FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/rtv1.c
Date: 2024-07-24 19:24:46
Exec Total Coverage
Lines: 0 65 0.0%
Functions: 0 3 0.0%
Branches: 0 48 0.0%

Line Branch Exec Source
1 /*
2 * RTV1 decoder
3 * Copyright (c) 2023 Paul B Mahol
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 <stdio.h>
23 #include <string.h>
24
25 #include "avcodec.h"
26 #include "bytestream.h"
27 #include "codec_internal.h"
28 #include "decode.h"
29 #include "texturedsp.h"
30 #include "thread.h"
31
32 static av_cold int decode_init(AVCodecContext *avctx)
33 {
34 TextureDSPContext *dsp = avctx->priv_data;
35 avctx->pix_fmt = AV_PIX_FMT_BGR0;
36 ff_texturedsp_init(dsp);
37 return 0;
38 }
39
40 static int decode_rtv1(GetByteContext *gb, uint8_t *dst, ptrdiff_t linesize,
41 int width, int height, int flag,
42 int (*dxt1_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block))
43 {
44 uint8_t block[8] = { 0 };
45 int run = 0;
46
47 for (int y = 0; y < height; y += 4) {
48 for (int x = 0; x < width * 4; x += 16) {
49 int mode = 0;
50
51 if (run && --run > 0) {
52 dxt1_block(dst + x, linesize, block);
53 } else {
54 int a, b;
55
56 if (bytestream2_get_bytes_left(gb) < 4)
57 return AVERROR_INVALIDDATA;
58
59 a = bytestream2_get_le16u(gb);
60 b = bytestream2_get_le16u(gb);
61 if (a == b && flag) {
62 AV_WL32(block + 4, 0);
63 } else if (a == 1 && b == 0xffff) {
64 mode = 1;
65 } else if (b && a == 0) {
66 run = b;
67 } else {
68 AV_WL16(block, a);
69 AV_WL16(block + 2, b);
70 AV_WL32(block + 4, bytestream2_get_le32(gb));
71 }
72 if (run && !mode) {
73 dxt1_block(dst + x, linesize, block);
74 } else if (!mode) {
75 AV_WL16(block, a);
76 AV_WL16(block + 2, b);
77 dxt1_block(dst + x, linesize, block);
78 } else {
79 if (bytestream2_get_bytes_left(gb) < 12 * 4)
80 return AVERROR_INVALIDDATA;
81
82 for (int by = 0; by < 4; by++) {
83 for (int bx = 0; bx < 4; bx++)
84 AV_WL32(dst + x + bx * 4 + by * linesize, bytestream2_get_le24u(gb));
85 }
86 }
87 }
88 }
89
90 dst += linesize * 4;
91 }
92
93 return 0;
94 }
95
96 static int decode_frame(AVCodecContext *avctx, AVFrame *p,
97 int *got_frame, AVPacket *avpkt)
98 {
99 int ret, width, height, flags;
100 TextureDSPContext *dsp = avctx->priv_data;
101 GetByteContext gb;
102 ptrdiff_t linesize;
103 uint8_t *dst;
104
105 if (avpkt->size < 22)
106 return AVERROR_INVALIDDATA;
107
108 bytestream2_init(&gb, avpkt->data, avpkt->size);
109
110 if (bytestream2_get_le32(&gb) != MKTAG('D','X','T','1'))
111 return AVERROR_INVALIDDATA;
112 flags = bytestream2_get_le32(&gb);
113
114 width = bytestream2_get_le32(&gb);
115 height = bytestream2_get_le32(&gb);
116 if (width > INT_MAX-4U || height > INT_MAX-4U)
117 return AVERROR_INVALIDDATA;
118 ret = ff_set_dimensions(avctx, FFALIGN(width, 4), FFALIGN(height, 4));
119 if (ret < 0)
120 return ret;
121
122 avctx->width = width;
123 avctx->height = height;
124
125 if ((ret = ff_thread_get_buffer(avctx, p, 0)) < 0)
126 return ret;
127
128 dst = p->data[0] + p->linesize[0] * (avctx->coded_height - 1);
129 linesize = -p->linesize[0];
130
131 ret = decode_rtv1(&gb, dst, linesize, width, height, flags, dsp->dxt1_block);
132 if (ret < 0)
133 return ret;
134
135 *got_frame = 1;
136
137 return avpkt->size;
138 }
139
140 const FFCodec ff_rtv1_decoder = {
141 .p.name = "rtv1",
142 CODEC_LONG_NAME("RTV1 (RivaTuner Video)"),
143 .p.type = AVMEDIA_TYPE_VIDEO,
144 .p.id = AV_CODEC_ID_RTV1,
145 .priv_data_size = sizeof(TextureDSPContext),
146 .init = decode_init,
147 FF_CODEC_DECODE_CB(decode_frame),
148 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
149 };
150