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/Documentation/sound/soc/
Ddai.rst2 ASoC Digital Audio Interface (DAI)
6 SoC controllers and portable audio CODECs today, namely AC97, I2S and PCM.
12 AC97 is a five wire interface commonly found on many PC sound cards. It is
30 usually varies depending on the sample rate and the master system clock
31 (SYSCLK). LRCLK is the same as the sample rate. A few devices support separate
35 I2S has several different operating modes:-
47 PCM chapter
50 PCM is another 4 wire interface, very similar to I2S, which can support a more
53 receive the audio data. Bit clock usually varies depending on sample rate
54 while sync runs at the sample rate. PCM also supports Time Division
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Ddapm.rst11 management frameworks and, as such, can easily co-exist with them.
32 The graph for the STM32MP1-DK1 sound card is shown in picture:
34 .. kernel-figure:: dapm-graph.svg
105 Audio Interface Input (with TDM slot mask).
107 Audio Interface Output (with TDM slot mask).
111 Digital Audio Interface Input.
113 Digital Audio Interface Output.
128 Sample Rate Converter within DSP or CODEC
130 Asynchronous Sample Rate Converter within DSP or CODEC
132 Widget that encodes audio data from one format (usually PCM) to another
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/Documentation/devicetree/bindings/net/bluetooth/
Dbrcm,bluetooth.yaml1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Linus Walleij <linus.walleij@linaro.org>
13 This binding describes Broadcom UART-attached bluetooth chips.
18 - items:
19 - enum:
20 - infineon,cyw43439-bt
21 - const: brcm,bcm4329-bt
22 - enum:
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/Documentation/sound/designs/
Dtracepoints.rst8 Tracepoints in ALSA PCM core
11 ALSA PCM core registers ``snd_pcm`` subsystem to kernel tracepoint system.
12 This subsystem includes two categories of tracepoints; for state of PCM buffer
13 and for processing of PCM hardware parameters. These tracepoints are available
18 Tracepoints for state of PCM buffer
19 ------------------------------------
24 Tracepoints for processing of PCM hardware parameters
25 -----------------------------------------------------
30 In a design of ALSA PCM core, data transmission is abstracted as PCM substream.
31 Applications manage PCM substream to maintain data transmission for PCM frames.
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Dcontrol-names.rst8 ---------------
68 Headset Mic mic part of combined headset jack - 4-pin
70 Headphone Mic mic part of either/or - 3-pin headphone or mic
76 PCM
77 PCM Pan
79 Analog Loopback D/A -> A/D loopback
80 Digital Loopback playback -> capture loopback -
98 -----------------------
106 Tone Control - Switch
107 Tone Control - Bass
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Doss-emulation.rst2 Notes on Kernel OSS-Emulation
12 The OSS emulation for PCM, mixer and sequencer devices is implemented
13 as add-on kernel modules, snd-pcm-oss, snd-mixer-oss and snd-seq-oss.
14 When you need to access the OSS PCM, mixer or sequencer devices, the
18 is called. The alias is defined ``sound-service-x-y``, where x and y are
22 Only necessary step for auto-loading of OSS modules is to define the
25 alias sound-slot-0 snd-emu10k1
27 As the second card, define ``sound-slot-1`` as well.
29 ``alias sound-slot-0 snd-card-0`` doesn't work any more like the old
38 after the corresponding OSS-emulation module is loaded. Don't worry
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Dcompress-offload.rst2 ALSA Compress-Offload API
5 Pierre-Louis.Bossart <pierre-louis.bossart@linux.intel.com>
12 Since its early days, the ALSA API was defined with PCM support or
18 in system-on-chip designs, and DSPs are also integrated in audio
20 reduction of power consumption compared to host-based
26 ALSA PCM interface, a new 'Compressed Data' API is introduced to
27 provide a control and data-streaming interface for audio DSPs.
29 The design of this API was inspired by the 2-year experience with the
39 - separation between byte counts and time. Compressed formats may have
41 may vary from frame-to-frame. As a result, it is not possible to
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/Documentation/sound/cards/
Dcmipci.rst2 Brief Notes on C-Media 8338/8738/8768/8770 Driver
8 Front/Rear Multi-channel Playback
9 ---------------------------------
13 DACs, both streams are handled independently unlike the 4/6ch multi-
16 As default, ALSA driver assigns the first PCM device (i.e. hw:0,0 for
17 card#0) for front and 4/6ch playbacks, while the second PCM device
22 - The first DAC supports U8 and S16LE formats, while the second DAC
24 - The second DAC supports only two channel stereo.
27 rate but only fixed rates: 5512, 8000, 11025, 16000, 22050, 32000,
36 will be FULL VOLUME regardless of Master and PCM volumes [#]_.
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Dbt87x.rst19 does audio. snd-bt87x is a driver for the second function. It's a sound
22 into your sound card's line-in you probably don't need this driver if all
44 <alsa-devel@alsa-project.org>, regardless of whether audio capture works
51 The chip knows two different modes (digital/analog). snd-bt87x
52 registers two PCM devices, one for each mode. They cannot be used at
60 rate depends on the external source which feeds the Bt87x with digital
61 sound via I2S interface.
