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     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             init_get_bits(&ctx->gb, buf, (skip - cur) * 8);
00276             if(tm2_read_deltas(ctx, stream_id) == -1)
00277                 return -1;
00278             buf += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
00279             cur += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
00280         }
00281     }
00282     /* skip unused fields */
00283     if(AV_RB32(buf) == TM2_ESCAPE) {
00284         buf += 4; cur += 4; /* some unknown length - could be escaped too */
00285     }
00286     buf += 4; cur += 4;
00287     buf += 4; cur += 4; /* unused by decoder */
00288 
00289     if(skip < cur)
00290         return -1;
00291     init_get_bits(&ctx->gb, buf, (skip - cur) * 8);
00292     if(tm2_build_huff_table(ctx, &codes) == -1)
00293         return -1;
00294     buf += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
00295     cur += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
00296 
00297     toks >>= 1;
00298     /* check if we have sane number of tokens */
00299     if((toks < 0) || (toks > 0xFFFFFF)){
00300         av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of tokens: %i\n", toks);
00301         tm2_free_codes(&codes);
00302         return -1;
00303     }
00304     ctx->tokens[stream_id] = av_realloc(ctx->tokens[stream_id], toks * sizeof(int));
00305     ctx->tok_lens[stream_id] = toks;
00306     len = AV_RB32(buf); buf += 4; cur += 4;
00307     if(len > 0) {
00308         init_get_bits(&ctx->gb, buf, (skip - cur) * 8);
00309         for(i = 0; i < toks; i++) {
00310             if (get_bits_left(&ctx->gb) <= 0) {
00311                 av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of tokens: %i\n", toks);
00312                 return -1;
00313             }
00314             ctx->tokens[stream_id][i] = tm2_get_token(&ctx->gb, &codes);
00315         }
00316     } else {
00317         for(i = 0; i < toks; i++)
00318             ctx->tokens[stream_id][i] = codes.recode[0];
00319     }
00320     tm2_free_codes(&codes);
00321 
00322     return skip;
00323 }
00324 
00325 static inline int GET_TOK(TM2Context *ctx,int type) {
00326     if(ctx->tok_ptrs[type] >= ctx->tok_lens[type]) {
00327         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]);
00328         return 0;
00329     }
00330     if(type <= TM2_MOT)
00331         return ctx->deltas[type][ctx->tokens[type][ctx->tok_ptrs[type]++]];
00332     return ctx->tokens[type][ctx->tok_ptrs[type]++];
00333 }
00334 
00335 /* blocks decoding routines */
00336 
00337 /* common Y, U, V pointers initialisation */
00338 #define TM2_INIT_POINTERS() \
00339     int *last, *clast; \
00340     int *Y, *U, *V;\
00341     int Ystride, Ustride, Vstride;\
00342 \
00343     Ystride = ctx->avctx->width;\
00344     Vstride = (ctx->avctx->width + 1) >> 1;\
00345     Ustride = (ctx->avctx->width + 1) >> 1;\
00346     Y = (ctx->cur?ctx->Y2:ctx->Y1) + by * 4 * Ystride + bx * 4;\
00347     V = (ctx->cur?ctx->V2:ctx->V1) + by * 2 * Vstride + bx * 2;\
00348     U = (ctx->cur?ctx->U2:ctx->U1) + by * 2 * Ustride + bx * 2;\
00349     last = ctx->last + bx * 4;\
00350     clast = ctx->clast + bx * 4;
00351 
00352 #define TM2_INIT_POINTERS_2() \
00353     int *Yo, *Uo, *Vo;\
00354     int oYstride, oUstride, oVstride;\
00355 \
00356     TM2_INIT_POINTERS();\
00357     oYstride = Ystride;\
00358     oVstride = Vstride;\
00359     oUstride = Ustride;\
