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FFmpeg/libavcodec/vdpau_h264.c
Anton Khirnov d4a91e6534 pthread_frame: do not run hwaccel decoding asynchronously unless it's safe 
Certain hardware decoding APIs are not guaranteed to be thread-safe, so
having the user access decoded hardware surfaces while the decoder is
running in another thread can cause failures (this is mainly known to
happen with DXVA2).

For such hwaccels, only allow the decoding thread to run while the user
is inside a lavc decode call (avcodec_send_packet/receive_frame).
2016-12-19 08:10:22 +01:00

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/*
* MPEG-4 Part 10 / AVC / H.264 HW decode acceleration through VDPAU
*
* Copyright (c) 2008 NVIDIA
* Copyright (c) 2013 Rémi Denis-Courmont
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <vdpau/vdpau.h>
#include "avcodec.h"
#include "internal.h"
#include "h264dec.h"
#include "h264_ps.h"
#include "hwaccel.h"
#include "mpegutils.h"
#include "vdpau.h"
#include "vdpau_internal.h"
static int32_t h264_foc(int foc)
{
if (foc == INT_MAX)
foc = 0;
return foc;
}
static void vdpau_h264_clear_rf(VdpReferenceFrameH264 *rf)
{
rf->surface = VDP_INVALID_HANDLE;
rf->is_long_term = VDP_FALSE;
rf->top_is_reference = VDP_FALSE;
rf->bottom_is_reference = VDP_FALSE;
rf->field_order_cnt[0] = 0;
rf->field_order_cnt[1] = 0;
rf->frame_idx = 0;
}
static void vdpau_h264_set_rf(VdpReferenceFrameH264 *rf, H264Picture *pic,
int pic_structure)
{
VdpVideoSurface surface = ff_vdpau_get_surface_id(pic->f);
if (pic_structure == 0)
pic_structure = pic->reference;
rf->surface = surface;
rf->is_long_term = pic->reference && pic->long_ref;
rf->top_is_reference = (pic_structure & PICT_TOP_FIELD) != 0;
rf->bottom_is_reference = (pic_structure & PICT_BOTTOM_FIELD) != 0;
rf->field_order_cnt[0] = h264_foc(pic->field_poc[0]);
rf->field_order_cnt[1] = h264_foc(pic->field_poc[1]);
rf->frame_idx = pic->long_ref ? pic->pic_id : pic->frame_num;
}
static void vdpau_h264_set_reference_frames(AVCodecContext *avctx)
{
H264Context * const h = avctx->priv_data;
struct vdpau_picture_context *pic_ctx = h->cur_pic_ptr->hwaccel_picture_private;
VdpPictureInfoH264 *info = &pic_ctx->info.h264;
int list;
VdpReferenceFrameH264 *rf = &info->referenceFrames[0];
#define H264_RF_COUNT FF_ARRAY_ELEMS(info->referenceFrames)
for (list = 0; list < 2; ++list) {
H264Picture **lp = list ? h->long_ref : h->short_ref;
int i, ls = list ? 16 : h->short_ref_count;
for (i = 0; i < ls; ++i) {
H264Picture *pic = lp[i];
VdpReferenceFrameH264 *rf2;
VdpVideoSurface surface_ref;
int pic_frame_idx;
if (!pic || !pic->reference)
continue;
pic_frame_idx = pic->long_ref ? pic->pic_id : pic->frame_num;
surface_ref = ff_vdpau_get_surface_id(pic->f);
rf2 = &info->referenceFrames[0];
while (rf2 != rf) {
if ((rf2->surface == surface_ref) &&
(rf2->is_long_term == pic->long_ref) &&
(rf2->frame_idx == pic_frame_idx))
break;
++rf2;