70 maximum sample rate is 1792000 Hz, but audio data becomes unusable
Daudiophile-usb.rst2 Guide to using M-Audio Audiophile USB with ALSA and Jack
9 This document is a guide to using the M-Audio Audiophile USB (tm) device with
15 * v1.4 - Thibault Le Meur (2007-07-11)
17 - Added Low Endianness nature of 16bits-modes
19 - Modifying document structure
21 * v1.5 - Thibault Le Meur (2007-07-12)
22 - Added AC3/DTS passthru info
35 - This port supports 2 pairs of line-level audio inputs (1/4" TS and RCA)
36 - When the 1/4" TS (jack) connectors are connected, the RCA connectors
48 * sample rate from 8kHz to 96kHz
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/Documentation/devicetree/bindings/net/
Dlantiq,pef2256.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Herve Codina <herve.codina@bootlin.com>
14 line interface component designed to fulfill all required interfacing between
15 an analog E1/T1/J1 line and the digital PCM system highway/H.100 bus.
20 - const: lantiq,pef2256
27 - description: Master Clock
28 - description: System Clock Receive
29 - description: System Clock Transmit
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/Documentation/devicetree/bindings/sound/
Dmaxim,max98504.yaml1 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
13 Maxim Integrated MAX98504 speaker amplifier supports I2C control interface
14 with an IRQ output signal, PCM and PDM digital audio interface (DAI) and a
27 DIOVDD-supply: true
28 DVDD-supply: true
29 PVDD-supply: true
31 maxim,brownout-threshold:
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Dnvidia,tegra186-dspk.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/sound/nvidia,tegra186-dspk.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
11 Density Modulation (PDM) transmitter that up-samples the input to
12 the desired sampling rate by interpolation and then converts the
13 over sampled Pulse Code Modulation (PCM) input to the desired 1-bit
17 - Jon Hunter <jonathanh@nvidia.com>
18 - Sameer Pujar <spujar@nvidia.com>
21 - $ref: dai-common.yaml#
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/Documentation/sound/kernel-api/
Dwriting-an-alsa-driver.rst11 Architecture) <http://www.alsa-project.org/>`__ driver. The document
19 low-level driver implementation details. It only describes the standard
26 -------
56 --------------
60 sub-directories contain different modules and are dependent upon the
66 The code for OSS PCM and mixer emulation modules is stored in this
74 This directory and its sub-directories are for the ALSA sequencer. This
76 as snd-seq-midi, snd-seq-virmidi, etc. They are compiled only when
85 -----------------
88 to be exported to user-space, or included by several files in different
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/Documentation/sound/
Dalsa-configuration.rst2 Advanced Linux Sound Architecture - Driver Configuration guide
14 and PCM supports if you want to run OSS applications with ALSA.
38 ----------
47 limiting card index for auto-loading (1-8);
49 For auto-loading more than one card, specify this option
50 together with snd-card-X aliases.
63 Module snd-pcm-oss
64 ------------------
66 The PCM OSS emulation module.
70 PCM device number maps assigned to the 1st OSS device;
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/Documentation/driver-api/media/drivers/
Dvidtv.rst1 .. SPDX-License-Identifier: GPL-2.0
10 ----------
18 - A fake tuner driver, which will report a bad signal quality if the chosen
22 - A fake demod driver, which will constantly poll the fake signal quality
26 - A fake bridge driver, which is the module responsible for modprobing the
31 - Code responsible for encoding a valid MPEG Transport Stream, which is then
33 For now, we have a single, audio-only channel containing a single MPEG
34 Elementary Stream, which in turn contains a SMPTE 302m encoded sine-wave.
36 way to encode PCM audio data in a MPEG Transport Stream.
39 --------------
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Dcx2341x-devel.rst1 .. SPDX-License-Identifier: GPL-2.0
7 -----------------------
12 .. note:: the memory long words are little-endian ('intel format').
21 .. code-block:: none
23 ivtvctl -O min=0x02000000,max=0x020000ff
26 register space :-).
35 .. code-block:: none
37 0x00000000-0x00ffffff Encoder memory space
38 0x00000000-0x0003ffff Encode.rom
39 ???-??? MPEG buffer(s)
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/Documentation/driver-api/soundwire/
Dstream.rst17 stream must have same sample rate and same sample size.
20 interface. Below are some ways a stream can be represented in SoundWire.
24 -------------------------
26 -------------------------
31 +---------------+ Clock Signal +---------------+
32 | Master +----------------------------------+ Slave |
33 | Interface | | Interface |
36 | L + R +----------------------------------+ L + R |
38 +---------------+ +-----------------------> +---------------+
45 +---------------+ Clock Signal +---------------+
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/Documentation/devicetree/bindings/clock/
Dsamsung,exynos5433-clock.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/clock/samsung,exynos5433-clock.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Chanwoo Choi <cw00.choi@samsung.com>
11 - Krzysztof Kozlowski <krzk@kernel.org>
12 - Sylwester Nawrocki <s.nawrocki@samsung.com>
13 - Tomasz Figa <tomasz.figa@gmail.com>
16 Expected external clocks, defined in DTS as fixed-rate clocks with a matching
18 - "oscclk" - PLL input clock from XXTI
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