Move FPS display out of video_out_rockbox.c and into mpegplayer.c. Also add frame-rate limiting and frame-skipping (skipping display only, not decoding) to try and achieve real-time playback. Frame-rate limiting and frame skipping (and FPS display) are enabled via options in a new menu and are currently all off by default.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@10669 a1c6a512-1295-4272-9138-f99709370657

apps/plugins/mpegplayer/SOURCES

@@ -7,4 +7,5 @@ idct.c
 motion_comp.c
 slice.c
 video_out_rockbox.c
+mpeg_settings.c
 mpegplayer.c

apps/plugins/mpegplayer/mpeg_settings.c

@@ -0,0 +1,118 @@
+#include "plugin.h"
+#include "lib/configfile.h"
+
+#include "mpeg_settings.h"
+
+extern struct plugin_api* rb;
+
+struct mpeg_settings settings;
+static struct mpeg_settings old_settings;
+
+#define SETTINGS_VERSION 1
+#define SETTINGS_MIN_VERSION 1
+#define SETTINGS_FILENAME "mpegplayer.cfg"
+
+static char* showfps_options[] = {"No", "Yes"};
+static char* limitfps_options[] = {"No", "Yes"};
+static char* skipframes_options[] = {"No", "Yes"};
+
+static struct configdata config[] =
+{
+   {TYPE_ENUM, 0, 2, &settings.showfps, "Show FPS", showfps_options, NULL},
+   {TYPE_ENUM, 0, 2, &settings.limitfps, "Limit FPS", limitfps_options, NULL},
+   {TYPE_ENUM, 0, 2, &settings.skipframes, "Skip frames", skipframes_options, NULL},
+};
+
+bool mpeg_menu(void)
+{
+    int m;
+    int result;
+    int menu_quit=0;
+
+    static const struct opt_items noyes[2] = {
+        { "No", -1 },
+        { "Yes", -1 },
+    };
+
+    static const struct menu_item items[] = {
+        { "Display FPS", NULL },
+        { "Limit FPS", NULL },
+        { "Skip frames", NULL },
+        { "Quit mpegplayer", NULL },
+    };
+    
+    m = rb->menu_init(items, sizeof(items) / sizeof(*items),
+                      NULL, NULL, NULL, NULL);
+
+    rb->button_clear_queue();
+
+    while (!menu_quit) {
+        result=rb->menu_show(m);
+
+        switch(result)
+        {
+            case 0: /* Show FPS */
+                rb->set_option("Display FPS",&settings.showfps,INT, 
+                               noyes, 2, NULL);
+                break;
+            case 1: /* Limit FPS */
+                rb->set_option("Limit FPS",&settings.limitfps,INT, 
+                               noyes, 2, NULL);
+                break;
+            case 2: /* Skip frames */
+                rb->set_option("Skip frames",&settings.skipframes,INT, 
+                               noyes, 2, NULL);
+                break;
+            default:
+                menu_quit=1;
+                break;
+        }
+    }
+
+    rb->menu_exit(m);
+
+    rb->lcd_clear_display();
+    rb->lcd_update();
+
+    return (result==3);
+}
+
+
+void init_settings(void)
+{
+    /* Set the default settings */
+    settings.showfps = 0;     /* Do not show FPS */
+    settings.limitfps = 0;    /* Do not limit FPS */
+    settings.skipframes = 0;  /* Do not skip frames */
+
+    configfile_init(rb);
+
+    if (configfile_load(SETTINGS_FILENAME, config,
+                        sizeof(config)/sizeof(*config),
+                        SETTINGS_MIN_VERSION
+                       ) < 0)
+    {
+        /* If the loading failed, save a new config file (as the disk is
+           already spinning) */
+        configfile_save(SETTINGS_FILENAME, config,
+                        sizeof(config)/sizeof(*config),
+                        SETTINGS_VERSION);
+    }
+
+    /* Keep a copy of the saved version of the settings - so we can check if 
+       the settings have changed when we quit */
+    old_settings = settings;
+}
+
+void save_settings(void)
+{
+    /* Save the user settings if they have changed */
+    if (rb->memcmp(&settings,&old_settings,sizeof(settings))!=0) {
+        configfile_save(SETTINGS_FILENAME, config,
+                        sizeof(config)/sizeof(*config),
+                        SETTINGS_VERSION);
+
+        /* Store the settings in old_settings - to check for future changes */
+        old_settings = settings;
+    }
+}

apps/plugins/mpegplayer/mpeg_settings.h

@@ -0,0 +1,14 @@
+
+#include "plugin.h"
+
+struct mpeg_settings {
+    int showfps;
+    int limitfps;
+    int skipframes;
+};
+
+extern struct mpeg_settings settings;
+
+bool mpeg_menu(void);
+void init_settings(void);
+void save_settings(void);

apps/plugins/mpegplayer/mpegplayer.c

@@ -27,6 +27,7 @@
 #include "plugin.h"
 
 #include "mpeg2.h"
+#include "mpeg_settings.h"
 #include "video_out.h"
 
