FFmpeg: libavcodec/truemotion2.c Source File

00001 /*
00002  * Duck/ON2 TrueMotion 2 Decoder
00003  * Copyright (c) 2005 Konstantin Shishkov
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 
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     if(code->recode)
00189         av_free(code->recode);
00190     if(code->vlc.table)
00191         free_vlc(&code->vlc);
00192 }
00193 
00194 static inline int tm2_get_token(GetBitContext *gb, TM2Codes *code)
00195 {
00196     int val;
00197     val = get_vlc2(gb, code->vlc.table, code->bits, 1);
00198     return code->recode[val];
00199 }
00200 
00201 static inline int tm2_read_header(TM2Context *ctx, const uint8_t *buf)
00202 {
00203     uint32_t magic;
00204     const uint8_t *obuf;
00205     int length;
00206 
00207     obuf = buf;
00208 
00209     magic = AV_RL32(buf);
00210     buf += 4;
00211 
00212     if(magic == 0x00000100) { /* old header */
00213 /*      av_log (ctx->avctx, AV_LOG_ERROR, "TM2 old header: not implemented (yet)\n"); */
00214         return 40;
00215     } else if(magic == 0x00000101) { /* new header */
00216         int w, h, size, flags, xr, yr;
00217 
00218         length = AV_RL32(buf);
00219         buf += 4;
00220 
00221         init_get_bits(&ctx->gb, buf, 32 * 8);
00222         size = get_bits_long(&ctx->gb, 31);
00223         h = get_bits(&ctx->gb, 15);
00224         w = get_bits(&ctx->gb, 15);
00225         flags = get_bits_long(&ctx->gb, 31);
00226         yr = get_bits(&ctx->gb, 9);
00227         xr = get_bits(&ctx->gb, 9);
00228 
00229         return 40;
00230     } else {
00231         av_log (ctx->avctx, AV_LOG_ERROR, "Not a TM2 header: 0x%08X\n", magic);
00232         return -1;
00233     }
00234 
00235     return buf - obuf;
00236 }
00237 
00238 static int tm2_read_deltas(TM2Context *ctx, int stream_id) {
00239     int d, mb;
00240     int i, v;
00241 
00242     d = get_bits(&ctx->gb, 9);
00243     mb = get_bits(&ctx->gb, 5);
00244 
00245     if((d < 1) || (d > TM2_DELTAS) || (mb < 1) || (mb > 32)) {
00246         av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect delta table: %i deltas x %i bits\n", d, mb);
00247         return -1;
00248     }
00249 
00250     for(i = 0; i < d; i++) {
00251         v = get_bits_long(&ctx->gb, mb);
00252         if(v & (1 << (mb - 1)))
00253             ctx->deltas[stream_id][i] = v - (1 << mb);
00254         else
00255             ctx->deltas[stream_id][i] = v;
00256     }
00257     for(; i < TM2_DELTAS; i++)
00258         ctx->deltas[stream_id][i] = 0;
00259 
00260     return 0;
00261 }
00262 
00263 static int tm2_read_stream(TM2Context *ctx, const uint8_t *buf, int stream_id) {
00264     int i;
00265     int cur = 0;
00266     int skip = 0;
00267     int len, toks;
00268     TM2Codes codes;
00269 
00270     /* get stream length in dwords */
00271     len = AV_RB32(buf); buf += 4; cur += 4;
00272     skip = len * 4 + 4;
00273 
00274     if(len == 0)
00275         return 4;
00276 
00277     toks = AV_RB32(buf); buf += 4; cur += 4;
00278     if(toks & 1) {
00279         len = AV_RB32(buf); buf += 4; cur += 4;
00280         if(len == TM2_ESCAPE) {
00281             len = AV_RB32(buf); buf += 4; cur += 4;
00282         }
00283         if(len > 0) {
00284             init_get_bits(&ctx->gb, buf, (skip - cur) * 8);
00285             if(tm2_read_deltas(ctx, stream_id) == -1)
00286                 return -1;
