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ffmpeg/libavcodec/dxva2_h264.c
Laurent Aimar 92c6a099ba H264 DXVA2 implementation 
It allows VLD H264 decoding using DXVA2 (GPU assisted decoding API under
VISTA and Windows 7).
 It is implemented by using AVHWAccel API. It has been tested successfully
for some time in VLC using an nvidia card on Windows 7.

 To compile it, you need to have the system header dxva2api.h (either from
microsoft or using http://downloads.videolan.org/pub/videolan/testing/contrib/dxva2api.h)
 The generated libavcodec.dll does not depend directly on any new lib as
the necessary objects are given by the application using FFmpeg.

Originally committed as revision 21353 to svn://svn.ffmpeg.org/ffmpeg/trunk
2010-01-20 18:54:51 +00:00

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/*
* DXVA2 H264 HW acceleration.
*
* copyright (c) 2009 Laurent Aimar
*
* 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 "dxva2.h"
#include "avcodec.h"
#include "mpegvideo.h"
#include "h264.h"
#include "h264data.h"
struct dxva2_picture_context {
DXVA_PicParams_H264 pp;
DXVA_Qmatrix_H264 qm;
unsigned slice_count;
DXVA_Slice_H264_Short slice_short[MAX_SLICES];
DXVA_Slice_H264_Long slice_long[MAX_SLICES];
const uint8_t *bitstream;
unsigned bitstream_size;
};
static void *get_surface(const Picture *picture)
{
return picture->data[3];
}
static unsigned get_surface_index(const struct dxva_context *ctx,
const Picture *picture)
{
void *surface = get_surface(picture);
unsigned i;
for (i = 0; i < ctx->surface_count; i++)
if (ctx->surface[i] == surface)
return i;
assert(0);
return 0;
}
static void fill_picture_entry(DXVA_PicEntry_H264 *pic,
unsigned index, unsigned flag)
{
assert((index&0x7f) == index && (flag&0x01) == flag);
pic->bPicEntry = index | (flag << 7);
}
static void fill_picture_parameters(struct dxva_context *ctx, const H264Context *h,
DXVA_PicParams_H264 *pp)
{
const MpegEncContext *s = &h->s;
const Picture *current_picture = s->current_picture_ptr;
int i;
memset(pp, 0, sizeof(*pp));
/* Configure current picture */
fill_picture_entry(&pp->CurrPic,
get_surface_index(ctx, current_picture),
s->picture_structure == PICT_BOTTOM_FIELD);
/* Configure the set of references */
pp->UsedForReferenceFlags = 0;
pp->NonExistingFrameFlags = 0;
for (i = 0; i < FF_ARRAY_ELEMS(pp->RefFrameList); i++) {
if (i < h->short_ref_count + h->long_ref_count) {
const Picture *r;
if (i < h->short_ref_count) {
r = h->short_ref[i];
assert(!r->long_ref);
} else {
r = h->long_ref[i - h->short_ref_count];
assert(r->long_ref);
}
fill_picture_entry(&pp->RefFrameList[i],
get_surface_index(ctx, r),
r->long_ref != 0);
if ((r->reference & PICT_TOP_FIELD) && r->field_poc[0] != INT_MAX)
pp->FieldOrderCntList[i][0] = r->field_poc[0];
if ((r->reference & PICT_BOTTOM_FIELD) && r->field_poc[1] != INT_MAX)
pp->FieldOrderCntList[i][1] = r->field_poc[1];
pp->FrameNumList[i] = r->long_ref ? r->pic_id : r->frame_num;
if (r->reference & PICT_TOP_FIELD)
pp->UsedForReferenceFlags |= 1 << (2*i + 0);
if (r->reference & PICT_BOTTOM_FIELD)
pp->UsedForReferenceFlags |= 1 << (2*i + 1);
} else {
pp->RefFrameList[i].bPicEntry = 0xff;
pp->FieldOrderCntList[i][0] = 0;
pp->FieldOrderCntList[i][1] = 0;
pp->FrameNumList[i] = 0;
}
}
pp->wFrameWidthInMbsMinus1 = s->mb_width - 1;
pp->wFrameHeightInMbsMinus1 = s->mb_height - 1;
pp->num_ref_frames = h->sps.ref_frame_count;
