FFmpeg: libavcodec/flicvideo.c Source File

00001 /*
00002  * FLI/FLC Animation Video Decoder
00003  * Copyright (C) 2003, 2004 the ffmpeg project
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 
00038 #include <stdio.h>
00039 #include <stdlib.h>
00040 #include <string.h>
00041 
00042 #include "libavutil/intreadwrite.h"
00043 #include "avcodec.h"
00044 #include "bytestream.h"
00045 #include "mathops.h"
00046 
00047 #define FLI_256_COLOR 4
00048 #define FLI_DELTA     7
00049 #define FLI_COLOR     11
00050 #define FLI_LC        12
00051 #define FLI_BLACK     13
00052 #define FLI_BRUN      15
00053 #define FLI_COPY      16
00054 #define FLI_MINI      18
00055 #define FLI_DTA_BRUN  25
00056 #define FLI_DTA_COPY  26
00057 #define FLI_DTA_LC    27
00058 
00059 #define FLI_TYPE_CODE     (0xAF11)
00060 #define FLC_FLX_TYPE_CODE (0xAF12)
00061 #define FLC_DTA_TYPE_CODE (0xAF44) /* Marks an "Extended FLC" comes from Dave's Targa Animator (DTA) */
00062 #define FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE (0xAF13)
00063 
00064 #define CHECK_PIXEL_PTR(n) \
00065     if (pixel_ptr + n > pixel_limit) { \
00066         av_log (s->avctx, AV_LOG_ERROR, "Invalid pixel_ptr = %d > pixel_limit = %d\n", \
00067         pixel_ptr + n, pixel_limit); \
00068         return AVERROR_INVALIDDATA; \
00069     } \
00070 
00071 typedef struct FlicDecodeContext {
00072     AVCodecContext *avctx;
00073     AVFrame frame;
00074 
00075     unsigned int palette[256];
00076     int new_palette;
00077     int fli_type;  /* either 0xAF11 or 0xAF12, affects palette resolution */
00078 } FlicDecodeContext;
00079 
00080 static av_cold int flic_decode_init(AVCodecContext *avctx)
00081 {
00082     FlicDecodeContext *s = avctx->priv_data;
00083     unsigned char *fli_header = (unsigned char *)avctx->extradata;
00084     int depth;
00085 
00086     if (avctx->extradata_size != 12 &&
00087         avctx->extradata_size != 128) {
00088         av_log(avctx, AV_LOG_ERROR, "Expected extradata of 12 or 128 bytes\n");
00089         return AVERROR_INVALIDDATA;
00090     }
00091 
00092     s->avctx = avctx;
00093 
00094     s->fli_type = AV_RL16(&fli_header[4]); /* Might be overridden if a Magic Carpet FLC */
00095 
00096     depth = 0;
00097     if (s->avctx->extradata_size == 12) {
00098         /* special case for magic carpet FLIs */
00099         s->fli_type = FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE;
00100         depth = 8;
00101     } else {
00102         depth = AV_RL16(&fli_header[12]);
00103     }
00104 
00105     if (depth == 0) {
00106         depth = 8; /* Some FLC generators set depth to zero, when they mean 8Bpp. Fix up here */
00107     }
00108 
00109     if ((s->fli_type == FLC_FLX_TYPE_CODE) && (depth == 16)) {
00110         depth = 15; /* Original Autodesk FLX's say the depth is 16Bpp when it is really 15Bpp */
00111     }
00112 
00113     switch (depth) {
00114         case 8  : avctx->pix_fmt = PIX_FMT_PAL8; break;
00115         case 15 : avctx->pix_fmt = PIX_FMT_RGB555; break;
00116         case 16 : avctx->pix_fmt = PIX_FMT_RGB565; break;
00117         case 24 : avctx->pix_fmt = PIX_FMT_BGR24; /* Supposedly BGR, but havent any files to test with */
00118                   av_log(avctx, AV_LOG_ERROR, "24Bpp FLC/FLX is unsupported due to no test files.\n");
00119                   return -1;
00120         default :
00121                   av_log(avctx, AV_LOG_ERROR, "Unknown FLC/FLX depth of %d Bpp is unsupported.\n",depth);
00122                   return -1;
00123     }
00124 
00125     avcodec_get_frame_defaults(&s->frame);
00126     s->frame.data[0] = NULL;
00127     s->new_palette = 0;
00128 
00129     return 0;
00130 }
00131 
00132 static int flic_decode_frame_8BPP(AVCodecContext *avctx,
00133                                   void *data, int *data_size,
00134                                   const uint8_t *buf, int buf_size)
00135 {
00136     FlicDecodeContext *s = avctx->priv_data;
00137 
00138     GetByteContext g2;
00139     int pixel_ptr;
00140     int palette_ptr;
00141     unsigned char palette_idx1;
00142     unsigned char palette_idx2;
00143 
00144     unsigned int frame_size;
00145     int num_chunks;
00146 
00147     unsigned int chunk_size;
00148     int chunk_type;
