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Michael Graczyk

2016-Apr-26 04:31 UTC

[opus] [opus-tools] [PATCH] Add channel-mapping argument to force channel mapping

This patch adds a new option "channel-mapping" to opusenc which sets
the channel mapping family used by the multistream encoder. Please let
me know whether adding this option is worthwhile and whether the help
string is okay. I tried to keep it short but accurate.

The error message for an unimplemented channel mapping is "Error
cannot create encoder: request not implemented". I do not think that
is descriptive enough, but I also do not know of a way to determine
which channel mapping families are supported by the multistream
encoder. If we hard-code valid channel mappings {0, 1, 255}, opusenc
will need to be updated when channel mappings are added to Opus.

With this patch, you can encode four streams independently with
$ opusenc --channel-mapping 255 in.wav out.opus

When channel mapping families are added to Opus in the future
(ambisonics, for example), this option will make it possible to use
them.

---
 src/opusenc.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/src/opusenc.c b/src/opusenc.c
index 0f83194..f2c7c48 100644
--- a/src/opusenc.c
+++ b/src/opusenc.c
@@ -137,6 +137,8 @@ void usage(void)
   printf(" --framesize n      Maximum frame size in milliseconds\n");
   printf("                      (2.5, 5, 10, 20, 40, 60, default:
20)\n");
   printf(" --expect-loss      Percentage packet loss to expect
(default: 0)\n");
+  printf(" --channel-mapping  Channel Mapping Family\n");
+  printf("                      (default: {0, 1, 255} for {1-2, 3-8,
9+} channels)\n");
   printf(" --downmix-mono     Downmix to mono\n");
   printf(" --downmix-stereo   Downmix to stereo (if >2
channels)\n");
   printf(" --max-delay n      Maximum container delay in
milliseconds\n");
@@ -260,6 +262,7 @@ int main(int argc, char **argv)
     {"complexity", required_argument, NULL, 0},
     {"framesize", required_argument, NULL, 0},
     {"expect-loss", required_argument, NULL, 0},
+    {"channel-mapping", required_argument, NULL, 0},
     {"downmix-mono",no_argument,NULL, 0},
     {"downmix-stereo",no_argument,NULL, 0},
     {"no-downmix",no_argument,NULL, 0},
@@ -337,6 +340,7 @@ int main(int argc, char **argv)
   opus_int32         coding_rate=48000;
   opus_int32         frame_size=960;
   int                chan=2;
+  int                channel_mapping=-1;
   int                with_hard_cbr=0;
   int                with_cvbr=0;
   int                expect_loss=0;
@@ -465,6 +469,12 @@ int main(int argc, char **argv)
             fprintf(stderr,"Expected loss is a percent and must be
0-100.\n");
             exit(1);
           }
+        }else
if(strcmp(long_options[option_index].name,"channel-mapping")==0){
+          channel_mapping=atoi(optarg);
+          if(channel_mapping < 0 || channel_mapping > 255){
+            fprintf(stderr,"Invalid channel-mapping: %s\n",optarg);
+            exit(1);
+          }
         }else if(strcmp(long_options[option_index].name,"comp")==0 ||
                 
strcmp(long_options[option_index].name,"complexity")==0){
           complexity=atoi(optarg);
@@ -692,7 +702,11 @@ int main(int argc, char **argv)

   /*OggOpus headers*/ /*FIXME: broke forcemono*/
   header.channels=chan;
-  header.channel_mapping=header.channels>8?255:chan>2;
+  if (channel_mapping >= 0) {
+     header.channel_mapping = channel_mapping;
+  } else {
+     header.channel_mapping = header.channels > 8 ? 255 : header.channels
> 2;
+  }
   header.input_sample_rate=rate;
   header.gain=inopt.gain;

-- 

Thanks,
Michael Graczyk

Ulrich Windl

2016-Apr-26 06:45 UTC

head link

[opus] Antw: [opus-tools] [PATCH] Add channel-mapping argument to force channel mapping

Hi!

I haven't looked into the code yet, but the patch uses different coding
conventions like "if(" and "if ("; like wise "){"
and ") {". My personal taste is to have spaces after keywords, but
that's just me.

I'd prefer a consistent coding style.

