1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2 /*
3  *  compress_offload.h - compress offload header definations
4  *
5  *  Copyright (C) 2011 Intel Corporation
6  *  Authors:	Vinod Koul <vinod.koul@linux.intel.com>
7  *		Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
8  *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9  *
10  *  This program is free software; you can redistribute it and/or modify
11  *  it under the terms of the GNU General Public License as published by
12  *  the Free Software Foundation; version 2 of the License.
13  *
14  *  This program is distributed in the hope that it will be useful, but
15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17  *  General Public License for more details.
18  *
19  *  You should have received a copy of the GNU General Public License along
20  *  with this program; if not, write to the Free Software Foundation, Inc.,
21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
22  *
23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
24  *
25  */
26 #ifndef __COMPRESS_OFFLOAD_H
27 #define __COMPRESS_OFFLOAD_H
28 
29 #include <linux/types.h>
30 #include <sound/asound.h>
31 #include <sound/compress_params.h>
32 
33 
34 #define SNDRV_COMPRESS_VERSION SNDRV_PROTOCOL_VERSION(0, 1, 2)
35 /**
36  * struct snd_compressed_buffer - compressed buffer
37  * @fragment_size: size of buffer fragment in bytes
38  * @fragments: number of such fragments
39  */
40 struct snd_compressed_buffer {
41 	__u32 fragment_size;
42 	__u32 fragments;
43 } __attribute__((packed, aligned(4)));
44 
45 /**
46  * struct snd_compr_params - compressed stream params
47  * @buffer: buffer description
48  * @codec: codec parameters
49  * @no_wake_mode: dont wake on fragment elapsed
50  */
51 struct snd_compr_params {
52 	struct snd_compressed_buffer buffer;
53 	struct snd_codec codec;
54 	__u8 no_wake_mode;
55 } __attribute__((packed, aligned(4)));
56 
57 /**
58  * struct snd_compr_tstamp - timestamp descriptor
59  * @byte_offset: Byte offset in ring buffer to DSP
60  * @copied_total: Total number of bytes copied from/to ring buffer to/by DSP
61  * @pcm_frames: Frames decoded or encoded by DSP. This field will evolve by
62  *	large steps and should only be used to monitor encoding/decoding
63  *	progress. It shall not be used for timing estimates.
64  * @pcm_io_frames: Frames rendered or received by DSP into a mixer or an audio
65  * output/input. This field should be used for A/V sync or time estimates.
66  * @sampling_rate: sampling rate of audio
67  */
68 struct snd_compr_tstamp {
69 	__u32 byte_offset;
70 	__u32 copied_total;
71 	__u32 pcm_frames;
72 	__u32 pcm_io_frames;
73 	__u32 sampling_rate;
74 } __attribute__((packed, aligned(4)));
75 
76 /**
77  * struct snd_compr_avail - avail descriptor
78  * @avail: Number of bytes available in ring buffer for writing/reading
79  * @tstamp: timestamp information
80  */
81 struct snd_compr_avail {
82 	__u64 avail;
83 	struct snd_compr_tstamp tstamp;
84 } __attribute__((packed, aligned(4)));
85 
86 enum snd_compr_direction {
87 	SND_COMPRESS_PLAYBACK = 0,
88 	SND_COMPRESS_CAPTURE
89 };
90 
91 /**
92  * struct snd_compr_caps - caps descriptor
93  * @codecs: pointer to array of codecs
94  * @direction: direction supported. Of type snd_compr_direction
95  * @min_fragment_size: minimum fragment supported by DSP
96  * @max_fragment_size: maximum fragment supported by DSP
97  * @min_fragments: min fragments supported by DSP
98  * @max_fragments: max fragments supported by DSP
99  * @num_codecs: number of codecs supported
100  * @reserved: reserved field
101  */
102 struct snd_compr_caps {
