Fixed bug 3703 - Missing media keys support on Amazon Fire TV remote control

Holger Schemel

Summary: This patch adds support for key events for the "rewind" and "fast forward" media keys on the Amazon Fire TV remote control.

How to reproduce the problem: Run Android build of SDL2 application on the Amazon Fire TV (tested with "stick" version) and log key events.

Expected behaviour: Every key pressed on the Fire TV remote control should result in a corresponding key event (pressed/released).

Observed behaviour: Of the bottom row of buttons on the Fire TV remote control, only the "play/pause" (middle) button generates a key event, while the "rewind" (left) and "fast forward" (right) buttons to not generate any event at all.

The attached patch adds support for these two missing buttons/keys.

Note 1: Some missing definitions were added for the already existing key codes SDL_SCANCODE_APP1 and SDL_SCANCODE_APP2 (to keep up the correct order of enumerations / array positions when adding the two new key codes).

Note 2: Definitions in "scancodes_linux.h" and "scancodes_xfree86.h" (to also add support for these keys on other platforms) were added without testing. However, I was unable to find corresponding definitions for these two media keys for Windows and Mac OS X.

Note 3: I have also updated the (broken) link to the USB usage page standard PDF document (comment in "include/SDL_scancode.h").

include/SDL_keycode.h

@@ -308,7 +308,12 @@ enum
     SDLK_KBDILLUMDOWN = SDL_SCANCODE_TO_KEYCODE(SDL_SCANCODE_KBDILLUMDOWN),
     SDLK_KBDILLUMUP = SDL_SCANCODE_TO_KEYCODE(SDL_SCANCODE_KBDILLUMUP),
     SDLK_EJECT = SDL_SCANCODE_TO_KEYCODE(SDL_SCANCODE_EJECT),
-    SDLK_SLEEP = SDL_SCANCODE_TO_KEYCODE(SDL_SCANCODE_SLEEP)
+    SDLK_SLEEP = SDL_SCANCODE_TO_KEYCODE(SDL_SCANCODE_SLEEP),
+    SDLK_APP1 = SDL_SCANCODE_TO_KEYCODE(SDL_SCANCODE_APP1),
+    SDLK_APP2 = SDL_SCANCODE_TO_KEYCODE(SDL_SCANCODE_APP2),
+
+    SDLK_AUDIOREWIND = SDL_SCANCODE_TO_KEYCODE(SDL_SCANCODE_AUDIOREWIND),
+    SDLK_AUDIOFASTFORWARD = SDL_SCANCODE_TO_KEYCODE(SDL_SCANCODE_AUDIOFASTFORWARD)
 };
 
 /**

include/SDL_scancode.h

@@ -38,7 +38,7 @@
  *  SDL_Event structure.
  *
  *  The values in this enumeration are based on the USB usage page standard:
- *  http://www.usb.org/developers/devclass_docs/Hut1_12v2.pdf
+ *  http://www.usb.org/developers/hidpage/Hut1_12v2.pdf
  */
 typedef enum
 {
@@ -390,6 +390,18 @@ typedef enum
 
     /* @} *//* Walther keys */
 
+    /**
+     *  \name Usage page 0x0C (additional media keys)
+     *
+     *  These values are mapped from usage page 0x0C (USB consumer page).
+     */
+    /* @{ */
+
+    SDL_SCANCODE_AUDIOREWIND = 285,
+    SDL_SCANCODE_AUDIOFASTFORWARD = 286,
+
+    /* @} *//* Usage page 0x0C (additional media keys) */
+
     /* Add any other keys here. */
 
     SDL_NUM_SCANCODES = 512 /**< not a key, just marks the number of scancodes

src/events/SDL_keyboard.c

@@ -273,6 +273,10 @@ static const SDL_Keycode SDL_default_keymap[SDL_NUM_SCANCODES] = {
     SDLK_KBDILLUMUP,
     SDLK_EJECT,
     SDLK_SLEEP,
+    SDLK_APP1,
+    SDLK_APP2,
+    SDLK_AUDIOREWIND,
+    SDLK_AUDIOFASTFORWARD,
 };
 
 static const char *SDL_scancode_names[SDL_NUM_SCANCODES] = {
@@ -505,6 +509,10 @@ static const char *SDL_scancode_names[SDL_NUM_SCANCODES] = {
     "KBDIllumUp",
     "Eject",
     "Sleep",
+    "App1",
+    "App2",
+    "AudioRewind",
+    "AudioFastForward",
 };
 
