android平台采用ffmepg生成MP4文件的截图
来源：互联网 发布：网络语画风的意思 编辑：程序博客网 时间：2024/06/05 14:18
1. 编译ffmepg的库文件：
./configure --prefix=/home/linux/study/03.ffmpeg/arm-reduce-out --enable-static --disable-shared --enable-pthreads --enable-cross-compile --cross-prefix=arm-linux-androideabi- --cc=arm-linux-androideabi-gcc --arch=arm --target-os=linux --optflags=-O0 --disable-programs --disable-encoders --enable-encoder=mjpeg --disable-protocols --enable-protocol=file --disable-muxers --enable-muxer=mjpeg --disable-demuxers --enable-demuxer=mov --disable-outdevs --disable-indevs --enable-neon --extra-cflags="-DANDROID -mfloat-abi=softfp -mfpu=neon" --enable-asm --disable-yasm --disable-decoder=aac --disable-decoder=aac_latm
采用的ffmepg版本为3.3.2，采用neon方式编译ffmepg，在arm平台的cpu会有一套单独的指令集优化速度，相比起未采用neon方式的库，速度能快大约三倍。
2. 使用ffmepg解析mp4文件，解析到yuv时，再将yuv图片转化为jpeg图片保存。
代码：
#include <stdio.h>#include <stdlib.h>#include <string.h>#include <unistd.h>#include "libavutil/log.h"#include "libavcodec/avcodec.h"#include "libavformat/avformat.h"#include "libswscale/swscale.h"#include "libavutil/imgutils.h"#define FREE_MEM(a) if(a){free(a);a=NULL;}#define LOGE(format, ...) printf("[ERROR][%s:%d] "format, __FILE__, __LINE__, ## __VA_ARGS__)#define LOGW(format, ...) printf("[WARNING][%s:%d] "format, __FILE__, __LINE__, ## __VA_ARGS__)#define LOGI(format, ...) printf("[INFO][%s:%d] "format, __FILE__, __LINE__, ## __VA_ARGS__)typedef struct { AVFormatContext *pFormatCtx; AVCodecContext *pCodecCtx; AVCodec *pCodec; AVFrame *pFrame; AVFrame *pFrameYUV; uint8_t *out_buffer; AVPacket *packet; struct SwsContext *img_convert_ctx; char *mp4_path; int videoindex; int frame_cnt; clock_t time_start; clock_t time_finish;}MP4_DECODE_TAG;MP4_DECODE_TAG * init_decode_tag(char * mp4_file);void decode_tag(MP4_DECODE_TAG * context);void uninit_decode_tag(MP4_DECODE_TAG * context);int decode(char * input_jstr, char * output_jstr);int yuv_to_jpeg(const char * out_file, const unsigned char * yuv_data, int width, int height);int main(int argc, char * argv[]){ //decode("/data/temp/duan.mp4", "dota2_output_yuv.yuv"); MP4_DECODE_TAG * context = NULL; context = init_decode_tag("/data/temp/dota2.mp4"); decode_tag(context); uninit_decode_tag(context); return 0;}MP4_DECODE_TAG * init_decode_tag(char * mp4_file){ int i = -1; MP4_DECODE_TAG * context = NULL; if(NULL == mp4_file) { LOGE("mp4_file is NULL\n"); return context; } context = (MP4_DECODE_TAG *)malloc(sizeof(MP4_DECODE_TAG)); if(NULL == context) { LOGE("malloc error: %s\n", strerror(errno)); return context; } memset(context, 0, sizeof(MP4_DECODE_TAG)); context->pFormatCtx = NULL; context->pCodecCtx = NULL; context->pCodec = NULL; context->pFrame = NULL; context->pFrameYUV = NULL; context->out_buffer = NULL; context->packet = NULL; context->img_convert_ctx = NULL; context->mp4_path = NULL; context->mp4_path = strdup(mp4_file); context->videoindex = -1; context->frame_cnt = 0; av_register_all(); avformat_network_init(); context->pFormatCtx = avformat_alloc_context(); if(avformat_open_input(&(context->pFormatCtx), context->mp4_path, NULL, NULL) != 0) { LOGE("Couldn't open input stream.\n"); uninit_decode_tag(context); } if(avformat_find_stream_info(context->pFormatCtx, NULL) < 0) { LOGE("Couldn't find stream information.