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 "bytestream.h"
00029 #include "get_bits.h"
00030 #include "dsputil.h"
00031 
00032 #define TM2_ESCAPE 0x80000000
00033 #define TM2_DELTAS 64
00034 /* Huffman-coded streams of different types of blocks */
00035 enum TM2_STREAMS{ TM2_C_HI = 0, TM2_C_LO, TM2_L_HI, TM2_L_LO,
00036      TM2_UPD, TM2_MOT, TM2_TYPE, TM2_NUM_STREAMS};
00037 /* Block types */
00038 enum TM2_BLOCKS{ TM2_HI_RES = 0, TM2_MED_RES, TM2_LOW_RES, TM2_NULL_RES,
00039                  TM2_UPDATE, TM2_STILL, TM2_MOTION};
00040 
00041 typedef struct TM2Context{
00042     AVCodecContext *avctx;
00043     AVFrame pic;
00044 
00045     GetBitContext gb;
00046     DSPContext dsp;
00047 
00048     uint8_t *buffer;
00049     int buffer_size;
00050 
00051     /* TM2 streams */
00052     int *tokens[TM2_NUM_STREAMS];
00053     int tok_lens[TM2_NUM_STREAMS];
00054     int tok_ptrs[TM2_NUM_STREAMS];
00055     int deltas[TM2_NUM_STREAMS][TM2_DELTAS];
00056     /* for blocks decoding */
00057     int D[4];
00058     int CD[4];
00059     int *last;
00060     int *clast;
00061 
00062     /* data for current and previous frame */
00063     int *Y1_base, *U1_base, *V1_base, *Y2_base, *U2_base, *V2_base;
00064     int *Y1, *U1, *V1, *Y2, *U2, *V2;
00065     int y_stride, uv_stride;
00066     int cur;
00067 } TM2Context;
00068 
00072 typedef struct TM2Codes{
00073     VLC vlc; 
00074     int bits;
00075     int *recode; 
00076     int length;
00077 } TM2Codes;
00078 
00082 typedef struct TM2Huff{
00083     int val_bits; 
00084     int max_bits; 
00085     int min_bits; 
00086     int nodes; 
00087     int num; 
00088     int max_num; 
00089     int *nums; 
00090     uint32_t *bits; 
00091     int *lens; 
00092 } TM2Huff;
00093 
00094 static int tm2_read_tree(TM2Context *ctx, uint32_t prefix, int length, TM2Huff *huff)
00095 {
00096     if(length > huff->max_bits) {
00097         av_log(ctx->avctx, AV_LOG_ERROR, "Tree exceeded its given depth (%i)\n", huff->max_bits);
00098         return -1;
00099     }
00100 
00101     if(!get_bits1(&ctx->gb)) { /* literal */
00102         if (length == 0) {
00103             length = 1;
00104         }
00105         if(huff->num >= huff->max_num) {
00106             av_log(ctx->avctx, AV_LOG_DEBUG, "Too many literals\n");
00107             return -1;
00108         }
00109         huff->nums[huff->num] = get_bits_long(&ctx->gb, huff->val_bits);
00110         huff->bits[huff->num] = prefix;
00111         huff->lens[huff->num] = length;
00112         huff->num++;
00113         return 0;
00114     } else { /* non-terminal node */
00115         if(tm2_read_tree(ctx, prefix << 1, length + 1, huff) == -1)
00116             return -1;
00117         if(tm2_read_tree(ctx, (prefix << 1) | 1, length + 1, huff) == -1)
00118             return -1;
00119     }
00120     return 0;
00121 }
00122 
00123 static int tm2_build_huff_table(TM2Context *ctx, TM2Codes *code)
00124 {
00125     TM2Huff huff;
00126     int res = 0;
00127 
00128     huff.val_bits = get_bits(&ctx->gb, 5);
00129     huff.max_bits = get_bits(&ctx->gb, 5);
00130     huff.min_bits = get_bits(&ctx->gb, 5);
00131     huff.nodes = get_bits_long(&ctx->gb, 17);
00132     huff.num = 0;
00133 
00134     /* check for correct codes parameters */
00135     if((huff.val_bits < 1) || (huff.val_bits > 32) ||
00136        (huff.max_bits < 0) || (huff.max_bits > 25)) {
00137         av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect tree parameters - literal length: %i, max code length: %i\n",
00138                huff.val_bits, huff.max_bits);
00139         return -1;
00140     }
00141     if((huff.nodes <= 0) || (huff.nodes > 0x10000)) {
00142         av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of Huffman tree nodes: %i\n", huff.nodes);
00143         return -1;
00144     }
00145     /* one-node tree */
00146     if(huff.max_bits == 0)
00147         huff.max_bits = 1;
00148 
00149     /* allocate space for codes - it is exactly ceil(nodes / 2) entries */
00150     huff.max_num = (huff.nodes + 1) >> 1;
00151     huff.nums = av_mallocz(huff.max_num * sizeof(int));
