add support for Sun Microsystems AU audio format (bug #4428 with minor mods)

remove hardcoded format list from app_record help text


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@5837 65c4cc65-6c06-0410-ace0-fbb531ad65f3

formats/format_au.c

@@ -0,0 +1,377 @@
+/*
+ * Asterisk -- A telephony toolkit for Linux.
+ *
+ * Work with Sun Microsystems AU format.
+ * 
+ * Copyright (C) 2005, Andriy Pylypenko
+ * Code based on format_wav.c by Mark Spencer
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License
+ */
+ 
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <stdlib.h>
+#include <sys/time.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#ifdef __linux__
+#include <endian.h>
+#else
+#include <machine/endian.h>
+#endif
+#include "asterisk/lock.h"
+#include "asterisk/channel.h"
+#include "asterisk/file.h"
+#include "asterisk/logger.h"
+#include "asterisk/sched.h"
+#include "asterisk/module.h"
+
+#define BUF_SIZE		160
+
+#define AU_HEADER_SIZE		24
+#define AU_HEADER(var)		u_int32_t var[6]
+
+#define AU_HDR_MAGIC_OFF	0
+#define AU_HDR_HDR_SIZE_OFF	1
+#define AU_HDR_DATA_SIZE_OFF	2
+#define AU_HDR_ENCODING_OFF	3
+#define AU_HDR_SAMPLE_RATE_OFF	4
+#define AU_HDR_CHANNELS_OFF	5
+
+#define AU_ENC_8BIT_ULAW	1
+
+struct ast_filestream {
+	void *reserved[AST_RESERVED_POINTERS];
+	/* This is what a filestream means to us */
+	int fd; 				/* Descriptor */
+	struct ast_channel *owner;
+	struct ast_frame fr;			/* Frame information */
+	char waste[AST_FRIENDLY_OFFSET];	/* Buffer for sending frames, etc */
+	char empty;				/* Empty character */
+	short buf[BUF_SIZE];
+};
+
+
+AST_MUTEX_DEFINE_STATIC(au_lock);
+static int localusecnt = 0;
+
+static char *name = "au";
+static char *desc = "Sun Microsystems AU format (signed linear)";
+static char *exts = "au";
+
+
+#define AU_MAGIC 0x2e736e64
+#if __BYTE_ORDER == __BIG_ENDIAN
+#define htoll(b) (b)
+#define htols(b) (b)
+#define ltohl(b) (b)
+#define ltohs(b) (b)
+#else
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+#define htoll(b)  \
+          (((((b)      ) & 0xFF) << 24) | \
+	       ((((b) >>  8) & 0xFF) << 16) | \
+		   ((((b) >> 16) & 0xFF) <<  8) | \
+		   ((((b) >> 24) & 0xFF)      ))
+#define htols(b) \
+          (((((b)      ) & 0xFF) << 8) | \
+		   ((((b) >> 8) & 0xFF)      ))
+#define ltohl(b) htoll(b)
+#define ltohs(b) htols(b)
+#else
+#error "Endianess not defined"
+#endif
+#endif
+
+
+static int check_header(int fd)
+{
+	AU_HEADER(header);
+	u_int32_t magic;
+	u_int32_t hdr_size;
+	u_int32_t data_size;
+	u_int32_t encoding;
+	u_int32_t sample_rate;
+	u_int32_t channels;
+
+	if (read(fd, header, AU_HEADER_SIZE) != AU_HEADER_SIZE) {
+		ast_log(LOG_WARNING, "Read failed (header)\n");
+		return -1;
+	}
+	magic = ltohl(header[AU_HDR_MAGIC_OFF]);
+	if (magic != (u_int32_t) AU_MAGIC) {
+		ast_log(LOG_WARNING, "Bad magic: 0x%x\n", magic);
+	}
+/*	hdr_size = ltohl(header[AU_HDR_HDR_SIZE_OFF]);
+	if (hdr_size < AU_HEADER_SIZE)*/
+	hdr_size = AU_HEADER_SIZE;
+/*	data_size = ltohl(header[AU_HDR_DATA_SIZE_OFF]); */
+	encoding = ltohl(header[AU_HDR_ENCODING_OFF]);
+	if (encoding != AU_ENC_8BIT_ULAW) {
