vd_lavc: let hardware decoder request delaying frames explicitly

Until now, the presence of the process_image() callback was used to set
a delay queue with a hardcoded size. Change this to a vd_lavc_hwdec
field instead, so the decoder can explicitly set this if it's really
needed.

Do this so process_image() can be used in the VideoToolbox glue code for
something entirely unrelated.

1 files changed, 1 insertions, 4 deletions

diff --git a/video/decode/vd_lavc.c b/video/decode/vd_lavc.c
index 175df0bc6e..a444f88c10 100644
--- a/video/decode/vd_lavc.c
+++ b/video/decode/vd_lavc.c
@@ -401,10 +401,7 @@ static void init_avctx(struct dec_video *vd, const char *decoder,
             avctx->get_buffer2 = get_buffer2_hwdec;
         if (ctx->hwdec->init(ctx) < 0)
             goto error;
-        // This can increase efficiency by not blocking on the hardware
-        // pipeline by reading back immediately after decoding.
-        if (ctx->hwdec->process_image)
-            ctx->max_delay_queue = HWDEC_DELAY_QUEUE_COUNT;
+        ctx->max_delay_queue = ctx->hwdec->delay_queue;
     } else {
         mp_set_avcodec_threads(vd->log, avctx, lavc_param->threads);
     }