x264直接编码

xiaoxiao2021-02-28 143

http://blog.csdn.net/subfate/article/details/48437693

目录(?)[+]

x264是一个开源的H.264编码库。本文介绍其在x86 Linux的编译方法，并给出实例。

一、编译

x264编译需要使用到yasm，到http://www.tortall.net/projects/yasm/releases/下载，最新版本为1.3.1。编译命令如下：

# ./configure;make;make install

x264官方下载：http://www.videolan.org/developers/x264.html。下载压缩包名为：last_x264.tar.bz2。解压得到的文件名为x264-snapshot-xxxx。编译命令如下：

$ ./configure --prefix=/home/latelee/bin/x264 --enable-static $ make $ make install

二、实例

下面给出使用的示例。

[cpp] view plain copy /** x264库编码要使用以下库 -lpthread -ldl 要求头文件：stdint.h ffprobe信息： Input #0, h264, from 'test.h264': Duration: N/A, bitrate: N/A Stream #0:0: Video: h264 (High), yuv420p, 176x144, 25 fps, 25 tbr, 1200k tbn , 50 tbc */ #include <stdio.h> #include <stdlib.h> #include <stdint.h> // for uint8_t in x264.h #include "x264.h" int x264_encode(const char* infile, int width, int height, int type, const char* outfile) { FILE *fp_src = NULL; FILE *fp_dst = NULL; unsigned int luma_size = 0; unsigned int chroma_size = 0; int i_nal = 0; int i_frame = 0; unsigned int i_frame_size = 0; int csp = type;//X264_CSP_I420; x264_nal_t* nal = NULL; x264_t* handle = NULL; x264_picture_t* pic_in = NULL; x264_picture_t* pic_out = NULL; x264_param_t param; fp_src = fopen(infile, "rb"); fp_dst = fopen(outfile, "wb"); if(fp_src==NULL || fp_dst==NULL) { perror("Error open yuv files:"); return -1; } x264_param_default(¶m); param.i_width = width; param.i_height = height; /* //Param param.i_log_level = X264_LOG_DEBUG; param.i_threads = X264_SYNC_LOOKAHEAD_AUTO; param.i_frame_total = 0; param.i_keyint_max = 10; param.i_bframe = 5; param.b_open_gop = 0; param.i_bframe_pyramid = 0; param.rc.i_qp_constant=0; param.rc.i_qp_max=0; param.rc.i_qp_min=0; param.i_bframe_adaptive = X264_B_ADAPT_TRELLIS; param.i_fps_den = 1; param.i_fps_num = 25; param.i_timebase_den = param.i_fps_num; param.i_timebase_num = param.i_fps_den; */ param.i_csp = csp; param.b_repeat_headers = 1; param.b_annexb = 1; // profile: high x264_profile_names定义见x264.h x264_param_apply_profile(¶m, x264_profile_names[2]); pic_in = (x264_picture_t*)malloc(sizeof(x264_picture_t)); if (pic_in == NULL) { goto out; } pic_out = (x264_picture_t*)malloc(sizeof(x264_picture_t)); if (pic_out == NULL) { goto out; } x264_picture_init(pic_out); x264_picture_alloc(pic_in, csp, param.i_width, param.i_height); handle = x264_encoder_open(¶m); // 计算有多少帧 luma_size = param.i_width * param.i_height; fseek(fp_src, 0, SEEK_END); switch (csp) { case X264_CSP_I444: i_frame = ftell(fp_src) / (luma_size*3); chroma_size = luma_size; break; case X264_CSP_I420: i_frame = ftell(fp_src) / (luma_size*3/2); chroma_size = luma_size / 4; break; default: printf("Colorspace Not Support.\n"); goto out; } fseek(fp_src, 0, SEEK_SET); printf("framecnt: %d, y: %d u: %d\n", i_frame, luma_size, chroma_size); // 编码 for (int i = 0; i < i_frame; i++) { switch(csp) { case X264_CSP_I444: case X264_CSP_I420: i_frame_size = fread(pic_in->img.plane[0], 1, luma_size, fp_src); if (i_frame_size != luma_size) { printf("read luma failed %d.\n", i_frame_size); break; } i_frame_size = fread(pic_in->img.plane[1], 1, chroma_size, fp_src); if (i_frame_size != chroma_size) { printf("read chroma1 failed %d.\n", i_frame_size); break; } i_frame_size = fread(pic_in->img.plane[2], 1, chroma_size, fp_src); if (i_frame_size != chroma_size) { printf("read chrome2 failed %d.\n", i_frame_size); break; } break; default: printf("Colorspace Not Support.\n"); return -1; } pic_in->i_pts = i; i_frame_size = x264_encoder_encode(handle, &nal, &i_nal, pic_in, pic_out); printf("encode frame: ] framesize: %d nal: %d\n", i+1, i_frame_size, i_nal); if (i_frame_size < 0) { printf("Error encode frame: %d.\n", i+1); goto out; } #if 01 else if (i_frame_size) { if(!fwrite(nal->p_payload, 1, i_frame_size, fp_dst)) goto out; } #endif // 另一种做法 #if 0 // i_nal有可能为0，有可能多于1 for (int j = 0; j < i_nal; j++) { fwrite(nal[j].p_payload, 1, nal[j].i_payload, fp_dst); } #endif } //flush encoder while(x264_encoder_delayed_frames(handle)) //while(1) { static int cnt = 1; i_frame_size = x264_encoder_encode(handle, &nal, &i_nal, NULL, pic_out); printf("flush frame: %d framesize: %d nalsize: %d\n", cnt++, i_frame_size, i_nal); if(i_frame_size == 0) { break; //goto out; } #if 01 else if(i_frame_size) { if(!fwrite(nal->p_payload, 1, i_frame_size, fp_dst)) goto out; } #endif // 另一种做法 #if 0 // i_nal有可能为0，有可能多于1 for (int j = 0; j < i_nal; j++) { fwrite(nal[j].p_payload, 1, nal[j].i_payload, fp_dst); } #endif } out: x264_picture_clean(pic_in); if (handle) { x264_encoder_close(handle); handle = NULL; } if (pic_in) free(pic_in); if (pic_out) free(pic_out); fclose(fp_src); fclose(fp_dst); return 0; }

