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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.         return AVERROR_INVALIDDATA;
  52.  
  53.     bytestream2_skipu(&s->gb, 16 * 8);
  54.     for (i = 0; i < 256; i++)
  55.         s->palette[i] = bytestream2_get_le32u(&s->gb);
  56.  
  57.     return 0;
  58. }
  59.  
  60. /**
  61.  * Perform decode operation
  62.  * @param dst     pointer to destination image buffer
  63.  * @param dst_end pointer to end of destination image buffer
  64.  * @param gb GetByteContext (optional, see below)
  65.  * @param pixel Fill color (optional, see below)
  66.  * @param count Pixel count
  67.  * @param x Pointer to x-axis counter
  68.  * @param width Image width
  69.  * @param linesize Destination image buffer linesize
  70.  * @return non-zero if destination buffer is exhausted
  71.  *
  72.  * a copy operation is achieved when 'gb' is set
  73.  * a fill operation is achieved when 'gb' is null and pixel is >= 0
  74.  * a skip operation is achieved when 'gb' is null and pixel is < 0
  75.  */
  76. static inline int op(uint8_t **dst, const uint8_t *dst_end,
  77.                      GetByteContext *gb,
  78.                      int pixel, int count,
  79.                      int *x, int width, int linesize)
  80. {
  81.     int remaining = width - *x;
  82.     while(count > 0) {
  83.         int striplen = FFMIN(count, remaining);
  84.         if (gb) {
  85.             if (bytestream2_get_bytes_left(gb) < striplen)
  86.                 goto exhausted;
  87.             bytestream2_get_bufferu(gb, *dst, striplen);
  88.         } else if (pixel >= 0)
  89.             memset(*dst, pixel, striplen);
  90.         *dst      += striplen;
  91.         remaining -= striplen;
  92.         count     -= striplen;
  93.         if (remaining <= 0) {
  94.             *dst      += linesize - width;
  95.             remaining  = width;
  96.         }
  97.         if (linesize > 0) {
  98.             if (*dst >= dst_end) goto exhausted;
  99.         } else {
  100.             if (*dst <= dst_end) goto exhausted;
  101.         }
  102.     }
  103.     *x = width - remaining;
  104.     return 0;
  105.  
  106. exhausted:
  107.     *x = width - remaining;
  108.     return 1;
  109. }
  110.  
  111. static int decode_frame(AVCodecContext *avctx,
  112.                         void *data, int *got_frame,
  113.                         AVPacket *avpkt)
  114. {
  115.     AnmContext *s = avctx->priv_data;
  116.     const int buf_size = avpkt->size;
  117.     uint8_t *dst, *dst_end;
  118.     int count, ret;
  119.  
  120.     if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)
  121.         return ret;
  122.     dst     = s->frame->data[0];
  123.     dst_end = s->frame->data[0] + s->frame->linesize[0]*avctx->height;
  124.  
  125.     bytestream2_init(&s->gb, avpkt->data, buf_size);
  126.  
  127.     if (bytestream2_get_byte(&s->gb) != 0x42) {
  128.         avpriv_request_sample(avctx, "Unknown record type");
  129.         return AVERROR_INVALIDDATA;
  130.     }
  131.     if (bytestream2_get_byte(&s->gb)) {
  132.         avpriv_request_sample(avctx, "Padding bytes");
  133.         return AVERROR_PATCHWELCOME;
  134.     }
  135.     bytestream2_skip(&s->gb, 2);
  136.  
  137.     s->x = 0;
  138.     do {
  139.         /* if statements are ordered by probability */
  140. #define OP(gb, pixel, count) \
  141.     op(&dst, dst_end, (gb), (pixel), (count), &s->x, avctx->width, s->frame->linesize[0])
  142.  
  143.         int type = bytestream2_get_byte(&s->gb);
  144.         count = type & 0x7F;
  145.         type >>= 7;
  146.         if (count) {
  147.             if (OP(type ? NULL : &s->gb, -1, count)) break;
  148.         } else if (!type) {
  149.             int pixel;
  150.             count = bytestream2_get_byte(&s->gb);  /* count==0 gives nop */
  151.             pixel = bytestream2_get_byte(&s->gb);
  152.             if (OP(NULL, pixel, count)) break;
  153.         } else {
  154.             int pixel;
  155.             type = bytestream2_get_le16(&s->gb);
  156.             count = type & 0x3FFF;
  157.             type >>= 14;
  158.             if (!count) {
  159.                 if (type == 0)
  160.                     break; // stop
  161.                 if (type == 2) {
  162.                     avpriv_request_sample(avctx, "Unknown opcode");
  163.                     return AVERROR_PATCHWELCOME;
  164.                 }
  165.                 continue;
  166.             }
  167.             pixel = type == 3 ? bytestream2_get_byte(&s->gb) : -1;
  168.             if (type == 1) count += 0x4000;
  169.             if (OP(type == 2 ? &s->gb : NULL, pixel, count)) break;
  170.         }
  171.     } while (bytestream2_get_bytes_left(&s->gb) > 0);
  172.  
  173.     memcpy(s->frame->data[1], s->palette, AVPALETTE_SIZE);
  174.  
  175.     *got_frame = 1;
  176.     if ((ret = av_frame_ref(data, s->frame)) < 0)
  177.         return ret;
  178.  
  179.     return buf_size;
  180. }
  181.  
  182. static av_cold int decode_end(AVCodecContext *avctx)
  183. {
  184.     AnmContext *s = avctx->priv_data;
  185.  
  186.     av_frame_free(&s->frame);
  187.     return 0;
  188. }
  189.  
  190. AVCodec ff_anm_decoder = {
  191.     .name           = "anm",
  192.     .long_name      = NULL_IF_CONFIG_SMALL("Deluxe Paint Animation"),
  193.     .type           = AVMEDIA_TYPE_VIDEO,
  194.     .id             = AV_CODEC_ID_ANM,
  195.     .priv_data_size = sizeof(AnmContext),
  196.     .init           = decode_init,
  197.     .close          = decode_end,
  198.     .decode         = decode_frame,
  199.     .capabilities   = CODEC_CAP_DR1,
  200. };
  201.