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// avcodec_sample.cpp
// A small sample program that shows how to use libavformat and libavcodec to
// read video from a file.
//
// Use
//
// g++ -o avcodec_sample avcodec_sample.cpp -lavformat -lavcodec -lz
//
// to build (assuming libavformat and libavcodec are correctly installed on
// your system).
//
// Run using
//
// avcodec_sample myvideofile.mpg
//
// to write the first five frames from "myvideofile.mpg" to disk in PPM
// format.
#include "ffmpeg_access.h"
#include "avcodec.h"
#include "avformat.h"
#include <stdio.h>
#include <tiffio.h>
#include <errno.h>
typedef int bool;
#define true 1
#define false 0;
static int _ffmpegErrorOccuredFlag;
static char* _ffmpegLastErrorString;
int ffmpegNextFrame(FfmpegMovie* movie){
AVFormatContext *pFormatCtx;
AVCodecContext *pCodecCtx;
int videoStream;
AVFrame *pFrame;
pFormatCtx = movie->pFormatCtx;
pCodecCtx = movie->pCodecCtx;
videoStream = movie->videoStream;
pFrame = movie->pCurrentFrame;
return GetNextFrame(pFormatCtx, pCodecCtx,videoStream,pFrame);
}
int ffmpegConvertCurrentFrame(FfmpegMovie* movie){
img_convert((AVPicture *)movie->pConvertedFrame, PIX_FMT_RGB24, (AVPicture*)movie->pCurrentFrame,movie->pCodecCtx->pix_fmt,movie->pCodecCtx->width,movie->pCodecCtx->height);
}
int GetNextFrame(AVFormatContext *pFormatCtx, AVCodecContext *pCodecCtx,
int videoStream, AVFrame *pFrame)
{
static AVPacket packet;
static int bytesRemaining=0;
static uint8_t *rawData;
static bool fFirstTime=true;
int bytesDecoded;
int frameFinished;
//printf("Getnextframe called \n");
// First time we're called, set packet.data to NULL to indicate it
// doesn't have to be freed
if(fFirstTime)
{
fFirstTime=false;
packet.data=NULL;
}
// Decode packets until we have decoded a complete frame
while(true)
{
// Work on the current packet until we have decoded all of it
while(bytesRemaining > 0)
{
// Decode the next chunk of data
bytesDecoded=avcodec_decode_video(pCodecCtx, pFrame,
&frameFinished, rawData, bytesRemaining);
//printf("Bytes Remaining: %d Bytes Decoded: %d \n",bytesRemaining,bytesDecoded);
// Was there an error?
if(bytesDecoded < 0)
{
fprintf(stderr, "Error while decoding frame\n");
return false;
}
bytesRemaining = bytesRemaining - bytesDecoded;
rawData+=bytesDecoded;
// Did we finish the current frame? Then we can return
if(frameFinished)
return true;
}
//printf("next packet \n");
// Read the next packet, skipping all packets that aren't for this
// stream
do
{
// Free old packet
if(packet.data!=NULL)
av_free_packet(&packet);
// Read new packet
if(av_read_packet(pFormatCtx, &packet)<0)
goto loop_exit;
} while(packet.stream_index!=videoStream);
bytesRemaining=packet.size;
rawData=packet.data;
}
loop_exit:
// Decode the rest of the last frame
bytesDecoded=avcodec_decode_video(pCodecCtx, pFrame, &frameFinished,
rawData, bytesRemaining);
// Free last packet
if(packet.data!=NULL)
av_free_packet(&packet);
return frameFinished!=0;
}
void SaveFrame(AVFrame *pFrame, int width, int height, int iFrame)
{
FILE *pFile;
char szFilename[32];
int y;
// Open file
sprintf(szFilename, "frame%d.ppm", iFrame);
pFile=fopen(szFilename, "wb");
if(pFile==NULL)
return;
// Write header
fprintf(pFile, "P6 %d %d 255\n", width, height);
// Write pixel data
for(y=0; y<height; y++)
fwrite(pFrame->data[0]+y*pFrame->linesize[0], 1, width*3, pFile);
// Close file
fclose(pFile);
}
void ffmpegSetLastErrorOccured(char* msg, int errorCode){
_ffmpegErrorOccuredFlag = errorCode;
_ffmpegLastErrorString = msg;
}
int ffmpegInit(){
// Register all formats and codecs
av_register_all();
ffmpegSetLastErrorOccured("No error.",0);
}
int ffmpegErrorOccured(){
return _ffmpegErrorOccuredFlag;
}
char* ffmpegLastErrorOccured(){
return _ffmpegLastErrorString;
}
//TODO
void ffmpegMovieBackToStart(FfmpegMovie* movie){
FfmpegMovie newMovie;
ffmpegLoadMovie((movie->pFormatCtx->filename),&newMovie);
av_close_input_file(movie->pFormatCtx);
avcodec_close(movie->pCodecCtx);
av_free(((AVPicture *)(movie->pConvertedFrame))->data[0]);
av_free(movie->pCurrentFrame);
free(movie->ppmData);
movie->pFormatCtx = newMovie.pFormatCtx;
movie->pCodecCtx = newMovie.pCodecCtx;
movie->videoStream = newMovie.videoStream;
movie->pCurrentFrame = newMovie.pCurrentFrame;
movie->pConvertedFrame = newMovie.pConvertedFrame;
movie->ppmData = newMovie.ppmData;
}
int ffmpegLoadMovie(char* movieName,FfmpegMovie * resultMovie){
AVFormatContext *pFormatCtx;
int i, videoStream;
AVCodecContext *pCodecCtx;
AVCodec *pCodec;
int numBytes;
uint8_t *buffer;
