codec_builtin.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 2014, Digium, Inc.
 *
 * Joshua Colp <[email protected]>
 *
 * 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 Built-in supported codecs
 *
 * \author Joshua Colp <[email protected]>
 */

/*** MODULEINFO
 <support_level>core</support_level>
 ***/

#include "asterisk.h"

#include "asterisk/ilbc.h"
#include "asterisk/logger.h"
#include "asterisk/astobj2.h"
#include "asterisk/codec.h"
#include "asterisk/format.h"
#include "asterisk/format_cache.h"
#include "asterisk/frame.h"
#include "asterisk/smoother.h"

int __ast_codec_register_with_format(struct ast_codec *codec, const char *format_name,
 struct ast_module *mod);

enum frame_type {
 TYPE_HIGH, /* 0x0 */
 TYPE_LOW, /* 0x1 */
 TYPE_SILENCE, /* 0x2 */
 TYPE_DONTSEND /* 0x3 */
};

#define TYPE_MASK 0x3

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 (%u)\n", type);
 }
 return -1;
}

static int g723_samples(struct ast_frame *frame)
{
 unsigned char *buf = frame->data.ptr;
 int pos = 0, samples = 0, res;

 while(pos < frame->datalen) {
 res = g723_len(buf[pos]);
 if (res <= 0)
 break;
 samples += 240;
 pos += res;
 }

 return samples;
}

static int g723_length(unsigned int samples)
{
 return (samples / 240) * 20;
}

static struct ast_codec g723 = {
 .name = "g723",
 .description = "G.723.1",
 .type = AST_MEDIA_TYPE_AUDIO,
 .sample_rate = 8000,
 .minimum_ms = 30,
 .maximum_ms = 300,
 .default_ms = 30,
 .minimum_bytes = 20,
 .samples_count = g723_samples,
 .get_length = g723_length,
};

static int codec2_samples(struct ast_frame *frame)
{
 return 160 * (frame->datalen / 6);
}

static int codec2_length(unsigned int samples)
{
 return (samples / 160) * 6;
}

static struct ast_codec codec2 = {
 .name = "codec2",
 .description = "Codec 2",
 .type = AST_MEDIA_TYPE_AUDIO,
 .sample_rate = 8000,
 .minimum_ms = 20,
 .maximum_ms = 300,
 .default_ms = 20,
 .minimum_bytes = 6,
 .samples_count = codec2_samples,
 .get_length = codec2_length,
 .smooth = 1,
};

static int none_samples(struct ast_frame *frame)
{
 return frame->datalen;
}

static int none_length(unsigned int samples) {
 return samples;
}

static struct ast_codec none = {
 .name = "none",
 .description = "<Null> codec",
 .type = AST_MEDIA_TYPE_AUDIO,
 .sample_rate = 8000, /* This must have some sample rate to prevent divide by 0 */
 .minimum_ms = 10,
 .maximum_ms = 150,
 .default_ms = 20,
 .minimum_bytes = 20,
 .samples_count = none_samples,
 .get_length = none_length,
};

static int ulaw_samples(struct ast_frame *frame)
{
 return frame->datalen;
}

static int ulaw_length(unsigned int samples)
{
 return samples;
}

static struct ast_codec ulaw = {
 .name = "ulaw",
 .description = "G.711 u-law",
 .type = AST_MEDIA_TYPE_AUDIO,
 .sample_rate = 8000,
 .minimum_ms = 10,
 .maximum_ms = 150,
 .default_ms = 20,
 .minimum_bytes = 80,
 .samples_count = ulaw_samples,
 .get_length = ulaw_length,
 .smooth = 1,
};

static struct ast_codec alaw = {
 .name = "alaw",
 .description = "G.711 a-law",
 .type = AST_MEDIA_TYPE_AUDIO,
 .sample_rate = 8000,
 .minimum_ms = 10,
 .maximum_ms = 150,
 .default_ms = 20,
 .minimum_bytes = 80,
 .samples_count = ulaw_samples,
 .get_length = ulaw_length,
 .smooth = 1,
};

