Translate between various formats natively through DAHDI transcoding. More...

#include "asterisk.h"
#include <fcntl.h>
#include <netinet/in.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/poll.h>
#include <dahdi/user.h>
#include "asterisk/lock.h"
#include "asterisk/translate.h"
#include "asterisk/config.h"
#include "asterisk/module.h"
#include "asterisk/cli.h"
#include "asterisk/channel.h"
#include "asterisk/utils.h"
#include "asterisk/linkedlists.h"
#include "asterisk/ulaw.h"

Include dependency graph for codec_dahdi.c:

Go to the source code of this file.

Data Structures
struct	channel_usage
struct	codec_dahdi_pvt
struct	format_map
struct	translator
struct	translators
	the list of translators More...
Defines
#define	BUFFER_SIZE 8000
#define	G723_SAMPLES 240
#define	G729_SAMPLES 160
Functions
static void	__reg_module (void)
static void	__unreg_module (void)
static void	build_translators (struct format_map *map, unsigned int dstfmts, unsigned int srcfmts)
static int	dahdi_decoder_framein (struct ast_trans_pvt pvt, struct ast_frame f)
static struct ast_frame *	dahdi_decoder_frameout (struct ast_trans_pvt *pvt)
static void	dahdi_destroy (struct ast_trans_pvt *pvt)
static int	dahdi_encoder_framein (struct ast_trans_pvt pvt, struct ast_frame f)
static struct ast_frame *	dahdi_encoder_frameout (struct ast_trans_pvt *pvt)
static int	dahdi_new (struct ast_trans_pvt *pvt)
static int	dahdi_translate (struct ast_trans_pvt *pvt, int dest, int source)
static void	dahdi_write_frame (struct codec_dahdi_pvt dahdip, const uint8_t buffer, const ssize_t count)
static void	drop_translator (int dst, int src)
static struct ast_frame *	fakesrc_sample (void)
static int	find_transcoders (void)
static char *	handle_cli_transcoder_show (struct ast_cli_entry e, int cmd, struct ast_cli_args a)
static int	is_encoder (struct translator *zt)
static int	lintoulaw (struct ast_trans_pvt pvt, struct ast_frame f)
static int	load_module (void)
static int	register_translator (int dst, int src)
static int	reload (void)
static int	ulawtolin (struct ast_trans_pvt *pvt, int samples)
static int	unload_module (void)
static void	unregister_translators (void)
Variables
static struct ast_module_info __MODULE_INFO_SECTION	__mod_info = { __MODULE_INFO_GLOBALS .name = AST_MODULE, .flags = AST_MODFLAG_DEFAULT , .description = "Generic DAHDI Transcoder Codec Translator" , .key = ASTERISK_GPL_KEY , .buildopt_sum = AST_BUILDOPT_SUM, .load = load_module, .unload = unload_module, .reload = reload, }
static struct ast_module_info *	ast_module_info = &__mod_info
static struct channel_usage	channels
static struct ast_cli_entry	cli []
static struct format_map	global_format_map = { { { 0 } } }
static struct translators	translators

Detailed Description

Translate between various formats natively through DAHDI transcoding.

Definition in file codec_dahdi.c.

Define Documentation

#define BUFFER_SIZE 8000

Definition at line 54 of file codec_dahdi.c.

Referenced by register_translator().

#define G723_SAMPLES 240

Definition at line 56 of file codec_dahdi.c.

Referenced by dahdi_translate().

#define G729_SAMPLES 160

Definition at line 57 of file codec_dahdi.c.

Referenced by dahdi_translate().

Function Documentation

static void __reg_module ( void ) [static]

Definition at line 650 of file codec_dahdi.c.

static void __unreg_module ( void ) [static]

Definition at line 650 of file codec_dahdi.c.

static void build_translators	(	struct format_map *	map,
		unsigned int	dstfmts,
		unsigned int	srcfmts
	)		`[static]`

Definition at line 553 of file codec_dahdi.c.

References format_map::map, and register_translator().

Referenced by find_transcoders().

