codec_dahdi.c File Reference

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

#include "asterisk.h"
#include <stdbool.h>
#include <poll.h>
#include <fcntl.h>
#include <netinet/in.h>
#include <sys/ioctl.h>
#include <sys/mman.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 "asterisk/format_compatibility.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	translator
struct	translators
	the list of translators More...

Macros
#define	BUFFER_SIZE   8000
#define	container_of(ptr, type, member)    ((type *)((char *)(ptr) - offsetof(type, member)))
#define	DAHDI_FORMAT_ADPCM   (1 << 5)
#define	DAHDI_FORMAT_ALAW   (1 << 3)
#define	DAHDI_FORMAT_G723_1   (1 << 0)
#define	DAHDI_FORMAT_G726   (1 << 4)
#define	DAHDI_FORMAT_G729A   (1 << 8)
#define	DAHDI_FORMAT_GSM   (1 << 1)
#define	DAHDI_FORMAT_ILBC   (1 << 10)
#define	DAHDI_FORMAT_LPC10   (1 << 7)
#define	DAHDI_FORMAT_SLINEAR   (1 << 6)
#define	DAHDI_FORMAT_SPEEX   (1 << 9)
#define	DAHDI_FORMAT_ULAW   (1 << 2)
#define	G723_SAMPLES   240
#define	G729_SAMPLES   160
#define	ULAW_SAMPLES   160

Functions
static void	__reg_module (void)
static void	__unreg_module (void)
struct ast_module *	AST_MODULE_SELF_SYM (void)
static void	build_translators (uint32_t dstfmts, uint32_t 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 struct ast_format *	dahdi_format_to_cached (int format)
static int	dahdi_new (struct ast_trans_pvt *pvt)
static int	dahdi_translate (struct ast_trans_pvt *pvt, uint32_t dst_dahdi_fmt, uint32_t src_dahdi_fmt)
static void	dahdi_wait_for_packet (int fd)
static void	dahdi_write_frame (struct codec_dahdi_pvt *dahdip, const uint8_t *buffer, const ssize_t count)
static struct ast_frame *	fakesrc_sample (void)
static int	find_transcoders (void)
static const struct ast_codec *	get_dahdi_codec (uint32_t dahdi_fmt)
static char *	handle_cli_transcoder_show (struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
static bool	is_already_registered (uint32_t dstfmt, uint32_t srcfmt)
static bool	is_encoder (uint32_t src_dahdi_fmt)
static int	lintoulaw (struct ast_trans_pvt *pvt, struct ast_frame *f)
static int	load_module (void)
static int	register_translator (uint32_t dst_dahdi_fmt, uint32_t src_dahdi_fmt)
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	__mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_DEFAULT , .description = "Generic DAHDI Transcoder Codec Translator" , .key = ASTERISK_GPL_KEY , .buildopt_sum = AST_BUILDOPT_SUM, .support_level = AST_MODULE_SUPPORT_CORE, .load = load_module, .unload = unload_module, .reload = reload, }
static const struct ast_module_info *	ast_module_info = &__mod_info
static struct channel_usage	channels
static struct ast_cli_entry	cli []
static struct translators	translators = AST_LIST_HEAD_INIT_VALUE

Detailed Description

Translate between various formats natively through DAHDI transcoding.

Definition in file codec_dahdi.c.

Macro Definition Documentation

BUFFER_SIZE

#define BUFFER_SIZE   8000

Definition at line 55 of file codec_dahdi.c.

container_of

#define container_of	(		ptr,
			type,
			member
	)		((type *)((char *)(ptr) - offsetof(type, member)))

Definition at line 277 of file codec_dahdi.c.

                       {
    int fd;
    struct dahdi_transcoder_formats fmts;
    unsigned int softslin:1;
    unsigned int fake:2;
    uint16_t required_samples;
    uint16_t samples_in_buffer;
    uint16_t samples_written_to_hardware;
    uint8_t ulaw_buffer[1024];
};
 
/* Only used by a decoder */
static int ulawtolin(struct ast_trans_pvt *pvt, int samples)
{
    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;
}
 
/* Only used by an encoder. */
static int lintoulaw(struct ast_trans_pvt *pvt, struct ast_frame *f)
{
    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 char *handle_cli_transcoder_show(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
    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 void dahdi_write_frame(struct codec_dahdi_pvt *dahdip, const uint8_t *buffer, const ssize_t count)
{
    int res;
    if (!count) return;
    res = write(dahdip->fd, buffer, count);
    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);
    }
}
 
static int dahdi_encoder_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
{
    struct codec_dahdi_pvt *dahdip = pvt->pvt;
 
    if (!f->subclass.format) {
        /* 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_written_to_hardware += 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 void dahdi_wait_for_packet(int fd)
{
    struct pollfd p = {0};
    p.fd = fd;
    p.events = POLLIN;
    poll(&p, 1, 10);
}
 
static struct ast_frame *dahdi_encoder_frameout(struct ast_trans_pvt *pvt)
{
    struct codec_dahdi_pvt *dahdip = pvt->pvt;
    int res;
 
    if (2 == dahdip->fake) {
        struct ast_frame frm = {
            .frametype = AST_FRAME_VOICE,
            .samples = dahdip->required_samples,
            .src = pvt->t->name,
        };
 
        dahdip->fake = 1;
        pvt->samples = 0;
 
        return ast_frisolate(&frm);
    } else if (1 == dahdip->fake) {
        dahdip->fake = 0;
        return NULL;
    }
 
    if (dahdip->samples_written_to_hardware >= dahdip->required_samples) {
        dahdi_wait_for_packet(dahdip->fd);
    }
 
