#include "ffmpeg_decoder.h"

#include <iostream>

DecoderFFmpeg::DecoderFFmpeg(const std::string& filename) {
	av_register_all();
	
	std::cerr << "Opening file: " << av_open_input_file(&lavf_ctx, filename.c_str(), 0, 0, 0) << std::endl;
	
	av_find_stream_info(lavf_ctx);
	
	dump_format(lavf_ctx, 0, filename.c_str(), 0);
	
	lavc_ctx = lavf_ctx->streams[0]->codec;
	codec = avcodec_find_decoder(lavc_ctx->codec_id);
	
	std::cerr << "Opening decoder: " << avcodec_open(lavc_ctx, codec) << std::endl;
}

DecoderFFmpeg::~DecoderFFmpeg() {
	
}

std::size_t DecoderFFmpeg::read(char* buf, std::size_t buf_size) {
	AVPacket packet;
	
	av_read_packet(lavf_ctx, &packet);
	
	int len = avcodec_decode_audio3(lavc_ctx, (int16_t*)buf, (int*)&buf_size, &packet);
	
	std::cerr << "Decoded " << len << " bytes of data to " << buf_size << " bytes of raw data." << std::endl;
	
	av_free_packet(&packet);
	
	return buf_size;
}