vaapi_h264.c
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/*
* H.264 HW decode acceleration through VA API
*
* Copyright (C) 2008-2009 Splitted-Desktop Systems
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "h264dec.h"
#include "h264_ps.h"
#include "hwaccel.h"
#include "vaapi_decode.h"
/**
* @file
* This file implements the glue code between FFmpeg's and VA API's
* structures for H.264 decoding.
*/
/**
* Initialize an empty VA API picture.
*
* VA API requires a fixed-size reference picture array.
*/
static void init_vaapi_pic(VAPictureH264 *va_pic)
{
va_pic->picture_id = VA_INVALID_ID;
va_pic->flags = VA_PICTURE_H264_INVALID;
va_pic->TopFieldOrderCnt = 0;
va_pic->BottomFieldOrderCnt = 0;
}
/**
* Translate an FFmpeg Picture into its VA API form.
*
* @param[out] va_pic A pointer to VA API's own picture struct
* @param[in] pic A pointer to the FFmpeg picture struct to convert
* @param[in] pic_structure The picture field type (as defined in mpegvideo.h),
* supersedes pic's field type if nonzero.
*/
static void fill_vaapi_pic(VAPictureH264 *va_pic,
const H264Picture *pic,
int pic_structure)
{
if (pic_structure == 0)
pic_structure = pic->reference;
pic_structure &= PICT_FRAME; /* PICT_TOP_FIELD|PICT_BOTTOM_FIELD */
va_pic->picture_id = ff_vaapi_get_surface_id(pic->f);
va_pic->frame_idx = pic->long_ref ? pic->pic_id : pic->frame_num;
va_pic->flags = 0;
if (pic_structure != PICT_FRAME)
va_pic->flags |= (pic_structure & PICT_TOP_FIELD) ? VA_PICTURE_H264_TOP_FIELD : VA_PICTURE_H264_BOTTOM_FIELD;
if (pic->reference)
va_pic->flags |= pic->long_ref ? VA_PICTURE_H264_LONG_TERM_REFERENCE : VA_PICTURE_H264_SHORT_TERM_REFERENCE;
va_pic->TopFieldOrderCnt = 0;
if (pic->field_poc[0] != INT_MAX)
va_pic->TopFieldOrderCnt = pic->field_poc[0];
va_pic->BottomFieldOrderCnt = 0;
if (pic->field_poc[1] != INT_MAX)
va_pic->BottomFieldOrderCnt = pic->field_poc[1];
}
/** Decoded Picture Buffer (DPB). */
typedef struct DPB {
int size; ///< Current number of reference frames in the DPB
int max_size; ///< Max number of reference frames. This is FF_ARRAY_ELEMS(VAPictureParameterBufferH264.ReferenceFrames)
VAPictureH264 *va_pics; ///< Pointer to VAPictureParameterBufferH264.ReferenceFrames array
} DPB;
/**
* Append picture to the decoded picture buffer, in a VA API form that
* merges the second field picture attributes with the first, if
* available. The decoded picture buffer's size must be large enough
* to receive the new VA API picture object.