    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 = ast_codec_samples_count(&pvt->f);
 
        dahdip->samples_written_to_hardware =
          (dahdip->samples_written_to_hardware >= pvt->f.samples) ?
             dahdip->samples_written_to_hardware - pvt->f.samples : 0;
 
        pvt->samples = 0;
        pvt->datalen = 0;
        return ast_frisolate(&pvt->f);
    }
 
    /* Shouldn't get here... */
    return NULL;
}
 
static int dahdi_decoder_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
{
    struct codec_dahdi_pvt *dahdip = pvt->pvt;
 
    if (!f->subclass.format) {
        /* 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);
    dahdip->samples_written_to_hardware += f->samples;
    pvt->samples += f->samples;
    pvt->datalen = 0;
    return -1;
}
 
static struct ast_frame *dahdi_decoder_frameout(struct ast_trans_pvt *pvt)
{
    int res;
    struct codec_dahdi_pvt *dahdip = pvt->pvt;
 
    if (2 == dahdip->fake) {
        struct ast_frame frm = {
            .frametype = AST_FRAME_VOICE,
            .samples = dahdip->required_samples,
            .src = pvt->t->name,
        };
 
        dahdip->fake = 1;
        pvt->samples = 0;
 
        return ast_frisolate(&frm);
    } else if (1 == dahdip->fake) {
        pvt->samples = 0;
        dahdip->fake = 0;
        return NULL;
    }
 
    if (dahdip->samples_written_to_hardware >= ULAW_SAMPLES) {
        dahdi_wait_for_packet(dahdip->fd);
    }
 
    /* 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.samples = res;
        pvt->samples = 0;
        dahdip->samples_written_to_hardware =
            (dahdip->samples_written_to_hardware >= res) ?
                    dahdip->samples_written_to_hardware - res : 0;
 
        return ast_frisolate(&pvt->f);
    }
 
    /* Shouldn't get here... */
    return NULL;
}
 
 
static void dahdi_destroy(struct ast_trans_pvt *pvt)
{
    struct codec_dahdi_pvt *dahdip = pvt->pvt;
 
    switch (dahdip->fmts.dstfmt) {
    case DAHDI_FORMAT_G729A:
    case DAHDI_FORMAT_G723_1:
        ast_atomic_fetchadd_int(&channels.encoders, -1);
        break;
    default:
        ast_atomic_fetchadd_int(&channels.decoders, -1);
        break;
    }
 
    close(dahdip->fd);
}
 
static struct ast_format *dahdi_format_to_cached(int format)
{
    switch (format) {
    case DAHDI_FORMAT_G723_1:
        return ast_format_g723;
    case DAHDI_FORMAT_GSM:
        return ast_format_gsm;
    case DAHDI_FORMAT_ULAW:
        return ast_format_ulaw;
    case DAHDI_FORMAT_ALAW:
        return ast_format_alaw;
    case DAHDI_FORMAT_G726:
        return ast_format_g726;
    case DAHDI_FORMAT_ADPCM:
        return ast_format_adpcm;
    case DAHDI_FORMAT_SLINEAR:
        return ast_format_slin;
    case DAHDI_FORMAT_LPC10:
        return ast_format_lpc10;
    case DAHDI_FORMAT_G729A:
        return ast_format_g729;
    case DAHDI_FORMAT_SPEEX:
        return ast_format_speex;
    case DAHDI_FORMAT_ILBC:
        return ast_format_ilbc;
    }
 
    /* This will never be reached */
    ast_assert(0);
    return NULL;
}
 
static int dahdi_translate(struct ast_trans_pvt *pvt, uint32_t dst_dahdi_fmt, uint32_t src_dahdi_fmt)
{
    /* Request translation through zap if possible */
    int fd;
    struct codec_dahdi_pvt *dahdip = pvt->pvt;
    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 = src_dahdi_fmt;
    dahdip->fmts.dstfmt = dst_dahdi_fmt;
 
    ast_assert(pvt->f.subclass.format == NULL);
    pvt->f.subclass.format = ao2_bump(dahdi_format_to_cached(dahdip->fmts.dstfmt));
 
    ast_debug(1, "Opening transcoder channel from %s to %s.\n", pvt->t->src_codec.name, pvt->t->dst_codec.name);
 
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 (dahdip->fmts.srcfmt == DAHDI_FORMAT_SLINEAR) {
                ast_debug(1, "Using soft_slin support on source\n");
                dahdip->softslin = 1;
                dahdip->fmts.srcfmt = DAHDI_FORMAT_ULAW;
            } else if (dahdip->fmts.dstfmt == DAHDI_FORMAT_SLINEAR) {
                ast_debug(1, "Using soft_slin support on destination\n");
                dahdip->softslin = 1;
                dahdip->fmts.dstfmt = DAHDI_FORMAT_ULAW;
            }
            tried_once = 1;
            goto retry;
        }
        ast_log(LOG_ERROR, "Unable to attach to transcoder: %s\n", strerror(errno));
        close(fd);
 
        return -1;
    }
 
    ast_fd_set_flags(fd, O_NONBLOCK);
 
    dahdip->fd = fd;
 
    dahdip->required_samples = ((dahdip->fmts.dstfmt|dahdip->fmts.srcfmt) & (DAHDI_FORMAT_G723_1)) ? G723_SAMPLES : G729_SAMPLES;
 
