lavc/qsvdec: Add GPU-accelerated memory copy support

GPU copy enables or disables GPU accelerated copying between video
and system memory. This may lead to a notable performance improvement.
Memory must be sequent and aligned with 128x64.

CMD:
ffmpeg -init_hw_device qsv=hw -filter_hw_device hw -c:v h264_qsv
                    -gpu_copy on -i input.h264 -f null -
or:
ffmpeg -c:v h264_qsv -gpu_copy on -i input.h264 -f null -

Signed-off-by: Linjie Fu <linjie.fu@intel.com>
Signed-off-by: ChaoX A Liu <chaox.a.liu@intel.com>
Signed-off-by: Zhong Li <zhong.li@intel.com>

7 files changed, 104 insertions, 19 deletions

diff --git a/libavcodec/qsv.c b/libavcodec/qsv.c
index 81fa4a82ef..b00e427435 100644
--- a/libavcodec/qsv.c
+++ b/libavcodec/qsv.c
@@ -412,15 +412,21 @@ static int ff_qsv_set_display_handle(AVCodecContext *avctx, QSVSession *qs)
 #endif //AVCODEC_QSV_LINUX_SESSION_HANDLE
 
 int ff_qsv_init_internal_session(AVCodecContext *avctx, QSVSession *qs,
-                                 const char *load_plugins)
+                                 const char *load_plugins, int gpu_copy)
 {
-    mfxIMPL impl   = MFX_IMPL_AUTO_ANY;
-    mfxVersion ver = { { QSV_VERSION_MINOR, QSV_VERSION_MAJOR } };
+    mfxIMPL          impl = MFX_IMPL_AUTO_ANY;
+    mfxVersion        ver = { { QSV_VERSION_MINOR, QSV_VERSION_MAJOR } };
+    mfxInitParam init_par = { MFX_IMPL_AUTO_ANY };
 
     const char *desc;
     int ret;
 
-    ret = MFXInit(impl, &ver, &qs->session);
+#if QSV_VERSION_ATLEAST(1, 16)
+    init_par.GPUCopy        = gpu_copy;
+#endif
+    init_par.Implementation = impl;
+    init_par.Version        = ver;
+    ret = MFXInitEx(init_par, &qs->session);
     if (ret < 0)
         return ff_qsv_print_error(avctx, ret,
                                   "Error initializing an internal MFX session");
@@ -712,7 +718,8 @@ static mfxStatus qsv_frame_get_hdl(mfxHDL pthis, mfxMemId mid, mfxHDL *hdl)
 }
 
 int ff_qsv_init_session_device(AVCodecContext *avctx, mfxSession *psession,
-                               AVBufferRef *device_ref, const char *load_plugins)
+                               AVBufferRef *device_ref, const char *load_plugins,
+                               int gpu_copy)
 {
     static const mfxHandleType handle_types[] = {
         MFX_HANDLE_VA_DISPLAY,
@@ -722,11 +729,12 @@ int ff_qsv_init_session_device(AVCodecContext *avctx, mfxSession *psession,
     AVHWDeviceContext    *device_ctx = (AVHWDeviceContext*)device_ref->data;
     AVQSVDeviceContext *device_hwctx = device_ctx->hwctx;
     mfxSession        parent_session = device_hwctx->session;
+    mfxInitParam            init_par = { MFX_IMPL_AUTO_ANY };
+    mfxHDL                    handle = NULL;
 
     mfxSession    session;
     mfxVersion    ver;
     mfxIMPL       impl;
-    mfxHDL        handle = NULL;
     mfxHandleType handle_type;
     mfxStatus err;
 
@@ -752,7 +760,12 @@ int ff_qsv_init_session_device(AVCodecContext *avctx, mfxSession *psession,
                "from the session\n");
     }
 
-    err = MFXInit(impl, &ver, &session);
+#if QSV_VERSION_ATLEAST(1, 16)
+    init_par.GPUCopy        = gpu_copy;
+#endif
+    init_par.Implementation = impl;
+    init_par.Version        = ver;
+    err = MFXInitEx(init_par, &session);
     if (err != MFX_ERR_NONE)
         return ff_qsv_print_error(avctx, err,
                                   "Error initializing a child MFX session");
@@ -783,7 +796,7 @@ int ff_qsv_init_session_device(AVCodecContext *avctx, mfxSession *psession,
 
 int ff_qsv_init_session_frames(AVCodecContext *avctx, mfxSession *psession,
                                QSVFramesContext *qsv_frames_ctx,
-                               const char *load_plugins, int opaque)
+                               const char *load_plugins, int opaque, int gpu_copy)
 {
     mfxFrameAllocator frame_allocator = {
         .pthis  = qsv_frames_ctx,
@@ -803,7 +816,7 @@ int ff_qsv_init_session_frames(AVCodecContext *avctx, mfxSession *psession,
     int ret;
 
