mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-09-07 16:40:10 +02:00
477 lines
14 KiB
C
477 lines
14 KiB
C
/*
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* MagicYUV decoder
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* Copyright (c) 2016 Paul B Mahol
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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 <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "libavutil/qsort.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 "huffyuvdsp.h"
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#include "internal.h"
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#include "thread.h"
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typedef struct Slice {
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uint32_t start;
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uint32_t size;
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} Slice;
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typedef enum Prediction {
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LEFT = 1,
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GRADIENT,
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MEDIAN,
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} Prediction;
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typedef struct MagicYUVContext {
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AVFrame *p;
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int slice_height;
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int nb_slices;
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int planes; // number of encoded planes in bitstream
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int decorrelate; // postprocessing work
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int interlaced; // video is interlaced
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uint8_t *buf; // pointer to AVPacket->data
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int hshift[4];
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int vshift[4];
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Slice *slices[4]; // slice positions and size in bitstream for each plane
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int slices_size[4];
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uint8_t len[4][256]; // table of code lengths for each plane
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VLC vlc[4]; // VLC for each plane
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HuffYUVDSPContext hdsp;
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} MagicYUVContext;
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static av_cold int decode_init(AVCodecContext *avctx)
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{
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MagicYUVContext *s = avctx->priv_data;
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ff_huffyuvdsp_init(&s->hdsp);
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return 0;
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}
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typedef struct HuffEntry {
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uint8_t sym;
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uint8_t len;
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uint32_t code;
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} HuffEntry;
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static int ff_magy_huff_cmp_len(const void *a, const void *b)
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{
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const HuffEntry *aa = a, *bb = b;
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return (aa->len - bb->len) * 256 + aa->sym - bb->sym;
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}
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static int build_huff(VLC *vlc, uint8_t *len)
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{
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HuffEntry he[256];
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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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int i;
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for (i = 0; i < 256; i++) {
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he[i].sym = 255 - i;
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he[i].len = len[i];
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}
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AV_QSORT(he, 256, HuffEntry, ff_magy_huff_cmp_len);
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code = 1;
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for (i = 255; 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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ff_free_vlc(vlc);
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return ff_init_vlc_sparse(vlc, FFMIN(he[255].len, 12), 256,
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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_slice(AVCodecContext *avctx, void *tdata,
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int j, int threadnr)
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{
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MagicYUVContext *s = avctx->priv_data;
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int interlaced = s->interlaced;
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AVFrame *p = s->p;
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int i, k, x, ret;
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GetBitContext b;
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uint8_t *dst;
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for (i = 0; i < s->planes; i++) {
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int height = AV_CEIL_RSHIFT(FFMIN(s->slice_height, avctx->coded_height - j * s->slice_height), s->vshift[i]);
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int width = AV_CEIL_RSHIFT(avctx->coded_width, s->hshift[i]);
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int sheight = AV_CEIL_RSHIFT(s->slice_height, s->vshift[i]);
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int fake_stride = p->linesize[i] * (1 + interlaced);
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int stride = p->linesize[i];
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int flags, pred;
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if ((ret = init_get_bits8(&b, s->buf + s->slices[i][j].start, s->slices[i][j].size)) < 0)
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return ret;
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flags = get_bits(&b, 8);
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pred = get_bits(&b, 8);
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dst = p->data[i] + j * sheight * stride;
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if (flags & 1) {
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for (k = 0; k < height; k++) {
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for (x = 0; x < width; x++) {
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dst[x] = get_bits(&b, 8);
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}
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dst += stride;
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}
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} else {
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for (k = 0; k < height; k++) {
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for (x = 0; x < width; x++) {
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int pix;
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if (get_bits_left(&b) <= 0) {
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return AVERROR_INVALIDDATA;
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}
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pix = get_vlc2(&b, s->vlc[i].table, s->vlc[i].bits, 3);
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if (pix < 0) {
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return AVERROR_INVALIDDATA;
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}
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dst[x] = 255 - pix;
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}
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dst += stride;
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}
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}
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if (pred == LEFT) {
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dst = p->data[i] + j * sheight * stride;
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s->hdsp.add_hfyu_left_pred(dst, dst, width, 0);
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dst += stride;
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if (interlaced) {
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s->hdsp.add_hfyu_left_pred(dst, dst, width, 0);
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dst += stride;
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}
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for (k = 1 + interlaced; k < height; k++) {
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s->hdsp.add_hfyu_left_pred(dst, dst, width, dst[-fake_stride]);
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dst += stride;
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}
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} else if (pred == GRADIENT) {
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int left, lefttop, top;
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dst = p->data[i] + j * sheight * stride;
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s->hdsp.add_hfyu_left_pred(dst, dst, width, 0);
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left = lefttop = 0;
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dst += stride;
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if (interlaced) {
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s->hdsp.add_hfyu_left_pred(dst, dst, width, 0);
