FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/sgienc.c
Date: 2025-07-28 20:30:09
Exec Total Coverage
Lines: 77 136 56.6%
Functions: 3 3 100.0%
Branches: 30 64 46.9%
Line Branch Exec Source
1 /*
2 * SGI image encoder
3 * Todd Kirby <doubleshot@pacbell.net>
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 "libavutil/mem.h"
23 #include "libavutil/opt.h"
24
25 #include "avcodec.h"
26 #include "bytestream.h"
27 #include "codec_internal.h"
28 #include "encode.h"
29 #include "sgi.h"
30 #include "rle.h"
31
32 #define SGI_SINGLE_CHAN 2
33 #define SGI_MULTI_CHAN 3
34
35 typedef struct SgiContext {
36 AVClass *class;
37
38 int rle;
39 } SgiContext;
40
41 1 static av_cold int encode_init(AVCodecContext *avctx)
42 {
43
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 1 if (avctx->width > 65535 || avctx->height > 65535) {
44 ✗ av_log(avctx, AV_LOG_ERROR, "Unsupported resolution %dx%d. "
45 "SGI does not support resolutions above 65535x65535\n",
46 avctx->width, avctx->height);
47 ✗ return AVERROR_INVALIDDATA;
48 }
49
50 1 return 0;
51 }
52
53 11232 static int sgi_rle_encode(PutByteContext *pbc, const uint8_t *src,
54 int w, int bpp)
55 {
56 11232 int val, count, x, start = bytestream2_tell_p(pbc);
57 void (*bytestream2_put)(PutByteContext *, unsigned int);
58
59
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 11232 if (bpp == 1)
60 11232 bytestream2_put = bytestream2_put_byte;
61 else
62 ✗ bytestream2_put = bytestream2_put_be16;
63
64
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 97313 for (x = 0; x < w; x += count) {
65 /* see if we can encode the next set of pixels with RLE */
66 86081 count = ff_rle_count_pixels(src, w - x, bpp, 1);
67
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 86081 if (count > 1) {
68
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 34170 if (bytestream2_get_bytes_left_p(pbc) < bpp * 2)
69 ✗ return AVERROR_INVALIDDATA;
70
71
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 34170 val = bpp == 1 ? *src : AV_RB16(src);
72 34170 bytestream2_put(pbc, count);
73 34170 bytestream2_put(pbc, val);
74 } else {
75 int i;
76 /* fall back on uncompressed */
77 51911 count = ff_rle_count_pixels(src, w - x, bpp, 0);
78
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 51911 if (bytestream2_get_bytes_left_p(pbc) < bpp * (count + 1))
79 ✗ return AVERROR_INVALIDDATA;
80
81 51911 bytestream2_put(pbc, count + 0x80);
82
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 3834780 for (i = 0; i < count; i++) {
83
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 3782869 val = bpp == 1 ? src[i] : AV_RB16(src + i * bpp);
84 3782869 bytestream2_put(pbc, val);
85 }
86 }
87
88 86081 src += count * bpp;
89 }
90
91 11232 return bytestream2_tell_p(pbc) - start;
92 }
93
94 13 static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
95 const AVFrame *frame, int *got_packet)
96 {
97 13 SgiContext *s = avctx->priv_data;
98 13 const AVFrame * const p = frame;
99 PutByteContext pbc;
100 uint8_t *encode_buf;
101 int x, y, z, length, tablesize, ret, i;
102 unsigned int width, height, depth, dimension;
103 unsigned int bytes_per_channel, pixmax, put_be;