*/
static int dpb_add(DPB *dpb, const H264Picture *pic)
{
int i;
if (dpb->size >= dpb->max_size)
return -1;
for (i = 0; i < dpb->size; i++) {
VAPictureH264 * const va_pic = &dpb->va_pics[i];
if (va_pic->picture_id == ff_vaapi_get_surface_id(pic->f)) {
VAPictureH264 temp_va_pic;
fill_vaapi_pic(&temp_va_pic, pic, 0);
if ((temp_va_pic.flags ^ va_pic->flags) & (VA_PICTURE_H264_TOP_FIELD | VA_PICTURE_H264_BOTTOM_FIELD)) {
va_pic->flags |= temp_va_pic.flags & (VA_PICTURE_H264_TOP_FIELD | VA_PICTURE_H264_BOTTOM_FIELD);
/* Merge second field */
if (temp_va_pic.flags & VA_PICTURE_H264_TOP_FIELD) {
va_pic->TopFieldOrderCnt = temp_va_pic.TopFieldOrderCnt;
} else {
va_pic->BottomFieldOrderCnt = temp_va_pic.BottomFieldOrderCnt;
}
}
return 0;
}
}
fill_vaapi_pic(&dpb->va_pics[dpb->size++], pic, 0);
return 0;
}
/** Fill in VA API reference frames array. */
static int fill_vaapi_ReferenceFrames(VAPictureParameterBufferH264 *pic_param,
const H264Context *h)
{
DPB dpb;
int i;
dpb.size = 0;
dpb.max_size = FF_ARRAY_ELEMS(pic_param->ReferenceFrames);
dpb.va_pics = pic_param->ReferenceFrames;
for (i = 0; i < dpb.max_size; i++)
init_vaapi_pic(&dpb.va_pics[i]);
for (i = 0; i < h->short_ref_count; i++) {
const H264Picture *pic = h->short_ref[i];
if (pic && pic->reference && dpb_add(&dpb, pic) < 0)
return -1;
}
for (i = 0; i < 16; i++) {
const H264Picture *pic = h->long_ref[i];
if (pic && pic->reference && dpb_add(&dpb, pic) < 0)
return -1;
}
return 0;
}
/**
* Fill in VA API reference picture lists from the FFmpeg reference
* picture list.
*
* @param[out] RefPicList VA API internal reference picture list
* @param[in] ref_list A pointer to the FFmpeg reference list
* @param[in] ref_count The number of reference pictures in ref_list
*/
static void fill_vaapi_RefPicList(VAPictureH264 RefPicList[32],
const H264Ref *ref_list,
unsigned int ref_count)
{
unsigned int i, n = 0;
for (i = 0; i < ref_count; i++)
if (ref_list[i].reference)
fill_vaapi_pic(&RefPicList[n++], ref_list[i].parent,
ref_list[i].reference);
for (; n < 32; n++)
init_vaapi_pic(&RefPicList[n]);
}
/**
* Fill in prediction weight table.
*
* VA API requires a plain prediction weight table as it does not infer
* any value.
*
* @param[in] h A pointer to the current H.264 context
* @param[in] list The reference frame list index to use
* @param[out] luma_weight_flag VA API plain luma weight flag
* @param[out] luma_weight VA API plain luma weight table
* @param[out] luma_offset VA API plain luma offset table
* @param[out] chroma_weight_flag VA API plain chroma weight flag
* @param[out] chroma_weight VA API plain chroma weight table
* @param[out] chroma_offset VA API plain chroma offset table
*/
static void fill_vaapi_plain_pred_weight_table(const H264Context *h,
int list,
unsigned char *luma_weight_flag,
short luma_weight[32],
short luma_offset[32],
unsigned char *chroma_weight_flag,
short chroma_weight[32][2],
short chroma_offset[32][2])
{
const H264SliceContext *sl = &h->slice_ctx[0];
unsigned int i, j;
*luma_weight_flag = sl->pwt.luma_weight_flag[list];
*chroma_weight_flag = sl->pwt.chroma_weight_flag[list];
for (i = 0; i < sl->ref_count[list]; i++) {
/* VA API also wants the inferred (default) values, not
only what is available in the bitstream (7.4.3.2). */
if (sl->pwt.luma_weight_flag[list]) {
