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, 148 insertions, 0 deletions

diff --git a/filters/f_swscale.c b/filters/f_swscale.c
new file mode 100644
index 0000000000..953b5ec77e
--- /dev/null
+++ b/filters/f_swscale.c
@@ -0,0 +1,148 @@
+/*
+ * This file is part of mpv.
+ *
+ * mpv 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.
+ *
+ * mpv 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 mpv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+#include <inttypes.h>
+#include <stdarg.h>
+#include <assert.h>
+
+#include <libswscale/swscale.h>
+
+#include "common/av_common.h"
+#include "common/msg.h"
+
+#include "options/options.h"
+
+#include "video/img_format.h"
+#include "video/mp_image.h"
+#include "video/mp_image_pool.h"
+#include "video/sws_utils.h"
+#include "video/fmt-conversion.h"
+
+#include "f_swscale.h"
+#include "filter.h"
+#include "filter_internal.h"
+
+int mp_sws_find_best_out_format(int in_format, int *out_formats,
+                                int num_out_formats)
+{
+    if (sws_isSupportedInput(imgfmt2pixfmt(in_format)) < 1)
+        return 0;
+
+    int best = 0;
+    for (int n = 0; n < num_out_formats; n++) {
+        int out_format = out_formats[n];
+
+        if (sws_isSupportedOutput(imgfmt2pixfmt(out_format)) < 1)
+            continue;
+
+        if (best) {
+            int candidate = mp_imgfmt_select_best(best, out_format, in_format);
+            if (candidate)
+                best = candidate;
+        } else {
+            best = out_format;
+        }
+    }
+    return best;
+}
+
+bool mp_sws_supports_input(int imgfmt)
+{
+    return sws_isSupportedInput(imgfmt2pixfmt(imgfmt));
+}
+
+static void process(struct mp_filter *f)
+{
+    struct mp_sws_filter *s = f->priv;
+
+    if (!mp_pin_can_transfer_data(f->ppins[1], f->ppins[0]))
+        return;
+
+    struct mp_frame frame = mp_pin_out_read(f->ppins[0]);
+    if (mp_frame_is_signaling(frame)) {
+        mp_pin_in_write(f->ppins[1], frame);
+        return;
+    }
+
+    if (frame.type != MP_FRAME_VIDEO) {
+        MP_ERR(f, "video frame expected\n");
+        goto error;
+    }
+
+    struct mp_image *src = frame.data;
+    int dstfmt = s->out_format ? s->out_format : src->imgfmt;
+
+    struct mp_image *dst = mp_image_pool_get(s->pool, dstfmt, src->w, src->h);
+    if (!dst)
+        goto error;
+
+    mp_image_copy_attributes(dst, src);
+
+    // If we convert from RGB to YUV, default to limited range.
+    if (mp_imgfmt_get_forced_csp(src->imgfmt) == MP_CSP_RGB &&
+        mp_imgfmt_get_forced_csp(dst->imgfmt) == MP_CSP_AUTO)
+    {
+        dst->params.color.levels = MP_CSP_LEVELS_TV;
+    }
+    mp_image_params_guess_csp(&dst->params);
+
+    bool ok = mp_sws_scale(s->sws, dst, src) >= 0;
+
+    mp_frame_unref(&frame);
+    frame = (struct mp_frame){MP_FRAME_VIDEO, dst};
+
+    if (!ok)
+        goto error;
+
+    mp_pin_in_write(f->ppins[1], frame);
+    return;
+
+error:
+    mp_frame_unref(&frame);
+    mp_filter_internal_mark_failed(f);
+    return;
+}
+
+static const struct mp_filter_info sws_filter = {
+    .name = "swscale",
+    .priv_size = sizeof(struct mp_sws_filter),
+    .process = process,
+};
+
+struct mp_sws_filter *mp_sws_filter_create(struct mp_filter *parent)
+{
+    struct mp_filter *f = mp_filter_create(parent, &sws_filter);
+    if (!f)
+        return NULL;
+
+    mp_filter_add_pin(f, MP_PIN_IN, "in");
+    mp_filter_add_pin(f, MP_PIN_OUT, "out");
+
+    struct mp_sws_filter *s = f->priv;
+    s->f = f;
+    s->sws = mp_sws_alloc(s);
+    s->sws->log = f->log;
+    s->pool = mp_image_pool_new(s);
+
+    mp_sws_set_from_cmdline(s->sws, f->global);
+
+    return s;
+}