+		ast_log(LOG_WARNING, "Unexpected format: %d. Only 8bit ULAW allowed (%d)\n", encoding, AU_ENC_8BIT_ULAW);
+		return -1;
+	}
+	sample_rate = ltohl(header[AU_HDR_SAMPLE_RATE_OFF]);
+	if (sample_rate != 8000) {
+		ast_log(LOG_WARNING, "Sample rate can only be 8000 not %d\n", sample_rate);
+		return -1;
+	}
+	channels = ltohl(header[AU_HDR_CHANNELS_OFF]);
+	if (channels != 1) {
+		ast_log(LOG_WARNING, "Not in mono: channels=%d\n", channels);
+		return -1;
+	}
+	/* Skip to data */
+	data_size = lseek(fd, 0, SEEK_END) - hdr_size;
+	if (lseek(fd, hdr_size, SEEK_SET) == -1 ) {
+		ast_log(LOG_WARNING, "Failed to skip to data: %d\n", hdr_size);
+		return -1;
+	}
+	return data_size;
+}
+
+static int update_header(int fd)
+{
+	off_t cur, end;
+	u_int32_t datalen;
+	int bytes;
+
+	cur = lseek(fd, 0, SEEK_CUR);
+	end = lseek(fd, 0, SEEK_END);
+	/* data starts 24 bytes in */
+	bytes = end - AU_HEADER_SIZE;
+	datalen = htoll(bytes);
+
+	if (cur < 0) {
+		ast_log(LOG_WARNING, "Unable to find our position\n");
+		return -1;
+	}
+	if (lseek(fd, AU_HDR_DATA_SIZE_OFF * sizeof(u_int32_t), SEEK_SET) != (AU_HDR_DATA_SIZE_OFF * sizeof(u_int32_t))) {
+		ast_log(LOG_WARNING, "Unable to set our position\n");
+		return -1;
+	}
+	if (write(fd, &datalen, sizeof(datalen)) != sizeof(datalen)) {
+		ast_log(LOG_WARNING, "Unable to set write file size\n");
+		return -1;
+	}
+	if (lseek(fd, cur, SEEK_SET) != cur) {
+		ast_log(LOG_WARNING, "Unable to return to position\n");
+		return -1;
+	}
+	return 0;
+}
+
+static int write_header(int fd)
+{
+	AU_HEADER(header);
+
+	header[AU_HDR_MAGIC_OFF] = htoll((u_int32_t) AU_MAGIC);
+	header[AU_HDR_HDR_SIZE_OFF] = htoll(AU_HEADER_SIZE);
+	header[AU_HDR_DATA_SIZE_OFF] = 0;
+	header[AU_HDR_ENCODING_OFF] = htoll(AU_ENC_8BIT_ULAW);
+	header[AU_HDR_SAMPLE_RATE_OFF] = htoll(8000);
+	header[AU_HDR_CHANNELS_OFF] = htoll(1);
+
+	/* Write an au header, ignoring sizes which will be filled in later */
+	lseek(fd, 0, SEEK_SET);
+	if (write(fd, header, AU_HEADER_SIZE) != AU_HEADER_SIZE) {
+		ast_log(LOG_WARNING, "Unable to write header\n");
+		return -1;
+	}
+	return 0;
+}
+
+static struct ast_filestream *au_open(int fd)
+{
+	struct ast_filestream *tmp;
+
+	if (!(tmp = malloc(sizeof(struct ast_filestream)))) {
+		ast_log(LOG_WARNING, "Out of memory\n");
+		return NULL;
+	}
+
+	memset(tmp, 0, sizeof(struct ast_filestream));
+	if (check_header(fd) < 0) {
+		free(tmp);
+		return NULL;
+	}
+	if (ast_mutex_lock(&au_lock)) {
+		ast_log(LOG_WARNING, "Unable to lock au count\n");
+		free(tmp);
+		return NULL;
+	}
+	tmp->fd = fd;
+	tmp->fr.data = tmp->buf;
+	tmp->fr.frametype = AST_FRAME_VOICE;
+	tmp->fr.subclass = AST_FORMAT_ULAW;
+	/* datalen will vary for each frame */
+	tmp->fr.src = name;
+	tmp->fr.mallocd = 0;
+	localusecnt++;
+	ast_mutex_unlock(&au_lock);
+	ast_update_use_count();
+	return tmp;
+}
+
+static struct ast_filestream *au_rewrite(int fd, const char *comment)
+{
+	struct ast_filestream *tmp;
+
+	if ((tmp = malloc(sizeof(struct ast_filestream))) == NULL) {
+		ast_log(LOG_WARNING, "Out of memory\n");
+		return NULL;
+	}
+
+	memset(tmp, 0, sizeof(struct ast_filestream));
+	if (write_header(fd)) {
+		free(tmp);