    switch (dahdip->fmts.dstfmt) {
    case DAHDI_FORMAT_G729A:
        ast_atomic_fetchadd_int(&channels.encoders, +1);
        break;
    case DAHDI_FORMAT_G723_1:
        ast_atomic_fetchadd_int(&channels.encoders, +1);
        break;
    default:
        ast_atomic_fetchadd_int(&channels.decoders, +1);
        break;
    }
 
    return 0;
}
 
static int dahdi_new(struct ast_trans_pvt *pvt)
{
    struct translator *zt = container_of(pvt->t, struct translator, t);
 
    return dahdi_translate(pvt, zt->dst_dahdi_fmt, zt->src_dahdi_fmt);
}
 
static struct ast_frame *fakesrc_sample(void)
{
    /* 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 bool is_encoder(uint32_t src_dahdi_fmt)
{
    return ((src_dahdi_fmt & (DAHDI_FORMAT_ULAW | DAHDI_FORMAT_ALAW | DAHDI_FORMAT_SLINEAR)) > 0);
}
 
/* Must be called with the translators list locked. */
static int register_translator(uint32_t dst_dahdi_fmt, uint32_t src_dahdi_fmt)
{
    const struct ast_codec *dst_codec;
    const struct ast_codec *src_codec;
    struct translator *zt;
    int res;
 
    dst_codec = get_dahdi_codec(dst_dahdi_fmt);
    src_codec = get_dahdi_codec(src_dahdi_fmt);
    if (!dst_codec || !src_codec) {
        return -1;
    }
 
    if (!(zt = ast_calloc(1, sizeof(*zt)))) {
        return -1;
    }
 
    zt->src_dahdi_fmt = src_dahdi_fmt;
    zt->dst_dahdi_fmt = dst_dahdi_fmt;
 
    snprintf(zt->t.name, sizeof(zt->t.name), "dahdi_%s_to_%s",
        src_codec->name, dst_codec->name);
 
    memcpy(&zt->t.src_codec, src_codec, sizeof(*src_codec));
    memcpy(&zt->t.dst_codec, dst_codec, sizeof(*dst_codec));
    zt->t.buf_size = BUFFER_SIZE;
    if (is_encoder(src_dahdi_fmt)) {
        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_INSERT_HEAD(&translators, zt, entry);
 
    return res;
}
 
static void unregister_translators(void)
{
    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);
}
 
/* Must be called with the translators list locked. */
static bool is_already_registered(uint32_t dstfmt, uint32_t srcfmt)
{
    bool res = false;
    const struct translator *zt;
 
    AST_LIST_TRAVERSE(&translators, zt, entry) {
        if ((zt->src_dahdi_fmt == srcfmt) && (zt->dst_dahdi_fmt == dstfmt)) {
            res = true;
            break;
        }
    }
 
    return res;
}
 
static void build_translators(uint32_t dstfmts, uint32_t srcfmts)
{
    uint32_t srcfmt;
    uint32_t dstfmt;
 
    AST_LIST_LOCK(&translators);
 
    for (srcfmt = 1; srcfmt != 0; srcfmt <<= 1) {
        for (dstfmt = 1; dstfmt != 0; dstfmt <<= 1) {
            if (!(dstfmts & dstfmt) || !(srcfmts & srcfmt)) {
                continue;
            }
            if (is_already_registered(dstfmt, srcfmt)) {
                continue;
            }
            register_translator(dstfmt, srcfmt);
        }
    }
 
    AST_LIST_UNLOCK(&translators);
}
 
static int find_transcoders(void)
{
    struct dahdi_transcoder_info info = { 0, };
    int fd;
 
    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; !ioctl(fd, DAHDI_TC_GETINFO, &info); info.tcnum++) {
        ast_verb(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 & (DAHDI_FORMAT_ULAW | DAHDI_FORMAT_ALAW)) {
            info.dstfmts |= DAHDI_FORMAT_SLINEAR;
            info.dstfmts &= ~(DAHDI_FORMAT_ULAW | DAHDI_FORMAT_ALAW);
        }
        if (info.srcfmts & (DAHDI_FORMAT_ULAW | DAHDI_FORMAT_ALAW)) {
            info.srcfmts |= DAHDI_FORMAT_SLINEAR;
            info.srcfmts &= ~(DAHDI_FORMAT_ULAW | DAHDI_FORMAT_ALAW);
        }
 
        build_translators(info.dstfmts, info.srcfmts);
        ast_atomic_fetchadd_int(&channels.total, info.numchannels / 2);
    }
 
    close(fd);
 
    if (!info.tcnum) {
        ast_verb(2, "No hardware transcoders found.\n");
    }
 
    return 0;
}
 
static int reload(void)
{
    return AST_MODULE_LOAD_SUCCESS;
}
 
static int unload_module(void)
{
    ast_cli_unregister_multiple(cli, ARRAY_LEN(cli));
    unregister_translators();
 
    return 0;
}
 
static int load_module(void)
{
    find_transcoders();
    ast_cli_register_multiple(cli, ARRAY_LEN(cli));
    return AST_MODULE_LOAD_SUCCESS;
}
 
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_DEFAULT, "Generic DAHDI Transcoder Codec Translator",
    .support_level = AST_MODULE_SUPPORT_CORE,
    .load = load_module,
    .unload = unload_module,
    .reload = reload,
);

DAHDI_FORMAT_ADPCM

#define DAHDI_FORMAT_ADPCM   (1 << 5)

ADPCM (IMA)

Definition at line 74 of file codec_dahdi.c.

DAHDI_FORMAT_ALAW

#define DAHDI_FORMAT_ALAW   (1 << 3)

Raw A-law data (G.711)

Definition at line 70 of file codec_dahdi.c.

