FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/qoidec.c
Date: 2024-11-20 23:03:26
Exec Total Coverage
Lines: 50 59 84.7%
Functions: 1 1 100.0%
Branches: 24 34 70.6%
Line Branch Exec Source
1 /*
2 * QOI image format
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #include "avcodec.h"
22 #include "bytestream.h"
23 #include "codec_internal.h"
24 #include "decode.h"
25 #include "thread.h"
26 #include "qoi.h"
27
28 40 static int qoi_decode_frame(AVCodecContext *avctx, AVFrame *p,
29 int *got_frame, AVPacket *avpkt)
30 {
31 40 int width, height, channels, space, run = 0;
32 40 uint8_t index[64][4] = { 0 };
33 40 uint8_t px[4] = { 0, 0, 0, 255 };
34 GetByteContext gb;
35 uint8_t *dst;
36 uint64_t len;
37 int ret;
38
39
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 40 if (avpkt->size < 20)
40 ✗ return AVERROR_INVALIDDATA;
41
42 40 bytestream2_init(&gb, avpkt->data, avpkt->size);
43 40 bytestream2_skip(&gb, 4);
44 40 width = bytestream2_get_be32(&gb);
45 40 height = bytestream2_get_be32(&gb);
46 40 channels = bytestream2_get_byte(&gb);
47 40 space = bytestream2_get_byte(&gb);
48
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 40 switch (space) {
49 40 case 0: break;
50 ✗ case 1: avctx->color_trc = AVCOL_TRC_LINEAR; break;
51 ✗ default: return AVERROR_INVALIDDATA;
52 }
53
54
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 40 if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
55 ✗ return ret;
56
57
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 40 switch (channels) {
58 40 case 3: avctx->pix_fmt = AV_PIX_FMT_RGB24; break;
59 ✗ case 4: avctx->pix_fmt = AV_PIX_FMT_RGBA; break;
60 ✗ default: return AVERROR_INVALIDDATA;
61 }
62
63
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 40 if (avctx->skip_frame >= AVDISCARD_ALL)
64 2 return avpkt->size;
65
66
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 38 if ((ret = ff_thread_get_buffer(avctx, p, 0)) < 0)
67 ✗ return ret;
68
69 38 dst = p->data[0];
70 38 len = width * height * channels;
71
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 3852326 for (int n = 0, off_x = 0; n < len; n += channels, off_x++) {
72
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 3852288 if (off_x >= width) {
73 10906 off_x = 0;
74 10906 dst += p->linesize[0];
75 }
76
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 3852288 if (run > 0) {
77 4 run--;
78
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 3852284 } else if (bytestream2_get_bytes_left(&gb) > 4) {
79 3852284 int chunk = bytestream2_get_byteu(&gb);
80
81
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 3852284 if (chunk == QOI_OP_RGB) {
82 2007173 bytestream2_get_bufferu(&gb, px, 3);
83
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 1845111 } else if (chunk == QOI_OP_RGBA) {
84 ✗ bytestream2_get_bufferu(&gb, px, 4);
85
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 1845111 } else if ((chunk & QOI_MASK_2) == QOI_OP_INDEX) {
86 12925 memcpy(px, index[chunk], 4);
87
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 1832186 } else if ((chunk & QOI_MASK_2) == QOI_OP_DIFF) {
88 19701 px[0] += ((chunk >> 4) & 0x03) - 2;
89 19701 px[1] += ((chunk >> 2) & 0x03) - 2;
90 19701 px[2] += ( chunk & 0x03) - 2;
91
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 1812485 } else if ((chunk & QOI_MASK_2) == QOI_OP_LUMA) {
92 1802436 int b2 = bytestream2_get_byteu(&gb);
93 1802436 int vg = (chunk & 0x3f) - 32;
94 1802436 px[0] += vg - 8 + ((b2 >> 4) & 0x0f);
95 1802436 px[1] += vg;
96 1802436 px[2] += vg - 8 + (b2 & 0x0f);
97
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 10049 } else if ((chunk & QOI_MASK_2) == QOI_OP_RUN) {
98 10049 run = chunk & 0x3f;
99 }
100
101 3852284 memcpy(index[QOI_COLOR_HASH(px) & 63], px, 4);
102 } else {
103 ✗ break;
104 }
105
106 3852288 memcpy(&dst[off_x * channels], px, channels);
107 }
108
109 38 *got_frame = 1;
110
111 38 return avpkt->size;
112 }
113
114 const FFCodec ff_qoi_decoder = {
115 .p.name = "qoi",
116 CODEC_LONG_NAME("QOI (Quite OK Image format) image"),
117 .p.type = AVMEDIA_TYPE_VIDEO,
118 .p.id = AV_CODEC_ID_QOI,
119 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
120 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
121 FF_CODEC_DECODE_CB(qoi_decode_frame),
122 };
123