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Problem with linking FFMPEG's libraries

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The_Fearless

Joined: 31 Jul 2007
Posts: 2

Posted: Tue Jul 31, 2007 12:45 am Post subject: Problem with linking FFMPEG's libraries

Hi,
I'm trying to use FFMPEG in a program, but i've got a problem... I can compile the 4 libraries, and i want to use them in this program (that's just the first version, it'll be a video player):

Code:

#include <pspkernel.h>
#include <pspdebug.h>
#include <pspctrl.h>
#include <stdlib.h>
#include <string.h>

#include "../ffmpeg/libavcodec/avcodec.h"
#include "../ffmpeg/libavformat/avformat.h"
#include "../ffmpeg/libavformat/avio.h"
#include "../ffmpeg/libavcodec/opt.h"
#include "../ffmpeg/libavutil/fifo.h"
#include "../ffmpeg/libavutil/avstring.h"

PSP_MODULE_INFO("CONTROLTEST", 0, 1, 1);

#define printf pspDebugScreenPrintf

int done = 0;

int exit_callback(int arg1, int arg2, void *common)
{
return 0;
}

/* Callback thread */
int CallbackThread(SceSize args, void *argp)
{
int cbid;

cbid = sceKernelCreateCallback("Exit Callback", exit_callback, NULL);
sceKernelRegisterExitCallback(cbid);
sceKernelSleepThreadCB();

return 0;
}

/* Sets up the callback thread and returns its thread id */
int SetupCallbacks(void)
{
int thid = 0;

thid = sceKernelCreateThread("update_thread", CallbackThread,
            0x11, 0xFA0, 0, 0);
if(thid >= 0)
{
   sceKernelStartThread(thid, 0, 0);
}

return thid;
}

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\n%d %d\n255\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);
}

int main(void) {
SceCtrlData pad;

pspDebugScreenInit();
SetupCallbacks();

sceCtrlSetSamplingCycle(0);
sceCtrlSetSamplingMode(PSP_CTRL_MODE_ANALOG);

printf("Press X to rip frame");

while(!done){
   pspDebugScreenSetXY(0, 2);

   sceCtrlReadBufferPositive(&pad, 1);

   if (pad.Buttons != 0){
      if (pad.Buttons & PSP_CTRL_CROSS){
         printf("Ripping Frame");
         //Start of Movie Rip
         av_register_all();

         AVFormatContext *pFormatCtx;
         // Open video file
         if(av_open_input_file(&pFormatCtx, "prova.avi", NULL, 0, NULL)!=0)
            return -1; // Couldn't open file

         // Retrieve stream information
         if(av_find_stream_info(pFormatCtx)<0)
            return -1; // Couldn't find stream information

         // Dump information about file onto standard error
         dump_format(pFormatCtx, 0, "prova.avi", 0);

         int i;
         AVCodecContext *pCodecCtx;

         // Find the first video stream
         int 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)
            return -1; // Didn't find a video stream

         // Get a pointer to the codec context for the video stream
         pCodecCtx=pFormatCtx->streams[videoStream]->codec;

         AVCodec *pCodec;

         // Find the decoder for the video stream
         pCodec=avcodec_find_decoder(pCodecCtx->codec_id);

         if(pCodec==NULL) {
            fprintf(stderr, "Unsupported codec!\n");
            return -1; // Codec not found
            }

         // Open codec
         if(avcodec_open(pCodecCtx, pCodec)<0)
            return -1; // Could not open codec

         AVFrame *pFrame;
         AVFrame *pFrameRGB;

         // Allocate video frame
         pFrame=avcodec_alloc_frame();

         // Allocate an AVFrame structure
         pFrameRGB=avcodec_alloc_frame();

         if(pFrameRGB==NULL)
         return -1;

         uint8_t *buffer;
         int numBytes;
         // Determine required buffer size and allocate buffer
         numBytes=avpicture_get_size(PIX_FMT_RGB24, pCodecCtx->width,pCodecCtx->height);

         buffer=(uint8_t *)av_malloc(numBytes*sizeof(uint8_t));

