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/*! @file codebooks.h
*
* @brief Declaration of the routines for computing the encoding tables from a codebook.
* A codebooks contains the variable-length codes for coefficient magnitudes, runs
* of zeros, and special codewords that mark entropy codec locations in bitstream.
* The codebook is used to create tables and simplify entropy coding of signed values
* and runs of zeros.
*
* (C) Copyright 2018 GoPro Inc (http://gopro.com/).
*
* Licensed under either:
* - Apache License, Version 2.0, http://www.apache.org/licenses/LICENSE-2.0
* - MIT license, http://opensource.org/licenses/MIT
* at your option.
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef CODEBOOKS_H
#define CODEBOOKS_H
#ifdef __cplusplus
extern "C" {
#endif
/*!
Codeset data structure that is used by the encoder
*/
typedef struct encoder_codeset {
const char *title; //!< Identifying string for the codeset
const CODEBOOK *codebook; //!< Codebook for runs and magnitudes
uint32_t flags; //!< Encoding flags (see the codeset flags)
const MAGS_TABLE *mags_table; //!< Table for encoding coefficient magnitudes
const RUNS_TABLE *runs_table; //!< Table for encoding runs of zeros
} ENCODER_CODESET;
extern ENCODER_CODESET encoder_codeset_17;
CODEC_ERROR PrepareCodebooks(const gpr_allocator *allocator, ENCODER_CODESET *cs);
CODEC_ERROR ReleaseCodebooks(gpr_allocator *allocator, ENCODER_CODESET *cs);
CODEC_ERROR ComputeRunLengthCodeTable(const gpr_allocator *allocator,
RLV *input_codes, int input_length,
RLC *output_codes, int output_length);
CODEC_ERROR SortDecreasingRunLength(RLC *codebook, int length);
CODEC_ERROR FillRunLengthEncodingTable(RLC *codebook, int codebook_length,
RLC *table, int table_length);
CODEC_ERROR FillMagnitudeEncodingTable(const CODEBOOK *codebook, VLE *table, int size, uint32_t flags);
#ifdef __cplusplus
}
#endif
#endif // CODEBOOKS_H
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