FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/vbndec.c
Date: 2022-05-23 03:24:52
Exec Total Coverage
Lines: 68 90 75.6%
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 "internal.h"
30 #include "texturedsp.h"
31 #include "vbn.h"
32 #include "libavutil/imgutils.h"
33
34 typedef struct VBNContext {
35 TextureDSPContext texdsp;
36 TextureDSPThreadContext dec;
37 } VBNContext;
38
39 8 static av_cold int vbn_init(AVCodecContext *avctx)
40 {
41 8 VBNContext *ctx = avctx->priv_data;
42 8 ff_texturedsp_init(&ctx->texdsp);
43 8 return 0;
44 }
45
46 8 static int decompress(AVCodecContext *avctx, GetByteContext *gb,
47 int compression, uint8_t **outbuf)
48 {
49
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8 if (compression == VBN_COMPRESSION_NONE) // outbuf is left NULL because gb->buf can be used directly
50 8 return bytestream2_get_bytes_left(gb);
51
52 av_log(avctx, AV_LOG_ERROR, "Unsupported VBN compression: 0x%08x\n", compression);
53 return AVERROR_PATCHWELCOME;
54 }
55
56 8 static int vbn_decode_frame(AVCodecContext *avctx,
57 AVFrame *frame, int *got_frame,
58 AVPacket *avpkt)
59 {
60 8 VBNContext *ctx = avctx->priv_data;
61 8 GetByteContext gb0, *const gb = &gb0;
62 8 uint8_t *image_buf = NULL;
63 int image_len;
64 int width, height, components, format, compression, pix_fmt, linesize, data_size;
65 int ret;
66
67 8 bytestream2_init(gb, avpkt->data, avpkt->size);
68
69
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8 if (bytestream2_get_bytes_left(gb) < VBN_HEADER_SIZE) {
70 av_log(avctx, AV_LOG_ERROR, "VBN header truncated\n");
71 return AVERROR_INVALIDDATA;
72 }
73
74
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16 if (bytestream2_get_le32u(gb) != VBN_MAGIC ||
75
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16 bytestream2_get_le32u(gb) != VBN_MAJOR ||
76 8 bytestream2_get_le32u(gb) != VBN_MINOR) {
77 av_log(avctx, AV_LOG_ERROR, "Invalid VBN header\n");
78 return AVERROR_INVALIDDATA;
79 }
80
81 8 width = bytestream2_get_le32u(gb);
82 8 height = bytestream2_get_le32u(gb);
83 8 components = bytestream2_get_le32u(gb);
84 8 format = bytestream2_get_le32u(gb);
85 8 pix_fmt = bytestream2_get_le32u(gb);
86 8 bytestream2_get_le32u(gb); // mipmaps
87 8 data_size = bytestream2_get_le32u(gb);
88 8 bytestream2_seek(gb, VBN_HEADER_SIZE, SEEK_SET);
89
90 8 compression = format & 0xffffff00;
91 8 format = format & 0xff;
92
93
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8 if (data_size != bytestream2_get_bytes_left(gb)) {
94 av_log(avctx, AV_LOG_ERROR, "Truncated packet\n");
95 return AVERROR_INVALIDDATA;
96 }
97
98
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8 if (pix_fmt != VBN_PIX_RGBA && pix_fmt != VBN_PIX_RGB) {
99 av_log(avctx, AV_LOG_ERROR, "Unsupported pixel format: 0x%08x\n", pix_fmt);
100 return AVERROR_PATCHWELCOME;
101 }
102
103 8 ret = ff_set_dimensions(avctx, width, height);
104
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8 if (ret < 0)
105 return ret;
106
107
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8 if (format == VBN_FORMAT_RAW) {
108
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4 if (pix_fmt == VBN_PIX_RGB && components == 3) {
109 2 avctx->pix_fmt = AV_PIX_FMT_RGB24;
110 2 linesize = avctx->width * 3;
111
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2 } else if (pix_fmt == VBN_PIX_RGBA && components == 4) {
112 2 avctx->pix_fmt = AV_PIX_FMT_RGBA;
113 2 linesize = avctx->width * 4;
114 } else {
115 av_log(avctx, AV_LOG_ERROR, "Unsupported number of components: %d\n", components);
116 return AVERROR_PATCHWELCOME;
117 }
118
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4 } else if (format == VBN_FORMAT_DXT1 || format == VBN_FORMAT_DXT5) {
119
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4 if (avctx->width % TEXTURE_BLOCK_W || avctx->height % TEXTURE_BLOCK_H) {
120 av_log(avctx, AV_LOG_ERROR, "DXTx compression only supports 4 pixel aligned resolutions\n");
121 return AVERROR_INVALIDDATA;
122 }
123
124 4 avctx->pix_fmt = AV_PIX_FMT_RGBA;
125
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4 if (format == VBN_FORMAT_DXT1) {
126 2 ctx->dec.tex_funct = ctx->texdsp.dxt1_block;
127 2 ctx->dec.tex_ratio = 8;
128 2 linesize = avctx->coded_width / 2;
129 } else {
130 2 ctx->dec.tex_funct = ctx->texdsp.dxt5_block;
131 2 ctx->dec.tex_ratio = 16;
132 2 linesize = avctx->coded_width;
133 }
134 } else {
135 av_log(avctx, AV_LOG_ERROR, "Unsupported VBN format: 0x%02x\n", format);
136 return AVERROR_PATCHWELCOME;
137 }
138
139 8 image_len = decompress(avctx, gb, compression, &image_buf);
140
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8 if (image_len < 0)
141 return image_len;
142
143
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8 if (image_len < linesize * avctx->coded_height) {
144 av_log(avctx, AV_LOG_ERROR, "Insufficent data\n");
145 ret = AVERROR_INVALIDDATA;
146 goto out;
147 }
148
149 8 ret = ff_get_buffer(avctx, frame, 0);
150
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8 if (ret < 0)
151 goto out;
152
153 8 frame->pict_type = AV_PICTURE_TYPE_I;
154 8 frame->key_frame = 1;
155
156
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8 if (format == VBN_FORMAT_RAW) {
157 4 uint8_t *flipped = frame->data[0] + frame->linesize[0] * (frame->height - 1);
158
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4 av_image_copy_plane(flipped, -frame->linesize[0], image_buf ? image_buf : gb->buffer, linesize, linesize, frame->height);
159 } else {
160 4 ctx->dec.slice_count = av_clip(avctx->thread_count, 1, avctx->coded_height / TEXTURE_BLOCK_H);
161
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4 ctx->dec.tex_data.in = image_buf ? image_buf : gb->buffer;
162 4 ctx->dec.raw_ratio = 16;
163 4 ctx->dec.frame_data.out = frame->data[0] + frame->linesize[0] * (frame->height - 1);
164 4 ctx->dec.stride = -frame->linesize[0];
165 4 avctx->execute2(avctx, ff_texturedsp_decompress_thread, &ctx->dec, NULL, ctx->dec.slice_count);
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 .p.long_name = NULL_IF_CONFIG_SMALL("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 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE
186 };
187