1/* 2 * Motion Pixels Video Decoder 3 * Copyright (c) 2008 Gregory Montoir (cyx@users.sourceforge.net) 4 * 5 * This file is part of Libav. 6 * 7 * Libav 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 * Libav 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 Libav; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22#include "avcodec.h" 23#include "get_bits.h" 24#include "dsputil.h" 25 26#define MAX_HUFF_CODES 16 27 28#include "motionpixels_tablegen.h" 29 30typedef struct HuffCode { 31 int code; 32 uint8_t size; 33 uint8_t delta; 34} HuffCode; 35 36typedef struct MotionPixelsContext { 37 AVCodecContext *avctx; 38 AVFrame frame; 39 DSPContext dsp; 40 uint8_t *changes_map; 41 int offset_bits_len; 42 int codes_count, current_codes_count; 43 int max_codes_bits; 44 HuffCode codes[MAX_HUFF_CODES]; 45 VLC vlc; 46 YuvPixel *vpt, *hpt; 47 uint8_t gradient_scale[3]; 48 uint8_t *bswapbuf; 49 int bswapbuf_size; 50} MotionPixelsContext; 51 52static av_cold int mp_decode_init(AVCodecContext *avctx) 53{ 54 MotionPixelsContext *mp = avctx->priv_data; 55 int w4 = (avctx->width + 3) & ~3; 56 int h4 = (avctx->height + 3) & ~3; 57 58 motionpixels_tableinit(); 59 mp->avctx = avctx; 60 dsputil_init(&mp->dsp, avctx); 61 mp->changes_map = av_mallocz(avctx->width * h4); 62 mp->offset_bits_len = av_log2(avctx->width * avctx->height) + 1; 63 mp->vpt = av_mallocz(avctx->height * sizeof(YuvPixel)); 64 mp->hpt = av_mallocz(h4 * w4 / 16 * sizeof(YuvPixel)); 65 avctx->pix_fmt = PIX_FMT_RGB555; 66 return 0; 67} 68 69static void mp_read_changes_map(MotionPixelsContext *mp, GetBitContext *gb, int count, int bits_len, int read_color) 70{ 71 uint16_t *pixels; 72 int offset, w, h, color = 0, x, y, i; 73 74 while (count--) { 75 offset = get_bits_long(gb, mp->offset_bits_len); 76 w = get_bits(gb, bits_len) + 1; 77 h = get_bits(gb, bits_len) + 1; 78 if (read_color) 79 color = get_bits(gb, 15); 80 x = offset % mp->avctx->width; 81 y = offset / mp->avctx->width; 82 if (y >= mp->avctx->height) 83 continue; 84 w = FFMIN(w, mp->avctx->width - x); 85 h = FFMIN(h, mp->avctx->height - y); 86 pixels = (uint16_t *)&mp->frame.data[0][y * mp->frame.linesize[0] + x * 2]; 87 while (h--) { 88 mp->changes_map[offset] = w; 89 if (read_color) 90 for (i = 0; i < w; ++i) 91 pixels[i] = color; 92 offset += mp->avctx->width; 93 pixels += mp->frame.linesize[0] / 2; 94 } 95 } 96} 97 98static void mp_get_code(MotionPixelsContext *mp, GetBitContext *gb, int size, int code) 99{ 100 while (get_bits1(gb)) { 101 ++size; 102 if (size > mp->max_codes_bits) { 103 av_log(mp->avctx, AV_LOG_ERROR, "invalid code size %d/%d\n", size, mp->max_codes_bits); 104 return; 105 } 106 code <<= 1; 107 mp_get_code(mp, gb, size, code + 1); 108 } 109 if (mp->current_codes_count >= MAX_HUFF_CODES) { 110 av_log(mp->avctx, AV_LOG_ERROR, "too many codes\n"); 111 return; 112 } 113 mp->codes[mp->current_codes_count ].code = code; 114 mp->codes[mp->current_codes_count++].size = size; 115} 116 117static void mp_read_codes_table(MotionPixelsContext *mp, GetBitContext *gb) 118{ 119 if (mp->codes_count == 1) { 120 mp->codes[0].delta = get_bits(gb, 4); 121 } else { 122 int i; 123 124 mp->max_codes_bits = get_bits(gb, 4); 125 for (i = 0; i < mp->codes_count; ++i) 126 mp->codes[i].delta = get_bits(gb, 4); 127 mp->current_codes_count = 0; 128 mp_get_code(mp, gb, 0, 0); 129 } 130} 131 132static int mp_gradient(MotionPixelsContext *mp, int component, int v) 133{ 134 int delta; 135 136 delta = (v - 7) * mp->gradient_scale[component]; 137 mp->gradient_scale[component] = (v == 0 || v == 14) ? 