00360     Yo = (ctx->cur?ctx->Y1:ctx->Y2) + by * 4 * oYstride + bx * 4;\
00361     Vo = (ctx->cur?ctx->V1:ctx->V2) + by * 2 * oVstride + bx * 2;\
00362     Uo = (ctx->cur?ctx->U1:ctx->U2) + by * 2 * oUstride + bx * 2;
00363 
00364 /* recalculate last and delta values for next blocks */
00365 #define TM2_RECALC_BLOCK(CHR, stride, last, CD) {\
00366     CD[0] = CHR[1] - last[1];\
00367     CD[1] = (int)CHR[stride + 1] - (int)CHR[1];\
00368     last[0] = (int)CHR[stride + 0];\
00369     last[1] = (int)CHR[stride + 1];}
00370 
00371 /* common operations - add deltas to 4x4 block of luma or 2x2 blocks of chroma */
00372 static inline void tm2_apply_deltas(TM2Context *ctx, int* Y, int stride, int *deltas, int *last)
00373 {
00374     int ct, d;
00375     int i, j;
00376 
00377     for(j = 0; j < 4; j++){
00378         ct = ctx->D[j];
00379         for(i = 0; i < 4; i++){
00380             d = deltas[i + j * 4];
00381             ct += d;
00382             last[i] += ct;
00383             Y[i] = av_clip_uint8(last[i]);
00384         }
00385         Y += stride;
00386         ctx->D[j] = ct;
00387     }
00388 }
00389 
00390 static inline void tm2_high_chroma(int *data, int stride, int *last, int *CD, int *deltas)
00391 {
00392     int i, j;
00393     for(j = 0; j < 2; j++){
00394         for(i = 0; i < 2; i++){
00395             CD[j] += deltas[i + j * 2];
00396             last[i] += CD[j];
00397             data[i] = last[i];
00398         }
00399         data += stride;
00400     }
00401 }
00402 
00403 static inline void tm2_low_chroma(int *data, int stride, int *clast, int *CD, int *deltas, int bx)
00404 {
00405     int t;
00406     int l;
00407     int prev;
00408 
00409     if(bx > 0)
00410         prev = clast[-3];
00411     else
00412         prev = 0;
00413     t = (CD[0] + CD[1]) >> 1;
00414     l = (prev - CD[0] - CD[1] + clast[1]) >> 1;
00415     CD[1] = CD[0] + CD[1] - t;
00416     CD[0] = t;
00417     clast[0] = l;
00418 
00419     tm2_high_chroma(data, stride, clast, CD, deltas);
00420 }
00421 
00422 static inline void tm2_hi_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
00423 {
00424     int i;
00425     int deltas[16];
00426     TM2_INIT_POINTERS();
00427 
00428     /* hi-res chroma */
00429     for(i = 0; i < 4; i++) {
00430         deltas[i] = GET_TOK(ctx, TM2_C_HI);
00431         deltas[i + 4] = GET_TOK(ctx, TM2_C_HI);
00432     }
00433     tm2_high_chroma(U, Ustride, clast, ctx->CD, deltas);
00434     tm2_high_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas + 4);
00435 
00436     /* hi-res luma */
00437     for(i = 0; i < 16; i++)
00438         deltas[i] = GET_TOK(ctx, TM2_L_HI);
00439 
00440     tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
00441 }
00442 
00443 static inline void tm2_med_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
00444 {
00445     int i;
00446     int deltas[16];
00447     TM2_INIT_POINTERS();
00448 
00449     /* low-res chroma */
00450     deltas[0] = GET_TOK(ctx, TM2_C_LO);
00451     deltas[1] = deltas[2] = deltas[3] = 0;
00452     tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
00453 
00454     deltas[0] = GET_TOK(ctx, TM2_C_LO);
00455     deltas[1] = deltas[2] = deltas[3] = 0;
00456     tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
00457 
00458     /* hi-res luma */
00459     for(i = 0; i < 16; i++)
00460         deltas[i] = GET_TOK(ctx, TM2_L_HI);
00461 
00462     tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
00463 }
00464 
