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https://github.com/asterisk/asterisk.git
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Largely simplify format handlers (for file copy etc.)
collecting common functions in a single place and removing them from the individual handlers. The full description is on mantis, http://bugs.digium.com/view.php?id=6375 and only the ogg_vorbis handler needs to be converted to the new structure. As a result of this change, format_au.c and format_pcm_alaw.c should go away (in a separate commit) as their functionality (trivial) has been merged in another file. git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@17243 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Luigi Rizzo
@@ -45,135 +45,67 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
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#include "asterisk/module.h"
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#include "asterisk/endian.h"
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#include "asterisk/ulaw.h"
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#include "asterisk/alaw.h"
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#define BUF_SIZE 160 /* 160 samples */
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struct ast_filestream {
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void *reserved[AST_RESERVED_POINTERS];
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/* This is what a filestream means to us */
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FILE *f; /* Descriptor */
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struct ast_channel *owner;
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struct ast_frame fr; /* Frame information */
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char waste[AST_FRIENDLY_OFFSET]; /* Buffer for sending frames, etc */
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char empty; /* Empty character */
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unsigned char buf[BUF_SIZE]; /* Output Buffer */
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struct timeval last;
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};
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AST_MUTEX_DEFINE_STATIC(pcm_lock);
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static int glistcnt = 0;
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static char *name = "pcm";
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static char *desc = "Raw uLaw 8khz Audio support (PCM)";
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static char *exts = "pcm|ulaw|ul|mu";
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#define BUF_SIZE 160 /* 160 bytes, and same number of samples */
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static char ulaw_silence[BUF_SIZE];
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static char alaw_silence[BUF_SIZE];
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static struct ast_filestream *pcm_open(FILE *f)
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/* #define REALTIME_WRITE */ /* XXX does it work at all ? */
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#ifdef REALTIME_WRITE
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struct pcm_desc {
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unsigned long start_time;
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};
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/* Returns time in msec since system boot. */
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static unsigned long get_time(void)
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{
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/* We don't have any header to read or anything really, but
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if we did, it would go here. We also might want to check
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and be sure it's a valid file. */
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struct ast_filestream *tmp;
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if ((tmp = malloc(sizeof(struct ast_filestream)))) {
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memset(tmp, 0, sizeof(struct ast_filestream));
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if (ast_mutex_lock(&pcm_lock)) {
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ast_log(LOG_WARNING, "Unable to lock pcm list\n");
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free(tmp);
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return NULL;
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}
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tmp->f = f;
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tmp->fr.data = tmp->buf;
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tmp->fr.frametype = AST_FRAME_VOICE;
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tmp->fr.subclass = AST_FORMAT_ULAW;
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/* datalen will vary for each frame */
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tmp->fr.src = name;
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tmp->fr.mallocd = 0;
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glistcnt++;
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ast_mutex_unlock(&pcm_lock);
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ast_update_use_count();
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struct tms buf;
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clock_t cur;
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cur = times( &buf );
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if( cur < 0 ) {
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ast_log( LOG_WARNING, "Cannot get current time\n" );
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return 0;
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}
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return tmp;
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return cur * 1000 / sysconf( _SC_CLK_TCK );
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}
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static struct ast_filestream *pcm_rewrite(FILE *f, const char *comment)
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static int pcma_open(struct ast_filestream *s)
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{
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/* We don't have any header to read or anything really, but
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if we did, it would go here. We also might want to check
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and be sure it's a valid file. */
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struct ast_filestream *tmp;
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if ((tmp = malloc(sizeof(struct ast_filestream)))) {
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memset(tmp, 0, sizeof(struct ast_filestream));
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if (ast_mutex_lock(&pcm_lock)) {
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ast_log(LOG_WARNING, "Unable to lock pcm list\n");
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free(tmp);
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return NULL;
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}
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tmp->f = f;
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glistcnt++;
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ast_mutex_unlock(&pcm_lock);
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ast_update_use_count();
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} else
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ast_log(LOG_WARNING, "Out of memory\n");
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return tmp;
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if (s->fmt->format == AST_FORMAT_ALAW)
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pd->starttime = get_time();
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return 0;
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}
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static void pcm_close(struct ast_filestream *s)
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static int pcma_rewrite(struct ast_filestream *s, const char *comment)
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{
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if (ast_mutex_lock(&pcm_lock)) {
