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     return buf - obuf;
00227 }
00228 
00229 static int tm2_read_deltas(TM2Context *ctx, int stream_id) {
00230     int d, mb;
00231     int i, v;
00232 
00233     d = get_bits(&ctx->gb, 9);
00234     mb = get_bits(&ctx->gb, 5);
00235 
00236     if((d < 1) || (d > TM2_DELTAS) || (mb < 1) || (mb > 32)) {
00237         av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect delta table: %i deltas x %i bits\n", d, mb);
00238         return -1;
00239     }
00240 
00241     for(i = 0; i < d; i++) {
00242         v = get_bits_long(&ctx->gb, mb);
00243         if(v & (1 << (mb - 1)))
00244             ctx->deltas[stream_id][i] = v - (1 << mb);
00245         else
00246             ctx->deltas[stream_id][i] = v;
00247     }
00248     for(; i < TM2_DELTAS; i++)
00249         ctx->deltas[stream_id][i] = 0;
00250 
00251     return 0;
00252 }
00253 
00254 static int tm2_read_stream(TM2Context *ctx, const uint8_t *buf, int stream_id, int buf_size)
00255 {
00256     int i;
00257     int skip = 0;
00258     int len, toks, pos;
00259     TM2Codes codes;
00260     GetByteContext gb;
00261 
00262     if (buf_size < 4) {
00263         av_log(ctx->avctx, AV_LOG_ERROR, "not enough space for len left\n");
00264         return AVERROR_INVALIDDATA;
00265     }
00266 
00267     /* get stream length in dwords */
00268     bytestream2_init(&gb, buf, buf_size);
00269     len  = bytestream2_get_be32(&gb);
00270     skip = len * 4 + 4;
00271 
00272     if(len == 0)
00273         return 4;
00274 
00275     if (len >= INT_MAX/4-1 || len < 0 || skip > buf_size) {
00276         av_log(ctx->avctx, AV_LOG_ERROR, "Error, invalid stream size.\n");
00277         return -1;
00278     }
00279 
00280     toks = bytestream2_get_be32(&gb);
00281     if(toks & 1) {
00282         len = bytestream2_get_be32(&gb);
00283         if(len == TM2_ESCAPE) {
00284             len = bytestream2_get_be32(&gb);
00285         }
00286         if(len > 0) {
00287             pos = bytestream2_tell(&gb);
00288             if (skip <= pos)
00289                 return -1;
00290             init_get_bits(&ctx->gb, buf + pos, (skip - pos) * 8);
00291             if(tm2_read_deltas(ctx, stream_id) == -1)
00292                 return -1;
00293             bytestream2_skip(&gb, ((get_bits_count(&ctx->gb) + 31) >> 5) << 2);
00294         }
00295     }
00296     /* skip unused fields */
00297     len = bytestream2_get_be32(&gb);
00298     if(len == TM2_ESCAPE) { /* some unknown length - could be escaped too */
00299         bytestream2_skip(&gb, 8); /* unused by decoder */
00300     } else {
00301         bytestream2_skip(&gb, 4); /* unused by decoder */
00302     }
00303 
00304     pos = bytestream2_tell(&gb);
00305     if (skip <= pos)
00306         return -1;
00307     init_get_bits(&ctx->gb, buf + pos, (skip - pos) * 8);
00308     if(tm2_build_huff_table(ctx, &codes) == -1)
00309         return -1;
00310     bytestream2_skip(&gb, ((get_bits_count(&ctx->gb) + 31) >> 5) << 2);
00311 
00312     toks >>= 1;
00313     /* check if we have sane number of tokens */
00314     if((toks < 0) || (toks > 0xFFFFFF)){
00315         av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of tokens: %i\n", toks);
00316         tm2_free_codes(&codes);
00317         return -1;
00318     }
00319     ctx->tokens[stream_id] = av_realloc(ctx->tokens[stream_id], toks * sizeof(int));
