403 lines
17 KiB
C
Executable File
403 lines
17 KiB
C
Executable File
/*
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* H.264 HW decode acceleration through VA API
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*
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* Copyright (C) 2008-2009 Splitted-Desktop Systems
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "h264dec.h"
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#include "h264_ps.h"
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#include "hwconfig.h"
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#include "vaapi_decode.h"
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/**
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* @file
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* This file implements the glue code between FFmpeg's and VA API's
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* structures for H.264 decoding.
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*/
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/**
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* Initialize an empty VA API picture.
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*
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* VA API requires a fixed-size reference picture array.
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*/
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static void init_vaapi_pic(VAPictureH264 *va_pic)
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{
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va_pic->picture_id = VA_INVALID_ID;
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va_pic->flags = VA_PICTURE_H264_INVALID;
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va_pic->TopFieldOrderCnt = 0;
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va_pic->BottomFieldOrderCnt = 0;
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}
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/**
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* Translate an FFmpeg Picture into its VA API form.
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*
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* @param[out] va_pic A pointer to VA API's own picture struct
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* @param[in] pic A pointer to the FFmpeg picture struct to convert
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* @param[in] pic_structure The picture field type (as defined in mpegvideo.h),
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* supersedes pic's field type if nonzero.
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*/
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static void fill_vaapi_pic(VAPictureH264 *va_pic,
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const H264Picture *pic,
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int pic_structure)
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{
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if (pic_structure == 0)
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pic_structure = pic->reference;
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pic_structure &= PICT_FRAME; /* PICT_TOP_FIELD|PICT_BOTTOM_FIELD */
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va_pic->picture_id = ff_vaapi_get_surface_id(pic->f);
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va_pic->frame_idx = pic->long_ref ? pic->pic_id : pic->frame_num;
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va_pic->flags = 0;
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if (pic_structure != PICT_FRAME)
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va_pic->flags |= (pic_structure & PICT_TOP_FIELD) ? VA_PICTURE_H264_TOP_FIELD : VA_PICTURE_H264_BOTTOM_FIELD;
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if (pic->reference)
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va_pic->flags |= pic->long_ref ? VA_PICTURE_H264_LONG_TERM_REFERENCE : VA_PICTURE_H264_SHORT_TERM_REFERENCE;
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va_pic->TopFieldOrderCnt = 0;
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if (pic->field_poc[0] != INT_MAX)
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va_pic->TopFieldOrderCnt = pic->field_poc[0];
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va_pic->BottomFieldOrderCnt = 0;
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if (pic->field_poc[1] != INT_MAX)
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va_pic->BottomFieldOrderCnt = pic->field_poc[1];
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}
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/** Decoded Picture Buffer (DPB). */
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typedef struct DPB {
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int size; ///< Current number of reference frames in the DPB
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int max_size; ///< Max number of reference frames. This is FF_ARRAY_ELEMS(VAPictureParameterBufferH264.ReferenceFrames)
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VAPictureH264 *va_pics; ///< Pointer to VAPictureParameterBufferH264.ReferenceFrames array
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} DPB;
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/**
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* Append picture to the decoded picture buffer, in a VA API form that
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* merges the second field picture attributes with the first, if
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* available. The decoded picture buffer's size must be large enough
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* to receive the new VA API picture object.
