[PATCH v6 3/3] winegstreamer: Use an atomic queue for wg_transform input buffers.

[Rémi Bernon]

From: Rémi Bernon

And push them one by one until an output buffer is generated, to avoid
generating multiple output buffers without a backing wg_sample.

This makes zero-copy more efficient for games which queue multiple input
buffers before checking output, such as Yakuza 4.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=45988
Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=47084
Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=49715
Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=52183
Signed-off-by: Rémi Bernon 
---
 dlls/winegstreamer/wg_transform.c | 70 +++++++++++++++++--------------
 1 file changed, 39 insertions(+), 31 deletions(-)

diff --git a/dlls/winegstreamer/wg_transform.c b/dlls/winegstreamer/wg_transform.c
index adefd16c787..070263698fb 100644
--- a/dlls/winegstreamer/wg_transform.c
+++ b/dlls/winegstreamer/wg_transform.c
@@ -51,8 +51,10 @@ struct wg_transform
     GstPad *my_src, *my_sink;
     GstPad *their_sink, *their_src;
     GstSegment segment;
-    GstBufferList *input;
+
     guint input_max_length;
+    GstAtomicQueue *input_queue;
+
     guint output_plane_align;
     struct wg_sample *output_wg_sample;
     GstAtomicQueue *output_queue;
@@ -215,9 +217,11 @@ NTSTATUS wg_transform_destroy(void *args)
 {
     struct wg_transform *transform = args;
     GstSample *sample;
+    GstBuffer *buffer;

-    if (transform->input)
-        gst_buffer_list_unref(transform->input);
+    while ((buffer = gst_atomic_queue_pop(transform->input_queue)))
+        gst_buffer_unref(buffer);
+    gst_atomic_queue_unref(transform->input_queue);

gst_element_set_state(transform->container, GST_STATE_NULL);

@@ -336,7 +340,7 @@ NTSTATUS wg_transform_create(void *args)
         return STATUS_NO_MEMORY;
     if (!(transform->container = gst_bin_new("wg_transform")))
         goto out;
-    if (!(transform->input = gst_buffer_list_new()))
+    if (!(transform->input_queue = gst_atomic_queue_new(8)))
         goto out;
     if (!(transform->output_queue = gst_atomic_queue_new(8)))
         goto out;
@@ -503,8 +507,8 @@ out:
         wg_allocator_destroy(transform->allocator);
     if (transform->output_queue)
         gst_atomic_queue_unref(transform->output_queue);
-    if (transform->input)
-        gst_buffer_list_unref(transform->input);
+    if (transform->input_queue)
+        gst_atomic_queue_unref(transform->input_queue);
     if (transform->container)
     {
         gst_element_set_state(transform->container, GST_STATE_NULL);
@@ -530,7 +534,7 @@ NTSTATUS wg_transform_push_data(void *args)
     GstBuffer *buffer;
     guint length;

-    length = gst_buffer_list_length(transform->input);
+    length = gst_atomic_queue_length(transform->input_queue);
     if (length >= transform->input_max_length)
     {
         GST_INFO("Refusing %u bytes, %u buffers already queued", sample->size, length);
@@ -556,7 +560,7 @@ NTSTATUS wg_transform_push_data(void *args)
         GST_BUFFER_DURATION(buffer) = sample->duration * 100;
     if (!(sample->flags & WG_SAMPLE_FLAG_SYNC_POINT))
         GST_BUFFER_FLAG_SET(buffer, GST_BUFFER_FLAG_DELTA_UNIT);
-    gst_buffer_list_insert(transform->input, -1, buffer);
+    gst_atomic_queue_push(transform->input_queue, buffer);

params->result = S_OK;
     return STATUS_SUCCESS;
@@ -705,48 +709,52 @@ static NTSTATUS read_transform_output_data(GstBuffer *buffer, GstCaps *caps, gsi
     return STATUS_SUCCESS;
 }

-NTSTATUS wg_transform_read_data(void *args)
+static bool get_transform_output(struct wg_transform *transform, struct wg_sample *sample)
 {
-    struct wg_transform_read_data_params *params = args;
-    struct wg_transform *transform = params->transform;
-    struct wg_sample *sample = params->sample;
-    struct wg_format *format = params->format;
     GstFlowReturn ret = GST_FLOW_OK;
-    GstBuffer *output_buffer;
-    GstBufferList *input;
-    GstCaps *output_caps;
-    bool discard_data;
-    NTSTATUS status;
+    GstBuffer *input_buffer;

/* Provide the sample for transform_request_sample to pick it up */
     InterlockedIncrement(&sample->refcount);
     InterlockedExchangePointer((void **)&transform->output_wg_sample, sample);

-    if (!gst_buffer_list_length(transform->input))
-        GST_DEBUG("Not input buffer queued");
-    else if ((input = gst_buffer_list_new()))
+    while (!(transform->output_sample = gst_atomic_queue_pop(transform->output_queue)))
     {
-        ret = gst_pad_push_list(transform->my_src, transform->input);
-        transform->input = input;
-    }
-    else
-    {
-        GST_ERROR("Failed to allocate new input queue");
-        ret = GST_FLOW_ERROR;
+        if (!(input_buffer = gst_atomic_queue_pop(transform->input_queue)))
+            break;
+
+        if ((ret = gst_pad_push(transform->my_src, input_buffer)))
+        {
+            GST_ERROR("Failed to push transform input, error %d", ret);
+            break;
+        }
     }

/* Remove the sample so transform_request_sample cannot use it */
     if (InterlockedExchangePointer((void **)&transform->output_wg_sample, NULL))
         InterlockedDecrement(&sample->refcount);

-    if (ret)
+    return ret == GST_FLOW_OK;
+}
+
+NTSTATUS wg_transform_read_data(void *args)
+{
+    struct wg_transform_read_data_params *params = args;
+    struct wg_transform *transform = params->transform;
+    struct wg_sample *sample = params->sample;
+    struct wg_format *format = params->format;
+    GstBuffer *output_buffer;
+    GstCaps *output_caps;
+    bool discard_data;
+    NTSTATUS status;
+
+    if (!transform->output_sample && !get_transform_output(transform, sample))
     {
-        GST_ERROR("Failed to push transform input, error %d", ret);
         wg_allocator_release_sample(transform->allocator, sample, false);
         return STATUS_UNSUCCESSFUL;
     }

-    if (!transform->output_sample && !(transform->output_sample = gst_atomic_queue_pop(transform->output_queue)))
+    if (!transform->output_sample)
     {
         sample->size = 0;
         params->result = MF_E_TRANSFORM_NEED_MORE_INPUT;