libavcodec/truemotion2.c
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00001 /*
00002  * Duck/ON2 TrueMotion 2 Decoder
00003  * Copyright (c) 2005 Konstantin Shishkov
00004  *
00005  * This file is part of Libav.
00006  *
00007  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00027 #include "avcodec.h"
00028 #include "get_bits.h"
00029 #include "dsputil.h"
00030 
00031 #define TM2_ESCAPE 0x80000000
00032 #define TM2_DELTAS 64
00033 /* Huffman-coded streams of different types of blocks */
00034 enum TM2_STREAMS{ TM2_C_HI = 0, TM2_C_LO, TM2_L_HI, TM2_L_LO,
00035      TM2_UPD, TM2_MOT, TM2_TYPE, TM2_NUM_STREAMS};
00036 /* Block types */
00037 enum TM2_BLOCKS{ TM2_HI_RES = 0, TM2_MED_RES, TM2_LOW_RES, TM2_NULL_RES,
00038                  TM2_UPDATE, TM2_STILL, TM2_MOTION};
00039 
00040 typedef struct TM2Context{
00041     AVCodecContext *avctx;
00042     AVFrame pic;
00043 
00044     GetBitContext gb;
00045     DSPContext dsp;
00046 
00047     /* TM2 streams */
00048     int *tokens[TM2_NUM_STREAMS];
00049     int tok_lens[TM2_NUM_STREAMS];
00050     int tok_ptrs[TM2_NUM_STREAMS];
00051     int deltas[TM2_NUM_STREAMS][TM2_DELTAS];
00052     /* for blocks decoding */
00053     int D[4];
00054     int CD[4];
00055     int *last;
00056     int *clast;
00057 
00058     /* data for current and previous frame */
00059     int *Y1, *U1, *V1, *Y2, *U2, *V2;
00060     int cur;
00061 } TM2Context;
00062 
00066 typedef struct TM2Codes{
00067     VLC vlc; 
00068     int bits;
00069     int *recode; 
00070     int length;
00071 } TM2Codes;
00072 
00076 typedef struct TM2Huff{
00077     int val_bits; 
00078     int max_bits; 
00079     int min_bits; 
00080     int nodes; 
00081     int num; 
00082     int max_num; 
00083     int *nums; 
00084     uint32_t *bits; 
00085     int *lens; 
00086 } TM2Huff;
00087 
00088 static int tm2_read_tree(TM2Context *ctx, uint32_t prefix, int length, TM2Huff *huff)
00089 {
00090     if(length > huff->max_bits) {
00091         av_log(ctx->avctx, AV_LOG_ERROR, "Tree exceeded its given depth (%i)\n", huff->max_bits);
00092         return -1;
00093     }
00094 
00095     if(!get_bits1(&ctx->gb)) { /* literal */
00096         if (length == 0) {
00097             length = 1;
00098         }
00099         if(huff->num >= huff->max_num) {
00100             av_log(ctx->avctx, AV_LOG_DEBUG, "Too many literals\n");
00101             return -1;
00102         }
00103         huff->nums[huff->num] = get_bits_long(&ctx->gb, huff->val_bits);
00104         huff->bits[huff->num] = prefix;
00105         huff->lens[huff->num] = length;
00106         huff->num++;
00107         return 0;
00108     } else { /* non-terminal node */
00109         if(tm2_read_tree(ctx, prefix << 1, length + 1, huff) == -1)
00110             return -1;
00111         if(tm2_read_tree(ctx, (prefix << 1) | 1, length + 1, huff) == -1)
00112             return -1;
00113     }
00114     return 0;
00115 }
00116 
00117 static int tm2_build_huff_table(TM2Context *ctx, TM2Codes *code)
00118 {
00119     TM2Huff huff;
00120     int res = 0;
00121 
00122     huff.val_bits = get_bits(&ctx->gb, 5);
00123     huff.max_bits = get_bits(&ctx->gb, 5);
00124     huff.min_bits = get_bits(&ctx->gb, 5);
00125     huff.nodes = get_bits_long(&ctx->gb, 17);
00126     huff.num = 0;
00127 
00128     /* check for correct codes parameters */
00129     if((huff.val_bits < 1) || (huff.val_bits > 32) ||
00130        (huff.max_bits < 0) || (huff.max_bits > 32)) {
00131         av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect tree parameters - literal length: %i, max code length: %i\n",
00132                huff.val_bits, huff.max_bits);
00133         return -1;
