FFmpeg: libavcodec/truemotion1.c Source File

00001 /*
00002  * Duck TrueMotion 1.0 Decoder
00003  * Copyright (C) 2003 Alex Beregszaszi & Mike Melanson
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 
00032 #include <stdio.h>
00033 #include <stdlib.h>
00034 #include <string.h>
00035 
00036 #include "avcodec.h"
00037 #include "dsputil.h"
00038 #include "libavutil/imgutils.h"
00039 
00040 #include "truemotion1data.h"
00041 
00042 typedef struct TrueMotion1Context {
00043     AVCodecContext *avctx;
00044     AVFrame frame;
00045 
00046     const uint8_t *buf;
00047     int size;
00048 
00049     const uint8_t *mb_change_bits;
00050     int mb_change_bits_row_size;
00051     const uint8_t *index_stream;
00052     int index_stream_size;
00053 
00054     int flags;
00055     int x, y, w, h;
00056 
00057     uint32_t y_predictor_table[1024];
00058     uint32_t c_predictor_table[1024];
00059     uint32_t fat_y_predictor_table[1024];
00060     uint32_t fat_c_predictor_table[1024];
00061 
00062     int compression;
00063     int block_type;
00064     int block_width;
00065     int block_height;
00066 
00067     int16_t ydt[8];
00068     int16_t cdt[8];
00069     int16_t fat_ydt[8];
00070     int16_t fat_cdt[8];
00071 
00072     int last_deltaset, last_vectable;
00073 
00074     unsigned int *vert_pred;
00075     int vert_pred_size;
00076 
00077 } TrueMotion1Context;
00078 
00079 #define FLAG_SPRITE         32
00080 #define FLAG_KEYFRAME       16
00081 #define FLAG_INTERFRAME      8
00082 #define FLAG_INTERPOLATED    4
00083 
00084 struct frame_header {
00085     uint8_t header_size;
00086     uint8_t compression;
00087     uint8_t deltaset;
00088     uint8_t vectable;
00089     uint16_t ysize;
00090     uint16_t xsize;
00091     uint16_t checksum;
00092     uint8_t version;
00093     uint8_t header_type;
00094     uint8_t flags;
00095     uint8_t control;
00096     uint16_t xoffset;
00097     uint16_t yoffset;
00098     uint16_t width;
00099     uint16_t height;
00100 };
00101 
00102 #define ALGO_NOP        0
00103 #define ALGO_RGB16V     1
00104 #define ALGO_RGB16H     2
00105 #define ALGO_RGB24H     3
00106 
00107 /* these are the various block sizes that can occupy a 4x4 block */
00108 #define BLOCK_2x2  0
00109 #define BLOCK_2x4  1
00110 #define BLOCK_4x2  2
00111 #define BLOCK_4x4  3
00112 
00113 typedef struct comp_types {
00114     int algorithm;
00115     int block_width; // vres
00116     int block_height; // hres
00117     int block_type;
00118 } comp_types;
00119 
00120 /* { valid for metatype }, algorithm, num of deltas, vert res, horiz res */
00121 static const comp_types compression_types[17] = {
00122     { ALGO_NOP,    0, 0, 0 },
00123 
00124     { ALGO_RGB16V, 4, 4, BLOCK_4x4 },
00125     { ALGO_RGB16H, 4, 4, BLOCK_4x4 },
00126     { ALGO_RGB16V, 4, 2, BLOCK_4x2 },
00127     { ALGO_RGB16H, 4, 2, BLOCK_4x2 },
00128 
00129     { ALGO_RGB16V, 2, 4, BLOCK_2x4 },
00130     { ALGO_RGB16H, 2, 4, BLOCK_2x4 },
00131     { ALGO_RGB16V, 2, 2, BLOCK_2x2 },
00132     { ALGO_RGB16H, 2, 2, BLOCK_2x2 },
00133 
00134     { ALGO_NOP,    4, 4, BLOCK_4x4 },
00135     { ALGO_RGB24H, 4, 4, BLOCK_4x4 },
00136     { ALGO_NOP,    4, 2, BLOCK_4x2 },
00137     { ALGO_RGB24H, 4, 2, BLOCK_4x2 },
00138 
00139     { ALGO_NOP,    2, 4, BLOCK_2x4 },
00140     { ALGO_RGB24H, 2, 4, BLOCK_2x4 },
00141     { ALGO_NOP,    2, 2, BLOCK_2x2 },
00142     { ALGO_RGB24H, 2, 2, BLOCK_2x2 }
00143 };
00144 
00145 static void select_delta_tables(TrueMotion1Context *s, int delta_table_index)
00146 {
00147     int i;
00148 
00149     if (delta_table_index > 3)
00150         return;
00151 
00152     memcpy(s->ydt, ydts[delta_table_index], 8 * sizeof(int16_t));
00153     memcpy(s->cdt, cdts[delta_table_index], 8 * sizeof(int16_t));
00154     memcpy(s->fat_ydt, fat_ydts[delta_table_index], 8 * sizeof(int16_t));
00155     memcpy(s->fat_cdt, fat_cdts[delta_table_index], 8 * sizeof(int16_t));
00156 