DAHDI_FORMAT_G723_1

#define DAHDI_FORMAT_G723_1   (1 << 0)

G.723.1 compression

Definition at line 64 of file codec_dahdi.c.

DAHDI_FORMAT_G726

#define DAHDI_FORMAT_G726   (1 << 4)

ADPCM (G.726, 32kbps)

Definition at line 72 of file codec_dahdi.c.

DAHDI_FORMAT_G729A

#define DAHDI_FORMAT_G729A   (1 << 8)

G.729A audio

Definition at line 80 of file codec_dahdi.c.

DAHDI_FORMAT_GSM

#define DAHDI_FORMAT_GSM   (1 << 1)

GSM compression

Definition at line 66 of file codec_dahdi.c.

DAHDI_FORMAT_ILBC

#define DAHDI_FORMAT_ILBC   (1 << 10)

iLBC Free Compression

Definition at line 84 of file codec_dahdi.c.

DAHDI_FORMAT_LPC10

#define DAHDI_FORMAT_LPC10   (1 << 7)

LPC10, 180 samples/frame

Definition at line 78 of file codec_dahdi.c.

DAHDI_FORMAT_SLINEAR

#define DAHDI_FORMAT_SLINEAR   (1 << 6)

Raw 16-bit Signed Linear (8000 Hz) PCM

Definition at line 76 of file codec_dahdi.c.

DAHDI_FORMAT_SPEEX

#define DAHDI_FORMAT_SPEEX   (1 << 9)

SpeeX Free Compression

Definition at line 82 of file codec_dahdi.c.

DAHDI_FORMAT_ULAW

#define DAHDI_FORMAT_ULAW   (1 << 2)

Raw mu-law data (G.711)

Definition at line 68 of file codec_dahdi.c.

G723_SAMPLES

#define G723_SAMPLES   240

Definition at line 57 of file codec_dahdi.c.

G729_SAMPLES

#define G729_SAMPLES   160

Definition at line 58 of file codec_dahdi.c.

ULAW_SAMPLES

#define ULAW_SAMPLES   160

Definition at line 59 of file codec_dahdi.c.

Function Documentation

__reg_module()

static void __reg_module ( void  )

static

Definition at line 873 of file codec_dahdi.c.

__unreg_module()

static void __unreg_module ( void  )

static

Definition at line 873 of file codec_dahdi.c.

AST_MODULE_SELF_SYM()

struct ast_module * AST_MODULE_SELF_SYM

(

void

)

Definition at line 873 of file codec_dahdi.c.

build_translators()

static void build_translators ( uint32_t  dstfmts, uint32_t  srcfmts  )

static

Definition at line 785 of file codec_dahdi.c.

{
    uint32_t srcfmt;
    uint32_t dstfmt;
 
    AST_LIST_LOCK(&translators);
 
    for (srcfmt = 1; srcfmt != 0; srcfmt <<= 1) {
        for (dstfmt = 1; dstfmt != 0; dstfmt <<= 1) {
            if (!(dstfmts & dstfmt) || !(srcfmts & srcfmt)) {
                continue;
            }
            if (is_already_registered(dstfmt, srcfmt)) {
                continue;
            }
            register_translator(dstfmt, srcfmt);
        }
    }
 
    AST_LIST_UNLOCK(&translators);
}

References AST_LIST_LOCK, AST_LIST_UNLOCK, is_already_registered(), and register_translator().

Referenced by find_transcoders().

dahdi_decoder_framein()

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

static

Definition at line 476 of file codec_dahdi.c.

{
    struct codec_dahdi_pvt *dahdip = pvt->pvt;
 
    if (!f->subclass.format) {
        /* 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);
    dahdip->samples_written_to_hardware += f->samples;
    pvt->samples += f->samples;
    pvt->datalen = 0;
    return -1;
}

References ast_log, dahdi_write_frame(), ast_frame::data, ast_frame::datalen, ast_trans_pvt::datalen, codec_dahdi_pvt::fake, ast_frame_subclass::format, 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_written_to_hardware, and ast_frame::subclass.

Referenced by register_translator().

dahdi_decoder_frameout()

static struct ast_frame * dahdi_decoder_frameout ( struct ast_trans_pvt *  pvt )

static

Definition at line 499 of file codec_dahdi.c.

{
    int res;
    struct codec_dahdi_pvt *dahdip = pvt->pvt;
 
    if (2 == dahdip->fake) {
        struct ast_frame frm = {
            .frametype = AST_FRAME_VOICE,
            .samples = dahdip->required_samples,
            .src = pvt->t->name,
        };
 
        dahdip->fake = 1;
        pvt->samples = 0;
 
        return ast_frisolate(&frm);
    } else if (1 == dahdip->fake) {
        pvt->samples = 0;
        dahdip->fake = 0;
        return NULL;
    }
 
    if (dahdip->samples_written_to_hardware >= ULAW_SAMPLES) {
        dahdi_wait_for_packet(dahdip->fd);
    }
 
    /* 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.samples = res;
        pvt->samples = 0;
        dahdip->samples_written_to_hardware =
            (dahdip->samples_written_to_hardware >= res) ?
                    dahdip->samples_written_to_hardware - res : 0;
 
        return ast_frisolate(&pvt->f);
    }
 
    /* Shouldn't get here... */
    return NULL;
}

References AST_FRAME_VOICE, ast_frisolate, ast_log, ast_translator::buf_size, ast_trans_pvt::c, dahdi_wait_for_packet(), ast_frame::datalen, ast_trans_pvt::datalen, errno, ast_trans_pvt::f, codec_dahdi_pvt::fake, codec_dahdi_pvt::fd, ast_frame::frametype, LOG_ERROR, ast_translator::name, NULL, ast_trans_pvt::outbuf, ast_trans_pvt::pvt, codec_dahdi_pvt::required_samples, ast_frame::samples, ast_trans_pvt::samples, codec_dahdi_pvt::samples_written_to_hardware, codec_dahdi_pvt::softslin, ast_trans_pvt::t, codec_dahdi_pvt::ulaw_buffer, ULAW_SAMPLES, and ulawtolin.