\n"); uninit_decode_tag(context); } for(i = 0; i < context->pFormatCtx->nb_streams; i++) { if(context->pFormatCtx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) { context->videoindex = i; break; } } if(context->videoindex == -1) { LOGE("Couldn't find a video stream.\n"); uninit_decode_tag(context); } context->pCodecCtx = context->pFormatCtx->streams[context->videoindex]->codec; context->pCodec = avcodec_find_decoder(context->pCodecCtx->codec_id); if(context->pCodec == NULL) { LOGE("Couldn't find Codec.\n"); uninit_decode_tag(context); } if(avcodec_open2(context->pCodecCtx, context->pCodec, NULL) < 0) { LOGE("Couldn't open codec.\n"); uninit_decode_tag(context); } context->pFrame = av_frame_alloc(); context->pFrameYUV = av_frame_alloc(); context->out_buffer = (unsigned char *)av_malloc(av_image_get_buffer_size(AV_PIX_FMT_YUV420P, context->pCodecCtx->width, context->pCodecCtx->height, 1)); av_image_fill_arrays(context->pFrameYUV->data, context->pFrameYUV->linesize, context->out_buffer, AV_PIX_FMT_YUV420P, context->pCodecCtx->width, context->pCodecCtx->height, 1); context->packet = (AVPacket *)av_malloc(sizeof(AVPacket)); context->img_convert_ctx = sws_getContext(context->pCodecCtx->width, context->pCodecCtx->height, context->pCodecCtx->pix_fmt, context->pCodecCtx->width, context->pCodecCtx->height, AV_PIX_FMT_YUV420P, SWS_BICUBIC, NULL, NULL, NULL); LOGI("[Input ]%s\n", context->mp4_path); LOGI("[Format ]%s\n", context->pFormatCtx->iformat->name); LOGI("[Codec ]%s\n", context->pCodecCtx->codec->name); LOGI("[Resolution]%dx%d\n", context->pCodecCtx->width, context->pCodecCtx->height); LOGI("init gl show!\n"); return context;}void decode_tag(MP4_DECODE_TAG * context){ int scale_jpg_cnt = 0; int ret = -1; int y_size; int got_picture = -1; FILE *fp_yuv = NULL; unsigned char * frame_yuv = NULL; if(NULL == context) { return; } fp_yuv = fopen("/data/temp/test.yuv", "wb+"); if(fp_yuv == NULL) { LOGE("Cannot open output file.\n"); return; } context->time_start = clock(); while(av_read_frame(context->pFormatCtx, context->packet) >= 0) { if(context->packet->stream_index == context->videoindex) { ret = avcodec_decode_video2(context->pCodecCtx, context->pFrame, &got_picture, context->packet); if(ret < 0) { LOGE("Decode Error.\n"); return -1; } if(got_picture) { sws_scale(context->img_convert_ctx, (const uint8_t* const*)context->pFrame->data, context->pFrame->linesize, 0, context->pCodecCtx->height, context->pFrameYUV->data, context->pFrameYUV->linesize); y_size = context->pCodecCtx->width * context->pCodecCtx->height; frame_yuv = (unsigned char *)malloc(y_size *3 / 2); memset(frame_yuv, 0, y_size *3 / 2); //snprintf(frame_yuv, y_size *3 / 2, "%s%s%s", context->pFrameYUV->data[0], context->pFrameYUV->data[1], context->pFrameYUV->data[2]); memcpy(frame_yuv, context->pFrameYUV->data[0], y_size); memcpy(frame_yuv + y_size, context->pFrameYUV->data[1], y_size / 4); memcpy(frame_yuv + y_size * 5 / 4, context->pFrameYUV->data[2], y_size / 4); //fwrite(frame_yuv, 1, y_size * 3 / 2, fp_yuv); if(++scale_jpg_cnt % 100 == 0) { char jpg_name[32]; snprintf(jpg_name, 32 - 