diff options
author | David Vossel <dvossel@digium.com> | 2010-06-16 19:03:24 +0000 |
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committer | David Vossel <dvossel@digium.com> | 2010-06-16 19:03:24 +0000 |
commit | fcb055fb4ec3fb5918c03948dee3f1c7b65b31df (patch) | |
tree | eb89a0c0e7202e0334ef137f72ccc24c3f646432 /formats | |
parent | 0bf94685fdc87543fe2f894928ee48245e527875 (diff) |
addition of G.719 pass-through support
(closes issue #16293)
Reported by: malcolmd
Patches:
g719.passthrough.patch.7 uploaded by malcolmd (license 924)
format_g719.c uploaded by malcolmd (license 924)
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@270940 65c4cc65-6c06-0410-ace0-fbb531ad65f3
Diffstat (limited to 'formats')
-rw-r--r-- | formats/format_g719.c | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/formats/format_g719.c b/formats/format_g719.c new file mode 100644 index 000000000..779bea996 --- /dev/null +++ b/formats/format_g719.c @@ -0,0 +1,143 @@ +/* + * Asterisk -- An open source telephony toolkit. + * + * Copyright (C) 1999 - 2010, Anthony Minessale and Digium, Inc. + * Anthony Minessale (anthmct@yahoo.com) + * Kevin P. Fleming <kpfleming@digium.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 ITU G.719 , 64kbps bitrate only + * \arg File name extensions: g719 + * \ingroup formats + */ + +#include "asterisk.h" + +ASTERISK_FILE_VERSION(__FILE__, "$Revision$") + +#include "asterisk/mod_format.h" +#include "asterisk/module.h" +#include "asterisk/endian.h" + +#define BUF_SIZE 160 /* 20 milliseconds == 160 bytes, 960 samples */ +#define SAMPLES_TO_BYTES(x) ((typeof(x)) x / ((float) 960 / 160)) +#define BYTES_TO_SAMPLES(x) ((typeof(x)) x * ((float) 960 / 160)) + +static struct ast_frame *g719read(struct ast_filestream *s, int *whennext) +{ + int res; + /* Send a frame from the file to the appropriate channel */ + + s->fr.frametype = AST_FRAME_VOICE; + s->fr.subclass.codec = AST_FORMAT_G719; + s->fr.mallocd = 0; + AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, BUF_SIZE); + if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) != s->fr.datalen) { + if (res) + ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno)); + return NULL; + } + *whennext = s->fr.samples = BYTES_TO_SAMPLES(res); + return &s->fr; +} + +static int g719write(struct ast_filestream *fs, struct ast_frame *f) +{ + int res; + + if (f->frametype != AST_FRAME_VOICE) { + ast_log(LOG_WARNING, "Asked to write non-voice frame!\n"); + return -1; + } + if (f->subclass.codec != AST_FORMAT_G719) { + ast_log(LOG_WARNING, "Asked to write non-G.719 frame (%s)!\n", ast_getformatname(f->subclass.codec)); + return -1; + } + if ((res = fwrite(f->data.ptr, 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 g719seek(struct ast_filestream *fs, off_t sample_offset, int whence) +{ + off_t offset = 0, min = 0, cur, max; + + sample_offset = SAMPLES_TO_BYTES(sample_offset); + + cur = ftello(fs->f); + + fseeko(fs->f, 0, SEEK_END); + + max = ftello(fs->f); + + if (whence == SEEK_SET) + offset = sample_offset; + else if (whence == SEEK_CUR || whence == SEEK_FORCECUR) + offset = sample_offset + cur; + else if (whence == SEEK_END) + offset = max - sample_offset; + + if (whence != SEEK_FORCECUR) + offset = (offset > max) ? max : offset; + + /* always protect against seeking past begining. */ + offset = (offset < min) ? min : offset; + + return fseeko(fs->f, offset, SEEK_SET); +} + +static int g719trunc(struct ast_filestream *fs) +{ + return ftruncate(fileno(fs->f), ftello(fs->f)); +} + +static off_t g719tell(struct ast_filestream *fs) +{ + return BYTES_TO_SAMPLES(ftello(fs->f)); +} + +static const struct ast_format g719_f = { + .name = "g719", + .exts = "g719", + .format = AST_FORMAT_G719, + .write = g719write, + .seek = g719seek, + .trunc = g719trunc, + .tell = g719tell, + .read = g719read, + .buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET, +}; + +static int load_module(void) +{ + if (ast_format_register(&g719_f)) + return AST_MODULE_LOAD_DECLINE; + + return AST_MODULE_LOAD_SUCCESS; +} + +static int unload_module(void) +{ + return ast_format_unregister(g719_f.name); +} + +AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER,"ITU G.719", + .load = load_module, + .unload = unload_module, + .load_pri = 10, +); + |