* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
-#ifndef FFMPEG_MLP_H
-#define FFMPEG_MLP_H
+#ifndef AVCODEC_MLP_H
+#define AVCODEC_MLP_H
#include <stdint.h>
/** Maximum number of matrices used in decoding; most streams have one matrix
* per output channel, but some rematrix a channel (usually 0) more than once.
*/
-
#define MAX_MATRICES 15
/** Maximum number of substreams that can be decoded. This could also be set
- * higher, but I haven't seen any examples with more than two. */
+ * higher, but I haven't seen any examples with more than two.
+ */
#define MAX_SUBSTREAMS 2
/** maximum sample frequency seen in files */
/** The maximum number of taps in either the IIR or FIR filter;
* I believe MLP actually specifies the maximum order for IIR filters as four,
- * and that the sum of the orders of both filters must be <= 8. */
+ * and that the sum of the orders of both filters must be <= 8.
+*/
#define MAX_FILTER_ORDER 8
+/** Code that signals end of a stream. */
+#define END_OF_STREAM 0xd234d234
+
#define FIR 0
#define IIR 1
/** Tables defining the Huffman codes.
* There are three entropy coding methods used in MLP (four if you count
* "none" as a method). These use the same sequences for codes starting with
- * 00 or 01, but have different codes starting with 1. */
-
+ * 00 or 01, but have different codes starting with 1.
+ */
extern const uint8_t ff_mlp_huffman_tables[3][18][2];
/** MLP uses checksums that seem to be based on the standard CRC algorithm, but
* are not (in implementation terms, the table lookup and XOR are reversed).
* We can implement this behavior using a standard av_crc on all but the
- * last element, then XOR that with the last element. */
-
+ * last element, then XOR that with the last element.
+ */
uint8_t ff_mlp_checksum8 (const uint8_t *buf, unsigned int buf_size);
uint16_t ff_mlp_checksum16(const uint8_t *buf, unsigned int buf_size);
/** Calculate an 8-bit checksum over a restart header -- a non-multiple-of-8
- * number of bits, starting two bits into the first byte of buf. */
-
+ * number of bits, starting two bits into the first byte of buf.
+ */
uint8_t ff_mlp_restart_checksum(const uint8_t *buf, unsigned int bit_size);
/** XOR together all the bytes of a buffer.
- * Does this belong in dspcontext? */
-
+ * Does this belong in dspcontext?
+ */
uint8_t ff_mlp_calculate_parity(const uint8_t *buf, unsigned int buf_size);
-int ff_mlp_init_crc2D(AVCodecParserContext *s);
-
void ff_mlp_init_crc();
-#endif /* FFMPEG_MLP_H */
+/** XOR four bytes into one. */
+static inline uint8_t xor_32_to_8(uint32_t value)
+{
+ value ^= value >> 16;
+ value ^= value >> 8;
+ return value;
+}
+
+#endif /* AVCODEC_MLP_H */