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yuvtool_lib.cpp
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yuvtool_lib.cpp
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// YuvTool.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
/**
* @file
* libswscale API use example.
* @example scaling_video.c
*/
#include <map>
using namespace std;
extern "C" {
#include <libavutil/imgutils.h>
#include <libavutil/parseutils.h>
#include <libswscale/swscale.h>
#include <libavformat/avformat.h>
}
std::map<string, AVPixelFormat> fmtMap;
struct MapInit {
MapInit() {
fmtMap["YUV420"] = AV_PIX_FMT_YUV420P;
fmtMap["NV12"] = AV_PIX_FMT_NV12;
}
} mapInit;
//int ff_load_image(uint8_t *data[4], int linesize[4],
// int *w, int *h, enum AVPixelFormat *pix_fmt,
// const char *filename, void *log_ctx)
//{
// AVInputFormat *iformat = NULL;
// AVFormatContext *format_ctx = NULL;
// AVCodec *codec;
// AVCodecContext *codec_ctx;
// AVFrame *frame;
// int frame_decoded, ret = 0;
// AVPacket pkt;
// AVDictionary *opt = NULL;
//
// av_init_packet(&pkt);
//
// av_register_all();
//
// iformat = av_find_input_format("image2");
// if ((ret = avformat_open_input(&format_ctx, filename, iformat, NULL)) < 0) {
// av_log(log_ctx, AV_LOG_ERROR,
// "Failed to open input file '%s'\n", filename);
// return ret;
// }
//
// if ((ret = avformat_find_stream_info(format_ctx, NULL)) < 0) {
// av_log(log_ctx, AV_LOG_ERROR, "Find stream info failed\n");
// return ret;
// }
//
// codec_ctx = format_ctx->streams[0]->codec;
// codec = avcodec_find_decoder(codec_ctx->codec_id);
// if (!codec) {
// av_log(log_ctx, AV_LOG_ERROR, "Failed to find codec\n");
// ret = AVERROR(EINVAL);
// goto end;
// }
//
// av_dict_set(&opt, "thread_type", "slice", 0);
// if ((ret = avcodec_open2(codec_ctx, codec, &opt)) < 0) {
// av_log(log_ctx, AV_LOG_ERROR, "Failed to open codec\n");
// goto end;
// }
//
// if (!(frame = av_frame_alloc())) {
// av_log(log_ctx, AV_LOG_ERROR, "Failed to alloc frame\n");
// ret = AVERROR(ENOMEM);
// goto end;
// }
//
// ret = av_read_frame(format_ctx, &pkt);
// if (ret < 0) {
// av_log(log_ctx, AV_LOG_ERROR, "Failed to read frame from file\n");
// goto end;
// }
//
// ret = avcodec_decode_video2(codec_ctx, frame, &frame_decoded, &pkt);
// if (ret < 0 || !frame_decoded) {
// av_log(log_ctx, AV_LOG_ERROR, "Failed to decode image from file\n");
// if (ret >= 0)
// ret = -1;
// goto end;
// }
//
// *w = frame->width;
// *h = frame->height;
// *pix_fmt = (AVPixelFormat)frame->format;
//
// if ((ret = av_image_alloc(data, linesize, *w, *h, *pix_fmt, 16)) < 0)
// goto end;
// ret = 0;
//
// av_image_copy(data, linesize, (const uint8_t **)frame->data, frame->linesize, *pix_fmt, *w, *h);
//
//end:
// av_packet_unref(&pkt);
// avcodec_close(codec_ctx);
// avformat_close_input(&format_ctx);
// av_frame_free(&frame);
// av_dict_free(&opt);
//
// if (ret < 0)
// av_log(log_ctx, AV_LOG_ERROR, "Error loading image file '%s'\n", filename);
// return ret;
//}
int load_yuv_image(const char *filename, uint8_t *data[4], int linesize[4],
int width, int height, AVPixelFormat pix_fmt, int frame_index, int* total_frame)
{
FILE *fp;
int file_size;
int frame_size;
fopen_s(&fp, filename, "rb");
if (!fp) {
return -1;
}
fseek(fp, 0, SEEK_END);
file_size = ftell(fp);
fseek(fp, 0, SEEK_SET);
switch (pix_fmt)
{
case AV_PIX_FMT_NV12:
frame_size = width * height + width * height / 2;
if ((file_size - frame_size * frame_index) < frame_size) {
fclose(fp);
return -2;
}
fseek(fp, frame_size * frame_index, SEEK_SET);
fread_s(data[0], width * height, width * height, 1, fp);
fread_s(data[1], width * height / 2, width * height / 2, 1, fp);
break;
case AV_PIX_FMT_YUV420P:
frame_size = width * height + width / 2 * height / 2 + width / 2 * height / 2;
if ((file_size - frame_size * frame_index) < frame_size) {
fclose(fp);
return -2;
}
fseek(fp, frame_size * frame_index, SEEK_SET);
fread_s(data[0], width * height, width * height, 1, fp);
fread_s(data[1], width / 2 * height / 2, width / 2 * height / 2, 1, fp);
fread_s(data[2], width / 2 * height / 2, width / 2 * height / 2, 1, fp);
break;
default:
break;
}
*total_frame = file_size / frame_size;
fclose(fp);
return 0;
}
const uchar* yuv2rgb(const char* src_filename, int src_w, int src_h, char* src_fmt, int dst_w, int dst_h, int frame_idx, int* total_frame)
{
uint8_t *src_data[4] = {};
uint8_t *dst_data[4] = {};
int src_linesize[4], dst_linesize[4];
string srcFormat = src_fmt;
enum AVPixelFormat src_pix_fmt = fmtMap[srcFormat];
enum AVPixelFormat dst_pix_fmt = AV_PIX_FMT_RGB24;
const char *dst_size = NULL;
int dst_bufsize;
struct SwsContext *sws_ctx;
int i = 0, ret;
/* create scaling context */
sws_ctx = sws_getContext(src_w, src_h, src_pix_fmt,
dst_w, dst_h, dst_pix_fmt,
SWS_BILINEAR, NULL, NULL, NULL);
if (!sws_ctx) {
fprintf(stderr,
"Impossible to create scale context for the conversion "
"fmt:%s s:%dx%d -> fmt:%s s:%dx%d\n",
av_get_pix_fmt_name(src_pix_fmt), src_w, src_h,
av_get_pix_fmt_name(dst_pix_fmt), dst_w, dst_h);
ret = AVERROR(EINVAL);
goto end;
}
/* allocate source and destination image buffers */
if ((ret = av_image_alloc(src_data, src_linesize,
src_w, src_h, src_pix_fmt, 16)) < 0) {
fprintf(stderr, "Could not allocate source image\n");
goto end;
}
if ((ret = load_yuv_image(src_filename, src_data, src_linesize, src_w, src_h, src_pix_fmt, frame_idx, total_frame)) < 0) {
fprintf(stderr, "Cannot load source yuv file\n");
goto end;
}
/* buffer is going to be written to rawvideo file, no alignment */
if ((ret = av_image_alloc(dst_data, dst_linesize,
dst_w, dst_h, dst_pix_fmt, 1)) < 0) {
fprintf(stderr, "Could not allocate destination image\n");
goto end;
}
dst_bufsize = ret;
/* convert to destination format */
sws_scale(sws_ctx, (const uint8_t * const*)src_data,
src_linesize, 0, src_h, dst_data, dst_linesize);
end:
av_freep(&src_data[0]);
//av_freep(&dst_data[0]);
sws_freeContext(sws_ctx);
return dst_data[0];
}