blob: 72684189bbbc3dfb49e90edac5fe42cb8c6d5604
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 | .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, |
203 | }; |
204 |