00287             buf += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
00288             cur += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
00289         }
00290     }
00291     /* skip unused fields */
00292     if(AV_RB32(buf) == TM2_ESCAPE) {
00293         buf += 4; cur += 4; /* some unknown length - could be escaped too */
00294     }
00295     buf += 4; cur += 4;
00296     buf += 4; cur += 4; /* unused by decoder */
00297 
00298     init_get_bits(&ctx->gb, buf, (skip - cur) * 8);
00299     if(tm2_build_huff_table(ctx, &codes) == -1)
00300         return -1;
00301     buf += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
00302     cur += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
00303 
00304     toks >>= 1;
00305     /* check if we have sane number of tokens */
00306     if((toks < 0) || (toks > 0xFFFFFF)){
00307         av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of tokens: %i\n", toks);
00308         tm2_free_codes(&codes);
00309         return -1;
00310     }
00311     ctx->tokens[stream_id] = av_realloc(ctx->tokens[stream_id], toks * sizeof(int));
00312     ctx->tok_lens[stream_id] = toks;
00313     len = AV_RB32(buf); buf += 4; cur += 4;
00314     if(len > 0) {
00315         init_get_bits(&ctx->gb, buf, (skip - cur) * 8);
00316         for(i = 0; i < toks; i++)
00317             ctx->tokens[stream_id][i] = tm2_get_token(&ctx->gb, &codes);
00318     } else {
00319         for(i = 0; i < toks; i++)
00320             ctx->tokens[stream_id][i] = codes.recode[0];
00321     }
00322     tm2_free_codes(&codes);
00323 
00324     return skip;
00325 }
00326 
00327 static inline int GET_TOK(TM2Context *ctx,int type) {
00328     if(ctx->tok_ptrs[type] >= ctx->tok_lens[type]) {
00329         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]);
00330         return 0;
00331     }
00332     if(type <= TM2_MOT)
00333         return ctx->deltas[type][ctx->tokens[type][ctx->tok_ptrs[type]++]];
00334     return ctx->tokens[type][ctx->tok_ptrs[type]++];
00335 }
00336 
00337 /* blocks decoding routines */
00338 
00339 /* common Y, U, V pointers initialisation */
00340 #define TM2_INIT_POINTERS() \
00341     int *last, *clast; \
00342     int *Y, *U, *V;\
00343     int Ystride, Ustride, Vstride;\
00344 \
00345     Ystride = ctx->avctx->width;\
00346     Vstride = (ctx->avctx->width + 1) >> 1;\
00347     Ustride = (ctx->avctx->width + 1) >> 1;\
00348     Y = (ctx->cur?ctx->Y2:ctx->Y1) + by * 4 * Ystride + bx * 4;\
00349     V = (ctx->cur?ctx->V2:ctx->V1) + by * 2 * Vstride + bx * 2;\
00350     U = (ctx->cur?ctx->U2:ctx->U1) + by * 2 * Ustride + bx * 2;\
00351     last = ctx->last + bx * 4;\
00352     clast = ctx->clast + bx * 4;
00353 
00354 #define TM2_INIT_POINTERS_2() \
00355     int *Yo, *Uo, *Vo;\
00356     int oYstride, oUstride, oVstride;\
00357 \
00358     TM2_INIT_POINTERS();\
00359     oYstride = Ystride;\
00360     oVstride = Vstride;\
00361     oUstride = Ustride;\
00362     Yo = (ctx->cur?ctx->Y1:ctx->Y2) + by * 4 * oYstride + bx * 4;\
00363     Vo = (ctx->cur?ctx->V1:ctx->V2) + by * 2 * oVstride + bx * 2;\
00364     Uo = (ctx->cur?ctx->U1:ctx->U2) + by * 2 * oUstride + bx * 2;
00365 
00366 /* recalculate last and delta values for next blocks */
00367 #define TM2_RECALC_BLOCK(CHR, stride, last, CD) {\
00368     CD[0] = CHR[1] - last[1];\
00369     CD[1] = (int)CHR[stride + 1] - (int)CHR[1];\
