/*
 * Copyright 2011 Advanced Micro Devices, Inc.
 * Authors:
 *	Christian König <christian.koenig@amd.com>
 * SPDX-License-Identifier: MIT
 */

#include <sys/types.h>
#include <assert.h>
#include <errno.h>
#include <unistd.h>
#include <stdio.h>

#include "pipe/p_video_codec.h"

#include "util/u_memory.h"
#include "util/u_video.h"
#include "util/vl_zscan_data.h"

#include "vl/vl_defines.h"

#include "r600_pipe_common.h"
#include "radeon_video.h"
#include "radeon_uvd.h"

#define NUM_BUFFERS 4

#define NUM_MPEG2_REFS 6
#define NUM_H264_REFS 17
#define NUM_VC1_REFS 5

#define FB_BUFFER_OFFSET 0x1000
#define FB_BUFFER_SIZE 2048
#define FB_BUFFER_SIZE_TONGA (2048 * 64)
#define IT_SCALING_TABLE_SIZE 992
#define UVD_SESSION_CONTEXT_SIZE (128 * 1024)

/* UVD decoder representation */
struct ruvd_decoder {
	struct pipe_video_codec		base;

	ruvd_set_dtb			set_dtb;

	unsigned			stream_handle;
	unsigned			stream_type;
	unsigned			frame_number;

	struct pipe_screen		*screen;
	struct radeon_winsys*		ws;
	struct radeon_cmdbuf	cs;

	unsigned			cur_buffer;

	struct rvid_buffer		msg_fb_it_buffers[NUM_BUFFERS];
	struct ruvd_msg			*msg;
	uint32_t			*fb;
	unsigned			fb_size;
	uint8_t				*it;

	struct rvid_buffer		bs_buffers[NUM_BUFFERS];
	void*				bs_ptr;
	unsigned			bs_size;

	struct rvid_buffer		dpb;
	bool				use_legacy;
	struct rvid_buffer		ctx;
	struct rvid_buffer		sessionctx;
	struct {
		unsigned 		data0;
		unsigned		data1;
		unsigned		cmd;
		unsigned		cntl;
	} reg;
};

/* flush IB to the hardware */
static int flush(struct ruvd_decoder *dec, unsigned flags,
				 struct pipe_fence_handle **fence) {
	return dec->ws->cs_flush(&dec->cs, flags, fence);
}

/* add a new set register command to the IB */
static void set_reg(struct ruvd_decoder *dec, unsigned reg, uint32_t val)
{
	radeon_emit(&dec->cs, RUVD_PKT0(reg >> 2, 0));
	radeon_emit(&dec->cs, val);
}

/* send a command to the VCPU through the GPCOM registers */
static void send_cmd(struct ruvd_decoder *dec, unsigned cmd,
		     struct pb_buffer_lean* buf, uint32_t off,
		     unsigned usage, enum radeon_bo_domain domain)
{
	int reloc_idx;

	reloc_idx = dec->ws->cs_add_buffer(&dec->cs, buf, usage | RADEON_USAGE_SYNCHRONIZED,
					   domain);
	if (!dec->use_legacy) {
		uint64_t addr;
		addr = dec->ws->buffer_get_virtual_address(buf);
		addr = addr + off;
		set_reg(dec, dec->reg.data0, addr);
		set_reg(dec, dec->reg.data1, addr >> 32);
	} else {
		off += dec->ws->buffer_get_reloc_offset(buf);
		set_reg(dec, RUVD_GPCOM_VCPU_DATA0, off);
		set_reg(dec, RUVD_GPCOM_VCPU_DATA1, reloc_idx * 4);
	}
	set_reg(dec, dec->reg.cmd, cmd << 1);
}

/* do the codec needs an IT buffer ?*/
static bool have_it(struct ruvd_decoder *dec)
{
	return dec->stream_type == RUVD_CODEC_H264_PERF ||
		dec->stream_type == RUVD_CODEC_H265;
}

/* map the next available message/feedback/itscaling buffer */
static void map_msg_fb_it_buf(struct ruvd_decoder *dec)
{
	struct rvid_buffer* buf;
	uint8_t *ptr;

	/* grab the current message/feedback buffer */
	buf = &dec->msg_fb_it_buffers[dec->cur_buffer];

	/* and map it for CPU access */
	ptr = dec->ws->buffer_map(dec->ws, buf->res->buf, &dec->cs,
                                  PIPE_MAP_WRITE | RADEON_MAP_TEMPORARY);

	/* calc buffer offsets */
	dec->msg = (struct ruvd_msg *)ptr;
	memset(dec->msg, 0, sizeof(*dec->msg));

	dec->fb = (uint32_t *)(ptr + FB_BUFFER_OFFSET);
	if (have_it(dec))
		dec->it = (uint8_t *)(ptr + FB_BUFFER_OFFSET + dec->fb_size);
}

/* unmap and send a message command to the VCPU */
static void send_msg_buf(struct ruvd_decoder *dec)
{
	struct rvid_buffer* buf;

	/* ignore the request if message/feedback buffer isn't mapped */
	if (!dec->msg || !dec->fb)
		return;

	/* grab the current message buffer */
	buf = &dec->msg_fb_it_buffers[dec->cur_buffer];

	/* unmap the buffer */
	dec->ws->buffer_unmap(dec->ws, buf->res->buf);
	dec->bs_ptr = NULL;
	dec->msg = NULL;
	dec->fb = NULL;
	dec->it = NULL;


	if (dec->sessionctx.res)
		send_cmd(dec, RUVD_CMD_SESSION_CONTEXT_BUFFER,
			 dec->sessionctx.res->buf, 0, RADEON_USAGE_READWRITE,
			 RADEON_DOMAIN_VRAM);

