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ffmpeg / libavcodec / vaapi_h264.c @ 2d2b5a14

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/*
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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 "vaapi_internal.h"
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#include "h264.h"
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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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                           Picture       *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);
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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, Picture *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)) {
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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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                                      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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        Picture * const 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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        Picture * const 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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                                  Picture      *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], 0);
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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(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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    unsigned int i, j;
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    *luma_weight_flag    = h->luma_weight_flag[list];
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    *chroma_weight_flag  = h->chroma_weight_flag[list];
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    for (i = 0; i < h->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 (h->luma_weight_flag[list]) {
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            luma_weight[i] = h->luma_weight[i][list][0];
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            luma_offset[i] = h->luma_weight[i][list][1];
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        } else {
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            luma_weight[i] = 1 << h->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 (h->chroma_weight_flag[list]) {
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                chroma_weight[i][j] = h->chroma_weight[i][list][j][0];
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                chroma_offset[i][j] = h->chroma_weight[i][list][j][1];
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            } else {
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                chroma_weight[i][j] = 1 << h->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 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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    H264Context * const h = avctx->priv_data;
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    MpegEncContext * const s = &h->s;
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    struct vaapi_context * const vactx = avctx->hwaccel_context;
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    VAPictureParameterBufferH264 *pic_param;
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    VAIQMatrixBufferH264 *iq_matrix;
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    av_dlog(avctx, "start_frame()\n");
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    vactx->slice_param_size = sizeof(VASliceParameterBufferH264);
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    /* Fill in VAPictureParameterBufferH264. */
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    pic_param = ff_vaapi_alloc_pic_param(vactx, sizeof(VAPictureParameterBufferH264));
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    if (!pic_param)
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        return -1;
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    fill_vaapi_pic(&pic_param->CurrPic, s->current_picture_ptr, s->picture_structure);
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    if (fill_vaapi_ReferenceFrames(pic_param, h) < 0)
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        return -1;
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    pic_param->picture_width_in_mbs_minus1                      = s->mb_width - 1;
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    pic_param->picture_height_in_mbs_minus1                     = s->mb_height - 1;
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    pic_param->bit_depth_luma_minus8                            = h->sps.bit_depth_luma - 8;
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    pic_param->bit_depth_chroma_minus8                          = h->sps.bit_depth_chroma - 8;
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    pic_param->num_ref_frames                                   = h->sps.ref_frame_count;
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    pic_param->seq_fields.value                                 = 0; /* reset all bits */
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    pic_param->seq_fields.bits.chroma_format_idc                = h->sps.chroma_format_idc;
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    pic_param->seq_fields.bits.residual_colour_transform_flag   = h->sps.residual_color_transform_flag; /* XXX: only for 4:4:4 high profile? */
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    pic_param->seq_fields.bits.gaps_in_frame_num_value_allowed_flag = h->sps.gaps_in_frame_num_allowed_flag;
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    pic_param->seq_fields.bits.frame_mbs_only_flag              = h->sps.frame_mbs_only_flag;
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    pic_param->seq_fields.bits.mb_adaptive_frame_field_flag     = h->sps.mb_aff;
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    pic_param->seq_fields.bits.direct_8x8_inference_flag        = h->sps.direct_8x8_inference_flag;
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    pic_param->seq_fields.bits.MinLumaBiPredSize8x8             = h->sps.level_idc >= 31; /* A.3.3.2 */
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    pic_param->seq_fields.bits.log2_max_frame_num_minus4        = h->sps.log2_max_frame_num - 4;
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    pic_param->seq_fields.bits.pic_order_cnt_type               = h->sps.poc_type;
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    pic_param->seq_fields.bits.log2_max_pic_order_cnt_lsb_minus4 = h->sps.log2_max_poc_lsb - 4;
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    pic_param->seq_fields.bits.delta_pic_order_always_zero_flag = h->sps.delta_pic_order_always_zero_flag;
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    pic_param->num_slice_groups_minus1                          = h->pps.slice_group_count - 1;
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    pic_param->slice_group_map_type                             = h->pps.mb_slice_group_map_type;
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    pic_param->slice_group_change_rate_minus1                   = 0; /* XXX: unimplemented in FFmpeg */
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    pic_param->pic_init_qp_minus26                              = h->pps.init_qp - 26;
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    pic_param->pic_init_qs_minus26                              = h->pps.init_qs - 26;
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    pic_param->chroma_qp_index_offset                           = h->pps.chroma_qp_index_offset[0];
