From f5c4d38c78347b09478e21a661befff4b2d44643 Mon Sep 17 00:00:00 2001
From: Anton Khirnov <anton@khirnov.net>
Date: Tue, 14 Jul 2015 18:16:26 +0200
Subject: qsvdec: properly handle asynchronous decoding

Wait for async_depth frames before syncing.
---
 libavcodec/qsvdec.c | 41 +++++++++++++++++++++++++++++++++--------
 1 file changed, 33 insertions(+), 8 deletions(-)

(limited to 'libavcodec/qsvdec.c')

diff --git a/libavcodec/qsvdec.c b/libavcodec/qsvdec.c
index 6fd9442b7f..da9b082d09 100644
--- a/libavcodec/qsvdec.c
+++ b/libavcodec/qsvdec.c
@@ -73,6 +73,11 @@ int ff_qsv_decode_init(AVCodecContext *avctx, QSVContext *q, mfxSession session)
     mfxVideoParam param = { { 0 } };
     int ret;
 
+    q->async_fifo = av_fifo_alloc((1 + q->async_depth) *
+                                  (sizeof(mfxSyncPoint) + sizeof(QSVFrame*)));
+    if (!q->async_fifo)
+        return AVERROR(ENOMEM);
+
     ret = qsv_init_session(avctx, q, session);
     if (ret < 0) {
         av_log(avctx, AV_LOG_ERROR, "Error initializing an MFX session\n");
@@ -142,7 +147,7 @@ static void qsv_clear_unused_frames(QSVContext *q)
 {
     QSVFrame *cur = q->work_frames;
     while (cur) {
-        if (cur->surface && !cur->surface->Data.Locked) {
+        if (cur->surface && !cur->surface->Data.Locked && !cur->queued) {
             cur->surface = NULL;
             av_frame_unref(cur->frame);
         }
@@ -191,12 +196,12 @@ static int get_surface(AVCodecContext *avctx, QSVContext *q, mfxFrameSurface1 **
     return 0;
 }
 
-static AVFrame *find_frame(QSVContext *q, mfxFrameSurface1 *surf)
+static QSVFrame *find_frame(QSVContext *q, mfxFrameSurface1 *surf)
 {
     QSVFrame *cur = q->work_frames;
     while (cur) {
         if (surf == cur->surface)
-            return cur->frame;
+            return cur;
         cur = cur->next;
     }
     return NULL;
@@ -206,6 +211,7 @@ int ff_qsv_decode(AVCodecContext *avctx, QSVContext *q,
                   AVFrame *frame, int *got_frame,
                   AVPacket *avpkt)
 {
+    QSVFrame *out_frame;
     mfxFrameSurface1 *insurf;
     mfxFrameSurface1 *outsurf;
     mfxSyncPoint sync;
@@ -240,21 +246,37 @@ int ff_qsv_decode(AVCodecContext *avctx, QSVContext *q,
     }
 
     if (sync) {
-        AVFrame *src_frame;
-
-        MFXVideoCORE_SyncOperation(q->session, sync, 60000);
+        QSVFrame *out_frame = find_frame(q, outsurf);
 
-        src_frame = find_frame(q, outsurf);
-        if (!src_frame) {
+        if (!out_frame) {
             av_log(avctx, AV_LOG_ERROR,
                    "The returned surface does not correspond to any frame\n");
             return AVERROR_BUG;
         }
 
+        out_frame->queued = 1;
+        av_fifo_generic_write(q->async_fifo, &out_frame, sizeof(out_frame), NULL);
+        av_fifo_generic_write(q->async_fifo, &sync,      sizeof(sync),      NULL);
+    }
+
+    if (!av_fifo_space(q->async_fifo) ||
+        (!avpkt->size && av_fifo_size(q->async_fifo))) {
+        AVFrame *src_frame;
+
+        av_fifo_generic_read(q->async_fifo, &out_frame, sizeof(out_frame), NULL);
+        av_fifo_generic_read(q->async_fifo, &sync,      sizeof(sync),      NULL);
+        out_frame->queued = 0;
+
+        MFXVideoCORE_SyncOperation(q->session, sync, 60000);
+
+        src_frame = out_frame->frame;
+
         ret = av_frame_ref(frame, src_frame);
         if (ret < 0)
             return ret;
 
+        outsurf = out_frame->surface;
+
         frame->pkt_pts = frame->pts = outsurf->Data.TimeStamp;
 
         frame->repeat_pict =
@@ -283,6 +305,9 @@ int ff_qsv_decode_close(QSVContext *q)
         cur = q->work_frames;
     }
 
+    av_fifo_free(q->async_fifo);
+    q->async_fifo = NULL;
+
     if (q->internal_session)
         MFXClose(q->internal_session);
 
-- 
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