	/* and send it to the hardware */
	send_cmd(dec, RUVD_CMD_MSG_BUFFER, buf->res->buf, 0,
		 RADEON_USAGE_READ, RADEON_DOMAIN_GTT);
}

/* cycle to the next set of buffers */
static void next_buffer(struct ruvd_decoder *dec)
{
	++dec->cur_buffer;
	dec->cur_buffer %= NUM_BUFFERS;
}

/* convert the profile into something UVD understands */
static uint32_t profile2stream_type(struct ruvd_decoder *dec, unsigned family)
{
	switch (u_reduce_video_profile(dec->base.profile)) {
	case PIPE_VIDEO_FORMAT_MPEG4_AVC:
		return RUVD_CODEC_H264;

	case PIPE_VIDEO_FORMAT_VC1:
		return RUVD_CODEC_VC1;

	case PIPE_VIDEO_FORMAT_MPEG12:
		return RUVD_CODEC_MPEG2;

	case PIPE_VIDEO_FORMAT_JPEG:
		return RUVD_CODEC_MJPEG;

	default:
		assert(0);
		return 0;
	}
}


static unsigned get_db_pitch_alignment(struct ruvd_decoder *dec)
{
	return 16;
}

/* calculate size of reference picture buffer */
static unsigned calc_dpb_size(struct ruvd_decoder *dec)
{
	unsigned width_in_mb, height_in_mb, image_size, dpb_size;

	// always align them to MB size for dpb calculation
	unsigned width = align(dec->base.width, VL_MACROBLOCK_WIDTH);
	unsigned height = align(dec->base.height, VL_MACROBLOCK_HEIGHT);

	// always one more for currently decoded picture
	unsigned max_references = dec->base.max_references + 1;

	// aligned size of a single frame
	image_size = align(width, get_db_pitch_alignment(dec)) * height;
	image_size += image_size / 2;
	image_size = align(image_size, 1024);

	// picture width & height in 16 pixel units
	width_in_mb = width / VL_MACROBLOCK_WIDTH;
	height_in_mb = align(height / VL_MACROBLOCK_HEIGHT, 2);

	switch (u_reduce_video_profile(dec->base.profile)) {
	case PIPE_VIDEO_FORMAT_MPEG4_AVC: {
		if (!dec->use_legacy) {
			unsigned fs_in_mb = width_in_mb * height_in_mb;
			unsigned alignment = 64, num_dpb_buffer_lean;

			if (dec->stream_type == RUVD_CODEC_H264_PERF)
				alignment = 256;
			switch(dec->base.level) {
			case 30:
				num_dpb_buffer_lean = 8100 / fs_in_mb;
				break;
			case 31:
				num_dpb_buffer_lean = 18000 / fs_in_mb;
				break;
			case 32:
				num_dpb_buffer_lean = 20480 / fs_in_mb;
				break;
			case 41:
				num_dpb_buffer_lean = 32768 / fs_in_mb;
				break;
			case 42:
				num_dpb_buffer_lean = 34816 / fs_in_mb;
				break;
			case 50:
				num_dpb_buffer_lean = 110400 / fs_in_mb;
				break;
			case 51:
				num_dpb_buffer_lean = 184320 / fs_in_mb;
				break;
			default:
				num_dpb_buffer_lean = 184320 / fs_in_mb;
				break;
			}
			num_dpb_buffer_lean++;
			max_references = MAX2(MIN2(NUM_H264_REFS, num_dpb_buffer_lean), max_references);
			dpb_size = image_size * max_references;
			if ((dec->stream_type != RUVD_CODEC_H264_PERF)) {
				dpb_size += max_references * align(width_in_mb * height_in_mb  * 192, alignment);
				dpb_size += align(width_in_mb * height_in_mb * 32, alignment);
			}
		} else {
			// the firmware seems to always assume a minimum of ref frames
			max_references = MAX2(NUM_H264_REFS, max_references);
			// reference picture buffer
			dpb_size = image_size * max_references;
			if ((dec->stream_type != RUVD_CODEC_H264_PERF)) {
				// macroblock context buffer
				dpb_size += width_in_mb * height_in_mb * max_references * 192;
				// IT surface buffer
				dpb_size += width_in_mb * height_in_mb * 32;
			}
		}
		break;
	}

	case PIPE_VIDEO_FORMAT_VC1:
		// the firmware seems to always assume a minimum of ref frames
		max_references = MAX2(NUM_VC1_REFS, max_references);

		// reference picture buffer
		dpb_size = image_size * max_references;

		// CONTEXT_BUFFER
		dpb_size += width_in_mb * height_in_mb * 128;

		// IT surface buffer
		dpb_size += width_in_mb * 64;

		// DB surface buffer
		dpb_size += width_in_mb * 128;

		// BP
		dpb_size += align(MAX2(width_in_mb, height_in_mb) * 7 * 16, 64);
		break;

	case PIPE_VIDEO_FORMAT_MPEG12:
		// reference picture buffer, must be big enough for all frames
		dpb_size = image_size * NUM_MPEG2_REFS;
		break;

	case PIPE_VIDEO_FORMAT_JPEG:
		dpb_size = 0;
		break;

	default:
		// something is missing here
		assert(0);