{
   unsigned int src, dst;

   for (src = 0; src < 32; src++) {
      for (dst = 0; dst < 32; dst++) {
         if (!(srcfmts & (1 << src)))
            continue;

         if (!(dstfmts & (1 << dst)))
            continue;

         if (global_format_map.map[dst][src])
            continue;

         if (!register_translator(dst, src))
            map->map[dst][src] = 1;
      }
   }
}

static int dahdi_decoder_framein	(	struct ast_trans_pvt *	pvt,
		struct ast_frame *	f
	)		`[static]`

Definition at line 275 of file codec_dahdi.c.

References ast_log(), dahdi_write_frame(), ast_frame::data, ast_trans_pvt::datalen, ast_frame::datalen, codec_dahdi_pvt::fake, LOG_ERROR, ast_frame::ptr, ast_trans_pvt::pvt, codec_dahdi_pvt::required_samples, ast_frame::samples, ast_trans_pvt::samples, and ast_frame::subclass.

Referenced by register_translator().

{
   struct codec_dahdi_pvt *dahdip = pvt->pvt;

   if (!f->subclass) {
      /* We're just faking a return for calculation purposes. */
      dahdip->fake = 2;
      pvt->samples = f->samples;
      return 0;
   }

   if (!f->datalen) {
      if (f->samples != dahdip->required_samples) {
         ast_log(LOG_ERROR, "%d != %d %d\n", f->samples, dahdip->required_samples, f->datalen);
      }
   }
   dahdi_write_frame(dahdip, f->data.ptr, f->datalen);
   pvt->samples += f->samples;
   pvt->datalen = 0;
   return -1;
}

static struct ast_frame* dahdi_decoder_frameout ( struct ast_trans_pvt * pvt ) [static, read]

Definition at line 297 of file codec_dahdi.c.

References AST_FRAME_VOICE, AST_FRFLAG_FROM_TRANSLATOR, AST_FRIENDLY_OFFSET, ast_log(), ast_set_flag, ast_translator::buf_size, ast_trans_pvt::c, ast_frame::data, ast_trans_pvt::datalen, ast_frame::datalen, ast_translator::dstfmt, errno, ast_trans_pvt::f, codec_dahdi_pvt::fake, codec_dahdi_pvt::fd, ast_frame::frametype, LOG_ERROR, ast_frame::mallocd, ast_translator::name, ast_frame::offset, ast_trans_pvt::outbuf, ast_frame::ptr, ast_trans_pvt::pvt, codec_dahdi_pvt::required_samples, ast_trans_pvt::samples, ast_frame::samples, codec_dahdi_pvt::softslin, ast_frame::src, ast_frame::subclass, ast_trans_pvt::t, codec_dahdi_pvt::ulaw_buffer, and ulawtolin().

Referenced by register_translator().

{
   int res;
   struct codec_dahdi_pvt *dahdip = pvt->pvt;

   if (2 == dahdip->fake) {
      dahdip->fake = 1;
      pvt->f.frametype = AST_FRAME_VOICE;
      pvt->f.subclass = 0;
      pvt->f.samples = dahdip->required_samples;
      pvt->f.data.ptr = NULL;
      pvt->f.offset = 0;
      pvt->f.datalen = 0;
      pvt->f.mallocd = 0;
      ast_set_flag(&pvt->f, AST_FRFLAG_FROM_TRANSLATOR);
      pvt->samples = 0;
      return &pvt->f;
   } else if (1 == dahdip->fake) {
      pvt->samples = 0;
      dahdip->fake = 0;
      return NULL;
   }

   /* Let's check to see if there is a new frame for us.... */
   if (dahdip->softslin) {
      res = read(dahdip->fd, dahdip->ulaw_buffer, sizeof(dahdip->ulaw_buffer));
   } else {
      res = read(dahdip->fd, pvt->outbuf.c + pvt->datalen, pvt->t->buf_size - pvt->datalen);
   }