00157     /* Y skinny deltas need to be halved for some reason; maybe the
00158      * skinny Y deltas should be modified */
00159     for (i = 0; i < 8; i++)
00160     {
00161         /* drop the lsb before dividing by 2-- net effect: round down
00162          * when dividing a negative number (e.g., -3/2 = -2, not -1) */
00163         s->ydt[i] &= 0xFFFE;
00164         s->ydt[i] /= 2;
00165     }
00166 }
00167 
00168 #if HAVE_BIGENDIAN
00169 static int make_ydt15_entry(int p2, int p1, int16_t *ydt)
00170 #else
00171 static int make_ydt15_entry(int p1, int p2, int16_t *ydt)
00172 #endif
00173 {
00174     int lo, hi;
00175 
00176     lo = ydt[p1];
00177     lo += (lo << 5) + (lo << 10);
00178     hi = ydt[p2];
00179     hi += (hi << 5) + (hi << 10);
00180     return (lo + (hi << 16)) << 1;
00181 }
00182 
00183 static int make_cdt15_entry(int p1, int p2, int16_t *cdt)
00184 {
00185     int r, b, lo;
00186 
00187     b = cdt[p2];
00188     r = cdt[p1] << 10;
00189     lo = b + r;
00190     return (lo + (lo << 16)) << 1;
00191 }
00192 
00193 #if HAVE_BIGENDIAN
00194 static int make_ydt16_entry(int p2, int p1, int16_t *ydt)
00195 #else
00196 static int make_ydt16_entry(int p1, int p2, int16_t *ydt)
00197 #endif
00198 {
00199     int lo, hi;
00200 
00201     lo = ydt[p1];
00202     lo += (lo << 6) + (lo << 11);
00203     hi = ydt[p2];
00204     hi += (hi << 6) + (hi << 11);
00205     return (lo + (hi << 16)) << 1;
00206 }
00207 
00208 static int make_cdt16_entry(int p1, int p2, int16_t *cdt)
00209 {
00210     int r, b, lo;
00211 
00212     b = cdt[p2];
00213     r = cdt[p1] << 11;
00214     lo = b + r;
00215     return (lo + (lo << 16)) << 1;
00216 }
00217 
00218 static int make_ydt24_entry(int p1, int p2, int16_t *ydt)
00219 {
00220     int lo, hi;
00221 
00222     lo = ydt[p1];
00223     hi = ydt[p2];
00224     return (lo + (hi << 8) + (hi << 16)) << 1;
00225 }
00226 
00227 static int make_cdt24_entry(int p1, int p2, int16_t *cdt)
00228 {
00229     int r, b;
00230 
00231     b = cdt[p2];
00232     r = cdt[p1]<<16;
00233     return (b+r) << 1;
00234 }
00235 
00236 static void gen_vector_table15(TrueMotion1Context *s, const uint8_t *sel_vector_table)
00237 {
00238     int len, i, j;
00239     unsigned char delta_pair;
00240 
00241     for (i = 0; i < 1024; i += 4)
00242     {
00243         len = *sel_vector_table++ / 2;
00244         for (j = 0; j < len; j++)
00245         {
00246             delta_pair = *sel_vector_table++;
00247             s->y_predictor_table[i+j] = 0xfffffffe &
00248                 make_ydt15_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
00249             s->c_predictor_table[i+j] = 0xfffffffe &
00250                 make_cdt15_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
00251         }
00252         s->y_predictor_table[i+(j-1)] |= 1;
00253         s->c_predictor_table[i+(j-1)] |= 1;
00254     }
00255 }
00256 
00257 static void gen_vector_table16(TrueMotion1Context *s, const uint8_t *sel_vector_table)
00258 {
00259     int len, i, j;
00260     unsigned char delta_pair;
00261 
00262     for (i = 0; i < 1024; i += 4)
00263     {
00264         len = *sel_vector_table++ / 2;
00265         for (j = 0; j < len; j++)
00266         {
00267             delta_pair = *sel_vector_table++;
00268             s->y_predictor_table[i+j] = 0xfffffffe &
00269                 make_ydt16_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
00270             s->c_predictor_table[i+j] = 0xfffffffe &
00271                 make_cdt16_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
00272         }
00273         s->y_predictor_table[i+(j-1)] |= 1;
00274         s->c_predictor_table[i+(j-1)] |= 1;
00275     }
00276 }
00277 
00278 static void gen_vector_table24(TrueMotion1Context *s, const uint8_t *sel_vector_table)
00279 {
00280     int len, i, j;
00281     unsigned char delta_pair;
00282 
00283     for (i = 0; i < 1024; i += 4)
00284     {
00285         len = *sel_vector_table++ / 2;
