/****************************************************************************** * * * This file is part of XviD, a free MPEG-4 video encoder/decoder * * * * XviD is an implementation of a part of one or more MPEG-4 Video tools * * as specified in ISO/IEC 14496-2 standard. Those intending to use this * * software module in hardware or software products are advised that its * * use may infringe existing patents or copyrights, and any such use * * would be at such party's own risk. The original developer of this * * software module and his/her company, and subsequent editors and their * * companies, will have no liability for use of this software or * * modifications or derivatives thereof. * * * * XviD is free software; you can redistribute it and/or modify it * * under the terms of the GNU General Public License as published by * * the Free Software Foundation; either version 2 of the License, or * * (at your option) any later version. * * * * XviD is distributed in the hope that it will be useful, but * * WITHOUT ANY WARRANTY; without even the implied warranty of * * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * * GNU General Public License for more details. * * * * You should have received a copy of the GNU General Public License * * along with this program; if not, write to the Free Software * * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * * ******************************************************************************/ /****************************************************************************** * * * bitstream.c * * * * Copyright (C) 2001 - Peter Ross * * * * For more information visit the XviD homepage: http://www.xvid.org * * * ******************************************************************************/ /****************************************************************************** * * * Revision history: * * * * 11.07.2002 add VOP width & height return to dec when dec->width * * or dec->height is 0 (for use in examples/ex1.c) * * MinChen * * 22.05.2002 bs_put_matrix fix * * 20.05.2002 added BitstreamWriteUserData * * 19.06.2002 Fix a little bug in use custom quant matrix * * MinChen * * 08.05.2002 add low_delay support for B_VOP decode * * MinChen * * 06.05.2002 low_delay * * 06.05.2002 fixed fincr/fbase error * * 01.05.2002 added BVOP support to BitstreamWriteVopHeader * * 15.04.2002 rewrite log2bin use asm386 By MinChen * * 26.03.2002 interlacing support * * 03.03.2002 qmatrix writing * * 03.03.2002 merged BITREADER and BITWRITER * * 30.02.2002 intra_dc_threshold support * * 04.12.2001 support for additional headers * * 16.12.2001 inital version * * ******************************************************************************/ #include "bitstream.h" #include "zigzag.h" #include "../quant/quant_matrix.h" static uint32_t __inline log2bin(uint32_t value) { /* Changed by Chenm001 */ #ifndef WIN32 int n = 0; while (value) { value >>= 1; n++; } return n; #else __asm { bsr eax, value inc eax } #endif } static const uint32_t intra_dc_threshold_table[] = { 32, /* never use */ 13, 15, 17, 19, 21, 23, 