avconv: add support for DXVA2 decoding

Signed-off-by: Anton Khirnov <anton@khirnov.net>

1 files changed, 618 insertions, 0 deletions

diff --git a/avconv_dxva2.c b/avconv_dxva2.c
new file mode 100644
index 0000000000..95321dd398
--- /dev/null
+++ b/avconv_dxva2.c
@@ -0,0 +1,618 @@
+/*
+ * 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 <windows.h>
+
+#ifdef _WIN32_WINNT
+#undef _WIN32_WINNT
+#endif
+#define _WIN32_WINNT 0x0600
+#define DXVA2API_USE_BITFIELDS
+#define COBJMACROS
+
+#include <stdint.h>
+
+/* initguid.h needs to be above d3d/dxva to ensure
+   the GUIDs are initialized properly */
+#include <initguid.h>
+
+#include <d3d9.h>
+#include <dxva2api.h>
+
+#include "avconv.h"
+
+#include "libavcodec/dxva2.h"
+
+#include "libavutil/avassert.h"
+#include "libavutil/buffer.h"
+#include "libavutil/frame.h"
+#include "libavutil/imgutils.h"
+#include "libavutil/pixfmt.h"
+
+typedef IDirect3D9* WINAPI pDirect3DCreate9(UINT);
+typedef HRESULT WINAPI pCreateDeviceManager9(UINT *, IDirect3DDeviceManager9 **);
+
+/* GUIDs not defined in the common dxva2api.h in mingw-w64 */
+#ifndef _MSC_VER
+DEFINE_GUID(DXVA2_ModeMPEG2and1_VLD, 0x86695f12, 0x340e,0x4f04,0x9f,0xd3,0x92,0x53,0xdd,0x32,0x74,0x60);
+DEFINE_GUID(DXVA2_ModeVC1_D2010,     0x1b81beA4, 0xa0c7,0x11d3,0xb9,0x84,0x00,0xc0,0x4f,0x2e,0x73,0xc5);
+DEFINE_GUID(DXVA2_NoEncrypt,         0x1b81beD0, 0xa0c7,0x11d3,0xb9,0x84,0x00,0xc0,0x4f,0x2e,0x73,0xc5);
+#endif
+
+DEFINE_GUID(DXVADDI_Intel_ModeH264_E, 0x604F8E68, 0x4951,0x4C54,0x88,0xFE,0xAB,0xD2,0x5C,0x15,0xB3,0xD6);
+DEFINE_GUID(GUID_NULL,                0x00000000, 0x0000,0x0000,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00);
+
+typedef struct dxva2_mode {
+  const GUID     *guid;
+  enum AVCodecID codec;
+} dxva2_mode;
+
+static const dxva2_mode dxva2_modes[] = {
+    /* MPEG-2 */
+    { &DXVA2_ModeMPEG2_VLD,      AV_CODEC_ID_MPEG2VIDEO },
+    { &DXVA2_ModeMPEG2and1_VLD,  AV_CODEC_ID_MPEG2VIDEO },
+
+    /* H.264 */
+    { &DXVA2_ModeH264_F,         AV_CODEC_ID_H264 },
+    { &DXVA2_ModeH264_E,         AV_CODEC_ID_H264 },
+    /* Intel specific H.264 mode */
+    { &DXVADDI_Intel_ModeH264_E, AV_CODEC_ID_H264 },
+
+    /* VC-1 / WMV3 */
+    { &DXVA2_ModeVC1_D2010,      AV_CODEC_ID_VC1  },
+    { &DXVA2_ModeVC1_D2010,      AV_CODEC_ID_WMV3 },
+    { &DXVA2_ModeVC1_D,          AV_CODEC_ID_VC1  },
+    { &DXVA2_ModeVC1_D,          AV_CODEC_ID_WMV3 },
+
+    { NULL,                      0 },
+};
+
+typedef struct surface_info {
+    int used;
+    uint64_t age;
+} surface_info;
+
+typedef struct DXVA2Context {
+    HMODULE d3dlib;
+    HMODULE dxva2lib;
+
+    HANDLE  deviceHandle;
+
+    IDirect3D9                  *d3d9;
+    IDirect3DDevice9            *d3d9device;
+    IDirect3DDeviceManager9     *d3d9devmgr;
+    IDirectXVideoDecoderService *decoder_service;
+    IDirectXVideoDecoder        *decoder;
+
+    GUID                        decoder_guid;
+    DXVA2_ConfigPictureDecode   decoder_config;
+
+    LPDIRECT3DSURFACE9          *surfaces;
+    surface_info                *surface_infos;
+    uint32_t                    num_surfaces;
+    uint64_t                    surface_age;
+
+    AVFrame                     *tmp_frame;
+} DXVA2Context;
+
+typedef struct DXVA2SurfaceWrapper {
+    DXVA2Context         *ctx;
