int y4m_write_fields_cb(y4m_cb_writer_t * fd, const y4m_stream_info_t *si,
const y4m_frame_info_t *fi,
uint8_t * const *upper_field,
uint8_t * const *lower_field)
{
int p, err;
int planes = y4m_si_get_plane_count(si);
int numwbuf=0;
const int maxwbuf=32*1024;
uint8_t *wbuf;
/* Write frame header */
if ((err = y4m_write_frame_header_cb(fd, si, fi)) != Y4M_OK) return err;
/* Write each plane */
wbuf=_y4m_alloc(maxwbuf);
for (p = 0; p < planes; p++) {
uint8_t *srctop = upper_field[p];
uint8_t *srcbot = lower_field[p];
int height = y4m_si_get_plane_height(si, p);
int width = y4m_si_get_plane_width(si, p);
int y;
/* alternately write one line from each field */
for (y = 0; y < height; y += 2) {
if( width*2 >= maxwbuf ) {
if (y4m_write_cb(fd, srctop, width)) goto y4merr;
if (y4m_write_cb(fd, srcbot, width)) goto y4merr;
} else {
if (numwbuf + 2 * width > maxwbuf) {
if(y4m_write_cb(fd, wbuf, numwbuf)) goto y4merr;
numwbuf=0;
}
veejay_memcpy(wbuf+numwbuf,srctop,width); numwbuf += width;
veejay_memcpy(wbuf+numwbuf,srcbot,width); numwbuf += width;
}
srctop += width;
srcbot += width;
}
}
if( numwbuf )
if( y4m_write_cb(fd, wbuf, numwbuf) )
goto y4merr;
_y4m_free(wbuf);
return Y4M_OK;
y4merr:
_y4m_free(wbuf);
return Y4M_ERR_SYSTEM;
}
int y4m_read_fields_data_cb(y4m_cb_reader_t * fd, const y4m_stream_info_t *si,
y4m_frame_info_t *fi,
uint8_t * const *upper_field,
uint8_t * const *lower_field)
{
int p;
int planes = y4m_si_get_plane_count(si);
const int maxrbuf=32*1024;
uint8_t *rbuf=_y4m_alloc(maxrbuf);
int rbufpos=0,rbuflen=0;
/* Read each plane */
for (p = 0; p < planes; p++) {
uint8_t *dsttop = upper_field[p];
uint8_t *dstbot = lower_field[p];
int height = y4m_si_get_plane_height(si, p);
int width = y4m_si_get_plane_width(si, p);
int y;
/* alternately read one line into each field */
for (y = 0; y < height; y += 2) {
if( width*2 >= maxrbuf ) {
if (y4m_read_cb(fd, dsttop, width)) goto y4merr;
if (y4m_read_cb(fd, dstbot, width)) goto y4merr;
} else {
if( rbufpos==rbuflen ) {
rbuflen=(height-y)*width;
if( rbuflen>maxrbuf )
rbuflen=maxrbuf-maxrbuf%(2*width);
if( y4m_read_cb(fd,rbuf,rbuflen) )
goto y4merr;
rbufpos=0;
}
veejay_memcpy(dsttop,rbuf+rbufpos,width); rbufpos+=width;
veejay_memcpy(dstbot,rbuf+rbufpos,width); rbufpos+=width;
}
dsttop+=width;
dstbot+=width;
}
}
_y4m_free(rbuf);
return Y4M_OK;
y4merr:
_y4m_free(rbuf);
return Y4M_ERR_SYSTEM;
}
void y4m_fini_xtag_list(y4m_xtag_list_t *xtags)
{
int i;
for (i = 0; i < Y4M_MAX_XTAGS; i++) {
if (xtags->tags[i] != NULL) {
_y4m_free(xtags->tags[i]);
xtags->tags[i] = NULL;
}
}
xtags->count = 0;
}
