| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Mandsoft Screen Capture Codec decoder | ||
| 3 | * | ||
| 4 | * Copyright (c) 2017 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 | #include <string.h> | ||
| 25 | |||
| 26 | #include "libavutil/mem.h" | ||
| 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 MSCCContext { | ||
| 36 | unsigned bpp; | ||
| 37 | unsigned int decomp_size; | ||
| 38 | uint8_t *decomp_buf; | ||
| 39 | unsigned int uncomp_size; | ||
| 40 | uint8_t *uncomp_buf; | ||
| 41 | FFZStream zstream; | ||
| 42 | |||
| 43 | uint32_t pal[256]; | ||
| 44 | } MSCCContext; | ||
| 45 | |||
| 46 | ✗ | static int rle_uncompress(AVCodecContext *avctx, GetByteContext *gb, PutByteContext *pb) | |
| 47 | { | ||
| 48 | ✗ | MSCCContext *s = avctx->priv_data; | |
| 49 | ✗ | unsigned x = 0, y = 0; | |
| 50 | |||
| 51 | ✗ | while (bytestream2_get_bytes_left(gb) > 0) { | |
| 52 | uint32_t fill; | ||
| 53 | int j; | ||
| 54 | ✗ | unsigned run = bytestream2_get_byte(gb); | |
| 55 | |||
| 56 | ✗ | if (run) { | |
| 57 | ✗ | if (bytestream2_get_bytes_left_p(pb) < run * s->bpp) | |
| 58 | ✗ | return AVERROR_INVALIDDATA; | |
| 59 | |||
| 60 | ✗ | switch (avctx->bits_per_coded_sample) { | |
| 61 | ✗ | case 8: | |
| 62 | ✗ | fill = bytestream2_get_byte(gb); | |
| 63 | ✗ | break; | |
| 64 | ✗ | case 16: | |
| 65 | ✗ | fill = bytestream2_get_le16(gb); | |
| 66 | ✗ | break; | |
| 67 | ✗ | case 24: | |
| 68 | ✗ | fill = bytestream2_get_le24(gb); | |
| 69 | ✗ | break; | |
| 70 | ✗ | case 32: | |
| 71 | ✗ | fill = bytestream2_get_le32(gb); | |
| 72 | ✗ | break; | |
| 73 | } | ||
| 74 | |||
| 75 | ✗ | for (j = 0; j < run; j++) { | |
| 76 | ✗ | switch (avctx->bits_per_coded_sample) { | |
| 77 | ✗ | case 8: | |
| 78 | ✗ | bytestream2_put_byte(pb, fill); | |
| 79 | ✗ | break; | |
| 80 | ✗ | case 16: | |
| 81 | ✗ | bytestream2_put_le16(pb, fill); | |
| 82 | ✗ | break; | |
| 83 | ✗ | case 24: | |
| 84 | ✗ | bytestream2_put_le24(pb, fill); | |
| 85 | ✗ | break; | |
| 86 | ✗ | case 32: | |
| 87 | ✗ | bytestream2_put_le32(pb, fill); | |
| 88 | ✗ | break; | |
| 89 | } | ||
| 90 | } | ||
| 91 | ✗ | x += run; | |
| 92 | } else { | ||
| 93 | ✗ | unsigned copy = bytestream2_get_byte(gb); | |
| 94 | |||
| 95 | ✗ | if (copy == 0) { | |
| 96 | ✗ | x = 0; | |
| 97 | ✗ | y++; | |
| 98 | ✗ | bytestream2_seek_p(pb, y * avctx->width * s->bpp, SEEK_SET); | |
| 99 | ✗ | } else if (copy == 1) { | |
| 100 | ✗ | return 0; | |
| 101 | ✗ | } else if (copy == 2) { | |
| 102 | |||
| 103 | ✗ | x += bytestream2_get_byte(gb); | |
| 104 | ✗ | y += bytestream2_get_byte(gb); | |
| 105 | |||
| 106 | ✗ | bytestream2_seek_p(pb, y * avctx->width * s->bpp + x * s->bpp, SEEK_SET); | |
| 107 | } else { | ||
| 108 | ✗ | if (bytestream2_get_bytes_left_p(pb) < copy * s->bpp) | |
| 109 | ✗ | return AVERROR_INVALIDDATA; | |
| 110 | |||
| 111 | ✗ | for (j = 0; j < copy; j++) { | |
| 112 | ✗ | switch (avctx->bits_per_coded_sample) { | |
| 113 | ✗ | case 8: | |
| 114 | ✗ | bytestream2_put_byte(pb, bytestream2_get_byte(gb)); | |
| 115 | ✗ | break; | |
| 116 | ✗ | case 16: | |
| 117 | ✗ | bytestream2_put_le16(pb, bytestream2_get_le16(gb)); | |
| 118 | ✗ | break; | |
| 119 | ✗ | case 24: | |