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*/
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static int dpb_add(DPB *dpb, const H264Picture *pic)
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{
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int i;
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if (dpb->size >= dpb->max_size)
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return -1;
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for (i = 0; i < dpb->size; i++) {
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VAPictureH264 * const va_pic = &dpb->va_pics[i];
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if (va_pic->picture_id == ff_vaapi_get_surface_id(pic->f)) {
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VAPictureH264 temp_va_pic;
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fill_vaapi_pic(&temp_va_pic, pic, 0);
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if ((temp_va_pic.flags ^ va_pic->flags) & (VA_PICTURE_H264_TOP_FIELD | VA_PICTURE_H264_BOTTOM_FIELD)) {
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va_pic->flags |= temp_va_pic.flags & (VA_PICTURE_H264_TOP_FIELD | VA_PICTURE_H264_BOTTOM_FIELD);
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/* Merge second field */
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if (temp_va_pic.flags & VA_PICTURE_H264_TOP_FIELD) {
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va_pic->TopFieldOrderCnt = temp_va_pic.TopFieldOrderCnt;
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} else {
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va_pic->BottomFieldOrderCnt = temp_va_pic.BottomFieldOrderCnt;
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}
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}
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return 0;
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}
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}
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fill_vaapi_pic(&dpb->va_pics[dpb->size++], pic, 0);
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return 0;
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}
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/** Fill in VA API reference frames array. */
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static int fill_vaapi_ReferenceFrames(VAPictureParameterBufferH264 *pic_param,
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const H264Context *h)
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{
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DPB dpb;
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int i;
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dpb.size = 0;
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dpb.max_size = FF_ARRAY_ELEMS(pic_param->ReferenceFrames);
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dpb.va_pics = pic_param->ReferenceFrames;
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for (i = 0; i < dpb.max_size; i++)
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init_vaapi_pic(&dpb.va_pics[i]);
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for (i = 0; i < h->short_ref_count; i++) {
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const H264Picture *pic = h->short_ref[i];
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if (pic && pic->reference && dpb_add(&dpb, pic) < 0)
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return -1;
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}
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for (i = 0; i < 16; i++) {
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const H264Picture *pic = h->long_ref[i];
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if (pic && pic->reference && dpb_add(&dpb, pic) < 0)
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return -1;
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}
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return 0;
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}
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/**
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* Fill in VA API reference picture lists from the FFmpeg reference
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* picture list.
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*
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* @param[out] RefPicList VA API internal reference picture list
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* @param[in] ref_list A pointer to the FFmpeg reference list
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* @param[in] ref_count The number of reference pictures in ref_list
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*/
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static void fill_vaapi_RefPicList(VAPictureH264 RefPicList[32],
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const H264Ref *ref_list,
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unsigned int ref_count)
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{
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unsigned int i, n = 0;
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for (i = 0; i < ref_count; i++)
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if (ref_list[i].reference)
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fill_vaapi_pic(&RefPicList[n++], ref_list[i].parent,
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ref_list[i].reference);
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for (; n < 32; n++)
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init_vaapi_pic(&RefPicList[n]);
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}
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/**
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* Fill in prediction weight table.
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*
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* VA API requires a plain prediction weight table as it does not infer
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* any value.
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*
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* @param[in] h A pointer to the current H.264 context
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* @param[in] list The reference frame list index to use
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* @param[out] luma_weight_flag VA API plain luma weight flag
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* @param[out] luma_weight VA API plain luma weight table
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* @param[out] luma_offset VA API plain luma offset table
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* @param[out] chroma_weight_flag VA API plain chroma weight flag
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* @param[out] chroma_weight VA API plain chroma weight table
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* @param[out] chroma_offset VA API plain chroma offset table
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*/
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static void fill_vaapi_plain_pred_weight_table(const H264Context *h,
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int list,
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unsigned char *luma_weight_flag,
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short luma_weight[32],
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short luma_offset[32],
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unsigned char *chroma_weight_flag,
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short chroma_weight[32][2],
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short chroma_offset[32][2])
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{
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const H264SliceContext *sl = &h->slice_ctx[0];
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unsigned int i, j;
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*luma_weight_flag = sl->pwt.luma_weight_flag[list];