   if (-1 == res) {
      if (EWOULDBLOCK == errno) {
         /* Nothing waiting... */
         return NULL;
      } else {
         ast_log(LOG_ERROR, "Failed to read from transcoder: %s\n", strerror(errno));
         return NULL;
      }
   } else {
      if (dahdip->softslin) {
         ulawtolin(pvt, res);
         pvt->f.datalen = res * 2;
      } else {
         pvt->f.datalen = res;
      }
      pvt->datalen = 0;
      pvt->f.frametype = AST_FRAME_VOICE;
      pvt->f.subclass = 1 <<  (pvt->t->dstfmt);
      pvt->f.mallocd = 0;
      pvt->f.offset = AST_FRIENDLY_OFFSET;
      pvt->f.src = pvt->t->name;
      pvt->f.data.ptr = pvt->outbuf.c;
      pvt->f.samples = res;
      ast_set_flag(&pvt->f, AST_FRFLAG_FROM_TRANSLATOR);
      pvt->samples = 0;

      return &pvt->f;
   }

   /* Shouldn't get here... */
   return NULL;
}

static void dahdi_destroy ( struct ast_trans_pvt * pvt ) [static]

Definition at line 361 of file codec_dahdi.c.

References ast_atomic_fetchadd_int(), AST_FORMAT_G723_1, AST_FORMAT_G729A, codec_dahdi_pvt::fd, codec_dahdi_pvt::fmts, and ast_trans_pvt::pvt.

Referenced by register_translator().

{
   struct codec_dahdi_pvt *dahdip = pvt->pvt;

   switch (dahdip->fmts.dstfmt) {
   case AST_FORMAT_G729A:
   case AST_FORMAT_G723_1:
      ast_atomic_fetchadd_int(&channels.encoders, -1);
      break;
   default:
      ast_atomic_fetchadd_int(&channels.decoders, -1);
      break;
   }

   close(dahdip->fd);
}

static int dahdi_encoder_framein	(	struct ast_trans_pvt *	pvt,
		struct ast_frame *	f
	)		`[static]`

Definition at line 178 of file codec_dahdi.c.

References ast_log(), dahdi_write_frame(), ast_frame::data, ast_trans_pvt::datalen, codec_dahdi_pvt::fake, lintoulaw(), LOG_ERROR, ast_frame::ptr, ast_trans_pvt::pvt, codec_dahdi_pvt::required_samples, ast_frame::samples, ast_trans_pvt::samples, codec_dahdi_pvt::samples_in_buffer, codec_dahdi_pvt::softslin, ast_frame::subclass, and codec_dahdi_pvt::ulaw_buffer.

Referenced by register_translator().

{
   struct codec_dahdi_pvt *dahdip = pvt->pvt;

   if (!f->subclass) {
      /* We're just faking a return for calculation purposes. */
      dahdip->fake = 2;
      pvt->samples = f->samples;
      return 0;
   }

   /* Buffer up the packets and send them to the hardware if we
    * have enough samples set up. */
   if (dahdip->softslin) {
      if (lintoulaw(pvt, f)) {
          return -1;
      }
   } else {
      /* NOTE:  If softslin support is not needed, and the sample
       * size is equal to the required sample size, we wouldn't
       * need this copy operation.  But at the time this was
       * written, only softslin is supported. */
      if (dahdip->samples_in_buffer + f->samples > sizeof(dahdip->ulaw_buffer)) {
         ast_log(LOG_ERROR, "Out of buffer space.\n");
         return -1;
      }
      memcpy(&dahdip->ulaw_buffer[dahdip->samples_in_buffer], f->data.ptr, f->samples);
      dahdip->samples_in_buffer += f->samples;
   }

   while (dahdip->samples_in_buffer > dahdip->required_samples) {
      dahdi_write_frame(dahdip, dahdip->ulaw_buffer, dahdip->required_samples);
      dahdip->samples_in_buffer -= dahdip->required_samples;
      if (dahdip->samples_in_buffer) {
         /* Shift any remaining bytes down. */
         memmove(dahdip->ulaw_buffer, &dahdip->ulaw_buffer[dahdip->required_samples],
            dahdip->samples_in_buffer);
      }
   }
   pvt->samples += f->samples;
   pvt->datalen = 0;
   return -1;
}

static struct ast_frame* dahdi_encoder_frameout ( struct ast_trans_pvt * pvt ) [static, read]

Definition at line 222 of file codec_dahdi.c.