 /* Taken from SDL_iconv() */

src/events/scancodes_linux.h

@@ -194,7 +194,7 @@ static SDL_Scancode const linux_scancode_table[] = {
     /*  165 */    SDL_SCANCODE_AUDIOPREV, /* KEY_PREVIOUSSONG */
     /*  166 */    SDL_SCANCODE_AUDIOSTOP, /* KEY_STOPCD */
     /*  167 */    SDL_SCANCODE_UNKNOWN, /* KEY_RECORD */
-    /*  168 */    SDL_SCANCODE_UNKNOWN, /* KEY_REWIND */
+    /*  168 */    SDL_SCANCODE_AUDIOREWIND, /* KEY_REWIND */
     /*  169 */    SDL_SCANCODE_UNKNOWN, /* KEY_PHONE */
     /*  170 */    SDL_SCANCODE_UNKNOWN, /* KEY_ISO */
     /*  171 */    SDL_SCANCODE_UNKNOWN, /* KEY_CONFIG */
@@ -230,7 +230,7 @@ static SDL_Scancode const linux_scancode_table[] = {
     /*  205 */    SDL_SCANCODE_UNKNOWN, /* KEY_SUSPEND */
     /*  206 */    SDL_SCANCODE_UNKNOWN, /* KEY_CLOSE */
     /*  207 */    SDL_SCANCODE_UNKNOWN, /* KEY_PLAY */
-    /*  208 */    SDL_SCANCODE_UNKNOWN, /* KEY_FASTFORWARD */
+    /*  208 */    SDL_SCANCODE_AUDIOFASTFORWARD, /* KEY_FASTFORWARD */
     /*  209 */    SDL_SCANCODE_UNKNOWN, /* KEY_BASSBOOST */
     /*  210 */    SDL_SCANCODE_UNKNOWN, /* KEY_PRINT */
     /*  211 */    SDL_SCANCODE_UNKNOWN, /* KEY_HP */

src/events/scancodes_xfree86.h

@@ -345,7 +345,7 @@ static const SDL_Scancode xfree86_scancode_table2[] = {
     /* 165 */   SDL_SCANCODE_AUDIOPREV,
     /* 166 */   SDL_SCANCODE_AUDIOSTOP,
     /* 167 */   SDL_SCANCODE_UNKNOWN,   /* XF86AudioRecord */
-    /* 168 */   SDL_SCANCODE_UNKNOWN,   /* XF86AudioRewind */
+    /* 168 */   SDL_SCANCODE_AUDIOREWIND,   /* XF86AudioRewind */
     /* 169 */   SDL_SCANCODE_UNKNOWN,   /* XF86Phone */
     /* 170 */   SDL_SCANCODE_UNKNOWN,
     /* 171 */   SDL_SCANCODE_F13,       /* XF86Tools */

src/video/android/SDL_androidkeyboard.c

@@ -129,8 +129,8 @@ static SDL_Scancode Android_Keycodes[] = {
     SDL_SCANCODE_AUDIOSTOP, /* AKEYCODE_MEDIA_STOP */
     SDL_SCANCODE_AUDIONEXT, /* AKEYCODE_MEDIA_NEXT */
     SDL_SCANCODE_AUDIOPREV, /* AKEYCODE_MEDIA_PREVIOUS */
-    SDL_SCANCODE_UNKNOWN, /* AKEYCODE_MEDIA_REWIND */
-    SDL_SCANCODE_UNKNOWN, /* AKEYCODE_MEDIA_FAST_FORWARD */
+    SDL_SCANCODE_AUDIOREWIND, /* AKEYCODE_MEDIA_REWIND */
+    SDL_SCANCODE_AUDIOFASTFORWARD, /* AKEYCODE_MEDIA_FAST_FORWARD */
     SDL_SCANCODE_MUTE, /* AKEYCODE_MUTE */
     SDL_SCANCODE_PAGEUP, /* AKEYCODE_PAGE_UP */
     SDL_SCANCODE_PAGEDOWN, /* AKEYCODE_PAGE_DOWN */