[FFMPEG] support ffmpeg 7

.github/workflows/build_cpp.yml

@@ -195,6 +195,39 @@ jobs:
     - name: Build examples, etc
       run: cmake --build build --config Release --parallel 2
 
+  ubuntu-latest-ffmpeg7:
+    runs-on: 'ubuntu-latest'
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Install dependencies
+      run: |
+        sudo apt update
+        sudo apt install make yasm 
+
+    - name: Cache FFmpeg 7
+      uses: actions/cache@v3
+      id: cache-ffmpeg7
+      with:
+        path: /home/runner/ffmpeg-n7.0.1_installation
+        key: ffmpeg-n7.0.1_try2
+
+    - name: Build FFmpeg 7
+      if: steps.cache-ffmpeg7.outputs.cache-hit != 'true'
+      run: |
+        wget https://github.com/FFmpeg/FFmpeg/archive/refs/tags/n7.0.1.tar.gz
+        tar -xf n7.0.1.tar.gz
+        cd FFmpeg-n7.0.1
+        ./configure --prefix=/home/runner/ffmpeg-n7.0.1_installation --disable-doc --disable-programs
+        make -j4
+        make install
+        cd ..
+
+    - name: Configure
+      run: cmake . -B build -DCMAKE_PREFIX_PATH=/home/runner/ffmpeg-n7.0.1_installation
+    - name: Build ffmpeg example
+      run: cmake --build build --config Release --target ffmpeg_video_muxing_ex --parallel 4
+
   windows-latest:
     runs-on: 'windows-latest'
     steps:

dlib/media/ffmpeg_details.h

@@ -64,6 +64,10 @@ extern "C" {
 #include <memory>
 #include "../logger.h"
 
+#if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(59, 24, 100)
+#define FFMPEG_HAS_CH_LAYOUT 1
+#endif
+
 namespace dlib { namespace ffmpeg { namespace details
 {
 
@@ -156,7 +160,7 @@ namespace dlib { namespace ffmpeg { namespace details
         }
     }
 
-#if FF_API_OLD_CHANNEL_LAYOUT
+#if FFMPEG_HAS_CH_LAYOUT
 
     inline AVChannelLayout convert_layout(const uint64_t channel_layout)
     {

dlib/media/ffmpeg_muxer.h

@@ -788,7 +788,7 @@ namespace dlib
                     }
                 }
 
-#if FF_API_OLD_CHANNEL_LAYOUT
+#if FFMPEG_HAS_CH_LAYOUT
                 if (pCodec->ch_layouts)
                 {
                     bool channel_layout_supported = false;

dlib/media/ffmpeg_utils.h

@@ -775,7 +775,7 @@ namespace dlib
                     if (std::tie(src_sample_rate, src_channel_layout, src_fmt) !=
                         std::tie(dst_sample_rate, dst_channel_layout, dst_fmt))
                     {
-#if FF_API_OLD_CHANNEL_LAYOUT
+#if LIBSWRESAMPLE_VERSION_INT >= AV_VERSION_INT(4, 5, 100) 
                         AVChannelLayout layout_src = convert_layout(src_channel_layout);
                         AVChannelLayout layout_dst = convert_layout(dst_channel_layout);