00149 
00150     int i, j;
00151 
00152     int color_packets;
00153     int color_changes;
00154     int color_shift;
00155     unsigned char r, g, b;
00156 
00157     int lines;
00158     int compressed_lines;
00159     int starting_line;
00160     signed short line_packets;
00161     int y_ptr;
00162     int byte_run;
00163     int pixel_skip;
00164     int pixel_countdown;
00165     unsigned char *pixels;
00166     unsigned int pixel_limit;
00167 
00168     bytestream2_init(&g2, buf, buf_size);
00169 
00170     s->frame.reference = 3;
00171     s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
00172     if (avctx->reget_buffer(avctx, &s->frame) < 0) {
00173         av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
00174         return -1;
00175     }
00176 
00177     pixels = s->frame.data[0];
00178     pixel_limit = s->avctx->height * s->frame.linesize[0];
00179     if (buf_size < 16 || buf_size > INT_MAX - (3 * 256 + FF_INPUT_BUFFER_PADDING_SIZE))
00180         return AVERROR_INVALIDDATA;
00181     frame_size = bytestream2_get_le32(&g2);
00182     if (frame_size > buf_size)
00183         frame_size = buf_size;
00184     bytestream2_skip(&g2, 2); /* skip the magic number */
00185     num_chunks = bytestream2_get_le16(&g2);
00186     bytestream2_skip(&g2, 8);  /* skip padding */
00187 
00188     frame_size -= 16;
00189 
00190     /* iterate through the chunks */
00191     while ((frame_size >= 6) && (num_chunks > 0)) {
00192         int stream_ptr_after_chunk;
00193         chunk_size = bytestream2_get_le32(&g2);
00194         if (chunk_size > frame_size) {
00195             av_log(avctx, AV_LOG_WARNING,
00196                    "Invalid chunk_size = %u > frame_size = %u\n", chunk_size, frame_size);
00197             chunk_size = frame_size;
00198         }
00199         stream_ptr_after_chunk = bytestream2_tell(&g2) - 4 + chunk_size;
00200 
00201         chunk_type = bytestream2_get_le16(&g2);
00202 
00203         switch (chunk_type) {
00204         case FLI_256_COLOR:
00205         case FLI_COLOR:
00206             /* check special case: If this file is from the Magic Carpet
00207              * game and uses 6-bit colors even though it reports 256-color
00208              * chunks in a 0xAF12-type file (fli_type is set to 0xAF13 during
00209              * initialization) */
00210             if ((chunk_type == FLI_256_COLOR) && (s->fli_type != FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE))
00211                 color_shift = 0;
00212             else
00213                 color_shift = 2;
00214             /* set up the palette */
00215             color_packets = bytestream2_get_le16(&g2);
00216             palette_ptr = 0;
00217             for (i = 0; i < color_packets; i++) {
00218                 /* first byte is how many colors to skip */
00219                 palette_ptr += bytestream2_get_byte(&g2);
00220 
00221                 /* next byte indicates how many entries to change */
00222                 color_changes = bytestream2_get_byte(&g2);
00223 
00224                 /* if there are 0 color changes, there are actually 256 */
00225                 if (color_changes == 0)
00226                     color_changes = 256;
00227 
00228                 if (bytestream2_tell(&g2) + color_changes * 3 > stream_ptr_after_chunk)
00229                     break;
00230 
00231                 for (j = 0; j < color_changes; j++) {
00232                     unsigned int entry;
00233 
00234                     /* wrap around, for good measure */
00235                     if ((unsigned)palette_ptr >= 256)
00236                         palette_ptr = 0;
00237 
00238                     r = bytestream2_get_byte(&g2) << color_shift;
00239                     g = bytestream2_get_byte(&g2) << color_shift;
00240                     b = bytestream2_get_byte(&g2) << color_shift;
00241                     entry = 0xFF << 24 | r << 16 | g << 8 | b;
00242                     if (color_shift == 2)
00243                         entry |= entry >> 6 & 0x30303;
00244                     if (s->palette[palette_ptr] != entry)
00245                         s->new_palette = 1;
00246                     s->palette[palette_ptr++] = entry;
00247                 }
00248             }
