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, int buf_size)
00264 {
00265     int i;
00266     int cur = 0;
00267     int skip = 0;
00268     int len, toks;
00269     TM2Codes codes;
00270 
00271     /* get stream length in dwords */
00272     len = AV_RB32(buf); buf += 4; cur += 4;
00273     skip = len * 4 + 4;
00274 
00275     if(len == 0)
00276         return 4;
00277 
00278     if (len >= INT_MAX/4-1 || len < 0 || len > buf_size) {
00279         av_log(ctx->avctx, AV_LOG_ERROR, "Error, invalid stream size.\n");
00280         return -1;
00281     }
00282 
00283     toks = AV_RB32(buf); buf += 4; cur += 4;
00284     if(toks & 1) {
00285         len = AV_RB32(buf); buf += 4; cur += 4;
00286         if(len == TM2_ESCAPE) {
00287             len = AV_RB32(buf); buf += 4; cur += 4;
00288         }
00289         if(len > 0) {
00290             init_get_bits(&ctx->gb, buf, (skip - cur) * 8);
00291             if(tm2_read_deltas(ctx, stream_id) == -1)
00292                 return -1;
00293             buf += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
00294             cur += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
00295         }
00296     }
00297     /* skip unused fields */
00298     if(AV_RB32(buf) == TM2_ESCAPE) {
00299         buf += 4; cur += 4; /* some unknown length - could be escaped too */
00300     }
00301     buf += 4; cur += 4;
00302     buf += 4; cur += 4; /* unused by decoder */
00303 
00304     init_get_bits(&ctx->gb, buf, (skip - cur) * 8);
00305     if(tm2_build_huff_table(ctx, &codes) == -1)
00306         return -1;
00307     buf += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
00308     cur += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
00309 
00310     toks >>= 1;
00311     /* check if we have sane number of tokens */
00312     if((toks < 0) || (toks > 0xFFFFFF)){
00313         av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of tokens: %i\n", toks);
00314         tm2_free_codes(&codes);
00315         return -1;
00316     }
00317     ctx->tokens[stream_id] = av_realloc(ctx->tokens[stream_id], toks * sizeof(int));
00318     ctx->tok_lens[stream_id] = toks;
00319     len = AV_RB32(buf); buf += 4; cur += 4;
00320     if(len > 0) {
00321         init_get_bits(&ctx->gb, buf, (skip - cur) * 8);
00322         for(i = 0; i < toks; i++) {
00323             if (get_bits_left(&ctx->gb) <= 0) {
00324                 av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of tokens: %i\n", toks);
00325                 return -1;
00326             }
00327             ctx->tokens[stream_id][i] = tm2_get_token(&ctx->gb, &codes);
00328         }
00329     } else {
00330         for(i = 0; i < toks; i++)
00331             ctx->tokens[stream_id][i] = codes.recode[0];
00332     }
00333     tm2_free_codes(&codes);
00334 
00335     return skip;
00336 }
00337 
00338 static inline int GET_TOK(TM2Context *ctx,int type) {
00339     if(ctx->tok_ptrs[type] >= ctx->tok_lens[type]) {
00340         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]);
00341         return 0;
00342     }
00343     if(type <= TM2_MOT)
00344         return ctx->deltas[type][ctx->tokens[type][ctx->tok_ptrs[type]++]];
00345     return ctx->tokens[type][ctx->tok_ptrs[type]++];
00346 }
00347 
00348 /* blocks decoding routines */
00349 
00350 /* common Y, U, V pointers initialisation */
00351 #define TM2_INIT_POINTERS() \
00352     int *last, *clast; \
00353     int *Y, *U, *V;\
00354     int Ystride, Ustride, Vstride;\
00355 \
00356     Ystride = ctx->avctx->width;\
00357     Vstride = (ctx->avctx->width + 1) >> 1;\