00286         for (j = 0; j < len; j++)
00287         {
00288             delta_pair = *sel_vector_table++;
00289             s->y_predictor_table[i+j] = 0xfffffffe &
00290                 make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
00291             s->c_predictor_table[i+j] = 0xfffffffe &
00292                 make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
00293             s->fat_y_predictor_table[i+j] = 0xfffffffe &
00294                 make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_ydt);
00295             s->fat_c_predictor_table[i+j] = 0xfffffffe &
00296                 make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_cdt);
00297         }
00298         s->y_predictor_table[i+(j-1)] |= 1;
00299         s->c_predictor_table[i+(j-1)] |= 1;
00300         s->fat_y_predictor_table[i+(j-1)] |= 1;
00301         s->fat_c_predictor_table[i+(j-1)] |= 1;
00302     }
00303 }
00304 
00305 /* Returns the number of bytes consumed from the bytestream. Returns -1 if
00306  * there was an error while decoding the header */
00307 static int truemotion1_decode_header(TrueMotion1Context *s)
00308 {
00309     int i;
00310     int width_shift = 0;
00311     int new_pix_fmt;
00312     struct frame_header header;
00313     uint8_t header_buffer[128] = { 0 };  /* logical maximum size of the header */
00314     const uint8_t *sel_vector_table;
00315 
00316     header.header_size = ((s->buf[0] >> 5) | (s->buf[0] << 3)) & 0x7f;
00317     if (s->buf[0] < 0x10 || header.header_size >= s->size)
00318     {
00319         av_log(s->avctx, AV_LOG_ERROR, "invalid header size (%d)\n", s->buf[0]);
00320         return -1;
00321     }
00322 
00323     /* unscramble the header bytes with a XOR operation */
00324     for (i = 1; i < header.header_size; i++)
00325         header_buffer[i - 1] = s->buf[i] ^ s->buf[i + 1];
00326 
00327     header.compression = header_buffer[0];
00328     header.deltaset = header_buffer[1];
00329     header.vectable = header_buffer[2];
00330     header.ysize = AV_RL16(&header_buffer[3]);
00331     header.xsize = AV_RL16(&header_buffer[5]);
00332     header.checksum = AV_RL16(&header_buffer[7]);
00333     header.version = header_buffer[9];
00334     header.header_type = header_buffer[10];
00335     header.flags = header_buffer[11];
00336     header.control = header_buffer[12];
00337 
00338     /* Version 2 */
00339     if (header.version >= 2)
00340     {
00341         if (header.header_type > 3)
00342         {
00343             av_log(s->avctx, AV_LOG_ERROR, "invalid header type (%d)\n", header.header_type);
00344             return -1;
00345         } else if ((header.header_type == 2) || (header.header_type == 3)) {
00346             s->flags = header.flags;
00347             if (!(s->flags & FLAG_INTERFRAME))
00348                 s->flags |= FLAG_KEYFRAME;
00349         } else
00350             s->flags = FLAG_KEYFRAME;
00351     } else /* Version 1 */
00352         s->flags = FLAG_KEYFRAME;
00353 
00354     if (s->flags & FLAG_SPRITE) {
00355         av_log_ask_for_sample(s->avctx, "SPRITE frame found.\n");
00356         /* FIXME header.width, height, xoffset and yoffset aren't initialized */
00357         return -1;
00358     } else {
00359         s->w = header.xsize;
00360         s->h = header.ysize;
00361         if (header.header_type < 2) {
00362             if ((s->w < 213) && (s->h >= 176))
00363             {
00364                 s->flags |= FLAG_INTERPOLATED;
00365                 av_log_ask_for_sample(s->avctx, "INTERPOLATION selected.\n");
00366             }
00367         }
00368     }
00369 
00370     if (header.compression >= 17) {
00371         av_log(s->avctx, AV_LOG_ERROR, "invalid compression type (%d)\n", header.compression);
00372         return -1;
00373     }
00374 
00375     if ((header.deltaset != s->last_deltaset) ||
00376         (header.vectable != s->last_vectable))