         // Assign appropriate parts of buffer to image planes in pFrameRGB
         // Note that pFrameRGB is an AVFrame, but AVFrame is a superset
         // of AVPicture
         avpicture_fill((AVPicture *)pFrameRGB, buffer, PIX_FMT_RGB24,
               pCodecCtx->width, pCodecCtx->height);

         int frameFinished;
         AVPacket packet;

         i=0;
         while(av_read_frame(pFormatCtx, &packet)>=0) {
         // Is this a packet from the video stream?
            if(packet.stream_index==videoStream) {
            // Decode video frame
            avcodec_decode_video(pCodecCtx, pFrame, &frameFinished,
packet.data, packet.size);

            // Did we get a video frame?
            if(frameFinished) {
               // Convert the image from its native format to RGB
               img_convert((AVPicture *)pFrameRGB, PIX_FMT_RGB24,
(AVPicture*)pFrame, pCodecCtx->pix_fmt,
         pCodecCtx->width, pCodecCtx->height);
               // Save the frame to disk
               if(++i<=5)
               SaveFrame(pFrameRGB, pCodecCtx->width, pCodecCtx->height, i);
            }
            }
            // Free the packet that was allocated by av_read_frame
            av_free_packet(&packet);
         }

// Free the RGB image
         av_free(buffer);
         av_free(pFrameRGB);

         // Free the YUV frame
         av_free(pFrame);

         // Close the codec
         avcodec_close(pCodecCtx);

         // Close the video file
         av_close_input_file(pFormatCtx);


         return 0;
         }
}
}

printf("Finito. Ritorno all'XMB...");

sceKernelExitGame();
return 0;
}

But when i try to compile the code it displays this:

Code:

XP@xp- ~/PSP_Video_Player
$ make
psp-gcc -I. -I/usr/local/pspdev/psp/sdk/include -O2 -G0 -Wall -lavutil -lavforma
t -lavcodec -lz -lavutil -lm -D_PSP_FW_VERSION=150 -c -o main.o main.c
main.c: In function 'main':
main.c:187: warning: 'img_convert' is deprecated (declared at ../ffmpeg/libavcod
ec/avcodec.h:2395)
psp-gcc: -lavutil: linker input file unused because linking not done
psp-gcc: -lavformat: linker input file unused because linking not done
psp-gcc: -lavcodec: linker input file unused because linking not done
psp-gcc: -lz: linker input file unused because linking not done
psp-gcc: -lavutil: linker input file unused because linking not done
psp-gcc: -lm: linker input file unused because linking not done
psp-gcc -I. -I/usr/local/pspdev/psp/sdk/include -O2 -G0 -Wall -lavutil -lavforma
t -lavcodec -lz -lavutil -lm -D_PSP_FW_VERSION=150 -L. -L/usr/local/pspdev/psp/
sdk/lib main.o -lavutil -lavformat -lavcodec -lz -lavutil -lm -lpspdebug -lpsp
display -lpspge -lpspctrl -lpspsdk -lc -lpspnet -lpspnet_inet -lpspnet_apctl -lp
spnet_resolver -lpsputility -lpspuser -lpspkernel -o main.elf
main.o: In function `main':
main.c:(.text+0x218): undefined reference to `av_register_all'
main.c:(.text+0x230): undefined reference to `av_open_input_file'
main.c:(.text+0x2ac): undefined reference to `av_find_stream_info'
main.c:(.text+0x2c8): undefined reference to `dump_format'
main.c:(.text+0x2f4): undefined reference to `avcodec_find_decoder'
main.c:(.text+0x304): undefined reference to `avcodec_open'
main.c:(.text+0x314): undefined reference to `avcodec_alloc_frame'
main.c:(.text+0x31c): undefined reference to `avcodec_alloc_frame'
main.c:(.text+0x338): undefined reference to `avpicture_get_size'
main.c:(.text+0x340): undefined reference to `av_malloc'
main.c:(.text+0x360): undefined reference to `avpicture_fill'
main.c:(.text+0x36c): undefined reference to `av_read_frame'
main.c:(.text+0x3d0): undefined reference to `avcodec_decode_video'
main.c:(.text+0x3f8): undefined reference to `img_convert'
main.c:(.text+0x438): undefined reference to `av_free'
main.c:(.text+0x440): undefined reference to `av_free'
main.c:(.text+0x448): undefined reference to `av_free'
main.c:(.text+0x450): undefined reference to `avcodec_close'
main.c:(.text+0x458): undefined reference to `av_close_input_file'
collect2: ld returned 1 exit status
make: *** [main.elf] Error 1

