Version 0.1.10 from FTP
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@392 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Mark Spencer
parent
eac24165f7
commit
a0e2c58919
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@ -0,0 +1,85 @@
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/*
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* Asterisk -- A telephony toolkit for Linux.
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*
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* u-Law to Signed linear conversion
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*
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* Copyright (C) 1999, Mark Spencer
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*
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* Mark Spencer <markster@linux-support.net>
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License
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*/
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#include <asterisk/alaw.h>
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#define AMI_MASK 0x55
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static inline unsigned char linear2alaw (short int linear)
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{
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int mask;
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int seg;
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int pcm_val;
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static int seg_end[8] =
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{
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0xFF, 0x1FF, 0x3FF, 0x7FF, 0xFFF, 0x1FFF, 0x3FFF, 0x7FFF
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};
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pcm_val = linear;
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if (pcm_val >= 0)
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{
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/* Sign (7th) bit = 1 */
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mask = AMI_MASK | 0x80;
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}
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else
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{
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/* Sign bit = 0 */
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mask = AMI_MASK;
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pcm_val = -pcm_val;
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}
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/* Convert the scaled magnitude to segment number. */
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for (seg = 0; seg < 8; seg++)
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{
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if (pcm_val <= seg_end[seg])
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break;
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}
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/* Combine the sign, segment, and quantization bits. */
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return ((seg << 4) | ((pcm_val >> ((seg) ? (seg + 3) : 4)) & 0x0F)) ^ mask;
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}
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/*- End of function --------------------------------------------------------*/
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static inline short int alaw2linear (unsigned char alaw)
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{
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int i;
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int seg;
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alaw ^= AMI_MASK;
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i = ((alaw & 0x0F) << 4);
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seg = (((int) alaw & 0x70) >> 4);
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if (seg)
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i = (i + 0x100) << (seg - 1);
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return (short int) ((alaw & 0x80) ? i : -i);
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}
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unsigned char __ast_lin2a[8192];
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short __ast_alaw[256];
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void ast_alaw_init(void)
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{
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int i;
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/*
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* Set up mu-law conversion table
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*/
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for(i = 0;i < 256;i++)
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{
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__ast_alaw[i] = alaw2linear(i);
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}
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/* set up the reverse (mu-law) conversion table */
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for(i = -32768; i < 32768; i++)
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{
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__ast_lin2a[((unsigned short)i) >> 3] = linear2alaw(i);
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}
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}
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@ -28,7 +28,8 @@ LIBGSM=gsm/lib/libgsm.a
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LIBMP3=mp3/libmp3.a
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LIBLPC10=lpc10/liblpc10.a
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CODECS+=$(MODG723) codec_gsm.so codec_mp3_d.so codec_lpc10.so codec_adpcm.so codec_ulaw.so
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CODECS+=$(MODG723) codec_gsm.so codec_mp3_d.so codec_lpc10.so \
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codec_adpcm.so codec_ulaw.so codec_alaw.so codec_a_mu.so
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all: $(CODECS)
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@ -0,0 +1,378 @@
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/* codec_alaw.c - translate between signed linear and alaw
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*
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* Asterisk -- A telephony toolkit for Linux.
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*
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* Copyright (c) 2001 Linux Support Services, Inc. All rights reserved.
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*
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* Mark Spencer <markster@linux-support.net
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License
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*/
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#include <asterisk/logger.h>
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#include <asterisk/module.h>
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#include <asterisk/translate.h>
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#include <asterisk/channel.h>
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#include <asterisk/alaw.h>
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#include <fcntl.h>
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#include <netinet/in.h>
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#include <pthread.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#define BUFFER_SIZE 8096 /* size for the translation buffers */
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static pthread_mutex_t localuser_lock = PTHREAD_MUTEX_INITIALIZER;
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static int localusecnt = 0;
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static char *tdesc = "A-law Coder/Decoder";
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/* Sample frame data (Mu data is okay) */
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#include "slin_ulaw_ex.h"
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#include "ulaw_slin_ex.h"
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/*
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* Private workspace for translating signed linear signals to alaw.
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*/
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struct alaw_encoder_pvt
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{
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struct ast_frame f;
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char offset[AST_FRIENDLY_OFFSET]; /* Space to build offset */
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unsigned char outbuf[BUFFER_SIZE]; /* Encoded alaw, two nibbles to a word */
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int tail;
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};
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/*
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* Private workspace for translating alaw signals to signed linear.
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*/
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struct alaw_decoder_pvt
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{
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struct ast_frame f;
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char offset[AST_FRIENDLY_OFFSET]; /* Space to build offset */
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short outbuf[BUFFER_SIZE]; /* Decoded signed linear values */
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int tail;
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};
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/*
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* alawToLin_New
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* Create a new instance of alaw_decoder_pvt.