00249             break;
00250 
00251         case FLI_DELTA:
00252             y_ptr = 0;
00253             compressed_lines = bytestream2_get_le16(&g2);
00254             while (compressed_lines > 0) {
00255                 if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk)
00256                     break;
00257                 line_packets = bytestream2_get_le16(&g2);
00258                 if ((line_packets & 0xC000) == 0xC000) {
00259                     // line skip opcode
00260                     line_packets = -line_packets;
00261                     y_ptr += line_packets * s->frame.linesize[0];
00262                 } else if ((line_packets & 0xC000) == 0x4000) {
00263                     av_log(avctx, AV_LOG_ERROR, "Undefined opcode (%x) in DELTA_FLI\n", line_packets);
00264                 } else if ((line_packets & 0xC000) == 0x8000) {
00265                     // "last byte" opcode
00266                     pixel_ptr= y_ptr + s->frame.linesize[0] - 1;
00267                     CHECK_PIXEL_PTR(0);
00268                     pixels[pixel_ptr] = line_packets & 0xff;
00269                 } else {
00270                     compressed_lines--;
00271                     pixel_ptr = y_ptr;
00272                     CHECK_PIXEL_PTR(0);
00273                     pixel_countdown = s->avctx->width;
00274                     for (i = 0; i < line_packets; i++) {
00275                         if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk)
00276                             break;
00277                         /* account for the skip bytes */
00278                         pixel_skip = bytestream2_get_byte(&g2);
00279                         pixel_ptr += pixel_skip;
00280                         pixel_countdown -= pixel_skip;
00281                         byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
00282                         if (byte_run < 0) {
00283                             byte_run = -byte_run;
00284                             palette_idx1 = bytestream2_get_byte(&g2);
00285                             palette_idx2 = bytestream2_get_byte(&g2);
00286                             CHECK_PIXEL_PTR(byte_run * 2);
00287                             for (j = 0; j < byte_run; j++, pixel_countdown -= 2) {
00288                                 pixels[pixel_ptr++] = palette_idx1;
00289                                 pixels[pixel_ptr++] = palette_idx2;
00290                             }
00291                         } else {
00292                             CHECK_PIXEL_PTR(byte_run * 2);
00293                             if (bytestream2_tell(&g2) + byte_run * 2 > stream_ptr_after_chunk)
00294                                 break;
00295                             for (j = 0; j < byte_run * 2; j++, pixel_countdown--) {
00296                                 pixels[pixel_ptr++] = bytestream2_get_byte(&g2);
00297                             }
00298                         }
00299                     }
00300 
00301                     y_ptr += s->frame.linesize[0];
00302                 }
00303             }
00304             break;
00305 
00306         case FLI_LC:
00307             /* line compressed */
00308             starting_line = bytestream2_get_le16(&g2);
00309             y_ptr = 0;
00310             y_ptr += starting_line * s->frame.linesize[0];
00311 
00312             compressed_lines = bytestream2_get_le16(&g2);
00313             while (compressed_lines > 0) {
00314                 pixel_ptr = y_ptr;
00315                 CHECK_PIXEL_PTR(0);
00316                 pixel_countdown = s->avctx->width;
00317                 if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)
00318                     break;
00319                 line_packets = bytestream2_get_byte(&g2);
00320                 if (line_packets > 0) {
00321                     for (i = 0; i < line_packets; i++) {
00322                         /* account for the skip bytes */
00323                         if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)
00324                             break;
00325                         pixel_skip = bytestream2_get_byte(&g2);
00326                         pixel_ptr += pixel_skip;
00327                         pixel_countdown -= pixel_skip;
