FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/sgienc.c
Date: 2021-09-24 20:55:06
Exec Total Coverage
Lines: 78 137 56.9%
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/opt.h"
23
24 #include "avcodec.h"
25 #include "bytestream.h"
26 #include "encode.h"
27 #include "internal.h"
28 #include "sgi.h"
29 #include "rle.h"
30
31 #define SGI_SINGLE_CHAN 2
32 #define SGI_MULTI_CHAN 3
33
34 typedef struct SgiContext {
35 AVClass *class;
36
37 int rle;
38 } SgiContext;
39
40 1 static av_cold int encode_init(AVCodecContext *avctx)
41 {
42
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1 if (avctx->width > 65535 || avctx->height > 65535) {
43 av_log(avctx, AV_LOG_ERROR, "Unsupported resolution %dx%d. "
44 "SGI does not support resolutions above 65535x65535\n",
45 avctx->width, avctx->height);
46 return AVERROR_INVALIDDATA;
47 }
48
49 1 return 0;
50 }
51
52 11232 static int sgi_rle_encode(PutByteContext *pbc, const uint8_t *src,
53 int w, int bpp)
54 {
55 11232 int val, count, x, start = bytestream2_tell_p(pbc);
56 void (*bytestream2_put)(PutByteContext *, unsigned int);
57
58
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11232 if (bpp == 1)
59 11232 bytestream2_put = bytestream2_put_byte;
60 else
61 bytestream2_put = bytestream2_put_be16;
62
63
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97313 for (x = 0; x < w; x += count) {
64 /* see if we can encode the next set of pixels with RLE */
65 86081 count = ff_rle_count_pixels(src, w - x, bpp, 1);
66
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86081 if (count > 1) {
67
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34170 if (bytestream2_get_bytes_left_p(pbc) < bpp * 2)
68 return AVERROR_INVALIDDATA;
69
70
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34170 val = bpp == 1 ? *src : AV_RB16(src);
71 34170 bytestream2_put(pbc, count);
72 34170 bytestream2_put(pbc, val);
73 } else {
74 int i;
75 /* fall back on uncompressed */
76 51911 count = ff_rle_count_pixels(src, w - x, bpp, 0);
77
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51911 if (bytestream2_get_bytes_left_p(pbc) < bpp * (count + 1))
78 return AVERROR_INVALIDDATA;
79
80 51911 bytestream2_put(pbc, count + 0x80);
81
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3834780 for (i = 0; i < count; i++) {
82
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3782869 val = bpp == 1 ? src[i] : AV_RB16(src + i * bpp);
83 3782869 bytestream2_put(pbc, val);
84 }
85 }
86
87 86081 src += count * bpp;
88 }
89
90 11232 return bytestream2_tell_p(pbc) - start;
91 }
92
93 13 static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
94 const AVFrame *frame, int *got_packet)
95 {
96 13 SgiContext *s = avctx->priv_data;
97 13 const AVFrame * const p = frame;
98 PutByteContext pbc;
99 uint8_t *in_buf, *encode_buf;
100 int x, y, z, length, tablesize, ret, i;
101 unsigned int width, height, depth, dimension;
102 unsigned int bytes_per_channel, pixmax, put_be;
103
104 13 width = avctx->width;
105 13 height = avctx->height;
106 13 bytes_per_channel = 1;
107 13 pixmax = 0xFF;
108 13 put_be = HAVE_BIGENDIAN;
109
110
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13 switch (avctx->pix_fmt) {
111 case AV_PIX_FMT_GRAY8:
112 dimension = SGI_SINGLE_CHAN;
113 depth = SGI_GRAYSCALE;
114 break;
115 13 case AV_PIX_FMT_RGB24:
116 13 dimension = SGI_MULTI_CHAN;
117 13 depth = SGI_RGB;
118 13 break;
119 case AV_PIX_FMT_RGBA:
120 dimension = SGI_MULTI_CHAN;
121 depth = SGI_RGBA;
122 break;
123 case AV_PIX_FMT_GRAY16LE:
124 put_be = !HAVE_BIGENDIAN;
125 case AV_PIX_FMT_GRAY16BE:
126 bytes_per_channel = 2;
127 pixmax = 0xFFFF;
128 dimension = SGI_SINGLE_CHAN;
129 depth = SGI_GRAYSCALE;
130 break;
131 case AV_PIX_FMT_RGB48LE:
132 put_be = !HAVE_BIGENDIAN;
133 case AV_PIX_FMT_RGB48BE:
134 bytes_per_channel = 2;
135 pixmax = 0xFFFF;
136 dimension = SGI_MULTI_CHAN;
137 depth = SGI_RGB;
138 break;
139 case AV_PIX_FMT_RGBA64LE:
140 put_be = !HAVE_BIGENDIAN;
141 case AV_PIX_FMT_RGBA64BE:
142 bytes_per_channel = 2;
143 pixmax = 0xFFFF;
144 dimension = SGI_MULTI_CHAN;
145 depth = SGI_RGBA;
146 break;
147 default:
148 return AVERROR_INVALIDDATA;
149 }
150
151 13 tablesize = depth * height * 4;
152 13 length = SGI_HEADER_SIZE;
153
