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Diffstat (limited to 'formats/format_g729.c')
| -rw-r--r-- | formats/format_g729.c | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/formats/format_g729.c b/formats/format_g729.c new file mode 100644 index 000000000..3f46bcbff --- /dev/null +++ b/formats/format_g729.c @@ -0,0 +1,159 @@ +/* + * Asterisk -- An open source telephony toolkit. + * + * Copyright (C) 1999 - 2005, Digium, Inc. + * + * Mark Spencer <markster@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 Save to raw, headerless G729 data. + * \note This is not an encoder/decoder. The codec fo g729 is only + * available with a commercial license from Digium, due to patent + * restrictions. Check http://www.digium.com for information. + * \arg Extensions: g729 + * \ingroup formats + */ + +#include "asterisk.h" + +ASTERISK_FILE_VERSION(__FILE__, "$Revision$") + +#include <unistd.h> +#include <netinet/in.h> +#include <arpa/inet.h> +#include <stdlib.h> +#include <sys/time.h> +#include <stdio.h> +#include <errno.h> +#include <string.h> + +#include "asterisk/lock.h" +#include "asterisk/channel.h" +#include "asterisk/file.h" +#include "asterisk/logger.h" +#include "asterisk/sched.h" +#include "asterisk/module.h" +#include "asterisk/endian.h" + +/* Some Ideas for this code came from makeg729e.c by Jeffrey Chilton */ + +/* Portions of the conversion code are by guido@sienanet.it */ + +#define BUF_SIZE 20 /* two G729 frames */ +#define G729A_SAMPLES 160 + +static struct ast_frame *g729_read(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 = AST_FORMAT_G729A; + s->fr.mallocd = 0; + s->fr.samples = G729A_SAMPLES; + AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, BUF_SIZE); + if ((res = fread(s->fr.data, 1, s->fr.datalen, s->f)) != s->fr.datalen) { + if (res && (res != 10)) /* XXX what for ? */ + ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno)); + return NULL; + } + *whennext = s->fr.samples; + return &s->fr; +} + +static int g729_write(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 != AST_FORMAT_G729A) { + ast_log(LOG_WARNING, "Asked to write non-G729 frame (%d)!\n", f->subclass); + return -1; + } + if (f->datalen % 10) { + ast_log(LOG_WARNING, "Invalid data length, %d, should be multiple of 10\n", f->datalen); + return -1; + } + if ((res = fwrite(f->data, 1, f->datalen, fs->f)) != f->datalen) { + ast_log(LOG_WARNING, "Bad write (%d/10): %s\n", res, strerror(errno)); + return -1; + } + return 0; +} + +static int g729_seek(struct ast_filestream *fs, off_t sample_offset, int whence) +{ + long bytes; + off_t min,cur,max,offset=0; + min = 0; + cur = ftello(fs->f); + fseeko(fs->f, 0, SEEK_END); + max = ftello(fs->f); + + bytes = BUF_SIZE * (sample_offset / G729A_SAMPLES); + if (whence == SEEK_SET) + offset = bytes; + else if (whence == SEEK_CUR || whence == SEEK_FORCECUR) + offset = cur + bytes; + else if (whence == SEEK_END) + offset = max - bytes; + if (whence != SEEK_FORCECUR) { + offset = (offset > max)?max:offset; + } + /* protect against seeking beyond begining. */ + offset = (offset < min)?min:offset; + if (fseeko(fs->f, offset, SEEK_SET) < 0) + return -1; + return 0; +} + +static int g729_trunc(struct ast_filestream *fs) +{ + /* Truncate file to current length */ + if (ftruncate(fileno(fs->f), ftello(fs->f)) < 0) + return -1; + return 0; +} + +static off_t g729_tell(struct ast_filestream *fs) +{ + off_t offset = ftello(fs->f); + return (offset/BUF_SIZE)*G729A_SAMPLES; +} + +static const struct ast_format g729_f = { + .name = "g729", + .exts = "g729", + .format = AST_FORMAT_G729A, + .write = g729_write, + .seek = g729_seek, + .trunc = g729_trunc, + .tell = g729_tell, + .read = g729_read, + .buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET, +}; + +static int load_module(void) +{ + return ast_format_register(&g729_f); +} + +static int unload_module(void) +{ + return ast_format_unregister(g729_f.name); +} + +AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Raw G729 data"); |