pp->wBitFields = ((s->picture_structure != PICT_FRAME) << 0) |
(h->sps.mb_aff << 1) |
(h->sps.residual_color_transform_flag << 2) |
/* sp_for_switch_flag (not implemented by FFmpeg) */
(0 << 3) |
(h->sps.chroma_format_idc << 4) |
((h->nal_ref_idc != 0) << 6) |
(h->pps.constrained_intra_pred << 7) |
(h->pps.weighted_pred << 8) |
(h->pps.weighted_bipred_idc << 9) |
/* MbsConsecutiveFlag */
(1 << 11) |
(h->sps.frame_mbs_only_flag << 12) |
(h->pps.transform_8x8_mode << 13) |
((h->sps.level_idc >= 31) << 14) |
/* IntraPicFlag (Modified if we detect a non
* intra slice in decode_slice) */
(1 << 15);
pp->bit_depth_luma_minus8 = h->sps.bit_depth_luma - 8;
pp->bit_depth_chroma_minus8 = h->sps.bit_depth_chroma - 8;
pp->Reserved16Bits = 3; /* FIXME is there a way to detect the right mode ? */
pp->StatusReportFeedbackNumber = 1 + ctx->report_id++;
pp->CurrFieldOrderCnt[0] = 0;
if ((s->picture_structure & PICT_TOP_FIELD) &&
current_picture->field_poc[0] != INT_MAX)
pp->CurrFieldOrderCnt[0] = current_picture->field_poc[0];
pp->CurrFieldOrderCnt[1] = 0;
if ((s->picture_structure & PICT_BOTTOM_FIELD) &&
current_picture->field_poc[1] != INT_MAX)
pp->CurrFieldOrderCnt[1] = current_picture->field_poc[1];
pp->pic_init_qs_minus26 = h->pps.init_qs - 26;
pp->chroma_qp_index_offset = h->pps.chroma_qp_index_offset[0];
pp->second_chroma_qp_index_offset = h->pps.chroma_qp_index_offset[1];
pp->ContinuationFlag = 1;
pp->pic_init_qp_minus26 = h->pps.init_qp - 26;
pp->num_ref_idx_l0_active_minus1 = h->pps.ref_count[0] - 1;
pp->num_ref_idx_l1_active_minus1 = h->pps.ref_count[1] - 1;
pp->Reserved8BitsA = 0;
pp->frame_num = h->frame_num;
pp->log2_max_frame_num_minus4 = h->sps.log2_max_frame_num - 4;
pp->pic_order_cnt_type = h->sps.poc_type;
if (h->sps.poc_type == 0)
pp->log2_max_pic_order_cnt_lsb_minus4 = h->sps.log2_max_poc_lsb - 4;
else if (h->sps.poc_type == 1)
pp->delta_pic_order_always_zero_flag = h->sps.delta_pic_order_always_zero_flag;
pp->direct_8x8_inference_flag = h->sps.direct_8x8_inference_flag;
pp->entropy_coding_mode_flag = h->pps.cabac;
pp->pic_order_present_flag = h->pps.pic_order_present;
pp->num_slice_groups_minus1 = h->pps.slice_group_count - 1;
pp->slice_group_map_type = h->pps.mb_slice_group_map_type;
pp->deblocking_filter_control_present_flag = h->pps.deblocking_filter_parameters_present;
pp->redundant_pic_cnt_present_flag= h->pps.redundant_pic_cnt_present;
pp->Reserved8BitsB = 0;
pp->slice_group_change_rate_minus1= 0; /* XXX not implemented by FFmpeg */
//pp->SliceGroupMap[810]; /* XXX not implemented by FFmpeg */
}
static void fill_scaling_lists(const H264Context *h, DXVA_Qmatrix_H264 *qm)
{
unsigned i, j;
memset(qm, 0, sizeof(*qm));
for (i = 0; i < 6; i++)
for (j = 0; j < 16; j++)
qm->bScalingLists4x4[i][j] = h->pps.scaling_matrix4[i][zigzag_scan[j]];
for (i = 0; i < 2; i++)
for (j = 0; j < 64; j++)
qm->bScalingLists8x8[i][j] = h->pps.scaling_matrix8[i][ff_zigzag_direct[j]];
}
static int is_slice_short(struct dxva_context *ctx)
{
assert(ctx->cfg->ConfigBitstreamRaw == 1 ||
ctx->cfg->ConfigBitstreamRaw == 2);
return ctx->cfg->ConfigBitstreamRaw == 2;
}
static void fill_slice_short(DXVA_Slice_H264_Short *slice,
unsigned position, unsigned size)
{
memset(slice, 0, sizeof(*slice));
slice->BSNALunitDataLocation = position;
slice->SliceBytesInBuffer = size;
slice->wBadSliceChopping = 0;
}
static void fill_slice_long(AVCodecContext *avctx, DXVA_Slice_H264_Long *slice,
