+static int dca_parse_params(const uint8_t *buf, int buf_size, int *duration,
+ int *sample_rate, int *framesize)
+{
+ GetBitContext gb;
+ uint8_t hdr[12 + FF_INPUT_BUFFER_PADDING_SIZE] = { 0 };
+ int ret, sample_blocks, sr_code;
+
+ if (buf_size < 12)
+ return AVERROR_INVALIDDATA;
+
+ if ((ret = ff_dca_convert_bitstream(buf, 12, hdr, 12)) < 0)
+ return ret;
+
+ init_get_bits(&gb, hdr, 96);
+
+ skip_bits_long(&gb, 39);
+ sample_blocks = get_bits(&gb, 7) + 1;
+ if (sample_blocks < 8)
+ return AVERROR_INVALIDDATA;
+ *duration = 256 * (sample_blocks / 8);
+
+ *framesize = get_bits(&gb, 14) + 1;
+ if (*framesize < 95)
+ return AVERROR_INVALIDDATA;
+
+ skip_bits(&gb, 6);
+ sr_code = get_bits(&gb, 4);
+ *sample_rate = avpriv_dca_sample_rates[sr_code];
+ if (*sample_rate == 0)
+ return AVERROR_INVALIDDATA;
+
+ return 0;
+}
+