Topics
	Palette Mode Search

Data Structures
struct	IntraModeSearchState
	Variables related to intra-mode search during inter frame coding. More...

Typedefs
typedef struct IntraModeSearchState	IntraModeSearchState
	Variables related to intra-mode search during inter frame coding.

Functions
int	av1_handle_intra_y_mode (IntraModeSearchState intra_search_state, const AV1_COMP cpi, MACROBLOCK x, BLOCK_SIZE bsize, unsigned int ref_frame_cost, const PICK_MODE_CONTEXT ctx, RD_STATS rd_stats_y, int64_t best_rd, int mode_cost_y, int64_t rd_y, int64_t best_model_rd, int64_t top_intra_model_rd[])
	Evaluate a given luma intra-mode for inter frames.

int	av1_search_intra_uv_modes_in_interframe (IntraModeSearchState intra_search_state, const AV1_COMP cpi, MACROBLOCK x, BLOCK_SIZE bsize, RD_STATS rd_stats, const RD_STATS rd_stats_y, RD_STATS rd_stats_uv, int64_t best_rd)
	Search through all chroma intra-modes for inter frames.

int	av1_search_palette_mode (IntraModeSearchState intra_search_state, const AV1_COMP cpi, MACROBLOCK x, BLOCK_SIZE bsize, unsigned int ref_frame_cost, PICK_MODE_CONTEXT ctx, RD_STATS *this_rd_cost, int64_t best_rd)
	Evaluate luma palette mode for inter frames.

void	av1_search_palette_mode_luma (const AV1_COMP cpi, MACROBLOCK x, BLOCK_SIZE bsize, unsigned int ref_frame_cost, PICK_MODE_CONTEXT ctx, RD_STATS this_rd_cost, int64_t best_rd)
	Evaluate luma palette mode for inter frames.

int64_t	av1_rd_pick_intra_sby_mode (const AV1_COMP const cpi, MACROBLOCK x, int rate, int rate_tokenonly, int64_t distortion, uint8_t skippable, BLOCK_SIZE bsize, int64_t best_rd, PICK_MODE_CONTEXT *ctx)
	Perform intra-mode search on luma channels for intra frames.

int64_t	av1_rd_pick_intra_sbuv_mode (const AV1_COMP const cpi, MACROBLOCK x, int rate, int rate_tokenonly, int64_t distortion, uint8_t skippable, BLOCK_SIZE bsize, TX_SIZE max_tx_size)
	Perform intra-mode search on chroma channels.

static int	rd_pick_filter_intra_sby (const AV1_COMP const cpi, MACROBLOCK x, int rate, int rate_tokenonly, int64_t distortion, uint8_t skippable, BLOCK_SIZE bsize, int mode_cost, PREDICTION_MODE best_mode_so_far, int64_t best_rd, int64_t best_model_rd, PICK_MODE_CONTEXT *ctx)
	Search for the best filter_intra mode when coding intra frame.

static int	rd_pick_intra_angle_sbuv (const AV1_COMP const cpi, MACROBLOCK x, BLOCK_SIZE bsize, int rate_overhead, int64_t best_rd, int rate, RD_STATS rd_stats)
	Search for the best angle delta for chroma prediction.

static int	cfl_rd_pick_alpha (MACROBLOCK const x, const AV1_COMP const cpi, TX_SIZE tx_size, int64_t ref_best_rd, int cfl_search_range, RD_STATS best_rd_stats, uint8_t best_cfl_alpha_idx, int8_t *best_cfl_alpha_signs)
	Pick the optimal parameters for Chroma to Luma (CFL) component.

static int	intra_block_yrd (const AV1_COMP const cpi, MACROBLOCK x, BLOCK_SIZE bsize, const int bmode_costs, int64_t best_rd, int rate, int rate_tokenonly, int64_t distortion, uint8_t skippable, MB_MODE_INFO best_mbmi, PICK_MODE_CONTEXT ctx)
	Get the intra prediction by searching through tx_type and tx_size.

static void	handle_filter_intra_mode (const AV1_COMP cpi, MACROBLOCK x, BLOCK_SIZE bsize, const PICK_MODE_CONTEXT ctx, RD_STATS rd_stats_y, int mode_cost, int64_t best_rd, int64_t best_rd_so_far)
	Search for the best filter_intra mode when coding inter frame.

static int	model_intra_yrd_and_prune (const AV1_COMP const cpi, MACROBLOCK x, BLOCK_SIZE bsize, int64_t *best_model_rd)
	Estimate the luma rdcost of a given intra mode and try to prune it.

static void	hybrid_intra_mode_search (AV1_COMP cpi, MACROBLOCK const x, RD_STATS rd_cost, BLOCK_SIZE bsize, PICK_MODE_CONTEXT ctx)
	Hybrid intra mode search.

