293 lines
8.9 KiB
C
293 lines
8.9 KiB
C
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/*
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* MidiVid decoder
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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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#include "libavutil/imgutils.h"
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#include "libavutil/internal.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/mem.h"
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#define BITSTREAM_READER_LE
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#include "avcodec.h"
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#include "get_bits.h"
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#include "bytestream.h"
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#include "internal.h"
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typedef struct MidiVidContext {
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GetByteContext gb;
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uint8_t *uncompressed;
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unsigned int uncompressed_size;
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uint8_t *skip;
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AVFrame *frame;
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} MidiVidContext;
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static int decode_mvdv(MidiVidContext *s, AVCodecContext *avctx, AVFrame *frame)
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{
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GetByteContext *gb = &s->gb;
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GetBitContext mask;
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GetByteContext idx9;
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uint16_t nb_vectors, intra_flag;
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const uint8_t *vec;
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const uint8_t *mask_start;
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uint8_t *skip;
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uint32_t mask_size;
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int idx9bits = 0;
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int idx9val = 0;
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uint32_t nb_blocks;
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nb_vectors = bytestream2_get_le16(gb);
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intra_flag = !!bytestream2_get_le16(gb);
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if (intra_flag) {
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nb_blocks = (avctx->width / 2) * (avctx->height / 2);
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} else {
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int ret, skip_linesize, padding;
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nb_blocks = bytestream2_get_le32(gb);
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skip_linesize = avctx->width >> 1;
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mask_start = gb->buffer_start + bytestream2_tell(gb);
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mask_size = (FFALIGN(avctx->width, 32) >> 2) * (avctx->height >> 2) >> 3;
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padding = (FFALIGN(avctx->width, 32) - avctx->width) >> 2;
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if (bytestream2_get_bytes_left(gb) < mask_size)
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return AVERROR_INVALIDDATA;
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ret = init_get_bits8(&mask, mask_start, mask_size);
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if (ret < 0)
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return ret;
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bytestream2_skip(gb, mask_size);
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skip = s->skip;
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for (int y = 0; y < avctx->height >> 2; y++) {
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for (int x = 0; x < avctx->width >> 2; x++) {
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int flag = !get_bits1(&mask);
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skip[(y*2) *skip_linesize + x*2 ] = flag;
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skip[(y*2) *skip_linesize + x*2+1] = flag;
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skip[(y*2+1)*skip_linesize + x*2 ] = flag;
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skip[(y*2+1)*skip_linesize + x*2+1] = flag;
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}
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skip_bits_long(&mask, padding);
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}
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}
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vec = gb->buffer_start + bytestream2_tell(gb);
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if (bytestream2_get_bytes_left(gb) < nb_vectors * 12)
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return AVERROR_INVALIDDATA;
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bytestream2_skip(gb, nb_vectors * 12);
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if (nb_vectors > 256) {
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if (bytestream2_get_bytes_left(gb) < (nb_blocks + 7 * !intra_flag) / 8)
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return AVERROR_INVALIDDATA;
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bytestream2_init(&idx9, gb->buffer_start + bytestream2_tell(gb), (nb_blocks + 7 * !intra_flag) / 8);
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bytestream2_skip(gb, (nb_blocks + 7 * !intra_flag) / 8);
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}
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skip = s->skip;
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for (int y = avctx->height - 2; y >= 0; y -= 2) {
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uint8_t *dsty = frame->data[0] + y * frame->linesize[0];
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uint8_t *dstu = frame->data[1] + y * frame->linesize[1];
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uint8_t *dstv = frame->data[2] + y * frame->linesize[2];
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for (int x = 0; x < avctx->width; x += 2) {
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int idx;
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if (!intra_flag && *skip++)
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continue;
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if (bytestream2_get_bytes_left(gb) <= 0)
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return AVERROR_INVALIDDATA;
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if (nb_vectors <= 256) {
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idx = bytestream2_get_byte(gb);
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} else {
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if (idx9bits == 0) {
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idx9val = bytestream2_get_byte(&idx9);
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idx9bits = 8;
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}
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idx9bits--;
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idx = bytestream2_get_byte(gb) | (((idx9val >> (7 - idx9bits)) & 1) << 8);
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}
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if (idx >= nb_vectors)
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return AVERROR_INVALIDDATA;
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dsty[x +frame->linesize[0]] = vec[idx * 12 + 0];
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dsty[x+1+frame->linesize[0]] = vec[idx * 12 + 3];
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dsty[x] = vec[idx * 12 + 6];
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dsty[x+1] = vec[idx * 12 + 9];
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dstu[x +frame->linesize[1]] = vec[idx * 12 + 1];
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dstu[x+1+frame->linesize[1]] = vec[idx * 12 + 4];
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dstu[x] = vec[idx * 12 + 7];
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dstu[x+1] = vec[idx * 12 +10];
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dstv[x +frame->linesize[2]] = vec[idx * 12 + 2];
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dstv[x+1+frame->linesize[2]] = vec[idx * 12 + 5];
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dstv[x] = vec[idx * 12 + 8];
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dstv[x+1] = vec[idx * 12 +11];