+    LPDIRECT3DSURFACE9   surface;
+    IDirectXVideoDecoder *decoder;
+} DXVA2SurfaceWrapper;
+
+static void dxva2_destroy_decoder(AVCodecContext *s)
+{
+    InputStream  *ist = s->opaque;
+    DXVA2Context *ctx = ist->hwaccel_ctx;
+
+    if (ctx->surfaces) {
+        for (int i = 0; i < ctx->num_surfaces; i++) {
+            if (ctx->surfaces[i])
+                IDirect3DSurface9_Release(ctx->surfaces[i]);
+        }
+    }
+    av_freep(&ctx->surfaces);
+    av_freep(&ctx->surface_infos);
+    ctx->num_surfaces = 0;
+    ctx->surface_age  = 0;
+
+    if (ctx->decoder) {
+        IDirectXVideoDecoder_Release(ctx->decoder);
+        ctx->decoder = NULL;
+    }
+}
+
+static void dxva2_uninit(AVCodecContext *s)
+{
+    InputStream  *ist = s->opaque;
+    DXVA2Context *ctx = ist->hwaccel_ctx;
+
+    ist->hwaccel_uninit        = NULL;
+    ist->hwaccel_get_buffer    = NULL;
+    ist->hwaccel_retrieve_data = NULL;
+
+    if (ctx->decoder)
+        dxva2_destroy_decoder(s);
+
+    if (ctx->decoder_service)
+        IDirectXVideoDecoderService_Release(ctx->decoder_service);
+
+    if (ctx->d3d9devmgr && ctx->deviceHandle != INVALID_HANDLE_VALUE)
+        IDirect3DDeviceManager9_CloseDeviceHandle(ctx->d3d9devmgr, ctx->deviceHandle);
+
+    if (ctx->d3d9devmgr)
+        IDirect3DDeviceManager9_Release(ctx->d3d9devmgr);
+
+    if (ctx->d3d9device)
+        IDirect3DDevice9_Release(ctx->d3d9device);
+
+    if (ctx->d3d9)
+        IDirect3D9_Release(ctx->d3d9);
+
+    if (ctx->d3dlib)
+        FreeLibrary(ctx->d3dlib);
+
+    if (ctx->dxva2lib)
+        FreeLibrary(ctx->dxva2lib);
+
+    av_frame_free(&ctx->tmp_frame);
+
+    av_freep(&ist->hwaccel_ctx);
+    av_freep(&s->hwaccel_context);
+}
+
+static void dxva2_release_buffer(void *opaque, uint8_t *data)
+{
+    DXVA2SurfaceWrapper *w   = opaque;
+    DXVA2Context        *ctx = w->ctx;
+    int i;
+
+    for (i = 0; i < ctx->num_surfaces; i++) {
+        if (ctx->surfaces[i] == w->surface) {
+            ctx->surface_infos[i].used = 0;
+            break;
+        }
+    }
+    IDirect3DSurface9_Release(w->surface);
+    IDirectXVideoDecoder_Release(w->decoder);
+    av_free(w);
+}
+
+static int dxva2_get_buffer(AVCodecContext *s, AVFrame *frame, int flags)
+{
+    InputStream  *ist = s->opaque;
+    DXVA2Context *ctx = ist->hwaccel_ctx;
+    int i, old_unused = -1;
+    LPDIRECT3DSURFACE9 surface;
+    DXVA2SurfaceWrapper *w = NULL;
+
+    av_assert0(frame->format == AV_PIX_FMT_DXVA2_VLD);
+
+    for (i = 0; i < ctx->num_surfaces; i++) {
+        surface_info *info = &ctx->surface_infos[i];
+        if (!info->used && (old_unused == -1 || info->age < ctx->surface_infos[old_unused].age))
+            old_unused = i;
+    }
+    if (old_unused == -1) {
+        av_log(NULL, AV_LOG_ERROR, "No free DXVA2 surface!\n");
+        return AVERROR(ENOMEM);
+    }
+    i = old_unused;
+
+    surface = ctx->surfaces[i];
+
+    w = av_mallocz(sizeof(*w));
+    if (!w)
+        return AVERROR(ENOMEM);
+
+    frame->buf[0] = av_buffer_create((uint8_t*)surface, 0,
+                                     dxva2_release_buffer, w,
+                                     AV_BUFFER_FLAG_READONLY);
+    if (!frame->buf[0]) {
+        av_free(w);
+        return AVERROR(ENOMEM);
+    }
+
+    w->ctx     = ctx;