void	av1_rd_pick_intra_mode_sb (const struct AV1_COMP cpi, struct macroblock x, struct RD_STATS rd_cost, BLOCK_SIZE bsize, PICK_MODE_CONTEXT ctx, int64_t best_rd)
	AV1 intra mode selection for intra frames.

static int64_t	rd_pick_intrabc_mode_sb (const AV1_COMP cpi, MACROBLOCK x, PICK_MODE_CONTEXT ctx, RD_STATS rd_stats, BLOCK_SIZE bsize, int64_t best_rd)
	Search for the best intrabc predictor.

static void	search_intra_modes_in_interframe (InterModeSearchState search_state, const AV1_COMP cpi, MACROBLOCK x, RD_STATS rd_cost, BLOCK_SIZE bsize, PICK_MODE_CONTEXT ctx, const InterModeSFArgs sf_args, unsigned int intra_ref_frame_cost, int64_t yrd_threshold)
	Search intra modes in interframes.

Detailed Description

This module describes intra mode search algorithm in AV1. More details will be added.

Typedef Documentation

◆ IntraModeSearchState

typedef struct IntraModeSearchState IntraModeSearchState

Variables related to intra-mode search during inter frame coding.

This is a set of variables used during intra-mode search for inter frames. This includes an histogram of gradient speed features and a cache of uv prediction to avoid repeated search of chroma prediction.

Function Documentation

◆ av1_handle_intra_y_mode()

int av1_handle_intra_y_mode	(	IntraModeSearchState *	intra_search_state,
		const AV1_COMP *	cpi,
		MACROBLOCK *	x,
		BLOCK_SIZE	bsize,
		unsigned int	ref_frame_cost,
		const PICK_MODE_CONTEXT *	ctx,
		RD_STATS *	rd_stats_y,
		int64_t	best_rd,
		int *	mode_cost_y,
		int64_t *	rd_y,
		int64_t *	best_model_rd,
		int64_t	top_intra_model_rd[] )

Evaluate a given luma intra-mode for inter frames.

This function handles an intra-mode luma prediction when the current frame is an inter frame. This is the intra-mode counterpart of handle_inter_mode. This function performs an intra luma prediction using the mode specified by x->e_mbd.mi[0]->mode. This function does not support palette mode prediction in the luma channel.

Parameters

[in,out]	intra_search_state	Structure to intra search state.
[in]	cpi	Top-level encoder structure.
[in,out]	x	Pointer to structure holding all the data for the current macroblock.
[in]	bsize	Current partition block size.
[in]	ref_frame_cost	The entropy cost for signaling that the current ref frame is an intra frame.
[in]	ctx	Structure to hold the number of 4x4 blks to copy tx_type and txfm_skip arrays.
[out]	rd_stats_y	Struct to keep track of the current intra-mode's rd_stats (luma only).
[in]	best_rd	Best RD seen for this block so far.
[out]	mode_cost_y	The cost needed to signal the current intra mode.
[out]	rd_y	The rdcost of the chosen mode.
[in]	best_model_rd	Best model RD seen for this block so far
[in]	top_intra_model_rd	Top intra model RD seen for this block so far.

Returns: Returns 1 if a valid intra mode is found, 0 otherwise. The corresponding values in x->e_mbd.mi[0], rd_stats_y, mode_cost_y, and rd_y are also updated. Moreover, in the first evaluation with directional mode, a prune_mask computed with histogram of gradient is also stored in intra_search_state.

References av1_pick_uniform_tx_size_type_yrd(), CommonQuantParams::base_qindex, AV1_COMP::common, IntraModeSearchState::dir_mode_skip_mask_ready, IntraModeSearchState::directional_mode_skip_mask, macroblock::e_mbd, MB_MODE_INFO::filter_intra_mode_info, handle_filter_intra_mode(), intra_mode_info_cost_y(), SPEED_FEATURES::intra_sf, ModeCosts::mbmode_cost, macroblockd::mi, MB_MODE_INFO::mode, macroblock::mode_costs, AV1_COMP::oxcf, AV1Common::quant_params, macroblock::rdmult, MB_MODE_INFO::ref_frame, AV1Common::seq_params, AV1_COMP::sf, IntraModeSearchState::skip_intra_modes, ModeCosts::skip_txfm_cost, and CommonQuantParams::y_dc_delta_q.

Referenced by search_intra_modes_in_interframe().

◆ av1_search_intra_uv_modes_in_interframe()

int av1_search_intra_uv_modes_in_interframe	(	IntraModeSearchState *	intra_search_state,
		const AV1_COMP *	cpi,
		MACROBLOCK *	x,
		BLOCK_SIZE	bsize,
		RD_STATS *	rd_stats,
		const RD_STATS *	rd_stats_y,
		RD_STATS *	rd_stats_uv,
		int64_t	best_rd )

Search through all chroma intra-modes for inter frames.

