video: rewrite filtering glue code

Get rid of the old vf.c code. Replace it with a generic filtering
framework, which can potentially handle more than just --vf. At least
reimplementing --af with this code is planned.

This changes some --vf semantics (including runtime behavior and the
"vf" command). The most important ones are listed in interface-changes.

vf_convert.c is renamed to f_swscale.c. It is now an internal filter
that can not be inserted by the user manually.

f_lavfi.c is a refactor of player/lavfi.c. The latter will be removed
once --lavfi-complex is reimplemented on top of f_lavfi.c. (which is
conceptually easy, but a big mess due to the data flow changes).

The existing filters are all changed heavily. The data flow of the new
filter framework is different. Especially EOF handling changes - EOF is
now a "frame" rather than a state, and must be passed through exactly
once.

Another major thing is that all filters must support dynamic format
changes. The filter reconfig() function goes away. (This sounds complex,
but since all filters need to handle EOF draining anyway, they can use
the same code, and it removes the mess with reconfig() having to predict
the output format, which completely breaks with libavfilter anyway.)

In addition, there is no automatic format negotiation or conversion.
libavfilter's primitive and insufficient API simply doesn't allow us to
do this in a reasonable way. Instead, filters can use f_autoconvert as
sub-filter, and tell it which formats they support. This filter will in
turn add actual conversion filters, such as f_swscale, to perform
necessary format changes.

vf_vapoursynth.c uses the same basic principle of operation as before,
but with worryingly different details in data flow. Still appears to
work.

The hardware deint filters (vf_vavpp.c, vf_d3d11vpp.c, vf_vdpaupp.c) are
heavily changed. Fortunately, they all used refqueue.c, which is for
sharing the data flow logic (especially for managing future/past
surfaces and such). It turns out it can be used to factor out most of
the data flow. Some of these filters accepted software input. Instead of
having ad-hoc upload code in each filter, surface upload is now
delegated to f_autoconvert, which can use f_hwupload to perform this.

Exporting VO capabilities is still a big mess (mp_stream_info stuff).

The D3D11 code drops the redundant image formats, and all code uses the
hw_subfmt (sw_format in FFmpeg) instead. Although that too seems to be a
big mess for now.

f_async_queue is unused.

1 files changed, 179 insertions, 0 deletions

diff --git a/filters/frame.c b/filters/frame.c
new file mode 100644
index 0000000000..6c5b28e77a
--- /dev/null
+++ b/filters/frame.c
@@ -0,0 +1,179 @@
+#include <libavutil/frame.h>
+
+#include "audio/aframe.h"
+#include "common/av_common.h"
+#include "video/mp_image.h"
+
+#include "frame.h"
+
+struct frame_handler {
+    const char *name;
+    bool is_data;
+    bool is_signaling;
+    void *(*new_ref)(void *data);
+    // The following must be non-NULL if new_ref is non-NULL.
+    double (*get_pts)(void *data);
+    void (*set_pts)(void *data, double pts);
+    AVFrame *(*new_av_ref)(void *data);
+    void *(*from_av_ref)(AVFrame *data);
+    void (*free)(void *data);
+};
+
+static void *video_ref(void *data)
+{
+    return mp_image_new_ref(data);
+}
+
+static double video_get_pts(void *data)
+{
+    return ((struct mp_image *)data)->pts;
+}
+
+static void video_set_pts(void *data, double pts)
+{
+    ((struct mp_image *)data)->pts = pts;
+}
+
+static AVFrame *video_new_av_ref(void *data)
+{
+    return mp_image_to_av_frame(data);
+}
+
+static void *video_from_av_ref(AVFrame *data)
+{
+    return mp_image_from_av_frame(data);
+}
+
+static void *audio_ref(void *data)
+{
+    return mp_aframe_new_ref(data);
+}
+
+static double audio_get_pts(void *data)
+{
+    return mp_aframe_get_pts(data);
+}
+
+static void audio_set_pts(void *data, double pts)
+{
+    mp_aframe_set_pts(data, pts);
+}
+
+static AVFrame *audio_new_av_ref(void *data)
+{
+    return mp_aframe_to_avframe(data);
+}
+
+static void *audio_from_av_ref(AVFrame *data)
+{
+    return mp_aframe_from_avframe(data);
+}
+
+static const struct frame_handler frame_handlers[] = {
+    [MP_FRAME_NONE] = {
+        .name = "none",
+    },
+    [MP_FRAME_EOF] = {
+        .name = "eof",
+        .is_signaling = true,
+    },
+    [MP_FRAME_VIDEO] = {
+        .name = "video",
+        .is_data = true,
+        .new_ref = video_ref,
+        .get_pts = video_get_pts,
+        .set_pts = video_set_pts,
+        .new_av_ref = video_new_av_ref,
+        .from_av_ref = video_from_av_ref,
+        .free = talloc_free,
+    },
+    [MP_FRAME_AUDIO] = {
+        .name = "audio",
+        .is_data = true,
+        .new_ref = audio_ref,
+        .get_pts = audio_get_pts,
+        .set_pts = audio_set_pts,
+        .new_av_ref = audio_new_av_ref,
+        .from_av_ref = audio_from_av_ref,
+        .free = talloc_free,
+    },
+};
+
+const char *mp_frame_type_str(enum mp_frame_type t)
+{
+    return frame_handlers[t].name;
+}
+
+bool mp_frame_is_data(struct mp_frame frame)
+{
+    return frame_handlers[frame.type].is_data;
+}
+
+bool mp_frame_is_signaling(struct mp_frame frame)
+{
+    return frame_handlers[frame.type].is_signaling;
+}
+
+void mp_frame_unref(struct mp_frame *frame)
+{
+    if (!frame)
+        return;
+
+    if (frame_handlers[frame->type].free)
+        frame_handlers[frame->type].free(frame->data);
+
+    *frame = (struct mp_frame){0};
+}
+
+struct mp_frame mp_frame_ref(struct mp_frame frame)
+{
+    if (frame_handlers[frame.type].new_ref) {
+        assert(frame.data);
+        frame.data = frame_handlers[frame.type].new_ref(frame.data);
+        if (!frame.data)
+            frame.type = MP_FRAME_NONE;
+    }
+    return frame;
+}
+
+double mp_frame_get_pts(struct mp_frame frame)
+{
+    if (frame_handlers[frame.type].get_pts)
+        return frame_handlers[frame.type].get_pts(frame.data);
+    return MP_NOPTS_VALUE;
+}
+
+void mp_frame_set_pts(struct mp_frame frame, double pts)
+{
+    if (frame_handlers[frame.type].get_pts)
+        frame_handlers[frame.type].set_pts(frame.data, pts);
+}
+
+AVFrame *mp_frame_to_av(struct mp_frame frame, struct AVRational *tb)
+{
+    if (!frame_handlers[frame.type].new_av_ref)
+        return NULL;
+
+    AVFrame *res = frame_handlers[frame.type].new_av_ref(frame.data);
+    if (!res)
+        return NULL;
+
+    res->pts = mp_pts_to_av(mp_frame_get_pts(frame), tb);
+    return res;
+}
+
+struct mp_frame mp_frame_from_av(enum mp_frame_type type, struct AVFrame *frame,
+                                 struct AVRational *tb)
+{
+    struct mp_frame res = {type};
+
+    if (!frame_handlers[res.type].from_av_ref)
+        return MP_NO_FRAME;
+
+    res.data = frame_handlers[res.type].from_av_ref(frame);
+    if (!res.data)
+        return MP_NO_FRAME;
+
+    mp_frame_set_pts(res, mp_pts_from_av(frame->pts, tb));
+    return res;
+}