diff options
Diffstat (limited to 'trunk/formats/format_sln.c')
-rw-r--r-- | trunk/formats/format_sln.c | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/trunk/formats/format_sln.c b/trunk/formats/format_sln.c new file mode 100644 index 000000000..51f796271 --- /dev/null +++ b/trunk/formats/format_sln.c @@ -0,0 +1,130 @@ +/* + * Asterisk -- An open source telephony toolkit. + * + * Copyright (C) 1999 - 2005, Anthony Minessale + * 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 RAW SLINEAR Format + * \arg File name extensions: sln, raw + * \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 320 /* 320 bytes, 160 samples */ +#define SLIN_SAMPLES 160 + +static struct ast_frame *slinear_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_SLINEAR; + s->fr.mallocd = 0; + 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)) < 1) { + if (res) + ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno)); + return NULL; + } + *whennext = s->fr.samples = res/2; + s->fr.datalen = res; + return &s->fr; +} + +static int slinear_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_SLINEAR) { + ast_log(LOG_WARNING, "Asked to write non-slinear frame (%d)!\n", f->subclass); + return -1; + } + 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 slinear_seek(struct ast_filestream *fs, off_t sample_offset, int whence) +{ + off_t offset=0,min,cur,max; + + min = 0; + sample_offset <<= 1; + 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 slinear_trunc(struct ast_filestream *fs) +{ + return ftruncate(fileno(fs->f), ftello(fs->f)); +} + +static off_t slinear_tell(struct ast_filestream *fs) +{ + return ftello(fs->f) / 2; +} + +static const struct ast_format slin_f = { + .name = "sln", + .exts = "sln|raw", + .format = AST_FORMAT_SLINEAR, + .write = slinear_write, + .seek = slinear_seek, + .trunc = slinear_trunc, + .tell = slinear_tell, + .read = slinear_read, + .buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET, +}; + +static int load_module(void) +{ + if (ast_format_register(&slin_f)) + return AST_MODULE_LOAD_FAILURE; + return AST_MODULE_LOAD_SUCCESS; +} + +static int unload_module(void) +{ + return ast_format_unregister(slin_f.name); +} + +AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Raw Signed Linear Audio support (SLN)"); |