luma_weight[i] = sl->pwt.luma_weight[i][list][0];
luma_offset[i] = sl->pwt.luma_weight[i][list][1];
} else {
luma_weight[i] = 1 << sl->pwt.luma_log2_weight_denom;
luma_offset[i] = 0;
}
for (j = 0; j < 2; j++) {
if (sl->pwt.chroma_weight_flag[list]) {
chroma_weight[i][j] = sl->pwt.chroma_weight[i][list][j][0];
chroma_offset[i][j] = sl->pwt.chroma_weight[i][list][j][1];
} else {
chroma_weight[i][j] = 1 << sl->pwt.chroma_log2_weight_denom;
chroma_offset[i][j] = 0;
}
}
}
}
/** Initialize and start decoding a frame with VA API. */
static int vaapi_h264_start_frame(AVCodecContext *avctx,
av_unused const uint8_t *buffer,
av_unused uint32_t size)
{
const H264Context *h = avctx->priv_data;
VAAPIDecodePicture *pic = h->cur_pic_ptr->hwaccel_picture_private;
const PPS *pps = h->ps.pps;
const SPS *sps = h->ps.sps;
VAPictureParameterBufferH264 pic_param;
VAIQMatrixBufferH264 iq_matrix;
int err;
pic->output_surface = ff_vaapi_get_surface_id(h->cur_pic_ptr->f);
pic_param = (VAPictureParameterBufferH264) {
.picture_width_in_mbs_minus1 = h->mb_width - 1,
.picture_height_in_mbs_minus1 = h->mb_height - 1,
.bit_depth_luma_minus8 = sps->bit_depth_luma - 8,
.bit_depth_chroma_minus8 = sps->bit_depth_chroma - 8,
.num_ref_frames = sps->ref_frame_count,
.seq_fields.bits = {
.chroma_format_idc = sps->chroma_format_idc,
.residual_colour_transform_flag = sps->residual_color_transform_flag,
.gaps_in_frame_num_value_allowed_flag = sps->gaps_in_frame_num_allowed_flag,
.frame_mbs_only_flag = sps->frame_mbs_only_flag,
.mb_adaptive_frame_field_flag = sps->mb_aff,
.direct_8x8_inference_flag = sps->direct_8x8_inference_flag,
.MinLumaBiPredSize8x8 = sps->level_idc >= 31, /* A.3.3.2 */
.log2_max_frame_num_minus4 = sps->log2_max_frame_num - 4,
.pic_order_cnt_type = sps->poc_type,
.log2_max_pic_order_cnt_lsb_minus4 = sps->log2_max_poc_lsb - 4,
.delta_pic_order_always_zero_flag = sps->delta_pic_order_always_zero_flag,
},
.pic_init_qp_minus26 = pps->init_qp - 26,
.pic_init_qs_minus26 = pps->init_qs - 26,
.chroma_qp_index_offset = pps->chroma_qp_index_offset[0],
.second_chroma_qp_index_offset = pps->chroma_qp_index_offset[1],
.pic_fields.bits = {
.entropy_coding_mode_flag = pps->cabac,
.weighted_pred_flag = pps->weighted_pred,
.weighted_bipred_idc = pps->weighted_bipred_idc,
.transform_8x8_mode_flag = pps->transform_8x8_mode,
.field_pic_flag = h->picture_structure != PICT_FRAME,
.constrained_intra_pred_flag = pps->constrained_intra_pred,
.pic_order_present_flag = pps->pic_order_present,
.deblocking_filter_control_present_flag = pps->deblocking_filter_parameters_present,
.redundant_pic_cnt_present_flag = pps->redundant_pic_cnt_present,
.reference_pic_flag = h->nal_ref_idc != 0,
},
.frame_num = h->poc.frame_num,
};
fill_vaapi_pic(&pic_param.CurrPic, h->cur_pic_ptr, h->picture_structure);
err = fill_vaapi_ReferenceFrames(&pic_param, h);
if (err < 0)
goto fail;
err = ff_vaapi_decode_make_param_buffer(avctx, pic,
VAPictureParameterBufferType,
&pic_param, sizeof(pic_param));
if (err < 0)
goto fail;
memcpy(iq_matrix.ScalingList4x4,
pps->scaling_matrix4, sizeof(iq_matrix.ScalingList4x4));
memcpy(iq_matrix.ScalingList8x8[0],
pps->scaling_matrix8[0], sizeof(iq_matrix.ScalingList8x8[0]));
memcpy(iq_matrix.ScalingList8x8[1],
pps->scaling_matrix8[3], sizeof(iq_matrix.ScalingList8x8[0]));
err = ff_vaapi_decode_make_param_buffer(avctx, pic,