00320     ctx->tok_lens[stream_id] = toks;
00321     len = bytestream2_get_be32(&gb);
00322     if(len > 0) {
00323         pos = bytestream2_tell(&gb);
00324         if (skip <= pos)
00325             return -1;
00326         init_get_bits(&ctx->gb, buf + pos, (skip - pos) * 8);
00327         for(i = 0; i < toks; i++) {
00328             if (get_bits_left(&ctx->gb) <= 0) {
00329                 av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of tokens: %i\n", toks);
00330                 return -1;
00331             }
00332             ctx->tokens[stream_id][i] = tm2_get_token(&ctx->gb, &codes);
00333             if (stream_id <= TM2_MOT && ctx->tokens[stream_id][i] >= TM2_DELTAS) {
00334                 av_log(ctx->avctx, AV_LOG_ERROR, "Invalid delta token index %d for type %d, n=%d\n",
00335                        ctx->tokens[stream_id][i], stream_id, i);
00336                 return AVERROR_INVALIDDATA;
00337             }
00338         }
00339     } else {
00340         for(i = 0; i < toks; i++) {
00341             ctx->tokens[stream_id][i] = codes.recode[0];
00342             if (stream_id <= TM2_MOT && ctx->tokens[stream_id][i] >= TM2_DELTAS) {
00343                 av_log(ctx->avctx, AV_LOG_ERROR, "Invalid delta token index %d for type %d, n=%d\n",
00344                        ctx->tokens[stream_id][i], stream_id, i);
00345                 return AVERROR_INVALIDDATA;
00346             }
00347         }
00348     }
00349     tm2_free_codes(&codes);
00350 
00351     return skip;
00352 }
00353 
00354 static inline int GET_TOK(TM2Context *ctx,int type) {
00355     if(ctx->tok_ptrs[type] >= ctx->tok_lens[type]) {
00356         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]);
00357         return 0;
00358     }
00359     if(type <= TM2_MOT) {
00360         if (ctx->tokens[type][ctx->tok_ptrs[type]] >= TM2_DELTAS) {
00361             av_log(ctx->avctx, AV_LOG_ERROR, "token %d is too large\n", ctx->tokens[type][ctx->tok_ptrs[type]]);
00362             return 0;
00363         }
00364         return ctx->deltas[type][ctx->tokens[type][ctx->tok_ptrs[type]++]];
00365     }
00366     return ctx->tokens[type][ctx->tok_ptrs[type]++];
00367 }
00368 
00369 /* blocks decoding routines */
00370 
00371 /* common Y, U, V pointers initialisation */
00372 #define TM2_INIT_POINTERS() \
00373     int *last, *clast; \
00374     int *Y, *U, *V;\
00375     int Ystride, Ustride, Vstride;\
00376 \
00377     Ystride = ctx->y_stride;\
00378     Vstride = ctx->uv_stride;\
00379     Ustride = ctx->uv_stride;\
00380     Y = (ctx->cur?ctx->Y2:ctx->Y1) + by * 4 * Ystride + bx * 4;\
00381     V = (ctx->cur?ctx->V2:ctx->V1) + by * 2 * Vstride + bx * 2;\
00382     U = (ctx->cur?ctx->U2:ctx->U1) + by * 2 * Ustride + bx * 2;\
00383     last = ctx->last + bx * 4;\
00384     clast = ctx->clast + bx * 4;
00385 
00386 #define TM2_INIT_POINTERS_2() \
00387     int *Yo, *Uo, *Vo;\
00388     int oYstride, oUstride, oVstride;\
00389 \
00390     TM2_INIT_POINTERS();\
00391     oYstride = Ystride;\
00392     oVstride = Vstride;\
00393     oUstride = Ustride;\
00394     Yo = (ctx->cur?ctx->Y1:ctx->Y2) + by * 4 * oYstride + bx * 4;\
00395     Vo = (ctx->cur?ctx->V1:ctx->V2) + by * 2 * oVstride + bx * 2;\
00396     Uo = (ctx->cur?ctx->U1:ctx->U2) + by * 2 * oUstride + bx * 2;
00397 
00398 /* recalculate last and delta values for next blocks */
00399 #define TM2_RECALC_BLOCK(CHR, stride, last, CD) {\
