Skip to content
Snippets Groups Projects
codec_g723_1.c 7.58 KiB
Newer Older
  • Learn to ignore specific revisions
  • Mark Spencer's avatar
    Mark Spencer committed
    /*
    
     * Asterisk -- An open source telephony toolkit.
    
    Mark Spencer's avatar
    Mark Spencer committed
     *
     * The G.723.1 code is not included in the Asterisk distribution because
     * it is covered with patents, and in spite of statements to the contrary,
     * the "technology" is extremely expensive to license.
     * 
    
     * Copyright (C) 1999 - 2005, Digium, Inc.
     *
     * Mark Spencer <markster@digium.com>
    
    Mark Spencer's avatar
    Mark Spencer committed
     *
    
     * 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.
    
    Mark Spencer's avatar
    Mark Spencer committed
     *
     * 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.
     */
    
    
     * \brief Translate between signed linear and G.723.1
    
    Russell Bryant's avatar
    Russell Bryant committed
     * \ingroup codecs
    
    /*** MODULEINFO
    	<defaultenabled>no</defaultenabled>
     ***/
    
    
    #include "asterisk.h"
    
    ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
    
    Mark Spencer's avatar
    Mark Spencer committed
    #include <sys/types.h>
    
    Mark Spencer's avatar
    Mark Spencer committed
    #include <fcntl.h>
    #include <stdlib.h>
    #include <unistd.h>
    #include <netinet/in.h>
    #include <string.h>
    #include <stdio.h>
    
    
    Kevin P. Fleming's avatar
    Kevin P. Fleming committed
    #include "asterisk/lock.h"
    #include "asterisk/translate.h"
    #include "asterisk/module.h"
    #include "asterisk/logger.h"
    #include "asterisk/channel.h"
    
    #include "asterisk/utils.h"
    
    Mark Spencer's avatar
    Mark Spencer committed
    #ifdef ANNEX_B
    #include "g723.1b/typedef2.h"
    #include "g723.1b/cst2.h"
    #include "g723.1b/coder2.h"
    #include "g723.1b/decod2.h"
    #include "g723.1b/deccng2.h"
    #include "g723.1b/codcng2.h"
    #include "g723.1b/vad2.h"
    #else
    #include "g723.1/typedef.h"
    #include "g723.1/cst_lbc.h"
    #include "g723.1/coder.h"
    #include "g723.1/decod.h"
    #include "g723.1/dec_cng.h"
    #include "g723.1/cod_cng.h"
    #include "g723.1/vad.h"
    #endif
    
    /* Sample frame data */
    #include "slin_g723_ex.h"
    #include "g723_slin_ex.h"
    
    
    #define TYPE_HIGH	 0x0
    #define TYPE_LOW	 0x1
    #define TYPE_SILENCE	 0x2
    #define TYPE_DONTSEND	 0x3
    #define TYPE_MASK	 0x3
    
    
    /* g723_1 has 240 samples per buffer.
     * We want a buffer which is a multiple...
     */
    #define	G723_SAMPLES	240
    #define	BUFFER_SAMPLES	8160	/* 240 * 34 */
    
    Mark Spencer's avatar
    Mark Spencer committed
    
    /* Globals */
    Flag UsePf = True;
    Flag UseHp = True;
    Flag UseVx = True;
    
    enum Crate WrkRate = Rate63;
    
    struct g723_encoder_pvt {
    	struct cod_state cod;
    
    	int16_t buf[BUFFER_SAMPLES];	/* input buffer */
    
    Mark Spencer's avatar
    Mark Spencer committed
    };
    
    struct g723_decoder_pvt {
    	struct dec_state dec;
    };
    
    
    static struct ast_trans_pvt *g723tolin_new(struct ast *pvt)
    
    Mark Spencer's avatar
    Mark Spencer committed
    {
    
    	struct g723_decoder_pvt *tmp = pvt;
    
    	Init_Decod(&tmp->dec);
    	Init_Dec_Cng(&tmp->dec);
    	return tmp;
    
    static struct ast_frame *lintog723_sample(void)
    
    Mark Spencer's avatar
    Mark Spencer committed
    {
    	static struct ast_frame f;
    	f.frametype = AST_FRAME_VOICE;
    	f.subclass = AST_FORMAT_SLINEAR;
    	f.datalen = sizeof(slin_g723_ex);
    
    Mark Spencer's avatar
    Mark Spencer committed
    	f.samples = sizeof(slin_g723_ex)/2;
    
    Mark Spencer's avatar
    Mark Spencer committed
    	f.mallocd = 0;
    	f.offset = 0;
    	f.src = __PRETTY_FUNCTION__;
    	f.data = slin_g723_ex;
    	return &f;
    }
    
    
    static struct ast_frame *g723tolin_sample(void)
    