00358     Ustride = (ctx->avctx->width + 1) >> 1;\
00359     Y = (ctx->cur?ctx->Y2:ctx->Y1) + by * 4 * Ystride + bx * 4;\
00360     V = (ctx->cur?ctx->V2:ctx->V1) + by * 2 * Vstride + bx * 2;\
00361     U = (ctx->cur?ctx->U2:ctx->U1) + by * 2 * Ustride + bx * 2;\
00362     last = ctx->last + bx * 4;\
00363     clast = ctx->clast + bx * 4;
00364 
00365 #define TM2_INIT_POINTERS_2() \
00366     int *Yo, *Uo, *Vo;\
00367     int oYstride, oUstride, oVstride;\
00368 \
00369     TM2_INIT_POINTERS();\
00370     oYstride = Ystride;\
00371     oVstride = Vstride;\
00372     oUstride = Ustride;\
00373     Yo = (ctx->cur?ctx->Y1:ctx->Y2) + by * 4 * oYstride + bx * 4;\
00374     Vo = (ctx->cur?ctx->V1:ctx->V2) + by * 2 * oVstride + bx * 2;\
00375     Uo = (ctx->cur?ctx->U1:ctx->U2) + by * 2 * oUstride + bx * 2;
00376 
00377 /* recalculate last and delta values for next blocks */
00378 #define TM2_RECALC_BLOCK(CHR, stride, last, CD) {\
00379     CD[0] = CHR[1] - last[1];\
00380     CD[1] = (int)CHR[stride + 1] - (int)CHR[1];\
00381     last[0] = (int)CHR[stride + 0];\
00382     last[1] = (int)CHR[stride + 1];}
00383 
00384 /* common operations - add deltas to 4x4 block of luma or 2x2 blocks of chroma */
00385 static inline void tm2_apply_deltas(TM2Context *ctx, int* Y, int stride, int *deltas, int *last)
00386 {
00387     int ct, d;
00388     int i, j;
00389 
00390     for(j = 0; j < 4; j++){
00391         ct = ctx->D[j];
00392         for(i = 0; i < 4; i++){
00393             d = deltas[i + j * 4];
00394             ct += d;
00395             last[i] += ct;
00396             Y[i] = av_clip_uint8(last[i]);
00397         }
00398         Y += stride;
00399         ctx->D[j] = ct;
00400     }
00401 }
00402 
00403 static inline void tm2_high_chroma(int *data, int stride, int *last, int *CD, int *deltas)
00404 {
00405     int i, j;
00406     for(j = 0; j < 2; j++){
00407         for(i = 0; i < 2; i++){
00408             CD[j] += deltas[i + j * 2];
00409             last[i] += CD[j];
00410             data[i] = last[i];
00411         }
00412         data += stride;
00413     }
00414 }
00415 
00416 static inline void tm2_low_chroma(int *data, int stride, int *clast, int *CD, int *deltas, int bx)
00417 {
00418     int t;
00419     int l;
00420     int prev;
00421 
00422     if(bx > 0)
00423         prev = clast[-3];
00424     else
00425         prev = 0;
00426     t = (CD[0] + CD[1]) >> 1;
00427     l = (prev - CD[0] - CD[1] + clast[1]) >> 1;
00428     CD[1] = CD[0] + CD[1] - t;
00429     CD[0] = t;
00430     clast[0] = l;
00431 
00432     tm2_high_chroma(data, stride, clast, CD, deltas);
00433 }
00434 
00435 static inline void tm2_hi_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
00436 {
00437     int i;
00438     int deltas[16];
00439     TM2_INIT_POINTERS();
00440 
00441     /* hi-res chroma */
00442     for(i = 0; i < 4; i++) {
00443         deltas[i] = GET_TOK(ctx, TM2_C_HI);
00444         deltas[i + 4] = GET_TOK(ctx, TM2_C_HI);
00445     }
00446     tm2_high_chroma(U, Ustride, clast, ctx->CD, deltas);
00447     tm2_high_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas + 4);
00448 
00449     /* hi-res luma */
00450     for(i = 0; i < 16; i++)
00451         deltas[i] = GET_TOK(ctx, TM2_L_HI);
00452 
00453     tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
00454 }
00455 
00456 static inline void tm2_med_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
00457 {
00458     int i;
00459     int deltas[16];
00460     TM2_INIT_POINTERS();
00461 
00462     /* low-res chroma */
00463     deltas[0] = GET_TOK(ctx, TM2_C_LO);
