Tweak paramters of mp3_play_data and callback.

Use generic void * and size_t and make mp3_play_data and its callback
agree on types. Use mp3_play_callback_t instead of prototyping
right in the function call (so it's not so messy to look at). Change
doesn't appear to require plugin API version increment.

Change-Id: Idcab2740ee316a2beb6e0a87b8f4934d9d6b3dd8

3 files changed, 3 insertions, 3 deletions

diff --git a/apps/plugins/chip8.c b/apps/plugins/chip8.c
index 0e1b9c5213..b2faed5d80 100644
--- a/apps/plugins/chip8.c
+++ b/apps/plugins/chip8.c
@@ -1268,7 +1268,7 @@ static unsigned char beep[]={255,
 111,181,184,144, 17,148, 21,101,166,227,100, 86, 85, 85, 85}; 
 
 /* callback to request more mp3 data */
-static void callback(unsigned char** start, size_t* size)
+static void callback(const void** start, size_t* size)
 {
     *start = beep; /* give it the same frame again */
     *size = sizeof(beep);
diff --git a/apps/plugins/metronome.c b/apps/plugins/metronome.c
index 297405571f..54af82fa76 100644
--- a/apps/plugins/metronome.c
+++ b/apps/plugins/metronome.c
@@ -683,7 +683,7 @@ int bpm_step_counter = 0;
 #define MET_IS_PLAYING rb->mp3_is_playing()
 #define MET_PLAY_STOP rb->mp3_play_stop()
 
-static void callback(unsigned char** start, size_t* size)
+static void callback(const void** start, size_t* size)
 {
     (void)start; /* unused parameter, avoid warning */
     *size = 0; /* end of data */
diff --git a/apps/plugins/video.c b/apps/plugins/video.c
index 9053ae7fb0..6a66324a79 100644
--- a/apps/plugins/video.c
+++ b/apps/plugins/video.c
@@ -448,7 +448,7 @@ static void timer4_isr(void)
 
 
 /* ISR function to get more mp3 data */
-static void GetMoreMp3(unsigned char** start, size_t* size)
+static void GetMoreMp3(const void** start, size_t* size)
 {
     int available;
     int advance;