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00027 #include "asterisk.h"
00028
00029 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 233693 $")
00030
00031 #include "asterisk/mod_format.h"
00032 #include "asterisk/module.h"
00033 #include "asterisk/endian.h"
00034
00035 #define BUF_SIZE 80
00036 #define VOX_SAMPLES 160
00037
00038 static struct ast_frame *vox_read(struct ast_filestream *s, int *whennext)
00039 {
00040 int res;
00041
00042
00043 s->fr.frametype = AST_FRAME_VOICE;
00044 s->fr.subclass = AST_FORMAT_ADPCM;
00045 s->fr.mallocd = 0;
00046 AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, BUF_SIZE);
00047 if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) < 1) {
00048 if (res)
00049 ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
00050 return NULL;
00051 }
00052 *whennext = s->fr.samples = res * 2;
00053 s->fr.datalen = res;
00054 return &s->fr;
00055 }
00056
00057 static int vox_write(struct ast_filestream *s, struct ast_frame *f)
00058 {
00059 int res;
00060 if (f->frametype != AST_FRAME_VOICE) {
00061 ast_log(LOG_WARNING, "Asked to write non-voice frame!\n");
00062 return -1;
00063 }
00064 if (f->subclass != AST_FORMAT_ADPCM) {
00065 ast_log(LOG_WARNING, "Asked to write non-ADPCM frame (%d)!\n", f->subclass);
00066 return -1;
00067 }
00068 if ((res = fwrite(f->data.ptr, 1, f->datalen, s->f)) != f->datalen) {
00069 ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n", res, f->datalen, strerror(errno));
00070 return -1;
00071 }
00072 return 0;
00073 }
00074
00075 static int vox_seek(struct ast_filestream *fs, off_t sample_offset, int whence)
00076 {
00077 off_t offset=0,min,cur,max,distance;
00078
00079 min = 0;
00080 cur = ftello(fs->f);
00081 fseeko(fs->f, 0, SEEK_END);
00082 max = ftello(fs->f);
00083
00084
00085 distance = sample_offset/2;
00086 if(whence == SEEK_SET)
00087 offset = distance;
00088 else if(whence == SEEK_CUR || whence == SEEK_FORCECUR)
00089 offset = distance + cur;
00090 else if(whence == SEEK_END)
00091 offset = max - distance;
00092 if (whence != SEEK_FORCECUR) {
00093 offset = (offset > max)?max:offset;
00094 offset = (offset < min)?min:offset;
00095 }
00096 return fseeko(fs->f, offset, SEEK_SET);
00097 }
00098
00099 static int vox_trunc(struct ast_filestream *fs)
00100 {
00101 return ftruncate(fileno(fs->f), ftello(fs->f));
00102 }
00103
00104 static off_t vox_tell(struct ast_filestream *fs)
00105 {
00106 off_t offset;
00107 offset = ftello(fs->f) << 1;
00108 return offset;
00109 }
00110
00111 static const struct ast_format vox_f = {
00112 .name = "vox",
00113 .exts = "vox",
00114 .format = AST_FORMAT_ADPCM,
00115 .write = vox_write,
00116 .seek = vox_seek,
00117 .trunc = vox_trunc,
00118 .tell = vox_tell,
00119 .read = vox_read,
00120 .buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET,
00121 };
00122
00123 static int load_module(void)
00124 {
00125 if (ast_format_register(&vox_f))
00126 return AST_MODULE_LOAD_FAILURE;
00127 return AST_MODULE_LOAD_SUCCESS;
00128 }
00129
00130 static int unload_module(void)
00131 {
00132 return ast_format_unregister(vox_f.name);
00133 }
00134
00135 AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "Dialogic VOX (ADPCM) File Format",
00136 .load = load_module,
00137 .unload = unload_module,
00138 .load_pri = 10,
00139 );