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set mod_dahdi_codec dahdi transcoding device sockets to non-blocking to avoid hanging when there is no data and just return 0 bytes frame 

Jira: MODCODEC-8


git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@13257 d0543943-73ff-0310-b7d9-9358b9ac24b2
This commit is contained in:
Moises Silva 2009-05-08 01:25:39 +00:00
parent ffe00a236b
commit 8653e621d5
1 changed files with 77 additions and 12 deletions
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89
src/mod/codecs/mod_dahdi_codec/mod_dahdi_codec.c
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@ -32,8 +32,12 @@
#include <switch.h>
#include <g711.h>
#include <poll.h>
#include <linux/types.h> /* __u32 */
#include <sys/ioctl.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
/*#define DEBUG_DAHDI_CODEC 1*/
@ -91,6 +95,7 @@ struct dahdi_context {
static int32_t switch_dahdi_get_transcoder(struct dahdi_transcoder_formats *fmts)
{
int32_t fdflags;
int32_t fd = open(transcoding_device, O_RDWR);
if (fd < 0) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR,
@ -105,6 +110,21 @@ static int32_t switch_dahdi_get_transcoder(struct dahdi_transcoder_formats *fmts
close(fd);
return -1;
}
fdflags = fcntl(fd, F_GETFL);
if (fdflags > -1) {
fdflags |= O_NONBLOCK;
if (fcntl(fd, F_SETFL, fdflags)) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Could not set non-block mode in %s transcoder FD: %s\n",
transcoder_name, strerror(errno));
/* should we abort? this may cause channels to hangup when overruning the device
* see jira dahdi codec issue MODCODEC-8 (Hung Calls and Codec DAHDI G.729A 8.0k decoder error!)
* */
}
} else {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Could not get flags from %s transcoder FD: %s\n",
transcoder_name, strerror(errno));
}
if (fmts->srcfmt & DAHDI_FORMAT_ULAW) {
switch_mutex_lock(transcoder_counter_mutex);
total_encoders_usage++;
@ -114,6 +134,7 @@ static int32_t switch_dahdi_get_transcoder(struct dahdi_transcoder_formats *fmts
total_decoders_usage++;
switch_mutex_unlock(transcoder_counter_mutex);
}
return fd;
}
@ -194,13 +215,28 @@ static switch_status_t switch_dahdi_init(switch_codec_t *codec, switch_codec_fla
context->encoding_fd = -1;
context->decoding_fd = -1;
/* ulaw requires 8 times more storage than g729 and 12 times more than G723, right? */
/* ulaw requires 8 times more storage than g729 and 12 times more than G723, right?
* this can be used to calculate the target buffer when encoding and decoding
* */
context->codec_r = (codec->implementation->ianacode == CODEC_G729_IANA_CODE)
? 8 : 12;
return SWITCH_STATUS_SUCCESS;
}
static int wait_for_transcoder(int fd)
{
/* let's wait a bit for the transcoder, if in 20msthe driver does not notify us that its ready to accept more works
then just bail out with 0 bytes encoded/decoded as result, I'd expect the card to hold that buffer and return it later */
int res = 0;
struct pollfd readpoll;
memset(&readpoll, 0, sizeof(readpoll));
readpoll.fd = fd;
readpoll.events = POLLOUT;
res = poll(&readpoll, 1, 50);
return res;
}
static switch_status_t switch_dahdi_encode(switch_codec_t *codec,
switch_codec_t *other_codec,
void *decoded_data,
@ -244,12 +280,26 @@ static switch_status_t switch_dahdi_encode(switch_codec_t *codec,
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Requested to write %d bytes to %s encoder device, but only wrote %d bytes.\n", i, transcoder_name, res);
return SWITCH_STATUS_FALSE;
}
#ifdef DEBUG_DAHDI_CODEC
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "Wrote %d bytes of decoded ulaw data.\n", res);
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "Attempting to read %d bytes of encoded data.\n", i/context->codec_r);
#endif
res = read(context->encoding_fd, encoded_data, i/context->codec_r);
res = wait_for_transcoder(context->encoding_fd);
if (-1 == res) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Failed to poll on %s encoder device: %s.\n", transcoder_name, strerror(errno));
return SWITCH_STATUS_FALSE;
}
if (0 == res) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "No output on %s encoder device.\n", transcoder_name);
*encoded_data_len = 0;
return SWITCH_STATUS_SUCCESS;
}
#ifdef DEBUG_DAHDI_CODEC
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "Attempting to read %d bytes of encoded data.\n", *encoded_data_len);
#endif
res = read(context->encoding_fd, encoded_data, *encoded_data_len);
if (-1 == res) {
if (EAGAIN == errno || EWOULDBLOCK == errno) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "No output on %s encoder device (%s).\n", transcoder_name, strerror(errno));
*encoded_data_len = 0;
return SWITCH_STATUS_SUCCESS;
}
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Failed to read from %s encoder device: %s.\n", transcoder_name, strerror(errno));
return SWITCH_STATUS_FALSE;
}
@ -269,7 +319,8 @@ static switch_status_t switch_dahdi_decode(switch_codec_t *codec,
{
int32_t res;
short *dbuf_linear;
unsigned char dbuf_ulaw[encoded_data_len * ((struct dahdi_context*)codec->private_info)->codec_r];
// we only can decode up to half ulaw bytes of whatever their destiny linear buffer is
unsigned char dbuf_ulaw[*decoded_data_len/2];
unsigned char *ebuf_g729;
uint32_t i;
struct dahdi_context *context;
@ -302,7 +353,7 @@ static switch_status_t switch_dahdi_decode(switch_codec_t *codec,
#endif
res = write(context->decoding_fd, ebuf_g729, encoded_data_len);
if (-1 == res) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Failed to write to %s decoder device.\n", transcoder_name);
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Failed to write to %s decoder device: %s.\n", transcoder_name, strerror(errno));
return SWITCH_STATUS_FALSE;
}
if (encoded_data_len != res) {
@ -310,13 +361,27 @@ static switch_status_t switch_dahdi_decode(switch_codec_t *codec,
return SWITCH_STATUS_FALSE;
}
#ifdef DEBUG_DAHDI_CODEC
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "Wrote %d bytes to decode.\n", res);
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "Attempting to read from device %d bytes of decoded ulaw data.\n",
encoded_data_len*context->codec_r);
sizeof(dbuf_ulaw));
#endif
res = read(context->decoding_fd, dbuf_ulaw, encoded_data_len*context->codec_r);
res = wait_for_transcoder(context->decoding_fd);
if (-1 == res) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Failed to read from %s encoder device: %s.\n", transcoder_name, strerror(errno));
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Failed to poll on %s decoder device: %s.\n", transcoder_name, strerror(errno));
return SWITCH_STATUS_FALSE;
}
if (0 == res) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "No output on %s decoder device.\n", transcoder_name);
*decoded_data_len = 0;
return SWITCH_STATUS_SUCCESS;
}
res = read(context->decoding_fd, dbuf_ulaw, sizeof(dbuf_ulaw));
if (-1 == res) {
if (EAGAIN == errno || EWOULDBLOCK == errno) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "No output on %s decoder device (%s).\n", transcoder_name, strerror(errno));
*decoded_data_len = 0;
return SWITCH_STATUS_SUCCESS;
}
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Failed to read from %s decoder device: %s.\n", transcoder_name, strerror(errno));
return SWITCH_STATUS_FALSE;
}
for (i = 0; i < res; i++) {