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*
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* Results:
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* Returns a pointer to the new instance.
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*
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* Side effects:
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* None.
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*/
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static struct ast_translator_pvt *
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alawtolin_new ()
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{
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struct alaw_decoder_pvt *tmp;
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tmp = malloc (sizeof (struct alaw_decoder_pvt));
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if (tmp)
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{
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memset(tmp, 0, sizeof(*tmp));
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tmp->tail = 0;
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localusecnt++;
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ast_update_use_count ();
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}
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return (struct ast_translator_pvt *) tmp;
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}
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/*
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* LinToalaw_New
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* Create a new instance of alaw_encoder_pvt.
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*
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* Results:
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* Returns a pointer to the new instance.
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*
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* Side effects:
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* None.
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*/
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static struct ast_translator_pvt *
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lintoalaw_new ()
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{
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struct alaw_encoder_pvt *tmp;
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tmp = malloc (sizeof (struct alaw_encoder_pvt));
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if (tmp)
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{
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memset(tmp, 0, sizeof(*tmp));
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localusecnt++;
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ast_update_use_count ();
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tmp->tail = 0;
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}
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return (struct ast_translator_pvt *) tmp;
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}
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/*
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* alawToLin_FrameIn
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* Fill an input buffer with packed 4-bit alaw values if there is room
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* left.
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*
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* Results:
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* Foo
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*
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* Side effects:
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* tmp->tail is the number of packed values in the buffer.
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*/
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static int
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alawtolin_framein (struct ast_translator_pvt *pvt, struct ast_frame *f)
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{
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struct alaw_decoder_pvt *tmp = (struct alaw_decoder_pvt *) pvt;
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int x;
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unsigned char *b;
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if ((tmp->tail + f->datalen) * 2 > sizeof(tmp->outbuf)) {
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ast_log(LOG_WARNING, "Out of buffer space\n");
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return -1;
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}
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/* Reset ssindex and signal to frame's specified values */
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b = f->data;
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for (x=0;x<f->datalen;x++)
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tmp->outbuf[tmp->tail + x] = AST_ALAW(b[x]);
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tmp->tail += f->datalen;
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return 0;
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}
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/*
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* alawToLin_FrameOut
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* Convert 4-bit alaw encoded signals to 16-bit signed linear.
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*
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* Results:
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* Converted signals are placed in tmp->f.data, tmp->f.datalen
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* and tmp->f.timelen are calculated.
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*
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* Side effects:
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* None.
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*/
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static struct ast_frame *
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alawtolin_frameout (struct ast_translator_pvt *pvt)
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{
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struct alaw_decoder_pvt *tmp = (struct alaw_decoder_pvt *) pvt;
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if (!tmp->tail)
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return NULL;
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tmp->f.frametype = AST_FRAME_VOICE;
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tmp->f.subclass = AST_FORMAT_SLINEAR;
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tmp->f.datalen = tmp->tail *2;
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tmp->f.timelen = tmp->tail / 8;
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tmp->f.mallocd = 0;
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tmp->f.offset = AST_FRIENDLY_OFFSET;
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tmp->f.src = __PRETTY_FUNCTION__;
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tmp->f.data = tmp->outbuf;
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tmp->tail = 0;
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return &tmp->f;
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}
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/*
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* LinToalaw_FrameIn
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* Fill an input buffer with 16-bit signed linear PCM values.
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*
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* Results:
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* None.
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*
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* Side effects:
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* tmp->tail is number of signal values in the input buffer.
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*/
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static int
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lintoalaw_framein (struct ast_translator_pvt *pvt, struct ast_frame *f)
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{
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struct alaw_encoder_pvt *tmp = (struct alaw_encoder_pvt *) pvt;
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int x;
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short *s;
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if (tmp->tail + f->datalen/2 >= sizeof(tmp->outbuf))
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{
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ast_log (LOG_WARNING, "Out of buffer space\n");
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return -1;
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}
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s = f->data;
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for (x=0;x<f->datalen/2;x++)
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tmp->outbuf[x+tmp->tail] = AST_LIN2A(s[x]);
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tmp->tail += f->datalen/2;
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return 0;
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}
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/*
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* LinToalaw_FrameOut
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* Convert a buffer of raw 16-bit signed linear PCM to a buffer
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* of 4-bit alaw packed two to a byte (Big Endian).
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*
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* Results:
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* Foo
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*
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* Side effects:
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* Leftover inbuf data gets packed, tail gets updated.