00370     last[0] = (int)CHR[stride + 0];\
00371     last[1] = (int)CHR[stride + 1];}
00372 
00373 /* common operations - add deltas to 4x4 block of luma or 2x2 blocks of chroma */
00374 static inline void tm2_apply_deltas(TM2Context *ctx, int* Y, int stride, int *deltas, int *last)
00375 {
00376     int ct, d;
00377     int i, j;
00378 
00379     for(j = 0; j < 4; j++){
00380         ct = ctx->D[j];
00381         for(i = 0; i < 4; i++){
00382             d = deltas[i + j * 4];
00383             ct += d;
00384             last[i] += ct;
00385             Y[i] = av_clip_uint8(last[i]);
00386         }
00387         Y += stride;
00388         ctx->D[j] = ct;
00389     }
00390 }
00391 
00392 static inline void tm2_high_chroma(int *data, int stride, int *last, int *CD, int *deltas)
00393 {
00394     int i, j;
00395     for(j = 0; j < 2; j++){
00396         for(i = 0; i < 2; i++){
00397             CD[j] += deltas[i + j * 2];
00398             last[i] += CD[j];
00399             data[i] = last[i];
00400         }
00401         data += stride;
00402     }
00403 }
00404 
00405 static inline void tm2_low_chroma(int *data, int stride, int *clast, int *CD, int *deltas, int bx)
00406 {
00407     int t;
00408     int l;
00409     int prev;
00410 
00411     if(bx > 0)
00412         prev = clast[-3];
00413     else
00414         prev = 0;
00415     t = (CD[0] + CD[1]) >> 1;
00416     l = (prev - CD[0] - CD[1] + clast[1]) >> 1;
00417     CD[1] = CD[0] + CD[1] - t;
00418     CD[0] = t;
00419     clast[0] = l;
00420 
00421     tm2_high_chroma(data, stride, clast, CD, deltas);
00422 }
00423 
00424 static inline void tm2_hi_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
00425 {
00426     int i;
00427     int deltas[16];
00428     TM2_INIT_POINTERS();
00429 
00430     /* hi-res chroma */
00431     for(i = 0; i < 4; i++) {
00432         deltas[i] = GET_TOK(ctx, TM2_C_HI);
00433         deltas[i + 4] = GET_TOK(ctx, TM2_C_HI);
00434     }
00435     tm2_high_chroma(U, Ustride, clast, ctx->CD, deltas);
00436     tm2_high_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas + 4);
00437 
00438     /* hi-res luma */
00439     for(i = 0; i < 16; i++)
00440         deltas[i] = GET_TOK(ctx, TM2_L_HI);
00441 
00442     tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
00443 }
00444 
00445 static inline void tm2_med_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
00446 {
00447     int i;
00448     int deltas[16];
00449     TM2_INIT_POINTERS();
00450 
00451     /* low-res chroma */
00452     deltas[0] = GET_TOK(ctx, TM2_C_LO);
00453     deltas[1] = deltas[2] = deltas[3] = 0;
00454     tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
00455 
00456     deltas[0] = GET_TOK(ctx, TM2_C_LO);
00457     deltas[1] = deltas[2] = deltas[3] = 0;
00458     tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
00459 
00460     /* hi-res luma */
00461     for(i = 0; i < 16; i++)
00462         deltas[i] = GET_TOK(ctx, TM2_L_HI);
00463 
00464     tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
00465 }
00466 
00467 static inline void tm2_low_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
00468 {
00469     int i;
00470     int t1, t2;
00471     int deltas[16];
00472     TM2_INIT_POINTERS();
00473 
00474     /* low-res chroma */
00475     deltas[0] = GET_TOK(ctx, TM2_C_LO);
00476     deltas[1] = deltas[2] = deltas[3] = 0;