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*chroma_weight_flag = sl->pwt.chroma_weight_flag[list];
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for (i = 0; i < sl->ref_count[list]; i++) {
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/* VA API also wants the inferred (default) values, not
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only what is available in the bitstream (7.4.3.2). */
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if (sl->pwt.luma_weight_flag[list]) {
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luma_weight[i] = sl->pwt.luma_weight[i][list][0];
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luma_offset[i] = sl->pwt.luma_weight[i][list][1];
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} else {
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luma_weight[i] = 1 << sl->pwt.luma_log2_weight_denom;
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luma_offset[i] = 0;
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}
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for (j = 0; j < 2; j++) {
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if (sl->pwt.chroma_weight_flag[list]) {
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chroma_weight[i][j] = sl->pwt.chroma_weight[i][list][j][0];
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chroma_offset[i][j] = sl->pwt.chroma_weight[i][list][j][1];
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} else {
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chroma_weight[i][j] = 1 << sl->pwt.chroma_log2_weight_denom;
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chroma_offset[i][j] = 0;
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}
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}
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}
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}
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/** Initialize and start decoding a frame with VA API. */
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static int vaapi_h264_start_frame(AVCodecContext *avctx,
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av_unused const uint8_t *buffer,
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av_unused uint32_t size)
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{
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const H264Context *h = avctx->priv_data;
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VAAPIDecodePicture *pic = h->cur_pic_ptr->hwaccel_picture_private;
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const PPS *pps = h->ps.pps;
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const SPS *sps = h->ps.sps;
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VAPictureParameterBufferH264 pic_param;
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VAIQMatrixBufferH264 iq_matrix;
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int err;
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pic->output_surface = ff_vaapi_get_surface_id(h->cur_pic_ptr->f);
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pic_param = (VAPictureParameterBufferH264) {
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.picture_width_in_mbs_minus1 = h->mb_width - 1,
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.picture_height_in_mbs_minus1 = h->mb_height - 1,
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.bit_depth_luma_minus8 = sps->bit_depth_luma - 8,
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.bit_depth_chroma_minus8 = sps->bit_depth_chroma - 8,
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.num_ref_frames = sps->ref_frame_count,
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.seq_fields.bits = {
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.chroma_format_idc = sps->chroma_format_idc,
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.residual_colour_transform_flag = sps->residual_color_transform_flag,
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.gaps_in_frame_num_value_allowed_flag = sps->gaps_in_frame_num_allowed_flag,
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.frame_mbs_only_flag = sps->frame_mbs_only_flag,
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.mb_adaptive_frame_field_flag = sps->mb_aff,
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.direct_8x8_inference_flag = sps->direct_8x8_inference_flag,
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.MinLumaBiPredSize8x8 = sps->level_idc >= 31, /* A.3.3.2 */
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.log2_max_frame_num_minus4 = sps->log2_max_frame_num - 4,
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.pic_order_cnt_type = sps->poc_type,
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.log2_max_pic_order_cnt_lsb_minus4 = sps->log2_max_poc_lsb - 4,
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.delta_pic_order_always_zero_flag = sps->delta_pic_order_always_zero_flag,
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},
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.pic_init_qp_minus26 = pps->init_qp - 26,
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.pic_init_qs_minus26 = pps->init_qs - 26,
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.chroma_qp_index_offset = pps->chroma_qp_index_offset[0],
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.second_chroma_qp_index_offset = pps->chroma_qp_index_offset[1],
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.pic_fields.bits = {
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.entropy_coding_mode_flag = pps->cabac,
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.weighted_pred_flag = pps->weighted_pred,
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.weighted_bipred_idc = pps->weighted_bipred_idc,
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.transform_8x8_mode_flag = pps->transform_8x8_mode,
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.field_pic_flag = h->picture_structure != PICT_FRAME,
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.constrained_intra_pred_flag = pps->constrained_intra_pred,
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.pic_order_present_flag = pps->pic_order_present,
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.deblocking_filter_control_present_flag = pps->deblocking_filter_parameters_present,
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.redundant_pic_cnt_present_flag = pps->redundant_pic_cnt_present,
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.reference_pic_flag = h->nal_ref_idc != 0,
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},
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.frame_num = h->poc.frame_num,
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};
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fill_vaapi_pic(&pic_param.CurrPic, h->cur_pic_ptr, h->picture_structure);
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err = fill_vaapi_ReferenceFrames(&pic_param, h);
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if (err < 0)
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goto fail;
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err = ff_vaapi_decode_make_param_buffer(avctx, pic,
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VAPictureParameterBufferType,
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&pic_param, sizeof(pic_param));
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if (err < 0)
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goto fail;
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memcpy(iq_matrix.ScalingList4x4,
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pps->scaling_matrix4, sizeof(iq_matrix.ScalingList4x4));
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memcpy(iq_matrix.ScalingList8x8[0],
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pps->scaling_matrix8[0], sizeof(iq_matrix.ScalingList8x8[0]));
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memcpy(iq_matrix.ScalingList8x8[1],
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pps->scaling_matrix8[3], sizeof(iq_matrix.ScalingList8x8[0]));
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err = ff_vaapi_decode_make_param_buffer(avctx, pic,