unsigned position, unsigned size)
{
H264Context *h = avctx->priv_data; /* FIXME Can't use const because of get_bits_count */
struct dxva_context *ctx = avctx->hwaccel_context;
MpegEncContext *s = &h->s;
unsigned list;
memset(slice, 0, sizeof(*slice));
slice->BSNALunitDataLocation = position;
slice->SliceBytesInBuffer = size;
slice->wBadSliceChopping = 0;
slice->first_mb_in_slice = (s->mb_y >> FIELD_OR_MBAFF_PICTURE) * s->mb_width + s->mb_x;
slice->NumMbsForSlice = 0; /* XXX it is set once we have all slices */
slice->BitOffsetToSliceData = get_bits_count(&s->gb) + 8;
slice->slice_type = ff_h264_get_slice_type(h);
if (h->slice_type_fixed)
slice->slice_type += 5;
slice->luma_log2_weight_denom = h->luma_log2_weight_denom;
slice->chroma_log2_weight_denom = h->chroma_log2_weight_denom;
if (h->list_count > 0)
slice->num_ref_idx_l0_active_minus1 = h->ref_count[0] - 1;
if (h->list_count > 1)
slice->num_ref_idx_l1_active_minus1 = h->ref_count[1] - 1;
slice->slice_alpha_c0_offset_div2 = h->slice_alpha_c0_offset / 2;
slice->slice_beta_offset_div2 = h->slice_beta_offset / 2;
slice->Reserved8Bits = 0;
for (list = 0; list < 2; list++) {
unsigned i;
for (i = 0; i < FF_ARRAY_ELEMS(slice->RefPicList[list]); i++) {
if (list < h->list_count && i < h->ref_count[list]) {
const Picture *r = &h->ref_list[list][i];
unsigned plane;
fill_picture_entry(&slice->RefPicList[list][i],
get_surface_index(ctx, r),
r->reference == PICT_BOTTOM_FIELD);
for (plane = 0; plane < 3; plane++) {
int w, o;
if (plane == 0 && h->luma_weight_flag[list]) {
w = h->luma_weight[list][i];
o = h->luma_offset[list][i];
} else if (plane >= 1 && h->chroma_weight_flag[list]) {
w = h->chroma_weight[list][i][plane-1];
o = h->chroma_offset[list][i][plane-1];
} else {
w = 1 << (plane == 0 ? h->luma_log2_weight_denom :
h->chroma_log2_weight_denom);
o = 0;
}
slice->Weights[list][i][plane][0] = w;
slice->Weights[list][i][plane][1] = o;
}
} else {
unsigned plane;
slice->RefPicList[list][i].bPicEntry = 0xff;
for (plane = 0; plane < 3; plane++) {
slice->Weights[list][i][plane][0] = 0;
slice->Weights[list][i][plane][1] = 0;
}
}
}
}
slice->slice_qs_delta = 0; /* XXX not implemented by FFmpeg */
slice->slice_qp_delta = s->qscale - h->pps.init_qp;
slice->redundant_pic_cnt = h->redundant_pic_count;
if (h->slice_type == FF_B_TYPE)
slice->direct_spatial_mv_pred_flag = h->direct_spatial_mv_pred;
slice->cabac_init_idc = h->pps.cabac ? h->cabac_init_idc : 0;
if (h->deblocking_filter < 2)
slice->disable_deblocking_filter_idc = 1 - h->deblocking_filter;
else
slice->disable_deblocking_filter_idc = h->deblocking_filter;
slice->slice_id = h->current_slice - 1;
}
static int commit_buffer(AVCodecContext *avctx,
struct dxva_context *ctx,
DXVA2_DecodeBufferDesc *dsc,
unsigned type, const void *data, unsigned size,
unsigned mb_count)
{
void *dxva_data;
unsigned dxva_size;
int result;
if (FAILED(IDirectXVideoDecoder_GetBuffer(ctx->decoder, type,
&dxva_data, &dxva_size))) {
av_log(avctx, AV_LOG_ERROR, "Failed to get a buffer for %d\n", type);
return -1;
}
if (size <= dxva_size) {
memcpy(dxva_data, data, size);
memset(dsc, 0, sizeof(*dsc));
dsc->CompressedBufferType = type;
dsc->DataSize = size;
dsc->NumMBsInBuffer = mb_count;
result = 0;
} else {
av_log(avctx, AV_LOG_ERROR, "Buffer for type %d was too small\n", type);
result = -1;
}
if (FAILED(IDirectXVideoDecoder_ReleaseBuffer(ctx->decoder, type))) {
