VC-1/WMV3 DXVA2 implementation

 It allows VLD VC-1/WMV3 decoding using DXVA2 (GPU assisted decoding API under
VISTA and Windows 7).
 It is implemented by using AVHWAccel API.

Originally committed as revision 21424 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 291 insertions, 0 deletions

diff --git a/libavcodec/dxva2_vc1.c b/libavcodec/dxva2_vc1.c
new file mode 100644
index 0000000000..95a55849be
--- /dev/null
+++ b/libavcodec/dxva2_vc1.c
@@ -0,0 +1,291 @@
+/*
+ * DXVA2 WMV3/VC-1 HW acceleration.
+ *
+ * copyright (c) 2010 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_internal.h"
+#include "vc1.h"
+#include "vc1data.h"
+
+struct dxva2_picture_context {
+    DXVA_PictureParameters pp;
+    DXVA_SliceInfo         si;
+
+    const uint8_t          *bitstream;
+    unsigned               bitstream_size;
+};
+
+static void fill_picture_parameters(AVCodecContext *avctx,
+                                    struct dxva_context *ctx, const VC1Context *v,
+                                    DXVA_PictureParameters *pp)
+{
+    const MpegEncContext *s = &v->s;
+    const Picture *current_picture = s->current_picture_ptr;
+
+    memset(pp, 0, sizeof(*pp));
+    pp->wDecodedPictureIndex    =
+    pp->wDeblockedPictureIndex  = ff_dxva2_get_surface_index(ctx, current_picture);
+    if (s->pict_type != FF_I_TYPE)
+        pp->wForwardRefPictureIndex = ff_dxva2_get_surface_index(ctx, &s->last_picture);
+    else
+        pp->wForwardRefPictureIndex = 0xffff;
+    if (s->pict_type == FF_B_TYPE)
+        pp->wBackwardRefPictureIndex = ff_dxva2_get_surface_index(ctx, &s->next_picture);
+    else
+        pp->wBackwardRefPictureIndex = 0xffff;
+    if (v->profile == PROFILE_ADVANCED) {
+        /* It is the cropped width/height -1 of the frame */
+        pp->wPicWidthInMBminus1 = avctx->width  - 1;
+        pp->wPicHeightInMBminus1= avctx->height - 1;
+    } else {
+        /* It is the coded width/height in macroblock -1 of the frame */
+        pp->wPicWidthInMBminus1 = s->mb_width  - 1;
+        pp->wPicHeightInMBminus1= s->mb_height - 1;
+    }
+    pp->bMacroblockWidthMinus1  = 15;
+    pp->bMacroblockHeightMinus1 = 15;
+    pp->bBlockWidthMinus1       = 7;
+    pp->bBlockHeightMinus1      = 7;
+    pp->bBPPminus1              = 7;
+    if (s->picture_structure & PICT_TOP_FIELD)
+        pp->bPicStructure      |= 0x01;
+    if (s->picture_structure & PICT_BOTTOM_FIELD)
+        pp->bPicStructure      |= 0x02;
+    pp->bSecondField            = v->interlace && v->fcm != 0x03 && !s->first_field;
+    pp->bPicIntra               = s->pict_type == FF_I_TYPE;
+    pp->bPicBackwardPrediction  = s->pict_type == FF_B_TYPE;
+    pp->bBidirectionalAveragingMode = (1                                           << 7) |
+                                      ((ctx->cfg->ConfigIntraResidUnsigned != 0)   << 6) |
+                                      ((ctx->cfg->ConfigResidDiffAccelerator != 0) << 5) |
+                                      ((v->lumscale != 32 || v->lumshift != 0)     << 4) |
+                                      ((v->profile == PROFILE_ADVANCED)            << 3);
+    pp->bMVprecisionAndChromaRelation = ((v->mv_mode == MV_PMODE_1MV_HPEL_BILIN) << 3) |
+                                        (1                                       << 2) |
+                                        (0                                       << 1) |
+                                        (!s->quarter_sample                          );
+    pp->bChromaFormat           = v->chromaformat;
+    ctx->report_id++;
+    if (ctx->report_id >= (1 << 16))
+        ctx->report_id = 1;
+    pp->bPicScanFixed           = ctx->report_id >> 8;
+    pp->bPicScanMethod          = ctx->report_id & 0xff;
+    pp->bPicReadbackRequests    = 0;
+    pp->bRcontrol               = v->rnd;
+    pp->bPicSpatialResid8       = (v->panscanflag  << 7) |