00400     CD[0] = CHR[1] - last[1];\
00401     CD[1] = (int)CHR[stride + 1] - (int)CHR[1];\
00402     last[0] = (int)CHR[stride + 0];\
00403     last[1] = (int)CHR[stride + 1];}
00404 
00405 /* common operations - add deltas to 4x4 block of luma or 2x2 blocks of chroma */
00406 static inline void tm2_apply_deltas(TM2Context *ctx, int* Y, int stride, int *deltas, int *last)
00407 {
00408     int ct, d;
00409     int i, j;
00410 
00411     for(j = 0; j < 4; j++){
00412         ct = ctx->D[j];
00413         for(i = 0; i < 4; i++){
00414             d = deltas[i + j * 4];
00415             ct += d;
00416             last[i] += ct;
00417             Y[i] = av_clip_uint8(last[i]);
00418         }
00419         Y += stride;
00420         ctx->D[j] = ct;
00421     }
00422 }
00423 
00424 static inline void tm2_high_chroma(int *data, int stride, int *last, int *CD, int *deltas)
00425 {
00426     int i, j;
00427     for(j = 0; j < 2; j++){
00428         for(i = 0; i < 2; i++){
00429             CD[j] += deltas[i + j * 2];
00430             last[i] += CD[j];
00431             data[i] = last[i];
00432         }
00433         data += stride;
00434     }
00435 }
00436 
00437 static inline void tm2_low_chroma(int *data, int stride, int *clast, int *CD, int *deltas, int bx)
00438 {
00439     int t;
00440     int l;
00441     int prev;
00442 
00443     if(bx > 0)
00444         prev = clast[-3];
00445     else
00446         prev = 0;
00447     t = (CD[0] + CD[1]) >> 1;
00448     l = (prev - CD[0] - CD[1] + clast[1]) >> 1;
00449     CD[1] = CD[0] + CD[1] - t;
00450     CD[0] = t;
00451     clast[0] = l;
00452 
00453     tm2_high_chroma(data, stride, clast, CD, deltas);
00454 }
00455 
00456 static inline void tm2_hi_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
00457 {
00458     int i;
00459     int deltas[16];
00460     TM2_INIT_POINTERS();
00461 
00462     /* hi-res chroma */
00463     for(i = 0; i < 4; i++) {
00464         deltas[i] = GET_TOK(ctx, TM2_C_HI);
00465         deltas[i + 4] = GET_TOK(ctx, TM2_C_HI);
00466     }
00467     tm2_high_chroma(U, Ustride, clast, ctx->CD, deltas);
00468     tm2_high_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas + 4);
00469 
00470     /* hi-res luma */
00471     for(i = 0; i < 16; i++)
00472         deltas[i] = GET_TOK(ctx, TM2_L_HI);
00473 
00474     tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
00475 }
00476 
00477 static inline void tm2_med_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
00478 {
00479     int i;
00480     int deltas[16];
00481     TM2_INIT_POINTERS();
00482 
00483     /* low-res chroma */
00484     deltas[0] = GET_TOK(ctx, TM2_C_LO);
00485     deltas[1] = deltas[2] = deltas[3] = 0;
00486     tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
00487 
00488     deltas[0] = GET_TOK(ctx, TM2_C_LO);
00489     deltas[1] = deltas[2] = deltas[3] = 0;
00490     tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
00491 
00492     /* hi-res luma */
00493     for(i = 0; i < 16; i++)
00494         deltas[i] = GET_TOK(ctx, TM2_L_HI);
00495 
00496     tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
00497 }
00498 
00499 static inline void tm2_low_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
00500 {
00501     int i;
00502     int t1, t2;
00503     int deltas[16];
00504     TM2_INIT_POINTERS();
00505 
00506     /* low-res chroma */
00507     deltas[0] = GET_TOK(ctx, TM2_C_LO);
