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ffmpeg/libavcodec/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 "vaapi_internal.h"
#include "h264.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,
Picture *pic,
int pic_structure)
{
if (pic_structure == 0)
pic_structure = pic->reference;
va_pic->picture_id = ff_vaapi_get_surface_id(pic);
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, Picture *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)) {
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,
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++) {
Picture * const pic = h->short_ref[i];
if (pic && pic->reference && dpb_add(&dpb, pic) < 0)
return -1;
}
for (i = 0; i < 16; i++) {
Picture * const 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],
Picture *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], 0);
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(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])
{
unsigned int i, j;
*luma_weight_flag = h->luma_weight_flag[list];
*chroma_weight_flag = h->chroma_weight_flag[list];
for (i = 0; i < h->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 (h->luma_weight_flag[list]) {
luma_weight[i] = h->luma_weight[i][list][0];
luma_offset[i] = h->luma_weight[i][list][1];
} else {
luma_weight[i] = 1 << h->luma_log2_weight_denom;
luma_offset[i] = 0;
}
for (j = 0; j < 2; j++) {
if (h->chroma_weight_flag[list]) {
chroma_weight[i][j] = h->chroma_weight[i][list][j][0];
chroma_offset[i][j] = h->chroma_weight[i][list][j][1];
} else {
chroma_weight[i][j] = 1 << h->chroma_log2_weight_denom;
chroma_offset[i][j] = 0;
}
}
}
}
/** Initialize and start decoding a frame with VA API. */
static int start_frame(AVCodecContext *avctx,
av_unused const uint8_t *buffer,
av_unused uint32_t size)
{
H264Context * const h = avctx->priv_data;
MpegEncContext * const s = &h->s;
struct vaapi_context * const vactx = avctx->hwaccel_context;
VAPictureParameterBufferH264 *pic_param;
VAIQMatrixBufferH264 *iq_matrix;
dprintf(avctx, "start_frame()\n");
vactx->slice_param_size = sizeof(VASliceParameterBufferH264);
/* Fill in VAPictureParameterBufferH264. */
pic_param = ff_vaapi_alloc_pic_param(vactx, sizeof(VAPictureParameterBufferH264));
if (!pic_param)
return -1;
fill_vaapi_pic(&pic_param->CurrPic, s->current_picture_ptr, s->picture_structure);
if (fill_vaapi_ReferenceFrames(pic_param, h) < 0)
return -1;
pic_param->picture_width_in_mbs_minus1 = s->mb_width - 1;
pic_param->picture_height_in_mbs_minus1 = s->mb_height - 1;
pic_param->bit_depth_luma_minus8 = h->sps.bit_depth_luma - 8;
pic_param->bit_depth_chroma_minus8 = h->sps.bit_depth_chroma - 8;
pic_param->num_ref_frames = h->sps.ref_frame_count;
pic_param->seq_fields.value = 0; /* reset all bits */
pic_param->seq_fields.bits.chroma_format_idc = h->sps.chroma_format_idc;
pic_param->seq_fields.bits.residual_colour_transform_flag = h->sps.residual_color_transform_flag; /* XXX: only for 4:4:4 high profile? */
pic_param->seq_fields.bits.gaps_in_frame_num_value_allowed_flag = h->sps.gaps_in_frame_num_allowed_flag;
pic_param->seq_fields.bits.frame_mbs_only_flag = h->sps.frame_mbs_only_flag;
pic_param->seq_fields.bits.mb_adaptive_frame_field_flag = h->sps.mb_aff;
pic_param->seq_fields.bits.direct_8x8_inference_flag = h->sps.direct_8x8_inference_flag;
pic_param->seq_fields.bits.MinLumaBiPredSize8x8 = h->sps.level_idc >= 31; /* A.3.3.2 */
pic_param->seq_fields.bits.log2_max_frame_num_minus4 = h->sps.log2_max_frame_num - 4;
pic_param->seq_fields.bits.pic_order_cnt_type = h->sps.poc_type;
pic_param->seq_fields.bits.log2_max_pic_order_cnt_lsb_minus4 = h->sps.log2_max_poc_lsb - 4;
pic_param->seq_fields.bits.delta_pic_order_always_zero_flag = h->sps.delta_pic_order_always_zero_flag;
pic_param->num_slice_groups_minus1 = h->pps.slice_group_count - 1;
pic_param->slice_group_map_type = h->pps.mb_slice_group_map_type;