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    pic_param->second_chroma_qp_index_offset                    = h->pps.chroma_qp_index_offset[1];
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    pic_param->pic_fields.value                                 = 0; /* reset all bits */
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    pic_param->pic_fields.bits.entropy_coding_mode_flag         = h->pps.cabac;
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    pic_param->pic_fields.bits.weighted_pred_flag               = h->pps.weighted_pred;
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    pic_param->pic_fields.bits.weighted_bipred_idc              = h->pps.weighted_bipred_idc;
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    pic_param->pic_fields.bits.transform_8x8_mode_flag          = h->pps.transform_8x8_mode;
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    pic_param->pic_fields.bits.field_pic_flag                   = s->picture_structure != PICT_FRAME;
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    pic_param->pic_fields.bits.constrained_intra_pred_flag      = h->pps.constrained_intra_pred;
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    pic_param->pic_fields.bits.pic_order_present_flag           = h->pps.pic_order_present;
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    pic_param->pic_fields.bits.deblocking_filter_control_present_flag = h->pps.deblocking_filter_parameters_present;
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    pic_param->pic_fields.bits.redundant_pic_cnt_present_flag   = h->pps.redundant_pic_cnt_present;
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    pic_param->pic_fields.bits.reference_pic_flag               = h->nal_ref_idc != 0;
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    pic_param->frame_num                                        = h->frame_num;
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    /* Fill in VAIQMatrixBufferH264. */
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    iq_matrix = ff_vaapi_alloc_iq_matrix(vactx, sizeof(VAIQMatrixBufferH264));
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    if (!iq_matrix)
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        return -1;
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    memcpy(iq_matrix->ScalingList4x4, h->pps.scaling_matrix4, sizeof(iq_matrix->ScalingList4x4));
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    memcpy(iq_matrix->ScalingList8x8, h->pps.scaling_matrix8, sizeof(iq_matrix->ScalingList8x8));
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    return 0;
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}
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/** End a hardware decoding based frame. */
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static int end_frame(AVCodecContext *avctx)
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{
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    H264Context * const h = avctx->priv_data;
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    av_dlog(avctx, "end_frame()\n");
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    return ff_vaapi_common_end_frame(&h->s);
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}
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/** Decode the given H.264 slice with VA API. */
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static int decode_slice(AVCodecContext *avctx,
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                        const uint8_t  *buffer,
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                        uint32_t        size)
301
{
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    H264Context * const h = avctx->priv_data;
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    MpegEncContext * const s = &h->s;
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    VASliceParameterBufferH264 *slice_param;
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    av_dlog(avctx, "decode_slice(): buffer %p, size %d\n", buffer, size);
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    /* Fill in VASliceParameterBufferH264. */
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    slice_param = (VASliceParameterBufferH264 *)ff_vaapi_alloc_slice(avctx->hwaccel_context, buffer, size);
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    if (!slice_param)
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        return -1;
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    slice_param->slice_data_bit_offset          = get_bits_count(&h->s.gb) + 8; /* bit buffer started beyond nal_unit_type */
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    slice_param->first_mb_in_slice              = (s->mb_y >> FIELD_OR_MBAFF_PICTURE) * s->mb_width + s->mb_x;
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    slice_param->slice_type                     = ff_h264_get_slice_type(h);
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    slice_param->direct_spatial_mv_pred_flag    = h->slice_type == FF_B_TYPE ? h->direct_spatial_mv_pred : 0;
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    slice_param->num_ref_idx_l0_active_minus1   = h->list_count > 0 ? h->ref_count[0] - 1 : 0;
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    slice_param->num_ref_idx_l1_active_minus1   = h->list_count > 1 ? h->ref_count[1] - 1 : 0;
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    slice_param->cabac_init_idc                 = h->cabac_init_idc;
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    slice_param->slice_qp_delta                 = s->qscale - h->pps.init_qp;
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    slice_param->disable_deblocking_filter_idc  = h->deblocking_filter < 2 ? !h->deblocking_filter : h->deblocking_filter;
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    slice_param->slice_alpha_c0_offset_div2     = h->slice_alpha_c0_offset / 2 - 26;
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    slice_param->slice_beta_offset_div2         = h->slice_beta_offset     / 2 - 26;
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    slice_param->luma_log2_weight_denom         = h->luma_log2_weight_denom;
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    slice_param->chroma_log2_weight_denom       = h->chroma_log2_weight_denom;
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    fill_vaapi_RefPicList(slice_param->RefPicList0, h->ref_list[0], h->list_count > 0 ? h->ref_count[0] : 0);
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    fill_vaapi_RefPicList(slice_param->RefPicList1, h->ref_list[1], h->list_count > 1 ? h->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,   slice_param->luma_weight_l0,   slice_param->luma_offset_l0,
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                                       &slice_param->chroma_weight_l0_flag, slice_param->chroma_weight_l0, 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,   slice_param->luma_weight_l1,   slice_param->luma_offset_l1,
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                                       &slice_param->chroma_weight_l1_flag, slice_param->chroma_weight_l1, slice_param->chroma_offset_l1);
335
    return 0;
336
}
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338
AVHWAccel ff_h264_vaapi_hwaccel = {
339
    .name           = "h264_vaapi",
340
    .type           = AVMEDIA_TYPE_VIDEO,
341
    .id             = CODEC_ID_H264,
342
    .pix_fmt        = PIX_FMT_VAAPI_VLD,
343
    .capabilities   = 0,
344
    .start_frame    = start_frame,
345
    .end_frame      = end_frame,
346
    .decode_slice   = decode_slice,
347
    .priv_data_size = 0,
348
};