		// at least use a sane default value
		dpb_size = 32 * 1024 * 1024;
		break;
	}
	return dpb_size;
}

/* free associated data in the video buffer callback */
static void ruvd_destroy_associated_data(void *data)
{
	/* NOOP, since we only use an intptr */
}

/* get h264 specific message bits */
static struct ruvd_h264 get_h264_msg(struct ruvd_decoder *dec, struct pipe_h264_picture_desc *pic)
{
	struct ruvd_h264 result;

	memset(&result, 0, sizeof(result));
	switch (pic->base.profile) {
	case PIPE_VIDEO_PROFILE_MPEG4_AVC_BASELINE:
	case PIPE_VIDEO_PROFILE_MPEG4_AVC_CONSTRAINED_BASELINE:
		result.profile = RUVD_H264_PROFILE_BASELINE;
		break;

	case PIPE_VIDEO_PROFILE_MPEG4_AVC_MAIN:
		result.profile = RUVD_H264_PROFILE_MAIN;
		break;

	case PIPE_VIDEO_PROFILE_MPEG4_AVC_HIGH:
		result.profile = RUVD_H264_PROFILE_HIGH;
		break;

	default:
		assert(0);
		break;
	}

	result.level = dec->base.level;

	result.sps_info_flags = 0;
	result.sps_info_flags |= pic->pps->sps->direct_8x8_inference_flag << 0;
	result.sps_info_flags |= pic->pps->sps->mb_adaptive_frame_field_flag << 1;
	result.sps_info_flags |= pic->pps->sps->frame_mbs_only_flag << 2;
	result.sps_info_flags |= pic->pps->sps->delta_pic_order_always_zero_flag << 3;

	result.bit_depth_luma_minus8 = pic->pps->sps->bit_depth_luma_minus8;
	result.bit_depth_chroma_minus8 = pic->pps->sps->bit_depth_chroma_minus8;
	result.log2_max_frame_num_minus4 = pic->pps->sps->log2_max_frame_num_minus4;
	result.pic_order_cnt_type = pic->pps->sps->pic_order_cnt_type;
	result.log2_max_pic_order_cnt_lsb_minus4 = pic->pps->sps->log2_max_pic_order_cnt_lsb_minus4;
	result.chroma_format = pic->pps->sps->chroma_format_idc;

	result.pps_info_flags = 0;
	result.pps_info_flags |= pic->pps->transform_8x8_mode_flag << 0;
	result.pps_info_flags |= pic->pps->redundant_pic_cnt_present_flag << 1;
	result.pps_info_flags |= pic->pps->constrained_intra_pred_flag << 2;
	result.pps_info_flags |= pic->pps->deblocking_filter_control_present_flag << 3;
	result.pps_info_flags |= pic->pps->weighted_bipred_idc << 4;
	result.pps_info_flags |= pic->pps->weighted_pred_flag << 6;
	result.pps_info_flags |= pic->pps->bottom_field_pic_order_in_frame_present_flag << 7;
	result.pps_info_flags |= pic->pps->entropy_coding_mode_flag << 8;

	result.num_slice_groups_minus1 = pic->pps->num_slice_groups_minus1;
	result.slice_group_map_type = pic->pps->slice_group_map_type;
	result.slice_group_change_rate_minus1 = pic->pps->slice_group_change_rate_minus1;
	result.pic_init_qp_minus26 = pic->pps->pic_init_qp_minus26;
	result.chroma_qp_index_offset = pic->pps->chroma_qp_index_offset;
	result.second_chroma_qp_index_offset = pic->pps->second_chroma_qp_index_offset;

	memcpy(result.scaling_list_4x4, pic->pps->ScalingList4x4, 6*16);
	memcpy(result.scaling_list_8x8, pic->pps->ScalingList8x8, 2*64);

	if (dec->stream_type == RUVD_CODEC_H264_PERF) {
		memcpy(dec->it, result.scaling_list_4x4, 6*16);
		memcpy((dec->it + 96), result.scaling_list_8x8, 2*64);
	}

	result.num_ref_frames = pic->num_ref_frames;

	result.num_ref_idx_l0_active_minus1 = pic->num_ref_idx_l0_active_minus1;
	result.num_ref_idx_l1_active_minus1 = pic->num_ref_idx_l1_active_minus1;

	result.frame_num = pic->frame_num;
	memcpy(result.frame_num_list, pic->frame_num_list, 4*16);
	result.curr_field_order_cnt_list[0] = pic->field_order_cnt[0];
	result.curr_field_order_cnt_list[1] = pic->field_order_cnt[1];
	memcpy(result.field_order_cnt_list, pic->field_order_cnt_list, 4*16*2);

	result.decoded_pic_idx = pic->frame_num;

	return result;
}

/* get vc1 specific message bits */
static struct ruvd_vc1 get_vc1_msg(struct pipe_vc1_picture_desc *pic)
{
	struct ruvd_vc1 result;

	memset(&result, 0, sizeof(result));

	switch(pic->base.profile) {
	case PIPE_VIDEO_PROFILE_VC1_SIMPLE:
		result.profile = RUVD_VC1_PROFILE_SIMPLE;
		result.level = 1;
		break;

	case PIPE_VIDEO_PROFILE_VC1_MAIN:
		result.profile = RUVD_VC1_PROFILE_MAIN;
		result.level = 2;
		break;

	case PIPE_VIDEO_PROFILE_VC1_ADVANCED:
		result.profile = RUVD_VC1_PROFILE_ADVANCED;
		result.level = 4;
		break;