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}
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}
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return intra_flag;
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}
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static ptrdiff_t lzss_uncompress(MidiVidContext *s, GetByteContext *gb, uint8_t *dst, unsigned int size)
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{
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uint8_t *dst_start = dst;
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uint8_t *dst_end = dst + size;
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for (;bytestream2_get_bytes_left(gb) >= 3;) {
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int op = bytestream2_get_le16(gb);
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for (int i = 0; i < 16; i++) {
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if (op & 1) {
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int s0 = bytestream2_get_byte(gb);
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int s1 = bytestream2_get_byte(gb);
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int offset = ((s0 & 0xF0) << 4) | s1;
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int length = (s0 & 0xF) + 3;
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if (dst + length > dst_end ||
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dst - offset < dst_start)
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return AVERROR_INVALIDDATA;
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if (offset > 0) {
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for (int j = 0; j < length; j++) {
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dst[j] = dst[j - offset];
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}
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}
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dst += length;
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} else {
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if (dst >= dst_end)
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return AVERROR_INVALIDDATA;
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*dst++ = bytestream2_get_byte(gb);
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}
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op >>= 1;
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}
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}
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return dst - dst_start;
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}
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static int decode_frame(AVCodecContext *avctx, void *data,
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int *got_frame, AVPacket *avpkt)
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{
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MidiVidContext *s = avctx->priv_data;
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GetByteContext *gb = &s->gb;
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AVFrame *frame = s->frame;
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int ret, key, uncompressed;
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if (avpkt->size <= 13)
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return AVERROR_INVALIDDATA;
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bytestream2_init(gb, avpkt->data, avpkt->size);
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bytestream2_skip(gb, 8);
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uncompressed = bytestream2_get_le32(gb);
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if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
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return ret;
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if (uncompressed) {
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ret = decode_mvdv(s, avctx, frame);
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} else {
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av_fast_padded_malloc(&s->uncompressed, &s->uncompressed_size, 16LL * (avpkt->size - 12));
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if (!s->uncompressed)
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return AVERROR(ENOMEM);
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ret = lzss_uncompress(s, gb, s->uncompressed, s->uncompressed_size);
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if (ret < 0)
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return ret;
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bytestream2_init(gb, s->uncompressed, ret);
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ret = decode_mvdv(s, avctx, frame);
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}
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if (ret < 0)
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return ret;
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key = ret;
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if ((ret = av_frame_ref(data, s->frame)) < 0)
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return ret;
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frame->pict_type = key ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
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frame->key_frame = key;
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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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MidiVidContext *s = avctx->priv_data;
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int ret = av_image_check_size(avctx->width, avctx->height, 0, avctx);
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if (avctx->width & 3 || avctx->height & 3)
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ret = AVERROR_INVALIDDATA;
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if (ret < 0) {
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av_log(avctx, AV_LOG_ERROR, "Invalid image size %dx%d.\n",
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avctx->width, avctx->height);
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return ret;
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}
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avctx->pix_fmt = AV_PIX_FMT_YUV444P;
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s->frame = av_frame_alloc();
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if (!s->frame)
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return AVERROR(ENOMEM);
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s->skip = av_calloc(avctx->width >> 1, avctx->height >> 1);
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if (!s->skip)
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return AVERROR(ENOMEM);
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return 0;
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}
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static void decode_flush(AVCodecContext *avctx)
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{
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MidiVidContext *s = avctx->priv_data;
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av_frame_unref(s->frame);
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}
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static av_cold int decode_close(AVCodecContext *avctx)
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{
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MidiVidContext *s = avctx->priv_data;
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av_frame_free(&s->frame);
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av_freep(&s->uncompressed);
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av_freep(&s->skip);
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return 0;
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}
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AVCodec ff_mvdv_decoder = {
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.name = "mvdv",
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.long_name = NULL_IF_CONFIG_SMALL("MidiVid VQ"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_MVDV,
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.priv_data_size = sizeof(MidiVidContext),
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.init = decode_init,
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.decode = decode_frame,
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.flush = decode_flush,
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.close = decode_close,
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.capabilities = AV_CODEC_CAP_DR1,
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.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
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};
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