improved format support for MAD files

io/previewgenerator.cpp

@@ -18,13 +18,11 @@ extern "C" {
 #include <libswresample/swresample.h>
 }
 
-PreviewGenerator::PreviewGenerator(QTreeWidgetItem* i, Media* m) : QThread(0), fmt_ctx(NULL), item(i), media(m) {
+PreviewGenerator::PreviewGenerator(QTreeWidgetItem* i, Media* m) : QThread(0), fmt_ctx(NULL), item(i), media(m), retrieve_duration(false), contains_still_image(false) {
     connect(this, SIGNAL(finished()), this, SLOT(deleteLater()));
 }
 
 void PreviewGenerator::parse_media() {
-    bool contains_still_image = false;
-
     // detect video/audio streams in file
     for (int i=0;i<(int)fmt_ctx->nb_streams;i++) {
         // Find the decoder for the video stream
@@ -63,6 +61,14 @@ void PreviewGenerator::parse_media() {
     }
     media->length = fmt_ctx->duration;
 
+	if (fmt_ctx->duration == INT64_MIN) {
+		retrieve_duration = true;
+	} else {
+		finalize_media();
+	}
+}
+
+void PreviewGenerator::finalize_media() {
 	media->ready = true;
 
 	if (media->video_tracks.size() == 0) {
@@ -83,6 +89,7 @@ void PreviewGenerator::generate_waveform() {
     SwrContext* swr_ctx;
     AVFrame* temp_frame = av_frame_alloc();
     AVCodecContext** codec_ctx = new AVCodecContext* [fmt_ctx->nb_streams];
+	int64_t* media_lengths = new int64_t[fmt_ctx->nb_streams]{0};
     for (unsigned int i=0;i<fmt_ctx->nb_streams;i++) {
         codec_ctx[i] = NULL;
         if (fmt_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO || fmt_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
@@ -125,8 +132,9 @@ void PreviewGenerator::generate_waveform() {
 		}
         if (!end_of_file) {
             MediaStream* s = media->get_stream_from_file_index(packet.stream_index);
-            if (s != NULL && !s->preview_done) {
+			if (s != NULL) {
 				if (fmt_ctx->streams[packet.stream_index]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
+					if (!s->preview_done) {
 						int dstH = 120;
 						int dstW = dstH * ((float)temp_frame->width/(float)temp_frame->height);
 						uint8_t* data = new uint8_t[dstW*dstH*3];
@@ -156,8 +164,12 @@ void PreviewGenerator::generate_waveform() {
 
 						sws_freeContext(sws_ctx);
 
+						if (!retrieve_duration) {
 							avcodec_close(codec_ctx[packet.stream_index]);
 							codec_ctx[packet.stream_index] = NULL;
+						}
+					}
+					media_lengths[packet.stream_index]++;
 				} else if (fmt_ctx->streams[packet.stream_index]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
 					int interval = qFloor((temp_frame->sample_rate/WAVEFORM_RESOLUTION)/4)*4;
 
@@ -195,19 +207,20 @@ void PreviewGenerator::generate_waveform() {
 									min = sample;
 								}
 							}
-                            min /= 256;
-                            max /= 256;
-                            s->audio_preview.append(min);
-                            s->audio_preview.append(max);
+							s->audio_preview.append(min >> 8);
+							s->audio_preview.append(max >> 8);
 						}
 					}
 
 					swr_free(&swr_ctx);
 					av_frame_free(&swr_frame);
 				}
+			}
 
 			// check if we've got all our previews
-                if (media->audio_tracks.size() == 0) {
+			if (retrieve_duration) {
+				done = false;
+			} else if (media->audio_tracks.size() == 0) {
 				done = true;
 				for (int i=0;i<media->video_tracks.size();i++) {
 					if (!media->video_tracks.at(i)->preview_done) {
@@ -220,7 +233,6 @@ void PreviewGenerator::generate_waveform() {
 					break;
 				}
 			}
-            }
             av_packet_unref(&packet);
         }
     }
@@ -233,6 +245,18 @@ void PreviewGenerator::generate_waveform() {
             avcodec_close(codec_ctx[i]);
         }
 	}
+	if (retrieve_duration) {
+		media->length = 0;
+		int maximum_stream = 0;
+		for (unsigned int i=0;i<fmt_ctx->nb_streams;i++) {
+			if (media_lengths[i] > media_lengths[maximum_stream]) {
+				maximum_stream = i;
+			}
+		}
+		media->length = (double) media_lengths[maximum_stream] / av_q2d(fmt_ctx->streams[maximum_stream]->avg_frame_rate) * AV_TIME_BASE;
+		finalize_media();
+	}
+	delete [] media_lengths;
     delete [] codec_ctx;
 }
 

io/previewgenerator.h

@@ -23,9 +23,12 @@ signals:
 private:
     void parse_media();
     void generate_waveform();
+	void finalize_media();
     QTreeWidgetItem* item;
     Media* media;
     AVFormatContext* fmt_ctx;
+	bool retrieve_duration;
+	bool contains_still_image;
 };
 
 #endif // PREVIEWGENERATOR_H

mainwindow.cpp

@@ -436,7 +436,7 @@ void MainWindow::on_actionCrash_triggered()
         temp->snapped = true;
         int* kek;
         kek[5] = 69;
-        kek[99999] = 420;
+		kek[99999] = kek[5];
         delete temp;
     }
 }