| 1 | /* |
| 2 | * CDXL video decoder |
| 3 | * Copyright (c) 2011-2012 Paul B Mahol |
| 4 | * |
| 5 | * This file is part of FFmpeg. |
| 6 | * |
| 7 | * FFmpeg is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU Lesser General Public |
| 9 | * License as published by the Free Software Foundation; either |
| 10 | * version 2.1 of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * FFmpeg is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public |
| 18 | * License along with FFmpeg; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | */ |
| 21 | |
| 22 | /** |
| 23 | * @file |
| 24 | * Commodore CDXL video decoder |
| 25 | * @author Paul B Mahol |
| 26 | */ |
| 27 | |
| 28 | #define UNCHECKED_BITSTREAM_READER 1 |
| 29 | |
| 30 | #include "libavutil/intreadwrite.h" |
| 31 | #include "libavutil/imgutils.h" |
| 32 | #include "avcodec.h" |
| 33 | #include "get_bits.h" |
| 34 | #include "internal.h" |
| 35 | |
| 36 | #define BIT_PLANAR 0x00 |
| 37 | #define CHUNKY 0x20 |
| 38 | #define BYTE_PLANAR 0x40 |
| 39 | #define BIT_LINE 0x80 |
| 40 | #define BYTE_LINE 0xC0 |
| 41 | |
| 42 | typedef struct { |
| 43 | AVCodecContext *avctx; |
| 44 | int bpp; |
| 45 | int format; |
| 46 | int padded_bits; |
| 47 | const uint8_t *palette; |
| 48 | int palette_size; |
| 49 | const uint8_t *video; |
| 50 | int video_size; |
| 51 | uint8_t *new_video; |
| 52 | int new_video_size; |
| 53 | } CDXLVideoContext; |
| 54 | |
| 55 | static av_cold int cdxl_decode_init(AVCodecContext *avctx) |
| 56 | { |
| 57 | CDXLVideoContext *c = avctx->priv_data; |
| 58 | |
| 59 | c->new_video_size = 0; |
| 60 | c->avctx = avctx; |
| 61 | |
| 62 | return 0; |
| 63 | } |
| 64 | |
| 65 | static void import_palette(CDXLVideoContext *c, uint32_t *new_palette) |
| 66 | { |
| 67 | int i; |
| 68 | |
| 69 | for (i = 0; i < c->palette_size / 2; i++) { |
| 70 | unsigned rgb = AV_RB16(&c->palette[i * 2]); |
| 71 | unsigned r = ((rgb >> 8) & 0xF) * 0x11; |
| 72 | unsigned g = ((rgb >> 4) & 0xF) * 0x11; |
| 73 | unsigned b = (rgb & 0xF) * 0x11; |
| 74 | AV_WN32(&new_palette[i], (0xFFU << 24) | (r << 16) | (g << 8) | b); |
| 75 | } |
| 76 | } |
| 77 | |
| 78 | static void bitplanar2chunky(CDXLVideoContext *c, int linesize, uint8_t *out) |
| 79 | { |
| 80 | GetBitContext gb; |
| 81 | int x, y, plane; |
| 82 | |
| 83 | init_get_bits(&gb, c->video, c->video_size * 8); |
| 84 | for (plane = 0; plane < c->bpp; plane++) { |
| 85 | for (y = 0; y < c->avctx->height; y++) { |
| 86 | for (x = 0; x < c->avctx->width; x++) |
| 87 | out[linesize * y + x] |= get_bits1(&gb) << plane; |
| 88 | skip_bits(&gb, c->padded_bits); |
| 89 | } |
| 90 | } |
| 91 | } |
| 92 | |
| 93 | static void bitline2chunky(CDXLVideoContext *c, int linesize, uint8_t *out) |
| 94 | { |
| 95 | GetBitContext gb; |
| 96 | int x, y, plane; |
| 97 | |
| 98 | init_get_bits(&gb, c->video, c->video_size * 8); |
| 99 | for (y = 0; y < c->avctx->height; y++) { |
| 100 | for (plane = 0; plane < c->bpp; plane++) { |
| 101 | for (x = 0; x < c->avctx->width; x++) |
| 102 | out[linesize * y + x] |= get_bits1(&gb) << plane; |
| 103 | skip_bits(&gb, c->padded_bits); |
| 104 | } |
| 105 | } |
| 106 | } |
| 107 | |
| 108 | static void import_format(CDXLVideoContext *c, int linesize, uint8_t *out) |