00134     }
00135     if((huff.nodes <= 0) || (huff.nodes > 0x10000)) {
00136         av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of Huffman tree nodes: %i\n", huff.nodes);
00137         return -1;
00138     }
00139     /* one-node tree */
00140     if(huff.max_bits == 0)
00141         huff.max_bits = 1;
00142 
00143     /* allocate space for codes - it is exactly ceil(nodes / 2) entries */
00144     huff.max_num = (huff.nodes + 1) >> 1;
00145     huff.nums = av_mallocz(huff.max_num * sizeof(int));
00146     huff.bits = av_mallocz(huff.max_num * sizeof(uint32_t));
00147     huff.lens = av_mallocz(huff.max_num * sizeof(int));
00148 
00149     if(tm2_read_tree(ctx, 0, 0, &huff) == -1)
00150         res = -1;
00151 
00152     if(huff.num != huff.max_num) {
00153         av_log(ctx->avctx, AV_LOG_ERROR, "Got less codes than expected: %i of %i\n",
00154                huff.num, huff.max_num);
00155         res = -1;
00156     }
00157 
00158     /* convert codes to vlc_table */
00159     if(res != -1) {
00160         int i;
00161 
00162         res = init_vlc(&code->vlc, huff.max_bits, huff.max_num,
00163                     huff.lens, sizeof(int), sizeof(int),
00164                     huff.bits, sizeof(uint32_t), sizeof(uint32_t), 0);
00165         if(res < 0) {
00166             av_log(ctx->avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
00167             res = -1;
00168         } else
00169             res = 0;
00170         if(res != -1) {
00171             code->bits = huff.max_bits;
00172             code->length = huff.max_num;
00173             code->recode = av_malloc(code->length * sizeof(int));
00174             for(i = 0; i < code->length; i++)
00175                 code->recode[i] = huff.nums[i];
00176         }
00177     }
00178     /* free allocated memory */
00179     av_free(huff.nums);
00180     av_free(huff.bits);
00181     av_free(huff.lens);
00182 
00183     return res;
00184 }
00185 
00186 static void tm2_free_codes(TM2Codes *code)
00187 {
00188     av_free(code->recode);
00189     if(code->vlc.table)
00190         free_vlc(&code->vlc);
00191 }
00192 
00193 static inline int tm2_get_token(GetBitContext *gb, TM2Codes *code)
00194 {
00195     int val;
00196     val = get_vlc2(gb, code->vlc.table, code->bits, 1);
00197     return code->recode[val];
00198 }
00199 
00200 static inline int tm2_read_header(TM2Context *ctx, const uint8_t *buf)
00201 {
00202     uint32_t magic;
00203     const uint8_t *obuf;
00204 
00205     obuf = buf;
00206 
00207     magic = AV_RL32(buf);
00208     buf += 4;
00209 
00210     if(magic == 0x00000100) { /* old header */
00211 /*      av_log (ctx->avctx, AV_LOG_ERROR, "TM2 old header: not implemented (yet)\n"); */
00212         return 40;
00213     } else if(magic == 0x00000101) { /* new header */
00214         return 40;
00215     } else {
00216         av_log (ctx->avctx, AV_LOG_ERROR, "Not a TM2 header: 0x%08X\n", magic);
00217         return -1;
00218     }
00219 
00220     return buf - obuf;
00221 }
00222 
00223 static int tm2_read_deltas(TM2Context *ctx, int stream_id) {
00224     int d, mb;
00225     int i, v;
00226 
00227     d = get_bits(&ctx->gb, 9);
00228     mb = get_bits(&ctx->gb, 5);
00229 
00230     if((d < 1) || (d > TM2_DELTAS) || (mb < 1) || (mb > 32)) {
00231         av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect delta table: %i deltas x %i bits\n", d, mb);
00232         return -1;
00233     }
00234 
00235     for(i = 0; i < d; i++) {
00236         v = get_bits_long(&ctx->gb, mb);
00237         if(v & (1 << (mb - 1)))
00238             ctx->deltas[stream_id][i] = v - (1 << mb);
00239         else
00240             ctx->deltas[stream_id][i] = v;
