Re: [Interest] Qt6 porting guidance: QSound? QAudioFormat: endian, codec?
when you say "consider" do you mean "be" ? > On Aug 13, 2021, at 6:26 AM, Doris Verria wrote: > > Hello Dave, > > At the moment, there is no support for changing the format of QAudioBuffer. > This will be a task for after 6.2. > We will consider adding support for decoding into a requested format to > QAudioDecoder in time for 6.2. > > Best, > Doris > > On 12.8.21, 4:32 PM, "David M. Cotter" wrote: > >more specifically, can i create an empty QAudioBuffer in the required > format, and assign to it the QAudioBuffer that came from QAudioDecoder, and > expect it to conform to my specified format? > >thanks > >-dave > >> On Aug 9, 2021, at 12:09 PM, David M. Cotter wrote: >> >>> As mentioned, in Qt6 Beta2 there's no way to set a specific format to >>> decode in (other than that of the encoded file). >> yes, i got that. >> >> my audio pipeline expects a very specific format, and can't handle other >> formats. the source mp3s come from a random assortment from the user, which >> i have no control over. >> >> what i'm asking is if there is a way, in Qt6, AFTER we have PCM data in >> whatever random format, to conform it to another, specific format? >> >> is there a QAudioFormatConverter or something? >> >> if not, honestly, QAudioDecoder is useless. >> >> -dave > > ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest
Re: [Interest] Qt6 porting guidance: QSound? QAudioFormat: endian, codec?
Hello Dave, At the moment, there is no support for changing the format of QAudioBuffer. This will be a task for after 6.2. We will consider adding support for decoding into a requested format to QAudioDecoder in time for 6.2. Best, Doris On 12.8.21, 4:32 PM, "David M. Cotter" wrote: more specifically, can i create an empty QAudioBuffer in the required format, and assign to it the QAudioBuffer that came from QAudioDecoder, and expect it to conform to my specified format? thanks -dave > On Aug 9, 2021, at 12:09 PM, David M. Cotter wrote: > >> As mentioned, in Qt6 Beta2 there's no way to set a specific format to decode in (other than that of the encoded file). > yes, i got that. > > my audio pipeline expects a very specific format, and can't handle other formats. the source mp3s come from a random assortment from the user, which i have no control over. > > what i'm asking is if there is a way, in Qt6, AFTER we have PCM data in whatever random format, to conform it to another, specific format? > > is there a QAudioFormatConverter or something? > > if not, honestly, QAudioDecoder is useless. > > -dave ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest
Re: [Interest] Qt6 porting guidance: QSound? QAudioFormat: endian, codec?
more specifically, can i create an empty QAudioBuffer in the required format, and assign to it the QAudioBuffer that came from QAudioDecoder, and expect it to conform to my specified format? thanks -dave > On Aug 9, 2021, at 12:09 PM, David M. Cotter wrote: > >> As mentioned, in Qt6 Beta2 there's no way to set a specific format to decode >> in (other than that of the encoded file). > yes, i got that. > > my audio pipeline expects a very specific format, and can't handle other > formats. the source mp3s come from a random assortment from the user, which > i have no control over. > > what i'm asking is if there is a way, in Qt6, AFTER we have PCM data in > whatever random format, to conform it to another, specific format? > > is there a QAudioFormatConverter or something? > > if not, honestly, QAudioDecoder is useless. > > -dave ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest
Re: [Interest] Qt6 porting guidance: QSound? QAudioFormat: endian, codec?
> As mentioned, in Qt6 Beta2 there's no way to set a specific format to decode > in (other than that of the encoded file). yes, i got that. my audio pipeline expects a very specific format, and can't handle other formats. the source mp3s come from a random assortment from the user, which i have no control over. what i'm asking is if there is a way, in Qt6, AFTER we have PCM data in whatever random format, to conform it to another, specific format? is there a QAudioFormatConverter or something? if not, honestly, QAudioDecoder is useless. -dave ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest
Re: [Interest] Qt6 porting guidance: QSound? QAudioFormat: endian, codec?