1, "scale_%d.jpeg", scale_jpg_cnt); yuv_to_jpeg(jpg_name, frame_yuv, context->pCodecCtx->width, context->pCodecCtx->height); } //fwrite(context->pFrameYUV->data[0], 1, y_size, fp_yuv); //Y //fwrite(context->pFrameYUV->data[1], 1, y_size / 4, fp_yuv); //U //fwrite(context->pFrameYUV->data[2], 1, y_size / 4, fp_yuv); //V //Output info char pictype_str[10] = {0}; switch(context->pFrame->pict_type) { case AV_PICTURE_TYPE_I:sprintf(pictype_str, "I"); break; case AV_PICTURE_TYPE_P:sprintf(pictype_str, "P"); break; case AV_PICTURE_TYPE_B:sprintf(pictype_str, "B"); break; default:sprintf(pictype_str, "Other"); break; } FREE_MEM(frame_yuv); LOGI("Frame Index: %d. Type:%s\n", context->frame_cnt, pictype_str); context->frame_cnt++; } } av_free_packet(context->packet); } //flush decoder //FIX: Flush Frames remained in Codec while (1) { ret = avcodec_decode_video2(context->pCodecCtx, context->pFrame, &got_picture, context->packet); if (ret < 0) break; if (!got_picture) break; sws_scale(context->img_convert_ctx, (const uint8_t* const*)context->pFrame->data, context->pFrame->linesize, 0, context->pCodecCtx->height, context->pFrameYUV->data, context->pFrameYUV->linesize); int y_size = context->pCodecCtx->width * context->pCodecCtx->height; fwrite(context->pFrameYUV->data[0], 1, y_size, fp_yuv); //Y fwrite(context->pFrameYUV->data[1], 1, y_size / 4, fp_yuv); //U fwrite(context->pFrameYUV->data[2], 1, y_size / 4, fp_yuv); //V //Output info char pictype_str[10] = {0}; switch(context->pFrame->pict_type) { case AV_PICTURE_TYPE_I:sprintf(pictype_str, "I"); break; case AV_PICTURE_TYPE_P:sprintf(pictype_str, "P"); break; case AV_PICTURE_TYPE_B:sprintf(pictype_str, "B"); break; default:sprintf(pictype_str, "Other"); break; } LOGI("Frame Index: %5d. Type:%s\n", context->frame_cnt, pictype_str); context->frame_cnt++; } if(NULL != fp_yuv) { fclose(fp_yuv); fp_yuv = NULL; }}void uninit_decode_tag(MP4_DECODE_TAG * context){ double time_duration = 0.0; if(NULL == context) { return; } context->time_finish = clock(); time_duration = (double)(context->time_finish - context->time_start); LOGI("[Time ]%fms\n", time_duration); LOGI("[Count ]%d\n", context->frame_cnt); FREE_MEM(context->mp4_path); if(NULL != context->img_convert_ctx) { sws_freeContext(context->img_convert_ctx); } if(NULL != context->pFrameYUV) { av_frame_free(&(context->pFrameYUV)); } if(NULL != context->pFrame) { av_frame_free(&(context->pFrame)); } if(NULL != context->pCodecCtx) { avcodec_close(context->pCodecCtx); } if(NULL != context->pFormatCtx) { avformat_close_input(&(context->pFormatCtx)); } FREE_MEM(context);}int yuv_to_jpeg(const char * out_file, const unsigned char * yuv_data, int width, int height){ AVFormatContext* pFormatCtx = NULL; AVOutputFormat* fmt = NULL; AVStream* video_st = NULL; AVCodecContext* pCodecCtx = NULL; AVCodec* pCodec = NULL; uint8_t* picture_buf = NULL; AVFrame* picture = NULL; AVPacket pkt; int y_size; int got_picture = 0; int size; int ret = -1; int rv = -1; //YUV source int in_w = width, in_h = height; //YUV's width and height //const char* out_file = "cuc_view_encode.jpg"; //Output file av_register_all(); //Method 1 pFormatCtx = avformat_alloc_context(); //Guess format fmt = av_guess_format("mjpeg", NULL, NULL); pFormatCtx->oformat = fmt; //Output URL