183 lines
6.5 KiB
C
Executable file
183 lines
6.5 KiB
C
Executable file
/*
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* MPEG-4 decoder / encoder common code
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* Copyright (c) 2000,2001 Fabrice Bellard
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* Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "mpegutils.h"
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#include "mpegvideo.h"
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#include "mpeg4video.h"
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#include "mpeg4data.h"
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uint8_t ff_mpeg4_static_rl_table_store[3][2][2 * MAX_RUN + MAX_LEVEL + 3];
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int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s)
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{
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switch (s->pict_type) {
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case AV_PICTURE_TYPE_I:
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return 16;
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case AV_PICTURE_TYPE_P:
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case AV_PICTURE_TYPE_S:
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return s->f_code + 15;
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case AV_PICTURE_TYPE_B:
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return FFMAX3(s->f_code, s->b_code, 2) + 15;
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default:
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return -1;
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}
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}
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void ff_mpeg4_clean_buffers(MpegEncContext *s)
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{
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int c_wrap, c_xy, l_wrap, l_xy;
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l_wrap = s->b8_stride;
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l_xy = (2 * s->mb_y - 1) * l_wrap + s->mb_x * 2 - 1;
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c_wrap = s->mb_stride;
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c_xy = (s->mb_y - 1) * c_wrap + s->mb_x - 1;
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/* clean AC */
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memset(s->ac_val[0] + l_xy, 0, (l_wrap * 2 + 1) * 16 * sizeof(int16_t));
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memset(s->ac_val[1] + c_xy, 0, (c_wrap + 1) * 16 * sizeof(int16_t));
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memset(s->ac_val[2] + c_xy, 0, (c_wrap + 1) * 16 * sizeof(int16_t));
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/* clean MV */
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// we can't clear the MVs as they might be needed by a B-frame
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s->last_mv[0][0][0] =
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s->last_mv[0][0][1] =
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s->last_mv[1][0][0] =
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s->last_mv[1][0][1] = 0;
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}
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#define tab_size ((signed)FF_ARRAY_ELEMS(s->direct_scale_mv[0]))
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#define tab_bias (tab_size / 2)
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// used by MPEG-4 and rv10 decoder
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void ff_mpeg4_init_direct_mv(MpegEncContext *s)
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{
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int i;
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for (i = 0; i < tab_size; i++) {
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s->direct_scale_mv[0][i] = (i - tab_bias) * s->pb_time / s->pp_time;
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s->direct_scale_mv[1][i] = (i - tab_bias) * (s->pb_time - s->pp_time) /
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s->pp_time;
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}
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}
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static inline void ff_mpeg4_set_one_direct_mv(MpegEncContext *s, int mx,
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int my, int i)
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{
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int xy = s->block_index[i];
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uint16_t time_pp = s->pp_time;
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uint16_t time_pb = s->pb_time;
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int p_mx, p_my;
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p_mx = s->next_picture.motion_val[0][xy][0];
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if ((unsigned)(p_mx + tab_bias) < tab_size) {
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s->mv[0][i][0] = s->direct_scale_mv[0][p_mx + tab_bias] + mx;
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s->mv[1][i][0] = mx ? s->mv[0][i][0] - p_mx
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: s->direct_scale_mv[1][p_mx + tab_bias];
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} else {
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s->mv[0][i][0] = p_mx * time_pb / time_pp + mx;
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s->mv[1][i][0] = mx ? s->mv[0][i][0] - p_mx
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: p_mx * (time_pb - time_pp) / time_pp;
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}
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p_my = s->next_picture.motion_val[0][xy][1];
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if ((unsigned)(p_my + tab_bias) < tab_size) {
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s->mv[0][i][1] = s->direct_scale_mv[0][p_my + tab_bias] + my;
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s->mv[1][i][1] = my ? s->mv[0][i][1] - p_my
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: s->direct_scale_mv[1][p_my + tab_bias];
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} else {
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s->mv[0][i][1] = p_my * time_pb / time_pp + my;
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s->mv[1][i][1] = my ? s->mv[0][i][1] - p_my
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: p_my * (time_pb - time_pp) / time_pp;
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}
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}
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#undef tab_size
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#undef tab_bias
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/**
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* @return the mb_type
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*/
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int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my)
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{
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const int mb_index = s->mb_x + s->mb_y * s->mb_stride;
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const int colocated_mb_type = s->next_picture.mb_type[mb_index];
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uint16_t time_pp;
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uint16_t time_pb;
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int i;
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// FIXME avoid divides
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// try special case with shifts for 1 and 3 B-frames?
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if (IS_8X8(colocated_mb_type)) {
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s->mv_type = MV_TYPE_8X8;
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for (i = 0; i < 4; i++)
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ff_mpeg4_set_one_direct_mv(s, mx, my, i);
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return MB_TYPE_DIRECT2 | MB_TYPE_8x8 | MB_TYPE_L0L1;
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} else if (IS_INTERLACED(colocated_mb_type)) {
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s->mv_type = MV_TYPE_FIELD;
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for (i = 0; i < 2; i++) {
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int field_select = s->next_picture.ref_index[0][4 * mb_index + 2 * i];
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s->field_select[0][i] = field_select;
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s->field_select[1][i] = i;
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if (s->top_field_first) {
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time_pp = s->pp_field_time - field_select + i;
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time_pb = s->pb_field_time - field_select + i;
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} else {
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time_pp = s->pp_field_time + field_select - i;
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time_pb = s->pb_field_time + field_select - i;
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}
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s->mv[0][i][0] = s->p_field_mv_table[i][0][mb_index][0] *
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time_pb / time_pp + mx;
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s->mv[0][i][1] = s->p_field_mv_table[i][0][mb_index][1] *
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time_pb / time_pp + my;
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s->mv[1][i][0] = mx ? s->mv[0][i][0] -
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s->p_field_mv_table[i][0][mb_index][0]
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: s->p_field_mv_table[i][0][mb_index][0] *
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(time_pb - time_pp) / time_pp;
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s->mv[1][i][1] = my ? s->mv[0][i][1] -
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s->p_field_mv_table[i][0][mb_index][1]
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: s->p_field_mv_table[i][0][mb_index][1] *
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(time_pb - time_pp) / time_pp;
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}
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return MB_TYPE_DIRECT2 | MB_TYPE_16x8 |
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MB_TYPE_L0L1 | MB_TYPE_INTERLACED;
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} else {
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ff_mpeg4_set_one_direct_mv(s, mx, my, 0);
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s->mv[0][1][0] =
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s->mv[0][2][0] =
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s->mv[0][3][0] = s->mv[0][0][0];
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s->mv[0][1][1] =
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s->mv[0][2][1] =
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s->mv[0][3][1] = s->mv[0][0][1];
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s->mv[1][1][0] =
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s->mv[1][2][0] =
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s->mv[1][3][0] = s->mv[1][0][0];
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s->mv[1][1][1] =
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s->mv[1][2][1] =
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s->mv[1][3][1] = s->mv[1][0][1];
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if ((s->avctx->workaround_bugs & FF_BUG_DIRECT_BLOCKSIZE) ||
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!s->quarter_sample)
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s->mv_type = MV_TYPE_16X16;
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else
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s->mv_type = MV_TYPE_8X8;
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// Note see prev line
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return MB_TYPE_DIRECT2 | MB_TYPE_16x16 | MB_TYPE_L0L1;
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}
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}
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