00328                         byte_run = sign_extend(bytestream2_get_byte(&g2),8);
00329                         if (byte_run > 0) {
00330                             CHECK_PIXEL_PTR(byte_run);
00331                             if (bytestream2_tell(&g2) + byte_run > stream_ptr_after_chunk)
00332                                 break;
00333                             for (j = 0; j < byte_run; j++, pixel_countdown--) {
00334                                 pixels[pixel_ptr++] = bytestream2_get_byte(&g2);
00335                             }
00336                         } else if (byte_run < 0) {
00337                             byte_run = -byte_run;
00338                             palette_idx1 = bytestream2_get_byte(&g2);
00339                             CHECK_PIXEL_PTR(byte_run);
00340                             for (j = 0; j < byte_run; j++, pixel_countdown--) {
00341                                 pixels[pixel_ptr++] = palette_idx1;
00342                             }
00343                         }
00344                     }
00345                 }
00346 
00347                 y_ptr += s->frame.linesize[0];
00348                 compressed_lines--;
00349             }
00350             break;
00351 
00352         case FLI_BLACK:
00353             /* set the whole frame to color 0 (which is usually black) */
00354             memset(pixels, 0,
00355                 s->frame.linesize[0] * s->avctx->height);
00356             break;
00357 
00358         case FLI_BRUN:
00359             /* Byte run compression: This chunk type only occurs in the first
00360              * FLI frame and it will update the entire frame. */
00361             y_ptr = 0;
00362             for (lines = 0; lines < s->avctx->height; lines++) {
00363                 pixel_ptr = y_ptr;
00364                 /* disregard the line packets; instead, iterate through all
00365                  * pixels on a row */
00366                  bytestream2_skip(&g2, 1);
00367                 pixel_countdown = s->avctx->width;
00368                 while (pixel_countdown > 0) {
00369                     if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)
00370                         break;
00371                     byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
00372                     if (byte_run > 0) {
00373                         palette_idx1 = bytestream2_get_byte(&g2);
00374                         CHECK_PIXEL_PTR(byte_run);
00375                         for (j = 0; j < byte_run; j++) {
00376                             pixels[pixel_ptr++] = palette_idx1;
00377                             pixel_countdown--;
00378                             if (pixel_countdown < 0)
00379                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
00380                                        pixel_countdown, lines);
00381                         }
00382                     } else {  /* copy bytes if byte_run < 0 */
00383                         byte_run = -byte_run;
00384                         CHECK_PIXEL_PTR(byte_run);
00385                         if (bytestream2_tell(&g2) + byte_run > stream_ptr_after_chunk)
00386                             break;
00387                         for (j = 0; j < byte_run; j++) {
00388                             pixels[pixel_ptr++] = bytestream2_get_byte(&g2);
00389                             pixel_countdown--;
00390                             if (pixel_countdown < 0)
00391                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
00392                                        pixel_countdown, lines);
00393                         }
00394                     }
00395                 }
00396 
00397                 y_ptr += s->frame.linesize[0];
00398             }
00399             break;
00400 
00401         case FLI_COPY:
00402             /* copy the chunk (uncompressed frame) */
00403             if (chunk_size - 6 != s->avctx->width * s->avctx->height) {
00404                 av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \
00405                        "has incorrect size, skipping chunk\n", chunk_size - 6);
00406                 bytestream2_skip(&g2, chunk_size - 6);
00407             } else {
00408                 for (y_ptr = 0; y_ptr < s->frame.linesize[0] * s->avctx->height;