if (avio_open(&pFormatCtx->pb, out_file, AVIO_FLAG_READ_WRITE) < 0) { printf("Couldn't open output file(%s), error: %d\n", out_file, strerror(errno)); goto MAIN_EXIT; } //Method 2. More simple //avformat_alloc_output_context2(&pFormatCtx, NULL, NULL, out_file); //fmt = pFormatCtx->oformat; video_st = avformat_new_stream(pFormatCtx, 0); if (video_st == NULL) { goto MAIN_EXIT; } pCodecCtx = video_st->codec; pCodecCtx->codec_id = fmt->video_codec; pCodecCtx->codec_type = AVMEDIA_TYPE_VIDEO; pCodecCtx->pix_fmt = AV_PIX_FMT_YUVJ420P; pCodecCtx->width = in_w; pCodecCtx->height = in_h; pCodecCtx->time_base.num = 1; pCodecCtx->time_base.den = 25; //Output some information av_dump_format(pFormatCtx, 0, out_file, 1); pCodec = avcodec_find_encoder(pCodecCtx->codec_id); if (!pCodec) { printf("Codec not found."); goto MAIN_EXIT; } if (avcodec_open2(pCodecCtx, pCodec, NULL) < 0) { printf("Could not open codec."); goto MAIN_EXIT; } picture = av_frame_alloc(); size = avpicture_get_size(pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height); picture_buf = (uint8_t *)av_malloc(size); if (!picture_buf) { goto MAIN_EXIT; } avpicture_fill((AVPicture *)picture, picture_buf, pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height); //Write Header avformat_write_header(pFormatCtx, NULL); y_size = pCodecCtx->width * pCodecCtx->height; av_new_packet(&pkt, y_size * 3); //Read YUV memcpy(picture_buf, yuv_data, y_size * 3 / 2); //if (fread(picture_buf, 1, y_size * 3 / 2, in_file) <= 0) //{ //printf("Could not read input file."); //av_free_packet(&pkt); //goto MAIN_EXIT; //} picture->data[0] = picture_buf; // Y picture->data[1] = picture_buf+ y_size; // U picture->data[2] = picture_buf+ y_size*5/4; // V //Encode ret = avcodec_encode_video2(pCodecCtx, &pkt,picture, &got_picture); if(ret < 0) { printf("Encode Error.\n"); av_free_packet(&pkt); goto MAIN_EXIT; } if (got_picture == 1) { pkt.stream_index = video_st->index; ret = av_write_frame(pFormatCtx, &pkt); } av_free_packet(&pkt); //Write Trailer av_write_trailer(pFormatCtx); printf("Encode Successful.\n"); rv = 0; MAIN_EXIT: if (NULL != video_st) { avcodec_close(video_st->codec); if(NULL != picture) { av_free(picture); picture = NULL; } if(NULL != picture_buf) { av_free(picture_buf); picture_buf = NULL; } } if(NULL != pCodecCtx) { avcodec_close(pCodecCtx); } if(NULL != pFormatCtx) { avio_close(pFormatCtx->pb); avformat_free_context(pFormatCtx); pFormatCtx = NULL; } return rv ;}阅读全文
0 0
- android平台采用ffmepg生成MP4文件的截图
- ffmepg移动moov box到MP4文件开始处
- 如何生成mp4文件
- Android中如何提取和生成mp4文件
- Android中如何提取和生成mp4文件
- Android中如何提取和生成mp4文件
- Android中如何提取和生成mp4文件（MediaMUxer）
- android 获取MP4文件的图片大小
- 视频安防平台-MP4文件的封装
- Android平台截图
- 运用ffmpeg生成MP4文件
- 运用ffmpeg生成MP4文件
- 运用ffmpeg生成MP4文件
- 运用ffmpeg生成MP4文件
- 运用ffmpeg生成MP4文件
- 运用ffmpeg生成MP4文件
- Android 播放MP4文件
- 对上传的flv,mp4截图
- 使用FormData对象提交表单及上传图片
- Spring 配置多个数据源，并实现动态切换
- php 文件上传(无数据库版)
- 前后端数据交互之通过JS实现将得到的数组通过Ajax传递到后端
- 全局变量和局部变量在内存里的区别？堆和栈
- android平台采用ffmepg生成MP4文件的截图
- java float 详解
- cannot change DocValues type from SORTED_SET to NUMERIC for field xxx
- BOOST库shared_ptr在标准容器中的应用
- 滑动效果是如何产生的
- cloudear manager hue & oozie的timezone修复方式
- 音乐播放
- 淘宝京东专题页做法之HTML5 map 应用（2）
- nginx学习（操作和实现）
