| @@ -0,0 +1,231 @@ |
| 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 <stdlib.h> |
| 25 | +#include <string.h> |
| 26 | + |
| 27 | +#include "avcodec.h" |
| 28 | +#include "bytestream.h" |
| 29 | +#include "internal.h" |
| 30 | + |
| 31 | +#include <zlib.h> |
| 32 | + |
| 33 | +typedef struct MSCCContext { |
| 34 | + unsigned bpp; |
| 35 | + unsigned int decomp_size; |
| 36 | + uint8_t *decomp_buf; |
| 37 | + unsigned int uncomp_size; |
| 38 | + uint8_t *uncomp_buf; |
| 39 | + z_stream zstream; |
| 40 | +} MSCCContext; |
| 41 | + |
| 42 | +static int rle_uncompress(AVCodecContext *avctx, GetByteContext *gb, PutByteContext *pb, int bpp) |
| 43 | +{ |
| 44 | + while (bytestream2_get_bytes_left(gb) > 0) { |
| 45 | + uint32_t fill; |
| 46 | + int j; |
| 47 | + unsigned run = bytestream2_get_byte(gb); |
| 48 | + |
| 49 | + if (run) { |
| 50 | + switch (avctx->bits_per_coded_sample) { |
| 51 | + case 8: |
| 52 | + fill = bytestream2_get_byte(gb); |
| 53 | + break; |
| 54 | + case 16: |
| 55 | + fill = bytestream2_get_le16(gb); |
| 56 | + break; |
| 57 | + case 24: |
| 58 | + fill = bytestream2_get_le24(gb); |
| 59 | + break; |
| 60 | + case 32: |
| 61 | + fill = bytestream2_get_le32(gb); |
| 62 | + break; |
| 63 | + } |
| 64 | + |
| 65 | + for (j = 0; j < run; j++) { |
| 66 | + switch (avctx->bits_per_coded_sample) { |
| 67 | + case 8: |
| 68 | + bytestream2_put_byte(pb, fill); |
| 69 | + break; |
| 70 | + case 16: |
| 71 | + bytestream2_put_le16(pb, fill); |
| 72 | + break; |
| 73 | + case 24: |
| 74 | + bytestream2_put_le24(pb, fill); |
| 75 | + break; |
| 76 | + case 32: |
| 77 | + bytestream2_put_le32(pb, fill); |
| 78 | + break; |
| 79 | + } |
| 80 | + } |
| 81 | + } else { |
| 82 | + unsigned copy = bytestream2_get_byte(gb); |
| 83 | + |
| 84 | + if (copy == 1) { |
| 85 | + return 0; |
| 86 | + } else if (copy == 2) { |
| 87 | + unsigned x, y; |
| 88 | + |
| 89 | + x = bytestream2_get_byte(gb); |
| 90 | + y = bytestream2_get_byte(gb); |
| 91 | + |
| 92 | + bytestream2_skip_p(pb, x * bpp); |
| 93 | + bytestream2_skip_p(pb, y * bpp * avctx->width); |
| 94 | + } else { |
| 95 | + for (j = 0; j < copy; j++) { |
| 96 | + switch (avctx->bits_per_coded_sample) { |
| 97 | + case 8: |
| 98 | + bytestream2_put_byte(pb, bytestream2_get_byte(gb)); |
| 99 | + break; |
| 100 | + case 16: |
| 101 | + bytestream2_put_le16(pb, bytestream2_get_le16(gb)); |
| 102 | + break; |
| 103 | + case 24: |
| 104 | + bytestream2_put_le24(pb, bytestream2_get_le24(gb)); |
| 105 | + break; |
| 106 | + case 32: |
| 107 | + bytestream2_put_le32(pb, bytestream2_get_le32(gb)); |
| 108 | + break; |
| 109 | + } |
| 110 | + } |
| 111 | + } |
| 112 | + } |
| 113 | + } |
| 114 | + |
| 115 | + return AVERROR_INVALIDDATA; |
| 116 | +} |
| 117 | + |
| 118 | +static int decode_frame(AVCodecContext *avctx, |
| 119 | + void *data, int *got_frame, |
| 120 | + AVPacket *avpkt) |
| 121 | +{ |
| 122 | + MSCCContext *s = avctx->priv_data; |
| 123 | + AVFrame *frame = data; |
| 124 | + GetByteContext gb; |
| 125 | + PutByteContext pb; |
| 126 | + int ret, j; |
| 127 | + |
| 128 | + if (avpkt->size < 3) |
| 129 | + return AVERROR_INVALIDDATA; |
| 130 | + if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
| 131 | + return ret; |
| 132 | + |
| 133 | + avpkt->data[2] ^= avpkt->data[0]; |
| 134 | + |
| 135 | + ret = inflateReset(&s->zstream); |
| 136 | + if (ret != Z_OK) { |
| 137 | + av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", ret); |
| 138 | + return AVERROR_UNKNOWN; |
| 139 | + } |
