test: add non-regression test for CVPX snapshot

Add a CVPX_NV12 -> png conversion test to ensure it doesn't crash.

Refs #27721

test/Makefile.am

@@ -50,6 +50,10 @@ check_PROGRAMS = \
 	test_modules_playlist_m3u \
 	$(NULL)
 
+if HAVE_DARWIN
+check_PROGRAMS += test_src_misc_image_cvpx
+endif
+
 if ENABLE_SOUT
 check_PROGRAMS += test_modules_tls \
 	test_modules_stream_out_transcode \
@@ -136,6 +140,9 @@ test_src_misc_epg_SOURCES = src/misc/epg.c
 test_src_misc_epg_LDADD = $(LIBVLCCORE) $(LIBVLC)
 test_src_misc_keystore_SOURCES = src/misc/keystore.c
 test_src_misc_keystore_LDADD = $(LIBVLCCORE) $(LIBVLC)
+test_src_misc_image_cvpx_SOURCES = src/misc/image_cvpx.c
+test_src_misc_image_cvpx_LDADD = $(LIBVLCCORE) $(LIBVLC) ../modules/libvlc_vtutils.la
+test_src_misc_image_cvpx_LDFLAGS = $(AM_LDFLAGS) -Wl,-framework,CoreVideo
 test_src_interface_dialog_SOURCES = src/interface/dialog.c
 test_src_interface_dialog_LDADD = $(LIBVLCCORE) $(LIBVLC)
 test_src_media_source_LDADD = $(LIBVLCCORE) $(LIBVLC)

test/src/misc/image_cvpx.c

+/*****************************************************************************
+ * image_cvpx.c: export test for image_handler with cvpx sources
+ *****************************************************************************
+ * Copyright (C) 2023 Videolabs
+ *
+ * Authors: Alexandre Janniaux <ajanni@videolabs.io>
+ *
+ * This program 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.
+ *
+ * This program 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 this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+ *****************************************************************************/
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+/* Define a builtin module for mocked parts */
+#define MODULE_NAME test_misc_image_cvpx
+#define MODULE_STRING "test_misc_image_cvpx"
+#undef __PLUGIN__
+const char vlc_module_name[] = MODULE_STRING;
+
+#include "../../libvlc/test.h"
+#include "../../../modules/codec/vt_utils.h"
+
+#include <vlc/vlc.h>
+
+#include <vlc_common.h>
+#include <vlc_image.h>
+#include <vlc_picture.h>
+#include <vlc_plugin.h>
+#include <vlc_block.h>
+
+#include <limits.h>
+
+static int OpenIntf(vlc_object_t *root)
+{
+    image_handler_t *ih = image_HandlerCreate(root);
+    assert(ih != NULL);
+
+    video_format_t fmt_in;
+    video_format_Init(&fmt_in, VLC_CODEC_CVPX_NV12);
+    fmt_in.i_width = fmt_in.i_visible_width = 800;
+    fmt_in.i_height = fmt_in.i_visible_height = 600;
+
+    CVPixelBufferPoolRef pool = cvpxpool_create(&fmt_in, 1);
+    assert(pool != NULL);
+
+    CVPixelBufferRef buffer = cvpxpool_new_cvpx(pool);
+    assert(buffer != NULL);
+
+    picture_t *picture = picture_NewFromFormat(&fmt_in);
+    assert(picture != NULL);
+
+    struct vlc_decoder_device *device = NULL;
+    static const struct vlc_video_context_operations ops = {
+        NULL
+    };
+
+    struct vlc_video_context *vctx =vlc_video_context_CreateCVPX(
+      device, CVPX_VIDEO_CONTEXT_DEFAULT, 0, &ops);
+    int ret = cvpxpic_attach(picture, buffer, vctx,
+                             NULL /* TODO: check everything is released */);
+    assert(ret == VLC_SUCCESS);
+
+    video_format_t fmt_out;
+    video_format_Init(&fmt_out, VLC_CODEC_PNG);
+    fmt_out.i_width = fmt_out.i_visible_width = 800;
+    fmt_out.i_height = fmt_out.i_visible_height = 600;
+
+    block_t *block;
+
+    block = image_Write(ih, picture, &fmt_in, &fmt_out);
+    assert(block != NULL);
+    block_Release(block);
+    image_HandlerDelete(ih);
+
+    return VLC_SUCCESS;
+}
+
+/** Inject the mocked modules as a static plugin: **/
+vlc_module_begin()
+    set_callback(OpenIntf)
+    set_capability("interface", 0)
+vlc_module_end()
+
+/* Helper typedef for vlc_static_modules */
+typedef int (*vlc_plugin_cb)(vlc_set_cb, void*);
+
+VLC_EXPORT const vlc_plugin_cb vlc_static_modules[] = {
+    VLC_SYMBOL(vlc_entry),
+    NULL
+};
+
+
+int main()
+{
+    test_init();
+
+    const char * const args[] = {
+        "-vvv", "--vout=dummy", "--aout=dummy", "--text-renderer=dummy",
+        "--no-auto-preparse",
+    };
+
+    libvlc_instance_t *vlc = libvlc_new(ARRAY_SIZE(args), args);
+
+    libvlc_add_intf(vlc, MODULE_STRING);
+    libvlc_playlist_play(vlc);
+
+    libvlc_release(vlc);
+
+}
+