| 120 | ✗ | bytestream2_put_le24(pb, bytestream2_get_le24(gb)); | |
| 121 | ✗ | break; | |
| 122 | ✗ | case 32: | |
| 123 | ✗ | bytestream2_put_le32(pb, bytestream2_get_le32(gb)); | |
| 124 | ✗ | break; | |
| 125 | } | ||
| 126 | } | ||
| 127 | |||
| 128 | ✗ | if (s->bpp == 1 && (copy & 1)) | |
| 129 | ✗ | bytestream2_skip(gb, 1); | |
| 130 | ✗ | x += copy; | |
| 131 | } | ||
| 132 | } | ||
| 133 | } | ||
| 134 | |||
| 135 | ✗ | return AVERROR_INVALIDDATA; | |
| 136 | } | ||
| 137 | |||
| 138 | ✗ | static int decode_frame(AVCodecContext *avctx, AVFrame *frame, | |
| 139 | int *got_frame, AVPacket *avpkt) | ||
| 140 | { | ||
| 141 | ✗ | MSCCContext *s = avctx->priv_data; | |
| 142 | ✗ | z_stream *const zstream = &s->zstream.zstream; | |
| 143 | ✗ | const uint8_t *buf = avpkt->data; | |
| 144 | ✗ | int buf_size = avpkt->size; | |
| 145 | GetByteContext gb; | ||
| 146 | PutByteContext pb; | ||
| 147 | int ret, j; | ||
| 148 | |||
| 149 | ✗ | if (avpkt->size < 3) | |
| 150 | ✗ | return buf_size; | |
| 151 | |||
| 152 | ✗ | ret = inflateReset(zstream); | |
| 153 | ✗ | if (ret != Z_OK) { | |
| 154 | ✗ | av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", ret); | |
| 155 | ✗ | return AVERROR_UNKNOWN; | |
| 156 | } | ||
| 157 | ✗ | zstream->next_out = s->decomp_buf; | |
| 158 | ✗ | zstream->avail_out = s->decomp_size; | |
| 159 | ✗ | if (avctx->codec_id == AV_CODEC_ID_MSCC) { | |
| 160 | ✗ | const uint8_t start = avpkt->data[2] ^ avpkt->data[0]; | |
| 161 | |||
| 162 | ✗ | zstream->next_in = &start; | |
| 163 | ✗ | zstream->avail_in = 1; | |
| 164 | ✗ | ret = inflate(zstream, Z_NO_FLUSH); | |
| 165 | ✗ | if (ret != Z_OK || zstream->avail_in != 0) | |
| 166 | ✗ | goto inflate_error; | |
| 167 | |||
| 168 | ✗ | buf += 3; | |
| 169 | ✗ | buf_size -= 3; | |
| 170 | } | ||
| 171 | ✗ | zstream->next_in = buf; | |
| 172 | ✗ | zstream->avail_in = buf_size; | |
| 173 | ✗ | ret = inflate(zstream, Z_FINISH); | |
| 174 | ✗ | if (ret != Z_STREAM_END) { | |
| 175 | ✗ | inflate_error: | |
| 176 | ✗ | av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", ret); | |
| 177 | ✗ | return AVERROR_UNKNOWN; | |
| 178 | } | ||
| 179 | ✗ | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) | |
| 180 | ✗ | return ret; | |
| 181 | |||
| 182 | ✗ | if (avctx->pix_fmt == AV_PIX_FMT_PAL8) { | |
| 183 | size_t size; | ||
| 184 | ✗ | const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, &size); | |
| 185 | |||
| 186 | ✗ | if (pal && size == AVPALETTE_SIZE) { | |
| 187 | #if FF_API_PALETTE_HAS_CHANGED | ||
| 188 | FF_DISABLE_DEPRECATION_WARNINGS | ||
| 189 | ✗ | frame->palette_has_changed = 1; | |
| 190 | FF_ENABLE_DEPRECATION_WARNINGS | ||
| 191 | #endif | ||
| 192 | ✗ | for (j = 0; j < 256; j++) | |
| 193 | ✗ | s->pal[j] = 0xFF000000 | AV_RL32(pal + j * 4); | |
| 194 | ✗ | } else if (pal) { | |
| 195 | ✗ | av_log(avctx, AV_LOG_ERROR, | |
| 196 | "Palette size %"SIZE_SPECIFIER" is wrong\n", size); | ||
| 197 | } | ||
| 198 | ✗ | memcpy(frame->data[1], s->pal, AVPALETTE_SIZE); | |
| 199 | } | ||
| 200 | |||
| 201 | ✗ | bytestream2_init(&gb, s->decomp_buf, zstream->total_out); | |
| 202 | ✗ | bytestream2_init_writer(&pb, s->uncomp_buf, s->uncomp_size); | |
| 203 | |||
