linux-kernel - Re: [alsa-devel] [RFC PATCH 0/3] ALSA: compress: Add support for FLAC

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Message-ID: <19c70dac-aa3e-f0ea-d729-26df4f193eb0@linux.intel.com>
Date:   Fri, 15 Nov 2019 08:55:28 -0600
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Vinod Koul <vkoul@...nel.org>, Takashi Iwai <tiwai@...e.com>
Cc:     alsa-devel@...a-project.org,
        Banajit Goswami <bgoswami@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, Patrick Lai <plai@...eaurora.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [alsa-devel] [RFC PATCH 0/3] ALSA: compress: Add support for FLAC



On 11/15/19 4:27 AM, Vinod Koul wrote:
> The current design of sending codec parameters assumes that decoders
> will have parsers so they can parse the encoded stream for parameters
> and configure the decoder.

that's not quite correct. It's rather than there was no need so far for 
existing implementations to have parameters on decode, this was never a 
limitation of the design, see e.g. the comments below:

/* AAC modes are required for encoders and decoders */

/*
  * IEC modes are mandatory for decoders. Format autodetection
  * will only happen on the DSP side with mode 0. The PCM mode should
  * not be used, the PCM codec should be used instead.
  */