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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Vidtv serves as a reference DVB driver and helps validate the existing APIs
* in the media subsystem. It can also aid developers working on userspace
* applications.
*
* This file contains a generic encoder type that can provide data for a stream
*
* Copyright (C) 2020 Daniel W. S. Almeida
*/
#ifndef VIDTV_ENCODER_H
#define VIDTV_ENCODER_H
#include <linux/types.h>
enum vidtv_encoder_id {
/* add IDs here when implementing new encoders */
S302M,
};
struct vidtv_access_unit {
u32 num_samples;
u64 pts;
u64 dts;
u32 nbytes;
u32 offset;
struct vidtv_access_unit *next;
};
/* Some musical notes, used by a tone generator */
enum musical_notes {
NOTE_SILENT = 0,
NOTE_C_2 = 65,
NOTE_CS_2 = 69,
NOTE_D_2 = 73,
NOTE_DS_2 = 78,
NOTE_E_2 = 82,
NOTE_F_2 = 87,
NOTE_FS_2 = 93,
NOTE_G_2 = 98,
NOTE_GS_2 = 104,
NOTE_A_2 = 110,
NOTE_AS_2 = 117,
NOTE_B_2 = 123,
NOTE_C_3 = 131,
NOTE_CS_3 = 139,
NOTE_D_3 = 147,
NOTE_DS_3 = 156,
NOTE_E_3 = 165,
NOTE_F_3 = 175,
NOTE_FS_3 = 185,
NOTE_G_3 = 196,
NOTE_GS_3 = 208,
NOTE_A_3 = 220,
NOTE_AS_3 = 233,
NOTE_B_3 = 247,
NOTE_C_4 = 262,
NOTE_CS_4 = 277,
NOTE_D_4 = 294,
NOTE_DS_4 = 311,
NOTE_E_4 = 330,
NOTE_F_4 = 349,
NOTE_FS_4 = 370,
NOTE_G_4 = 392,
NOTE_GS_4 = 415,
NOTE_A_4 = 440,
NOTE_AS_4 = 466,
NOTE_B_4 = 494,
NOTE_C_5 = 523,
NOTE_CS_5 = 554,
NOTE_D_5 = 587,
NOTE_DS_5 = 622,
NOTE_E_5 = 659,
NOTE_F_5 = 698,
NOTE_FS_5 = 740,
NOTE_G_5 = 784,
NOTE_GS_5 = 831,
NOTE_A_5 = 880,
NOTE_AS_5 = 932,
NOTE_B_5 = 988,
NOTE_C_6 = 1047,
NOTE_CS_6 = 1109,
NOTE_D_6 = 1175,
NOTE_DS_6 = 1245,
NOTE_E_6 = 1319,
NOTE_F_6 = 1397,
NOTE_FS_6 = 1480,
NOTE_G_6 = 1568,
NOTE_GS_6 = 1661,
NOTE_A_6 = 1760,
NOTE_AS_6 = 1865,
NOTE_B_6 = 1976,
NOTE_C_7 = 2093
};
/**
* struct vidtv_encoder - A generic encoder type.
* @id: So we can cast to a concrete implementation when needed.
* @name: Usually the same as the stream name.
* @encoder_buf: The encoder internal buffer for the access units.
* @encoder_buf_sz: The encoder buffer size, in bytes
* @encoder_buf_offset: Our byte position in the encoder buffer.
* @sample_count: How many samples we have encoded in total.
* @src_buf: The source of raw data to be encoded, encoder might set a
* default if null.
* @src_buf_offset: Our position in the source buffer.
* @is_video_encoder: Whether this a video encoder (as opposed to audio)
* @ctx: Encoder-specific state.
* @stream_id: Examples: Audio streams (0xc0-0xdf), Video streams
* (0xe0-0xef).
* @es_id: The TS PID to use for the elementary stream in this encoder.
* @encode: Prepare enough AUs for the given amount of time.
* @clear: Clear the encoder output.
* @sync: Attempt to synchronize with this encoder.
* @sampling_rate_hz: The sampling rate (or fps, if video) used.
* @last_sample_cb: Called when the encoder runs out of data.This is
* so the source can read data in a
* piecemeal fashion instead of having to
* provide it all at once.
* @destroy: Destroy this encoder, freeing allocated resources.
* @next: Next in the chain
*/
struct vidtv_encoder {
enum vidtv_encoder_id id;
char *name;
u8 *encoder_buf;
u32 encoder_buf_sz;
u32 encoder_buf_offset;
u64 sample_count;
int last_duration;
int note_offset;
enum musical_notes last_tone;
struct vidtv_access_unit *access_units;
void *src_buf;
u32 src_buf_sz;
u32 src_buf_offset;
bool is_video_encoder;
void *ctx;
__be16 stream_id;
__be16 es_pid;
void *(*encode)(struct vidtv_encoder *e);
u32 (*clear)(struct vidtv_encoder *e);
struct vidtv_encoder *sync;
u32 sampling_rate_hz;
void (*last_sample_cb)(u32 sample_no);
void (*destroy)(struct vidtv_encoder *e);
struct vidtv_encoder *next;
};
#endif /* VIDTV_ENCODER_H */
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