00409                      y_ptr += s->frame.linesize[0]) {
00410                     bytestream2_get_buffer(&g2, &pixels[y_ptr],
00411                                            s->avctx->width);
00412                 }
00413             }
00414             break;
00415 
00416         case FLI_MINI:
00417             /* some sort of a thumbnail? disregard this chunk... */
00418             break;
00419 
00420         default:
00421             av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);
00422             break;
00423         }
00424 
00425         if (stream_ptr_after_chunk - bytestream2_tell(&g2) > 0)
00426             bytestream2_skip(&g2, stream_ptr_after_chunk - bytestream2_tell(&g2));
00427 
00428         frame_size -= chunk_size;
00429         num_chunks--;
00430     }
00431 
00432     /* by the end of the chunk, the stream ptr should equal the frame
00433      * size (minus 1, possibly); if it doesn't, issue a warning */
00434     if ((bytestream2_get_bytes_left(&g2) != 0) &&
00435         (bytestream2_get_bytes_left(&g2) != 1))
00436         av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
00437                "and final chunk ptr = %d\n", buf_size,
00438                buf_size - bytestream2_get_bytes_left(&g2));
00439 
00440     /* make the palette available on the way out */
00441     memcpy(s->frame.data[1], s->palette, AVPALETTE_SIZE);
00442     if (s->new_palette) {
00443         s->frame.palette_has_changed = 1;
00444         s->new_palette = 0;
00445     }
00446 
00447     *data_size=sizeof(AVFrame);
00448     *(AVFrame*)data = s->frame;
00449 
00450     return buf_size;
00451 }
00452 
00453 static int flic_decode_frame_15_16BPP(AVCodecContext *avctx,
00454                                       void *data, int *data_size,
00455                                       const uint8_t *buf, int buf_size)
00456 {
00457     /* Note, the only difference between the 15Bpp and 16Bpp */
00458     /* Format is the pixel format, the packets are processed the same. */
00459     FlicDecodeContext *s = avctx->priv_data;
00460 
00461     GetByteContext g2;
00462     int pixel_ptr;
00463     unsigned char palette_idx1;
00464 
00465     unsigned int frame_size;
00466     int num_chunks;
00467 
00468     unsigned int chunk_size;
00469     int chunk_type;
00470 
00471     int i, j;
00472 
00473     int lines;
00474     int compressed_lines;
00475     signed short line_packets;
00476     int y_ptr;
00477     int byte_run;
00478     int pixel_skip;
00479     int pixel_countdown;
00480     unsigned char *pixels;
00481     int pixel;
00482     unsigned int pixel_limit;
00483 
00484     bytestream2_init(&g2, buf, buf_size);
00485 
00486     s->frame.reference = 3;
00487     s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
00488     if (avctx->reget_buffer(avctx, &s->frame) < 0) {
00489         av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
00490         return -1;
00491     }
00492 
00493     pixels = s->frame.data[0];
00494     pixel_limit = s->avctx->height * s->frame.linesize[0];
00495 
00496     frame_size = bytestream2_get_le32(&g2);
00497     bytestream2_skip(&g2, 2);  /* skip the magic number */
00498     num_chunks = bytestream2_get_le16(&g2);
00499     bytestream2_skip(&g2, 8);  /* skip padding */
00500     if (frame_size > buf_size)
00501         frame_size = buf_size;
00502 
00503     frame_size -= 16;
00504 
00505     /* iterate through the chunks */
00506     while ((frame_size > 0) && (num_chunks > 0)) {
00507         int stream_ptr_after_chunk;
00508         chunk_size = bytestream2_get_le32(&g2);
00509         if (chunk_size > frame_size) {
00510             av_log(avctx, AV_LOG_WARNING,
00511                    "Invalid chunk_size = %u > frame_size = %u\n", chunk_size, frame_size);
00512             chunk_size = frame_size;
00513         }
00514         stream_ptr_after_chunk = bytestream2_tell(&g2) - 4 + chunk_size;
00515 
00516         chunk_type = bytestream2_get_le16(&g2);
00517 
00518 
00519         switch (chunk_type) {
00520         case FLI_256_COLOR:
00521         case FLI_COLOR:
00522             /* For some reason, it seems that non-palettized flics do
00523              * include one of these chunks in their first frame.