2 : 1; 138 return delta; 139} 140 141static YuvPixel mp_get_yuv_from_rgb(MotionPixelsContext *mp, int x, int y) 142{ 143 int color; 144 145 color = *(uint16_t *)&mp->frame.data[0][y * mp->frame.linesize[0] + x * 2]; 146 return mp_rgb_yuv_table[color]; 147} 148 149static void mp_set_rgb_from_yuv(MotionPixelsContext *mp, int x, int y, const YuvPixel *p) 150{ 151 int color; 152 153 color = mp_yuv_to_rgb(p->y, p->v, p->u, 1); 154 *(uint16_t *)&mp->frame.data[0][y * mp->frame.linesize[0] + x * 2] = color; 155} 156 157static int mp_get_vlc(MotionPixelsContext *mp, GetBitContext *gb) 158{ 159 int i; 160 161 i = (mp->codes_count == 1) ? 0 : get_vlc2(gb, mp->vlc.table, mp->max_codes_bits, 1); 162 return mp->codes[i].delta; 163} 164 165static void mp_decode_line(MotionPixelsContext *mp, GetBitContext *gb, int y) 166{ 167 YuvPixel p; 168 const int y0 = y * mp->avctx->width; 169 int w, i, x = 0; 170 171 p = mp->vpt[y]; 172 if (mp->changes_map[y0 + x] == 0) { 173 memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale)); 174 ++x; 175 } 176 while (x < mp->avctx->width) { 177 w = mp->changes_map[y0 + x]; 178 if (w != 0) { 179 if ((y & 3) == 0) { 180 if (mp->changes_map[y0 + x + mp->avctx->width] < w || 181 mp->changes_map[y0 + x + mp->avctx->width * 2] < w || 182 mp->changes_map[y0 + x + mp->avctx->width * 3] < w) { 183 for (i = (x + 3) & ~3; i < x + w; i += 4) { 184 mp->hpt[((y / 4) * mp->avctx->width + i) / 4] = mp_get_yuv_from_rgb(mp, i, y); 185 } 186 } 187 } 188 x += w; 189 memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale)); 190 p = mp_get_yuv_from_rgb(mp, x - 1, y); 191 } else { 192 p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb)); 193 p.y = av_clip(p.y, 0, 31); 194 if ((x & 3) == 0) { 195 if ((y & 3) == 0) { 196 p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb)); 197 p.v = av_clip(p.v, -32, 31); 198 p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb)); 199 p.u = av_clip(p.u, -32, 31); 200 mp->hpt[((y / 4) * mp->avctx->width + x) / 4] = p; 201 } else { 202 p.v = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].v; 203 p.u = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].u; 204 } 205 } 206 mp_set_rgb_from_yuv(mp, x, y, &p); 207 ++x; 208 } 209 } 210} 211 212static void mp_decode_frame_helper(MotionPixelsContext *mp, GetBitContext *gb) 213{ 214 YuvPixel p; 215 int y, y0; 216 217 for (y = 0; y < mp->avctx->height; ++y) { 218 if (mp->changes_map[y * mp->avctx->width] != 0) { 219 memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale)); 220 p = mp_get_yuv_from_rgb(mp, 0, y); 221 } else { 222 p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb)); 223 p.y = av_clip(p.y, 0, 31); 224 if ((y & 3) == 0) { 225 