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convert.go
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convert.go
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package main
/*
//user you own clib path and *.h path
#cgo CFLAGS: -I/usr/local/ffmpeg/include
#cgo LDFLAGS:-L/usr/local/ffmpeg/lib -lavcodec -lavformat -lavfilter -lavutil -lavdevice -lswresample
#include "libavfilter/avfilter.h"
#include "libavformat/avformat.h"
#include "libavcodec/avcodec.h"
#include "libavutil/avutil.h"
#include "libavutil/opt.h"
#include "libavdevice/avdevice.h"
#include <stdio.h>
struct Input
{
char *h265_data;
int offset;
int size;
};
struct Output
{
char *jpeg_data;
int offset;
};
//func declear
int saveJpg(AVFrame *pFrame, struct Output *output_data);
//缓存1Mb
const int BUF_SIZE = 1048576;
//读取数据的回调函数-------------------------
//AVIOContext使用的回调函数!
//注意:返回值是读取的字节数
//手动初始化AVIOContext只需要两个东西:内容来源的buffer,和读取这个Buffer到FFmpeg中的函数
//回调函数,功能就是:把buf_size字节数据送入buf即可
//第一个参数(void *opaque)一般情况下可以不用
//call back fun for AVIOContext
//retuen the size of data in real
//send buf_size data to buf
int fill_iobuffer(void *opaque, uint8_t *buf, int buf_size)
{
//从h256_data拷贝到buf中buf_size个字节
//copy buf_size data to buf from h265_data
struct Input *data = (struct Input *)opaque;
// int read_offset = data->offset;
int size = data->size;
char *h265_data = data->h265_data;
if (data->offset + buf_size - 1 < size)
{
//has enough data
memcpy(buf, h265_data + data->offset, buf_size);
data->offset += buf_size;
// printf("callback: read offset: %d\n", read_offset);
return buf_size;
}
else
{
//no data to read
if (data->offset >= size)
{
return -1;
}
else
{
int real_read = size - data->offset;
memcpy(buf, h265_data + data->offset, real_read);
data->offset += buf_size;
// printf("callback: read offset: %d\n", data->offset);
return real_read;
}
}
}
int convert(struct Input *input_data, struct Output *output_data)
{
AVFormatContext *fmtCtx = NULL; // 文件格式管理
const AVCodec *codec; // 定义解码器
AVCodecContext *codeCtx = NULL; // 定义解码器上下文
AVStream *stream = NULL; // 定义视频流
int streamType; // 流类型
AVCodecParameters *originPar = NULL; // 解码器的参数
AVFrame *frame; // 帧
AVPacket avpkt; // 数据包
fmtCtx = avformat_alloc_context();
unsigned char *iobuffer = (unsigned char *)av_malloc(BUF_SIZE);
//init AVIOContext fill_iobuffer is a callback func
AVIOContext *avio = avio_alloc_context(iobuffer, BUF_SIZE, 0, input_data, fill_iobuffer, NULL, NULL);
fmtCtx->pb = avio;
if (avformat_open_input(&fmtCtx, "nothing", NULL, NULL) < 0) // 成功返回0, 错误返回负值, 后两个参数用于指定文件格式
{
printf("Error in open file");
exit(0);
}
if (avformat_find_stream_info(fmtCtx, NULL) < 0)
{
printf("Error in find stream");
exit(0);
}
//av_dump_format(fmt_ctx, 0, inputFile, 0);
av_init_packet(&avpkt);
avpkt.data = NULL;
avpkt.size = 0;
streamType = av_find_best_stream(fmtCtx, AVMEDIA_TYPE_VIDEO, -1, -1, NULL, 0);
if (streamType < 0)
{
printf("Error in find best stream type");
exit(0);
}
//auto find right encoder
originPar = fmtCtx->streams[streamType]->codecpar;
codec = avcodec_find_decoder(originPar->codec_id);
if (!codec)
{
printf("Error in get the codec");
exit(0);
}
codeCtx = avcodec_alloc_context3(codec); // 初始化解码器上下文
if (!codeCtx)
{
printf("Error in allocate the codeCtx");
exit(0);
}
if (avcodec_parameters_to_context(codeCtx, originPar) < 0)
{
printf("Error in replace the parameters int the codeCtx");
exit(0);
}
avcodec_open2(codeCtx, codec, NULL); //打开解码器
frame = av_frame_alloc(); // 初始化帧, 用默认值填充字段
if (!frame)
{
printf("Error in allocate the frame");
exit(0);
}
av_read_frame(fmtCtx, &avpkt); //从文件中读取一个数据包, 存储到avpkt中
if (avpkt.stream_index == streamType)
{ // 读取的数据包类型正确
if (avcodec_send_packet(codeCtx, &avpkt) < 0) // 将数据包发送到解码器中
{
printf("Error in the send packet");
exit(0);
}
while (avcodec_receive_frame(codeCtx, frame) == 0)
{
saveJpg(frame, output_data);
}
}
//free av_packt
av_packet_unref(&avpkt);
}
//your own callback func, to deal with converted data
int write_buffer(void *opaque, uint8_t *buf, int buf_size)
{
struct Output *data = (struct Output *)opaque;
if (buf_size > BUF_SIZE)
{
return -1;
}
memcpy(data->jpeg_data + data->offset, buf, buf_size);
data->offset += buf_size;
return buf_size;
}
int saveJpg(AVFrame *pFrame, struct Output *output_data)
{
int width = pFrame->width;
int height = pFrame->height;
AVCodecContext *pCodeCtx = NULL;
AVFormatContext *pFormatCtx = NULL;
avformat_alloc_output_context2(&pFormatCtx, NULL, "mjpeg", NULL);