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ast_log(LOG_WARNING, "Unable to lock pcm list\n");
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return;
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}
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glistcnt--;
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ast_mutex_unlock(&pcm_lock);
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ast_update_use_count();
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fclose(s->f);
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free(s);
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s = NULL;
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return pcma_open(s);
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}
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#endif
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static struct ast_frame *pcm_read(struct ast_filestream *s, int *whennext)
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{
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int res;
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int delay;
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/* Send a frame from the file to the appropriate channel */
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s->fr.frametype = AST_FRAME_VOICE;
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s->fr.subclass = AST_FORMAT_ULAW;
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s->fr.offset = AST_FRIENDLY_OFFSET;
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s->fr.subclass = s->fmt->format;
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s->fr.mallocd = 0;
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s->fr.data = s->buf;
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if ((res = fread(s->buf, 1, BUF_SIZE, s->f)) < 1) {
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FR_SET_BUF(&s->fr, s->buf, AST_FRIENDLY_OFFSET, BUF_SIZE);
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if ((res = fread(s->fr.data, 1, s->fr.datalen, s->f)) < 1) {
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if (res)
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ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
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return NULL;
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}
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s->fr.samples = res;
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s->fr.datalen = res;
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delay = s->fr.samples;
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*whennext = delay;
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*whennext = s->fr.samples = res;
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return &s->fr;
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}
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static int pcm_write(struct ast_filestream *fs, struct ast_frame *f)
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{
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int res;
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if (f->frametype != AST_FRAME_VOICE) {
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ast_log(LOG_WARNING, "Asked to write non-voice frame!\n");
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return -1;
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}
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if (f->subclass != AST_FORMAT_ULAW) {
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ast_log(LOG_WARNING, "Asked to write non-ulaw frame (%d)!\n", f->subclass);
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return -1;
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}
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if ((res = fwrite(f->data, 1, f->datalen, fs->f)) != f->datalen) {
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ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n", res, f->datalen, strerror(errno));
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return -1;
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}
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return 0;
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}
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static int pcm_seek(struct ast_filestream *fs, off_t sample_offset, int whence)
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{
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off_t cur, max, offset = 0;
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@@ -204,13 +136,13 @@ static int pcm_seek(struct ast_filestream *fs, off_t sample_offset, int whence)
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}
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if (whence == SEEK_FORCECUR && offset > max) { /* extend the file */
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size_t left = offset - max;
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const char *src = (fs->fmt->format == AST_FORMAT_ALAW) ? alaw_silence : ulaw_silence;
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while (left) {
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size_t written = fwrite(ulaw_silence, sizeof(ulaw_silence[0]),
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(left > BUF_SIZE) ? BUF_SIZE : left, fs->f);
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size_t written = fwrite(src, 1, (left > BUF_SIZE) ? BUF_SIZE : left, fs->f);
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if (written == -1)
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break; /* error */
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left -= written * sizeof(ulaw_silence[0]);
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left -= written;
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}
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ret = 0; /* successful */
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} else {
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@@ -230,51 +162,336 @@ static int pcm_trunc(struct ast_filestream *fs)
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static off_t pcm_tell(struct ast_filestream *fs)
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{
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off_t offset;
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offset = ftello(fs->f);
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return offset;
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return ftello(fs->f);
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}
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static char *pcm_getcomment(struct ast_filestream *s)
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static int pcm_write(struct ast_filestream *fs, struct ast_frame *f)
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{
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return NULL;
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int res;
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if (f->frametype != AST_FRAME_VOICE) {
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ast_log(LOG_WARNING, "Asked to write non-voice frame!\n");
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return -1;
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}
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if (f->subclass != fs->fmt->format) {
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ast_log(LOG_WARNING, "Asked to write incompatible format frame (%d)!\n", f->subclass);
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return -1;
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}
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#ifdef REALTIME_WRITE
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if (s->fmt->format == AST_FORMAT_ALAW) {
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struct pcm_desc *pd = (struct pcm_desc *)fs->private;
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struct stat stat_buf;
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unsigned long cur_time = get_time();
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unsigned long fpos = ( cur_time - pd->start_time ) * 8; /* 8 bytes per msec */
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/* Check if we have written to this position yet. If we have, then increment pos by one frame
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* for some degree of protection against receiving packets in the same clock tick.
