still no good, but a bit cleaned up

decoder.cpp

@@ -8,7 +8,9 @@ channels(0),
 cachedLength(0),
 samplesPerFrame(0),
 glue(new uint8_t[GLUE_LENGTH]),
-lastSync(-1),
+cachedNext(NULL),
+cachedThis(NULL),
+cachedError(MAD_ERROR_NONE),
 cached(false),
 synth(),
 stream(),
@@ -107,7 +109,6 @@ emscripten::val Decoder::decode(uint32_t count)
             int res = mad_frame_decode(&frame, &stream);
             
             if (res == 0) {
-                lastSync = stream.bufend - stream.this_frame;
                 ++success;
             } else {
                 if (MAD_RECOVERABLE(stream.error)) {
@@ -153,7 +154,6 @@ bool Decoder::hasMore() const
 uint32_t Decoder::framesLeft(uint32_t max)
 {
     if (state == empty || state == onGlueHalf) {
-        cached = true;
         return 0;
     }
     
@@ -178,13 +178,16 @@ uint32_t Decoder::framesLeft(uint32_t max)
                     ++cachedLength;
                 }
             } else {
-                std::cout << "framesLeft::" << mad_stream_errorstr(&probe) << std::endl;
+                std::cout << "framesLeft error: " << mad_stream_errorstr(&probe) << std::endl;
                 if (!MAD_RECOVERABLE(probe.error)) {
                     break;
                 }
             }
         }
         
+        cachedNext = probe.next_frame;
+        cachedThis = probe.this_frame;
+        cachedError = probe.error;
         mad_header_finish(&ph);
         mad_stream_finish(&probe);
         std::cout << cachedLength << " frames are available for decoding" << std::endl;
@@ -196,13 +199,12 @@ uint32_t Decoder::framesLeft(uint32_t max)
 
 void Decoder::pullBuffer()
 {
-    mad_header dummy;
+    if (cached == false) {
-    mad_header_init(&dummy);
+        std::cout << "Error in pullBuffer method!" << std::endl;
-    while(stream.error == 0 || MAD_RECOVERABLE(stream.error)) {
-        mad_header_decode(&dummy, &stream);
-        std::cout << "pullBuffer:: " << mad_stream_errorstr(&stream) << std::endl;
     }
-    mad_header_finish(&dummy);
+    stream.this_frame = cachedThis;
+    stream.next_frame = cachedNext;
+    stream.error = cachedError;
 }
 
 void Decoder::changeBuffer()
@@ -224,39 +226,8 @@ void Decoder::changeBuffer()
             break;
         case onGlueFull:
             std::cout << "Having another fragment " << pending[0].length << " bytes long" << std::endl;
-            left = (uint64_t)stream.bufend - (uint64_t)stream.next_frame;
-//             std::cout << "MD_LENGTH_BEFORE: " << stream.anc_bitlen << std::endl;
-            mad_stream_buffer(&stream, pending[0].ptr, pending[0].length);
             
-            
+            switchBuffer(pending[0].ptr, pending[0].length);
-            //mad_stream_skip(&stream, left);
-            stream.error = MAD_ERROR_NONE;
-            if (lastSync != -1) {
-                if (lastSync > GLUE_LENGTH / 2) {
-                    std::cout << "Error: bytes to read in the buffer are more then glue buffer can fit LASTSYNC (" << lastSync << ")" << std::endl;
-                    throw 1;
-                }
-                uint64_t target = (uint64_t)stream.buffer + GLUE_LENGTH / 2 - lastSync;
-                while ((uint64_t)(stream.this_frame) < target) {
-//                     std::cout << "pulling" << std::endl;
-                    mad_frame_decode(&frame, &stream);
-                }
-                stream.error = MAD_ERROR_NONE;
-                
-//                 stream.this_frame = stream.buffer + GLUE_LENGTH / 2 - lastSync;
-//                 stream.next_frame = stream.buffer + GLUE_LENGTH / 2 - left;
-//                 stream.sync = 1;
-                
-                lastSync = -1;
-                
-//                 mad_bitptr next_frame;
-//                 mad_bit_init(&next_frame, stream.next_frame);
-//                 stream.anc_ptr    = stream.ptr;
-//                 stream.anc_bitlen = mad_bit_length(&stream.ptr, &next_frame);
-//                 mad_bit_finish(&next_frame);
-//                 
-//                 std::cout << ", MD_LENGTH_AFTER: " << stream.anc_bitlen << std::endl;
-            }
             