Regards,
Ulrich
>>> Michael Graczyk <mgraczyk at google.com> schrieb am
26.04.2016 um 06:31 inNachricht
<CABcu6-gnkPHY0d8rqDie8z5OZ+WH6eb0P+k6bPit2H8i5RrS1w at
mail.gmail.com>:> This patch adds a new option "channel-mapping" to opusenc which
sets
> the channel mapping family used by the multistream encoder. Please let
> me know whether adding this option is worthwhile and whether the help
> string is okay. I tried to keep it short but accurate.
> 
> The error message for an unimplemented channel mapping is "Error
> cannot create encoder: request not implemented". I do not think that
> is descriptive enough, but I also do not know of a way to determine
> which channel mapping families are supported by the multistream
> encoder. If we hard-code valid channel mappings {0, 1, 255}, opusenc
> will need to be updated when channel mappings are added to Opus.
> 
> With this patch, you can encode four streams independently with
> $ opusenc --channel-mapping 255 in.wav out.opus
> 
> When channel mapping families are added to Opus in the future
> (ambisonics, for example), this option will make it possible to use
> them.
> 
> ---
>  src/opusenc.c | 16 +++++++++++++++-
>  1 file changed, 15 insertions(+), 1 deletion(-)
> 
> diff --git a/src/opusenc.c b/src/opusenc.c
> index 0f83194..f2c7c48 100644
> --- a/src/opusenc.c
> +++ b/src/opusenc.c
> @@ -137,6 +137,8 @@ void usage(void)
>    printf(" --framesize n      Maximum frame size in
milliseconds\n");
>    printf("                      (2.5, 5, 10, 20, 40, 60, default:
20)\n");
>    printf(" --expect-loss      Percentage packet loss to expect
> (default: 0)\n");
> +  printf(" --channel-mapping  Channel Mapping Family\n");
> +  printf("                      (default: {0, 1, 255} for {1-2, 3-8,
> 9+} channels)\n");
>    printf(" --downmix-mono     Downmix to mono\n");
>    printf(" --downmix-stereo   Downmix to stereo (if >2
channels)\n");
>    printf(" --max-delay n      Maximum container delay in
milliseconds\n");
> @@ -260,6 +262,7 @@ int main(int argc, char **argv)
>      {"complexity", required_argument, NULL, 0},
>      {"framesize", required_argument, NULL, 0},
>      {"expect-loss", required_argument, NULL, 0},
> +    {"channel-mapping", required_argument, NULL, 0},
>      {"downmix-mono",no_argument,NULL, 0},
>      {"downmix-stereo",no_argument,NULL, 0},
>      {"no-downmix",no_argument,NULL, 0},
> @@ -337,6 +340,7 @@ int main(int argc, char **argv)
>    opus_int32         coding_rate=48000;
>    opus_int32         frame_size=960;
>    int                chan=2;
> +  int                channel_mapping=-1;
>    int                with_hard_cbr=0;
>    int                with_cvbr=0;
>    int                expect_loss=0;
> @@ -465,6 +469,12 @@ int main(int argc, char **argv)
>              fprintf(stderr,"Expected loss is a percent and must be 
> 0-100.\n");
>              exit(1);
>            }
> +        }else 
> if(strcmp(long_options[option_index].name,"channel-mapping")==0){
> +          channel_mapping=atoi(optarg);
> +          if(channel_mapping < 0 || channel_mapping > 255){
> +            fprintf(stderr,"Invalid channel-mapping:
%s\n",optarg);
> +            exit(1);
> +          }
>          }else
if(strcmp(long_options[option_index].name,"comp")==0 ||
>                  
strcmp(long_options[option_index].name,"complexity")==0){
>            complexity=atoi(optarg);
> @@ -692,7 +702,11 @@ int main(int argc, char **argv)
> 
>    /*OggOpus headers*/ /*FIXME: broke forcemono*/
>    header.channels=chan;
> -  header.channel_mapping=header.channels>8?255:chan>2;
> +  if (channel_mapping >= 0) {
> +     header.channel_mapping = channel_mapping;
> +  } else {
> +     header.channel_mapping = header.channels > 8 ? 255 :
header.channels >
> 2;
> +  }
>    header.input_sample_rate=rate;
>    header.gain=inopt.gain;
> 
> -- 
> 
> Thanks,
> Michael Graczyk
> _______________________________________________
> opus mailing list
> opus at xiph.org 
> http://lists.xiph.org/mailman/listinfo/opus