static int gsm_samples(struct ast_frame *frame)
{
 return 160 * (frame->datalen / 33);
}

static int gsm_length(unsigned int samples)
{
 return (samples / 160) * 33;
}

static struct ast_codec gsm = {
 .name = "gsm",
 .description = "GSM",
 .type = AST_MEDIA_TYPE_AUDIO,
 .sample_rate = 8000,
 .minimum_ms = 20,
 .maximum_ms = 300,
 .default_ms = 20,
 .minimum_bytes = 33,
 .samples_count = gsm_samples,
 .get_length = gsm_length,
 .smooth = 1,
};

static int g726_samples(struct ast_frame *frame)
{
 return frame->datalen * 2;
}

static int g726_length(unsigned int samples)
{
 return samples / 2;
}

static struct ast_codec g726rfc3551 = {
 .name = "g726",
 .description = "G.726 RFC3551",
 .type = AST_MEDIA_TYPE_AUDIO,
 .sample_rate = 8000,
 .minimum_ms = 10,
 .maximum_ms = 300,
 .default_ms = 20,
 .minimum_bytes = 40,
 .samples_count = g726_samples,
 .get_length = g726_length,
 .smooth = 1,
};

static struct ast_codec g726aal2 = {
 .name = "g726aal2",
 .description = "G.726 AAL2",
 .type = AST_MEDIA_TYPE_AUDIO,
 .sample_rate = 8000,
 .minimum_ms = 10,
 .maximum_ms = 300,
 .default_ms = 20,
 .minimum_bytes = 40,
 .samples_count = g726_samples,
 .get_length = g726_length,
 .smooth = 1,
};

static struct ast_codec adpcm = {
 .name = "adpcm",
 .description = "Dialogic ADPCM",
 .type = AST_MEDIA_TYPE_AUDIO,
 .sample_rate = 8000,
 .minimum_ms = 10,
 .maximum_ms = 300,
 .default_ms = 20,
 .minimum_bytes = 40,
 .samples_count = g726_samples,
 .get_length = g726_length,
 .smooth = 1,
};

static int slin_samples(struct ast_frame *frame)
{
 return frame->datalen / 2;
}

static int slin_length(unsigned int samples)
{
 return samples * 2;
}

static struct ast_codec slin8 = {
 .name = "slin",
 .description = "16 bit Signed Linear PCM",
 .type = AST_MEDIA_TYPE_AUDIO,
 .sample_rate = 8000,
 .minimum_ms = 10,
 .maximum_ms = 70,
 .default_ms = 20,
 .minimum_bytes = 160,
 .samples_count = slin_samples,
 .get_length = slin_length,
 .smooth = 1,
 .smoother_flags = AST_SMOOTHER_FLAG_BE | AST_SMOOTHER_FLAG_FORCED,
};

static struct ast_codec slin12 = {
 .name = "slin",
 .description = "16 bit Signed Linear PCM (12kHz)",
 .type = AST_MEDIA_TYPE_AUDIO,
 .sample_rate = 12000,
 .minimum_ms = 10,
 .maximum_ms = 70,
 .default_ms = 20,
 .minimum_bytes = 240,
 .samples_count = slin_samples,
 .get_length = slin_length,
 .smooth = 1,
 .smoother_flags = AST_SMOOTHER_FLAG_BE | AST_SMOOTHER_FLAG_FORCED,
};

static struct ast_codec slin16 = {
 .name = "slin",
 .description = "16 bit Signed Linear PCM (16kHz)",
 .type = AST_MEDIA_TYPE_AUDIO,
 .sample_rate = 16000,
 .minimum_ms = 10,
 .maximum_ms = 70,
 .default_ms = 20,
 .minimum_bytes = 320,
 .samples_count = slin_samples,
 .get_length = slin_length,
 .smooth = 1,
 .smoother_flags = AST_SMOOTHER_FLAG_BE | AST_SMOOTHER_FLAG_FORCED,
};