00464     deltas[1] = deltas[2] = deltas[3] = 0;
00465     tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
00466 
00467     deltas[0] = GET_TOK(ctx, TM2_C_LO);
00468     deltas[1] = deltas[2] = deltas[3] = 0;
00469     tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
00470 
00471     /* hi-res luma */
00472     for(i = 0; i < 16; i++)
00473         deltas[i] = GET_TOK(ctx, TM2_L_HI);
00474 
00475     tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
00476 }
00477 
00478 static inline void tm2_low_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
00479 {
00480     int i;
00481     int t1, t2;
00482     int deltas[16];
00483     TM2_INIT_POINTERS();
00484 
00485     /* low-res chroma */
00486     deltas[0] = GET_TOK(ctx, TM2_C_LO);
00487     deltas[1] = deltas[2] = deltas[3] = 0;
00488     tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
00489 
00490     deltas[0] = GET_TOK(ctx, TM2_C_LO);
00491     deltas[1] = deltas[2] = deltas[3] = 0;
00492     tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
00493 
00494     /* low-res luma */
00495     for(i = 0; i < 16; i++)
00496         deltas[i] = 0;
00497 
00498     deltas[ 0] = GET_TOK(ctx, TM2_L_LO);
00499     deltas[ 2] = GET_TOK(ctx, TM2_L_LO);
00500     deltas[ 8] = GET_TOK(ctx, TM2_L_LO);
00501     deltas[10] = GET_TOK(ctx, TM2_L_LO);
00502 
00503     if(bx > 0)
00504         last[0] = (last[-1] - ctx->D[0] - ctx->D[1] - ctx->D[2] - ctx->D[3] + last[1]) >> 1;
00505     else
00506         last[0] = (last[1]  - ctx->D[0] - ctx->D[1] - ctx->D[2] - ctx->D[3])>> 1;
00507     last[2] = (last[1] + last[3]) >> 1;
00508 
00509     t1 = ctx->D[0] + ctx->D[1];
00510     ctx->D[0] = t1 >> 1;
00511     ctx->D[1] = t1 - (t1 >> 1);
00512     t2 = ctx->D[2] + ctx->D[3];
00513     ctx->D[2] = t2 >> 1;
00514     ctx->D[3] = t2 - (t2 >> 1);
00515 
00516     tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
00517 }
00518 
00519 static inline void tm2_null_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
00520 {
00521     int i;
00522     int ct;
00523     int left, right, diff;
00524     int deltas[16];
00525     TM2_INIT_POINTERS();
00526 
00527     /* null chroma */
00528     deltas[0] = deltas[1] = deltas[2] = deltas[3] = 0;
00529     tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
00530 
00531     deltas[0] = deltas[1] = deltas[2] = deltas[3] = 0;
00532     tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
00533 
00534     /* null luma */
00535     for(i = 0; i < 16; i++)
00536         deltas[i] = 0;
00537 
00538     ct = ctx->D[0] + ctx->D[1] + ctx->D[2] + ctx->D[3];
00539 
00540     if(bx > 0)
00541         left = last[-1] - ct;
00542     else
00543         left = 0;
00544 
00545     right = last[3];
00546     diff = right - left;
00547     last[0] = left + (diff >> 2);
00548     last[1] = left + (diff >> 1);
00549     last[2] = right - (diff >> 2);
00550     last[3] = right;
00551     {
00552         int tp = left;
00553 
00554         ctx->D[0] = (tp + (ct >> 2)) - left;
00555         left += ctx->D[0];
00556         ctx->D[1] = (tp + (ct >> 1)) - left;
00557         left += ctx->D[1];
00558         ctx->D[2] = ((tp + ct) - (ct >> 2)) - left;
00559         left += ctx->D[2];
00560         ctx->D[3] = (tp + ct) - left;
00561     }
00562     tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
00563 }
00564 
00565 static inline void tm2_still_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
00566 {
00567     int i, j;
00568     TM2_INIT_POINTERS_2();
00569 
00570     /* update chroma */
00571     for(j = 0; j < 2; j++){
00572         for(i = 0; i < 2; i++){