00465 static inline void tm2_low_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
00466 {
00467     int i;
00468     int t1, t2;
00469     int deltas[16];
00470     TM2_INIT_POINTERS();
00471 
00472     /* low-res chroma */
00473     deltas[0] = GET_TOK(ctx, TM2_C_LO);
00474     deltas[1] = deltas[2] = deltas[3] = 0;
00475     tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
00476 
00477     deltas[0] = GET_TOK(ctx, TM2_C_LO);
00478     deltas[1] = deltas[2] = deltas[3] = 0;
00479     tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
00480 
00481     /* low-res luma */
00482     for(i = 0; i < 16; i++)
00483         deltas[i] = 0;
00484 
00485     deltas[ 0] = GET_TOK(ctx, TM2_L_LO);
00486     deltas[ 2] = GET_TOK(ctx, TM2_L_LO);
00487     deltas[ 8] = GET_TOK(ctx, TM2_L_LO);
00488     deltas[10] = GET_TOK(ctx, TM2_L_LO);
00489 
00490     if(bx > 0)
00491         last[0] = (last[-1] - ctx->D[0] - ctx->D[1] - ctx->D[2] - ctx->D[3] + last[1]) >> 1;
00492     else
00493         last[0] = (last[1]  - ctx->D[0] - ctx->D[1] - ctx->D[2] - ctx->D[3])>> 1;
00494     last[2] = (last[1] + last[3]) >> 1;
00495 
00496     t1 = ctx->D[0] + ctx->D[1];
00497     ctx->D[0] = t1 >> 1;
00498     ctx->D[1] = t1 - (t1 >> 1);
00499     t2 = ctx->D[2] + ctx->D[3];
00500     ctx->D[2] = t2 >> 1;
00501     ctx->D[3] = t2 - (t2 >> 1);
00502 
00503     tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
00504 }
00505 
00506 static inline void tm2_null_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
00507 {
00508     int i;
00509     int ct;
00510     int left, right, diff;
00511     int deltas[16];
00512     TM2_INIT_POINTERS();
00513 
00514     /* null chroma */
00515     deltas[0] = deltas[1] = deltas[2] = deltas[3] = 0;
00516     tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
00517 
00518     deltas[0] = deltas[1] = deltas[2] = deltas[3] = 0;
00519     tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
00520 
00521     /* null luma */
00522     for(i = 0; i < 16; i++)
00523         deltas[i] = 0;
00524 
00525     ct = ctx->D[0] + ctx->D[1] + ctx->D[2] + ctx->D[3];
00526 
00527     if(bx > 0)
00528         left = last[-1] - ct;
00529     else
00530         left = 0;
00531 
00532     right = last[3];
00533     diff = right - left;
00534     last[0] = left + (diff >> 2);
00535     last[1] = left + (diff >> 1);
00536     last[2] = right - (diff >> 2);
00537     last[3] = right;
00538     {
00539         int tp = left;
00540 
00541         ctx->D[0] = (tp + (ct >> 2)) - left;
00542         left += ctx->D[0];
00543         ctx->D[1] = (tp + (ct >> 1)) - left;
00544         left += ctx->D[1];
00545         ctx->D[2] = ((tp + ct) - (ct >> 2)) - left;
00546         left += ctx->D[2];
00547         ctx->D[3] = (tp + ct) - left;
00548     }
00549     tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
00550 }
00551 
00552 static inline void tm2_still_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
00553 {
00554     int i, j;
00555     TM2_INIT_POINTERS_2();
00556 
00557     /* update chroma */
00558     for(j = 0; j < 2; j++){
00559         for(i = 0; i < 2; i++){
00560             U[i] = Uo[i];
00561             V[i] = Vo[i];
00562         }
00563         U += Ustride; V += Vstride;
00564         Uo += oUstride; Vo += oVstride;
00565     }
00566     U -= Ustride * 2;
00567     V -= Vstride * 2;
00568     TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
00569     TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
00570 
