// license:BSD-3-Clause // copyright-holders:Aaron Giles /*************************************************************************** avhuff.h Audio/video compression and decompression helpers. ***************************************************************************/ #pragma once #ifndef __AVHUFF_H__ #define __AVHUFF_H__ #include "osdcore.h" #include "coretmpl.h" #include "bitmap.h" #include "huffman.h" #include "flac.h" //************************************************************************** // CONSTANTS //************************************************************************** #define AVHUFF_USE_FLAC (1) // errors enum avhuff_error { AVHERR_NONE = 0, AVHERR_INVALID_DATA, AVHERR_VIDEO_TOO_LARGE, AVHERR_AUDIO_TOO_LARGE, AVHERR_METADATA_TOO_LARGE, AVHERR_OUT_OF_MEMORY, AVHERR_COMPRESSION_ERROR, AVHERR_TOO_MANY_CHANNELS, AVHERR_INVALID_CONFIGURATION, AVHERR_INVALID_PARAMETER, AVHERR_BUFFER_TOO_SMALL }; //************************************************************************** // TYPE DEFINITIONS //************************************************************************** // ======================> av_codec_decompress_config // decompression configuration class avhuff_decompress_config { public: avhuff_decompress_config() : maxsamples(0), actsamples(nullptr), maxmetalength(0), actmetalength(nullptr), metadata(nullptr) { memset(audio, 0, sizeof(audio)); } bitmap_yuy16 video; // pointer to video bitmap UINT32 maxsamples; // maximum number of samples per channel UINT32 * actsamples; // actual number of samples per channel INT16 * audio[16]; // pointer to individual audio channels UINT32 maxmetalength; // maximum length of metadata UINT32 * actmetalength; // actual length of metadata UINT8 * metadata; // pointer to metadata buffer }; // ======================> avhuff_encoder // core state for the codec class avhuff_encoder { public: // construction/destruction avhuff_encoder(); // encode/decode avhuff_error encode_data(const UINT8 *source, UINT8 *dest, UINT32 &complength); // static helpers static UINT32 raw_data_size(const UINT8 *data); static UINT32 raw_data_size(UINT32 width, UINT32 height, UINT8 channels, UINT32 numsamples, UINT32 metadatasize = 0) { return 12 + channels * numsamples * 2 + width * height * 2; } static avhuff_error assemble_data(dynamic_buffer &buffer, bitmap_yuy16 &bitmap, UINT8 channels, UINT32 numsamples, INT16 **samples, UINT8 *metadata = nullptr, UINT32 metadatasize = 0); private: // delta-RLE Huffman encoder class deltarle_encoder { public: // construction/destruction deltarle_encoder() : m_rlecount(0) { } // histogramming UINT16 *rle_and_histo_bitmap(const UINT8 *source, UINT32 items_per_row, UINT32 item_advance, UINT32 row_count); // encoding void flush_rle() { m_rlecount = 0; } void encode_one(bitstream_out &bitbuf, UINT16 *&rleptr); huffman_error export_tree_rle(bitstream_out &bitbuf) { return m_encoder.export_tree_rle(bitbuf); } private: // internal state int m_rlecount; huffman_encoder<256 + 16> m_encoder; std::vector m_rlebuffer; }; // internal helpers avhuff_error encode_audio(const UINT8 *source, int channels, int samples, UINT8 *dest, UINT8 *sizes); avhuff_error encode_video(const UINT8 *source, int width, int height, UINT8 *dest, UINT32 &complength); avhuff_error encode_video_lossless(const UINT8 *source, int width, int height, UINT8 *dest, UINT32 &complength); // video encoding contexts deltarle_encoder m_ycontext; deltarle_encoder m_cbcontext; deltarle_encoder m_crcontext; // audio encoding contexts dynamic_buffer m_audiobuffer; #if AVHUFF_USE_FLAC flac_encoder m_flac_encoder; #else huffman_8bit_encoder m_audiohi_encoder; huffman_8bit_encoder m_audiolo_encoder; #endif }; // ======================> avhuff_decoder // core state for the codec class avhuff_decoder { public: // construction/destruction avhuff_decoder(); // configuration void configure(const avhuff_decompress_config &config); // encode/decode avhuff_error decode_data(const UINT8 *source, UINT32 complength, UINT8 *dest); private: // delta-RLE Huffman decoder class deltarle_decoder { public: // construction/destruction deltarle_decoder() : m_rlecount(0), m_prevdata(0) { } // general void reset() { m_rlecount = m_prevdata = 0; } // decoding void flush_rle() { m_rlecount = 0; } UINT32 decode_one(bitstream_in &bitbuf); huffman_error import_tree_rle(bitstream_in &bitbuf) { return m_decoder.import_tree_rle(bitbuf); } private: // internal state int m_rlecount; UINT8 m_prevdata; huffman_decoder<256 + 16> m_decoder; }; // internal helpers avhuff_error decode_audio(int channels, int samples, const UINT8 *source, UINT8 **dest, UINT32 dxor, const UINT8 *sizes); avhuff_error decode_video(int width, int height, const UINT8 *source, UINT32 complength, UINT8 *dest, UINT32 dstride, UINT32 dxor); avhuff_error decode_video_lossless(int width, int height, const UINT8 *source, UINT32 complength, UINT8 *dest, UINT32 dstride, UINT32 dxor); // internal state avhuff_decompress_config m_config; // video decoding contexts deltarle_decoder m_ycontext; deltarle_decoder m_cbcontext; deltarle_decoder m_crcontext; // audio decoding contexts huffman_8bit_decoder m_audiohi_decoder; huffman_8bit_decoder m_audiolo_decoder; #if AVHUFF_USE_FLAC flac_decoder m_flac_decoder; #endif }; #endif