00152     huff.bits = av_mallocz(huff.max_num * sizeof(uint32_t));
00153     huff.lens = av_mallocz(huff.max_num * sizeof(int));
00154 
00155     if(tm2_read_tree(ctx, 0, 0, &huff) == -1)
00156         res = -1;
00157 
00158     if(huff.num != huff.max_num) {
00159         av_log(ctx->avctx, AV_LOG_ERROR, "Got less codes than expected: %i of %i\n",
00160                huff.num, huff.max_num);
00161         res = -1;
00162     }
00163 
00164     /* convert codes to vlc_table */
00165     if(res != -1) {
00166         int i;
00167 
00168         res = init_vlc(&code->vlc, huff.max_bits, huff.max_num,
00169                     huff.lens, sizeof(int), sizeof(int),
00170                     huff.bits, sizeof(uint32_t), sizeof(uint32_t), 0);
00171         if(res < 0) {
00172             av_log(ctx->avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
00173             res = -1;
00174         } else
00175             res = 0;
00176         if(res != -1) {
00177             code->bits = huff.max_bits;
00178             code->length = huff.max_num;
00179             code->recode = av_malloc(code->length * sizeof(int));
00180             for(i = 0; i < code->length; i++)
00181                 code->recode[i] = huff.nums[i];
00182         }
00183     }
00184     /* free allocated memory */
00185     av_free(huff.nums);
00186     av_free(huff.bits);
00187     av_free(huff.lens);
00188 
00189     return res;
00190 }
00191 
00192 static void tm2_free_codes(TM2Codes *code)
00193 {
00194     av_free(code->recode);
00195     if(code->vlc.table)
00196         ff_free_vlc(&code->vlc);
00197 }
00198 
00199 static inline int tm2_get_token(GetBitContext *gb, TM2Codes *code)
00200 {
00201     int val;
00202     val = get_vlc2(gb, code->vlc.table, code->bits, 1);
00203     return code->recode[val];
00204 }
00205 
00206 static inline int tm2_read_header(TM2Context *ctx, const uint8_t *buf)
00207 {
00208     uint32_t magic;
00209     const uint8_t *obuf;
00210 
00211     obuf = buf;
00212 
00213     magic = AV_RL32(buf);
00214     buf += 4;
00215 
00216     if(magic == 0x00000100) { /* old header */
00217 /*      av_log (ctx->avctx, AV_LOG_ERROR, "TM2 old header: not implemented (yet)\n"); */
00218         return 40;
00219     } else if(magic == 0x00000101) { /* new header */
00220         return 40;
00221     } else {
00222         av_log (ctx->avctx, AV_LOG_ERROR, "Not a TM2 header: 0x%08X\n", magic);
00223         return -1;
00224     }
00225 }
00226 
00227 static int tm2_read_deltas(TM2Context *ctx, int stream_id) {
00228     int d, mb;
00229     int i, v;
00230 
00231     d = get_bits(&ctx->gb, 9);
00232     mb = get_bits(&ctx->gb, 5);
00233 
00234     if((d < 1) || (d > TM2_DELTAS) || (mb < 1) || (mb > 32)) {
00235         av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect delta table: %i deltas x %i bits\n", d, mb);
00236         return -1;
00237     }
00238 
00239     for(i = 0; i < d; i++) {
00240         v = get_bits_long(&ctx->gb, mb);
00241         if(v & (1 << (mb - 1)))
00242             ctx->deltas[stream_id][i] = v - (1 << mb);
00243         else
00244             ctx->deltas[stream_id][i] = v;
00245     }
00246     for(; i < TM2_DELTAS; i++)
00247         ctx->deltas[stream_id][i] = 0;
00248 
00249     return 0;
00250 }
00251 
00252 static int tm2_read_stream(TM2Context *ctx, const uint8_t *buf, int stream_id, int buf_size)
00253 {
00254     int i;
00255     int skip = 0;
00256     int len, toks, pos;
00257     TM2Codes codes;
00258     GetByteContext gb;
00259 
00260     /* get stream length in dwords */
00261     bytestream2_init(&gb, buf, buf_size);
00262     len  = bytestream2_get_be32(&gb);
00263     skip = len * 4 + 4;
00264 
00265     if(len == 0)
00266         return 4;
00267 
00268     if (len >= INT_MAX/4-1 || len < 0 || len > buf_size) {
00269         av_log(ctx->avctx, AV_LOG_ERROR, "Error, invalid stream size.\n");
00270         return -1;
00271     }
00272 
00273     toks = bytestream2_get_be32(&gb);
00274     if(toks & 1) {
00275         len = bytestream2_get_be32(&gb);
00276         if(len == TM2_ESCAPE) {
