| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * MatchWare Screen Capture Codec decoder | ||
| 3 | * | ||
| 4 | * Copyright (c) 2018 Paul B Mahol | ||
| 5 | * | ||
| 6 | * This file is part of FFmpeg. | ||
| 7 | * | ||
| 8 | * FFmpeg is free software; you can redistribute it and/or | ||
| 9 | * modify it under the terms of the GNU Lesser General Public | ||
| 10 | * License as published by the Free Software Foundation; either | ||
| 11 | * version 2.1 of the License, or (at your option) any later version. | ||
| 12 | * | ||
| 13 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 16 | * Lesser General Public License for more details. | ||
| 17 | * | ||
| 18 | * You should have received a copy of the GNU Lesser General Public | ||
| 19 | * License along with FFmpeg; if not, write to the Free Software | ||
| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 21 | */ | ||
| 22 | |||
| 23 | #include <stdio.h> | ||
| 24 | |||
| 25 | #include "libavutil/mem.h" | ||
| 26 | #include "avcodec.h" | ||
| 27 | #include "bytestream.h" | ||
| 28 | #include "codec_internal.h" | ||
| 29 | #include "decode.h" | ||
| 30 | #include "zlib_wrapper.h" | ||
| 31 | |||
| 32 | #include <zlib.h> | ||
| 33 | |||
| 34 | typedef struct MWSCContext { | ||
| 35 | unsigned int decomp_size; | ||
| 36 | uint8_t *decomp_buf; | ||
| 37 | AVFrame *prev_frame; | ||
| 38 | FFZStream zstream; | ||
| 39 | } MWSCContext; | ||
| 40 | |||
| 41 | ✗ | static int rle_uncompress(GetByteContext *gb, PutByteContext *pb, GetByteContext *gbp, | |
| 42 | int width, int height, int stride, int pb_linesize, int gbp_linesize) | ||
| 43 | { | ||
| 44 | ✗ | int intra = 1, w = 0; | |
| 45 | |||
| 46 | ✗ | bytestream2_seek_p(pb, (height - 1) * pb_linesize, SEEK_SET); | |
| 47 | |||
| 48 | ✗ | while (bytestream2_get_bytes_left(gb) > 0) { | |
| 49 | ✗ | uint32_t fill = bytestream2_get_le24(gb); | |
| 50 | ✗ | unsigned run = bytestream2_get_byte(gb); | |
| 51 | |||
| 52 | ✗ | if (run == 0) { | |
| 53 | ✗ | run = bytestream2_get_le32(gb); | |
| 54 | |||
| 55 | ✗ | if (bytestream2_tell_p(pb) + width - w < run) | |
| 56 | ✗ | return AVERROR_INVALIDDATA; | |
| 57 | |||
| 58 | ✗ | for (int j = 0; j < run; j++, w++) { | |
| 59 | ✗ | if (w == width) { | |
| 60 | ✗ | w = 0; | |
| 61 | ✗ | bytestream2_seek_p(pb, -(pb_linesize + stride), SEEK_CUR); | |
| 62 | } | ||
| 63 | ✗ | bytestream2_put_le24(pb, fill); | |
| 64 | } | ||
| 65 | ✗ | } else if (run == 255) { | |
| 66 | ✗ | int pos = bytestream2_tell_p(pb); | |
| 67 | |||
| 68 | ✗ | if (!gbp) | |
| 69 | ✗ | return AVERROR_INVALIDDATA; | |
| 70 | |||
| 71 | ✗ | bytestream2_seek(gbp, pos, SEEK_SET); | |
| 72 | |||
| 73 | ✗ | if (pos + width - w < fill) | |
| 74 | ✗ | return AVERROR_INVALIDDATA; | |
| 75 | |||
| 76 | ✗ | for (int j = 0; j < fill; j++, w++) { | |
| 77 | ✗ | if (w == width) { | |
| 78 | ✗ | w = 0; | |
| 79 | ✗ | bytestream2_seek_p(pb, -(pb_linesize + stride), SEEK_CUR); | |
| 80 | ✗ | bytestream2_seek(gbp, -(gbp_linesize + stride), SEEK_CUR); | |
| 81 | } | ||
| 82 | ✗ | bytestream2_put_le24(pb, bytestream2_get_le24(gbp)); | |
| 83 | } | ||
| 84 | |||
| 85 | ✗ | intra = 0; | |
| 86 | } else { | ||
| 87 | ✗ | if (bytestream2_tell_p(pb) + width - w < run) | |
| 88 | ✗ | return AVERROR_INVALIDDATA; | |
| 89 | |||
| 90 | ✗ | for (int j = 0; j < run; j++, w++) { | |
| 91 | ✗ | if (w == width) { | |
| 92 | ✗ | w = 0; | |
| 93 | ✗ | bytestream2_seek_p(pb, -(pb_linesize + stride), SEEK_CUR); | |
| 94 | } | ||
| 95 | ✗ | bytestream2_put_le24(pb, fill); | |
| 96 | } | ||
| 97 | } | ||
| 98 | } | ||
| 99 | |||
| 100 | ✗ | return intra; | |
| 101 | } | ||
| 102 | |||
| 103 | ✗ | static int decode_frame(AVCodecContext *avctx, AVFrame *frame, | |
| 104 | int *got_frame, AVPacket *avpkt) | ||
| 105 | { | ||
| 106 | ✗ | MWSCContext *s = avctx->priv_data; | |