static struct ast_codec slin24 = {
 .name = "slin",
 .description = "16 bit Signed Linear PCM (24kHz)",
 .type = AST_MEDIA_TYPE_AUDIO,
 .sample_rate = 24000,
 .minimum_ms = 10,
 .maximum_ms = 70,
 .default_ms = 20,
 .minimum_bytes = 480,
 .samples_count = slin_samples,
 .get_length = slin_length,
 .smooth = 1,
 .smoother_flags = AST_SMOOTHER_FLAG_BE | AST_SMOOTHER_FLAG_FORCED,
};

static struct ast_codec slin32 = {
 .name = "slin",
 .description = "16 bit Signed Linear PCM (32kHz)",
 .type = AST_MEDIA_TYPE_AUDIO,
 .sample_rate = 32000,
 .minimum_ms = 10,
 .maximum_ms = 70,
 .default_ms = 20,
 .minimum_bytes = 640,
 .samples_count = slin_samples,
 .get_length = slin_length,
 .smooth = 1,
 .smoother_flags = AST_SMOOTHER_FLAG_BE | AST_SMOOTHER_FLAG_FORCED,
};

static struct ast_codec slin44 = {
 .name = "slin",
 .description = "16 bit Signed Linear PCM (44kHz)",
 .type = AST_MEDIA_TYPE_AUDIO,
 .sample_rate = 44100,
 .minimum_ms = 10,
 .maximum_ms = 70,
 .default_ms = 20,
 .minimum_bytes = 882,
 .samples_count = slin_samples,
 .get_length = slin_length,
 .smooth = 1,
 .smoother_flags = AST_SMOOTHER_FLAG_BE | AST_SMOOTHER_FLAG_FORCED,
};

static struct ast_codec slin48 = {
 .name = "slin",
 .description = "16 bit Signed Linear PCM (48kHz)",
 .type = AST_MEDIA_TYPE_AUDIO,
 .sample_rate = 48000,
 .minimum_ms = 10,
 .maximum_ms = 70,
 .default_ms = 20,
 .minimum_bytes = 960,
 .samples_count = slin_samples,
 .get_length = slin_length,
 .smooth = 1,
 .smoother_flags = AST_SMOOTHER_FLAG_BE | AST_SMOOTHER_FLAG_FORCED,
};

static struct ast_codec slin96 = {
 .name = "slin",
 .description = "16 bit Signed Linear PCM (96kHz)",
 .type = AST_MEDIA_TYPE_AUDIO,
 .sample_rate = 96000,
 .minimum_ms = 10,
 .maximum_ms = 70,
 .default_ms = 20,
 .minimum_bytes = 1920,
 .samples_count = slin_samples,
 .get_length = slin_length,
 .smooth = 1,
 .smoother_flags = AST_SMOOTHER_FLAG_BE | AST_SMOOTHER_FLAG_FORCED,
};

static struct ast_codec slin192 = {
 .name = "slin",
 .description = "16 bit Signed Linear PCM (192kHz)",
 .type = AST_MEDIA_TYPE_AUDIO,
 .sample_rate = 192000,
 .minimum_ms = 10,
 .maximum_ms = 70,
 .default_ms = 20,
 .minimum_bytes = 3840,
 .samples_count = slin_samples,
 .get_length = slin_length,
 .smooth = 1,
 .smoother_flags = AST_SMOOTHER_FLAG_BE | AST_SMOOTHER_FLAG_FORCED,
};

static int lpc10_samples(struct ast_frame *frame)
{
 int samples = 22 * 8;

 /* assumes that the RTP packet contains one LPC10 frame */
 samples += (((char *)(frame->data.ptr))[7] & 0x1) * 8;

 return samples;
}

static struct ast_codec lpc10 = {
 .name = "lpc10",
 .description = "LPC10",
 .type = AST_MEDIA_TYPE_AUDIO,
 .sample_rate = 8000,
 .minimum_ms = 20,
 .maximum_ms = 20,
 .default_ms = 20,
 .minimum_bytes = 7,
 .samples_count = lpc10_samples,
 .smooth = 1,
};

static int g729_samples(struct ast_frame *frame)
{
 return frame->datalen * 8;
}

static int g729_length(unsigned int samples)
{
 return samples / 8;
}

static struct ast_codec g729a = {
 .name = "g729",
 .description = "G.729A",
 .type = AST_MEDIA_TYPE_AUDIO,
 .sample_rate = 8000,
 .minimum_ms = 10,
 .maximum_ms = 230,
 .default_ms = 20,
 .minimum_bytes = 10,
 .samples_count = g729_samples,
 .get_length = g729_length,
 .smooth = 1,
};

