[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [PULL 15/26] audio: add mixeng option (documentation)
From: |
Eric Blake |
Subject: |
Re: [PULL 15/26] audio: add mixeng option (documentation) |
Date: |
Thu, 19 Sep 2019 10:27:17 -0500 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 |
On 9/19/19 3:36 AM, Gerd Hoffmann wrote:
> From: Kővágó, Zoltán <address@hidden>
>
> This will allow us to disable mixeng when we use a decent backend.
>
> Disabling mixeng have a few advantages:
> * we no longer convert the audio output from one format to another, when
> the underlying audio system would just convert it to a third format.
> We no longer convert, only the underlying system, when needed.
> * the underlying system probably has better resampling and sample format
> converting methods anyway...
> * we may support formats that the mixeng currently does not support (S24
> or float samples, more than two channels)
> * when using an audio server (like pulseaudio) different sound card
> outputs will show up as separate streams, even if we use only one
> backend
>
> Disadvantages:
> * audio capturing no longer works (wavcapture, and vnc audio extension)
> * some backends only support a single playback stream or very picky
> about the audio format. In this case we can't disable mixeng.
>
> However mixeng is not removed, only made optional, so this shouldn't be
> a big concern.
>
> +++ b/qemu-options.hx
> @@ -433,6 +433,7 @@ DEF("audiodev", HAS_ARG, QEMU_OPTION_audiodev,
> " specifies the audio backend to use\n"
> " id= identifier of the backend\n"
> " timer-period= timer period in microseconds\n"
> + " in|out.mixing-engineeng= use mixing engine to mix
> streams inside QEMU\n"
s/engineeng/engine/
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3226
Virtualization: qemu.org | libvirt.org
signature.asc
Description: OpenPGP digital signature
- [Qemu-devel] [PULL 00/26] Audio 20190919 patches, Gerd Hoffmann, 2019/09/19
- [Qemu-devel] [PULL 05/26] noaudio: port to the new audio backend api, Gerd Hoffmann, 2019/09/19
- [Qemu-devel] [PULL 08/26] sdlaudio: port to the new audio backend api, Gerd Hoffmann, 2019/09/19
- [Qemu-devel] [PULL 03/26] coreaudio: port to the new audio backend api, Gerd Hoffmann, 2019/09/19
- [Qemu-devel] [PULL 20/26] audio: basic support for multichannel audio, Gerd Hoffmann, 2019/09/19
- [Qemu-devel] [PULL 01/26] audio: api for mixeng code free backends, Gerd Hoffmann, 2019/09/19
- [Qemu-devel] [PULL 15/26] audio: add mixeng option (documentation), Gerd Hoffmann, 2019/09/19
- Re: [PULL 15/26] audio: add mixeng option (documentation),
Eric Blake <=
- [Qemu-devel] [PULL 17/26] paaudio: get/put_buffer functions, Gerd Hoffmann, 2019/09/19
- [Qemu-devel] [PULL 22/26] usb-audio: do not count on avail bytes actually available, Gerd Hoffmann, 2019/09/19
- [Qemu-devel] [PULL 11/26] audio: remove remains of the old backend api, Gerd Hoffmann, 2019/09/19
- [Qemu-devel] [PULL 18/26] audio: support more than two channels in volume setting, Gerd Hoffmann, 2019/09/19
- [Qemu-devel] [PULL 12/26] audio: unify input and output mixeng buffer management, Gerd Hoffmann, 2019/09/19
- [Qemu-devel] [PULL 02/26] alsaaudio: port to the new audio backend api, Gerd Hoffmann, 2019/09/19
- [Qemu-devel] [PULL 09/26] spiceaudio: port to the new audio backend api, Gerd Hoffmann, 2019/09/19
- [Qemu-devel] [PULL 16/26] audio: make mixeng optional, Gerd Hoffmann, 2019/09/19
- [Qemu-devel] [PULL 10/26] wavaudio: port to the new audio backend api, Gerd Hoffmann, 2019/09/19
- [Qemu-devel] [PULL 04/26] dsoundaudio: port to the new audio backend api, Gerd Hoffmann, 2019/09/19