00001 /* 00002 * Motion Pixels Video Decoder 00003 * Copyright (c) 2008 Gregory Montoir (cyx@users.sourceforge.net) 00004 * 00005 * This file is part of FFmpeg. 00006 * 00007 * FFmpeg is free software; you can redistribute it and/or 00008 * modify it under the terms of the GNU Lesser General Public 00009 * License as published by the Free Software Foundation; either 00010 * version 2.1 of the License, or (at your option) any later version. 00011 * 00012 * FFmpeg is distributed in the hope that it will be useful, 00013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00015 * Lesser General Public License for more details. 00016 * 00017 * You should have received a copy of the GNU Lesser General Public 00018 * License along with FFmpeg; if not, write to the Free Software 00019 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00020 */ 00021 00022 #include "avcodec.h" 00023 #include "bitstream.h" 00024 #include "dsputil.h" 00025 00026 #define MAX_HUFF_CODES 16 00027 00028 typedef struct YuvPixel { 00029 int8_t y, v, u; 00030 } YuvPixel; 00031 00032 typedef struct HuffCode { 00033 int code; 00034 uint8_t size; 00035 uint8_t delta; 00036 } HuffCode; 00037 00038 typedef struct MotionPixelsContext { 00039 AVCodecContext *avctx; 00040 AVFrame frame; 00041 DSPContext dsp; 00042 uint8_t *changes_map; 00043 int offset_bits_len; 00044 int codes_count, current_codes_count; 00045 int max_codes_bits; 00046 HuffCode codes[MAX_HUFF_CODES]; 00047 VLC vlc; 00048 YuvPixel *vpt, *hpt; 00049 uint8_t gradient_scale[3]; 00050 uint8_t *bswapbuf; 00051 int bswapbuf_size; 00052 } MotionPixelsContext; 00053 00054 static YuvPixel mp_rgb_yuv_table[1 << 15]; 00055 00056 static int mp_yuv_to_rgb(int y, int v, int u, int clip_rgb) { 00057 static const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP; 00058 int r, g, b; 00059 00060 r = (1000 * y + 701 * v) / 1000; 00061 g = (1000 * y - 357 * v - 172 * u) / 1000; 00062 b = (1000 * y + 886 * u) / 1000; 00063 if (clip_rgb) 00064 return ((cm[r * 8] & 0xF8) << 7) | ((cm[g * 8] & 0xF8) << 2) | (cm[b * 8] >> 3); 00065 if ((unsigned)r < 32 && (unsigned)g < 32 && (unsigned)b < 32) 00066 return (r << 10) | (g << 5) | b; 00067 return 1 << 15; 00068 } 00069 00070 static void mp_set_zero_yuv(YuvPixel *p) 00071 { 00072 int i, j; 00073 00074 for (i = 0; i < 31; ++i) { 00075 for (j = 31; j > i; --j) 00076 if (!(p[j].u | p[j].v | p[j].y)) 00077 p[j] = p[j - 1]; 00078 for (j = 0; j < 31 - i; ++j) 00079 if (!(p[j].u | p[j].v | p[j].y)) 00080 p[j] = p[j + 1]; 00081 } 00082 } 00083 00084 static void mp_build_rgb_yuv_table(YuvPixel *p) 00085 { 00086 int y, v, u, i; 00087 00088 for (y = 0; y <= 31; ++y) 00089 for (v = -31; v <= 31; ++v) 00090 for (u = -31; u <= 31; ++u) { 00091 i = mp_yuv_to_rgb(y, v, u, 0); 00092 if (i < (1 << 15) && !(p[i].u | p[i].v | p[i].y)) { 00093 p[i].y = y; 00094 p[i].v = v; 00095 p[i].u = u; 00096 } 00097 } 00098 for (i = 0; i < 1024; ++i) 00099 mp_set_zero_yuv(p + i * 32); 00100 } 00101 00102 static av_cold int mp_decode_init(AVCodecContext *avctx) 00103 { 00104 MotionPixelsContext *mp = avctx->priv_data; 00105 00106 if (!mp_rgb_yuv_table[0].u) { 00107 mp_build_rgb_yuv_table(mp_rgb_yuv_table); 00108 } 00109 mp->avctx = avctx; 00110 dsputil_init(&mp->dsp, avctx); 00111 mp->changes_map = av_mallocz(avctx->width * avctx->height); 00112 mp->offset_bits_len = av_log2(avctx->width * avctx->height) + 1; 00113 mp->vpt = av_mallocz(avctx->height * sizeof(YuvPixel)); 00114 mp->hpt = av_mallocz(avctx->height * avctx->width / 16 * sizeof(YuvPixel)); 00115 return 0; 00116 } 00117 00118 static void mp_read_changes_map(MotionPixelsContext *mp, GetBitContext *gb, int count, int bits_len, int read_color) 00119 { 00120 uint16_t *pixels; 00121 int offset, w, h, color = 0, x, y, i; 00122 00123 while (count--) { 00124 offset = get_bits_long(gb, mp->offset_bits_len); 00125 w = get_bits(gb, bits_len) + 