使用libx264將I420編碼為H 264

libx264是乙個自由的h.264編碼庫，是x264專案的一部分，使用廣泛，ffmpeg的h.264實現就是用的libx264。

標頭檔案

1 #include 2 #include 3 #include 4 #include 5 #include 6 #include

變數宣告和引數

1

int width = 480;2
int height = 360;3
int fps = 25
;4 size_t yuv_size = width * height * 3 / 2
;5 x264_t *encoder;
6x264_picture_t pic_in, pic_out;
7int
inf, outf;
8 uint8_t *yuv_buffer;910
if (argc != 3
)

encoder就是編碼器，x264_t格式在x264.h檔案中只有

typedef struct x264_t x264_t

每次編碼時，yuv的資訊都儲存在pic_in中

輸入輸出的檔案描述符

從檔案讀入的yuv的緩衝區

初始化encoder

1

x264_param_t param;
2 x264_param_default_preset(¶m, "
veryfast
", "
zerolatency");
3 param.i_threads = 1
;4 param.i_width =width;
5 param.i_height =height;
6 param.i_fps_num =fps;
7 param.i_fps_den = 1;8
9 param.i_keyint_max = 25
;10 param.b_intra_refresh = 1;11
12 param.b_annexb = 1;13
baseline");
15 encoder = x264_encoder_open(¶m);
初始化pic_in

x264_picture_alloc(&pic_in, x264_csp_i420, width, height);

23 yuv_buffer =malloc(yuv_size);
45 pic_in.img.plane[0] =yuv_buffer;
6 pic_in.img.plane[1] = pic_in.img.plane[0] + width *height;
7 pic_in.img.plane[2] = pic_in.img.plane[1] + width * height / 4;

初始化檔案描述符

1 inf = open(argv[1

], o_rdonly);
2if (inf < 0
) 5 outf = open(argv[2], o_creat | o_wronly, 444);6
if (outf < 0
) 編碼
int64_t i_pts = 0;2
3 x264_nal_t *nals;
4int
nnal;
5while (read(inf, yuv_buffer, yuv_size) > 0
) 12 }

掃尾

x264_encoder_close(encoder);

2close(inf);
3close(outf);
4free(yuv_buffer);
5return
0;gcc sourcefile -lx264 -wall -o execfile

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