}
if (rf2 != rf) {
rf2->top_is_reference |= (pic->reference & PICT_TOP_FIELD) ? VDP_TRUE : VDP_FALSE;
rf2->bottom_is_reference |= (pic->reference & PICT_BOTTOM_FIELD) ? VDP_TRUE : VDP_FALSE;
continue;
}
if (rf >= &info->referenceFrames[H264_RF_COUNT])
continue;
vdpau_h264_set_rf(rf, pic, pic->reference);
++rf;
}
}
for (; rf < &info->referenceFrames[H264_RF_COUNT]; ++rf)
vdpau_h264_clear_rf(rf);
}
static int vdpau_h264_start_frame(AVCodecContext *avctx,
const uint8_t *buffer, uint32_t size)
{
H264Context * const h = avctx->priv_data;
const PPS *pps = h->ps.pps;
const SPS *sps = h->ps.sps;
H264Picture *pic = h->cur_pic_ptr;
struct vdpau_picture_context *pic_ctx = pic->hwaccel_picture_private;
VdpPictureInfoH264 *info = &pic_ctx->info.h264;
#ifdef VDP_DECODER_PROFILE_H264_HIGH_444_PREDICTIVE
VdpPictureInfoH264Predictive *info2 = &pic_ctx->info.h264_predictive;
#endif
/* init VdpPictureInfoH264 */
info->slice_count = 0;
info->field_order_cnt[0] = h264_foc(pic->field_poc[0]);
info->field_order_cnt[1] = h264_foc(pic->field_poc[1]);
info->is_reference = h->nal_ref_idc != 0;
info->frame_num = h->poc.frame_num;
info->field_pic_flag = h->picture_structure != PICT_FRAME;
info->bottom_field_flag = h->picture_structure == PICT_BOTTOM_FIELD;
info->num_ref_frames = sps->ref_frame_count;
info->mb_adaptive_frame_field_flag = sps->mb_aff && !info->field_pic_flag;
info->constrained_intra_pred_flag = pps->constrained_intra_pred;
info->weighted_pred_flag = pps->weighted_pred;
info->weighted_bipred_idc = pps->weighted_bipred_idc;
info->frame_mbs_only_flag = sps->frame_mbs_only_flag;
info->transform_8x8_mode_flag = pps->transform_8x8_mode;
info->chroma_qp_index_offset = pps->chroma_qp_index_offset[0];
info->second_chroma_qp_index_offset = pps->chroma_qp_index_offset[1];
info->pic_init_qp_minus26 = pps->init_qp - 26;
info->num_ref_idx_l0_active_minus1 = pps->ref_count[0] - 1;
info->num_ref_idx_l1_active_minus1 = pps->ref_count[1] - 1;
info->log2_max_frame_num_minus4 = sps->log2_max_frame_num - 4;
info->pic_order_cnt_type = sps->poc_type;
info->log2_max_pic_order_cnt_lsb_minus4 = sps->poc_type ? 0 : sps->log2_max_poc_lsb - 4;
info->delta_pic_order_always_zero_flag = sps->delta_pic_order_always_zero_flag;
info->direct_8x8_inference_flag = sps->direct_8x8_inference_flag;
#ifdef VDP_DECODER_PROFILE_H264_HIGH_444_PREDICTIVE
info2->qpprime_y_zero_transform_bypass_flag = sps->transform_bypass;
info2->separate_colour_plane_flag = sps->residual_color_transform_flag;
#endif
info->entropy_coding_mode_flag = pps->cabac;
info->pic_order_present_flag = pps->pic_order_present;
info->deblocking_filter_control_present_flag = pps->deblocking_filter_parameters_present;
info->redundant_pic_cnt_present_flag = pps->redundant_pic_cnt_present;
memcpy(info->scaling_lists_4x4, pps->scaling_matrix4,
sizeof(info->scaling_lists_4x4));
memcpy(info->scaling_lists_8x8[0], pps->scaling_matrix8[0],
sizeof(info->scaling_lists_8x8[0]));