1; 00126 h = get_bits(gb, bits_len) + 1; 00127 if (read_color) 00128 color = get_bits(gb, 15); 00129 x = offset % mp->avctx->width; 00130 y = offset / mp->avctx->width; 00131 if (y >= mp->avctx->height) 00132 continue; 00133 w = FFMIN(w, mp->avctx->width - x); 00134 h = FFMIN(h, mp->avctx->height - y); 00135 pixels = (uint16_t *)&mp->frame.data[0][y * mp->frame.linesize[0] + x * 2]; 00136 while (h--) { 00137 mp->changes_map[offset] = w; 00138 if (read_color) 00139 for (i = 0; i < w; ++i) 00140 pixels[i] = color; 00141 offset += mp->avctx->width; 00142 pixels += mp->frame.linesize[0] / 2; 00143 } 00144 } 00145 } 00146 00147 static void mp_get_code(MotionPixelsContext *mp, GetBitContext *gb, int size, int code) 00148 { 00149 while (get_bits1(gb)) { 00150 ++size; 00151 if (size > mp->max_codes_bits) { 00152 av_log(mp->avctx, AV_LOG_ERROR, "invalid code size %d/%d\n", size, mp->max_codes_bits); 00153 return; 00154 } 00155 code <<= 1; 00156 mp_get_code(mp, gb, size, code + 1); 00157 } 00158 if (mp->current_codes_count >= MAX_HUFF_CODES) { 00159 av_log(mp->avctx, AV_LOG_ERROR, "too many codes\n"); 00160 return; 00161 } 00162 mp->codes[mp->current_codes_count ].code = code; 00163 mp->codes[mp->current_codes_count++].size = size; 00164 } 00165 00166 static void mp_read_codes_table(MotionPixelsContext *mp, GetBitContext *gb) 00167 { 00168 if (mp->codes_count == 1) { 00169 mp->codes[0].delta = get_bits(gb, 4); 00170 } else { 00171 int i; 00172 00173 mp->max_codes_bits = get_bits(gb, 4); 00174 for (i = 0; i < mp->codes_count; ++i) 00175 mp->codes[i].delta = get_bits(gb, 4); 00176 mp->current_codes_count = 0; 00177 mp_get_code(mp, gb, 0, 0); 00178 } 00179 } 00180 00181 static int mp_gradient(MotionPixelsContext *mp, int component, int v) 00182 { 00183 int delta; 00184 00185 delta = (v - 7) * mp->gradient_scale[component]; 00186 mp->gradient_scale[component] = (v == 0 || v == 14) ? 2 : 1; 00187 return delta; 00188 } 00189 00190 static YuvPixel mp_get_yuv_from_rgb(MotionPixelsContext *mp, int x, int y) 00191 { 00192 int color; 00193 00194 color = *(uint16_t *)&mp->frame.data[0][y * mp->frame.linesize[0] + x * 2]; 00195 return mp_rgb_yuv_table[color]; 00196 } 00197 00198 static void mp_set_rgb_from_yuv(MotionPixelsContext *mp, int x, int y, const YuvPixel *p) 00199 { 00200 int color; 00201 00202 color = mp_yuv_to_rgb(p->y, p->v, p->u, 1); 00203 *(uint16_t *)&mp->frame.data[0][y * mp->frame.linesize[0] + x * 2] = color; 00204 } 00205 00206 static int mp_get_vlc(MotionPixelsContext *mp, GetBitContext *gb) 00207 { 00208 int i; 00209 00210 i = (mp->codes_count == 1) ? 0 : get_vlc2(gb, mp->vlc.table, mp->max_codes_bits, 1); 00211 return mp->codes[i].delta; 00212 } 00213 00214 static void mp_decode_line(MotionPixelsContext *mp, GetBitContext *gb, int y) 00215 { 00216 YuvPixel p; 00217 const int y0 = y * mp->avctx->width; 00218 int w, i, x = 0; 00219 00220 p = mp->vpt[y]; 00221 if (mp->changes_map[y0 + x] == 0) { 00222 memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale)); 00223 ++x; 00224 } 00225 while (x < mp->avctx->width) { 00226 w = mp->changes_map[y0 + x]; 00227 if (w != 0) { 00228 if ((y & 3) == 0) { 00229 if (mp->changes_map[y0 + x + mp->avctx->width] < w || 00230 mp->changes_map[y0 + x + mp->avctx->width * 2] < w || 00231 mp->changes_map[y0 + x + mp->avctx->width * 3] < w) { 00232 for (i = (x + 3) & ~3; i < x + w; i += 4) { 00233 mp->hpt[((y / 4) * mp->avctx->width + i) / 4] = mp_get_yuv_from_rgb(mp, i, y); 00234 } 00235 } 00236 } 00237 x += w; 00238 memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale)); 00239 p = mp_get_yuv_from_rgb(mp, x - 1, y); 00240 } else { 00241 p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb)); 00242 p.y = av_clip(p.y, 0, 31); 00243 if ((x & 3) == 0) { 00244 if ((y & 3) == 0) { 00245 p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb)); 00246 p.v = av_clip(p.v, -32, 