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*/
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fstat(fileno(fs->f), &stat_buf );
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if (stat_buf.st_size > fpos )
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fpos += f->datalen; /* Incrementing with the size of this current frame */
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if (stat_buf.st_size < fpos) {
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/* fill the gap with 0x55 rather than 0. */
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char buf[1024];
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unsigned long cur, to_write;
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cur = stat_buf.st_size;
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if (fseek(fs->f, cur, SEEK_SET) < 0) {
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ast_log( LOG_WARNING, "Cannot seek in file: %s\n", strerror(errno) );
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return -1;
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}
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memset(buf, 0x55, 512);
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while (cur < fpos) {
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to_write = fpos - cur;
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if (to_write > sizeof(buf))
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to_write = sizeof(buf);
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fwrite(buf, 1, to_write, fs->f);
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cur += to_write;
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}
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}
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if (fseek(s->f, fpos, SEEK_SET) < 0) {
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ast_log( LOG_WARNING, "Cannot seek in file: %s\n", strerror(errno) );
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return -1;
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}
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}
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#endif /* REALTIME_WRITE */
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if ((res = fwrite(f->data, 1, f->datalen, fs->f)) != f->datalen) {
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ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n", res, f->datalen, strerror(errno));
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return -1;
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}
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return 0;
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}
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/* SUN .au support routines */
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#define AU_HEADER_SIZE 24
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#define AU_HEADER(var) u_int32_t var[6]
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#define AU_HDR_MAGIC_OFF 0
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#define AU_HDR_HDR_SIZE_OFF 1
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#define AU_HDR_DATA_SIZE_OFF 2
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#define AU_HDR_ENCODING_OFF 3
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#define AU_HDR_SAMPLE_RATE_OFF 4
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#define AU_HDR_CHANNELS_OFF 5
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#define AU_ENC_8BIT_ULAW 1
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#define AU_MAGIC 0x2e736e64
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#if __BYTE_ORDER == __BIG_ENDIAN
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#define htoll(b) (b)
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#define htols(b) (b)
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#define ltohl(b) (b)
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#define ltohs(b) (b)
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#else
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#if __BYTE_ORDER == __LITTLE_ENDIAN
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#define htoll(b) \
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(((((b) ) & 0xFF) << 24) | \
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((((b) >> 8) & 0xFF) << 16) | \
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((((b) >> 16) & 0xFF) << 8) | \
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((((b) >> 24) & 0xFF) ))
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#define htols(b) \
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(((((b) ) & 0xFF) << 8) | \
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((((b) >> 8) & 0xFF) ))
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#define ltohl(b) htoll(b)
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#define ltohs(b) htols(b)
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#else
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#error "Endianess not defined"
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#endif
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#endif
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static int check_header(FILE *f)
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{
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AU_HEADER(header);
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u_int32_t magic;
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u_int32_t hdr_size;
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u_int32_t data_size;
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u_int32_t encoding;
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u_int32_t sample_rate;
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u_int32_t channels;
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if (fread(header, 1, AU_HEADER_SIZE, f) != AU_HEADER_SIZE) {
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ast_log(LOG_WARNING, "Read failed (header)\n");
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return -1;
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}
