mirror of
https://github.com/FFmpeg/FFmpeg.git
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191 lines
6.2 KiB
C
191 lines
6.2 KiB
C
/*
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* DV decoder
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* Copyright (c) 2002 Fabrice Bellard
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* Copyright (c) 2004 Roman Shaposhnik
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*
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* DV encoder
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* Copyright (c) 2003 Roman Shaposhnik
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*
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* 50 Mbps (DVCPRO50) support
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* Copyright (c) 2006 Daniel Maas <dmaas@maasdigital.com>
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*
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* 100 Mbps (DVCPRO HD) support
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* Initial code by Daniel Maas <dmaas@maasdigital.com> (funded by BBC R&D)
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* Final code by Roman Shaposhnik
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*
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* Many thanks to Dan Dennedy <dan@dennedy.org> for providing wealth
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* of DV technical info.
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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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/**
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* @file
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* DV codec.
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*/
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#include <stdint.h>
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#include "libavutil/pixfmt.h"
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#include "dv_internal.h"
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#include "dv_profile.h"
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static inline void dv_calc_mb_coordinates(const AVDVProfile *d, int chan,
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int seq, int slot, uint16_t *tbl)
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{
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static const uint8_t off[] = { 2, 6, 8, 0, 4 };
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static const uint8_t shuf1[] = { 36, 18, 54, 0, 72 };
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static const uint8_t shuf2[] = { 24, 12, 36, 0, 48 };
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static const uint8_t shuf3[] = { 18, 9, 27, 0, 36 };
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static const uint8_t l_start[] = { 0, 4, 9, 13, 18, 22, 27, 31, 36, 40 };
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static const uint8_t l_start_shuffled[] = { 9, 4, 13, 0, 18 };
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static const uint8_t serpent1[] = {
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0, 1, 2, 2, 1, 0,
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0, 1, 2, 2, 1, 0,
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0, 1, 2, 2, 1, 0,
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0, 1, 2, 2, 1, 0,
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0, 1, 2
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};
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static const uint8_t serpent2[] = {
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0, 1, 2, 3, 4, 5, 5, 4, 3, 2, 1, 0,
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0, 1, 2, 3, 4, 5, 5, 4, 3, 2, 1, 0,
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0, 1, 2, 3, 4, 5
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};
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static const uint8_t remap[][2] = {
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{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, /* dummy */
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{ 0, 0 }, { 0, 1 }, { 0, 2 }, { 0, 3 }, { 10, 0 },
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{ 10, 1 }, { 10, 2 }, { 10, 3 }, { 20, 0 }, { 20, 1 },
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{ 20, 2 }, { 20, 3 }, { 30, 0 }, { 30, 1 }, { 30, 2 },
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{ 30, 3 }, { 40, 0 }, { 40, 1 }, { 40, 2 }, { 40, 3 },
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{ 50, 0 }, { 50, 1 }, { 50, 2 }, { 50, 3 }, { 60, 0 },
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{ 60, 1 }, { 60, 2 }, { 60, 3 }, { 70, 0 }, { 70, 1 },
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{ 70, 2 }, { 70, 3 }, { 0, 64 }, { 0, 65 }, { 0, 66 },
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{ 10, 64 }, { 10, 65 }, { 10, 66 }, { 20, 64 }, { 20, 65 },
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{ 20, 66 }, { 30, 64 }, { 30, 65 }, { 30, 66 }, { 40, 64 },
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{ 40, 65 }, { 40, 66 }, { 50, 64 }, { 50, 65 }, { 50, 66 },
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{ 60, 64 }, { 60, 65 }, { 60, 66 }, { 70, 64 }, { 70, 65 },
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{ 70, 66 }, { 0, 67 }, { 20, 67 }, { 40, 67 }, { 60, 67 }
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};
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int i, k, m;
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int x, y, blk;
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for (m = 0; m < 5; m++) {
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switch (d->width) {
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case 1440:
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blk = (chan * 11 + seq) * 27 + slot;
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if (chan == 0 && seq == 11) {
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x = m * 27 + slot;
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if (x < 90) {
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y = 0;
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} else {
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x = (x - 90) * 2;
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y = 67;
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}
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} else {
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i = (4 * chan + blk + off[m]) % 11;
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k = (blk / 11) % 27;
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x = shuf1[m] + (chan & 1) * 9 + k % 9;
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y = (i * 3 + k / 9) * 2 + (chan >> 1) + 1;
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}
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tbl[m] = (x << 1) | (y << 9);
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break;
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case 1280:
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blk = (chan * 10 + seq) * 27 + slot;
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i = (4 * chan + (seq / 5) + 2 * blk + off[m]) % 10;
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k = (blk / 5) % 27;
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x = shuf1[m] + (chan & 1) * 9 + k % 9;
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y = (i * 3 + k / 9) * 2 + (chan >> 1) + 4;
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if (x >= 80) {
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x = remap[y][0] + ((x - 80) << (y > 59));
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y = remap[y][1];
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}
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tbl[m] = (x << 1) | (y << 9);
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break;
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case 960:
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blk = (chan * 10 + seq) * 27 + slot;
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i = (4 * chan + (seq / 5) + 2 * blk + off[m]) % 10;
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k = (blk / 5) % 27 + (i & 1) * 3;
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x = shuf2[m] + k % 6 + 6 * (chan & 1);
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y = l_start[i] + k / 6 + 45 * (chan >> 1);
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tbl[m] = (x << 1) | (y << 9);
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break;
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case 720:
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switch (d->pix_fmt) {
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case AV_PIX_FMT_YUV422P:
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x = shuf3[m] + slot / 3;
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y = serpent1[slot] +
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((((seq + off[m]) % d->difseg_size) << 1) + chan) * 3;
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tbl[m] = (x << 1) | (y << 8);
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break;
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case AV_PIX_FMT_YUV420P:
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x = shuf3[m] + slot / 3;
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y = serpent1[slot] +
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((seq + off[m]) % d->difseg_size) * 3;
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tbl[m] = (x << 1) | (y << 9);
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break;
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case AV_PIX_FMT_YUV411P:
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i = (seq + off[m]) % d->difseg_size;
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k = slot + ((m == 1 || m == 2) ? 3 : 0);
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x = l_start_shuffled[m] + k / 6;
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y = serpent2[k] + i * 6;
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if (x > 21)
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y = y * 2 - i * 6;
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tbl[m] = (x << 2) | (y << 8);
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break;
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}
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default:
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break;
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}
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}
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}
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int ff_dv_init_dynamic_tables(DVwork_chunk *work_chunks, const AVDVProfile *d)
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{
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int j, i, c, s, p;
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p = i = 0;
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for (c = 0; c < d->n_difchan; c++) {
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for (s = 0; s < d->difseg_size; s++) {
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p += 6;
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for (j = 0; j < 27; j++) {
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p += !(j % 3);
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if (!(DV_PROFILE_IS_1080i50(d) && c != 0 && s == 11) &&
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!(DV_PROFILE_IS_720p50(d) && s > 9)) {
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dv_calc_mb_coordinates(d, c, s, j, &work_chunks[i].mb_coordinates[0]);
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work_chunks[i++].buf_offset = p;
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}
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p += 5;
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}
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}
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}
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return 0;
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}
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