similar to: Ogg Format

Hello Tim I am referring to the following file https://en.wikipedia.org/wiki/File:Sample_of_%22Another_Day_in_Paradise%22.ogg I opened the file in a HEX editor. I do not see the string OpusHead in the packet. It starts with Oggs. Also checking the occurrence of Oggs, I see that the first packet has BOS, the next all (except last) have 00 (which is not defined in the RFC as continuation) and

Amit Ashara wrote: > First Packet shall have Header Type as BOS > All subsequent Packet (except last one_ shall have Header Type as > Continuation > Last Packet shall have Header Type as EOS > > Is this correct? No, the header_type field is a property of a page, not a packet. In it, the continuation flag is used when a single packet spans multiple pages. This is required when

Hello Tim, Jean-Marc Thanks for the clarification. Let me study the sample OPUS file and see if my understanding is now clarified. Regards Amit On Mon, May 9, 2016 at 2:02 PM, Timothy B. Terriberry <tterribe at xiph.org> wrote: > Amit Ashara wrote: > >> I am referring to the following file >> >> >>

>>> Amit Ashara <ashara.amit at gmail.com> schrieb am 12.05.2016 um 17:47 in Nachricht <CAEyg9sgjbsxQY-=VnhQrKiGeTcFSRr1wxOPUhNyCQF8Piuahow at mail.gmail.com>: > Hello Jean-Marc, > > Assuming that a 48KHz, 20ms 8-bit linear PCM data which is 960 bytes is > compressed to 64 bytes (for assumption). The with the Oggs header (4 byte) Actually what I don't

Hi all! Using the code in opus_demo.c I write a c program for encode and decode the audio from one microphone, I can encode and decode raw audio into .opus file, but really is not an opus file because i need to add the "OpusHead" and the "OpusTags". In order that any opus player can play that file. So I only need in my c program how to add this streams to my file an how to

Hi Jean The problem is that for using this package I need to use all the libs like ogg, even Speex?, no, and also where i can find an easy example like opus_demo.c to create the .opus file Greetings Toni 2013/10/28 Jean-Marc Valin <jmvalin at jmvalin.ca> > Hi Toni, > > The package you want is opus-tools. You can get it from the download > section. For file distribution,

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 I thought I would separate this out into a separate mail since it's not comment specific stuff -- There seem to be a couple of inconcistanies in the Ogg spec as regards to lacing values: *) "The raw packet is logicaly divided into [n] 255 byte segments and a last fractional segment of < 255 bytes." However, in the wild, I've

On 05/11/2016 12:35 PM, Amit Ashara wrote: > I ran the opusenc.exe on a wave file and checked the OpusTag section. My > concern is on Total Segment Size being >> than the actual data being > put. Is this just an example of implementation or does a size of 764 > BYTES kept as a place holder for putting more data? Yes, opusenc does reserve some space in the header so that tags can

On 10/05/16 02:37 PM, Amit Ashara wrote: > Is there a format document on the OpusTag structure? Search always shows > up Vorbis but not Opus. The basic format is shared with Vorbis, but the 'magic signature' is different ('OpusTags' instead of '0x05vorbis') and vorbis puts a 0x01 value in an extra byte after the last tag. The OpusTag packet layout is described in

>>> Amit Ashara <ashara.amit at gmail.com> schrieb am 11.05.2016 um 19:32 in Nachricht <CAEyg9sjvTWMBMMCJ8HQcYmbv1BtNt54CgpqWaGNm02MWrKcxaQ at mail.gmail.com>: > Hello Jean-Marc, > > So for the moment we can assume that this method is also OK to use? > > On Embedded Systems, both SRAM and Flash can be a restricting factor > besides the compute time. To

The overhead of Ogg (in file size) is pretty small and it's efficient enough for most applications (and uses far less CPU than the codec anyway). If anything, you might want to look at optimizing the existing Ogg implementation (e.g. like Tremor did in the context of Vorbis). Of course, you're always free to design a new container, but I doubt it's worth it and it's a lot of work

On 05/12/2016 10:35 AM, Amit Ashara wrote: > For HMI panels, except for the capture pattern and a single page segment > entry, other fields are not important, and which results in almost 7% > overhead for a 20ms raw frame encoded with Opus. I'm not sure how you get a 7% overhead. In most uses I've seen, the overhead is more around 1%. > At the same time the > file

Amit Ashara wrote: > 1. Since the stream I am working with is a mono channel, what should be > the advised page_segments to use. I am using an embedded system so > keeping the flash and SRAM usage are vital for the development. The number of channels has no impact on this at all. > 2. In the OpusTag the is the libopus a mandatory field? Yes.

Hi Amit, I'm not sure what you're trying to ask, but the reserved space in the header is an optional thing. Encoders are free to do it, but are not required to do so. Jean-Marc On 05/11/2016 01:32 PM, Amit Ashara wrote: > Hello Jean-Marc, > > So for the moment we can assume that this method is also OK to use? > > On Embedded Systems, both SRAM and Flash can be a

Hello Jean-Marc, As an example, I am using the output of opus encoder to store the file as the following format and read back the same during decode process, without having much overhead. (Thought it would be useful to put a picture rather than running text) [image: Inline image 2] Regards Amit On Thu, May 12, 2016 at 10:47 AM, Amit Ashara <ashara.amit at gmail.com> wrote: > Hello

Hi all, just letting you know that I am about to submit the final version of the Ogg 1.0 file format Internet-Draft to the IETF. It is due by today (March 3, Monday - Internet Draft final submission cut-off at 09:00 ET) for the next IETF meeting and I expect they will promote it to RFC status at the meeting. Please send any last-minute changes to me. Cheers, Silvia. <p><p>

Hi all, just letting you know that I am about to submit the final version of the Ogg 1.0 file format Internet-Draft to the IETF. It is due by today (March 3, Monday - Internet Draft final submission cut-off at 09:00 ET) for the next IETF meeting and I expect they will promote it to RFC status at the meeting. Please send any last-minute changes to me. Cheers, Silvia. <p><p>

Hello all, I'm currently in the process of implementing a mixing matrix into the header of OPUS files for the proposed channel mapping 3 seen here: https://tools.ietf.org/html/draft-ietf-codec-ambisonics-03#section-3.2 My implementation simply replaces writing the stream mapping char array with the Q15 col-wise matrix vals described in the above document. I'm able to write/read matrices

Hello Tim, Jean-Marc Thanks for the inputs and the corrections. I think I understand the Ogg Opus better now and it all makes sense. There are two questions that I am left to ask. 1. Since the stream I am working with is a mono channel, what should be the advised page_segments to use. I am using an embedded system so keeping the flash and SRAM usage are vital for the development. 2. In the

How would one implement the following scheme with minimal use of resources: Every Vorbis packet should be preprocessed to a certain extent, that is, the beginning of every audio packet should be parsed and some decoding steps executed. The result of this predecode as well as the rest of the packet should then be sent as output for final processing. I have skimmed through the standard, and as far