FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/arbc.c
Date: 2021-09-16 08:47:15
Exec Total Coverage
Lines: 0 113 0.0%
Branches: 0 68 0.0%

Line Branch Exec Source
1 /*
2 * Gryphon's Anim Compressor decoder
3 * Copyright (c) 2019 Paul B Mahol
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 #include <stdio.h>
23 #include <stdlib.h>
24 #include <string.h>
25
26 #include "libavutil/imgutils.h"
27 #include "libavutil/internal.h"
28 #include "libavutil/intreadwrite.h"
29
30 #include "avcodec.h"
31 #include "bytestream.h"
32 #include "internal.h"
33
34 typedef struct ARBCContext {
35 GetByteContext gb;
36
37 AVFrame *prev_frame;
38 } ARBCContext;
39
40 static int fill_tile4(AVCodecContext *avctx, int color, AVFrame *frame)
41 {
42 ARBCContext *s = avctx->priv_data;
43 GetByteContext *gb = &s->gb;
44 int nb_tiles = bytestream2_get_le16(gb);
45 int h = avctx->height - 1;
46 int pixels_overwritten = 0;
47
48 if ((avctx->width / 4 + 1) * (avctx->height / 4 + 1) < nb_tiles)
49 return 0;
50
51 for (int i = 0; i < nb_tiles; i++) {
52 int y = bytestream2_get_byte(gb);
53 int x = bytestream2_get_byte(gb);
54 uint16_t mask = bytestream2_get_le16(gb);
55 int start_y = y * 4, start_x = x * 4;
56 int end_y = start_y + 4, end_x = start_x + 4;
57
58 for (int j = start_y; j < end_y; j++) {
59 for (int k = start_x; k < end_x; k++) {
60 if (mask & 0x8000) {
61 if (j >= avctx->height || k >= avctx->width) {
62 mask = mask << 1;
63 continue;
64 }
65 AV_WB24(&frame->data[0][frame->linesize[0] * (h - j) + 3 * k], color);
66 pixels_overwritten ++;
67 }
68 mask = mask << 1;
69 }
70 }
71 }
72 return pixels_overwritten;
73 }
74
75 static int fill_tileX(AVCodecContext *avctx, int tile_width, int tile_height,
76 int color, AVFrame *frame)
77 {
78 ARBCContext *s = avctx->priv_data;
79 GetByteContext *gb = &s->gb;
80 const int step_h = tile_height / 4;
81 const int step_w = tile_width / 4;
82 int nb_tiles = bytestream2_get_le16(gb);
83 int h = avctx->height - 1;
84 int pixels_overwritten = 0;
85
86 if ((avctx->width / tile_width + 1) * (avctx->height / tile_height + 1) < nb_tiles)
87 return 0;
88
89 for (int i = 0; i < nb_tiles; i++) {
90 int y = bytestream2_get_byte(gb);
91 int x = bytestream2_get_byte(gb);
92 uint16_t mask = bytestream2_get_le16(gb);
93 int start_y = y * tile_height, start_x = x * tile_width;
94 int end_y = start_y + tile_height, end_x = start_x + tile_width;
95
96 if (start_x >= avctx->width || start_y >= avctx->height)
97 continue;
98
99 for (int j = start_y; j < end_y; j += step_h) {
100 for (int k = start_x; k < end_x; k += step_w) {
101 if (mask & 0x8000U) {
102 for (int m = 0; m < step_h; m++) {
103 for (int n = 0; n < step_w; n++) {
104 if (j + m >= avctx->height || k + n >= avctx->width)
105 continue;
106 AV_WB24(&frame->data[0][frame->linesize[0] * (h - (j + m)) + 3 * (k + n)], color);
107 }
108 }
109 pixels_overwritten += FFMIN(step_h, avctx->height - j) * FFMIN(step_w, avctx->width - k);
110 }
111 mask = mask << 1;
112 }
113 }
114 }
115 return pixels_overwritten;
116 }
117
