+ ub(8, preferred_transfer_characteristics);
+
+ return 0;
+}
+
+static int FUNC(sei_alpha_channel_info)(CodedBitstreamContext *ctx,
+ RWContext *rw,
+ H265RawSEIAlphaChannelInfo *current)
+{
+ int err, length;
+
+ HEADER("Alpha Channel Information");
+
+ flag(alpha_channel_cancel_flag);
+ if (!current->alpha_channel_cancel_flag) {
+ ub(3, alpha_channel_use_idc);
+ ub(3, alpha_channel_bit_depth_minus8);
+ length = current->alpha_channel_bit_depth_minus8 + 9;
+ ub(length, alpha_transparent_value);
+ ub(length, alpha_opaque_value);
+ flag(alpha_channel_incr_flag);
+ flag(alpha_channel_clip_flag);
+ if (current->alpha_channel_clip_flag)
+ flag(alpha_channel_clip_type_flag);
+ } else {
+ infer(alpha_channel_use_idc, 2);
+ infer(alpha_channel_incr_flag, 0);
+ infer(alpha_channel_clip_flag, 0);
+ }
+
+ return 0;
+}
+
+static int FUNC(payload_extension)(CodedBitstreamContext *ctx, RWContext *rw,
+ H265RawExtensionData *current, uint32_t payload_size,
+ int cur_pos)
+{
+ int err;
+ size_t byte_length, k;
+
+#ifdef READ
+ GetBitContext tmp;
+ int bits_left, payload_zero_bits;
+
+ if (!cbs_h265_payload_extension_present(rw, payload_size, cur_pos))
+ return 0;
+
+ bits_left = 8 * payload_size - cur_pos;
+ tmp = *rw;
+ if (bits_left > 8)
+ skip_bits_long(&tmp, bits_left - 8);
+ payload_zero_bits = get_bits(&tmp, FFMIN(bits_left, 8));
+ if (!payload_zero_bits)
+ return AVERROR_INVALIDDATA;
+ payload_zero_bits = ff_ctz(payload_zero_bits);
+ current->bit_length = bits_left - payload_zero_bits - 1;
+ allocate(current->data, (current->bit_length + 7) / 8);
+#endif
+
+ byte_length = (current->bit_length + 7) / 8;
+ for (k = 0; k < byte_length; k++) {
+ int length = FFMIN(current->bit_length - k * 8, 8);
+ xu(length, reserved_payload_extension_data, current->data[k],
+ 0, MAX_UINT_BITS(length), 0);
+ }