References AST_FRAME_VOICE, AST_FRFLAG_FROM_TRANSLATOR, AST_FRIENDLY_OFFSET, ast_log(), ast_set_flag, ast_translator::buf_size, ast_trans_pvt::c, ast_frame::data, ast_trans_pvt::datalen, ast_frame::datalen, ast_translator::dstfmt, errno, ast_trans_pvt::f, codec_dahdi_pvt::fake, codec_dahdi_pvt::fd, ast_frame::frametype, LOG_ERROR, ast_frame::mallocd, ast_translator::name, ast_frame::offset, ast_trans_pvt::outbuf, ast_frame::ptr, ast_trans_pvt::pvt, codec_dahdi_pvt::required_samples, ast_trans_pvt::samples, ast_frame::samples, ast_frame::src, ast_frame::subclass, and ast_trans_pvt::t.

Referenced by register_translator().

{
   struct codec_dahdi_pvt *dahdip = pvt->pvt;
   int res;

   if (2 == dahdip->fake) {
      dahdip->fake = 1;
      pvt->f.frametype = AST_FRAME_VOICE;
      pvt->f.subclass = 0;
      pvt->f.samples = dahdip->required_samples;
      pvt->f.data.ptr = NULL;
      pvt->f.offset = 0;
      pvt->f.datalen = 0;
      pvt->f.mallocd = 0;
      ast_set_flag(&pvt->f, AST_FRFLAG_FROM_TRANSLATOR);
      pvt->samples = 0;

      return &pvt->f;

   } else if (1 == dahdip->fake) {
      dahdip->fake = 0;
      return NULL;
   }

   res = read(dahdip->fd, pvt->outbuf.c + pvt->datalen, pvt->t->buf_size - pvt->datalen);
   if (-1 == res) {
      if (EWOULDBLOCK == errno) {
         /* Nothing waiting... */
         return NULL;
      } else {
         ast_log(LOG_ERROR, "Failed to read from transcoder: %s\n", strerror(errno));
         return NULL;
      }
   } else {
      pvt->f.datalen = res;
      pvt->f.samples = dahdip->required_samples;
      pvt->f.frametype = AST_FRAME_VOICE;
      pvt->f.subclass = 1 <<  (pvt->t->dstfmt);
      pvt->f.mallocd = 0;
      pvt->f.offset = AST_FRIENDLY_OFFSET;
      pvt->f.src = pvt->t->name;
      pvt->f.data.ptr = pvt->outbuf.c;
      ast_set_flag(&pvt->f, AST_FRFLAG_FROM_TRANSLATOR);

      pvt->samples = 0;
      pvt->datalen = 0;
      return &pvt->f;
   }

   /* Shouldn't get here... */
   return NULL;
}

static int dahdi_new ( struct ast_trans_pvt * pvt ) [static]

Definition at line 451 of file codec_dahdi.c.

References dahdi_translate(), ast_translator::dstfmt, ast_translator::srcfmt, and ast_trans_pvt::t.

Referenced by register_translator().

{
   return dahdi_translate(pvt, pvt->t->dstfmt, pvt->t->srcfmt);
}

static int dahdi_translate	(	struct ast_trans_pvt *	pvt,
		int	dest,
		int	source
	)		`[static]`

Definition at line 378 of file codec_dahdi.c.

References ast_atomic_fetchadd_int(), ast_debug, AST_FORMAT_G723_1, AST_FORMAT_G729A, AST_FORMAT_SLINEAR, AST_FORMAT_ULAW, ast_log(), errno, codec_dahdi_pvt::fd, codec_dahdi_pvt::fmts, G723_SAMPLES, G729_SAMPLES, LOG_ERROR, LOG_WARNING, ast_trans_pvt::pvt, codec_dahdi_pvt::required_samples, and codec_dahdi_pvt::softslin.

Referenced by dahdi_new().