+    w->surface = surface;
+    IDirect3DSurface9_AddRef(w->surface);
+    w->decoder = ctx->decoder;
+    IDirectXVideoDecoder_AddRef(w->decoder);
+
+    ctx->surface_infos[i].used = 1;
+    ctx->surface_infos[i].age  = ctx->surface_age++;
+
+    frame->data[3] = (uint8_t *)surface;
+
+    return 0;
+}
+
+static int dxva2_retrieve_data(AVCodecContext *s, AVFrame *frame)
+{
+    LPDIRECT3DSURFACE9 surface =  (LPDIRECT3DSURFACE9)frame->data[3];
+    InputStream        *ist = s->opaque;
+    DXVA2Context       *ctx = ist->hwaccel_ctx;
+    D3DSURFACE_DESC    surfaceDesc;
+    D3DLOCKED_RECT     LockedRect;
+    HRESULT            hr;
+    int                ret;
+
+    IDirect3DSurface9_GetDesc(surface, &surfaceDesc);
+
+    ctx->tmp_frame->width  = frame->width;
+    ctx->tmp_frame->height = frame->height;
+    ctx->tmp_frame->format = AV_PIX_FMT_NV12;
+
+    ret = av_frame_get_buffer(ctx->tmp_frame, 32);
+    if (ret < 0)
+        return ret;
+
+    hr = IDirect3DSurface9_LockRect(surface, &LockedRect, NULL, D3DLOCK_READONLY);
+    if (FAILED(hr)) {
+        av_log(NULL, AV_LOG_ERROR, "Unable to lock DXVA2 surface\n");
+        return AVERROR_UNKNOWN;
+    }
+
+    av_image_copy_plane(ctx->tmp_frame->data[0], ctx->tmp_frame->linesize[0],
+                        (uint8_t*)LockedRect.pBits,
+                        LockedRect.Pitch, frame->width, frame->height);
+
+    av_image_copy_plane(ctx->tmp_frame->data[1], ctx->tmp_frame->linesize[1],
+                        (uint8_t*)LockedRect.pBits + LockedRect.Pitch * surfaceDesc.Height,
+                        LockedRect.Pitch, frame->width, frame->height / 2);
+
+    IDirect3DSurface9_UnlockRect(surface);
+
+    ret = av_frame_copy_props(ctx->tmp_frame, frame);
+    if (ret < 0)
+        goto fail;
+
+    av_frame_unref(frame);
+    av_frame_move_ref(frame, ctx->tmp_frame);
+
+    return 0;
+fail:
+    av_frame_unref(ctx->tmp_frame);
+    return ret;
+}
+
+static int dxva2_alloc(AVCodecContext *s)
+{
+    InputStream  *ist = s->opaque;
+    int loglevel = (ist->hwaccel_id == HWACCEL_AUTO) ? AV_LOG_VERBOSE : AV_LOG_ERROR;
+    DXVA2Context *ctx;
+    pDirect3DCreate9      *createD3D = NULL;
+    pCreateDeviceManager9 *createDeviceManager = NULL;
+    HRESULT hr;
+    D3DPRESENT_PARAMETERS d3dpp = {0};
+    D3DDISPLAYMODE        d3ddm;
+    unsigned resetToken = 0;
+    UINT adapter = D3DADAPTER_DEFAULT;
+
+    ctx = av_mallocz(sizeof(*ctx));
+    if (!ctx)
+        return AVERROR(ENOMEM);
+
+    ctx->deviceHandle = INVALID_HANDLE_VALUE;
+
+    ist->hwaccel_ctx           = ctx;
+    ist->hwaccel_uninit        = dxva2_uninit;
+    ist->hwaccel_get_buffer    = dxva2_get_buffer;
+    ist->hwaccel_retrieve_data = dxva2_retrieve_data;
+
+    ctx->d3dlib = LoadLibrary("d3d9.dll");
+    if (!ctx->d3dlib) {
+        av_log(NULL, loglevel, "Failed to load D3D9 library\n");
+        goto fail;
+    }
+    ctx->dxva2lib = LoadLibrary("dxva2.dll");
+    if (!ctx->dxva2lib) {
+        av_log(NULL, loglevel, "Failed to load DXVA2 library\n");
+        goto fail;
+    }
+
+    createD3D = (pDirect3DCreate9 *)GetProcAddress(ctx->d3dlib, "Direct3DCreate9");
+    if (!createD3D) {
+        av_log(NULL, loglevel, "Failed to locate Direct3DCreate9\n");
+        goto fail;
+    }