104
105 13 width = avctx->width;
106 13 height = avctx->height;
107 13 bytes_per_channel = 1;
108 13 pixmax = 0xFF;
109 13 put_be = HAVE_BIGENDIAN;
110
111
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 13 switch (avctx->pix_fmt) {
112 ✗ case AV_PIX_FMT_GRAY8:
113 ✗ dimension = SGI_SINGLE_CHAN;
114 ✗ depth = SGI_GRAYSCALE;
115 ✗ break;
116 13 case AV_PIX_FMT_RGB24:
117 13 dimension = SGI_MULTI_CHAN;
118 13 depth = SGI_RGB;
119 13 break;
120 ✗ case AV_PIX_FMT_RGBA:
121 ✗ dimension = SGI_MULTI_CHAN;
122 ✗ depth = SGI_RGBA;
123 ✗ break;
124 ✗ case AV_PIX_FMT_GRAY16LE:
125 ✗ put_be = !HAVE_BIGENDIAN;
126 ✗ case AV_PIX_FMT_GRAY16BE:
127 ✗ bytes_per_channel = 2;
128 ✗ pixmax = 0xFFFF;
129 ✗ dimension = SGI_SINGLE_CHAN;
130 ✗ depth = SGI_GRAYSCALE;
131 ✗ break;
132 ✗ case AV_PIX_FMT_RGB48LE:
133 ✗ put_be = !HAVE_BIGENDIAN;
134 ✗ case AV_PIX_FMT_RGB48BE:
135 ✗ bytes_per_channel = 2;
136 ✗ pixmax = 0xFFFF;
137 ✗ dimension = SGI_MULTI_CHAN;
138 ✗ depth = SGI_RGB;
139 ✗ break;
140 ✗ case AV_PIX_FMT_RGBA64LE:
141 ✗ put_be = !HAVE_BIGENDIAN;
142 ✗ case AV_PIX_FMT_RGBA64BE:
143 ✗ bytes_per_channel = 2;
144 ✗ pixmax = 0xFFFF;
145 ✗ dimension = SGI_MULTI_CHAN;
146 ✗ depth = SGI_RGBA;
147 ✗ break;
148 ✗ default:
149 ✗ return AVERROR_INVALIDDATA;
150 }
151
152 13 tablesize = depth * height * 4;
153 13 length = SGI_HEADER_SIZE;
154
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 13 if (!s->rle)
155 ✗ length += depth * height * width;
156 else // assume sgi_rle_encode() produces at most 2x size of input
157 13 length += tablesize * 2 + depth * height * (2 * width + 1);
158
159
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 13 if ((ret = ff_alloc_packet(avctx, pkt, bytes_per_channel * length)) < 0)
160 ✗ return ret;
161
162 13 bytestream2_init_writer(&pbc, pkt->data, pkt->size);
163
164 /* Encode header. */
165 13 bytestream2_put_be16(&pbc, SGI_MAGIC);
166 13 bytestream2_put_byte(&pbc, s->rle); /* RLE 1 - VERBATIM 0 */
167 13 bytestream2_put_byte(&pbc, bytes_per_channel);
168 13 bytestream2_put_be16(&pbc, dimension);
169 13 bytestream2_put_be16(&pbc, width);
170 13 bytestream2_put_be16(&pbc, height);
171 13 bytestream2_put_be16(&pbc, depth);
172
173 13 bytestream2_put_be32(&pbc, 0L); /* pixmin */
174 13 bytestream2_put_be32(&pbc, pixmax);
175 13 bytestream2_put_be32(&pbc, 0L); /* dummy */
176
177 /* name */
178
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 1053 for (i = 0; i < 80; i++)
179 1040 bytestream2_put_byte(&pbc, 0L);
180
181 /* colormap */
182 13 bytestream2_put_be32(&pbc, 0L);
183
184 /* The rest of the 512 byte header is unused. */
185
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 5265 for (i = 0; i < 404; i++)
186 5252 bytestream2_put_byte(&pbc, 0L);
187
188
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 13 if (s->rle) {
189 PutByteContext taboff_pcb, tablen_pcb;
190
191 /* Skip RLE offset table. */
192 13 bytestream2_init_writer(&taboff_pcb, pbc.buffer, tablesize);
193 13 bytestream2_skip_p(&pbc, tablesize);
194
195 /* Skip RLE length table. */
196 13 bytestream2_init_writer(&tablen_pcb, pbc.buffer, tablesize);
197 13 bytestream2_skip_p(&pbc, tablesize);
198
