| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * WinCAM Motion Video 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/imgutils.h" | ||
| 26 | |||
| 27 | #include "avcodec.h" | ||
| 28 | #include "bytestream.h" | ||
| 29 | #include "codec_internal.h" | ||
| 30 | #include "decode.h" | ||
| 31 | #include "zlib_wrapper.h" | ||
| 32 | |||
| 33 | #include <zlib.h> | ||
| 34 | |||
| 35 | typedef struct WCMVContext { | ||
| 36 | int bpp; | ||
| 37 | FFZStream zstream; | ||
| 38 | AVFrame *prev_frame; | ||
| 39 | uint8_t block_data[65536*8]; | ||
| 40 | } WCMVContext; | ||
| 41 | |||
| 42 | ✗ | static int decode_frame(AVCodecContext *avctx, AVFrame *frame, | |
| 43 | int *got_frame, AVPacket *avpkt) | ||
| 44 | { | ||
| 45 | ✗ | WCMVContext *s = avctx->priv_data; | |
| 46 | ✗ | z_stream *const zstream = &s->zstream.zstream; | |
| 47 | ✗ | int skip, blocks, zret, ret, intra = 0, flags = 0, bpp = s->bpp; | |
| 48 | GetByteContext gb; | ||
| 49 | uint8_t *dst; | ||
| 50 | |||
| 51 | ✗ | ret = inflateReset(zstream); | |
| 52 | ✗ | if (ret != Z_OK) { | |
| 53 | ✗ | av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", ret); | |
| 54 | ✗ | return AVERROR_EXTERNAL; | |
| 55 | } | ||
| 56 | |||
| 57 | ✗ | bytestream2_init(&gb, avpkt->data, avpkt->size); | |
| 58 | ✗ | blocks = bytestream2_get_le16(&gb); | |
| 59 | ✗ | if (!blocks) | |
| 60 | ✗ | flags |= FF_REGET_BUFFER_FLAG_READONLY; | |
| 61 | |||
| 62 | ✗ | if ((ret = ff_reget_buffer(avctx, s->prev_frame, flags)) < 0) | |
| 63 | ✗ | return ret; | |
| 64 | |||
| 65 | ✗ | if (blocks > 5) { | |
| 66 | GetByteContext bgb; | ||
| 67 | ✗ | int x = 0, size; | |
| 68 | |||
| 69 | ✗ | if (blocks * 8 >= 0xFFFF) | |
| 70 | ✗ | size = bytestream2_get_le24(&gb); | |
| 71 | ✗ | else if (blocks * 8 >= 0xFF) | |
| 72 | ✗ | size = bytestream2_get_le16(&gb); | |
| 73 | else | ||
| 74 | ✗ | size = bytestream2_get_byte(&gb); | |
| 75 | |||
| 76 | ✗ | skip = bytestream2_tell(&gb); | |
| 77 | ✗ | if (size > avpkt->size - skip) | |
| 78 | ✗ | return AVERROR_INVALIDDATA; | |
| 79 | |||
| 80 | ✗ | zstream->next_in = avpkt->data + skip; | |
| 81 | ✗ | zstream->avail_in = size; | |
| 82 | ✗ | zstream->next_out = s->block_data; | |
| 83 | ✗ | zstream->avail_out = sizeof(s->block_data); | |
| 84 | |||
| 85 | ✗ | zret = inflate(zstream, Z_FINISH); | |
| 86 | ✗ | if (zret != Z_STREAM_END) { | |
| 87 | ✗ | av_log(avctx, AV_LOG_ERROR, | |
| 88 | "Inflate failed with return code: %d.\n", zret); | ||
| 89 | ✗ | return AVERROR_INVALIDDATA; | |
| 90 | } | ||
| 91 | |||
| 92 | ✗ | ret = inflateReset(zstream); | |
| 93 | ✗ | if (ret != Z_OK) { | |
| 94 | ✗ | av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", ret); | |
| 95 | ✗ | return AVERROR_EXTERNAL; | |
| 96 | } | ||
| 97 | |||
| 98 | ✗ | bytestream2_skip(&gb, size); | |
| 99 | ✗ | bytestream2_init(&bgb, s->block_data, blocks * 8); | |
| 100 | |||