00377         select_delta_tables(s, header.deltaset);
00378 
00379     if ((header.compression & 1) && header.header_type)
00380         sel_vector_table = pc_tbl2;
00381     else {
00382         if (header.vectable > 0 && header.vectable < 4)
00383             sel_vector_table = tables[header.vectable - 1];
00384         else {
00385             av_log(s->avctx, AV_LOG_ERROR, "invalid vector table id (%d)\n", header.vectable);
00386             return -1;
00387         }
00388     }
00389 
00390     if (compression_types[header.compression].algorithm == ALGO_RGB24H) {
00391         new_pix_fmt = PIX_FMT_RGB32;
00392         width_shift = 1;
00393     } else
00394         new_pix_fmt = PIX_FMT_RGB555; // RGB565 is supported as well
00395 
00396     s->w >>= width_shift;
00397     if (av_image_check_size(s->w, s->h, 0, s->avctx) < 0)
00398         return -1;
00399 
00400     if (s->w != s->avctx->width || s->h != s->avctx->height ||
00401         new_pix_fmt != s->avctx->pix_fmt) {
00402         if (s->frame.data[0])
00403             s->avctx->release_buffer(s->avctx, &s->frame);
00404         s->avctx->sample_aspect_ratio = (AVRational){ 1 << width_shift, 1 };
00405         s->avctx->pix_fmt = new_pix_fmt;
00406         avcodec_set_dimensions(s->avctx, s->w, s->h);
00407         av_fast_malloc(&s->vert_pred, &s->vert_pred_size, s->avctx->width * sizeof(unsigned int));
00408     }
00409 
00410     /* There is 1 change bit per 4 pixels, so each change byte represents
00411      * 32 pixels; divide width by 4 to obtain the number of change bits and
00412      * then round up to the nearest byte. */
00413     s->mb_change_bits_row_size = ((s->avctx->width >> (2 - width_shift)) + 7) >> 3;
00414 
00415     if ((header.deltaset != s->last_deltaset) || (header.vectable != s->last_vectable))
00416     {
00417         if (compression_types[header.compression].algorithm == ALGO_RGB24H)
00418             gen_vector_table24(s, sel_vector_table);
00419         else
00420         if (s->avctx->pix_fmt == PIX_FMT_RGB555)
00421             gen_vector_table15(s, sel_vector_table);
00422         else
00423             gen_vector_table16(s, sel_vector_table);
00424     }
00425 
00426     /* set up pointers to the other key data chunks */
00427     s->mb_change_bits = s->buf + header.header_size;
00428     if (s->flags & FLAG_KEYFRAME) {
00429         /* no change bits specified for a keyframe; only index bytes */
00430         s->index_stream = s->mb_change_bits;
00431     } else {
00432         /* one change bit per 4x4 block */
00433         s->index_stream = s->mb_change_bits +
00434             (s->mb_change_bits_row_size * (s->avctx->height >> 2));
00435     }
00436     s->index_stream_size = s->size - (s->index_stream - s->buf);
00437 
00438     s->last_deltaset = header.deltaset;
00439     s->last_vectable = header.vectable;
00440     s->compression = header.compression;
00441     s->block_width = compression_types[header.compression].block_width;
00442     s->block_height = compression_types[header.compression].block_height;
00443     s->block_type = compression_types[header.compression].block_type;
00444 
00445     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
00446         av_log(s->avctx, AV_LOG_INFO, "tables: %d / %d c:%d %dx%d t:%d %s%s%s%s\n",
00447             s->last_deltaset, s->last_vectable, s->compression, s->block_width,
00448             s->block_height, s->block_type,
00449             s->flags & FLAG_KEYFRAME ? " KEY" : "",
00450             s->flags & FLAG_INTERFRAME ? " INTER" : "",
00451             s->flags & FLAG_SPRITE ? " SPRITE" : "",
00452             s->flags & FLAG_INTERPOLATED ? " INTERPOL" : "");
00453 
00454     return header.header_size;
00455 }
00456 
00457 static av_cold int truemotion1_decode_init(AVCodecContext *avctx)
00458 {
00459     TrueMotion1Context *s = avctx->priv_data;
00460 
00461     s->avctx = avctx;
00462 
00463     // FIXME: it may change ?