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*/
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static struct ast_frame *
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lintoalaw_frameout (struct ast_translator_pvt *pvt)
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{
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struct alaw_encoder_pvt *tmp = (struct alaw_encoder_pvt *) pvt;
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if (tmp->tail) {
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tmp->f.frametype = AST_FRAME_VOICE;
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tmp->f.subclass = AST_FORMAT_ALAW;
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tmp->f.timelen = tmp->tail / 8;
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tmp->f.mallocd = 0;
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tmp->f.offset = AST_FRIENDLY_OFFSET;
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tmp->f.src = __PRETTY_FUNCTION__;
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tmp->f.data = tmp->outbuf;
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tmp->f.datalen = tmp->tail;
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tmp->tail = 0;
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return &tmp->f;
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} else return NULL;
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}
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/*
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* alawToLin_Sample
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*/
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static struct ast_frame *
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alawtolin_sample ()
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{
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static struct ast_frame f;
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f.frametype = AST_FRAME_VOICE;
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f.subclass = AST_FORMAT_ALAW;
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f.datalen = sizeof (ulaw_slin_ex);
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f.timelen = sizeof(ulaw_slin_ex) / 8;
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f.mallocd = 0;
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f.offset = 0;
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f.src = __PRETTY_FUNCTION__;
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f.data = ulaw_slin_ex;
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return &f;
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}
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/*
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* LinToalaw_Sample
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*/
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static struct ast_frame *
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lintoalaw_sample ()
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{
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static struct ast_frame f;
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f.frametype = AST_FRAME_VOICE;
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f.subclass = AST_FORMAT_SLINEAR;
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f.datalen = sizeof (slin_ulaw_ex);
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/* Assume 8000 Hz */
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f.timelen = sizeof (slin_ulaw_ex) / 16;
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f.mallocd = 0;
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f.offset = 0;
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f.src = __PRETTY_FUNCTION__;
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f.data = slin_ulaw_ex;
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return &f;
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}
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/*
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* alaw_Destroy
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* Destroys a private workspace.
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*
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* Results:
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* It's gone!
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*
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* Side effects:
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* None.
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*/
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static void
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alaw_destroy (struct ast_translator_pvt *pvt)
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{
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free (pvt);
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localusecnt--;
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ast_update_use_count ();
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}
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/*
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* The complete translator for alawToLin.
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*/
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static struct ast_translator alawtolin = {
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"alawtolin",
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AST_FORMAT_ALAW,
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AST_FORMAT_SLINEAR,
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alawtolin_new,
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alawtolin_framein,
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alawtolin_frameout,
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alaw_destroy,
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/* NULL */
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alawtolin_sample
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};
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/*
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* The complete translator for LinToalaw.
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*/
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static struct ast_translator lintoalaw = {
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"lintoalaw",
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AST_FORMAT_SLINEAR,
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AST_FORMAT_ALAW,
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lintoalaw_new,
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lintoalaw_framein,
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lintoalaw_frameout,
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alaw_destroy,
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/* NULL */
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lintoalaw_sample
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};
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int
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unload_module (void)
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{
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int res;
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ast_pthread_mutex_lock (&localuser_lock);
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res = ast_unregister_translator (&lintoalaw);
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if (!res)
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res = ast_unregister_translator (&alawtolin);
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if (localusecnt)
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res = -1;
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ast_pthread_mutex_unlock (&localuser_lock);
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return res;
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}
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int
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load_module (void)
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{
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int res;
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res = ast_register_translator (&alawtolin);
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if (!res)
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res = ast_register_translator (&lintoalaw);
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else
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ast_unregister_translator (&alawtolin);
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return res;
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}
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/*
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* Return a description of this module.
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*/
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char *
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description (void)
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{
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return tdesc;
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}
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int
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usecount (void)
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{
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int res;
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STANDARD_USECOUNT (res);
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return res;
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}
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char *
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key ()
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{
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return ASTERISK_GPL_KEY;
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}
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|
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@ -0,0 +1,34 @@
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/*
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* Asterisk -- A telephony toolkit for Linux.
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*
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* A-Law to Signed linear conversion
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*
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* Copyright (C) 1999, Mark Spencer
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*
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* Mark Spencer <markster@linux-support.net>
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License
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*/
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#ifndef _ASTERISK_ALAW_H
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#define _ASTERISK_ALAW_H
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//! Init the ulaw conversion stuff
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/*!
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* To init the ulaw to slinear conversion stuff, this needs to be run.
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*/
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extern void ast_alaw_init(void);
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//! converts signed linear to mulaw
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/*!
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*/
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extern unsigned char __ast_lin2a[8192];
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//! help
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extern short __ast_alaw[256];
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#define AST_LIN2A(a) (__ast_lin2a[((unsigned short)(a)) >> 3])
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#define AST_ALAW(a) (__ast_alaw[(a)])
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#endif
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