1, }; void bs_get_matrix(Bitstream * bs, uint8_t * matrix) { int i = 0; int last, value = 0; do { last = value; value = BitstreamGetBits(bs, 8); matrix[scan_tables[0][i++]] = value; } while (value != 0 && i < 64); i--; // fix little bug at coeff not full while (i < 64) { matrix[scan_tables[0][i++]] = last; } } // for PVOP addbits == fcode - 1 // for BVOP addbits == max(fcode,bcode) - 1 // returns mbpos int read_video_packet_header(Bitstream *bs, const int addbits, int * quant) { int nbits; int mbnum; int hec; nbits = NUMBITS_VP_RESYNC_MARKER + addbits; BitstreamSkip(bs, BitstreamNumBitsToByteAlign(bs)); BitstreamSkip(bs, nbits); DPRINTF(DPRINTF_STARTCODE, ""); // if (dec->shape != VIDOBJLAY_SHAPE_RECTANGULAR) { // hec // vop_width // marker_bit // vop_height // marker_bit //} mbnum = BitstreamGetBits(bs, 9); DPRINTF(DPRINTF_HEADER, "mbnum %i", mbnum); // if (dec->shape != VIDOBJLAY_SHAPE_BINARYONLY) *quant = BitstreamGetBits(bs, 5); DPRINTF(DPRINTF_HEADER, "quant %i", *quant); // if (dec->shape != VIDOBJLAY_SHAPE_RECTANGULAR) hec = BitstreamGetBit(bs); DPRINTF(DPRINTF_HEADER, "header_extension_code %i", hec); // if (hec) // .. decoder hec-header ... return mbnum; } /* decode headers returns coding_type, or -1 if error */ #define VIDOBJ_START_CODE_MASK 0x0000001f #define VIDOBJLAY_START_CODE_MASK 0x0000000f int BitstreamReadHeaders(Bitstream * bs, DECODER * dec, uint32_t * rounding, uint32_t * quant, uint32_t * fcode_forward, uint32_t * fcode_backward, uint32_t * intra_dc_threshold) { uint32_t vol_ver_id; static uint32_t time_increment_resolution; uint32_t coding_type; uint32_t start_code; uint32_t time_incr = 0; int32_t time_increment; do { BitstreamByteAlign(bs); start_code = BitstreamShowBits(bs, 32); if (start_code == VISOBJSEQ_START_CODE) { int profile; DPRINTF(DPRINTF_STARTCODE, ""); BitstreamSkip(bs, 32); // visual_object_sequence_start_code profile = BitstreamGetBits(bs, 8); // profile_and_level_indication DPRINTF(DPRINTF_HEADER, "profile_and_level_indication %i", profile); } else if (start_code == VISOBJSEQ_STOP_CODE) { BitstreamSkip(bs, 32); // visual_object_sequence_stop_code DPRINTF(DPRINTF_STARTCODE, ""); } else if (start_code == VISOBJ_START_CODE) { DPRINTF(DPRINTF_STARTCODE, ""); BitstreamSkip(bs, 32); // visual_object_start_code if (BitstreamGetBit(bs)) // is_visual_object_identified { vol_ver_id = BitstreamGetBits(bs, 4); // visual_object_ver_id DPRINTF(DPRINTF_HEADER,"ver_id %i", vol_ver_id); BitstreamSkip(bs, 3); // visual_object_priority } else { vol_ver_id = 1; } if (BitstreamShowBits(bs, 4) != VISOBJ_TYPE_VIDEO) // visual_object_type { DPRINTF(DPRINTF_ERROR, "visual_object_type != video"); return -1; } BitstreamSkip(bs, 4); // video_signal_type if (BitstreamGetBit(bs)) // video_signal_type { DPRINTF(DPRINTF_HEADER,"+ video_signal_type"); BitstreamSkip(bs, 3); // video_format BitstreamSkip(bs, 1); // video_range if (BitstreamGetBit(bs)) // color_description { DPRINTF(DPRINTF_HEADER,"+ color_description"); BitstreamSkip(bs, 8); // color_primaries BitstreamSkip(bs, 8); // transfer_characteristics