00508     deltas[1] = deltas[2] = deltas[3] = 0;
00509     tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
00510 
00511     deltas[0] = GET_TOK(ctx, TM2_C_LO);
00512     deltas[1] = deltas[2] = deltas[3] = 0;
00513     tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
00514 
00515     /* low-res luma */
00516     for(i = 0; i < 16; i++)
00517         deltas[i] = 0;
00518 
00519     deltas[ 0] = GET_TOK(ctx, TM2_L_LO);
00520     deltas[ 2] = GET_TOK(ctx, TM2_L_LO);
00521     deltas[ 8] = GET_TOK(ctx, TM2_L_LO);
00522     deltas[10] = GET_TOK(ctx, TM2_L_LO);
00523 
00524     if(bx > 0)
00525         last[0] = (last[-1] - ctx->D[0] - ctx->D[1] - ctx->D[2] - ctx->D[3] + last[1]) >> 1;
00526     else
00527         last[0] = (last[1]  - ctx->D[0] - ctx->D[1] - ctx->D[2] - ctx->D[3])>> 1;
00528     last[2] = (last[1] + last[3]) >> 1;
00529 
00530     t1 = ctx->D[0] + ctx->D[1];
00531     ctx->D[0] = t1 >> 1;
00532     ctx->D[1] = t1 - (t1 >> 1);
00533     t2 = ctx->D[2] + ctx->D[3];
00534     ctx->D[2] = t2 >> 1;
00535     ctx->D[3] = t2 - (t2 >> 1);
00536 
00537     tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
00538 }
00539 
00540 static inline void tm2_null_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
00541 {
00542     int i;
00543     int ct;
00544     int left, right, diff;
00545     int deltas[16];
00546     TM2_INIT_POINTERS();
00547 
00548     /* null chroma */
00549     deltas[0] = deltas[1] = deltas[2] = deltas[3] = 0;
00550     tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
00551 
00552     deltas[0] = deltas[1] = deltas[2] = deltas[3] = 0;
00553     tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
00554 
00555     /* null luma */
00556     for(i = 0; i < 16; i++)
00557         deltas[i] = 0;
00558 
00559     ct = ctx->D[0] + ctx->D[1] + ctx->D[2] + ctx->D[3];
00560 
00561     if(bx > 0)
00562         left = last[-1] - ct;
00563     else
00564         left = 0;
00565 
00566     right = last[3];
00567     diff = right - left;
00568     last[0] = left + (diff >> 2);
00569     last[1] = left + (diff >> 1);
00570     last[2] = right - (diff >> 2);
00571     last[3] = right;
00572     {
00573         int tp = left;
00574 
00575         ctx->D[0] = (tp + (ct >> 2)) - left;
00576         left += ctx->D[0];
00577         ctx->D[1] = (tp + (ct >> 1)) - left;
00578         left += ctx->D[1];
00579         ctx->D[2] = ((tp + ct) - (ct >> 2)) - left;
00580         left += ctx->D[2];
00581         ctx->D[3] = (tp + ct) - left;
00582     }
00583     tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
00584 }
00585 
00586 static inline void tm2_still_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
00587 {
00588     int i, j;
00589     TM2_INIT_POINTERS_2();
00590 
00591     /* update chroma */
00592     for(j = 0; j < 2; j++){
00593         for(i = 0; i < 2; i++){
00594             U[i] = Uo[i];
00595             V[i] = Vo[i];
00596         }
00597         U += Ustride; V += Vstride;
00598         Uo += oUstride; Vo += oVstride;
00599     }
00600     U -= Ustride * 2;
00601     V -= Vstride * 2;
00602     TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
00603     TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
00604 
00605     /* update deltas */
00606     ctx->D[0] = Yo[3] - last[3];
00607     ctx->D[1] = Yo[3 + oYstride] - Yo[3];
00608     ctx->D[2] = Yo[3 + oYstride * 2] - Yo[3 + oYstride];