     ret = ff_qsv_init_session_device(avctx, &session,
-                                     frames_ctx->device_ref, load_plugins);
+                                     frames_ctx->device_ref, load_plugins, gpu_copy);
     if (ret < 0)
         return ret;
 
diff --git a/libavcodec/qsv_internal.h b/libavcodec/qsv_internal.h
index 8b44a9b6f4..37559270e5 100644
--- a/libavcodec/qsv_internal.h
+++ b/libavcodec/qsv_internal.h
@@ -127,16 +127,17 @@ enum AVPictureType ff_qsv_map_pictype(int mfx_pic_type);
 enum AVFieldOrder ff_qsv_map_picstruct(int mfx_pic_struct);
 
 int ff_qsv_init_internal_session(AVCodecContext *avctx, QSVSession *qs,
-                                 const char *load_plugins);
+                                 const char *load_plugins, int gpu_copy);
 
 int ff_qsv_close_internal_session(QSVSession *qs);
 
 int ff_qsv_init_session_device(AVCodecContext *avctx, mfxSession *psession,
-                               AVBufferRef *device_ref, const char *load_plugins);
+                               AVBufferRef *device_ref, const char *load_plugins,
+                               int gpu_copy);
 
 int ff_qsv_init_session_frames(AVCodecContext *avctx, mfxSession *session,
                                QSVFramesContext *qsv_frames_ctx,
-                               const char *load_plugins, int opaque);
+                               const char *load_plugins, int opaque, int gpu_copy);
 
 int ff_qsv_find_surface_idx(QSVFramesContext *ctx, QSVFrame *frame);
 
diff --git a/libavcodec/qsvdec.c b/libavcodec/qsvdec.c
index 9299596e33..ae5023989c 100644
--- a/libavcodec/qsvdec.c
+++ b/libavcodec/qsvdec.c
@@ -34,9 +34,11 @@
 #include "libavutil/pixdesc.h"
 #include "libavutil/pixfmt.h"
 #include "libavutil/time.h"
+#include "libavutil/imgutils.h"
 
 #include "avcodec.h"
 #include "internal.h"
+#include "decode.h"
 #include "qsv.h"
 #include "qsv_internal.h"
 #include "qsvdec.h"
@@ -54,11 +56,52 @@ const AVCodecHWConfigInternal *ff_qsv_hw_configs[] = {
     NULL
 };
 
+static int ff_qsv_get_continuous_buffer(AVCodecContext *avctx, AVFrame *frame, AVBufferPool *pool)
+{
+    int ret = 0;
+
+    ff_decode_frame_props(avctx, frame);
+
+    frame->width       = avctx->width;
+    frame->height      = avctx->height;
+
+    switch (avctx->pix_fmt) {
+    case AV_PIX_FMT_NV12:
+        frame->linesize[0] = FFALIGN(avctx->width, 128);
+        break;
+    case AV_PIX_FMT_P010:
+        frame->linesize[0] = 2 * FFALIGN(avctx->width, 128);
+        break;
+    default:
+        av_log(avctx, AV_LOG_ERROR, "Unsupported pixel format.\n");
+        return AVERROR(ENOMEM);
+    }
+
+    frame->linesize[1] = frame->linesize[0];
+    frame->buf[0]      = av_buffer_pool_get(pool);
+    if (!frame->buf[0])
+        return AVERROR(ENOMEM);
+
+    frame->data[0] = frame->buf[0]->data;
+    frame->data[1] = frame->data[0] +
+                            frame->linesize[0] * FFALIGN(avctx->height, 64);
+
+    ret = ff_attach_decode_data(frame);
+    if (ret < 0)
+        return ret;
+
+    return 0;
+}
+
 static int qsv_init_session(AVCodecContext *avctx, QSVContext *q, mfxSession session,
                             AVBufferRef *hw_frames_ref, AVBufferRef *hw_device_ref)
 {
     int ret;
 