{
   /* Request translation through zap if possible */
   int fd;
   struct codec_dahdi_pvt *dahdip = pvt->pvt;
   int flags;
   int tried_once = 0;
   const char *dev_filename = "/dev/dahdi/transcode";

   if ((fd = open(dev_filename, O_RDWR)) < 0) {
      ast_log(LOG_ERROR, "Failed to open %s: %s\n", dev_filename, strerror(errno));
      return -1;
   }

   dahdip->fmts.srcfmt = (1 << source);
   dahdip->fmts.dstfmt = (1 << dest);

   ast_debug(1, "Opening transcoder channel from %d to %d.\n", source, dest);

retry:
   if (ioctl(fd, DAHDI_TC_ALLOCATE, &dahdip->fmts)) {
      if ((ENODEV == errno) && !tried_once) {
         /* We requested to translate to/from an unsupported
          * format.  Most likely this is because signed linear
          * was not supported by any hardware devices even
          * though this module always registers signed linear
          * support. In this case we'll retry, requesting
          * support for ULAW instead of signed linear and then
          * we'll just convert from ulaw to signed linear in
          * software. */
         if (AST_FORMAT_SLINEAR == dahdip->fmts.srcfmt) {
            ast_debug(1, "Using soft_slin support on source\n");
            dahdip->softslin = 1;
            dahdip->fmts.srcfmt = AST_FORMAT_ULAW;
         } else if (AST_FORMAT_SLINEAR == dahdip->fmts.dstfmt) {
            ast_debug(1, "Using soft_slin support on destination\n");
            dahdip->softslin = 1;
            dahdip->fmts.dstfmt = AST_FORMAT_ULAW;
         }
         tried_once = 1;
         goto retry;
      }
      ast_log(LOG_ERROR, "Unable to attach to transcoder: %s\n", strerror(errno));
      close(fd);

      return -1;
   }

   flags = fcntl(fd, F_GETFL);
   if (flags > - 1) {
      if (fcntl(fd, F_SETFL, flags | O_NONBLOCK))
         ast_log(LOG_WARNING, "Could not set non-block mode!\n");
   }

   dahdip->fd = fd;

   dahdip->required_samples = ((dahdip->fmts.dstfmt|dahdip->fmts.srcfmt)&AST_FORMAT_G723_1) ? G723_SAMPLES : G729_SAMPLES;

   switch (dahdip->fmts.dstfmt) {
   case AST_FORMAT_G729A:
      ast_atomic_fetchadd_int(&channels.encoders, +1);
      break;
   case AST_FORMAT_G723_1:
      ast_atomic_fetchadd_int(&channels.encoders, +1);
      break;
   default:
      ast_atomic_fetchadd_int(&channels.decoders, +1);
      break;
   }

   return 0;
}

static void dahdi_write_frame	(	struct codec_dahdi_pvt *	dahdip,
		const uint8_t *	buffer,
		const ssize_t	count
	)		`[static]`

Definition at line 159 of file codec_dahdi.c.

References ast_log(), errno, codec_dahdi_pvt::fd, LOG_ERROR, and option_verbose.

Referenced by dahdi_decoder_framein(), and dahdi_encoder_framein().

{
   int res;
   struct pollfd p = {0};
   if (!count) return;
   res = write(dahdip->fd, buffer, count);
   if (option_verbose > 10) {
      if (-1 == res) {
         ast_log(LOG_ERROR, "Failed to write to transcoder: %s\n", strerror(errno));
      }
      if (count != res) {
         ast_log(LOG_ERROR, "Requested write of %zd bytes, but only wrote %d bytes.\n", count, res);
      }
   }
   p.fd = dahdip->fd;
   p.events = POLLOUT;
   res = poll(&p, 1, 50);
}

static void drop_translator	(	int	dst,
		int	src
	)		`[static]`

Definition at line 519 of file codec_dahdi.c.

References ast_free, AST_LIST_LOCK, AST_LIST_REMOVE_CURRENT, AST_LIST_TRAVERSE_SAFE_BEGIN, AST_LIST_TRAVERSE_SAFE_END, AST_LIST_UNLOCK, ast_unregister_translator(), ast_translator::dstfmt, translator::entry, format_map::map, ast_translator::srcfmt, and translator::t.

Referenced by find_transcoders().

