V4L2采集YUYV数据x264编码成H264视频

通过V4L2采集YUYV（YUV422）数据，然后使用x264编码库将数据编码成H264视频。详细内容请见博客 http://blog.csdn.net/li_wen01/article/details/56282443

/*=============================================================================
#     FileName: h264encoder.c
#         Desc: this program aim to get image from USB camera
#               used the V4L2 interface.
#       Author: licaibiao
#      Version: 
#   LastChange: 2017-02-21 
=============================================================================*/
#include 
#include 
#include 
#include “./include/h264encoder.h“

int WIDTH = 640;
int HEIGHT = 480;

void compress_begin（Encoder *en int width int height） {
	en->param = （x264_param_t *） malloc（sizeof（x264_param_t））;
	en->picture = （x264_picture_t *） malloc（sizeof（x264_picture_t））;
	x264_param_default（en->param）; //set default param
	//en->param->rc.i_rc_method = X264_RC_CQP;
	// en->param->i_log_level = X264_LOG_NONE;

	en->param->i_threads  = X264_SYNC_LOOKAHEAD_AUTO;
	en->param->i_width = width; //set frame width
	en->param->i_height = height; //set frame height
	WIDTH = width;
	HEIGHT = height;

	//en->param->i_frame_total = 0;

	//en->param->i_keyint_max = 10;
	en->param->rc.i_lookahead = 0; 
	//en->param->i_bframe = 5; 

	//en->param->b_open_gop = 0;
	//en->param->i_bframe_pyramid = 0;
	//en->param->i_bframe_adaptive = X264_B_ADAPT_TRELLIS;

	//en->param->rc.i_bitrate = 1024 * 10;//rate 10 kbps
	en->param->i_fps_num = 30; 
	en->param->i_fps_den = 1;
	en->param->i_csp = X264_CSP_I422;

	x264_param_apply_profile（en->param x264_profile_names[4]）; 

	if （（en->handle = x264_encoder_open（en->param）） == 0） {
		return;
	}
	/* Create a new pic */
	x264_picture_alloc（en->picture X264_CSP_I422 en->param->i_width
			en->param->i_height）;
}

int compress_frame（Encoder *en int type uint8_t *in uint8_t *out） {
	x264_picture_t pic_out;
	int index_y index_u index_v;
	int num;
	int nNal = -1;
	int result = 0;
	int i = 0;
	static long int pts = 0;
	uint8_t *p_out = out;
	char *y = en->picture->img.plane[0];   
	char *u = en->picture->img.plane[1];   
	char *v = en->picture->img.plane[2];   
	char * ptr;

	index_y = 0;
        index_u = 0;
        index_v = 0;

        num = WIDTH * HEIGHT * 2 - 4  ;

        for（i=0; i        {
                *（y + （index_y++）） = *（in + i）;
                *（u + （index_u++）） = *（in + i + 1）;
                *（y + （index_y++）） = *（in + i + 2）;
                *（v + （index_v++）） = *（in + i + 3）;
        }

	switch （type） {
	case 0:
		en->picture->i_type = X264_TYPE_P;
		break;
	case 1:
		en->picture->i_type = X264_TYPE_IDR;
		break;
	case 2:
		en->picture->i_type = X264_TYPE_I;
		break;
	default:
		en->picture->i_type = X264_TYPE_AUTO;
		break;
	}

	en->picture->i_pts = pts++;

	if （x264_encoder_encode（en->handle &（en->nal） &nNal en->picture
			&pic_out） < 0） {
		return -1;
	}

	for （i = 0; i < nNal; i++） {
		memcpy（p_out en->nal[i].p_payload en->nal[i].i_payload）;   
		p_out += en->nal[i].i_payload;								 
		result += en->nal[i].i_payload;
	}

	return result;
}

void compress_end（Encoder *en） {
	if （en->han