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;
}

static int speex8_samples(struct ast_frame *frame)
{
 return speex_samples(frame->data.ptr, frame->datalen);
}

static struct ast_codec speex8 = {
 .name = "speex",
 .description = "SpeeX",
 .type = AST_MEDIA_TYPE_AUDIO,
 .sample_rate = 8000,
 .minimum_ms = 10,
 .maximum_ms = 60,
 .default_ms = 20,
 .minimum_bytes = 10,
 .samples_count = speex8_samples,
};

static int speex16_samples(struct ast_frame *frame)
{
 return 2 * speex_samples(frame->data.ptr, frame->datalen);
}

static struct ast_codec speex16 = {
 .name = "speex",
 .description = "SpeeX 16khz",
 .type = AST_MEDIA_TYPE_AUDIO,
 .sample_rate = 16000,
 .minimum_ms = 10,
 .maximum_ms = 60,
 .default_ms = 20,
 .minimum_bytes = 10,
 .samples_count = speex16_samples,
};

static int speex32_samples(struct ast_frame *frame)
{
 return 4 * speex_samples(frame->data.ptr, frame->datalen);
}

static struct ast_codec speex32 = {
 .name = "speex",
 .description = "SpeeX 32khz",
 .type = AST_MEDIA_TYPE_AUDIO,
 .sample_rate = 32000,
 .minimum_ms = 10,
 .maximum_ms = 60,
 .default_ms = 20,
 .minimum_bytes = 10,
 .samples_count = speex32_samples,
};

static int ilbc_samples(struct ast_frame *frame)
{
 struct ilbc_attr *attr = ast_format_get_attribute_data(frame->subclass.format);
 const unsigned int mode = attr ? attr->mode : 30;
 const unsigned int samples_per_frame = mode * ast_format_get_sample_rate(frame->subclass.format) / 1000;
 const unsigned int octets_per_frame = (mode == 20) ? 38 : 50;

 return samples_per_frame * frame->datalen / octets_per_frame;
}

static struct ast_codec ilbc = {
 .name = "ilbc",
 .description = "iLBC",
 .type = AST_MEDIA_TYPE_AUDIO,
 .sample_rate = 8000,
 .minimum_ms = 20,
 .maximum_ms = 300,
 .default_ms = 20,
 .minimum_bytes = 38,
 .samples_count = ilbc_samples,
 .smooth = 0,
};

static struct ast_codec g722 = {
 .name = "g722",
 .description = "G722",
 .type = AST_MEDIA_TYPE_AUDIO,
 .sample_rate = 16000,
 .minimum_ms = 10,
 .maximum_ms = 150,
 .default_ms = 20,
 .minimum_bytes = 80,
 .samples_count = g726_samples,
 .get_length = g726_length,
 .smooth = 1,
};

static int siren7_samples(struct ast_frame *frame)
{
 return frame->datalen * (16000 / 4000);
}

static int siren7_length(unsigned int samples)
{
 return samples / (16000 / 4000);
}

static struct ast_codec siren7 = {
 .name = "siren7",
 .description = "ITU G.722.1 (Siren7, licensed from Polycom)",
 .type = AST_MEDIA_TYPE_AUDIO,
 .sample_rate = 16000,
 .minimum_ms = 20,
 .maximum_ms = 80,
 .default_ms = 20,
 .minimum_bytes = 80,
 .samples_count = siren7_samples,
 .get_length = siren7_length,
};

static int siren14_samples(struct ast_frame *frame)
{
 return (int) frame->datalen * ((float) 32000 / 6000);
}

