From e59a48003635af44ba2259c1033cfdf9e1dd5e54 Mon Sep 17 00:00:00 2001
From: Chris Tallon <chris@vomp.tv>
Date: Thu, 16 Feb 2023 17:45:15 +0000
Subject: [PATCH] Investigate deprecated avcodec_decode_audio4

---
 src/audioomx.cc | 43 +++++++++++++++++++++++++++++++++++++++++--
 src/audioomx.h  |  2 ++
 2 files changed, 43 insertions(+), 2 deletions(-)

diff --git a/src/audioomx.cc b/src/audioomx.cc
index dfa1d7e..1492455 100644
--- a/src/audioomx.cc
+++ b/src/audioomx.cc
@@ -2138,9 +2138,20 @@ u4 AudioOMX::DeliverMediaPacket(MediaPacket mpacket, const u1* buffer,
 
 				if ((int)gotframesize <= incoming_paket_libav.size) {
 					if (gotframesize>0) incoming_paket_libav.size=gotframesize;
-					// FIXME deprecated
+
+					// FIXME
+					// avcodec_decode_audio4 is deprecated
+					// DO_NOT_USE() works, but assumes all decoded data is returned
+					// in the first call to avcodec_receive_frame which is
+					// definitely bad code.
+					// This all needs reworking to handle this properly.
+					// Leaving DO_NOT_USE in the code in case we have to switch to it
 					len = avcodec_decode_audio4(current_context, decode_frame_libav,
 						&gotta, &incoming_paket_libav);
+
+					//len = DO_NOT_USE(current_context, decode_frame_libav,
+					//	&gotta, &incoming_paket_libav);
+
 				} else {
 					//LogNT::getInstance()->debug(TAG, "FRAME:E {} {}",gotframesize,incoming_paket_libav.size);
 					gotta=0;
@@ -2382,7 +2393,7 @@ void AudioOMX::ResetTimeOffsets()
   vw->ResetTimeOffsets();
 }
 
-
+// FIXME
 int AudioOMX::badMinimumFunction(u4 a, int b)
 {
   printf("MIN: P1: %u, P2: %i\n", a, b);
@@ -2390,3 +2401,31 @@ int AudioOMX::badMinimumFunction(u4 a, int b)
   if (a > b) return b;
   else return a;
 }
+
+int AudioOMX::DO_NOT_USE(AVCodecContext* avctx,    // used - sent to avcodec_send_packet
+						  AVFrame* frame,          // used - object for receive to write to
+						  int* got_frame_ptr,      // out param
+						  const AVPacket* avpkt)   // used - sent to avcodec_send_packet
+{
+  // Set this to error here. Any error point returns -9999 and *got_frame_ptr = 0
+  *got_frame_ptr = 0; // Replicate old API behaviour
+
+  int sendReturn = avcodec_send_packet(avctx, avpkt);
+  if (sendReturn < 0) return -9999; // error, shouldn't happen, just crash out.
+
+  // Don't use this code
+  // avcodec_receive_frame needs to be called multiple times
+  // to ensure reception of all decoded data
+  int recReturn = avcodec_receive_frame(avctx, frame);
+  if (recReturn == 0) // success
+  {
+	// set got_frame_ptr to 1, this is the old behaviour
+    *got_frame_ptr = 1;
+	// return number of bytes consumed
+	// guessing here that the calling code only ever supplies whole packets
+	return avpkt->size;
+  }
+
+  // error
+  return -9999; // no idea. looks like calling code checks got_frame_ptr
+}
diff --git a/src/audioomx.h b/src/audioomx.h
index 9e4146d..a82b1db 100644
--- a/src/audioomx.h
+++ b/src/audioomx.h
@@ -199,6 +199,8 @@ class AudioOMX : public Audio
 
 
     int badMinimumFunction(u4 a, int b);
+
+    int DO_NOT_USE(AVCodecContext* avctx, AVFrame* frame, int* got_frame_ptr, const AVPacket* avpkt);
 };
 
 #endif
-- 
2.39.2