00241     }
00242     for(; i < TM2_DELTAS; i++)
00243         ctx->deltas[stream_id][i] = 0;
00244 
00245     return 0;
00246 }
00247 
00248 static int tm2_read_stream(TM2Context *ctx, const uint8_t *buf, int stream_id, int buf_size)
00249 {
00250     int i;
00251     int cur = 0;
00252     int skip = 0;
00253     int len, toks;
00254     TM2Codes codes;
00255 
00256     /* get stream length in dwords */
00257     len = AV_RB32(buf); buf += 4; cur += 4;
00258     skip = len * 4 + 4;
00259 
00260     if(len == 0)
00261         return 4;
00262 
00263     if (len >= INT_MAX/4-1 || len < 0 || len > buf_size) {
00264         av_log(ctx->avctx, AV_LOG_ERROR, "Error, invalid stream size.\n");
00265         return -1;
00266     }
00267 
00268     toks = AV_RB32(buf); buf += 4; cur += 4;
00269     if(toks & 1) {
00270         len = AV_RB32(buf); buf += 4; cur += 4;
00271         if(len == TM2_ESCAPE) {
00272             len = AV_RB32(buf); buf += 4; cur += 4;
00273         }
00274         if(len > 0) {
00275             if (skip <= cur)
00276                 return -1;
00277             init_get_bits(&ctx->gb, buf, (skip - cur) * 8);
00278             if(tm2_read_deltas(ctx, stream_id) == -1)
00279                 return -1;
00280             buf += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
00281             cur += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
00282         }
00283     }
00284     /* skip unused fields */
00285     if(AV_RB32(buf) == TM2_ESCAPE) {
00286         buf += 4; cur += 4; /* some unknown length - could be escaped too */
00287     }
00288     buf += 4; cur += 4;
00289     buf += 4; cur += 4; /* unused by decoder */
00290 
00291     if (skip <= cur)
00292         return -1;
00293     init_get_bits(&ctx->gb, buf, (skip - cur) * 8);
00294     if(tm2_build_huff_table(ctx, &codes) == -1)
00295         return -1;
00296     buf += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
00297     cur += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
00298 
00299     toks >>= 1;
00300     /* check if we have sane number of tokens */
00301     if((toks < 0) || (toks > 0xFFFFFF)){
00302         av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of tokens: %i\n", toks);
00303         tm2_free_codes(&codes);
00304         return -1;
00305     }
00306     ctx->tokens[stream_id] = av_realloc(ctx->tokens[stream_id], toks * sizeof(int));
00307     ctx->tok_lens[stream_id] = toks;
00308     len = AV_RB32(buf); buf += 4; cur += 4;
00309     if(len > 0) {
00310         if (skip <= cur)
00311             return -1;
00312         init_get_bits(&ctx->gb, buf, (skip - cur) * 8);
00313         for(i = 0; i < toks; i++) {
00314             if (get_bits_left(&ctx->gb) <= 0) {
00315                 av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of tokens: %i\n", toks);
00316                 return -1;
00317             }
00318             ctx->tokens[stream_id][i] = tm2_get_token(&ctx->gb, &codes);
00319         }
00320     } else {
00321         for(i = 0; i < toks; i++)
00322             ctx->tokens[stream_id][i] = codes.recode[0];
00323     }
00324     tm2_free_codes(&codes);
00325 
00326     return skip;
00327 }
00328 
00329 static inline int GET_TOK(TM2Context *ctx,int type) {
00330     if(ctx->tok_ptrs[type] >= ctx->tok_lens[type]) {
00331         av_log(ctx->avctx, AV_LOG_ERROR, "Read token from stream %i out of bounds (%i>=%i)\n", type, ctx->tok_ptrs[type], ctx->tok_lens[type]);
00332         return 0;
00333     }
00334     if(type <= TM2_MOT)
00335         return ctx->deltas[type][ctx->tokens[type][ctx->tok_ptrs[type]++]];
00336     return ctx->tokens[type][ctx->tok_ptrs[type]++];