memcpy(info->scaling_lists_8x8[1], pps->scaling_matrix8[3],
sizeof(info->scaling_lists_8x8[1]));
vdpau_h264_set_reference_frames(avctx);
return ff_vdpau_common_start_frame(pic_ctx, buffer, size);
}
static const uint8_t start_code_prefix[3] = { 0x00, 0x00, 0x01 };
static int vdpau_h264_decode_slice(AVCodecContext *avctx,
const uint8_t *buffer, uint32_t size)
{
H264Context *h = avctx->priv_data;
H264Picture *pic = h->cur_pic_ptr;
struct vdpau_picture_context *pic_ctx = pic->hwaccel_picture_private;
int val;
val = ff_vdpau_add_buffer(pic_ctx, start_code_prefix, 3);
if (val)
return val;
val = ff_vdpau_add_buffer(pic_ctx, buffer, size);
if (val)
return val;
pic_ctx->info.h264.slice_count++;
return 0;
}
static int vdpau_h264_end_frame(AVCodecContext *avctx)
{
H264Context *h = avctx->priv_data;
H264SliceContext *sl = &h->slice_ctx[0];
H264Picture *pic = h->cur_pic_ptr;
struct vdpau_picture_context *pic_ctx = pic->hwaccel_picture_private;
int val;
val = ff_vdpau_common_end_frame(avctx, pic->f, pic_ctx);
if (val < 0)
return val;
ff_h264_draw_horiz_band(h, sl, 0, h->avctx->height);
return 0;
}
static int vdpau_h264_init(AVCodecContext *avctx)
{
VdpDecoderProfile profile;
uint32_t level = avctx->level;
switch (avctx->profile & ~FF_PROFILE_H264_INTRA) {
case FF_PROFILE_H264_BASELINE:
profile = VDP_DECODER_PROFILE_H264_BASELINE;
break;
case FF_PROFILE_H264_CONSTRAINED_BASELINE:
#ifdef VDP_DECODER_PROFILE_H264_CONSTRAINED_BASELINE
profile = VDP_DECODER_PROFILE_H264_CONSTRAINED_BASELINE;
break;
#endif
case FF_PROFILE_H264_MAIN:
profile = VDP_DECODER_PROFILE_H264_MAIN;
break;
case FF_PROFILE_H264_HIGH:
profile = VDP_DECODER_PROFILE_H264_HIGH;
break;
#ifdef VDP_DECODER_PROFILE_H264_EXTENDED
case FF_PROFILE_H264_EXTENDED:
profile = VDP_DECODER_PROFILE_H264_EXTENDED;
break;
#endif
case FF_PROFILE_H264_HIGH_10:
/* XXX: High 10 can be treated as High so long as only 8 bits per
* format are supported. */
profile = VDP_DECODER_PROFILE_H264_HIGH;
break;
#ifdef VDP_DECODER_PROFILE_H264_HIGH_444_PREDICTIVE
case FF_PROFILE_H264_HIGH_422:
case FF_PROFILE_H264_HIGH_444_PREDICTIVE:
case FF_PROFILE_H264_CAVLC_444:
profile = VDP_DECODER_PROFILE_H264_HIGH_444_PREDICTIVE;
break;
#endif
default:
return AVERROR(ENOTSUP);
}
if ((avctx->profile & FF_PROFILE_H264_INTRA) && avctx->level == 11)
level = VDP_DECODER_LEVEL_H264_1b;
return ff_vdpau_common_init(avctx, profile, level);
}
AVHWAccel ff_h264_vdpau_hwaccel = {
.name = "h264_vdpau",
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_H264,
.pix_fmt = AV_PIX_FMT_VDPAU,
.start_frame = vdpau_h264_start_frame,
.end_frame = vdpau_h264_end_frame,
.decode_slice = vdpau_h264_decode_slice,
.frame_priv_data_size = sizeof(struct vdpau_picture_context),
.init = vdpau_h264_init,
.uninit = ff_vdpau_common_uninit,
.priv_data_size = sizeof(VDPAUContext),
.caps_internal = HWACCEL_CAP_ASYNC_SAFE,
};
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