	default:
		assert(0);
	}

	/* fields common for all profiles */
	result.sps_info_flags |= pic->postprocflag << 7;
	result.sps_info_flags |= pic->pulldown << 6;
	result.sps_info_flags |= pic->interlace << 5;
	result.sps_info_flags |= pic->tfcntrflag << 4;
	result.sps_info_flags |= pic->finterpflag << 3;
	result.sps_info_flags |= pic->psf << 1;

	result.pps_info_flags |= pic->range_mapy_flag << 31;
	result.pps_info_flags |= pic->range_mapy << 28;
	result.pps_info_flags |= pic->range_mapuv_flag << 27;
	result.pps_info_flags |= pic->range_mapuv << 24;
	result.pps_info_flags |= pic->multires << 21;
	result.pps_info_flags |= pic->maxbframes << 16;
	result.pps_info_flags |= pic->overlap << 11;
	result.pps_info_flags |= pic->quantizer << 9;
	result.pps_info_flags |= pic->panscan_flag << 7;
	result.pps_info_flags |= pic->refdist_flag << 6;
	result.pps_info_flags |= pic->vstransform << 0;

	/* some fields only apply to main/advanced profile */
	if (pic->base.profile != PIPE_VIDEO_PROFILE_VC1_SIMPLE) {
		result.pps_info_flags |= pic->syncmarker << 20;
		result.pps_info_flags |= pic->rangered << 19;
		result.pps_info_flags |= pic->loopfilter << 5;
		result.pps_info_flags |= pic->fastuvmc << 4;
		result.pps_info_flags |= pic->extended_mv << 3;
		result.pps_info_flags |= pic->extended_dmv << 8;
		result.pps_info_flags |= pic->dquant << 1;
	}

	result.chroma_format = 1;

#if 0
//(((unsigned int)(pPicParams->advance.reserved1))        << SPS_INFO_VC1_RESERVED_SHIFT)
uint32_t 	slice_count
uint8_t 	picture_type
uint8_t 	frame_coding_mode
uint8_t 	deblockEnable
uint8_t 	pquant
#endif

	return result;
}

/* extract the frame number from a referenced video buffer */
static uint32_t get_ref_pic_idx(struct ruvd_decoder *dec, struct pipe_video_buffer *ref)
{
	uint32_t min = MAX2(dec->frame_number, NUM_MPEG2_REFS) - NUM_MPEG2_REFS;
	uint32_t max = MAX2(dec->frame_number, 1) - 1;
	uintptr_t frame;

	/* seems to be the most sane fallback */
	if (!ref)
		return max;

	/* get the frame number from the associated data */
	frame = (uintptr_t)vl_video_buffer_get_associated_data(ref, &dec->base);

	/* limit the frame number to a valid range */
	return MAX2(MIN2(frame, max), min);
}

/* get mpeg2 specific msg bits */
static struct ruvd_mpeg2 get_mpeg2_msg(struct ruvd_decoder *dec,
				       struct pipe_mpeg12_picture_desc *pic)
{
	const int *zscan = pic->alternate_scan ? vl_zscan_alternate : vl_zscan_normal;
	struct ruvd_mpeg2 result;
	unsigned i;

	memset(&result, 0, sizeof(result));
	result.decoded_pic_idx = dec->frame_number;
	for (i = 0; i < 2; ++i)
		result.ref_pic_idx[i] = get_ref_pic_idx(dec, pic->ref[i]);

	result.load_intra_quantiser_matrix = 1;
	result.load_nonintra_quantiser_matrix = 1;

	for (i = 0; i < 64; ++i) {
		result.intra_quantiser_matrix[i] = pic->intra_matrix[zscan[i]];
		result.nonintra_quantiser_matrix[i] = pic->non_intra_matrix[zscan[i]];
	}

	result.profile_and_level_indication = 0;
	result.chroma_format = 0x1;

	result.picture_coding_type = pic->picture_coding_type;
	result.f_code[0][0] = pic->f_code[0][0] + 1;
	result.f_code[0][1] = pic->f_code[0][1] + 1;
	result.f_code[1][0] = pic->f_code[1][0] + 1;
	result.f_code[1][1] = pic->f_code[1][1] + 1;
	result.intra_dc_precision = pic->intra_dc_precision;
	result.pic_structure = pic->picture_structure;
	result.top_field_first = pic->top_field_first;
	result.frame_pred_frame_dct = pic->frame_pred_frame_dct;
	result.concealment_motion_vectors = pic->concealment_motion_vectors;
	result.q_scale_type = pic->q_scale_type;
	result.intra_vlc_format = pic->intra_vlc_format;
	result.alternate_scan = pic->alternate_scan;

	return result;
}

static void get_mjpeg_slice_header(struct ruvd_decoder *dec, struct pipe_mjpeg_picture_desc *pic)
{
	int size = 0, saved_size, len_pos, i;
	uint16_t *bs;
	uint8_t *buf = dec->bs_ptr;

	/* SOI */
	buf[size++] = 0xff;
	buf[size++] = 0xd8;

	/* DQT */
	buf[size++] = 0xff;
	buf[size++] = 0xdb;

	len_pos = size++;
	size++;

	for (i = 0; i < 4; ++i) {
		if (pic->quantization_table.load_quantiser_table[i] == 0)
			continue;

		buf[size++] = i;
		memcpy((buf + size), &pic->quantization_table.quantiser_table[i], 64);
		size += 64;
	}

	bs = (uint16_t*)&buf[len_pos];
	*bs = util_bswap16(size - 4);

	saved_size = size;