00571     /* update deltas */
00572     ctx->D[0] = Yo[3] - last[3];
00573     ctx->D[1] = Yo[3 + oYstride] - Yo[3];
00574     ctx->D[2] = Yo[3 + oYstride * 2] - Yo[3 + oYstride];
00575     ctx->D[3] = Yo[3 + oYstride * 3] - Yo[3 + oYstride * 2];
00576 
00577     for(j = 0; j < 4; j++){
00578         for(i = 0; i < 4; i++){
00579             Y[i] = Yo[i];
00580             last[i] = Yo[i];
00581         }
00582         Y += Ystride;
00583         Yo += oYstride;
00584     }
00585 }
00586 
00587 static inline void tm2_update_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
00588 {
00589     int i, j;
00590     int d;
00591     TM2_INIT_POINTERS_2();
00592 
00593     /* update chroma */
00594     for(j = 0; j < 2; j++){
00595         for(i = 0; i < 2; i++){
00596             U[i] = Uo[i] + GET_TOK(ctx, TM2_UPD);
00597             V[i] = Vo[i] + GET_TOK(ctx, TM2_UPD);
00598         }
00599         U += Ustride; V += Vstride;
00600         Uo += oUstride; Vo += oVstride;
00601     }
00602     U -= Ustride * 2;
00603     V -= Vstride * 2;
00604     TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
00605     TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
00606 
00607     /* update deltas */
00608     ctx->D[0] = Yo[3] - last[3];
00609     ctx->D[1] = Yo[3 + oYstride] - Yo[3];
00610     ctx->D[2] = Yo[3 + oYstride * 2] - Yo[3 + oYstride];
00611     ctx->D[3] = Yo[3 + oYstride * 3] - Yo[3 + oYstride * 2];
00612 
00613     for(j = 0; j < 4; j++){
00614         d = last[3];
00615         for(i = 0; i < 4; i++){
00616             Y[i] = Yo[i] + GET_TOK(ctx, TM2_UPD);
00617             last[i] = Y[i];
00618         }
00619         ctx->D[j] = last[3] - d;
00620         Y += Ystride;
00621         Yo += oYstride;
00622     }
00623 }
00624 
00625 static inline void tm2_motion_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
00626 {
00627     int i, j;
00628     int mx, my;
00629     TM2_INIT_POINTERS_2();
00630 
00631     mx = GET_TOK(ctx, TM2_MOT);
00632     my = GET_TOK(ctx, TM2_MOT);
00633 
00634     Yo += my * oYstride + mx;
00635     Uo += (my >> 1) * oUstride + (mx >> 1);
00636     Vo += (my >> 1) * oVstride + (mx >> 1);
00637 
00638     /* copy chroma */
00639     for(j = 0; j < 2; j++){
00640         for(i = 0; i < 2; i++){
00641             U[i] = Uo[i];
00642             V[i] = Vo[i];
00643         }
00644         U += Ustride; V += Vstride;
00645         Uo += oUstride; Vo += oVstride;
00646     }
00647     U -= Ustride * 2;
00648     V -= Vstride * 2;
00649     TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
00650     TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
00651 
00652     /* copy luma */
00653     for(j = 0; j < 4; j++){
00654         for(i = 0; i < 4; i++){
00655             Y[i] = Yo[i];
00656         }
00657         Y += Ystride;
00658         Yo += oYstride;
00659     }
00660     /* calculate deltas */
00661     Y -= Ystride * 4;
00662     ctx->D[0] = Y[3] - last[3];
00663     ctx->D[1] = Y[3 + Ystride] - Y[3];
00664     ctx->D[2] = Y[3 + Ystride * 2] - Y[3 + Ystride];
00665     ctx->D[3] = Y[3 + Ystride * 3] - Y[3 + Ystride * 2];
00666     for(i = 0; i < 4; i++)
00667         last[i] = Y[i + Ystride * 3];
00668 }
00669 
00670 static int tm2_decode_blocks(TM2Context *ctx, AVFrame *p)
00671 {
00672     int i, j;
00673     int bw, bh;
00674     int type;
00675     int keyframe = 1;
00676     int *Y, *U, *V;
00677     uint8_t *dst;
00678 
00679     bw = ctx->avctx->width >> 2;
00680     bh = ctx->avctx->height >> 2;
