读取PC端摄像头数据并进行编码和流媒体传输

#define USEFILTER 0
	#include <stdio.h>
	#include <conio.h>
	#include <windows.h>
	#define snprintf _snprintf
	extern "C"
	{
	#include "libavutil/opt.h"
	#include "libavutil/time.h"
	#include "libavutil/mathematics.h"
	#include "libavcodec/avcodec.h"
	#include "libavformat/avformat.h"
	#include "libavdevice/avdevice.h"
	#include "libswscale/swscale.h"
	#include "libswresample/swresample.h"
	#include "libavutil/audio_fifo.h"
	#if USEFILTER
	#include "libavfilter/avfiltergraph.h"
	#include "libavfilter/buffersink.h"
	#include "libavfilter/buffersrc.h"
	#endif
	};
	char *dup_wchar_to_utf8(const wchar_t *w)
	{
	char *s = NULL;
	int l = WideCharToMultiByte(CP_UTF8, 0, w, -1, 0, 0, 0, 0);
	s = (char *)av_malloc(l);
	if (s)
	WideCharToMultiByte(CP_UTF8, 0, w, -1, s, l, 0, 0);
	return s;
	}
	int flush_encoder(AVFormatContext *ifmt_ctx, AVFormatContext *ofmt_ctx, unsigned int stream_index, int framecnt);
	int flush_encoder_a(AVFormatContext *ifmt_ctx_a, AVFormatContext *ofmt_ctx, unsigned int stream_index, int nb_samples);
	int exit_thread = 0;
	#if USEFILTER
	int filter_change = 1;
	const char *filter_descr = "null";
	const char *filter_mirror = "crop=iw/2:ih:0:0,split[left][tmp];[tmp]hflip[right]; \
	[left]pad=iw*2[a];[a][right]overlay=w";
	const char *filter_watermark = "movie=test.jpg[wm];[in][wm]overlay=5:5[out]";
	const char *filter_negate = "negate[out]";
	const char *filter_edge = "edgedetect[out]";
	const char *filter_split4 = "scale=iw/2:ih/2[in_tmp];[in_tmp]split=4[in_1][in_2][in_3][in_4];[in_1]pad=iw*2:ih*2[a];[a][in_2]overlay=w[b];[b][in_3]overlay=0:h[d];[d][in_4]overlay=w:h[out]";
	const char *filter_vintage = "curves=vintage";
	typedef enum{
	FILTER_NULL = 48,
	FILTER_MIRROR,
	FILTER_WATERMATK,
	FILTER_NEGATE,
	FILTER_EDGE,
	FILTER_SPLIT4,
	FILTER_VINTAGE
	}FILTERS;
	AVFilterContext *buffersink_ctx;
	AVFilterContext *buffersrc_ctx;
	AVFilterGraph *filter_graph;
	AVFilter *buffersrc;
	AVFilter *buffersink;
	AVFrame* picref;
	#endif
	DWORD WINAPI MyThreadFunction(LPVOID lpParam)
	{
	#if USEFILTER
	int ch = getchar();
	while (ch != '\n')
	{
	switch (ch){
	case FILTER_NULL:
	{
	printf("\nnow using null filter\nPress other numbers for other filters:");
	filter_change = 1;
	filter_descr = "null";
	getchar();
	ch = getchar();
	break;
	}
	case FILTER_MIRROR:
	{
	printf("\nnow using mirror filter\nPress other numbers for other filters:");
	filter_change = 1;
	filter_descr = filter_mirror;
	getchar();
	ch = getchar();
	break;
	}
	case FILTER_WATERMATK:
	{
	printf("\nnow using watermark filter\nPress other numbers for other filters:");
	filter_change = 1;
	filter_descr = filter_watermark;
	getchar();
	ch = getchar();
	break;
	}
	case FILTER_NEGATE:
	{
	printf("\nnow using negate filter\nPress other numbers for other filters:");
	filter_change = 1;
	filter_descr = filter_negate;
	getchar();
	ch = getchar();
	break;
	}
	case FILTER_EDGE:
	{
	printf("\nnow using edge filter\nPress other numbers for other filters:");
