122 lines
4.3 KiB
C
122 lines
4.3 KiB
C
#include <stdlib.h>
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#include <string.h>
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#include "internal.h"
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#include "enquant.h"
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#include "huffenc.h"
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/*Packs a series of octets from a given byte array into the pack buffer.
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_opb: The pack buffer to store the octets in.
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_buf: The byte array containing the bytes to pack.
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_len: The number of octets to pack.*/
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static void oc_pack_octets(oggpack_buffer *_opb,const char *_buf,int _len){
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int i;
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for(i=0;i<_len;i++)oggpackB_write(_opb,_buf[i],8);
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}
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int oc_state_flushheader(oc_theora_state *_state,int *_packet_state,
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oggpack_buffer *_opb,const th_quant_info *_qinfo,
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const th_huff_code _codes[TH_NHUFFMAN_TABLES][TH_NDCT_TOKENS],
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const char *_vendor,th_comment *_tc,ogg_packet *_op){
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unsigned char *packet;
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int b_o_s;
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if(_op==NULL)return TH_EFAULT;
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switch(*_packet_state){
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/*Codec info header.*/
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case OC_PACKET_INFO_HDR:{
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if(_state==NULL)return TH_EFAULT;
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oggpackB_reset(_opb);
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/*Mark this packet as the info header.*/
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oggpackB_write(_opb,0x80,8);
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/*Write the codec string.*/
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oc_pack_octets(_opb,"theora",6);
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/*Write the codec bitstream version.*/
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oggpackB_write(_opb,TH_VERSION_MAJOR,8);
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oggpackB_write(_opb,TH_VERSION_MINOR,8);
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oggpackB_write(_opb,TH_VERSION_SUB,8);
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/*Describe the encoded frame.*/
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oggpackB_write(_opb,_state->info.frame_width>>4,16);
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oggpackB_write(_opb,_state->info.frame_height>>4,16);
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oggpackB_write(_opb,_state->info.pic_width,24);
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oggpackB_write(_opb,_state->info.pic_height,24);
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oggpackB_write(_opb,_state->info.pic_x,8);
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oggpackB_write(_opb,_state->info.pic_y,8);
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oggpackB_write(_opb,_state->info.fps_numerator,32);
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oggpackB_write(_opb,_state->info.fps_denominator,32);
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oggpackB_write(_opb,_state->info.aspect_numerator,24);
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oggpackB_write(_opb,_state->info.aspect_denominator,24);
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oggpackB_write(_opb,_state->info.colorspace,8);
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oggpackB_write(_opb,_state->info.target_bitrate,24);
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oggpackB_write(_opb,_state->info.quality,6);
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oggpackB_write(_opb,_state->info.keyframe_granule_shift,5);
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oggpackB_write(_opb,_state->info.pixel_fmt,2);
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/*Spare configuration bits.*/
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oggpackB_write(_opb,0,3);
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b_o_s=1;
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}break;
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/*Comment header.*/
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case OC_PACKET_COMMENT_HDR:{
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int vendor_len;
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int i;
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if(_tc==NULL)return TH_EFAULT;
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vendor_len=strlen(_vendor);
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oggpackB_reset(_opb);
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/*Mark this packet as the comment header.*/
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oggpackB_write(_opb,0x81,8);
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/*Write the codec string.*/
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oc_pack_octets(_opb,"theora",6);
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/*Write the vendor string.*/
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oggpack_write(_opb,vendor_len,32);
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oc_pack_octets(_opb,_vendor,vendor_len);
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oggpack_write(_opb,_tc->comments,32);
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for(i=0;i<_tc->comments;i++){
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if(_tc->user_comments[i]!=NULL){
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oggpack_write(_opb,_tc->comment_lengths[i],32);
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oc_pack_octets(_opb,_tc->user_comments[i],_tc->comment_lengths[i]);
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}
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else oggpack_write(_opb,0,32);
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}
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b_o_s=0;
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}break;
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/*Codec setup header.*/
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case OC_PACKET_SETUP_HDR:{
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int ret;
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oggpackB_reset(_opb);
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/*Mark this packet as the setup header.*/
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oggpackB_write(_opb,0x82,8);
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/*Write the codec string.*/
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oc_pack_octets(_opb,"theora",6);
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/*Write the quantizer tables.*/
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oc_quant_params_pack(_opb,_qinfo);
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/*Write the huffman codes.*/
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ret=oc_huff_codes_pack(_opb,_codes);
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/*This should never happen, because we validate the tables when they
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are set.
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If you see, it's a good chance memory is being corrupted.*/
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if(ret<0)return ret;
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b_o_s=0;
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}break;
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/*No more headers to emit.*/
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default:return 0;
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}
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/*This is kind of fugly: we hand the user a buffer which they do not own.
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We will overwrite it when the next packet is output, so the user better be
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done with it by then.
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Vorbis is little better: it hands back buffers that it will free the next
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time the headers are requested, or when the encoder is cleared.
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Hopefully libogg2 will make this much cleaner.*/
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packet=oggpackB_get_buffer(_opb);
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/*If there's no packet, malloc failed while writing.*/
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if(packet==NULL)return TH_EFAULT;
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_op->packet=packet;
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_op->bytes=oggpackB_bytes(_opb);
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_op->b_o_s=b_o_s;
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_op->e_o_s=0;
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_op->granulepos=0;
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_op->packetno=*_packet_state+3;
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return ++(*_packet_state)+3;
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}
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