00681 
00682     for(i = 0; i < TM2_NUM_STREAMS; i++)
00683         ctx->tok_ptrs[i] = 0;
00684 
00685     if (ctx->tok_lens[TM2_TYPE]<bw*bh){
00686         av_log(ctx->avctx,AV_LOG_ERROR,"Got %i tokens for %i blocks\n",ctx->tok_lens[TM2_TYPE],bw*bh);
00687         return -1;
00688     }
00689 
00690     memset(ctx->last, 0, 4 * bw * sizeof(int));
00691     memset(ctx->clast, 0, 4 * bw * sizeof(int));
00692 
00693     for(j = 0; j < bh; j++) {
00694         memset(ctx->D, 0, 4 * sizeof(int));
00695         memset(ctx->CD, 0, 4 * sizeof(int));
00696         for(i = 0; i < bw; i++) {
00697             type = GET_TOK(ctx, TM2_TYPE);
00698             switch(type) {
00699             case TM2_HI_RES:
00700                 tm2_hi_res_block(ctx, p, i, j);
00701                 break;
00702             case TM2_MED_RES:
00703                 tm2_med_res_block(ctx, p, i, j);
00704                 break;
00705             case TM2_LOW_RES:
00706                 tm2_low_res_block(ctx, p, i, j);
00707                 break;
00708             case TM2_NULL_RES:
00709                 tm2_null_res_block(ctx, p, i, j);
00710                 break;
00711             case TM2_UPDATE:
00712                 tm2_update_block(ctx, p, i, j);
00713                 keyframe = 0;
00714                 break;
00715             case TM2_STILL:
00716                 tm2_still_block(ctx, p, i, j);
00717                 keyframe = 0;
00718                 break;
00719             case TM2_MOTION:
00720                 tm2_motion_block(ctx, p, i, j);
00721                 keyframe = 0;
00722                 break;
00723             default:
00724                 av_log(ctx->avctx, AV_LOG_ERROR, "Skipping unknown block type %i\n", type);
00725             }
00726         }
00727     }
00728 
00729     /* copy data from our buffer to AVFrame */
00730     Y = (ctx->cur?ctx->Y2:ctx->Y1);
00731     U = (ctx->cur?ctx->U2:ctx->U1);
00732     V = (ctx->cur?ctx->V2:ctx->V1);
00733     dst = p->data[0];
00734     for(j = 0; j < ctx->avctx->height; j++){
00735         for(i = 0; i < ctx->avctx->width; i++){
00736             int y = Y[i], u = U[i >> 1], v = V[i >> 1];
00737             dst[3*i+0] = av_clip_uint8(y + v);
00738             dst[3*i+1] = av_clip_uint8(y);
00739             dst[3*i+2] = av_clip_uint8(y + u);
00740         }
00741         Y += ctx->avctx->width;
00742         if (j & 1) {
00743             U += ctx->avctx->width >> 1;
00744             V += ctx->avctx->width >> 1;
00745         }
00746         dst += p->linesize[0];
00747     }
00748 
00749     return keyframe;
00750 }
00751 
00752 static const int tm2_stream_order[TM2_NUM_STREAMS] = {
00753     TM2_C_HI, TM2_C_LO, TM2_L_HI, TM2_L_LO, TM2_UPD, TM2_MOT, TM2_TYPE
00754 };
00755 
00756 static int decode_frame(AVCodecContext *avctx,
00757                         void *data, int *data_size,
00758                         AVPacket *avpkt)
00759 {
00760     const uint8_t *buf = avpkt->data;
00761     int buf_size = avpkt->size;
00762     TM2Context * const l = avctx->priv_data;
00763     AVFrame * const p= (AVFrame*)&l->pic;
00764     int i, skip, t;
00765     uint8_t *swbuf;
00766 
00767     swbuf = av_malloc(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
00768     if(!swbuf){
00769         av_log(avctx, AV_LOG_ERROR, "Cannot allocate temporary buffer\n");
00770         return -1;
00771     }
00772     p->reference = 3;
00773     p->buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