This function handles intra-mode chroma prediction when the current frame is an inter frame. This is done by calling av1_rd_pick_intra_sbuv_mode with some additional book-keeping.

Parameters

[in,out]	intra_search_state	Structure to intra search state.
[in]	cpi	Top-level encoder structure.
[in,out]	x	Pointer to structure holding all the data for the current macroblock.
[in]	bsize	Current partition block size.
[out]	rd_stats	Struct to keep track of the current intra-mode's rd_stats (all planes).
[out]	rd_stats_y	Struct to keep track of the current intra-mode's rd_stats (luma only).
[out]	rd_stats_uv	Struct to keep track of the current intra-mode's rd_stats (chroma only).
[in]	best_rd	Best RD seen for this block so far.

Returns: Returns 1 if a valid intra mode is found, 0 otherwise. The corresponding values in x->e_mbd.mi[0], rd_stats(_y|_uv) are also updated. Moreover, in the first evocation of the function, the chroma intra mode result is cached in intra_search_state to be used in subsequent calls.

< U (Chroma) plane

Referenced by search_intra_modes_in_interframe().

◆ av1_search_palette_mode()

int av1_search_palette_mode	(	IntraModeSearchState *	intra_search_state,
		const AV1_COMP *	cpi,
		MACROBLOCK *	x,
		BLOCK_SIZE	bsize,
		unsigned int	ref_frame_cost,
		PICK_MODE_CONTEXT *	ctx,
		RD_STATS *	this_rd_cost,
		int64_t	best_rd )

Evaluate luma palette mode for inter frames.

This function handles luma palette mode when the current frame is an inter frame.

Parameters

[in]	intra_search_state	Structure to hold the best luma intra mode and cache chroma prediction for speed up.
[in]	cpi	Top-level encoder structure.
[in]	x	Pointer to structure holding all the data for the current macroblock.
[in]	bsize	Current partition block size.
[in]	ref_frame_cost	The entropy cost for signaling that the current ref frame is an intra frame.
[in]	ctx	Structure to hold the number of 4x4 blks to copy the tx_type and txfm_skip arrays.
[in]	this_rd_cost	Struct to keep track of palette mode's rd_stats.
[in]	best_rd	Best RD seen for this block so far.

Returns: Returns whether luma palette mode can skip the txfm. The corresponding mbmi, this_rd_costs, intra_search_state, and tx_type arrays in ctx are also updated.

< U (Chroma) plane

References MB_MODE_INFO::angle_delta, AOM_PLANE_U, av1_rd_pick_intra_sbuv_mode(), av1_rd_pick_palette_intra_sby(), PALETTE_BUFFER::best_palette_color_map, TxfmSearchInfo::blk_skip, AV1_COMP::common, IntraModeSearchState::dist_uvs, macroblock::e_mbd, ModeCosts::mbmode_cost, macroblockd::mi, MB_MODE_INFO::mode, macroblock::mode_costs, IntraModeSearchState::mode_uv, macroblock::palette_buffer, MB_MODE_INFO::palette_mode_info, macroblockd::plane, IntraModeSearchState::pmi_uv, IntraModeSearchState::rate_uv_intra, IntraModeSearchState::rate_uv_tokenonly, macroblock::rdmult, MB_MODE_INFO::ref_frame, MB_MODE_INFO::skip_txfm, ModeCosts::skip_txfm_cost, IntraModeSearchState::skip_uvs, macroblockd::tx_type_map, macroblock::txfm_search_info, IntraModeSearchState::uv_angle_delta, and MB_MODE_INFO::uv_mode.

Referenced by av1_rd_pick_inter_mode().

◆ av1_search_palette_mode_luma()

void av1_search_palette_mode_luma	(	const AV1_COMP *	cpi,
		MACROBLOCK *	x,
		BLOCK_SIZE	bsize,
		unsigned int	ref_frame_cost,
		PICK_MODE_CONTEXT *	ctx,
		RD_STATS *	this_rd_cost,
		int64_t	best_rd )

Evaluate luma palette mode for inter frames.

This function handles luma palette mode when the current frame is an inter frame.

Parameters

[in]	cpi	Top-level encoder structure.
[in]	x	Pointer to structure holding all the data for the current macroblock.
[in]	bsize	Current partition block size.
[in]	ref_frame_cost	The entropy cost for signaling that the current ref frame is an intra frame.
[in]	ctx	Structure to hold the number of 4x4 blks to copy the tx_type and txfm_skip arrays.
[in]	this_rd_cost	Struct to keep track of palette mode's rd_stats.
[in]	best_rd	Best RD seen for this block so far.

