyright (C) 1999 - 2006, Digium, Inc.
*
* Mark Spencer <markster@digium.com>
* Kevin P. Fleming <kpfleming@digium.com>
*
* Based on frompcm.c and topcm.c from the Emiliano MIPL browser/
* interpreter. See http://www.bsdtelephony.com.mx
@ -21,7 +22,7 @@
/*! \file
*
* \brief codec_g726.c - translate between signed linear and ITU G.726-32kbps
* \brief codec_g726.c - translate between signed linear and ITU G.726-32kbps (both RFC3551 and AAL2 codeword packing)
*
* \ingroup codecs
*/
@ -73,10 +74,10 @@ typedef long long sint64;
/*
* The following is the definition of the state structure
* used by the G.721/G.723 encoder and decoder to preserve their internal
* used by the G.726 encoder and decoder to preserve their internal
* state between successive calls. The meanings of the majority
* of the state structure fields are explained in detail in the
* CCITT Recommendation G.721. The field names are essentially indentical
* CCITT Recommendation G.721. The field names are essentially identical
* to variable names in the bit level description of the coding algorithm
* included in this Recommendation.
*/
@ -86,25 +87,21 @@ struct g726_state {
int dms; /* Short term energy estimate. */
int dml; /* Long term energy estimate. */
int ap; /* Linear weighting coefficient of 'yl' and 'yu'. */
int a[2]; /* Coefficients of pole portion of prediction filter.
* stored as fixed-point 1==2^14 */
* stored as fixed-point 1==2^14 */
int b[6]; /* Coefficients of zero portion of prediction filter.
* stored as fixed-point 1==2^14 */
* stored as fixed-point 1==2^14 */
int pk[2]; /* Signs of previous two samples of a partially
* reconstructed signal.
*/
int dq[6]; /* Previous 6 samples of the quantized difference signal
* stored as fixed point 1==2^12,
* or in internal floating point format */
* reconstructed signal. */
int dq[6]; /* Previous 6 samples of the quantized difference signal
* stored as fixed point 1==2^12,
* or in internal floating point format */
int sr[2]; /* Previous 2 samples of the quantized difference signal
* stored as fixed point 1==2^12,
* or in internal floating point format */
int td; /* delayed tone detect, new in 1988 version */
* stored as fixed point 1==2^12,
* or in internal floating point format */
int td; /* delayed tone detect, new in 1988 version */
};
static int qtab_721[7] = {-124, 80, 178, 246, 300, 349, 400};
/*
* Maps G.721 code word to reconstructed scale factor normalized log
@ -124,10 +121,6 @@ static int _witab[16] = {-12, 18, 41, 64, 112, 198, 355, 1122,
static int _fitab[16] = {0, 0, 0, 0x200, 0x200, 0x200, 0x600, 0xE00,
0xE00, 0x600, 0x200, 0x200, 0x200, 0, 0, 0};
/* Deprecated
static int power2[15] = {1, 2, 4, 8, 0x10, 0x20, 0x40, 0x80,
0x100, 0x200, 0x400, 0x800, 0x1000, 0x2000, 0x4000};
*/
/*
* g72x_init_state()
@ -684,10 +677,6 @@ static int g726_encode(int sl, struct g726_state *state_ptr)
return (i);
}
/*
* ------------ Asterisk-codec hooks. -------------------
*/
/*
* Private workspace for translating signed linear signals to G726.
* Don't bother to define two distinct structs.
