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Gustaf Ullberg

2019-Apr-01 10:37 UTC

[opus] API for checking whether the encoder is in DTX (PR #107)

Hi everyone,

Some time ago, I sent a pull request
<https://github.com/xiph/opus/pull/107>
to the Opus github page. Jean-Marc asked me to post it to the mailing list
so everyone can have a look at it.

You can find the description and code changes below. Please let me know if
you have any questions or concerns.

Best regards
Gustaf Ullberg

In WebRTC, we would like to be able to differentiate between "normal"
frames and the comfort noise update frames that are encoded before and
in-between DTX frames. These CNG update frames could then be flagged for
routing or statistics reasons. Such flagging could also make it easier for
a jitterbuffer to differ DTX from packet loss.

This PR implements an encoder CTL named OPUS_GET_IN_DTX. OPUS_GET_IN_DTX
returns 1 if the last encoded frame was either a DTX frame, or a CNG update
frame that is sent every 420 ms between the DTX frames.

This is achieved by checking if the number of consecutive inactive frames
(nb_no_activity_frames) is greater or equal to NB_SPEECH_FRAMES_BEFORE_DTX.


diff --git a/include/opus_defines.h b/include/opus_defines.h
index fbf5d0eb..e35114e4 100644
--- a/include/opus_defines.h
+++ b/include/opus_defines.h
@@ -168,6 +168,7 @@ extern "C" {
 /* Don't use 4045, it's already taken by OPUS_GET_GAIN_REQUEST */
 #define OPUS_SET_PHASE_INVERSION_DISABLED_REQUEST 4046
 #define OPUS_GET_PHASE_INVERSION_DISABLED_REQUEST 4047
+#define OPUS_GET_IN_DTX_REQUEST              4049

 /** Defines for the presence of extended APIs. */
 #define OPUS_HAVE_OPUS_PROJECTION_H
@@ -715,6 +716,16 @@ extern "C" {
   * </dl>
   * @hideinitializer */
 #define OPUS_GET_PHASE_INVERSION_DISABLED(x)
OPUS_GET_PHASE_INVERSION_DISABLED_REQUEST, __opus_check_int_ptr(x)
+/** Gets the DTX state of the encoder.
+  * Returns wheter the last encoded frame was either a comfort noise update
+  * during DTX or not encoded because of DTX.
+  * @param[out] x <tt>opus_int32 *</tt>: Returns one of the
following
values:
+  * <dl>
+  * <dt>0</dt><dd>The encoder is not in DTX.</dd>
+  * <dt>1</dt><dd>The encoder is in DTX.</dd>
+  * </dl>
+  * @hideinitializer */
+#define OPUS_GET_IN_DTX(x) OPUS_GET_IN_DTX_REQUEST, __opus_check_int_ptr(x)

 /**@}*/

diff --git a/src/opus_encoder.c b/src/opus_encoder.c
index cbeb40ae..0d84737a 100644
--- a/src/opus_encoder.c
+++ b/src/opus_encoder.c
@@ -2725,6 +2725,27 @@ int opus_encoder_ctl(OpusEncoder *st, int request,
...)
             ret = celt_encoder_ctl(celt_enc, OPUS_SET_ENERGY_MASK(value));
         }
         break;
+        case OPUS_GET_IN_DTX_REQUEST:
+        {
+            opus_int32 *value = va_arg(ap, opus_int32*);
+            if (!value)
+            {
+                goto bad_arg;
+            }
+            *value = 0;
+            if (st->silk_mode.useDTX) {
+                /* DTX determined by Silk. */
+                void *silk_enc = (char*)st+st->silk_enc_offset;
+                *value
((silk_encoder*)silk_enc)->state_Fxx[0].sCmn.noSpeechCounter
>NB_SPEECH_FRAMES_BEFORE_DTX;
+            }
+#ifndef DISABLE_FLOAT_API
+            else if (st->use_dtx) {
+                /* DTX determined by Opus. */
+                *value = st->nb_no_activity_frames
>NB_SPEECH_FRAMES_BEFORE_DTX;
+            }
+#endif
+        }
+        break;

         case CELT_GET_MODE_REQUEST:
         {
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Mark Harris

2019-Apr-05 09:41 UTC

head link

[opus] API for checking whether the encoder is in DTX (PR #107)

