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/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 2005, Anthony Minessale II.
*
* Anthony Minessale <anthmct@yahoo.com>
*
* 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 A machine to gather up arbitrary frames and convert them
* to raw slinear on demand.
*
* \author Anthony Minessale <anthmct@yahoo.com>
*/
#include "asterisk.h"
ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
#include "asterisk/frame.h"
#include "asterisk/slinfactory.h"
#include "asterisk/translate.h"
/*!
* \brief Initialize an slinfactory
*
* \arg sf The slinfactory to initialize
*
* \return Nothing
*/
void ast_slinfactory_init(struct ast_slinfactory *sf)
{
memset(sf, 0, sizeof(*sf));
sf->offset = sf->hold;
}
/*!
* \brief Destroy the contents of a slinfactory
*
* \arg sf The slinfactory that is no longer needed
*
* This function will free any memory allocated for the contents of the
* slinfactory. It does not free the slinfactory itself. If the sf is
* malloc'd, then it must be explicitly free'd after calling this function.
*
* \return Nothing
*/
void ast_slinfactory_destroy(struct ast_slinfactory *sf)
{
struct ast_frame *f;
if (sf->trans) {
ast_translator_free_path(sf->trans);
sf->trans = NULL;
}
while ((f = AST_LIST_REMOVE_HEAD(&sf->queue, frame_list)))
ast_frfree(f);
}
/*!
* \brief Feed audio into an slinfactory
*
* \arg sf The slinfactory to feed into
* \arg f Frame containing audio to feed in
*
* \return Number of frames currently in factory
*/
int ast_slinfactory_feed(struct ast_slinfactory *sf, struct ast_frame *f)
{
struct ast_frame *begin_frame = f, *duped_frame = NULL, *frame_ptr;
unsigned int x;
if (f->subclass != AST_FORMAT_SLINEAR && f->subclass != AST_FORMAT_SLINEAR16) {
if (sf->trans && f->subclass != sf->format) {
ast_translator_free_path(sf->trans);
sf->trans = NULL;
}
if (!sf->trans) {
if (!(sf->trans = ast_translator_build_path((f->subclass == AST_FORMAT_G722 ? AST_FORMAT_SLINEAR16 : AST_FORMAT_SLINEAR), f->subclass))) {
ast_log(LOG_WARNING, "Cannot build a path from %s to slin\n", ast_getformatname(f->subclass));
return 0;
}
sf->format = f->subclass;
}
if (!(begin_frame = ast_translate(sf->trans, f, 0)))
return 0;
duped_frame = ast_frdup(begin_frame);
ast_frfree(begin_frame);
if (!duped_frame)
return 0;
} else {
if (sf->trans) {
ast_translator_free_path(sf->trans);
sf->trans = NULL;
}
if (!(duped_frame = ast_frdup(f)))
return 0;
}
x = 0;
AST_LIST_TRAVERSE(&sf->queue, frame_ptr, frame_list)
x++;
AST_LIST_INSERT_TAIL(&sf->queue, duped_frame, frame_list);
sf->size += duped_frame->samples;
return x;
}
/*!
* \brief Read samples from an slinfactory
*
* \arg sf The slinfactory to read from
* \arg buf Buffer to put samples into
* \arg samples Number of samples wanted
*
* \return Number of samples read
*/
int ast_slinfactory_read(struct ast_slinfactory *sf, short *buf, size_t samples)
{
struct ast_frame *frame_ptr;
unsigned int sofar = 0, ineed, remain;
short *frame_data, *offset = buf;
while (sofar < samples) {
ineed = samples - sofar;
if (sf->holdlen) {
if (sf->holdlen <= ineed) {
memcpy(offset, sf->hold, sf->holdlen * sizeof(*offset));
sofar += sf->holdlen;
offset += sf->holdlen;
sf->holdlen = 0;
sf->offset = sf->hold;
} else {
remain = sf->holdlen - ineed;
memcpy(offset, sf->offset, ineed * sizeof(*offset));
sofar += ineed;
sf->offset += ineed;
sf->holdlen = remain;
}
continue;
}
if ((frame_ptr = AST_LIST_REMOVE_HEAD(&sf->queue, frame_list))) {
frame_data = frame_ptr->data.ptr;
if (frame_ptr->samples <= ineed) {
memcpy(offset, frame_data, frame_ptr->samples * sizeof(*offset));
sofar += frame_ptr->samples;
offset += frame_ptr->samples;
} else {
remain = frame_ptr->samples - ineed;
memcpy(offset, frame_data, ineed * sizeof(*offset));
sofar += ineed;
frame_data += ineed;
if (remain > (AST_SLINFACTORY_MAX_HOLD - sf->holdlen)) {
remain = AST_SLINFACTORY_MAX_HOLD - sf->holdlen;
}
memcpy(sf->hold, frame_data, remain * sizeof(*offset));
sf->holdlen = remain;
}
ast_frfree(frame_ptr);
} else {
break;
}
}
sf->size -= sofar;
return sofar;
}
/*!
* \brief Retrieve number of samples currently in an slinfactory
*
* \arg sf The slinfactory to peek into
*
* \return Number of samples in slinfactory
*/
unsigned int ast_slinfactory_available(const struct ast_slinfactory *sf)
{
return sf->size;
}
/*!
* \brief Flush the contents of an slinfactory
*
* \arg sf The slinfactory to flush
*
* \return Nothing
*/
void ast_slinfactory_flush(struct ast_slinfactory *sf)
{
struct ast_frame *fr = NULL;
if (sf->trans) {
ast_translator_free_path(sf->trans);
sf->trans = NULL;
}
while ((fr = AST_LIST_REMOVE_HEAD(&sf->queue, frame_list)))
ast_frfree(fr);
sf->size = sf->holdlen = 0;
sf->offset = sf->hold;
return;
}
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