| 204 | ✗ | ret = rle_uncompress(avctx, &gb, &pb); | |
| 205 | ✗ | if (ret) | |
| 206 | ✗ | return ret; | |
| 207 | |||
| 208 | ✗ | for (j = 0; j < avctx->height; j++) { | |
| 209 | ✗ | memcpy(frame->data[0] + (avctx->height - j - 1) * frame->linesize[0], | |
| 210 | ✗ | s->uncomp_buf + s->bpp * j * avctx->width, s->bpp * avctx->width); | |
| 211 | } | ||
| 212 | |||
| 213 | ✗ | *got_frame = 1; | |
| 214 | |||
| 215 | ✗ | return avpkt->size; | |
| 216 | } | ||
| 217 | |||
| 218 | ✗ | static av_cold int decode_init(AVCodecContext *avctx) | |
| 219 | { | ||
| 220 | ✗ | MSCCContext *s = avctx->priv_data; | |
| 221 | int stride; | ||
| 222 | |||
| 223 | ✗ | switch (avctx->bits_per_coded_sample) { | |
| 224 | ✗ | case 8: avctx->pix_fmt = AV_PIX_FMT_PAL8; break; | |
| 225 | ✗ | case 16: avctx->pix_fmt = AV_PIX_FMT_RGB555; break; | |
| 226 | ✗ | case 24: avctx->pix_fmt = AV_PIX_FMT_BGR24; break; | |
| 227 | ✗ | case 32: avctx->pix_fmt = AV_PIX_FMT_BGRA; break; | |
| 228 | ✗ | default: | |
| 229 | ✗ | av_log(avctx, AV_LOG_ERROR, "Unsupported bitdepth %i\n", avctx->bits_per_coded_sample); | |
| 230 | ✗ | return AVERROR_INVALIDDATA; | |
| 231 | } | ||
| 232 | |||
| 233 | ✗ | s->bpp = avctx->bits_per_coded_sample >> 3; | |
| 234 | ✗ | stride = 4 * ((avctx->width * avctx->bits_per_coded_sample + 31) / 32); | |
| 235 | |||
| 236 | ✗ | s->decomp_size = 2 * avctx->height * stride; | |
| 237 | ✗ | if (!(s->decomp_buf = av_malloc(s->decomp_size))) | |
| 238 | ✗ | return AVERROR(ENOMEM); | |
| 239 | |||
| 240 | ✗ | s->uncomp_size = avctx->height * stride; | |
| 241 | ✗ | if (!(s->uncomp_buf = av_malloc(s->uncomp_size))) | |
| 242 | ✗ | return AVERROR(ENOMEM); | |
| 243 | |||
| 244 | ✗ | return ff_inflate_init(&s->zstream, avctx); | |
| 245 | } | ||
| 246 | |||
| 247 | ✗ | static av_cold int decode_close(AVCodecContext *avctx) | |
| 248 | { | ||
| 249 | ✗ | MSCCContext *s = avctx->priv_data; | |
| 250 | |||
| 251 | ✗ | av_freep(&s->decomp_buf); | |
| 252 | ✗ | s->decomp_size = 0; | |
| 253 | ✗ | av_freep(&s->uncomp_buf); | |
| 254 | ✗ | s->uncomp_size = 0; | |
| 255 | ✗ | ff_inflate_end(&s->zstream); | |
| 256 | |||
| 257 | ✗ | return 0; | |
| 258 | } | ||
| 259 | |||
| 260 | const FFCodec ff_mscc_decoder = { | ||
| 261 | .p.name = "mscc", | ||
| 262 | CODEC_LONG_NAME("Mandsoft Screen Capture Codec"), | ||
| 263 | .p.type = AVMEDIA_TYPE_VIDEO, | ||
| 264 | .p.id = AV_CODEC_ID_MSCC, | ||
| 265 | .priv_data_size = sizeof(MSCCContext), | ||
| 266 | .init = decode_init, | ||
| 267 | .close = decode_close, | ||
| 268 | FF_CODEC_DECODE_CB(decode_frame), | ||
| 269 | .p.capabilities = AV_CODEC_CAP_DR1, | ||
| 270 | .caps_internal = FF_CODEC_CAP_INIT_CLEANUP, | ||
| 271 | }; | ||
| 272 | |||
| 273 | const FFCodec ff_srgc_decoder = { | ||
| 274 | .p.name = "srgc", | ||
| 275 | CODEC_LONG_NAME("Screen Recorder Gold Codec"), | ||
| 276 | .p.type = AVMEDIA_TYPE_VIDEO, | ||
| 277 | .p.id = AV_CODEC_ID_SRGC, | ||
| 278 | .priv_data_size = sizeof(MSCCContext), | ||
| 279 | .init = decode_init, | ||
| 280 | .close = decode_close, | ||
| 281 | FF_CODEC_DECODE_CB(decode_frame), | ||
| 282 | .p.capabilities = AV_CODEC_CAP_DR1, | ||
| 283 | .caps_internal = FF_CODEC_CAP_INIT_CLEANUP, | ||
| 284 | }; | ||
| 285 |