On 2019-04-01 3:37, Gustaf Ullberg wrote:> Hi everyone,
> 
> Some time ago, I sent a pull request
> <https://github.com/xiph/opus/pull/107> to the Opus github page.
> Jean-Marc asked me to post it to the mailing list so everyone can have a
> look at it.
> 
> You can find the description and code changes below. Please let me know
> if you have any questions or concerns.
> 
> Best regards
> Gustaf Ullberg
> 
> In WebRTC, we would like to be able to differentiate between
"normal"
> frames and the comfort noise update frames that are encoded before and
> in-between DTX frames. These CNG update frames could then be flagged for
> routing or statistics reasons. Such flagging could also make it easier
> for a jitterbuffer to differ DTX from packet loss.
> 
> This PR implements an encoder CTL named OPUS_GET_IN_DTX. OPUS_GET_IN_DTX
> returns 1 if the last encoded frame was either a DTX frame, or a CNG
> update frame that is sent every 420 ms between the DTX frames.
> 
> This is achieved by checking if the number of consecutive inactive
> frames (nb_no_activity_frames) is greater or equal to
> NB_SPEECH_FRAMES_BEFORE_DTX.
> 
> 
> diff --git a/include/opus_defines.h b/include/opus_defines.h
> index fbf5d0eb..e35114e4 100644
> --- a/include/opus_defines.h
> +++ b/include/opus_defines.h
> @@ -168,6 +168,7 @@ extern "C" {
>  /* Don't use 4045, it's already taken by OPUS_GET_GAIN_REQUEST */
>  #define OPUS_SET_PHASE_INVERSION_DISABLED_REQUEST 4046
>  #define OPUS_GET_PHASE_INVERSION_DISABLED_REQUEST 4047
> +#define OPUS_GET_IN_DTX_REQUEST              4049
>  
>  /** Defines for the presence of extended APIs. */
>  #define OPUS_HAVE_OPUS_PROJECTION_H
> @@ -715,6 +716,16 @@ extern "C" {
>    * </dl>
>    * @hideinitializer */
>  #define OPUS_GET_PHASE_INVERSION_DISABLED(x)
> OPUS_GET_PHASE_INVERSION_DISABLED_REQUEST, __opus_check_int_ptr(x)
> +/** Gets the DTX state of the encoder.
> +  * Returns wheter the last encoded frame was either a comfort noise
update

s/wheter/whether/

> +  * during DTX or not encoded because of DTX.
> +  * @param[out] x <tt>opus_int32 *</tt>: Returns one of the
following
> values:
> +  * <dl>
> +  * <dt>0</dt><dd>The encoder is not in DTX.</dd>
> +  * <dt>1</dt><dd>The encoder is in DTX.</dd>
> +  * </dl>
> +  * @hideinitializer */
> +#define OPUS_GET_IN_DTX(x) OPUS_GET_IN_DTX_REQUEST,
__opus_check_int_ptr(x)
>  
>  /**@}*/
>  
> diff --git a/src/opus_encoder.c b/src/opus_encoder.c
> index cbeb40ae..0d84737a 100644
> --- a/src/opus_encoder.c
> +++ b/src/opus_encoder.c
> @@ -2725,6 +2725,27 @@ int opus_encoder_ctl(OpusEncoder *st, int
> request, ...)
>              ret = celt_encoder_ctl(celt_enc, OPUS_SET_ENERGY_MASK(value));
>          }
>          break;
> +        case OPUS_GET_IN_DTX_REQUEST:
> +        {
> +            opus_int32 *value = va_arg(ap, opus_int32*);
> +            if (!value)
> +            {
> +                goto bad_arg;
> +            }
> +            *value = 0;
> +            if (st->silk_mode.useDTX) {
> +                /* DTX determined by Silk. */
> +                void *silk_enc = (char*)st+st->silk_enc_offset;
> +                *value >
((silk_encoder*)silk_enc)->state_Fxx[0].sCmn.noSpeechCounter >>
NB_SPEECH_FRAMES_BEFORE_DTX;
> +            }

It looks like this does not have the same behavior as the code that
decides whether to produce a DTX frame.  For example, in the case of
stereo the SILK DTX code considers both channels, but this code looks
only at state_Fxx[0].  Shouldn't the behavior match?

 - Mark


> +#ifndef DISABLE_FLOAT_API
> +            else if (st->use_dtx) {
> +                /* DTX determined by Opus. */
> +                *value = st->nb_no_activity_frames >>
NB_SPEECH_FRAMES_BEFORE_DTX;
> +            }
> +#endif
> +        }
> +        break;
>  
>          case CELT_GET_MODE_REQUEST:
>          {
> 
>

Gustaf Ullberg

2019-Apr-08 11:55 UTC

head link

[opus] API for checking whether the encoder is in DTX (PR #107)

Thank you Mark.

I agree and have now updated the pull request with a new commit, addressing
your comments.
Please take a look.