p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb)); 226 p.v = av_clip(p.v, -32, 31); 227 p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb)); 228 p.u = av_clip(p.u, -32, 31); 229 } 230 mp->vpt[y] = p; 231 mp_set_rgb_from_yuv(mp, 0, y, &p); 232 } 233 } 234 for (y0 = 0; y0 < 2; ++y0) 235 for (y = y0; y < mp->avctx->height; y += 2) 236 mp_decode_line(mp, gb, y); 237} 238 239static int mp_decode_frame(AVCodecContext *avctx, 240 void *data, int *data_size, 241 AVPacket *avpkt) 242{ 243 const uint8_t *buf = avpkt->data; 244 int buf_size = avpkt->size; 245 MotionPixelsContext *mp = avctx->priv_data; 246 GetBitContext gb; 247 int i, count1, count2, sz; 248 249 mp->frame.reference = 1; 250 mp->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE; 251 if (avctx->reget_buffer(avctx, &mp->frame)) { 252 av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n"); 253 return -1; 254 } 255 256 /* le32 bitstream msb first */ 257 av_fast_malloc(&mp->bswapbuf, &mp->bswapbuf_size, buf_size + FF_INPUT_BUFFER_PADDING_SIZE); 258 if (!mp->bswapbuf) 259 return AVERROR(ENOMEM); 260 mp->dsp.bswap_buf((uint32_t *)mp->bswapbuf, (const uint32_t *)buf, buf_size / 4); 261 if (buf_size & 3) 262 memcpy(mp->bswapbuf + (buf_size & ~3), buf + (buf_size & ~3), buf_size & 3); 263 memset(mp->bswapbuf + buf_size, 0, FF_INPUT_BUFFER_PADDING_SIZE); 264 init_get_bits(&gb, mp->bswapbuf, buf_size * 8); 265 266 memset(mp->changes_map, 0, avctx->width * avctx->height); 267 for (i = !(avctx->extradata[1] & 2); i < 2; ++i) { 268 count1 = get_bits(&gb, 12); 269 count2 = get_bits(&gb, 12); 270 mp_read_changes_map(mp, &gb, count1, 8, i); 271 mp_read_changes_map(mp, &gb, count2, 4, i); 272 } 273 274 mp->codes_count = get_bits(&gb, 4); 275 if (mp->codes_count == 0) 276 goto end; 277 278 if (mp->changes_map[0] == 0) { 279 *(uint16_t *)mp->frame.data[0] = get_bits(&gb, 15); 280 mp->changes_map[0] = 1; 281 } 282 mp_read_codes_table(mp, &gb); 283 284 sz = get_bits(&gb, 18); 285 if (avctx->extradata[0] != 5) 286 sz += get_bits(&gb, 18); 287 if (sz == 0) 288 goto end; 289 290 if (mp->max_codes_bits <= 0) 291 goto end; 292 if (init_vlc(&mp->vlc, mp->max_codes_bits, mp->codes_count, &mp->codes[0].size, sizeof(HuffCode), 1, &mp->codes[0].code, sizeof(HuffCode), 4, 0)) 293 goto end; 294 mp_decode_frame_helper(mp, &gb); 295 ff_free_vlc(&mp->vlc); 296 297end: 298 *data_size = sizeof(AVFrame); 299 *(AVFrame *)data = mp->frame; 300 return buf_size; 301} 302 303static av_cold int mp_decode_end(AVCodecContext *avctx) 304{ 305 MotionPixelsContext *mp = avctx->priv_data; 306 307 av_freep(&mp->changes_map); 308 av_freep(&mp->vpt); 309 av_freep(&mp->hpt); 310 av_freep(&mp->bswapbuf); 311 if (mp->frame.data[0]) 312 avctx->release_buffer(avctx, &mp->frame); 313 314 return 0; 315} 316 317AVCodec ff_motionpixels_decoder = { 318 .name = "motionpixels", 319 .type = AVMEDIA_TYPE_VIDEO, 320 .id = CODEC_ID_MOTIONPIXELS, 321 .priv_data_size = sizeof(MotionPixelsContext), 322 .init = mp_decode_init, 323 .close = mp_decode_end, 324 .decode = mp_decode_frame, 325 .capabilities = CODEC_CAP_DR1, 326 .long_name = NULL_IF_CONFIG_SMALL("Motion Pixels video"), 327}; 328