103 	__u32 num_codecs;
104 	__u32 direction;
105 	__u32 min_fragment_size;
106 	__u32 max_fragment_size;
107 	__u32 min_fragments;
108 	__u32 max_fragments;
109 	__u32 codecs[MAX_NUM_CODECS];
110 	__u32 reserved[11];
111 } __attribute__((packed, aligned(4)));
112 
113 /**
114  * struct snd_compr_codec_caps - query capability of codec
115  * @codec: codec for which capability is queried
116  * @num_descriptors: number of codec descriptors
117  * @descriptor: array of codec capability descriptor
118  */
119 struct snd_compr_codec_caps {
120 	__u32 codec;
121 	__u32 num_descriptors;
122 	struct snd_codec_desc descriptor[MAX_NUM_CODEC_DESCRIPTORS];
123 } __attribute__((packed, aligned(4)));
124 
125 /**
126  * enum sndrv_compress_encoder
127  * @SNDRV_COMPRESS_ENCODER_PADDING: no of samples appended by the encoder at the
128  * end of the track
129  * @SNDRV_COMPRESS_ENCODER_DELAY: no of samples inserted by the encoder at the
130  * beginning of the track
131  */
132 enum sndrv_compress_encoder {
133 	SNDRV_COMPRESS_ENCODER_PADDING = 1,
134 	SNDRV_COMPRESS_ENCODER_DELAY = 2,
135 };
136 
137 /**
138  * struct snd_compr_metadata - compressed stream metadata
139  * @key: key id
140  * @value: key value
141  */
142 struct snd_compr_metadata {
143 	 __u32 key;
144 	 __u32 value[8];
145 } __attribute__((packed, aligned(4)));
146 
147 /**
148  * compress path ioctl definitions
149  * SNDRV_COMPRESS_GET_CAPS: Query capability of DSP
150  * SNDRV_COMPRESS_GET_CODEC_CAPS: Query capability of a codec
151  * SNDRV_COMPRESS_SET_PARAMS: Set codec and stream parameters
152  * Note: only codec params can be changed runtime and stream params cant be
153  * SNDRV_COMPRESS_GET_PARAMS: Query codec params
154  * SNDRV_COMPRESS_TSTAMP: get the current timestamp value
155  * SNDRV_COMPRESS_AVAIL: get the current buffer avail value.
156  * This also queries the tstamp properties
157  * SNDRV_COMPRESS_PAUSE: Pause the running stream
158  * SNDRV_COMPRESS_RESUME: resume a paused stream
159  * SNDRV_COMPRESS_START: Start a stream
160  * SNDRV_COMPRESS_STOP: stop a running stream, discarding ring buffer content
161  * and the buffers currently with DSP
162  * SNDRV_COMPRESS_DRAIN: Play till end of buffers and stop after that
163  * SNDRV_COMPRESS_IOCTL_VERSION: Query the API version
164  */
165 #define SNDRV_COMPRESS_IOCTL_VERSION	_IOR('C', 0x00, int)
166 #define SNDRV_COMPRESS_GET_CAPS		_IOWR('C', 0x10, struct snd_compr_caps)
167 #define SNDRV_COMPRESS_GET_CODEC_CAPS	_IOWR('C', 0x11,\
168 						struct snd_compr_codec_caps)
169 #define SNDRV_COMPRESS_SET_PARAMS	_IOW('C', 0x12, struct snd_compr_params)
170 #define SNDRV_COMPRESS_GET_PARAMS	_IOR('C', 0x13, struct snd_codec)
171 #define SNDRV_COMPRESS_SET_METADATA	_IOW('C', 0x14,\
172 						 struct snd_compr_metadata)
173 #define SNDRV_COMPRESS_GET_METADATA	_IOWR('C', 0x15,\
174 						 struct snd_compr_metadata)
175 #define SNDRV_COMPRESS_TSTAMP		_IOR('C', 0x20, struct snd_compr_tstamp)
176 #define SNDRV_COMPRESS_AVAIL		_IOR('C', 0x21, struct snd_compr_avail)
177 #define SNDRV_COMPRESS_PAUSE		_IO('C', 0x30)
178 #define SNDRV_COMPRESS_RESUME		_IO('C', 0x31)
179 #define SNDRV_COMPRESS_START		_IO('C', 0x32)
180 #define SNDRV_COMPRESS_STOP		_IO('C', 0x33)
181 #define SNDRV_COMPRESS_DRAIN		_IO('C', 0x34)
182 #define SNDRV_COMPRESS_NEXT_TRACK	_IO('C', 0x35)
183 #define SNDRV_COMPRESS_PARTIAL_DRAIN	_IO('C', 0x36)
184 /*
185  * TODO
186  * 1. add mmap support
187  *
188  */
189 #define SND_COMPR_TRIGGER_DRAIN 7 /*FIXME move this to pcm.h */
190 #define SND_COMPR_TRIGGER_NEXT_TRACK 8
191 #define SND_COMPR_TRIGGER_PARTIAL_DRAIN 9
192 #endif
193