00337 }
00338 
00339 /* blocks decoding routines */
00340 
00341 /* common Y, U, V pointers initialisation */
00342 #define TM2_INIT_POINTERS() \
00343     int *last, *clast; \
00344     int *Y, *U, *V;\
00345     int Ystride, Ustride, Vstride;\
00346 \
00347     Ystride = ctx->avctx->width;\
00348     Vstride = (ctx->avctx->width + 1) >> 1;\
00349     Ustride = (ctx->avctx->width + 1) >> 1;\
00350     Y = (ctx->cur?ctx->Y2:ctx->Y1) + by * 4 * Ystride + bx * 4;\
00351     V = (ctx->cur?ctx->V2:ctx->V1) + by * 2 * Vstride + bx * 2;\
00352     U = (ctx->cur?ctx->U2:ctx->U1) + by * 2 * Ustride + bx * 2;\
00353     last = ctx->last + bx * 4;\
00354     clast = ctx->clast + bx * 4;
00355 
00356 #define TM2_INIT_POINTERS_2() \
00357     int *Yo, *Uo, *Vo;\
00358     int oYstride, oUstride, oVstride;\
00359 \
00360     TM2_INIT_POINTERS();\
00361     oYstride = Ystride;\
00362     oVstride = Vstride;\
00363     oUstride = Ustride;\
00364     Yo = (ctx->cur?ctx->Y1:ctx->Y2) + by * 4 * oYstride + bx * 4;\
00365     Vo = (ctx->cur?ctx->V1:ctx->V2) + by * 2 * oVstride + bx * 2;\
00366     Uo = (ctx->cur?ctx->U1:ctx->U2) + by * 2 * oUstride + bx * 2;
00367 
00368 /* recalculate last and delta values for next blocks */
00369 #define TM2_RECALC_BLOCK(CHR, stride, last, CD) {\
00370     CD[0] = CHR[1] - last[1];\
00371     CD[1] = (int)CHR[stride + 1] - (int)CHR[1];\
00372     last[0] = (int)CHR[stride + 0];\
00373     last[1] = (int)CHR[stride + 1];}
00374 
00375 /* common operations - add deltas to 4x4 block of luma or 2x2 blocks of chroma */
00376 static inline void tm2_apply_deltas(TM2Context *ctx, int* Y, int stride, int *deltas, int *last)
00377 {
00378     int ct, d;
00379     int i, j;
00380 
00381     for(j = 0; j < 4; j++){
00382         ct = ctx->D[j];
00383         for(i = 0; i < 4; i++){
00384             d = deltas[i + j * 4];
00385             ct += d;
00386             last[i] += ct;
00387             Y[i] = av_clip_uint8(last[i]);
00388         }
00389         Y += stride;
00390         ctx->D[j] = ct;
00391     }
00392 }
00393 
00394 static inline void tm2_high_chroma(int *data, int stride, int *last, int *CD, int *deltas)
00395 {
00396     int i, j;
00397     for(j = 0; j < 2; j++){
00398         for(i = 0; i < 2; i++){
00399             CD[j] += deltas[i + j * 2];
00400             last[i] += CD[j];
00401             data[i] = last[i];
00402         }
00403         data += stride;
00404     }
00405 }
00406 
00407 static inline void tm2_low_chroma(int *data, int stride, int *clast, int *CD, int *deltas, int bx)
00408 {
00409     int t;
00410     int l;
00411     int prev;
00412 
00413     if(bx > 0)
00414         prev = clast[-3];
00415     else
00416         prev = 0;
00417     t = (CD[0] + CD[1]) >> 1;
00418     l = (prev - CD[0] - CD[1] + clast[1]) >> 1;
00419     CD[1] = CD[0] + CD[1] - t;
00420     CD[0] = t;
00421     clast[0] = l;
00422 
00423     tm2_high_chroma(data, stride, clast, CD, deltas);
00424 }
00425 
00426 static inline void tm2_hi_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
00427 {
00428     int i;
00429     int deltas[16];
00430     TM2_INIT_POINTERS();
00431 
00432     /* hi-res chroma */
00433     for(i = 0; i < 4; i++) {
00434         deltas[i] = GET_TOK(ctx, TM2_C_HI);
00435         deltas[i + 4] = GET_TOK(ctx, TM2_C_HI);
00436     }
00437     tm2_high_chroma(U, Ustride, clast, ctx->CD, deltas);
00438     tm2_high_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas + 4);
00439 
00440     /* hi-res luma */
00441     for(i = 0; i < 16; i++)
00442         deltas[i] = GET_TOK(ctx, TM2_L_HI);
00443 
00444     tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