00524              * Why I do not know, it seems rather extraneous. */
00525 /*            av_log(avctx, AV_LOG_ERROR, "Unexpected Palette chunk %d in non-paletised FLC\n",chunk_type);*/
00526             bytestream2_skip(&g2, chunk_size - 6);
00527             break;
00528 
00529         case FLI_DELTA:
00530         case FLI_DTA_LC:
00531             y_ptr = 0;
00532             compressed_lines = bytestream2_get_le16(&g2);
00533             while (compressed_lines > 0) {
00534                 if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk)
00535                     break;
00536                 line_packets = bytestream2_get_le16(&g2);
00537                 if (line_packets < 0) {
00538                     line_packets = -line_packets;
00539                     y_ptr += line_packets * s->frame.linesize[0];
00540                 } else {
00541                     compressed_lines--;
00542                     pixel_ptr = y_ptr;
00543                     CHECK_PIXEL_PTR(0);
00544                     pixel_countdown = s->avctx->width;
00545                     for (i = 0; i < line_packets; i++) {
00546                         /* account for the skip bytes */
00547                         if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk)
00548                             break;
00549                         pixel_skip = bytestream2_get_byte(&g2);
00550                         pixel_ptr += (pixel_skip*2); /* Pixel is 2 bytes wide */
00551                         pixel_countdown -= pixel_skip;
00552                         byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
00553                         if (byte_run < 0) {
00554                             byte_run = -byte_run;
00555                             pixel    = bytestream2_get_le16(&g2);
00556                             CHECK_PIXEL_PTR(2 * byte_run);
00557                             for (j = 0; j < byte_run; j++, pixel_countdown -= 2) {
00558                                 *((signed short*)(&pixels[pixel_ptr])) = pixel;
00559                                 pixel_ptr += 2;
00560                             }
00561                         } else {
00562                             if (bytestream2_tell(&g2) + 2*byte_run > stream_ptr_after_chunk)
00563                                 break;
00564                             CHECK_PIXEL_PTR(2 * byte_run);
00565                             for (j = 0; j < byte_run; j++, pixel_countdown--) {
00566                                 *((signed short*)(&pixels[pixel_ptr])) = bytestream2_get_le16(&g2);
00567                                 pixel_ptr += 2;
00568                             }
00569                         }
00570                     }
00571 
00572                     y_ptr += s->frame.linesize[0];
00573                 }
00574             }
00575             break;
00576 
00577         case FLI_LC:
00578             av_log(avctx, AV_LOG_ERROR, "Unexpected FLI_LC chunk in non-paletised FLC\n");
00579             bytestream2_skip(&g2, chunk_size - 6);
00580             break;
00581 
00582         case FLI_BLACK:
00583             /* set the whole frame to 0x0000 which is black in both 15Bpp and 16Bpp modes. */
00584             memset(pixels, 0x0000,
00585                    s->frame.linesize[0] * s->avctx->height);
00586             break;
00587 
00588         case FLI_BRUN:
00589             y_ptr = 0;
00590             for (lines = 0; lines < s->avctx->height; lines++) {
00591                 pixel_ptr = y_ptr;
00592                 /* disregard the line packets; instead, iterate through all
00593                  * pixels on a row */
00594                 bytestream2_skip(&g2, 1);
00595                 pixel_countdown = (s->avctx->width * 2);
00596 
00597                 while (pixel_countdown > 0) {
00598                     if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)
00599                         break;
00600                     byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
00601                     if (byte_run > 0) {
00602                         palette_idx1 = bytestream2_get_byte(&g2);
00603                         CHECK_PIXEL_PTR(byte_run);
00604                         for (j = 0; j < byte_run; j++) {
00605                             pixels[pixel_ptr++] = palette_idx1;
00606                             pixel_countdown--;
00607                             if (pixel_countdown < 0)
00608                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) (linea%d)\n",
00609                                        pixel_countdown, lines);
00610                         }
00611                     } else {  /* copy bytes if byte_run < 0 */
00612                         byte_run = -byte_run;
00613                         if (bytestream2_tell(&g2) + byte_run > stream_ptr_after_chunk)
00614                             break;
00615                         CHECK_PIXEL_PTR(byte_run);
00616                         for (j = 0; j < byte_run; j++) {
00617                             palette_idx1 = bytestream2_get_byte(&g2);
00618                             pixels[pixel_ptr++] = palette_idx1;
00619                             pixel_countdown--;
00620                             if (pixel_countdown < 0)
00621                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
00622                                        pixel_countdown, lines);
00623                         }
00624                     }
00625                 }
00626 
00627                 /* Now FLX is strange, in that it is "byte" as opposed to "pixel" run length compressed.
