1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Vidtv serves as a reference DVB driver and helps validate the existing APIs
4 * in the media subsystem. It can also aid developers working on userspace
5 * applications.
6 *
7 * This file contains a generic encoder type that can provide data for a stream
8 *
9 * Copyright (C) 2020 Daniel W. S. Almeida
10 */
11
12#ifndef VIDTV_ENCODER_H
13#define VIDTV_ENCODER_H
14
15#include <linux/types.h>
16
17enum vidtv_encoder_id {
18 /* add IDs here when implementing new encoders */
19 S302M,
20};
21
22struct vidtv_access_unit {
23 u32 num_samples;
24 u64 pts;
25 u64 dts;
26 u32 nbytes;
27 u32 offset;
28 struct vidtv_access_unit *next;
29};
30
31/* Some musical notes, used by a tone generator. Values are in Hz */
32enum musical_notes {
33 NOTE_SILENT = 0,
34
35 NOTE_C_2 = 65,
36 NOTE_CS_2 = 69,
37 NOTE_D_2 = 73,
38 NOTE_DS_2 = 78,
39 NOTE_E_2 = 82,
40 NOTE_F_2 = 87,
41 NOTE_FS_2 = 93,
42 NOTE_G_2 = 98,
43 NOTE_GS_2 = 104,
44 NOTE_A_2 = 110,
45 NOTE_AS_2 = 117,
46 NOTE_B_2 = 123,
47 NOTE_C_3 = 131,
48 NOTE_CS_3 = 139,
49 NOTE_D_3 = 147,
50 NOTE_DS_3 = 156,
51 NOTE_E_3 = 165,
52 NOTE_F_3 = 175,
53 NOTE_FS_3 = 185,
54 NOTE_G_3 = 196,
55 NOTE_GS_3 = 208,
56 NOTE_A_3 = 220,
57 NOTE_AS_3 = 233,
58 NOTE_B_3 = 247,
59 NOTE_C_4 = 262,
60 NOTE_CS_4 = 277,
61 NOTE_D_4 = 294,
62 NOTE_DS_4 = 311,
63 NOTE_E_4 = 330,
64 NOTE_F_4 = 349,
65 NOTE_FS_4 = 370,
66 NOTE_G_4 = 392,
67 NOTE_GS_4 = 415,
68 NOTE_A_4 = 440,
69 NOTE_AS_4 = 466,
70 NOTE_B_4 = 494,
71 NOTE_C_5 = 523,
72 NOTE_CS_5 = 554,
73 NOTE_D_5 = 587,
74 NOTE_DS_5 = 622,
75 NOTE_E_5 = 659,
76 NOTE_F_5 = 698,
77 NOTE_FS_5 = 740,
78 NOTE_G_5 = 784,
79 NOTE_GS_5 = 831,
80 NOTE_A_5 = 880,
81 NOTE_AS_5 = 932,
82 NOTE_B_5 = 988,
83 NOTE_C_6 = 1047,
84 NOTE_CS_6 = 1109,
85 NOTE_D_6 = 1175,
86 NOTE_DS_6 = 1245,
87 NOTE_E_6 = 1319,
88 NOTE_F_6 = 1397,
89 NOTE_FS_6 = 1480,
90 NOTE_G_6 = 1568,
91 NOTE_GS_6 = 1661,
92 NOTE_A_6 = 1760,
93 NOTE_AS_6 = 1865,
94 NOTE_B_6 = 1976,
95 NOTE_C_7 = 2093
96};
97
98/**
99 * struct vidtv_encoder - A generic encoder type.
100 * @id: So we can cast to a concrete implementation when needed.
101 * @name: Usually the same as the stream name.
102 * @encoder_buf: The encoder internal buffer for the access units.
103 * @encoder_buf_sz: The encoder buffer size, in bytes
104 * @encoder_buf_offset: Our byte position in the encoder buffer.
105 * @sample_count: How many samples we have encoded in total.
106 * @access_units: encoder payload units, used for clock references
107 * @src_buf: The source of raw data to be encoded, encoder might set a
108 * default if null.
109 * @src_buf_sz: size of @src_buf.
110 * @src_buf_offset: Our position in the source buffer.
111 * @is_video_encoder: Whether this a video encoder (as opposed to audio)
112 * @ctx: Encoder-specific state.
113 * @stream_id: Examples: Audio streams (0xc0-0xdf), Video streams
114 * (0xe0-0xef).
115 * @es_pid: The TS PID to use for the elementary stream in this encoder.
116 * @encode: Prepare enough AUs for the given amount of time.
117 * @clear: Clear the encoder output.
118 * @sync: Attempt to synchronize with this encoder.
119 * @sampling_rate_hz: The sampling rate (or fps, if video) used.
120 * @last_sample_cb: Called when the encoder runs out of data.This is
121 * so the source can read data in a
122 * piecemeal fashion instead of having to
123 * provide it all at once.
124 * @destroy: Destroy this encoder, freeing allocated resources.
125 * @next: Next in the chain
126 */
127struct vidtv_encoder {
128 enum vidtv_encoder_id id;
129 char *name;
130
131 u8 *encoder_buf;
132 u32 encoder_buf_sz;
133 u32 encoder_buf_offset;
134
135 u64 sample_count;
136
137 struct vidtv_access_unit *access_units;
138
139 void *src_buf;
140 u32 src_buf_sz;
141 u32 src_buf_offset;
142
143 bool is_video_encoder;
144 void *ctx;
145
146 __be16 stream_id;
147
148 __be16 es_pid;
149
150 void *(*encode)(struct vidtv_encoder *e);
151
152 u32 (*clear)(struct vidtv_encoder *e);
153
154 struct vidtv_encoder *sync;
155
156 u32 sampling_rate_hz;
157
158 void (*last_sample_cb)(u32 sample_no);
159
160 void (*destroy)(struct vidtv_encoder *e);
161
162 struct vidtv_encoder *next;
163};
164
165#endif /* VIDTV_ENCODER_H */
166

source code of linux/drivers/media/test-drivers/vidtv/vidtv_encoder.h