vdpau: Add H.264 decoding via hwaccel infrastructure

Signed-off-by: Diego Biurrun <diego@biurrun.de>

1 files changed, 196 insertions, 0 deletions

diff --git a/libavcodec/vdpau_h264.c b/libavcodec/vdpau_h264.c
new file mode 100644
index 0000000000..09b7ad5212
--- /dev/null
+++ b/libavcodec/vdpau_h264.c
@@ -0,0 +1,196 @@
+/*
+ * 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 "h264.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, Picture *pic,
+                              int pic_structure)
+{
+    VdpVideoSurface surface = ff_vdpau_get_surface_id(pic);
+
+    if (pic_structure == 0)
+        pic_structure = pic->f.reference;
+
+    rf->surface             = surface;
+    rf->is_long_term        = pic->f.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;
+    AVVDPAUContext *hwctx = avctx->hwaccel_context;
+    VdpPictureInfoH264 *info = &hwctx->info.h264;
+    int list;
+
+    VdpReferenceFrameH264 *rf = &info->referenceFrames[0];
+#define H264_RF_COUNT FF_ARRAY_ELEMS(info->referenceFrames)
+
+    for (list = 0; list < 2; ++list) {
+        Picture **lp = list ? h->long_ref : h->short_ref;
+        int i, ls    = list ? 16          : h->short_ref_count;
+
+        for (i = 0; i < ls; ++i) {
+            Picture *pic = lp[i];
+            VdpReferenceFrameH264 *rf2;
+            VdpVideoSurface surface_ref;
+            int pic_frame_idx;
+
+            if (!pic || !pic->f.reference)
+                continue;
+            pic_frame_idx = pic->long_ref ? pic->pic_id : pic->frame_num;
+            surface_ref = ff_vdpau_get_surface_id(pic);
+
+            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->f.reference & PICT_TOP_FIELD)    ? VDP_TRUE : VDP_FALSE;
+                rf2->bottom_is_reference |= (pic->f.reference & PICT_BOTTOM_FIELD) ? VDP_TRUE : VDP_FALSE;
+                continue;
+            }
+
+            if (rf >= &info->referenceFrames[H264_RF_COUNT])
+                continue;
+
+            vdpau_h264_set_rf(rf, pic, pic->f.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;
+    AVVDPAUContext *hwctx = avctx->hwaccel_context;
+    MpegEncContext * const s = &h->s;
+    VdpPictureInfoH264 *info = &hwctx->info.h264;
+    Picture *pic = s->current_picture_ptr;
+
+    /* 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->frame_num;
+    info->field_pic_flag                         = s->picture_structure != PICT_FRAME;
+    info->bottom_field_flag                      = s->picture_structure == PICT_BOTTOM_FIELD;
+    info->num_ref_frames                         = h->sps.ref_frame_count;
+    info->mb_adaptive_frame_field_flag           = h->sps.mb_aff && !info->field_pic_flag;
+    info->constrained_intra_pred_flag            = h->pps.constrained_intra_pred;
+    info->weighted_pred_flag                     = h->pps.weighted_pred;
+    info->weighted_bipred_idc                    = h->pps.weighted_bipred_idc;
+    info->frame_mbs_only_flag                    = h->sps.frame_mbs_only_flag;
+    info->transform_8x8_mode_flag                = h->pps.transform_8x8_mode;
+    info->chroma_qp_index_offset                 = h->pps.chroma_qp_index_offset[0];
+    info->second_chroma_qp_index_offset          = h->pps.chroma_qp_index_offset[1];
+    info->pic_init_qp_minus26                    = h->pps.init_qp - 26;
+    info->num_ref_idx_l0_active_minus1           = h->pps.ref_count[0] - 1;
+    info->num_ref_idx_l1_active_minus1           = h->pps.ref_count[1] - 1;
+    info->log2_max_frame_num_minus4              = h->sps.log2_max_frame_num - 4;
+    info->pic_order_cnt_type                     = h->sps.poc_type;
+    info->log2_max_pic_order_cnt_lsb_minus4      = h->sps.poc_type ? 0 : h->sps.log2_max_poc_lsb - 4;
+    info->delta_pic_order_always_zero_flag       = h->sps.delta_pic_order_always_zero_flag;
+    info->direct_8x8_inference_flag              = h->sps.direct_8x8_inference_flag;
+    info->entropy_coding_mode_flag               = h->pps.cabac;
+    info->pic_order_present_flag                 = h->pps.pic_order_present;
+    info->deblocking_filter_control_present_flag = h->pps.deblocking_filter_parameters_present;
+    info->redundant_pic_cnt_present_flag         = h->pps.redundant_pic_cnt_present;
+
+    memcpy(info->scaling_lists_4x4, h->pps.scaling_matrix4,
+           sizeof(info->scaling_lists_4x4));
+    memcpy(info->scaling_lists_8x8[0], h->pps.scaling_matrix8[0],
+           sizeof(info->scaling_lists_8x8[0]));
+    memcpy(info->scaling_lists_8x8[1], h->pps.scaling_matrix8[3],
+           sizeof(info->scaling_lists_8x8[1]));
+
+    vdpau_h264_set_reference_frames(avctx);
+
+    return ff_vdpau_common_start_frame(avctx, 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)
+{
+    AVVDPAUContext *hwctx = avctx->hwaccel_context;
+    int val;
+
+    val = ff_vdpau_add_buffer(avctx, start_code_prefix, 3);
+    if (val)
+        return val;
+
+    val = ff_vdpau_add_buffer(avctx, buffer, size);
+    if (val)
+        return val;
+
+    hwctx->info.h264.slice_count++;
+    return 0;
+}
+
+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      = ff_vdpau_common_end_frame,
+    .decode_slice   = vdpau_h264_decode_slice,
+};