| 101 | ✗ | for (int i = 0; i < blocks; i++) { | |
| 102 | int w, h; | ||
| 103 | |||
| 104 | ✗ | bytestream2_skip(&bgb, 4); | |
| 105 | ✗ | w = bytestream2_get_le16(&bgb); | |
| 106 | ✗ | h = bytestream2_get_le16(&bgb); | |
| 107 | ✗ | if (x + bpp * (int64_t)w * h > INT_MAX) | |
| 108 | ✗ | return AVERROR_INVALIDDATA; | |
| 109 | ✗ | x += bpp * w * h; | |
| 110 | } | ||
| 111 | |||
| 112 | ✗ | if (x >= 0xFFFF) | |
| 113 | ✗ | bytestream2_skip(&gb, 3); | |
| 114 | ✗ | else if (x >= 0xFF) | |
| 115 | ✗ | bytestream2_skip(&gb, 2); | |
| 116 | else | ||
| 117 | ✗ | bytestream2_skip(&gb, 1); | |
| 118 | |||
| 119 | ✗ | skip = bytestream2_tell(&gb); | |
| 120 | |||
| 121 | ✗ | zstream->next_in = avpkt->data + skip; | |
| 122 | ✗ | zstream->avail_in = avpkt->size - skip; | |
| 123 | |||
| 124 | ✗ | bytestream2_init(&gb, s->block_data, blocks * 8); | |
| 125 | ✗ | } else if (blocks) { | |
| 126 | ✗ | int x = 0; | |
| 127 | |||
| 128 | ✗ | bytestream2_seek(&gb, 2, SEEK_SET); | |
| 129 | |||
| 130 | ✗ | for (int i = 0; i < blocks; i++) { | |
| 131 | int w, h; | ||
| 132 | |||
| 133 | ✗ | bytestream2_skip(&gb, 4); | |
| 134 | ✗ | w = bytestream2_get_le16(&gb); | |
| 135 | ✗ | h = bytestream2_get_le16(&gb); | |
| 136 | ✗ | if (x + bpp * (int64_t)w * h > INT_MAX) | |
| 137 | ✗ | return AVERROR_INVALIDDATA; | |
| 138 | ✗ | x += bpp * w * h; | |
| 139 | } | ||
| 140 | |||
| 141 | ✗ | if (x >= 0xFFFF) | |
| 142 | ✗ | bytestream2_skip(&gb, 3); | |
| 143 | ✗ | else if (x >= 0xFF) | |
| 144 | ✗ | bytestream2_skip(&gb, 2); | |
| 145 | else | ||
| 146 | ✗ | bytestream2_skip(&gb, 1); | |
| 147 | |||
| 148 | ✗ | skip = bytestream2_tell(&gb); | |
| 149 | |||
| 150 | ✗ | zstream->next_in = avpkt->data + skip; | |
| 151 | ✗ | zstream->avail_in = avpkt->size - skip; | |
| 152 | |||
| 153 | ✗ | bytestream2_seek(&gb, 2, SEEK_SET); | |
| 154 | } | ||
| 155 | |||
| 156 | ✗ | if (bytestream2_get_bytes_left(&gb) < 8LL * blocks) | |
| 157 | ✗ | return AVERROR_INVALIDDATA; | |
| 158 | |||
| 159 | ✗ | if (!avctx->frame_num) { | |
| 160 | ✗ | ptrdiff_t linesize[4] = { s->prev_frame->linesize[0], 0, 0, 0 }; | |
| 161 | ✗ | av_image_fill_black(s->prev_frame->data, linesize, avctx->pix_fmt, 0, | |
| 162 | avctx->width, avctx->height); | ||
| 163 | } | ||
| 164 | |||
| 165 | ✗ | for (int block = 0; block < blocks; block++) { | |
| 166 | int x, y, w, h; | ||
| 167 | |||
| 168 | ✗ | x = bytestream2_get_le16(&gb); | |
| 169 | ✗ | y = bytestream2_get_le16(&gb); | |
| 170 | ✗ | w = bytestream2_get_le16(&gb); | |
| 171 | ✗ | h = bytestream2_get_le16(&gb); | |
| 172 | |||
| 173 | ✗ | if (blocks == 1 && x == 0 && y == 0 && w == avctx->width && h == avctx->height) | |
| 174 | ✗ | intra = 1; | |
| 175 | |||
| 176 | ✗ | if (x + w > avctx->width || y + h > avctx->height) | |
| 177 | ✗ | return AVERROR_INVALIDDATA; | |
| 178 | |||
| 179 | ✗ | if (w > avctx->width || h > avctx->height) | |
| 180 | ✗ | return AVERROR_INVALIDDATA; | |
