FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/aasc.c
Date: 2021-09-26 18:22:30
Exec Total Coverage
Lines: 35 74 47.3%
Branches: 8 26 30.8%

Line Branch Exec Source
1 /*
2 * Autodesk RLE Decoder
3 * Copyright (C) 2005 The FFmpeg project
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 * Autodesk RLE Video Decoder by Konstantin Shishkov
25 */
26
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <string.h>
30
31 #include "avcodec.h"
32 #include "internal.h"
33 #include "msrledec.h"
34
35 typedef struct AascContext {
36 AVCodecContext *avctx;
37 GetByteContext gb;
38 AVFrame *frame;
39
40 uint32_t palette[AVPALETTE_COUNT];
41 int palette_size;
42 } AascContext;
43
44 2 static av_cold int aasc_decode_init(AVCodecContext *avctx)
45 {
46 2 AascContext *s = avctx->priv_data;
47 uint8_t *ptr;
48 int i;
49
50 2 s->avctx = avctx;
51
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2 switch (avctx->bits_per_coded_sample) {
52 case 8:
53 avctx->pix_fmt = AV_PIX_FMT_PAL8;
54
55 ptr = avctx->extradata;
56 s->palette_size = FFMIN(avctx->extradata_size, AVPALETTE_SIZE);
57 for (i = 0; i < s->palette_size / 4; i++) {
58 s->palette[i] = 0xFFU << 24 | AV_RL32(ptr);
59 ptr += 4;
60 }
61 break;
62 case 16:
63 avctx->pix_fmt = AV_PIX_FMT_RGB555LE;
64 break;
65 2 case 24:
66 2 avctx->pix_fmt = AV_PIX_FMT_BGR24;
67 2 break;
68 default:
69 av_log(avctx, AV_LOG_ERROR, "Unsupported bit depth: %d\n", avctx->bits_per_coded_sample);
70 return -1;
71 }
72
73 2 s->frame = av_frame_alloc();
74
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2 if (!s->frame)
75 return AVERROR(ENOMEM);
76
77 2 return 0;
78 }
79
80 24 static int aasc_decode_frame(AVCodecContext *avctx,
81 void *data, int *got_frame,
82 AVPacket *avpkt)
83 {
84 24 const uint8_t *buf = avpkt->data;
85 24 int buf_size = avpkt->size;
86 24 AascContext *s = avctx->priv_data;
87 int compr, i, stride, psize, ret;
88
89
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24 if (buf_size < 4) {
90 av_log(avctx, AV_LOG_ERROR, "frame too short\n");
91 return AVERROR_INVALIDDATA;
92 }
93
94
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24 if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
95 return ret;
96
97 24 compr = AV_RL32(buf);
98 24 buf += 4;
99 24 buf_size -= 4;
100 24 psize = avctx->bits_per_coded_sample / 8;
101
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24 switch (avctx->codec_tag) {
102 case MKTAG('A', 'A', 'S', '4'):
103 bytestream2_init(&s->gb, buf - 4, buf_size + 4);
104 ff_msrle_decode(avctx, s->frame, 8, &s->gb);
105 break;
106
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24 case MKTAG('A', 'A', 'S', 'C'):
107 switch (compr) {
108 case 0:
109 stride = (avctx->width * psize + psize) & ~psize;
110 if (buf_size < stride * avctx->height)
111 return AVERROR_INVALIDDATA;
112 for (i = avctx->height - 1; i >= 0; i--) {
113 memcpy(s->frame->data[0] + i * s->frame->linesize[0], buf, avctx->width * psize);
114 buf += stride;
115 buf_size -= stride;
116 }
117 break;
118 24 case 1:
119 24 bytestream2_init(&s->gb, buf, buf_size);
120 24 ff_msrle_decode(avctx, s->frame, 8, &s->gb);
121 24 break;
122 default:
123 av_log(avctx, AV_LOG_ERROR, "Unknown compression type %d\n", compr);
124 return AVERROR_INVALIDDATA;
125 }
126 24 break;
127 default:
128 av_log(avctx, AV_LOG_ERROR, "Unknown FourCC: %X\n", avctx->codec_tag);
129 return -1;
130 }
131
132
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24 if (avctx->pix_fmt == AV_PIX_FMT_PAL8)
133 memcpy(s->frame->data[1], s->palette, s->palette_size);
134
135 24 *got_frame = 1;
136
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24 if ((ret = av_frame_ref(data, s->frame)) < 0)
137 return ret;
138
139 /* report that the buffer was completely consumed */
140 24 return avpkt->size;
141 }
142
143 2 static av_cold int aasc_decode_end(AVCodecContext *avctx)
144 {
145 2 AascContext *s = avctx->priv_data;
146
147 2 av_frame_free(&s->frame);
148
149 2 return 0;
150 }
151
152 const AVCodec ff_aasc_decoder = {
153 .name = "aasc",
154 .long_name = NULL_IF_CONFIG_SMALL("Autodesk RLE"),
155 .type = AVMEDIA_TYPE_VIDEO,
156 .id = AV_CODEC_ID_AASC,
157 .priv_data_size = sizeof(AascContext),
158 .init = aasc_decode_init,
159 .close = aasc_decode_end,
160 .decode = aasc_decode_frame,
161 .capabilities = AV_CODEC_CAP_DR1,
162 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
163 };
164