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VAIQMatrixBufferType,
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&iq_matrix, sizeof(iq_matrix));
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if (err < 0)
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goto fail;
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return 0;
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fail:
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ff_vaapi_decode_cancel(avctx, pic);
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return err;
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}
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/** End a hardware decoding based frame. */
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static int vaapi_h264_end_frame(AVCodecContext *avctx)
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{
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const H264Context *h = avctx->priv_data;
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VAAPIDecodePicture *pic = h->cur_pic_ptr->hwaccel_picture_private;
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H264SliceContext *sl = &h->slice_ctx[0];
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int ret;
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ret = ff_vaapi_decode_issue(avctx, pic);
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if (ret < 0)
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goto finish;
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ff_h264_draw_horiz_band(h, sl, 0, h->avctx->height);
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finish:
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return ret;
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}
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/** Decode the given H.264 slice with VA API. */
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static int vaapi_h264_decode_slice(AVCodecContext *avctx,
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const uint8_t *buffer,
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uint32_t size)
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{
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const H264Context *h = avctx->priv_data;
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VAAPIDecodePicture *pic = h->cur_pic_ptr->hwaccel_picture_private;
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const H264SliceContext *sl = &h->slice_ctx[0];
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VASliceParameterBufferH264 slice_param;
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int err;
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slice_param = (VASliceParameterBufferH264) {
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.slice_data_size = size,
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.slice_data_offset = 0,
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.slice_data_flag = VA_SLICE_DATA_FLAG_ALL,
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.slice_data_bit_offset = get_bits_count(&sl->gb),
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.first_mb_in_slice = (sl->mb_y >> FIELD_OR_MBAFF_PICTURE(h)) * h->mb_width + sl->mb_x,
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.slice_type = ff_h264_get_slice_type(sl),
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.direct_spatial_mv_pred_flag = sl->slice_type == AV_PICTURE_TYPE_B ? sl->direct_spatial_mv_pred : 0,
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.num_ref_idx_l0_active_minus1 = sl->list_count > 0 ? sl->ref_count[0] - 1 : 0,
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.num_ref_idx_l1_active_minus1 = sl->list_count > 1 ? sl->ref_count[1] - 1 : 0,
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.cabac_init_idc = sl->cabac_init_idc,
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.slice_qp_delta = sl->qscale - h->ps.pps->init_qp,
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.disable_deblocking_filter_idc = sl->deblocking_filter < 2 ? !sl->deblocking_filter : sl->deblocking_filter,
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.slice_alpha_c0_offset_div2 = sl->slice_alpha_c0_offset / 2,
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.slice_beta_offset_div2 = sl->slice_beta_offset / 2,
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.luma_log2_weight_denom = sl->pwt.luma_log2_weight_denom,
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.chroma_log2_weight_denom = sl->pwt.chroma_log2_weight_denom,
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};
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fill_vaapi_RefPicList(slice_param.RefPicList0, sl->ref_list[0],
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sl->list_count > 0 ? sl->ref_count[0] : 0);
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fill_vaapi_RefPicList(slice_param.RefPicList1, sl->ref_list[1],
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sl->list_count > 1 ? sl->ref_count[1] : 0);
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fill_vaapi_plain_pred_weight_table(h, 0,
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&slice_param.luma_weight_l0_flag,
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slice_param.luma_weight_l0,
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slice_param.luma_offset_l0,
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&slice_param.chroma_weight_l0_flag,
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slice_param.chroma_weight_l0,
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slice_param.chroma_offset_l0);
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fill_vaapi_plain_pred_weight_table(h, 1,
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&slice_param.luma_weight_l1_flag,
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slice_param.luma_weight_l1,
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slice_param.luma_offset_l1,
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&slice_param.chroma_weight_l1_flag,
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slice_param.chroma_weight_l1,
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slice_param.chroma_offset_l1);
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err = ff_vaapi_decode_make_slice_buffer(avctx, pic,
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&slice_param, sizeof(slice_param),
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buffer, size);
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if (err) {
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ff_vaapi_decode_cancel(avctx, pic);
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return err;
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}
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return 0;
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}
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const AVHWAccel ff_h264_vaapi_hwaccel = {
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.name = "h264_vaapi",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_H264,
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.pix_fmt = AV_PIX_FMT_VAAPI,
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.start_frame = &vaapi_h264_start_frame,
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.end_frame = &vaapi_h264_end_frame,
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.decode_slice = &vaapi_h264_decode_slice,
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.frame_priv_data_size = sizeof(VAAPIDecodePicture),
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.init = &ff_vaapi_decode_init,
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.uninit = &ff_vaapi_decode_uninit,
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.frame_params = &ff_vaapi_common_frame_params,
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.priv_data_size = sizeof(VAAPIDecodeContext),
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.caps_internal = HWACCEL_CAP_ASYNC_SAFE,
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};
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