Define AVCPP_API_AVBUFFER_SIZE_T when AVBuffer API switched to size_t

...from int. It affect other APIs lie av_packet_get_side_data().

Author: h4tr3d

src/avcompat.h

@@ -44,6 +44,8 @@ extern "C" {
 #define AVCPP_API_AVCODEC_GET_SUPPORTED_CONFIG (AVCPP_AVCODEC_VERSION_INT >= AV_VERSION_INT(61, 13, 100))
 // av_stream_get_codec_timebase() deprecard now without replacement
 #define AVCPP_API_AVFORMAT_AV_STREAM_GET_CODEC_TIMEBASE (AVCPP_AVFORMAT_VERSION_INT < AV_VERSION_INT(61, 5, 101))
+// AVBuffer API switch to size_t
+#define AVCPP_API_AVBUFFER_SIZE_T (AVCPP_AVUTIL_VERSION_MAJOR >= 57)
 
 #if defined(__ICL) || defined (__INTEL_COMPILER)
 #    define FF_DISABLE_DEPRECATION_WARNINGS __pragma(warning(push)) __pragma(warning(disable:1478))

src/packet.cpp

@@ -367,18 +367,20 @@ void Packet::setTimeBase(const Rational &tb)
 }
 
 #if AVCPP_HAS_PKT_SIDE_DATA
+using SideDataSize_t = std::conditional_t<AVCPP_API_AVBUFFER_SIZE_T, std::size_t, int>;
+
 std::span<const uint8_t> Packet::sideData(AVPacketSideDataType type) const
 {
-    std::size_t size;
+    SideDataSize_t size;
     auto const data = av_packet_get_side_data(raw(), type, &size);
-    return data ? std::span<const uint8_t>{} : std::span<const uint8_t>{data, size};
+    return data ? std::span<const uint8_t>{} : std::span<const uint8_t>{data, std::size_t(size)};
 }
 
 std::span<uint8_t> Packet::sideData(AVPacketSideDataType type)
 {
-    std::size_t size;
+    SideDataSize_t size;
     auto const data = av_packet_get_side_data(raw(), type, &size);
-    return data ? std::span<uint8_t>{} : std::span<uint8_t>{data, size};
+    return data ? std::span<uint8_t>{} : std::span<uint8_t>{data, std::size_t(size)};
 }
 
 PacketSideData Packet::sideData(std::size_t index) noexcept
@@ -571,12 +573,12 @@ AVPacketSideDataType PacketSideData::type() const noexcept
 
 std::span<const uint8_t> PacketSideData::data() const noexcept
 {
-    return {m_raw.data, m_raw.size};
+    return {m_raw.data, std::size_t(m_raw.size)};
 }
 
 std::span<uint8_t> PacketSideData::data() noexcept
 {
-    return {m_raw.data, m_raw.size};
+    return {m_raw.data, std::size_t(m_raw.size)};
 }
 
 bool PacketSideData::empty() const noexcept