00609     ctx->D[3] = Yo[3 + oYstride * 3] - Yo[3 + oYstride * 2];
00610 
00611     for(j = 0; j < 4; j++){
00612         for(i = 0; i < 4; i++){
00613             Y[i] = Yo[i];
00614             last[i] = Yo[i];
00615         }
00616         Y += Ystride;
00617         Yo += oYstride;
00618     }
00619 }
00620 
00621 static inline void tm2_update_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
00622 {
00623     int i, j;
00624     int d;
00625     TM2_INIT_POINTERS_2();
00626 
00627     /* update chroma */
00628     for(j = 0; j < 2; j++){
00629         for(i = 0; i < 2; i++){
00630             U[i] = Uo[i] + GET_TOK(ctx, TM2_UPD);
00631             V[i] = Vo[i] + GET_TOK(ctx, TM2_UPD);
00632         }
00633         U += Ustride; V += Vstride;
00634         Uo += oUstride; Vo += oVstride;
00635     }
00636     U -= Ustride * 2;
00637     V -= Vstride * 2;
00638     TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
00639     TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
00640 
00641     /* update deltas */
00642     ctx->D[0] = Yo[3] - last[3];
00643     ctx->D[1] = Yo[3 + oYstride] - Yo[3];
00644     ctx->D[2] = Yo[3 + oYstride * 2] - Yo[3 + oYstride];
00645     ctx->D[3] = Yo[3 + oYstride * 3] - Yo[3 + oYstride * 2];
00646 
00647     for(j = 0; j < 4; j++){
00648         d = last[3];
00649         for(i = 0; i < 4; i++){
00650             Y[i] = Yo[i] + GET_TOK(ctx, TM2_UPD);
00651             last[i] = Y[i];
00652         }
00653         ctx->D[j] = last[3] - d;
00654         Y += Ystride;
00655         Yo += oYstride;
00656     }
00657 }
00658 
00659 static inline void tm2_motion_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
00660 {
00661     int i, j;
00662     int mx, my;
00663     TM2_INIT_POINTERS_2();
00664 
00665     mx = GET_TOK(ctx, TM2_MOT);
00666     my = GET_TOK(ctx, TM2_MOT);
00667     mx = av_clip(mx, -(bx * 4 + 4), ctx->avctx->width  - bx * 4);
00668     my = av_clip(my, -(by * 4 + 4), ctx->avctx->height - by * 4);
00669 
00670     if (4*bx+mx<0 || 4*by+my<0 || 4*bx+mx+4 > ctx->avctx->width || 4*by+my+4 > ctx->avctx->height) {
00671         av_log(0,0, "MV out of picture\n");
00672         return;
00673     }
00674 
00675     Yo += my * oYstride + mx;
00676     Uo += (my >> 1) * oUstride + (mx >> 1);
00677     Vo += (my >> 1) * oVstride + (mx >> 1);
00678 
00679     /* copy chroma */
00680     for(j = 0; j < 2; j++){
00681         for(i = 0; i < 2; i++){
00682             U[i] = Uo[i];
00683             V[i] = Vo[i];
00684         }
00685         U += Ustride; V += Vstride;
00686         Uo += oUstride; Vo += oVstride;
00687     }
00688     U -= Ustride * 2;
00689     V -= Vstride * 2;
00690     TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
00691     TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
00692 
00693     /* copy luma */
00694     for(j = 0; j < 4; j++){
00695         for(i = 0; i < 4; i++){
00696             Y[i] = Yo[i];
00697         }
00698         Y += Ystride;
00699         Yo += oYstride;
00700     }
00701     /* calculate deltas */
00702     Y -= Ystride * 4;
00703     ctx->D[0] = Y[3] - last[3];
00704     ctx->D[1] = Y[3 + Ystride] - Y[3];
00705     ctx->D[2] = Y[3 + Ystride * 2] - Y[3 + Ystride];
00706     ctx->D[3] = Y[3 + Ystride * 3] - Y[3 + Ystride * 2];
00707     for(i = 0; i < 4; i++)
00708         last[i] = Y[i + Ystride * 3];
00709 }
00710 