00277             len = bytestream2_get_be32(&gb);
00278         }
00279         if(len > 0) {
00280             pos = bytestream2_tell(&gb);
00281             if (skip <= pos)
00282                 return -1;
00283             init_get_bits(&ctx->gb, buf + pos, (skip - pos) * 8);
00284             if(tm2_read_deltas(ctx, stream_id) == -1)
00285                 return -1;
00286             bytestream2_skip(&gb, ((get_bits_count(&ctx->gb) + 31) >> 5) << 2);
00287         }
00288     }
00289     /* skip unused fields */
00290     len = bytestream2_get_be32(&gb);
00291     if(len == TM2_ESCAPE) { /* some unknown length - could be escaped too */
00292         bytestream2_skip(&gb, 8); /* unused by decoder */
00293     } else {
00294         bytestream2_skip(&gb, 4); /* unused by decoder */
00295     }
00296 
00297     pos = bytestream2_tell(&gb);
00298     if (skip <= pos)
00299         return -1;
00300     init_get_bits(&ctx->gb, buf + pos, (skip - pos) * 8);
00301     if(tm2_build_huff_table(ctx, &codes) == -1)
00302         return -1;
00303     bytestream2_skip(&gb, ((get_bits_count(&ctx->gb) + 31) >> 5) << 2);
00304 
00305     toks >>= 1;
00306     /* check if we have sane number of tokens */
00307     if((toks < 0) || (toks > 0xFFFFFF)){
00308         av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of tokens: %i\n", toks);
00309         tm2_free_codes(&codes);
00310         return -1;
00311     }
00312     ctx->tokens[stream_id] = av_realloc(ctx->tokens[stream_id], toks * sizeof(int));
00313     ctx->tok_lens[stream_id] = toks;
00314     len = bytestream2_get_be32(&gb);
00315     if(len > 0) {
00316         pos = bytestream2_tell(&gb);
00317         if (skip <= pos)
00318             return -1;
00319         init_get_bits(&ctx->gb, buf + pos, (skip - pos) * 8);
00320         for(i = 0; i < toks; i++) {
00321             if (get_bits_left(&ctx->gb) <= 0) {
00322                 av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of tokens: %i\n", toks);
00323                 return -1;
00324             }
00325             ctx->tokens[stream_id][i] = tm2_get_token(&ctx->gb, &codes);
00326             if (stream_id <= TM2_MOT && ctx->tokens[stream_id][i] >= TM2_DELTAS) {
00327                 av_log(ctx->avctx, AV_LOG_ERROR, "Invalid delta token index %d for type %d, n=%d\n",
00328                        ctx->tokens[stream_id][i], stream_id, i);
00329                 return AVERROR_INVALIDDATA;
00330             }
00331         }
00332     } else {
00333         for(i = 0; i < toks; i++) {
00334             ctx->tokens[stream_id][i] = codes.recode[0];
00335             if (stream_id <= TM2_MOT && ctx->tokens[stream_id][i] >= TM2_DELTAS) {
00336                 av_log(ctx->avctx, AV_LOG_ERROR, "Invalid delta token index %d for type %d, n=%d\n",
00337                        ctx->tokens[stream_id][i], stream_id, i);
00338                 return AVERROR_INVALIDDATA;
00339             }
00340         }
00341     }
00342     tm2_free_codes(&codes);
00343 
00344     return skip;
00345 }
00346 
00347 static inline int GET_TOK(TM2Context *ctx,int type) {
00348     if(ctx->tok_ptrs[type] >= ctx->tok_lens[type]) {
00349         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]);
00350         return 0;
00351     }
00352     if(type <= TM2_MOT)
00353         return ctx->deltas[type][ctx->tokens[type][ctx->tok_ptrs[type]++]];
00354     return ctx->tokens[type][ctx->tok_ptrs[type]++];
00355 }
00356 
00357 /* blocks decoding routines */
00358 
00359 /* common Y, U, V pointers initialisation */
00360 #define TM2_INIT_POINTERS() \
00361     int *last, *clast; \
00362     int *Y, *U, *V;\
00363     int Ystride, Ustride, Vstride;\
00364 \
00365     Ystride = ctx->y_stride;\
00366     Vstride = ctx->uv_stride;\
00367     Ustride = ctx->uv_stride;\
00368     Y = (ctx->cur?ctx->Y2:ctx->Y1) + by * 4 * Ystride + bx * 4;\
00369     V = (ctx->cur?ctx->V2:ctx->V1) + by * 2 * Vstride + bx * 2;\
00370     U = (ctx->cur?ctx->U2:ctx->U1) + by * 2 * Ustride + bx * 2;\
00371     last = ctx->last + bx * 4;\
00372     clast = ctx->clast + bx * 4;
00373 