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magic = ltohl(header[AU_HDR_MAGIC_OFF]);
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if (magic != (u_int32_t) AU_MAGIC) {
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ast_log(LOG_WARNING, "Bad magic: 0x%x\n", magic);
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}
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/* hdr_size = ltohl(header[AU_HDR_HDR_SIZE_OFF]);
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if (hdr_size < AU_HEADER_SIZE)*/
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hdr_size = AU_HEADER_SIZE;
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/* data_size = ltohl(header[AU_HDR_DATA_SIZE_OFF]); */
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encoding = ltohl(header[AU_HDR_ENCODING_OFF]);
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if (encoding != AU_ENC_8BIT_ULAW) {
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ast_log(LOG_WARNING, "Unexpected format: %d. Only 8bit ULAW allowed (%d)\n", encoding, AU_ENC_8BIT_ULAW);
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return -1;
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}
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sample_rate = ltohl(header[AU_HDR_SAMPLE_RATE_OFF]);
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if (sample_rate != DEFAULT_SAMPLE_RATE) {
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ast_log(LOG_WARNING, "Sample rate can only be 8000 not %d\n", sample_rate);
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return -1;
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}
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channels = ltohl(header[AU_HDR_CHANNELS_OFF]);
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if (channels != 1) {
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ast_log(LOG_WARNING, "Not in mono: channels=%d\n", channels);
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return -1;
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}
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/* Skip to data */
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fseek(f, 0, SEEK_END);
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data_size = ftell(f) - hdr_size;
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if (fseek(f, hdr_size, SEEK_SET) == -1 ) {
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ast_log(LOG_WARNING, "Failed to skip to data: %d\n", hdr_size);
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return -1;
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}
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return data_size;
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}
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static int update_header(FILE *f)
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{
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off_t cur, end;
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u_int32_t datalen;
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int bytes;
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cur = ftell(f);
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fseek(f, 0, SEEK_END);
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end = ftell(f);
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/* data starts 24 bytes in */
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bytes = end - AU_HEADER_SIZE;
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datalen = htoll(bytes);
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if (cur < 0) {
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ast_log(LOG_WARNING, "Unable to find our position\n");
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return -1;
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}
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if (fseek(f, AU_HDR_DATA_SIZE_OFF * sizeof(u_int32_t), SEEK_SET)) {
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ast_log(LOG_WARNING, "Unable to set our position\n");
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return -1;
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}
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if (fwrite(&datalen, 1, sizeof(datalen), f) != sizeof(datalen)) {
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ast_log(LOG_WARNING, "Unable to set write file size\n");
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return -1;
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}
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if (fseek(f, cur, SEEK_SET)) {
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ast_log(LOG_WARNING, "Unable to return to position\n");
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return -1;
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}
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return 0;
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}
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static int write_header(FILE *f)
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{
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AU_HEADER(header);
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header[AU_HDR_MAGIC_OFF] = htoll((u_int32_t) AU_MAGIC);
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header[AU_HDR_HDR_SIZE_OFF] = htoll(AU_HEADER_SIZE);
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header[AU_HDR_DATA_SIZE_OFF] = 0;
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header[AU_HDR_ENCODING_OFF] = htoll(AU_ENC_8BIT_ULAW);
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header[AU_HDR_SAMPLE_RATE_OFF] = htoll(DEFAULT_SAMPLE_RATE);
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header[AU_HDR_CHANNELS_OFF] = htoll(1);
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/* Write an au header, ignoring sizes which will be filled in later */
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fseek(f, 0, SEEK_SET);
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if (fwrite(header, 1, AU_HEADER_SIZE, f) != AU_HEADER_SIZE) {
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ast_log(LOG_WARNING, "Unable to write header\n");