//new a AVIOContext and contact with pFormatCtx
//you need give AVIOContext your own call back func, to tell AVIOContext how to write the converted data
unsigned char *outbuffer = (unsigned char *)av_malloc(BUF_SIZE);
AVIOContext *avio_out = avio_alloc_context(outbuffer, BUF_SIZE, 1, output_data, NULL, write_buffer, NULL);
//contact with pFormatCtx
pFormatCtx->pb = avio_out;
pFormatCtx->flags = AVFMT_FLAG_CUSTOM_IO | AVFMT_FLAG_FLUSH_PACKETS;
// new stream
AVStream *pAVStream = avformat_new_stream(pFormatCtx, 0);
if (pAVStream == NULL)
{
return -1;
}
AVCodecParameters *parameters = pAVStream->codecpar;
parameters->codec_id = pFormatCtx->oformat->video_codec;
parameters->codec_type = AVMEDIA_TYPE_VIDEO;
parameters->format = AV_PIX_FMT_YUVJ420P;
parameters->width = pFrame->width;
parameters->height = pFrame->height;
AVCodec *pCodec = avcodec_find_encoder(pAVStream->codecpar->codec_id);
if (!pCodec)
{
printf("Could not find encoder\n");
return -1;
}
pCodeCtx = avcodec_alloc_context3(pCodec);
if (!pCodeCtx)
{
fprintf(stderr, "Could not allocate video codec context\n");
return -1;
}
if ((avcodec_parameters_to_context(pCodeCtx, pAVStream->codecpar)) < 0)
{
fprintf(stderr, "Failed to copy %s codec parameters to decoder context\n",
av_get_media_type_string(AVMEDIA_TYPE_VIDEO));
return -1;
}
pCodeCtx->time_base = (AVRational){1, 25};
if (avcodec_open2(pCodeCtx, pCodec, NULL) < 0)
{
printf("Could not open codec.");
return -1;
}
int ret = avformat_write_header(pFormatCtx, NULL);
if (ret < 0)
{
printf("write_header fail\n");
return -1;
}
int y_size = width * height;
//Encode
//give AVPacket enough space
AVPacket pkt;
av_new_packet(&pkt, y_size * 3);
// send frame
ret = avcodec_send_frame(pCodeCtx, pFrame);
if (ret < 0)
{
printf("Could not avcodec_send_frame.");
return -1;
}
// recv packt
ret = avcodec_receive_packet(pCodeCtx, &pkt);
if (ret < 0)
{
printf("Could not avcodec_receive_packet");
return -1;
}
// printf("av_write_frame\n");
ret = av_write_frame(pFormatCtx, &pkt);
avio_flush(avio_out);
// printf("av_write_frame done\n");
if (ret < 0)
{
printf("Could not av_write_frame");
return -1;
}
// printf("av_packet_unref\n");
av_packet_unref(&pkt);
//Write Trailer
av_write_trailer(pFormatCtx);
// printf("av_write_trailer\n");
if (pFormatCtx->pb)
{
avio_context_free(&pFormatCtx->pb);
}
// printf("avio_free\n");
if (pFormatCtx)
{
avformat_free_context(pFormatCtx);
}
// printf("avformat_free_context\n");
if (pCodeCtx)
{
avcodec_close(pCodeCtx);
}
// printf("avcodec_close\n");
return 0;
}
//返回des
int h265_to_jpeg(char *src, char *des, int input_size)
{
// memcpy(h265_data, src, size);
// // h265_data = src;
// read_true_size = size;
struct Input input_data;
input_data.h265_data = src;
input_data.offset = 0;
input_data.size = input_size;
struct Output output_data;
output_data.jpeg_data = des;
output_data.offset = 0;
int err = 0;
err = convert(&input_data, &output_data);
if (err != 0)
{
return -1;
}
// memcpy(des, jpeg_data, write_offset);
return output_data.offset;
}
*/
import "C"
import (
"errors"
"fmt"
"io/ioutil"
// _ "net/http/pprof"
"os"
"time"
"unsafe"
)
func c_h265_to_jpeg(src []byte, size int) (des []byte, err error) {
des = make([]byte, 1048576)
c_src := (*C.char)(unsafe.Pointer(&src[0])) // 转换
c_int := (*C.int)(unsafe.Pointer(&size))
c_des := (*C.char)(unsafe.Pointer(&des[0])) // 转换
res := C.h265_to_jpeg(c_src, c_des, *c_int)
// fmt.Println(res)
if res < 0 {
err = errors.New("C convert err!")
return
}
des = des[:res]
return
}
func startConvert(src []byte) {
des, err := c_h265_to_jpeg(src, len(src))
if err != nil {
return
}
//write files
WriteWithIoutil("./bin/testGo.jpeg", des)
}
func main() {
//read resource
inputFile := "resource/test.h265"
src, err := ReadAll(inputFile)
if err != nil || len(src) == 0 {
fmt.Println(err.Error())
fmt.Println("read file err")
return
}
// fmt.Println("read file len: ", len(src))
fmt.Println("start convert")
start := time.Now().UnixNano()
startConvert(src)
end := time.Now().UnixNano()
fmt.Printf("cost time is %d ms\n", (end-start)/1e6)
// select {}
}
//read file
func ReadAll(filePth string) ([]byte, error) {
f, err := os.Open(filePth)
defer f.Close()
if err != nil {
return nil, err
}
return ioutil.ReadAll(f)
}
//weite file
func WriteWithIoutil(filePath string, content []byte) error {
if err := ioutil.WriteFile(filePath, content, 0644); err == nil {
fmt.Println("write file success")
} else {
fmt.Println(err.Error())
}
return nil
}