Referenced by register_translator().

dahdi_destroy()

static void dahdi_destroy ( struct ast_trans_pvt *  pvt )

static

Definition at line 562 of file codec_dahdi.c.

{
    struct codec_dahdi_pvt *dahdip = pvt->pvt;
 
    switch (dahdip->fmts.dstfmt) {
    case DAHDI_FORMAT_G729A:
    case DAHDI_FORMAT_G723_1:
        ast_atomic_fetchadd_int(&channels.encoders, -1);
        break;
    default:
        ast_atomic_fetchadd_int(&channels.decoders, -1);
        break;
    }
 
    close(dahdip->fd);
}

References ast_atomic_fetchadd_int(), channels, DAHDI_FORMAT_G723_1, DAHDI_FORMAT_G729A, channel_usage::decoders, channel_usage::encoders, codec_dahdi_pvt::fd, codec_dahdi_pvt::fmts, and ast_trans_pvt::pvt.

Referenced by register_translator().

dahdi_encoder_framein()

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

static

Definition at line 372 of file codec_dahdi.c.

{
    struct codec_dahdi_pvt *dahdip = pvt->pvt;
 
    if (!f->subclass.format) {
        /* 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_written_to_hardware += 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;
}

References ast_log, dahdi_write_frame(), ast_frame::data, ast_trans_pvt::datalen, codec_dahdi_pvt::fake, ast_frame_subclass::format, 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::samples_written_to_hardware, codec_dahdi_pvt::softslin, ast_frame::subclass, and codec_dahdi_pvt::ulaw_buffer.

Referenced by register_translator().

dahdi_encoder_frameout()

static struct ast_frame * dahdi_encoder_frameout ( struct ast_trans_pvt *  pvt )

static

Definition at line 425 of file codec_dahdi.c.

{
    struct codec_dahdi_pvt *dahdip = pvt->pvt;
    int res;
 
    if (2 == dahdip->fake) {
        struct ast_frame frm = {
            .frametype = AST_FRAME_VOICE,
            .samples = dahdip->required_samples,
            .src = pvt->t->name,
        };
 
        dahdip->fake = 1;
        pvt->samples = 0;
 
        return ast_frisolate(&frm);
    } else if (1 == dahdip->fake) {
        dahdip->fake = 0;
        return NULL;
    }
 
    if (dahdip->samples_written_to_hardware >= dahdip->required_samples) {
        dahdi_wait_for_packet(dahdip->fd);
    }
 
    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 = ast_codec_samples_count(&pvt->f);
 
        dahdip->samples_written_to_hardware =
          (dahdip->samples_written_to_hardware >= pvt->f.samples) ?
             dahdip->samples_written_to_hardware - pvt->f.samples : 0;
 
        pvt->samples = 0;
        pvt->datalen = 0;
        return ast_frisolate(&pvt->f);
    }
 
    /* Shouldn't get here... */
    return NULL;
}

References ast_codec_samples_count(), AST_FRAME_VOICE, ast_frisolate, ast_log, ast_translator::buf_size, ast_trans_pvt::c, dahdi_wait_for_packet(), ast_frame::datalen, ast_trans_pvt::datalen, errno, ast_trans_pvt::f, codec_dahdi_pvt::fake, codec_dahdi_pvt::fd, ast_frame::frametype, LOG_ERROR, ast_translator::name, NULL, ast_trans_pvt::outbuf, ast_trans_pvt::pvt, codec_dahdi_pvt::required_samples, ast_frame::samples, ast_trans_pvt::samples, codec_dahdi_pvt::samples_written_to_hardware, and ast_trans_pvt::t.

Referenced by register_translator().

dahdi_format_to_cached()

static struct ast_format * dahdi_format_to_cached ( int  format )

static

Definition at line 579 of file codec_dahdi.c.

{
    switch (format) {
    case DAHDI_FORMAT_G723_1:
        return ast_format_g723;
    case DAHDI_FORMAT_GSM:
        return ast_format_gsm;
    case DAHDI_FORMAT_ULAW:
        return ast_format_ulaw;
    case DAHDI_FORMAT_ALAW:
        return ast_format_alaw;
    case DAHDI_FORMAT_G726:
        return ast_format_g726;
    case DAHDI_FORMAT_ADPCM:
        return ast_format_adpcm;
    case DAHDI_FORMAT_SLINEAR:
        return ast_format_slin;
    case DAHDI_FORMAT_LPC10:
        return ast_format_lpc10;
    case DAHDI_FORMAT_G729A:
        return ast_format_g729;
    case DAHDI_FORMAT_SPEEX:
        return ast_format_speex;
    case DAHDI_FORMAT_ILBC:
        return ast_format_ilbc;
    }
 
    /* This will never be reached */
    ast_assert(0);
    return NULL;
}

References ast_assert, ast_format_adpcm, ast_format_alaw, ast_format_g723, ast_format_g726, ast_format_g729, ast_format_gsm, ast_format_ilbc, ast_format_lpc10, ast_format_slin, ast_format_speex, ast_format_ulaw, DAHDI_FORMAT_ADPCM, DAHDI_FORMAT_ALAW, DAHDI_FORMAT_G723_1, DAHDI_FORMAT_G726, DAHDI_FORMAT_G729A, DAHDI_FORMAT_GSM, DAHDI_FORMAT_ILBC, DAHDI_FORMAT_LPC10, DAHDI_FORMAT_SLINEAR, DAHDI_FORMAT_SPEEX, DAHDI_FORMAT_ULAW, and NULL.