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left = lefttop = 0;
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dst += stride;
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}
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for (k = 1 + interlaced; k < height; k++) {
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top = dst[-fake_stride];
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left = top + dst[0];
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dst[0] = left;
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for (x = 1; x < width; x++) {
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top = dst[x - fake_stride];
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lefttop = dst[x - (fake_stride + 1)];
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left += top - lefttop + dst[x];
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dst[x] = left;
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}
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dst += stride;
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}
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} else if (pred == MEDIAN) {
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int left, lefttop;
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dst = p->data[i] + j * sheight * stride;
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lefttop = left = dst[0];
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s->hdsp.add_hfyu_left_pred(dst, dst, width, 0);
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dst += stride;
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if (interlaced) {
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lefttop = left = dst[0];
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s->hdsp.add_hfyu_left_pred(dst, dst, width, 0);
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dst += stride;
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}
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for (k = 1 + interlaced; k < height; k++) {
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s->hdsp.add_hfyu_median_pred(dst, dst - fake_stride, dst, width, &left, &lefttop);
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lefttop = left = dst[0];
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dst += stride;
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}
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} else {
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avpriv_request_sample(avctx, "unknown prediction: %d", pred);
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}
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}
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if (s->decorrelate) {
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int height = FFMIN(s->slice_height, avctx->coded_height - j * s->slice_height);
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int width = avctx->coded_width;
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uint8_t *b = p->data[0] + j * s->slice_height * p->linesize[0];
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uint8_t *g = p->data[1] + j * s->slice_height * p->linesize[1];
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uint8_t *r = p->data[2] + j * s->slice_height * p->linesize[2];
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for (i = 0; i < height; i++) {
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s->hdsp.add_bytes(b, g, width);
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s->hdsp.add_bytes(r, g, width);
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b += p->linesize[0];
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g += p->linesize[1];
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r += p->linesize[2];
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}
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}
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return 0;
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}
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static int decode_frame(AVCodecContext *avctx,
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void *data, int *got_frame,
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AVPacket *avpkt)
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{
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uint32_t first_offset, offset, next_offset, header_size, slice_width;
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int ret, format, version, table_size;
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MagicYUVContext *s = avctx->priv_data;
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ThreadFrame frame = { .f = data };
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AVFrame *p = data;
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GetByteContext gb;
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GetBitContext b;
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int i, j, k;
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bytestream2_init(&gb, avpkt->data, avpkt->size);
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if (bytestream2_get_le32(&gb) != MKTAG('M','A','G','Y'))
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return AVERROR_INVALIDDATA;
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header_size = bytestream2_get_le32(&gb);
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if (header_size < 32 || header_size >= avpkt->size)
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return AVERROR_INVALIDDATA;
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version = bytestream2_get_byte(&gb);
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if (version != 7) {
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avpriv_request_sample(avctx, "unsupported version: %d", version);
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return AVERROR_PATCHWELCOME;
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}
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s->hshift[1] = s->vshift[1] = 0;
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s->hshift[2] = s->vshift[2] = 0;
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s->decorrelate = 0;
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format = bytestream2_get_byte(&gb);
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switch (format) {
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case 0x65:
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avctx->pix_fmt = AV_PIX_FMT_GBRP;
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s->decorrelate = 1;
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s->planes = 3;
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break;
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case 0x66:
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avctx->pix_fmt = AV_PIX_FMT_GBRAP;
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s->decorrelate = 1;
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s->planes = 4;
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break;
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case 0x67:
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avctx->pix_fmt = AV_PIX_FMT_YUV444P;
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s->planes = 3;
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break;
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case 0x68:
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avctx->pix_fmt = AV_PIX_FMT_YUV422P;
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s->planes = 3;
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s->hshift[1] = s->hshift[2] = 1;
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break;
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case 0x69:
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avctx->pix_fmt = AV_PIX_FMT_YUV420P;
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s->planes = 3;
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s->hshift[1] = s->vshift[1] = 1;
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s->hshift[2] = s->vshift[2] = 1;
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break;
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case 0x6a:
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avctx->pix_fmt = AV_PIX_FMT_YUVA444P;
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s->planes = 4;
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break;
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case 0x6b:
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avctx->pix_fmt = AV_PIX_FMT_GRAY8;
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s->planes = 1;
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break;
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default:
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avpriv_request_sample(avctx, "unsupported format: 0x%X", format);
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return AVERROR_PATCHWELCOME;
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}
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bytestream2_skip(&gb, 2);
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s->interlaced = !!(bytestream2_get_byte(&gb) & 2);
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bytestream2_skip(&gb, 3);
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avctx->coded_width = bytestream2_get_le32(&gb);
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avctx->coded_height = bytestream2_get_le32(&gb);
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slice_width = bytestream2_get_le32(&gb);
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if (slice_width != avctx->coded_width) {
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avpriv_request_sample(avctx, "unsupported slice width: %d", slice_width);
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return AVERROR_PATCHWELCOME;
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}
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s->slice_height = bytestream2_get_le32(&gb);
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if ((s->slice_height <= 0) || (s->slice_height > INT_MAX - avctx->coded_height)) {
