hwdummy: improve assertions

modules/codec/avcodec/hwdummy.c

@@ -47,6 +47,9 @@ vlc_module_begin()
     add_shortcut("dummy")
 vlc_module_end()
 
+#define DECODER_MAGIC 0x12345678
+#define SURFACE_MAGIC 0x87654321
+
 struct vlc_va_sys_t
 {
     AVVDPAUContext context;
@@ -60,17 +63,15 @@ static int Lock(vlc_va_t *va, AVFrame *ff)
         ff->linesize[i] = 0;
     }
 
-    ff->data[0] = (void *)va; /* must be non-NULL */
-    ff->data[3] = (void *)va;
-    ff->opaque = (void *)va;
+    ff->data[0] = (void *)(uintptr_t)SURFACE_MAGIC; /* must be non-NULL */
+    ff->data[3] = (void *)(uintptr_t)SURFACE_MAGIC;
+    ff->opaque = (void *)(uintptr_t)SURFACE_MAGIC;
     return VLC_SUCCESS;
 }
 
 static void Unlock(vlc_va_t *va, AVFrame *ff)
 {
     (void) va;
-
-    assert(ff->opaque == va);
     ff->data[0] = ff->data[3] = NULL;
     ff->opaque = NULL;
 }
@@ -82,6 +83,8 @@ static VdpStatus Render(VdpDecoder decoder, VdpVideoSurface target,
 {
     (void) decoder; (void) target; (void) picture_info;
     (void) bitstream_buffer_count; (void) bitstream_buffers;
+    assert(decoder == DECODER_MAGIC);
+    assert(target == SURFACE_MAGIC);
     return VDP_STATUS_OK;
 }
 
@@ -89,6 +92,9 @@ static int Copy(vlc_va_t *va, picture_t *pic, AVFrame *ff)
 {
     (void) va; (void) ff;
 
+    assert((uintptr_t)ff->data[3] == SURFACE_MAGIC);
+    assert((uintptr_t)ff->opaque == SURFACE_MAGIC);
+
     /* Put some dummy picture content */
     memset(pic->p[0].p_pixels, 0xF0,
            pic->p[0].i_pitch * pic->p[0].i_visible_lines);
@@ -128,6 +134,7 @@ static int Open(vlc_va_t *va, int codec, const es_format_t *fmt)
     msg_Dbg(va, "codec %d (%4.4s) profile %d level %d", codec, u.str,
             fmt->i_profile, fmt->i_level);
 
+    sys->context.decoder = DECODER_MAGIC;
     sys->context.render = Render;
 
     va->sys = sys;