| 109 | { |
| 110 | memset(out, 0, linesize * c->avctx->height); |
| 111 | |
| 112 | switch (c->format) { |
| 113 | case BIT_PLANAR: |
| 114 | bitplanar2chunky(c, linesize, out); |
| 115 | break; |
| 116 | case BIT_LINE: |
| 117 | bitline2chunky(c, linesize, out); |
| 118 | break; |
| 119 | } |
| 120 | } |
| 121 | |
| 122 | static void cdxl_decode_rgb(CDXLVideoContext *c, AVFrame *frame) |
| 123 | { |
| 124 | uint32_t *new_palette = (uint32_t *)frame->data[1]; |
| 125 | |
| 126 | memset(frame->data[1], 0, AVPALETTE_SIZE); |
| 127 | import_palette(c, new_palette); |
| 128 | import_format(c, frame->linesize[0], frame->data[0]); |
| 129 | } |
| 130 | |
| 131 | static void cdxl_decode_ham6(CDXLVideoContext *c, AVFrame *frame) |
| 132 | { |
| 133 | AVCodecContext *avctx = c->avctx; |
| 134 | uint32_t new_palette[16], r, g, b; |
| 135 | uint8_t *ptr, *out, index, op; |
| 136 | int x, y; |
| 137 | |
| 138 | ptr = c->new_video; |
| 139 | out = frame->data[0]; |
| 140 | |
| 141 | import_palette(c, new_palette); |
| 142 | import_format(c, avctx->width, c->new_video); |
| 143 | |
| 144 | for (y = 0; y < avctx->height; y++) { |
| 145 | r = new_palette[0] & 0xFF0000; |
| 146 | g = new_palette[0] & 0xFF00; |
| 147 | b = new_palette[0] & 0xFF; |
| 148 | for (x = 0; x < avctx->width; x++) { |
| 149 | index = *ptr++; |
| 150 | op = index >> 4; |
| 151 | index &= 15; |
| 152 | switch (op) { |
| 153 | case 0: |
| 154 | r = new_palette[index] & 0xFF0000; |
| 155 | g = new_palette[index] & 0xFF00; |
| 156 | b = new_palette[index] & 0xFF; |
| 157 | break; |
| 158 | case 1: |
| 159 | b = index * 0x11; |
| 160 | break; |
| 161 | case 2: |
| 162 | r = index * 0x11 << 16; |
| 163 | break; |
| 164 | case 3: |
| 165 | g = index * 0x11 << 8; |
| 166 | break; |
| 167 | } |
| 168 | AV_WL24(out + x * 3, r | g | b); |
| 169 | } |
| 170 | out += frame->linesize[0]; |
| 171 | } |
| 172 | } |
| 173 | |
| 174 | static void cdxl_decode_ham8(CDXLVideoContext *c, AVFrame *frame) |
| 175 | { |
| 176 | AVCodecContext *avctx = c->avctx; |
| 177 | uint32_t new_palette[64], r, g, b; |
| 178 | uint8_t *ptr, *out, index, op; |
| 179 | int x, y; |
| 180 | |
| 181 | ptr = c->new_video; |
| 182 | out = frame->data[0]; |
| 183 | |
| 184 | import_palette(c, new_palette); |
| 185 | import_format(c, avctx->width, c->new_video); |
| 186 | |
| 187 | for (y = 0; y < avctx->height; y++) { |
| 188 | r = new_palette[0] & 0xFF0000; |
| 189 | g = new_palette[0] & 0xFF00; |
| 190 | b = new_palette[0] & 0xFF; |
| 191 | for (x = 0; x < avctx->width; x++) { |
| 192 | index = *ptr++; |
| 193 | op = index >> 6; |
| 194 | index &= 63; |
| 195 | switch (op) { |
| 196 | case 0: |
| 197 | r = new_palette[index] & 0xFF0000; |
| 198 | g = new_palette[index] & 0xFF00; |
| 199 | b = new_palette[index] & 0xFF; |
| 200 | break; |
| 201 | case 1: |
| 202 | b = (index << 2) | (b & 3); |
| 203 | break; |
| 204 | case 2: |
| 205 | r = (index << 18) | (r & (3 << 16)); |
| 206 | break; |
| 207 | case 3: |
| 208 | g = (index << 10) | (g & (3 << 8)); |
| 209 | break; |
| 210 | } |
| 211 | AV_WL24(out + x * 3, r | g | b); |
| 212 | } |
| 213 | out += frame->linesize[0]; |
| 214 | } |
| 215 | } |
| 216 | |