	filter_change = 1;
	filter_descr = filter_edge;
	getchar();
	ch = getchar();
	break;
	}
	case FILTER_SPLIT4:
	{
	printf("\nnow using split4 filter\nPress other numbers for other filters:");
	filter_change = 1;
	filter_descr = filter_split4;
	getchar();
	ch = getchar();
	break;
	}
	case FILTER_VINTAGE:
	{
	printf("\nnow using vintage filter\nPress other numbers for other filters:");
	filter_change = 1;
	filter_descr = filter_vintage;
	getchar();
	ch = getchar();
	break;
	}
	default:
	{
	getchar();
	ch = getchar();
	break;
	}
	}
	#else
	while ((getchar()) != '\n')
	{
	;
	#endif
	}
	exit_thread = 1;
	return 0;
	}
	//Show Device
	void show_dshow_device(){
	AVFormatContext *pFmtCtx = avformat_alloc_context();
	AVDictionary* options = NULL;
	av_dict_set(&options, "list_devices", "true", 0);
	AVInputFormat *iformat = av_find_input_format("dshow");
	printf("Device Info=============\n");
	avformat_open_input(&pFmtCtx, "video=dummy", iformat, &options);
	printf("========================\n");
	}
	#if USEFILTER
	static int apply_filters(AVFormatContext *ifmt_ctx)
	{
	char args[512];
	int ret;
	AVFilterInOut *outputs = avfilter_inout_alloc();
	if (!outputs)
	{
	printf("Cannot alloc output\n");
	return -1;
	}
	AVFilterInOut *inputs = avfilter_inout_alloc();
	if (!inputs)
	{
	printf("Cannot alloc input\n");
	return -1;
	}
	if (filter_graph)
	avfilter_graph_free(&filter_graph);
	filter_graph = avfilter_graph_alloc();
	if (!filter_graph)
	{
	printf("Cannot create filter graph\n");
	return -1;
	}
	/* buffer video source: the decoded frames from the decoder will be inserted here. */
	snprintf(args, sizeof(args),
	"video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:pixel_aspect=%d/%d",
	ifmt_ctx->streams[0]->codec->width, ifmt_ctx->streams[0]->codec->height, ifmt_ctx->streams[0]->codec->pix_fmt,
	ifmt_ctx->streams[0]->time_base.num, ifmt_ctx->streams[0]->time_base.den,
	ifmt_ctx->streams[0]->codec->sample_aspect_ratio.num, ifmt_ctx->streams[0]->codec->sample_aspect_ratio.den);
	ret = avfilter_graph_create_filter(&buffersrc_ctx, buffersrc, "in",
	args, NULL, filter_graph);
	if (ret < 0) {
	printf("Cannot create buffer source\n");
	return ret;
	}
	/* buffer video sink: to terminate the filter chain. */
	ret = avfilter_graph_create_filter(&buffersink_ctx, buffersink, "out",
	NULL, NULL, filter_graph);
	if (ret < 0) {
	printf("Cannot create buffer sink\n");
	return ret;
	}
	/* Endpoints for the filter graph. */
	outputs->name = av_strdup("in");
	outputs->filter_ctx = buffersrc_ctx;
	outputs->pad_idx = 0;
	outputs->next = NULL;
	inputs->name = av_strdup("out");
	inputs->filter_ctx = buffersink_ctx;
	inputs->pad_idx = 0;
	inputs->next = NULL;
	if ((ret = avfilter_graph_parse_ptr(filter_graph, filter_descr,
	&inputs, &outputs, NULL)) < 0)
	return ret;
	if ((ret = avfilter_graph_config(filter_graph, NULL)) < 0)
	return ret;
	avfilter_inout_free(&inputs);
	avfilter_inout_free(&outputs);
	return 0;
	}
	#endif
	int main(int argc, char* argv[])
	{
