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00029 #include "asterisk.h"
00030
00031 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 328209 $")
00032
00033 #include "asterisk/mod_format.h"
00034 #include "asterisk/module.h"
00035 #include "asterisk/endian.h"
00036
00037 #define BUF_SIZE 320
00038 #define SLIN_SAMPLES 160
00039
00040 static struct ast_frame *slinear_read(struct ast_filestream *s, int *whennext)
00041 {
00042 int res;
00043
00044
00045 s->fr.frametype = AST_FRAME_VOICE;
00046 s->fr.subclass.codec = AST_FORMAT_SLINEAR;
00047 s->fr.mallocd = 0;
00048 AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, BUF_SIZE);
00049 if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) < 1) {
00050 if (res)
00051 ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
00052 return NULL;
00053 }
00054 *whennext = s->fr.samples = res/2;
00055 s->fr.datalen = res;
00056 return &s->fr;
00057 }
00058
00059 static int slinear_write(struct ast_filestream *fs, struct ast_frame *f)
00060 {
00061 int res;
00062 if (f->frametype != AST_FRAME_VOICE) {
00063 ast_log(LOG_WARNING, "Asked to write non-voice frame!\n");
00064 return -1;
00065 }
00066 if (f->subclass.codec != AST_FORMAT_SLINEAR) {
00067 ast_log(LOG_WARNING, "Asked to write non-slinear frame (%s)!\n", ast_getformatname(f->subclass.codec));
00068 return -1;
00069 }
00070 if ((res = fwrite(f->data.ptr, 1, f->datalen, fs->f)) != f->datalen) {
00071 ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n", res, f->datalen, strerror(errno));
00072 return -1;
00073 }
00074 return 0;
00075 }
00076
00077 static int slinear_seek(struct ast_filestream *fs, off_t sample_offset, int whence)
00078 {
00079 off_t offset=0,min,cur,max;
00080
00081 min = 0;
00082 sample_offset <<= 1;
00083 cur = ftello(fs->f);
00084 fseeko(fs->f, 0, SEEK_END);
00085 max = ftello(fs->f);
00086 if (whence == SEEK_SET)
00087 offset = sample_offset;
00088 else if (whence == SEEK_CUR || whence == SEEK_FORCECUR)
00089 offset = sample_offset + cur;
00090 else if (whence == SEEK_END)
00091 offset = max - sample_offset;
00092 if (whence != SEEK_FORCECUR) {
00093 offset = (offset > max)?max:offset;
00094 }
00095
00096 offset = (offset < min)?min:offset;
00097 return fseeko(fs->f, offset, SEEK_SET);
00098 }
00099
00100 static int slinear_trunc(struct ast_filestream *fs)
00101 {
00102 return ftruncate(fileno(fs->f), ftello(fs->f));
00103 }
00104
00105 static off_t slinear_tell(struct ast_filestream *fs)
00106 {
00107 return ftello(fs->f) / 2;
00108 }
00109
00110 static const struct ast_format slin_f = {
00111 .name = "sln",
00112 .exts = "sln|raw",
00113 .format = AST_FORMAT_SLINEAR,
00114 .write = slinear_write,
00115 .seek = slinear_seek,
00116 .trunc = slinear_trunc,
00117 .tell = slinear_tell,
00118 .read = slinear_read,
00119 .buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET,
00120 };
00121
00122 static int load_module(void)
00123 {
00124 if (ast_format_register(&slin_f))
00125 return AST_MODULE_LOAD_FAILURE;
00126 return AST_MODULE_LOAD_SUCCESS;
00127 }
00128
00129 static int unload_module(void)
00130 {
00131 return ast_format_unregister(slin_f.name);
00132 }
00133
00134 AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "Raw Signed Linear Audio support (SLN)",
00135 .load = load_module,
00136 .unload = unload_module,
00137 .load_pri = AST_MODPRI_APP_DEPEND
00138 );