BitstreamSkip(bs, 8); // matrix_coefficients } } } else if ((start_code & ~VIDOBJ_START_CODE_MASK) == VIDOBJ_START_CODE) { DPRINTF(DPRINTF_STARTCODE, ""); DPRINTF(DPRINTF_HEADER, "vo id %i", start_code & VIDOBJ_START_CODE_MASK); BitstreamSkip(bs, 32); // video_object_start_code } else if ((start_code & ~VIDOBJLAY_START_CODE_MASK) == VIDOBJLAY_START_CODE) { DPRINTF(DPRINTF_STARTCODE, ""); DPRINTF(DPRINTF_HEADER, "vol id %i", start_code & VIDOBJLAY_START_CODE_MASK); BitstreamSkip(bs, 32); // video_object_layer_start_code BitstreamSkip(bs, 1); // random_accessible_vol // video_object_type_indication if (BitstreamShowBits(bs, 8) != VIDOBJLAY_TYPE_SIMPLE && BitstreamShowBits(bs, 8) != VIDOBJLAY_TYPE_CORE && BitstreamShowBits(bs, 8) != VIDOBJLAY_TYPE_MAIN && BitstreamShowBits(bs, 8) != 0) // BUGGY DIVX { DPRINTF(DPRINTF_ERROR,"video_object_type_indication %i not supported ", BitstreamShowBits(bs, 8)); return -1; } BitstreamSkip(bs, 8); if (BitstreamGetBit(bs)) // is_object_layer_identifier { DPRINTF(DPRINTF_HEADER, "+ is_object_layer_identifier"); vol_ver_id = BitstreamGetBits(bs, 4); // video_object_layer_verid DPRINTF(DPRINTF_HEADER,"ver_id %i", vol_ver_id); BitstreamSkip(bs, 3); // video_object_layer_priority } else { vol_ver_id = 1; } if (BitstreamGetBits(bs, 4) == VIDOBJLAY_AR_EXTPAR) // aspect_ratio_info { DPRINTF(DPRINTF_HEADER, "+ aspect_ratio_info"); BitstreamSkip(bs, 8); // par_width BitstreamSkip(bs, 8); // par_height } if (BitstreamGetBit(bs)) // vol_control_parameters { DPRINTF(DPRINTF_HEADER, "+ vol_control_parameters"); BitstreamSkip(bs, 2); // chroma_format dec->low_delay = BitstreamGetBit(bs); // low_delay DPRINTF(DPRINTF_HEADER, "low_delay %i", dec->low_delay); if (BitstreamGetBit(bs)) // vbv_parameters { DPRINTF(DPRINTF_HEADER,"+ vbv_parameters"); BitstreamSkip(bs, 15); // first_half_bitrate READ_MARKER(); BitstreamSkip(bs, 15); // latter_half_bitrate READ_MARKER(); BitstreamSkip(bs, 15); // first_half_vbv_buffer_size READ_MARKER(); BitstreamSkip(bs, 3); // latter_half_vbv_buffer_size BitstreamSkip(bs, 11); // first_half_vbv_occupancy READ_MARKER(); BitstreamSkip(bs, 15); // latter_half_vbv_occupancy READ_MARKER(); } } dec->shape = BitstreamGetBits(bs, 2); // video_object_layer_shape DPRINTF(DPRINTF_HEADER, "shape %i", dec->shape); if (dec->shape == VIDOBJLAY_SHAPE_GRAYSCALE && vol_ver_id != 1) { BitstreamSkip(bs, 4); // video_object_layer_shape_extension } READ_MARKER(); // *************************** for decode B-frame time *********************** time_increment_resolution = BitstreamGetBits(bs, 16); // vop_time_increment_resolution DPRINTF(DPRINTF_HEADER,"vop_time_increment_resolution %i", time_increment_resolution); time_increment_resolution--; if (time_increment_resolution > 0) { dec->time_inc_bits = log2bin(time_increment_resolution); } else { // dec->time_inc_bits = 0; // for "old" xvid compatibility, set time_inc_bits = 1 dec->time_inc_bits = 1; } READ_MARKER(); if (BitstreamGetBit(bs)) // fixed_vop_rate { DPRINTF(DPRINTF_HEADER, "+ fixed_vop_rate"); BitstreamSkip(bs, dec->time_inc_bits); // fixed_vop_time_increment } if (dec->shape != VIDOBJLAY_SHAPE_BINARY_ONLY) { if (dec->shape == VIDOBJLAY_SHAPE_RECTANGULAR) { uint32_t width, height; READ_MARKER(); width = BitstreamGetBits(bs, 13); // video_object_layer_width READ_MARKER(); height = BitstreamGetBits(bs, 13); // video_object_layer_height READ_MARKER(); DPRINTF(DPRINTF_HEADER, "width %i", width); DPRINTF(DPRINTF_HEADER, "height %i", height); // for auto set width & height if (dec->width == 0) dec->width = width; if (dec->height == 0) dec->height = height; if (width != dec->width || height != dec->height) { DPRINTF(DPRINTF_ERROR, "XVID_DEC_PARAM width/height does not match bitstream"); return -1; } } dec->interlacing = BitstreamGetBit(bs); DPRINTF(DPRINTF_HEADER, "interlace", dec->interlacing); if (!BitstreamGetBit(bs)) // obmc_disable { DPRINTF(DPRINTF_ERROR, "obmc_disabled==false not supported"); // TODO // fucking divx4.02 has this enabled } if (BitstreamGetBits(bs, (vol_ver_id == 1 ? 1 : 2))) // sprite_enable { DPRINTF(DPRINTF_ERROR, "spriate_enabled not supported"); return -1; } if (vol_ver_id != 1 && dec->shape != VIDOBJLAY_SHAPE_RECTANGULAR) { BitstreamSkip(bs, 1); // sadct_disable } if (BitstreamGetBit(bs)) // not_8_bit { DPRINTF(DPRINTF_HEADER, "not_8_bit==true (ignored)"); dec->quant_bits = BitstreamGetBits(bs, 4); // quant_precision BitstreamSkip(bs, 4); // bits_per_pixel } else { dec->quant_bits = 5; } if (dec->shape == VIDOBJLAY_SHAPE_GRAYSCALE) { BitstreamSkip(bs, 1); // no_gray_quant_update BitstreamSkip(bs, 1); // composition_method BitstreamSkip(bs, 1); // linear_composition } dec->quant_type = BitstreamGetBit(bs); // quant_type DPRINTF(DPRINTF_HEADER, "quant_type %i", dec->quant_type); if (dec->quant_type) { if (BitstreamGetBit(bs)) // load_intra_quant_mat { uint8_t matrix[64]; DPRINTF(DPRINTF_HEADER, "load_intra_quant_mat"); bs_get_matrix(bs, matrix); set_intra_matrix(matrix); } else set_intra_matrix(get_default_intra_matrix()); if (BitstreamGetBit(bs)) // load_inter_quant_mat { uint8_t matrix[64]; DPRINTF(DPRINTF_HEADER, "load_inter_quant_mat"); bs_get_matrix(bs, matrix); set_inter_matrix(matrix); } else set_inter_matrix(get_default_inter_matrix()); if (dec->shape == VIDOBJLAY_SHAPE_GRAYSCALE) { DPRINTF(DPRINTF_ERROR, "greyscale matrix not supported"); return -1; } } if (vol_ver_id != 1) { dec->quarterpel = BitstreamGetBit(bs); // quarter_sampe if (dec->quarterpel) { DPRINTF(DPRINTF_ERROR, "quarter_sample not supported"); } } else { dec->quarterpel = 0; } if (!BitstreamGetBit(bs)) // complexity_estimation_disable { DPRINTF(DPRINTF_ERROR, "complexity_estimation not supported"); return -1; } BitstreamSkip(bs, 1); // resync_marker_disable if (BitstreamGetBit(bs)) // data_partitioned { DPRINTF(DPRINTF_ERROR, "data_partitioned not supported"); BitstreamSkip(bs, 1); // reversible_vlc } if (vol_ver_id != 1) { if (BitstreamGetBit(bs)) // newpred_enable { DPRINTF(DPRINTF_HEADER, "+ newpred_enable"); BitstreamSkip(bs, 2); // requested_upstream_message_type BitstreamSkip(bs, 1); // newpred_segment_type } if (BitstreamGetBit(bs)) // reduced_resolution_vop_enable { DPRINTF(DPRINTF_ERROR, "reduced_resolution_vop not supported"); return -1; } } if ((dec->scalability = BitstreamGetBit(bs))) // scalability { DPRINTF(DPRINTF_ERROR, "scalability not supported"); return -1; } } else // dec->shape == BINARY_ONLY { if (vol_ver_id != 1) { if (BitstreamGetBit(bs)) // scalability { DPRINTF(DPRINTF_ERROR, "scalability not supported"); return -1; } } BitstreamSkip(bs, 1); // resync_marker_disable } } else if (start_code == GRPOFVOP_START_CODE) { DPRINTF(DPRINTF_STARTCODE, ""); BitstreamSkip(bs, 32); { int hours, minutes, seconds; hours = BitstreamGetBits(bs, 5); minutes = BitstreamGetBits(bs, 6); READ_MARKER(); seconds = BitstreamGetBits(bs, 6); DPRINTF(DPRINTF_HEADER, "time %ih%im%is", hours); } BitstreamSkip(bs, 1); // closed_gov BitstreamSkip(bs, 1); // broken_link } else if (start_code == VOP_START_CODE) { DPRINTF(DPRINTF_STARTCODE, ""); BitstreamSkip(bs, 32); // vop_start_code coding_type = BitstreamGetBits(bs, 2); // vop_coding_type DPRINTF(DPRINTF_HEADER, "coding_type %i", coding_type); // *************************** for decode B-frame time *********************** while (BitstreamGetBit(bs) != 0) // time_base time_incr++; READ_MARKER(); if (dec->time_inc_bits) { time_increment = (BitstreamGetBits(bs, dec->time_inc_bits)); // vop_time_increment } DPRINTF(DPRINTF_HEADER, "time_base %i", time_incr); DPRINTF(DPRINTF_HEADER, "time_increment %i", time_increment); DPRINTF(DPRINTF_TIMECODE, "%c %i:%i", coding_type == I_VOP ? 'I' : coding_type == P_VOP ? 'P' : 'B', time_incr, time_increment); if (coding_type != B_VOP) { dec->last_time_base = dec->time_base; dec->time_base += time_incr; dec->time = dec->time_base * time_increment_resolution + time_increment; dec->time_pp = (uint32_t) (dec->time - dec->last_non_b_time); dec->last_non_b_time = dec->time; } else { dec->time = (dec->last_time_base + time_incr) * time_increment_resolution + time_increment; dec->time_bp = (uint32_t) (dec->last_non_b_time - dec->time); } READ_MARKER(); if (!BitstreamGetBit(bs)) // vop_coded { DPRINTF(DPRINTF_HEADER, "vop_coded==false"); return N_VOP; } /* if (newpred_enable) { } */ // fix a little bug by MinChen if ((dec->shape != VIDOBJLAY_SHAPE_BINARY_ONLY) && (coding_type == P_VOP)) { *rounding = BitstreamGetBit(bs); // rounding_type DPRINTF(DPRINTF_HEADER, "rounding %i", *rounding); } /* if (reduced_resolution_enable) { } */ if (dec->shape != VIDOBJLAY_SHAPE_RECTANGULAR) { uint32_t width, height; uint32_t horiz_mc_ref, vert_mc_ref; width = BitstreamGetBits(bs, 13); READ_MARKER(); height = BitstreamGetBits(bs, 13); READ_MARKER(); horiz_mc_ref = BitstreamGetBits(bs, 13); READ_MARKER(); vert_mc_ref = BitstreamGetBits(bs, 13); READ_MARKER(); DPRINTF(DPRINTF_HEADER, "width %i", width); DPRINTF(DPRINTF_HEADER, "height %i", height); DPRINTF(DPRINTF_HEADER, "horiz_mc_ref %i", horiz_mc_ref); DPRINTF(DPRINTF_HEADER, "vert_mc_ref %i", vert_mc_ref); BitstreamSkip(bs, 1); // change_conv_ratio_disable if (BitstreamGetBit(bs)) // vop_constant_alpha { BitstreamSkip(bs, 8); // vop_constant_alpha_value } } if (dec->shape != VIDOBJLAY_SHAPE_BINARY_ONLY) { // intra_dc_vlc_threshold *intra_dc_threshold = intra_dc_threshold_table[BitstreamGetBits(bs, 3)]; if (dec->interlacing) { dec->top_field_first = BitstreamGetBit(bs); DPRINTF(DPRINTF_HEADER, "interlace top_field_first %i", dec->top_field_first); dec->alternate_vertical_scan = BitstreamGetBit(bs); DPRINTF(DPRINTF_HEADER, "interlace alternate_vertical_scan %i", dec->alternate_vertical_scan); } } if ((*quant = BitstreamGetBits(bs, dec->quant_bits)) < 1) // vop_quant *quant = 1; DPRINTF(DPRINTF_HEADER, "quant %i", *quant); if (coding_type != I_VOP) { *fcode_forward = BitstreamGetBits(bs, 3); // fcode_forward DPRINTF(DPRINTF_HEADER, "fcode_forward %i", *fcode_forward); } if (coding_type == B_VOP) { *fcode_backward = BitstreamGetBits(bs, 3); // fcode_backward DPRINTF(DPRINTF_HEADER, "fcode_backward %i", *fcode_backward); } if (!dec->scalability) { if ((dec->shape != VIDOBJLAY_SHAPE_RECTANGULAR) && (coding_type != I_VOP)) { BitstreamSkip(bs, 1); // vop_shape_coding_type } } return coding_type; } else if (start_code == USERDATA_START_CODE) { DPRINTF(DPRINTF_STARTCODE, ""); BitstreamSkip(bs, 32); // user_data_start_code } else // start_code == ? { if (BitstreamShowBits(bs, 24) == 0x000001) { DPRINTF(DPRINTF_STARTCODE, "", BitstreamShowBits(bs, 32)); } BitstreamSkip(bs, 8); } } while ((BitstreamPos(bs) >> 3) < bs->length); //DPRINTF("*** WARNING: no vop_start_code found"); return -1; /* ignore it */ } /* write custom quant matrix */ static void bs_put_matrix(Bitstream * bs, const int16_t * matrix) { int i, j; const int last = matrix[scan_tables[0][63]]; for (j = 63; j > 0 && matrix[scan_tables[0][j - 1]] == last; j--); for (i = 0; i <= j; i++) { BitstreamPutBits(bs, matrix[scan_tables[0][i]], 8); } if (j < 63) { BitstreamPutBits(bs, 0, 8); } } /* write vol header */ void BitstreamWriteVolHeader(Bitstream * const bs, const MBParam * pParam, const FRAMEINFO * frame) { // video object_start_code & vo_id BitstreamPad(bs); BitstreamPutBits(bs, VO_START_CODE, 27); BitstreamPutBits(bs, 0, 5); // video_object_layer_start_code & vol_id BitstreamPutBits(bs, VOL_START_CODE, 28); BitstreamPutBits(bs, 0, 4); BitstreamPutBit(bs, 0); // random_accessible_vol BitstreamPutBits(bs, 0, 8); // video_object_type_indication BitstreamPutBit(bs, 0); // is_object_layer_identified (0=not given) BitstreamPutBits(bs, 1, 4); // aspect_ratio_info (1=1:1) #ifdef BFRAMES if (pParam->max_bframes > 0) { //DPRINTF("low_delay=1"); BitstreamPutBit(bs, 1); // vol_control_parameters BitstreamPutBits(bs, 1, 2); // chroma_format 1="4:2:0" BitstreamPutBit(bs, 0); // low_delay BitstreamPutBit(bs, 0); // vbv_parameters (0=not given) } else #endif { BitstreamPutBits(bs, 0, 1); // vol_control_parameters (0=not given) } BitstreamPutBits(bs, 0, 2); // video_object_layer_shape (0=rectangular) WRITE_MARKER(); /* time_increment_resolution; ignored by current decore versions eg. 2fps res=2 inc=1 25fps res=25 inc=1 29.97fps res=30000 inc=1001 */ #ifdef BFRAMES BitstreamPutBits(bs, pParam->fbase, 16); #else BitstreamPutBits(bs, 2, 16); #endif WRITE_MARKER(); #ifdef