	AVFormatContext *ifmt_ctx = NULL;
	AVFormatContext *ifmt_ctx_a = NULL;
	AVFormatContext *ofmt_ctx;
	AVInputFormat* ifmt;
	AVStream* video_st;
	AVStream* audio_st;
	AVCodecContext* pCodecCtx;
	AVCodecContext* pCodecCtx_a;
	AVCodec* pCodec;
	AVCodec* pCodec_a;
	AVPacket *dec_pkt, enc_pkt;
	AVPacket *dec_pkt_a, enc_pkt_a;
	AVFrame *pframe, *pFrameYUV;
	struct SwsContext *img_convert_ctx;
	struct SwrContext *aud_convert_ctx;
	char capture_name[80] = { 0 };
	char device_name[80] = { 0 };
	char device_name_a[80] = { 0 };
	int framecnt = 0;
	int nb_samples = 0;
	int videoindex;
	int audioindex;
	int i;
	int ret;
	HANDLE hThread;
	const char* out_path = "rtmp://localhost/live/livestream";
	int dec_got_frame, enc_got_frame;
	int dec_got_frame_a, enc_got_frame_a;
	int aud_next_pts = 0;
	int vid_next_pts = 0;
	int encode_video = 1, encode_audio = 1;
	AVRational time_base_q = { 1, AV_TIME_BASE };
	av_register_all();
	//Register Device
	avdevice_register_all();
	avformat_network_init();
	#if USEFILTER
	//Register Filter
	avfilter_register_all();
	buffersrc = avfilter_get_by_name("buffer");
	buffersink = avfilter_get_by_name("buffersink");
	#endif
	//Show Dshow Device
	show_dshow_device();
	printf("\nChoose video capture device: ");
	if (gets(capture_name) == 0)
	{
	printf("Error in gets()\n");
	return -1;
	}
	sprintf(device_name, "video=%s", capture_name);
	printf("\nChoose audio capture device: ");
	if (gets(capture_name) == 0)
	{
	printf("Error in gets()\n");
	return -1;
	}
	sprintf(device_name_a, "audio=%s", capture_name);
	//wchar_t *cam = L"video=Integrated Camera";
	//wchar_t *cam = L"video=YY伴侣";
	//char *device_name_utf8 = dup_wchar_to_utf8(cam);
	//wchar_t *cam_a = L"audio=麦克风阵列 (Realtek High Definition Audio)";
	//char *device_name_utf8_a = dup_wchar_to_utf8(cam_a);
	ifmt = av_find_input_format("dshow");
	// Set device params
	AVDictionary *device_param = 0;
	//if not setting rtbufsize, error messages will be shown in cmd, but you can still watch or record the stream correctly in most time
	//setting rtbufsize will erase those error messages, however, larger rtbufsize will bring latency
	//av_dict_set(&device_param, "rtbufsize", "10M", 0);
	//Set own video device's name
	if (avformat_open_input(&ifmt_ctx, device_name, ifmt, &device_param) != 0){
	printf("Couldn't open input video stream.（无法打开输入流）\n");
	return -1;
	}
	//Set own audio device's name
	if (avformat_open_input(&ifmt_ctx_a, device_name_a, ifmt, &device_param) != 0){
	printf("Couldn't open input audio stream.（无法打开输入流）\n");
	return -1;
	}
	//input video initialize
	if (avformat_find_stream_info(ifmt_ctx, NULL) < 0)
	{
	printf("Couldn't find video stream information.（无法获取流信息）\n");
	return -1;
	}
	videoindex = -1;
	for (i = 0; i < ifmt_ctx->nb_streams; i++)
	if (ifmt_ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO)
	{
	videoindex = i;
	break;
	}
	if (videoindex == -1)
	{
	printf("Couldn't find a video stream.（没有找到视频流）\n");
	return -1;
	}