{
   struct translator *cur;

   AST_LIST_LOCK(&translators);
   AST_LIST_TRAVERSE_SAFE_BEGIN(&translators, cur, entry) {
      if (cur->t.srcfmt != src)
         continue;

      if (cur->t.dstfmt != dst)
         continue;

      AST_LIST_REMOVE_CURRENT(entry);
      ast_unregister_translator(&cur->t);
      ast_free(cur);
      global_format_map.map[dst][src] = 0;
      break;
   }
   AST_LIST_TRAVERSE_SAFE_END;
   AST_LIST_UNLOCK(&translators);
}

static struct ast_frame* fakesrc_sample ( void ) [static, read]

Definition at line 456 of file codec_dahdi.c.

References AST_FRAME_VOICE, f, and ast_frame::frametype.

Referenced by register_translator().

{
   /* Don't bother really trying to test hardware ones. */
   static struct ast_frame f = {
      .frametype = AST_FRAME_VOICE,
      .samples = 160,
      .src = __PRETTY_FUNCTION__
   };

   return &f;
}

static int find_transcoders ( void ) [static]

Definition at line 574 of file codec_dahdi.c.

References ast_atomic_fetchadd_int(), AST_FORMAT_ALAW, AST_FORMAT_SLINEAR, AST_FORMAT_ULAW, ast_log(), ast_verbose(), build_translators(), drop_translator(), errno, LOG_ERROR, format_map::map, option_verbose, and VERBOSE_PREFIX_2.

Referenced by load_module().

{
   struct dahdi_transcoder_info info = { 0, };
   struct format_map map = { { { 0 } } };
   int fd, res;
   unsigned int x, y;

   if ((fd = open("/dev/dahdi/transcode", O_RDWR)) < 0) {
      ast_log(LOG_ERROR, "Failed to open /dev/dahdi/transcode: %s\n", strerror(errno));
      return 0;
   }

   for (info.tcnum = 0; !(res = ioctl(fd, DAHDI_TC_GETINFO, &info)); info.tcnum++) {
      if (option_verbose > 1)
         ast_verbose(VERBOSE_PREFIX_2 "Found transcoder '%s'.\n", info.name);

      /* Complex codecs need to support signed linear.  If the
       * hardware transcoder does not natively support signed linear
       * format, we will emulate it in software directly in this
       * module. Also, do not allow direct ulaw/alaw to complex
       * codec translation, since that will prevent the generic PLC
       * functions from working. */
      if (info.dstfmts & (AST_FORMAT_ULAW | AST_FORMAT_ALAW)) {
         info.dstfmts |= AST_FORMAT_SLINEAR;
         info.dstfmts &= ~(AST_FORMAT_ULAW | AST_FORMAT_ALAW);
      }
      if (info.srcfmts & (AST_FORMAT_ULAW | AST_FORMAT_ALAW)) {
         info.srcfmts |= AST_FORMAT_SLINEAR;
         info.srcfmts &= ~(AST_FORMAT_ULAW | AST_FORMAT_ALAW);
      }

      build_translators(&map, info.dstfmts, info.srcfmts);
      ast_atomic_fetchadd_int(&channels.total, info.numchannels / 2);

   }

   close(fd);

   if (!info.tcnum && (option_verbose > 1))
      ast_verbose(VERBOSE_PREFIX_2 "No hardware transcoders found.\n");

   for (x = 0; x < 32; x++) {
      for (y = 0; y < 32; y++) {
         if (!map.map[x][y] && global_format_map.map[x][y])
            drop_translator(x, y);
      }
   }

   return 0;
}

static char * handle_cli_transcoder_show	(	struct ast_cli_entry *	e,
		int	cmd,
		struct ast_cli_args *	a
	)		`[static]`

Definition at line 131 of file codec_dahdi.c.

References ast_cli_args::argc, ast_cli(), channels, CLI_GENERATE, CLI_INIT, CLI_SHOWUSAGE, CLI_SUCCESS, ast_cli_entry::command, channel_usage::decoders, channel_usage::encoders, ast_cli_args::fd, channel_usage::total, and ast_cli_entry::usage.

