avcodec/encode: Set AV_PKT_FLAG_KEY based upon AV_CODEC_PROP_INTRA_ONLY

Currently, the AV_PKT_FLAG_KEY is automatically set for audio encoders;
yet this is wrong, as both MLP and TrueHD have non-keyframes. So set it
based upon AV_CODEC_PROP_INTRA_ONLY (from the corresponding
AVCodecDescriptor) instead. This also sets it for some video codecs,
which is intended.

Reviewed-by: James Almer <jamrial@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/libavcodec/internal.h b/libavcodec/internal.h
index 2111f2b9ae..b6180f15a5 100644
--- a/libavcodec/internal.h
+++ b/libavcodec/internal.h
@@ -153,6 +153,13 @@ typedef struct AVCodecInternal {
     uint8_t *byte_buffer;
     unsigned int byte_buffer_size;
 
+    /**
+     * This is set to AV_PKT_FLAG_KEY for encoders that encode intra-only
+     * formats (i.e. whose codec descriptor has AV_CODEC_PROP_INTRA_ONLY set).
+     * This is used to set said flag generically for said encoders.
+     */
+    int intra_only_flag;
+
     void *frame_thread_encoder;
 
     EncodeSimpleContext es;