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00026 #include "asterisk.h"
00027
00028 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 117802 $")
00029
00030 #include "asterisk/mod_format.h"
00031 #include "asterisk/module.h"
00032 #include "asterisk/endian.h"
00033
00034 #define BUF_SIZE 640
00035 #define SLIN_SAMPLES 320
00036
00037 static struct ast_frame *slinear_read(struct ast_filestream *s, int *whennext)
00038 {
00039 int res;
00040
00041
00042 s->fr.frametype = AST_FRAME_VOICE;
00043 s->fr.subclass = AST_FORMAT_SLINEAR16;
00044 s->fr.mallocd = 0;
00045 AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, BUF_SIZE);
00046 if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) < 1) {
00047 if (res)
00048 ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
00049 return NULL;
00050 }
00051 *whennext = s->fr.samples = res/2;
00052 s->fr.datalen = res;
00053 return &s->fr;
00054 }
00055
00056 static int slinear_write(struct ast_filestream *fs, struct ast_frame *f)
00057 {
00058 int res;
00059
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_SLINEAR16) {
00065 ast_log(LOG_WARNING, "Asked to write non-slinear16 frame (%d)!\n", f->subclass);
00066 return -1;
00067 }
00068 if ((res = fwrite(f->data.ptr, 1, f->datalen, fs->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 slinear_seek(struct ast_filestream *fs, off_t sample_offset, int whence)
00076 {
00077 off_t offset = 0, min = 0, cur, max;
00078
00079 sample_offset <<= 1;
00080
00081 cur = ftello(fs->f);
00082
00083 fseeko(fs->f, 0, SEEK_END);
00084
00085 max = ftello(fs->f);
00086
00087 if (whence == SEEK_SET)
00088 offset = sample_offset;
00089 else if (whence == SEEK_CUR || whence == SEEK_FORCECUR)
00090 offset = sample_offset + cur;
00091 else if (whence == SEEK_END)
00092 offset = max - sample_offset;
00093
00094 if (whence != SEEK_FORCECUR)
00095 offset = (offset > max) ? max : offset;
00096
00097
00098 offset = (offset < min) ? min : offset;
00099
00100 return fseeko(fs->f, offset, SEEK_SET);
00101 }
00102
00103 static int slinear_trunc(struct ast_filestream *fs)
00104 {
00105 return ftruncate(fileno(fs->f), ftello(fs->f));
00106 }
00107
00108 static off_t slinear_tell(struct ast_filestream *fs)
00109 {
00110 return ftello(fs->f) / 2;
00111 }
00112
00113 static const struct ast_format slin_f = {
00114 .name = "sln16",
00115 .exts = "sln16",
00116 .format = AST_FORMAT_SLINEAR16,
00117 .write = slinear_write,
00118 .seek = slinear_seek,
00119 .trunc = slinear_trunc,
00120 .tell = slinear_tell,
00121 .read = slinear_read,
00122 .buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET,
00123 };
00124
00125 static int load_module(void)
00126 {
00127 if (ast_format_register(&slin_f))
00128 return AST_MODULE_LOAD_FAILURE;
00129
00130 return AST_MODULE_LOAD_SUCCESS;
00131 }
00132
00133 static int unload_module(void)
00134 {
00135 return ast_format_unregister(slin_f.name);
00136 }
00137
00138 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Raw Signed Linear 16KHz Audio support (SLN16)");