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