starting frame offset

1 files changed, 7 insertions, 5 deletions

diff --git a/app/client/audio/wav2pix.js b/app/client/audio/wav2pix.js
index 5f48814..9bd7a15 100644
--- a/app/client/audio/wav2pix.js
+++ b/app/client/audio/wav2pix.js
@@ -53,7 +53,7 @@ export const loadPCM = (file) => {
   })
 }
 
-export const renderFrames = (file, { frame_step=FRAME_STEP, max=12 }) => dispatch => {
+export const renderFrames = (file, { frame_step=FRAME_STEP, frame_start=0, max=12 }) => dispatch => {
   return new Promise((resolve, reject) => {
     loadPCM(file).then((pcmProps) => {
       const { file, buffer, pcm, sr } = pcmProps
@@ -61,7 +61,7 @@ export const renderFrames = (file, { frame_step=FRAME_STEP, max=12 }) => dispatc
       let frames = []
       let count = 0
       let _len = pcm.length - FRAME_LENGTH
-      let offset = _len / 4
+      let offset = Math.round(_len * frame_start)
       for (;
             offset < _len && count < max;
             offset += frame_step, count += 1
@@ -74,7 +74,7 @@ export const renderFrames = (file, { frame_step=FRAME_STEP, max=12 }) => dispatc
   })
 }
 
-export const buildZip = (name, file, { frame_step=FRAME_STEP, max=10000 }) => dispatch => {
+export const buildZip = (name, file, { frame_step=FRAME_STEP, frame_start=0, max=10000 }) => dispatch => {
   return new Promise((resolve, reject) => {
     loadPCM(file).then(({ buffer, pcm, sr }) => {
       dispatch({ type: types.wav2pix.load })
@@ -85,13 +85,15 @@ export const buildZip = (name, file, { frame_step=FRAME_STEP, max=10000 }) => di
       let steps = (pcm.length - FRAME_LENGTH) / frame_step
       console.log(steps)
 
-      let offset = 0, count = 0, _len = pcm.length - FRAME_LENGTH
+      let count = 0
+      let _len = pcm.length - FRAME_LENGTH
+      let offset = Math.round(_len * frame_start)
       for (;
             offset < _len && count < max;
             offset += frame_step, count += 1
           ) {
         if ((count % 10) === 0) {
-          dispatch({ type: types.wav2pix.progress, progress: { i: count / steps * 6, n: 6 } })
+          dispatch({ type: types.wav2pix.progress, progress: { i: count / max * 6, n: 6 } })
         }
         render(pcm.slice(offset, offset+FRAME_LENGTH), sr, count, zip_folder)
       }