00628                  * This does not give us any good oportunity to perform word endian conversion
00629                  * during decompression. So if it is required (i.e., this is not a LE target, we do
00630                  * a second pass over the line here, swapping the bytes.
00631                  */
00632 #if HAVE_BIGENDIAN
00633                 pixel_ptr = y_ptr;
00634                 pixel_countdown = s->avctx->width;
00635                 while (pixel_countdown > 0) {
00636                     *((signed short*)(&pixels[pixel_ptr])) = AV_RL16(&buf[pixel_ptr]);
00637                     pixel_ptr += 2;
00638                 }
00639 #endif
00640                 y_ptr += s->frame.linesize[0];
00641             }
00642             break;
00643 
00644         case FLI_DTA_BRUN:
00645             y_ptr = 0;
00646             for (lines = 0; lines < s->avctx->height; lines++) {
00647                 pixel_ptr = y_ptr;
00648                 /* disregard the line packets; instead, iterate through all
00649                  * pixels on a row */
00650                 bytestream2_skip(&g2, 1);
00651                 pixel_countdown = s->avctx->width; /* Width is in pixels, not bytes */
00652 
00653                 while (pixel_countdown > 0) {
00654                     if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)
00655                         break;
00656                     byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
00657                     if (byte_run > 0) {
00658                         pixel    = bytestream2_get_le16(&g2);
00659                         CHECK_PIXEL_PTR(2 * byte_run);
00660                         for (j = 0; j < byte_run; j++) {
00661                             *((signed short*)(&pixels[pixel_ptr])) = pixel;
00662                             pixel_ptr += 2;
00663                             pixel_countdown--;
00664                             if (pixel_countdown < 0)
00665                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
00666                                        pixel_countdown);
00667                         }
00668                     } else {  /* copy pixels if byte_run < 0 */
00669                         byte_run = -byte_run;
00670                         if (bytestream2_tell(&g2) + 2 * byte_run > stream_ptr_after_chunk)
00671                             break;
00672                         CHECK_PIXEL_PTR(2 * byte_run);
00673                         for (j = 0; j < byte_run; j++) {
00674                             *((signed short*)(&pixels[pixel_ptr])) = bytestream2_get_le16(&g2);
00675                             pixel_ptr  += 2;
00676                             pixel_countdown--;
00677                             if (pixel_countdown < 0)
00678                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
00679                                        pixel_countdown);
00680                         }
00681                     }
00682                 }
00683 
00684                 y_ptr += s->frame.linesize[0];
00685             }
00686             break;
00687 
00688         case FLI_COPY:
00689         case FLI_DTA_COPY:
00690             /* copy the chunk (uncompressed frame) */
00691             if (chunk_size - 6 > (unsigned int)(s->avctx->width * s->avctx->height)*2) {
00692                 av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \
00693                        "bigger than image, skipping chunk\n", chunk_size - 6);
00694                 bytestream2_skip(&g2, chunk_size - 6);
00695             } else {
00696 
00697                 for (y_ptr = 0; y_ptr < s->frame.linesize[0] * s->avctx->height;
00698                      y_ptr += s->frame.linesize[0]) {
00699 
00700                     pixel_countdown = s->avctx->width;
