mirror of https://github.com/asterisk/asterisk
into format_pcm.c git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@17331 65c4cc65-6c06-0410-ace0-fbb531ad65f31.4
Luigi Rizzo
19 years ago
parent
6aa460f81d
commit
66adefc789
@ -1,314 +0,0 @@
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/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 2005, Andriy Pylypenko
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* Code based on format_wav.c by Mark Spencer
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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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/*!
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* \file
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*
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* \brief Work with Sun Microsystems AU format.
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*
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* signed linear
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* \arg File extension: au
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* \ingroup formats
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*/
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#include <stdlib.h>
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#include <sys/time.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include "asterisk.h"
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ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
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#include "asterisk/lock.h"
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#include "asterisk/channel.h"
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#include "asterisk/file.h"
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#include "asterisk/logger.h"
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#include "asterisk/sched.h"
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#include "asterisk/module.h"
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#include "asterisk/endian.h"
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#define BUF_SIZE 160 /* samples and 1 byte per sample */
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#define AU_HEADER_SIZE 24
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#define AU_HEADER(var) u_int32_t var[6]
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#define AU_HDR_MAGIC_OFF 0
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#define AU_HDR_HDR_SIZE_OFF 1
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#define AU_HDR_DATA_SIZE_OFF 2
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#define AU_HDR_ENCODING_OFF 3
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#define AU_HDR_SAMPLE_RATE_OFF 4
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#define AU_HDR_CHANNELS_OFF 5
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#define AU_ENC_8BIT_ULAW 1
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#define AU_MAGIC 0x2e736e64
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#if __BYTE_ORDER == __BIG_ENDIAN
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#define htoll(b) (b)
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#define htols(b) (b)
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#define ltohl(b) (b)
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#define ltohs(b) (b)
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#else
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#if __BYTE_ORDER == __LITTLE_ENDIAN
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#define htoll(b) \
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(((((b) ) & 0xFF) << 24) | \
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((((b) >> 8) & 0xFF) << 16) | \
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((((b) >> 16) & 0xFF) << 8) | \
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((((b) >> 24) & 0xFF) ))
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#define htols(b) \
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(((((b) ) & 0xFF) << 8) | \
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((((b) >> 8) & 0xFF) ))
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#define ltohl(b) htoll(b)
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#define ltohs(b) htols(b)
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#else
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#error "Endianess not defined"
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#endif
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#endif
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static int check_header(FILE *f)
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{
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AU_HEADER(header);
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u_int32_t magic;
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u_int32_t hdr_size;
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off_t data_size;
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u_int32_t encoding;
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u_int32_t sample_rate;
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u_int32_t channels;
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if (fread(header, 1, AU_HEADER_SIZE, f) != AU_HEADER_SIZE) {
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ast_log(LOG_WARNING, "Read failed (header)\n");
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return -1;
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}
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magic = ltohl(header[AU_HDR_MAGIC_OFF]);
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if (magic != (u_int32_t) AU_MAGIC) {
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ast_log(LOG_WARNING, "Bad magic: 0x%x\n", magic);
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}
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/* hdr_size = ltohl(header[AU_HDR_HDR_SIZE_OFF]);
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if (hdr_size < AU_HEADER_SIZE)*/
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hdr_size = AU_HEADER_SIZE;
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/* data_size = ltohl(header[AU_HDR_DATA_SIZE_OFF]); */
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encoding = ltohl(header[AU_HDR_ENCODING_OFF]);
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if (encoding != AU_ENC_8BIT_ULAW) {
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ast_log(LOG_WARNING, "Unexpected format: %d. Only 8bit ULAW allowed (%d)\n", encoding, AU_ENC_8BIT_ULAW);
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return -1;