pic_param->slice_group_change_rate_minus1 = 0; /* XXX: unimplemented in FFmpeg */
pic_param->pic_init_qp_minus26 = h->pps.init_qp - 26;
pic_param->pic_init_qs_minus26 = h->pps.init_qs - 26;
pic_param->chroma_qp_index_offset = h->pps.chroma_qp_index_offset[0];
pic_param->second_chroma_qp_index_offset = h->pps.chroma_qp_index_offset[1];
pic_param->pic_fields.value = 0; /* reset all bits */
pic_param->pic_fields.bits.entropy_coding_mode_flag = h->pps.cabac;
pic_param->pic_fields.bits.weighted_pred_flag = h->pps.weighted_pred;
pic_param->pic_fields.bits.weighted_bipred_idc = h->pps.weighted_bipred_idc;
pic_param->pic_fields.bits.transform_8x8_mode_flag = h->pps.transform_8x8_mode;
pic_param->pic_fields.bits.field_pic_flag = s->picture_structure != PICT_FRAME;
pic_param->pic_fields.bits.constrained_intra_pred_flag = h->pps.constrained_intra_pred;
pic_param->pic_fields.bits.pic_order_present_flag = h->pps.pic_order_present;
pic_param->pic_fields.bits.deblocking_filter_control_present_flag = h->pps.deblocking_filter_parameters_present;
pic_param->pic_fields.bits.redundant_pic_cnt_present_flag = h->pps.redundant_pic_cnt_present;
pic_param->pic_fields.bits.reference_pic_flag = h->nal_ref_idc != 0;
pic_param->frame_num = h->frame_num;
/* Fill in VAIQMatrixBufferH264. */
iq_matrix = ff_vaapi_alloc_iq_matrix(vactx, sizeof(VAIQMatrixBufferH264));
if (!iq_matrix)
return -1;
memcpy(iq_matrix->ScalingList4x4, h->pps.scaling_matrix4, sizeof(iq_matrix->ScalingList4x4));
memcpy(iq_matrix->ScalingList8x8, h->pps.scaling_matrix8, sizeof(iq_matrix->ScalingList8x8));
return 0;
}
/** End a hardware decoding based frame. */
static int end_frame(AVCodecContext *avctx)
{
H264Context * const h = avctx->priv_data;
dprintf(avctx, "end_frame()\n");
return ff_vaapi_common_end_frame(&h->s);
}
/** Decode the given H.264 slice with VA API. */
static int decode_slice(AVCodecContext *avctx,
const uint8_t *buffer,
uint32_t size)
{
H264Context * const h = avctx->priv_data;
MpegEncContext * const s = &h->s;
VASliceParameterBufferH264 *slice_param;
dprintf(avctx, "decode_slice(): buffer %p, size %d\n", buffer, size);
/* Fill in VASliceParameterBufferH264. */
slice_param = (VASliceParameterBufferH264 *)ff_vaapi_alloc_slice(avctx->hwaccel_context, buffer, size);
if (!slice_param)
return -1;
slice_param->slice_data_bit_offset = get_bits_count(&h->s.gb) + 8; /* bit buffer started beyond nal_unit_type */
slice_param->first_mb_in_slice = (s->mb_y >> FIELD_OR_MBAFF_PICTURE) * s->mb_width + s->mb_x;
slice_param->slice_type = ff_h264_get_slice_type(h);
slice_param->direct_spatial_mv_pred_flag = h->slice_type == FF_B_TYPE ? h->direct_spatial_mv_pred : 0;
slice_param->num_ref_idx_l0_active_minus1 = h->list_count > 0 ? h->ref_count[0] - 1 : 0;
slice_param->num_ref_idx_l1_active_minus1 = h->list_count > 1 ? h->ref_count[1] - 1 : 0;
slice_param->cabac_init_idc = h->cabac_init_idc;
slice_param->slice_qp_delta = s->qscale - h->pps.init_qp;
slice_param->disable_deblocking_filter_idc = h->deblocking_filter < 2 ? !h->deblocking_filter : h->deblocking_filter;
slice_param->slice_alpha_c0_offset_div2 = h->slice_alpha_c0_offset / 2 - 26;
slice_param->slice_beta_offset_div2 = h->slice_beta_offset / 2 - 26;
slice_param->luma_log2_weight_denom = h->luma_log2_weight_denom;
slice_param->chroma_log2_weight_denom = h->chroma_log2_weight_denom;
fill_vaapi_RefPicList(slice_param->RefPicList0, h->ref_list[0], h->list_count > 0 ? h->ref_count[0] : 0);
fill_vaapi_RefPicList(slice_param->RefPicList1, h->ref_list[1], h->list_count > 1 ? h->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);
return 0;
}
AVHWAccel h264_vaapi_hwaccel = {
.name = "h264_vaapi",
.type = AVMEDIA_TYPE_VIDEO,
.id = CODEC_ID_H264,
.pix_fmt = PIX_FMT_VAAPI_VLD,
.capabilities = 0,
.start_frame = start_frame,
.end_frame = end_frame,
.decode_slice = decode_slice,
.priv_data_size = 0,
};
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