mirror of https://github.com/FFmpeg/FFmpeg.git
Paul B Mahol
5 years ago
parent
afee801276
commit
61dc7add30
8 changed files with 296 additions and 1 deletions
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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 skip_linesize; |
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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 = (avctx->width >> 5) * (avctx->height >> 2); |
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if (bytestream2_get_bytes_left(gb) < mask_size) |
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return AVERROR_INVALIDDATA; |
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init_get_bits8(&mask, mask_start, mask_size); |
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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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} |
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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) / 8) |
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return AVERROR_INVALIDDATA; |
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bytestream2_init(&idx9, gb->buffer_start + bytestream2_tell(gb), (nb_blocks + 7) / 8); |
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bytestream2_skip(gb, (nb_blocks + 7) / 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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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 (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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