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393 lines
12 KiB
C
393 lines
12 KiB
C
/* SSNES - A Super Nintendo Entertainment System (SNES) Emulator frontend for libsnes.
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* Copyright (C) 2010-2012 - Hans-Kristian Arntzen
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*
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* Some code herein may be based on code found in BSNES.
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*
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* SSNES is free software: you can redistribute it and/or modify it under the terms
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* of the GNU General Public License as published by the Free Software Found-
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* ation, either version 3 of the License, or (at your option) any later version.
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*
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* SSNES is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with SSNES.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "movie.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "general.h"
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#include "dynamic.h"
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// CRC32 implementation taken from BSNES source :)
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static const uint32_t crc32_table[256] = {
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0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
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0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
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0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
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0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
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0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
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0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
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0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
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0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
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0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
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0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
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0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
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0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
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0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
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0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
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0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
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0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
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0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
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0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
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0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
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0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
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0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
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0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
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0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
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0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
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0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
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0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
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0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
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0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
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0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
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0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
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0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
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0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
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0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
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0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
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0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
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0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
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0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
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0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
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0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
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0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
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0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
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0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
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0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
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};
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uint32_t crc32_adjust(uint32_t crc32, uint8_t input)
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{
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return ((crc32 >> 8) & 0x00ffffff) ^ crc32_table[(crc32 ^ input) & 0xff];
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}
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uint32_t crc32_calculate(const uint8_t *data, unsigned length)
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{
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uint32_t crc32 = ~0;
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for (unsigned i = 0; i < length; i++)
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crc32 = crc32_adjust(crc32, data[i]);
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return ~crc32;
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}
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struct bsv_movie
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{
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FILE *file;
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uint8_t *state;
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size_t *frame_pos; // A ring buffer keeping track of positions in the file for each frame.
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size_t frame_mask;
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size_t frame_ptr;
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bool playback;
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size_t min_file_pos;
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bool first_rewind;
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bool did_rewind;
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};
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#define BSV_MAGIC 0x42535631
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#define MAGIC_INDEX 0
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#define SERIALIZER_INDEX 1
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#define CRC_INDEX 2
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#define STATE_SIZE_INDEX 3
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// Convert to big-endian if needed
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static inline uint32_t swap_if_big32(uint32_t val)
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{
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if (is_little_endian()) // Little-endian
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return val;
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else
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return (val >> 24) | ((val >> 8) & 0xFF00) | ((val << 8) & 0xFF0000) | (val << 24);
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}
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static inline uint32_t swap_if_little32(uint32_t val)
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{
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if (!is_little_endian()) // Big-endian
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return val;
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else
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return (val >> 24) | ((val >> 8) & 0xFF00) | ((val << 8) & 0xFF0000) | (val << 24);
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}
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static inline uint16_t swap_if_big16(uint16_t val)
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{
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if (is_little_endian())
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return val;
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else
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return (val >> 8) | (val << 8);
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}
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static bool init_playback(bsv_movie_t *handle, const char *path)
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{
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handle->playback = true;
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handle->file = fopen(path, "rb");
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if (!handle->file)
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{
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SSNES_ERR("Couldn't open BSV file \"%s\" for playback.\n", path);
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return false;
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}
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uint32_t header[4] = {0};
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if (fread(header, sizeof(uint32_t), 4, handle->file) != 4)
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{
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SSNES_ERR("Couldn't read movie header!\n");
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return false;
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}
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// Compatibility with old implementation that used incorrect documentation.
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if (swap_if_little32(header[MAGIC_INDEX]) != BSV_MAGIC && swap_if_big32(header[MAGIC_INDEX]) != BSV_MAGIC)
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{
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SSNES_ERR("Movie file is not a valid BSV1 file!\n");
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return false;
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}
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if (swap_if_big32(header[CRC_INDEX]) != g_extern.cart_crc)
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{
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SSNES_ERR("Cart CRC32s differ! Cannot play back!\n");
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return false;
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}
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uint32_t state_size = swap_if_big32(header[STATE_SIZE_INDEX]);
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// If we're playing back from the start, state_size is 0.
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if (state_size)
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{
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handle->state = (uint8_t*)malloc(state_size);
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if (!handle->state)
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return false;
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if (fread(handle->state, 1, state_size, handle->file) != state_size)
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{
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SSNES_ERR("Couldn't read state from movie.\n");
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return false;
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}
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if (psnes_serialize_size() != state_size)
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{
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SSNES_ERR("Movie format seems to have a different serializer version. Cannot continue.\n");
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ssnes_fail(1, "init_playback()");
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}
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// Unserialize to start playback.
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psnes_unserialize(handle->state, state_size);
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}
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handle->min_file_pos = sizeof(header) + state_size;
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return true;
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}
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static bool init_record(bsv_movie_t *handle, const char *path)
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{
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handle->file = fopen(path, "wb");
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if (!handle->file)
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{
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SSNES_ERR("Couldn't open BSV \"%s\" for recording.\n", path);
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return false;
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}
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uint32_t header[4] = {0};
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// This value is supposed to show up as BSV1 in a HEX editor.
