Initial code for movie playback.

Makefile

@@ -2,7 +2,7 @@ include config.mk
 
 TARGET = ssnes tools/ssnes-joyconfig
 
-OBJ = ssnes.o file.o driver.o settings.o dynamic.o message.o rewind.o
+OBJ = ssnes.o file.o driver.o settings.o dynamic.o message.o rewind.o movie.o
 JOYCONFIG_OBJ = tools/ssnes-joyconfig.o conf/config_file.o
 HEADERS = $(wildcard */*.h) $(wildcard *.h)
 

general.h

@@ -115,6 +115,7 @@ struct global
 
    FILE *rom_file;
    enum ssnes_game_type game_type;
+   uint32_t cart_crc;
 
    char gb_rom_path[256];
    char bsx_rom_path[256];

movie.c

@@ -0,0 +1,243 @@
+/*  SSNES - A Super Nintendo Entertainment System (SNES) Emulator frontend for libsnes.
+ *  Copyright (C) 2010-2011 - Hans-Kristian Arntzen
+ *
+ *  Some code herein may be based on code found in BSNES.
+ * 
+ *  SSNES is free software: you can redistribute it and/or modify it under the terms
+ *  of the GNU General Public License as published by the Free Software Found-
+ *  ation, either version 3 of the License, or (at your option) any later version.
+ *
+ *  SSNES 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 General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with SSNES.
+ *  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "movie.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include "general.h"
+#include "dynamic.h"
+
+// CRC32 implementation taken from BSNES source :)
+
+static const uint32_t crc32_table[256] = {
+    0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
+    0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
+    0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
+    0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
+    0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
+    0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
+    0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
+    0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
+    0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
+    0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
+    0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
+    0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
+    0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
+    0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
+    0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
+    0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
+    0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
+    0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
+    0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
+    0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
+    0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
+    0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
+    0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
+    0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
+    0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
+    0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
+    0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
+    0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
+    0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
+    0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
+    0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
+    0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
+    0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
+    0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
+    0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
+    0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
+    0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
+    0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
+    0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
+    0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
+    0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
+    0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
+    0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
+};
+
+
+static inline uint32_t crc32_adjust(uint32_t crc32, uint8_t input)
+{
+   return ((crc32 >> 8) & 0x00ffffff) ^ crc32_table[(crc32 ^ input) & 0xff];
+}
+
+uint32_t crc32_calculate(const uint8_t *data, unsigned length)
+{
+   uint32_t crc32 = ~0;
+   for(unsigned i = 0; i < length; i++)
+      crc32 = crc32_adjust(crc32, data[i]);
+   return ~crc32;
+}
+
+struct bsv_movie
+{
+   FILE *file;
+   uint8_t *state;
+};
+
+#define BSV_MAGIC 0x42535631
+
+#define MAGIC_INDEX 0
+#define SERIALIZER_INDEX 1
+#define CRC_INDEX 2
+#define STATE_SIZE_INDEX 3
+
+static inline uint8_t is_little_endian(void)
+{
+   union
+   {
+      uint16_t u16;
+      uint8_t u8[2];
+   } u;
+
+   u.u16 = 1;
+   return u.u8[0];
+}
+
+// Convert to big-endian if needed
+static inline uint32_t swap_if_big32(uint32_t val)
+{
+   if (is_little_endian()) // Little-endian
+      return val;
+   else
+      return (val >> 24) | ((val >> 8) & 0xFF00) | ((val << 8) & 0xFF0000) | (val << 24);
+}
+
+static inline uint16_t swap_if_big16(uint16_t val)
+{
+   if (is_little_endian())
+      return val;
+   else
+      return (val >> 8) | (val << 8);
+}
+
+static bool init_playback(bsv_movie_t *handle, const char *path)
+{
+   handle->file = fopen(path, "rb");
+   if (!handle->file)
+   {
+      SSNES_ERR("Couldn't open BSV file \"%s\" for playback.\n", path);
+      return false;
+   }
+
+   uint32_t header[4] = {0};
+   if (fread(header, 4, sizeof(uint32_t), handle->file) != 4)
+   {
+      SSNES_ERR("Couldn't read movie header!\n");
+      return false;
+   }
+
+   if (swap_if_big32(header[MAGIC_INDEX]) != BSV_MAGIC)
+   {
+      SSNES_ERR("Movie file is not a valid BSV1 file!\n");
+      return false;
+   }
+
+   if (swap_if_big32(header[CRC_INDEX]) != g_extern.cart_crc)
+   {
+      SSNES_ERR("Cart CRC32s differ! Cannot play back!\n");
+      return false;
+   }
+
+   uint32_t state_size = swap_if_big32(header[STATE_SIZE_INDEX]);
+   handle->state = malloc(state_size);
+   if (!handle->state)
+      return false;
+
+   if (fread(handle->state, 1, state_size, handle->file) != state_size)
+   {
+      SSNES_ERR("Couldn't read state from movie.\n");
+      return false;
+   }
+
+   // Unserialize to start playback.
+   psnes_unserialize(handle->state, state_size);
+   return true;
+}
+
+static bool init_record(bsv_movie_t *handle, const char *path)
+{
+   handle->file = fopen(path, "wb");
+   if (!handle->file)
+   {
+      SSNES_ERR("Couldn't open BSV \"%s\" for recording.\n", path);
+      return false;
+   }
+
+   uint32_t header[4] = {0};
+   header[MAGIC_INDEX] = swap_if_big32(BSV_MAGIC);
+   //header[SERIALIZER_INDEX] = 0; // TODO: Fix this.
+   header[CRC_INDEX] = swap_if_big32(g_extern.cart_crc);
+
+   uint32_t state_size = psnes_serialize_size();
+   header[STATE_SIZE_INDEX] = swap_if_big32(state_size);
+   fwrite(header, 4, sizeof(uint32_t), handle->file);
+
+   handle->state = malloc(state_size);
+   if (!handle->state)
+      return false;
+
+   psnes_serialize(handle->state, state_size);
+   fwrite(handle->state, 1, state_size, handle->file);
+   return true;
+}
+
+void bsv_movie_free(bsv_movie_t *handle)
+{
+   if (handle)
+   {
+      if (handle->file)
+         fclose(handle->file);
+      free(handle->state);
+      free(handle);
+   }
+}
+
+bool bsv_movie_get_input(bsv_movie_t *handle, int16_t *input)
+{
+   if (fread(input, 1, sizeof(int16_t), handle->file) != 1)
+      return false;
+
+   *input = swap_if_big16(*input);
+   return true;
+}
+
+void bsv_movie_set_input(bsv_movie_t *handle, int16_t input)
+{
+   fwrite(&input, 1, sizeof(int16_t), handle->file);
+}
+
+bsv_movie_t *bsv_movie_init(const char *path, enum ssnes_movie_type type)
+{
+   bsv_movie_t *handle = calloc(1, sizeof(*handle));
+   if (!handle)
+      return NULL;
+
+   if (type == SSNES_MOVIE_PLAYBACK)
+   {
+      if (!init_playback(handle, path))
+         goto error;
+   }
+   else if (!init_record(handle, path))
+      goto error;
+
+   return handle;
+
+error:
+   bsv_movie_free(handle);
+   return NULL;
+}

