expose discard, trusted and disposable packet flags

---------

Co-authored-by: Scott Kirklin <[email protected]>
Co-authored-by: WyattBlue <[email protected]>
Co-authored-by: JoeUgly <[email protected]>

av/packet.pyi

@@ -16,6 +16,9 @@ class Packet:
     duration: int | None
     is_keyframe: bool
     is_corrupt: bool
+    is_discard: bool
+    is_trusted: bool
+    is_disposable: bool
 
     def __init__(self, input: int | None = None) -> None: ...
     def decode(self) -> Iterator[SubtitleSet]: ...

av/packet.pyx

@@ -189,11 +189,25 @@ cdef class Packet(Buffer):
             self.ptr.flags &= ~(lib.AV_PKT_FLAG_KEY)
 
     @property
-    def is_corrupt(self): return bool(self.ptr.flags & lib.AV_PKT_FLAG_CORRUPT)
+    def is_corrupt(self):
+        return bool(self.ptr.flags & lib.AV_PKT_FLAG_CORRUPT)
 
     @is_corrupt.setter
     def is_corrupt(self, v):
         if v:
             self.ptr.flags |= lib.AV_PKT_FLAG_CORRUPT
         else:
             self.ptr.flags &= ~(lib.AV_PKT_FLAG_CORRUPT)
+
+    @property
+    def is_discard(self): 
+        return bool(self.ptr.flags & lib.AV_PKT_FLAG_DISCARD)
+
+    @property
+    def is_trusted(self):
+        return bool(self.ptr.flags & lib.AV_PKT_FLAG_TRUSTED)
+
+    @property
+    def is_disposable(self):
+        return bool(self.ptr.flags & lib.AV_PKT_FLAG_DISPOSABLE)
+

include/libavcodec/avcodec.pxd

@@ -90,6 +90,9 @@ cdef extern from "libavcodec/avcodec.h" nogil:
     cdef enum:
         AV_PKT_FLAG_KEY
         AV_PKT_FLAG_CORRUPT
+        AV_PKT_FLAG_DISCARD
+        AV_PKT_FLAG_TRUSTED
+        AV_PKT_FLAG_DISPOSABLE
 
     cdef enum:
         AV_FRAME_FLAG_CORRUPT

tests/test_packet.py

@@ -0,0 +1,41 @@
+import av
+
+from .common import TestCase, fate_suite
+
+
+class TestProperties(TestCase):
+    def test_is_keyframe(self):
+        with av.open(fate_suite("h264/interlaced_crop.mp4")) as container:
+            stream = container.streams.video[0]
+            for i, packet in enumerate(container.demux(stream)):
+                if i in (0, 21, 45, 69, 93, 117):
+                    self.assertTrue(packet.is_keyframe)
+                else:
+                    self.assertFalse(packet.is_keyframe)
+
+    def test_is_corrupt(self):
+        with av.open(fate_suite("mov/white_zombie_scrunch-part.mov")) as container:
+            stream = container.streams.video[0]
+            for i, packet in enumerate(container.demux(stream)):
+                if i == 65:
+                    self.assertTrue(packet.is_corrupt)
+                else:
+                    self.assertFalse(packet.is_corrupt)
+
+    def test_is_discard(self):
+        with av.open(fate_suite("mov/mov-1elist-ends-last-bframe.mov")) as container:
+            stream = container.streams.video[0]
+            for i, packet in enumerate(container.demux(stream)):
+                if i == 46:
+                    self.assertTrue(packet.is_discard)
+                else:
+                    self.assertFalse(packet.is_discard)
+
+    def test_is_disposable(self):
+        with av.open(fate_suite("hap/HAPQA_NoSnappy_127x1.mov")) as container:
+            stream = container.streams.video[0]
+            for i, packet in enumerate(container.demux(stream)):
+                if i == 0:
+                    self.assertTrue(packet.is_disposable)
+                else:
+                    self.assertFalse(packet.is_disposable)