00464 //    if (avctx->bits_per_sample == 24)
00465 //        avctx->pix_fmt = PIX_FMT_RGB24;
00466 //    else
00467 //        avctx->pix_fmt = PIX_FMT_RGB555;
00468 
00469     avcodec_get_frame_defaults(&s->frame);
00470     s->frame.data[0] = NULL;
00471 
00472     /* there is a vertical predictor for each pixel in a line; each vertical
00473      * predictor is 0 to start with */
00474     av_fast_malloc(&s->vert_pred, &s->vert_pred_size, s->avctx->width * sizeof(unsigned int));
00475 
00476     return 0;
00477 }
00478 
00479 /*
00480 Block decoding order:
00481 
00482 dxi: Y-Y
00483 dxic: Y-C-Y
00484 dxic2: Y-C-Y-C
00485 
00486 hres,vres,i,i%vres (0 < i < 4)
00487 2x2 0: 0 dxic2
00488 2x2 1: 1 dxi
00489 2x2 2: 0 dxic2
00490 2x2 3: 1 dxi
00491 2x4 0: 0 dxic2
00492 2x4 1: 1 dxi
00493 2x4 2: 2 dxi
00494 2x4 3: 3 dxi
00495 4x2 0: 0 dxic
00496 4x2 1: 1 dxi
00497 4x2 2: 0 dxic
00498 4x2 3: 1 dxi
00499 4x4 0: 0 dxic
00500 4x4 1: 1 dxi
00501 4x4 2: 2 dxi
00502 4x4 3: 3 dxi
00503 */
00504 
00505 #define GET_NEXT_INDEX() \
00506 {\
00507     if (index_stream_index >= s->index_stream_size) { \
00508         av_log(s->avctx, AV_LOG_INFO, " help! truemotion1 decoder went out of bounds\n"); \
00509         return; \
00510     } \
00511     index = s->index_stream[index_stream_index++] * 4; \
00512 }
00513 
00514 #define APPLY_C_PREDICTOR() \
00515     if(index > 1023){\
00516         av_log(s->avctx, AV_LOG_ERROR, " index %d went out of bounds\n", index); \
00517         return; \
00518     }\
00519     predictor_pair = s->c_predictor_table[index]; \
00520     horiz_pred += (predictor_pair >> 1); \
00521     if (predictor_pair & 1) { \
00522         GET_NEXT_INDEX() \
00523         if (!index) { \
00524             GET_NEXT_INDEX() \
00525             predictor_pair = s->c_predictor_table[index]; \
00526             horiz_pred += ((predictor_pair >> 1) * 5); \
00527             if (predictor_pair & 1) \
00528                 GET_NEXT_INDEX() \
00529             else \
00530                 index++; \
00531         } \
00532     } else \
00533         index++;
00534 
00535 #define APPLY_C_PREDICTOR_24() \
00536     if(index > 1023){\
00537         av_log(s->avctx, AV_LOG_ERROR, " index %d went out of bounds\n", index); \
00538         return; \
00539     }\
00540     predictor_pair = s->c_predictor_table[index]; \
00541     horiz_pred += (predictor_pair >> 1); \
00542     if (predictor_pair & 1) { \
00543         GET_NEXT_INDEX() \
00544         if (!index) { \
00545             GET_NEXT_INDEX() \
00546             predictor_pair = s->fat_c_predictor_table[index]; \
00547             horiz_pred += (predictor_pair >> 1); \
00548             if (predictor_pair & 1) \
00549                 GET_NEXT_INDEX() \
00550             else \
00551                 index++; \
00552         } \
00553     } else \
00554         index++;
00555 
00556 
00557 #define APPLY_Y_PREDICTOR() \
00558     if(index > 1023){\
00559         av_log(s->avctx, AV_LOG_ERROR, " index %d went out of bounds\n", index); \
00560         return; \
00561     }\
00562     predictor_pair = s->y_predictor_table[index]; \
00563     horiz_pred += (predictor_pair >> 1); \
00564     if (predictor_pair & 1) { \
00565         GET_NEXT_INDEX() \
00566         if (!index) { \
00567             GET_NEXT_INDEX() \
00568             predictor_pair = s->y_predictor_table[index]; \
00569             horiz_pred += ((predictor_pair >> 1) * 5); \
00570             if (predictor_pair & 1) \
00571                 GET_NEXT_INDEX() \
00572             else \
00573                 index++; \
00574         } \
00575     } else \
00576         index++;
00577 
00578 #define APPLY_Y_PREDICTOR_24() \
00579     if(index > 1023){\
00580         av_log(s->avctx, AV_LOG_ERROR, " index %d went out of bounds\n", index); \
00581         return; \
00582     }\
00583     predictor_pair = s->y_predictor_table[index]; \
00584     horiz_pred += (predictor_pair >> 1); \
00585     if (predictor_pair & 1) { \
00586         GET_NEXT_INDEX() \
00587         if (!index) { \
00588             GET_NEXT_INDEX() \
00589             predictor_pair = s->fat_y_predictor_table[index]; \
00590             horiz_pred += (predictor_pair >> 1); \