00573             U[i] = Uo[i];
00574             V[i] = Vo[i];
00575         }
00576         U += Ustride; V += Vstride;
00577         Uo += oUstride; Vo += oVstride;
00578     }
00579     U -= Ustride * 2;
00580     V -= Vstride * 2;
00581     TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
00582     TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
00583 
00584     /* update deltas */
00585     ctx->D[0] = Yo[3] - last[3];
00586     ctx->D[1] = Yo[3 + oYstride] - Yo[3];
00587     ctx->D[2] = Yo[3 + oYstride * 2] - Yo[3 + oYstride];
00588     ctx->D[3] = Yo[3 + oYstride * 3] - Yo[3 + oYstride * 2];
00589 
00590     for(j = 0; j < 4; j++){
00591         for(i = 0; i < 4; i++){
00592             Y[i] = Yo[i];
00593             last[i] = Yo[i];
00594         }
00595         Y += Ystride;
00596         Yo += oYstride;
00597     }
00598 }
00599 
00600 static inline void tm2_update_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
00601 {
00602     int i, j;
00603     int d;
00604     TM2_INIT_POINTERS_2();
00605 
00606     /* update chroma */
00607     for(j = 0; j < 2; j++){
00608         for(i = 0; i < 2; i++){
00609             U[i] = Uo[i] + GET_TOK(ctx, TM2_UPD);
00610             V[i] = Vo[i] + GET_TOK(ctx, TM2_UPD);
00611         }
00612         U += Ustride; V += Vstride;
00613         Uo += oUstride; Vo += oVstride;
00614     }
00615     U -= Ustride * 2;
00616     V -= Vstride * 2;
00617     TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
00618     TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
00619 
00620     /* update deltas */
00621     ctx->D[0] = Yo[3] - last[3];
00622     ctx->D[1] = Yo[3 + oYstride] - Yo[3];
00623     ctx->D[2] = Yo[3 + oYstride * 2] - Yo[3 + oYstride];
00624     ctx->D[3] = Yo[3 + oYstride * 3] - Yo[3 + oYstride * 2];
00625 
00626     for(j = 0; j < 4; j++){
00627         d = last[3];
00628         for(i = 0; i < 4; i++){
00629             Y[i] = Yo[i] + GET_TOK(ctx, TM2_UPD);
00630             last[i] = Y[i];
00631         }
00632         ctx->D[j] = last[3] - d;
00633         Y += Ystride;
00634         Yo += oYstride;
00635     }
00636 }
00637 
00638 static inline void tm2_motion_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
00639 {
00640     int i, j;
00641     int mx, my;
00642     TM2_INIT_POINTERS_2();
00643 
00644     mx = GET_TOK(ctx, TM2_MOT);
00645     my = GET_TOK(ctx, TM2_MOT);
00646 
00647     Yo += my * oYstride + mx;
00648     Uo += (my >> 1) * oUstride + (mx >> 1);
00649     Vo += (my >> 1) * oVstride + (mx >> 1);
00650 
00651     /* copy chroma */
00652     for(j = 0; j < 2; j++){
00653         for(i = 0; i < 2; i++){
00654             U[i] = Uo[i];
00655             V[i] = Vo[i];
00656         }
00657         U += Ustride; V += Vstride;
00658         Uo += oUstride; Vo += oVstride;
00659     }
00660     U -= Ustride * 2;
00661     V -= Vstride * 2;
00662     TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
00663     TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
00664 
00665     /* copy luma */
00666     for(j = 0; j < 4; j++){
00667         for(i = 0; i < 4; i++){
00668             Y[i] = Yo[i];
00669         }
00670         Y += Ystride;
00671         Yo += oYstride;
00672     }
00673     /* calculate deltas */
00674     Y -= Ystride * 4;
00675     ctx->D[0] = Y[3] - last[3];
00676     ctx->D[1] = Y[3 + Ystride] - Y[3];
00677     ctx->D[2] = Y[3 + Ystride * 2] - Y[3 + Ystride];
00678     ctx->D[3] = Y[3 + Ystride * 3] - Y[3 + Ystride * 2];
00679     for(i = 0; i < 4; i++)
00680         last[i] = Y[i + Ystride * 3];