00374 #define TM2_INIT_POINTERS_2() \
00375     int *Yo, *Uo, *Vo;\
00376     int oYstride, oUstride, oVstride;\
00377 \
00378     TM2_INIT_POINTERS();\
00379     oYstride = Ystride;\
00380     oVstride = Vstride;\
00381     oUstride = Ustride;\
00382     Yo = (ctx->cur?ctx->Y1:ctx->Y2) + by * 4 * oYstride + bx * 4;\
00383     Vo = (ctx->cur?ctx->V1:ctx->V2) + by * 2 * oVstride + bx * 2;\
00384     Uo = (ctx->cur?ctx->U1:ctx->U2) + by * 2 * oUstride + bx * 2;
00385 
00386 /* recalculate last and delta values for next blocks */
00387 #define TM2_RECALC_BLOCK(CHR, stride, last, CD) {\
00388     CD[0] = CHR[1] - last[1];\
00389     CD[1] = (int)CHR[stride + 1] - (int)CHR[1];\
00390     last[0] = (int)CHR[stride + 0];\
00391     last[1] = (int)CHR[stride + 1];}
00392 
00393 /* common operations - add deltas to 4x4 block of luma or 2x2 blocks of chroma */
00394 static inline void tm2_apply_deltas(TM2Context *ctx, int* Y, int stride, int *deltas, int *last)
00395 {
00396     int ct, d;
00397     int i, j;
00398 
00399     for(j = 0; j < 4; j++){
00400         ct = ctx->D[j];
00401         for(i = 0; i < 4; i++){
00402             d = deltas[i + j * 4];
00403             ct += d;
00404             last[i] += ct;
00405             Y[i] = av_clip_uint8(last[i]);
00406         }
00407         Y += stride;
00408         ctx->D[j] = ct;
00409     }
00410 }
00411 
00412 static inline void tm2_high_chroma(int *data, int stride, int *last, int *CD, int *deltas)
00413 {
00414     int i, j;
00415     for(j = 0; j < 2; j++){
00416         for(i = 0; i < 2; i++){
00417             CD[j] += deltas[i + j * 2];
00418             last[i] += CD[j];
00419             data[i] = last[i];
00420         }
00421         data += stride;
00422     }
00423 }
00424 
00425 static inline void tm2_low_chroma(int *data, int stride, int *clast, int *CD, int *deltas, int bx)
00426 {
00427     int t;
00428     int l;
00429     int prev;
00430 
00431     if(bx > 0)
00432         prev = clast[-3];
00433     else
00434         prev = 0;
00435     t = (CD[0] + CD[1]) >> 1;
00436     l = (prev - CD[0] - CD[1] + clast[1]) >> 1;
00437     CD[1] = CD[0] + CD[1] - t;
00438     CD[0] = t;
00439     clast[0] = l;
00440 
00441     tm2_high_chroma(data, stride, clast, CD, deltas);
00442 }
00443 
00444 static inline void tm2_hi_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
00445 {
00446     int i;
00447     int deltas[16];
00448     TM2_INIT_POINTERS();
00449 
00450     /* hi-res chroma */
00451     for(i = 0; i < 4; i++) {
00452         deltas[i] = GET_TOK(ctx, TM2_C_HI);
00453         deltas[i + 4] = GET_TOK(ctx, TM2_C_HI);
00454     }
00455     tm2_high_chroma(U, Ustride, clast, ctx->CD, deltas);
00456     tm2_high_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas + 4);
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_med_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
00466 {
00467     int i;
00468     int deltas[16];
00469     TM2_INIT_POINTERS();
00470 
00471     /* low-res chroma */
00472     deltas[0] = GET_TOK(ctx, TM2_C_LO);
00473     deltas[1] = deltas[2] = deltas[3] = 0;
00474     tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
00475 
00476     deltas[0] = GET_TOK(ctx, TM2_C_LO);
00477     deltas[1] = deltas[2] = deltas[3] = 0;
00478     tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
00479 
00480     /* hi-res luma */
00481     for(i = 0; i < 16; i++)
00482         deltas[i] = GET_TOK(ctx, TM2_L_HI);
00483 
00484     tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
00485 }
00486 
00487 static inline void tm2_low_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
00488 {
00489     int i;
00490     int t1, t2;
00491     int deltas[16];
00492     TM2_INIT_POINTERS();
00493 
00494     /* low-res chroma */
00495     deltas[0] = GET_TOK(ctx, TM2_C_LO);
00496     deltas[1] = deltas[2] = deltas[3] = 0;
00497     tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
00498 
00499     deltas[0] = GET_TOK(ctx, TM2_C_LO);
00500     deltas[1] = deltas[2] = deltas[3] = 0;
00501     tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
00502 
00503     /* low-res luma */
