Make some sound functions const.

Public issue https://github.com/mackron/miniaudio/issues/990

miniaudio.h

@@ -11449,11 +11449,11 @@ MA_API ma_bool32 ma_sound_is_looping(const ma_sound* pSound);
 MA_API ma_bool32 ma_sound_at_end(const ma_sound* pSound);
 MA_API ma_result ma_sound_seek_to_pcm_frame(ma_sound* pSound, ma_uint64 frameIndex); /* Just a wrapper around ma_data_source_seek_to_pcm_frame(). */
 MA_API ma_result ma_sound_seek_to_second(ma_sound* pSound, float seekPointInSeconds); /* Abstraction to ma_sound_seek_to_pcm_frame() */
-MA_API ma_result ma_sound_get_data_format(ma_sound* pSound, ma_format* pFormat, ma_uint32* pChannels, ma_uint32* pSampleRate, ma_channel* pChannelMap, size_t channelMapCap);
-MA_API ma_result ma_sound_get_cursor_in_pcm_frames(ma_sound* pSound, ma_uint64* pCursor);
-MA_API ma_result ma_sound_get_length_in_pcm_frames(ma_sound* pSound, ma_uint64* pLength);
-MA_API ma_result ma_sound_get_cursor_in_seconds(ma_sound* pSound, float* pCursor);
-MA_API ma_result ma_sound_get_length_in_seconds(ma_sound* pSound, float* pLength);
+MA_API ma_result ma_sound_get_data_format(const ma_sound* pSound, ma_format* pFormat, ma_uint32* pChannels, ma_uint32* pSampleRate, ma_channel* pChannelMap, size_t channelMapCap);
+MA_API ma_result ma_sound_get_cursor_in_pcm_frames(const ma_sound* pSound, ma_uint64* pCursor);
+MA_API ma_result ma_sound_get_length_in_pcm_frames(const ma_sound* pSound, ma_uint64* pLength);
+MA_API ma_result ma_sound_get_cursor_in_seconds(const ma_sound* pSound, float* pCursor);
+MA_API ma_result ma_sound_get_length_in_seconds(const ma_sound* pSound, float* pLength);
 MA_API ma_result ma_sound_set_end_callback(ma_sound* pSound, ma_sound_end_proc callback, void* pUserData);
 
 MA_API ma_result ma_sound_group_init(ma_engine* pEngine, ma_uint32 flags, ma_sound_group* pParentGroup, ma_sound_group* pGroup);
@@ -79291,7 +79291,7 @@ MA_API ma_result ma_sound_seek_to_second(ma_sound* pSound, float seekPointInSeco
     return ma_sound_seek_to_pcm_frame(pSound, frameIndex);
 }
 
-MA_API ma_result ma_sound_get_data_format(ma_sound* pSound, ma_format* pFormat, ma_uint32* pChannels, ma_uint32* pSampleRate, ma_channel* pChannelMap, size_t channelMapCap)
+MA_API ma_result ma_sound_get_data_format(const ma_sound* pSound, ma_format* pFormat, ma_uint32* pChannels, ma_uint32* pSampleRate, ma_channel* pChannelMap, size_t channelMapCap)
 {
     if (pSound == NULL) {
         return MA_INVALID_ARGS;
@@ -79324,7 +79324,7 @@ MA_API ma_result ma_sound_get_data_format(ma_sound* pSound, ma_format* pFormat,
     }
 }
 
-MA_API ma_result ma_sound_get_cursor_in_pcm_frames(ma_sound* pSound, ma_uint64* pCursor)
+MA_API ma_result ma_sound_get_cursor_in_pcm_frames(const ma_sound* pSound, ma_uint64* pCursor)
 {
     ma_uint64 seekTarget;
 
@@ -79346,7 +79346,7 @@ MA_API ma_result ma_sound_get_cursor_in_pcm_frames(ma_sound* pSound, ma_uint64*
     }
 }
 
-MA_API ma_result ma_sound_get_length_in_pcm_frames(ma_sound* pSound, ma_uint64* pLength)
+MA_API ma_result ma_sound_get_length_in_pcm_frames(const ma_sound* pSound, ma_uint64* pLength)
 {
     if (pSound == NULL) {
         return MA_INVALID_ARGS;
@@ -79360,7 +79360,7 @@ MA_API ma_result ma_sound_get_length_in_pcm_frames(ma_sound* pSound, ma_uint64*
     return ma_data_source_get_length_in_pcm_frames(pSound->pDataSource, pLength);
 }
 
-MA_API ma_result ma_sound_get_cursor_in_seconds(ma_sound* pSound, float* pCursor)
+MA_API ma_result ma_sound_get_cursor_in_seconds(const ma_sound* pSound, float* pCursor)
 {
     ma_result result;
     ma_uint64 cursorInPCMFrames;
@@ -79386,7 +79386,7 @@ MA_API ma_result ma_sound_get_cursor_in_seconds(ma_sound* pSound, float* pCursor
     return MA_SUCCESS;
 }
 
-MA_API ma_result ma_sound_get_length_in_seconds(ma_sound* pSound, float* pLength)
+MA_API ma_result ma_sound_get_length_in_seconds(const ma_sound* pSound, float* pLength)
 {
     if (pSound == NULL) {
         return MA_INVALID_ARGS;