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ffmpeg/libavcodec/dxva2_mpeg2.c

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/*
* MPEG-2 HW acceleration.
*
* copyright (c) 2010 Laurent Aimar
*
* 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 "dxva2_internal.h"
#define MAX_SLICES (SLICE_MAX_START_CODE - SLICE_MIN_START_CODE + 1)
struct dxva2_picture_context {
DXVA_PictureParameters pp;
DXVA_QmatrixData qm;
unsigned slice_count;
DXVA_SliceInfo slice[MAX_SLICES];
const uint8_t *bitstream;
unsigned bitstream_size;
};
static void fill_picture_parameters(AVCodecContext *avctx,
struct dxva_context *ctx,
const struct MpegEncContext *s,
DXVA_PictureParameters *pp)
{
const Picture *current_picture = s->current_picture_ptr;
int is_field = s->picture_structure != PICT_FRAME;
memset(pp, 0, sizeof(*pp));
pp->wDecodedPictureIndex = ff_dxva2_get_surface_index(ctx, current_picture);
pp->wDeblockedPictureIndex = 0;
if (s->pict_type != AV_PICTURE_TYPE_I)
pp->wForwardRefPictureIndex = ff_dxva2_get_surface_index(ctx, &s->last_picture);
else
pp->wForwardRefPictureIndex = 0xffff;
if (s->pict_type == AV_PICTURE_TYPE_B)
pp->wBackwardRefPictureIndex = ff_dxva2_get_surface_index(ctx, &s->next_picture);
else
pp->wBackwardRefPictureIndex = 0xffff;
pp->wPicWidthInMBminus1 = s->mb_width - 1;
pp->wPicHeightInMBminus1 = (s->mb_height >> is_field) - 1;
pp->bMacroblockWidthMinus1 = 15;
pp->bMacroblockHeightMinus1 = 15;
pp->bBlockWidthMinus1 = 7;
pp->bBlockHeightMinus1 = 7;
pp->bBPPminus1 = 7;
pp->bPicStructure = s->picture_structure;
pp->bSecondField = is_field && !s->first_field;
pp->bPicIntra = s->pict_type == AV_PICTURE_TYPE_I;
pp->bPicBackwardPrediction = s->pict_type == AV_PICTURE_TYPE_B;
pp->bBidirectionalAveragingMode = 0;
pp->bMVprecisionAndChromaRelation= 0; /* FIXME */
pp->bChromaFormat = s->chroma_format;
pp->bPicScanFixed = 1;
pp->bPicScanMethod = s->alternate_scan ? 1 : 0;
pp->bPicReadbackRequests = 0;
pp->bRcontrol = 0;
pp->bPicSpatialResid8 = 0;
pp->bPicOverflowBlocks = 0;
pp->bPicExtrapolation = 0;
pp->bPicDeblocked = 0;
pp->bPicDeblockConfined = 0;
pp->bPic4MVallowed = 0;
pp->bPicOBMC = 0;
pp->bPicBinPB = 0;
pp->bMV_RPS = 0;
pp->bReservedBits = 0;
pp->wBitstreamFcodes = (s->mpeg_f_code[0][0] << 12) |
(s->mpeg_f_code[0][1] << 8) |
(s->mpeg_f_code[1][0] << 4) |
(s->mpeg_f_code[1][1] );
pp->wBitstreamPCEelements = (s->intra_dc_precision << 14) |
(s->picture_structure << 12) |
(s->top_field_first << 11) |
(s->frame_pred_frame_dct << 10) |
(s->concealment_motion_vectors << 9) |
(s->q_scale_type << 8) |
(s->intra_vlc_format << 7) |
(s->alternate_scan << 6) |
(s->repeat_first_field << 5) |
(s->chroma_420_type << 4) |
(s->progressive_frame << 3);
pp->bBitstreamConcealmentNeed = 0;
pp->bBitstreamConcealmentMethod = 0;
}
static void fill_quantization_matrices(AVCodecContext *avctx,
struct dxva_context *ctx,
const struct MpegEncContext *s,
DXVA_QmatrixData *qm)
{
int i;
for (i = 0; i < 4; i++)
qm->bNewQmatrix[i] = 1;
for (i = 0; i < 64; i++) {
int n = s->dsp.idct_permutation[ff_zigzag_direct[i]];
qm->Qmatrix[0][i] = s->intra_matrix[n];;
qm->Qmatrix[1][i] = s->inter_matrix[n];;
qm->Qmatrix[2][i] = s->chroma_intra_matrix[n];;
qm->Qmatrix[3][i] = s->chroma_inter_matrix[n];;
}
}
static void fill_slice(AVCodecContext *avctx,
const struct MpegEncContext *s,
DXVA_SliceInfo *slice,
unsigned position,
const uint8_t *buffer, unsigned size)
{
int is_field = s->picture_structure != PICT_FRAME;
GetBitContext gb;
memset(slice, 0, sizeof(*slice));
slice->wHorizontalPosition = s->mb_x;
slice->wVerticalPosition = s->mb_y >> is_field;
slice->dwSliceBitsInBuffer = 8 * size;
slice->dwSliceDataLocation = position;