Hi, Sorry if I was unclear. I mean that the decoded audio will have the same sample rate, sample format, and channel count as that of the original media. Not codec. QAudioDecoder will always output uncompressed PCM data. If you have an mp3 file of format 32k, 16bit signed int, stereo, QAudioDecoder will output PCM data of 32k, 16bit signed int, stereo from it. If the sample size (bit depth) is not known, often the case for some compressed formats like mp3 and aac, the sample format of the decoded audio will default to 16bit signed int. As mentioned, in Qt6 Beta2 there's no way to set a specific format to decode in (other than that of the encoded file). Best, Doris On 9.8.21, 4:58 PM, "David M. Cotter" wrote: > QAudioDecoder now decodes to the native format used in the encoded file do you mean if the native format is mp3, that i'm going to get mp3 data? if so, how is that considered "decoding" ? > That is, it will output in the same channel count, sample rate, sample format (the bits per sample information is sometimes irrelevant for compressed formats and therefore will be 0 or not known. i don't get it. i thought the point was to get PCM / raw uncompressed data? does Qt6 Beta2 have some facility for "conforming" the output of QAudioDecoder to, say, 44.1k, 16bit signed int, Stereo? -dave ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest
Re: [Interest] Qt6 porting guidance: QSound? QAudioFormat: endian, codec?
> QAudioDecoder now decodes to the native format used in the encoded file do you mean if the native format is mp3, that i'm going to get mp3 data? if so, how is that considered "decoding" ? > That is, it will output in the same channel count, sample rate, sample format > (the bits per sample information is sometimes irrelevant for compressed > formats and therefore will be 0 or not known. i don't get it. i thought the point was to get PCM / raw uncompressed data? does Qt6 Beta2 have some facility for "conforming" the output of QAudioDecoder to, say, 44.1k, 16bit signed int, Stereo? -dave ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest
Re: [Interest] Qt6 porting guidance: QSound? QAudioFormat: endian, codec?
Hello João, Please go ahead and create a bug report about it. Thanks. Best, Doris From: joao morgado Date: Monday, 9 August 2021, 2:44 PM To: Qt Interest , Doris Verria Subject: Re: [Interest] Qt6 porting guidance: QSound? QAudioFormat: endian, codec? Hi Doris I've been testing SoundEffects in Qt6.2 beta2 and it's still quite buggy, a simple example code like the one in the docs SoundEffect QML Type | Qt Multimedia 6.2.0<https://doc-snapshots.qt.io/qt6-dev/qml-qtmultimedia-soundeffect.html> - in windows crashes the program (if I remove the line where the wav file is set in source, the program does not crash, but of course nothing is played) - in linux mint I only get sound one time, at the first press event - in MacOS works good Shall I make a bug report, or do you Qt guys already know this ? Thanks João Em segunda-feira, 9 de agosto de 2021 11:38:51 GMT+1, Doris Verria escreveu: Hello, Currently, it is not possible to request a specific format for QAudioDecoder. We plan to support this after 6.2. QAudioDecoder now decodes to the native format used in the encoded file. That is, it will output in the same channel count, sample rate, sample format (the bits per sample information is sometimes irrelevant for compressed formats and therefore will be 0 or not known. In that case, the output format will default to 16bit signed int) as the original file. QAudioBuffer, returned by QAudioDecoder::read(), will have the correct output format set and can be retrieved through QAudioBuffer::format(). Best, Doris On 8.8.21, 3:46 AM, "David M. Cotter" mailto:d...@kjams.com>> wrote: You can still specify the channel count, sample rate, and the sample format where and how does one do this for QAudioDecoder? or does QAudioDecoder only always output one specific format? what is the format? 44100 hz, 16bit signed int, stereo? or what? i see no documentation that explains this, nor is there anything in the header indicating it is possible to request a specific format -dave ___ Interest mailing list Interest@qt-project.org<mailto:Interest@qt-project.org> https://lists.qt-project.org/listinfo/interest ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest
Re: [Interest] Qt6 porting guidance: QSound? QAudioFormat: endian, codec?
Hi Doris I've been testing SoundEffects in Qt6.2 beta2 and it's still quite buggy, a simple example code like the one in the docsSoundEffect QML Type | Qt Multimedia 6.2.0 - in windows crashes the program (if I remove the line where the wav file is set in source, the program does not crash, but of course nothing is played)- in linux mint I only get sound one time, at the first press event- in MacOS works good Shall I make a bug report, or do you Qt guys already know this ? ThanksJoão Em segunda-feira, 9 de agosto de 2021 11:38:51 GMT+1, Doris Verria escreveu: Hello, Currently, it is not possible to request a specific format for QAudioDecoder. We plan to support this after 6.2. QAudioDecoder now decodes to the native format used in the encoded file. That is, it will output in the same channel count, sample rate, sample format (the bits per sample information is sometimes irrelevant for compressed formats and therefore will be 0 or not known. In that case, the output format will default to 16bit signed int) as the original file. QAudioBuffer, returned by QAudioDecoder::read(), will have the correct output format set and can be retrieved through QAudioBuffer::format(). Best, Doris On 8.8.21, 3:46 AM, "David M. Cotter" wrote: You can still specify the channel count, sample rate, and the sample format where and how does one do this for QAudioDecoder? or does QAudioDecoder only always output one specific format? what is the format? 44100 hz, 16bit signed int, stereo? or what? i see no documentation that explains this, nor is there anything in the header indicating it is possible to request a specific format -dave ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest
Re: [Interest] Qt6 porting guidance: QSound? QAudioFormat: endian, codec?