{
   struct channel_usage copy;

   switch (cmd) {
   case CLI_INIT:
      e->command = "transcoder show";
      e->usage =
         "Usage: transcoder show\n"
         "       Displays channel utilization of DAHDI transcoder(s).\n";
      return NULL;
   case CLI_GENERATE:
      return NULL;
   }

   if (a->argc != 2)
      return CLI_SHOWUSAGE;

   copy = channels;

   if (copy.total == 0)
      ast_cli(a->fd, "No DAHDI transcoders found.\n");
   else
      ast_cli(a->fd, "%d/%d encoders/decoders of %d channels are in use.\n", copy.encoders, copy.decoders, copy.total);

   return CLI_SUCCESS;
}

static int is_encoder ( struct translator * zt ) [static]

Definition at line 468 of file codec_dahdi.c.

References AST_FORMAT_ALAW, AST_FORMAT_SLINEAR, AST_FORMAT_ULAW, ast_translator::srcfmt, and translator::t.

Referenced by register_translator().

{
   if (zt->t.srcfmt&(AST_FORMAT_ULAW|AST_FORMAT_ALAW|AST_FORMAT_SLINEAR)) {
      return 1;
   } else {
      return 0;
   }
}

static int lintoulaw	(	struct ast_trans_pvt *	pvt,
		struct ast_frame *	f
	)		`[static]`

Definition at line 111 of file codec_dahdi.c.

References AST_LIN2MU, ast_log(), ast_frame::data, LOG_ERROR, ast_frame::ptr, ast_trans_pvt::pvt, ast_frame::samples, codec_dahdi_pvt::samples_in_buffer, and codec_dahdi_pvt::ulaw_buffer.

Referenced by dahdi_encoder_framein().

{
   struct codec_dahdi_pvt *dahdip = pvt->pvt;
   int i = f->samples;
   uint8_t *dst = &dahdip->ulaw_buffer[dahdip->samples_in_buffer];
   int16_t *src = f->data.ptr;

   if (dahdip->samples_in_buffer + i > sizeof(dahdip->ulaw_buffer)) {
      ast_log(LOG_ERROR, "Out of buffer space!\n");
      return -i;
   }

   while (i--) {
      *dst++ = AST_LIN2MU(*src++);
   }

   dahdip->samples_in_buffer += f->samples;
   return 0;
}

static int load_module ( void ) [static]

Definition at line 638 of file codec_dahdi.c.

References ARRAY_LEN, ast_cli_register_multiple(), AST_MODULE_LOAD_SUCCESS, ast_ulaw_init(), and find_transcoders().

{
   ast_ulaw_init();
   find_transcoders();
   ast_cli_register_multiple(cli, ARRAY_LEN(cli));
   return AST_MODULE_LOAD_SUCCESS;
}

static int register_translator	(	int	dst,
		int	src
	)		`[static]`

Definition at line 477 of file codec_dahdi.c.

References ast_calloc, ast_free, ast_getformatname(), AST_LIST_INSERT_HEAD, AST_LIST_LOCK, AST_LIST_UNLOCK, ast_register_translator, ast_translator::buf_size, ast_translator::buffer_samples, BUFFER_SIZE, dahdi_decoder_framein(), dahdi_decoder_frameout(), dahdi_destroy(), dahdi_encoder_framein(), dahdi_encoder_frameout(), dahdi_new(), ast_translator::desc_size, ast_translator::destroy, ast_translator::dstfmt, translator::entry, fakesrc_sample(), ast_translator::framein, ast_translator::frameout, is_encoder(), format_map::map, ast_translator::name, ast_translator::native_plc, ast_translator::newpvt, ast_translator::sample, ast_translator::srcfmt, and translator::t.

Referenced by build_translators().

{
   struct translator *zt;
   int res;

   if (!(zt = ast_calloc(1, sizeof(*zt)))) {
      return -1;
   }

   snprintf((char *) (zt->t.name), sizeof(zt->t.name), "zap%sto%s",
       ast_getformatname((1 << src)), ast_getformatname((1 << dst)));
   zt->t.srcfmt = (1 << src);
   zt->t.dstfmt = (1 << dst);
   zt->t.buf_size = BUFFER_SIZE;
   if (is_encoder(zt)) {
      zt->t.framein = dahdi_encoder_framein;
      zt->t.frameout = dahdi_encoder_frameout;
   } else {
      zt->t.framein = dahdi_decoder_framein;
      zt->t.frameout = dahdi_decoder_frameout;
   }
   zt->t.destroy = dahdi_destroy;
   zt->t.buffer_samples = 0;
   zt->t.newpvt = dahdi_new;
   zt->t.sample = fakesrc_sample;
   zt->t.native_plc = 0;

   zt->t.desc_size = sizeof(struct codec_dahdi_pvt);
   if ((res = ast_register_translator(&zt->t))) {
      ast_free(zt);
      return -1;
   }

