mirror of
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481 lines
14 KiB
C
481 lines
14 KiB
C
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/*
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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 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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#include <stdlib.h>
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#include <string.h>
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#include "../libavutil/pixdesc.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 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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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 bitstream positions for each plane
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unsigned int slices_size[4]; // slice sizes for each plane
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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 int 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 huff_build(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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qsort(he, 256, sizeof(HuffEntry), 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 magy_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;
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GetBitContext gb;
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uint8_t *dst;
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for (i = 0; i < s->planes; i++) {
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int left, lefttop, top;
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int height = AV_CEIL_RSHIFT(FFMIN(s->slice_height, avctx->height - j * s->slice_height), s->vshift[i]);
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int width = AV_CEIL_RSHIFT(avctx->width, s->hshift[i]);
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int sheight = AV_CEIL_RSHIFT(s->slice_height, s->vshift[i]);
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ptrdiff_t fake_stride = p->linesize[i] * (1 + interlaced);
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ptrdiff_t stride = p->linesize[i];
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int flags, pred;
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int ret = init_get_bits8(&gb, s->buf + s->slices[i][j].start,
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s->slices[i][j].size);
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if (ret < 0)
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return ret;
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flags = get_bits(&gb, 8);
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pred = get_bits(&gb, 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(&gb, 8);
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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(&gb) <= 0)
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return AVERROR_INVALIDDATA;
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pix = get_vlc2(&gb, 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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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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switch (pred) {
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case 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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break;
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case GRADIENT:
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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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break;
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case MEDIAN:
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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,
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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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break;
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default:
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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->height - j * s->slice_height);
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int width = avctx->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 magy_decode_frame(AVCodecContext *avctx, void *data,
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int *got_frame, AVPacket *avpkt)
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{
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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 gbyte;
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GetBitContext gbit;
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uint32_t first_offset, offset, next_offset, header_size, slice_width;
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int width, height, format, version, table_size;
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int ret, i, j, k;
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bytestream2_init(&gbyte, avpkt->data, avpkt->size);
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if (bytestream2_get_le32(&gbyte) != MKTAG('M', 'A', 'G', 'Y'))
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return AVERROR_INVALIDDATA;
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header_size = bytestream2_get_le32(&gbyte);
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if (header_size < 32 || header_size >= avpkt->size) {
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av_log(avctx, AV_LOG_ERROR,
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"header or packet too small %"PRIu32"\n", header_size);
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return AVERROR_INVALIDDATA;
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}
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version = bytestream2_get_byte(&gbyte);
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if (version != 7) {
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avpriv_request_sample(avctx, "Version %d", version);
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return AVERROR_PATCHWELCOME;
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}
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s->hshift[1] =
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s->vshift[1] =
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s->hshift[2] =
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s->vshift[2] = 0;
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s->decorrelate = 0;
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format = bytestream2_get_byte(&gbyte);
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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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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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break;