	if (avcodec_open2(ifmt_ctx->streams[videoindex]->codec, avcodec_find_decoder(ifmt_ctx->streams[videoindex]->codec->codec_id), NULL) < 0)
	{
	printf("Could not open video codec.（无法打开解码器）\n");
	return -1;
	}
	//input audio initialize
	if (avformat_find_stream_info(ifmt_ctx_a, NULL) < 0)
	{
	printf("Couldn't find audio stream information.（无法获取流信息）\n");
	return -1;
	}
	audioindex = -1;
	for (i = 0; i < ifmt_ctx_a->nb_streams; i++)
	if (ifmt_ctx_a->streams[i]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
	{
	audioindex = i;
	break;
	}
	if (audioindex == -1)
	{
	printf("Couldn't find a audio stream.（没有找到视频流）\n");
	return -1;
	}
	if (avcodec_open2(ifmt_ctx_a->streams[audioindex]->codec, avcodec_find_decoder(ifmt_ctx_a->streams[audioindex]->codec->codec_id), NULL) < 0)
	{
	printf("Could not open audio codec.（无法打开解码器）\n");
	return -1;
	}
	//output initialize
	avformat_alloc_output_context2(&ofmt_ctx, NULL, "flv", out_path);
	//output video encoder initialize
	pCodec = avcodec_find_encoder(AV_CODEC_ID_H264);
	if (!pCodec){
	printf("Can not find output video encoder! (没有找到合适的编码器！)\n");
	return -1;
	}
	pCodecCtx = avcodec_alloc_context3(pCodec);
	pCodecCtx->pix_fmt = PIX_FMT_YUV420P;
	pCodecCtx->width = ifmt_ctx->streams[videoindex]->codec->width;
	pCodecCtx->height = ifmt_ctx->streams[videoindex]->codec->height;
	pCodecCtx->time_base.num = 1;
	pCodecCtx->time_base.den = 25;
	pCodecCtx->bit_rate = 300000;
	pCodecCtx->gop_size = 250;
	/* Some formats want stream headers to be separate. */
	if (ofmt_ctx->oformat->flags & AVFMT_GLOBALHEADER)
	pCodecCtx->flags |= CODEC_FLAG_GLOBAL_HEADER;
	//H264 codec param
	//pCodecCtx->me_range = 16;
	//pCodecCtx->max_qdiff = 4;
	//pCodecCtx->qcompress = 0.6;
	pCodecCtx->qmin = 10;
	pCodecCtx->qmax = 51;
	//Optional Param
	pCodecCtx->max_b_frames = 0;
	// Set H264 preset and tune
	AVDictionary *param = 0;
	av_dict_set(¶m, "preset", "fast", 0);
	av_dict_set(¶m, "tune", "zerolatency", 0);
	if (avcodec_open2(pCodecCtx, pCodec, ¶m) < 0){
	printf("Failed to open output video encoder! (编码器打开失败！)\n");
	return -1;
	}
	//Add a new stream to output,should be called by the user before avformat_write_header() for muxing
	video_st = avformat_new_stream(ofmt_ctx, pCodec);
	if (video_st == NULL){
	return -1;
	}
	video_st->time_base.num = 1;
	video_st->time_base.den = 25;
	video_st->codec = pCodecCtx;
	//output audio encoder initialize
	pCodec_a = avcodec_find_encoder(AV_CODEC_ID_AAC);
	if (!pCodec_a){
	printf("Can not find output audio encoder! (没有找到合适的编码器！)\n");
	return -1;
	}
	pCodecCtx_a = avcodec_alloc_context3(pCodec_a);
	pCodecCtx_a->channels = 2;
	pCodecCtx_a->channel_layout = av_get_default_channel_layout(2);
	pCodecCtx_a->sample_rate = ifmt_ctx_a->streams[audioindex]->codec->sample_rate;
	pCodecCtx_a->sample_fmt = pCodec_a->sample_fmts[0];
	pCodecCtx_a->bit_rate = 32000;
	pCodecCtx_a->time_base.num = 1;
	pCodecCtx_a->time_base.den = pCodecCtx_a->sample_rate;
	/** Allow the use of the experimental AAC encoder */
