mmaldec: disable timestamp interpolation

This MMAL feature fills in missing timestamps from the framerate set on
the input port. This is generally unwanted, since libavcodec decoders
merely pass through timestamps without ever "fixing" them. The framerate
is also unknown, and even the timebase doesn't have to be set.

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

diff --git a/libavcodec/mmaldec.c b/libavcodec/mmaldec.c
index 5692f50..f4bf921 100644 (file)
--- a/libavcodec/mmaldec.c
+++ b/libavcodec/mmaldec.c
@@ -26,6 +26,7 @@
 
 #include <bcm_host.h>
 #include <interface/mmal/mmal.h>
+#include <interface/mmal/mmal_parameters_video.h>
 #include <interface/mmal/util/mmal_util.h>
 #include <interface/mmal/util/mmal_util_params.h>
 #include <interface/mmal/util/mmal_default_components.h>
@@ -277,6 +278,9 @@ static int ffmal_update_format(AVCodecContext *avctx)
     if ((status = mmal_port_parameter_set_uint32(decoder->output[0], MMAL_PARAMETER_EXTRA_BUFFERS, ctx->extra_buffers)))
         goto fail;
 
+    if ((status = mmal_port_parameter_set_boolean(decoder->output[0], MMAL_PARAMETER_VIDEO_INTERPOLATE_TIMESTAMPS, 0)))
+        goto fail;
+
     if (avctx->pix_fmt == AV_PIX_FMT_MMAL) {
         format_out->encoding = MMAL_ENCODING_OPAQUE;
     } else {