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2ba45a60 DM |
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); | |
f6fa7814 DM |
50 | if (bytestream2_get_bytes_left(&s->gb) < 16 * 8 + 4 * 256) { |
51 | av_frame_free(&s->frame); | |
2ba45a60 | 52 | return AVERROR_INVALIDDATA; |
f6fa7814 | 53 | } |
2ba45a60 DM |
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 = CODEC_CAP_DR1, | |
202 | }; |