00445 }
00446 
00447 static inline void tm2_med_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
00448 {
00449     int i;
00450     int deltas[16];
00451     TM2_INIT_POINTERS();
00452 
00453     /* low-res chroma */
00454     deltas[0] = GET_TOK(ctx, TM2_C_LO);
00455     deltas[1] = deltas[2] = deltas[3] = 0;
00456     tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
00457 
00458     deltas[0] = GET_TOK(ctx, TM2_C_LO);
00459     deltas[1] = deltas[2] = deltas[3] = 0;
00460     tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
00461 
00462     /* hi-res luma */
00463     for(i = 0; i < 16; i++)
00464         deltas[i] = GET_TOK(ctx, TM2_L_HI);
00465 
00466     tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
00467 }
00468 
00469 static inline void tm2_low_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
00470 {
00471     int i;
00472     int t1, t2;
00473     int deltas[16];
00474     TM2_INIT_POINTERS();
00475 
00476     /* low-res chroma */
00477     deltas[0] = GET_TOK(ctx, TM2_C_LO);
00478     deltas[1] = deltas[2] = deltas[3] = 0;
00479     tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
00480 
00481     deltas[0] = GET_TOK(ctx, TM2_C_LO);
00482     deltas[1] = deltas[2] = deltas[3] = 0;
00483     tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
00484 
00485     /* low-res luma */
00486     for(i = 0; i < 16; i++)
00487         deltas[i] = 0;
00488 
00489     deltas[ 0] = GET_TOK(ctx, TM2_L_LO);
00490     deltas[ 2] = GET_TOK(ctx, TM2_L_LO);
00491     deltas[ 8] = GET_TOK(ctx, TM2_L_LO);
00492     deltas[10] = GET_TOK(ctx, TM2_L_LO);
00493 
00494     if(bx > 0)
00495         last[0] = (last[-1] - ctx->D[0] - ctx->D[1] - ctx->D[2] - ctx->D[3] + last[1]) >> 1;
00496     else
00497         last[0] = (last[1]  - ctx->D[0] - ctx->D[1] - ctx->D[2] - ctx->D[3])>> 1;
00498     last[2] = (last[1] + last[3]) >> 1;
00499 
00500     t1 = ctx->D[0] + ctx->D[1];
00501     ctx->D[0] = t1 >> 1;
00502     ctx->D[1] = t1 - (t1 >> 1);
00503     t2 = ctx->D[2] + ctx->D[3];
00504     ctx->D[2] = t2 >> 1;
00505     ctx->D[3] = t2 - (t2 >> 1);
00506 
00507     tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
00508 }
00509 
00510 static inline void tm2_null_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
00511 {
00512     int i;
00513     int ct;
00514     int left, right, diff;
00515     int deltas[16];
00516     TM2_INIT_POINTERS();
00517 
00518     /* null chroma */
00519     deltas[0] = deltas[1] = deltas[2] = deltas[3] = 0;
00520     tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
00521 
00522     deltas[0] = deltas[1] = deltas[2] = deltas[3] = 0;
00523     tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
00524 
00525     /* null luma */
00526     for(i = 0; i < 16; i++)
00527         deltas[i] = 0;
00528 
00529     ct = ctx->D[0] + ctx->D[1] + ctx->D[2] + ctx->D[3];
00530 
00531     if(bx > 0)
00532         left = last[-1] - ct;
00533     else
00534         left = 0;
00535 
00536     right = last[3];
00537     diff = right - left;
00538     last[0] = left + (diff >> 2);
00539     last[1] = left + (diff >> 1);
00540     last[2] = right - (diff >> 2);
00541     last[3] = right;
00542     {
00543         int tp = left;
00544 
00545         ctx->D[0] = (tp + (ct >> 2)) - left;
00546         left += ctx->D[0];
00547         ctx->D[1] = (tp + (ct >> 1)) - left;
00548         left += ctx->D[1];
00549         ctx->D[2] = ((tp + ct) - (ct >> 2)) - left;
00550         left += ctx->D[2];
00551         ctx->D[3] = (tp + ct) - left;
00552     }
00553     tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
00554 }
00555 
00556 static inline void tm2_still_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