VAIQMatrixBufferType,
&iq_matrix, sizeof(iq_matrix));
if (err < 0)
goto fail;
return 0;
fail:
ff_vaapi_decode_cancel(avctx, pic);
return err;
}
/** End a hardware decoding based frame. */
static int vaapi_h264_end_frame(AVCodecContext *avctx)
{
const H264Context *h = avctx->priv_data;
VAAPIDecodePicture *pic = h->cur_pic_ptr->hwaccel_picture_private;
H264SliceContext *sl = &h->slice_ctx[0];
int ret;
ret = ff_vaapi_decode_issue(avctx, pic);
if (ret < 0)
goto finish;
ff_h264_draw_horiz_band(h, sl, 0, h->avctx->height);
finish:
return ret;
}
/** Decode the given H.264 slice with VA API. */
static int vaapi_h264_decode_slice(AVCodecContext *avctx,
const uint8_t *buffer,
uint32_t size)
{
const H264Context *h = avctx->priv_data;
VAAPIDecodePicture *pic = h->cur_pic_ptr->hwaccel_picture_private;
const H264SliceContext *sl = &h->slice_ctx[0];
VASliceParameterBufferH264 slice_param;
int err;
slice_param = (VASliceParameterBufferH264) {
.slice_data_size = size,
.slice_data_offset = 0,
.slice_data_flag = VA_SLICE_DATA_FLAG_ALL,
.slice_data_bit_offset = get_bits_count(&sl->gb),
.first_mb_in_slice = (sl->mb_y >> FIELD_OR_MBAFF_PICTURE(h)) * h->mb_width + sl->mb_x,
.slice_type = ff_h264_get_slice_type(sl),
.direct_spatial_mv_pred_flag = sl->slice_type == AV_PICTURE_TYPE_B ? sl->direct_spatial_mv_pred : 0,
.num_ref_idx_l0_active_minus1 = sl->list_count > 0 ? sl->ref_count[0] - 1 : 0,
.num_ref_idx_l1_active_minus1 = sl->list_count > 1 ? sl->ref_count[1] - 1 : 0,
.cabac_init_idc = sl->cabac_init_idc,
.slice_qp_delta = sl->qscale - h->ps.pps->init_qp,
.disable_deblocking_filter_idc = sl->deblocking_filter < 2 ? !sl->deblocking_filter : sl->deblocking_filter,
.slice_alpha_c0_offset_div2 = sl->slice_alpha_c0_offset / 2,
.slice_beta_offset_div2 = sl->slice_beta_offset / 2,
.luma_log2_weight_denom = sl->pwt.luma_log2_weight_denom,
.chroma_log2_weight_denom = sl->pwt.chroma_log2_weight_denom,
};
fill_vaapi_RefPicList(slice_param.RefPicList0, sl->ref_list[0],
sl->list_count > 0 ? sl->ref_count[0] : 0);
fill_vaapi_RefPicList(slice_param.RefPicList1, sl->ref_list[1],
sl->list_count > 1 ? sl->ref_count[1] : 0);
fill_vaapi_plain_pred_weight_table(h, 0,
&slice_param.luma_weight_l0_flag,
slice_param.luma_weight_l0,
slice_param.luma_offset_l0,
&slice_param.chroma_weight_l0_flag,
slice_param.chroma_weight_l0,
slice_param.chroma_offset_l0);
fill_vaapi_plain_pred_weight_table(h, 1,
&slice_param.luma_weight_l1_flag,
slice_param.luma_weight_l1,
slice_param.luma_offset_l1,
&slice_param.chroma_weight_l1_flag,
slice_param.chroma_weight_l1,
slice_param.chroma_offset_l1);
err = ff_vaapi_decode_make_slice_buffer(avctx, pic,
&slice_param, sizeof(slice_param),
buffer, size);
if (err) {
ff_vaapi_decode_cancel(avctx, pic);
return err;
}
return 0;
}
const AVHWAccel ff_h264_vaapi_hwaccel = {
.name = "h264_vaapi",
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_H264,
.pix_fmt = AV_PIX_FMT_VAAPI,
.start_frame = &vaapi_h264_start_frame,
.end_frame = &vaapi_h264_end_frame,
.decode_slice = &vaapi_h264_decode_slice,
.frame_priv_data_size = sizeof(VAAPIDecodePicture),
.init = &ff_vaapi_decode_init,
.uninit = &ff_vaapi_decode_uninit,
.frame_params = &ff_vaapi_common_frame_params,
.priv_data_size = sizeof(VAAPIDecodeContext),
.caps_internal = HWACCEL_CAP_ASYNC_SAFE,
};