https://origsvn.digium.com/svn/asterisk/branches/1.4 ........ r65877 | qwell | 2007-05-24 11:14:02 -0400 (Thu, 24 May 2007) | 4 lines Fix handling of zero-length frames when a codec is capable of native PLC. Issue 9183, patch by Mihai. ........ git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@65903 65c4cc65-6c06-0410-ace0-fbb531ad65f3
245 lines
6.2 KiB
C
245 lines
6.2 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* The iLBC code is from The IETF code base and is copyright The Internet Society (2004)
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*
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* Copyright (C) 1999 - 2005, Digium, Inc.
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*
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* Mark Spencer <markster@digium.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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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 Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*! \file
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*
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* \brief Translate between signed linear and Internet Low Bitrate Codec
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*
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* \ingroup codecs
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*/
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#include "asterisk.h"
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ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
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#include <fcntl.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <netinet/in.h>
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#include <string.h>
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#include <stdio.h>
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#include "asterisk/lock.h"
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#include "asterisk/translate.h"
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#include "asterisk/module.h"
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#include "asterisk/logger.h"
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#include "asterisk/channel.h"
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#include "asterisk/utils.h"
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#include "ilbc/iLBC_encode.h"
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#include "ilbc/iLBC_decode.h"
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/* Sample frame data */
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#include "slin_ilbc_ex.h"
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#include "ilbc_slin_ex.h"
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#define USE_ILBC_ENHANCER 0
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#define ILBC_MS 30
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/* #define ILBC_MS 20 */
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#define ILBC_FRAME_LEN 50 /* apparently... */
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#define ILBC_SAMPLES 240 /* 30ms at 8000 hz */
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#define BUFFER_SAMPLES 8000
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struct ilbc_coder_pvt {
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iLBC_Enc_Inst_t enc;
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iLBC_Dec_Inst_t dec;
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/* Enough to store a full second */
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int16_t buf[BUFFER_SAMPLES];
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};
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static int lintoilbc_new(struct ast_trans_pvt *pvt)
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{
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struct ilbc_coder_pvt *tmp = pvt->pvt;
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initEncode(&tmp->enc, ILBC_MS);
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return 0;
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}
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static int ilbctolin_new(struct ast_trans_pvt *pvt)
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{
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struct ilbc_coder_pvt *tmp = pvt->pvt;
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initDecode(&tmp->dec, ILBC_MS, USE_ILBC_ENHANCER);
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return 0;
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}
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static struct ast_frame *lintoilbc_sample(void)
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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_ilbc_ex);
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f.samples = sizeof(slin_ilbc_ex)/2;
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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_ilbc_ex;
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return &f;
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}
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static struct ast_frame *ilbctolin_sample(void)
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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_ILBC;
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f.datalen = sizeof(ilbc_slin_ex);
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/* All frames are 30 ms long */
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f.samples = ILBC_SAMPLES;
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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 = ilbc_slin_ex;
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return &f;
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}
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/*! \brief decode a frame and store in outbuf */
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static int ilbctolin_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
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{
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struct ilbc_coder_pvt *tmp = pvt->pvt;
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int plc_mode = 1; /* 1 = normal data, 0 = plc */
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/* Assuming there's space left, decode into the current buffer at
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the tail location. Read in as many frames as there are */
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int x,i;
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int16_t *dst = (int16_t *)pvt->outbuf;
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float tmpf[ILBC_SAMPLES];
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if (f->datalen == 0) { /* native PLC, set fake f->datalen and clear plc_mode */
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f->datalen = ILBC_FRAME_LEN;
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f->samples = ILBC_SAMPLES;
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plc_mode = 0; /* do native plc */
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pvt->samples += ILBC_SAMPLES;
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}
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if (f->datalen % ILBC_FRAME_LEN) {
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ast_log(LOG_WARNING, "Huh? An ilbc frame that isn't a multiple of 50 bytes long from %s (%d)?\n", f->src, f->datalen);