References av1_rd_pick_palette_intra_sby(), PALETTE_BUFFER::best_palette_color_map, TxfmSearchInfo::blk_skip, macroblock::e_mbd, ModeCosts::mbmode_cost, macroblockd::mi, MB_MODE_INFO::mode, macroblock::mode_costs, macroblock::palette_buffer, MB_MODE_INFO::palette_mode_info, macroblockd::plane, macroblock::rdmult, MB_MODE_INFO::ref_frame, MB_MODE_INFO::skip_txfm, ModeCosts::skip_txfm_cost, macroblockd::tx_type_map, macroblock::txfm_search_info, and MB_MODE_INFO::uv_mode.

Referenced by av1_nonrd_pick_intra_mode().

◆ av1_rd_pick_intra_sby_mode()

int64_t av1_rd_pick_intra_sby_mode	(	const AV1_COMP *const	cpi,
		MACROBLOCK *	x,
		int *	rate,
		int *	rate_tokenonly,
		int64_t *	distortion,
		uint8_t *	skippable,
		BLOCK_SIZE	bsize,
		int64_t	best_rd,
		PICK_MODE_CONTEXT *	ctx )

Perform intra-mode search on luma channels for intra frames.

This function performs intra-mode search on the luma channel when the current frame is intra-only. This function does not search intrabc mode, but it does search palette and filter_intra.

Parameters

[in]	cpi	Top-level encoder structure.
[in]	x	Pointer to structure holding all the data for the current macroblock.
[in]	rate	The total rate needed to predict the current chroma block.
[in]	rate_tokenonly	The rate without the cost of sending the prediction modes. chroma block. after the reconstruction.
[in]	distortion	The chroma distortion of the best prediction after the reconstruction.
[in]	skippable	Whether we can skip txfm process.
[in]	bsize	Current partition block size.
[in]	best_rd	Best RD seen for this block so far.
[in]	ctx	Structure to hold the number of 4x4 blks to copy the tx_type and txfm_skip arrays.

Returns: Returns the rd_cost if this function finds a mode better than best_rd, otherwise returns INT64_MAX. This also updates the mbmi, the rate and distortion, and the tx_type arrays in ctx.

< Y (Luminance) plane

References macroblockd::above_mbmi, FeatureFlags::allow_screen_content_tools, MB_MODE_INFO::angle_delta, AOM_PLANE_Y, av1_pick_uniform_tx_size_type_yrd(), av1_rd_pick_palette_intra_sby(), PALETTE_BUFFER::best_palette_color_map, TxfmSearchInfo::blk_skip, MB_MODE_INFO::bsize, WinnerModeStats::color_index_map, AV1_COMP::common, macroblock::e_mbd, IntraModeCfg::enable_angle_delta, IntraModeCfg::enable_diagonal_intra, IntraModeCfg::enable_directional_intra, IntraModeCfg::enable_paeth_intra, IntraModeCfg::enable_smooth_intra, AV1Common::features, MB_MODE_INFO::filter_intra_mode_info, intra_block_yrd(), intra_mode_info_cost_y(), SPEED_FEATURES::intra_sf, macroblockd::left_mbmi, macroblockd::lossless, macroblock::mb_mode_cache, WinnerModeStats::mbmi, macroblockd::mi, MB_MODE_INFO::mode, macroblock::mode_costs, AV1_COMP::oxcf, macroblock::palette_buffer, MB_MODE_INFO::palette_mode_info, macroblockd::plane, rd_pick_filter_intra_sby(), macroblock::rdmult, MB_MODE_INFO::segment_id, AV1Common::seq_params, set_y_mode_and_delta_angle(), AV1_COMP::sf, MB_MODE_INFO::tx_size, macroblockd::tx_type_map, macroblock::txfm_search_info, macroblock::use_mb_mode_cache, macroblock::winner_mode_count, SPEED_FEATURES::winner_mode_sf, macroblock::winner_mode_stats, and ModeCosts::y_mode_costs.

Referenced by av1_rd_pick_intra_mode_sb().

◆ av1_rd_pick_intra_sbuv_mode()

int64_t av1_rd_pick_intra_sbuv_mode	(	const AV1_COMP *const	cpi,
		MACROBLOCK *	x,
		int *	rate,
		int *	rate_tokenonly,
		int64_t *	distortion,
		uint8_t *	skippable,
		BLOCK_SIZE	bsize,
		TX_SIZE	max_tx_size )

Perform intra-mode search on chroma channels.

This function performs intra-mode search on the chroma channels. Just like av1_rd_pick_intra_sby_mode(), this function searches over palette mode (filter_intra is not available on chroma planes). Unlike av1_rd_pick_intra_sby_mode() this function is used by both inter and intra frames.

