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Diffstat (limited to 'trunk/main/slinfactory.c')
| -rw-r--r-- | trunk/main/slinfactory.c | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/trunk/main/slinfactory.c b/trunk/main/slinfactory.c new file mode 100644 index 000000000..25d232a37 --- /dev/null +++ b/trunk/main/slinfactory.c @@ -0,0 +1,165 @@ +/* + * 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" + +void ast_slinfactory_init(struct ast_slinfactory *sf) +{ + memset(sf, 0, sizeof(*sf)); + sf->offset = sf->hold; +} + +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); +} + +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) { + 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(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)) || !(duped_frame = ast_frdup(begin_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; +} + +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 ((sofar + 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; + + if ((sofar + 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; + memcpy(sf->hold, frame_data, remain * sizeof(*offset)); + sf->holdlen = remain; + } + ast_frfree(frame_ptr); + } else { + break; + } + } + + sf->size -= sofar; + return sofar; +} + +unsigned int ast_slinfactory_available(const struct ast_slinfactory *sf) +{ + return sf->size; +} + +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; +} |