From 6616113ea4e0bfb4022fe726d0a33ba769f37757 Mon Sep 17 00:00:00 2001
From: Jonathan Oakley <h4yn0nnym0u5e@users.noreply.github.com>
Date: Tue, 20 Jun 2023 21:38:06 +0100
Subject: [PATCH] Permit playback of WAV file stored in RAM (#58)

Duplicates some of the WaveHeaderParser stuff to extract the correct start point and channel count from the buffered WAV data, then calls playRaw()
---
 src/ResamplingReader.h | 29 +++++++++++++++++++++++++++++
 src/playresmp.h        |  6 ++++++
 2 files changed, 35 insertions(+)

diff --git a/src/ResamplingReader.h b/src/ResamplingReader.h
index ad74274..a7455c7 100644
--- a/src/ResamplingReader.h
+++ b/src/ResamplingReader.h
@@ -61,6 +61,35 @@ class ResamplingReader {
         return playRaw(array, true); 
     }
 
+    bool playWav(TArray *array) {
+        bool result = false;
+        
+        do
+        {
+            wav_header hdr;
+            unsigned infoTagsSize;
+            wav_data_header wav_data_hdr;           
+            WaveHeaderParser parser;
+            
+            if (!parser.readWaveHeaderFromBuffer((char*) array, hdr))
+                break;
+            
+            // make unwarranted assumptions about the header format
+            // by using a magic number...
+            if (!parser.readInfoTags((unsigned char*) array, 36, infoTagsSize))
+                break;
+            
+            if (!parser.readDataHeader((unsigned char*) array, 36 + infoTagsSize, wav_data_hdr))
+                break;
+                        
+            result = playRaw((TArray*)((char*) array + (36 + infoTagsSize + sizeof wav_data_hdr)), 
+                             wav_data_hdr.data_bytes / 2, 
+                             hdr.num_channels); 
+        } while (0);
+        
+        return result;
+    }
+
     bool play(const char *filename, bool isWave, uint16_t numChannelsIfRaw = 0)
     {
         close();
diff --git a/src/playresmp.h b/src/playresmp.h
index 74784f6..4ca6052 100644
--- a/src/playresmp.h
+++ b/src/playresmp.h
@@ -54,6 +54,12 @@ class AudioPlayResmp : public AudioStream
             return playWav((int16_t *) data, fileSize);
         }
 
+        bool playWav(int16_t *data)
+        {
+            stop();
+            return reader->playWav(data);
+        }
+
         void setPlaybackRate(float f) {
             reader->setPlaybackRate(f);
         }