00477     tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
00478 
00479     deltas[0] = GET_TOK(ctx, TM2_C_LO);
00480     deltas[1] = deltas[2] = deltas[3] = 0;
00481     tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
00482 
00483     /* low-res luma */
00484     for(i = 0; i < 16; i++)
00485         deltas[i] = 0;
00486 
00487     deltas[ 0] = GET_TOK(ctx, TM2_L_LO);
00488     deltas[ 2] = GET_TOK(ctx, TM2_L_LO);
00489     deltas[ 8] = GET_TOK(ctx, TM2_L_LO);
00490     deltas[10] = GET_TOK(ctx, TM2_L_LO);
00491 
00492     if(bx > 0)
00493         last[0] = (last[-1] - ctx->D[0] - ctx->D[1] - ctx->D[2] - ctx->D[3] + last[1]) >> 1;
00494     else
00495         last[0] = (last[1]  - ctx->D[0] - ctx->D[1] - ctx->D[2] - ctx->D[3])>> 1;
00496     last[2] = (last[1] + last[3]) >> 1;
00497 
00498     t1 = ctx->D[0] + ctx->D[1];
00499     ctx->D[0] = t1 >> 1;
00500     ctx->D[1] = t1 - (t1 >> 1);
00501     t2 = ctx->D[2] + ctx->D[3];
00502     ctx->D[2] = t2 >> 1;
00503     ctx->D[3] = t2 - (t2 >> 1);
00504 
00505     tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
00506 }
00507 
00508 static inline void tm2_null_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
00509 {
00510     int i;
00511     int ct;
00512     int left, right, diff;
00513     int deltas[16];
00514     TM2_INIT_POINTERS();
00515 
00516     /* null chroma */
00517     deltas[0] = deltas[1] = deltas[2] = deltas[3] = 0;
00518     tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
00519 
00520     deltas[0] = deltas[1] = deltas[2] = deltas[3] = 0;
00521     tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
00522 
00523     /* null luma */
00524     for(i = 0; i < 16; i++)
00525         deltas[i] = 0;
00526 
00527     ct = ctx->D[0] + ctx->D[1] + ctx->D[2] + ctx->D[3];
00528 
00529     if(bx > 0)
00530         left = last[-1] - ct;
00531     else
00532         left = 0;
00533 
00534     right = last[3];
00535     diff = right - left;
00536     last[0] = left + (diff >> 2);
00537     last[1] = left + (diff >> 1);
00538     last[2] = right - (diff >> 2);
00539     last[3] = right;
00540     {
00541         int tp = left;
00542 
00543         ctx->D[0] = (tp + (ct >> 2)) - left;
00544         left += ctx->D[0];
00545         ctx->D[1] = (tp + (ct >> 1)) - left;
00546         left += ctx->D[1];
00547         ctx->D[2] = ((tp + ct) - (ct >> 2)) - left;
00548         left += ctx->D[2];
00549         ctx->D[3] = (tp + ct) - left;
00550     }
00551     tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
00552 }
00553 
00554 static inline void tm2_still_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
00555 {
00556     int i, j;
00557     TM2_INIT_POINTERS_2();
00558 
00559     /* update chroma */
00560     for(j = 0; j < 2; j++){
00561         for(i = 0; i < 2; i++){
00562             U[i] = Uo[i];
00563             V[i] = Vo[i];
00564         }
00565         U += Ustride; V += Vstride;
00566         Uo += oUstride; Vo += oVstride;
00567     }
00568     U -= Ustride * 2;
00569     V -= Vstride * 2;
00570     TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
00571     TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
00572 
00573     /* update deltas */
00574     ctx->D[0] = Yo[3] - last[3];
00575     ctx->D[1] = Yo[3 + oYstride] - Yo[3];
00576     ctx->D[2] = Yo[3 + oYstride * 2] - Yo[3 + oYstride];
00577     ctx->D[3] = Yo[3 + oYstride * 3] - Yo[3 + oYstride * 2];