118 static int decode_frame(AVCodecContext *avctx, void *data,
119 int *got_frame, AVPacket *avpkt)
120 {
121 ARBCContext *s = avctx->priv_data;
122 AVFrame *frame = data;
123 int ret, nb_segments;
124 int prev_pixels = avctx->width * avctx->height;
125
126 if (avpkt->size < 10)
127 return AVERROR_INVALIDDATA;
128
129 bytestream2_init(&s->gb, avpkt->data, avpkt->size);
130 bytestream2_skip(&s->gb, 8);
131 nb_segments = bytestream2_get_le16(&s->gb);
132 if (nb_segments == 0)
133 return avpkt->size;
134
135 if (7 * nb_segments > bytestream2_get_bytes_left(&s->gb))
136 return AVERROR_INVALIDDATA;
137
138 if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
139 return ret;
140
141 if (s->prev_frame->data[0]) {
142 ret = av_frame_copy(frame, s->prev_frame);
143 if (ret < 0)
144 return ret;
145 }
146
147 for (int i = 0; i < nb_segments; i++) {
148 int resolution_flag;
149 int fill;
150
151 if (bytestream2_get_bytes_left(&s->gb) <= 0)
152 return AVERROR_INVALIDDATA;
153
154 fill = bytestream2_get_byte(&s->gb) << 16;
155 bytestream2_skip(&s->gb, 1);
156 fill |= bytestream2_get_byte(&s->gb) << 8;
157 bytestream2_skip(&s->gb, 1);
158 fill |= bytestream2_get_byte(&s->gb) << 0;
159 bytestream2_skip(&s->gb, 1);
160 resolution_flag = bytestream2_get_byte(&s->gb);
161
162 if (resolution_flag & 0x10)
163 prev_pixels -= fill_tileX(avctx, 1024, 1024, fill, frame);
164 if (resolution_flag & 0x08)
165 prev_pixels -= fill_tileX(avctx, 256, 256, fill, frame);
166 if (resolution_flag & 0x04)
167 prev_pixels -= fill_tileX(avctx, 64, 64, fill, frame);
168 if (resolution_flag & 0x02)
169 prev_pixels -= fill_tileX(avctx, 16, 16, fill, frame);
170 if (resolution_flag & 0x01)
171 prev_pixels -= fill_tile4(avctx, fill, frame);
172 }
173
174 av_frame_unref(s->prev_frame);
175 if ((ret = av_frame_ref(s->prev_frame, frame)) < 0)
176 return ret;
177
178 frame->pict_type = prev_pixels <= 0 ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
179 frame->key_frame = prev_pixels <= 0;
180 *got_frame = 1;
181
182 return avpkt->size;
183 }
184
185 static av_cold int decode_init(AVCodecContext *avctx)
186 {
187 ARBCContext *s = avctx->priv_data;
188
189 avctx->pix_fmt = AV_PIX_FMT_RGB24;
190
191 s->prev_frame = av_frame_alloc();
192 if (!s->prev_frame)
193 return AVERROR(ENOMEM);
194
195 return 0;
196 }
197
198 static void decode_flush(AVCodecContext *avctx)
199 {
200 ARBCContext *s = avctx->priv_data;
201
202 av_frame_unref(s->prev_frame);
203 }
204
205 static av_cold int decode_close(AVCodecContext *avctx)
206 {
207 ARBCContext *s = avctx->priv_data;
208
209 av_frame_free(&s->prev_frame);
210
211 return 0;
212 }
213
214 const AVCodec ff_arbc_decoder = {
215 .name = "arbc",
216 .long_name = NULL_IF_CONFIG_SMALL("Gryphon's Anim Compressor"),
217 .type = AVMEDIA_TYPE_VIDEO,
218 .id = AV_CODEC_ID_ARBC,
219 .priv_data_size = sizeof(ARBCContext),
220 .init = decode_init,
221 .decode = decode_frame,
222 .flush = decode_flush,
223 .close = decode_close,
224 .capabilities = AV_CODEC_CAP_DR1,
225 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
226 };
227