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00029 #include "asterisk.h"
00030
00031 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 364578 $")
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 = 0, cur, max;
00080
00081 sample_offset <<= 1;
00082
00083 if ((cur = ftello(fs->f)) < 0) {
00084 ast_log(AST_LOG_WARNING, "Unable to determine current position in sln filestream %p: %s\n", fs, strerror(errno));
00085 return -1;
00086 }
00087
00088 if (fseeko(fs->f, 0, SEEK_END) < 0) {
00089 ast_log(AST_LOG_WARNING, "Unable to seek to end of sln filestream %p: %s\n", fs, strerror(errno));
00090 return -1;
00091 }
00092
00093 if ((max = ftello(fs->f)) < 0) {
00094 ast_log(AST_LOG_WARNING, "Unable to determine max position in sln filestream %p: %s\n", fs, strerror(errno));
00095 return -1;
00096 }
00097
00098 if (whence == SEEK_SET)
00099 offset = sample_offset;
00100 else if (whence == SEEK_CUR || whence == SEEK_FORCECUR)
00101 offset = sample_offset + cur;
00102 else if (whence == SEEK_END)
00103 offset = max - sample_offset;
00104 if (whence != SEEK_FORCECUR) {
00105 offset = (offset > max)?max:offset;
00106 }
00107
00108 offset = (offset < min)?min:offset;
00109 return fseeko(fs->f, offset, SEEK_SET);
00110 }
00111
00112 static int slinear_trunc(struct ast_filestream *fs)
00113 {
00114 int fd;
00115 off_t cur;
00116
00117 if ((fd = fileno(fs->f)) < 0) {
00118 ast_log(AST_LOG_WARNING, "Unable to determine file descriptor for sln filestream %p: %s\n", fs, strerror(errno));
00119 return -1;
00120 }
00121 if ((cur = ftello(fs->f)) < 0) {
00122 ast_log(AST_LOG_WARNING, "Unable to determine current position in sln filestream %p: %s\n", fs, strerror(errno));
00123 return -1;
00124 }
00125
00126 return ftruncate(fd, cur);
00127 }
00128
00129 static off_t slinear_tell(struct ast_filestream *fs)
00130 {
00131 return ftello(fs->f) / 2;
00132 }
00133
00134 static const struct ast_format slin_f = {
00135 .name = "sln",
00136 .exts = "sln|raw",
00137 .format = AST_FORMAT_SLINEAR,
00138 .write = slinear_write,
00139 .seek = slinear_seek,
00140 .trunc = slinear_trunc,
00141 .tell = slinear_tell,
00142 .read = slinear_read,
00143 .buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET,
00144 };
00145
00146 static int load_module(void)
00147 {
00148 if (ast_format_register(&slin_f))
00149 return AST_MODULE_LOAD_FAILURE;
00150 return AST_MODULE_LOAD_SUCCESS;
00151 }
00152
00153 static int unload_module(void)
00154 {
00155 return ast_format_unregister(slin_f.name);
00156 }
00157
00158 AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "Raw Signed Linear Audio support (SLN)",
00159 .load = load_module,
00160 .unload = unload_module,
00161 .load_pri = AST_MODPRI_APP_DEPEND
00162 );