av_log(avctx, AV_LOG_ERROR, "Failed to release buffer type %d\n", type);
result = -1;
}
return result;
}
static int commit_bitstream_and_slice_buffer(AVCodecContext *avctx,
struct dxva_context *ctx,
struct dxva2_picture_context *ctx_pic,
DXVA2_DecodeBufferDesc *bs,
DXVA2_DecodeBufferDesc *sc,
unsigned mb_count)
{
DXVA_Slice_H264_Short *slice = NULL;
uint8_t *dxva_data, *current, *end;
unsigned dxva_size;
void *slice_data;
unsigned slice_size;
unsigned padding;
unsigned i;
/* Create an annex B bitstream buffer with only slice NAL and finalize slice */
if (FAILED(IDirectXVideoDecoder_GetBuffer(ctx->decoder,
DXVA2_BitStreamDateBufferType,
&dxva_data, &dxva_size)))
return -1;
current = dxva_data;
end = dxva_data + dxva_size;
for (i = 0; i < ctx_pic->slice_count; i++) {
static const uint8_t start_code[] = { 0, 0, 1 };
static const unsigned start_code_size = sizeof(start_code);
unsigned position, size;
assert(offsetof(DXVA_Slice_H264_Short, BSNALunitDataLocation) ==
offsetof(DXVA_Slice_H264_Long, BSNALunitDataLocation));
assert(offsetof(DXVA_Slice_H264_Short, SliceBytesInBuffer) ==
offsetof(DXVA_Slice_H264_Long, SliceBytesInBuffer));
if (is_slice_short(ctx))
slice = &ctx_pic->slice_short[i];
else
slice = (DXVA_Slice_H264_Short*)&ctx_pic->slice_long[i];
position = slice->BSNALunitDataLocation;
size = slice->SliceBytesInBuffer;
if (start_code_size + size > end - current) {
av_log(avctx, AV_LOG_ERROR, "Failed to build bitstream");
break;
}
slice->BSNALunitDataLocation = current - dxva_data;
slice->SliceBytesInBuffer = start_code_size + size;
if (!is_slice_short(ctx)) {
DXVA_Slice_H264_Long *slice_long = (DXVA_Slice_H264_Long*)slice;
if (i < ctx_pic->slice_count - 1)
slice_long->NumMbsForSlice =
slice_long[1].first_mb_in_slice - slice_long[0].first_mb_in_slice;
else
slice_long->NumMbsForSlice = mb_count - slice_long->first_mb_in_slice;
}
memcpy(current, start_code, start_code_size);
current += start_code_size;
memcpy(current, &ctx_pic->bitstream[position], size);
current += size;
}
padding = FFMIN(128 - ((current - dxva_data) & 127), end - current);
if (slice && padding > 0) {
memset(current, 0, padding);
current += padding;
slice->SliceBytesInBuffer += padding;
}
if (FAILED(IDirectXVideoDecoder_ReleaseBuffer(ctx->decoder,
DXVA2_BitStreamDateBufferType)))
return -1;
if (i < ctx_pic->slice_count)
return -1;
memset(bs, 0, sizeof(*bs));
bs->CompressedBufferType = DXVA2_BitStreamDateBufferType;
bs->DataSize = current - dxva_data;
bs->NumMBsInBuffer = mb_count;
if (is_slice_short(ctx)) {
slice_data = ctx_pic->slice_short;
slice_size = ctx_pic->slice_count * sizeof(*ctx_pic->slice_short);
} else {
slice_data = ctx_pic->slice_long;
slice_size = ctx_pic->slice_count * sizeof(*ctx_pic->slice_long);
}
assert((bs->DataSize & 127) == 0);
return commit_buffer(avctx, ctx, sc,
DXVA2_SliceControlBufferType,
slice_data, slice_size, mb_count);
}
static int start_frame(AVCodecContext *avctx,
av_unused const uint8_t *buffer,
av_unused uint32_t size)
{
const H264Context *h = avctx->priv_data;
struct dxva_context *ctx = avctx->hwaccel_context;
struct dxva2_picture_context *ctx_pic = h->s.current_picture_ptr->hwaccel_picture_private;
if (!ctx->decoder || !ctx->cfg || ctx->surface_count <= 0)
return -1;
assert(ctx_pic);
/* Fill up DXVA_PicParams_H264 */
fill_picture_parameters(ctx, h, &ctx_pic->pp);
/* Fill up DXVA_Qmatrix_H264 */
