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00030 #include "asterisk.h"
00031
00032 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 328209 $")
00033
00034 #include "asterisk/mod_format.h"
00035 #include "asterisk/module.h"
00036 #include "asterisk/endian.h"
00037
00038 #define BUF_SIZE 640
00039 #define SLIN_SAMPLES 320
00040
00041 static struct ast_frame *slinear_read(struct ast_filestream *s, int *whennext)
00042 {
00043 int res;
00044
00045
00046 s->fr.frametype = AST_FRAME_VOICE;
00047 s->fr.subclass.codec = AST_FORMAT_SLINEAR16;
00048 s->fr.mallocd = 0;
00049 AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, BUF_SIZE);
00050 if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) < 1) {
00051 if (res)
00052 ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
00053 return NULL;
00054 }
00055 *whennext = s->fr.samples = res/2;
00056 s->fr.datalen = res;
00057 return &s->fr;
00058 }
00059
00060 static int slinear_write(struct ast_filestream *fs, struct ast_frame *f)
00061 {
00062 int res;
00063
00064 if (f->frametype != AST_FRAME_VOICE) {
00065 ast_log(LOG_WARNING, "Asked to write non-voice frame!\n");
00066 return -1;
00067 }
00068 if (f->subclass.codec != AST_FORMAT_SLINEAR16) {
00069 ast_log(LOG_WARNING, "Asked to write non-slinear16 frame (%s)!\n", ast_getformatname(f->subclass.codec));
00070 return -1;
00071 }
00072 if ((res = fwrite(f->data.ptr, 1, f->datalen, fs->f)) != f->datalen) {
00073 ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n", res, f->datalen, strerror(errno));
00074 return -1;
00075 }
00076 return 0;
00077 }
00078
00079 static int slinear_seek(struct ast_filestream *fs, off_t sample_offset, int whence)
00080 {
00081 off_t offset = 0, min = 0, cur, max;
00082
00083 sample_offset <<= 1;
00084
00085 cur = ftello(fs->f);
00086
00087 fseeko(fs->f, 0, SEEK_END);
00088
00089 max = ftello(fs->f);
00090
00091 if (whence == SEEK_SET)
00092 offset = sample_offset;
00093 else if (whence == SEEK_CUR || whence == SEEK_FORCECUR)
00094 offset = sample_offset + cur;
00095 else if (whence == SEEK_END)
00096 offset = max - sample_offset;
00097
00098 if (whence != SEEK_FORCECUR)
00099 offset = (offset > max) ? max : offset;
00100
00101
00102 offset = (offset < min) ? min : offset;
00103
00104 return fseeko(fs->f, offset, SEEK_SET);
00105 }
00106
00107 static int slinear_trunc(struct ast_filestream *fs)
00108 {
00109 return ftruncate(fileno(fs->f), ftello(fs->f));
00110 }
00111
00112 static off_t slinear_tell(struct ast_filestream *fs)
00113 {
00114 return ftello(fs->f) / 2;
00115 }
00116
00117 static const struct ast_format slin_f = {
00118 .name = "sln16",
00119 .exts = "sln16",
00120 .format = AST_FORMAT_SLINEAR16,
00121 .write = slinear_write,
00122 .seek = slinear_seek,
00123 .trunc = slinear_trunc,
00124 .tell = slinear_tell,
00125 .read = slinear_read,
00126 .buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET,
00127 };
00128
00129 static int load_module(void)
00130 {
00131 if (ast_format_register(&slin_f))
00132 return AST_MODULE_LOAD_FAILURE;
00133
00134 return AST_MODULE_LOAD_SUCCESS;
00135 }
00136
00137 static int unload_module(void)
00138 {
00139 return ast_format_unregister(slin_f.name);
00140 }
00141
00142 AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "Raw Signed Linear 16KHz Audio support (SLN16)",
00143 .load = load_module,
00144 .unload = unload_module,
00145 .load_pri = AST_MODPRI_APP_DEPEND
00146 );