ra8_jpeg_stream_state_t Struct Reference

Whole streaming-decode state: source window + geometry + stripe. More...

Collaboration diagram for ra8_jpeg_stream_state_t:

Data Fields
ra8_jpeg_sw_pull_fn	pull
	Sequential byte source.
void *	pull_ctx
	Context for pull.
uint8_t *	win
	Sliding window base.
uint32_t	win_cap
	Window capacity, bytes.
uint32_t	win_len
	Valid bytes currently in the window.
uint8_t	eof
	1 once the source reported EOF.
ra8_jpeg_sw_rows_fn	on_rows
	Stripe sink.
void *	cb_ctx
	Consumer context for both callbacks.
uint8_t *	stripe
	Consumer stripe buffer (geometry cb).
uint32_t	stripe_cap
	Stripe buffer capacity, bytes.
uint8_t	channels
	Output channels (1 or 3).
uint16_t	mcu_w
	MCU width, pixels.
uint16_t	mcu_h
	MCU height, pixels (== stripe rows).
uint16_t	mcus_x
	MCU columns.
uint16_t	mcus_y
	MCU rows.
ra8_jpeg_dec_ctx_t	dec
	Shared decoder tables + parse state.

Detailed Description

Whole streaming-decode state: source window + geometry + stripe.

One module-static instance (mirrors the whole-buffer driver's static context): the decoder tables alone are tens of KiB, which would blow the stack budget.

Invariant

win_len <= win_cap and stripe_cap >= width * mcu_h * ch once the geometry callback has accepted the image.

Definition at line 65 of file ra8_jpeg_sw_stream.c.

Field Documentation

cb_ctx

void* ra8_jpeg_stream_state_t::cb_ctx

Consumer context for both callbacks.

Definition at line 74 of file ra8_jpeg_sw_stream.c.

Referenced by internal_js_begin(), internal_js_bind_geometry(), and internal_js_scan().

channels

uint8_t ra8_jpeg_stream_state_t::channels

Output channels (1 or 3).

Definition at line 78 of file ra8_jpeg_sw_stream.c.

Referenced by internal_js_bind_geometry(), internal_js_emit_mcu(), and internal_js_scan().

dec

ra8_jpeg_dec_ctx_t ra8_jpeg_stream_state_t::dec

Shared decoder tables + parse state.

Definition at line 84 of file ra8_jpeg_sw_stream.c.

Referenced by internal_js_bind_geometry(), internal_js_decode_mcu(), internal_js_emit_mcu(), internal_js_parse_markers(), and internal_js_scan().

eof

uint8_t ra8_jpeg_stream_state_t::eof

1 once the source reported EOF.

Definition at line 71 of file ra8_jpeg_sw_stream.c.

Referenced by internal_js_refill(), and internal_js_scan_margin().

mcu_h

uint16_t ra8_jpeg_stream_state_t::mcu_h

MCU height, pixels (== stripe rows).

Definition at line 80 of file ra8_jpeg_sw_stream.c.

Referenced by internal_js_bind_geometry(), and internal_js_scan().

mcu_w

uint16_t ra8_jpeg_stream_state_t::mcu_w

MCU width, pixels.

Definition at line 79 of file ra8_jpeg_sw_stream.c.

Referenced by internal_js_bind_geometry(), internal_js_decode_mcu(), and internal_js_emit_mcu().

mcus_x

uint16_t ra8_jpeg_stream_state_t::mcus_x

MCU columns.

Definition at line 81 of file ra8_jpeg_sw_stream.c.

Referenced by internal_js_bind_geometry(), and internal_js_scan().

mcus_y

uint16_t ra8_jpeg_stream_state_t::mcus_y

MCU rows.

Definition at line 82 of file ra8_jpeg_sw_stream.c.

Referenced by internal_js_bind_geometry(), and internal_js_scan().

on_rows

ra8_jpeg_sw_rows_fn ra8_jpeg_stream_state_t::on_rows

Stripe sink.

Definition at line 73 of file ra8_jpeg_sw_stream.c.

Referenced by internal_js_begin(), and internal_js_scan().

pull

ra8_jpeg_sw_pull_fn ra8_jpeg_stream_state_t::pull

Sequential byte source.

Definition at line 66 of file ra8_jpeg_sw_stream.c.

Referenced by internal_js_begin(), and internal_js_refill().

pull_ctx

void* ra8_jpeg_stream_state_t::pull_ctx

Context for pull.

Definition at line 67 of file ra8_jpeg_sw_stream.c.

Referenced by internal_js_begin(), and internal_js_refill().

stripe

uint8_t* ra8_jpeg_stream_state_t::stripe

Consumer stripe buffer (geometry cb).

Definition at line 76 of file ra8_jpeg_sw_stream.c.

Referenced by internal_js_bind_geometry(), internal_js_emit_mcu(), and internal_js_scan().

stripe_cap

uint32_t ra8_jpeg_stream_state_t::stripe_cap

Stripe buffer capacity, bytes.

Definition at line 77 of file ra8_jpeg_sw_stream.c.

Referenced by internal_js_bind_geometry().

win

uint8_t* ra8_jpeg_stream_state_t::win

Sliding window base.

Definition at line 68 of file ra8_jpeg_sw_stream.c.

Referenced by internal_js_begin(), internal_js_parse_markers(), internal_js_refill(), internal_js_scan(), and internal_js_slide().

win_cap

uint32_t ra8_jpeg_stream_state_t::win_cap

Window capacity, bytes.

Definition at line 69 of file ra8_jpeg_sw_stream.c.

Referenced by internal_js_begin(), and internal_js_refill().

win_len

uint32_t ra8_jpeg_stream_state_t::win_len

Valid bytes currently in the window.

Definition at line 70 of file ra8_jpeg_sw_stream.c.

Referenced by internal_js_begin(), internal_js_parse_markers(), internal_js_refill(), internal_js_scan(), internal_js_scan_margin(), and internal_js_slide().

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The documentation for this struct was generated from the following file:

• libs/ra8_jpeg/src/ra8_jpeg_sw_stream.c