00578 
00579     for(j = 0; j < 4; j++){
00580         for(i = 0; i < 4; i++){
00581             Y[i] = Yo[i];
00582             last[i] = Yo[i];
00583         }
00584         Y += Ystride;
00585         Yo += oYstride;
00586     }
00587 }
00588 
00589 static inline void tm2_update_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
00590 {
00591     int i, j;
00592     int d;
00593     TM2_INIT_POINTERS_2();
00594 
00595     /* update chroma */
00596     for(j = 0; j < 2; j++){
00597         for(i = 0; i < 2; i++){
00598             U[i] = Uo[i] + GET_TOK(ctx, TM2_UPD);
00599             V[i] = Vo[i] + GET_TOK(ctx, TM2_UPD);
00600         }
00601         U += Ustride; V += Vstride;
00602         Uo += oUstride; Vo += oVstride;
00603     }
00604     U -= Ustride * 2;
00605     V -= Vstride * 2;
00606     TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
00607     TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
00608 
00609     /* update deltas */
00610     ctx->D[0] = Yo[3] - last[3];
00611     ctx->D[1] = Yo[3 + oYstride] - Yo[3];
00612     ctx->D[2] = Yo[3 + oYstride * 2] - Yo[3 + oYstride];
00613     ctx->D[3] = Yo[3 + oYstride * 3] - Yo[3 + oYstride * 2];
00614 
00615     for(j = 0; j < 4; j++){
00616         d = last[3];
00617         for(i = 0; i < 4; i++){
00618             Y[i] = Yo[i] + GET_TOK(ctx, TM2_UPD);
00619             last[i] = Y[i];
00620         }
00621         ctx->D[j] = last[3] - d;
00622         Y += Ystride;
00623         Yo += oYstride;
00624     }
00625 }
00626 
00627 static inline void tm2_motion_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
00628 {
00629     int i, j;
00630     int mx, my;
00631     TM2_INIT_POINTERS_2();
00632 
00633     mx = GET_TOK(ctx, TM2_MOT);
00634     my = GET_TOK(ctx, TM2_MOT);
00635 
00636     Yo += my * oYstride + mx;
00637     Uo += (my >> 1) * oUstride + (mx >> 1);
00638     Vo += (my >> 1) * oVstride + (mx >> 1);
00639 
00640     /* copy chroma */
00641     for(j = 0; j < 2; j++){
00642         for(i = 0; i < 2; i++){
00643             U[i] = Uo[i];
00644             V[i] = Vo[i];
00645         }
00646         U += Ustride; V += Vstride;
00647         Uo += oUstride; Vo += oVstride;
00648     }
00649     U -= Ustride * 2;
00650     V -= Vstride * 2;
00651     TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
00652     TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
00653 
00654     /* copy luma */
00655     for(j = 0; j < 4; j++){
00656         for(i = 0; i < 4; i++){
00657             Y[i] = Yo[i];
00658         }
00659         Y += Ystride;
00660         Yo += oYstride;
00661     }
00662     /* calculate deltas */
00663     Y -= Ystride * 4;
00664     ctx->D[0] = Y[3] - last[3];
00665     ctx->D[1] = Y[3 + Ystride] - Y[3];
00666     ctx->D[2] = Y[3 + Ystride * 2] - Y[3 + Ystride];
00667     ctx->D[3] = Y[3 + Ystride * 3] - Y[3 + Ystride * 2];
00668     for(i = 0; i < 4; i++)
00669         last[i] = Y[i + Ystride * 3];
00670 }
00671 
00672 static int tm2_decode_blocks(TM2Context *ctx, AVFrame *p)
00673 {
00674     int i, j;
00675     int bw, bh;
00676     int type;
00677     int keyframe = 1;
00678     int *Y, *U, *V;
00679     uint8_t *dst;
00680 
00681     bw = ctx->avctx->width >> 2;
00682     bh = ctx->avctx->height >> 2;
00683 
00684     for(i = 0; i < TM2_NUM_STREAMS; i++)
00685         ctx->tok_ptrs[i] = 0;