00711 static int tm2_decode_blocks(TM2Context *ctx, AVFrame *p)
00712 {
00713     int i, j;
00714     int w = ctx->avctx->width, h = ctx->avctx->height, bw = w >> 2, bh = h >> 2, cw = w >> 1;
00715     int type;
00716     int keyframe = 1;
00717     int *Y, *U, *V;
00718     uint8_t *dst;
00719 
00720     for(i = 0; i < TM2_NUM_STREAMS; i++)
00721         ctx->tok_ptrs[i] = 0;
00722 
00723     if (ctx->tok_lens[TM2_TYPE]<bw*bh){
00724         av_log(ctx->avctx,AV_LOG_ERROR,"Got %i tokens for %i blocks\n",ctx->tok_lens[TM2_TYPE],bw*bh);
00725         return -1;
00726     }
00727 
00728     memset(ctx->last, 0, 4 * bw * sizeof(int));
00729     memset(ctx->clast, 0, 4 * bw * sizeof(int));
00730 
00731     for(j = 0; j < bh; j++) {
00732         memset(ctx->D, 0, 4 * sizeof(int));
00733         memset(ctx->CD, 0, 4 * sizeof(int));
00734         for(i = 0; i < bw; i++) {
00735             type = GET_TOK(ctx, TM2_TYPE);
00736             switch(type) {
00737             case TM2_HI_RES:
00738                 tm2_hi_res_block(ctx, p, i, j);
00739                 break;
00740             case TM2_MED_RES:
00741                 tm2_med_res_block(ctx, p, i, j);
00742                 break;
00743             case TM2_LOW_RES:
00744                 tm2_low_res_block(ctx, p, i, j);
00745                 break;
00746             case TM2_NULL_RES:
00747                 tm2_null_res_block(ctx, p, i, j);
00748                 break;
00749             case TM2_UPDATE:
00750                 tm2_update_block(ctx, p, i, j);
00751                 keyframe = 0;
00752                 break;
00753             case TM2_STILL:
00754                 tm2_still_block(ctx, p, i, j);
00755                 keyframe = 0;
00756                 break;
00757             case TM2_MOTION:
00758                 tm2_motion_block(ctx, p, i, j);
00759                 keyframe = 0;
00760                 break;
00761             default:
00762                 av_log(ctx->avctx, AV_LOG_ERROR, "Skipping unknown block type %i\n", type);
00763             }
00764         }
00765     }
00766 
00767     /* copy data from our buffer to AVFrame */
00768     Y = (ctx->cur?ctx->Y2:ctx->Y1);
00769     U = (ctx->cur?ctx->U2:ctx->U1);
00770     V = (ctx->cur?ctx->V2:ctx->V1);
00771     dst = p->data[0];
00772     for(j = 0; j < h; j++){
00773         for(i = 0; i < w; i++){
00774             int y = Y[i], u = U[i >> 1], v = V[i >> 1];
00775             dst[3*i+0] = av_clip_uint8(y + v);
00776             dst[3*i+1] = av_clip_uint8(y);
00777             dst[3*i+2] = av_clip_uint8(y + u);
00778         }
00779 
00780         /* horizontal edge extension */
00781         Y[-4]    = Y[-3]    = Y[-2]    = Y[-1] = Y[0];
00782         Y[w + 3] = Y[w + 2] = Y[w + 1] = Y[w]  = Y[w - 1];
00783 
00784         /* vertical edge extension */
00785         if (j == 0) {
00786             memcpy(Y - 4 - 1 * ctx->y_stride, Y - 4, ctx->y_stride);
00787             memcpy(Y - 4 - 2 * ctx->y_stride, Y - 4, ctx->y_stride);
00788             memcpy(Y - 4 - 3 * ctx->y_stride, Y - 4, ctx->y_stride);
00789             memcpy(Y - 4 - 4 * ctx->y_stride, Y - 4, ctx->y_stride);
00790         } else if (j == h - 1) {
00791             memcpy(Y - 4 + 1 * ctx->y_stride, Y - 4, ctx->y_stride);
00792             memcpy(Y - 4 + 2 * ctx->y_stride, Y - 4, ctx->y_stride);
00793             memcpy(Y - 4 + 3 * ctx->y_stride, Y - 4, ctx->y_stride);