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}
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sample_rate = ltohl(header[AU_HDR_SAMPLE_RATE_OFF]);
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if (sample_rate != DEFAULT_SAMPLE_RATE) {
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ast_log(LOG_WARNING, "Sample rate can only be 8000 not %d\n", sample_rate);
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return -1;
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}
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channels = ltohl(header[AU_HDR_CHANNELS_OFF]);
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if (channels != 1) {
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ast_log(LOG_WARNING, "Not in mono: channels=%d\n", channels);
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return -1;
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}
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/* Skip to data */
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fseek(f, 0, SEEK_END);
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data_size = ftello(f) - hdr_size;
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if (fseek(f, hdr_size, SEEK_SET) == -1 ) {
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ast_log(LOG_WARNING, "Failed to skip to data: %d\n", hdr_size);
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return -1;
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}
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return data_size;
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}
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static int update_header(FILE *f)
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{
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off_t cur, end;
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u_int32_t datalen;
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int bytes;
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cur = ftello(f);
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fseek(f, 0, SEEK_END);
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end = ftello(f);
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/* data starts 24 bytes in */
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bytes = end - AU_HEADER_SIZE;
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datalen = htoll(bytes);
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if (cur < 0) {
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ast_log(LOG_WARNING, "Unable to find our position\n");
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return -1;
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}
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if (fseek(f, AU_HDR_DATA_SIZE_OFF * sizeof(u_int32_t), SEEK_SET)) {
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ast_log(LOG_WARNING, "Unable to set our position\n");
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return -1;
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}
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if (fwrite(&datalen, 1, sizeof(datalen), f) != sizeof(datalen)) {
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ast_log(LOG_WARNING, "Unable to set write file size\n");
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return -1;
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}
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if (fseek(f, cur, SEEK_SET)) {
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ast_log(LOG_WARNING, "Unable to return to position\n");
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return -1;
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}
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return 0;
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}
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static int write_header(FILE *f)
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{
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AU_HEADER(header);
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header[AU_HDR_MAGIC_OFF] = htoll((u_int32_t) AU_MAGIC);
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header[AU_HDR_HDR_SIZE_OFF] = htoll(AU_HEADER_SIZE);
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header[AU_HDR_DATA_SIZE_OFF] = 0;
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header[AU_HDR_ENCODING_OFF] = htoll(AU_ENC_8BIT_ULAW);
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header[AU_HDR_SAMPLE_RATE_OFF] = htoll(DEFAULT_SAMPLE_RATE);
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header[AU_HDR_CHANNELS_OFF] = htoll(1);
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/* Write an au header, ignoring sizes which will be filled in later */
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fseek(f, 0, SEEK_SET);
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if (fwrite(header, 1, AU_HEADER_SIZE, f) != AU_HEADER_SIZE) {
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ast_log(LOG_WARNING, "Unable to write header\n");
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return -1;
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}
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return 0;
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}
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static int au_open(struct ast_filestream *s)
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{
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if (check_header(s->f) < 0)
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return -1;
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return 0;
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}
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static int au_rewrite(struct ast_filestream *s, const char *comment)
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{
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if (write_header(s->f))
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return -1;
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return 0;
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}
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static struct ast_frame *au_read(struct ast_filestream *s, int *whennext)
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{
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int res;
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/* Send a frame from the file to the appropriate channel */
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s->fr.frametype = AST_FRAME_VOICE;
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s->fr.subclass = AST_FORMAT_ULAW;