	pCodecCtx_a->strict_std_compliance = FF_COMPLIANCE_EXPERIMENTAL;
	/* Some formats want stream headers to be separate. */
	if (ofmt_ctx->oformat->flags & AVFMT_GLOBALHEADER)
	pCodecCtx_a->flags |= CODEC_FLAG_GLOBAL_HEADER;
	if (avcodec_open2(pCodecCtx_a, pCodec_a, NULL) < 0){
	printf("Failed to open ouput audio encoder! (编码器打开失败！)\n");
	return -1;
	}
	//Add a new stream to output,should be called by the user before avformat_write_header() for muxing
	audio_st = avformat_new_stream(ofmt_ctx, pCodec_a);
	if (audio_st == NULL){
	return -1;
	}
	audio_st->time_base.num = 1;
	audio_st->time_base.den = pCodecCtx_a->sample_rate;
	audio_st->codec = pCodecCtx_a;
	//Open output URL,set before avformat_write_header() for muxing
	if (avio_open(&ofmt_ctx->pb, out_path, AVIO_FLAG_READ_WRITE) < 0){
	printf("Failed to open output file! (输出文件打开失败！)\n");
	return -1;
	}
	//Show some Information
	av_dump_format(ofmt_ctx, 0, out_path, 1);
	//Write File Header
	avformat_write_header(ofmt_ctx, NULL);
	//prepare before decode and encode
	dec_pkt = (AVPacket *)av_malloc(sizeof(AVPacket));
	#if USEFILTER
	#else
	//camera data may has a pix fmt of RGB or sth else,convert it to YUV420
	img_convert_ctx = sws_getContext(ifmt_ctx->streams[videoindex]->codec->width, ifmt_ctx->streams[videoindex]->codec->height,
	ifmt_ctx->streams[videoindex]->codec->pix_fmt, pCodecCtx->width, pCodecCtx->height, PIX_FMT_YUV420P, SWS_BICUBIC, NULL, NULL, NULL);
	// Initialize the resampler to be able to convert audio sample formats
	aud_convert_ctx = swr_alloc_set_opts(NULL,
	av_get_default_channel_layout(pCodecCtx_a->channels),
	pCodecCtx_a->sample_fmt,
	pCodecCtx_a->sample_rate,
	av_get_default_channel_layout(ifmt_ctx_a->streams[audioindex]->codec->channels),
	ifmt_ctx_a->streams[audioindex]->codec->sample_fmt,
	ifmt_ctx_a->streams[audioindex]->codec->sample_rate,
	0, NULL);
	/**
	* Perform a sanity check so that the number of converted samples is
	* not greater than the number of samples to be converted.
	* If the sample rates differ, this case has to be handled differently
	*/
	//av_assert0(pCodecCtx_a->sample_rate == ifmt_ctx_a->streams[audioindex]->codec->sample_rate);
	swr_init(aud_convert_ctx);
	#endif
	//Initialize the buffer to store YUV frames to be encoded.
	pFrameYUV = av_frame_alloc();
	uint8_t *out_buffer = (uint8_t *)av_malloc(avpicture_get_size(PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height));
	avpicture_fill((AVPicture *)pFrameYUV, out_buffer, PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height);
	//Initialize the FIFO buffer to store audio samples to be encoded.
	AVAudioFifo *fifo = NULL;
	fifo = av_audio_fifo_alloc(pCodecCtx_a->sample_fmt, pCodecCtx_a->channels, 1);
	//Initialize the buffer to store converted samples to be encoded.
	uint8_t **converted_input_samples = NULL;
	/**
	* Allocate as many pointers as there are audio channels.
	* Each pointer will later point to the audio samples of the corresponding
	* channels (although it may be NULL for interleaved formats).
