mirror of https://git.ffmpeg.org/ffmpeg.git
556 lines
18 KiB
C
556 lines
18 KiB
C
/*
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* Ut Video decoder
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* Copyright (c) 2011 Konstantin Shishkov
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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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* Ut Video decoder
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*/
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#include <stdlib.h>
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#include "libavutil/intreadwrite.h"
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#include "avcodec.h"
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#include "bytestream.h"
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#include "get_bits.h"
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#include "dsputil.h"
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#include "thread.h"
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#include "utvideo.h"
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static int build_huff(const uint8_t *src, VLC *vlc, int *fsym)
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{
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int i;
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HuffEntry he[256];
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int last;
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uint32_t codes[256];
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uint8_t bits[256];
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uint8_t syms[256];
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uint32_t code;
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*fsym = -1;
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for (i = 0; i < 256; i++) {
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he[i].sym = i;
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he[i].len = *src++;
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}
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qsort(he, 256, sizeof(*he), ff_ut_huff_cmp_len);
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if (!he[0].len) {
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*fsym = he[0].sym;
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return 0;
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}
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if (he[0].len > 32)
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return -1;
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last = 255;
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while (he[last].len == 255 && last)
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last--;
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code = 1;
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for (i = last; i >= 0; i--) {
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codes[i] = code >> (32 - he[i].len);
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bits[i] = he[i].len;
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syms[i] = he[i].sym;
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code += 0x80000000u >> (he[i].len - 1);
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}
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return ff_init_vlc_sparse(vlc, FFMIN(he[last].len, 9), last + 1,
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bits, sizeof(*bits), sizeof(*bits),
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codes, sizeof(*codes), sizeof(*codes),
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syms, sizeof(*syms), sizeof(*syms), 0);
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}
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static int decode_plane(UtvideoContext *c, int plane_no,
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uint8_t *dst, int step, int stride,
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int width, int height,
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const uint8_t *src, int use_pred)
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{
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int i, j, slice, pix;
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int sstart, send;
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VLC vlc;
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GetBitContext gb;
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int prev, fsym;
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const int cmask = ~(!plane_no && c->avctx->pix_fmt == AV_PIX_FMT_YUV420P);
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if (build_huff(src, &vlc, &fsym)) {
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av_log(c->avctx, AV_LOG_ERROR, "Cannot build Huffman codes\n");
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return AVERROR_INVALIDDATA;
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}
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if (fsym >= 0) { // build_huff reported a symbol to fill slices with
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send = 0;
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for (slice = 0; slice < c->slices; slice++) {
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uint8_t *dest;
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sstart = send;
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send = (height * (slice + 1) / c->slices) & cmask;
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dest = dst + sstart * stride;
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prev = 0x80;
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for (j = sstart; j < send; j++) {
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for (i = 0; i < width * step; i += step) {
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pix = fsym;
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if (use_pred) {
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prev += pix;
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pix = prev;
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}
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dest[i] = pix;
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}
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dest += stride;
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}
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}
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return 0;
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}
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src += 256;
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send = 0;
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for (slice = 0; slice < c->slices; slice++) {
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uint8_t *dest;
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int slice_data_start, slice_data_end, slice_size;
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sstart = send;
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send = (height * (slice + 1) / c->slices) & cmask;
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dest = dst + sstart * stride;
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// slice offset and size validation was done earlier
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slice_data_start = slice ? AV_RL32(src + slice * 4 - 4) : 0;
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slice_data_end = AV_RL32(src + slice * 4);
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slice_size = slice_data_end - slice_data_start;
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if (!slice_size) {
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av_log(c->avctx, AV_LOG_ERROR, "Plane has more than one symbol "
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"yet a slice has a length of zero.\n");
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goto fail;
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}
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memcpy(c->slice_bits, src + slice_data_start + c->slices * 4,
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slice_size);
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memset(c->slice_bits + slice_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
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c->dsp.bswap_buf((uint32_t *) c->slice_bits, (uint32_t *) c->slice_bits,
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(slice_data_end - slice_data_start + 3) >> 2);
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init_get_bits(&gb, c->slice_bits, slice_size * 8);
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prev = 0x80;