Jean-Marc Valin

2016-Apr-26 06:55 UTC

head link

[opus] Antw: [opus-tools] [PATCH] Add channel-mapping argument to force channel mapping

On 04/26/2016 02:45 AM, Ulrich Windl wrote:> I haven't looked into the code yet, but the patch uses different
> coding conventions like "if(" and "if ("; like wise
"){" and ") {".
> My personal taste is to have spaces after keywords, but that's just
> me.
> 
> I'd prefer a consistent coding style.
It's up to Greg who's maintaining opus-tools, but Opus has at least 3
different coding styles, so it's hard to be consistent with anything.

	Jean-Marc
> Regards, Ulrich
> 
>>>> Michael Graczyk <mgraczyk at google.com> schrieb am
26.04.2016 um
>>>> 06:31 in
> Nachricht 
> <CABcu6-gnkPHY0d8rqDie8z5OZ+WH6eb0P+k6bPit2H8i5RrS1w at
mail.gmail.com>:
>>
> This patch adds a new option "channel-mapping" to opusenc which
sets>> the channel mapping family used by the multistream encoder. Please
>> let me know whether adding this option is worthwhile and whether
>> the help string is okay. I tried to keep it short but accurate.
>> 
>> The error message for an unimplemented channel mapping is "Error 
>> cannot create encoder: request not implemented". I do not think
>> that is descriptive enough, but I also do not know of a way to
>> determine which channel mapping families are supported by the
>> multistream encoder. If we hard-code valid channel mappings {0, 1,
>> 255}, opusenc will need to be updated when channel mappings are
>> added to Opus.
>> 
>> With this patch, you can encode four streams independently with $
>> opusenc --channel-mapping 255 in.wav out.opus
>> 
>> When channel mapping families are added to Opus in the future 
>> (ambisonics, for example), this option will make it possible to
>> use them.
>> 
>> --- src/opusenc.c | 16 +++++++++++++++- 1 file changed, 15
>> insertions(+), 1 deletion(-)
>> 
>> diff --git a/src/opusenc.c b/src/opusenc.c index 0f83194..f2c7c48
>> 100644 --- a/src/opusenc.c +++ b/src/opusenc.c @@ -137,6 +137,8 @@
>> void usage(void) printf(" --framesize n      Maximum frame size in
>> milliseconds\n"); printf("                      (2.5, 5, 10,
20,
>> 40, 60, default: 20)\n"); printf(" --expect-loss     
Percentage
>> packet loss to expect (default: 0)\n"); +  printf("
>> --channel-mapping  Channel Mapping Family\n"); +  printf("
>> (default: {0, 1, 255} for {1-2, 3-8, 9+} channels)\n");
printf("
>> --downmix-mono     Downmix to mono\n"); printf("
--downmix-stereo
>> Downmix to stereo (if >2 channels)\n"); printf("
--max-delay n
>> Maximum container delay in milliseconds\n"); @@ -260,6 +262,7 @@
>> int main(int argc, char **argv) {"complexity",
required_argument,
>> NULL, 0}, {"framesize", required_argument, NULL, 0}, 
>> {"expect-loss", required_argument, NULL, 0}, +
>> {"channel-mapping", required_argument, NULL, 0}, 
>> {"downmix-mono",no_argument,NULL, 0}, 
>> {"downmix-stereo",no_argument,NULL, 0}, 
>> {"no-downmix",no_argument,NULL, 0}, @@ -337,6 +340,7 @@ int
>> main(int argc, char **argv) opus_int32         coding_rate=48000; 
>> opus_int32         frame_size=960; int                chan=2; +
>> int                channel_mapping=-1; int
>> with_hard_cbr=0; int                with_cvbr=0; int
>> expect_loss=0; @@ -465,6 +469,12 @@ int main(int argc, char
>> **argv) fprintf(stderr,"Expected loss is a percent and must be 
>> 0-100.\n"); exit(1); } +        }else 
>>
if(strcmp(long_options[option_index].name,"channel-mapping")==0){ +
>> channel_mapping=atoi(optarg); +          if(channel_mapping < 0 ||
>> channel_mapping > 255){ +            fprintf(stderr,"Invalid
>> channel-mapping: %s\n",optarg); +            exit(1); +          }
>> }else if(strcmp(long_options[option_index].name,"comp")==0 ||
>> strcmp(long_options[option_index].name,"complexity")==0){ 
>> complexity=atoi(optarg); @@ -692,7 +702,11 @@ int main(int argc,
>> char **argv)
>> 
>> /*OggOpus headers*/ /*FIXME: broke forcemono*/ 
>> header.channels=chan; -
>> header.channel_mapping=header.channels>8?255:chan>2; +  if
>> (channel_mapping >= 0) { +     header.channel_mapping >>
channel_mapping; +  } else { +     header.channel_mapping >>
header.channels > 8 ? 255 : header.channels > 2; +  }
>> header.input_sample_rate=rate; header.gain=inopt.gain;
>> 
>> --
>> 
>> Thanks, Michael Graczyk 
>> _______________________________________________ opus mailing list 
>> opus at xiph.org http://lists.xiph.org/mailman/listinfo/opus
> 
> 
> 
> _______________________________________________ opus mailing list 
> opus at xiph.org http://lists.xiph.org/mailman/listinfo/opus
>

