From 88c2337225e04cc8e9d412155e97df1ffedf1bae Mon Sep 17 00:00:00 2001
From: Ray <raysan5@gmail.com>
Date: Thu, 17 May 2018 00:04:58 +0200
Subject: [PATCH] Preliminary support for MP3 fileformat -WIP-

---
 src/audio.c | 41 ++++++++++++++++++++++++++++++++++++++---
 1 file changed, 38 insertions(+), 3 deletions(-)

diff --git a/src/audio.c b/src/audio.c
index 1d42e52b4..4e18df26f 100644
--- a/src/audio.c
+++ b/src/audio.c
@@ -73,8 +73,6 @@
 *
 **********************************************************************************************/
 
-#include "config.h"
-
 #if !defined(USE_OPENAL_BACKEND)
     #define USE_MINI_AL 1       // Set to 1 to use mini_al; 0 to use OpenAL.
 #endif
@@ -83,7 +81,8 @@
     #include "audio.h"
     #include <stdarg.h>         // Required for: va_list, va_start(), vfprintf(), va_end()
 #else
-    #include "raylib.h"
+    #include "config.h"         // Defines module configuration flags
+    #include "raylib.h"         // Declares module functions
     #include "utils.h"          // Required for: fopen() Android mapping
 #endif
 
@@ -164,6 +163,7 @@
 typedef enum { 
     MUSIC_AUDIO_OGG = 0, 
     MUSIC_AUDIO_FLAC, 
+    MUSIC_AUDIO_MP3, 
     MUSIC_MODULE_XM, 
     MUSIC_MODULE_MOD 
 } MusicContextType;
@@ -177,6 +177,9 @@ typedef struct MusicData {
 #if defined(SUPPORT_FILEFORMAT_FLAC)
     drflac *ctxFlac;                    // FLAC audio context
 #endif
+#if defined(SUPPORT_FILEFORMAT_MP3)
+    drmp3 ctxMp3;                       // MP3 audio context
+#endif
 #if defined(SUPPORT_FILEFORMAT_XM)
     jar_xm_context_t *ctxXm;            // XM chiptune context
 #endif
@@ -1368,6 +1371,27 @@ Music LoadMusicStream(const char *fileName)
         }
     }
 #endif
+#if defined(SUPPORT_FILEFORMAT_MP3)
+    else if (IsFileExtension(fileName, ".mp3"))
+    {
+        drmp3_init_file(&music->ctxMp3, fileName, NULL)
+
+        if (music->ctxMp3 == NULL) TraceLog(LOG_WARNING, "[%s] MP3 audio file could not be opened", fileName);
+        else
+        {
+            music->stream = InitAudioStream(music->ctxMp3.sampleRate, 16, music->ctxMp3.channels);
+            //music->totalSamples = (unsigned int)music->ctxMp3.totalSampleCount/music->ctxMp3.channels;    //TODO!
+            music->samplesLeft = music->totalSamples;
+            music->ctxType = MUSIC_AUDIO_MP3;
+            music->loopCount = -1;                       // Infinite loop by default
+
+            TraceLog(LOG_DEBUG, "[%s] MP3 total samples: %i", fileName, music->totalSamples);
+            TraceLog(LOG_DEBUG, "[%s] MP3 sample rate: %i", fileName, music->ctxMp3.sampleRate);
+            //TraceLog(LOG_DEBUG, "[%s] MP3 bits per sample: %i", fileName, music->ctxMp3.bitsPerSample);
+            TraceLog(LOG_DEBUG, "[%s] MP3 channels: %i", fileName, music->ctxMp3.channels);
+        }
+    }
+#endif
 #if defined(SUPPORT_FILEFORMAT_XM)
     else if (IsFileExtension(fileName, ".xm"))
     {
@@ -1423,6 +1447,9 @@ void UnloadMusicStream(Music music)
 #if defined(SUPPORT_FILEFORMAT_FLAC)
     else if (music->ctxType == MUSIC_AUDIO_FLAC) drflac_free(music->ctxFlac);
 #endif
+#if defined(SUPPORT_FILEFORMAT_MP3)
+    else if (music->ctxType == MUSIC_AUDIO_MP3) drmp3_uninit(&music->ctxMp3);
+#endif
 #if defined(SUPPORT_FILEFORMAT_XM)
     else if (music->ctxType == MUSIC_MODULE_XM) jar_xm_free_context(music->ctxXm);
 #endif
@@ -1564,6 +1591,14 @@ void UpdateMusicStream(Music music)
 
             } break;
         #endif
+        #if defined(SUPPORT_FILEFORMAT_MP3)
+            case MUSIC_AUDIO_MP3: 
+            {
+                // NOTE: Returns the number of samples to process
+                unsigned int numSamplesMp3 = (unsigned int)drmp3_read_f32(music->ctxMp3, samplesCount*music->stream.channels, (short *)pcm);
+
+            } break;
+        #endif
         #if defined(SUPPORT_FILEFORMAT_XM)
             case MUSIC_MODULE_XM: jar_xm_generate_samples_16bit(music->ctxXm, pcm, samplesCount); break;
         #endif