00504     for(i = 0; i < 16; i++)
00505         deltas[i] = 0;
00506 
00507     deltas[ 0] = GET_TOK(ctx, TM2_L_LO);
00508     deltas[ 2] = GET_TOK(ctx, TM2_L_LO);
00509     deltas[ 8] = GET_TOK(ctx, TM2_L_LO);
00510     deltas[10] = GET_TOK(ctx, TM2_L_LO);
00511 
00512     if(bx > 0)
00513         last[0] = (last[-1] - ctx->D[0] - ctx->D[1] - ctx->D[2] - ctx->D[3] + last[1]) >> 1;
00514     else
00515         last[0] = (last[1]  - ctx->D[0] - ctx->D[1] - ctx->D[2] - ctx->D[3])>> 1;
00516     last[2] = (last[1] + last[3]) >> 1;
00517 
00518     t1 = ctx->D[0] + ctx->D[1];
00519     ctx->D[0] = t1 >> 1;
00520     ctx->D[1] = t1 - (t1 >> 1);
00521     t2 = ctx->D[2] + ctx->D[3];
00522     ctx->D[2] = t2 >> 1;
00523     ctx->D[3] = t2 - (t2 >> 1);
00524 
00525     tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
00526 }
00527 
00528 static inline void tm2_null_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
00529 {
00530     int i;
00531     int ct;
00532     int left, right, diff;
00533     int deltas[16];
00534     TM2_INIT_POINTERS();
00535 
00536     /* null chroma */
00537     deltas[0] = deltas[1] = deltas[2] = deltas[3] = 0;
00538     tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
00539 
00540     deltas[0] = deltas[1] = deltas[2] = deltas[3] = 0;
00541     tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
00542 
00543     /* null luma */
00544     for(i = 0; i < 16; i++)
00545         deltas[i] = 0;
00546 
00547     ct = ctx->D[0] + ctx->D[1] + ctx->D[2] + ctx->D[3];
00548 
00549     if(bx > 0)
00550         left = last[-1] - ct;
00551     else
00552         left = 0;
00553 
00554     right = last[3];
00555     diff = right - left;
00556     last[0] = left + (diff >> 2);
00557     last[1] = left + (diff >> 1);
00558     last[2] = right - (diff >> 2);
00559     last[3] = right;
00560     {
00561         int tp = left;
00562 
00563         ctx->D[0] = (tp + (ct >> 2)) - left;
00564         left += ctx->D[0];
00565         ctx->D[1] = (tp + (ct >> 1)) - left;
00566         left += ctx->D[1];
00567         ctx->D[2] = ((tp + ct) - (ct >> 2)) - left;
00568         left += ctx->D[2];
00569         ctx->D[3] = (tp + ct) - left;
00570     }
00571     tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
00572 }
00573 
00574 static inline void tm2_still_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
00575 {
00576     int i, j;
00577     TM2_INIT_POINTERS_2();
00578 
00579     /* update chroma */
00580     for(j = 0; j < 2; j++){
00581         for(i = 0; i < 2; i++){
00582             U[i] = Uo[i];
00583             V[i] = Vo[i];
00584         }
00585         U += Ustride; V += Vstride;
00586         Uo += oUstride; Vo += oVstride;
00587     }
00588     U -= Ustride * 2;
00589     V -= Vstride * 2;
00590     TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
00591     TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
00592 
00593     /* update deltas */
00594     ctx->D[0] = Yo[3] - last[3];
00595     ctx->D[1] = Yo[3 + oYstride] - Yo[3];
00596     ctx->D[2] = Yo[3 + oYstride * 2] - Yo[3 + oYstride];
00597     ctx->D[3] = Yo[3 + oYstride * 3] - Yo[3 + oYstride * 2];
00598 
00599     for(j = 0; j < 4; j++){
00600         for(i = 0; i < 4; i++){
00601             Y[i] = Yo[i];
00602             last[i] = Yo[i];
00603         }
00604         Y += Ystride;
00605         Yo += oYstride;
00606     }
00607 }
00608 
00609 static inline void tm2_update_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
00610 {
00611     int i, j;
00612     int d;
00613     TM2_INIT_POINTERS_2();
00614 
00615     /* update chroma */
00616     for(j = 0; j < 2; j++){
00617         for(i = 0; i < 2; i++){
00618             U[i] = Uo[i] + GET_TOK(ctx, TM2_UPD);
00619             V[i] = Vo[i] + GET_TOK(ctx, TM2_UPD);
00620         }
00621         U += Ustride; V += Vstride;
00622         Uo += oUstride; Vo += oVstride;
00623     }
00624     U -= Ustride * 2;
00625     V -= Vstride * 2;
00626     TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
00627     TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
00628 