	/* DHT */
	buf[size++] = 0xff;
	buf[size++] = 0xc4;

	len_pos = size++;
	size++;

	for (i = 0; i < 2; ++i) {
		if (pic->huffman_table.load_huffman_table[i] == 0)
			continue;

		buf[size++] = 0x00 | i;
		memcpy((buf + size), &pic->huffman_table.table[i].num_dc_codes, 16);
		size += 16;
		memcpy((buf + size), &pic->huffman_table.table[i].dc_values, 12);
		size += 12;
	}

	for (i = 0; i < 2; ++i) {
		if (pic->huffman_table.load_huffman_table[i] == 0)
			continue;

		buf[size++] = 0x10 | i;
		memcpy((buf + size), &pic->huffman_table.table[i].num_ac_codes, 16);
		size += 16;
		memcpy((buf + size), &pic->huffman_table.table[i].ac_values, 162);
		size += 162;
	}

	bs = (uint16_t*)&buf[len_pos];
	*bs = util_bswap16(size - saved_size - 2);

	saved_size = size;

	/* DRI */
	if (pic->slice_parameter.restart_interval) {
		buf[size++] = 0xff;
		buf[size++] = 0xdd;
		buf[size++] = 0x00;
		buf[size++] = 0x04;
		bs = (uint16_t*)&buf[size++];
		*bs = util_bswap16(pic->slice_parameter.restart_interval);
		saved_size = ++size;
	}

	/* SOF */
	buf[size++] = 0xff;
	buf[size++] = 0xc0;

	len_pos = size++;
	size++;

	buf[size++] = 0x08;

	bs = (uint16_t*)&buf[size++];
	*bs = util_bswap16(pic->picture_parameter.picture_height);
	size++;

	bs = (uint16_t*)&buf[size++];
	*bs = util_bswap16(pic->picture_parameter.picture_width);
	size++;

	buf[size++] = pic->picture_parameter.num_components;

	for (i = 0; i < pic->picture_parameter.num_components; ++i) {
		buf[size++] = pic->picture_parameter.components[i].component_id;
		buf[size++] = pic->picture_parameter.components[i].h_sampling_factor << 4 |
			pic->picture_parameter.components[i].v_sampling_factor;
		buf[size++] = pic->picture_parameter.components[i].quantiser_table_selector;
	}

	bs = (uint16_t*)&buf[len_pos];
	*bs = util_bswap16(size - saved_size - 2);

	saved_size = size;

	/* SOS */
	buf[size++] = 0xff;
	buf[size++] = 0xda;

	len_pos = size++;
	size++;

	buf[size++] = pic->slice_parameter.num_components;

	for (i = 0; i < pic->slice_parameter.num_components; ++i) {
		buf[size++] = pic->slice_parameter.components[i].component_selector;
		buf[size++] = pic->slice_parameter.components[i].dc_table_selector << 4 |
			pic->slice_parameter.components[i].ac_table_selector;
	}

	buf[size++] = 0x00;
	buf[size++] = 0x3f;
	buf[size++] = 0x00;

	bs = (uint16_t*)&buf[len_pos];
	*bs = util_bswap16(size - saved_size - 2);

	dec->bs_ptr += size;
	dec->bs_size += size;
}

/**
 * destroy this video decoder
 */
static void ruvd_destroy(struct pipe_video_codec *decoder)
{
	struct ruvd_decoder *dec = (struct ruvd_decoder*)decoder;
	unsigned i;

	assert(decoder);

	map_msg_fb_it_buf(dec);
	dec->msg->size = sizeof(*dec->msg);
	dec->msg->msg_type = RUVD_MSG_DESTROY;
	dec->msg->stream_handle = dec->stream_handle;
	send_msg_buf(dec);

	flush(dec, 0, NULL);

	dec->ws->cs_destroy(&dec->cs);

	for (i = 0; i < NUM_BUFFERS; ++i) {
		rvid_destroy_buffer(&dec->msg_fb_it_buffers[i]);
		rvid_destroy_buffer(&dec->bs_buffers[i]);
	}

	rvid_destroy_buffer(&dec->dpb);
	rvid_destroy_buffer(&dec->ctx);
	rvid_destroy_buffer(&dec->sessionctx);

	FREE(dec);
}

/**
 * start decoding of a new frame
 */
static void ruvd_begin_frame(struct pipe_video_codec *decoder,
			     struct pipe_video_buffer *target,
			     struct pipe_picture_desc *picture)
{
	struct ruvd_decoder *dec = (struct ruvd_decoder*)decoder;
	uintptr_t frame;

	assert(decoder);

	frame = ++dec->frame_number;
	vl_video_buffer_set_associated_data(target, decoder, (void *)frame,
					    &ruvd_destroy_associated_data);

	dec->bs_size = 0;
	dec->bs_ptr = dec->ws->buffer_map(dec->ws,
		dec->bs_buffers[dec->cur_buffer].res->buf,
		&dec->cs, PIPE_MAP_WRITE | RADEON_MAP_TEMPORARY);
}

/**
 * decode a macroblock
 */
static void ruvd_decode_macroblock(struct pipe_video_codec *decoder,
				   struct pipe_video_buffer *target,
				   struct pipe_picture_desc *picture,
				   const struct pipe_macroblock *macroblocks,
				   unsigned num_macroblocks)
{
	/* not supported (yet) */
	assert(0);
}

