RAW SLINEAR 16 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 640 |
#define | SLIN_SAMPLES 320 |
Functions | |
AST_MODULE_INFO (ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER,"Raw Signed Linear 16KHz Audio support (SLN16)",.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 16 Format.
Definition in file format_sln16.c.
#define BUF_SIZE 640 |
Definition at line 38 of file format_sln16.c.
#define SLIN_SAMPLES 320 |
Definition at line 39 of file format_sln16.c.
AST_MODULE_INFO | ( | ASTERISK_GPL_KEY | , | |
AST_MODFLAG_LOAD_ORDER | , | |||
"Raw Signed Linear 16KHz Audio support (SLN16)" | , | |||
. | load = load_module , |
|||
. | unload = unload_module , |
|||
. | load_pri = AST_MODPRI_APP_DEPEND | |||
) |
static int load_module | ( | void | ) | [static] |
Definition at line 150 of file format_sln16.c.
References ast_format_register, AST_MODULE_LOAD_FAILURE, and AST_MODULE_LOAD_SUCCESS.
00151 { 00152 if (ast_format_register(&slin_f)) 00153 return AST_MODULE_LOAD_FAILURE; 00154 00155 return AST_MODULE_LOAD_SUCCESS; 00156 }
static struct ast_frame* slinear_read | ( | struct ast_filestream * | s, | |
int * | whennext | |||
) | [static, read] |
Definition at line 41 of file format_sln16.c.
References AST_FORMAT_SLINEAR16, 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.
00042 { 00043 int res; 00044 /* Send a frame from the file to the appropriate channel */ 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 }
static int slinear_seek | ( | struct ast_filestream * | fs, | |
off_t | sample_offset, | |||
int | whence | |||
) | [static] |
Definition at line 79 of file format_sln16.c.
References ast_log(), AST_LOG_WARNING, errno, ast_filestream::f, ast_frame::offset, and SEEK_FORCECUR.
00080 { 00081 off_t offset = 0, min = 0, cur, max; 00082 00083 sample_offset <<= 1; 00084 00085 if ((cur = ftello(fs->f)) < 0) { 00086 ast_log(AST_LOG_WARNING, "Unable to determine current position in sln16 filestream %p: %s\n", fs, strerror(errno)); 00087 return -1; 00088 } 00089 00090 if (fseeko(fs->f, 0, SEEK_END) < 0) { 00091 ast_log(AST_LOG_WARNING, "Unable to seek to end of sln16 filestream %p: %s\n", fs, strerror(errno)); 00092 return -1; 00093 } 00094 00095 if ((max = ftello(fs->f)) < 0) { 00096 ast_log(AST_LOG_WARNING, "Unable to determine max position in sln16 filestream %p: %s\n", fs, strerror(errno)); 00097 return -1; 00098 } 00099 00100 if (whence == SEEK_SET) 00101 offset = sample_offset; 00102 else if (whence == SEEK_CUR || whence == SEEK_FORCECUR) 00103 offset = sample_offset + cur; 00104 else if (whence == SEEK_END) 00105 offset = max - sample_offset; 00106 00107 if (whence != SEEK_FORCECUR) 00108 offset = (offset > max) ? max : offset; 00109 00110 /* always protect against seeking past begining. */ 00111 offset = (offset < min) ? min : offset; 00112 00113 return fseeko(fs->f, offset, SEEK_SET); 00114 }
static off_t slinear_tell | ( | struct ast_filestream * | fs | ) | [static] |
Definition at line 133 of file format_sln16.c.
References ast_filestream::f.
00134 { 00135 return ftello(fs->f) / 2; 00136 }
static int slinear_trunc | ( | struct ast_filestream * | fs | ) | [static] |
Definition at line 116 of file format_sln16.c.
References ast_log(), AST_LOG_WARNING, errno, and ast_filestream::f.
00117 { 00118 int fd; 00119 off_t cur; 00120 00121 if ((fd = fileno(fs->f)) < 0) { 00122 ast_log(AST_LOG_WARNING, "Unable to determine file descriptor for sln16 filestream %p: %s\n", fs, strerror(errno)); 00123 return -1; 00124 } 00125 if ((cur = ftello(fs->f)) < 0) { 00126 ast_log(AST_LOG_WARNING, "Unable to determine current position in sln16 filestream %p: %s\n", fs, strerror(errno)); 00127 return -1; 00128 } 00129 /* Truncate file to current length */ 00130 return ftruncate(fd, cur); 00131 }
static int slinear_write | ( | struct ast_filestream * | fs, | |
struct ast_frame * | f | |||
) | [static] |
Definition at line 60 of file format_sln16.c.
References AST_FORMAT_SLINEAR16, 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.
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 }
static int unload_module | ( | void | ) | [static] |
Definition at line 158 of file format_sln16.c.
References ast_format_unregister(), and ast_format::name.
00159 { 00160 return ast_format_unregister(slin_f.name); 00161 }
struct ast_format slin_f [static] |
Definition at line 138 of file format_sln16.c.