+    createDeviceManager = (pCreateDeviceManager9 *)GetProcAddress(ctx->dxva2lib, "DXVA2CreateDirect3DDeviceManager9");
+    if (!createDeviceManager) {
+        av_log(NULL, loglevel, "Failed to locate DXVA2CreateDirect3DDeviceManager9\n");
+        goto fail;
+    }
+
+    ctx->d3d9 = createD3D(D3D_SDK_VERSION);
+    if (!ctx->d3d9) {
+        av_log(NULL, loglevel, "Failed to create IDirect3D object\n");
+        goto fail;
+    }
+
+    if (ist->hwaccel_device) {
+        adapter = atoi(ist->hwaccel_device);
+        av_log(NULL, AV_LOG_INFO, "Using HWAccel device %d\n", adapter);
+    }
+
+    IDirect3D9_GetAdapterDisplayMode(ctx->d3d9, adapter, &d3ddm);
+    d3dpp.Windowed         = TRUE;
+    d3dpp.BackBufferWidth  = 640;
+    d3dpp.BackBufferHeight = 480;
+    d3dpp.BackBufferCount  = 0;
+    d3dpp.BackBufferFormat = d3ddm.Format;
+    d3dpp.SwapEffect       = D3DSWAPEFFECT_DISCARD;
+    d3dpp.Flags            = D3DPRESENTFLAG_VIDEO;
+
+    hr = IDirect3D9_CreateDevice(ctx->d3d9, adapter, D3DDEVTYPE_HAL, GetShellWindow(),
+                                 D3DCREATE_SOFTWARE_VERTEXPROCESSING | D3DCREATE_MULTITHREADED | D3DCREATE_FPU_PRESERVE,
+                                 &d3dpp, &ctx->d3d9device);
+    if (FAILED(hr)) {
+        av_log(NULL, loglevel, "Failed to create Direct3D device\n");
+        goto fail;
+    }
+
+    hr = createDeviceManager(&resetToken, &ctx->d3d9devmgr);
+    if (FAILED(hr)) {
+        av_log(NULL, loglevel, "Failed to create Direct3D device manager\n");
+        goto fail;
+    }
+
+    hr = IDirect3DDeviceManager9_ResetDevice(ctx->d3d9devmgr, ctx->d3d9device, resetToken);
+    if (FAILED(hr)) {
+        av_log(NULL, loglevel, "Failed to bind Direct3D device to device manager\n");
+        goto fail;
+    }
+
+    hr = IDirect3DDeviceManager9_OpenDeviceHandle(ctx->d3d9devmgr, &ctx->deviceHandle);
+    if (FAILED(hr)) {
+        av_log(NULL, loglevel, "Failed to open device handle\n");
+        goto fail;
+    }
+
+    hr = IDirect3DDeviceManager9_GetVideoService(ctx->d3d9devmgr, ctx->deviceHandle, &IID_IDirectXVideoDecoderService, (void **)&ctx->decoder_service);
+    if (FAILED(hr)) {
+        av_log(NULL, loglevel, "Failed to create IDirectXVideoDecoderService\n");
+        goto fail;
+    }
+
+    ctx->tmp_frame = av_frame_alloc();
+    if (!ctx->tmp_frame)
+        goto fail;
+
+    s->hwaccel_context = av_mallocz(sizeof(struct dxva_context));
+    if (!s->hwaccel_context)
+        goto fail;
+
+    return 0;
+fail:
+    dxva2_uninit(s);
+    return AVERROR(EINVAL);
+}
+
+static int dxva2_get_decoder_configuration(AVCodecContext *s, const GUID *device_guid,
+                                           const DXVA2_VideoDesc *desc,
+                                           DXVA2_ConfigPictureDecode *config)
+{
+    InputStream  *ist = s->opaque;
+    int loglevel = (ist->hwaccel_id == HWACCEL_AUTO) ? AV_LOG_VERBOSE : AV_LOG_ERROR;
+    DXVA2Context *ctx = ist->hwaccel_ctx;
+    unsigned cfg_count = 0, best_score = 0;
+    DXVA2_ConfigPictureDecode *cfg_list = NULL;
+    DXVA2_ConfigPictureDecode best_cfg = {{0}};
+    HRESULT hr;
+    int i;
+
+    hr = IDirectXVideoDecoderService_GetDecoderConfigurations(ctx->decoder_service, device_guid, desc, NULL, &cfg_count, &cfg_list);
+    if (FAILED(hr)) {