Referenced by dahdi_translate().

dahdi_new()

static int dahdi_new ( struct ast_trans_pvt *  pvt )

static

Definition at line 682 of file codec_dahdi.c.

{
    struct translator *zt = container_of(pvt->t, struct translator, t);
 
    return dahdi_translate(pvt, zt->dst_dahdi_fmt, zt->src_dahdi_fmt);
}

References container_of, dahdi_translate(), translator::dst_dahdi_fmt, translator::src_dahdi_fmt, translator::t, and ast_trans_pvt::t.

Referenced by register_translator().

dahdi_translate()

static int dahdi_translate ( struct ast_trans_pvt *  pvt, uint32_t  dst_dahdi_fmt, uint32_t  src_dahdi_fmt  )

static

Definition at line 611 of file codec_dahdi.c.

{
    /* Request translation through zap if possible */
    int fd;
    struct codec_dahdi_pvt *dahdip = pvt->pvt;
    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 = src_dahdi_fmt;
    dahdip->fmts.dstfmt = dst_dahdi_fmt;
 
    ast_assert(pvt->f.subclass.format == NULL);
    pvt->f.subclass.format = ao2_bump(dahdi_format_to_cached(dahdip->fmts.dstfmt));
 
    ast_debug(1, "Opening transcoder channel from %s to %s.\n", pvt->t->src_codec.name, pvt->t->dst_codec.name);
 
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 (dahdip->fmts.srcfmt == DAHDI_FORMAT_SLINEAR) {
                ast_debug(1, "Using soft_slin support on source\n");
                dahdip->softslin = 1;
                dahdip->fmts.srcfmt = DAHDI_FORMAT_ULAW;
            } else if (dahdip->fmts.dstfmt == DAHDI_FORMAT_SLINEAR) {
                ast_debug(1, "Using soft_slin support on destination\n");
                dahdip->softslin = 1;
                dahdip->fmts.dstfmt = DAHDI_FORMAT_ULAW;
            }
            tried_once = 1;
            goto retry;
        }
        ast_log(LOG_ERROR, "Unable to attach to transcoder: %s\n", strerror(errno));
        close(fd);
 
        return -1;
    }
 
    ast_fd_set_flags(fd, O_NONBLOCK);
 
    dahdip->fd = fd;
 
    dahdip->required_samples = ((dahdip->fmts.dstfmt|dahdip->fmts.srcfmt) & (DAHDI_FORMAT_G723_1)) ? G723_SAMPLES : G729_SAMPLES;
 
    switch (dahdip->fmts.dstfmt) {
    case DAHDI_FORMAT_G729A:
        ast_atomic_fetchadd_int(&channels.encoders, +1);
        break;
    case DAHDI_FORMAT_G723_1:
        ast_atomic_fetchadd_int(&channels.encoders, +1);
        break;
    default:
        ast_atomic_fetchadd_int(&channels.decoders, +1);
        break;
    }
 
    return 0;
}

References ao2_bump, ast_assert, ast_atomic_fetchadd_int(), ast_debug, ast_fd_set_flags, ast_log, channels, DAHDI_FORMAT_G723_1, DAHDI_FORMAT_G729A, DAHDI_FORMAT_SLINEAR, dahdi_format_to_cached(), DAHDI_FORMAT_ULAW, channel_usage::decoders, ast_translator::dst_codec, channel_usage::encoders, errno, ast_trans_pvt::f, codec_dahdi_pvt::fd, codec_dahdi_pvt::fmts, ast_frame_subclass::format, G723_SAMPLES, G729_SAMPLES, LOG_ERROR, ast_codec::name, NULL, ast_trans_pvt::pvt, codec_dahdi_pvt::required_samples, codec_dahdi_pvt::softslin, ast_translator::src_codec, ast_frame::subclass, and ast_trans_pvt::t.

Referenced by dahdi_new().

dahdi_wait_for_packet()

static void dahdi_wait_for_packet ( int  fd )

static

Definition at line 417 of file codec_dahdi.c.

{
    struct pollfd p = {0};
    p.fd = fd;
    p.events = POLLIN;
    poll(&p, 1, 10);
}

Referenced by dahdi_decoder_frameout(), and dahdi_encoder_frameout().

dahdi_write_frame()

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

static

Definition at line 359 of file codec_dahdi.c.

{
    int res;
    if (!count) return;
    res = write(dahdip->fd, buffer, count);
    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);
    }
}

References ast_log, errno, codec_dahdi_pvt::fd, and LOG_ERROR.

Referenced by dahdi_decoder_framein(), and dahdi_encoder_framein().

fakesrc_sample()

static struct ast_frame * fakesrc_sample ( void  )

static

Definition at line 689 of file codec_dahdi.c.

{
    /* 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;
}

References AST_FRAME_VOICE, and ast_frame::frametype.

Referenced by register_translator().

find_transcoders()

static int find_transcoders ( void  )

static

Definition at line 807 of file codec_dahdi.c.