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case 0x67:
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avctx->pix_fmt = AV_PIX_FMT_YUV444P;
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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->hshift[1] =
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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->hshift[1] =
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s->vshift[1] =
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s->hshift[2] =
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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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break;
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case 0x6b:
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avctx->pix_fmt = AV_PIX_FMT_GRAY8;
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break;
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default:
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avpriv_request_sample(avctx, "Format 0x%X", format);
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return AVERROR_PATCHWELCOME;
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}
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s->planes = av_pix_fmt_count_planes(avctx->pix_fmt);
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bytestream2_skip(&gbyte, 2);
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s->interlaced = !!(bytestream2_get_byte(&gbyte) & 2);
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bytestream2_skip(&gbyte, 3);
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width = bytestream2_get_le32(&gbyte);
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height = bytestream2_get_le32(&gbyte);
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ret = ff_set_dimensions(avctx, width, height);
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if (ret < 0)
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return ret;
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slice_width = bytestream2_get_le32(&gbyte);
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if (slice_width != width) {
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avpriv_request_sample(avctx, "Slice width %"PRIu32, slice_width);
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return AVERROR_PATCHWELCOME;
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}
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s->slice_height = bytestream2_get_le32(&gbyte);
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if (s->slice_height <= 0 || s->slice_height > INT_MAX - height) {
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av_log(avctx, AV_LOG_ERROR,
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"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(&gbyte, 4);
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s->nb_slices = (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,
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"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(&gbyte);
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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(&gbyte);
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if (next_offset <= offset || next_offset >= avpkt->size - header_size)
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return AVERROR_INVALIDDATA;
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s->slices[i][j].size = next_offset - offset;
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offset = next_offset;
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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(&gbyte) != s->planes)
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return AVERROR_INVALIDDATA;
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bytestream2_skip(&gbyte, s->nb_slices * s->planes);
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table_size = header_size + first_offset - bytestream2_tell(&gbyte);
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if (table_size < 2)
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return AVERROR_INVALIDDATA;
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ret = init_get_bits8(&gbit, avpkt->data + bytestream2_tell(&gbyte), table_size);
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if (ret < 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(&gbit) >= 8) {
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int b = get_bits(&gbit, 4);
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int x = get_bits(&gbit, 4);
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int l = get_bitsz(&gbit, b) + 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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j += l;
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if (j == 256) {
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j = 0;
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if (huff_build(&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)
|
||
|
return ret;
|
||
|
|
||
|
s->buf = avpkt->data;
|
||
|
s->p = p;
|
||
|
avctx->execute2(avctx, magy_decode_slice, NULL, NULL, s->nb_slices);
|
||
|
|
||
|
if (avctx->pix_fmt == AV_PIX_FMT_GBRP ||
|
||
|
avctx->pix_fmt == AV_PIX_FMT_GBRAP) {
|
||
|
FFSWAP(uint8_t*, p->data[0], p->data[1]);
|
||
|
FFSWAP(int, p->linesize[0], p->linesize[1]);
|
||
|
}
|
||
|
|
||
|
*got_frame = 1;
|
||
|
|
||
|
return avpkt->size;
|
||
|
}
|
||
|
|
||
|
#if HAVE_THREADS
|
||
|
static int magy_init_thread_copy(AVCodecContext *avctx)
|
||
|
{
|
||
|
MagicYUVContext *s = avctx->priv_data;
|
||
|
int i;
|
||
|
|
||
|
for (i = 0; i < FF_ARRAY_ELEMS(s->slices); i++) {
|
||
|
s->slices[i] = NULL;
|
||
|
s->slices_size[i] = 0;
|
||
|
}
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
#endif
|
||
|
|
||
|
static av_cold int magy_decode_init(AVCodecContext *avctx)
|
||
|
{
|
||
|
MagicYUVContext *s = avctx->priv_data;
|
||
|
ff_huffyuvdsp_init(&s->hdsp);
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static av_cold int magy_decode_end(AVCodecContext *avctx)
|
||
|
{
|
||
|
MagicYUVContext * const s = avctx->priv_data;
|
||
|
int i;
|
||
|
|
||
|
for (i = 0; i < FF_ARRAY_ELEMS(s->slices); i++) {
|
||
|
av_freep(&s->slices[i]);
|
||
|
s->slices_size[i] = 0;
|
||
|
ff_free_vlc(&s->vlc[i]);
|
||
|
}
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
AVCodec ff_magicyuv_decoder = {
|
||
|
.name = "magicyuv",
|
||
|
.long_name = NULL_IF_CONFIG_SMALL("MagicYUV video"),
|
||
|
.type = AVMEDIA_TYPE_VIDEO,
|
||
|
.id = AV_CODEC_ID_MAGICYUV,
|
||
|
.priv_data_size = sizeof(MagicYUVContext),
|
||
|
.init = magy_decode_init,
|
||
|
.init_thread_copy = ONLY_IF_THREADS_ENABLED(magy_init_thread_copy),
|
||
|
.close = magy_decode_end,
|
||
|
.decode = magy_decode_frame,
|
||
|
.capabilities = AV_CODEC_CAP_DR1 |
|
||
|
AV_CODEC_CAP_FRAME_THREADS |
|
||
|
AV_CODEC_CAP_SLICE_THREADS,
|
||
|
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
|
||
|
};
|