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00033 #include "asterisk.h"
00034
00035 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 364578 $")
00036
00037 #include "asterisk/mod_format.h"
00038 #include "asterisk/module.h"
00039 #include "asterisk/endian.h"
00040
00041
00042
00043
00044
00045 #define BUF_SIZE 20
00046 #define G729A_SAMPLES 160
00047
00048 static struct ast_frame *g729_read(struct ast_filestream *s, int *whennext)
00049 {
00050 int res;
00051
00052 s->fr.frametype = AST_FRAME_VOICE;
00053 s->fr.subclass.codec = AST_FORMAT_G729A;
00054 s->fr.mallocd = 0;
00055 s->fr.samples = G729A_SAMPLES;
00056 AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, BUF_SIZE);
00057 if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) != s->fr.datalen) {
00058 if (res && (res != 10))
00059 ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
00060 return NULL;
00061 }
00062 *whennext = s->fr.samples;
00063 return &s->fr;
00064 }
00065
00066 static int g729_write(struct ast_filestream *fs, struct ast_frame *f)
00067 {
00068 int res;
00069 if (f->frametype != AST_FRAME_VOICE) {
00070 ast_log(LOG_WARNING, "Asked to write non-voice frame!\n");
00071 return -1;
00072 }
00073 if (f->subclass.codec != AST_FORMAT_G729A) {
00074 ast_log(LOG_WARNING, "Asked to write non-G729 frame (%s)!\n", ast_getformatname(f->subclass.codec));
00075 return -1;
00076 }
00077 if (f->datalen % 10) {
00078 ast_log(LOG_WARNING, "Invalid data length, %d, should be multiple of 10\n", f->datalen);
00079 return -1;
00080 }
00081 if ((res = fwrite(f->data.ptr, 1, f->datalen, fs->f)) != f->datalen) {
00082 ast_log(LOG_WARNING, "Bad write (%d/10): %s\n", res, strerror(errno));
00083 return -1;
00084 }
00085 return 0;
00086 }
00087
00088 static int g729_seek(struct ast_filestream *fs, off_t sample_offset, int whence)
00089 {
00090 long bytes;
00091 off_t min,cur,max,offset=0;
00092 min = 0;
00093 cur = ftello(fs->f);
00094 fseeko(fs->f, 0, SEEK_END);
00095 max = ftello(fs->f);
00096
00097 bytes = BUF_SIZE * (sample_offset / G729A_SAMPLES);
00098 if (whence == SEEK_SET)
00099 offset = bytes;
00100 else if (whence == SEEK_CUR || whence == SEEK_FORCECUR)
00101 offset = cur + bytes;
00102 else if (whence == SEEK_END)
00103 offset = max - bytes;
00104 if (whence != SEEK_FORCECUR) {
00105 offset = (offset > max)?max:offset;
00106 }
00107
00108 offset = (offset < min)?min:offset;
00109 if (fseeko(fs->f, offset, SEEK_SET) < 0)
00110 return -1;
00111 return 0;
00112 }
00113
00114 static int g729_trunc(struct ast_filestream *fs)
00115 {
00116 int fd;
00117 off_t cur;
00118
00119 if ((fd = fileno(fs->f)) < 0) {
00120 ast_log(AST_LOG_WARNING, "Unable to determine file descriptor for g729 filestream %p: %s\n", fs, strerror(errno));
00121 return -1;
00122 }
00123 if ((cur = ftello(fs->f)) < 0) {
00124 ast_log(AST_LOG_WARNING, "Unable to determine current position in g729 filestream %p: %s\n", fs, strerror(errno));
00125 return -1;
00126 }
00127
00128 return ftruncate(fd, cur);
00129 }
00130
00131 static off_t g729_tell(struct ast_filestream *fs)
00132 {
00133 off_t offset = ftello(fs->f);
00134 return (offset/BUF_SIZE)*G729A_SAMPLES;
00135 }
00136
00137 static const struct ast_format g729_f = {
00138 .name = "g729",
00139 .exts = "g729",
00140 .format = AST_FORMAT_G729A,
00141 .write = g729_write,
00142 .seek = g729_seek,
00143 .trunc = g729_trunc,
00144 .tell = g729_tell,
00145 .read = g729_read,
00146 .buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET,
00147 };
00148
00149 static int load_module(void)
00150 {
00151 if (ast_format_register(&g729_f))
00152 return AST_MODULE_LOAD_FAILURE;
00153 return AST_MODULE_LOAD_SUCCESS;
00154 }
00155
00156 static int unload_module(void)
00157 {
00158 return ast_format_unregister(g729_f.name);
00159 }
00160
00161 AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "Raw G.729 data",
00162 .load = load_module,
00163 .unload = unload_module,
00164 .load_pri = AST_MODPRI_APP_DEPEND
00165 );