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 17 enum vidtv_encoder_id { 18 /* add IDs here when implementing new encoders */ 19 S302M, 20 }; 21 22 struct 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 */ 32 enum 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 * @src_buf: The source of raw data to be encoded, encoder might set a 107 * default if null. 108 * @src_buf_offset: Our position in the source buffer. 109 * @is_video_encoder: Whether this a video encoder (as opposed to audio) 110 * @ctx: Encoder-specific state. 111 * @stream_id: Examples: Audio streams (0xc0-0xdf), Video streams 112 * (0xe0-0xef). 113 * @es_id: The TS PID to use for the elementary stream in this encoder. 114 * @encode: Prepare enough AUs for the given amount of time. 115 * @clear: Clear the encoder output. 116 * @sync: Attempt to synchronize with this encoder. 117 * @sampling_rate_hz: The sampling rate (or fps, if video) used. 118 * @last_sample_cb: Called when the encoder runs out of data.This is 119 * so the source can read data in a 120 * piecemeal fashion instead of having to 121 * provide it all at once. 122 * @destroy: Destroy this encoder, freeing allocated resources. 123 * @next: Next in the chain 124 */ 125 struct vidtv_encoder { 126 enum vidtv_encoder_id id; 127 char *name; 128 129 u8 *encoder_buf; 130 u32 encoder_buf_sz; 131 u32 encoder_buf_offset; 132 133 u64 sample_count; 134 int last_duration; 135 int note_offset; 136 enum musical_notes last_tone; 137 138 struct vidtv_access_unit *access_units; 139 140 void *src_buf; 141 u32 src_buf_sz; 142 u32 src_buf_offset; 143 144 bool is_video_encoder; 145 void *ctx; 146 147 __be16 stream_id; 148 149 __be16 es_pid; 150 151 void *(*encode)(struct vidtv_encoder *e); 152 153 u32 (*clear)(struct vidtv_encoder *e); 154 155 struct vidtv_encoder *sync; 156 157 u32 sampling_rate_hz; 158 159 void (*last_sample_cb)(u32 sample_no); 160 161 void (*destroy)(struct vidtv_encoder *e); 162 163 struct vidtv_encoder *next; 164 }; 165 166 #endif /* VIDTV_ENCODER_H */ 167