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s->fr.mallocd = 0;
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FR_SET_BUF(&s->fr, s->buf, AST_FRIENDLY_OFFSET, BUF_SIZE);
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if ((res = fread(s->fr.data, 1, s->fr.datalen, s->f)) < 1) {
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if (res)
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ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
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return NULL;
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}
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*whennext = s->fr.samples = res;
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s->fr.datalen = res;
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return &s->fr;
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}
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static int au_write(struct ast_filestream *fs, struct ast_frame *f)
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{
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int res;
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if (f->frametype != AST_FRAME_VOICE) {
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ast_log(LOG_WARNING, "Asked to write non-voice frame!\n");
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return -1;
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}
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if (f->subclass != AST_FORMAT_ULAW) {
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ast_log(LOG_WARNING, "Asked to write non-ulaw frame (%d)!\n", f->subclass);
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return -1;
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}
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if ((res = fwrite(f->data, 1, f->datalen, fs->f)) != f->datalen) {
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ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n", res, f->datalen, strerror(errno));
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return -1;
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}
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update_header(fs->f);
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return 0;
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}
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static int au_seek(struct ast_filestream *fs, off_t sample_offset, int whence)
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{
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off_t min, max, cur;
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unsigned long offset = 0, samples;
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samples = sample_offset;
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min = AU_HEADER_SIZE;
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cur = ftello(fs->f);
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fseek(fs->f, 0, SEEK_END);
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max = ftello(fs->f);
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if (whence == SEEK_SET)
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offset = samples + min;
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else if (whence == SEEK_CUR || whence == SEEK_FORCECUR)
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offset = samples + cur;
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else if (whence == SEEK_END)
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offset = max - samples;
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if (whence != SEEK_FORCECUR) {
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offset = (offset > max) ? max : offset;
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}
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/* always protect the header space. */
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offset = (offset < min) ? min : offset;
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return fseek(fs->f, offset, SEEK_SET);
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}
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static int au_trunc(struct ast_filestream *fs)
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{
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if (ftruncate(fileno(fs->f), ftello(fs->f)))
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return -1;
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return update_header(fs->f);
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}
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static off_t au_tell(struct ast_filestream *fs)
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{
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off_t offset = ftello(fs->f);
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return offset - AU_HEADER_SIZE;
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}
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static struct ast_format_lock me = { .usecnt = -1 };
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static const struct ast_format au_f = {
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.name = "au",
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.exts = "au",
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.format = AST_FORMAT_ULAW,
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.open = au_open,
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.rewrite = au_rewrite,
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.write = au_write,
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.seek = au_seek,
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.trunc = au_trunc,
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.tell = au_tell,
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.read = au_read,
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.buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET, /* this many shorts */
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.lockp = &me,
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};
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int load_module()
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{
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return ast_format_register(&au_f);
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}
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int unload_module()
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{
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return ast_format_unregister(au_f.name);
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}
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int usecount()