BFRAMES BitstreamPutBit(bs, 1); // fixed_vop_rate = 1 BitstreamPutBits(bs, pParam->fincr, log2bin(pParam->fbase)); // fixed_vop_time_increment #else BitstreamPutBit(bs, 0); // fixed_vop_rate = 0 #endif WRITE_MARKER(); BitstreamPutBits(bs, pParam->width, 13); // width WRITE_MARKER(); BitstreamPutBits(bs, pParam->height, 13); // height WRITE_MARKER(); BitstreamPutBit(bs, frame->global_flags & XVID_INTERLACING); // interlace BitstreamPutBit(bs, 1); // obmc_disable (overlapped block motion compensation) BitstreamPutBit(bs, 0); // sprite_enable BitstreamPutBit(bs, 0); // not_in_bit // quant_type 0=h.263 1=mpeg4(quantizer tables) BitstreamPutBit(bs, pParam->m_quant_type); if (pParam->m_quant_type) { BitstreamPutBit(bs, get_intra_matrix_status()); // load_intra_quant_mat if (get_intra_matrix_status()) { bs_put_matrix(bs, get_intra_matrix()); } BitstreamPutBit(bs, get_inter_matrix_status()); // load_inter_quant_mat if (get_inter_matrix_status()) { bs_put_matrix(bs, get_inter_matrix()); } } BitstreamPutBit(bs, 1); // complexity_estimation_disable BitstreamPutBit(bs, 1); // resync_marker_disable BitstreamPutBit(bs, 0); // data_partitioned BitstreamPutBit(bs, 0); // scalability } /* write vop header NOTE: doesnt handle bother with time_base & time_inc time_base = n seconds since last resync (eg. last iframe) time_inc = nth of a second since last resync (decoder uses these values to determine precise time since last resync) */ void BitstreamWriteVopHeader(Bitstream * const bs, const MBParam * pParam, const FRAMEINFO * frame, int vop_coded) { #ifdef BFRAMES uint32_t i; #endif BitstreamPad(bs); BitstreamPutBits(bs, VOP_START_CODE, 32); BitstreamPutBits(bs, frame->coding_type, 2); // time_base = 0 write n x PutBit(1), PutBit(0) #ifdef BFRAMES for (i = 0; i < frame->seconds; i++) { BitstreamPutBit(bs, 1); } BitstreamPutBit(bs, 0); #else BitstreamPutBits(bs, 0, 1); #endif WRITE_MARKER(); // time_increment: value=nth_of_sec, nbits = log2(resolution) #ifdef BFRAMES BitstreamPutBits(bs, frame->ticks, log2bin(pParam->fbase)); /*DPRINTF("[%i:%i] %c\n", frame->seconds, frame->ticks, frame->coding_type == I_VOP ? 'I' : frame->coding_type == P_VOP ? 'P' : 'B');*/ #else BitstreamPutBits(bs, 1, 1); #endif WRITE_MARKER(); if (!vop_coded) { BitstreamPutBits(bs, 0, 1); return; } BitstreamPutBits(bs, 1, 1); // vop_coded if (frame->coding_type == P_VOP) BitstreamPutBits(bs, frame->rounding_type, 1); BitstreamPutBits(bs, 0, 3); // intra_dc_vlc_threshold if (frame->global_flags & XVID_INTERLACING) { BitstreamPutBit(bs, 1); // top field first BitstreamPutBit(bs, 0); // alternate vertical scan } BitstreamPutBits(bs, frame->quant, 5); // quantizer if (frame->coding_type != I_VOP) BitstreamPutBits(bs, frame->fcode, 3); // forward_fixed_code if (frame->coding_type == B_VOP) BitstreamPutBits(bs, frame->bcode, 3); // backward_fixed_code } void BitstreamWriteUserData(Bitstream * const bs, uint8_t * data, const int length) { int i; BitstreamPad(bs); BitstreamPutBits(bs, USERDATA_START_CODE, 32); for (i = 0; i < length; i++) { BitstreamPutBits(bs, data[i], 8); } }