+        av_log(NULL, loglevel, "Unable to retrieve decoder configurations\n");
+        return AVERROR(EINVAL);
+    }
+
+    for (i = 0; i < cfg_count; i++) {
+        DXVA2_ConfigPictureDecode *cfg = &cfg_list[i];
+
+        unsigned score;
+        if (cfg->ConfigBitstreamRaw == 1)
+            score = 1;
+        else if (s->codec_id == AV_CODEC_ID_H264 && cfg->ConfigBitstreamRaw == 2)
+            score = 2;
+        else
+            continue;
+        if (IsEqualGUID(&cfg->guidConfigBitstreamEncryption, &DXVA2_NoEncrypt))
+            score += 16;
+        if (score > best_score) {
+            best_score = score;
+            best_cfg   = *cfg;
+        }
+    }
+    CoTaskMemFree(cfg_list);
+
+    if (!best_score) {
+        av_log(NULL, loglevel, "No valid decoder configuration available\n");
+        return AVERROR(EINVAL);
+    }
+
+    *config = best_cfg;
+    return 0;
+}
+
+static int dxva2_create_decoder(AVCodecContext *s)
+{
+    InputStream  *ist = s->opaque;
+    int loglevel = (ist->hwaccel_id == HWACCEL_AUTO) ? AV_LOG_VERBOSE : AV_LOG_ERROR;
+    DXVA2Context *ctx = ist->hwaccel_ctx;
+    struct dxva_context *dxva_ctx = s->hwaccel_context;
+    GUID *guid_list = NULL;
+    unsigned guid_count = 0, i, j;
+    GUID device_guid = GUID_NULL;
+    D3DFORMAT target_format = 0;
+    DXVA2_VideoDesc desc = { 0 };
+    DXVA2_ConfigPictureDecode config;
+    HRESULT hr;
+    int surface_alignment;
+    int ret;
+
+    hr = IDirectXVideoDecoderService_GetDecoderDeviceGuids(ctx->decoder_service, &guid_count, &guid_list);
+    if (FAILED(hr)) {
+        av_log(NULL, loglevel, "Failed to retrieve decoder device GUIDs\n");
+        goto fail;
+    }
+
+    for (i = 0; dxva2_modes[i].guid; i++) {
+        D3DFORMAT *target_list = NULL;
+        unsigned target_count = 0;
+        const dxva2_mode *mode = &dxva2_modes[i];
+        if (mode->codec != s->codec_id)
+            continue;
+
+        for (j = 0; j < guid_count; j++) {
+            if (IsEqualGUID(mode->guid, &guid_list[j]))
+                break;
+        }
+        if (j == guid_count)
+            continue;
+
+        hr = IDirectXVideoDecoderService_GetDecoderRenderTargets(ctx->decoder_service, mode->guid, &target_count, &target_list);
+        if (FAILED(hr)) {
+            continue;
+        }
+        for (j = 0; j < target_count; j++) {
+            const D3DFORMAT format = target_list[j];
+            if (format == MKTAG('N','V','1','2')) {
+                target_format = format;
+                break;
+            }
+        }
+        CoTaskMemFree(target_list);
+        if (target_format) {
+            device_guid = *mode->guid;
+            break;
+        }
+    }
+    CoTaskMemFree(guid_list);
+
+    if (IsEqualGUID(&device_guid, &GUID_NULL)) {
+        av_log(NULL, loglevel, "No decoder device for codec found\n");
+        goto fail;
+    }
+
+    desc.SampleWidth  = s->coded_width;
+    desc.SampleHeight = s->coded_height;
+    desc.Format       = target_format;
+
+    ret = dxva2_get_decoder_configuration(s, &device_guid, &desc, &config);
+    if (ret < 0) {
+        goto fail;
+    }
+
+    /* decoding MPEG-2 requires additional alignment on some Intel GPUs,
+       but it causes issues for H.264 on certain AMD GPUs..... */
+    if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO)