+		return NULL;
+	}
+	if (ast_mutex_lock(&au_lock)) {
+		ast_log(LOG_WARNING, "Unable to lock au count\n");
+		free(tmp);
+		return NULL;
+	}
+	tmp->fd = fd;
+	localusecnt++;
+	ast_mutex_unlock(&au_lock);
+	ast_update_use_count();
+	return tmp;
+}
+
+static void au_close(struct ast_filestream *s)
+{
+	if (ast_mutex_lock(&au_lock)) {
+		ast_log(LOG_WARNING, "Unable to lock au count\n");
+		return;
+	}
+	localusecnt--;
+	ast_mutex_unlock(&au_lock);
+	ast_update_use_count();
+	close(s->fd);
+	free(s);
+}
+
+static struct ast_frame *au_read(struct ast_filestream *s, int *whennext)
+{
+	int res;
+	int delay;
+	/* Send a frame from the file to the appropriate channel */
+
+	s->fr.frametype = AST_FRAME_VOICE;
+	s->fr.subclass = AST_FORMAT_ULAW;
+	s->fr.offset = AST_FRIENDLY_OFFSET;
+	s->fr.mallocd = 0;
+	s->fr.data = s->buf;
+	if ((res = read(s->fd, s->buf, BUF_SIZE)) < 1) {
+		if (res)
+			ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
+		return NULL;
+	}
+	s->fr.samples = res;
+	s->fr.datalen = res;
+	delay = s->fr.samples;
+	*whennext = delay;
+	return &s->fr;
+}
+
+static int au_write(struct ast_filestream *fs, struct ast_frame *f)
+{
+	int res;
+
+	if (f->frametype != AST_FRAME_VOICE) {
+		ast_log(LOG_WARNING, "Asked to write non-voice frame!\n");
+		return -1;
+	}
+	if (f->subclass != AST_FORMAT_ULAW) {
+		ast_log(LOG_WARNING, "Asked to write non-ulaw frame (%d)!\n", f->subclass);
+		return -1;
+	}
+	if ((res = write(fs->fd, f->data, f->datalen)) != f->datalen) {
+			ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n", res, f->datalen, strerror(errno));
+			return -1;
+	}
+	update_header(fs->fd);
+	return 0;
+}
+
+static int au_seek(struct ast_filestream *fs, long sample_offset, int whence)
+{
+	off_t min, max, cur;
+	long offset = 0, samples;
+	
+	samples = sample_offset;
+	min = AU_HEADER_SIZE;
+	cur = lseek(fs->fd, 0, SEEK_CUR);
+	max = lseek(fs->fd, 0, SEEK_END);
+	if (whence == SEEK_SET)
+		offset = samples + min;
+	else if (whence == SEEK_CUR || whence == SEEK_FORCECUR)
+		offset = samples + cur;
+	else if (whence == SEEK_END)
+		offset = max - samples;
+        if (whence != SEEK_FORCECUR) {
+		offset = (offset > max) ? max : offset;
+	}
+	/* always protect the header space. */
+	offset = (offset < min) ? min : offset;
+	return lseek(fs->fd, offset, SEEK_SET);
+}
+
+static int au_trunc(struct ast_filestream *fs)
+{
+	if(ftruncate(fs->fd, lseek(fs->fd, 0, SEEK_CUR)))
+		return -1;
+	return update_header(fs->fd);
+}
+
+static long au_tell(struct ast_filestream *fs)
+{
+	off_t offset;
+
+	offset = lseek(fs->fd, 0, SEEK_CUR);
+	return offset - AU_HEADER_SIZE;
+}
+
+static char *au_getcomment(struct ast_filestream *s)
+{
+	return NULL;
+}
+
+int load_module()
+{
+	return ast_format_register(name, exts, AST_FORMAT_ULAW,
+				   au_open,
+				   au_rewrite,
+				   au_write,
+				   au_seek,
+				   au_trunc,
+				   au_tell,
+				   au_read,
+				   au_close,
+				   au_getcomment);
+}
+
+int unload_module()
+{
+	return ast_format_unregister(name);
+}
+
+int usecount()
+{
+	return localusecnt;
+}
+
+char *description()
+{
+	return desc;
+}
+
+char *key()
+{
+	return ASTERISK_GPL_KEY;
+}