	*/
	if (!(converted_input_samples = (uint8_t**)calloc(pCodecCtx_a->channels,
	sizeof(**converted_input_samples)))) {
	printf("Could not allocate converted input sample pointers\n");
	return AVERROR(ENOMEM);
	}
	printf("\n --------call started----------\n");
	#if USEFILTER
	printf("\n Press differnet number for different filters:");
	printf("\n 1->Mirror");
	printf("\n 2->Add Watermark");
	printf("\n 3->Negate");
	printf("\n 4->Draw Edge");
	printf("\n 5->Split Into 4");
	printf("\n 6->Vintage");
	printf("\n Press 0 to remove filter\n");
	#endif
	printf("\nPress enter to stop...\n");
	hThread = CreateThread(
	NULL, // default security attributes
	0, // use default stack size
	MyThreadFunction, // thread function name
	NULL, // argument to thread function
	0, // use default creation flags
	NULL); // returns the thread identifier
	//start decode and encode
	int64_t start_time = av_gettime();
	while (encode_video || encode_audio)
	{
	if (encode_video &&
	(!encode_audio || av_compare_ts(vid_next_pts, time_base_q,
	aud_next_pts, time_base_q) <= 0))
	{
	if ((ret=av_read_frame(ifmt_ctx, dec_pkt)) >= 0){
	if (exit_thread)
	break;
	av_log(NULL, AV_LOG_DEBUG, "Going to reencode the frame\n");
	pframe = av_frame_alloc();
	if (!pframe) {
	ret = AVERROR(ENOMEM);
	return ret;
	}
	ret = avcodec_decode_video2(ifmt_ctx->streams[dec_pkt->stream_index]->codec, pframe,
	&dec_got_frame, dec_pkt);
	if (ret < 0) {
	av_frame_free(&pframe);
	av_log(NULL, AV_LOG_ERROR, "Decoding failed\n");
	break;
	}
	if (dec_got_frame){
	#if USEFILTER
	pframe->pts = av_frame_get_best_effort_timestamp(pframe);
	if (filter_change)
	apply_filters(ifmt_ctx);
	filter_change = 0;
	/* push the decoded frame into the filtergraph */
	if (av_buffersrc_add_frame(buffersrc_ctx, pframe) < 0) {
	printf("Error while feeding the filtergraph\n");
	break;
	}
	picref = av_frame_alloc();
	/* pull filtered pictures from the filtergraph */
	while (1) {
	ret = av_buffersink_get_frame_flags(buffersink_ctx, picref, 0);
	if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
	break;
	if (ret < 0)
	return ret;
	if (picref) {
	img_convert_ctx = sws_getContext(picref->width, picref->height, (AVPixelFormat)picref->format, pCodecCtx->width, pCodecCtx->height, AV_PIX_FMT_YUV420P, SWS_BICUBIC, NULL, NULL, NULL);
	sws_scale(img_convert_ctx, (const uint8_t* const*)picref->data, picref->linesize, 0, pCodecCtx->height, pFrameYUV->data, pFrameYUV->linesize);
	sws_freeContext(img_convert_ctx);
	pFrameYUV->width = picref->width;
	pFrameYUV->height = picref->height;
	pFrameYUV->format = PIX_FMT_YUV420P;
	#else
	sws_scale(img_convert_ctx, (const uint8_t* const*)pframe->data, pframe->linesize, 0, pCodecCtx->height, pFrameYUV->data, pFrameYUV->linesize);
	pFrameYUV->width = pframe->width;
	pFrameYUV->height = pframe->height;
	pFrameYUV->format = PIX_FMT_YUV420P;
	#endif
	enc_pkt.data = NULL;
	enc_pkt.size = 0;
	av_init_packet(&enc_pkt);
	ret = avcodec_encode_video2(pCodecCtx, &enc_pkt, pFrameYUV, &enc_got_frame);
	av_frame_free(&pframe);
	if (enc_got_frame == 1){
	//printf("Succeed to encode frame: %5d\tsize:%5d\n", framecnt, enc_pkt.size);
	framecnt++;
	enc_pkt.stream_index = video_st->index;
	//Write PTS
	AVRational time_base = ofmt_ctx->streams[0]->time_base;//{ 1, 1000 };
	AVRational r_framerate1 = ifmt_ctx->streams[videoindex]->r_frame_rate;//{ 50, 2 };
	//Duration between 2 frames (us)
	int64_t calc_duration = (double)(AV_TIME_BASE)*(1 / av_q2d(r_framerate1)); //内部时间戳
	//Parameters
	//enc_pkt.pts = (double)(framecnt*calc_duration)*(double)(av_q2d(time_base_q)) / (double)(av_q2d(time_base));
	enc_pkt.pts = av_rescale_q(framecnt*calc_duration, time_base_q, time_base);
