/* build the comment header packet from the passed metadata */
int theora_encode_comment(theora_comment *tc, ogg_packet *op)
{
const char *vendor = theora_version_string();
const int vendor_length = strlen(vendor);
oggpack_buffer *opb;
#ifndef LIBOGG2
opb = _ogg_malloc(sizeof(oggpack_buffer));
oggpackB_writeinit(opb);
#else
opb = _ogg_malloc(oggpack_buffersize());
oggpackB_writeinit(opb, ogg_buffer_create());
#endif
oggpackB_write(opb, 0x81, 8);
_tp_writebuffer(opb, "theora", 6);
_tp_writelsbint(opb, vendor_length);
_tp_writebuffer(opb, vendor, vendor_length);
_tp_writelsbint(opb, tc->comments);
if(tc->comments){
int i;
for(i=0;i<tc->comments;i++){
if(tc->user_comments[i]){
_tp_writelsbint(opb,tc->comment_lengths[i]);
_tp_writebuffer(opb,tc->user_comments[i],tc->comment_lengths[i]);
}else{
oggpackB_write(opb,0,32);
}
}
}
op->bytes=oggpack_bytes(opb);
#ifndef LIBOGG2
/* So we're expecting the application will free this? */
op->packet=_ogg_malloc(oggpack_bytes(opb));
memcpy(op->packet, oggpack_get_buffer(opb), oggpack_bytes(opb));
oggpack_writeclear(opb);
#else
op->packet = oggpack_writebuffer(opb);
/* When the application puts op->packet into a stream_state object,
it becomes the property of libogg2's internal memory management. */
#endif
_ogg_free(opb);
op->b_o_s=0;
op->e_o_s=0;
op->packetno=0;
op->granulepos=0;
return (0);
}
/* build the final header packet with the tables required
for decode */
int theora_encode_tables(theora_state *t, ogg_packet *op){
CP_INSTANCE *cpi=(CP_INSTANCE *)(t->internal_encode);
#ifndef LIBOGG2
oggpackB_reset(cpi->oggbuffer);
#else
oggpackB_writeinit(cpi->oggbuffer, cpi->oggbufferstate);
#endif
oggpackB_write(cpi->oggbuffer,0x82,8);
_tp_writebuffer(cpi->oggbuffer,"theora",6);
WriteFilterTables(&cpi->pb,cpi->oggbuffer);
WriteQTables(&cpi->pb,cpi->oggbuffer);
WriteHuffmanTrees(cpi->pb.HuffRoot_VP3x,cpi->oggbuffer);
#ifndef LIBOGG2
op->packet=oggpackB_get_buffer(cpi->oggbuffer);
#else
op->packet=oggpackB_writebuffer(cpi->oggbuffer);
#endif
op->bytes=oggpackB_bytes(cpi->oggbuffer);
op->b_o_s=0;
op->e_o_s=0;
op->packetno=0;
op->granulepos=0;
cpi->packetflag=0;
return(0);
}
/* build the initial short header for stream recognition and format */
int theora_encode_header(theora_state *t, ogg_packet *op){
CP_INSTANCE *cpi=(CP_INSTANCE *)(t->internal_encode);
int offset_y;
#ifndef LIBOGG2
oggpackB_reset(cpi->oggbuffer);
#else
oggpackB_writeinit(cpi->oggbuffer, cpi->oggbufferstate);
#endif
oggpackB_write(cpi->oggbuffer,0x80,8);
_tp_writebuffer(cpi->oggbuffer, "theora", 6);
oggpackB_write(cpi->oggbuffer,VERSION_MAJOR,8);
oggpackB_write(cpi->oggbuffer,VERSION_MINOR,8);
oggpackB_write(cpi->oggbuffer,VERSION_SUB,8);
oggpackB_write(cpi->oggbuffer,cpi->pb.info.width>>4,16);
oggpackB_write(cpi->oggbuffer,cpi->pb.info.height>>4,16);
oggpackB_write(cpi->oggbuffer,cpi->pb.info.frame_width,24);
oggpackB_write(cpi->oggbuffer,cpi->pb.info.frame_height,24);
oggpackB_write(cpi->oggbuffer,cpi->pb.info.offset_x,8);
/* Applications use offset_y to mean offset from the top of the image; the
* meaning in the bitstream is the opposite (from the bottom). Transform.
*/
offset_y = cpi->pb.info.height - cpi->pb.info.frame_height -
cpi->pb.info.offset_y;
oggpackB_write(cpi->oggbuffer,offset_y,8);
oggpackB_write(cpi->oggbuffer,cpi->pb.info.fps_numerator,32);
oggpackB_write(cpi->oggbuffer,cpi->pb.info.fps_denominator,32);
oggpackB_write(cpi->oggbuffer,cpi->pb.info.aspect_numerator,24);
oggpackB_write(cpi->oggbuffer,cpi->pb.info.aspect_denominator,24);
oggpackB_write(cpi->oggbuffer,cpi->pb.info.colorspace,8);
oggpackB_write(cpi->oggbuffer,cpi->pb.info.target_bitrate,24);
oggpackB_write(cpi->oggbuffer,cpi->pb.info.quality,6);
oggpackB_write(cpi->oggbuffer,cpi->pb.keyframe_granule_shift,5);
oggpackB_write(cpi->oggbuffer,cpi->pb.info.pixelformat,2);
oggpackB_write(cpi->oggbuffer,0,3); /* spare config bits */
#ifndef LIBOGG2
op->packet=oggpackB_get_buffer(cpi->oggbuffer);
#else
op->packet=oggpackB_writebuffer(cpi->oggbuffer);
#endif
op->bytes=oggpackB_bytes(cpi->oggbuffer);
op->b_o_s=1;
op->e_o_s=0;
op->packetno=0;
op->granulepos=0;
cpi->packetflag=0;
return(0);
}
/* build the comment header packet from the passed metadata */
int theora_encode_comment(theora_comment *tc, ogg_packet *op)
{
const char *vendor = theora_version_string();
const int vendor_length = strlen(vendor);
oggpack_buffer *opb;
opb = _ogg_malloc(sizeof(oggpack_buffer));
oggpackB_writeinit(opb);
oggpackB_write(opb, 0x81, 8);
_tp_writebuffer(opb, "theora", 6);
_tp_writelsbint(opb, vendor_length);
_tp_writebuffer(opb, vendor, vendor_length);
_tp_writelsbint(opb, tc->comments);
if(tc->comments){
int i;
for(i=0;i<tc->comments;i++){
if(tc->user_comments[i]){
_tp_writelsbint(opb,tc->comment_lengths[i]);
_tp_writebuffer(opb,tc->user_comments[i],tc->comment_lengths[i]);
}else{
oggpackB_write(opb,0,32);
}
}
}
op->bytes=oggpack_bytes(opb);
/* So we're expecting the application will free this? */
op->packet=_ogg_malloc(oggpack_bytes(opb));
memcpy(op->packet, oggpack_get_buffer(opb), oggpack_bytes(opb));
oggpack_writeclear(opb);
_ogg_free(opb);
op->b_o_s=0;
op->e_o_s=0;
op->packetno=0;
op->granulepos=0;
return (0);
}
