From d1ace48ff92a4c627f37c63b07e534be9adea751 Mon Sep 17 00:00:00 2001
From: itsmattkc <itsmattkc@gmail.com>
Date: Wed, 18 Dec 2019 22:38:34 +1100
Subject: [PATCH] started audio speed stretching

---
 app/render/backend/audiorenderworker.cpp | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/app/render/backend/audiorenderworker.cpp b/app/render/backend/audiorenderworker.cpp
index f1fa9a3b4..0e9b9b715 100644
--- a/app/render/backend/audiorenderworker.cpp
+++ b/app/render/backend/audiorenderworker.cpp
@@ -51,6 +51,29 @@ NodeValueTable AudioRenderWorker::RenderBlock(const TrackOutput *track, const Ti
     int copied_size = 0;
 
     if (!samples_from_this_block.isEmpty()) {
+      // Stretch samples here
+      if (b->media_length() != b->length()) {
+        QByteArray speed_adjusted_samples;
+        double clip_speed = b->speed();
+        int sample_count = audio_params_.bytes_to_samples(samples_from_this_block.size());
+
+        qDebug() << "Adjusting audio to speed" << clip_speed;
+
+        for (double i=0;i<sample_count;i+=clip_speed) {
+          int sample_index = qFloor(i);
+          int byte_index = audio_params_.samples_to_bytes(sample_index);
+
+          if (byte_index >= samples_from_this_block.size() || (byte_index + audio_params_.samples_to_bytes(1)) > samples_from_this_block.size()) {
+            qDebug() << "Tried to access" << byte_index << "-" << (byte_index + audio_params_.samples_to_bytes(1)) << "of" << samples_from_this_block.size();
+          }
+
+          QByteArray sample_at_this_index = samples_from_this_block.mid(byte_index, audio_params_.samples_to_bytes(1));
+          speed_adjusted_samples.append(sample_at_this_index);
+        }
+
+        samples_from_this_block = speed_adjusted_samples;
+      }
+
       copied_size = samples_from_this_block.size();
 
       memcpy(block_range_buffer.data()+destination_offset,