Hi,
I've just compiled libmpeg2 for an embedded platform and have written some code
for decoding. But the call to mpeg2_parse in this code seems to always return
STATE_INVALID.
int play(FILE * mpgfile)
{
mpeg2dec_t * decoder;
const mpeg2_info_t * info;
mpeg2_state_t state;
size_t size = 1;
unsigned char *buffer = malloc(BUFFER_SIZE);
char debug[20];
if (!buffer) {
show_msgbox("NspireMoviePlayer","NULL ptr from Malloc");
return 1;
}
decoder = mpeg2_init ();
if (!decoder) {
show_msgbox("NspireMoviePlayer","Could not init mpeg2");
return 1;
}
info = mpeg2_info (decoder);
do
{
state = mpeg2_parse (decoder);
switch (state) {
case STATE_BUFFER:
size = fread (buffer, 1, BUFFER_SIZE, mpgfile);
mpeg2_buffer (decoder, buffer, buffer + size);
break;
case STATE_SEQUENCE:
mpeg2_convert (decoder, mpeg2convert_rgb24, NULL);
settimerperiod(info->sequence->frame_period);
break;
case STATE_SLICE:
case STATE_END:
if (info->sequence->width != SCREEN_WIDTH ||
info->sequence->height != SCREEN_HEIGHT)
{
show_msgbox("NspireMoviePlayer","Screen
size mismatch");
goto die;
}
else {
waittimerperiod();
renderframe(info->display_fbuf->buf[0]);
}
break;
case STATE_INVALID:
goto die;
break;
default:
break;
}
} while(size);
mpeg2_close(decoder);
return 0;
die:
mpeg2_close(decoder);
return 1;
}
I dug around decode.c and added some debugging messages and it seems it's
conking out in this piece of code at the bottom of mpeg2_parse:
mpeg2dec->action = mpeg2_seek_header;
switch (mpeg2dec->code) {
case 0x00:
show_msgbox("libmpeg2","case 0 mpeg2dec->code");
return mpeg2dec->state;
case 0xb3:
case 0xb7:
case 0xb8:
show_msgbox("libmpeg2","case b8 mpeg2dec->code");
return (mpeg2dec->state == STATE_SLICE) ? STATE_SLICE : STATE_INVALID;
default:
mpeg2dec->action = seek_chunk;
show_msgbox("libmpeg2","default mpeg2dec->code"); // This is where it
returns
return STATE_INVALID;
}
Does anyone have any ideas on what could be causing this? The code isn't very
well documented and it's hard to follow.
Cheers,
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