I understand that it's a problem with the linking of the libs, but i don't know how to fix it... Please help me XD

chp

Joined: 23 Jun 2004
Posts: 313

Posted: Tue Jul 31, 2007 12:59 am Post subject:

Either order your libraries properly (gcc ld will only find symbols imported from libs earlier in the linking process, so -la -lb isn't the same as -lb -la), or you can group all your libs like this: gcc -o executable.elf -Wl,--start-group -lone -ltwo -lthree -Wl,--end-group That will tell the linker to continue looking for symbols if it cannot find them in the currently available ones (more like how it works on other compilers). _________________ GE Dominator

The_Fearless

Joined: 31 Jul 2007
Posts: 2

Posted: Tue Jul 31, 2007 1:18 am Post subject:

mmm...

I'm using this makefile to build my program:

Code:

TARGET = main
OBJS = main.o

INCDIR =

CFLAGS = -O2 -G0 -Wall

CXXFLAGS = $(CFLAGS) -fno-exceptions -fno-rtti

ASFLAGS = $(CFLAGS)

LIBDIR =
LIBS = -lavcodec -lavformat -lavutil -lz -lavutil -lm

PSPSDK=$(shell psp-config --pspsdk-path)

LDFLAGS =

EXTRA_TARGETS = EBOOT.PBP

PSP_EBOOT_TITLE = Basic PSP Movie Player

include $(PSPSDK)/lib/build.mak

and it now gives this error:

Code:

$ make
psp-gcc -I. -I/usr/local/pspdev/psp/sdk/include -O2 -G0 -Wall -D_PSP_FW_VERSION=
150 -c -o main.o main.c
main.c: In function 'main':
main.c:187: warning: 'img_convert' is deprecated (declared at ../ffmpeg/libavcod
ec/avcodec.h:2395)
psp-gcc -I. -I/usr/local/pspdev/psp/sdk/include -O2 -G0 -Wall -D_PSP_FW_VERSION=
150 -L. -L/usr/local/pspdev/psp/sdk/lib main.o -lavcodec -lavformat -lavutil
-lz -lavutil -lm -lpspdebug -lpspdisplay -lpspge -lpspctrl -lpspsdk -lc -lpspnet
-lpspnet_inet -lpspnet_apctl -lpspnet_resolver -lpsputility -lpspuser -lpspkern
el -o main.elf
main.o: In function `main':
main.c:(.text+0x218): undefined reference to `av_register_all'
main.c:(.text+0x230): undefined reference to `av_open_input_file'
main.c:(.text+0x2ac): undefined reference to `av_find_stream_info'
main.c:(.text+0x2c8): undefined reference to `dump_format'
main.c:(.text+0x2f4): undefined reference to `avcodec_find_decoder'
main.c:(.text+0x304): undefined reference to `avcodec_open'
main.c:(.text+0x314): undefined reference to `avcodec_alloc_frame'
main.c:(.text+0x31c): undefined reference to `avcodec_alloc_frame'
main.c:(.text+0x338): undefined reference to `avpicture_get_size'
main.c:(.text+0x340): undefined reference to `av_malloc'
main.c:(.text+0x360): undefined reference to `avpicture_fill'
main.c:(.text+0x36c): undefined reference to `av_read_frame'
main.c:(.text+0x3d0): undefined reference to `avcodec_decode_video'
main.c:(.text+0x3f8): undefined reference to `img_convert'
main.c:(.text+0x438): undefined reference to `av_free'
main.c:(.text+0x440): undefined reference to `av_free'
main.c:(.text+0x448): undefined reference to `av_free'
main.c:(.text+0x450): undefined reference to `avcodec_close'
main.c:(.text+0x458): undefined reference to `av_close_input_file'
collect2: ld returned 1 exit status
make: *** [main.elf] Error 1

There's still the undefined reference error...

EDIT: Is there any way to know if a lib is compiled the right way?

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