    Mark Spencer's avatar
    Mark Spencer committed
    {
    	static struct ast_frame f;
    	f.frametype = AST_FRAME_VOICE;
    	f.subclass = AST_FORMAT_G723_1;
    	f.datalen = sizeof(g723_slin_ex);
    	/* All frames are 30 ms long */
    
    Mark Spencer's avatar
    Mark Spencer committed
    	f.samples = 240;
    
    Mark Spencer's avatar
    Mark Spencer committed
    	f.mallocd = 0;
    	f.offset = 0;
    	f.src = __PRETTY_FUNCTION__;
    	f.data = g723_slin_ex;
    	return &f;
    }
    
    
    Mark Spencer's avatar
    Mark Spencer committed
    {
    
    	struct g723_encoder_pvt *tmp = pvt;
    	Init_Coder(&tmp->cod);
    	/* Init Comfort Noise Functions */
    	if( UseVx ) {
    		Init_Vad(&tmp->cod);
    		Init_Cod_Cng(&tmp->cod);
    
    Mark Spencer's avatar
    Mark Spencer committed
    	}
    
    Mark Spencer's avatar
    Mark Spencer committed
    static int g723_len(unsigned char buf)
    {
    	switch(buf & TYPE_MASK) {
    
    Mark Spencer's avatar
    Mark Spencer committed
    	case TYPE_DONTSEND:
    		return 0;
    		break;
    
    Mark Spencer's avatar
    Mark Spencer committed
    	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", buf & TYPE_MASK);
    	}
    	return -1;
    }
    
    
    static int g723tolin_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
    
    Mark Spencer's avatar
    Mark Spencer committed
    {
    
    	struct g723_decoder_pvt *tmp = pvt->pvt;
    
    Mark Spencer's avatar
    Mark Spencer committed
    	int len = 0;
    	int res;
    
    Mark Spencer's avatar
    Mark Spencer committed
    #ifdef  ANNEX_B
    	FLOAT tmpdata[Frame];
    	int x;
    #endif
    
    Mark Spencer's avatar
    Mark Spencer committed
    	while(len < f->datalen) {
    		/* Assuming there's space left, decode into the current buffer at
    		   the tail location */
    
    Mark Spencer's avatar
    Mark Spencer committed
    		if (res < 0) {
    			ast_log(LOG_WARNING, "Invalid data\n");
    			return -1;
    		}
    		if (res + len > f->datalen) {
    			ast_log(LOG_WARNING, "Measured length exceeds frame length\n");
    			return -1;
    		}
    
    		if (pvt->samples + Frame > BUFFER_SAMPLES) {	
    
    Mark Spencer's avatar
    Mark Spencer committed
    			ast_log(LOG_WARNING, "Out of buffer space\n");
    			return -1;
    		}
    
    #ifdef ANNEX_B
    		Decod(&tmp->dec, tmpdata, f->data + len, 0);
    		for (x=0;x<Frame;x++)
    			dst[pvt->samples + x] = (int16_t)(tmpdata[x]); 
    #else
    		Decod(&tmp->dec, dst + pvt->samples, f->data + len, 0);
    #endif
    		pvt->samples += Frame;
    		pvt->datalen += 2*Frame; /* 2 bytes/sample */
    
    Mark Spencer's avatar
    Mark Spencer committed
    		len += res;
    
    Mark Spencer's avatar
    Mark Spencer committed
    	}
    	return 0;
    }
    
    
    static int lintog723_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
    
    Mark Spencer's avatar
    Mark Spencer committed
    {
    	/* Just add the frames to our stream */
    	/* XXX We should look at how old the rest of our stream is, and if it
    	   is too old, then we should overwrite it entirely, otherwise we can
    	   get artifacts of earlier talk that do not belong */
    
    	struct g723_encoder_pvt *tmp = pvt->pvt;
    
    	if (tmp->samples + f->samples > BUFFER_SAMPLES) {
    
    Mark Spencer's avatar
    Mark Spencer committed
    		ast_log(LOG_WARNING, "Out of buffer space\n");
    		return -1;
    	}
    
    	memcpy(&tmp->buf[pvt->samples], f->data, f->datalen);
    	pvt->samples += f->samples;
    
    Mark Spencer's avatar
    Mark Spencer committed
    	return 0;
    }
    
    
    static struct ast_frame *lintog723_frameout(void *pvt)
    
