From 49993e6f9c77bf4c610b53e3abc4ce5651c7700b Mon Sep 17 00:00:00 2001
From: Comment <tim@gray.(none)>
Date: Thu, 21 Mar 2013 22:05:38 +0000
Subject: wrestling with libavcodec

---
 rotord/rotor.cpp | 43 ++++++++++++++++++++++++++-----------------
 1 file changed, 26 insertions(+), 17 deletions(-)

(limited to 'rotord/rotor.cpp')

diff --git a/rotord/rotor.cpp b/rotord/rotor.cpp
index 07ea2b7..81b0716 100644
--- a/rotord/rotor.cpp
+++ b/rotord/rotor.cpp
@@ -307,10 +307,12 @@ bool Render_context::load_audio(const string &filename,vector<base_audio_process
 	
 	av_dump_format(avFormat.get(), 0, 0, false); //avformat.h line 1256
 
+	
+	
 	AVStream* stream = nullptr;
 	for (unsigned int i = 0; i < avFormat->nb_streams; ++i) {
 		if (avFormat->streams[i]->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
-			// we've found a video stream!
+			// we've found a stream!
 			stream = avFormat->streams[i];
 			break;
 		}
@@ -332,37 +334,37 @@ bool Render_context::load_audio(const string &filename,vector<base_audio_process
 	// allocating a structure
 	std::shared_ptr<AVCodecContext> audioCodec(avcodec_alloc_context3(codec), [](AVCodecContext* c) { avcodec_close(c); av_free(c); });
 
-	/* extradata???
+	// extradata???
 	// we need to make a copy of videoStream->codec->extradata and give it to the context
 	// make sure that this vector exists as long as the avVideoCodec exists
-	std::vector codecContextExtraData(stream->codec->extradata, stream->codec->extradata + stream->codec->extradata_size);
-	audioCodec->extradata = reinterpret_cast(codecContextExtraData.data());
+	std::vector<uint8_t> codecContextExtraData;
+	codecContextExtraData.assign(stream->codec->extradata, stream->codec->extradata + stream->codec->extradata_size);
+	
+	audioCodec->extradata = reinterpret_cast<uint8_t*>(codecContextExtraData.data());
 	audioCodec->extradata_size = codecContextExtraData.size();
 
 	// initializing the structure by opening the codec
-	if (avcodec_open2(avVideoCodec.get(), codec, nullptr) < 0) {
+	if (avcodec_open2(audioCodec.get(), codec, nullptr) < 0) {
 		cerr <<"Rotor: Could not open codec"<< endl;
 		return false;
 	}
-	*/
 	
-	//avcodec.h line 1026
 	
+	//avcodec.h line 1026
 	
-	Packet packet(avFormat.get());
-	if (packet.packet.data == nullptr) {
-		//done
-		return true;
-	}
-	
-	cerr << "audio codec context -  sample rate: "<< audioCodec->sample_rate <<", channels: "<<audioCodec->channels<<", sample format: "<<audioCodec->sample_fmt<<endl;
 	
+	Packet packet;
+
+// decoding code here
+	//cerr << "audio codec context -  sample rate: "<< audioCodec->sample_rate <<", channels: "<<audioCodec->channels<<", sample format: "<<audioCodec->sample_fmt<<endl;
 	
+	/* suspect why was this in twice 210313
 	do {
 		packet.reset(avFormat.get());
 		if (packet.packet.stream_index != stream->index)
-			continue;	// the packet is not about the video stream we want, let's jump again the start of the loop
+			continue;	// the packet is not about the stream we want, let's jump again the start of the loop
 	} while(0);
+	*/
 	
 	// allocating an AVFrame
 	std::shared_ptr<AVFrame> avFrame(avcodec_alloc_frame(), &av_free);
@@ -401,8 +403,15 @@ bool Render_context::load_audio(const string &filename,vector<base_audio_process
 		// sending data to libavcodec
 		int isFrameAvailable = 0;
 		//const auto processedLength = avcodec_decode_video2(avVideoCodec.get(), avFrame.get(), &isFrameAvailable, &packetToSend);
+		
 		const auto processedLength = avcodec_decode_audio4(audioCodec.get(), avFrame.get(), &isFrameAvailable, &packetToSend);
-
+/*
+		unsigned int bitsPerSample = av_get_bytes_per_sample(stream.codecContext->sample_fmt) * CHAR_BIT;    // 16 or 32
+		unsigned int numberOfChannels = stream.codecContext->channels;     // 1 for mono, 2 for stereo, or more
+		unsigned int numberOfSamplesContainedInTheFrame = stream.frame->nb_samples * stream.codecContext->channels;
+		unsigned int numberOfSamplesToPlayPerSecond = stream.codecContext->sample_rate;   // usually 44100 or 48000
+		const void* data = stream.frame->data[0];
+		*/
 		
 		if (processedLength < 0) {
 			//av_free_packet(&packet); shouldn't have to because of type safe wrapper
@@ -410,7 +419,7 @@ bool Render_context::load_audio(const string &filename,vector<base_audio_process
 			return false;
 		}
 		offsetInData += processedLength;
-
+		
 		/*
 		// processing the image if available
 		if (isFrameAvailable) {
-- 
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