Some formats are able to handle short reads while others are not, so restore the previous behavior for the format modules so that we don't have spurious errors when playing back files. ASTERISK-27232 #close Reported by: Jens T. Change-Id: Iab7f52b25a394f277566c8a2a4b15a692280a300
259 lines
5.9 KiB
C
259 lines
5.9 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (c) 2004 - 2005, inAccess Networks
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*
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* Michael Manousos <manousos@inaccessnetworks.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 Headerless G.726 (16/24/32/40kbps) data format for Asterisk.
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*
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* File name extensions:
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* \arg 40 kbps: g726-40
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* \arg 32 kbps: g726-32
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* \arg 24 kbps: g726-24
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* \arg 16 kbps: g726-16
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* \ingroup formats
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*/
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/*** MODULEINFO
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<support_level>core</support_level>
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***/
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#include "asterisk.h"
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#include "asterisk/mod_format.h"
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#include "asterisk/module.h"
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#include "asterisk/endian.h"
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#include "asterisk/format_cache.h"
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#define RATE_40 0
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#define RATE_32 1
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#define RATE_24 2
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#define RATE_16 3
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/* We can only read/write chunks of FRAME_TIME ms G.726 data */
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#define FRAME_TIME 10 /* 10 ms size */
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#define BUF_SIZE (5*FRAME_TIME) /* max frame size in bytes ? */
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/* Frame sizes in bytes */
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static int frame_size[4] = {
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FRAME_TIME * 5,
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FRAME_TIME * 4,
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FRAME_TIME * 3,
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FRAME_TIME * 2
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};
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struct g726_desc {
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int rate; /* RATE_* defines */
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};
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/*
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* Rate dependant format functions (open, rewrite)
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*/
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static int g726_open(struct ast_filestream *tmp, int rate)
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{
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struct g726_desc *s = (struct g726_desc *)tmp->_private;
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s->rate = rate;
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ast_debug(1, "Created filestream G.726-%dk.\n", 40 - s->rate * 8);
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return 0;
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}
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static int g726_40_open(struct ast_filestream *s)
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{
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return g726_open(s, RATE_40);
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}
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static int g726_32_open(struct ast_filestream *s)
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{
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return g726_open(s, RATE_32);
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}
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static int g726_24_open(struct ast_filestream *s)
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{
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return g726_open(s, RATE_24);
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}
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static int g726_16_open(struct ast_filestream *s)
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{
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return g726_open(s, RATE_16);
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}
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static int g726_40_rewrite(struct ast_filestream *s, const char *comment)
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{
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return g726_open(s, RATE_40);
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}
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static int g726_32_rewrite(struct ast_filestream *s, const char *comment)
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{
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return g726_open(s, RATE_32);
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}
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static int g726_24_rewrite(struct ast_filestream *s, const char *comment)
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{
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return g726_open(s, RATE_24);
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}
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static int g726_16_rewrite(struct ast_filestream *s, const char *comment)
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{
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return g726_open(s, RATE_16);
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}
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/*
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* Rate independent format functions (read, write)
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*/
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static struct ast_frame *g726_read(struct ast_filestream *s, int *whennext)
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{
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size_t res;
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struct g726_desc *fs = (struct g726_desc *)s->_private;
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/* Send a frame from the file to the appropriate channel */
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AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, frame_size[fs->rate]);
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s->fr.samples = 8 * FRAME_TIME;
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if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) != s->fr.datalen) {
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if (res) {
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ast_log(LOG_WARNING, "Short read of %s data (expected %d bytes, read %zu): %s\n",
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ast_format_get_name(s->fr.subclass.format), s->fr.datalen, res,
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strerror(errno));
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}
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return NULL;
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}
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*whennext = s->fr.samples;
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return &s->fr;
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}
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static int g726_write(struct ast_filestream *s, struct ast_frame *f)
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{
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int res;
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struct g726_desc *fs = (struct g726_desc *)s->_private;
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if (f->datalen % frame_size[fs->rate]) {
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ast_log(LOG_WARNING, "Invalid data length %d, should be multiple of %d\n",
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f->datalen, frame_size[fs->rate]);
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return -1;
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}
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if ((res = fwrite(f->data.ptr, 1, f->datalen, s->f)) != f->datalen) {
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ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n",
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res, frame_size[fs->rate], strerror(errno));
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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 g726_seek(struct ast_filestream *fs, off_t sample_offset, int whence)
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{
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return -1;
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}
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static int g726_trunc(struct ast_filestream *fs)
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{
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return -1;
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}
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static off_t g726_tell(struct ast_filestream *fs)
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{
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return -1;
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}
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static struct ast_format_def f[] = {
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{
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.name = "g726-40",
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.exts = "g726-40",
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.open = g726_40_open,
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.rewrite = g726_40_rewrite,
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.write = g726_write,
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.seek = g726_seek,
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.trunc = g726_trunc,
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.tell = g726_tell,
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.read = g726_read,
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.buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET,
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.desc_size = sizeof(struct g726_desc),
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},
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{
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.name = "g726-32",
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.exts = "g726-32",
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.open = g726_32_open,
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.rewrite = g726_32_rewrite,
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.write = g726_write,
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.seek = g726_seek,
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.trunc = g726_trunc,
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.tell = g726_tell,
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.read = g726_read,
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.buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET,
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.desc_size = sizeof(struct g726_desc),
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},
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{
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.name = "g726-24",
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.exts = "g726-24",
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.open = g726_24_open,
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.rewrite = g726_24_rewrite,
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.write = g726_write,
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.seek = g726_seek,
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.trunc = g726_trunc,
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.tell = g726_tell,
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.read = g726_read,
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.buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET,
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.desc_size = sizeof(struct g726_desc),
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},
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{
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.name = "g726-16",
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.exts = "g726-16",
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.open = g726_16_open,
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.rewrite = g726_16_rewrite,
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.write = g726_write,
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.seek = g726_seek,
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.trunc = g726_trunc,
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.tell = g726_tell,
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.read = g726_read,
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.buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET,
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.desc_size = sizeof(struct g726_desc),
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},
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{ .desc_size = 0 } /* terminator */
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};
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static int unload_module(void)
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{
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int i;
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for (i = 0; f[i].desc_size ; i++) {
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if (ast_format_def_unregister(f[i].name))
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ast_log(LOG_WARNING, "Failed to unregister format %s.\n", f[i].name);
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}
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return(0);
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}
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static int load_module(void)
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{
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int i;
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for (i = 0; f[i].desc_size ; i++) {
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f[i].format = ast_format_g726;
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if (ast_format_def_register(&f[i])) { /* errors are fatal */
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ast_log(LOG_WARNING, "Failed to register format %s.\n", f[i].name);
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unload_module();
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return AST_MODULE_LOAD_DECLINE;
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}
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}
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return AST_MODULE_LOAD_SUCCESS;
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}
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AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "Raw G.726 (16/24/32/40kbps) data",
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.support_level = AST_MODULE_SUPPORT_CORE,
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.load = load_module,
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.unload = unload_module,
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.load_pri = AST_MODPRI_APP_DEPEND
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);
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