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-rw-r--r--trunk/formats/format_vox.c135
1 files changed, 135 insertions, 0 deletions
diff --git a/trunk/formats/format_vox.c b/trunk/formats/format_vox.c
new file mode 100644
index 000000000..f22b4881a
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+++ b/trunk/formats/format_vox.c
@@ -0,0 +1,135 @@
+/*
+ * 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 Flat, binary, ADPCM vox file format.
+ * \arg File name extensions: vox
+ *
+ * \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 80 /* 80 bytes, 160 samples */
+#define VOX_SAMPLES 160
+
+static struct ast_frame *vox_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_ADPCM;
+ 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 vox_write(struct ast_filestream *s, 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_ADPCM) {
+ ast_log(LOG_WARNING, "Asked to write non-ADPCM frame (%d)!\n", f->subclass);
+ return -1;
+ }
+ if ((res = fwrite(f->data, 1, f->datalen, s->f)) != f->datalen) {
+ ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n", res, f->datalen, strerror(errno));
+ return -1;
+ }
+ return 0;
+}
+
+static int vox_seek(struct ast_filestream *fs, off_t sample_offset, int whence)
+{
+ off_t offset=0,min,cur,max,distance;
+
+ min = 0;
+ cur = ftello(fs->f);
+ fseeko(fs->f, 0, SEEK_END);
+ max = ftello(fs->f);
+
+ /* have to fudge to frame here, so not fully to sample */
+ distance = sample_offset/2;
+ if(whence == SEEK_SET)
+ offset = distance;
+ else if(whence == SEEK_CUR || whence == SEEK_FORCECUR)
+ offset = distance + cur;
+ else if(whence == SEEK_END)
+ offset = max - distance;
+ if (whence != SEEK_FORCECUR) {
+ offset = (offset > max)?max:offset;
+ offset = (offset < min)?min:offset;
+ }
+ return fseeko(fs->f, offset, SEEK_SET);
+}
+
+static int vox_trunc(struct ast_filestream *fs)
+{
+ return ftruncate(fileno(fs->f), ftello(fs->f));
+}
+
+static off_t vox_tell(struct ast_filestream *fs)
+{
+ off_t offset;
+ offset = ftello(fs->f) << 1;
+ return offset;
+}
+
+static const struct ast_format vox_f = {
+ .name = "vox",
+ .exts = "vox",
+ .format = AST_FORMAT_ADPCM,
+ .write = vox_write,
+ .seek = vox_seek,
+ .trunc = vox_trunc,
+ .tell = vox_tell,
+ .read = vox_read,
+ .buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET,
+};
+
+static int load_module(void)
+{
+ if (ast_format_register(&vox_f))
+ return AST_MODULE_LOAD_FAILURE;
+ return AST_MODULE_LOAD_SUCCESS;
+}
+
+static int unload_module(void)
+{
+ return ast_format_unregister(vox_f.name);
+}
+
+AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Dialogic VOX (ADPCM) File Format");