199 /* Make an intermediate consecutive buffer. */
200
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 13 if (!(encode_buf = av_malloc(width * bytes_per_channel)))
201 ✗ return AVERROR(ENOMEM);
202
203
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 52 for (z = 0; z < depth; z++) {
204 39 const uint8_t *in_buf = p->data[0] + p->linesize[0] * (height - 1) + z * bytes_per_channel;
205
206
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 11271 for (y = 0; y < height; y++) {
207 11232 bytestream2_put_be32(&taboff_pcb, bytestream2_tell_p(&pbc));
208
209
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 3964896 for (x = 0; x < width * bytes_per_channel; x += bytes_per_channel)
210
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 3953664 if (bytes_per_channel == 1) {
211 3953664 encode_buf[x] = in_buf[depth * x];
212 ✗ } else if (HAVE_BIGENDIAN ^ put_be) {
213 ✗ encode_buf[x + 1] = in_buf[depth * x];
214 ✗ encode_buf[x] = in_buf[depth * x + 1];
215 } else {
216 ✗ encode_buf[x] = in_buf[depth * x];
217 ✗ encode_buf[x + 1] = in_buf[depth * x + 1];
218 }
219
220 11232 length = sgi_rle_encode(&pbc, encode_buf, width,
221 bytes_per_channel);
222
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 11232 if (length < 1) {
223 ✗ av_free(encode_buf);
224 ✗ return AVERROR_INVALIDDATA;
225 }
226
227 11232 bytestream2_put_be32(&tablen_pcb, length);
228 11232 in_buf -= p->linesize[0];
229 }
230 }
231
232 13 av_free(encode_buf);
233 } else {
234 ✗ for (z = 0; z < depth; z++) {
235 ✗ const uint8_t *in_buf = p->data[0] + p->linesize[0] * (height - 1) + z * bytes_per_channel;
236
237 ✗ for (y = 0; y < height; y++) {
238 ✗ for (x = 0; x < width * depth; x += depth)
239 ✗ if (bytes_per_channel == 1)
240 ✗ bytestream2_put_byte(&pbc, in_buf[x]);
241 else
242 ✗ if (put_be)
243 ✗ bytestream2_put_be16(&pbc, ((uint16_t *)in_buf)[x]);
244 else
245 ✗ bytestream2_put_le16(&pbc, ((uint16_t *)in_buf)[x]);
246
247 ✗ in_buf -= p->linesize[0];
248 }
249 }
250 }
251
252 /* total length */
253 13 pkt->size = bytestream2_tell_p(&pbc);
254 13 *got_packet = 1;
255
256 13 return 0;
257 }
258
259 #define OFFSET(x) offsetof(SgiContext, x)
260 #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
261 static const AVOption options[] = {
262 { "rle", "Use run-length compression", OFFSET(rle), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, VE },
263
264 { NULL },
265 };
266
267 static const AVClass sgi_class = {
268 .class_name = "sgi",
269 .item_name = av_default_item_name,
270 .option = options,
271 .version = LIBAVUTIL_VERSION_INT,
272 };
273
274 const FFCodec ff_sgi_encoder = {
275 .p.name = "sgi",
276 CODEC_LONG_NAME("SGI image"),
277 .p.type = AVMEDIA_TYPE_VIDEO,
278 .p.id = AV_CODEC_ID_SGI,
279 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE,
280 .priv_data_size = sizeof(SgiContext),
281 .p.priv_class = &sgi_class,
282 .init = encode_init,
283 FF_CODEC_ENCODE_CB(encode_frame),
284 CODEC_PIXFMTS(AV_PIX_FMT_RGB24, AV_PIX_FMT_RGBA,
285 AV_PIX_FMT_RGB48LE, AV_PIX_FMT_RGB48BE,
286 AV_PIX_FMT_RGBA64LE, AV_PIX_FMT_RGBA64BE,
287 AV_PIX_FMT_GRAY16LE, AV_PIX_FMT_GRAY16BE, AV_PIX_FMT_GRAY8),
288 };
289