@ -709,31 +698,35 @@ static int lintog726_new(struct ast_trans_pvt *pvt)
return 0;
}
/*! \brief decode packed 4-bit G726 values and store in buffer. */
static int g726tolin_framein (struct ast_trans_pvt *pvt, struct ast_frame *f)
/*! \brief decode packed 4-bit G726 values (AAL2 packing) and store in buffer. */
static int g726aal2tolin_framein (struct ast_trans_pvt *pvt, struct ast_frame *f)
{
struct g726_coder_pvt *tmp = pvt->pvt;
unsigned char *src = f->data;
int16_t *dst = (int16_t *)pvt->outbuf + pvt->samples;
int i;
int16_t *dst = (int16_t *) pvt->outbuf + pvt->samples;
unsigned int i;
for ( i = 0 ; i < f->datalen ; i++ ) {
for (i = 0; i < f->datalen; i++) {
*dst++ = g726_decode((src[i] >> 4) & 0xf, &tmp->g726);
*dst++ = g726_decode(src[i] & 0x0f, &tmp->g726);
}
pvt->samples += f->samples;
pvt->datalen += 2 * f->samples; /* 2 bytes/sample */
return 0;
}
/*! \brief compress and store data (4-bit G726 samples) in outbuf */
static int lintog726_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
/*! \brief compress and store data (4-bit G726 samples, AAL2 packing) in outbuf */
static int lintog726aal2_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
{
struct g726_coder_pvt *tmp = pvt->pvt;
int16_t *src = f->data;
int i;
for ( i = 0; i < f->samples; i++ ) {
unsigned int i;
for (i = 0; i < f->samples; i++) {
unsigned char d = g726_encode(src[i], &tmp->g726); /* this sample */
if (tmp->next_flag & 0x80) { /* merge with leftover sample */
pvt->outbuf[pvt->datalen++] = ((tmp->next_flag & 0xf)<< 4) | d;
pvt->samples += 2; /* 2 samples per byte */
@ -742,37 +735,92 @@ static int lintog726_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
tmp->next_flag = 0x80 | d;
}
}
return 0;
}
/*! \brief decode packed 4-bit G726 values (RFC3551 packing) and store in buffer. */
static int g726tolin_framein (struct ast_trans_pvt *pvt, struct ast_frame *f)
{
struct g726_coder_pvt *tmp = pvt->pvt;
unsigned char *src = f->data;
int16_t *dst = (int16_t *) pvt->outbuf + pvt->samples;
unsigned int i;
for (i = 0; i < f->datalen; i++) {
*dst++ = g726_decode(src[i] & 0x0f, &tmp->g726);
*dst++ = g726_decode((src[i] >> 4) & 0xf, &tmp->g726);
}
pvt->samples += f->samples;
pvt->datalen += 2 * f->samples; /* 2 bytes/sample */
return 0;
}
/*! \brief compress and store data (4-bit G726 samples, RFC3551 packing) in outbuf */
static int lintog726_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
{
struct g726_coder_pvt *tmp = pvt->pvt;
int16_t *src = f->data;
unsigned int i;
for (i = 0; i < f->samples; i++) {
unsigned char d = g726_encode(src[i], &tmp->g726); /* this sample */
if (tmp->next_flag & 0x80) { /* merge with leftover sample */
pvt->outbuf[pvt->datalen++] = (d << 4) | (tmp->next_flag & 0xf);
pvt->samples += 2; /* 2 samples per byte */
tmp->next_flag = 0;
} else {
tmp->next_flag = 0x80 | d;
}
}
return 0;
}
/*! \brief convert G726-32 RFC3551 packed data into AAL2 packed data (or vice-versa) */
static int g726tog726aal2_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
{
unsigned char *src = f->data;
unsigned char *dst = (unsigned char *) pvt->outbuf + pvt->samples;
unsigned int i;
for (i = 0; i < f->datalen; i++)
*dst++ = ((src[i] & 0xf) << 4) | (src[i] >> 4);
pvt->samples += f->samples;
pvt->datalen += f->samples; /* 1 byte/sample */
return 0;
}
/*! \brief G726ToLin_Sample */
static struct ast_frame *g726tolin_sample(void)
{
static struct ast_frame f;
f.frametype = AST_FRAME_VOICE;
f.subclass = AST_FORMAT_G726;
f.datalen = sizeof (g726_slin_ex);
f.samples = sizeof(g726_slin_ex) * 2; /* 2 samples per byte */
f.mallocd = 0;
f.offset = 0;
f.src = __PRETTY_FUNCTION__;
f.data = g726_slin_ex;
