107 lines
2.7 KiB
C
107 lines
2.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* The Virtual DVB test driver serves as a reference DVB driver and helps
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* validate the existing APIs in the media subsystem. It can also aid
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* developers working on userspace applications.
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*
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* Copyright (C) 2020 Daniel W. S. Almeida
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*/
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#ifndef VIDTV_TS_H
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#define VIDTV_TS_H
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#include <linux/types.h>
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#define TS_SYNC_BYTE 0x47
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#define TS_PACKET_LEN 188
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#define TS_PAYLOAD_LEN 184
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#define TS_NULL_PACKET_PID 0x1fff
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#define TS_CC_MAX_VAL 0x0f /* 4 bits */
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#define TS_LAST_VALID_PID 8191
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#define TS_FILL_BYTE 0xff /* the byte used in packet stuffing */
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struct vidtv_mpeg_ts_adaption {
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u8 length;
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struct {
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u8 extension:1;
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u8 private_data:1;
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u8 splicing_point:1;
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u8 OPCR:1;
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u8 PCR:1;
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u8 priority:1;
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u8 random_access:1;
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u8 discontinued:1;
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} __packed;
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u8 data[];
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} __packed;
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struct vidtv_mpeg_ts {
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u8 sync_byte;
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__be16 bitfield; /* tei: 1, payload_start:1 priority: 1, pid:13 */
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struct {
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u8 continuity_counter:4;
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u8 payload:1;
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u8 adaptation_field:1;
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u8 scrambling:2;
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} __packed;
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} __packed;
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/**
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* struct pcr_write_args - Arguments for the pcr_write_into function.
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* @dest_buf: The buffer to write into.
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* @dest_offset: The byte offset into the buffer.
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* @pid: The TS PID for the PCR packets.
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* @buf_sz: The size of the buffer in bytes.
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* @continuity_counter: The TS continuity_counter.
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* @pcr: A sample from the system clock.
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*/
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struct pcr_write_args {
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void *dest_buf;
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u32 dest_offset;
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u16 pid;
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u32 buf_sz;
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u8 *continuity_counter;
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u64 pcr;
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};
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/**
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* struct null_packet_write_args - Arguments for the null_write_into function
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* @dest_buf: The buffer to write into.
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* @dest_offset: The byte offset into the buffer.
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* @buf_sz: The size of the buffer in bytes.
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* @continuity_counter: The TS continuity_counter.
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*/
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struct null_packet_write_args {
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void *dest_buf;
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u32 dest_offset;
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u32 buf_sz;
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u8 *continuity_counter;
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};
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/* Increment the continuity counter */
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void vidtv_ts_inc_cc(u8 *continuity_counter);
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/**
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* vidtv_ts_null_write_into - Write a TS null packet into a buffer.
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* @args: the arguments to use when writing.
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*
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* This function will write a null packet into a buffer. This is usually used to
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* pad TS streams.
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*
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* Return: The number of bytes written into the buffer.
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*/
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u32 vidtv_ts_null_write_into(struct null_packet_write_args args);
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/**
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* vidtv_ts_pcr_write_into - Write a PCR packet into a buffer.
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* @args: the arguments to use when writing.
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*
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* This function will write a PCR packet into a buffer. This is used to
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* synchronize the clocks between encoders and decoders.
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*
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* Return: The number of bytes written into the buffer.
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*/
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u32 vidtv_ts_pcr_write_into(struct pcr_write_args args);
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#endif //VIDTV_TS_H
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