00591             if (predictor_pair & 1) \
00592                 GET_NEXT_INDEX() \
00593             else \
00594                 index++; \
00595         } \
00596     } else \
00597         index++;
00598 
00599 #define OUTPUT_PIXEL_PAIR() \
00600     *current_pixel_pair = *vert_pred + horiz_pred; \
00601     *vert_pred++ = *current_pixel_pair++;
00602 
00603 static void truemotion1_decode_16bit(TrueMotion1Context *s)
00604 {
00605     int y;
00606     int pixels_left;  /* remaining pixels on this line */
00607     unsigned int predictor_pair;
00608     unsigned int horiz_pred;
00609     unsigned int *vert_pred;
00610     unsigned int *current_pixel_pair;
00611     unsigned char *current_line = s->frame.data[0];
00612     int keyframe = s->flags & FLAG_KEYFRAME;
00613 
00614     /* these variables are for managing the stream of macroblock change bits */
00615     const unsigned char *mb_change_bits = s->mb_change_bits;
00616     unsigned char mb_change_byte;
00617     unsigned char mb_change_byte_mask;
00618     int mb_change_index;
00619 
00620     /* these variables are for managing the main index stream */
00621     int index_stream_index = 0;  /* yes, the index into the index stream */
00622     int index;
00623 
00624     /* clean out the line buffer */
00625     memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
00626 
00627     GET_NEXT_INDEX();
00628 
00629     for (y = 0; y < s->avctx->height; y++) {
00630 
00631         /* re-init variables for the next line iteration */
00632         horiz_pred = 0;
00633         current_pixel_pair = (unsigned int *)current_line;
00634         vert_pred = s->vert_pred;
00635         mb_change_index = 0;
00636         mb_change_byte = mb_change_bits[mb_change_index++];
00637         mb_change_byte_mask = 0x01;
00638         pixels_left = s->avctx->width;
00639 
00640         while (pixels_left > 0) {
00641 
00642             if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
00643 
00644                 switch (y & 3) {
00645                 case 0:
00646                     /* if macroblock width is 2, apply C-Y-C-Y; else
00647                      * apply C-Y-Y */
00648                     if (s->block_width == 2) {
00649                         APPLY_C_PREDICTOR();
00650                         APPLY_Y_PREDICTOR();
00651                         OUTPUT_PIXEL_PAIR();
00652                         APPLY_C_PREDICTOR();
00653                         APPLY_Y_PREDICTOR();
00654                         OUTPUT_PIXEL_PAIR();
00655                     } else {
00656                         APPLY_C_PREDICTOR();
00657                         APPLY_Y_PREDICTOR();
00658                         OUTPUT_PIXEL_PAIR();
00659                         APPLY_Y_PREDICTOR();
00660                         OUTPUT_PIXEL_PAIR();
00661                     }
00662                     break;
00663 
00664                 case 1:
00665                 case 3:
00666                     /* always apply 2 Y predictors on these iterations */
00667                     APPLY_Y_PREDICTOR();
00668                     OUTPUT_PIXEL_PAIR();
00669                     APPLY_Y_PREDICTOR();
00670                     OUTPUT_PIXEL_PAIR();
00671                     break;
00672 
00673                 case 2:
00674                     /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
00675                      * depending on the macroblock type */
00676                     if (s->block_type == BLOCK_2x2) {
00677                         APPLY_C_PREDICTOR();
00678                         APPLY_Y_PREDICTOR();
00679                         OUTPUT_PIXEL_PAIR();
00680                         APPLY_C_PREDICTOR();
00681                         APPLY_Y_PREDICTOR();
00682                         OUTPUT_PIXEL_PAIR();
00683                     } else if (s->block_type == BLOCK_4x2) {
00684                         APPLY_C_PREDICTOR();
00685                         APPLY_Y_PREDICTOR();
00686                         OUTPUT_PIXEL_PAIR();
00687                         APPLY_Y_PREDICTOR();
00688                         OUTPUT_PIXEL_PAIR();
00689                     } else {
00690                         APPLY_Y_PREDICTOR();
00691                         OUTPUT_PIXEL_PAIR();