00557 {
00558     int i, j;
00559     TM2_INIT_POINTERS_2();
00560 
00561     /* update chroma */
00562     for(j = 0; j < 2; j++){
00563         for(i = 0; i < 2; i++){
00564             U[i] = Uo[i];
00565             V[i] = Vo[i];
00566         }
00567         U += Ustride; V += Vstride;
00568         Uo += oUstride; Vo += oVstride;
00569     }
00570     U -= Ustride * 2;
00571     V -= Vstride * 2;
00572     TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
00573     TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
00574 
00575     /* update deltas */
00576     ctx->D[0] = Yo[3] - last[3];
00577     ctx->D[1] = Yo[3 + oYstride] - Yo[3];
00578     ctx->D[2] = Yo[3 + oYstride * 2] - Yo[3 + oYstride];
00579     ctx->D[3] = Yo[3 + oYstride * 3] - Yo[3 + oYstride * 2];
00580 
00581     for(j = 0; j < 4; j++){
00582         for(i = 0; i < 4; i++){
00583             Y[i] = Yo[i];
00584             last[i] = Yo[i];
00585         }
00586         Y += Ystride;
00587         Yo += oYstride;
00588     }
00589 }
00590 
00591 static inline void tm2_update_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
00592 {
00593     int i, j;
00594     int d;
00595     TM2_INIT_POINTERS_2();
00596 
00597     /* update chroma */
00598     for(j = 0; j < 2; j++){
00599         for(i = 0; i < 2; i++){
00600             U[i] = Uo[i] + GET_TOK(ctx, TM2_UPD);
00601             V[i] = Vo[i] + GET_TOK(ctx, TM2_UPD);
00602         }
00603         U += Ustride; V += Vstride;
00604         Uo += oUstride; Vo += oVstride;
00605     }
00606     U -= Ustride * 2;
00607     V -= Vstride * 2;
00608     TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
00609     TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
00610 
00611     /* update deltas */
00612     ctx->D[0] = Yo[3] - last[3];
00613     ctx->D[1] = Yo[3 + oYstride] - Yo[3];
00614     ctx->D[2] = Yo[3 + oYstride * 2] - Yo[3 + oYstride];
00615     ctx->D[3] = Yo[3 + oYstride * 3] - Yo[3 + oYstride * 2];
00616 
00617     for(j = 0; j < 4; j++){
00618         d = last[3];
00619         for(i = 0; i < 4; i++){
00620             Y[i] = Yo[i] + GET_TOK(ctx, TM2_UPD);
00621             last[i] = Y[i];
00622         }
00623         ctx->D[j] = last[3] - d;
00624         Y += Ystride;
00625         Yo += oYstride;
00626     }
00627 }
00628 
00629 static inline void tm2_motion_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
00630 {
00631     int i, j;
00632     int mx, my;
00633     TM2_INIT_POINTERS_2();
00634 
00635     mx = GET_TOK(ctx, TM2_MOT);
00636     my = GET_TOK(ctx, TM2_MOT);
00637 
00638     Yo += my * oYstride + mx;
00639     Uo += (my >> 1) * oUstride + (mx >> 1);
00640     Vo += (my >> 1) * oVstride + (mx >> 1);
00641 
00642     /* copy chroma */
00643     for(j = 0; j < 2; j++){
00644         for(i = 0; i < 2; i++){
00645             U[i] = Uo[i];
00646             V[i] = Vo[i];
00647         }
00648         U += Ustride; V += Vstride;
00649         Uo += oUstride; Vo += oVstride;
00650     }
00651     U -= Ustride * 2;
00652     V -= Vstride * 2;
00653     TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
00654     TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
00655 
00656     /* copy luma */
00657     for(j = 0; j < 4; j++){
00658         for(i = 0; i < 4; i++){
00659             Y[i] = Yo[i];
00660         }
00661         Y += Ystride;
00662         Yo += oYstride;
00663     }
00664     /* calculate deltas */
00665     Y -= Ystride * 4;
00666     ctx->D[0] = Y[3] - last[3];
00667     ctx->D[1] = Y[3 + Ystride] - Y[3];
00668     ctx->D[2] = Y[3 + Ystride * 2] - Y[3 + Ystride];
00669     ctx->D[3] = Y[3 + Ystride * 3] - Y[3 + Ystride * 2];