	enc_pkt.dts = enc_pkt.pts;
	enc_pkt.duration = av_rescale_q(calc_duration, time_base_q, time_base); //(double)(calc_duration)*(double)(av_q2d(time_base_q)) / (double)(av_q2d(time_base));
	enc_pkt.pos = -1;
	//printf("video pts : %d\n", enc_pkt.pts);
	vid_next_pts=framecnt*calc_duration; //general timebase
	//Delay
	int64_t pts_time = av_rescale_q(enc_pkt.pts, time_base, time_base_q);
	int64_t now_time = av_gettime() - start_time;
	if ((pts_time > now_time) && ((vid_next_pts + pts_time - now_time)
	av_usleep(pts_time - now_time);
	ret = av_interleaved_write_frame(ofmt_ctx, &enc_pkt);
	av_free_packet(&enc_pkt);
	}
	#if USEFILTER
	av_frame_unref(picref);
	}
	}
	#endif
	}
	else {
	av_frame_free(&pframe);
	}
	av_free_packet(dec_pkt);
	}
	else
	if (ret == AVERROR_EOF)
	encode_video = 0;
	else
	{
	printf("Could not read video frame\n");
	return ret;
	}
	}
	else
	{
	//audio trancoding here
	const int output_frame_size = pCodecCtx_a->frame_size;
	if (exit_thread)
	break;
	/**
	* Make sure that there is one frame worth of samples in the FIFO
	* buffer so that the encoder can do its work.
	* Since the decoder's and the encoder's frame size may differ, we
	* need to FIFO buffer to store as many frames worth of input samples
	* that they make up at least one frame worth of output samples.
	*/
	while (av_audio_fifo_size(fifo) < output_frame_size) {
	/**
	* Decode one frame worth of audio samples, convert it to the
	* output sample format and put it into the FIFO buffer.
	*/
	AVFrame *input_frame = av_frame_alloc();
	if (!input_frame)
	{
	ret = AVERROR(ENOMEM);
	return ret;
	}
	/** Decode one frame worth of audio samples. */
	/** Packet used for temporary storage. */
	AVPacket input_packet;
	av_init_packet(&input_packet);
	input_packet.data = NULL;
	input_packet.size = 0;
	/** Read one audio frame from the input file into a temporary packet. */
	if ((ret = av_read_frame(ifmt_ctx_a, &input_packet)) < 0) {
	/** If we are at the end of the file, flush the decoder below. */
	if (ret == AVERROR_EOF)
	{
	encode_audio = 0;
	}
	else
	{
	printf("Could not read audio frame\n");
	return ret;
	}
	}
	/**
	* Decode the audio frame stored in the temporary packet.
	* The input audio stream decoder is used to do this.
	* If we are at the end of the file, pass an empty packet to the decoder
	* to flush it.
	*/
	if ((ret = avcodec_decode_audio4(ifmt_ctx_a->streams[audioindex]->codec, input_frame,
	&dec_got_frame_a, &input_packet)) < 0) {
	printf("Could not decode audio frame\n");
	return ret;
	}
	av_packet_unref(&input_packet);
	/** If there is decoded data, convert and store it */
	if (dec_got_frame_a) {
	/**
	* Allocate memory for the samples of all channels in one consecutive
	* block for convenience.
	*/
	if ((ret = av_samples_alloc(converted_input_samples, NULL,
	pCodecCtx_a->channels,
	input_frame->nb_samples,
	pCodecCtx_a->sample_fmt, 0)) < 0) {
	printf("Could not allocate converted input samples\n");
	av_freep(&(*converted_input_samples)[0]);
	free(*converted_input_samples);
	return ret;
	}
	/**
	* Convert the input samples to the desired output sample format.
	* This requires a temporary storage provided by converted_input_samples.
	*/
	/** Convert the samples using the resampler. */
	if ((ret = swr_convert(aud_convert_ctx,
	converted_input_samples, input_frame->nb_samples,
	(const uint8_t**)input_frame->extended_data, input_frame->nb_samples)) < 0) {
	printf("Could not convert input samples\n");
	return ret;
	}
	/** Add the converted input samples to the FIFO buffer for later processing. */
	/**
	* Make the FIFO as large as it needs to be to hold both,
	* the old and the new samples.