00686 
00687     if (ctx->tok_lens[TM2_TYPE]<bw*bh){
00688         av_log(ctx->avctx,AV_LOG_ERROR,"Got %i tokens for %i blocks\n",ctx->tok_lens[TM2_TYPE],bw*bh);
00689         return -1;
00690     }
00691 
00692     memset(ctx->last, 0, 4 * bw * sizeof(int));
00693     memset(ctx->clast, 0, 4 * bw * sizeof(int));
00694 
00695     for(j = 0; j < bh; j++) {
00696         memset(ctx->D, 0, 4 * sizeof(int));
00697         memset(ctx->CD, 0, 4 * sizeof(int));
00698         for(i = 0; i < bw; i++) {
00699             type = GET_TOK(ctx, TM2_TYPE);
00700             switch(type) {
00701             case TM2_HI_RES:
00702                 tm2_hi_res_block(ctx, p, i, j);
00703                 break;
00704             case TM2_MED_RES:
00705                 tm2_med_res_block(ctx, p, i, j);
00706                 break;
00707             case TM2_LOW_RES:
00708                 tm2_low_res_block(ctx, p, i, j);
00709                 break;
00710             case TM2_NULL_RES:
00711                 tm2_null_res_block(ctx, p, i, j);
00712                 break;
00713             case TM2_UPDATE:
00714                 tm2_update_block(ctx, p, i, j);
00715                 keyframe = 0;
00716                 break;
00717             case TM2_STILL:
00718                 tm2_still_block(ctx, p, i, j);
00719                 keyframe = 0;
00720                 break;
00721             case TM2_MOTION:
00722                 tm2_motion_block(ctx, p, i, j);
00723                 keyframe = 0;
00724                 break;
00725             default:
00726                 av_log(ctx->avctx, AV_LOG_ERROR, "Skipping unknown block type %i\n", type);
00727             }
00728         }
00729     }
00730 
00731     /* copy data from our buffer to AVFrame */
00732     Y = (ctx->cur?ctx->Y2:ctx->Y1);
00733     U = (ctx->cur?ctx->U2:ctx->U1);
00734     V = (ctx->cur?ctx->V2:ctx->V1);
00735     dst = p->data[0];
00736     for(j = 0; j < ctx->avctx->height; j++){
00737         for(i = 0; i < ctx->avctx->width; i++){
00738             int y = Y[i], u = U[i >> 1], v = V[i >> 1];
00739             dst[3*i+0] = av_clip_uint8(y + v);
00740             dst[3*i+1] = av_clip_uint8(y);
00741             dst[3*i+2] = av_clip_uint8(y + u);
00742         }
00743         Y += ctx->avctx->width;
00744         if (j & 1) {
00745             U += ctx->avctx->width >> 1;
00746             V += ctx->avctx->width >> 1;
00747         }
00748         dst += p->linesize[0];
00749     }
00750 
00751     return keyframe;
00752 }
00753 
00754 static const int tm2_stream_order[TM2_NUM_STREAMS] = {
00755     TM2_C_HI, TM2_C_LO, TM2_L_HI, TM2_L_LO, TM2_UPD, TM2_MOT, TM2_TYPE
00756 };
00757 
00758 static int decode_frame(AVCodecContext *avctx,
00759                         void *data, int *data_size,
00760                         AVPacket *avpkt)
00761 {
00762     const uint8_t *buf = avpkt->data;
00763     int buf_size = avpkt->size;
00764     TM2Context * const l = avctx->priv_data;
00765     AVFrame * const p= (AVFrame*)&l->pic;
00766     int i, skip, t;
00767     uint8_t *swbuf;
00768 
00769     swbuf = av_malloc(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
00770     if(!swbuf){
00771         av_log(avctx, AV_LOG_ERROR, "Cannot allocate temporary buffer\n");
00772         return -1;
00773     }
00774     p->reference = 1;
00775     p->buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