31); 00247 p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb)); 00248 p.u = av_clip(p.u, -32, 31); 00249 mp->hpt[((y / 4) * mp->avctx->width + x) / 4] = p; 00250 } else { 00251 p.v = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].v; 00252 p.u = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].u; 00253 } 00254 } 00255 mp_set_rgb_from_yuv(mp, x, y, &p); 00256 ++x; 00257 } 00258 } 00259 } 00260 00261 static void mp_decode_frame_helper(MotionPixelsContext *mp, GetBitContext *gb) 00262 { 00263 YuvPixel p; 00264 int y, y0; 00265 00266 for (y = 0; y < mp->avctx->height; ++y) { 00267 if (mp->changes_map[y * mp->avctx->width] != 0) { 00268 memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale)); 00269 p = mp_get_yuv_from_rgb(mp, 0, y); 00270 } else { 00271 p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb)); 00272 p.y = av_clip(p.y, 0, 31); 00273 if ((y & 3) == 0) { 00274 p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb)); 00275 p.v = av_clip(p.v, -32, 31); 00276 p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb)); 00277 p.u = av_clip(p.u, -32, 31); 00278 } 00279 mp->vpt[y] = p; 00280 mp_set_rgb_from_yuv(mp, 0, y, &p); 00281 } 00282 } 00283 for (y0 = 0; y0 < 2; ++y0) 00284 for (y = y0; y < mp->avctx->height; y += 2) 00285 mp_decode_line(mp, gb, y); 00286 } 00287 00288 static int mp_decode_frame(AVCodecContext *avctx, 00289 void *data, int *data_size, 00290 const uint8_t *buf, int buf_size) 00291 { 00292 MotionPixelsContext *mp = avctx->priv_data; 00293 GetBitContext gb; 00294 int i, count1, count2, sz; 00295 00296 mp->frame.reference = 1; 00297 mp->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE; 00298 if (avctx->reget_buffer(avctx, &mp->frame)) { 00299 av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n"); 00300 return -1; 00301 } 00302 00303 /* le32 bitstream msb first */ 00304 mp->bswapbuf = av_fast_realloc(mp->bswapbuf, &mp->bswapbuf_size, buf_size + FF_INPUT_BUFFER_PADDING_SIZE); 00305 mp->dsp.bswap_buf((uint32_t *)mp->bswapbuf, (const uint32_t *)buf, buf_size / 4); 00306 if (buf_size & 3) 00307 memcpy(mp->bswapbuf + (buf_size & ~3), buf + (buf_size & ~3), buf_size & 3); 00308 init_get_bits(&gb, mp->bswapbuf, buf_size * 8); 00309 00310 memset(mp->changes_map, 0, avctx->width * avctx->height); 00311 for (i = !(avctx->extradata[1] & 2); i < 2; ++i) { 00312 count1 = get_bits(&gb, 12); 00313 count2 = get_bits(&gb, 12); 00314 mp_read_changes_map(mp, &gb, count1, 8, i); 00315 mp_read_changes_map(mp, &gb, count2, 4, i); 00316 } 00317 00318 mp->codes_count = get_bits(&gb, 4); 00319 if (mp->codes_count == 0) 00320 goto end; 00321 00322 if (mp->changes_map[0] == 0) { 00323 *(uint16_t *)mp->frame.data[0] = get_bits(&gb, 15); 00324 mp->changes_map[0] = 1; 00325 } 00326 mp_read_codes_table(mp, &gb); 00327 00328 sz = get_bits(&gb, 18); 00329 if (avctx->extradata[0] != 5) 00330 sz += get_bits(&gb, 18); 00331 if (sz == 0) 00332 goto end; 00333 00334 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)) 00335 goto end; 00336 mp_decode_frame_helper(mp, &gb); 00337 free_vlc(&mp->vlc); 00338 00339 end: 00340 *data_size = sizeof(AVFrame); 00341 *(AVFrame *)data = mp->frame; 00342 return buf_size; 00343 } 00344 00345 static av_cold int mp_decode_end(AVCodecContext *avctx) 00346 { 00347 MotionPixelsContext *mp = avctx->priv_data; 00348 00349 av_freep(&mp->changes_map); 00350 av_freep(&mp->vpt); 00351 av_freep(&mp->hpt); 00352 av_freep(&mp->bswapbuf); 00353 if (mp->frame.data[0]) 00354 avctx->release_buffer(avctx, &mp->frame); 00355 00356 return 0; 00357 } 00358 00359 AVCodec motionpixels_decoder = { 00360 "motionpixels", 00361 CODEC_TYPE_VIDEO, 00362 CODEC_ID_MOTIONPIXELS, 00363 sizeof(MotionPixelsContext), 00364 mp_decode_init, 00365 NULL, 00366 mp_decode_end, 00367 mp_decode_frame, 00368 CODEC_CAP_DR1, 00369 .long_name = NULL_IF_CONFIG_SMALL("Motion Pixels video"), 00370 };