Directory: | ../../../ffmpeg/ |
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File: | src/libavcodec/aasc.c |
Date: | 2022-07-04 19:11:22 |
Exec | Total | Coverage | |
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Lines: | 35 | 74 | 47.3% |
Branches: | 8 | 26 | 30.8% |
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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 "codec_internal.h" | ||
33 | #include "internal.h" | ||
34 | #include "msrledec.h" | ||
35 | |||
36 | typedef struct AascContext { | ||
37 | AVCodecContext *avctx; | ||
38 | GetByteContext gb; | ||
39 | AVFrame *frame; | ||
40 | |||
41 | uint32_t palette[AVPALETTE_COUNT]; | ||
42 | int palette_size; | ||
43 | } AascContext; | ||
44 | |||
45 | 2 | static av_cold int aasc_decode_init(AVCodecContext *avctx) | |
46 | { | ||
47 | 2 | AascContext *s = avctx->priv_data; | |
48 | uint8_t *ptr; | ||
49 | int i; | ||
50 | |||
51 | 2 | s->avctx = avctx; | |
52 |
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2 | switch (avctx->bits_per_coded_sample) { |
53 | ✗ | case 8: | |
54 | ✗ | avctx->pix_fmt = AV_PIX_FMT_PAL8; | |
55 | |||
56 | ✗ | ptr = avctx->extradata; | |
57 | ✗ | s->palette_size = FFMIN(avctx->extradata_size, AVPALETTE_SIZE); | |
58 | ✗ | for (i = 0; i < s->palette_size / 4; i++) { | |
59 | ✗ | s->palette[i] = 0xFFU << 24 | AV_RL32(ptr); | |
60 | ✗ | ptr += 4; | |
61 | } | ||
62 | ✗ | break; | |
63 | ✗ | case 16: | |
64 | ✗ | avctx->pix_fmt = AV_PIX_FMT_RGB555LE; | |
65 | ✗ | break; | |
66 | 2 | case 24: | |
67 | 2 | avctx->pix_fmt = AV_PIX_FMT_BGR24; | |
68 | 2 | break; | |
69 | ✗ | default: | |
70 | ✗ | av_log(avctx, AV_LOG_ERROR, "Unsupported bit depth: %d\n", avctx->bits_per_coded_sample); | |
71 | ✗ | return -1; | |
72 | } | ||
73 | |||
74 | 2 | s->frame = av_frame_alloc(); | |
75 |
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2 | if (!s->frame) |
76 | ✗ | return AVERROR(ENOMEM); | |
77 | |||
78 | 2 | return 0; | |
79 | } | ||
80 | |||
81 | 24 | static int aasc_decode_frame(AVCodecContext *avctx, AVFrame *rframe, | |
82 | int *got_frame, 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(rframe, 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 FFCodec ff_aasc_decoder = { | ||
153 | .p.name = "aasc", | ||
154 | .p.long_name = NULL_IF_CONFIG_SMALL("Autodesk RLE"), | ||
155 | .p.type = AVMEDIA_TYPE_VIDEO, | ||
156 | .p.id = AV_CODEC_ID_AASC, | ||
157 | .priv_data_size = sizeof(AascContext), | ||
158 | .init = aasc_decode_init, | ||
159 | .close = aasc_decode_end, | ||
160 | FF_CODEC_DECODE_CB(aasc_decode_frame), | ||
161 | .p.capabilities = AV_CODEC_CAP_DR1, | ||
162 | .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, | ||
163 | }; | ||
164 |