RetroArch/driver.c

/*  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 "driver.h"
#include "general.h"
#include <stdio.h>
#include <string.h>
#include "hqflt/filters.h"
#include <assert.h>

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

static const audio_driver_t *audio_drivers[] = {
#ifdef HAVE_ALSA
   &audio_alsa,
#endif
#ifdef HAVE_OSS
   &audio_oss,
#endif
#ifdef HAVE_RSOUND
   &audio_rsound,
#endif
#ifdef HAVE_AL
   &audio_openal,
#endif
#ifdef HAVE_ROAR
   &audio_roar,
#endif
#ifdef HAVE_JACK
   &audio_jack,
#endif
#ifdef HAVE_SDL
   &audio_sdl,
#endif
};

static const video_driver_t *video_drivers[] = {
#ifdef HAVE_SDL
   &video_gl,
#endif
};

static const input_driver_t *input_drivers[] = {
#ifdef HAVE_SDL
   &input_sdl,
#endif
};

static void find_audio_driver(void)
{
   for (int i = 0; i < sizeof(audio_drivers) / sizeof(audio_driver_t*); i++)
   {
      if (strcasecmp(g_settings.audio.driver, audio_drivers[i]->ident) == 0)
      {
         driver.audio = audio_drivers[i];
         return;
      }
   }
   SSNES_ERR("Couldn't find any audio driver named \"%s\"\n", g_settings.audio.driver);
   fprintf(stderr, "Available audio drivers are:\n");
   for (int i = 0; i < sizeof(audio_drivers) / sizeof(audio_driver_t*); i++)
      fprintf(stderr, "\t%s\n", audio_drivers[i]->ident);

   exit(1);
}

static void find_video_driver(void)
{
   for (int i = 0; i < sizeof(video_drivers) / sizeof(video_driver_t*); i++)
   {
      if (strcasecmp(g_settings.video.driver, video_drivers[i]->ident) == 0)
      {
         driver.video = video_drivers[i];
         return;
      }
   }
   SSNES_ERR("Couldn't find any video driver named \"%s\"\n", g_settings.video.driver);
   fprintf(stderr, "Available video drivers are:\n");
   for (int i = 0; i < sizeof(video_drivers) / sizeof(video_driver_t*); i++)
      fprintf(stderr, "\t%s\n", video_drivers[i]->ident);

   exit(1);
}

static void find_input_driver(void)
{
   for (int i = 0; i < sizeof(input_drivers) / sizeof(input_driver_t*); i++)
   {
      if (strcasecmp(g_settings.input.driver, input_drivers[i]->ident) == 0)
      {
         driver.input = input_drivers[i];
         return;
      }
   }
   SSNES_ERR("Couldn't find any input driver named \"%s\"\n", g_settings.input.driver);
   fprintf(stderr, "Available input drivers are:\n");
   for (int i = 0; i < sizeof(input_drivers) / sizeof(input_driver_t*); i++)
      fprintf(stderr, "\t%s\n", video_drivers[i]->ident);

   exit(1);
}

void init_drivers(void)
{
   init_video_input();
   init_audio();
}

void uninit_drivers(void)
{
   uninit_video_input();
   uninit_audio();
}

#define AUDIO_CHUNK_SIZE_BLOCKING 64
#define AUDIO_CHUNK_SIZE_NONBLOCKING 2048 // So we don't get complete line-noise when fast-forwarding audio.
#define AUDIO_MAX_RATIO 16
void init_audio(void)
{
   if (!g_settings.audio.enable)
   {
      g_extern.audio_active = false;
      return;
   }

   find_audio_driver();

   g_extern.audio_data.block_chunk_size = AUDIO_CHUNK_SIZE_BLOCKING;
   g_extern.audio_data.nonblock_chunk_size = AUDIO_CHUNK_SIZE_NONBLOCKING;

   driver.audio_data = driver.audio->init(strlen(g_settings.audio.device) ? g_settings.audio.device : NULL, g_settings.audio.out_rate, g_settings.audio.latency);
   if ( driver.audio_data == NULL )
      g_extern.audio_active = false;

   if (g_extern.audio_active && driver.audio->use_float && driver.audio->use_float(driver.audio_data))
      g_extern.audio_data.use_float = true;

   if (!g_settings.audio.sync && g_extern.audio_active)
   {
      driver.audio->set_nonblock_state(driver.audio_data, true);
      g_extern.audio_data.chunk_size = g_extern.audio_data.nonblock_chunk_size;
   }
   else
      g_extern.audio_data.chunk_size = g_extern.audio_data.block_chunk_size;