 PLUGIN_HEADER
@@ -41,44 +42,88 @@ extern char iend[];
 
 struct plugin_api* rb;
 
-/* The main buffer storing the compressed video data */
-#define BUFFER_SIZE (MEM-6)*1024*1024
-
 static mpeg2dec_t * mpeg2dec;
 static int total_offset = 0;
 
 /* button definitions */
 #if (CONFIG_KEYPAD == IRIVER_H100_PAD) || (CONFIG_KEYPAD == IRIVER_H300_PAD)
+#define MPEG_MENU       BUTTON_MODE
 #define MPEG_STOP       BUTTON_OFF
 #define MPEG_PAUSE      BUTTON_ON
 
 #elif (CONFIG_KEYPAD == IPOD_3G_PAD) || (CONFIG_KEYPAD == IPOD_4G_PAD)
-#define MPEG_STOP       BUTTON_MENU
+#define MPEG_MENU       BUTTON_MENU
-#define MPEG_PAUSE      BUTTON_PLAY
+#define MPEG_PAUSE      (BUTTON_PLAY | BUTTON_REL)
+#define MPEG_STOP       (BUTTON_PLAY | BUTTON_REPEAT)
 
 #elif CONFIG_KEYPAD == IAUDIO_X5_PAD
+#define MPEG_MENU       (BUTTON_REC | BUTTON_REL)
 #define MPEG_STOP       BUTTON_POWER
 #define MPEG_PAUSE      BUTTON_PLAY
 
 #elif CONFIG_KEYPAD == GIGABEAT_PAD
+#define MPEG_MENU       BUTTON_MENU
 #define MPEG_STOP       BUTTON_A
 #define MPEG_PAUSE      BUTTON_SELECT
 
 #elif CONFIG_KEYPAD == IRIVER_H10_PAD
+#define MPEG_MENU       (BUTTON_REW | BUTTON_REL)
 #define MPEG_STOP       BUTTON_POWER
 #define MPEG_PAUSE      BUTTON_PLAY
 
 #else
 #error MPEGPLAYER: Unsupported keypad
 #endif
+
+static int tick_enabled = 0;
+
+#define MPEG_CURRENT_TICK ((unsigned int)((*rb->current_tick - tick_offset)))
+
+/* The value to subtract from current_tick to get the current mpeg tick */
+static int tick_offset;
+
+/* The last tick - i.e. the time to reset the tick_offset to when unpausing */
+static int last_tick;
+
+void start_timer(void)
+{
+    last_tick = 0;
+    tick_offset = *rb->current_tick;
+}
+
+void unpause_timer(void)
+{
+    tick_offset = *rb->current_tick - last_tick;
+}
+
+void pause_timer(void)
+{
+    /* Save the current MPEG tick */
+    last_tick = *rb->current_tick - tick_offset;
+}
+
+
 static bool button_loop(void)
 {
+    bool result;
     int button = rb->button_get(false);
+
     switch (button)
     {
+        case MPEG_MENU:
+            pause_timer(); 
+
+            result = mpeg_menu();
+
+            unpause_timer();
+
+            return result;
+
         case MPEG_STOP:
             return true;
+
         case MPEG_PAUSE:
+            pause_timer(); /* Freeze time */
             button = BUTTON_NONE;
 #ifdef HAVE_ADJUSTABLE_CPU_FREQ
             rb->cpu_boost(false);
@@ -91,7 +136,9 @@ static bool button_loop(void)
 #ifdef HAVE_ADJUSTABLE_CPU_FREQ
             rb->cpu_boost(true);
 #endif
+            unpause_timer(); /* Resume time */
             break;
+
         default:
             if(rb->default_event_handler(button) == SYS_USB_CONNECTED)
                 return true;
@@ -99,10 +146,59 @@ static bool button_loop(void)
     return false;
 }
 
+/*
+
+NOTES:
+
+MPEG System Clock is 27MHz - i.e. 27000000 ticks/second.
+
+FPS is represented in terms of a frame period - this is always an
+integer number of 27MHz ticks.
+
+e.g. 29.97fps (30000/1001) NTSC video has an exact frame period of
+900900 27MHz ticks.
+
+In libmpeg2, info->sequence->frame_period contains the frame_period.
+
+Working with Rockbox's 100Hz tick, the common frame rates would need
+to be as follows:
+
+FPS     | 27Mhz   | 100Hz
+--------|----------------
+10*     | 2700000 | 10
+12*     | 2250000 |  8.3333
+15*     | 1800000 |  6.6667
+23.9760 | 1126125 |  4.170833333
+24      | 1125000 |  4.166667
+25      | 1080000 |  4
+29.9700 |  900900 |  3.336667
+30      |  900000 |  3.333333
+
+
+*Unofficial framerates
+
+*/
+
+static uint64_t eta;
+
 static bool decode_mpeg2 (uint8_t * current, uint8_t * end)
 {
     const mpeg2_info_t * info;
     mpeg2_state_t state;
+    char str[80];
+    static int skipped = 0;
+    static int frame = 0;
+    static int starttick = 0;
+    static int lasttick;
+    unsigned int eta2;
+    unsigned int x;
+
+    int fps;
+
+    if (starttick == 0) {
+        starttick=*rb->current_tick-1; /* Avoid divby0 */
+        lasttick=starttick;
+    }
 