static int siren14_length(unsigned int samples)
{
 return (int) samples / ((float) 32000 / 6000);;
}

static struct ast_codec siren14 = {
 .name = "siren14",
 .description = "ITU G.722.1 Annex C, (Siren14, licensed from Polycom)",
 .type = AST_MEDIA_TYPE_AUDIO,
 .sample_rate = 32000,
 .minimum_ms = 20,
 .maximum_ms = 80,
 .default_ms = 20,
 .minimum_bytes = 120,
 .samples_count = siren14_samples,
 .get_length = siren14_length,
};

static struct ast_codec testlaw = {
 .name = "testlaw",
 .description = "G.711 test-law",
 .type = AST_MEDIA_TYPE_AUDIO,
 .sample_rate = 8000,
 .minimum_ms = 10,
 .maximum_ms = 150,
 .default_ms = 20,
 .minimum_bytes = 80,
 .samples_count = ulaw_samples,
 .get_length = ulaw_length,
 .smooth = 1,
};

static int g719_samples(struct ast_frame *frame)
{
 return (int) frame->datalen * ((float) 48000 / 8000);
}

static int g719_length(unsigned int samples)
{
 return (int) samples / ((float) 48000 / 8000);
}

static struct ast_codec g719 = {
 .name = "g719",
 .description = "ITU G.719",
 .type = AST_MEDIA_TYPE_AUDIO,
 .sample_rate = 48000,
 .minimum_ms = 20,
 .maximum_ms = 80,
 .default_ms = 20,
 .minimum_bytes = 160,
 .samples_count = g719_samples,
 .get_length = g719_length,
};

static int opus_samples(struct ast_frame *frame)
{
 /*
 * XXX This is likely not at all what's intended from this
 * callback. If you have codec_opus.so loaded then this
 * function is overridden anyway. However, since opus is
 * variable bit rate and I cannot extract the calculation code
 * from the opus library, I am going to punt and assume 20ms
 * worth of samples. In testing, this has worked just fine.
 * Pass through support doesn't seem to care about the value
 * returned anyway.
 */
 return ast_format_get_sample_rate(frame->subclass.format) / 50;
}

static struct ast_codec opus = {
 .name = "opus",
 .description = "Opus Codec",
 .type = AST_MEDIA_TYPE_AUDIO,
 .sample_rate = 48000,
 .minimum_ms = 20,
 .maximum_ms = 60,
 .default_ms = 20,
 .samples_count = opus_samples,
 .minimum_bytes = 10,
};

static struct ast_codec jpeg = {
 .name = "jpeg",
 .description = "JPEG image",
 .type = AST_MEDIA_TYPE_IMAGE,
};

static struct ast_codec png = {
 .name = "png",
 .description = "PNG Image",
 .type = AST_MEDIA_TYPE_IMAGE,
};

static struct ast_codec h261 = {
 .name = "h261",
 .description = "H.261 video",
 .type = AST_MEDIA_TYPE_VIDEO,
 .sample_rate = 1000,
};

static struct ast_codec h263 = {
 .name = "h263",
 .description = "H.263 video",
 .type = AST_MEDIA_TYPE_VIDEO,
 .sample_rate = 1000,
};

static struct ast_codec h263p = {
 .name = "h263p",
 .description = "H.263+ video",
 .type = AST_MEDIA_TYPE_VIDEO,
 .sample_rate = 1000,
};

static struct ast_codec h264 = {
 .name = "h264",
 .description = "H.264 video",
 .type = AST_MEDIA_TYPE_VIDEO,
 .sample_rate = 1000,
};

static struct ast_codec h265 = {
 .name = "h265",
 .description = "H.265 video",
 .type = AST_MEDIA_TYPE_VIDEO,
 .sample_rate = 1000,
};

static struct ast_codec mpeg4 = {
 .name = "mpeg4",
 .description = "MPEG4 video",
 .type = AST_MEDIA_TYPE_VIDEO,
 .sample_rate = 1000,
};

static struct ast_codec vp8 = {
 .name = "vp8",
 .description = "VP8 video",
 .type = AST_MEDIA_TYPE_VIDEO,
 .sample_rate = 1000,
};

