Add ma_seek_origin_end in preparation for future work.

miniaudio.h

@@ -5404,7 +5404,8 @@ MA_API ma_result ma_audio_buffer_at_end(ma_audio_buffer* pAudioBuffer);
 typedef enum
 {
     ma_seek_origin_start,
-    ma_seek_origin_current
+    ma_seek_origin_current,
+    ma_seek_origin_end  /* Not used by decoders. */
 } ma_seek_origin;
 
 typedef enum
@@ -5426,7 +5427,7 @@ you do your own synchronization.
 typedef struct ma_decoder ma_decoder;
 
 typedef size_t    (* ma_decoder_read_proc)                    (ma_decoder* pDecoder, void* pBufferOut, size_t bytesToRead);     /* Returns the number of bytes read. */
-typedef ma_bool32 (* ma_decoder_seek_proc)                    (ma_decoder* pDecoder, int byteOffset, ma_seek_origin origin);
+typedef ma_bool32 (* ma_decoder_seek_proc)                    (ma_decoder* pDecoder, int byteOffset, ma_seek_origin origin);    /* Origin will never be ma_seek_origin_end. */
 typedef ma_uint64 (* ma_decoder_read_pcm_frames_proc)         (ma_decoder* pDecoder, void* pFramesOut, ma_uint64 frameCount);   /* Returns the number of frames read. Output data is in internal format. */
 typedef ma_result (* ma_decoder_seek_to_pcm_frame_proc)       (ma_decoder* pDecoder, ma_uint64 frameIndex);
 typedef ma_result (* ma_decoder_uninit_proc)                  (ma_decoder* pDecoder);
@@ -5549,8 +5550,8 @@ MA_API ma_result ma_decoder_seek_to_pcm_frame(ma_decoder* pDecoder, ma_uint64 fr
 Helper for opening and decoding a file into a heap allocated block of memory. Free the returned pointer with ma_free(). On input,
 pConfig should be set to what you want. On output it will be set to what you got.
 */
-MA_API ma_result ma_decode_file(const char* pFilePath, ma_decoder_config* pConfig, ma_uint64* pFrameCountOut, void** ppDataOut);
-MA_API ma_result ma_decode_memory(const void* pData, size_t dataSize, ma_decoder_config* pConfig, ma_uint64* pFrameCountOut, void** ppDataOut);
+MA_API ma_result ma_decode_file(const char* pFilePath, ma_decoder_config* pConfig, ma_uint64* pFrameCountOut, void** ppPCMFramesOut);
+MA_API ma_result ma_decode_memory(const void* pData, size_t dataSize, ma_decoder_config* pConfig, ma_uint64* pFrameCountOut, void** ppPCMFramesOut);
 
 #endif  /* MA_NO_DECODING */