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Diffstat (limited to 'trunk/formats/format_g723.c')
| -rw-r--r-- | trunk/formats/format_g723.c | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/trunk/formats/format_g723.c b/trunk/formats/format_g723.c new file mode 100644 index 000000000..6e57b4fa8 --- /dev/null +++ b/trunk/formats/format_g723.c @@ -0,0 +1,152 @@ +/* + * 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 Old-style G.723.1 frame/timestamp format. + * + * \arg Extensions: g723, g723sf + * \ingroup formats + */ + +#include "asterisk.h" + +ASTERISK_FILE_VERSION(__FILE__, "$Revision$") + +#include "asterisk/mod_format.h" +#include "asterisk/module.h" + +#define G723_MAX_SIZE 1024 + +static struct ast_frame *g723_read(struct ast_filestream *s, int *whennext) +{ + unsigned short size; + int res; + int delay; + /* Read the delay for the next packet, and schedule again if necessary */ + /* XXX is this ignored ? */ + if (fread(&delay, 1, 4, s->f) == 4) + delay = ntohl(delay); + else + delay = -1; + if (fread(&size, 1, 2, s->f) != 2) { + /* Out of data, or the file is no longer valid. In any case + go ahead and stop the stream */ + return NULL; + } + /* Looks like we have a frame to read from here */ + size = ntohs(size); + if (size > G723_MAX_SIZE) { + ast_log(LOG_WARNING, "Size %d is invalid\n", size); + /* The file is apparently no longer any good, as we + shouldn't ever get frames even close to this + size. */ + return NULL; + } + /* Read the data into the buffer */ + s->fr.frametype = AST_FRAME_VOICE; + s->fr.subclass = AST_FORMAT_G723_1; + s->fr.mallocd = 0; + AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, size); + if ((res = fread(s->fr.data, 1, s->fr.datalen, s->f)) != size) { + ast_log(LOG_WARNING, "Short read (%d of %d bytes) (%s)!\n", res, size, strerror(errno)); + return NULL; + } + *whennext = s->fr.samples = 240; + return &s->fr; +} + +static int g723_write(struct ast_filestream *s, struct ast_frame *f) +{ + uint32_t delay; + uint16_t size; + int res; + /* XXX there used to be a check s->fr means a read stream */ + if (f->frametype != AST_FRAME_VOICE) { + ast_log(LOG_WARNING, "Asked to write non-voice frame!\n"); + return -1; + } + if (f->subclass != AST_FORMAT_G723_1) { + ast_log(LOG_WARNING, "Asked to write non-g723 frame!\n"); + return -1; + } + delay = 0; + if (f->datalen <= 0) { + ast_log(LOG_WARNING, "Short frame ignored (%d bytes long?)\n", f->datalen); + return 0; + } + if ((res = fwrite(&delay, 1, 4, s->f)) != 4) { + ast_log(LOG_WARNING, "Unable to write delay: res=%d (%s)\n", res, strerror(errno)); + return -1; + } + size = htons(f->datalen); + if ((res = fwrite(&size, 1, 2, s->f)) != 2) { + ast_log(LOG_WARNING, "Unable to write size: res=%d (%s)\n", res, strerror(errno)); + return -1; + } + if ((res = fwrite(f->data, 1, f->datalen, s->f)) != f->datalen) { + ast_log(LOG_WARNING, "Unable to write frame: res=%d (%s)\n", res, strerror(errno)); + return -1; + } + return 0; +} + +static int g723_seek(struct ast_filestream *fs, off_t sample_offset, int whence) +{ + return -1; +} + +static int g723_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 g723_tell(struct ast_filestream *fs) +{ + return -1; +} + +static const struct ast_format g723_1_f = { + .name = "g723sf", + .exts = "g723|g723sf", + .format = AST_FORMAT_G723_1, + .write = g723_write, + .seek = g723_seek, + .trunc = g723_trunc, + .tell = g723_tell, + .read = g723_read, + .buf_size = G723_MAX_SIZE + AST_FRIENDLY_OFFSET, +}; + +static int load_module(void) +{ + if (ast_format_register(&g723_1_f)) + return AST_MODULE_LOAD_FAILURE; + return AST_MODULE_LOAD_SUCCESS; +} + +static int unload_module(void) +{ + return ast_format_unregister(g723_1_f.name); +} + +AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "G.723.1 Simple Timestamp File Format"); |