Parameters

[in]	cpi	Top-level encoder structure.
[in]	x	Pointer to structure holding all the data for the current macroblock.
[in]	rate	The total rate needed to predict the current chroma block.
[in]	rate_tokenonly	The rate without the cost of sending the prediction modes. chroma block. after the reconstruction.
[in]	distortion	The chroma distortion of the best prediction after the reconstruction.
[in]	skippable	Whether we can skip txfm process.
[in]	bsize	Current partition block size.
[in]	max_tx_size	The maximum tx_size available

Returns: Returns the rd_cost of the best uv mode found. This also updates the mbmi, the rate and distortion, distortion.

< Y (Luminance) plane

< U (Chroma) plane

References FeatureFlags::allow_screen_content_tools, MB_MODE_INFO::angle_delta, AOM_PLANE_U, AOM_PLANE_Y, av1_rd_pick_palette_intra_sbuv(), av1_txfm_uvrd(), PALETTE_BUFFER::best_palette_color_map, MB_MODE_INFO::bsize, macroblockd::cfl, MB_MODE_INFO::cfl_alpha_idx, MB_MODE_INFO::cfl_alpha_signs, cfl_rd_pick_alpha(), AV1_COMP::common, IntraModeSearchState::dir_mode_skip_mask_ready, IntraModeSearchState::directional_mode_skip_mask, macroblock::e_mbd, IntraModeCfg::enable_angle_delta, IntraModeCfg::enable_cfl_intra, IntraModeCfg::enable_paeth_intra, IntraModeCfg::enable_smooth_intra, AV1Common::features, init_intra_mode_search_state(), intra_mode_info_cost_uv(), SPEED_FEATURES::intra_sf, ModeCosts::intra_uv_mode_cost, macroblockd::is_chroma_ref, macroblockd::mi, MB_MODE_INFO::mode, macroblock::mode_costs, AV1_COMP::optimize_seg_arr, AV1_COMP::oxcf, macroblock::palette_buffer, rd_pick_intra_angle_sbuv(), macroblock::rdmult, MB_MODE_INFO::segment_id, AV1Common::seq_params, AV1_COMP::sf, MB_MODE_INFO::skip_txfm, and MB_MODE_INFO::uv_mode.

Referenced by av1_rd_pick_intra_mode_sb(), av1_search_intra_uv_modes_in_interframe(), and av1_search_palette_mode().

◆ rd_pick_filter_intra_sby()

static int rd_pick_filter_intra_sby	(	const AV1_COMP *const	cpi,
		MACROBLOCK *	x,
		int *	rate,
		int *	rate_tokenonly,
		int64_t *	distortion,
		uint8_t *	skippable,
		BLOCK_SIZE	bsize,
		int	mode_cost,
		PREDICTION_MODE	best_mode_so_far,
		int64_t *	best_rd,
		int64_t *	best_model_rd,
		PICK_MODE_CONTEXT *	ctx )

static

Search for the best filter_intra mode when coding intra frame.

This function loops through all filter_intra modes to find the best one.

Returns: Returns 1 if a new filter_intra mode is selected; 0 otherwise.

References av1_pick_uniform_tx_size_type_yrd(), TxfmSearchInfo::blk_skip, AV1_COMP::common, macroblock::e_mbd, MB_MODE_INFO::filter_intra_mode_info, intra_mode_info_cost_y(), SPEED_FEATURES::intra_sf, macroblock::mb_mode_cache, macroblockd::mi, MB_MODE_INFO::mode, model_intra_yrd_and_prune(), AV1_COMP::oxcf, MB_MODE_INFO::palette_mode_info, macroblock::rdmult, AV1_COMP::sf, MB_MODE_INFO::tx_size, macroblockd::tx_type_map, macroblock::txfm_search_info, macroblock::use_mb_mode_cache, and SPEED_FEATURES::winner_mode_sf.

Referenced by av1_rd_pick_intra_sby_mode().

◆ rd_pick_intra_angle_sbuv()

static int rd_pick_intra_angle_sbuv	(	const AV1_COMP *const	cpi,
		MACROBLOCK *	x,
		BLOCK_SIZE	bsize,
		int	rate_overhead,
		int64_t	best_rd,
		int *	rate,
		RD_STATS *	rd_stats )

static

Search for the best angle delta for chroma prediction.

Given a chroma directional intra prediction mode, this function will try to estimate the best delta_angle.

Returns: Return if there is a new mode with smaller rdcost than best_rd.

References MB_MODE_INFO::angle_delta, macroblock::e_mbd, and macroblockd::mi.

Referenced by av1_rd_pick_intra_sbuv_mode().