+        surface_alignment = 32;
+    else
+        surface_alignment = 16;
+
+    /* 4 base work surfaces */
+    ctx->num_surfaces = 4;
+
+    /* add surfaces based on number of possible refs */
+    if (s->codec_id == AV_CODEC_ID_H264)
+        ctx->num_surfaces += 16;
+    else
+        ctx->num_surfaces += 2;
+
+    /* add extra surfaces for frame threading */
+    if (s->active_thread_type & FF_THREAD_FRAME)
+        ctx->num_surfaces += s->thread_count;
+
+    ctx->surfaces      = av_mallocz(ctx->num_surfaces * sizeof(*ctx->surfaces));
+    ctx->surface_infos = av_mallocz(ctx->num_surfaces * sizeof(*ctx->surface_infos));
+
+    if (!ctx->surfaces || !ctx->surface_infos) {
+        av_log(NULL, loglevel, "Unable to allocate surface arrays\n");
+        goto fail;
+    }
+
+    hr = IDirectXVideoDecoderService_CreateSurface(ctx->decoder_service,
+                                                   FFALIGN(s->coded_width, surface_alignment),
+                                                   FFALIGN(s->coded_height, surface_alignment),
+                                                   ctx->num_surfaces - 1,
+                                                   target_format, D3DPOOL_DEFAULT, 0,
+                                                   DXVA2_VideoDecoderRenderTarget,
+                                                   ctx->surfaces, NULL);
+    if (FAILED(hr)) {
+        av_log(NULL, loglevel, "Failed to create %d video surfaces\n", ctx->num_surfaces);
+        goto fail;
+    }
+
+    hr = IDirectXVideoDecoderService_CreateVideoDecoder(ctx->decoder_service, &device_guid,
+                                                        &desc, &config, ctx->surfaces,
+                                                        ctx->num_surfaces, &ctx->decoder);
+    if (FAILED(hr)) {
+        av_log(NULL, loglevel, "Failed to create DXVA2 video decoder\n");
+        goto fail;
+    }
+
+    ctx->decoder_guid   = device_guid;
+    ctx->decoder_config = config;
+
+    dxva_ctx->cfg           = &ctx->decoder_config;
+    dxva_ctx->decoder       = ctx->decoder;
+    dxva_ctx->surface       = ctx->surfaces;
+    dxva_ctx->surface_count = ctx->num_surfaces;
+
+    if (IsEqualGUID(&ctx->decoder_guid, &DXVADDI_Intel_ModeH264_E))
+        dxva_ctx->workaround |= FF_DXVA2_WORKAROUND_INTEL_CLEARVIDEO;
+
+    return 0;
+fail:
+    dxva2_destroy_decoder(s);
+    return AVERROR(EINVAL);
+}
+
+int dxva2_init(AVCodecContext *s)
+{
+    InputStream *ist = s->opaque;
+    int loglevel = (ist->hwaccel_id == HWACCEL_AUTO) ? AV_LOG_VERBOSE : AV_LOG_ERROR;
+    DXVA2Context *ctx;
+    int ret;
+
+    if (!ist->hwaccel_ctx) {
+        ret = dxva2_alloc(s);
+        if (ret < 0)
+            return ret;
+    }
+    ctx = ist->hwaccel_ctx;
+
+    if (s->codec_id == AV_CODEC_ID_H264 &&
+        (s->profile & ~FF_PROFILE_H264_CONSTRAINED) > FF_PROFILE_H264_HIGH) {
+        av_log(NULL, loglevel, "Unsupported H.264 profile for DXVA2 HWAccel: %d\n", s->profile);
+        return AVERROR(EINVAL);
+    }
+
+    if (ctx->decoder)
+        dxva2_destroy_decoder(s);
+
+    ret = dxva2_create_decoder(s);
+    if (ret < 0) {
+        av_log(NULL, loglevel, "Error creating the DXVA2 decoder\n");
+        return ret;
+    }
+
+    return 0;
+}