00776     if(avctx->reget_buffer(avctx, p) < 0){
00777         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00778         av_free(swbuf);
00779         return -1;
00780     }
00781 
00782     l->dsp.bswap_buf((uint32_t*)swbuf, (const uint32_t*)buf, buf_size >> 2);
00783     skip = tm2_read_header(l, swbuf);
00784 
00785     if(skip == -1){
00786         av_free(swbuf);
00787         return -1;
00788     }
00789 
00790     for(i = 0; i < TM2_NUM_STREAMS; i++){
00791         t = tm2_read_stream(l, swbuf + skip, tm2_stream_order[i]);
00792         if(t == -1){
00793             av_free(swbuf);
00794             return -1;
00795         }
00796         skip += t;
00797     }
00798     p->key_frame = tm2_decode_blocks(l, p);
00799     if(p->key_frame)
00800         p->pict_type = FF_I_TYPE;
00801     else
00802         p->pict_type = FF_P_TYPE;
00803 
00804     l->cur = !l->cur;
00805     *data_size = sizeof(AVFrame);
00806     *(AVFrame*)data = l->pic;
00807     av_free(swbuf);
00808 
00809     return buf_size;
00810 }
00811 
00812 static av_cold int decode_init(AVCodecContext *avctx){
00813     TM2Context * const l = avctx->priv_data;
00814     int i;
00815 
00816     if((avctx->width & 3) || (avctx->height & 3)){
00817         av_log(avctx, AV_LOG_ERROR, "Width and height must be multiple of 4\n");
00818         return -1;
00819     }
00820 
00821     l->avctx = avctx;
00822     l->pic.data[0]=NULL;
00823     avctx->pix_fmt = PIX_FMT_BGR24;
00824 
00825     dsputil_init(&l->dsp, avctx);
00826 
00827     l->last = av_malloc(4 * sizeof(int) * (avctx->width >> 2));
00828     l->clast = av_malloc(4 * sizeof(int) * (avctx->width >> 2));
00829 
00830     for(i = 0; i < TM2_NUM_STREAMS; i++) {
00831         l->tokens[i] = NULL;
00832         l->tok_lens[i] = 0;
00833     }
00834 
00835     l->Y1 = av_malloc(sizeof(int) * avctx->width * avctx->height);
00836     l->U1 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));
00837     l->V1 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));
00838     l->Y2 = av_malloc(sizeof(int) * avctx->width * avctx->height);
00839     l->U2 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));
00840     l->V2 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));
00841     l->cur = 0;
00842 
00843     return 0;
00844 }
00845 
00846 static av_cold int decode_end(AVCodecContext *avctx){
00847     TM2Context * const l = avctx->priv_data;
00848     AVFrame *pic = &l->pic;
00849     int i;
00850 
00851     if(l->last)
00852         av_free(l->last);
00853     if(l->clast)
00854         av_free(l->clast);
00855     for(i = 0; i < TM2_NUM_STREAMS; i++)
00856         if(l->tokens[i])
00857             av_free(l->tokens[i]);
00858     if(l->Y1){
00859         av_free(l->Y1);
00860         av_free(l->U1);
00861         av_free(l->V1);
00862         av_free(l->Y2);
00863         av_free(l->U2);
00864         av_free(l->V2);
00865     }
00866 
00867     if (pic->data[0])
00868         avctx->release_buffer(avctx, pic);
00869 
00870     return 0;
00871 }
00872 
00873 AVCodec truemotion2_decoder = {
00874     "truemotion2",
00875     AVMEDIA_TYPE_VIDEO,
00876     CODEC_ID_TRUEMOTION2,
00877     sizeof(TM2Context),
00878     decode_init,
00879     NULL,
00880     decode_end,
00881     decode_frame,
00882     CODEC_CAP_DR1,
00883     .long_name = NULL_IF_CONFIG_SMALL("Duck TrueMotion 2.0"),
00884 };