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return -1;
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}
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for (x=0; x < f->datalen ; x += ILBC_FRAME_LEN) {
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if (pvt->samples + ILBC_SAMPLES > BUFFER_SAMPLES) {
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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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iLBC_decode(tmpf, plc_mode ? f->data + x : NULL, &tmp->dec, plc_mode);
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for ( i=0; i < ILBC_SAMPLES; i++)
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dst[pvt->samples + i] = tmpf[i];
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pvt->samples += ILBC_SAMPLES;
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pvt->datalen += 2*ILBC_SAMPLES;
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}
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return 0;
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}
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/*! \brief store a frame into a temporary buffer, for later decoding */
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static int lintoilbc_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
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{
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struct ilbc_coder_pvt *tmp = pvt->pvt;
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/* Just add the frames to our stream */
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/* XXX We should look at how old the rest of our stream is, and if it
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is too old, then we should overwrite it entirely, otherwise we can
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get artifacts of earlier talk that do not belong */
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memcpy(tmp->buf + pvt->samples, f->data, f->datalen);
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pvt->samples += f->samples;
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return 0;
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}
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/*! \brief encode the temporary buffer and generate a frame */
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static struct ast_frame *lintoilbc_frameout(struct ast_trans_pvt *pvt)
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{
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struct ilbc_coder_pvt *tmp = pvt->pvt;
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int datalen = 0;
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int samples = 0;
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/* We can't work on anything less than a frame in size */
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if (pvt->samples < ILBC_SAMPLES)
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return NULL;
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while (pvt->samples >= ILBC_SAMPLES) {
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float tmpf[ILBC_SAMPLES];
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int i;
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/* Encode a frame of data */
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for (i = 0 ; i < ILBC_SAMPLES ; i++)
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tmpf[i] = tmp->buf[samples + i];
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iLBC_encode((unsigned char *) pvt->outbuf + datalen, tmpf, &tmp->enc);
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datalen += ILBC_FRAME_LEN;
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samples += ILBC_SAMPLES;
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pvt->samples -= ILBC_SAMPLES;
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}
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/* Move the data at the end of the buffer to the front */
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if (pvt->samples)
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memmove(tmp->buf, tmp->buf + samples, pvt->samples * 2);
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return ast_trans_frameout(pvt, datalen, samples);
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}
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static struct ast_translator ilbctolin = {
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.name = "ilbctolin",
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.srcfmt = AST_FORMAT_ILBC,
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.dstfmt = AST_FORMAT_SLINEAR,
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.newpvt = ilbctolin_new,
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.framein = ilbctolin_framein,
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.sample = ilbctolin_sample,
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.desc_size = sizeof(struct ilbc_coder_pvt),
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.buf_size = BUFFER_SAMPLES * 2,
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.native_plc = 1,
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};
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static struct ast_translator lintoilbc = {
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.name = "lintoilbc",
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.srcfmt = AST_FORMAT_SLINEAR,
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.dstfmt = AST_FORMAT_ILBC,
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.newpvt = lintoilbc_new,
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.framein = lintoilbc_framein,
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.frameout = lintoilbc_frameout,
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.sample = lintoilbc_sample,
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.desc_size = sizeof(struct ilbc_coder_pvt),
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.buf_size = (BUFFER_SAMPLES * ILBC_FRAME_LEN + ILBC_SAMPLES - 1) / ILBC_SAMPLES,
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};
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static int unload_module(void)
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{
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int res;
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res = ast_unregister_translator(&lintoilbc);
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res |= ast_unregister_translator(&ilbctolin);
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return res;
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}
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static int load_module(void)
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{
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int res;
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res = ast_register_translator(&ilbctolin);
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if (!res)
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res=ast_register_translator(&lintoilbc);
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else
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ast_unregister_translator(&ilbctolin);
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return res;
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}
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AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "iLBC Coder/Decoder");
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