| 181 | |||
| 182 | ✗ | dst = s->prev_frame->data[0] + (avctx->height - y - 1) * s->prev_frame->linesize[0] + x * bpp; | |
| 183 | ✗ | for (int i = 0; i < h; i++) { | |
| 184 | ✗ | zstream->next_out = dst; | |
| 185 | ✗ | zstream->avail_out = w * bpp; | |
| 186 | |||
| 187 | ✗ | zret = inflate(zstream, Z_SYNC_FLUSH); | |
| 188 | ✗ | if (zret != Z_OK && zret != Z_STREAM_END) { | |
| 189 | ✗ | av_log(avctx, AV_LOG_ERROR, | |
| 190 | "Inflate failed with return code: %d.\n", zret); | ||
| 191 | ✗ | return AVERROR_INVALIDDATA; | |
| 192 | } | ||
| 193 | |||
| 194 | ✗ | dst -= s->prev_frame->linesize[0]; | |
| 195 | } | ||
| 196 | } | ||
| 197 | |||
| 198 | ✗ | if (intra) | |
| 199 | ✗ | s->prev_frame->flags |= AV_FRAME_FLAG_KEY; | |
| 200 | else | ||
| 201 | ✗ | s->prev_frame->flags &= ~AV_FRAME_FLAG_KEY; | |
| 202 | ✗ | s->prev_frame->pict_type = intra ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P; | |
| 203 | |||
| 204 | ✗ | if ((ret = av_frame_ref(frame, s->prev_frame)) < 0) | |
| 205 | ✗ | return ret; | |
| 206 | |||
| 207 | ✗ | *got_frame = 1; | |
| 208 | |||
| 209 | ✗ | return avpkt->size; | |
| 210 | } | ||
| 211 | |||
| 212 | ✗ | static av_cold int decode_init(AVCodecContext *avctx) | |
| 213 | { | ||
| 214 | ✗ | WCMVContext *s = avctx->priv_data; | |
| 215 | |||
| 216 | ✗ | switch (avctx->bits_per_coded_sample) { | |
| 217 | ✗ | case 16: avctx->pix_fmt = AV_PIX_FMT_RGB565LE; break; | |
| 218 | ✗ | case 24: avctx->pix_fmt = AV_PIX_FMT_BGR24; break; | |
| 219 | ✗ | case 32: avctx->pix_fmt = AV_PIX_FMT_BGRA; break; | |
| 220 | ✗ | default: av_log(avctx, AV_LOG_ERROR, "Unsupported bits_per_coded_sample: %d\n", | |
| 221 | avctx->bits_per_coded_sample); | ||
| 222 | ✗ | return AVERROR_PATCHWELCOME; | |
| 223 | } | ||
| 224 | |||
| 225 | ✗ | s->bpp = avctx->bits_per_coded_sample >> 3; | |
| 226 | |||
| 227 | ✗ | s->prev_frame = av_frame_alloc(); | |
| 228 | ✗ | if (!s->prev_frame) | |
| 229 | ✗ | return AVERROR(ENOMEM); | |
| 230 | |||
| 231 | ✗ | return ff_inflate_init(&s->zstream, avctx); | |
| 232 | } | ||
| 233 | |||
| 234 | ✗ | static av_cold int decode_close(AVCodecContext *avctx) | |
| 235 | { | ||
| 236 | ✗ | WCMVContext *s = avctx->priv_data; | |
| 237 | |||
| 238 | ✗ | av_frame_free(&s->prev_frame); | |
| 239 | ✗ | ff_inflate_end(&s->zstream); | |
| 240 | |||
| 241 | ✗ | return 0; | |
| 242 | } | ||
| 243 | |||
| 244 | const FFCodec ff_wcmv_decoder = { | ||
| 245 | .p.name = "wcmv", | ||
| 246 | CODEC_LONG_NAME("WinCAM Motion Video"), | ||
| 247 | .p.type = AVMEDIA_TYPE_VIDEO, | ||
| 248 | .p.id = AV_CODEC_ID_WCMV, | ||
| 249 | .priv_data_size = sizeof(WCMVContext), | ||
| 250 | .init = decode_init, | ||
| 251 | .close = decode_close, | ||
| 252 | FF_CODEC_DECODE_CB(decode_frame), | ||
| 253 | .p.capabilities = AV_CODEC_CAP_DR1, | ||
| 254 | .caps_internal = FF_CODEC_CAP_INIT_CLEANUP, | ||
| 255 | }; | ||
| 256 |