             for (int i = 0; i < GLUE_LENGTH/2; ++i) {
                 glue[i] = pending[0].ptr[pending[0].length - GLUE_LENGTH/2 + i];
@@ -317,46 +288,32 @@ void Decoder::initializeProbe(mad_stream& probe)
 void Decoder::switchToGlue()
 {
     std::cout << "Switching to glue" << std::endl;
-    uint32_t left = (uint64_t)stream.bufend - (uint64_t)stream.next_frame;
-    if (left > GLUE_LENGTH / 2) {
-        std::cout << "Error: bytes to read in the buffer are more then glue buffer can fit (" << left << ")" << std::endl;
-        throw 1;
-    }
-//     std::cout << "MD_LENGTH_BEFORE: " << stream.anc_bitlen << std::endl;
-    mad_stream_buffer(&stream, glue, GLUE_LENGTH);
     
-
+    switchBuffer(glue, GLUE_LENGTH);
-    if (lastSync != -1) {
-        if (lastSync > GLUE_LENGTH / 2) {
-            std::cout << "Error: bytes to read in the buffer are more then glue buffer can fit LASTSYNC (" << lastSync << ")" << std::endl;
-            throw 1;
-        }
-        uint64_t target = (uint64_t)stream.bufend - GLUE_LENGTH / 2 - lastSync;
-        while ((uint64_t)(stream.this_frame) < target) {
-//             std::cout << "pulling" << std::endl;
-            mad_frame_decode(&frame, &stream);
-        }
-        stream.error = MAD_ERROR_NONE;
-//         stream.this_frame = stream.bufend - GLUE_LENGTH / 2 - lastSync;
-//         stream.next_frame = stream.bufend - GLUE_LENGTH / 2 - left;
-//         stream.sync = 1;
-        
-//         mad_bitptr next_frame;
-//         mad_bit_init(&next_frame, stream.next_frame);
-//         stream.anc_ptr    = stream.ptr;
-//         stream.anc_bitlen = mad_bit_length(&stream.ptr, &next_frame);
-//         mad_bit_finish(&next_frame);
-//         
-//         std::cout << ", MD_LENGTH_AFTER: " << stream.anc_bitlen << std::endl;
-        
-        lastSync = -1;
-    }
-    //mad_stream_skip(&stream, left);
     stream.error = MAD_ERROR_NONE;
     
-    //std::cout << "SKIPLEN (" << stream.skiplen << ")" << std::endl;
-    
     std::cout << "Freeing the drained fragment" << std::endl;
     free(pending[0].ptr);
     pending.pop_front();
 }
+
+void Decoder::switchBuffer(uint8_t* bufferPtr, uint32_t length)
+{
+    uint32_t left;
+    if (stream.error != MAD_ERROR_BUFLEN) {
+        std::cout << "WARNING: Switching buffers while the previous one is not drained, error: " << mad_stream_errorstr(&stream) << std::endl;
+    }
+    if (stream.next_frame != NULL) {
+        left = stream.bufend - stream.next_frame;
+    } else {
+        std::cout << "WARNING: not supposed to happen" << std::endl;
+    }
+    
+    if (left > GLUE_LENGTH / 2) {
+        std::cout << "Error: bytes to read in the buffer are more then glue buffer can fit (" << left << ")" << std::endl;
+        throw 1;
+    }
+    mad_stream_buffer(&stream, bufferPtr + GLUE_LENGTH / 2 - left, length - (GLUE_LENGTH / 2 - left));
+    
+    stream.error = MAD_ERROR_NONE;
+}

decoder.h

@@ -45,7 +45,9 @@ private:
     uint32_t cachedLength;
     uint16_t samplesPerFrame;
     uint8_t* glue;
-    int32_t lastSync;
+    uint8_t const* cachedNext;
+    uint8_t const* cachedThis;
+    mad_error cachedError;
     bool cached;
     
     mad_synth synth;
@@ -61,6 +63,7 @@ private:
     void prepareNextBuffer();
     void initializeProbe(mad_stream& probe);
     void switchToGlue();
+    void switchBuffer(uint8_t* bufferPtr, uint32_t length);
 };
 
 #endif // DECODER_H

index.html

@@ -30,7 +30,8 @@
             createFileFragments(reader.result);
             
             scheduleData();
-            ctx.resume();
+            
+            setTimeout(.bind(ctx), 1000);
         }
         reader.readAsArrayBuffer(file);