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From: Markus Armbruster <armbru@redhat.com>
To: "Volker Rümelin" <vr_qemu@t-online.de>
Cc: "Zoltán Kővágó" <dirty.ice.hu@gmail.com>,
	"Gerd Hoffmann" <kraxel@redhat.com>, QEMU <qemu-devel@nongnu.org>
Subject: Re: [PATCH 03/23] sdlaudio: add -audiodev sdl, out.buffer-count option
Date: Fri, 15 Jan 2021 09:39:58 +0100
Message-ID: <87pn264mqp.fsf@dusky.pond.sub.org> (raw)
In-Reply-To: <20210110100239.27588-3-vr_qemu@t-online.de> ("Volker =?utf-8?Q?R=C3=BCmelin=22's?= message of "Sun, 10 Jan 2021 11:02:19 +0100")

Volker Rümelin <vr_qemu@t-online.de> writes:

> Currently there is a crackling noise with SDL2 audio playback.
> Commit bcf19777df: "audio/sdlaudio: Allow audio playback with
> SDL2" already mentioned the crackling noise.
>
> Add an out.buffer-count option to give users a chance to select
> sane settings for glitch free audio playback. The idea was taken
> from the coreaudio backend.
>
> The in.buffer-count option will be used with one of the next
> patches.
>
> Signed-off-by: Volker Rümelin <vr_qemu@t-online.de>
> ---
[...]
> diff --git a/qapi/audio.json b/qapi/audio.json
> index 072ed79def..9cba0df8a4 100644
> --- a/qapi/audio.json
> +++ b/qapi/audio.json
> @@ -301,6 +301,37 @@
>      '*out':    'AudiodevPaPerDirectionOptions',
>      '*server': 'str' } }
>  
> +##
> +# @AudiodevSdlPerDirectionOptions:
> +#
> +# Options of the SDL audio backend that are used for both playback and
> +# recording.
> +#
> +# @buffer-count: number of buffers (default 4)
> +#
> +# Since: 6.0
> +##
> +{ 'struct': 'AudiodevSdlPerDirectionOptions',
> +  'base': 'AudiodevPerDirectionOptions',
> +  'data': {
> +    '*buffer-count': 'uint32' } }
> +
> +##
> +# @AudiodevSdlOptions:
> +#
> +# Options of the SDL audio backend.
> +#
> +# @in: options of the recording stream
> +#
> +# @out: options of the playback stream
> +#
> +# Since: 6.0
> +##
> +{ 'struct': 'AudiodevSdlOptions',
> +  'data': {
> +    '*in':  'AudiodevSdlPerDirectionOptions',
> +    '*out': 'AudiodevSdlPerDirectionOptions' } }
> +
>  ##
>  # @AudiodevWavOptions:
>  #
> @@ -385,6 +416,6 @@
>      'jack':      'AudiodevJackOptions',
>      'oss':       'AudiodevOssOptions',
>      'pa':        'AudiodevPaOptions',
> -    'sdl':       'AudiodevGenericOptions',
> +    'sdl':       'AudiodevSdlOptions',
>      'spice':     'AudiodevGenericOptions',
>      'wav':       'AudiodevWavOptions' } }
> diff --git a/qemu-options.hx b/qemu-options.hx
> index 1698a0c751..4e02e9bd76 100644
> --- a/qemu-options.hx
> +++ b/qemu-options.hx
> @@ -588,6 +588,7 @@ DEF("audiodev", HAS_ARG, QEMU_OPTION_audiodev,
>  #endif
>  #ifdef CONFIG_AUDIO_SDL
>      "-audiodev sdl,id=id[,prop[=value][,...]]\n"
> +    "                in|out.buffer-count= number of buffers\n"
>  #endif
>  #ifdef CONFIG_SPICE
>      "-audiodev spice,id=id[,prop[=value][,...]]\n"
> @@ -745,7 +746,12 @@ SRST
>  ``-audiodev sdl,id=id[,prop[=value][,...]]``
>      Creates a backend using SDL. This backend is available on most
>      systems, but you should use your platform's native backend if
> -    possible. This backend has no backend specific properties.
> +    possible.
> +
> +    SDL specific options are:
> +
> +    ``in|out.buffer-count=count``
> +        Sets the count of the buffers.
>  
>  ``-audiodev spice,id=id[,prop[=value][,...]]``
>      Creates a backend that sends audio through SPICE. This backend

