2 * Deluxe Paint Animation decoder
3 * Copyright (c) 2009 Peter Ross
5 * This file is part of Libav.
7 * Libav 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.
12 * Libav 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.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 * Deluxe Paint Animation decoder
28 #include "bytestream.h"
30 typedef struct AnmContext {
32 int palette[AVPALETTE_COUNT];
34 int x; ///< x coordinate position
37 static av_cold int decode_init(AVCodecContext *avctx)
39 AnmContext *s = avctx->priv_data;
42 avctx->pix_fmt = PIX_FMT_PAL8;
44 s->frame.reference = 1;
45 bytestream2_init(&s->gb, avctx->extradata, avctx->extradata_size);
46 if (bytestream2_get_bytes_left(&s->gb) < 16 * 8 + 4 * 256)
49 bytestream2_skipu(&s->gb, 16 * 8);
50 for (i = 0; i < 256; i++)
51 s->palette[i] = bytestream2_get_le32u(&s->gb);
57 * Perform decode operation
58 * @param dst, dst_end Destination image buffer
59 * @param gb, GetByteContext (optional, see below)
60 * @param pixel Fill color (optional, see below)
61 * @param count Pixel count
62 * @param x Pointer to x-axis counter
63 * @param width Image width
64 * @param linesize Destination image buffer linesize
65 * @return non-zero if destination buffer is exhausted
67 * a copy operation is achieved when 'gb' is set
68 * a fill operation is achieved when 'gb' is null and pixel is >= 0
69 * a skip operation is achieved when 'gb' is null and pixel is < 0
71 static inline int op(uint8_t **dst, const uint8_t *dst_end,
74 int *x, int width, int linesize)
76 int remaining = width - *x;
78 int striplen = FFMIN(count, remaining);
80 if (bytestream2_get_bytes_left(gb) < striplen)
82 bytestream2_get_bufferu(gb, *dst, striplen);
83 } else if (pixel >= 0)
84 memset(*dst, pixel, striplen);
86 remaining -= striplen;
89 *dst += linesize - width;
93 if (*dst >= dst_end) goto exhausted;
95 if (*dst <= dst_end) goto exhausted;
98 *x = width - remaining;
102 *x = width - remaining;
106 static int decode_frame(AVCodecContext *avctx,
107 void *data, int *data_size,
110 AnmContext *s = avctx->priv_data;
111 const int buf_size = avpkt->size;
112 uint8_t *dst, *dst_end;
115 if(avctx->reget_buffer(avctx, &s->frame) < 0){
116 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
119 dst = s->frame.data[0];
120 dst_end = s->frame.data[0] + s->frame.linesize[0]*avctx->height;
122 bytestream2_init(&s->gb, avpkt->data, buf_size);
124 if (bytestream2_get_byte(&s->gb) != 0x42) {
125 av_log_ask_for_sample(avctx, "unknown record type\n");
128 if (bytestream2_get_byte(&s->gb)) {
129 av_log_ask_for_sample(avctx, "padding bytes not supported\n");
132 bytestream2_skip(&s->gb, 2);
136 /* if statements are ordered by probability */
137 #define OP(gb, pixel, count) \
138 op(&dst, dst_end, (gb), (pixel), (count), &s->x, avctx->width, s->frame.linesize[0])
140 int type = bytestream2_get_byte(&s->gb);
144 if (OP(type ? NULL : &s->gb, -1, count)) break;
147 count = bytestream2_get_byte(&s->gb); /* count==0 gives nop */
148 pixel = bytestream2_get_byte(&s->gb);
149 if (OP(NULL, pixel, count)) break;
152 type = bytestream2_get_le16(&s->gb);
153 count = type & 0x3FFF;
159 av_log_ask_for_sample(avctx, "unknown opcode");
160 return AVERROR_INVALIDDATA;
164 pixel = type == 3 ? bytestream2_get_byte(&s->gb) : -1;
165 if (type == 1) count += 0x4000;
166 if (OP(type == 2 ? &s->gb : NULL, pixel, count)) break;
168 } while (bytestream2_get_bytes_left(&s->gb) > 0);
170 memcpy(s->frame.data[1], s->palette, AVPALETTE_SIZE);
172 *data_size = sizeof(AVFrame);
173 *(AVFrame*)data = s->frame;
177 static av_cold int decode_end(AVCodecContext *avctx)
179 AnmContext *s = avctx->priv_data;
180 if (s->frame.data[0])
181 avctx->release_buffer(avctx, &s->frame);
185 AVCodec ff_anm_decoder = {
187 .type = AVMEDIA_TYPE_VIDEO,
189 .priv_data_size = sizeof(AnmContext),
192 .decode = decode_frame,
193 .capabilities = CODEC_CAP_DR1,
194 .long_name = NULL_IF_CONFIG_SMALL("Deluxe Paint Animation"),