diff options
Diffstat (limited to 'formats/format_gsm.c')
-rw-r--r-- | formats/format_gsm.c | 151 |
1 files changed, 34 insertions, 117 deletions
diff --git a/formats/format_gsm.c b/formats/format_gsm.c index c6ef31f7e..3a27a11fb 100644 --- a/formats/format_gsm.c +++ b/formats/format_gsm.c @@ -50,6 +50,9 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$") /* Portions of the conversion code are by guido@sienanet.it */ +#define GSM_FRAME_SIZE 33 +#define GSM_SAMPLES 160 + /* silent gsm frame */ /* begin binary data: */ char gsm_silence[] = /* 33 */ @@ -58,111 +61,28 @@ char gsm_silence[] = /* 33 */ ,0x92,0x49,0x24}; /* end binary data. size = 33 bytes */ -struct ast_filestream { - void *reserved[AST_RESERVED_POINTERS]; - /* Believe it or not, we must decode/recode to account for the - weird MS format */ - /* This is what a filestream means to us */ - FILE *f; /* Descriptor */ - struct ast_frame fr; /* Frame information */ - char waste[AST_FRIENDLY_OFFSET]; /* Buffer for sending frames, etc */ - char empty; /* Empty character */ - unsigned char gsm[66]; /* Two Real GSM Frames */ -}; - - -AST_MUTEX_DEFINE_STATIC(gsm_lock); -static int glistcnt = 0; - -static char *name = "gsm"; -static char *desc = "Raw GSM data"; -static char *exts = "gsm"; - -static struct ast_filestream *gsm_open(FILE *f) -{ - /* We don't have any header to read or anything really, but - if we did, it would go here. We also might want to check - and be sure it's a valid file. */ - struct ast_filestream *tmp; - if ((tmp = malloc(sizeof(struct ast_filestream)))) { - memset(tmp, 0, sizeof(struct ast_filestream)); - if (ast_mutex_lock(&gsm_lock)) { - ast_log(LOG_WARNING, "Unable to lock gsm list\n"); - free(tmp); - return NULL; - } - tmp->f = f; - tmp->fr.data = tmp->gsm; - tmp->fr.frametype = AST_FRAME_VOICE; - tmp->fr.subclass = AST_FORMAT_GSM; - /* datalen will vary for each frame */ - tmp->fr.src = name; - tmp->fr.mallocd = 0; - glistcnt++; - ast_mutex_unlock(&gsm_lock); - ast_update_use_count(); - } - return tmp; -} - -static struct ast_filestream *gsm_rewrite(FILE *f, const char *comment) -{ - /* We don't have any header to read or anything really, but - if we did, it would go here. We also might want to check - and be sure it's a valid file. */ - struct ast_filestream *tmp; - if ((tmp = malloc(sizeof(struct ast_filestream)))) { - memset(tmp, 0, sizeof(struct ast_filestream)); - if (ast_mutex_lock(&gsm_lock)) { - ast_log(LOG_WARNING, "Unable to lock gsm list\n"); - free(tmp); - return NULL; - } - tmp->f = f; - glistcnt++; - ast_mutex_unlock(&gsm_lock); - ast_update_use_count(); - } else - ast_log(LOG_WARNING, "Out of memory\n"); - return tmp; -} - -static void gsm_close(struct ast_filestream *s) -{ - if (ast_mutex_lock(&gsm_lock)) { - ast_log(LOG_WARNING, "Unable to lock gsm list\n"); - return; - } - glistcnt--; - ast_mutex_unlock(&gsm_lock); - ast_update_use_count(); - fclose(s->f); - free(s); -} - static struct ast_frame *gsm_read(struct ast_filestream *s, int *whennext) { int res; + s->fr.frametype = AST_FRAME_VOICE; s->fr.subclass = AST_FORMAT_GSM; - s->fr.offset = AST_FRIENDLY_OFFSET; - s->fr.samples = 160; - s->fr.datalen = 