AVFrame *pFrame;
AVFrame *pFrameRGB;
char* ppmHeader;
int size;
int ret;
// Open video file
ret = av_open_input_file(&pFormatCtx, movieName, NULL, 0, NULL);
if(ret != 0){
printf("ERROR: Could not open file ");
printf(movieName);
printf(" return : %d \n",ret);
//return -1; // Couldn't open file
ffmpegSetLastErrorOccured("Couldn't open file.",-1);
printf("toto 2\n");
return _ffmpegErrorOccuredFlag;
}
// Retrieve stream information
if(av_find_stream_info(pFormatCtx)<0){
printf("ERROR: Could not retrieve stream operation");
printf("\n");
av_close_input_file(pFormatCtx);
//return -1; // Couldn't find stream information
ffmpegSetLastErrorOccured("Couldn't find stream information.",-1);
return _ffmpegErrorOccuredFlag;
}
// Dump information about file onto standard error
//dump_format(pFormatCtx, 0, movieName, false);
// Find the first video stream
videoStream=-1;
for(i=0; i<pFormatCtx->nb_streams; i++)
if(pFormatCtx->streams[i]->codec.codec_type==CODEC_TYPE_VIDEO)
{
videoStream=i;
break;
}
if(videoStream==-1){
printf("ERROR: I didn't find a video stream");
printf("\n");
av_close_input_file(pFormatCtx);
ffmpegSetLastErrorOccured("Didn't find a video stream.",-1);
//return -1; // Didn't find a video stream
return _ffmpegErrorOccuredFlag;
}
// Get a pointer to the codec context for the video stream
pCodecCtx=&pFormatCtx->streams[videoStream]->codec;
// Find the decoder for the video stream
pCodec=avcodec_find_decoder(pCodecCtx->codec_id);
if(pCodec==NULL){
printf("ERROR: Codec not found");
printf("\n");
av_close_input_file(pFormatCtx);
//return -1; // Codec not found
ffmpegSetLastErrorOccured("Codec not found.",-1);
return _ffmpegErrorOccuredFlag;
}
// Inform the codec that we can handle truncated bitstreams -- i.e.,
// bitstreams where frame boundaries can fall in the middle of packets
if(pCodec->capabilities & CODEC_CAP_TRUNCATED){
pCodecCtx->flags|=CODEC_FLAG_TRUNCATED;
}
// Open codec
if(avcodec_open(pCodecCtx, pCodec)<0){
printf("ERROR: Can't open the codec");
printf("\n");
av_close_input_file(pFormatCtx);
//return -1; // Could not open codec
ffmpegSetLastErrorOccured("Could not open codec.",-1);
return _ffmpegErrorOccuredFlag;
}
// Hack to correct wrong frame rates that seem to be generated by some
// codecs
if(pCodecCtx->frame_rate>1000 && pCodecCtx->frame_rate_base==1){
pCodecCtx->frame_rate_base=1000;
}
// Allocate video frame
pFrame=avcodec_alloc_frame();
// Allocate an AVFrame structure
pFrameRGB=avcodec_alloc_frame();
// Determine required buffer size and allocate buffer
numBytes=avpicture_get_size(PIX_FMT_RGB24, pCodecCtx->width,pCodecCtx->height);
buffer = (uint8_t*) malloc(sizeof(uint8_t)*numBytes);
// Assign appropriate parts of buffer to image planes in pFrameRGB
avpicture_fill((AVPicture *)pFrameRGB, buffer, PIX_FMT_RGB24,pCodecCtx->width, pCodecCtx->height);
resultMovie->pFormatCtx = pFormatCtx;
resultMovie->pCodecCtx = pCodecCtx;
resultMovie->videoStream = videoStream;
resultMovie->pCurrentFrame = pFrame;
resultMovie->pConvertedFrame = pFrameRGB;
size = asprintf(&ppmHeader,"P6 %d %d 255\n",pCodecCtx->width, pCodecCtx->height);
size = size + (((pCodecCtx->width)*3)*(pCodecCtx->height));
resultMovie->ppmData = malloc(size);
free(ppmHeader);
ffmpegSetLastErrorOccured("No error.",0);
return _ffmpegErrorOccuredFlag;
}
int saveTIFFPictureToFile(char* fileName,char* buffer,unsigned int width, unsigned int height){
// Define an image
TIFF *image;
// Open the TIFF file
if((image = TIFFOpen(fileName, "w")) == NULL){
printf("Could not open output.tif for writing\n");
return -1;
}
// We need to set some values for basic tags before we can add any data
TIFFSetField(image, TIFFTAG_IMAGEWIDTH, width);
TIFFSetField(image, TIFFTAG_IMAGELENGTH, height);
TIFFSetField(image, TIFFTAG_BITSPERSAMPLE, 16);
TIFFSetField(image, TIFFTAG_SAMPLESPERPIXEL, 3);
TIFFSetField(image, TIFFTAG_ROWSPERSTRIP, height);
TIFFSetField(image, TIFFTAG_COMPRESSION, COMPRESSION_NONE);
TIFFSetField(image, TIFFTAG_PHOTOMETRIC, PHOTOMETRIC_RGB);
TIFFSetField(image, TIFFTAG_FILLORDER, FILLORDER_MSB2LSB);
TIFFSetField(image, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
TIFFSetField(image, TIFFTAG_XRESOLUTION, 150.0);
TIFFSetField(image, TIFFTAG_YRESOLUTION, 150.0);
TIFFSetField(image, TIFFTAG_RESOLUTIONUNIT, RESUNIT_INCH);
// Write the information to the file
printf("Writting file ... %d \n",width*height);
TIFFWriteEncodedStrip(image, 0, buffer, width*height*6);
printf("done ...\n");
// Close the file
TIFFClose(image);
return 0;
}
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