Hello, Currently, it is not possible to request a specific format for QAudioDecoder. We plan to support this after 6.2. QAudioDecoder now decodes to the native format used in the encoded file. That is, it will output in the same channel count, sample rate, sample format (the bits per sample information is sometimes irrelevant for compressed formats and therefore will be 0 or not known. In that case, the output format will default to 16bit signed int) as the original file. QAudioBuffer, returned by QAudioDecoder::read(), will have the correct output format set and can be retrieved through QAudioBuffer::format(). Best, Doris On 8.8.21, 3:46 AM, "David M. Cotter" wrote: You can still specify the channel count, sample rate, and the sample format where and how does one do this for QAudioDecoder? or does QAudioDecoder only always output one specific format? what is the format? 44100 hz, 16bit signed int, stereo? or what? i see no documentation that explains this, nor is there anything in the header indicating it is possible to request a specific format -dave ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest
Re: [Interest] Qt6 porting guidance: QSound? QAudioFormat: endian, codec?
You can still specify the channel count, sample rate, and the sample format where and how does one do this for QAudioDecoder? or does QAudioDecoder only always output one specific format? what is the format? 44100 hz, 16bit signed int, stereo? or what? i see no documentation that explains this, nor is there anything in the header indicating it is possible to request a specific format -dave ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest
Re: [Interest] Qt6 porting guidance: QSound? QAudioFormat: endian, codec?
i take it also that "unsignedInt" is also no longer supported? that it's always signed? > On Jul 7, 2021, at 1:17 PM, Doris Verria wrote: > > Hi, > > You can play sounds using QSoundEffect, which replaces QSound. If low-latency > is not important, you can always use QMediaPlayer. > QSoundEffect currently supports PCM audio only, more specifically, the WAV > format. > > QAudioFormat now always expects samples in the host endianness, so you will > need to convert the samples if they are in a > different byte order than that of the host platform. > > QAudioFormat supports PCM audio formats only, so there's no need to > set the codec. You can still specify the channel count, sample rate, and the > sample format (it supports 8bit unsigned, 16 and 32bit > signed Int, as well as floating point formats). > > For an overview of Multimedia in Qt6, have a look at this blog post from Lars: > https://www.qt.io/blog/qt-multimedia-in-qt-6 > > > Best regards, > Doris > > > > On 7.7.21, 9:26 PM, "Interest on behalf of David M. Cotter" > wrote: > >requires mac/windows solution (no need for ios/android/linux) > >how do i "just play a sound" ? >seems QSound is gone? > >how does one specify endian format of a PCM stream? >format.setByteOrder() is gone? > >how does one specify that the stream is in fact PCM? >format.setCodec() is gone? ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest
Re: [Interest] Qt6 porting guidance: QSound? QAudioFormat: endian, codec?
Hi, You can play sounds using QSoundEffect, which replaces QSound. If low-latency is not important, you can always use QMediaPlayer. QSoundEffect currently supports PCM audio only, more specifically, the WAV format. QAudioFormat now always expects samples in the host endianness, so you will need to convert the samples if they are in a different byte order than that of the host platform. QAudioFormat supports PCM audio formats only, so there's no need to set the codec. You can still specify the channel count, sample rate, and the sample format (it supports 8bit unsigned, 16 and 32bit signed Int, as well as floating point formats). For an overview of Multimedia in Qt6, have a look at this blog post from Lars: https://www.qt.io/blog/qt-multimedia-in-qt-6 Best regards, Doris On 7.7.21, 9:26 PM, "Interest on behalf of David M. Cotter" wrote: requires mac/windows solution (no need for ios/android/linux) how do i "just play a sound" ? seems QSound is gone? how does one specify endian format of a PCM stream? format.setByteOrder() is gone? how does one specify that the stream is in fact PCM? format.setCodec() is gone? ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest
