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’:
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