{
    struct dahdi_transcoder_info info = { 0, };
    int fd;
 
    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; !ioctl(fd, DAHDI_TC_GETINFO, &info); info.tcnum++) {
        ast_verb(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 & (DAHDI_FORMAT_ULAW | DAHDI_FORMAT_ALAW)) {
            info.dstfmts |= DAHDI_FORMAT_SLINEAR;
            info.dstfmts &= ~(DAHDI_FORMAT_ULAW | DAHDI_FORMAT_ALAW);
        }
        if (info.srcfmts & (DAHDI_FORMAT_ULAW | DAHDI_FORMAT_ALAW)) {
            info.srcfmts |= DAHDI_FORMAT_SLINEAR;
            info.srcfmts &= ~(DAHDI_FORMAT_ULAW | DAHDI_FORMAT_ALAW);
        }
 
        build_translators(info.dstfmts, info.srcfmts);
        ast_atomic_fetchadd_int(&channels.total, info.numchannels / 2);
    }
 
    close(fd);
 
    if (!info.tcnum) {
        ast_verb(2, "No hardware transcoders found.\n");
    }
 
    return 0;
}

References ast_atomic_fetchadd_int(), ast_log, ast_verb, build_translators(), channels, DAHDI_FORMAT_ALAW, DAHDI_FORMAT_SLINEAR, DAHDI_FORMAT_ULAW, errno, LOG_ERROR, and channel_usage::total.

Referenced by load_module().

get_dahdi_codec()

static const struct ast_codec * get_dahdi_codec ( uint32_t  dahdi_fmt )

static

Definition at line 161 of file codec_dahdi.c.

{
    const struct ast_codec *codec;
 
    static const struct ast_codec dahdi_g723_1 = {
        .name = "g723",
        .type = AST_MEDIA_TYPE_AUDIO,
        .sample_rate = 8000,
    };
    static const struct ast_codec dahdi_gsm = {
        .name = "gsm",
        .type = AST_MEDIA_TYPE_AUDIO,
        .sample_rate = 8000,
    };
    static const struct ast_codec dahdi_ulaw = {
        .name = "ulaw",
        .type = AST_MEDIA_TYPE_AUDIO,
        .sample_rate = 8000,
    };
    static const struct ast_codec dahdi_alaw = {
        .name = "alaw",
        .type = AST_MEDIA_TYPE_AUDIO,
        .sample_rate = 8000,
    };
    static const struct ast_codec dahdi_g726 = {
        .name = "g726",
        .type = AST_MEDIA_TYPE_AUDIO,
        .sample_rate = 8000,
    };
    static const struct ast_codec dahdi_adpcm = {
        .name = "adpcm",
        .type = AST_MEDIA_TYPE_AUDIO,
        .sample_rate = 8000,
    };
    static const struct ast_codec dahdi_slinear = {
        .name = "slin",
        .type = AST_MEDIA_TYPE_AUDIO,
        .sample_rate = 8000,
    };
    static const struct ast_codec dahdi_lpc10 = {
        .name = "lpc10",
        .type = AST_MEDIA_TYPE_AUDIO,
        .sample_rate = 8000,
    };
    static const struct ast_codec dahdi_g729a = {
        .name = "g729",
        .type = AST_MEDIA_TYPE_AUDIO,
        .sample_rate = 8000,
    };
    static const struct ast_codec dahdi_speex = {
        .name = "speex",
        .type = AST_MEDIA_TYPE_AUDIO,
        .sample_rate = 8000,
    };
    static const struct ast_codec dahdi_ilbc = {
        .name = "ilbc",
        .type = AST_MEDIA_TYPE_AUDIO,
        .sample_rate = 8000,
    };
 
    switch (dahdi_fmt) {
    case DAHDI_FORMAT_G723_1:
        codec = &dahdi_g723_1;
        break;
    case DAHDI_FORMAT_GSM:
        codec = &dahdi_gsm;
        break;
    case DAHDI_FORMAT_ULAW:
        codec = &dahdi_ulaw;
        break;
    case DAHDI_FORMAT_ALAW:
        codec = &dahdi_alaw;
        break;
    case DAHDI_FORMAT_G726:
        codec = &dahdi_g726;
        break;
    case DAHDI_FORMAT_ADPCM:
        codec = &dahdi_adpcm;
        break;
    case DAHDI_FORMAT_SLINEAR:
        codec = &dahdi_slinear;
        break;
    case DAHDI_FORMAT_LPC10:
        codec = &dahdi_lpc10;
        break;
    case DAHDI_FORMAT_G729A:
        codec = &dahdi_g729a;
        break;
    case DAHDI_FORMAT_SPEEX:
        codec = &dahdi_speex;
        break;
    case DAHDI_FORMAT_ILBC:
        codec = &dahdi_ilbc;
        break;
    default:
        codec = NULL;
        break;
    }
 
    return codec;
}

References AST_MEDIA_TYPE_AUDIO, DAHDI_FORMAT_ADPCM, DAHDI_FORMAT_ALAW, DAHDI_FORMAT_G723_1, DAHDI_FORMAT_G726, DAHDI_FORMAT_G729A, DAHDI_FORMAT_GSM, DAHDI_FORMAT_ILBC, DAHDI_FORMAT_LPC10, DAHDI_FORMAT_SLINEAR, DAHDI_FORMAT_SPEEX, DAHDI_FORMAT_ULAW, ast_codec::name, and NULL.

Referenced by register_translator().

handle_cli_transcoder_show()

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

static

Definition at line 331 of file codec_dahdi.c.