| 140 | + s->zstream.next_in = avpkt->data + 2; |
| 141 | + s->zstream.avail_in = avpkt->size - 2; |
| 142 | + s->zstream.next_out = s->decomp_buf; |
| 143 | + s->zstream.avail_out = s->decomp_size; |
| 144 | + ret = inflate(&s->zstream, Z_FINISH); |
| 145 | + if (ret != Z_STREAM_END) { |
| 146 | + av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", ret); |
| 147 | + return AVERROR_UNKNOWN; |
| 148 | + } |
| 149 | + |
| 150 | + bytestream2_init(&gb, s->decomp_buf, s->zstream.total_out); |
| 151 | + bytestream2_init_writer(&pb, s->uncomp_buf, s->uncomp_size); |
| 152 | + |
| 153 | + ret = rle_uncompress(avctx, &gb, &pb, s->bpp); |
| 154 | + if (ret) |
| 155 | + return ret; |
| 156 | + |
| 157 | + for (j = 0; j < avctx->height; j++) { |
| 158 | + memcpy(frame->data[0] + (avctx->height - j - 1) * frame->linesize[0], |
| 159 | + s->uncomp_buf + s->bpp * j * avctx->width, s->bpp * avctx->width); |
| 160 | + } |
| 161 | + |
| 162 | + frame->key_frame = 1; |
| 163 | + frame->pict_type = AV_PICTURE_TYPE_I; |
| 164 | + |
| 165 | + *got_frame = 1; |
| 166 | + |
| 167 | + return avpkt->size; |
| 168 | +} |
| 169 | + |
| 170 | +static av_cold int decode_init(AVCodecContext *avctx) |
| 171 | +{ |
| 172 | + MSCCContext *s = avctx->priv_data; |
| 173 | + int zret; |
| 174 | + |
| 175 | + switch (avctx->bits_per_coded_sample) { |
| 176 | + case 8: avctx->pix_fmt = AV_PIX_FMT_GRAY8; break; |
| 177 | + case 16: avctx->pix_fmt = AV_PIX_FMT_RGB555; break; |
| 178 | + case 24: avctx->pix_fmt = AV_PIX_FMT_BGR24; break; |
| 179 | + case 32: avctx->pix_fmt = AV_PIX_FMT_BGRA; break; |
| 180 | + default: |
| 181 | + av_log(avctx, AV_LOG_ERROR, "Unsupported bitdepth %i\n", avctx->bits_per_coded_sample); |
| 182 | + return AVERROR_INVALIDDATA; |
| 183 | + } |
| 184 | + |
| 185 | + s->bpp = avctx->bits_per_coded_sample >> 3; |
| 186 | + memset(&s->zstream, 0, sizeof(z_stream)); |
| 187 | + |
| 188 | + s->decomp_size = 4 * avctx->height * ((avctx->width * avctx->bits_per_coded_sample + 31) / 32); |
| 189 | + if (!(s->decomp_buf = av_malloc(s->decomp_size))) |
| 190 | + return AVERROR(ENOMEM); |
| 191 | + |
| 192 | + s->uncomp_size = 4 * avctx->height * ((avctx->width * avctx->bits_per_coded_sample + 31) / 32); |
| 193 | + if (!(s->uncomp_buf = av_malloc(s->uncomp_size))) |
| 194 | + return AVERROR(ENOMEM); |
| 195 | + |
| 196 | + s->zstream.zalloc = Z_NULL; |
| 197 | + s->zstream.zfree = Z_NULL; |
| 198 | + s->zstream.opaque = Z_NULL; |
| 199 | + zret = inflateInit(&s->zstream); |
| 200 | + if (zret != Z_OK) { |
| 201 | + av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret); |
| 202 | + return AVERROR_UNKNOWN; |
| 203 | + } |
| 204 | + |
| 205 | + return 0; |
| 206 | +} |
| 207 | + |
| 208 | +static av_cold int decode_close(AVCodecContext *avctx) |
| 209 | +{ |
| 210 | + MSCCContext *s = avctx->priv_data; |
| 211 | + |
| 212 | + av_freep(&s->decomp_buf); |
| 213 | + s->decomp_size = 0; |
| 214 | + av_freep(&s->uncomp_buf); |
| 215 | + s->uncomp_size = 0; |
| 216 | + inflateEnd(&s->zstream); |
| 217 | + |
| 218 | + return 0; |
| 219 | +} |
| 220 | + |
| 221 | +AVCodec ff_mscc_decoder = { |
| 222 | + .name = "mscc", |
| 223 | + .long_name = NULL_IF_CONFIG_SMALL("Mandsoft Screen Capture Codec"), |
| 224 | + .type = AVMEDIA_TYPE_VIDEO, |
| 225 | + .id = AV_CODEC_ID_MSCC, |
| 226 | + .priv_data_size = sizeof(MSCCContext), |
| 227 | + .init = decode_init, |
| 228 | + .close = decode_close, |
| 229 | + .decode = decode_frame, |
| 230 | + .capabilities = AV_CODEC_CAP_DR1, |
| 231 | +}; |