00681 }
00682 
00683 static int tm2_decode_blocks(TM2Context *ctx, AVFrame *p)
00684 {
00685     int i, j;
00686     int bw, bh;
00687     int type;
00688     int keyframe = 1;
00689     int *Y, *U, *V;
00690     uint8_t *dst;
00691 
00692     bw = ctx->avctx->width >> 2;
00693     bh = ctx->avctx->height >> 2;
00694 
00695     for(i = 0; i < TM2_NUM_STREAMS; i++)
00696         ctx->tok_ptrs[i] = 0;
00697 
00698     if (ctx->tok_lens[TM2_TYPE]<bw*bh){
00699         av_log(ctx->avctx,AV_LOG_ERROR,"Got %i tokens for %i blocks\n",ctx->tok_lens[TM2_TYPE],bw*bh);
00700         return -1;
00701     }
00702 
00703     memset(ctx->last, 0, 4 * bw * sizeof(int));
00704     memset(ctx->clast, 0, 4 * bw * sizeof(int));
00705 
00706     for(j = 0; j < bh; j++) {
00707         memset(ctx->D, 0, 4 * sizeof(int));
00708         memset(ctx->CD, 0, 4 * sizeof(int));
00709         for(i = 0; i < bw; i++) {
00710             type = GET_TOK(ctx, TM2_TYPE);
00711             switch(type) {
00712             case TM2_HI_RES:
00713                 tm2_hi_res_block(ctx, p, i, j);
00714                 break;
00715             case TM2_MED_RES:
00716                 tm2_med_res_block(ctx, p, i, j);
00717                 break;
00718             case TM2_LOW_RES:
00719                 tm2_low_res_block(ctx, p, i, j);
00720                 break;
00721             case TM2_NULL_RES:
00722                 tm2_null_res_block(ctx, p, i, j);
00723                 break;
00724             case TM2_UPDATE:
00725                 tm2_update_block(ctx, p, i, j);
00726                 keyframe = 0;
00727                 break;
00728             case TM2_STILL:
00729                 tm2_still_block(ctx, p, i, j);
00730                 keyframe = 0;
00731                 break;
00732             case TM2_MOTION:
00733                 tm2_motion_block(ctx, p, i, j);
00734                 keyframe = 0;
00735                 break;
00736             default:
00737                 av_log(ctx->avctx, AV_LOG_ERROR, "Skipping unknown block type %i\n", type);
00738             }
00739         }
00740     }
00741 
00742     /* copy data from our buffer to AVFrame */
00743     Y = (ctx->cur?ctx->Y2:ctx->Y1);
00744     U = (ctx->cur?ctx->U2:ctx->U1);
00745     V = (ctx->cur?ctx->V2:ctx->V1);
00746     dst = p->data[0];
00747     for(j = 0; j < ctx->avctx->height; j++){
00748         for(i = 0; i < ctx->avctx->width; i++){
00749             int y = Y[i], u = U[i >> 1], v = V[i >> 1];
00750             dst[3*i+0] = av_clip_uint8(y + v);
00751             dst[3*i+1] = av_clip_uint8(y);
00752             dst[3*i+2] = av_clip_uint8(y + u);
00753         }
00754         Y += ctx->avctx->width;
00755         if (j & 1) {
00756             U += ctx->avctx->width >> 1;
00757             V += ctx->avctx->width >> 1;
00758         }
00759         dst += p->linesize[0];
00760     }
00761 
00762     return keyframe;
00763 }
00764 
00765 static const int tm2_stream_order[TM2_NUM_STREAMS] = {
00766     TM2_C_HI, TM2_C_LO, TM2_L_HI, TM2_L_LO, TM2_UPD, TM2_MOT, TM2_TYPE
00767 };
00768 
00769 static int decode_frame(AVCodecContext *avctx,
00770                         void *data, int *data_size,
00771                         AVPacket *avpkt)
00772 {
00773     const uint8_t *buf = avpkt->data;
00774     int buf_size = avpkt->size;
00775     TM2Context * const l = avctx->priv_data;
00776     AVFrame * const p= (AVFrame*)&l->pic;
00777     int i, skip, t;
00778     uint8_t *swbuf;
00779 
00780     swbuf = av_malloc(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
00781     if(!swbuf){
