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229 lines
6.7 KiB
229 lines
6.7 KiB
/* |
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* H263 backend for ffmpeg encoder |
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* Copyright (c) 2000 Gerard Lantau. |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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*/ |
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#include <stdlib.h> |
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#include <stdio.h> |
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#include <netinet/in.h> |
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#include "common.h" |
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#include "mpegvideo.h" |
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#include "h263data.h" |
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void h263_picture_header(MpegEncContext *s, int picture_number) |
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{ |
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int format; |
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align_put_bits(&s->pb); |
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put_bits(&s->pb, 22, 0x20); |
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put_bits(&s->pb, 8, ((s->picture_number * 30) / s->frame_rate) & 0xff); |
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put_bits(&s->pb, 1, 1); /* marker */ |
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put_bits(&s->pb, 1, 0); /* h263 id */ |
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put_bits(&s->pb, 1, 0); /* split screen off */ |
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put_bits(&s->pb, 1, 0); /* camera off */ |
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put_bits(&s->pb, 1, 0); /* freeze picture release off */ |
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if (s->width == 128 && s->height == 96) |
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format = 1; |
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else if (s->width == 176 && s->height == 144) |
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format = 2; |
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else if (s->width == 352 && s->height == 288) |
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format = 3; |
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else if (s->width == 704 && s->height == 576) |
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format = 4; |
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else if (s->width == 1408 && s->height == 1152) |
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format = 5; |
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else |
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abort(); |
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put_bits(&s->pb, 3, format); |
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put_bits(&s->pb, 1, (s->pict_type == P_TYPE)); |
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put_bits(&s->pb, 1, 0); /* unrestricted motion vector: off */ |
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put_bits(&s->pb, 1, 0); /* SAC: off */ |
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put_bits(&s->pb, 1, 0); /* advanced prediction mode: off */ |
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put_bits(&s->pb, 1, 0); /* not PB frame */ |
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put_bits(&s->pb, 5, s->qscale); |
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put_bits(&s->pb, 1, 0); /* Continuous Presence Multipoint mode: off */ |
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put_bits(&s->pb, 1, 0); /* no PEI */ |
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} |
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static void h263_encode_block(MpegEncContext *s, DCTELEM *block, |
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int n); |
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void h263_encode_mb(MpegEncContext *s, |
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DCTELEM block[6][64], |
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int motion_x, int motion_y) |
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{ |
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int cbpc, cbpy, i, cbp; |
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if (!s->mb_intra) { |
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/* compute cbp */ |
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cbp = 0; |
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for(i=0;i<6;i++) { |
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if (s->block_last_index[i] >= 0) |
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cbp |= 1 << (5 - i); |
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} |
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if ((cbp | motion_x | motion_y) == 0) { |
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/* skip macroblock */ |
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put_bits(&s->pb, 1, 1); |
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return; |
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} |
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put_bits(&s->pb, 1, 0); /* mb coded */ |
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cbpc = cbp & 3; |
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put_bits(&s->pb, |
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inter_MCBPC_bits[cbpc], |
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inter_MCBPC_code[cbpc]); |
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cbpy = cbp >> 2; |
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cbpy ^= 0xf; |
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put_bits(&s->pb, cbpy_tab[cbpy][1], cbpy_tab[cbpy][0]); |
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/* motion vectors: zero */ |
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put_bits(&s->pb, 1, 1); |
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put_bits(&s->pb, 1, 1); |
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} else { |
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/* compute cbp */ |
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cbp = 0; |
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for(i=0;i<6;i++) { |
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if (s->block_last_index[i] >= 1) |
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cbp |= 1 << (5 - i); |
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} |
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cbpc = cbp & 3; |
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if (s->pict_type == I_TYPE) { |
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put_bits(&s->pb, |
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intra_MCBPC_bits[cbpc], |
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intra_MCBPC_code[cbpc]); |
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} else { |
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put_bits(&s->pb, 1, 0); /* mb coded */ |
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put_bits(&s->pb, |
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inter_MCBPC_bits[cbpc + 4], |
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inter_MCBPC_code[cbpc + 4]); |
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} |
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cbpy = cbp >> 2; |
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put_bits(&s->pb, cbpy_tab[cbpy][1], cbpy_tab[cbpy][0]); |
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} |
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/* encode each block */ |
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for(i=0;i<6;i++) { |
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h263_encode_block(s, block[i], i); |
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} |
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} |
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static void h263_encode_block(MpegEncContext *s, DCTELEM *block, int n) |
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{ |
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int level, run, last, i, j, last_index, last_non_zero, sign, alevel; |
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int code, len; |
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if (s->mb_intra) { |
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/* DC coef */ |
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level = block[0]; |
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if (level == 128) |
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put_bits(&s->pb, 8, 0xff); |
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else |
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put_bits(&s->pb, 8, level & 0xff); |
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i = 1; |
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} else { |
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i = 0; |
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} |
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/* AC coefs */ |
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last_index = s->block_last_index[n]; |
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last_non_zero = i - 1; |
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for(;i<=last_index;i++) { |
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j = zigzag_direct[i]; |
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level = block[j]; |
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if (level) { |
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run = i - last_non_zero - 1; |
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last = (i == last_index); |
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sign = 0; |
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alevel = level; |
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if (level < 0) { |
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sign = 1; |
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alevel = -level; |
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} |
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len = 0; |
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code = 0; /* only to disable warning */ |
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if (last == 0) { |
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if (run < 2 && alevel < 13 ) { |
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len = coeff_tab0[run][alevel-1][1]; |
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code = coeff_tab0[run][alevel-1][0]; |
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} else if (run >= 2 && run < 27 && alevel < 5) { |
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len = coeff_tab1[run-2][alevel-1][1]; |
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code = coeff_tab1[run-2][alevel-1][0]; |
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} |
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} else { |
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if (run < 2 && alevel < 4) { |
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len = coeff_tab2[run][alevel-1][1]; |
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code = coeff_tab2[run][alevel-1][0]; |
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} else if (run >= 2 && run < 42 && alevel == 1) { |
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len = coeff_tab3[run-2][1]; |
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code = coeff_tab3[run-2][0]; |
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} |
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} |
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if (len != 0) { |
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code = (code << 1) | sign; |
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put_bits(&s->pb, len + 1, code); |
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} else { |
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/* escape */ |
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put_bits(&s->pb, 7, 3); |
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put_bits(&s->pb, 1, last); |
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put_bits(&s->pb, 6, run); |
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put_bits(&s->pb, 8, level & 0xff); |
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} |
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last_non_zero = i; |
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} |
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} |
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} |
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/* write RV 1.0 compatible frame header */ |
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void rv10_encode_picture_header(MpegEncContext *s, int picture_number) |
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{ |
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align_put_bits(&s->pb); |
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put_bits(&s->pb, 1, 1); /* marker */ |
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put_bits(&s->pb, 1, (s->pict_type == P_TYPE)); |
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put_bits(&s->pb, 1, 0); /* not PB frame */ |
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put_bits(&s->pb, 5, s->qscale); |
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if (s->pict_type == I_TYPE) { |
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/* specific MPEG like DC coding not used */ |
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} |
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/* if multiple packets per frame are sent, the position at which |
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to display the macro blocks is coded here */ |
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put_bits(&s->pb, 6, 0); /* mb_x */ |
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put_bits(&s->pb, 6, 0); /* mb_y */ |
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put_bits(&s->pb, 12, s->mb_width * s->mb_height); |
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put_bits(&s->pb, 3, 0); /* ignored */ |
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} |
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