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for (j = sstart; j < send; j++) {
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for (i = 0; i < width * step; i += step) {
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if (get_bits_left(&gb) <= 0) {
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av_log(c->avctx, AV_LOG_ERROR,
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"Slice decoding ran out of bits\n");
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goto fail;
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}
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pix = get_vlc2(&gb, vlc.table, vlc.bits, 4);
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if (pix < 0) {
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av_log(c->avctx, AV_LOG_ERROR, "Decoding error\n");
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goto fail;
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}
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if (use_pred) {
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prev += pix;
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pix = prev;
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}
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dest[i] = pix;
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}
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dest += stride;
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}
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if (get_bits_left(&gb) > 32)
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av_log(c->avctx, AV_LOG_WARNING,
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"%d bits left after decoding slice\n", get_bits_left(&gb));
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}
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ff_free_vlc(&vlc);
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return 0;
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fail:
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ff_free_vlc(&vlc);
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return AVERROR_INVALIDDATA;
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}
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static void restore_rgb_planes(uint8_t *src, int step, int stride, int width,
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int height)
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{
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int i, j;
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uint8_t r, g, b;
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for (j = 0; j < height; j++) {
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for (i = 0; i < width * step; i += step) {
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r = src[i];
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g = src[i + 1];
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b = src[i + 2];
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src[i] = r + g - 0x80;
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src[i + 2] = b + g - 0x80;
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}
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src += stride;
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}
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}
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static void restore_median(uint8_t *src, int step, int stride,
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int width, int height, int slices, int rmode)
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{
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int i, j, slice;
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int A, B, C;
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uint8_t *bsrc;
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int slice_start, slice_height;
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const int cmask = ~rmode;
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for (slice = 0; slice < slices; slice++) {
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slice_start = ((slice * height) / slices) & cmask;
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slice_height = ((((slice + 1) * height) / slices) & cmask) -
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slice_start;
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bsrc = src + slice_start * stride;
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// first line - left neighbour prediction
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bsrc[0] += 0x80;
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A = bsrc[0];
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for (i = step; i < width * step; i += step) {
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bsrc[i] += A;
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A = bsrc[i];
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}
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bsrc += stride;
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if (slice_height == 1)
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continue;
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// second line - first element has top prediction, the rest uses median
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C = bsrc[-stride];
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bsrc[0] += C;
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A = bsrc[0];
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for (i = step; i < width * step; i += step) {
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B = bsrc[i - stride];
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bsrc[i] += mid_pred(A, B, (uint8_t)(A + B - C));
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C = B;
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A = bsrc[i];
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}
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bsrc += stride;
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// the rest of lines use continuous median prediction
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for (j = 2; j < slice_height; j++) {
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for (i = 0; i < width * step; i += step) {
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B = bsrc[i - stride];
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bsrc[i] += mid_pred(A, B, (uint8_t)(A + B - C));
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C = B;
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A = bsrc[i];
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}
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bsrc += stride;
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}
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}
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}
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/* UtVideo interlaced mode treats every two lines as a single one,
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* so restoring function should take care of possible padding between
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* two parts of the same "line".
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*/
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static void restore_median_il(uint8_t *src, int step, int stride,
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int width, int height, int slices, int rmode)
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{
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int i, j, slice;
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int A, B, C;
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uint8_t *bsrc;
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int slice_start, slice_height;
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const int cmask = ~(rmode ? 3 : 1);
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const int stride2 = stride << 1;
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for (slice = 0; slice < slices; slice++) {
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slice_start = ((slice * height) / slices) & cmask;
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slice_height = ((((slice + 1) * height) / slices) & cmask) -
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slice_start;
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slice_height >>= 1;
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bsrc = src + slice_start * stride;
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// first line - left neighbour prediction
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bsrc[0] += 0x80;