00782         av_log(avctx, AV_LOG_ERROR, "Cannot allocate temporary buffer\n");
00783         return -1;
00784     }
00785     p->reference = 1;
00786     p->buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
00787     if(avctx->reget_buffer(avctx, p) < 0){
00788         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00789         av_free(swbuf);
00790         return -1;
00791     }
00792 
00793     l->dsp.bswap_buf((uint32_t*)swbuf, (const uint32_t*)buf, buf_size >> 2);
00794     skip = tm2_read_header(l, swbuf);
00795 
00796     if(skip == -1){
00797         av_free(swbuf);
00798         return -1;
00799     }
00800 
00801     for(i = 0; i < TM2_NUM_STREAMS; i++){
00802         t = tm2_read_stream(l, swbuf + skip, tm2_stream_order[i], buf_size);
00803         if(t == -1){
00804             av_free(swbuf);
00805             return -1;
00806         }
00807         skip += t;
00808     }
00809     p->key_frame = tm2_decode_blocks(l, p);
00810     if(p->key_frame)
00811         p->pict_type = FF_I_TYPE;
00812     else
00813         p->pict_type = FF_P_TYPE;
00814 
00815     l->cur = !l->cur;
00816     *data_size = sizeof(AVFrame);
00817     *(AVFrame*)data = l->pic;
00818     av_free(swbuf);
00819 
00820     return buf_size;
00821 }
00822 
00823 static av_cold int decode_init(AVCodecContext *avctx){
00824     TM2Context * const l = avctx->priv_data;
00825     int i;
00826 
00827     if((avctx->width & 3) || (avctx->height & 3)){
00828         av_log(avctx, AV_LOG_ERROR, "Width and height must be multiple of 4\n");
00829         return -1;
00830     }
00831 
00832     l->avctx = avctx;
00833     l->pic.data[0]=NULL;
00834     avctx->pix_fmt = PIX_FMT_BGR24;
00835 
00836     dsputil_init(&l->dsp, avctx);
00837 
00838     l->last = av_malloc(4 * sizeof(int) * (avctx->width >> 2));
00839     l->clast = av_malloc(4 * sizeof(int) * (avctx->width >> 2));
00840 
00841     for(i = 0; i < TM2_NUM_STREAMS; i++) {
00842         l->tokens[i] = NULL;
00843         l->tok_lens[i] = 0;
00844     }
00845 
00846     l->Y1 = av_malloc(sizeof(int) * avctx->width * avctx->height);
00847     l->U1 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));
00848     l->V1 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));
00849     l->Y2 = av_malloc(sizeof(int) * avctx->width * avctx->height);
00850     l->U2 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));
00851     l->V2 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));
00852     l->cur = 0;
00853 
00854     return 0;
00855 }
00856 
00857 static av_cold int decode_end(AVCodecContext *avctx){
00858     TM2Context * const l = avctx->priv_data;
00859     AVFrame *pic = &l->pic;
00860     int i;
00861 
00862     if(l->last)
00863         av_free(l->last);
00864     if(l->clast)
00865         av_free(l->clast);
00866     for(i = 0; i < TM2_NUM_STREAMS; i++)
00867         if(l->tokens[i])
00868             av_free(l->tokens[i]);
00869     if(l->Y1){
00870         av_free(l->Y1);
00871         av_free(l->U1);
00872         av_free(l->V1);
00873         av_free(l->Y2);
00874         av_free(l->U2);
00875         av_free(l->V2);
00876     }
00877 
00878     if (pic->data[0])
00879         avctx->release_buffer(avctx, pic);
00880 
00881     return 0;
00882 }
00883 
00884 AVCodec truemotion2_decoder = {
00885     "truemotion2",
00886     AVMEDIA_TYPE_VIDEO,
00887     CODEC_ID_TRUEMOTION2,
00888     sizeof(TM2Context),
00889     decode_init,
00890     NULL,
00891     decode_end,
00892     decode_frame,
00893     CODEC_CAP_DR1,
00894     .long_name = NULL_IF_CONFIG_SMALL("Duck TrueMotion 2.0"),
00895 };