On Thu, Oct 31, 2024 at 02:14:11PM -0700, anish kumar wrote: > Updated documentation to provide more details > for codec-to-codec connection especially around > the scenarios and DAPM core details for C2C > creation. "Describe in more detail codec-to-codec connection, especially on use cases and DAPM core details for C2C creation." > +An ALSA-based audio system typically involves playback and capture > +functionality, where users may require audio file playback through > +speakers or recording from microphones. However, certain systems > +necessitate audio data routing directly between components, such as FM > +radio to speakers, without CPU involvement. For such scenarios, ASoC( > +ALSA system on chip) provides a mechanism known as codec-to-codec (C2C) "For such scenarios, ASoC (ALSA system on chip) ..." > +connections, leveraging the Dynamic Audio Power Management (DAPM) > +framework to facilitate direct data transfers between codecs. > <snipped>... > +To better understand the configuration inspired by the setup found in > +``sound/soc/samsung/speyside.c``, here are several key points: > + > +1. The presence of ``c2c_params`` informs the DAPM core that the DAI link > + represents a C2C connection. > + > +2. ``c2c_params`` can be an array, and ``num_c2c_params`` defines the size > + of this array. > + > +3. If ``num_c2c_params`` is 1: > + > + - The C2C DAI is configured with the provided ``snd_soc_pcm_stream`` > + parameters. > + > +4. If ``num_c2c_params`` is greater than 1: > + > + - A kcontrol is created, allowing the user to select the index of the > + ``c2c_params`` array to be used. I guess #3 and #4 can be combined, i.e. "If ``num_c2c_params`` is 1, ...; otherwise if ``num_c2c_params`` is greater than 1, ...". Thanks. -- An old man doll... just what I always wanted! - Clara
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