Add configuration to stream, H264 support, codec selection

components/codecs/include/ftl/codecs/h264.hpp

+#ifndef _FTL_CODECS_H264_HPP_
+#define _FTL_CODECS_H264_HPP_
+
+namespace ftl {
+namespace codecs {
+
+/**
+ * H.264 codec utility functions.
+ */
+namespace h264 {
+
+/**
+ * H264 Network Abstraction Layer Unit types.
+ */
+enum class NALType : int {
+	UNSPECIFIED_0 = 0,
+	CODED_SLICE_NON_IDR = 1,
+	CODED_SLICE_PART_A = 2,
+	CODED_SLICE_PART_B = 3,
+	CODED_SLICE_PART_C = 4,
+	CODED_SLICE_IDR = 5,
+	SEI = 6,
+	SPS = 7,
+	PPS = 8,
+	ACCESS_DELIMITER = 9,
+	EO_SEQ = 10,
+	EO_STREAM = 11,
+	FILTER_DATA = 12,
+	SPS_EXT = 13,
+	PREFIX_NAL_UNIT = 14,
+	SUBSET_SPS = 15,
+	RESERVED_16 = 16,
+	RESERVED_17 = 17,
+	RESERVED_18 = 18,
+	CODED_SLICE_AUX = 19,
+	CODED_SLICE_EXT = 20,
+	CODED_SLICE_DEPTH = 21,
+	RESERVED_22 = 22,
+	RESERVED_23 = 23,
+	UNSPECIFIED_24 = 24,
+	UNSPECIFIED_25,
+	UNSPECIFIED_26,
+	UNSPECIFIED_27,
+	UNSPECIFIED_28,
+	UNSPECIFIED_29,
+	UNSPECIFIED_30,
+	UNSPECIFIED_31
+};
+
+/**
+ * Extract the NAL unit type from the first NAL header.
+ * With NvPipe, the 5th byte contains the NAL Unit header.
+ */
+inline NALType getNALType(const std::vector<uint8_t> &data) {
+	return static_cast<NALType>(data[4] & 0x1F);
+}
+
+/**
+ * Check the H264 bitstream for an I-Frame. With NvPipe, all I-Frames start
+ * with a SPS NAL unit so just check for this.
+ */
+inline bool isIFrame(const std::vector<uint8_t> &data) {
+	return getNALType(data) == NALType::SPS;
+}
+
+}
+}
+}
+
+#endif  // _FTL_CODECS_H264_HPP_