ffmpeg: remuxer: fix "initialization discards 'const' qualifier from pointer target type" (#80)

* ffmpeg: fix compilation on `bookworm`
* workflows: test on `bookworm`

Co-authored-by: FacuM <facumo.fm@gmail.com>

.github/workflows/build_test.yaml

@@ -10,13 +10,13 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        debian_version: [bullseye]
+        debian_version: [bullseye, bookworm]
         docker_arch: [amd64, arm32v7, arm64v8]
         build_type: [generic, raspi]
         exclude:
           - docker_arch: amd64
             build_type: raspi
-          - debian_version: buster
+          - debian_version: bookworm
             build_type: raspi
     steps:
     - name: Checkout

Makefile

@@ -9,6 +9,10 @@ GIT_REVISION ?= $(shell git rev-parse --short HEAD)
 CFLAGS := -Werror -Wall -g -I$(CURDIR) -D_GNU_SOURCE
 LDLIBS := -lpthread -lstdc++
 
+# libdatachannel deprecations on bookworm
+# error: 'HMAC_Init_ex' is deprecated: Since OpenSSL 3.0
+CFLAGS += -Wno-error=deprecated-declarations
+
 ifneq (x,x$(shell which ccache))
 CCACHE ?= ccache
 endif

util/ffmpeg/remuxer.c

@@ -94,7 +94,12 @@ int ffmpeg_remuxer_open(ffmpeg_remuxer_t *remuxer)
   if (remuxer->packet)
     return 0;
 
-  AVInputFormat *input_format = av_find_input_format(remuxer->input_format);
+#if LIBAVFORMAT_VERSION_MAJOR < 59
+  AVInputFormat *input_format;
+#else
+  const AVInputFormat *input_format;
+#endif
+  input_format = av_find_input_format(remuxer->input_format);
   if (!input_format)
     return AVERROR(EINVAL);