FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/vbndec.c
Date: 2026-01-16 07:34:38
Exec Total Coverage
Lines: 68 90 75.6%
Functions: 3 3 100.0%
Branches: 31 50 62.0%
Line Branch Exec Source
1 /*
2 * Vizrt Binary Image decoder
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 /**
22 * @file
23 * Vizrt Binary Image decoder
24 */
25
26 #include "avcodec.h"
27 #include "bytestream.h"
28 #include "codec_internal.h"
29 #include "decode.h"
30 #include "texturedsp.h"
31 #include "vbn.h"
32 #include "libavutil/imgutils.h"
33 #include "libavutil/mem.h"
34
35 typedef struct VBNContext {
36 TextureDSPContext texdsp;
37 TextureDSPThreadContext dec;
38 } VBNContext;
39
40 8 static av_cold int vbn_init(AVCodecContext *avctx)
41 {
42 8 VBNContext *ctx = avctx->priv_data;
43 8 ff_texturedsp_init(&ctx->texdsp);
44 8 return 0;
45 }
46
47 8 static int decompress(AVCodecContext *avctx, GetByteContext *gb,
48 int compression, uint8_t **outbuf)
49 {
50
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 8 if (compression == VBN_COMPRESSION_NONE) // outbuf is left NULL because gb->buf can be used directly
51 8 return bytestream2_get_bytes_left(gb);
52
53 ✗ av_log(avctx, AV_LOG_ERROR, "Unsupported VBN compression: 0x%08x\n", compression);
54 ✗ return AVERROR_PATCHWELCOME;
55 }
56
57 8 static int vbn_decode_frame(AVCodecContext *avctx,
58 AVFrame *frame, int *got_frame,
59 AVPacket *avpkt)
60 {
61 8 VBNContext *ctx = avctx->priv_data;
62 8 GetByteContext gb0, *const gb = &gb0;
63 8 uint8_t *image_buf = NULL;
64 int image_len;
65 int width, height, components, format, compression, pix_fmt, linesize, data_size;
66 int ret;
67
68 8 bytestream2_init(gb, avpkt->data, avpkt->size);
69
70
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 8 if (bytestream2_get_bytes_left(gb) < VBN_HEADER_SIZE) {
71 ✗ av_log(avctx, AV_LOG_ERROR, "VBN header truncated\n");
72 ✗ return AVERROR_INVALIDDATA;
73 }
74
75
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 16 if (bytestream2_get_le32u(gb) != VBN_MAGIC ||
76
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 16 bytestream2_get_le32u(gb) != VBN_MAJOR ||
77 8 bytestream2_get_le32u(gb) != VBN_MINOR) {
78 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid VBN header\n");
79 ✗ return AVERROR_INVALIDDATA;
80 }
81
82 8 width = bytestream2_get_le32u(gb);
83 8 height = bytestream2_get_le32u(gb);
84 8 components = bytestream2_get_le32u(gb);
85 8 format = bytestream2_get_le32u(gb);
86 8 pix_fmt = bytestream2_get_le32u(gb);
87 8 bytestream2_get_le32u(gb); // mipmaps
88 8 data_size = bytestream2_get_le32u(gb);
89 8 bytestream2_seek(gb, VBN_HEADER_SIZE, SEEK_SET);
90
91 8 compression = format & 0xffffff00;
92 8 format = format & 0xff;
93
94
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 8 if (data_size != bytestream2_get_bytes_left(gb)) {
95 ✗ av_log(avctx, AV_LOG_ERROR, "Truncated packet\n");
96 ✗ return AVERROR_INVALIDDATA;
97 }
98
99
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 8 if (pix_fmt != VBN_PIX_RGBA && pix_fmt != VBN_PIX_RGB) {
100 ✗ av_log(avctx, AV_LOG_ERROR, "Unsupported pixel format: 0x%08x\n", pix_fmt);
101 ✗ return AVERROR_PATCHWELCOME;
102 }
103
104 8 ret = ff_set_dimensions(avctx, width, height);
105
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 8 if (ret < 0)
106 ✗ return ret;
107
108
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 8 if (format == VBN_FORMAT_RAW) {