+    if (q->gpu_copy == MFX_GPUCOPY_ON &&
+        !(q->iopattern & MFX_IOPATTERN_OUT_SYSTEM_MEMORY))
+        av_log(avctx, AV_LOG_WARNING, "GPU-accelerated memory copy "
+                        "only works in MFX_IOPATTERN_OUT_SYSTEM_MEMORY.\n");
     if (session) {
         q->session = session;
     } else if (hw_frames_ref) {
@@ -74,7 +117,8 @@ static int qsv_init_session(AVCodecContext *avctx, QSVContext *q, mfxSession ses
 
         ret = ff_qsv_init_session_frames(avctx, &q->internal_qs.session,
                                          &q->frames_ctx, q->load_plugins,
-                                         q->iopattern == MFX_IOPATTERN_OUT_OPAQUE_MEMORY);
+                                         q->iopattern == MFX_IOPATTERN_OUT_OPAQUE_MEMORY,
+                                         q->gpu_copy);
         if (ret < 0) {
             av_buffer_unref(&q->frames_ctx.hw_frames_ctx);
             return ret;
@@ -88,7 +132,7 @@ static int qsv_init_session(AVCodecContext *avctx, QSVContext *q, mfxSession ses
         }
 
         ret = ff_qsv_init_session_device(avctx, &q->internal_qs.session,
-                                         hw_device_ref, q->load_plugins);
+                                         hw_device_ref, q->load_plugins, q->gpu_copy);
         if (ret < 0)
             return ret;
 
@@ -96,7 +140,7 @@ static int qsv_init_session(AVCodecContext *avctx, QSVContext *q, mfxSession ses
     } else {
         if (!q->internal_qs.session) {
             ret = ff_qsv_init_internal_session(avctx, &q->internal_qs,
-                                               q->load_plugins);
+                                               q->load_plugins, q->gpu_copy);
             if (ret < 0)
                 return ret;
         }
@@ -229,6 +273,9 @@ static int qsv_decode_init(AVCodecContext *avctx, QSVContext *q, mfxVideoParam *
 
     q->frame_info = param->mfx.FrameInfo;
 
+    if (!avctx->hw_frames_ctx)
+        q->pool = av_buffer_pool_init(av_image_get_buffer_size(avctx->pix_fmt,
+                    FFALIGN(avctx->width, 128), FFALIGN(avctx->height, 64), 1), av_buffer_allocz);
     return 0;
 }
 
@@ -275,7 +322,11 @@ static int alloc_frame(AVCodecContext *avctx, QSVContext *q, QSVFrame *frame)
 {
     int ret;
 
-    ret = ff_get_buffer(avctx, frame->frame, AV_GET_BUFFER_FLAG_REF);
+    if (q->pool)
+        ret = ff_qsv_get_continuous_buffer(avctx, frame->frame, q->pool);
+    else
+        ret = ff_get_buffer(avctx, frame->frame, AV_GET_BUFFER_FLAG_REF);
+
     if (ret < 0)
         return ret;
 
@@ -535,6 +586,7 @@ int ff_qsv_decode_close(QSVContext *q)
 
     av_buffer_unref(&q->frames_ctx.hw_frames_ctx);
     av_buffer_unref(&q->frames_ctx.mids_buf);
+    av_buffer_pool_uninit(&q->pool);
 
     return 0;
 }
diff --git a/libavcodec/qsvdec.h b/libavcodec/qsvdec.h
index 64dc8d2f47..dec1f61ceb 100644
--- a/libavcodec/qsvdec.h
+++ b/libavcodec/qsvdec.h
@@ -59,12 +59,14 @@ typedef struct QSVContext {
     enum AVPixelFormat orig_pix_fmt;
     uint32_t fourcc;
     mfxFrameInfo frame_info;
+    AVBufferPool *pool;
 
     int initialized;
 
     // options set by the caller
     int async_depth;
     int iopattern;
+    int gpu_copy;
 
     char *load_plugins;
 
diff --git a/libavcodec/qsvdec_h2645.c b/libavcodec/qsvdec_h2645.c
index eb1dc336a4..730feed20a 100644
--- a/libavcodec/qsvdec_h2645.c
+++ b/libavcodec/qsvdec_h2645.c
@@ -193,6 +193,11 @@ static const AVOption hevc_options[] = {
 
     { "load_plugins", "A :-separate list of hexadecimal plugin UIDs to load in an internal session",
         OFFSET(qsv.load_plugins), AV_OPT_TYPE_STRING, { .str = "" }, 0, 0, VD },
+
+    { "gpu_copy", "A GPU-accelerated copy between video and system memory", OFFSET(qsv.gpu_copy), AV_OPT_TYPE_INT, { .i64 = MFX_GPUCOPY_DEFAULT }, MFX_GPUCOPY_DEFAULT, MFX_GPUCOPY_OFF, VD, "gpu_copy"},
+        { "default", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = MFX_GPUCOPY_DEFAULT }, 0, 0, VD, "gpu_copy"},
+        { "on",      NULL, 0, AV_OPT_TYPE_CONST, { .i64 = MFX_GPUCOPY_ON },      0, 0, VD, "gpu_copy"},
+        { "off",     NULL, 0, AV_OPT_TYPE_CONST, { .i64 = MFX_GPUCOPY_OFF },     0, 0, VD, "gpu_copy"},
     { NULL },
 };
 