00701                     pixel_ptr = 0;
00702                     while (pixel_countdown > 0) {
00703                       *((signed short*)(&pixels[y_ptr + pixel_ptr])) = bytestream2_get_le16(&g2);
00704                       pixel_ptr += 2;
00705                       pixel_countdown--;
00706                     }
00707                 }
00708             }
00709             break;
00710 
00711         case FLI_MINI:
00712             /* some sort of a thumbnail? disregard this chunk... */
00713             bytestream2_skip(&g2, chunk_size - 6);
00714             break;
00715 
00716         default:
00717             av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);
00718             break;
00719         }
00720 
00721         frame_size -= chunk_size;
00722         num_chunks--;
00723     }
00724 
00725     /* by the end of the chunk, the stream ptr should equal the frame
00726      * size (minus 1, possibly); if it doesn't, issue a warning */
00727     if ((bytestream2_get_bytes_left(&g2) != 0) && (bytestream2_get_bytes_left(&g2) != 1))
00728         av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
00729                "and final chunk ptr = %d\n", buf_size, bytestream2_tell(&g2));
00730 
00731 
00732     *data_size=sizeof(AVFrame);
00733     *(AVFrame*)data = s->frame;
00734 
00735     return buf_size;
00736 }
00737 
00738 static int flic_decode_frame_24BPP(AVCodecContext *avctx,
00739                                    void *data, int *data_size,
00740                                    const uint8_t *buf, int buf_size)
00741 {
00742   av_log(avctx, AV_LOG_ERROR, "24Bpp FLC Unsupported due to lack of test files.\n");
00743   return -1;
00744 }
00745 
00746 static int flic_decode_frame(AVCodecContext *avctx,
00747                              void *data, int *data_size,
00748                              AVPacket *avpkt)
00749 {
00750     const uint8_t *buf = avpkt->data;
00751     int buf_size = avpkt->size;
00752     if (avctx->pix_fmt == PIX_FMT_PAL8) {
00753       return flic_decode_frame_8BPP(avctx, data, data_size,
00754                                     buf, buf_size);
00755     }
00756     else if ((avctx->pix_fmt == PIX_FMT_RGB555) ||
00757              (avctx->pix_fmt == PIX_FMT_RGB565)) {
00758       return flic_decode_frame_15_16BPP(avctx, data, data_size,
00759                                         buf, buf_size);
00760     }
00761     else if (avctx->pix_fmt == PIX_FMT_BGR24) {
00762       return flic_decode_frame_24BPP(avctx, data, data_size,
00763                                      buf, buf_size);
00764     }
00765 
00766     /* Should not get  here, ever as the pix_fmt is processed */
00767     /* in flic_decode_init and the above if should deal with */
00768     /* the finite set of possibilites allowable by here. */
00769     /* But in case we do, just error out. */
00770     av_log(avctx, AV_LOG_ERROR, "Unknown FLC format, my science cannot explain how this happened.\n");
00771     return -1;
00772 }
00773 
00774 
00775 static av_cold int flic_decode_end(AVCodecContext *avctx)
00776 {
00777     FlicDecodeContext *s = avctx->priv_data;
00778 
00779     if (s->frame.data[0])
00780         avctx->release_buffer(avctx, &s->frame);
00781 
00782     return 0;
00783 }
00784 
00785 AVCodec ff_flic_decoder = {
00786     .name           = "flic",
00787     .type           = AVMEDIA_TYPE_VIDEO,
00788     .id             = CODEC_ID_FLIC,
00789     .priv_data_size = sizeof(FlicDecodeContext),
00790     .init           = flic_decode_init,
00791     .close          = flic_decode_end,
00792     .decode         = flic_decode_frame,
00793     .capabilities   = CODEC_CAP_DR1,
00794     .long_name = NULL_IF_CONFIG_SMALL("Autodesk Animator Flic video"),
00795 };