FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/8bps.c
Date: 2021-09-16 08:47:15
Exec Total Coverage
Lines: 54 77 70.1%
Branches: 22 32 68.8%

Line Branch Exec Source
1 /*
2 * Quicktime Planar RGB (8BPS) Video Decoder
3 * Copyright (C) 2003 Roberto Togni
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 * QT 8BPS Video Decoder by Roberto Togni
25 * For more information about the 8BPS format, visit:
26 * http://www.pcisys.net/~melanson/codecs/
27 *
28 * Supports: PAL8 (RGB 8bpp, paletted)
29 * : BGR24 (RGB 24bpp) (can also output it as RGB32)
30 * : RGB32 (RGB 32bpp, 4th plane is alpha)
31 */
32
33 #include <stdio.h>
34 #include <stdlib.h>
35 #include <string.h>
36
37 #include "libavutil/internal.h"
38 #include "libavutil/intreadwrite.h"
39 #include "avcodec.h"
40 #include "decode.h"
41 #include "internal.h"
42
43
44 static const enum AVPixelFormat pixfmt_rgb24[] = {
45 AV_PIX_FMT_BGR24, AV_PIX_FMT_0RGB32, AV_PIX_FMT_NONE };
46
47 typedef struct EightBpsContext {
48 AVCodecContext *avctx;
49
50 unsigned char planes;
51 unsigned char planemap[4];
52
53 uint32_t pal[256];
54 } EightBpsContext;
55
56 13 static int decode_frame(AVCodecContext *avctx, void *data,
57 int *got_frame, AVPacket *avpkt)
58 {
59 13 AVFrame *frame = data;
60 13 const uint8_t *buf = avpkt->data;
61 13 int buf_size = avpkt->size;
62 13 EightBpsContext * const c = avctx->priv_data;
63 13 const unsigned char *encoded = buf;
64 unsigned char *pixptr, *pixptr_end;
65 13 unsigned int height = avctx->height; // Real image height
66 unsigned int dlen, p, row;
67 const unsigned char *lp, *dp, *ep;
68 unsigned char count;
69 unsigned int px_inc;
70 13 unsigned int planes = c->planes;
71 13 unsigned char *planemap = c->planemap;
72 int ret;
73
74
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13 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
75 return ret;
76
77 13 ep = encoded + buf_size;
78
79 /* Set data pointer after line lengths */
80 13 dp = encoded + planes * (height << 1);
81
82 13 px_inc = planes + (avctx->pix_fmt == AV_PIX_FMT_0RGB32);
83
84
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25 for (p = 0; p < planes; p++) {
85 /* Lines length pointer for this plane */
86 13 lp = encoded + p * (height << 1);
87
88 /* Decode a plane */
89
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3051 for (row = 0; row < height; row++) {
90 3039 pixptr = frame->data[0] + row * frame->linesize[0] + planemap[p];
91 3039 pixptr_end = pixptr + frame->linesize[0];
92
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3039 if (ep - lp < row * 2 + 2)
93 return AVERROR_INVALIDDATA;
94 3039 dlen = av_be2ne16(*(const unsigned short *)(lp + row * 2));
95 /* Decode a row of this plane */
96
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79145 while (dlen > 0) {
97
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76107 if (ep - dp <= 1)
98 return AVERROR_INVALIDDATA;
99
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76107 if ((count = *dp++) <= 127) {
100 37173 count++;
101 37173 dlen -= count + 1;
102
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37173 if (pixptr_end - pixptr < count * px_inc)
103 break;
104
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37173 if (ep - dp < count)
105 1 return AVERROR_INVALIDDATA;
106
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934711 while (count--) {
107 897539 *pixptr = *dp++;
108 897539 pixptr += px_inc;
109 }
110 } else {
111 38934 count = 257 - count;
112
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38934 if (pixptr_end - pixptr < count * px_inc)
113 break;
114
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235280 while (count--) {
115 196346 *pixptr = *dp;
116 196346 pixptr += px_inc;
117 }
118 38934 dp++;
119 38934 dlen -= 2;
120 }
121 }
122 }
123 }
124
125
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12 if (avctx->bits_per_coded_sample <= 8) {
126 12 frame->palette_has_changed = ff_copy_palette(c->pal, avpkt, avctx);
127
128 12 memcpy (frame->data[1], c->pal, AVPALETTE_SIZE);
129 }
130
131 12 *got_frame = 1;
132
133 /* always report that the buffer was completely consumed */
134 12 return buf_size;
135 }
136
137 2 static av_cold int decode_init(AVCodecContext *avctx)
138 {
139 2 EightBpsContext * const c = avctx->priv_data;
140
141 2 c->avctx = avctx;
142
143
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2 switch (avctx->bits_per_coded_sample) {
144 2 case 8:
145 2 avctx->pix_fmt = AV_PIX_FMT_PAL8;
146 2 c->planes = 1;
147 2 c->planemap[0] = 0; // 1st plane is palette indexes
148 2 break;
149 case 24:
150 avctx->pix_fmt = ff_get_format(avctx, pixfmt_rgb24);
151 c->planes = 3;
152 c->planemap[0] = 2; // 1st plane is red
153 c->planemap[1] = 1; // 2nd plane is green
154 c->planemap[2] = 0; // 3rd plane is blue
155 break;
156 case 32:
157 avctx->pix_fmt = AV_PIX_FMT_RGB32;
158 c->planes = 4;
159 /* handle planemap setup later for decoding rgb24 data as rbg32 */
160 break;
161 default:
162 av_log(avctx, AV_LOG_ERROR, "Error: Unsupported color depth: %u.\n",
163 avctx->bits_per_coded_sample);
164 return AVERROR_INVALIDDATA;
165 }
166
167
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2 if (avctx->pix_fmt == AV_PIX_FMT_RGB32) {
168 c->planemap[0] = HAVE_BIGENDIAN ? 1 : 2; // 1st plane is red
169 c->planemap[1] = HAVE_BIGENDIAN ? 2 : 1; // 2nd plane is green
170 c->planemap[2] = HAVE_BIGENDIAN ? 3 : 0; // 3rd plane is blue
171 c->planemap[3] = HAVE_BIGENDIAN ? 0 : 3; // 4th plane is alpha
172 }
173 2 return 0;
174 }
175
176 const AVCodec ff_eightbps_decoder = {
177 .name = "8bps",
178 .long_name = NULL_IF_CONFIG_SMALL("QuickTime 8BPS video"),
179 .type = AVMEDIA_TYPE_VIDEO,
180 .id = AV_CODEC_ID_8BPS,
181 .priv_data_size = sizeof(EightBpsContext),
182 .init = decode_init,
183 .decode = decode_frame,
184 .capabilities = AV_CODEC_CAP_DR1,
185 };
186