/*
* Vidvox Hap
* Copyright (C) 2015 Vittorio Giovara <vittorio.giovara@gmail.com>
* Copyright (C) 2015 Tom Butterworth <bangnoise@gmail.com>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVCODEC_HAP_H
#define AVCODEC_HAP_H
#include <stdint.h>
#include "libavutil/opt.h"
#include "bytestream.h"
#include "texturedsp.h"
enum HapTextureFormat {
HAP_FMT_RGBDXT1 = 0x0B,
HAP_FMT_RGBADXT5 = 0x0E,
HAP_FMT_YCOCGDXT5 = 0x0F,
HAP_FMT_RGTC1 = 0x01,
};
enum HapCompressor {
HAP_COMP_NONE = 0xA0,
HAP_COMP_SNAPPY = 0xB0,
HAP_COMP_COMPLEX = 0xC0,
};
enum HapSectionType {
HAP_ST_DECODE_INSTRUCTIONS = 0x01,
HAP_ST_COMPRESSOR_TABLE = 0x02,
HAP_ST_SIZE_TABLE = 0x03,
HAP_ST_OFFSET_TABLE = 0x04,
};
typedef struct HapChunk {
enum HapCompressor compressor;
int compressed_offset;
size_t compressed_size;
int uncompressed_offset;
size_t uncompressed_size;
} HapChunk;
typedef struct HapContext {
AVClass *class;
TextureDSPContext dxtc;
GetByteContext gbc;
enum HapTextureFormat opt_tex_fmt; /* Texture type (encoder only) */
int opt_chunk_count; /* User-requested chunk count (encoder only) */
int opt_compressor; /* User-requested compressor (encoder only) */
int chunk_count;
HapChunk *chunks;
int *chunk_results; /* Results from threaded operations */
int tex_rat; /* Compression ratio */
int tex_rat2; /* Compression ratio of the second texture */
const uint8_t *tex_data; /* Compressed texture */
uint8_t *tex_buf; /* Buffer for compressed texture */
size_t tex_size; /* Size of the compressed texture */
size_t max_snappy; /* Maximum compressed size for snappy buffer */
int slice_count; /* Number of slices for threaded operations */
int texture_count; /* 2 for HAQA, 1 for other version */
int texture_section_size; /* size of the part of the texture section (for HAPQA) */
int uncompress_pix_size; /* nb of byte / pixel for the target picture */
/* Pointer to the selected compress or decompress function */
int (*tex_fun)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
int (*tex_fun2)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
} HapContext;
/*
* Set the number of chunks in the frame. Returns 0 on success or an error if:
* - first_in_frame is 0 and the number of chunks has changed
* - any other error occurs
*/
int ff_hap_set_chunk_count(HapContext *ctx, int count, int first_in_frame);
/*
* Free resources associated with the context
*/
av_cold void ff_hap_free_context(HapContext *ctx);
/* The first three bytes are the size of the section past the header, or zero
* if the length is stored in the next long word. The fourth byte in the first
* long word indicates the type of the current section. */
int ff_hap_parse_section_header(GetByteContext *gbc, int *section_size,
enum HapSectionType *section_type);
#endif /* AVCODEC_HAP_H */