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A = bsrc[0];
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for (i = step; i < width * step; i += step) {
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bsrc[i] += A;
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A = bsrc[i];
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}
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for (i = 0; i < width * step; i += step) {
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bsrc[stride + i] += A;
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A = bsrc[stride + i];
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}
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bsrc += stride2;
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if (slice_height == 1)
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continue;
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// second line - first element has top prediction, the rest uses median
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C = bsrc[-stride2];
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bsrc[0] += C;
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A = bsrc[0];
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for (i = step; i < width * step; i += step) {
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B = bsrc[i - stride2];
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bsrc[i] += mid_pred(A, B, (uint8_t)(A + B - C));
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C = B;
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A = bsrc[i];
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}
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for (i = 0; i < width * step; i += step) {
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B = bsrc[i - stride];
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bsrc[stride + i] += mid_pred(A, B, (uint8_t)(A + B - C));
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C = B;
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A = bsrc[stride + i];
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}
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bsrc += stride2;
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// the rest of lines use continuous median prediction
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for (j = 2; j < slice_height; j++) {
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for (i = 0; i < width * step; i += step) {
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B = bsrc[i - stride2];
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bsrc[i] += mid_pred(A, B, (uint8_t)(A + B - C));
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C = B;
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A = bsrc[i];
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}
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for (i = 0; i < width * step; i += step) {
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B = bsrc[i - stride];
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bsrc[i + stride] += mid_pred(A, B, (uint8_t)(A + B - C));
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C = B;
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A = bsrc[i + stride];
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}
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bsrc += stride2;
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}
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}
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}
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static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
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AVPacket *avpkt)
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{
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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UtvideoContext *c = avctx->priv_data;
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int i, j;
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const uint8_t *plane_start[5];
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int plane_size, max_slice_size = 0, slice_start, slice_end, slice_size;
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int ret;
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GetByteContext gb;
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if (c->pic.data[0])
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ff_thread_release_buffer(avctx, &c->pic);
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c->pic.reference = 1;
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c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;
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if ((ret = ff_thread_get_buffer(avctx, &c->pic)) < 0) {
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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return ret;
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}
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ff_thread_finish_setup(avctx);
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/* parse plane structure to get frame flags and validate slice offsets */
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bytestream2_init(&gb, buf, buf_size);
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for (i = 0; i < c->planes; i++) {
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plane_start[i] = gb.buffer;
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if (bytestream2_get_bytes_left(&gb) < 256 + 4 * c->slices) {
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av_log(avctx, AV_LOG_ERROR, "Insufficient data for a plane\n");
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return AVERROR_INVALIDDATA;
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}
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bytestream2_skipu(&gb, 256);
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slice_start = 0;
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slice_end = 0;
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for (j = 0; j < c->slices; j++) {
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slice_end = bytestream2_get_le32u(&gb);
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slice_size = slice_end - slice_start;
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if (slice_end < 0 || slice_size < 0 ||
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bytestream2_get_bytes_left(&gb) < slice_end) {
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av_log(avctx, AV_LOG_ERROR, "Incorrect slice size\n");
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return AVERROR_INVALIDDATA;
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}
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slice_start = slice_end;
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max_slice_size = FFMAX(max_slice_size, slice_size);
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}
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plane_size = slice_end;
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bytestream2_skipu(&gb, plane_size);
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}
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plane_start[c->planes] = gb.buffer;
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if (bytestream2_get_bytes_left(&gb) < c->frame_info_size) {
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av_log(avctx, AV_LOG_ERROR, "Not enough data for frame information\n");
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return AVERROR_INVALIDDATA;
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}
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c->frame_info = bytestream2_get_le32u(&gb);
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av_log(avctx, AV_LOG_DEBUG, "frame information flags %X\n", c->frame_info);
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c->frame_pred = (c->frame_info >> 8) & 3;
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if (c->frame_pred == PRED_GRADIENT) {
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av_log_ask_for_sample(avctx, "Frame uses gradient prediction\n");
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return AVERROR_PATCHWELCOME;
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}
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av_fast_malloc(&c->slice_bits, &c->slice_bits_size,
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max_slice_size + FF_INPUT_BUFFER_PADDING_SIZE);
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if (!c->slice_bits) {
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av_log(avctx, AV_LOG_ERROR, "Cannot allocate temporary buffer\n");
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return AVERROR(ENOMEM);