movie.h

@@ -0,0 +1,48 @@
+/*  SSNES - A Super Nintendo Entertainment System (SNES) Emulator frontend for libsnes.
+ *  Copyright (C) 2010-2011 - Hans-Kristian Arntzen
+ *
+ *  Some code herein may be based on code found in BSNES.
+ * 
+ *  SSNES is free software: you can redistribute it and/or modify it under the terms
+ *  of the GNU General Public License as published by the Free Software Found-
+ *  ation, either version 3 of the License, or (at your option) any later version.
+ *
+ *  SSNES 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 General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with SSNES.
+ *  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __SSNES_MOVIE_H
+#define __SSNES_MOVIE_H
+
+#include <stdint.h>
+#include <stdbool.h>
+
+typedef struct bsv_movie bsv_movie_t;
+
+enum ssnes_movie_type
+{
+   SSNES_MOVIE_PLAYBACK,
+   SSNES_MOVIE_RECORD,
+};
+
+bsv_movie_t *bsv_movie_init(const char *path, enum ssnes_movie_type type);
+
+// Playback
+bool bsv_movie_get_input(bsv_movie_t *handle, int16_t *input);
+
+// Recording
+void bsv_movie_set_input(bsv_movie_t *handle, int16_t input);
+
+void bsv_movie_free(bsv_movie_t *handle);
+
+uint32_t crc32_calculate(const uint8_t *data, unsigned length);
+
+
+
+
+#endif
+

ssnes.c

@@ -645,9 +645,9 @@ static void init_rewind(void)
 {
    if (g_settings.rewind_enable)
    {
-      size_t serial_size = snes_serialize_size();
+      size_t serial_size = psnes_serialize_size();
       g_extern.state_buf = malloc((serial_size + 3) & ~3); // Make sure we allocate at least 4-byte multiple.
-      snes_serialize(g_extern.state_buf, serial_size);
+      psnes_serialize(g_extern.state_buf, serial_size);
       SSNES_LOG("Initing rewind buffer with size: %u MB\n", (unsigned)g_settings.rewind_buffer_size / 1000000);
       g_extern.state_manager = state_manager_new((serial_size + 3) & ~3, g_settings.rewind_buffer_size, g_extern.state_buf);
       if (!g_extern.state_manager)
@@ -822,7 +822,7 @@ static void check_rewind(void)
       if (state_manager_pop(g_extern.state_manager, &buf))
       {
          msg_queue_push(g_extern.msg_queue, "Rewinding!", 0, 30);
-         snes_unserialize(buf, snes_serialize_size());
+         psnes_unserialize(buf, psnes_serialize_size());
          g_extern.frame_is_reverse = true;
       }
       else
@@ -834,7 +834,7 @@ static void check_rewind(void)
       cnt = (cnt + 1) % (g_settings.rewind_granularity ? g_settings.rewind_granularity : 1); // Avoid possible SIGFPE.
       if (cnt == 0)
       {
-         snes_serialize(g_extern.state_buf, snes_serialize_size());
+         psnes_serialize(g_extern.state_buf, psnes_serialize_size());
          state_manager_push(g_extern.state_manager, g_extern.state_buf);
       }
    }