00692                         APPLY_Y_PREDICTOR();
00693                         OUTPUT_PIXEL_PAIR();
00694                     }
00695                     break;
00696                 }
00697 
00698             } else {
00699 
00700                 /* skip (copy) four pixels, but reassign the horizontal
00701                  * predictor */
00702                 *vert_pred++ = *current_pixel_pair++;
00703                 horiz_pred = *current_pixel_pair - *vert_pred;
00704                 *vert_pred++ = *current_pixel_pair++;
00705 
00706             }
00707 
00708             if (!keyframe) {
00709                 mb_change_byte_mask <<= 1;
00710 
00711                 /* next byte */
00712                 if (!mb_change_byte_mask) {
00713                     mb_change_byte = mb_change_bits[mb_change_index++];
00714                     mb_change_byte_mask = 0x01;
00715                 }
00716             }
00717 
00718             pixels_left -= 4;
00719         }
00720 
00721         /* next change row */
00722         if (((y + 1) & 3) == 0)
00723             mb_change_bits += s->mb_change_bits_row_size;
00724 
00725         current_line += s->frame.linesize[0];
00726     }
00727 }
00728 
00729 static void truemotion1_decode_24bit(TrueMotion1Context *s)
00730 {
00731     int y;
00732     int pixels_left;  /* remaining pixels on this line */
00733     unsigned int predictor_pair;
00734     unsigned int horiz_pred;
00735     unsigned int *vert_pred;
00736     unsigned int *current_pixel_pair;
00737     unsigned char *current_line = s->frame.data[0];
00738     int keyframe = s->flags & FLAG_KEYFRAME;
00739 
00740     /* these variables are for managing the stream of macroblock change bits */
00741     const unsigned char *mb_change_bits = s->mb_change_bits;
00742     unsigned char mb_change_byte;
00743     unsigned char mb_change_byte_mask;
00744     int mb_change_index;
00745 
00746     /* these variables are for managing the main index stream */
00747     int index_stream_index = 0;  /* yes, the index into the index stream */
00748     int index;
00749 
00750     /* clean out the line buffer */
00751     memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
00752 
00753     GET_NEXT_INDEX();
00754 
00755     for (y = 0; y < s->avctx->height; y++) {
00756 
00757         /* re-init variables for the next line iteration */
00758         horiz_pred = 0;
00759         current_pixel_pair = (unsigned int *)current_line;
00760         vert_pred = s->vert_pred;
00761         mb_change_index = 0;
00762         mb_change_byte = mb_change_bits[mb_change_index++];
00763         mb_change_byte_mask = 0x01;
00764         pixels_left = s->avctx->width;
00765 
00766         while (pixels_left > 0) {
00767 
00768             if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
00769 
00770                 switch (y & 3) {
00771                 case 0:
00772                     /* if macroblock width is 2, apply C-Y-C-Y; else
00773                      * apply C-Y-Y */
00774                     if (s->block_width == 2) {
00775                         APPLY_C_PREDICTOR_24();
00776                         APPLY_Y_PREDICTOR_24();
00777                         OUTPUT_PIXEL_PAIR();
00778                         APPLY_C_PREDICTOR_24();
00779                         APPLY_Y_PREDICTOR_24();
00780                         OUTPUT_PIXEL_PAIR();
00781                     } else {
00782                         APPLY_C_PREDICTOR_24();
00783                         APPLY_Y_PREDICTOR_24();
00784                         OUTPUT_PIXEL_PAIR();
00785                         APPLY_Y_PREDICTOR_24();
00786                         OUTPUT_PIXEL_PAIR();
00787                     }
00788                     break;
00789 
00790                 case 1:
00791                 case 3:
00792                     /* always apply 2 Y predictors on these iterations */
00793                     APPLY_Y_PREDICTOR_24();
00794                     OUTPUT_PIXEL_PAIR();
00795                     APPLY_Y_PREDICTOR_24();
00796                     OUTPUT_PIXEL_PAIR();
00797                     break;
00798 
00799                 case 2:
00800                     /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