@@ -228,6 +233,11 @@ AVCodec ff_hevc_qsv_decoder = {
 #if CONFIG_H264_QSV_DECODER
 static const AVOption options[] = {
     { "async_depth", "Internal parallelization depth, the higher the value the higher the latency.", OFFSET(qsv.async_depth), AV_OPT_TYPE_INT, { .i64 = ASYNC_DEPTH_DEFAULT }, 1, INT_MAX, VD },
+
+    { "gpu_copy", "A GPU-accelerated copy between video and system memory", OFFSET(qsv.gpu_copy), AV_OPT_TYPE_INT, { .i64 = MFX_GPUCOPY_DEFAULT }, MFX_GPUCOPY_DEFAULT, MFX_GPUCOPY_OFF, VD, "gpu_copy"},
+        { "default", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = MFX_GPUCOPY_DEFAULT }, 0, 0, VD, "gpu_copy"},
+        { "on",      NULL, 0, AV_OPT_TYPE_CONST, { .i64 = MFX_GPUCOPY_ON },      0, 0, VD, "gpu_copy"},
+        { "off",     NULL, 0, AV_OPT_TYPE_CONST, { .i64 = MFX_GPUCOPY_OFF },     0, 0, VD, "gpu_copy"},
     { NULL },
 };
 
diff --git a/libavcodec/qsvdec_other.c b/libavcodec/qsvdec_other.c
index b044c11540..ff2834c20b 100644
--- a/libavcodec/qsvdec_other.c
+++ b/libavcodec/qsvdec_other.c
@@ -181,6 +181,11 @@ static void qsv_decode_flush(AVCodecContext *avctx)
 #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
 static const AVOption options[] = {
     { "async_depth", "Internal parallelization depth, the higher the value the higher the latency.", OFFSET(qsv.async_depth), AV_OPT_TYPE_INT, { .i64 = ASYNC_DEPTH_DEFAULT }, 1, INT_MAX, VD },
+
+    { "gpu_copy", "A GPU-accelerated copy between video and system memory", OFFSET(qsv.gpu_copy), AV_OPT_TYPE_INT, { .i64 = MFX_GPUCOPY_DEFAULT }, MFX_GPUCOPY_DEFAULT, MFX_GPUCOPY_OFF, VD, "gpu_copy"},
+        { "default", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = MFX_GPUCOPY_DEFAULT }, 0, 0, VD, "gpu_copy"},
+        { "on",      NULL, 0, AV_OPT_TYPE_CONST, { .i64 = MFX_GPUCOPY_ON },      0, 0, VD, "gpu_copy"},
+        { "off",     NULL, 0, AV_OPT_TYPE_CONST, { .i64 = MFX_GPUCOPY_OFF },     0, 0, VD, "gpu_copy"},
     { NULL },
 };
 
diff --git a/libavcodec/qsvenc.c b/libavcodec/qsvenc.c
index 207cdc1d61..ba85d645ca 100644
--- a/libavcodec/qsvenc.c
+++ b/libavcodec/qsvenc.c
@@ -956,7 +956,8 @@ static int qsvenc_init_session(AVCodecContext *avctx, QSVEncContext *q)
 
         ret = ff_qsv_init_session_frames(avctx, &q->internal_qs.session,
                                          &q->frames_ctx, q->load_plugins,
-                                         q->param.IOPattern == MFX_IOPATTERN_IN_OPAQUE_MEMORY);
+                                         q->param.IOPattern == MFX_IOPATTERN_IN_OPAQUE_MEMORY,
+                                         MFX_GPUCOPY_OFF);
         if (ret < 0) {
             av_buffer_unref(&q->frames_ctx.hw_frames_ctx);
             return ret;
@@ -965,14 +966,15 @@ static int qsvenc_init_session(AVCodecContext *avctx, QSVEncContext *q)
         q->session = q->internal_qs.session;
     } else if (avctx->hw_device_ctx) {
         ret = ff_qsv_init_session_device(avctx, &q->internal_qs.session,
-                                         avctx->hw_device_ctx, q->load_plugins);
+                                         avctx->hw_device_ctx, q->load_plugins,
+                                         MFX_GPUCOPY_OFF);
         if (ret < 0)
             return ret;
 
         q->session = q->internal_qs.session;
     } else {
         ret = ff_qsv_init_internal_session(avctx, &q->internal_qs,
-                                           q->load_plugins);
+                                           q->load_plugins, MFX_GPUCOPY_OFF);
         if (ret < 0)
             return ret;