| 107 | ✗ | z_stream *const zstream = &s->zstream.zstream; | |
| 108 | ✗ | const uint8_t *buf = avpkt->data; | |
| 109 | ✗ | int buf_size = avpkt->size; | |
| 110 | GetByteContext gb; | ||
| 111 | GetByteContext gbp; | ||
| 112 | PutByteContext pb; | ||
| 113 | int ret; | ||
| 114 | |||
| 115 | ✗ | ret = inflateReset(zstream); | |
| 116 | ✗ | if (ret != Z_OK) { | |
| 117 | ✗ | av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", ret); | |
| 118 | ✗ | return AVERROR_EXTERNAL; | |
| 119 | } | ||
| 120 | ✗ | zstream->next_in = buf; | |
| 121 | ✗ | zstream->avail_in = buf_size; | |
| 122 | ✗ | zstream->next_out = s->decomp_buf; | |
| 123 | ✗ | zstream->avail_out = s->decomp_size; | |
| 124 | ✗ | ret = inflate(zstream, Z_FINISH); | |
| 125 | ✗ | if (ret != Z_STREAM_END) { | |
| 126 | ✗ | av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", ret); | |
| 127 | ✗ | return AVERROR_EXTERNAL; | |
| 128 | } | ||
| 129 | |||
| 130 | ✗ | if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0) | |
| 131 | ✗ | return ret; | |
| 132 | |||
| 133 | ✗ | bytestream2_init(&gb, s->decomp_buf, zstream->total_out); | |
| 134 | ✗ | if (s->prev_frame->data[0]) | |
| 135 | ✗ | bytestream2_init(&gbp, s->prev_frame->data[0], avctx->height * s->prev_frame->linesize[0]); | |
| 136 | ✗ | bytestream2_init_writer(&pb, frame->data[0], avctx->height * frame->linesize[0]); | |
| 137 | |||
| 138 | ✗ | ret = rle_uncompress(&gb, &pb, s->prev_frame->data[0] ? &gbp : NULL, | |
| 139 | ✗ | avctx->width, avctx->height, avctx->width * 3, | |
| 140 | ✗ | frame->linesize[0], s->prev_frame->linesize[0]); | |
| 141 | ✗ | if (ret < 0) | |
| 142 | ✗ | return ret; | |
| 143 | ✗ | if (ret) | |
| 144 | ✗ | frame->flags |= AV_FRAME_FLAG_KEY; | |
| 145 | else | ||
| 146 | ✗ | frame->flags &= ~AV_FRAME_FLAG_KEY; | |
| 147 | |||
| 148 | ✗ | frame->pict_type = (frame->flags & AV_FRAME_FLAG_KEY) ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P; | |
| 149 | |||
| 150 | ✗ | if ((ret = av_frame_replace(s->prev_frame, frame)) < 0) | |
| 151 | ✗ | return ret; | |
| 152 | |||
| 153 | ✗ | *got_frame = 1; | |
| 154 | |||
| 155 | ✗ | return avpkt->size; | |
| 156 | } | ||
| 157 | |||
| 158 | ✗ | static av_cold int decode_init(AVCodecContext *avctx) | |
| 159 | { | ||
| 160 | ✗ | MWSCContext *s = avctx->priv_data; | |
| 161 | int64_t size; | ||
| 162 | |||
| 163 | ✗ | avctx->pix_fmt = AV_PIX_FMT_BGR24; | |
| 164 | |||
| 165 | ✗ | size = 32LL * avctx->height * avctx->width; | |
| 166 | ✗ | if (size >= INT32_MAX) | |
| 167 | ✗ | return AVERROR_INVALIDDATA; | |
| 168 | ✗ | s->decomp_size = size; | |
| 169 | ✗ | if (!(s->decomp_buf = av_malloc(s->decomp_size))) | |
| 170 | ✗ | return AVERROR(ENOMEM); | |
| 171 | |||
| 172 | ✗ | s->prev_frame = av_frame_alloc(); | |
| 173 | ✗ | if (!s->prev_frame) | |
| 174 | ✗ | return AVERROR(ENOMEM); | |
| 175 | |||
| 176 | ✗ | return ff_inflate_init(&s->zstream, avctx); | |
| 177 | } | ||
| 178 | |||
| 179 | ✗ | static av_cold int decode_close(AVCodecContext *avctx) | |
| 180 | { | ||
| 181 | ✗ | MWSCContext *s = avctx->priv_data; | |
| 182 | |||
| 183 | ✗ | av_frame_free(&s->prev_frame); | |
| 184 | ✗ | av_freep(&s->decomp_buf); | |
| 185 | ✗ | s->decomp_size = 0; | |
| 186 | ✗ | ff_inflate_end(&s->zstream); | |
| 187 | |||
| 188 | ✗ | return 0; | |
| 189 | } | ||
| 190 | |||
| 191 | const FFCodec ff_mwsc_decoder = { | ||
| 192 | .p.name = "mwsc", | ||
| 193 | CODEC_LONG_NAME("MatchWare Screen Capture Codec"), | ||
| 194 | .p.type = AVMEDIA_TYPE_VIDEO, | ||
| 195 | .p.id = AV_CODEC_ID_MWSC, | ||
| 196 | .priv_data_size = sizeof(MWSCContext), | ||
| 197 | .init = decode_init, | ||
| 198 | .close = decode_close, | ||
| 199 | FF_CODEC_DECODE_CB(decode_frame), | ||
| 200 | .p.capabilities = AV_CODEC_CAP_DR1, | ||
| 201 | .caps_internal = FF_CODEC_CAP_INIT_CLEANUP, | ||
| 202 | }; | ||
| 203 |