     mpeg2_buffer (mpeg2dec, current, end);
     total_offset += end - current;
@@ -122,6 +218,7 @@ static bool decode_mpeg2 (uint8_t * current, uint8_t * end)
                      info->sequence->chroma_width,
                      info->sequence->chroma_height);
             mpeg2_skip (mpeg2dec, false);
+
             break;
         case STATE_PICTURE:
             break;
@@ -129,8 +226,44 @@ static bool decode_mpeg2 (uint8_t * current, uint8_t * end)
         case STATE_END:
         case STATE_INVALID_END:
             /* draw current picture */
-            if (info->display_fbuf)
+            if (info->display_fbuf) {
-                vo_draw_frame(info->display_fbuf->buf);
+                /* We start the timer when we draw the first frame */
+                if (!tick_enabled) {
+                    start_timer();
+                    tick_enabled = 1 ;
+                }
+
+                eta += (info->sequence->frame_period);
+                eta2 = eta / (27000000 / HZ);
+
+                if (settings.limitfps) {
+                    if (eta2 > MPEG_CURRENT_TICK) {
+                        rb->sleep(eta2-MPEG_CURRENT_TICK);
+                    }              
+                }
+                x = MPEG_CURRENT_TICK;
+
+                /* If we are more than 1/20 second behind schedule (and 
+                   more than 1/20 second into the decoding), skip frame */
+                if (settings.skipframes && (x > HZ/20) && 
+                   (eta2 < (x - (HZ/20)))) {
+                    skipped++;
+                } else {
+                    vo_draw_frame(info->display_fbuf->buf);
+                }
+
+                /* Calculate fps */
+                frame++;
+                if (settings.showfps && (*rb->current_tick-lasttick>=HZ)) {
+                    fps=(frame*(HZ*10))/x;
+                    rb->snprintf(str,sizeof(str),"%d.%d %d %d %d",
+                                 (fps/10),fps%10,skipped,x,eta2);
+                    rb->lcd_putsxy(0,0,str);
+                    rb->lcd_update_rect(0,0,LCD_WIDTH,8);
+        
+                    lasttick = *rb->current_tick;
+                }
+            }
             break;
         default:
             break;
@@ -147,8 +280,10 @@ static void es_loop (int in_file, uint8_t* buffer, size_t buffer_size)
     if (buffer==NULL)
         return;
 
+    eta = 0;
     do {
         rb->splash(0,true,"Buffering...");
+        save_settings();  /* Save settings (if they have changed) */
         end = buffer + rb->read (in_file, buffer, buffer_size);
         if (decode_mpeg2 (buffer, end))
             break;
@@ -202,6 +337,8 @@ enum plugin_status plugin_start(struct plugin_api* api, void* parameter)
         return PLUGIN_ERROR;
     }
 
+    init_settings();
+
     mpeg2dec = mpeg2_init ();
 
     if (mpeg2dec == NULL)
@@ -230,6 +367,8 @@ enum plugin_status plugin_start(struct plugin_api* api, void* parameter)
     rb->cpu_boost(false);
 #endif
 
+    save_settings();  /* Save settings (if they have changed) */
+
 #ifdef CONFIG_BACKLIGHT
     /* reset backlight settings */
     rb->backlight_set_timeout(rb->global_settings->backlight_timeout);

apps/plugins/mpegplayer/video_out_rockbox.c

@@ -30,9 +30,6 @@ extern struct plugin_api* rb;
 #include "mpeg2.h"
 #include "video_out.h"
 
-static int starttick = 0;
-static int lasttick = 0;
-
 #define CSUB_X 2
 #define CSUB_Y 2
 
@@ -191,10 +188,6 @@ static void yuv_bitmap_part(unsigned char * const src[3],
 
 void vo_draw_frame (uint8_t * const * buf)
 {
-    char str[80];
-    static int frame=0;
-    int ticks,fps;
-
 #ifdef SIMULATOR
     yuv_bitmap_part(buf,0,0,image_width,
                     output_x,output_y,output_width,output_height);
@@ -204,24 +197,6 @@ void vo_draw_frame (uint8_t * const * buf)
                     0,0,image_width,
                     output_x,output_y,output_width,output_height);
 #endif
-
-    if (starttick==0) {
-        starttick=*rb->current_tick-1; /* Avoid divby0 */
-        lasttick=starttick;
-    }
-
-    /* Calculate fps */
-    if (*rb->current_tick-lasttick>=2*HZ) {
-        ticks=(*rb->current_tick)-starttick;
-
-        fps=(frame*1000)/ticks;
-        rb->snprintf(str,sizeof(str),"%d.%d",(fps/10),fps%10);
-        rb->lcd_putsxy(0,0,str);
-        rb->lcd_update_rect(0,0,80,8);
-        
-        lasttick+=2*HZ;
-    }
-    frame++;
 }
 
 void vo_setup(unsigned int width, unsigned int height,