使用方法：

[cpp] view plain copy x264_encode("../src/suzie_qcif_176x144_yuv420p.yuv", 176, 144, 1, "test.h264");

Makefile如下：

[cpp] view plain copy # # (C) Copyleft 2011~2015 # Late Lee from http://www.latelee.org # # A simple Makefile for *ONE* project(c or/and cpp file) in *ONE* directory # # note: # you can put head file(s) in 'include' directory, so it looks # a little neat. # # usage: $ make # $ make debug=y # # log # 2013-05-14 sth about debug... ############################################################################### # !!!=== cross compile... CROSS_COMPILE = CC = $(CROSS_COMPILE)gcc CXX = $(CROSS_COMPILE)g++ AR = $(CROSS_COMPILE)ar ARFLAGS = cr RM = -rm -rf MAKE = make CFLAGS := -Wall #**************************************************************************** # debug can be set to y to include debugging info, or n otherwise debug := n #**************************************************************************** ifeq ($(debug), y) CFLAGS += -ggdb -rdynamic else CFLAGS += -O2 -s endif # !!!=== DEFS = CFLAGS += $(DEFS) LDFLAGS := $(LIBS) # !!!=== INCDIRS := -I./include # !!!=== CFLAGS += $(INCDIRS) # !!!=== LDFLAGS += ./lib/libx264.a ./lib/libx265.a -lpthread -ldl # !!!=== # source file(s), including c file(s) cpp file(s) # you can also use $(wildcard *.c), etc. SRC_C := $(wildcard *.c) SRC_CPP := $(wildcard *.cpp) # object file(s) OBJ_C := $(patsubst %.c,%.o,$(SRC_C)) OBJ_CPP := $(patsubst %.cpp,%.o,$(SRC_CPP)) # !!!=== # executable file target = a.out ############################################################################### all: $(target) $(target): $(OBJ_C) $(OBJ_CPP) @echo "Generating executable file..." $(notdir $(target)) @$(CXX) $(CFLAGS) $^ -o $(target) $(LDFLAGS) # make all .c or .cpp %.o: %.c @echo "Compiling: " $(addsuffix .c, $(basename $(notdir $@))) @$(CC) $(CFLAGS) -c $< -o $@ %.o: %.cpp @echo "Compiling: " $(addsuffix .cpp, $(basename $(notdir $@))) @$(CXX) $(CFLAGS) -c $< -o $@ clean: @echo "Cleaning..." @$(RM) $(target) @$(RM) *.o *.back *~ .PHONY: all clean

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