◆ cfl_rd_pick_alpha()

static int cfl_rd_pick_alpha	(	MACROBLOCK *const	x,
		const AV1_COMP *const	cpi,
		TX_SIZE	tx_size,
		int64_t	ref_best_rd,
		int	cfl_search_range,
		RD_STATS *	best_rd_stats,
		uint8_t *	best_cfl_alpha_idx,
		int8_t *	best_cfl_alpha_signs )

static

Pick the optimal parameters for Chroma to Luma (CFL) component.

This function will use DCT_DCT followed by computing SATD (sum of absolute transformed differences) to estimate the RD score and find the best possible CFL parameter.

Then the function will apply a full RD search near the best possible CFL parameter to find the best actual CFL parameter.

Side effect: We use ths buffers in x->plane[] and xd->plane[] as throw-away buffers for RD search.

Parameters

[in]	x	Encoder prediction block structure.
[in]	cpi	Top-level encoder instance structure.
[in]	tx_size	Transform size.
[in]	ref_best_rd	Reference best RD.
[in]	cfl_search_range	The search range of full RD search near the estimated best CFL parameter.
[out]	best_rd_stats	RD stats of the best CFL parameter
[out]	best_cfl_alpha_idx	Best CFL alpha index
[out]	best_cfl_alpha_signs	Best CFL joint signs

References macroblockd::cfl, ModeCosts::cfl_cost, macroblock::e_mbd, ModeCosts::intra_uv_mode_cost, macroblockd::mi, MB_MODE_INFO::mode, macroblock::mode_costs, and macroblock::rdmult.

Referenced by av1_rd_pick_intra_sbuv_mode().

◆ intra_block_yrd()

static int intra_block_yrd	(	const AV1_COMP *const	cpi,
		MACROBLOCK *	x,
		BLOCK_SIZE	bsize,
		const int *	bmode_costs,
		int64_t *	best_rd,
		int *	rate,
		int *	rate_tokenonly,
		int64_t *	distortion,
		uint8_t *	skippable,
		MB_MODE_INFO *	best_mbmi,
		PICK_MODE_CONTEXT *	ctx )

inlinestatic

Get the intra prediction by searching through tx_type and tx_size.

Currently this function is only used in the intra frame code path for winner-mode processing.

Returns: Returns whether the current mode is an improvement over best_rd.

References av1_pick_uniform_tx_size_type_yrd(), TxfmSearchInfo::blk_skip, MB_MODE_INFO::bsize, macroblock::e_mbd, intra_mode_info_cost_y(), macroblockd::lossless, macroblockd::mi, MB_MODE_INFO::mode, macroblock::rdmult, MB_MODE_INFO::segment_id, AV1_COMP::sf, MB_MODE_INFO::skip_txfm, SPEED_FEATURES::tx_sf, MB_MODE_INFO::tx_size, macroblockd::tx_type_map, and macroblock::txfm_search_info.

Referenced by av1_rd_pick_intra_sby_mode().

◆ handle_filter_intra_mode()

static void handle_filter_intra_mode	(	const AV1_COMP *	cpi,
		MACROBLOCK *	x,
		BLOCK_SIZE	bsize,
		const PICK_MODE_CONTEXT *	ctx,
		RD_STATS *	rd_stats_y,
		int	mode_cost,
		int64_t	best_rd,
		int64_t	best_rd_so_far )

inlinestatic

Search for the best filter_intra mode when coding inter frame.

This function loops through all filter_intra modes to find the best one.

Remarks: Returns nothing, but updates the mbmi and rd_stats.

References av1_pick_uniform_tx_size_type_yrd(), TxfmSearchInfo::blk_skip, AV1_COMP::common, macroblock::e_mbd, MB_MODE_INFO::filter_intra_mode_info, intra_mode_info_cost_y(), macroblockd::mi, MB_MODE_INFO::mode, macroblock::rdmult, MB_MODE_INFO::tx_size, macroblockd::tx_type_map, and macroblock::txfm_search_info.

Referenced by av1_handle_intra_y_mode().

◆ model_intra_yrd_and_prune()

static int model_intra_yrd_and_prune	(	const AV1_COMP *const	cpi,
		MACROBLOCK *	x,
		BLOCK_SIZE	bsize,
		int64_t *	best_model_rd )

inlinestatic

Estimate the luma rdcost of a given intra mode and try to prune it.

This function first makes a quick luma prediction and estimates the rdcost with a model without going through the txfm, then try to prune the current mode if the new estimate y_rd > 1.25 * best_model_rd.

Returns: Returns 1 if the given mode is prune; 0 otherwise.

References AV1_COMP::common.

Referenced by rd_pick_filter_intra_sby().

◆ hybrid_intra_mode_search()

static void hybrid_intra_mode_search	(	AV1_COMP *	cpi,
		MACROBLOCK *const	x,
		RD_STATS *	rd_cost,
		BLOCK_SIZE	bsize,
		PICK_MODE_CONTEXT *	ctx )

inlinestatic

Hybrid intra mode search.