slice->bStartCodeBitOffset = 0;
slice->bReservedBits = 0;
/* XXX We store the index of the first MB and it will be fixed later */
slice->wNumberMBsInSlice = (s->mb_y >> is_field) * s->mb_width + s->mb_x;
slice->wBadSliceChopping = 0;
init_get_bits(&gb, &buffer[4], 8 * (size - 4));
slice->wQuantizerScaleCode = get_bits(&gb, 5);
while (get_bits1(&gb))
skip_bits(&gb, 8);
slice->wMBbitOffset = 4 * 8 + get_bits_count(&gb);
}
static int commit_bitstream_and_slice_buffer(AVCodecContext *avctx,
DXVA2_DecodeBufferDesc *bs,
DXVA2_DecodeBufferDesc *sc)
{
const struct MpegEncContext *s = avctx->priv_data;
struct dxva_context *ctx = avctx->hwaccel_context;
struct dxva2_picture_context *ctx_pic =
s->current_picture_ptr->hwaccel_picture_private;
const int is_field = s->picture_structure != PICT_FRAME;
const unsigned mb_count = s->mb_width * (s->mb_height >> is_field);
uint8_t *dxva_data, *current, *end;
unsigned dxva_size;
unsigned i;
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++) {
DXVA_SliceInfo *slice = &ctx_pic->slice[i];
unsigned position = slice->dwSliceDataLocation;
unsigned size = slice->dwSliceBitsInBuffer / 8;
if (size > end - current) {
av_log(avctx, AV_LOG_ERROR, "Failed to build bitstream");
break;
}
slice->dwSliceDataLocation = current - dxva_data;
if (i < ctx_pic->slice_count - 1)
slice->wNumberMBsInSlice =
slice[1].wNumberMBsInSlice - slice[0].wNumberMBsInSlice;
else
slice->wNumberMBsInSlice =
mb_count - slice[0].wNumberMBsInSlice;
memcpy(current, &ctx_pic->bitstream[position], size);
current += size;
}
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;
return ff_dxva2_commit_buffer(avctx, ctx, sc,
DXVA2_SliceControlBufferType,
ctx_pic->slice,
ctx_pic->slice_count * sizeof(*ctx_pic->slice),
mb_count);
}
static int dxva2_mpeg2_start_frame(AVCodecContext *avctx,
av_unused const uint8_t *buffer,
av_unused uint32_t size)
{
const struct MpegEncContext *s = avctx->priv_data;
struct dxva_context *ctx = avctx->hwaccel_context;
struct dxva2_picture_context *ctx_pic =
s->current_picture_ptr->hwaccel_picture_private;
if (!ctx->decoder || !ctx->cfg || ctx->surface_count <= 0)
return -1;
assert(ctx_pic);
fill_picture_parameters(avctx, ctx, s, &ctx_pic->pp);
fill_quantization_matrices(avctx, ctx, s, &ctx_pic->qm);
ctx_pic->slice_count = 0;
ctx_pic->bitstream_size = 0;
ctx_pic->bitstream = NULL;
return 0;
}
static int dxva2_mpeg2_decode_slice(AVCodecContext *avctx,
const uint8_t *buffer, uint32_t size)
{
const struct MpegEncContext *s = avctx->priv_data;
struct dxva2_picture_context *ctx_pic =
s->current_picture_ptr->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;
fill_slice(avctx, s, &ctx_pic->slice[ctx_pic->slice_count++], position,
buffer, size);
return 0;
}
static int dxva2_mpeg2_end_frame(AVCodecContext *avctx)
{
struct MpegEncContext *s = avctx->priv_data;
struct dxva2_picture_context *ctx_pic =
s->current_picture_ptr->hwaccel_picture_private;
int ret;
if (ctx_pic->slice_count <= 0 || ctx_pic->bitstream_size <= 0)
return -1;
ret = ff_dxva2_common_end_frame(avctx, s->current_picture_ptr,
&ctx_pic->pp, sizeof(ctx_pic->pp),
&ctx_pic->qm, sizeof(ctx_pic->qm),
commit_bitstream_and_slice_buffer);
if (!ret)
ff_mpeg_draw_horiz_band(s, 0, avctx->height);
return ret;
}
AVHWAccel ff_mpeg2_dxva2_hwaccel = {
.name = "mpeg2_dxva2",
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_MPEG2VIDEO,
.pix_fmt = AV_PIX_FMT_DXVA2_VLD,
.start_frame = dxva2_mpeg2_start_frame,
.decode_slice = dxva2_mpeg2_decode_slice,
.end_frame = dxva2_mpeg2_end_frame,
.priv_data_size = sizeof(struct dxva2_picture_context),
};
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