/**
 * decode a bitstream
 */
static void ruvd_decode_bitstream(struct pipe_video_codec *decoder,
				  struct pipe_video_buffer *target,
				  struct pipe_picture_desc *picture,
				  unsigned num_buffers,
				  const void * const *buffers,
				  const unsigned *sizes)
{
	struct ruvd_decoder *dec = (struct ruvd_decoder*)decoder;
	enum pipe_video_format format = u_reduce_video_profile(picture->profile);
	unsigned i;

	assert(decoder);

	if (!dec->bs_ptr)
		return;

	if (format == PIPE_VIDEO_FORMAT_JPEG)
		get_mjpeg_slice_header(dec, (struct pipe_mjpeg_picture_desc*)picture);

	for (i = 0; i < num_buffers; ++i) {
		struct rvid_buffer *buf = &dec->bs_buffers[dec->cur_buffer];
		unsigned new_size = dec->bs_size + sizes[i];

		if (format == PIPE_VIDEO_FORMAT_JPEG)
			new_size += 2; /* save for EOI */

		if (new_size > buf->res->buf->size) {
			dec->ws->buffer_unmap(dec->ws, buf->res->buf);
			dec->bs_ptr = NULL;
			if (!rvid_resize_buffer(dec->screen, &dec->cs, buf, new_size)) {
				RVID_ERR("Can't resize bitstream buffer!");
				return;
			}

			dec->bs_ptr = dec->ws->buffer_map(dec->ws, buf->res->buf, &dec->cs,
							  PIPE_MAP_WRITE |
							  RADEON_MAP_TEMPORARY);
			if (!dec->bs_ptr)
				return;

			dec->bs_ptr += dec->bs_size;
		}

		memcpy(dec->bs_ptr, buffers[i], sizes[i]);
		dec->bs_size += sizes[i];
		dec->bs_ptr += sizes[i];
	}

	if (format == PIPE_VIDEO_FORMAT_JPEG) {
		((uint8_t *)dec->bs_ptr)[0] = 0xff;	/* EOI */
		((uint8_t *)dec->bs_ptr)[1] = 0xd9;
		dec->bs_size += 2;
		dec->bs_ptr += 2;
	}
}

/**
 * end decoding of the current frame
 */
static int ruvd_end_frame(struct pipe_video_codec *decoder,
			   struct pipe_video_buffer *target,
			   struct pipe_picture_desc *picture)
{
	struct ruvd_decoder *dec = (struct ruvd_decoder*)decoder;
	struct pb_buffer_lean *dt;
	struct rvid_buffer *msg_fb_it_buf, *bs_buf;
	unsigned bs_size;

	assert(decoder);

	if (!dec->bs_ptr)
		return 1;

	msg_fb_it_buf = &dec->msg_fb_it_buffers[dec->cur_buffer];
	bs_buf = &dec->bs_buffers[dec->cur_buffer];

	bs_size = align(dec->bs_size, 128);
	memset(dec->bs_ptr, 0, bs_size - dec->bs_size);
	dec->ws->buffer_unmap(dec->ws, bs_buf->res->buf);
	dec->bs_ptr = NULL;

	map_msg_fb_it_buf(dec);
	dec->msg->size = sizeof(*dec->msg);
	dec->msg->msg_type = RUVD_MSG_DECODE;
	dec->msg->stream_handle = dec->stream_handle;
	dec->msg->status_report_feedback_number = dec->frame_number;

	dec->msg->body.decode.stream_type = dec->stream_type;
	dec->msg->body.decode.decode_flags = 0x1;
	dec->msg->body.decode.width_in_samples = dec->base.width;
	dec->msg->body.decode.height_in_samples = dec->base.height;

	if ((picture->profile == PIPE_VIDEO_PROFILE_VC1_SIMPLE) ||
	    (picture->profile == PIPE_VIDEO_PROFILE_VC1_MAIN)) {
		dec->msg->body.decode.width_in_samples = align(dec->msg->body.decode.width_in_samples, 16) / 16;
		dec->msg->body.decode.height_in_samples = align(dec->msg->body.decode.height_in_samples, 16) / 16;
	}

	if (dec->dpb.res)
		dec->msg->body.decode.dpb_size = dec->dpb.res->buf->size;
	dec->msg->body.decode.bsd_size = bs_size;
	dec->msg->body.decode.db_pitch = align(dec->base.width, get_db_pitch_alignment(dec));

	dt = dec->set_dtb(dec->msg, (struct vl_video_buffer *)target);

	switch (u_reduce_video_profile(picture->profile)) {
	case PIPE_VIDEO_FORMAT_MPEG4_AVC:
		dec->msg->body.decode.codec.h264 = get_h264_msg(dec, (struct pipe_h264_picture_desc*)picture);
		break;

	case PIPE_VIDEO_FORMAT_VC1:
		dec->msg->body.decode.codec.vc1 = get_vc1_msg((struct pipe_vc1_picture_desc*)picture);
		break;

	case PIPE_VIDEO_FORMAT_MPEG12:
		dec->msg->body.decode.codec.mpeg2 = get_mpeg2_msg(dec, (struct pipe_mpeg12_picture_desc*)picture);
		break;

	case PIPE_VIDEO_FORMAT_JPEG:
		break;

	default:
		assert(0);
		return 1;
	}

	dec->msg->body.decode.db_surf_tile_config = dec->msg->body.decode.dt_surf_tile_config;
	dec->msg->body.decode.extension_support = 0x1;