    Mark Spencer's avatar
    Mark Spencer committed
    {
    	struct g723_encoder_pvt *tmp = (struct g723_encoder_pvt *)pvt;
    
    	int samples = 0;	/* how many samples in buffer */
    
    Mark Spencer's avatar
    Mark Spencer committed
    #ifdef ANNEX_B
    	int x;
    	FLOAT tmpdata[Frame];
    #endif
    
    Mark Spencer's avatar
    Mark Spencer committed
    	/* We can't work on anything less than a frame in size */
    
    Mark Spencer's avatar
    Mark Spencer committed
    		return NULL;
    
    Mark Spencer's avatar
    Mark Spencer committed
    		/* Encode a frame of data */
    
    		/* at most 24 bytes/frame... */
    		if (cnt + 24 > pvt->buf_size) {
    
    Mark Spencer's avatar
    Mark Spencer committed
    			ast_log(LOG_WARNING, "Out of buffer space\n");
    			return NULL;
    		}
    #ifdef ANNEX_B
    
    Mark Spencer's avatar
    Mark Spencer committed
    			tmpdata[x] = tmp->buf[x];
    
    		Coder(&tmp->cod, tmpdata, pvt->outbuf + cnt);
    
    Mark Spencer's avatar
    Mark Spencer committed
    #else
    
    		Coder(&tmp->cod, tmp->buf, pvt->outbuf + cnt);
    
    Mark Spencer's avatar
    Mark Spencer committed
    #endif
    		/* Assume 8000 Hz */
    
    Mark Spencer's avatar
    Mark Spencer committed
    		cnt += g723_len(tmp->outbuf[cnt]);
    
    Mark Spencer's avatar
    Mark Spencer committed
    		/* Move the data at the end of the buffer to the front */
    
    		/* XXX inefficient... */
    		if (pvt->samples)
    			memmove(tmp->buf, tmp->buf + Frame, pvt->samples * 2);
    
    Mark Spencer's avatar
    Mark Spencer committed
    	}
    
    	return ast_trans_frameout(pvt, cnt, samples);
    
    static struct ast_translator g723tolin = {
    	.name =
    
    Mark Spencer's avatar
    Mark Spencer committed
    #ifdef ANNEX_B
    
    Mark Spencer's avatar
    Mark Spencer committed
    #else
    
    Mark Spencer's avatar
    Mark Spencer committed
    #endif
    
    	.srcfmt = AST_FORMAT_G723_1,
    	.dstfmt =  AST_FORMAT_SLINEAR,
    	.newpvt = g723tolin_new,
    	.framein = g723tolin_framein,
    	.sample = g723tolin_sample,
    	.desc_size = sizeof(struct ...),
    };
    
    static struct ast_translator lintog723 = {
    	.name =
    
    Mark Spencer's avatar
    Mark Spencer committed
    #ifdef ANNEX_B
    
    Mark Spencer's avatar
    Mark Spencer committed
    #else
    
    Mark Spencer's avatar
    Mark Spencer committed
    #endif
    
    	.srcfmt = AST_FORMAT_SLINEAR,
    	.dstfmt =  AST_FORMAT_G723_1,
    	.new = lintog723_new,
    	.framein = lintog723_framein,
    	.frameout = lintog723_frameout,
    	.destroy = g723_destroy,
    	.sample = lintog723_sample,
    	.desc_size = sizeof(struct ...),
    };
    
    /*! \brief standard module glue */
    
    static int unload_module(void *mod)
    
    Mark Spencer's avatar
    Mark Spencer committed
    {
    	int res;
    	res = ast_unregister_translator(&lintog723);
    
    	res |= ast_unregister_translator(&g723tolin);
    
    Mark Spencer's avatar
    Mark Spencer committed
    	return res;
    }
    
    
    static int load_module(void *mod)
    
    Mark Spencer's avatar
    Mark Spencer committed
    {
    	int res;
    
    	res=ast_register_translator(&g723tolin, mod);
    
    Mark Spencer's avatar
    Mark Spencer committed
    	if (!res) 
    
    		res=ast_register_translator(&lintog723, mod);
    
    Mark Spencer's avatar
    Mark Spencer committed
    	else
    		ast_unregister_translator(&g723tolin);
    	return res;
    }
    
    
    static const char *description(void)
    
    Mark Spencer's avatar
    Mark Spencer committed
    {
    
    #ifdef ANNEX_B
    	return "Annex B (floating point) G.723.1/PCM16 Codec Translator";
    #else
    	return "Annex A (fixed point) G.723.1/PCM16 Codec Translator";
    #endif
    
    
    static const char *key(void)
    
    Mark Spencer's avatar
    Mark Spencer committed
    {
    	return ASTERISK_GPL_KEY;
    }
    
    
    STD_MOD(MOD_1, reload, NULL, NULL);