static struct ast_frame f = {
.frametype = AST_FRAME_VOICE,
.subclass = AST_FORMAT_G726,
.datalen = sizeof(g726_slin_ex),
.samples = sizeof(g726_slin_ex) * 2, /* 2 samples per byte */
.src = __PRETTY_FUNCTION__,
.data = g726_slin_ex,
};
return &f;
}
/*! \brief LinToG726_Sample */
static struct ast_frame *lintog726_sample (void)
{
static struct ast_frame f;
f.frametype = AST_FRAME_VOICE;
f.subclass = AST_FORMAT_SLINEAR;
f.datalen = sizeof (slin_g726_ex);
/* Assume 8000 Hz */
f.samples = sizeof (slin_g726_ex) / 2; /* 1 sample per 2 bytes */
f.mallocd = 0;
f.offset = 0;
f.src = __PRETTY_FUNCTION__;
f.data = slin_g726_ex;
static struct ast_frame f = {
.frametype = AST_FRAME_VOICE,
.subclass = AST_FORMAT_SLINEAR,
.datalen = sizeof(slin_g726_ex),
.samples = sizeof(slin_g726_ex) / 2, /* 1 sample per 2 bytes */
.src = __PRETTY_FUNCTION__,
.data = slin_g726_ex,
};
return &f;
}
@ -801,10 +849,56 @@ static struct ast_translator lintog726 = {
.buf_size = BUFFER_SAMPLES/2,
};
static struct ast_translator g726aal2tolin = {
.name = "g726aal2tolin",
.srcfmt = AST_FORMAT_G726_AAL2,
.dstfmt = AST_FORMAT_SLINEAR,
.newpvt = lintog726_new, /* same for both directions */
.framein = g726aal2tolin_framein,
.sample = g726tolin_sample,
.desc_size = sizeof(struct g726_coder_pvt),
.buffer_samples = BUFFER_SAMPLES,
.buf_size = BUFFER_SAMPLES * 2,
.plc_samples = 160,
};
static struct ast_translator lintog726aal2 = {
.name = "lintog726aal2",
.srcfmt = AST_FORMAT_SLINEAR,
.dstfmt = AST_FORMAT_G726_AAL2,
.newpvt = lintog726_new, /* same for both directions */
.framein = lintog726aal2_framein,
.sample = lintog726_sample,
.desc_size = sizeof(struct g726_coder_pvt),
.buffer_samples = BUFFER_SAMPLES,
.buf_size = BUFFER_SAMPLES / 2,
};
static struct ast_translator g726tog726aal2 = {
.name = "g726tog726aal2",
.srcfmt = AST_FORMAT_G726,
.dstfmt = AST_FORMAT_G726_AAL2,
.framein = g726tog726aal2_framein, /* same for both directions */
.sample = lintog726_sample,
.buffer_samples = BUFFER_SAMPLES,
.buf_size = BUFFER_SAMPLES,
};
static struct ast_translator g726aal2tog726 = {
.name = "g726aal2tog726",
.srcfmt = AST_FORMAT_G726_AAL2,
.dstfmt = AST_FORMAT_G726,
.framein = g726tog726aal2_framein, /* same for both directions */
.sample = lintog726_sample,
.buffer_samples = BUFFER_SAMPLES,
.buf_size = BUFFER_SAMPLES,
};
static void parse_config(void)
{
struct ast_variable *var;
struct ast_config *cfg = ast_config_load("codecs.conf");
if (!cfg)
return;
for (var = ast_variable_browse(cfg, "plc"); var; var = var->next) {
@ -818,31 +912,47 @@ static void parse_config(void)
ast_config_destroy(cfg);
}
/*! \brief standard module glue */
static int reload(void *mod)
{
parse_config();
return 0;
}
static int unload_module (void *mod)
{
int res;
res = ast_unregister_translator (&lintog726);
res |= ast_unregister_translator (&g726tolin);
int res = 0;
res |= ast_unregister_translator(&g726tolin);
res |= ast_unregister_translator(&lintog726);
res |= ast_unregister_translator(&g726aal2tolin);
res |= ast_unregister_translator(&lintog726aal2);
res |= ast_unregister_translator(&g726aal2tog726);
res |= ast_unregister_translator(&g726tog726aal2);
return res;
}
static int load_module (void *mod)
{
int res;
int res = 0;
parse_config();
res = ast_register_translator (&g726tolin, mod);
if (!res)
res = ast_register_translator (&lintog726, mod);
else
ast_unregister_translator (&g726tolin);
res |= ast_register_translator(&g726tolin, mod);
res |= ast_register_translator(&lintog726, mod);
res |= ast_register_translator(&g726aal2tolin, mod);
res |= ast_register_translator(&lintog726aal2, mod);
res |= ast_register_translator(&g726aal2tog726, mod);
