How ffmpeg calls NDK camera - ffmpeg

Question

There is an android_camera.c file in the ffmpeg project. I want to call NDK camera through ffmpeg, take out YUV data, and write it to the file. Currently, the code has been blocking the function wait_for_image_format.
android_camera.c
#include <stdio.h>
#include <math.h>
#include <libavutil/opt.h>
#include <libavcodec/avcodec.h>
#include <libavutil/channel_layout.h>
#include <libavutil/common.h>
#include <libavutil/imgutils.h>
#include <libavutil/mathematics.h>
#include <libavutil/samplefmt.h>
#include <libavformat/avformat.h>
#include <libavdevice/avdevice.h>
#include <libavutil/dict.h>
int main(int argc, char **argv) {
int ret;
AVFormatContext *fmtCtx = NULL;
AVPacket pkt1, *pcaket = &pkt1;
/*1、注册*/
avcodec_register_all();
avdevice_register_all();
/*2、连接视频源*/
AVInputFormat *inputFmt = av_find_input_format("android_camera");
if (NULL != inputFmt) {
printf("input device name:%s\n",inputFmt->name);
} else {
printf("Null point!\n");
}
#if 1
AVDictionary *avdict = NULL;
AVDictionaryEntry *t = av_dict_get(avdict, "video_size", NULL, AV_DICT_IGNORE_SUFFIX);
printf("ok1\n");
av_dict_set(&avdict, "video_size", "hd720", 0);
av_dict_set_int(&avdict, "camera_index",1, 0);
av_dict_set_int(&avdict, "input_queue_size",2, 0);
printf("ok2\n");
/*3、打开视频采集设备*/
//ret = avformat_open_input(&fmtCtx, "video=/dev/video1", inputFmt, avdict);
//ret = avformat_open_input(&fmtCtx, "android_camera", inputFmt, avdict);
fmtCtx = avformat_alloc_context();
if (NULL == fmtCtx) {
printf("Open input device seccess!\n");
}
printf("ok3\n");
//if (avformat_find_stream_info(fmtCtx, NULL) < 0) {
// printf("Could not find stream information\n");
//}
//printf("ok4\n");
ret = avformat_open_input(&fmtCtx, NULL, inputFmt, &avdict);
printf("ok4\n");
av_dict_free(&avdict);
#else
fmtCtx = avformat_alloc_context();
if(!fmtCtx)
{
printf("avformat_alloc_contest error\n");
exit(1);
}
#endif
printf("ok5\n");
//ret = av_demuxer_open(fmtCtx);
if(ret<0)
{
printf("av_demuxer_open error\n");
}
printf("ok6\n");
/*4、读取一帧数据，编码依据摄像头类型而定，我使用的摄像头输出的是yuv422格式*/
fmtCtx->flags &= (~0x4);
av_read_frame(fmtCtx, pcaket);
printf("ok7\n");
//printf("packet size:%d\n",(pcaket->size));
/*5、写入帧数据到文件*/
FILE *fp = NULL;
fp = fopen("out.yuv", "a+");
if (NULL != fp) {
//将数据写入文件
fwrite(pcaket->data, 1, pcaket->size, fp);
}
//关闭文件
fclose(fp);
/*6、释放读取的帧数据*/
av_free_packet(pcaket);
/*7、关闭视频输入源*/
avformat_close_input(&fmtCtx);
return 0;
}