/Gustaf

On Fri, 5 Apr 2019 at 11:41, Mark Harris <mark.hsj at gmail.com> wrote:
> On 2019-04-01 3:37, Gustaf Ullberg wrote:
> > Hi everyone,
> >
> > Some time ago, I sent a pull request
> > <https://github.com/xiph/opus/pull/107> to the Opus github page.
> > Jean-Marc asked me to post it to the mailing list so everyone can have
a
> > look at it.
> >
> > You can find the description and code changes below. Please let me
know
> > if you have any questions or concerns.
> >
> > Best regards
> > Gustaf Ullberg
> >
> > In WebRTC, we would like to be able to differentiate between
"normal"
> > frames and the comfort noise update frames that are encoded before and
> > in-between DTX frames. These CNG update frames could then be flagged
for
> > routing or statistics reasons. Such flagging could also make it easier
> > for a jitterbuffer to differ DTX from packet loss.
> >
> > This PR implements an encoder CTL named OPUS_GET_IN_DTX.
OPUS_GET_IN_DTX
> > returns 1 if the last encoded frame was either a DTX frame, or a CNG
> > update frame that is sent every 420 ms between the DTX frames.
> >
> > This is achieved by checking if the number of consecutive inactive
> > frames (nb_no_activity_frames) is greater or equal to
> > NB_SPEECH_FRAMES_BEFORE_DTX.
> >
> >
> > diff --git a/include/opus_defines.h b/include/opus_defines.h
> > index fbf5d0eb..e35114e4 100644
> > --- a/include/opus_defines.h
> > +++ b/include/opus_defines.h
> > @@ -168,6 +168,7 @@ extern "C" {
> >  /* Don't use 4045, it's already taken by
OPUS_GET_GAIN_REQUEST */
> >  #define OPUS_SET_PHASE_INVERSION_DISABLED_REQUEST 4046
> >  #define OPUS_GET_PHASE_INVERSION_DISABLED_REQUEST 4047
> > +#define OPUS_GET_IN_DTX_REQUEST              4049
> >
> >  /** Defines for the presence of extended APIs. */
> >  #define OPUS_HAVE_OPUS_PROJECTION_H
> > @@ -715,6 +716,16 @@ extern "C" {
> >    * </dl>
> >    * @hideinitializer */
> >  #define OPUS_GET_PHASE_INVERSION_DISABLED(x)
> > OPUS_GET_PHASE_INVERSION_DISABLED_REQUEST, __opus_check_int_ptr(x)
> > +/** Gets the DTX state of the encoder.
> > +  * Returns wheter the last encoded frame was either a comfort noise
> update
>
>
> s/wheter/whether/
>
>
> > +  * during DTX or not encoded because of DTX.
> > +  * @param[out] x <tt>opus_int32 *</tt>: Returns one of
the following
> > values:
> > +  * <dl>
> > +  * <dt>0</dt><dd>The encoder is not in
DTX.</dd>
> > +  * <dt>1</dt><dd>The encoder is in DTX.</dd>
> > +  * </dl>
> > +  * @hideinitializer */
> > +#define OPUS_GET_IN_DTX(x) OPUS_GET_IN_DTX_REQUEST,
> __opus_check_int_ptr(x)
> >
> >  /**@}*/
> >
> > diff --git a/src/opus_encoder.c b/src/opus_encoder.c
> > index cbeb40ae..0d84737a 100644
> > --- a/src/opus_encoder.c
> > +++ b/src/opus_encoder.c
> > @@ -2725,6 +2725,27 @@ int opus_encoder_ctl(OpusEncoder *st, int
> > request, ...)
> >              ret = celt_encoder_ctl(celt_enc,
> OPUS_SET_ENERGY_MASK(value));
> >          }
> >          break;
> > +        case OPUS_GET_IN_DTX_REQUEST:
> > +        {
> > +            opus_int32 *value = va_arg(ap, opus_int32*);
> > +            if (!value)
> > +            {
> > +                goto bad_arg;
> > +            }
> > +            *value = 0;
> > +            if (st->silk_mode.useDTX) {
> > +                /* DTX determined by Silk. */
> > +                void *silk_enc = (char*)st+st->silk_enc_offset;
> > +                *value > >
((silk_encoder*)silk_enc)->state_Fxx[0].sCmn.noSpeechCounter >> >
NB_SPEECH_FRAMES_BEFORE_DTX;
> > +            }
>
>
> It looks like this does not have the same behavior as the code that
> decides whether to produce a DTX frame.  For example, in the case of
> stereo the SILK DTX code considers both channels, but this code looks
> only at state_Fxx[0].  Shouldn't the behavior match?
>
>  - Mark
>
>
>
> > +#ifndef DISABLE_FLOAT_API
> > +            else if (st->use_dtx) {
> > +                /* DTX determined by Opus. */
> > +                *value = st->nb_no_activity_frames >> >
NB_SPEECH_FRAMES_BEFORE_DTX;
> > +            }
> > +#endif
> > +        }
> > +        break;
> >
> >          case CELT_GET_MODE_REQUEST:
> >          {
> >
> >
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