+                                  (v->refdist_flag << 6) |
+                                  (s->loop_filter  << 5) |
+                                  (v->fastuvmc     << 4) |
+                                  (v->extended_mv  << 3) |
+                                  (v->dquant       << 1) |
+                                  (v->vstransform      );
+    pp->bPicOverflowBlocks      = (v->quantizer_mode << 6) |
+                                  (v->multires       << 5) |
+                                  (s->resync_marker  << 4) |
+                                  (v->rangered       << 3) |
+                                  (s->max_b_frames       );
+    pp->bPicExtrapolation       = (!v->interlace || v->fcm == 0x00) ? 1 : 2;
+    pp->bPicDeblocked           = ((v->profile != PROFILE_ADVANCED && v->rangeredfrm) << 5) |
+                                  (s->loop_filter                                     << 1);
+    pp->bPicDeblockConfined     = (v->postprocflag             << 7) |
+                                  (v->broadcast                << 6) |
+                                  (v->interlace                << 5) |
+                                  (v->tfcntrflag               << 4) |
+                                  (v->finterpflag              << 3) |
+                                  ((s->pict_type != FF_B_TYPE) << 2) |
+                                  (v->psf                      << 1) |
+                                  (v->extended_dmv                 );
+    if (s->pict_type != FF_I_TYPE)
+        pp->bPic4MVallowed      = v->mv_mode == MV_PMODE_MIXED_MV ||
+                                  (v->mv_mode == MV_PMODE_INTENSITY_COMP &&
+                                   v->mv_mode2 == MV_PMODE_MIXED_MV);
+    if (v->profile == PROFILE_ADVANCED)
+        pp->bPicOBMC            = (v->range_mapy_flag  << 7) |
+                                  (v->range_mapy       << 4) |
+                                  (v->range_mapuv_flag << 3) |
+                                  (v->range_mapuv          );
+    pp->bPicBinPB               = 0;
+    pp->bMV_RPS                 = 0;
+    pp->bReservedBits           = 0;
+    if (s->picture_structure == PICT_FRAME) {
+        pp->wBitstreamFcodes        = v->lumscale;
+        pp->wBitstreamPCEelements   = v->lumshift;
+    } else {
+        /* Syntax: (top_field_param << 8) | bottom_field_param */
+        pp->wBitstreamFcodes        = (v->lumscale << 8) | v->lumscale;
+        pp->wBitstreamPCEelements   = (v->lumshift << 8) | v->lumshift;
+    }
+    pp->bBitstreamConcealmentNeed   = 0;
+    pp->bBitstreamConcealmentMethod = 0;
+}
+
+static void fill_slice(AVCodecContext *avctx, DXVA_SliceInfo *slice,
+                       unsigned position, unsigned size)
+{
+    const VC1Context *v = avctx->priv_data;
+    const MpegEncContext *s = &v->s;
+
+    memset(slice, 0, sizeof(*slice));
+    slice->wHorizontalPosition = 0;
+    slice->wVerticalPosition   = s->mb_y;
+    slice->dwSliceBitsInBuffer = 8 * size;
+    slice->dwSliceDataLocation = position;
+    slice->bStartCodeBitOffset = 0;
+    slice->bReservedBits       = 0;
+    slice->wMBbitOffset        = get_bits_count(&s->gb);
+    slice->wNumberMBsInSlice   = s->mb_width * s->mb_height; /* XXX We assume 1 slice */
+    slice->wQuantizerScaleCode = v->pq;
+    slice->wBadSliceChopping   = 0;
+}
+
+static int commit_bitstream_and_slice_buffer(AVCodecContext *avctx,
+                                             DXVA2_DecodeBufferDesc *bs,
+                                             DXVA2_DecodeBufferDesc *sc)
+{
+    const VC1Context *v = avctx->priv_data;
+    struct dxva_context *ctx = avctx->hwaccel_context;
+    const MpegEncContext *s = &v->s;
+    struct dxva2_picture_context *ctx_pic = s->current_picture_ptr->hwaccel_picture_private;
+
+    DXVA_SliceInfo *slice = &ctx_pic->si;
+