static struct ast_codec vp9 = {
 .name = "vp9",
 .description = "VP9 video",
 .type = AST_MEDIA_TYPE_VIDEO,
 .sample_rate = 1000,
};

static struct ast_codec t140red = {
 .name = "red",
 .description = "T.140 Realtime Text with redundancy",
 .type = AST_MEDIA_TYPE_TEXT,
};

static struct ast_codec t140 = {
 .name = "t140",
 .description = "Passthrough T.140 Realtime Text",
 .type = AST_MEDIA_TYPE_TEXT,
};

static struct ast_codec t38 = {
 .name = "t38",
 .description = "T.38 UDPTL Fax",
 .type = AST_MEDIA_TYPE_IMAGE,
};

static int silk_samples(struct ast_frame *frame)
{
 /* XXX This is likely not at all what's intended from this callback. However,
 * since SILK is variable bit rate, I have no idea how to take a frame of data
 * and determine the number of samples present. Instead, we base this on the
 * sample rate of the codec and the expected number of samples to receive in 20ms.
 * In testing, this has worked just fine.
 */
 return ast_format_get_sample_rate(frame->subclass.format) / 50;
}

static struct ast_codec silk8 = {
 .name = "silk",
 .description = "SILK Codec (8 KHz)",
 .type = AST_MEDIA_TYPE_AUDIO,
 .sample_rate = 8000,
 .minimum_ms = 20,
 .maximum_ms = 100,
 .default_ms = 20,
 .minimum_bytes = 160,
 .samples_count = silk_samples
};

static struct ast_codec silk12 = {
 .name = "silk",
 .description = "SILK Codec (12 KHz)",
 .type = AST_MEDIA_TYPE_AUDIO,
 .sample_rate = 12000,
 .minimum_ms = 20,
 .maximum_ms = 100,
 .default_ms = 20,
 .minimum_bytes = 240,
 .samples_count = silk_samples
};

static struct ast_codec silk16 = {
 .name = "silk",
 .description = "SILK Codec (16 KHz)",
 .type = AST_MEDIA_TYPE_AUDIO,
 .sample_rate = 16000,
 .minimum_ms = 20,
 .maximum_ms = 100,
 .default_ms = 20,
 .minimum_bytes = 320,
 .samples_count = silk_samples
};

static struct ast_codec silk24 = {
 .name = "silk",
 .description = "SILK Codec (24 KHz)",
 .type = AST_MEDIA_TYPE_AUDIO,
 .sample_rate = 24000,
 .minimum_ms = 20,
 .maximum_ms = 100,
 .default_ms = 20,
 .minimum_bytes = 480,
 .samples_count = silk_samples
};

#define CODEC_REGISTER_AND_CACHE(codec) \
 ({ \
 int __res_ ## __LINE__ = 0; \
 struct ast_format *__fmt_ ## __LINE__; \
 struct ast_codec *__codec_ ## __LINE__; \
 res |= __ast_codec_register_with_format(&(codec), (codec).name, NULL); \
 __codec_ ## __LINE__ = ast_codec_get((codec).name, (codec).type, (codec).sample_rate); \
 __fmt_ ## __LINE__ = __codec_ ## __LINE__ ? ast_format_create(__codec_ ## __LINE__) : NULL; \
 res |= ast_format_cache_set(__fmt_ ## __LINE__); \
 ao2_ref(__fmt_ ## __LINE__, -1); \
 ao2_ref(__codec_ ## __LINE__, -1); \
 __res_ ## __LINE__; \
 })