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av_log(avctx, AV_LOG_ERROR, "invalid slice height: %d\n", s->slice_height);
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return AVERROR_INVALIDDATA;
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}
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bytestream2_skip(&gb, 4);
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s->nb_slices = (avctx->coded_height + s->slice_height - 1) / s->slice_height;
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if (s->nb_slices > INT_MAX / sizeof(Slice)) {
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av_log(avctx, AV_LOG_ERROR, "invalid number of slices: %d\n", s->nb_slices);
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return AVERROR_INVALIDDATA;
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}
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for (i = 0; i < s->planes; i++) {
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av_fast_malloc(&s->slices[i], &s->slices_size[i], s->nb_slices * sizeof(Slice));
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if (!s->slices[i])
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return AVERROR(ENOMEM);
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offset = bytestream2_get_le32(&gb);
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if (offset >= avpkt->size - header_size)
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return AVERROR_INVALIDDATA;
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if (i == 0)
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first_offset = offset;
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for (j = 0; j < s->nb_slices - 1; j++) {
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s->slices[i][j].start = offset + header_size;
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next_offset = bytestream2_get_le32(&gb);
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s->slices[i][j].size = next_offset - offset;
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offset = next_offset;
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if (offset >= avpkt->size - header_size)
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return AVERROR_INVALIDDATA;
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}
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s->slices[i][j].start = offset + header_size;
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s->slices[i][j].size = avpkt->size - s->slices[i][j].start;
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}
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if (bytestream2_get_byte(&gb) != s->planes)
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return AVERROR_INVALIDDATA;
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bytestream2_skip(&gb, s->nb_slices * s->planes);
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table_size = header_size + first_offset - bytestream2_tell(&gb);
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if (table_size < 2)
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return AVERROR_INVALIDDATA;
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if ((ret = init_get_bits8(&b, avpkt->data + bytestream2_tell(&gb), table_size)) < 0)
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return ret;
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memset(s->len, 0, sizeof(s->len));
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j = i = 0;
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while (get_bits_left(&b) >= 8) {
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int l = get_bits(&b, 4);
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int x = get_bits(&b, 4);
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int L = get_bitsz(&b, l) + 1;
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for (k = 0; k < L; k++) {
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if (j + k < 256)
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s->len[i][j + k] = x;
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}
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j += L;
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if (j == 256) {
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j = 0;
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if (build_huff(&s->vlc[i], s->len[i])) {
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av_log(avctx, AV_LOG_ERROR, "Cannot build Huffman codes\n");
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return AVERROR_INVALIDDATA;
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}
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i++;
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if (i == s->planes) {
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break;
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}
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} else if (j > 256) {
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return AVERROR_INVALIDDATA;
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}
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}
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if (i != s->planes) {
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av_log(avctx, AV_LOG_ERROR, "Huffman tables too short\n");
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return AVERROR_INVALIDDATA;
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}
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p->pict_type = AV_PICTURE_TYPE_I;
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p->key_frame = 1;
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if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
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return ret;
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s->buf = avpkt->data;
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s->p = p;
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avctx->execute2(avctx, decode_slice, NULL, NULL, s->nb_slices);
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if (avctx->pix_fmt == AV_PIX_FMT_GBRP ||
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avctx->pix_fmt == AV_PIX_FMT_GBRAP) {
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FFSWAP(uint8_t*, p->data[0], p->data[1]);
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FFSWAP(int, p->linesize[0], p->linesize[1]);
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}
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*got_frame = 1;
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if (ret < 0)
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return ret;
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return avpkt->size;
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}
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#if HAVE_THREADS
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static int decode_init_thread_copy(AVCodecContext *avctx)
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{
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MagicYUVContext *s = avctx->priv_data;
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s->slices[0] = 0;
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s->slices[1] = 0;
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s->slices[2] = 0;
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s->slices[3] = 0;
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s->slices_size[0] = 0;
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s->slices_size[1] = 0;
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s->slices_size[2] = 0;
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s->slices_size[3] = 0;
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return 0;
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}
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#endif
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static av_cold int decode_end(AVCodecContext *avctx)
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{
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MagicYUVContext * const s = avctx->priv_data;
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av_freep(&s->slices[0]);
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av_freep(&s->slices[1]);
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av_freep(&s->slices[2]);
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av_freep(&s->slices[3]);
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s->slices_size[0] = 0;
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s->slices_size[1] = 0;
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s->slices_size[2] = 0;
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s->slices_size[3] = 0;
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ff_free_vlc(&s->vlc[0]);
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ff_free_vlc(&s->vlc[1]);
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ff_free_vlc(&s->vlc[2]);
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ff_free_vlc(&s->vlc[3]);
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return 0;
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}
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AVCodec ff_magicyuv_decoder = {
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.name = "magicyuv",
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.long_name = NULL_IF_CONFIG_SMALL("MagicYUV Lossless Video"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_MAGICYUV,
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.priv_data_size = sizeof(MagicYUVContext),
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.init = decode_init,
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.init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),
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.close = decode_end,
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.decode = decode_frame,
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.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS | AV_CODEC_CAP_SLICE_THREADS,
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};
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