	/* set at least the feedback buffer size */
	dec->fb[0] = dec->fb_size;

	send_msg_buf(dec);

	if (dec->dpb.res)
		send_cmd(dec, RUVD_CMD_DPB_BUFFER, dec->dpb.res->buf, 0,
			RADEON_USAGE_READWRITE, RADEON_DOMAIN_VRAM);

	if (dec->ctx.res)
		send_cmd(dec, RUVD_CMD_CONTEXT_BUFFER, dec->ctx.res->buf, 0,
			RADEON_USAGE_READWRITE, RADEON_DOMAIN_VRAM);
	send_cmd(dec, RUVD_CMD_BITSTREAM_BUFFER, bs_buf->res->buf,
		 0, RADEON_USAGE_READ, RADEON_DOMAIN_GTT);
	send_cmd(dec, RUVD_CMD_DECODING_TARGET_BUFFER, dt, 0,
		 RADEON_USAGE_WRITE, RADEON_DOMAIN_VRAM);
	send_cmd(dec, RUVD_CMD_FEEDBACK_BUFFER, msg_fb_it_buf->res->buf,
		 FB_BUFFER_OFFSET, RADEON_USAGE_WRITE, RADEON_DOMAIN_GTT);
	if (have_it(dec))
		send_cmd(dec, RUVD_CMD_ITSCALING_TABLE_BUFFER, msg_fb_it_buf->res->buf,
			 FB_BUFFER_OFFSET + dec->fb_size, RADEON_USAGE_READ, RADEON_DOMAIN_GTT);
	set_reg(dec, dec->reg.cntl, 1);

	flush(dec, PIPE_FLUSH_ASYNC, picture->out_fence);
	next_buffer(dec);
	return 0;
}

/**
 * flush any outstanding command buffers to the hardware
 */
static void ruvd_flush(struct pipe_video_codec *decoder)
{
}

static int ruvd_fence_wait(struct pipe_video_codec *decoder,
                           struct pipe_fence_handle *fence,
                           uint64_t timeout) {

  struct ruvd_decoder *dec = (struct ruvd_decoder *)decoder;
  return dec->ws->fence_wait(dec->ws, fence, timeout);
}

/**
 * create and UVD decoder
 */
struct pipe_video_codec *ruvd_create_decoder(struct pipe_context *context,
					     const struct pipe_video_codec *templ,
					     ruvd_set_dtb set_dtb)
{
	struct radeon_winsys* ws = ((struct r600_common_context *)context)->ws;
	struct r600_common_context *rctx = (struct r600_common_context*)context;
	unsigned dpb_size;
	unsigned width = templ->width, height = templ->height;
	unsigned bs_buf_size;
	struct radeon_info info;
	struct ruvd_decoder *dec;
	int r, i;

	ws->query_info(ws, &info);

	switch(u_reduce_video_profile(templ->profile)) {
	case PIPE_VIDEO_FORMAT_MPEG12:
		width = align(width, VL_MACROBLOCK_WIDTH);
		height = align(height, VL_MACROBLOCK_HEIGHT);
		break;
	case PIPE_VIDEO_FORMAT_MPEG4_AVC:
		width = align(width, VL_MACROBLOCK_WIDTH);
		height = align(height, VL_MACROBLOCK_HEIGHT);
		break;

	default:
		break;
	}


	dec = CALLOC_STRUCT(ruvd_decoder);

	if (!dec)
		return NULL;

	dec->use_legacy = true;

	dec->base = *templ;
	dec->base.context = context;
	dec->base.width = width;
	dec->base.height = height;

	dec->base.destroy = ruvd_destroy;
	dec->base.begin_frame = ruvd_begin_frame;
	dec->base.decode_macroblock = ruvd_decode_macroblock;
	dec->base.decode_bitstream = ruvd_decode_bitstream;
	dec->base.end_frame = ruvd_end_frame;
	dec->base.flush = ruvd_flush;
	dec->base.fence_wait = ruvd_fence_wait;

	dec->stream_type = profile2stream_type(dec, info.family);
	dec->set_dtb = set_dtb;
	dec->stream_handle = rvid_alloc_stream_handle();
	dec->screen = context->screen;
	dec->ws = ws;

	if (!ws->cs_create(&dec->cs, rctx->ctx, AMD_IP_UVD, NULL, NULL)) {
		RVID_ERR("Can't get command submission context.\n");
		goto error;
	}

	dec->fb_size = FB_BUFFER_SIZE;
	bs_buf_size = width * height * (512 / (16 * 16));
	for (i = 0; i < NUM_BUFFERS; ++i) {
		unsigned msg_fb_it_size = FB_BUFFER_OFFSET + dec->fb_size;
		STATIC_ASSERT(sizeof(struct ruvd_msg) <= FB_BUFFER_OFFSET);
		if (have_it(dec))
			msg_fb_it_size += IT_SCALING_TABLE_SIZE;
		if (!rvid_create_buffer(dec->screen, &dec->msg_fb_it_buffers[i],
					msg_fb_it_size, PIPE_USAGE_STAGING)) {
			RVID_ERR("Can't allocated message buffers.\n");
			goto error;
		}

		if (!rvid_create_buffer(dec->screen, &dec->bs_buffers[i],
					bs_buf_size, PIPE_USAGE_STAGING)) {
			RVID_ERR("Can't allocated bitstream buffers.\n");
			goto error;
		}

		rvid_clear_buffer(context, &dec->msg_fb_it_buffers[i]);
		rvid_clear_buffer(context, &dec->bs_buffers[i]);
	}