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header[MAGIC_INDEX] = swap_if_little32(BSV_MAGIC);
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header[CRC_INDEX] = swap_if_big32(g_extern.cart_crc);
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uint32_t state_size = psnes_serialize_size();
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header[STATE_SIZE_INDEX] = swap_if_big32(state_size);
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fwrite(header, 4, sizeof(uint32_t), handle->file);
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handle->state = (uint8_t*)malloc(state_size);
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if (!handle->state)
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return false;
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handle->min_file_pos = sizeof(header) + state_size;
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if (state_size > 0)
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{
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psnes_serialize(handle->state, state_size);
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fwrite(handle->state, 1, state_size, handle->file);
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}
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return true;
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}
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void bsv_movie_free(bsv_movie_t *handle)
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{
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if (handle)
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{
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if (handle->file)
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fclose(handle->file);
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free(handle->state);
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free(handle->frame_pos);
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free(handle);
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}
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}
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bool bsv_movie_get_input(bsv_movie_t *handle, int16_t *input)
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{
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if (fread(input, sizeof(int16_t), 1, handle->file) != 1)
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return false;
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*input = swap_if_big16(*input);
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return true;
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}
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void bsv_movie_set_input(bsv_movie_t *handle, int16_t input)
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{
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input = swap_if_big16(input);
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fwrite(&input, sizeof(int16_t), 1, handle->file);
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}
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bsv_movie_t *bsv_movie_init(const char *path, enum ssnes_movie_type type)
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{
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bsv_movie_t *handle = (bsv_movie_t*)calloc(1, sizeof(*handle));
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if (!handle)
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return NULL;
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if (type == SSNES_MOVIE_PLAYBACK)
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{
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if (!init_playback(handle, path))
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goto error;
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}
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else if (!init_record(handle, path))
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goto error;
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// Just pick something really large :D ~1 million frames rewind should do the trick.
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if (!(handle->frame_pos = (size_t*)calloc((1 << 20), sizeof(size_t))))
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goto error;
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handle->frame_pos[0] = handle->min_file_pos;
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handle->frame_mask = (1 << 20) - 1;
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return handle;
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error:
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bsv_movie_free(handle);
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return NULL;
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}
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void bsv_movie_set_frame_start(bsv_movie_t *handle)
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{
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handle->frame_pos[handle->frame_ptr] = ftell(handle->file);
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}
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void bsv_movie_set_frame_end(bsv_movie_t *handle)
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{
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handle->frame_ptr = (handle->frame_ptr + 1) & handle->frame_mask;
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handle->first_rewind = !handle->did_rewind;
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handle->did_rewind = false;
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}
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void bsv_movie_frame_rewind(bsv_movie_t *handle)
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{
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handle->did_rewind = true;
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// If we're at the beginning ... :)
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if ((handle->frame_ptr <= 1) && (handle->frame_pos[0] == handle->min_file_pos))
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{
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handle->frame_ptr = 0;
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fseek(handle->file, handle->min_file_pos, SEEK_SET);
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}
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else
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{
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// First time rewind is performed, the old frame is simply replayed.
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// However, playing back that frame caused us to read data, and push data to the ring buffer.
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// Sucessively rewinding frames, we need to rewind past the read data, plus another.
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handle->frame_ptr = (handle->frame_ptr - (handle->first_rewind ? 1 : 2)) & handle->frame_mask;
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fseek(handle->file, handle->frame_pos[handle->frame_ptr], SEEK_SET);
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}
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// We rewound past the beginning. :O
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if (ftell(handle->file) <= (long)handle->min_file_pos)
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{
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// If recording, we simply reset the starting point. Nice and easy.
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if (!handle->playback)
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{
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fseek(handle->file, 4 * sizeof(uint32_t), SEEK_SET);
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psnes_serialize(handle->state, psnes_serialize_size());
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fwrite(handle->state, 1, psnes_serialize_size(), handle->file);
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}
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else
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fseek(handle->file, handle->min_file_pos, SEEK_SET);
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}
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}
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uint32_t *bsv_header_generate(size_t *size, uint32_t magic)
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{
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uint32_t bsv_header[4] = {0};
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unsigned serialize_size = psnes_serialize_size();
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size_t header_size = sizeof(bsv_header) + serialize_size;
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*size = header_size;
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uint32_t *header = (uint32_t*)malloc(header_size);
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if (!header)
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return NULL;
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bsv_header[MAGIC_INDEX] = swap_if_little32(BSV_MAGIC);
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bsv_header[SERIALIZER_INDEX] = swap_if_big32(magic);
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bsv_header[CRC_INDEX] = swap_if_big32(g_extern.cart_crc);
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bsv_header[STATE_SIZE_INDEX] = swap_if_big32(serialize_size);
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if (serialize_size && !psnes_serialize((uint8_t*)header + sizeof(bsv_header), serialize_size))
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{
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free(header);
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return NULL;
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}
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memcpy(header, bsv_header, sizeof(bsv_header));
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return header;
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}
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bool bsv_parse_header(const uint32_t *header, uint32_t magic)
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{
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uint32_t in_bsv = swap_if_little32(header[MAGIC_INDEX]);
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if (in_bsv != BSV_MAGIC)
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{
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SSNES_ERR("BSV magic mismatch, got 0x%x, expected 0x%x!\n",
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in_bsv, BSV_MAGIC);
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return false;
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}
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uint32_t in_magic = swap_if_big32(header[SERIALIZER_INDEX]);
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if (in_magic != magic)
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{
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SSNES_ERR("Magic mismatch, got 0x%x, expected 0x%x!\n", in_magic, magic);
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return false;
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}
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uint32_t in_crc = swap_if_big32(header[CRC_INDEX]);
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if (in_crc != g_extern.cart_crc)
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{
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SSNES_ERR("CRC32 mismatch, got 0x%x, expected 0x%x!\n", in_crc, g_extern.cart_crc);
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return false;
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}
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uint32_t in_state_size = swap_if_big32(header[STATE_SIZE_INDEX]);
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if (in_state_size != psnes_serialize_size())
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{
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SSNES_ERR("Serialization size mismatch, got 0x%x, expected 0x%x!\n",
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in_state_size, psnes_serialize_size());
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return false;
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}
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return true;
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}
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