00629     /* update deltas */
00630     ctx->D[0] = Yo[3] - last[3];
00631     ctx->D[1] = Yo[3 + oYstride] - Yo[3];
00632     ctx->D[2] = Yo[3 + oYstride * 2] - Yo[3 + oYstride];
00633     ctx->D[3] = Yo[3 + oYstride * 3] - Yo[3 + oYstride * 2];
00634 
00635     for(j = 0; j < 4; j++){
00636         d = last[3];
00637         for(i = 0; i < 4; i++){
00638             Y[i] = Yo[i] + GET_TOK(ctx, TM2_UPD);
00639             last[i] = Y[i];
00640         }
00641         ctx->D[j] = last[3] - d;
00642         Y += Ystride;
00643         Yo += oYstride;
00644     }
00645 }
00646 
00647 static inline void tm2_motion_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
00648 {
00649     int i, j;
00650     int mx, my;
00651     TM2_INIT_POINTERS_2();
00652 
00653     mx = GET_TOK(ctx, TM2_MOT);
00654     my = GET_TOK(ctx, TM2_MOT);
00655     mx = av_clip(mx, -(bx * 4 + 4), ctx->avctx->width  - bx * 4);
00656     my = av_clip(my, -(by * 4 + 4), ctx->avctx->height - by * 4);
00657 
00658     Yo += my * oYstride + mx;
00659     Uo += (my >> 1) * oUstride + (mx >> 1);
00660     Vo += (my >> 1) * oVstride + (mx >> 1);
00661 
00662     /* copy chroma */
00663     for(j = 0; j < 2; j++){
00664         for(i = 0; i < 2; i++){
00665             U[i] = Uo[i];
00666             V[i] = Vo[i];
00667         }
00668         U += Ustride; V += Vstride;
00669         Uo += oUstride; Vo += oVstride;
00670     }
00671     U -= Ustride * 2;
00672     V -= Vstride * 2;
00673     TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
00674     TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
00675 
00676     /* copy luma */
00677     for(j = 0; j < 4; j++){
00678         for(i = 0; i < 4; i++){
00679             Y[i] = Yo[i];
00680         }
00681         Y += Ystride;
00682         Yo += oYstride;
00683     }
00684     /* calculate deltas */
00685     Y -= Ystride * 4;
00686     ctx->D[0] = Y[3] - last[3];
00687     ctx->D[1] = Y[3 + Ystride] - Y[3];
00688     ctx->D[2] = Y[3 + Ystride * 2] - Y[3 + Ystride];
00689     ctx->D[3] = Y[3 + Ystride * 3] - Y[3 + Ystride * 2];
00690     for(i = 0; i < 4; i++)
00691         last[i] = Y[i + Ystride * 3];
00692 }
00693 
00694 static int tm2_decode_blocks(TM2Context *ctx, AVFrame *p)
00695 {
00696     int i, j;
00697     int w = ctx->avctx->width, h = ctx->avctx->height, bw = w >> 2, bh = h >> 2, cw = w >> 1;
00698     int type;
00699     int keyframe = 1;
00700     int *Y, *U, *V;
00701     uint8_t *dst;
00702 
00703     for(i = 0; i < TM2_NUM_STREAMS; i++)
00704         ctx->tok_ptrs[i] = 0;
00705 
00706     if (ctx->tok_lens[TM2_TYPE]<bw*bh){
00707         av_log(ctx->avctx,AV_LOG_ERROR,"Got %i tokens for %i blocks\n",ctx->tok_lens[TM2_TYPE],bw*bh);
00708         return -1;
00709     }
00710 
00711     memset(ctx->last, 0, 4 * bw * sizeof(int));
00712     memset(ctx->clast, 0, 4 * bw * sizeof(int));
00713 
00714     for(j = 0; j < bh; j++) {
00715         memset(ctx->D, 0, 4 * sizeof(int));
00716         memset(ctx->CD, 0, 4 * sizeof(int));
00717         for(i = 0; i < bw; i++) {
00718             type = GET_TOK(ctx, TM2_TYPE);
00719             switch(type) {
00720             case TM2_HI_RES:
00721                 tm2_hi_res_block(ctx, p, i, j);
00722                 break;
00723             case TM2_MED_RES:
00724                 tm2_med_res_block(ctx, p, i, j);
00725                 break;
00726             case TM2_LOW_RES:
00727                 tm2_low_res_block(ctx, p, i, j);
00728                 break;
00729             case TM2_NULL_RES:
00730                 tm2_null_res_block(ctx, p, i, j);
00731                 break;
00732             case TM2_UPDATE:
00733                 tm2_update_block(ctx, p, i, j);
00734                 keyframe = 0;
00735                 break;
00736             case TM2_STILL:
00737                 tm2_still_block(ctx, p, i, j);
00738                 keyframe = 0;
00739                 break;
00740             case TM2_MOTION:
00741                 tm2_motion_block(ctx, p, i, j);
00742                 keyframe = 0;
00743                 break;
00744             default:
00745                 av_log(ctx->avctx, AV_LOG_ERROR, "Skipping unknown block type %i\n", type);
00746             }
00747         }
00748     }
00749 
00750     /* copy data from our buffer to AVFrame */
00751     Y = (ctx->cur?ctx->Y2:ctx->Y1);
00752     U = (ctx->cur?ctx->U2:ctx->U1);
00753     V = (ctx->cur?ctx->V2:ctx->V1);
00754     dst = p->data[0];
00755     for(j = 0; j < h; j++){
00756         for(i = 0; i < w; i++){
00757             int y = Y[i], u = U[i >> 1], v = V[i >> 1];
00758             dst[3*i+0] = av_clip_uint8(y + v);
00759             dst[3*i+1] = av_clip_uint8(y);
00760             dst[3*i+2] = av_clip_uint8(y + u);
00761         }
00762 
00763         /* horizontal edge extension */
00764         Y[-4]    = Y[-3]    = Y[-2]    = Y[-1] = Y[0];
00765         Y[w + 3] = Y[w + 2] = Y[w + 1] = Y[w]  = Y[w - 1];
00766 
00767         /* vertical edge extension */
00768         if (j == 0) {
00769             memcpy(Y - 4 - 1 * ctx->y_stride, Y - 4, ctx->y_stride);
00770             memcpy(Y - 4 - 2 * ctx->y_stride, Y - 4, ctx->y_stride);
00771             memcpy(Y - 4 - 3 * ctx->y_stride, Y - 4, ctx->y_stride);
00772             memcpy(Y - 4 - 4 * ctx->y_stride, Y - 4, ctx->y_stride);
00773         } else if (j == h - 1) {
00774             memcpy(Y - 4 + 1 * ctx->y_stride, Y - 4, ctx->y_stride);
00775             memcpy(Y - 4 + 2 * ctx->y_stride, Y - 4, ctx->y_stride);
00776             memcpy(Y - 4 + 3 * ctx->y_stride, Y - 4, ctx->y_stride);
00777             memcpy(Y - 4 + 4 * ctx->y_stride, Y - 4, ctx->y_stride);
00778         }
00779 
00780         Y += ctx->y_stride;
00781         if (j & 1) {
00782             /* horizontal edge extension */
00783             U[-2]     = U[-1] = U[0];
00784             V[-2]     = V[-1] = V[0];
00785             U[cw + 1] = U[cw] = U[cw - 1];
00786             V[cw + 1] = V[cw] = V[cw - 1];
00787 
00788             /* vertical edge extension */
00789             if (j == 1) {
00790                 memcpy(U - 2 - 1 * ctx->uv_stride, U - 2, ctx->uv_stride);
00791                 memcpy(V - 2 - 1 * ctx->uv_stride, V - 2, ctx->uv_stride);
00792                 memcpy(U - 2 - 2 * ctx->uv_stride, U - 2, ctx->uv_stride);
00793                 memcpy(V - 2 - 2 * ctx->uv_stride, V - 2, ctx->uv_stride);
00794             } else if (j == h - 1) {
00795                 memcpy(U - 2 + 1 * ctx->uv_stride, U - 2, ctx->uv_stride);
00796                 memcpy(V - 2 + 1 * ctx->uv_stride, V - 2, ctx->uv_stride);
00797                 memcpy(U - 2 + 2 * ctx->uv_stride, U - 2, ctx->uv_stride);
00798                 memcpy(V - 2 + 2 * ctx->uv_stride, V - 2, ctx->uv_stride);
00799             }
00800 
00801             U += ctx->uv_stride;
00802             V += ctx->uv_stride;
00803         }
00804         dst += p->linesize[0];
00805     }
00806 
00807     return keyframe;
00808 }
00809 
00810 static const int tm2_stream_order[TM2_NUM_STREAMS] = {
00811     TM2_C_HI, TM2_C_LO, TM2_L_HI, TM2_L_LO, TM2_UPD, TM2_MOT, TM2_TYPE
00812 };
00813 
00814 static int decode_frame(AVCodecContext *avctx,
00815                         void *data, int *data_size,
00816                         AVPacket *avpkt)
00817 {
00818     const uint8_t *buf = avpkt->data;
00819     int buf_size = avpkt->size & ~3;
00820     TM2Context * const l = avctx->priv_data;
00821     AVFrame * const p= (AVFrame*)&l->pic;
00822     int i, skip, t;
00823 
00824     av_fast_padded_malloc(&l->buffer, &l->buffer_size, buf_size);
00825     if(!l->buffer){
00826         av_log(avctx, AV_LOG_ERROR, "Cannot allocate temporary buffer\n");
00827         return -1;
00828     }
00829     p->reference = 3;
00830     p->buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
00831     if(avctx->reget_buffer(avctx, p) < 0){
00832         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00833         return -1;
00834     }
00835 
00836     l->dsp.bswap_buf((uint32_t*)l->buffer, (const uint32_t*)buf, buf_size >> 2);
00837     skip = tm2_read_header(l, l->buffer);
00838 
00839     if(skip == -1){
00840         return -1;
00841     }
00842 
00843     for(i = 0; i < TM2_NUM_STREAMS; i++){