00670     for(i = 0; i < 4; i++)
00671         last[i] = Y[i + Ystride * 3];
00672 }
00673 
00674 static int tm2_decode_blocks(TM2Context *ctx, AVFrame *p)
00675 {
00676     int i, j;
00677     int bw, bh;
00678     int type;
00679     int keyframe = 1;
00680     int *Y, *U, *V;
00681     uint8_t *dst;
00682 
00683     bw = ctx->avctx->width >> 2;
00684     bh = ctx->avctx->height >> 2;
00685 
00686     for(i = 0; i < TM2_NUM_STREAMS; i++)
00687         ctx->tok_ptrs[i] = 0;
00688 
00689     if (ctx->tok_lens[TM2_TYPE]<bw*bh){
00690         av_log(ctx->avctx,AV_LOG_ERROR,"Got %i tokens for %i blocks\n",ctx->tok_lens[TM2_TYPE],bw*bh);
00691         return -1;
00692     }
00693 
00694     memset(ctx->last, 0, 4 * bw * sizeof(int));
00695     memset(ctx->clast, 0, 4 * bw * sizeof(int));
00696 
00697     for(j = 0; j < bh; j++) {
00698         memset(ctx->D, 0, 4 * sizeof(int));
00699         memset(ctx->CD, 0, 4 * sizeof(int));
00700         for(i = 0; i < bw; i++) {
00701             type = GET_TOK(ctx, TM2_TYPE);
00702             switch(type) {
00703             case TM2_HI_RES:
00704                 tm2_hi_res_block(ctx, p, i, j);
00705                 break;
00706             case TM2_MED_RES:
00707                 tm2_med_res_block(ctx, p, i, j);
00708                 break;
00709             case TM2_LOW_RES:
00710                 tm2_low_res_block(ctx, p, i, j);
00711                 break;
00712             case TM2_NULL_RES:
00713                 tm2_null_res_block(ctx, p, i, j);
00714                 break;
00715             case TM2_UPDATE:
00716                 tm2_update_block(ctx, p, i, j);
00717                 keyframe = 0;
00718                 break;
00719             case TM2_STILL:
00720                 tm2_still_block(ctx, p, i, j);
00721                 keyframe = 0;
00722                 break;
00723             case TM2_MOTION:
00724                 tm2_motion_block(ctx, p, i, j);
00725                 keyframe = 0;
00726                 break;
00727             default:
00728                 av_log(ctx->avctx, AV_LOG_ERROR, "Skipping unknown block type %i\n", type);
00729             }
00730         }
00731     }
00732 
00733     /* copy data from our buffer to AVFrame */
00734     Y = (ctx->cur?ctx->Y2:ctx->Y1);
00735     U = (ctx->cur?ctx->U2:ctx->U1);
00736     V = (ctx->cur?ctx->V2:ctx->V1);
00737     dst = p->data[0];
00738     for(j = 0; j < ctx->avctx->height; j++){
00739         for(i = 0; i < ctx->avctx->width; i++){
00740             int y = Y[i], u = U[i >> 1], v = V[i >> 1];
00741             dst[3*i+0] = av_clip_uint8(y + v);
00742             dst[3*i+1] = av_clip_uint8(y);
00743             dst[3*i+2] = av_clip_uint8(y + u);
00744         }
00745         Y += ctx->avctx->width;
00746         if (j & 1) {
00747             U += ctx->avctx->width >> 1;
00748             V += ctx->avctx->width >> 1;
00749         }
00750         dst += p->linesize[0];
00751     }
00752 
00753     return keyframe;
00754 }
00755 
00756 static const int tm2_stream_order[TM2_NUM_STREAMS] = {
00757     TM2_C_HI, TM2_C_LO, TM2_L_HI, TM2_L_LO, TM2_UPD, TM2_MOT, TM2_TYPE
00758 };
00759 
00760 static int decode_frame(AVCodecContext *avctx,
00761                         void *data, int *data_size,
00762                         AVPacket *avpkt)
00763 {
00764     const uint8_t *buf = avpkt->data;
00765     int buf_size = avpkt->size;
00766     TM2Context * const l = avctx->priv_data;
00767     AVFrame * const p= (AVFrame*)&l->pic;
00768     int i, skip, t;
00769     uint8_t *swbuf;
00770 
00771     swbuf = av_malloc(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
00772     if(!swbuf){
