RAW SLINEAR Format. More...
#include "asterisk.h"
#include "asterisk/mod_format.h"
#include "asterisk/module.h"
#include "asterisk/endian.h"
Go to the source code of this file.
Defines | |
#define | BUF_SIZE 320 |
#define | SLIN_SAMPLES 160 |
Functions | |
AST_MODULE_INFO (ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER,"Raw Signed Linear Audio support (SLN)",.load=load_module,.unload=unload_module,.load_pri=AST_MODPRI_APP_DEPEND) | |
static int | load_module (void) |
static struct ast_frame * | slinear_read (struct ast_filestream *s, int *whennext) |
static int | slinear_seek (struct ast_filestream *fs, off_t sample_offset, int whence) |
static off_t | slinear_tell (struct ast_filestream *fs) |
static int | slinear_trunc (struct ast_filestream *fs) |
static int | slinear_write (struct ast_filestream *fs, struct ast_frame *f) |
static int | unload_module (void) |
Variables | |
static struct ast_format | slin_f |
RAW SLINEAR Format.
Definition in file format_sln.c.
#define BUF_SIZE 320 |
Definition at line 37 of file format_sln.c.
#define SLIN_SAMPLES 160 |
Definition at line 38 of file format_sln.c.
AST_MODULE_INFO | ( | ASTERISK_GPL_KEY | , | |
AST_MODFLAG_LOAD_ORDER | , | |||
"Raw Signed Linear Audio support (SLN)" | , | |||
. | load = load_module , |
|||
. | unload = unload_module , |
|||
. | load_pri = AST_MODPRI_APP_DEPEND | |||
) |
static int load_module | ( | void | ) | [static] |
Definition at line 146 of file format_sln.c.
References ast_format_register, AST_MODULE_LOAD_FAILURE, and AST_MODULE_LOAD_SUCCESS.
00147 { 00148 if (ast_format_register(&slin_f)) 00149 return AST_MODULE_LOAD_FAILURE; 00150 return AST_MODULE_LOAD_SUCCESS; 00151 }
static struct ast_frame* slinear_read | ( | struct ast_filestream * | s, | |
int * | whennext | |||
) | [static, read] |
Definition at line 40 of file format_sln.c.
References AST_FORMAT_SLINEAR, AST_FRAME_SET_BUFFER, AST_FRAME_VOICE, AST_FRIENDLY_OFFSET, ast_log(), ast_filestream::buf, BUF_SIZE, ast_frame_subclass::codec, ast_frame::data, ast_frame::datalen, errno, ast_filestream::f, ast_filestream::fr, ast_frame::frametype, LOG_WARNING, ast_frame::mallocd, ast_frame::ptr, ast_frame::samples, and ast_frame::subclass.
00041 { 00042 int res; 00043 /* Send a frame from the file to the appropriate channel */ 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 }
static int slinear_seek | ( | struct ast_filestream * | fs, | |
off_t | sample_offset, | |||
int | whence | |||
) | [static] |
Definition at line 77 of file format_sln.c.
References ast_log(), AST_LOG_WARNING, errno, ast_filestream::f, ast_frame::offset, and SEEK_FORCECUR.
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 /* always protect against seeking past begining. */ 00108 offset = (offset < min)?min:offset; 00109 return fseeko(fs->f, offset, SEEK_SET); 00110 }
static off_t slinear_tell | ( | struct ast_filestream * | fs | ) | [static] |
Definition at line 129 of file format_sln.c.
References ast_filestream::f.
00130 { 00131 return ftello(fs->f) / 2; 00132 }
static int slinear_trunc | ( | struct ast_filestream * | fs | ) | [static] |
Definition at line 112 of file format_sln.c.
References ast_log(), AST_LOG_WARNING, errno, and ast_filestream::f.
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 /* Truncate file to current length */ 00126 return ftruncate(fd, cur); 00127 }
static int slinear_write | ( | struct ast_filestream * | fs, | |
struct ast_frame * | f | |||
) | [static] |
Definition at line 59 of file format_sln.c.
References AST_FORMAT_SLINEAR, AST_FRAME_VOICE, ast_getformatname(), ast_log(), ast_frame_subclass::codec, ast_frame::data, ast_frame::datalen, errno, ast_filestream::f, ast_frame::frametype, LOG_WARNING, ast_frame::ptr, and ast_frame::subclass.
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 }
static int unload_module | ( | void | ) | [static] |
Definition at line 153 of file format_sln.c.
References ast_format_unregister(), and ast_format::name.
00154 { 00155 return ast_format_unregister(slin_f.name); 00156 }
struct ast_format slin_f [static] |
Definition at line 134 of file format_sln.c.