2 * Deluxe Paint Animation decoder
3 * Copyright (c) 2009 Peter Ross
5 * This file is part of FFmpeg.
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.
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.
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
24 * Deluxe Paint Animation decoder
28 #include "bytestream.h"
30 typedef struct AnmContext {
32 int palette[AVPALETTE_COUNT];
33 int x; ///< x coordinate position
36 static av_cold int decode_init(AVCodecContext *avctx)
38 AnmContext *s = avctx->priv_data;
42 avctx->pix_fmt = PIX_FMT_PAL8;
44 if (avctx->extradata_size != 16*8 + 4*256)
47 avcodec_get_frame_defaults(&s->frame);
48 s->frame.reference = 1;
50 buf = avctx->extradata + 16*8;
51 for (i = 0; i < 256; i++)
52 s->palette[i] = bytestream_get_le32(&buf);
58 * Perform decode operation
59 * @param dst, dst_end Destination image buffer
60 * @param buf, buf_end Source buffer (optional, see below)
61 * @param pixel Fill color (optional, see below)
62 * @param count Pixel count
63 * @param x Pointer to x-axis counter
64 * @param width Image width
65 * @param linesize Destination image buffer linesize
66 * @return non-zero if destination buffer is exhausted
68 * a copy operation is achieved when 'buf' is set
69 * a fill operation is acheived when 'buf' is null and pixel is >= 0
70 * a skip operation is acheived when 'buf' is null and pixel is < 0
72 static inline int op(uint8_t **dst, const uint8_t *dst_end,
73 const uint8_t **buf, const uint8_t *buf_end,
75 int *x, int width, int linesize)
77 int remaining = width - *x;
79 int striplen = FFMIN(count, remaining);
81 striplen = FFMIN(striplen, buf_end - *buf);
84 memcpy(*dst, *buf, striplen);
86 } else if (pixel >= 0)
87 memset(*dst, pixel, striplen);
89 remaining -= striplen;
92 *dst += linesize - width;
96 if (*dst >= dst_end) goto exhausted;
98 if (*dst <= dst_end) goto exhausted;
101 *x = width - remaining;
105 *x = width - remaining;
109 static int decode_frame(AVCodecContext *avctx,
110 void *data, int *data_size,
113 AnmContext *s = avctx->priv_data;
114 const uint8_t *buf = avpkt->data;
115 const int buf_size = avpkt->size;
116 const uint8_t *buf_end = buf + buf_size;
117 uint8_t *dst, *dst_end;
120 if(avctx->reget_buffer(avctx, &s->frame) < 0){
121 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
124 dst = s->frame.data[0];
125 dst_end = s->frame.data[0] + s->frame.linesize[0]*avctx->height;
127 if (buf[0] != 0x42) {
128 av_log_ask_for_sample(avctx, "unknown record type\n");
132 av_log_ask_for_sample(avctx, "padding bytes not supported\n");
139 /* if statements are ordered by probability */
140 #define OP(buf, pixel, count) \
141 op(&dst, dst_end, (buf), buf_end, (pixel), (count), &s->x, avctx->width, s->frame.linesize[0])
143 int type = bytestream_get_byte(&buf);
147 if (OP(type ? NULL : &buf, -1, count)) break;
150 count = bytestream_get_byte(&buf); /* count==0 gives nop */
151 pixel = bytestream_get_byte(&buf);
152 if (OP(NULL, pixel, count)) break;
155 type = bytestream_get_le16(&buf);
156 count = type & 0x3FFF;
162 av_log_ask_for_sample(avctx, "unknown opcode");
163 return AVERROR_INVALIDDATA;
167 pixel = type == 3 ? bytestream_get_byte(&buf) : -1;
168 if (type == 1) count += 0x4000;
169 if (OP(type == 2 ? &buf : NULL, pixel, count)) break;
171 } while (buf + 1 < buf_end);
173 memcpy(s->frame.data[1], s->palette, AVPALETTE_SIZE);
175 *data_size = sizeof(AVFrame);
176 *(AVFrame*)data = s->frame;
180 static av_cold int decode_end(AVCodecContext *avctx)
182 AnmContext *s = avctx->priv_data;
183 if (s->frame.data[0])
184 avctx->release_buffer(avctx, &s->frame);
188 AVCodec ff_anm_decoder = {
190 .type = AVMEDIA_TYPE_VIDEO,
192 .priv_data_size = sizeof(AnmContext),
195 .decode = decode_frame,
196 .capabilities = CODEC_CAP_DR1,
197 .long_name = NULL_IF_CONFIG_SMALL("Deluxe Paint Animation"),