cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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vidtv_ts.h (2739B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/*
      3 * The Virtual DVB test driver serves as a reference DVB driver and helps
      4 * validate the existing APIs in the media subsystem. It can also aid
      5 * developers working on userspace applications.
      6 *
      7 * Copyright (C) 2020 Daniel W. S. Almeida
      8 */
      9
     10#ifndef VIDTV_TS_H
     11#define VIDTV_TS_H
     12
     13#include <linux/types.h>
     14
     15#define TS_SYNC_BYTE 0x47
     16#define TS_PACKET_LEN 188
     17#define TS_PAYLOAD_LEN 184
     18#define TS_NULL_PACKET_PID 0x1fff
     19#define TS_CC_MAX_VAL 0x0f /* 4 bits */
     20#define TS_LAST_VALID_PID 8191
     21#define TS_FILL_BYTE 0xff /* the byte used in packet stuffing */
     22
     23struct vidtv_mpeg_ts_adaption {
     24	u8 length;
     25	struct {
     26		u8 extension:1;
     27		u8 private_data:1;
     28		u8 splicing_point:1;
     29		u8 OPCR:1;
     30		u8 PCR:1;
     31		u8 priority:1;
     32		u8 random_access:1;
     33		u8 discontinued:1;
     34	} __packed;
     35	u8 data[];
     36} __packed;
     37
     38struct vidtv_mpeg_ts {
     39	u8 sync_byte;
     40	__be16 bitfield; /* tei: 1, payload_start:1 priority: 1, pid:13 */
     41	struct {
     42		u8 continuity_counter:4;
     43		u8 payload:1;
     44		u8 adaptation_field:1;
     45		u8 scrambling:2;
     46	} __packed;
     47} __packed;
     48
     49/**
     50 * struct pcr_write_args - Arguments for the pcr_write_into function.
     51 * @dest_buf: The buffer to write into.
     52 * @dest_offset: The byte offset into the buffer.
     53 * @pid: The TS PID for the PCR packets.
     54 * @buf_sz: The size of the buffer in bytes.
     55 * @continuity_counter: The TS continuity_counter.
     56 * @pcr: A sample from the system clock.
     57 */
     58struct pcr_write_args {
     59	void *dest_buf;
     60	u32 dest_offset;
     61	u16 pid;
     62	u32 buf_sz;
     63	u8 *continuity_counter;
     64	u64 pcr;
     65};
     66
     67/**
     68 * struct null_packet_write_args - Arguments for the null_write_into function
     69 * @dest_buf: The buffer to write into.
     70 * @dest_offset: The byte offset into the buffer.
     71 * @buf_sz: The size of the buffer in bytes.
     72 * @continuity_counter: The TS continuity_counter.
     73 */
     74struct null_packet_write_args {
     75	void *dest_buf;
     76	u32 dest_offset;
     77	u32 buf_sz;
     78	u8 *continuity_counter;
     79};
     80
     81/* Increment the continuity counter */
     82void vidtv_ts_inc_cc(u8 *continuity_counter);
     83
     84/**
     85 * vidtv_ts_null_write_into - Write a TS null packet into a buffer.
     86 * @args: the arguments to use when writing.
     87 *
     88 * This function will write a null packet into a buffer. This is usually used to
     89 * pad TS streams.
     90 *
     91 * Return: The number of bytes written into the buffer.
     92 */
     93u32 vidtv_ts_null_write_into(struct null_packet_write_args args);
     94
     95/**
     96 * vidtv_ts_pcr_write_into - Write a PCR  packet into a buffer.
     97 * @args: the arguments to use when writing.
     98 *
     99 * This function will write a PCR packet into a buffer. This is used to
    100 * synchronize the clocks between encoders and decoders.
    101 *
    102 * Return: The number of bytes written into the buffer.
    103 */
    104u32 vidtv_ts_pcr_write_into(struct pcr_write_args args);
    105
    106#endif //VIDTV_TS_H