Michael Graczyk

2016-Apr-26 07:07 UTC

head link

[opus] Antw: [opus-tools] [PATCH] Add channel-mapping argument to force channel mapping

Thanks Ulrich for pointing this out. I fixed the whitespace below.

---
 src/opusenc.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/src/opusenc.c b/src/opusenc.c
index 0f83194..458a225 100644
--- a/src/opusenc.c
+++ b/src/opusenc.c
@@ -137,6 +137,8 @@ void usage(void)
   printf(" --framesize n      Maximum frame size in milliseconds\n");
   printf("                      (2.5, 5, 10, 20, 40, 60, default:
20)\n");
   printf(" --expect-loss      Percentage packet loss to expect
(default: 0)\n");
+  printf(" --channel-mapping  Channel Mapping Family\n");
+  printf("                      (default: {0, 1, 255} for {1-2, 3-8,
9+} channels)\n");
   printf(" --downmix-mono     Downmix to mono\n");
   printf(" --downmix-stereo   Downmix to stereo (if >2
channels)\n");
   printf(" --max-delay n      Maximum container delay in
milliseconds\n");
@@ -260,6 +262,7 @@ int main(int argc, char **argv)
     {"complexity", required_argument, NULL, 0},
     {"framesize", required_argument, NULL, 0},
     {"expect-loss", required_argument, NULL, 0},
+    {"channel-mapping", required_argument, NULL, 0},
     {"downmix-mono",no_argument,NULL, 0},
     {"downmix-stereo",no_argument,NULL, 0},
     {"no-downmix",no_argument,NULL, 0},
@@ -337,6 +340,7 @@ int main(int argc, char **argv)
   opus_int32         coding_rate=48000;
   opus_int32         frame_size=960;
   int                chan=2;
+  int                channel_mapping=-1;
   int                with_hard_cbr=0;
   int                with_cvbr=0;
   int                expect_loss=0;
@@ -465,6 +469,12 @@ int main(int argc, char **argv)
             fprintf(stderr,"Expected loss is a percent and must be
0-100.\n");
             exit(1);
           }
+        }else
if(strcmp(long_options[option_index].name,"channel-mapping")==0){
+          channel_mapping=atoi(optarg);
+          if(channel_mapping < 0 || channel_mapping > 255){
+            fprintf(stderr,"Invalid channel-mapping: %s\n",optarg);
+            exit(1);
+          }
         }else if(strcmp(long_options[option_index].name,"comp")==0 ||
                 
strcmp(long_options[option_index].name,"complexity")==0){
           complexity=atoi(optarg);
@@ -692,7 +702,11 @@ int main(int argc, char **argv)

   /*OggOpus headers*/ /*FIXME: broke forcemono*/
   header.channels=chan;
-  header.channel_mapping=header.channels>8?255:chan>2;
+  if(channel_mapping>=0){
+     header.channel_mapping=channel_mapping;
+  }else{
+     header.channel_mapping=header.channels>8?255:header.channels>2;
+  }
   header.input_sample_rate=rate;
   header.gain=inopt.gain;

--

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