	dpb_size = calc_dpb_size(dec);
	if (dpb_size) {
		if (!rvid_create_buffer(dec->screen, &dec->dpb, dpb_size, PIPE_USAGE_DEFAULT)) {
			RVID_ERR("Can't allocated dpb.\n");
			goto error;
		}
		rvid_clear_buffer(context, &dec->dpb);
	}

	dec->reg.data0 = RUVD_GPCOM_VCPU_DATA0;
	dec->reg.data1 = RUVD_GPCOM_VCPU_DATA1;
	dec->reg.cmd = RUVD_GPCOM_VCPU_CMD;
	dec->reg.cntl = RUVD_ENGINE_CNTL;

	map_msg_fb_it_buf(dec);
	dec->msg->size = sizeof(*dec->msg);
	dec->msg->msg_type = RUVD_MSG_CREATE;
	dec->msg->stream_handle = dec->stream_handle;
	dec->msg->body.create.stream_type = dec->stream_type;
	dec->msg->body.create.width_in_samples = dec->base.width;
	dec->msg->body.create.height_in_samples = dec->base.height;
	dec->msg->body.create.dpb_size = dpb_size;
	send_msg_buf(dec);
	r = flush(dec, 0, NULL);
	if (r)
		goto error;

	next_buffer(dec);

	return &dec->base;

error:
	dec->ws->cs_destroy(&dec->cs);

	for (i = 0; i < NUM_BUFFERS; ++i) {
		rvid_destroy_buffer(&dec->msg_fb_it_buffers[i]);
		rvid_destroy_buffer(&dec->bs_buffers[i]);
	}

	rvid_destroy_buffer(&dec->dpb);
	rvid_destroy_buffer(&dec->ctx);
	rvid_destroy_buffer(&dec->sessionctx);

	FREE(dec);

	return NULL;
}

/* calculate top/bottom offset */
static unsigned texture_offset(struct radeon_surf *surface, unsigned layer)
{
	return (uint64_t)surface->u.legacy.level[0].offset_256B * 256 +
		layer * (uint64_t)surface->u.legacy.level[0].slice_size_dw * 4;
}

/* hw encode the aspect of macro tiles */
static unsigned macro_tile_aspect(unsigned macro_tile_aspect)
{
	switch (macro_tile_aspect) {
	default:
	case 1: macro_tile_aspect = 0;  break;
	case 2: macro_tile_aspect = 1;  break;
	case 4: macro_tile_aspect = 2;  break;
	case 8: macro_tile_aspect = 3;  break;
	}
	return macro_tile_aspect;
}

/* hw encode the bank width and height */
static unsigned bank_wh(unsigned bankwh)
{
	switch (bankwh) {
	default:
	case 1: bankwh = 0;     break;
	case 2: bankwh = 1;     break;
	case 4: bankwh = 2;     break;
	case 8: bankwh = 3;     break;
	}
	return bankwh;
}

/**
 * fill decoding target field from the luma and chroma surfaces
 */
void ruvd_set_dt_surfaces(struct ruvd_msg *msg, struct radeon_surf *luma,
			  struct radeon_surf *chroma)
{
	msg->body.decode.dt_pitch = luma->u.legacy.level[0].nblk_x * luma->blk_w;
	switch (luma->u.legacy.level[0].mode) {
	case RADEON_SURF_MODE_LINEAR_ALIGNED:
		msg->body.decode.dt_tiling_mode = RUVD_TILE_LINEAR;
		msg->body.decode.dt_array_mode = RUVD_ARRAY_MODE_LINEAR;
		break;
	case RADEON_SURF_MODE_1D:
		msg->body.decode.dt_tiling_mode = RUVD_TILE_8X8;
		msg->body.decode.dt_array_mode = RUVD_ARRAY_MODE_1D_THIN;
		break;
	case RADEON_SURF_MODE_2D:
		msg->body.decode.dt_tiling_mode = RUVD_TILE_8X8;
		msg->body.decode.dt_array_mode = RUVD_ARRAY_MODE_2D_THIN;
		break;
	default:
		assert(0);
		break;
	}

	msg->body.decode.dt_luma_top_offset = texture_offset(luma, 0);
	if (chroma)
		msg->body.decode.dt_chroma_top_offset = texture_offset(chroma, 0);
	if (msg->body.decode.dt_field_mode) {
		msg->body.decode.dt_luma_bottom_offset = texture_offset(luma, 1);
		if (chroma)
			msg->body.decode.dt_chroma_bottom_offset = texture_offset(chroma, 1);
	} else {
		msg->body.decode.dt_luma_bottom_offset = msg->body.decode.dt_luma_top_offset;
		msg->body.decode.dt_chroma_bottom_offset = msg->body.decode.dt_chroma_top_offset;
	}

	if (chroma) {
		assert(luma->u.legacy.bankw == chroma->u.legacy.bankw);
		assert(luma->u.legacy.bankh == chroma->u.legacy.bankh);
		assert(luma->u.legacy.mtilea == chroma->u.legacy.mtilea);
	}

	msg->body.decode.dt_surf_tile_config |= RUVD_BANK_WIDTH(bank_wh(luma->u.legacy.bankw));
	msg->body.decode.dt_surf_tile_config |= RUVD_BANK_HEIGHT(bank_wh(luma->u.legacy.bankh));
	msg->body.decode.dt_surf_tile_config |= RUVD_MACRO_TILE_ASPECT_RATIO(macro_tile_aspect(luma->u.legacy.mtilea));
}