   AST_LIST_LOCK(&translators);
   AST_LIST_INSERT_HEAD(&translators, zt, entry);
   AST_LIST_UNLOCK(&translators);

   global_format_map.map[dst][src] = 1;

   return res;
}

static int reload ( void ) [static]

Definition at line 625 of file codec_dahdi.c.

References AST_MODULE_LOAD_SUCCESS.

{
   return AST_MODULE_LOAD_SUCCESS;
}

static int ulawtolin	(	struct ast_trans_pvt *	pvt,
		int	samples
	)		`[static]`

Definition at line 95 of file codec_dahdi.c.

References AST_MULAW, ast_trans_pvt::datalen, ast_trans_pvt::i16, ast_trans_pvt::outbuf, ast_trans_pvt::pvt, and codec_dahdi_pvt::ulaw_buffer.

Referenced by dahdi_decoder_frameout().

{
   struct codec_dahdi_pvt *dahdip = pvt->pvt;
   int i = samples;
   uint8_t *src = &dahdip->ulaw_buffer[0];
   int16_t *dst = pvt->outbuf.i16 + pvt->datalen;

   /* convert and copy in outbuf */
   while (i--) {
      *dst++ = AST_MULAW(*src++);
   }

   return 0;
}

static int unload_module ( void ) [static]

Definition at line 630 of file codec_dahdi.c.

References ARRAY_LEN, ast_cli_unregister_multiple(), and unregister_translators().

{
   ast_cli_unregister_multiple(cli, ARRAY_LEN(cli));
   unregister_translators();

   return 0;
}

static void unregister_translators ( void ) [static]

Definition at line 541 of file codec_dahdi.c.

References ast_free, AST_LIST_LOCK, AST_LIST_REMOVE_HEAD, AST_LIST_UNLOCK, ast_unregister_translator(), translator::entry, and translator::t.

Referenced by unload_module().

{
   struct translator *cur;

   AST_LIST_LOCK(&translators);
   while ((cur = AST_LIST_REMOVE_HEAD(&translators, entry))) {
      ast_unregister_translator(&cur->t);
      ast_free(cur);
   }
   AST_LIST_UNLOCK(&translators);
}

Variable Documentation

struct ast_module_info __MODULE_INFO_SECTION __mod_info = { __MODULE_INFO_GLOBALS .name = AST_MODULE, .flags = AST_MODFLAG_DEFAULT , .description = "Generic DAHDI Transcoder Codec Translator" , .key = ASTERISK_GPL_KEY , .buildopt_sum = AST_BUILDOPT_SUM, .load = load_module, .unload = unload_module, .reload = reload, } [static]

Definition at line 650 of file codec_dahdi.c.

struct ast_module_info* ast_module_info = &__mod_info [static]

Definition at line 650 of file codec_dahdi.c.

struct channel_usage channels [static]

Referenced by check_header(), and handle_cli_transcoder_show().

struct ast_cli_entry cli[] [static]

Initial value:

 {
   AST_CLI_DEFINE(handle_cli_transcoder_show, "Display DAHDI transcoder utilization.")
}

Definition at line 67 of file codec_dahdi.c.

struct format_map global_format_map = { { { 0 } } } [static]

Definition at line 75 of file codec_dahdi.c.

struct translators translators [static]

Asterisk developer's documentation

codec_dahdi.c File Reference
Module: Codecs

Data Structures

Defines

Functions

Variables

Detailed Description

Define Documentation

Function Documentation

Variable Documentation

Asterisk developer's documentation

codec_dahdi.c File ReferenceModule: Codecs

Data Structures

Defines

Functions

Variables

Detailed Description

Define Documentation

Function Documentation

Variable Documentation

codec_dahdi.c File Reference
Module: Codecs