	*/
	if ((ret = av_audio_fifo_realloc(fifo, av_audio_fifo_size(fifo) + input_frame->nb_samples)) < 0) {
	printf("Could not reallocate FIFO\n");
	return ret;
	}
	/** Store the new samples in the FIFO buffer. */
	if (av_audio_fifo_write(fifo, (void **)converted_input_samples,
	input_frame->nb_samples) < input_frame->nb_samples) {
	printf("Could not write data to FIFO\n");
	return AVERROR_EXIT;
	}
	}
	}
	/**
	* If we have enough samples for the encoder, we encode them.
	* At the end of the file, we pass the remaining samples to
	* the encoder.
	*/
	if (av_audio_fifo_size(fifo) >= output_frame_size)
	/**
	* Take one frame worth of audio samples from the FIFO buffer,
	* encode it and write it to the output file.
	*/
	{
	/** Temporary storage of the output samples of the frame written to the file. */
	AVFrame *output_frame=av_frame_alloc();
	if (!output_frame)
	{
	ret = AVERROR(ENOMEM);
	return ret;
	}
	/**
	* Use the maximum number of possible samples per frame.
	* If there is less than the maximum possible frame size in the FIFO
	* buffer use this number. Otherwise, use the maximum possible frame size
	*/
	const int frame_size = FFMIN(av_audio_fifo_size(fifo),
	pCodecCtx_a->frame_size);
	/** Initialize temporary storage for one output frame. */
	/**
	* Set the frame's parameters, especially its size and format.
	* av_frame_get_buffer needs this to allocate memory for the
	* audio samples of the frame.
	* Default channel layouts based on the number of channels
	* are assumed for simplicity.
	*/
	output_frame->nb_samples = frame_size;
	output_frame->channel_layout = pCodecCtx_a->channel_layout;
	output_frame->format = pCodecCtx_a->sample_fmt;
	output_frame->sample_rate = pCodecCtx_a->sample_rate;
	/**
	* Allocate the samples of the created frame. This call will make
	* sure that the audio frame can hold as many samples as specified.
	*/
	if ((ret = av_frame_get_buffer(output_frame, 0)) < 0) {
	printf("Could not allocate output frame samples\n");
	av_frame_free(&output_frame);
	return ret;
	}
	/**
	* Read as many samples from the FIFO buffer as required to fill the frame.
	* The samples are stored in the frame temporarily.
	*/
	if (av_audio_fifo_read(fifo, (void **)output_frame->data, frame_size) < frame_size) {
	printf("Could not read data from FIFO\n");
	return AVERROR_EXIT;
	}
	/** Encode one frame worth of audio samples. */
	/** Packet used for temporary storage. */
	AVPacket output_packet;
	av_init_packet(&output_packet);
	output_packet.data = NULL;
	output_packet.size = 0;
	/** Set a timestamp based on the sample rate for the container. */
	if (output_frame) {
	nb_samples += output_frame->nb_samples;
	}
	/**
	* Encode the audio frame and store it in the temporary packet.
	* The output audio stream encoder is used to do this.
	*/
	if ((ret = avcodec_encode_audio2(pCodecCtx_a, &output_packet,
	output_frame, &enc_got_frame_a)) < 0) {
	printf("Could not encode frame\n");
	av_packet_unref(&output_packet);
	return ret;
	}
	/** Write one audio frame from the temporary packet to the output file. */
	if (enc_got_frame_a) {
	output_packet.stream_index = 1;
	AVRational time_base = ofmt_ctx->streams[1]->time_base;
	AVRational r_framerate1 = { ifmt_ctx_a->streams[audioindex]->codec->sample_rate, 1 };// { 44100, 1};
	int64_t calc_duration = (double)(AV_TIME_BASE)*(1 / av_q2d(r_framerate1)); //内部时间戳
	output_packet.pts = av_rescale_q(nb_samples*calc_duration, time_base_q, time_base);
	output_packet.dts = output_packet.pts;
	output_packet.duration = output_frame->nb_samples;
	//printf("audio pts : %d\n", output_packet.pts);