mirror of https://github.com/FFmpeg/FFmpeg.git
Paul B Mahol
5 years ago
parent
61dc7add30
commit
ed58f8475f
9 changed files with 324 additions and 1 deletions
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/*
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* MidiVid Archive codec |
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* |
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* Copyright (c) 2019 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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#define CACHED_BITSTREAM_READER !ARCH_X86_32 |
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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 "internal.h" |
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#include "lossless_videodsp.h" |
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#include <zlib.h> |
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typedef struct MVHAContext { |
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GetBitContext gb; |
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int nb_symbols; |
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uint8_t symb[256]; |
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uint32_t prob[256]; |
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VLC vlc; |
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z_stream zstream; |
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LLVidDSPContext llviddsp; |
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} MVHAContext; |
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typedef struct Node { |
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int16_t sym; |
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int16_t n0; |
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int16_t l, r; |
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uint32_t count; |
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} Node; |
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static void get_tree_codes(uint32_t *bits, int16_t *lens, uint8_t *xlat, |
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Node *nodes, int node, |
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uint32_t pfx, int pl, int *pos) |
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{ |
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int s; |
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s = nodes[node].sym; |
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if (s != -1) { |
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bits[*pos] = (~pfx) & ((1ULL << FFMAX(pl, 1)) - 1); |
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lens[*pos] = FFMAX(pl, 1); |
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xlat[*pos] = s + (pl == 0); |
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(*pos)++; |
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} else { |
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pfx <<= 1; |
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pl++; |
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get_tree_codes(bits, lens, xlat, nodes, nodes[node].l, pfx, pl, |
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pos); |
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pfx |= 1; |
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get_tree_codes(bits, lens, xlat, nodes, nodes[node].r, pfx, pl, |
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pos); |
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} |
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} |
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static int build_vlc(AVCodecContext *avctx, VLC *vlc) |
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{ |
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MVHAContext *s = avctx->priv_data; |
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Node nodes[512]; |
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uint32_t bits[256]; |
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int16_t lens[256]; |
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uint8_t xlat[256]; |
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int cur_node, i, j, pos = 0; |
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ff_free_vlc(vlc); |
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for (i = 0; i < s->nb_symbols; i++) { |
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nodes[i].count = s->prob[i]; |
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nodes[i].sym = s->symb[i]; |
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nodes[i].n0 = -2; |
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nodes[i].l = i; |
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nodes[i].r = i; |
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} |
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cur_node = s->nb_symbols; |
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j = 0; |
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do { |
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for (i = 0; ; i++) { |
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int new_node = j; |
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int first_node = cur_node; |
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int second_node = cur_node; |
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unsigned nd, st; |
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nodes[cur_node].count = -1; |
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do { |
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int val = nodes[new_node].count; |
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if (val && (val < nodes[first_node].count)) { |
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if (val >= nodes[second_node].count) { |
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first_node = new_node; |
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} else { |
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first_node = second_node; |
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second_node = new_node; |
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} |
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} |
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new_node += 1; |
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} while (new_node != cur_node); |
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if (first_node == cur_node) |
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break; |
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nd = nodes[second_node].count; |
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st = nodes[first_node].count; |
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nodes[second_node].count = 0; |
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nodes[first_node].count = 0; |
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if (nd >= UINT32_MAX - st) { |
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av_log(avctx, AV_LOG_ERROR, "count overflow\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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nodes[cur_node].count = nd + st; |
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nodes[cur_node].sym = -1; |
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nodes[cur_node].n0 = cur_node; |
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nodes[cur_node].l = first_node; |
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nodes[cur_node].r = second_node; |
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cur_node++; |
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} |
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j++; |
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} while (cur_node - s->nb_symbols == j); |
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get_tree_codes(bits, lens, xlat, nodes, cur_node - 1, 0, 0, &pos); |
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return ff_init_vlc_sparse(vlc, 12, pos, lens, 2, 2, bits, 4, 4, xlat, 1, 1, 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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MVHAContext *s = avctx->priv_data; |
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AVFrame *frame = data; |
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uint32_t type, size; |
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int ret; |
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if (avpkt->size <= 8) |
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return AVERROR_INVALIDDATA; |
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type = AV_RB32(avpkt->data); |
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size = AV_RL32(avpkt->data + 4); |
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if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
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return ret; |
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if (type == MKTAG('L','Z','Y','V')) { |