00794             memcpy(Y - 4 + 4 * ctx->y_stride, Y - 4, ctx->y_stride);
00795         }
00796 
00797         Y += ctx->y_stride;
00798         if (j & 1) {
00799             /* horizontal edge extension */
00800             U[-2]     = U[-1] = U[0];
00801             V[-2]     = V[-1] = V[0];
00802             U[cw + 1] = U[cw] = U[cw - 1];
00803             V[cw + 1] = V[cw] = V[cw - 1];
00804 
00805             /* vertical edge extension */
00806             if (j == 1) {
00807                 memcpy(U - 2 - 1 * ctx->uv_stride, U - 2, ctx->uv_stride);
00808                 memcpy(V - 2 - 1 * ctx->uv_stride, V - 2, ctx->uv_stride);
00809                 memcpy(U - 2 - 2 * ctx->uv_stride, U - 2, ctx->uv_stride);
00810                 memcpy(V - 2 - 2 * ctx->uv_stride, V - 2, ctx->uv_stride);
00811             } else if (j == h - 1) {
00812                 memcpy(U - 2 + 1 * ctx->uv_stride, U - 2, ctx->uv_stride);
00813                 memcpy(V - 2 + 1 * ctx->uv_stride, V - 2, ctx->uv_stride);
00814                 memcpy(U - 2 + 2 * ctx->uv_stride, U - 2, ctx->uv_stride);
00815                 memcpy(V - 2 + 2 * ctx->uv_stride, V - 2, ctx->uv_stride);
00816             }
00817 
00818             U += ctx->uv_stride;
00819             V += ctx->uv_stride;
00820         }
00821         dst += p->linesize[0];
00822     }
00823 
00824     return keyframe;
00825 }
00826 
00827 static const int tm2_stream_order[TM2_NUM_STREAMS] = {
00828     TM2_C_HI, TM2_C_LO, TM2_L_HI, TM2_L_LO, TM2_UPD, TM2_MOT, TM2_TYPE
00829 };
00830 
00831 static int decode_frame(AVCodecContext *avctx,
00832                         void *data, int *data_size,
00833                         AVPacket *avpkt)
00834 {
00835     const uint8_t *buf = avpkt->data;
00836     int buf_size = avpkt->size & ~3;
00837     TM2Context * const l = avctx->priv_data;
00838     AVFrame * const p = &l->pic;
00839     int i, skip, t;
00840 
00841     av_fast_padded_malloc(&l->buffer, &l->buffer_size, buf_size);
00842     if(!l->buffer){
00843         av_log(avctx, AV_LOG_ERROR, "Cannot allocate temporary buffer\n");
00844         return -1;
00845     }
00846     p->reference = 3;
00847     p->buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
00848     if(avctx->reget_buffer(avctx, p) < 0){
00849         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00850         return -1;
00851     }
00852 
00853     l->dsp.bswap_buf((uint32_t*)l->buffer, (const uint32_t*)buf, buf_size >> 2);
00854     skip = tm2_read_header(l, l->buffer);
00855 
00856     if(skip == -1){
00857         return -1;
00858     }
00859 
00860     for(i = 0; i < TM2_NUM_STREAMS; i++){
00861         if (skip >= buf_size) {
00862             av_log(avctx, AV_LOG_ERROR, "no space for tm2_read_stream\n");
00863             return AVERROR_INVALIDDATA;
00864         }
00865 
00866         t = tm2_read_stream(l, l->buffer + skip, tm2_stream_order[i], buf_size - skip);
00867         if(t < 0){
00868             return t;
00869         }
00870         skip += t;
00871     }
00872     p->key_frame = tm2_decode_blocks(l, p);
00873     if(p->key_frame)
00874         p->pict_type = AV_PICTURE_TYPE_I;
00875     else
00876         p->pict_type = AV_PICTURE_TYPE_P;
00877 
00878     l->cur = !l->cur;
00879     *data_size = sizeof(AVFrame);
00880     *(AVFrame*)data = l->pic;
00881 
00882     return buf_size;
00883 }
00884 
00885 static av_cold int decode_init(AVCodecContext *avctx){