fill_scaling_lists(h, &ctx_pic->qm);
ctx_pic->slice_count = 0;
ctx_pic->bitstream_size = 0;
ctx_pic->bitstream = NULL;
return 0;
}
static int decode_slice(AVCodecContext *avctx,
const uint8_t *buffer, uint32_t size)
{
H264Context *h = avctx->priv_data; /* FIXME Can't use const because of get_bits_count */
struct dxva_context *ctx = avctx->hwaccel_context;
const Picture *current_picture = h->s.current_picture_ptr;
struct dxva2_picture_context *ctx_pic = current_picture->hwaccel_picture_private;
unsigned position;
if (ctx_pic->slice_count >= MAX_SLICES)
return -1;
if (!ctx_pic->bitstream)
ctx_pic->bitstream = buffer;
ctx_pic->bitstream_size += size;
position = buffer - ctx_pic->bitstream;
if (is_slice_short(ctx))
fill_slice_short(&ctx_pic->slice_short[ctx_pic->slice_count],
position, size);
else
fill_slice_long(avctx, &ctx_pic->slice_long[ctx_pic->slice_count],
position, size);
ctx_pic->slice_count++;
if (h->slice_type != FF_I_TYPE && h->slice_type != FF_SI_TYPE)
ctx_pic->pp.wBitFields &= ~(1 << 15); /* Set IntraPicFlag to 0 */
return 0;
}
static int end_frame(AVCodecContext *avctx)
{
H264Context *h = avctx->priv_data;
MpegEncContext *s = &h->s;
const unsigned mb_count = s->mb_width * s->mb_height;
struct dxva_context *ctx = avctx->hwaccel_context;
const Picture *current_picture = h->s.current_picture_ptr;
struct dxva2_picture_context *ctx_pic = current_picture->hwaccel_picture_private;
unsigned buffer_count = 0;
DXVA2_DecodeBufferDesc buffer[4];
DXVA2_DecodeExecuteParams exec;
int result;
if (ctx_pic->slice_count <= 0 || ctx_pic->bitstream_size <= 0)
return -1;
if (FAILED(IDirectXVideoDecoder_BeginFrame(ctx->decoder,
get_surface(current_picture),
NULL))) {
av_log(avctx, AV_LOG_ERROR, "Failed to begin frame\n");
return -1;
}
result = commit_buffer(avctx, ctx, &buffer[buffer_count],
DXVA2_PictureParametersBufferType,
&ctx_pic->pp, sizeof(ctx_pic->pp), 0);
if (result) {
av_log(avctx, AV_LOG_ERROR,
"Failed to add picture parameter buffer\n");
goto end;
}
buffer_count++;
result = commit_buffer(avctx, ctx, &buffer[buffer_count],
DXVA2_InverseQuantizationMatrixBufferType,
&ctx_pic->qm, sizeof(ctx_pic->qm), 0);
if (result) {
av_log(avctx, AV_LOG_ERROR,
"Failed to add inverse quantization matrix buffer\n");
goto end;
}
buffer_count++;
result = commit_bitstream_and_slice_buffer(avctx, ctx, ctx_pic,
&buffer[buffer_count + 0],
&buffer[buffer_count + 1],
mb_count);
if (result) {
av_log(avctx, AV_LOG_ERROR,
"Failed to add bitstream or slice control buffer\n");
goto end;
}
buffer_count += 2;
/* TODO Film Grain when possible */
assert(buffer_count == 4);
memset(&exec, 0, sizeof(exec));
exec.NumCompBuffers = buffer_count;
exec.pCompressedBuffers = buffer;
exec.pExtensionData = NULL;
if (FAILED(IDirectXVideoDecoder_Execute(ctx->decoder, &exec))) {
av_log(avctx, AV_LOG_ERROR, "Failed to execute\n");
result = -1;
}
end:
if (FAILED(IDirectXVideoDecoder_EndFrame(ctx->decoder, NULL))) {
av_log(avctx, AV_LOG_ERROR, "Failed to end frame\n");
result = -1;
}
if (!result)
ff_draw_horiz_band(s, 0, s->avctx->height);
return result;
}
AVHWAccel h264_dxva2_hwaccel = {
.name = "h264_dxva2",
.type = CODEC_TYPE_VIDEO,
.id = CODEC_ID_H264,
.pix_fmt = PIX_FMT_DXVA2_VLD,
.capabilities = 0,
.start_frame = start_frame,
.decode_slice = decode_slice,
.end_frame = end_frame,
.priv_data_size = sizeof(struct dxva2_picture_context),
};
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