#define CODEC_REGISTER_AND_CACHE_NAMED(fmt_name, codec) \
 ({ \
 int __res_ ## __LINE__ = 0; \
 struct ast_format *__fmt_ ## __LINE__; \
 struct ast_codec *__codec_ ## __LINE__; \
 res |= __ast_codec_register_with_format(&(codec), fmt_name, NULL); \
 __codec_ ## __LINE__ = ast_codec_get((codec).name, (codec).type, (codec).sample_rate); \
 __fmt_ ## __LINE__ = ast_format_create_named((fmt_name), __codec_ ## __LINE__); \
 res |= ast_format_cache_set(__fmt_ ## __LINE__); \
 ao2_ref(__fmt_ ## __LINE__, -1); \
 ao2_ref(__codec_ ## __LINE__, -1); \
 __res_ ## __LINE__; \
 })

int ast_codec_builtin_init(void)
{
 int res = 0;

 res |= CODEC_REGISTER_AND_CACHE(codec2);
 res |= CODEC_REGISTER_AND_CACHE(g723);
 res |= CODEC_REGISTER_AND_CACHE(ulaw);
 res |= CODEC_REGISTER_AND_CACHE(alaw);
 res |= CODEC_REGISTER_AND_CACHE(gsm);
 res |= CODEC_REGISTER_AND_CACHE(g726rfc3551);
 res |= CODEC_REGISTER_AND_CACHE(g726aal2);
 res |= CODEC_REGISTER_AND_CACHE(adpcm);
 res |= CODEC_REGISTER_AND_CACHE(slin8);
 res |= CODEC_REGISTER_AND_CACHE_NAMED("slin12", slin12);
 res |= CODEC_REGISTER_AND_CACHE_NAMED("slin16", slin16);
 res |= CODEC_REGISTER_AND_CACHE_NAMED("slin24", slin24);
 res |= CODEC_REGISTER_AND_CACHE_NAMED("slin32", slin32);
 res |= CODEC_REGISTER_AND_CACHE_NAMED("slin44", slin44);
 res |= CODEC_REGISTER_AND_CACHE_NAMED("slin48", slin48);
 res |= CODEC_REGISTER_AND_CACHE_NAMED("slin96", slin96);
 res |= CODEC_REGISTER_AND_CACHE_NAMED("slin192", slin192);
 res |= CODEC_REGISTER_AND_CACHE(lpc10);
 res |= CODEC_REGISTER_AND_CACHE(g729a);
 res |= CODEC_REGISTER_AND_CACHE(speex8);
 res |= CODEC_REGISTER_AND_CACHE_NAMED("speex16", speex16);
 res |= CODEC_REGISTER_AND_CACHE_NAMED("speex32", speex32);
 res |= CODEC_REGISTER_AND_CACHE(ilbc);
 res |= CODEC_REGISTER_AND_CACHE(g722);
 res |= CODEC_REGISTER_AND_CACHE(siren7);
 res |= CODEC_REGISTER_AND_CACHE(siren14);
 res |= CODEC_REGISTER_AND_CACHE(testlaw);
 res |= CODEC_REGISTER_AND_CACHE(g719);
 res |= CODEC_REGISTER_AND_CACHE(opus);
 res |= CODEC_REGISTER_AND_CACHE(jpeg);
 res |= CODEC_REGISTER_AND_CACHE(png);
 res |= CODEC_REGISTER_AND_CACHE(h261);
 res |= CODEC_REGISTER_AND_CACHE(h263);
 res |= CODEC_REGISTER_AND_CACHE(h263p);
 res |= CODEC_REGISTER_AND_CACHE(h264);
 res |= CODEC_REGISTER_AND_CACHE(h265);
 res |= CODEC_REGISTER_AND_CACHE(mpeg4);
 res |= CODEC_REGISTER_AND_CACHE(vp8);
 res |= CODEC_REGISTER_AND_CACHE(vp9);
 res |= CODEC_REGISTER_AND_CACHE(t140red);
 res |= CODEC_REGISTER_AND_CACHE(t140);
 res |= CODEC_REGISTER_AND_CACHE(t38);
 res |= CODEC_REGISTER_AND_CACHE(none);
 res |= CODEC_REGISTER_AND_CACHE_NAMED("silk8", silk8);
 res |= CODEC_REGISTER_AND_CACHE_NAMED("silk12", silk12);
 res |= CODEC_REGISTER_AND_CACHE_NAMED("silk16", silk16);
 res |= CODEC_REGISTER_AND_CACHE_NAMED("silk24", silk24);

 return res;
}