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ret = inflateReset(&s->zstream); |
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if (ret != Z_OK) { |
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av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", ret); |
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return AVERROR_EXTERNAL; |
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} |
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s->zstream.next_in = avpkt->data + 8; |
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s->zstream.avail_in = avpkt->size - 8; |
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for (int p = 0; p < 3; p++) { |
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for (int y = 0; y < avctx->height; y++) { |
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s->zstream.next_out = frame->data[p] + (avctx->height - y - 1) * frame->linesize[p]; |
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s->zstream.avail_out = avctx->width >> (p > 0); |
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ret = inflate(&s->zstream, Z_SYNC_FLUSH); |
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if (ret != Z_OK && ret != Z_STREAM_END) { |
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av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", ret); |
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return AVERROR_EXTERNAL; |
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} |
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} |
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} |
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} else if (type == MKTAG('H','U','F','Y')) { |
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GetBitContext *gb = &s->gb; |
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int first_symbol, symbol; |
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init_get_bits8(gb, avpkt->data + 8, avpkt->size - 8); |
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skip_bits(gb, 24); |
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first_symbol = get_bits(gb, 8); |
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s->nb_symbols = get_bits(gb, 8) + 1; |
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symbol = first_symbol; |
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for (int i = 0; i < s->nb_symbols; symbol++) { |
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int prob; |
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if (get_bits1(gb)) { |
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prob = get_bits(gb, 12); |
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} else { |
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prob = get_bits(gb, 3); |
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} |
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if (prob) { |
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s->symb[i] = symbol; |
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s->prob[i] = prob; |
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i++; |
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} |
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} |
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ret = build_vlc(avctx, &s->vlc); |
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if (ret < 0) |
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return ret; |
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for (int p = 0; p < 3; p++) { |
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int width = avctx->width >> (p > 0); |
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ptrdiff_t stride = frame->linesize[p]; |
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uint8_t *dst; |
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dst = frame->data[p] + (avctx->height - 1) * frame->linesize[p]; |
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for (int y = 0; y < avctx->height; y++) { |
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for (int x = 0; x < width; x++) { |
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int v = get_vlc2(gb, s->vlc.table, s->vlc.bits, 3); |
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if (v < 0) |
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return AVERROR_INVALIDDATA; |
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dst[x] = v; |
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} |
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dst -= stride; |
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} |
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} |
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} else { |
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return AVERROR_INVALIDDATA; |
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} |
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for (int p = 0; p < 3; p++) { |
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int left, lefttop; |
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int width = avctx->width >> (p > 0); |
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ptrdiff_t stride = frame->linesize[p]; |
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uint8_t *dst; |
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dst = frame->data[p] + (avctx->height - 1) * frame->linesize[p]; |
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s->llviddsp.add_left_pred(dst, dst, width, 0); |
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dst -= stride; |
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lefttop = left = dst[0]; |
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for (int y = 1; y < avctx->height; y++) { |
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s->llviddsp.add_median_pred(dst, dst + 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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} |
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frame->pict_type = AV_PICTURE_TYPE_I; |
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frame->key_frame = 1; |
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*got_frame = 1; |
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return avpkt->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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MVHAContext *s = avctx->priv_data; |
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int zret; |
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avctx->pix_fmt = AV_PIX_FMT_YUV422P; |
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s->zstream.zalloc = Z_NULL; |
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s->zstream.zfree = Z_NULL; |
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s->zstream.opaque = Z_NULL; |
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zret = inflateInit(&s->zstream); |
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if (zret != Z_OK) { |
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av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret); |
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return AVERROR_EXTERNAL; |
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} |
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ff_llviddsp_init(&s->llviddsp); |
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return 0; |
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} |
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static av_cold int decode_close(AVCodecContext *avctx) |
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{ |
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MVHAContext *s = avctx->priv_data; |
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inflateEnd(&s->zstream); |
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ff_free_vlc(&s->vlc); |
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return 0; |
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} |
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AVCodec ff_mvha_decoder = { |
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.name = "mvha", |
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.long_name = NULL_IF_CONFIG_SMALL("MidiVid Archive Codec"), |
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.type = AVMEDIA_TYPE_VIDEO, |
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.id = AV_CODEC_ID_MVHA, |
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.priv_data_size = sizeof(MVHAContext), |
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.init = decode_init, |
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.close = decode_close, |
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.decode = decode_frame, |
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.capabilities = AV_CODEC_CAP_DR1, |
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | |
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FF_CODEC_CAP_INIT_CLEANUP, |
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}; |
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