00773         av_log(avctx, AV_LOG_ERROR, "Cannot allocate temporary buffer\n");
00774         return -1;
00775     }
00776     p->reference = 1;
00777     p->buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
00778     if(avctx->reget_buffer(avctx, p) < 0){
00779         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00780         av_free(swbuf);
00781         return -1;
00782     }
00783 
00784     l->dsp.bswap_buf((uint32_t*)swbuf, (const uint32_t*)buf, buf_size >> 2);
00785     skip = tm2_read_header(l, swbuf);
00786 
00787     if(skip == -1){
00788         av_free(swbuf);
00789         return -1;
00790     }
00791 
00792     for(i = 0; i < TM2_NUM_STREAMS; i++){
00793         t = tm2_read_stream(l, swbuf + skip, tm2_stream_order[i], buf_size);
00794         if(t == -1){
00795             av_free(swbuf);
00796             return -1;
00797         }
00798         skip += t;
00799     }
00800     p->key_frame = tm2_decode_blocks(l, p);
00801     if(p->key_frame)
00802         p->pict_type = AV_PICTURE_TYPE_I;
00803     else
00804         p->pict_type = AV_PICTURE_TYPE_P;
00805 
00806     l->cur = !l->cur;
00807     *data_size = sizeof(AVFrame);
00808     *(AVFrame*)data = l->pic;
00809     av_free(swbuf);
00810 
00811     return buf_size;
00812 }
00813 
00814 static av_cold int decode_init(AVCodecContext *avctx){
00815     TM2Context * const l = avctx->priv_data;
00816     int i;
00817 
00818     if((avctx->width & 3) || (avctx->height & 3)){
00819         av_log(avctx, AV_LOG_ERROR, "Width and height must be multiple of 4\n");
00820         return -1;
00821     }
00822 
00823     l->avctx = avctx;
00824     l->pic.data[0]=NULL;
00825     avctx->pix_fmt = PIX_FMT_BGR24;
00826 
00827     dsputil_init(&l->dsp, avctx);
00828 
00829     l->last = av_malloc(4 * sizeof(int) * (avctx->width >> 2));
00830     l->clast = av_malloc(4 * sizeof(int) * (avctx->width >> 2));
00831 
00832     for(i = 0; i < TM2_NUM_STREAMS; i++) {
00833         l->tokens[i] = NULL;
00834         l->tok_lens[i] = 0;
00835     }
00836 
00837     l->Y1 = av_malloc(sizeof(int) * avctx->width * avctx->height);
00838     l->U1 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));
00839     l->V1 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));
00840     l->Y2 = av_malloc(sizeof(int) * avctx->width * avctx->height);
00841     l->U2 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));
00842     l->V2 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));
00843     l->cur = 0;
00844 
00845     return 0;
00846 }
00847 
00848 static av_cold int decode_end(AVCodecContext *avctx){
00849     TM2Context * const l = avctx->priv_data;
00850     AVFrame *pic = &l->pic;
00851     int i;
00852 
00853     av_free(l->last);
00854     av_free(l->clast);
00855     for(i = 0; i < TM2_NUM_STREAMS; i++)
00856         av_free(l->tokens[i]);
00857     if(l->Y1){
00858         av_free(l->Y1);
00859         av_free(l->U1);
00860         av_free(l->V1);
00861         av_free(l->Y2);
00862         av_free(l->U2);
00863         av_free(l->V2);
00864     }
00865 
00866     if (pic->data[0])
00867         avctx->release_buffer(avctx, pic);
00868 
00869     return 0;
00870 }
00871 
00872 AVCodec ff_truemotion2_decoder = {
00873     .name           = "truemotion2",
00874     .type           = AVMEDIA_TYPE_VIDEO,
00875     .id             = CODEC_ID_TRUEMOTION2,
00876     .priv_data_size = sizeof(TM2Context),
00877     .init           = decode_init,
00878     .close          = decode_end,
00879     .decode         = decode_frame,
00880     .capabilities   = CODEC_CAP_DR1,
00881     .long_name = NULL_IF_CONFIG_SMALL("Duck TrueMotion 2.0"),
00882 };