FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/imx.c
Date: 2025-10-09 16:39:38
Exec Total Coverage
Lines: 0 96 0.0%
Functions: 0 4 0.0%
Branches: 0 55 0.0%

Line Branch Exec Source
1 /*
2 * Copyright (c) 2021 Paul B Mahol
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 "libavutil/attributes.h"
22 #include "libavutil/common.h"
23 #include "avcodec.h"
24 #include "bytestream.h"
25 #include "codec_internal.h"
26 #include "decode.h"
27
28 typedef struct SimbiosisIMXContext {
29 AVFrame *frame;
30 uint32_t pal[256];
31 uint8_t history[32768];
32 int pos;
33 } SimbiosisIMXContext;
34
35 static av_cold int imx_decode_init(AVCodecContext *avctx)
36 {
37 SimbiosisIMXContext *imx = avctx->priv_data;
38
39 avctx->pix_fmt = AV_PIX_FMT_PAL8;
40 avctx->width = 320;
41 avctx->height = 160;
42
43 imx->frame = av_frame_alloc();
44 if (!imx->frame)
45 return AVERROR(ENOMEM);
46
47 return 0;
48 }
49
50 static int imx_decode_frame(AVCodecContext *avctx, AVFrame *rframe,
51 int *got_frame, AVPacket *avpkt)
52 {
53 SimbiosisIMXContext *imx = avctx->priv_data;
54 int ret, x, y;
55 AVFrame *frame = imx->frame;
56 GetByteContext gb;
57
58 if ((ret = ff_reget_buffer(avctx, frame, 0)) < 0)
59 return ret;
60
61 if (ff_copy_palette(imx->pal, avpkt, avctx)) {
62 frame->flags |= AV_FRAME_FLAG_KEY;
63 } else {
64 frame->flags &= ~AV_FRAME_FLAG_KEY;
65 }
66
67 bytestream2_init(&gb, avpkt->data, avpkt->size);
68
69 memcpy(frame->data[1], imx->pal, AVPALETTE_SIZE);
70
71 x = 0, y = 0;
72 while (bytestream2_get_bytes_left(&gb) > 0 &&
73 x < 320 && y < 160) {
74 int b = bytestream2_get_byte(&gb);
75 int len = b & 0x3f;
76 int op = b >> 6;
77 int fill;
78
79 switch (op) {
80 case 3:
81 len = len * 64 + bytestream2_get_byte(&gb);
82 case 0:
83 while (len > 0) {
84 x++;
85 len--;
86 if (x >= 320) {
87 x = 0;
88 y++;
89 }
90 if (y >= 160)
91 break;
92 }
93
94 frame->flags &= ~AV_FRAME_FLAG_KEY;
95 break;
96 case 1:
97 if (len == 0) {
98 int offset = bytestream2_get_le16(&gb);
99
100 if (offset < 0 || offset >= 32768)
101 return AVERROR_INVALIDDATA;
102
103 len = bytestream2_get_byte(&gb);
104 while (len > 0 && offset < 32768) {
105 frame->data[0][x + y * frame->linesize[0]] = imx->history[offset++];
106 x++;
107 len--;
108 if (x >= 320) {
109 x = 0;
110 y++;
111 }
112 if (y >= 160)
113 break;
114 }
115
116 frame->flags &= ~AV_FRAME_FLAG_KEY;
117 } else {
118 while (len > 0) {
119 fill = bytestream2_get_byte(&gb);
120 frame->data[0][x + y * frame->linesize[0]] = fill;
121 if (imx->pos < 32768)
122 imx->history[imx->pos++] = fill;
123 x++;
124 len--;
125 if (x >= 320) {
126 x = 0;
127 y++;
128 }
129 if (y >= 160)
130 break;
131 }
132 }
133 break;
134 case 2:
135 fill = bytestream2_get_byte(&gb);
136
137 while (len > 0) {
138 frame->data[0][x + y * frame->linesize[0]] = fill;
139 x++;
140 len--;
141 if (x >= 320) {
142 x = 0;
143 y++;
144 }
145 if (y >= 160)
146 break;
147 }
148 break;
149 }
150 }
151
152 frame->pict_type = (frame->flags & AV_FRAME_FLAG_KEY) ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
153
154 if ((ret = av_frame_ref(rframe, frame)) < 0)
155 return ret;
156
157 *got_frame = 1;
158
159 return avpkt->size;
160 }
161
162 static av_cold void imx_decode_flush(AVCodecContext *avctx)
163 {
164 SimbiosisIMXContext *imx = avctx->priv_data;
165
166 av_frame_unref(imx->frame);
167 imx->pos = 0;
168 memset(imx->pal, 0, sizeof(imx->pal));
169 memset(imx->history, 0, sizeof(imx->history));
170 }
171
172 static av_cold int imx_decode_close(AVCodecContext *avctx)
173 {
174 SimbiosisIMXContext *imx = avctx->priv_data;
175
176 av_frame_free(&imx->frame);
177
178 return 0;
179 }
180
181 const FFCodec ff_simbiosis_imx_decoder = {
182 .p.name = "simbiosis_imx",
183 CODEC_LONG_NAME("Simbiosis Interactive IMX Video"),
184 .p.type = AVMEDIA_TYPE_VIDEO,
185 .p.id = AV_CODEC_ID_SIMBIOSIS_IMX,
186 .priv_data_size = sizeof(SimbiosisIMXContext),
187 .init = imx_decode_init,
188 FF_CODEC_DECODE_CB(imx_decode_frame),
189 .close = imx_decode_close,
190 .flush = imx_decode_flush,
191 .p.capabilities = AV_CODEC_CAP_DR1,
192 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
193 };
194