{
    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;
}

References a, ast_cli(), channels, CLI_GENERATE, CLI_INIT, CLI_SHOWUSAGE, CLI_SUCCESS, ast_cli_entry::command, copy(), NULL, and ast_cli_entry::usage.

is_already_registered()

static bool is_already_registered ( uint32_t  dstfmt, uint32_t  srcfmt  )

static

Definition at line 770 of file codec_dahdi.c.

{
    bool res = false;
    const struct translator *zt;
 
    AST_LIST_TRAVERSE(&translators, zt, entry) {
        if ((zt->src_dahdi_fmt == srcfmt) && (zt->dst_dahdi_fmt == dstfmt)) {
            res = true;
            break;
        }
    }
 
    return res;
}

References AST_LIST_TRAVERSE, translator::dst_dahdi_fmt, translator::entry, and translator::src_dahdi_fmt.

Referenced by build_translators().

is_encoder()

static bool is_encoder ( uint32_t  src_dahdi_fmt )

static

Definition at line 701 of file codec_dahdi.c.

{
    return ((src_dahdi_fmt & (DAHDI_FORMAT_ULAW | DAHDI_FORMAT_ALAW | DAHDI_FORMAT_SLINEAR)) > 0);
}

References DAHDI_FORMAT_ALAW, DAHDI_FORMAT_SLINEAR, and DAHDI_FORMAT_ULAW.

Referenced by register_translator().

lintoulaw()

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

static

Definition at line 311 of file codec_dahdi.c.

{
    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;
}

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.

load_module()

static int load_module ( void  )

static

Definition at line 861 of file codec_dahdi.c.

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

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

register_translator()

static int register_translator ( uint32_t  dst_dahdi_fmt, uint32_t  src_dahdi_fmt  )

static

Definition at line 707 of file codec_dahdi.c.

{
    const struct ast_codec *dst_codec;
    const struct ast_codec *src_codec;
    struct translator *zt;
    int res;
 
    dst_codec = get_dahdi_codec(dst_dahdi_fmt);
    src_codec = get_dahdi_codec(src_dahdi_fmt);
    if (!dst_codec || !src_codec) {
        return -1;
    }
 
    if (!(zt = ast_calloc(1, sizeof(*zt)))) {
        return -1;
    }
 
    zt->src_dahdi_fmt = src_dahdi_fmt;
    zt->dst_dahdi_fmt = dst_dahdi_fmt;
 
    snprintf(zt->t.name, sizeof(zt->t.name), "dahdi_%s_to_%s",
        src_codec->name, dst_codec->name);
 
    memcpy(&zt->t.src_codec, src_codec, sizeof(*src_codec));
    memcpy(&zt->t.dst_codec, dst_codec, sizeof(*dst_codec));
    zt->t.buf_size = BUFFER_SIZE;
    if (is_encoder(src_dahdi_fmt)) {
        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_INSERT_HEAD(&translators, zt, entry);
 
    return res;
}

References ast_calloc, ast_free, AST_LIST_INSERT_HEAD, 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::dst_codec, translator::dst_dahdi_fmt, fakesrc_sample(), ast_translator::framein, ast_translator::frameout, get_dahdi_codec(), is_encoder(), ast_codec::name, ast_translator::name, ast_translator::native_plc, ast_translator::newpvt, ast_translator::sample, ast_translator::src_codec, translator::src_dahdi_fmt, and translator::t.

Referenced by build_translators().

reload()

static int reload ( void  )

static

Definition at line 848 of file codec_dahdi.c.

{
    return AST_MODULE_LOAD_SUCCESS;
}

References AST_MODULE_LOAD_SUCCESS.

ulawtolin()

static int ulawtolin ( struct ast_trans_pvt *  pvt, int  samples  )

static

Definition at line 295 of file codec_dahdi.c.

{
    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;
}

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.

unload_module()

static int unload_module ( void  )

static

Definition at line 853 of file codec_dahdi.c.

{
    ast_cli_unregister_multiple(cli, ARRAY_LEN(cli));
    unregister_translators();
 
    return 0;
}

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

unregister_translators()

static void unregister_translators ( void  )

static

Definition at line 757 of file codec_dahdi.c.

{
    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);
}

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().

Variable Documentation

__mod_info

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

static

Definition at line 873 of file codec_dahdi.c.

ast_module_info

const struct ast_module_info* ast_module_info = &__mod_info

static

Definition at line 873 of file codec_dahdi.c.

channels

struct channel_usage channels

static

Referenced by action_coreshowchannels(), action_dahdishowchannels(), action_status(), app_to_json(), ast_bridge_peers(), ast_bridge_peers_nolock(), ast_bridge_transfer_attended(), ast_bridge_transfer_blind(), broadcast_exec(), channels_scrape_cb(), check_header(), control_list_create(), dahdi_destroy(), dahdi_translate(), do_broadcast(), find_transcoders(), get_transferee(), handle_chanlist(), handle_cli_transcoder_show(), main(), manage_calls(), set_transfer_variables_all(), stasis_app_to_cli(), and two_bridge_attended_transfer().

cli

struct ast_cli_entry cli[]

static

Initial value:

= {
    { .handler =  handle_cli_transcoder_show , .summary =  "Display DAHDI transcoder utilization." ,}
}

Definition at line 265 of file codec_dahdi.c.

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

Referenced by cli_complete_subscription_callid(), cli_complete_subscription_common(), cli_list_subscriptions_detail(), cli_list_subscriptions_inout(), cli_show_subscription_common(), cli_show_subscription_inout(), cli_show_subscriptions_detail(), cli_show_subscriptions_inout(), load_module(), and unload_module().

translators

struct translators translators = AST_LIST_HEAD_INIT_VALUE

static