res |= ast_register_translator(&g726tog726aal2, mod);
if (res)
unload_module(mod);
return res;
}
@ -855,4 +965,5 @@ static const char *key(void)
{
return ASTERISK_GPL_KEY;
}
STD_MOD(MOD_1, reload, NULL, NULL);

7
frame.c
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@ -81,17 +81,18 @@ static struct ast_format_list {
char *name; /*!< short name */
char *desc; /*!< Description */
} AST_FORMAT_LIST[] = { /*!< Bit number: comment - Bit numbers are hard coded in show_codec() */
{ 1, AST_FORMAT_G723_1 , "g723" , "G.723.1"}, /*!< 1: codec_g723_1.c */
{ 1, AST_FORMAT_G723_1 , "g723" , "G.723.1"}, /*!< 1 */
{ 1, AST_FORMAT_GSM, "gsm" , "GSM"}, /*!< 2: codec_gsm.c */
{ 1, AST_FORMAT_ULAW, "ulaw", "G.711 u-law" }, /*!< 3: codec_ulaw.c */
{ 1, AST_FORMAT_ALAW, "alaw", "G.711 A-law" }, /*!< 4: codec_alaw.c */
{ 1, AST_FORMAT_G726, "g726", "G.726" }, /*!< 5: codec_g726.c */
{ 1, AST_FORMAT_G726, "g726", "G.726 RFC3551" },/*!< 5: codec_g726.c */
{ 1, AST_FORMAT_ADPCM, "adpcm" , "ADPCM"}, /*!< 6: codec_adpcm.c */
{ 1, AST_FORMAT_SLINEAR, "slin", "16 bit Signed Linear PCM"}, /*!< 7 */
{ 1, AST_FORMAT_LPC10, "lpc10", "LPC10" }, /*!< 8: codec_lpc10.c */
{ 1, AST_FORMAT_G729A, "g729", "G.729A" }, /*!< 9: Binary commercial distribution */
{ 1, AST_FORMAT_SPEEX, "speex", "SpeeX" }, /*!< 10: codec_speex.c */
{ 1, AST_FORMAT_ILBC, "ilbc", "iLBC"}, /*!< 11: codec_ilbc.c */
{ 1, AST_FORMAT_G726_AAL2, "g726aal2", "G.726 AAL2" }, /*!< 12: codec_g726.c */
{ 0, 0, "nothing", "undefined" },
{ 0, 0, "nothing", "undefined" },
{ 0, 0, "nothing", "undefined" },
@ -1255,6 +1256,7 @@ int ast_codec_get_samples(struct ast_frame *f)
break;
case AST_FORMAT_ADPCM:
case AST_FORMAT_G726:
case AST_FORMAT_G726_AAL2:
samples = f->datalen * 2;
break;
default:
@ -1287,6 +1289,7 @@ int ast_codec_get_len(int format, int samples)
break;
case AST_FORMAT_ADPCM:
case AST_FORMAT_G726:
case AST_FORMAT_G726_AAL2:
len = samples / 2;
break;
default:

4
include/asterisk/frame.h
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@ -214,7 +214,7 @@ extern struct ast_frame ast_null_frame;
#define AST_FORMAT_ULAW (1 << 2)
/*! Raw A-law data (G.711) */
#define AST_FORMAT_ALAW (1 << 3)
/*! ADPCM (G.726, 32kbps) */
/*! ADPCM (G.726, 32kbps, RFC3551 codeword packing) */
#define AST_FORMAT_G726 (1 << 4)
/*! ADPCM (IMA) */
#define AST_FORMAT_ADPCM (1 << 5)
@ -228,6 +228,8 @@ extern struct ast_frame ast_null_frame;
#define AST_FORMAT_SPEEX (1 << 9)
/*! iLBC Free Compression */
#define AST_FORMAT_ILBC (1 << 10)
/*! ADPCM (G.726, 32kbps, AAL2 codeword packing) */
#define AST_FORMAT_G726_AAL2 (1 << 11)
/*! Maximum audio format */
#define AST_FORMAT_MAX_AUDIO (1 << 15)
/*! Maximum audio mask */

3
rtp.c
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@ -1182,6 +1182,7 @@ static struct {
{{1, AST_FORMAT_G729A}, "audio", "G729"},
{{1, AST_FORMAT_SPEEX}, "audio", "speex"},
{{1, AST_FORMAT_ILBC}, "audio", "iLBC"},
{{1, AST_FORMAT_G726_AAL2}, "audio", "AAL2-G726-32"},
{{0, AST_RTP_DTMF}, "audio", "telephone-event"},
{{0, AST_RTP_CISCO_DTMF}, "audio", "cisco-telephone-event"},
{{0, AST_RTP_CN}, "audio", "CN"},
@ -1223,6 +1224,7 @@ static struct rtpPayloadType static_RTP_PT[MAX_RTP_PT] = {
[101] = {0, AST_RTP_DTMF},
[110] = {1, AST_FORMAT_SPEEX},
[111] = {1, AST_FORMAT_G726},
[112] = {1, AST_FORMAT_G726_AAL2},
[121] = {0, AST_RTP_CISCO_DTMF}, /* Must be type 121 */
};
@ -2376,6 +2378,7 @@ int ast_rtp_write(struct ast_rtp *rtp, struct ast_frame *_f)
break;
case AST_FORMAT_ADPCM:
case AST_FORMAT_G726:
case AST_FORMAT_G726_AAL2:
if (!rtp->smoother) {
rtp->smoother = ast_smoother_new(80);
}

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