This is top level function for mode search for intra frames in non-RD optimized case. Depending on speed feature and block size it calls either non-RD or RD optimized intra mode search.

Parameters

[in]	cpi	Top-level encoder structure
[in]	x	Pointer to structure holding all the data for the current macroblock
[in]	rd_cost	Struct to keep track of the RD information
[in]	bsize	Current block size
[in]	ctx	Structure to hold snapshot of coding context during the mode picking process

Remarks: Nothing is returned. Instead, the MB_MODE_INFO struct inside x is modified to store information about the best mode computed in this function. The rd_cost struct is also updated with the RD stats corresponding to the best mode found.

References av1_nonrd_pick_intra_mode(), av1_rd_pick_intra_mode_sb(), SPEED_FEATURES::rt_sf, AV1_COMP::sf, and macroblock::source_variance.

Referenced by pick_sb_modes_nonrd().

◆ av1_rd_pick_intra_mode_sb()

void av1_rd_pick_intra_mode_sb	(	const struct AV1_COMP *	cpi,
		struct macroblock *	x,
		struct RD_STATS *	rd_cost,
		BLOCK_SIZE	bsize,
		PICK_MODE_CONTEXT *	ctx,
		int64_t	best_rd )

AV1 intra mode selection for intra frames.

Top level function for rd-based intra mode selection during intra frame encoding. This function will first search for the best luma prediction by calling av1_rd_pick_intra_sby_mode, then it searches for chroma prediction with av1_rd_pick_intra_sbuv_mode. If applicable, this function ends the search with an evaluation for intrabc.

Parameters

[in]	cpi	Top-level encoder structure.
[in]	x	Pointer to structure holding all the data for the current macroblock.
[in]	rd_cost	Struct to keep track of the RD information.
[in]	bsize	Current block size.
[in]	ctx	Structure to hold snapshot of coding context during the mode picking process.
[in]	best_rd	Best RD seen for this block so far.

Remarks: Nothing is returned. Instead, the MB_MODE_INFO struct inside x is modified to store information about the best mode computed in this function. The rd_cost struct is also updated with the RD stats corresponding to the best mode found.

< U (Chroma) plane

References AOM_PLANE_U, av1_rd_pick_intra_sbuv_mode(), av1_rd_pick_intra_sby_mode(), TxfmSearchInfo::blk_skip, AV1_COMP::common, macroblock::e_mbd, macroblockd::is_chroma_ref, macroblock::mbmi_ext, macroblockd::mi, macroblock::mode_costs, MB_MODE_INFO::mv, rd_pick_intrabc_mode_sb(), macroblock::rdmult, MB_MODE_INFO::ref_frame, MB_MODE_INFO::skip_mode, MB_MODE_INFO::skip_txfm, TxfmSearchInfo::skip_txfm, ModeCosts::skip_txfm_cost, macroblockd::tx_type_map, macroblock::txfm_search_info, and MB_MODE_INFO::use_intrabc.

Referenced by hybrid_intra_mode_search(), and pick_sb_modes().

◆ rd_pick_intrabc_mode_sb()

static int64_t rd_pick_intrabc_mode_sb	(	const AV1_COMP *	cpi,
		MACROBLOCK *	x,
		PICK_MODE_CONTEXT *	ctx,
		RD_STATS *	rd_stats,
		BLOCK_SIZE	bsize,
		int64_t	best_rd )

static

Search for the best intrabc predictor.

This function performs a motion search to find the best intrabc predictor.

Returns: Returns the best overall rdcost (including the non-intrabc modes search before this function).

References av1_txfm_search(), TxfmSearchInfo::blk_skip, AV1_COMP::common, macroblockd::cur_buf, IntraBCMVCosts::dv_costs, macroblock::dv_costs, macroblock::e_mbd, KeyFrameCfg::enable_intrabc, MB_MODE_INFO::filter_intra_mode_info, MB_MODE_INFO_EXT::global_mvs, macroblockd::height, MB_MODE_INFO::interp_filters, ModeCosts::intrabc_cost, macroblock::intrabc_hash_info, IntraBCMVCosts::joint_mv, AV1EncoderConfig::kf_cfg, macroblock::mbmi_ext, macroblockd::mi, macroblockd::mi_col, macroblockd::mi_row, MB_MODE_INFO::mode, MB_MODE_INFO_EXT::mode_context, macroblock::mode_costs, MB_MODE_INFO::motion_mode, MB_MODE_INFO::mv, AV1_COMP::mv_search_params, SPEED_FEATURES::mv_sf, MotionVectorSearchParams::mv_step_param, AV1_COMP::oxcf, MB_MODE_INFO::palette_mode_info, macroblockd::plane, macroblock::rdmult, MB_MODE_INFO_EXT::ref_mv_count, macroblockd::ref_mv_stack, MB_MODE_INFO_EXT::ref_mv_stack, SPEED_FEATURES::rt_sf, MotionVectorSearchParams::search_site_cfg, AV1Common::seq_params, AV1_COMP::sf, MB_MODE_INFO::skip_txfm, macroblockd::tile, macroblockd::tx_type_map, macroblock::txfm_search_info, MB_MODE_INFO::use_intrabc, MB_MODE_INFO::uv_mode, macroblockd::weight, and macroblockd::width.

