From 98e9e8998f8fe1f9793610b58bb4e5e8f8145526 Mon Sep 17 00:00:00 2001
From: Tim Redfern <tim@eclectronics.org>
Date: Fri, 14 Jun 2013 14:48:34 +0100
Subject: variable size video decoder

---
 rotord/libavwrapper.cpp | 70 ++++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 58 insertions(+), 12 deletions(-)

(limited to 'rotord/libavwrapper.cpp')

diff --git a/rotord/libavwrapper.cpp b/rotord/libavwrapper.cpp
index 5e767e0..a5f2111 100755
--- a/rotord/libavwrapper.cpp
+++ b/rotord/libavwrapper.cpp
@@ -215,6 +215,33 @@ bool libav::decoder::openUsingInitializedContainer(enum PixelFormat formatParam)
     /* duration is in microsecs */
     numFrames = (int)(( container->duration / (double)AV_TIME_BASE ) * pCtx->time_base.den + 0.5);
 
+    init_buffers_and_scaler();
+
+    /* Give some info on stderr about the file & stream */
+    //dump_format(container, 0, fname, 0);
+
+    previousFrameIndex = -1;
+    return true;
+}
+bool libav::decoder::reinit_buffers_and_scaler(){
+    mutex.lock();
+    if (NULL != Sctx) {
+        sws_freeContext(Sctx);
+        Sctx = NULL;
+    }
+    if (NULL != pRaw) {
+        av_free(pRaw);
+        pRaw = NULL;
+    }
+    if (NULL != pFrameRGB) {
+        av_free(pFrameRGB);
+        pFrameRGB = NULL;
+    }
+    mutex.unlock();
+    init_buffers_and_scaler();
+}
+
+bool libav::decoder::init_buffers_and_scaler(){
     /* Get framebuffers */
     if (! (pRaw = avcodec_alloc_frame()) )
         throw std::runtime_error("");
@@ -230,7 +257,7 @@ bool libav::decoder::openUsingInitializedContainer(enum PixelFormat formatParam)
         Sctx = NULL;
     }
     else {
-        numBytes = avpicture_get_size( format, pCtx->width, pCtx->height ); // RGB24 format
+        numBytes = avpicture_get_size( format, width, height ); // RGB24 format
         if (! (buffer   = (uint8_t*)av_malloc(numBytes + FF_INPUT_BUFFER_PADDING_SIZE)) ) // RGB24 format
             throw std::runtime_error("");
         if (! (blank    = (uint8_t*)av_mallocz(avpicture_get_size(pCtx->pix_fmt,width,height))) ) // native codec format
@@ -238,7 +265,7 @@ bool libav::decoder::openUsingInitializedContainer(enum PixelFormat formatParam)
 
         /* Init buffers */
         avpicture_fill( (AVPicture * ) pFrameRGB, buffer, format,
-                        pCtx->width, pCtx->height );
+                        width, height );
 
         /* Init scale & convert */
         if (! (Sctx=sws_getContext(
@@ -252,12 +279,18 @@ bool libav::decoder::openUsingInitializedContainer(enum PixelFormat formatParam)
                 NULL,NULL,NULL)) )
             throw std::runtime_error("");
     }
+}
 
-    /* Give some info on stderr about the file & stream */
-    //dump_format(container, 0, fname, 0);
+bool libav::decoder::fetchFrame(int w, int h,int targetFrameIndex)
+{
+    if (w!=width||h!=height){
+        width=w;
+        height=h;
+        cerr<<"libav::decoder reiniting to "<<width<<"x"<<height<<endl; //does not seem to be aware of wrong frame
+        reinit_buffers_and_scaler();
+    }
 
-    previousFrameIndex = -1;
-    return true;
+    fetchFrame(targetFrameIndex);
 }
 
 bool libav::decoder::fetchFrame(int targetFrameIndex)
@@ -1434,7 +1467,10 @@ bool libav::audioloader::setup(const std::string &filename){
         std::cout << "This stream has " << codecContext->channels << " channels, a sample rate of " << codecContext->sample_rate << "Hz and "<<samples <<" samples" << std::endl;
         std::cout << "The data is in format " <<codecContext->sample_fmt<< " (aka "<< av_get_sample_fmt_name(codecContext->sample_fmt) << ") "<<std::endl;
 
-        if(av_sample_fmt_is_planar(codecContext->sample_fmt)) cerr<<"found planar audio"<<endl;
+        isPlanar=(av_sample_fmt_is_planar(codecContext->sample_fmt)==1);
+
+        if(isPlanar) { cerr<<"found planar audio"<<endl; }
+
 
         av_init_packet(&packet);
         //sample_processed=0;
@@ -1522,20 +1558,30 @@ bool libav::audioloader::setup(const std::string &filename){
                 for (int j=0;j<channels;j++) {
                     //int frame->format
                     //format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames, enum AVSampleFormat for audio)
-                    int ff=frame->format;
+                    //int ff=frame->format;
                     //uint64_t frame->channel_layout
                     //Channel layout of the audio data.
-                    uint64_t fcl=frame->channel_layout;
+                    //uint64_t fcl=frame->channel_layout;
                     //int frame->nb_extended_buf
                     //Number of elements in extended_buf.
-                    int fnb=frame->nb_extended_buf;
+                    //int fnb=frame->nb_extended_buf;
                     //int frame->decode_error_flags
                     //decode error flags of the frame, set to a combination of FF_DECODE_ERROR_xxx flags if the decoder produced a frame, but there were errors during the decoding.
-                    int fde=frame->decode_error_flags;
+                    //int fde=frame->decode_error_flags;
 
 
                     //uint16_t s=((uint16_t*) frame->buf[j]->data)[i];
-                    uint16_t s=((uint16_t*) frame->buf[0]->data)[j*channels+i];
+                    uint16_t s;
+                    if (isPlanar) {
+                         s=((uint16_t*) frame->buf[j]->data)[i];
+                    }else {
+                         s=((uint16_t*) frame->buf[0]->data)[j*channels+i];
+                    }
+
+                    //where is audio grunge coming from? signed/ unsigned? doesn't seem to be byte order..
+                    // add +1 to data subscript with no effect
+
+                   
                     //which? must be determined by format or layout of the channels
                     //ALSO some kind of HEINOUS memory leak??
                     buffer[((sample_end+i)*frame->channels)+j]=s;
-- 
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