   int err;
   g_extern.source = src_new(g_settings.audio.src_quality, 2, &err);
   if (!g_extern.source)
      g_extern.audio_active = false;

   size_t max_bufsamples = g_extern.audio_data.block_chunk_size > g_extern.audio_data.nonblock_chunk_size ?
      g_extern.audio_data.block_chunk_size : g_extern.audio_data.nonblock_chunk_size;

   assert(g_settings.audio.out_rate < g_settings.audio.in_rate * AUDIO_MAX_RATIO);
   assert((g_extern.audio_data.data = malloc(max_bufsamples * sizeof(float))));
   g_extern.audio_data.data_ptr = 0;
   assert((g_extern.audio_data.outsamples = malloc(max_bufsamples * sizeof(float) * AUDIO_MAX_RATIO)));
   assert((g_extern.audio_data.conv_outsamples = malloc(max_bufsamples * sizeof(int16_t) * AUDIO_MAX_RATIO)));
}

void uninit_audio(void)
{
   if (!g_settings.audio.enable)
   {
      g_extern.audio_active = false;
      return;
   }

   if ( driver.audio_data && driver.audio )
      driver.audio->free(driver.audio_data);

   if ( g_extern.source )
      src_delete(g_extern.source);

   free(g_extern.audio_data.data); g_extern.audio_data.data = NULL;
   free(g_extern.audio_data.outsamples); g_extern.audio_data.outsamples = NULL;
   free(g_extern.audio_data.conv_outsamples); g_extern.audio_data.conv_outsamples = NULL;
}

void init_video_input(void)
{
   int scale = 2;

   find_video_driver();
   find_input_driver();

   // We multiply scales with 2 to allow for hi-res games.
#if HAVE_FILTER
   switch (g_settings.video.filter)
   {
      case FILTER_HQ2X:
         scale = 4;
         break;
      case FILTER_HQ4X:
      case FILTER_NTSC:
         scale = 8;
         break;
      default:
         break;
   }
#endif

   video_info_t video = {
      .width = (g_settings.video.fullscreen) ? g_settings.video.fullscreen_x : (296 * g_settings.video.xscale),
      .height = (g_settings.video.fullscreen) ? g_settings.video.fullscreen_y : (224 * g_settings.video.yscale),
      .fullscreen = g_settings.video.fullscreen,
      .vsync = g_settings.video.vsync,
      .force_aspect = g_settings.video.force_aspect,
      .smooth = g_settings.video.smooth,
      .input_scale = scale,
   };

   const input_driver_t *tmp = driver.input;
   driver.video_data = driver.video->init(&video, &driver.input, &driver.input_data);

   if ( driver.video_data == NULL )
   {
      SSNES_ERR("Cannot open video driver... Exiting ...\n");
      exit(1);
   }

   // Video driver didn't provide an input driver so we use configured one.
   if (driver.input == NULL)
   {
      driver.input = tmp;
      if (driver.input != NULL)
      {
         driver.input_data = driver.input->init();
         if ( driver.input_data == NULL )
         {
            SSNES_ERR("Cannot init input driver. Exiting ...\n");
            exit(1);
         }
      }
      else
      {
         SSNES_ERR("Cannot find input driver. Exiting ...\n");
         exit(1);
      }
   }
}

void uninit_video_input(void)
{
   if ( driver.video_data && driver.video )
      driver.video->free(driver.video_data);

   if ( driver.input_data != driver.video_data && driver.input )
      driver.input->free(driver.input_data);
}

driver_t driver;

#if 0
driver_t driver = {
#if VIDEO_DRIVER == VIDEO_GL
   .video = &video_gl,
#else
#error "Define a valid video driver in config.h"
#endif

#if AUDIO_DRIVER == AUDIO_ALSA
   .audio = &audio_alsa,
#elif AUDIO_DRIVER == AUDIO_RSOUND
   .audio = &audio_rsound,
#elif AUDIO_DRIVER == AUDIO_OSS
   .audio = &audio_oss,
#elif AUDIO_DRIVER == AUDIO_ROAR
   .audio = &audio_roar,
#elif AUDIO_DRIVER == AUDIO_AL
   .audio = &audio_openal,
#else
#error "Define a valid audio driver in config.h"
#endif
};
#endif