00844         if (skip >= buf_size) {
00845             return AVERROR_INVALIDDATA;
00846         }
00847         t = tm2_read_stream(l, l->buffer + skip, tm2_stream_order[i], buf_size - skip);
00848         if(t < 0){
00849             return t;
00850         }
00851         skip += t;
00852     }
00853     p->key_frame = tm2_decode_blocks(l, p);
00854     if(p->key_frame)
00855         p->pict_type = AV_PICTURE_TYPE_I;
00856     else
00857         p->pict_type = AV_PICTURE_TYPE_P;
00858 
00859     l->cur = !l->cur;
00860     *data_size = sizeof(AVFrame);
00861     *(AVFrame*)data = l->pic;
00862 
00863     return buf_size;
00864 }
00865 
00866 static av_cold int decode_init(AVCodecContext *avctx){
00867     TM2Context * const l = avctx->priv_data;
00868     int i, w = avctx->width, h = avctx->height;
00869 
00870     if((avctx->width & 3) || (avctx->height & 3)){
00871         av_log(avctx, AV_LOG_ERROR, "Width and height must be multiple of 4\n");
00872         return -1;
00873     }
00874 
00875     l->avctx = avctx;
00876     l->pic.data[0]=NULL;
00877     avctx->pix_fmt = PIX_FMT_BGR24;
00878     avcodec_get_frame_defaults(&l->pic);
00879 
00880     dsputil_init(&l->dsp, avctx);
00881 
00882     l->last  = av_malloc(4 * sizeof(*l->last)  * (w >> 2));
00883     l->clast = av_malloc(4 * sizeof(*l->clast) * (w >> 2));
00884 
00885     for(i = 0; i < TM2_NUM_STREAMS; i++) {
00886         l->tokens[i] = NULL;
00887         l->tok_lens[i] = 0;
00888     }
00889 
00890     w += 8;
00891     h += 8;
00892     l->Y1_base = av_malloc(sizeof(*l->Y1_base) * w * h);
00893     l->Y2_base = av_malloc(sizeof(*l->Y2_base) * w * h);
00894     l->y_stride = w;
00895     w = (w + 1) >> 1;
00896     h = (h + 1) >> 1;
00897     l->U1_base = av_malloc(sizeof(*l->U1_base) * w * h);
00898     l->V1_base = av_malloc(sizeof(*l->V1_base) * w * h);
00899     l->U2_base = av_malloc(sizeof(*l->U2_base) * w * h);
00900     l->V2_base = av_malloc(sizeof(*l->V1_base) * w * h);
00901     l->uv_stride = w;
00902     l->cur = 0;
00903     if (!l->Y1_base || !l->Y2_base || !l->U1_base ||
00904         !l->V1_base || !l->U2_base || !l->V2_base ||
00905         !l->last    || !l->clast) {
00906         av_freep(l->Y1_base);
00907         av_freep(l->Y2_base);
00908         av_freep(l->U1_base);
00909         av_freep(l->U2_base);
00910         av_freep(l->V1_base);
00911         av_freep(l->V2_base);
00912         av_freep(l->last);
00913         av_freep(l->clast);
00914         return AVERROR(ENOMEM);
00915     }
00916     l->Y1 = l->Y1_base + l->y_stride  * 4 + 4;
00917     l->Y2 = l->Y2_base + l->y_stride  * 4 + 4;
00918     l->U1 = l->U1_base + l->uv_stride * 2 + 2;
00919     l->U2 = l->U2_base + l->uv_stride * 2 + 2;
00920     l->V1 = l->V1_base + l->uv_stride * 2 + 2;
00921     l->V2 = l->V2_base + l->uv_stride * 2 + 2;
00922 
00923     return 0;
00924 }
00925 
00926 static av_cold int decode_end(AVCodecContext *avctx){
00927     TM2Context * const l = avctx->priv_data;
00928     AVFrame *pic = &l->pic;
00929     int i;
00930 
00931     av_free(l->last);
00932     av_free(l->clast);
00933     for(i = 0; i < TM2_NUM_STREAMS; i++)
00934         av_free(l->tokens[i]);
00935     if(l->Y1){
00936         av_free(l->Y1_base);
00937         av_free(l->U1_base);
00938         av_free(l->V1_base);
00939         av_free(l->Y2_base);
00940         av_free(l->U2_base);
00941         av_free(l->V2_base);
00942     }
00943     av_freep(&l->buffer);
00944     l->buffer_size = 0;
00945 
00946     if (pic->data[0])
00947         avctx->release_buffer(avctx, pic);
00948 
00949     return 0;
00950 }
00951 
00952 AVCodec ff_truemotion2_decoder = {
00953     .name           = "truemotion2",
00954     .type           = AVMEDIA_TYPE_VIDEO,
00955     .id             = CODEC_ID_TRUEMOTION2,
00956     .priv_data_size = sizeof(TM2Context),
00957     .init           = decode_init,
00958     .close          = decode_end,
00959     .decode         = decode_frame,
00960     .capabilities   = CODEC_CAP_DR1,
00961     .long_name = NULL_IF_CONFIG_SMALL("Duck TrueMotion 2.0"),
00962 };