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  1. /*
  2.  * Deluxe Paint Animation decoder
  3.  * Copyright (c) 2009 Peter Ross
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. /**
  23.  * @file
  24.  * Deluxe Paint Animation decoder
  25.  */
  26.  
  27. #include "avcodec.h"
  28. #include "bytestream.h"
  29. #include "internal.h"
  30.  
  31. typedef struct AnmContext {
  32.     AVFrame *frame;
  33.     int palette[AVPALETTE_COUNT];
  34.     GetByteContext gb;
  35.     int x;  ///< x coordinate position
  36. } AnmContext;
  37.  
  38. static av_cold int decode_init(AVCodecContext *avctx)
  39. {
  40.     AnmContext *s = avctx->priv_data;
  41.     int i;
  42.  
  43.     avctx->pix_fmt = AV_PIX_FMT_PAL8;
  44.  
  45.     s->frame = av_frame_alloc();
  46.     if (!s->frame)
  47.         return AVERROR(ENOMEM);
  48.  
  49.     bytestream2_init(&s->gb, avctx->extradata, avctx->extradata_size);
  50.     if (bytestream2_get_bytes_left(&s->gb) < 16 * 8 + 4 * 256) {
  51.         av_frame_free(&s->frame);
  52.         return AVERROR_INVALIDDATA;
  53.     }
  54.  
  55.     bytestream2_skipu(&s->gb, 16 * 8);
  56.     for (i = 0; i < 256; i++)
  57.         s->palette[i] = bytestream2_get_le32u(&s->gb);
  58.  
  59.     return 0;
  60. }
  61.  
  62. /**
  63.  * Perform decode operation
  64.  * @param dst     pointer to destination image buffer
  65.  * @param dst_end pointer to end of destination image buffer
  66.  * @param gb GetByteContext (optional, see below)
  67.  * @param pixel Fill color (optional, see below)
  68.  * @param count Pixel count
  69.  * @param x Pointer to x-axis counter
  70.  * @param width Image width
  71.  * @param linesize Destination image buffer linesize
  72.  * @return non-zero if destination buffer is exhausted
  73.  *
  74.  * a copy operation is achieved when 'gb' is set
  75.  * a fill operation is achieved when 'gb' is null and pixel is >= 0
  76.  * a skip operation is achieved when 'gb' is null and pixel is < 0
  77.  */
  78. static inline int op(uint8_t **dst, const uint8_t *dst_end,
  79.                      GetByteContext *gb,
  80.                      int pixel, int count,
  81.                      int *x, int width, int linesize)
  82. {
  83.     int remaining = width - *x;
  84.     while(count > 0) {
  85.         int striplen = FFMIN(count, remaining);
  86.         if (gb) {
  87.             if (bytestream2_get_bytes_left(gb) < striplen)
  88.                 goto exhausted;
  89.             bytestream2_get_bufferu(gb, *dst, striplen);
  90.         } else if (pixel >= 0)
  91.             memset(*dst, pixel, striplen);
  92.         *dst      += striplen;
  93.         remaining -= striplen;
  94.         count     -= striplen;
  95.         if (remaining <= 0) {
  96.             *dst      += linesize - width;
  97.             remaining  = width;
  98.         }
  99.         if (linesize > 0) {
  100.             if (*dst >= dst_end) goto exhausted;
  101.         } else {
  102.             if (*dst <= dst_end) goto exhausted;
  103.         }
  104.     }
  105.     *x = width - remaining;
  106.     return 0;
  107.  
  108. exhausted:
  109.     *x = width - remaining;
  110.     return 1;
  111. }
  112.  
  113. static int decode_frame(AVCodecContext *avctx,
  114.                         void *data, int *got_frame,
  115.                         AVPacket *avpkt)
  116. {
  117.     AnmContext *s = avctx->priv_data;
  118.     const int buf_size = avpkt->size;
  119.     uint8_t *dst, *dst_end;
  120.     int count, ret;
  121.  
  122.     if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)
  123.         return ret;
  124.     dst     = s->frame->data[0];
  125.     dst_end = s->frame->data[0] + s->frame->linesize[0]*avctx->height;
  126.  
  127.     bytestream2_init(&s->gb, avpkt->data, buf_size);
  128.  
  129.     if (bytestream2_get_byte(&s->gb) != 0x42) {
  130.         avpriv_request_sample(avctx, "Unknown record type");
  131.         return AVERROR_INVALIDDATA;
  132.     }
  133.     if (bytestream2_get_byte(&s->gb)) {
  134.         avpriv_request_sample(avctx, "Padding bytes");
  135.         return AVERROR_PATCHWELCOME;
  136.     }
  137.     bytestream2_skip(&s->gb, 2);
  138.  
  139.     s->x = 0;
  140.     do {
  141.         /* if statements are ordered by probability */
  142. #define OP(gb, pixel, count) \
  143.     op(&dst, dst_end, (gb), (pixel), (count), &s->x, avctx->width, s->frame->linesize[0])
  144.  
  145.         int type = bytestream2_get_byte(&s->gb);
  146.         count = type & 0x7F;
  147.         type >>= 7;
  148.         if (count) {
  149.             if (OP(type ? NULL : &s->gb, -1, count)) break;
  150.         } else if (!type) {
  151.             int pixel;
  152.             count = bytestream2_get_byte(&s->gb);  /* count==0 gives nop */
  153.             pixel = bytestream2_get_byte(&s->gb);
  154.             if (OP(NULL, pixel, count)) break;
  155.         } else {
  156.             int pixel;
  157.             type = bytestream2_get_le16(&s->gb);
  158.             count = type & 0x3FFF;
  159.             type >>= 14;
  160.             if (!count) {
  161.                 if (type == 0)
  162.                     break; // stop
  163.                 if (type == 2) {
  164.                     avpriv_request_sample(avctx, "Unknown opcode");
  165.                     return AVERROR_PATCHWELCOME;
  166.                 }
  167.                 continue;
  168.             }
  169.             pixel = type == 3 ? bytestream2_get_byte(&s->gb) : -1;
  170.             if (type == 1) count += 0x4000;
  171.             if (OP(type == 2 ? &s->gb : NULL, pixel, count)) break;
  172.         }
  173.     } while (bytestream2_get_bytes_left(&s->gb) > 0);
  174.  
  175.     memcpy(s->frame->data[1], s->palette, AVPALETTE_SIZE);
  176.  
  177.     *got_frame = 1;
  178.     if ((ret = av_frame_ref(data, s->frame)) < 0)
  179.         return ret;
  180.  
  181.     return buf_size;
  182. }
  183.  
  184. static av_cold int decode_end(AVCodecContext *avctx)
  185. {
  186.     AnmContext *s = avctx->priv_data;
  187.  
  188.     av_frame_free(&s->frame);
  189.     return 0;
  190. }
  191.  
  192. AVCodec ff_anm_decoder = {
  193.     .name           = "anm",
  194.     .long_name      = NULL_IF_CONFIG_SMALL("Deluxe Paint Animation"),
  195.     .type           = AVMEDIA_TYPE_VIDEO,
  196.     .id             = AV_CODEC_ID_ANM,
  197.     .priv_data_size = sizeof(AnmContext),
  198.     .init           = decode_init,
  199.     .close          = decode_end,
  200.     .decode         = decode_frame,
  201.     .capabilities   = AV_CODEC_CAP_DR1,
  202. };
  203.