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}
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switch (c->avctx->pix_fmt) {
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case AV_PIX_FMT_RGB24:
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case AV_PIX_FMT_RGBA:
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for (i = 0; i < c->planes; i++) {
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ret = decode_plane(c, i, c->pic.data[0] + ff_ut_rgb_order[i],
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c->planes, c->pic.linesize[0], avctx->width,
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avctx->height, plane_start[i],
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c->frame_pred == PRED_LEFT);
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if (ret)
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return ret;
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if (c->frame_pred == PRED_MEDIAN) {
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if (!c->interlaced) {
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restore_median(c->pic.data[0] + ff_ut_rgb_order[i],
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c->planes, c->pic.linesize[0], avctx->width,
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avctx->height, c->slices, 0);
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} else {
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restore_median_il(c->pic.data[0] + ff_ut_rgb_order[i],
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c->planes, c->pic.linesize[0],
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avctx->width, avctx->height, c->slices,
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0);
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}
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}
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}
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restore_rgb_planes(c->pic.data[0], c->planes, c->pic.linesize[0],
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avctx->width, avctx->height);
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break;
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case AV_PIX_FMT_YUV420P:
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for (i = 0; i < 3; i++) {
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ret = decode_plane(c, i, c->pic.data[i], 1, c->pic.linesize[i],
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avctx->width >> !!i, avctx->height >> !!i,
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plane_start[i], c->frame_pred == PRED_LEFT);
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if (ret)
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return ret;
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if (c->frame_pred == PRED_MEDIAN) {
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if (!c->interlaced) {
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restore_median(c->pic.data[i], 1, c->pic.linesize[i],
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avctx->width >> !!i, avctx->height >> !!i,
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c->slices, !i);
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} else {
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restore_median_il(c->pic.data[i], 1, c->pic.linesize[i],
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avctx->width >> !!i,
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avctx->height >> !!i,
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c->slices, !i);
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}
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}
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}
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break;
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case AV_PIX_FMT_YUV422P:
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for (i = 0; i < 3; i++) {
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ret = decode_plane(c, i, c->pic.data[i], 1, c->pic.linesize[i],
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avctx->width >> !!i, avctx->height,
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plane_start[i], c->frame_pred == PRED_LEFT);
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if (ret)
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return ret;
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if (c->frame_pred == PRED_MEDIAN) {
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if (!c->interlaced) {
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restore_median(c->pic.data[i], 1, c->pic.linesize[i],
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avctx->width >> !!i, avctx->height,
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c->slices, 0);
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} else {
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restore_median_il(c->pic.data[i], 1, c->pic.linesize[i],
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avctx->width >> !!i, avctx->height,
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c->slices, 0);
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}
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}
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}
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break;
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}
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c->pic.key_frame = 1;
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c->pic.pict_type = AV_PICTURE_TYPE_I;
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c->pic.interlaced_frame = !!c->interlaced;
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*got_frame = 1;
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*(AVFrame*)data = c->pic;
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/* always report that the buffer was completely consumed */
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return buf_size;
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}
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static av_cold int decode_init(AVCodecContext *avctx)
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{
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UtvideoContext * const c = avctx->priv_data;
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c->avctx = avctx;
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ff_dsputil_init(&c->dsp, avctx);
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if (avctx->extradata_size < 16) {
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av_log(avctx, AV_LOG_ERROR,
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|
"Insufficient extradata size %d, should be at least 16\n",
|
|
avctx->extradata_size);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
av_log(avctx, AV_LOG_DEBUG, "Encoder version %d.%d.%d.%d\n",
|
|
avctx->extradata[3], avctx->extradata[2],
|
|
avctx->extradata[1], avctx->extradata[0]);
|
|
av_log(avctx, AV_LOG_DEBUG, "Original format %X\n",
|
|
AV_RB32(avctx->extradata + 4));
|
|
c->frame_info_size = AV_RL32(avctx->extradata + 8);
|
|
c->flags = AV_RL32(avctx->extradata + 12);
|
|
|
|
if (c->frame_info_size != 4)
|
|
av_log_ask_for_sample(avctx, "Frame info is not 4 bytes\n");
|
|
av_log(avctx, AV_LOG_DEBUG, "Encoding parameters %08X\n", c->flags);
|
|
c->slices = (c->flags >> 24) + 1;
|
|
c->compression = c->flags & 1;
|
|
c->interlaced = c->flags & 0x800;
|
|
|
|
c->slice_bits_size = 0;
|
|
|
|
switch (avctx->codec_tag) {
|
|
case MKTAG('U', 'L', 'R', 'G'):
|
|
c->planes = 3;
|
|
avctx->pix_fmt = AV_PIX_FMT_RGB24;
|
|
break;
|
|
case MKTAG('U', 'L', 'R', 'A'):
|
|
c->planes = 4;
|
|
avctx->pix_fmt = AV_PIX_FMT_RGBA;
|
|
break;
|
|
case MKTAG('U', 'L', 'Y', '0'):
|
|
c->planes = 3;
|
|
avctx->pix_fmt = AV_PIX_FMT_YUV420P;
|
|
break;
|
|
case MKTAG('U', 'L', 'Y', '2'):
|
|
c->planes = 3;
|
|
avctx->pix_fmt = AV_PIX_FMT_YUV422P;
|
|
break;
|
|
default:
|
|
av_log(avctx, AV_LOG_ERROR, "Unknown Ut Video FOURCC provided (%08X)\n",
|
|
avctx->codec_tag);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static av_cold int decode_end(AVCodecContext *avctx)
|
|
{
|
|
UtvideoContext * const c = avctx->priv_data;
|
|
|
|
if (c->pic.data[0])
|
|
ff_thread_release_buffer(avctx, &c->pic);
|
|
|
|
av_freep(&c->slice_bits);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVCodec ff_utvideo_decoder = {
|
|
.name = "utvideo",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_UTVIDEO,
|
|
.priv_data_size = sizeof(UtvideoContext),
|
|
.init = decode_init,
|
|
.close = decode_end,
|
|
.decode = decode_frame,
|
|
.capabilities = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS,
|
|
.long_name = NULL_IF_CONFIG_SMALL("Ut Video"),
|
|
};
|