These parts:
Acked-by: Markus Armbruster <armbru@redhat.com>



  parent reply index

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-10 10:01 [PATCH 00/23] next round of audio patches Volker Rümelin
2021-01-10 10:02 ` [PATCH 01/23] sdlaudio: remove leftover SDL1.2 code Volker Rümelin
2021-01-14 15:28   ` Thomas Huth
2021-01-10 10:02 ` [PATCH 02/23] audio: fix bit-rotted code Volker Rümelin
2021-01-14 14:32   ` Gerd Hoffmann
2021-01-31 17:13     ` Volker Rümelin
2021-01-10 10:02 ` [PATCH 03/23] sdlaudio: add -audiodev sdl,out.buffer-count option Volker Rümelin
2021-01-14 14:27   ` [PATCH 03/23] sdlaudio: add -audiodev sdl, out.buffer-count option Gerd Hoffmann
2021-01-31 17:30     ` Volker Rümelin
2021-01-15  8:39   ` Markus Armbruster [this message]
2021-01-10 10:02 ` [PATCH 04/23] sdlaudio: don't start playback in init routine Volker Rümelin
2021-01-15  6:28   ` Thomas Huth
2021-01-10 10:02 ` [PATCH 05/23] sdlaudio: always clear the sample buffer Volker Rümelin
2021-01-15  6:31   ` Thomas Huth
2021-01-10 10:02 ` [PATCH 06/23] sdlaudio: fill remaining sample buffer with silence Volker Rümelin
2021-01-14 16:58   ` Thomas Huth
2021-01-17  9:41     ` Volker Rümelin
2021-01-10 10:02 ` [PATCH 07/23] sdlaudio: replace legacy functions with modern ones Volker Rümelin
2021-01-15  7:04   ` Thomas Huth
2021-01-10 10:02 ` [PATCH 08/23] audio: split pcm_ops function get_buffer_in Volker Rümelin
2021-01-10 10:02 ` [PATCH 09/23] sdlaudio: add recording functions Volker Rümelin
2021-01-10 10:02 ` [PATCH 10/23] audio: break generic buffer dependency on mixing-engine Volker Rümelin
2021-01-10 10:02 ` [PATCH 11/23] sdlaudio: enable (in|out).mixing-engine=off Volker Rümelin
2021-01-10 10:02 ` [PATCH 12/23] audio: remove remaining unused plive code Volker Rümelin
2021-01-10 10:02 ` [PATCH 13/23] paaudio: avoid to clip samples multiple times Volker Rümelin
2021-01-10 10:02 ` [PATCH 14/23] paaudio: wait for PA_STREAM_READY in qpa_write() Volker Rümelin
2021-01-10 10:02 ` [PATCH 15/23] paaudio: wait until the playback stream is ready Volker Rümelin
2021-01-10 10:02 ` [PATCH 16/23] paaudio: remove unneeded code Volker Rümelin
2021-01-10 10:02 ` [PATCH 17/23] paaudio: comment bugs in functions qpa_init_* Volker Rümelin
2021-01-10 10:02 ` [PATCH 18/23] paaudio: limit minreq to 75% of audio timer_rate Volker Rümelin
2021-01-10 10:02 ` [PATCH 19/23] paaudio: send recorded data in smaller chunks Volker Rümelin
2021-01-10 10:02 ` [PATCH 20/23] dsoundaudio: replace GetForegroundWindow() Volker Rümelin
2021-01-10 10:02 ` [PATCH 21/23] dsoundaudio: rename dsound_open() Volker Rümelin
2021-01-10 10:02 ` [PATCH 22/23] dsoundaudio: enable f32 audio sample format Volker Rümelin
2021-01-10 10:02 ` [PATCH 23/23] dsoundaudio: fix log message Volker Rümelin
2021-01-10 10:24 ` [PATCH 00/23] next round of audio patches no-reply
2021-01-10 23:09   ` Volker Rümelin
2021-01-14 14:36 ` Gerd Hoffmann

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