+    static const uint8_t start_code[] = { 0, 0, 1, 0x0d };
+    const unsigned start_code_size = avctx->codec_id == CODEC_ID_VC1 ? sizeof(start_code) : 0;
+    const unsigned slice_size = slice->dwSliceBitsInBuffer / 8;
+    const unsigned padding = 128 - ((start_code_size + slice_size) & 127);
+    const unsigned data_size = start_code_size + slice_size + padding;
+
+    uint8_t  *dxva_data;
+    unsigned dxva_size;
+    int result;
+
+    if (FAILED(IDirectXVideoDecoder_GetBuffer(ctx->decoder,
+                                              DXVA2_BitStreamDateBufferType,
+                                              &dxva_data, &dxva_size)))
+        return -1;
+
+    result = data_size <= dxva_size ? 0 : -1;
+    if (!result) {
+        if (start_code_size > 0)
+            memcpy(dxva_data, start_code, start_code_size);
+        memcpy(dxva_data + start_code_size,
+               ctx_pic->bitstream + slice->dwSliceDataLocation, slice_size);
+        if (padding > 0)
+            memset(dxva_data + start_code_size + slice_size, 0, padding);
+        slice->dwSliceBitsInBuffer = 8 * data_size;
+    }
+    if (FAILED(IDirectXVideoDecoder_ReleaseBuffer(ctx->decoder,
+                                                  DXVA2_BitStreamDateBufferType)))
+        return -1;
+    if (result)
+        return result;
+
+    memset(bs, 0, sizeof(*bs));
+    bs->CompressedBufferType = DXVA2_BitStreamDateBufferType;
+    bs->DataSize             = data_size;
+    bs->NumMBsInBuffer       = s->mb_width * s->mb_height;
+    assert((bs->DataSize & 127) == 0);
+
+    return ff_dxva2_commit_buffer(avctx, ctx, sc,
+                                  DXVA2_SliceControlBufferType,
+                                  slice, sizeof(*slice), bs->NumMBsInBuffer);
+}
+
+static int start_frame(AVCodecContext *avctx,
+                       av_unused const uint8_t *buffer,
+                       av_unused uint32_t size)
+{
+    const VC1Context *v = avctx->priv_data;
+    struct dxva_context *ctx = avctx->hwaccel_context;
+    struct dxva2_picture_context *ctx_pic = v->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, v, &ctx_pic->pp);
+
+    ctx_pic->bitstream_size = 0;
+    ctx_pic->bitstream      = NULL;
+    return 0;
+}
+
+static int decode_slice(AVCodecContext *avctx,
+                        const uint8_t *buffer, uint32_t size)
+{
+    const VC1Context *v = avctx->priv_data;
+    const Picture *current_picture = v->s.current_picture_ptr;
+    struct dxva2_picture_context *ctx_pic = current_picture->hwaccel_picture_private;
+
+    if (ctx_pic->bitstream_size > 0)
+        return -1;
+
+    if (avctx->codec_id == CODEC_ID_VC1 &&
+        size >= 4 && IS_MARKER(AV_RB32(buffer))) {
+        buffer += 4;
+        size   -= 4;
+    }
+
+    ctx_pic->bitstream_size = size;
+    ctx_pic->bitstream      = buffer;
+
+    fill_slice(avctx, &ctx_pic->si, 0, size);
+    return 0;
+}
+
+static int end_frame(AVCodecContext *avctx)
+{
+    VC1Context *v = avctx->priv_data;
+    struct dxva2_picture_context *ctx_pic = v->s.current_picture_ptr->hwaccel_picture_private;
+
+    if (ctx_pic->bitstream_size <= 0)
+        return -1;
+
+    return ff_dxva2_common_end_frame(avctx, &v->s,
+                                     &ctx_pic->pp, sizeof(ctx_pic->pp),
+                                     NULL, 0,
+                                     commit_bitstream_and_slice_buffer);
+}
+
+#if CONFIG_WMV3_DXVA2_HWACCEL
+AVHWAccel wmv3_dxva2_hwaccel = {
+    .name           = "wmv3_dxva2",
+    .type           = CODEC_TYPE_VIDEO,
+    .id             = CODEC_ID_WMV3,
+    .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),
+};
+#endif
+
+AVHWAccel vc1_dxva2_hwaccel = {
+    .name           = "vc1_dxva2",
+    .type           = CODEC_TYPE_VIDEO,
+    .id             = CODEC_ID_VC1,
+    .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),
+};
+