linux-kernel - [RFC PATCH v3 1/6] ALSA: compress: Add output rate and output format support

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Message-Id: <1725615837-24872-2-git-send-email-shengjiu.wang@nxp.com>
Date: Fri,  6 Sep 2024 17:43:52 +0800
From: Shengjiu Wang <shengjiu.wang@....com>
To: vkoul@...nel.org,
	perex@...ex.cz,
	tiwai@...e.com,
	alsa-devel@...a-project.org,
	linux-sound@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	shengjiu.wang@...il.com,
	Xiubo.Lee@...il.com,
	festevam@...il.com,
	nicoleotsuka@...il.com,
	lgirdwood@...il.com,
	broonie@...nel.org,
	linuxppc-dev@...ts.ozlabs.org
Subject: [RFC PATCH v3 1/6] ALSA: compress: Add output rate and output format support

Add 'pcm_format' for struct snd_codec, add 'pcm_formats' for
struct snd_codec_desc, these are used for accelerator usage.

Current accelerator example is sample rate converter (SRC).
Define struct snd_codec_desc_src for descript minmum and maxmum
sample rates. And add 'src_d' in union snd_codec_options
structure. These are mainly used for capbility query.

Signed-off-by: Jaroslav Kysela <perex@...ex.cz>
Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>
---
 include/uapi/sound/compress_params.h | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/include/uapi/sound/compress_params.h b/include/uapi/sound/compress_params.h
index ddc77322d571..bc7648a30746 100644
--- a/include/uapi/sound/compress_params.h
+++ b/include/uapi/sound/compress_params.h
@@ -334,6 +334,14 @@ union snd_codec_options {
 	struct snd_dec_wma wma_d;
 	struct snd_dec_alac alac_d;
 	struct snd_dec_ape ape_d;
+	struct {
+		__u32 out_sample_rate;
+	} src_d;
+} __attribute__((packed, aligned(4)));
+
+struct snd_codec_desc_src {
+	__u32 out_sample_rate_min;
+	__u32 out_sample_rate_max;
 } __attribute__((packed, aligned(4)));
 
 /** struct snd_codec_desc - description of codec capabilities
@@ -347,6 +355,9 @@ union snd_codec_options {
  * @modes: Supported modes. See SND_AUDIOMODE defines
  * @formats: Supported formats. See SND_AUDIOSTREAMFORMAT defines
  * @min_buffer: Minimum buffer size handled by codec implementation
+ * @pcm_formats: Output (for decoders) or input (for encoders)
+ *               PCM formats (required to accel mode, 0 for other modes)
+ * @u_space: union space (for codec dependent data)
  * @reserved: reserved for future use
  *
  * This structure provides a scalar value for profiles, modes and stream
@@ -370,7 +381,12 @@ struct snd_codec_desc {
 	__u32 modes;
 	__u32 formats;
 	__u32 min_buffer;
-	__u32 reserved[15];
+	__u32 pcm_formats;
+	union {
+		__u32 u_space[6];
+		struct snd_codec_desc_src src;
+	} __attribute__((packed, aligned(4)));
+	__u32 reserved[8];
 } __attribute__((packed, aligned(4)));
 
 /** struct snd_codec
@@ -395,6 +411,8 @@ struct snd_codec_desc {
  * @align: Block alignment in bytes of an audio sample.
  *		Only required for PCM or IEC formats.
  * @options: encoder-specific settings
+ * @pcm_format: Output (for decoders) or input (for encoders)
+ *               PCM formats (required to accel mode, 0 for other modes)
  * @reserved: reserved for future use
  */
 
@@ -411,7 +429,8 @@ struct snd_codec {
 	__u32 format;
 	__u32 align;
 	union snd_codec_options options;
-	__u32 reserved[3];
+	__u32 pcm_format;
+	__u32 reserved[2];
 } __attribute__((packed, aligned(4)));
 
 #endif
-- 
2.34.1