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From chen hecky <hecky.c...@gmail.com>
Subject Re: Some questions about Dirac
Date Fri, 27 Mar 2009 08:52:52 GMT
I find it in my whole system, but I don't find it's definition.  :-(

2009/3/27 Samul Kevin <lovesummerf@gmail.com>

> 2009/3/24 chen hecky <hecky.chen@gmail.com>
>
> > Thank  J Aaron Farr,
> > I have studied using Dirac(http://diracvideo.org/), which maybe replace
> > the
> > FFmpeg, but there are some problem in compiling the programmer from the
> > programmers_guide.
> >
> >
> >
> > ////the programmer codes text.c
> > *
> > #include <errno.h>
> > #include <stdio.h>
> > #include <stdlib.h>
> >
> >
> >
> > /* Include Dirac Encoder Header file */
> > #include <libdirac_encoder/dirac_encoder.h>
> > //#include "/usr/local/include/dirac/libdirac_encoder/dirac_encoder.h"
> > #define ENCBUF_SIZE (1024*1024)
> > int main (int argc, char **argv)
> > {
> >    FILE *in;
> >    FILE *out;
> >    dirac_encoder_context_t enc_ctx;
> >    dirac_encoder_t *encoder;
> >    unsigned char *unc_frame;
> >    int unc_frame_size;
> >    unsigned char enc_frame[ENCBUF_SIZE];
> >    int go = 1;
> >    dirac_encoder_state_t state;
> >    if (argc < 3)
> >    {
> >        printf ("Usage : %s input-file output-file\n", argv[0]);
> >        exit(0);
> >    }
> >    /* open input file */
> >    if ( (in = fopen (argv[1], "rb")) == NULL)
> >    {
> >        perror (argv[1]);
> >        exit(errno);
> >    }
> >    /* open output file */
> >    if ( (out = fopen (argv[2], "wb")) == NULL)
> >    {
> >        perror (argv[2]);
> >        exit(errno);
> >    }
> > /* set flag to retrieve locally decoded frames from encoder */
> > enc_ctx.decode_flag = 1;
> > /* Initialise the encoder with the encoder context */
> > if ( (encoder = dirac_encoder_init(&enc_ctx, 0)) == NULL)
> > {
> >    printf ("Error initialising the encoder\n");
> >    exit(-1);
> > }
> > /* Calculate the size of an uncompressed frame */
> > unc_frame_size = (encoder->enc_ctx.src_params.height *
> >   encoder->enc_ctx.src_params.width) +
> >   2*(encoder->enc_ctx.src_params.chroma_height
> >            * encoder->enc_ctx.src_params.chroma_width);
> > /* Allocate memory for an uncompressed frame */
> > unc_frame = (unsigned char *)malloc(unc_frame_size);
> > /* Main loop */
> > do
> > {
> >    /*
> >    * Read one frame of uncompressed data into the buffer and
> >    * load it into the encoder
> >    */
> >    if ( fread( unc_frame, unc_frame_size, 1, in) == 1)
> >    {
> >         if (dirac_encoder_load( encoder, unc_frame, unc_frame_size ) < 0)
> >         {
> >              fprintf (stderr, "dirac_encoder_load failed. Unrecoverable
> > error...\n");
> >              exit(-1);
> >         }
> >    }
> >    else
> >    {
> >         /* signal end of sequence to encoder */
> >         dirac_encoder_end_sequence( encoder );
> >    }
> >    do
> >    {
> >         /*
> >         * Frame loaded successfully, so now set up the encode
> >         * buffer in the encoder handler before calling the
> >         * encoding function.
> >         */
> >         encoder->enc_buf.buffer = enc_frame;
> >         encoder->enc_buf.size = ENCBUF_SIZE;
> >         /* Call the encoding function */
> >         state = dirac_encoder_output (encoder);
> >         /*
> >         * Depending on the return value of the encode function
> >         * take appropriate action
> >         */
> >         switch (state)
> >         {
> >         case ENC_STATE_AVAIL:
> >             /*
> >             * Encoded picture available in enc_buf. Write the
> >             * buffer to the output file
> >             */
> >
> >    /* Initialise the encoder context with presets for SD576I50 */
> >    dirac_encoder_context_init (&enc_ctx, VIDEO_FORMAT_SD576I50);
> >    /* override some of the preset defaults */
> >    /* Set quality factor to 7.5 */
> >    enc_ctx.enc_params.qf = 7.5;
> >    /* set input video type to progressive video */
> >    enc_ctx.source_params.source_sampling = 0;
> >
> >
> >               fwrite (encoder->enc_buf.buffer, encoder->enc_buf.size,
> >                       1, out);
> >               /*
> >               * In addition to the encoded picture, the following
> metadata
> >               * is also available.
> >               * encoded picture stats in encoder->enc_pstats
> >               * encoded picture params in encoder->enc_pparams
> >               */
> >               break;
> >          case ENC_STATE_BUFFER:
> >               /*
> >               * Encoder needs more data to continue processing
> >               */
> >               break;
> >          case ENC_STATE_EOS:
> >               /*
> >               * End of sequence info available in enc_buf. Write the
> >               * buffer to the output file
> >               */
> >               fwrite (encoder->enc_buf.buffer, encoder->enc_buf.size,
> >                       1, out);
> >               /*
> >               * In addition to the encoded picture, the following
> metadata
> >               * is also available.
> >               * encoded sequence stats in encoder->enc_seqstats
> >               */
> >               break;
> >          case ENC_STATE_INVALID:
> >          default:
> >               printf ("Irrecoverable error. quitting...");
> >               free (unc_frame);
> >               dirac_encoder_close(encoder);
> >               exit(-1);
> >               break;
> >          }
> >          if (encoder->decoded_frame_avail)
> >          {
> >               /*
> >               * Locally decoded frame available in encoder->dec_buf
> >               */
> >          }
> >          if (encoder->instr_data_avail)
> >          {
> >               /*
> >               * Instrumentation data available in encoder->instr
> >               */
> >          }
> >      } while (state == ENC_STATE_AVAIL);
> >  } while (go);
> >  /* Free the encoder resources */
> >  dirac_encoder_close(encoder);
> >  /* Free the uncompressed data buffer */
> >  free (unc_frame);
> >  fclose (in);
> >  fclose (out);
> > }
> > *
> > Some error:
> >
> > *root@:~/Desktop/Test# gcc -I/usr/local/include/dirac text.c
> > text.c: In function ‘main’:
>
> ->>missing any header file which including the definition of
> VIDEO_FORMAT_SD576I50?
>
> >
> > text.c:98: error: ‘VIDEO_FORMAT_SD576I50’ undeclared (first use in this
> > function)
>
>
>
> >
> > text.c:98: error: (Each undeclared identifier is reported only once
> > text.c:98: error: for each function it appears in.)
> > text.c:103: error: ‘dirac_encoder_context_t’ has no member named
> > ‘source_params’*
> >
> > If anyone had used Dirac, can you give some suggestions?
> >
> >
> > Hecky @ Bluesky Dev Team XJTU
> >
>
>
>
> --
> Bowen Ma a.k.a Samul Kevin @ Bluesky Dev Team    XJTU
>



-- 
Hecky @ Bluesky Dev Team XJTU

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