Referenced by av1_rd_pick_intra_mode_sb().

◆ search_intra_modes_in_interframe()

static void search_intra_modes_in_interframe	(	InterModeSearchState *	search_state,
		const AV1_COMP *	cpi,
		MACROBLOCK *	x,
		RD_STATS *	rd_cost,
		BLOCK_SIZE	bsize,
		PICK_MODE_CONTEXT *	ctx,
		const InterModeSFArgs *	sf_args,
		unsigned int	intra_ref_frame_cost,
		int64_t	yrd_threshold )

inlinestatic

Search intra modes in interframes.

This function searches for the best intra mode when the current frame is an interframe. This function however does not handle luma palette mode. Palette mode is currently handled by av1_search_palette_mode.

This function will first iterate through the luma mode candidates to find the best luma intra mode. Once the best luma mode it's found, it will then search for the best chroma mode. Because palette mode is currently not handled by here, a cache of uv mode is stored in InterModeSearchState::intra_search_state so it can be reused later by av1_search_palette_mode.

Parameters

[in,out]	search_state	Struct keep track of the prediction mode search state in interframe.
[in]	cpi	Top-level encoder structure.
[in,out]	x	Pointer to struct holding all the data for the current prediction block.
[out]	rd_cost	Stores the best rd_cost among all the prediction modes searched.
[in]	bsize	Current block size.
[in,out]	ctx	Structure to hold the number of 4x4 blks to copy the tx_type and txfm_skip arrays. for only the Y plane.
[in]	sf_args	Stores the list of intra mode candidates to be searched.
[in]	intra_ref_frame_cost	The entropy cost for signaling that the current ref frame is an intra frame.
[in]	yrd_threshold	The rdcost threshold for luma intra mode to terminate chroma intra mode search.

Remarks: If a new best mode is found, search_state and rd_costs are updated correspondingly. While x is also modified, it is only used as a temporary buffer, and the final decisions are stored in search_state.

References MB_MODE_INFO::angle_delta, av1_handle_intra_y_mode(), av1_search_intra_uv_modes_in_interframe(), IntraModeSearchState::best_intra_mode, TxfmSearchInfo::blk_skip, AV1_COMP::common, macroblock::e_mbd, IntraModeCfg::enable_angle_delta, IntraModeCfg::enable_paeth_intra, IntraModeCfg::enable_smooth_intra, intra_mode_info_cost_uv(), SPEED_FEATURES::intra_sf, ModeCosts::intra_uv_mode_cost, macroblockd::is_chroma_ref, macroblockd::lossless, macroblockd::mi, MB_MODE_INFO::mode, macroblock::mode_costs, AV1_COMP::oxcf, macroblock::rdmult, SPEED_FEATURES::rt_sf, MB_MODE_INFO::segment_id, set_y_mode_and_delta_angle(), AV1_COMP::sf, TxfmSearchInfo::skip_txfm, ModeCosts::skip_txfm_cost, MB_MODE_INFO::tx_size, macroblockd::tx_type_map, macroblock::txfm_search_info, MB_MODE_INFO::uv_mode, and SPEED_FEATURES::winner_mode_sf.

Referenced by av1_rd_pick_inter_mode().

Topics

Data Structures

Typedefs

Functions

Detailed Description

Typedef Documentation

◆ IntraModeSearchState

Function Documentation

◆ av1_handle_intra_y_mode()

◆ av1_search_intra_uv_modes_in_interframe()

◆ av1_search_palette_mode()

◆ av1_search_palette_mode_luma()

◆ av1_rd_pick_intra_sby_mode()

◆ av1_rd_pick_intra_sbuv_mode()

◆ rd_pick_filter_intra_sby()

◆ rd_pick_intra_angle_sbuv()

◆ cfl_rd_pick_alpha()

◆ intra_block_yrd()

◆ handle_filter_intra_mode()

◆ model_intra_yrd_and_prune()

◆ hybrid_intra_mode_search()

◆ av1_rd_pick_intra_mode_sb()

◆ rd_pick_intrabc_mode_sb()

◆ search_intra_modes_in_interframe()