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{
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return me.usecnt;
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}
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char *description()
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{
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return "Sun Microsystems AU format (signed linear)";
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}
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char *key()
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{
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return ASTERISK_GPL_KEY;
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}
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@ -1,291 +0,0 @@
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/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 1999 - 2006, 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 Flat, binary, alaw PCM file format.
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* \arg File name extensions: alaw, al
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* \ingroup formats
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*/
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#include <unistd.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <stdlib.h>
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#include <sys/time.h>
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#include <sys/times.h>
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#include <sys/types.h>
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#include <stdio.h>
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#include <errno.h>
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#include <string.h>
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#include "asterisk.h"
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ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
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#include "asterisk/lock.h"
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#include "asterisk/channel.h"
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#include "asterisk/file.h"
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#include "asterisk/logger.h"
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#include "asterisk/sched.h"
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#include "asterisk/module.h"
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#include "asterisk/endian.h"
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#include "asterisk/alaw.h"
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#define BUF_SIZE 160 /* 160 bytes, and same number of samples */
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/* #define REALTIME_WRITE */ /* XXX does it work at all ? */
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struct pcma_desc {
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#ifdef REALTIME_WRITE
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unsigned long start_time;
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#endif
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};
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static char alaw_silence[BUF_SIZE];
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#if 0
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/* Returns time in msec since system boot. */
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static unsigned long get_time(struct ast_filestream *s)
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{
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struct tms buf;
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clock_t cur;
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unsigned long *res;
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cur = times( &buf );
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if( cur < 0 )
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{
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ast_log( LOG_WARNING, "Cannot get current time\n" );
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return 0;
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}
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res = cur * 1000 / sysconf( _SC_CLK_TCK );
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if (s) {
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struct pcma_desc *d = (struct pcma_filestream *)s->private;
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d->start_time = res;
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}
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return res;
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}
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#endif
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static int pcm_open(struct ast_filestream *s)
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{
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#ifdef REALTIME_WRITE
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get_time(s);
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#endif
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return 0;
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}
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static int pcm_rewrite(struct ast_filestream *s, const char *comment)
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{
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return pcm_open(s);
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}
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static struct ast_frame *pcm_read(struct ast_filestream *s, int *whennext)
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{
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int res;
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/* Send a frame from the file to the appropriate channel */
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s->fr.frametype = AST_FRAME_VOICE;
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s->fr.subclass = AST_FORMAT_ALAW;
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s->fr.mallocd = 0;
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FR_SET_BUF(&s->fr, s->buf, AST_FRIENDLY_OFFSET, BUF_SIZE);
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if ((res = fread(s->fr.data, 1, s->fr.datalen, s->f)) < 1) {
|
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if (res)
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ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
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return NULL;
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||||