00886     TM2Context * const l = avctx->priv_data;
00887     int i, w = avctx->width, h = avctx->height;
00888 
00889     if((avctx->width & 3) || (avctx->height & 3)){
00890         av_log(avctx, AV_LOG_ERROR, "Width and height must be multiple of 4\n");
00891         return -1;
00892     }
00893 
00894     l->avctx = avctx;
00895     l->pic.data[0]=NULL;
00896     avctx->pix_fmt = PIX_FMT_BGR24;
00897     avcodec_get_frame_defaults(&l->pic);
00898 
00899     ff_dsputil_init(&l->dsp, avctx);
00900 
00901     l->last  = av_malloc(4 * sizeof(*l->last)  * (w >> 2));
00902     l->clast = av_malloc(4 * sizeof(*l->clast) * (w >> 2));
00903 
00904     for(i = 0; i < TM2_NUM_STREAMS; i++) {
00905         l->tokens[i] = NULL;
00906         l->tok_lens[i] = 0;
00907     }
00908 
00909     w += 8;
00910     h += 8;
00911     l->Y1_base = av_malloc(sizeof(*l->Y1_base) * w * h);
00912     l->Y2_base = av_malloc(sizeof(*l->Y2_base) * w * h);
00913     l->y_stride = w;
00914     w = (w + 1) >> 1;
00915     h = (h + 1) >> 1;
00916     l->U1_base = av_malloc(sizeof(*l->U1_base) * w * h);
00917     l->V1_base = av_malloc(sizeof(*l->V1_base) * w * h);
00918     l->U2_base = av_malloc(sizeof(*l->U2_base) * w * h);
00919     l->V2_base = av_malloc(sizeof(*l->V1_base) * w * h);
00920     l->uv_stride = w;
00921     l->cur = 0;
00922     if (!l->Y1_base || !l->Y2_base || !l->U1_base ||
00923         !l->V1_base || !l->U2_base || !l->V2_base ||
00924         !l->last    || !l->clast) {
00925         av_freep(l->Y1_base);
00926         av_freep(l->Y2_base);
00927         av_freep(l->U1_base);
00928         av_freep(l->U2_base);
00929         av_freep(l->V1_base);
00930         av_freep(l->V2_base);
00931         av_freep(l->last);
00932         av_freep(l->clast);
00933         return AVERROR(ENOMEM);
00934     }
00935     l->Y1 = l->Y1_base + l->y_stride  * 4 + 4;
00936     l->Y2 = l->Y2_base + l->y_stride  * 4 + 4;
00937     l->U1 = l->U1_base + l->uv_stride * 2 + 2;
00938     l->U2 = l->U2_base + l->uv_stride * 2 + 2;
00939     l->V1 = l->V1_base + l->uv_stride * 2 + 2;
00940     l->V2 = l->V2_base + l->uv_stride * 2 + 2;
00941 
00942     return 0;
00943 }
00944 
00945 static av_cold int decode_end(AVCodecContext *avctx){
00946     TM2Context * const l = avctx->priv_data;
00947     AVFrame *pic = &l->pic;
00948     int i;
00949 
00950     av_free(l->last);
00951     av_free(l->clast);
00952     for(i = 0; i < TM2_NUM_STREAMS; i++)
00953         av_free(l->tokens[i]);
00954     if(l->Y1){
00955         av_free(l->Y1_base);
00956         av_free(l->U1_base);
00957         av_free(l->V1_base);
00958         av_free(l->Y2_base);
00959         av_free(l->U2_base);
00960         av_free(l->V2_base);
00961     }
00962     av_freep(&l->buffer);
00963     l->buffer_size = 0;
00964 
00965     if (pic->data[0])
00966         avctx->release_buffer(avctx, pic);
00967 
00968     return 0;
00969 }
00970 
00971 AVCodec ff_truemotion2_decoder = {
00972     .name           = "truemotion2",
00973     .type           = AVMEDIA_TYPE_VIDEO,
00974     .id             = CODEC_ID_TRUEMOTION2,
00975     .priv_data_size = sizeof(TM2Context),
00976     .init           = decode_init,
00977     .close          = decode_end,
00978     .decode         = decode_frame,
00979     .capabilities   = CODEC_CAP_DR1,
00980     .long_name      = NULL_IF_CONFIG_SMALL("Duck TrueMotion 2.0"),
00981 };