FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/aliaspixdec.c
Date: 2022-07-05 19:52:29
Exec Total Coverage
Lines: 40 53 75.5%
Branches: 22 32 68.8%

Line Branch Exec Source
1 /*
2 * Alias PIX image decoder
3 * Copyright (C) 2014 Vittorio Giovara <vittorio.giovara@gmail.com>
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 "libavutil/intreadwrite.h"
23
24 #include "avcodec.h"
25 #include "bytestream.h"
26 #include "codec_internal.h"
27 #include "internal.h"
28
29 #define ALIAS_HEADER_SIZE 10
30
31 8 static int decode_frame(AVCodecContext *avctx, AVFrame *f,
32 int *got_frame, AVPacket *avpkt)
33 {
34 GetByteContext gb;
35 int width, height, ret, bits_pixel, pixel;
36 uint8_t *out_buf;
37 uint8_t count;
38 int x, y;
39
40 8 bytestream2_init(&gb, avpkt->data, avpkt->size);
41
42
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8 if (bytestream2_get_bytes_left(&gb) < ALIAS_HEADER_SIZE) {
43 av_log(avctx, AV_LOG_ERROR, "Header too small %d.\n", avpkt->size);
44 return AVERROR_INVALIDDATA;
45 }
46
47 8 width = bytestream2_get_be16u(&gb);
48 8 height = bytestream2_get_be16u(&gb);
49 8 bytestream2_skipu(&gb, 4); // obsolete X, Y offset
50 8 bits_pixel = bytestream2_get_be16u(&gb);
51
52
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8 if (bits_pixel == 24)
53 4 avctx->pix_fmt = AV_PIX_FMT_BGR24;
54
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4 else if (bits_pixel == 8)
55 4 avctx->pix_fmt = AV_PIX_FMT_GRAY8;
56 else {
57 av_log(avctx, AV_LOG_ERROR, "Invalid pixel format.\n");
58 return AVERROR_INVALIDDATA;
59 }
60
61 8 ret = ff_set_dimensions(avctx, width, height);
62
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8 if (ret < 0)
63 return ret;
64
65
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8 if (bytestream2_get_bytes_left(&gb) < width*height / 255)
66 return AVERROR_INVALIDDATA;
67
68 8 ret = ff_get_buffer(avctx, f, 0);
69
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8 if (ret < 0)
70 return ret;
71
72 8 f->pict_type = AV_PICTURE_TYPE_I;
73 8 f->key_frame = 1;
74
75 8 x = 0;
76 8 y = 1;
77 8 out_buf = f->data[0];
78
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120804 while (bytestream2_get_bytes_left(&gb) > 0) {
79 int i;
80
81 /* set buffer at the right position at every new line */
82
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120796 if (x == avctx->width) {
83 632 x = 0;
84 632 out_buf = f->data[0] + f->linesize[0] * y++;
85
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632 if (y > avctx->height) {
86 av_log(avctx, AV_LOG_ERROR,
87 "Ended frame decoding with %d bytes left.\n",
88 bytestream2_get_bytes_left(&gb));
89 return AVERROR_INVALIDDATA;
90 }
91 }
92
93 /* read packet and copy data */
94 120796 count = bytestream2_get_byteu(&gb);
95
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120796 if (!count || x + count > avctx->width) {
96 av_log(avctx, AV_LOG_ERROR, "Invalid run length %d.\n", count);
97 return AVERROR_INVALIDDATA;
98 }
99
100
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120796 if (avctx->pix_fmt == AV_PIX_FMT_BGR24) {
101 63080 pixel = bytestream2_get_be24(&gb);
102
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126596 for (i = 0; i < count; i++) {
103 63516 AV_WB24(out_buf, pixel);
104 63516 out_buf += 3;
105 }
106 } else { // AV_PIX_FMT_GRAY8
107 57716 pixel = bytestream2_get_byte(&gb);
108
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122192 for (i = 0; i < count; i++)
109 64476 *out_buf++ = pixel;
110 }
111
112 120796 x += i;
113 }
114
115
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8 if (x != width || y != height) {
116 av_log(avctx, AV_LOG_ERROR, "Picture stopped at %d,%d.\n", x, y);
117 return AVERROR_INVALIDDATA;
118 }
119
120 8 *got_frame = 1;
121 8 return avpkt->size;
122 }
123
124 const FFCodec ff_alias_pix_decoder = {
125 .p.name = "alias_pix",
126 .p.long_name = NULL_IF_CONFIG_SMALL("Alias/Wavefront PIX image"),
127 .p.type = AVMEDIA_TYPE_VIDEO,
128 .p.id = AV_CODEC_ID_ALIAS_PIX,
129 .p.capabilities = AV_CODEC_CAP_DR1,
130 FF_CODEC_DECODE_CB(decode_frame),
131 };
132