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FFmpeg/libavcodec/dv.c
Anton Khirnov d1ba5d883e lavc/dv: remove ff_dvvideo_init()
The function contains only two assignments, setting DVVideoContext.avctx
and AVCodecContext.chroma_sample_location. However, the decoder does not
use the former, and the encoder should not be setting the latter.

Therefore move the first assignment to dvenc and the second to dvdec.
Make the encoder warn if the user-signalled chroma sample location does
not match the supported one, and return an error on higher compliance
levels.
2022-09-05 08:02:28 +02:00

187 lines
6.2 KiB
C

/*
* DV decoder
* Copyright (c) 2002 Fabrice Bellard
* Copyright (c) 2004 Roman Shaposhnik
*
* DV encoder
* Copyright (c) 2003 Roman Shaposhnik
*
* 50 Mbps (DVCPRO50) support
* Copyright (c) 2006 Daniel Maas <dmaas@maasdigital.com>
*
* 100 Mbps (DVCPRO HD) support
* Initial code by Daniel Maas <dmaas@maasdigital.com> (funded by BBC R&D)
* Final code by Roman Shaposhnik
*
* Many thanks to Dan Dennedy <dan@dennedy.org> for providing wealth
* of DV technical info.
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* DV codec.
*/
#include "avcodec.h"
#include "dv.h"
static inline void dv_calc_mb_coordinates(const AVDVProfile *d, int chan,
int seq, int slot, uint16_t *tbl)
{
static const uint8_t off[] = { 2, 6, 8, 0, 4 };
static const uint8_t shuf1[] = { 36, 18, 54, 0, 72 };
static const uint8_t shuf2[] = { 24, 12, 36, 0, 48 };
static const uint8_t shuf3[] = { 18, 9, 27, 0, 36 };
static const uint8_t l_start[] = { 0, 4, 9, 13, 18, 22, 27, 31, 36, 40 };
static const uint8_t l_start_shuffled[] = { 9, 4, 13, 0, 18 };
static const uint8_t serpent1[] = {
0, 1, 2, 2, 1, 0,
0, 1, 2, 2, 1, 0,
0, 1, 2, 2, 1, 0,
0, 1, 2, 2, 1, 0,
0, 1, 2
};
static const uint8_t serpent2[] = {
0, 1, 2, 3, 4, 5, 5, 4, 3, 2, 1, 0,
0, 1, 2, 3, 4, 5, 5, 4, 3, 2, 1, 0,
0, 1, 2, 3, 4, 5
};
static const uint8_t remap[][2] = {
{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, /* dummy */
{ 0, 0 }, { 0, 1 }, { 0, 2 }, { 0, 3 }, { 10, 0 },
{ 10, 1 }, { 10, 2 }, { 10, 3 }, { 20, 0 }, { 20, 1 },
{ 20, 2 }, { 20, 3 }, { 30, 0 }, { 30, 1 }, { 30, 2 },
{ 30, 3 }, { 40, 0 }, { 40, 1 }, { 40, 2 }, { 40, 3 },
{ 50, 0 }, { 50, 1 }, { 50, 2 }, { 50, 3 }, { 60, 0 },
{ 60, 1 }, { 60, 2 }, { 60, 3 }, { 70, 0 }, { 70, 1 },
{ 70, 2 }, { 70, 3 }, { 0, 64 }, { 0, 65 }, { 0, 66 },
{ 10, 64 }, { 10, 65 }, { 10, 66 }, { 20, 64 }, { 20, 65 },
{ 20, 66 }, { 30, 64 }, { 30, 65 }, { 30, 66 }, { 40, 64 },
{ 40, 65 }, { 40, 66 }, { 50, 64 }, { 50, 65 }, { 50, 66 },
{ 60, 64 }, { 60, 65 }, { 60, 66 }, { 70, 64 }, { 70, 65 },
{ 70, 66 }, { 0, 67 }, { 20, 67 }, { 40, 67 }, { 60, 67 }
};
int i, k, m;
int x, y, blk;
for (m = 0; m < 5; m++) {
switch (d->width) {
case 1440:
blk = (chan * 11 + seq) * 27 + slot;
if (chan == 0 && seq == 11) {
x = m * 27 + slot;
if (x < 90) {
y = 0;
} else {
x = (x - 90) * 2;
y = 67;
}
} else {
i = (4 * chan + blk + off[m]) % 11;
k = (blk / 11) % 27;
x = shuf1[m] + (chan & 1) * 9 + k % 9;
y = (i * 3 + k / 9) * 2 + (chan >> 1) + 1;
}
tbl[m] = (x << 1) | (y << 9);
break;
case 1280:
blk = (chan * 10 + seq) * 27 + slot;
i = (4 * chan + (seq / 5) + 2 * blk + off[m]) % 10;
k = (blk / 5) % 27;
x = shuf1[m] + (chan & 1) * 9 + k % 9;
y = (i * 3 + k / 9) * 2 + (chan >> 1) + 4;
if (x >= 80) {
x = remap[y][0] + ((x - 80) << (y > 59));
y = remap[y][1];
}
tbl[m] = (x << 1) | (y << 9);
break;
case 960:
blk = (chan * 10 + seq) * 27 + slot;
i = (4 * chan + (seq / 5) + 2 * blk + off[m]) % 10;
k = (blk / 5) % 27 + (i & 1) * 3;
x = shuf2[m] + k % 6 + 6 * (chan & 1);
y = l_start[i] + k / 6 + 45 * (chan >> 1);
tbl[m] = (x << 1) | (y << 9);
break;
case 720:
switch (d->pix_fmt) {
case AV_PIX_FMT_YUV422P:
x = shuf3[m] + slot / 3;
y = serpent1[slot] +
((((seq + off[m]) % d->difseg_size) << 1) + chan) * 3;
tbl[m] = (x << 1) | (y << 8);
break;
case AV_PIX_FMT_YUV420P:
x = shuf3[m] + slot / 3;
y = serpent1[slot] +
((seq + off[m]) % d->difseg_size) * 3;
tbl[m] = (x << 1) | (y << 9);
break;
case AV_PIX_FMT_YUV411P:
i = (seq + off[m]) % d->difseg_size;
k = slot + ((m == 1 || m == 2) ? 3 : 0);
x = l_start_shuffled[m] + k / 6;
y = serpent2[k] + i * 6;
if (x > 21)
y = y * 2 - i * 6;
tbl[m] = (x << 2) | (y << 8);
break;
}
default:
break;
}
}
}
int ff_dv_init_dynamic_tables(DVVideoContext *ctx, const AVDVProfile *d)
{
int j, i, c, s, p;
p = i = 0;
for (c = 0; c < d->n_difchan; c++) {
for (s = 0; s < d->difseg_size; s++) {
p += 6;
for (j = 0; j < 27; j++) {
p += !(j % 3);
if (!(DV_PROFILE_IS_1080i50(d) && c != 0 && s == 11) &&
!(DV_PROFILE_IS_720p50(d) && s > 9)) {
dv_calc_mb_coordinates(d, c, s, j, &ctx->work_chunks[i].mb_coordinates[0]);
ctx->work_chunks[i++].buf_offset = p;
}
p += 5;
}
}
}
return 0;
}