109
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 4 if (pix_fmt == VBN_PIX_RGB && components == 3) {
110 2 avctx->pix_fmt = AV_PIX_FMT_RGB24;
111 2 linesize = avctx->width * 3;
112
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 2 } else if (pix_fmt == VBN_PIX_RGBA && components == 4) {
113 2 avctx->pix_fmt = AV_PIX_FMT_RGBA;
114 2 linesize = avctx->width * 4;
115 } else {
116 ✗ av_log(avctx, AV_LOG_ERROR, "Unsupported number of components: %d\n", components);
117 ✗ return AVERROR_PATCHWELCOME;
118 }
119
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 4 } else if (format == VBN_FORMAT_DXT1 || format == VBN_FORMAT_DXT5) {
120
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 4 if (avctx->width % TEXTURE_BLOCK_W || avctx->height % TEXTURE_BLOCK_H) {
121 ✗ av_log(avctx, AV_LOG_ERROR, "DXTx compression only supports 4 pixel aligned resolutions\n");
122 ✗ return AVERROR_INVALIDDATA;
123 }
124
125 4 avctx->pix_fmt = AV_PIX_FMT_RGBA;
126
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 4 if (format == VBN_FORMAT_DXT1) {
127 2 ctx->dec.tex_funct = ctx->texdsp.dxt1_block;
128 2 ctx->dec.tex_ratio = 8;
129 2 linesize = avctx->coded_width / 2;
130 } else {
131 2 ctx->dec.tex_funct = ctx->texdsp.dxt5_block;
132 2 ctx->dec.tex_ratio = 16;
133 2 linesize = avctx->coded_width;
134 }
135 } else {
136 ✗ av_log(avctx, AV_LOG_ERROR, "Unsupported VBN format: 0x%02x\n", format);
137 ✗ return AVERROR_PATCHWELCOME;
138 }
139
140 8 image_len = decompress(avctx, gb, compression, &image_buf);
141
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 8 if (image_len < 0)
142 ✗ return image_len;
143
144
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 8 if (image_len < linesize * avctx->coded_height) {
145 ✗ av_log(avctx, AV_LOG_ERROR, "Insufficient data\n");
146 ✗ ret = AVERROR_INVALIDDATA;
147 ✗ goto out;
148 }
149
150 8 ret = ff_get_buffer(avctx, frame, 0);
151
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 8 if (ret < 0)
152 ✗ goto out;
153
154
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 8 if (format == VBN_FORMAT_RAW) {
155 4 uint8_t *flipped = frame->data[0] + frame->linesize[0] * (frame->height - 1);
156
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 4 av_image_copy_plane(flipped, -frame->linesize[0], image_buf ? image_buf : gb->buffer, linesize, linesize, frame->height);
157 } else {
158 4 ctx->dec.slice_count = av_clip(avctx->thread_count, 1, avctx->coded_height / TEXTURE_BLOCK_H);
159
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 4 ctx->dec.tex_data.in = image_buf ? image_buf : gb->buffer;
160 4 ctx->dec.raw_ratio = 16;
161 4 ctx->dec.frame_data.out = frame->data[0] + frame->linesize[0] * (frame->height - 1);
162 4 ctx->dec.stride = -frame->linesize[0];
163 4 ctx->dec.width = avctx->coded_width;
164 4 ctx->dec.height = avctx->coded_height;
165 4 ff_texturedsp_exec_decompress_threads(avctx, &ctx->dec);
166 }
167
168 8 *got_frame = 1;
169 8 ret = avpkt->size;
170
171 8 out:
172 8 av_freep(&image_buf);
173 8 return ret;
174 }
175
176 const FFCodec ff_vbn_decoder = {
177 .p.name = "vbn",
178 CODEC_LONG_NAME("Vizrt Binary Image"),
179 .p.type = AVMEDIA_TYPE_VIDEO,
180 .p.id = AV_CODEC_ID_VBN,
181 .init = vbn_init,
182 FF_CODEC_DECODE_CB(vbn_decode_frame),
183 .priv_data_size = sizeof(VBNContext),
184 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_SLICE_THREADS,
185 };
186