af148a6fd0f452ba18339cf1c17e159babfdc4e2
[libav.git] / libavcodec / anm.c
1 /*
2 * Deluxe Paint Animation decoder
3 * Copyright (c) 2009 Peter Ross
4 *
5 * This file is part of Libav.
6 *
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.
11 *
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.
16 *
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
20 */
21
22 /**
23 * @file
24 * Deluxe Paint Animation decoder
25 */
26
27 #include "avcodec.h"
28 #include "bytestream.h"
29
30 typedef struct AnmContext {
31 AVFrame frame;
32 int palette[AVPALETTE_COUNT];
33 GetByteContext gb;
34 int x; ///< x coordinate position
35 } AnmContext;
36
37 static av_cold int decode_init(AVCodecContext *avctx)
38 {
39 AnmContext *s = avctx->priv_data;
40 int i;
41
42 avctx->pix_fmt = AV_PIX_FMT_PAL8;
43
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)
47 return AVERROR_INVALIDDATA;
48
49 bytestream2_skipu(&s->gb, 16 * 8);
50 for (i = 0; i < 256; i++)
51 s->palette[i] = bytestream2_get_le32u(&s->gb);
52
53 return 0;
54 }
55
56 /**
57 * Perform decode operation
58 * @param dst pointer to destination image buffer
59 * @param dst_end pointer to end of destination image buffer
60 * @param gb GetByteContext (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
67 *
68 * a copy operation is achieved when 'gb' is set
69 * a fill operation is achieved when 'gb' is null and pixel is >= 0
70 * a skip operation is achieved when 'gb' is null and pixel is < 0
71 */
72 static inline int op(uint8_t **dst, const uint8_t *dst_end,
73 GetByteContext *gb,
74 int pixel, int count,
75 int *x, int width, int linesize)
76 {
77 int remaining = width - *x;
78 while(count > 0) {
79 int striplen = FFMIN(count, remaining);
80 if (gb) {
81 if (bytestream2_get_bytes_left(gb) < striplen)
82 goto exhausted;
83 bytestream2_get_bufferu(gb, *dst, striplen);
84 } else if (pixel >= 0)
85 memset(*dst, pixel, striplen);
86 *dst += striplen;
87 remaining -= striplen;
88 count -= striplen;
89 if (remaining <= 0) {
90 *dst += linesize - width;
91 remaining = width;
92 }
93 if (linesize > 0) {
94 if (*dst >= dst_end) goto exhausted;
95 } else {
96 if (*dst <= dst_end) goto exhausted;
97 }
98 }
99 *x = width - remaining;
100 return 0;
101
102 exhausted:
103 *x = width - remaining;
104 return 1;
105 }
106
107 static int decode_frame(AVCodecContext *avctx,
108 void *data, int *got_frame,
109 AVPacket *avpkt)
110 {
111 AnmContext *s = avctx->priv_data;
112 const int buf_size = avpkt->size;
113 uint8_t *dst, *dst_end;
114 int count, ret;
115
116 if ((ret = avctx->reget_buffer(avctx, &s->frame)) < 0){
117 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
118 return ret;
119 }
120 dst = s->frame.data[0];
121 dst_end = s->frame.data[0] + s->frame.linesize[0]*avctx->height;
122
123 bytestream2_init(&s->gb, avpkt->data, buf_size);
124
125 if (bytestream2_get_byte(&s->gb) != 0x42) {
126 av_log_ask_for_sample(avctx, "unknown record type\n");
127 return buf_size;
128 }
129 if (bytestream2_get_byte(&s->gb)) {
130 av_log_ask_for_sample(avctx, "padding bytes not supported\n");
131 return buf_size;
132 }
133 bytestream2_skip(&s->gb, 2);
134
135 s->x = 0;
136 do {
137 /* if statements are ordered by probability */
138 #define OP(gb, pixel, count) \
139 op(&dst, dst_end, (gb), (pixel), (count), &s->x, avctx->width, s->frame.linesize[0])
140
141 int type = bytestream2_get_byte(&s->gb);
142 count = type & 0x7F;
143 type >>= 7;
144 if (count) {
145 if (OP(type ? NULL : &s->gb, -1, count)) break;
146 } else if (!type) {
147 int pixel;
148 count = bytestream2_get_byte(&s->gb); /* count==0 gives nop */
149 pixel = bytestream2_get_byte(&s->gb);
150 if (OP(NULL, pixel, count)) break;
151 } else {
152 int pixel;
153 type = bytestream2_get_le16(&s->gb);
154 count = type & 0x3FFF;
155 type >>= 14;
156 if (!count) {
157 if (type == 0)
158 break; // stop
159 if (type == 2) {
160 av_log_ask_for_sample(avctx, "unknown opcode");
161 return AVERROR_PATCHWELCOME;
162 }
163 continue;
164 }
165 pixel = type == 3 ? bytestream2_get_byte(&s->gb) : -1;
166 if (type == 1) count += 0x4000;
167 if (OP(type == 2 ? &s->gb : NULL, pixel, count)) break;
168 }
169 } while (bytestream2_get_bytes_left(&s->gb) > 0);
170
171 memcpy(s->frame.data[1], s->palette, AVPALETTE_SIZE);
172
173 *got_frame = 1;
174 *(AVFrame*)data = s->frame;
175 return buf_size;
176 }
177
178 static av_cold int decode_end(AVCodecContext *avctx)
179 {
180 AnmContext *s = avctx->priv_data;
181 if (s->frame.data[0])
182 avctx->release_buffer(avctx, &s->frame);
183 return 0;
184 }
185
186 AVCodec ff_anm_decoder = {
187 .name = "anm",
188 .type = AVMEDIA_TYPE_VIDEO,
189 .id = AV_CODEC_ID_ANM,
190 .priv_data_size = sizeof(AnmContext),
191 .init = decode_init,
192 .close = decode_end,
193 .decode = decode_frame,
194 .capabilities = CODEC_CAP_DR1,
195 .long_name = NULL_IF_CONFIG_SMALL("Deluxe Paint Animation"),
196 };