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146 lines
3.5 KiB
146 lines
3.5 KiB
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 2005, Anthony Minessale II.
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*
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* Anthony Minessale <anthmct@yahoo.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 A machine to gather up arbitrary frames and convert them
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* to raw slinear on demand.
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*
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* \author Anthony Minessale <anthmct@yahoo.com>
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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 <string.h>
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#include "asterisk/frame.h"
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#include "asterisk/slinfactory.h"
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#include "asterisk/logger.h"
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#include "asterisk/translate.h"
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void ast_slinfactory_init(struct ast_slinfactory *sf)
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{
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memset(sf, 0, sizeof(*sf));
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sf->offset = sf->hold;
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}
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void ast_slinfactory_destroy(struct ast_slinfactory *sf)
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{
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struct ast_frame *f;
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if (sf->trans) {
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ast_translator_free_path(sf->trans);
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sf->trans = NULL;
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}
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while ((f = AST_LIST_REMOVE_HEAD(&sf->queue, frame_list)))
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ast_frfree(f);
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}
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int ast_slinfactory_feed(struct ast_slinfactory *sf, struct ast_frame *f)
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{
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struct ast_frame *frame, *frame_ptr;
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unsigned int x;
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if (f->subclass != AST_FORMAT_SLINEAR) {
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if (sf->trans && f->subclass != sf->format) {
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ast_translator_free_path(sf->trans);
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sf->trans = NULL;
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}
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if (!sf->trans) {
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if ((sf->trans = ast_translator_build_path(AST_FORMAT_SLINEAR, f->subclass)) == NULL) {
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ast_log(LOG_WARNING, "Cannot build a path from %s to slin\n", ast_getformatname(f->subclass));
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return 0;
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} else {
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sf->format = f->subclass;
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}
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}
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}
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if (!(frame = ast_frdup( (sf->trans) ? ast_translate(sf->trans, f, 0) : f )))
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return 0;
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x = 0;
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AST_LIST_TRAVERSE(&sf->queue, frame_ptr, frame_list)
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x++;
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AST_LIST_INSERT_TAIL(&sf->queue, frame, frame_list);
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sf->size += frame->samples;
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return x;
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}
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int ast_slinfactory_read(struct ast_slinfactory *sf, short *buf, size_t samples)
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{
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struct ast_frame *frame_ptr;
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unsigned int sofar = 0, ineed, remain;
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short *frame_data, *offset = buf;
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while (sofar < samples) {
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ineed = samples - sofar;
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if (sf->holdlen) {
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if ((sofar + sf->holdlen) <= ineed) {
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memcpy(offset, sf->hold, sf->holdlen * sizeof(*offset));
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sofar += sf->holdlen;
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offset += sf->holdlen;
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sf->holdlen = 0;
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sf->offset = sf->hold;
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} else {
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remain = sf->holdlen - ineed;
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memcpy(offset, sf->offset, ineed * sizeof(*offset));
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sofar += ineed;
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sf->offset += ineed;
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sf->holdlen = remain;
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}
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continue;
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}
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if ((frame_ptr = AST_LIST_REMOVE_HEAD(&sf->queue, frame_list))) {
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frame_data = frame_ptr->data;
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if ((sofar + frame_ptr->samples) <= ineed) {
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memcpy(offset, frame_data, frame_ptr->samples * sizeof(*offset));
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sofar += frame_ptr->samples;
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offset += frame_ptr->samples;
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} else {
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remain = frame_ptr->samples - ineed;
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memcpy(offset, frame_data, ineed * sizeof(*offset));
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sofar += ineed;
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frame_data += ineed;
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memcpy(sf->hold, frame_data, remain * sizeof(*offset));
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sf->holdlen = remain;
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}
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ast_frfree(frame_ptr);
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} else {
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break;
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}
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}
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sf->size -= sofar;
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return sofar;
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}
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unsigned int ast_slinfactory_available(const struct ast_slinfactory *sf)
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{
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return sf->size;
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}
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