00801                      * depending on the macroblock type */
00802                     if (s->block_type == BLOCK_2x2) {
00803                         APPLY_C_PREDICTOR_24();
00804                         APPLY_Y_PREDICTOR_24();
00805                         OUTPUT_PIXEL_PAIR();
00806                         APPLY_C_PREDICTOR_24();
00807                         APPLY_Y_PREDICTOR_24();
00808                         OUTPUT_PIXEL_PAIR();
00809                     } else if (s->block_type == BLOCK_4x2) {
00810                         APPLY_C_PREDICTOR_24();
00811                         APPLY_Y_PREDICTOR_24();
00812                         OUTPUT_PIXEL_PAIR();
00813                         APPLY_Y_PREDICTOR_24();
00814                         OUTPUT_PIXEL_PAIR();
00815                     } else {
00816                         APPLY_Y_PREDICTOR_24();
00817                         OUTPUT_PIXEL_PAIR();
00818                         APPLY_Y_PREDICTOR_24();
00819                         OUTPUT_PIXEL_PAIR();
00820                     }
00821                     break;
00822                 }
00823 
00824             } else {
00825 
00826                 /* skip (copy) four pixels, but reassign the horizontal
00827                  * predictor */
00828                 *vert_pred++ = *current_pixel_pair++;
00829                 horiz_pred = *current_pixel_pair - *vert_pred;
00830                 *vert_pred++ = *current_pixel_pair++;
00831 
00832             }
00833 
00834             if (!keyframe) {
00835                 mb_change_byte_mask <<= 1;
00836 
00837                 /* next byte */
00838                 if (!mb_change_byte_mask) {
00839                     mb_change_byte = mb_change_bits[mb_change_index++];
00840                     mb_change_byte_mask = 0x01;
00841                 }
00842             }
00843 
00844             pixels_left -= 2;
00845         }
00846 
00847         /* next change row */
00848         if (((y + 1) & 3) == 0)
00849             mb_change_bits += s->mb_change_bits_row_size;
00850 
00851         current_line += s->frame.linesize[0];
00852     }
00853 }
00854 
00855 
00856 static int truemotion1_decode_frame(AVCodecContext *avctx,
00857                                     void *data, int *data_size,
00858                                     AVPacket *avpkt)
00859 {
00860     const uint8_t *buf = avpkt->data;
00861     int buf_size = avpkt->size;
00862     TrueMotion1Context *s = avctx->priv_data;
00863 
00864     s->buf = buf;
00865     s->size = buf_size;
00866 
00867     if (truemotion1_decode_header(s) == -1)
00868         return -1;
00869 
00870     s->frame.reference = 3;
00871     s->frame.buffer_hints = FF_BUFFER_HINTS_VALID |
00872         FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
00873     if (avctx->reget_buffer(avctx, &s->frame) < 0) {
00874         av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00875         return -1;
00876     }
00877 
00878     if (compression_types[s->compression].algorithm == ALGO_RGB24H) {
00879         truemotion1_decode_24bit(s);
00880     } else if (compression_types[s->compression].algorithm != ALGO_NOP) {
00881         truemotion1_decode_16bit(s);
00882     }
00883 
00884     *data_size = sizeof(AVFrame);
00885     *(AVFrame*)data = s->frame;
00886 
00887     /* report that the buffer was completely consumed */
00888     return buf_size;
00889 }
00890 
00891 static av_cold int truemotion1_decode_end(AVCodecContext *avctx)
00892 {
00893     TrueMotion1Context *s = avctx->priv_data;
00894 
00895     if (s->frame.data[0])
00896         avctx->release_buffer(avctx, &s->frame);
00897 
00898     av_free(s->vert_pred);
00899 
00900     return 0;
00901 }
00902 
00903 AVCodec ff_truemotion1_decoder = {
00904     .name           = "truemotion1",
00905     .type           = AVMEDIA_TYPE_VIDEO,
00906     .id             = CODEC_ID_TRUEMOTION1,
00907     .priv_data_size = sizeof(TrueMotion1Context),
00908     .init           = truemotion1_decode_init,
00909     .close          = truemotion1_decode_end,
00910     .decode         = truemotion1_decode_frame,
00911     .capabilities   = CODEC_CAP_DR1,
00912     .long_name      = NULL_IF_CONFIG_SMALL("Duck TrueMotion 1.0"),
00913 };