33; + FR_SET_BUF(&(s->fr), s->buf, AST_FRIENDLY_OFFSET, GSM_FRAME_SIZE) s->fr.mallocd = 0; - s->fr.data = s->gsm; - if ((res = fread(s->gsm, 1, 33, s->f)) != 33) { + if ((res = fread(s->fr.data, 1, GSM_FRAME_SIZE, s->f)) != GSM_FRAME_SIZE) { if (res) ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno)); return NULL; } - *whennext = 160; + *whennext = s->fr.samples = GSM_SAMPLES; return &s->fr; } static int gsm_write(struct ast_filestream *fs, struct ast_frame *f) { int res; - unsigned char gsm[66]; + unsigned char gsm[2*GSM_FRAME_SIZE]; + if (f->frametype != AST_FRAME_VOICE) { ast_log(LOG_WARNING, "Asked to write non-voice frame!\n"); return -1; @@ -176,14 +96,14 @@ static int gsm_write(struct ast_filestream *fs, struct ast_frame *f) int len=0; while(len < f->datalen) { conv65(f->data + len, gsm); - if ((res = fwrite(gsm, 1, 66, fs->f)) != 66) { + if ((res = fwrite(gsm, 1, 2*GSM_FRAME_SIZE, fs->f)) != 2*GSM_FRAME_SIZE) { ast_log(LOG_WARNING, "Bad write (%d/66): %s\n", res, strerror(errno)); return -1; } len += 65; } } else { - if (f->datalen % 33) { + if (f->datalen % GSM_FRAME_SIZE) { ast_log(LOG_WARNING, "Invalid data length, %d, should be multiple of 33\n", f->datalen); return -1; } @@ -204,7 +124,7 @@ static int gsm_seek(struct ast_filestream *fs, off_t sample_offset, int whence) fseeko(fs->f, 0, SEEK_END); max = ftello(fs->f); /* have to fudge to frame here, so not fully to sample */ - distance = (sample_offset/160) * 33; + distance = (sample_offset/GSM_SAMPLES) * GSM_FRAME_SIZE; if(whence == SEEK_SET) offset = distance; else if(whence == SEEK_CUR || whence == SEEK_FORCECUR) @@ -218,8 +138,8 @@ static int gsm_seek(struct ast_filestream *fs, off_t sample_offset, int whence) } else if (offset > max) { int i; fseeko(fs->f, 0, SEEK_END); - for (i=0; i< (offset - max) / 33; i++) { - fwrite(gsm_silence, 1, 33, fs->f); + for (i=0; i< (offset - max) / GSM_FRAME_SIZE; i++) { + fwrite(gsm_silence, 1, GSM_FRAME_SIZE, fs->f); } } return fseeko(fs->f, offset, SEEK_SET); @@ -232,48 +152,45 @@ static int gsm_trunc(struct ast_filestream *fs) static off_t gsm_tell(struct ast_filestream *fs) { - off_t offset; - offset = ftello(fs->f); - return (offset/33)*160; + off_t offset = ftello(fs->f); + return (offset/GSM_FRAME_SIZE)*GSM_SAMPLES; } -static char *gsm_getcomment(struct ast_filestream *s) -{ - return NULL; -} +static struct ast_format_lock me = { .usecnt = -1 }; + +static const struct ast_format gsm_f = { + .name = "gsm", + .exts = "gsm", + .format = AST_FORMAT_GSM, + .write = gsm_write, + .seek = gsm_seek, + .trunc = gsm_trunc, + .tell = gsm_tell, + .read = gsm_read, + .buf_size = 2*GSM_FRAME_SIZE + AST_FRIENDLY_OFFSET, /* 2 gsm frames */ + .lockp = &me, +}; int load_module() { - return ast_format_register(name, exts, AST_FORMAT_GSM, - gsm_open, - gsm_rewrite, - gsm_write, - gsm_seek, - gsm_trunc, - gsm_tell, - gsm_read, - gsm_close, - gsm_getcomment); - - + return ast_format_register(&gsm_f); } int unload_module() { - return ast_format_unregister(name); + return ast_format_unregister(gsm_f.name); } int usecount() { - return glistcnt; + return me.usecnt; } char *description() { - return desc; + return "Raw GSM data"; } - char *key() { return ASTERISK_GPL_KEY; |