00774     if(avctx->reget_buffer(avctx, p) < 0){
00775         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00776         av_free(swbuf);
00777         return -1;
00778     }
00779 
00780     l->dsp.bswap_buf((uint32_t*)swbuf, (const uint32_t*)buf, buf_size >> 2);
00781     skip = tm2_read_header(l, swbuf);
00782 
00783     if(skip == -1){
00784         av_free(swbuf);
00785         return -1;
00786     }
00787 
00788     for(i = 0; i < TM2_NUM_STREAMS; i++){
00789         t = tm2_read_stream(l, swbuf + skip, tm2_stream_order[i], buf_size);
00790         if(t == -1){
00791             av_free(swbuf);
00792             return -1;
00793         }
00794         skip += t;
00795     }
00796     p->key_frame = tm2_decode_blocks(l, p);
00797     if(p->key_frame)
00798         p->pict_type = AV_PICTURE_TYPE_I;
00799     else
00800         p->pict_type = AV_PICTURE_TYPE_P;
00801 
00802     l->cur = !l->cur;
00803     *data_size = sizeof(AVFrame);
00804     *(AVFrame*)data = l->pic;
00805     av_free(swbuf);
00806 
00807     return buf_size;
00808 }
00809 
00810 static av_cold int decode_init(AVCodecContext *avctx){
00811     TM2Context * const l = avctx->priv_data;
00812     int i;
00813 
00814     if((avctx->width & 3) || (avctx->height & 3)){
00815         av_log(avctx, AV_LOG_ERROR, "Width and height must be multiple of 4\n");
00816         return -1;
00817     }
00818 
00819     l->avctx = avctx;
00820     l->pic.data[0]=NULL;
00821     avctx->pix_fmt = PIX_FMT_BGR24;
00822     avcodec_get_frame_defaults(&l->pic);
00823 
00824     dsputil_init(&l->dsp, avctx);
00825 
00826     l->last = av_malloc(4 * sizeof(int) * (avctx->width >> 2));
00827     l->clast = av_malloc(4 * sizeof(int) * (avctx->width >> 2));
00828 
00829     for(i = 0; i < TM2_NUM_STREAMS; i++) {
00830         l->tokens[i] = NULL;
00831         l->tok_lens[i] = 0;
00832     }
00833 
00834     l->Y1 = av_malloc(sizeof(int) * avctx->width * avctx->height);
00835     l->U1 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));
00836     l->V1 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));
00837     l->Y2 = av_malloc(sizeof(int) * avctx->width * avctx->height);
00838     l->U2 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));
00839     l->V2 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));
00840     l->cur = 0;
00841 
00842     return 0;
00843 }
00844 
00845 static av_cold int decode_end(AVCodecContext *avctx){
00846     TM2Context * const l = avctx->priv_data;
00847     AVFrame *pic = &l->pic;
00848     int i;
00849 
00850     av_free(l->last);
00851     av_free(l->clast);
00852     for(i = 0; i < TM2_NUM_STREAMS; i++)
00853         av_free(l->tokens[i]);
00854     if(l->Y1){
00855         av_free(l->Y1);
00856         av_free(l->U1);
00857         av_free(l->V1);
00858         av_free(l->Y2);
00859         av_free(l->U2);
00860         av_free(l->V2);
00861     }
00862 
00863     if (pic->data[0])
00864         avctx->release_buffer(avctx, pic);
00865 
00866     return 0;
00867 }
00868 
00869 AVCodec ff_truemotion2_decoder = {
00870     .name           = "truemotion2",
00871     .type           = AVMEDIA_TYPE_VIDEO,
00872     .id             = CODEC_ID_TRUEMOTION2,
00873     .priv_data_size = sizeof(TM2Context),
00874     .init           = decode_init,
00875     .close          = decode_end,
00876     .decode         = decode_frame,
00877     .capabilities   = CODEC_CAP_DR1,
00878     .long_name = NULL_IF_CONFIG_SMALL("Duck TrueMotion 2.0"),
00879 };