}
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s->fr.datalen = res;
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*whennext = s->fr.samples = res;
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return &s->fr;
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}
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static int pcm_write(struct ast_filestream *fs, struct ast_frame *f)
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||||
{
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int res;
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#ifdef REALTIME_WRITE
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unsigned long cur_time;
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unsigned long fpos;
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struct stat stat_buf;
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struct pcma_filestream *s = (struct pcma_filestream *)fs->private;
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#endif
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if (f->frametype != AST_FRAME_VOICE) {
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ast_log(LOG_WARNING, "Asked to write non-voice frame!\n");
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return -1;
|
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}
|
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if (f->subclass != AST_FORMAT_ALAW) {
|
||||
ast_log(LOG_WARNING, "Asked to write non-alaw frame (%d)!\n", f->subclass);
|
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return -1;
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||||
}
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||||
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||||
#ifdef REALTIME_WRITE
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cur_time = get_time();
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fpos = ( cur_time - s->start_time ) * 8; /* 8 bytes per msec */
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/* Check if we have written to this position yet. If we have, then increment pos by one frame
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||||
* for some degree of protection against receiving packets in the same clock tick.
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||||
*/
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||||
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fstat(fileno(fs->f), &stat_buf );
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||||
if (stat_buf.st_size > fpos ) {
|
||||
fpos += f->datalen; /* Incrementing with the size of this current frame */
|
||||
}
|
||||
|
||||
if (stat_buf.st_size < fpos) {
|
||||
/* fill the gap with 0x55 rather than 0. */
|
||||
char buf[ 512 ];
|
||||
unsigned long cur, to_write;
|
||||
|
||||
cur = stat_buf.st_size;
|
||||
if (fseeko(fs->f, cur, SEEK_SET) < 0) {
|
||||
ast_log( LOG_WARNING, "Cannot seek in file: %s\n", strerror(errno) );
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||||
return -1;
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||||
}
|
||||
memset(buf, 0x55, 512);
|
||||
while (cur < fpos) {
|
||||
to_write = fpos - cur;
|
||||
if (to_write > 512) {
|
||||
to_write = 512;
|
||||
}
|
||||
fwrite(buf, 1, to_write, fs->f);
|
||||
cur += to_write;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
if (fseeko(s->f, fpos, SEEK_SET) < 0) {
|
||||
ast_log( LOG_WARNING, "Cannot seek in file: %s\n", strerror(errno) );
|
||||
return -1;
|
||||
}
|
||||
#endif /* REALTIME_WRITE */
|
||||
|
||||
if ((res = fwrite(f->data, 1, f->datalen, fs->f)) != f->datalen) {
|
||||
ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n", res, f->datalen, strerror(errno));
|
||||
return -1;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int pcm_seek(struct ast_filestream *fs, off_t sample_offset, int whence)
|
||||
{
|
||||
off_t cur, max, offset = 0;
|
||||
int ret = -1; /* assume error */
|
||||
|
||||
cur = ftello(fs->f);
|
||||
fseeko(fs->f, 0, SEEK_END);
|
||||
max = ftello(fs->f);
|
||||
|
||||
switch (whence) {
|
||||
case SEEK_SET:
|
||||
offset = sample_offset;
|
||||
break;
|
||||
case SEEK_END:
|
||||
offset = max - sample_offset;
|
||||
break;
|
||||
case SEEK_CUR:
|
||||
case SEEK_FORCECUR:
|
||||
offset = cur + sample_offset;
|
||||
break;
|
||||
default:
|
||||
ast_log(LOG_WARNING, "invalid whence %d, assuming SEEK_SET\n", whence);
|
||||
offset = sample_offset;
|
||||
}
|
||||
|
||||
if (offset < 0) {
|
||||
offset = 0;
|
||||
ast_log(LOG_WARNING, "negative offset %ld, resetting to 0\n", (long) offset);
|
||||
}
|
||||
if (whence == SEEK_FORCECUR && offset > max) {
|
||||
size_t left = offset - max;
|
||||
|
||||
while (left) {
|
||||
size_t written = fwrite(alaw_silence, sizeof(alaw_silence[0]),
|
||||
(left > BUF_SIZE) ? BUF_SIZE : left, fs->f);
|
||||
if (written == -1)
|
||||
break; /* error */
|
||||
left -= written * sizeof(alaw_silence[0]);
|
||||
}
|
||||
ret = 0; /* success */
|
||||
} else {
|
||||
if (offset > max) {
|
||||
ast_log(LOG_WARNING, "offset too large %ld, truncating to %ld\n", (long) offset, (long) max);
|
||||
offset = max;
|
||||
}
|
||||
ret = fseeko(fs->f, offset, SEEK_SET);
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int pcm_trunc(struct ast_filestream *fs)
|
||||
{
|
||||
return ftruncate(fileno(fs->f), ftello(fs->f));
|
||||
}
|
||||
|
||||
static off_t pcm_tell(struct ast_filestream *fs)
|
||||
{
|
||||
return ftello(fs->f);
|
||||
}
|
||||
|
||||
static struct ast_format_lock me = { .usecnt = -1 };
|
||||
|
||||
static const struct ast_format alaw_f = {
|
||||
.name = "alaw",
|
||||
.exts = "alaw|al",
|
||||
.format = AST_FORMAT_ALAW,
|
||||
.open = pcm_open,
|
||||
.rewrite = pcm_rewrite,
|
||||
.write = pcm_write,
|
||||
.seek = pcm_seek,
|
||||
.trunc = pcm_trunc,
|
||||
.tell = pcm_tell,
|
||||
.read = pcm_read,
|
||||
.buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET,
|
||||
.lockp = &me,
|
||||
#ifdef REALTIME_WRITE
|
||||
.desc_size = sizeof(struct pcma_desc),
|
||||
#endif
|
||||
};
|
||||
|
||||
int load_module()
|
||||
{
|
||||
int index;
|
||||
|
||||
for (index = 0; index < (sizeof(alaw_silence) / sizeof(alaw_silence[0])); index++)
|
||||
alaw_silence[index] = AST_LIN2A(0);
|
||||
|
||||
return ast_format_register(&alaw_f);
|
||||
}
|
||||
|
||||
int unload_module()
|
||||
{
|
||||
return ast_format_unregister(alaw_f.name);
|
||||
}
|
||||
|
||||
int usecount()
|
||||
{
|
||||
return me.usecnt;
|
||||
}
|
||||
|
||||
char *description()
|
||||
{
|
||||
return "Raw aLaw 8khz PCM Audio support";
|
||||
}
|
||||
|
||||
char *key()
|
||||
{
|
||||
return ASTERISK_GPL_KEY;
|
||||
}
|
||||
Loading…
Reference in new issue