1/* 2 * Motion Pixels Video Decoder 3 * Copyright (c) 2008 Gregory Montoir (cyx@users.sourceforge.net) 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#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 56 motionpixels_tableinit(); 57 mp->avctx = avctx; 58 dsputil_init(&mp->dsp, avctx); 59 mp->changes_map = av_mallocz(avctx->width * avctx->height); 60 mp->offset_bits_len = av_log2(avctx->width * avctx->height) + 1; 61 mp->vpt = av_mallocz(avctx->height * sizeof(YuvPixel)); 62 mp->hpt = av_mallocz(avctx->height * avctx->width / 16 * sizeof(YuvPixel)); 63 avctx->pix_fmt = PIX_FMT_RGB555; 64 return 0; 65} 66 67static void mp_read_changes_map(MotionPixelsContext *mp, GetBitContext *gb, int count, int bits_len, int read_color) 68{ 69 uint16_t *pixels; 70 int offset, w, h, color = 0, x, y, i; 71 72 while (count--) { 73 offset = get_bits_long(gb, mp->offset_bits_len); 74 w = get_bits(gb, bits_len) + 1; 75 h = get_bits(gb, bits_len) + 1; 76 if (read_color) 77 color = get_bits(gb, 15); 78 x = offset % mp->avctx->width; 79 y = offset / mp->avctx->width; 80 if (y >= mp->avctx->height) 81 continue; 82 w = FFMIN(w, mp->avctx->width - x); 83 h = FFMIN(h, mp->avctx->height - y); 84 pixels = (uint16_t *)&mp->frame.data[0][y * mp->frame.linesize[0] + x * 2]; 85 while (h--) { 86 mp->changes_map[offset] = w; 87 if (read_color) 88 for (i = 0; i < w; ++i) 89 pixels[i] = color; 90 offset += mp->avctx->width; 91 pixels += mp->frame.linesize[0] / 2; 92 } 93 } 94} 95 96static void mp_get_code(MotionPixelsContext *mp, GetBitContext *gb, int size, int code) 97{ 98 while (get_bits1(gb)) { 99 ++size; 100 if (size > mp->max_codes_bits) { 101 av_log(mp->avctx, AV_LOG_ERROR, "invalid code size %d/%d\n", size, mp->max_codes_bits); 102 return; 103 } 104 code <<= 1; 105 mp_get_code(mp, gb, size, code + 1); 106 } 107 if (mp->current_codes_count >= MAX_HUFF_CODES) { 108 av_log(mp->avctx, AV_LOG_ERROR, "too many codes\n"); 109 return; 110 } 111 mp->codes[mp->current_codes_count ].code = code; 112 mp->codes[mp->current_codes_count++].size = size; 113} 114 115static void mp_read_codes_table(MotionPixelsContext *mp, GetBitContext *gb) 116{ 117 if (mp->codes_count == 1) { 118 mp->codes[0].delta = get_bits(gb, 4); 119 } else { 120 int i; 121 122 mp->max_codes_bits = get_bits(gb, 4); 123 for (i = 0; i < mp->codes_count; ++i) 124 mp->codes[i].delta = get_bits(gb, 4); 125 mp->current_codes_count = 0; 126 mp_get_code(mp, gb, 0, 0); 127 } 128} 129 130static int mp_gradient(MotionPixelsContext *mp, int component, int v) 131{ 132 int delta; 133 134 delta = (v - 7) * mp->gradient_scale[component]; 135 mp->gradient_scale[component] = (v == 0 || v == 14) ? 2 : 1; 136 return delta; 137} 138 139static YuvPixel mp_get_yuv_from_rgb(MotionPixelsContext *mp, int x, int y) 140{ 141 int color; 142 143 color = *(uint16_t *)&mp->frame.data[0][y * mp->frame.linesize[0] + x * 2]; 144 return mp_rgb_yuv_table[color]; 145} 146 147static void mp_set_rgb_from_yuv(MotionPixelsContext *mp, int x, int y, const YuvPixel *p) 148{ 149 int color; 150 151 color = mp_yuv_to_rgb(p->y, p->v, p->u, 1); 152 *(uint16_t *)&mp->frame.data[0][y * mp->frame.linesize[0] + x * 2] = color; 153} 154 155static int mp_get_vlc(MotionPixelsContext *mp, GetBitContext *gb) 156{ 157 int i; 158 159 i = (mp->codes_count == 1) ? 0 : get_vlc2(gb, mp->vlc.table, mp->max_codes_bits, 1); 160 return mp->codes[i].delta; 161} 162 163static void mp_decode_line(MotionPixelsContext *mp, GetBitContext *gb, int y) 164{ 165 YuvPixel p; 166 const int y0 = y * mp->avctx->width; 167 int w, i, x = 0; 168 169 p = mp->vpt[y]; 170 if (mp->changes_map[y0 + x] == 0) { 171 memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale)); 172 ++x; 173 } 174 while (x < mp->avctx->width) { 175 w = mp->changes_map[y0 + x]; 176 if (w != 0) { 177 if ((y & 3) == 0) { 178 if (mp->changes_map[y0 + x + mp->avctx->width] < w || 179 mp->changes_map[y0 + x + mp->avctx->width * 2] < w || 180 mp->changes_map[y0 + x + mp->avctx->width * 3] < w) { 181 for (i = (x + 3) & ~3; i < x + w; i += 4) { 182 mp->hpt[((y / 4) * mp->avctx->width + i) / 4] = mp_get_yuv_from_rgb(mp, i, y); 183 } 184 } 185 } 186 x += w; 187 memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale)); 188 p = mp_get_yuv_from_rgb(mp, x - 1, y); 189 } else { 190 p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb)); 191 if ((x & 3) == 0) { 192 if ((y & 3) == 0) { 193 p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb)); 194 p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb)); 195 mp->hpt[((y / 4) * mp->avctx->width + x) / 4] = p; 196 } else { 197 p.v = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].v; 198 p.u = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].u; 199 } 200 } 201 mp_set_rgb_from_yuv(mp, x, y, &p); 202 ++x; 203 } 204 } 205} 206 207static void mp_decode_frame_helper(MotionPixelsContext *mp, GetBitContext *gb) 208{ 209 YuvPixel p; 210 int y, y0; 211 212 for (y = 0; y < mp->avctx->height; ++y) { 213 if (mp->changes_map[y * mp->avctx->width] != 0) { 214 memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale)); 215 p = mp_get_yuv_from_rgb(mp, 0, y); 216 } else { 217 p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb)); 218 if ((y & 3) == 0) { 219 p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb)); 220 p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb)); 221 } 222 mp->vpt[y] = p; 223 mp_set_rgb_from_yuv(mp, 0, y, &p); 224 } 225 } 226 for (y0 = 0; y0 < 2; ++y0) 227 for (y = y0; y < mp->avctx->height; y += 2) 228 mp_decode_line(mp, gb, y); 229} 230 231static int mp_decode_frame(AVCodecContext *avctx, 232 void *data, int *data_size, 233 AVPacket *avpkt) 234{ 235 const uint8_t *buf = avpkt->data; 236 int buf_size = avpkt->size; 237 MotionPixelsContext *mp = avctx->priv_data; 238 GetBitContext gb; 239 int i, count1, count2, sz; 240 241 mp->frame.reference = 1; 242 mp->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE; 243 if (avctx->reget_buffer(avctx, &mp->frame)) { 244 av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n"); 245 return -1; 246 } 247 248 /* le32 bitstream msb first */ 249 av_fast_malloc(&mp->bswapbuf, &mp->bswapbuf_size, buf_size + FF_INPUT_BUFFER_PADDING_SIZE); 250 if (!mp->bswapbuf) 251 return AVERROR(ENOMEM); 252 mp->dsp.bswap_buf((uint32_t *)mp->bswapbuf, (const uint32_t *)buf, buf_size / 4); 253 if (buf_size & 3) 254 memcpy(mp->bswapbuf + (buf_size & ~3), buf + (buf_size & ~3), buf_size & 3); 255 init_get_bits(&gb, mp->bswapbuf, buf_size * 8); 256 257 memset(mp->changes_map, 0, avctx->width * avctx->height); 258 for (i = !(avctx->extradata[1] & 2); i < 2; ++i) { 259 count1 = get_bits(&gb, 12); 260 count2 = get_bits(&gb, 12); 261 mp_read_changes_map(mp, &gb, count1, 8, i); 262 mp_read_changes_map(mp, &gb, count2, 4, i); 263 } 264 265 mp->codes_count = get_bits(&gb, 4); 266 if (mp->codes_count == 0) 267 goto end; 268 269 if (mp->changes_map[0] == 0) { 270 *(uint16_t *)mp->frame.data[0] = get_bits(&gb, 15); 271 mp->changes_map[0] = 1; 272 } 273 mp_read_codes_table(mp, &gb); 274 275 sz = get_bits(&gb, 18); 276 if (avctx->extradata[0] != 5) 277 sz += get_bits(&gb, 18); 278 if (sz == 0) 279 goto end; 280 281 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); 282 mp_decode_frame_helper(mp, &gb); 283 free_vlc(&mp->vlc); 284 285end: 286 *data_size = sizeof(AVFrame); 287 *(AVFrame *)data = mp->frame; 288 return buf_size; 289} 290 291static av_cold int mp_decode_end(AVCodecContext *avctx) 292{ 293 MotionPixelsContext *mp = avctx->priv_data; 294 295 av_freep(&mp->changes_map); 296 av_freep(&mp->vpt); 297 av_freep(&mp->hpt); 298 av_freep(&mp->bswapbuf); 299 if (mp->frame.data[0]) 300 avctx->release_buffer(avctx, &mp->frame); 301 302 return 0; 303} 304 305AVCodec motionpixels_decoder = { 306 "motionpixels", 307 AVMEDIA_TYPE_VIDEO, 308 CODEC_ID_MOTIONPIXELS, 309 sizeof(MotionPixelsContext), 310 mp_decode_init, 311 NULL, 312 mp_decode_end, 313 mp_decode_frame, 314 CODEC_CAP_DR1, 315 .long_name = NULL_IF_CONFIG_SMALL("Motion Pixels video"), 316}; 317