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return -1;
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}
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return 0;
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}
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static int au_open(struct ast_filestream *s)
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{
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if (check_header(s->f) < 0)
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return -1;
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return 0;
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}
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static int au_rewrite(struct ast_filestream *s, const char *comment)
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{
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if (write_header(s->f))
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return -1;
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return 0;
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}
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||||
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/* XXX check this, probably incorrect */
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static int au_seek(struct ast_filestream *fs, off_t sample_offset, int whence)
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{
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off_t min, max, cur;
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long offset = 0, samples;
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samples = sample_offset;
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min = AU_HEADER_SIZE;
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cur = ftello(fs->f);
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fseek(fs->f, 0, SEEK_END);
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max = ftello(fs->f);
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if (whence == SEEK_SET)
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offset = samples + min;
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else if (whence == SEEK_CUR || whence == SEEK_FORCECUR)
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offset = samples + cur;
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else if (whence == SEEK_END)
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offset = max - samples;
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if (whence != SEEK_FORCECUR) {
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||||
offset = (offset > max) ? max : offset;
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}
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/* always protect the header space. */
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||||
offset = (offset < min) ? min : offset;
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return fseeko(fs->f, offset, SEEK_SET);
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}
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static int au_trunc(struct ast_filestream *fs)
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{
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if (ftruncate(fileno(fs->f), ftell(fs->f)))
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return -1;
|
||||
return update_header(fs->f);
|
||||
}
|
||||
|
||||
static off_t au_tell(struct ast_filestream *fs)
|
||||
{
|
||||
off_t offset = ftello(fs->f);
|
||||
return offset - AU_HEADER_SIZE;
|
||||
}
|
||||
|
||||
static struct ast_format_lock me = { .usecnt = -1 };
|
||||
|
||||
static const struct ast_format alaw_f = {
|
||||
.name = "alaw",
|
||||
.exts = "alaw|al",
|
||||
.format = AST_FORMAT_ALAW,
|
||||
.write = pcm_write,
|
||||
.seek = pcm_seek,
|
||||
.trunc = pcm_trunc,
|
||||
.tell = pcm_tell,
|
||||
.read = pcm_read,
|
||||
.buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET,
|
||||
.lockp = &me,
|
||||
#ifdef REALTIME_WRITE
|
||||
.open = pcma_open,
|
||||
.rewrite = pcma_rewrite,
|
||||
.desc_size = sizeof(struct pcm_desc),
|
||||
#endif
|
||||
};
|
||||
|
||||
static const struct ast_format pcm_f = {
|
||||
.name = "pcm",
|
||||
.exts = "pcm|ulaw|ul|mu",
|
||||
.format = AST_FORMAT_ULAW,
|
||||
.write = pcm_write,
|
||||
.seek = pcm_seek,
|
||||
.trunc = pcm_trunc,
|
||||
.tell = pcm_tell,
|
||||
.read = pcm_read,
|
||||
.buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET,
|
||||
.lockp = &me,
|
||||
};
|
||||
|
||||
static const struct ast_format au_f = {
|
||||
.name = "au",
|
||||
.exts = "au",
|
||||
.format = AST_FORMAT_ULAW,
|
||||
.open = au_open,
|
||||
.rewrite = au_rewrite,
|
||||
.write = pcm_write,
|
||||
.seek = au_seek,
|
||||
.trunc = au_trunc,
|
||||
.tell = au_tell,
|
||||
.read = pcm_read,
|
||||
.buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET, /* this many shorts */
|
||||
.lockp = &me,
|
||||
};
|
||||
|
||||
int load_module()
|
||||
{
|
||||
int index;
|
||||
|
||||
/* XXX better init ? */
|
||||
for (index = 0; index < (sizeof(ulaw_silence) / sizeof(ulaw_silence[0])); index++)
|
||||
ulaw_silence[index] = AST_LIN2MU(0);
|
||||
for (index = 0; index < (sizeof(alaw_silence) / sizeof(alaw_silence[0])); index++)
|
||||
alaw_silence[index] = AST_LIN2A(0);
|
||||
|
||||
return ast_format_register(name, exts, AST_FORMAT_ULAW,
|
||||
pcm_open,
|
||||
pcm_rewrite,
|
||||
pcm_write,
|
||||
pcm_seek,
|
||||
pcm_trunc,
|
||||
pcm_tell,
|
||||
pcm_read,
|
||||
pcm_close,
|
||||
pcm_getcomment);
|
||||
return ast_format_register(&pcm_f) || ast_format_register(&alaw_f)
|
||||
|| ast_format_register(&au_f);
|
||||
}
|
||||
|
||||
int unload_module()
|
||||
{
|
||||
return ast_format_unregister(name);
|
||||
return ast_format_unregister(pcm_f.name) || ast_format_unregister(alaw_f.name)
|
||||
|| ast_format_unregister(au_f.name);
|
||||
}
|
||||
|
||||
int usecount()
|
||||
{
|
||||
return glistcnt;
|
||||
return me.usecnt;
|
||||
}
|
||||
|
||||
char *description()
|
||||
{
|
||||
return desc;
|
||||
return "Raw/Sun uLaw/ALaw 8khz Audio support (PCM,PCMA,AU)";
|
||||
}
|
||||
|
||||
|
||||
char *key()
|
||||
{
|
||||
return ASTERISK_GPL_KEY;
|
||||
|
||||
Reference in New Issue
Block a user