| 217 | static int cdxl_decode_frame(AVCodecContext *avctx, void *data, |
| 218 | int *got_frame, AVPacket *pkt) |
| 219 | { |
| 220 | CDXLVideoContext *c = avctx->priv_data; |
| 221 | AVFrame * const p = data; |
| 222 | int ret, w, h, encoding, aligned_width, buf_size = pkt->size; |
| 223 | const uint8_t *buf = pkt->data; |
| 224 | |
| 225 | if (buf_size < 32) |
| 226 | return AVERROR_INVALIDDATA; |
| 227 | encoding = buf[1] & 7; |
| 228 | c->format = buf[1] & 0xE0; |
| 229 | w = AV_RB16(&buf[14]); |
| 230 | h = AV_RB16(&buf[16]); |
| 231 | c->bpp = buf[19]; |
| 232 | c->palette_size = AV_RB16(&buf[20]); |
| 233 | c->palette = buf + 32; |
| 234 | c->video = c->palette + c->palette_size; |
| 235 | c->video_size = buf_size - c->palette_size - 32; |
| 236 | |
| 237 | if (c->palette_size > 512) |
| 238 | return AVERROR_INVALIDDATA; |
| 239 | if (buf_size < c->palette_size + 32) |
| 240 | return AVERROR_INVALIDDATA; |
| 241 | if (c->bpp < 1) |
| 242 | return AVERROR_INVALIDDATA; |
| 243 | if (c->format != BIT_PLANAR && c->format != BIT_LINE) { |
| 244 | avpriv_request_sample(avctx, "Pixel format 0x%0x", c->format); |
| 245 | return AVERROR_PATCHWELCOME; |
| 246 | } |
| 247 | |
| 248 | if ((ret = ff_set_dimensions(avctx, w, h)) < 0) |
| 249 | return ret; |
| 250 | |
| 251 | aligned_width = FFALIGN(c->avctx->width, 16); |
| 252 | c->padded_bits = aligned_width - c->avctx->width; |
| 253 | if (c->video_size < aligned_width * avctx->height * c->bpp / 8) |
| 254 | return AVERROR_INVALIDDATA; |
| 255 | if (!encoding && c->palette_size && c->bpp <= 8) { |
| 256 | avctx->pix_fmt = AV_PIX_FMT_PAL8; |
| 257 | } else if (encoding == 1 && (c->bpp == 6 || c->bpp == 8)) { |
| 258 | if (c->palette_size != (1 << (c->bpp - 1))) |
| 259 | return AVERROR_INVALIDDATA; |
| 260 | avctx->pix_fmt = AV_PIX_FMT_BGR24; |
| 261 | } else { |
| 262 | avpriv_request_sample(avctx, "Encoding %d and bpp %d", |
| 263 | encoding, c->bpp); |
| 264 | return AVERROR_PATCHWELCOME; |
| 265 | } |
| 266 | |
| 267 | if ((ret = ff_get_buffer(avctx, p, 0)) < 0) |
| 268 | return ret; |
| 269 | p->pict_type = AV_PICTURE_TYPE_I; |
| 270 | |
| 271 | if (encoding) { |
| 272 | av_fast_padded_malloc(&c->new_video, &c->new_video_size, |
| 273 | h * w + FF_INPUT_BUFFER_PADDING_SIZE); |
| 274 | if (!c->new_video) |
| 275 | return AVERROR(ENOMEM); |
| 276 | if (c->bpp == 8) |
| 277 | cdxl_decode_ham8(c, p); |
| 278 | else |
| 279 | cdxl_decode_ham6(c, p); |
| 280 | } else { |
| 281 | cdxl_decode_rgb(c, p); |
| 282 | } |
| 283 | *got_frame = 1; |
| 284 | |
| 285 | return buf_size; |
| 286 | } |
| 287 | |
| 288 | static av_cold int cdxl_decode_end(AVCodecContext *avctx) |
| 289 | { |
| 290 | CDXLVideoContext *c = avctx->priv_data; |
| 291 | |
| 292 | av_freep(&c->new_video); |
| 293 | |
| 294 | return 0; |
| 295 | } |
| 296 | |
| 297 | AVCodec ff_cdxl_decoder = { |
| 298 | .name = "cdxl", |
| 299 | .long_name = NULL_IF_CONFIG_SMALL("Commodore CDXL video"), |
| 300 | .type = AVMEDIA_TYPE_VIDEO, |
| 301 | .id = AV_CODEC_ID_CDXL, |
| 302 | .priv_data_size = sizeof(CDXLVideoContext), |
| 303 | .init = cdxl_decode_init, |
| 304 | .close = cdxl_decode_end, |
| 305 | .decode = cdxl_decode_frame, |
| 306 | .capabilities = CODEC_CAP_DR1, |
| 307 | }; |