/* puthdr.c, generation of headers */ /* Copyright (C) 1996, MPEG Software Simulation Group. All Rights Reserved. */ /* * Disclaimer of Warranty * * These software programs are available to the user without any license fee or * royalty on an "as is" basis. The MPEG Software Simulation Group disclaims * any and all warranties, whether express, implied, or statuary, including any * implied warranties or merchantability or of fitness for a particular * purpose. In no event shall the copyright-holder be liable for any * incidental, punitive, or consequential damages of any kind whatsoever * arising from the use of these programs. * * This disclaimer of warranty extends to the user of these programs and user's * customers, employees, agents, transferees, successors, and assigns. * * The MPEG Software Simulation Group does not represent or warrant that the * programs furnished hereunder are free of infringement of any third-party * patents. * * Commercial implementations of MPEG-1 and MPEG-2 video, including shareware, * are subject to royalty fees to patent holders. Many of these patents are * general enough such that they are unavoidable regardless of implementation * design. * */ #include #include #include "config.h" #include "global.h" /* private prototypes */ static int frametotc _ANSI_ARGS_((int frame)); /* generate sequence header (6.2.2.1, 6.3.3) * * matrix download not implemented */ void putseqhdr() { int i; alignbits(); mpeg2enc_putbits(SEQ_START_CODE,32); /* sequence_header_code */ mpeg2enc_putbits(horizontal_size,12); /* horizontal_size_value */ mpeg2enc_putbits(vertical_size,12); /* vertical_size_value */ mpeg2enc_putbits(aspectratio,4); /* aspect_ratio_information */ mpeg2enc_putbits(frame_rate_code,4); /* frame_rate_code */ mpeg2enc_putbits((int)ceil(bit_rate/400.0),18); /* bit_rate_value */ mpeg2enc_putbits(1,1); /* marker_bit */ mpeg2enc_putbits(vbv_buffer_size,10); /* vbv_buffer_size_value */ mpeg2enc_putbits(constrparms,1); /* constrained_parameters_flag */ mpeg2enc_putbits(load_iquant,1); /* load_intra_quantizer_matrix */ if (load_iquant) for (i=0; i<64; i++) /* matrices are always downloaded in zig-zag order */ mpeg2enc_putbits(intra_q[mpeg2_zig_zag_scan[i]],8); /* intra_quantizer_matrix */ mpeg2enc_putbits(load_niquant,1); /* load_non_intra_quantizer_matrix */ if (load_niquant) for (i=0; i<64; i++) mpeg2enc_putbits(inter_q[mpeg2_zig_zag_scan[i]],8); /* non_intra_quantizer_matrix */ if (!mpeg1) { putseqext(); putseqdispext(); } } /* generate sequence extension (6.2.2.3, 6.3.5) header (MPEG-2 only) */ void putseqext() { alignbits(); mpeg2enc_putbits(EXT_START_CODE,32); /* extension_start_code */ mpeg2enc_putbits(SEQ_ID,4); /* extension_start_code_identifier */ mpeg2enc_putbits((profile<<4)|level,8); /* profile_and_level_indication */ mpeg2enc_putbits(prog_seq,1); /* progressive sequence */ mpeg2enc_putbits(chroma_format,2); /* chroma_format */ mpeg2enc_putbits(horizontal_size>>12,2); /* horizontal_size_extension */ mpeg2enc_putbits(vertical_size>>12,2); /* vertical_size_extension */ mpeg2enc_putbits(((int)ceil(bit_rate/400.0))>>18,12); /* bit_rate_extension */ mpeg2enc_putbits(1,1); /* marker_bit */ mpeg2enc_putbits(vbv_buffer_size>>10,8); /* vbv_buffer_size_extension */ mpeg2enc_putbits(0,1); /* low_delay -- currently not implemented */ mpeg2enc_putbits(0,2); /* frame_rate_extension_n */ mpeg2enc_putbits(0,5); /* frame_rate_extension_d */ } /* generate sequence display extension (6.2.2.4, 6.3.6) * * content not yet user setable */ void putseqdispext() { alignbits(); mpeg2enc_putbits(EXT_START_CODE,32); /* extension_start_code */ mpeg2enc_putbits(DISP_ID,4); /* extension_start_code_identifier */ mpeg2enc_putbits(video_format,3); /* video_format */ mpeg2enc_putbits(1,1); /* colour_description */ mpeg2enc_putbits(color_primaries,8); /* colour_primaries */ mpeg2enc_putbits(transfer_characteristics,8); /* transfer_characteristics */ mpeg2enc_putbits(matrix_coefficients,8); /* matrix_coefficients */ mpeg2enc_putbits(display_horizontal_size,14); /* display_horizontal_size */ mpeg2enc_putbits(1,1); /* marker_bit */ mpeg2enc_putbits(display_vertical_size,14); /* display_vertical_size */ } /* output a zero terminated string as user data (6.2.2.2.2, 6.3.4.1) * * string must not emulate start codes */ void putuserdata(userdata) char *userdata; { alignbits(); mpeg2enc_putbits(USER_START_CODE,32); /* user_data_start_code */ while (*userdata) mpeg2enc_putbits(*userdata++,8); } /* generate group of pictures header (6.2.2.6, 6.3.9) * * uses tc0 (timecode of first frame) and frame0 (number of first frame) */ void putgophdr(frame,closed_gop) int frame,closed_gop; { int tc; alignbits(); mpeg2enc_putbits(GOP_START_CODE,32); /* group_start_code */ tc = frametotc(tc0+frame); mpeg2enc_putbits(tc,25); /* time_code */ mpeg2enc_putbits(closed_gop,1); /* closed_gop */ mpeg2enc_putbits(0,1); /* broken_link */ } /* convert frame number to time_code * * drop_frame not implemented */ static int frametotc(frame) int frame; { int fps, pict, sec, minute, hour, tc; fps = (int)(frame_rate+0.5); pict = frame%fps; frame = (frame-pict)/fps; sec = frame%60; frame = (frame-sec)/60; minute = frame%60; frame = (frame-minute)/60; hour = frame%24; tc = (hour<<19) | (minute<<13) | (1<<12) | (sec<<6) | pict; return tc; } /* generate picture header (6.2.3, 6.3.10) */ void putpicthdr(pict_data_s *picture) { alignbits(); mpeg2enc_putbits(PICTURE_START_CODE,32); /* picture_start_code */ mpeg2enc_putbits(picture->temp_ref,10); /* temporal_reference */ mpeg2enc_putbits(picture->pict_type,3); /* picture_coding_type */ mpeg2enc_putbits(picture->vbv_delay,16); /* vbv_delay */ //printf("putpicthdr %d %d %d\n", picture->temp_ref, picture->pict_type, picture->vbv_delay); if (picture->pict_type==P_TYPE || picture->pict_type==B_TYPE) { mpeg2enc_putbits(0,1); /* full_pel_forward_vector */ if (mpeg1) mpeg2enc_putbits(picture->forw_hor_f_code,3); else mpeg2enc_putbits(7,3); /* forward_f_code */ } if (picture->pict_type==B_TYPE) { mpeg2enc_putbits(0,1); /* full_pel_backward_vector */ if (mpeg1) mpeg2enc_putbits(picture->back_hor_f_code,3); else mpeg2enc_putbits(7,3); /* backward_f_code */ } mpeg2enc_putbits(0,1); /* extra_bit_picture */ } /* generate picture coding extension (6.2.3.1, 6.3.11) * * composite display information (v_axis etc.) not implemented */ void putpictcodext(pict_data_s *picture) { alignbits(); mpeg2enc_putbits(EXT_START_CODE,32); /* extension_start_code */ mpeg2enc_putbits(CODING_ID,4); /* extension_start_code_identifier */ mpeg2enc_putbits(picture->forw_hor_f_code,4); /* forward_horizontal_f_code */ mpeg2enc_putbits(picture->forw_vert_f_code,4); /* forward_vertical_f_code */ mpeg2enc_putbits(picture->back_hor_f_code,4); /* backward_horizontal_f_code */ mpeg2enc_putbits(picture->back_vert_f_code,4); /* backward_vertical_f_code */ mpeg2enc_putbits(picture->dc_prec,2); /* intra_dc_precision */ mpeg2enc_putbits(picture->pict_struct,2); /* picture_structure */ mpeg2enc_putbits((picture->pict_struct==FRAME_PICTURE)?picture->topfirst:0,1); /* top_field_first */ mpeg2enc_putbits(picture->frame_pred_dct,1); /* frame_pred_frame_dct */ mpeg2enc_putbits(0,1); /* concealment_motion_vectors -- currently not implemented */ mpeg2enc_putbits(picture->q_scale_type,1); /* q_scale_type */ mpeg2enc_putbits(picture->intravlc,1); /* intra_vlc_format */ mpeg2enc_putbits(picture->altscan,1); /* alternate_scan_hv */ mpeg2enc_putbits(picture->repeatfirst,1); /* repeat_first_field */ mpeg2enc_putbits(picture->prog_frame,1); /* chroma_420_type */ mpeg2enc_putbits(picture->prog_frame,1); /* progressive_frame */ mpeg2enc_putbits(0,1); /* composite_display_flag */ } /* generate sequence_end_code (6.2.2) */ void putseqend() { alignbits(); mpeg2enc_putbits(SEQ_END_CODE,32); }