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13 if (!s->rle)
154 length += depth * height * width;
155 else // assume sgi_rle_encode() produces at most 2x size of input
156 13 length += tablesize * 2 + depth * height * (2 * width + 1);
157
158
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13 if ((ret = ff_alloc_packet(avctx, pkt, bytes_per_channel * length)) < 0)
159 return ret;
160
161 13 bytestream2_init_writer(&pbc, pkt->data, pkt->size);
162
163 /* Encode header. */
164 13 bytestream2_put_be16(&pbc, SGI_MAGIC);
165 13 bytestream2_put_byte(&pbc, s->rle); /* RLE 1 - VERBATIM 0 */
166 13 bytestream2_put_byte(&pbc, bytes_per_channel);
167 13 bytestream2_put_be16(&pbc, dimension);
168 13 bytestream2_put_be16(&pbc, width);
169 13 bytestream2_put_be16(&pbc, height);
170 13 bytestream2_put_be16(&pbc, depth);
171
172 13 bytestream2_put_be32(&pbc, 0L); /* pixmin */
173 13 bytestream2_put_be32(&pbc, pixmax);
174 13 bytestream2_put_be32(&pbc, 0L); /* dummy */
175
176 /* name */
177
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1053 for (i = 0; i < 80; i++)
178 1040 bytestream2_put_byte(&pbc, 0L);
179
180 /* colormap */
181 13 bytestream2_put_be32(&pbc, 0L);
182
183 /* The rest of the 512 byte header is unused. */
184
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5265 for (i = 0; i < 404; i++)
185 5252 bytestream2_put_byte(&pbc, 0L);
186
187
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13 if (s->rle) {
188 PutByteContext taboff_pcb, tablen_pcb;
189
190 /* Skip RLE offset table. */
191 13 bytestream2_init_writer(&taboff_pcb, pbc.buffer, tablesize);
192 13 bytestream2_skip_p(&pbc, tablesize);
193
194 /* Skip RLE length table. */
195 13 bytestream2_init_writer(&tablen_pcb, pbc.buffer, tablesize);
196 13 bytestream2_skip_p(&pbc, tablesize);
197
198 /* Make an intermediate consecutive buffer. */
199
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13 if (!(encode_buf = av_malloc(width * bytes_per_channel)))
200 return AVERROR(ENOMEM);
201
202
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52 for (z = 0; z < depth; z++) {
203 39 in_buf = p->data[0] + p->linesize[0] * (height - 1) + z * bytes_per_channel;
204
205
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11271 for (y = 0; y < height; y++) {
206 11232 bytestream2_put_be32(&taboff_pcb, bytestream2_tell_p(&pbc));
207
208
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3964896 for (x = 0; x < width * bytes_per_channel; x += bytes_per_channel)
209
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3953664 if (bytes_per_channel == 1) {
210 3953664 encode_buf[x] = in_buf[depth * x];
211 } else if (HAVE_BIGENDIAN ^ put_be) {
212 encode_buf[x + 1] = in_buf[depth * x];
213 encode_buf[x] = in_buf[depth * x + 1];
214 } else {
215 encode_buf[x] = in_buf[depth * x];
216 encode_buf[x + 1] = in_buf[depth * x + 1];
217 }
218
219 11232 length = sgi_rle_encode(&pbc, encode_buf, width,
220 bytes_per_channel);
221
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11232 if (length < 1) {
222 av_free(encode_buf);
223 return AVERROR_INVALIDDATA;
224 }
225
226 11232 bytestream2_put_be32(&tablen_pcb, length);
227 11232 in_buf -= p->linesize[0];
228 }
229 }
230
231 13 av_free(encode_buf);
232 } else {
233 for (z = 0; z < depth; z++) {
234 in_buf = p->data[0] + p->linesize[0] * (height - 1) + z * bytes_per_channel;
235
236 for (y = 0; y < height; y++) {
237 for (x = 0; x < width * depth; x += depth)
238 if (bytes_per_channel == 1)
239 bytestream2_put_byte(&pbc, in_buf[x]);
240 else
241 if (put_be)
242 bytestream2_put_be16(&pbc, ((uint16_t *)in_buf)[x]);
243 else
244 bytestream2_put_le16(&pbc, ((uint16_t *)in_buf)[x]);
245
246 in_buf -= p->linesize[0];
247 }
248 }
249 }
250
251 /* total length */
252 13 pkt->size = bytestream2_tell_p(&pbc);
253 13 pkt->flags |= AV_PKT_FLAG_KEY;
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 AVCodec ff_sgi_encoder = {
275 .name = "sgi",
276 .long_name = NULL_IF_CONFIG_SMALL("SGI image"),
277 .type = AVMEDIA_TYPE_VIDEO,
278 .id = AV_CODEC_ID_SGI,
279 .priv_data_size = sizeof(SgiContext),
280 .priv_class = &sgi_class,
281 .init = encode_init,
282 .encode2 = encode_frame,
283 .pix_fmts = (const enum AVPixelFormat[]) {
284 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 AV_PIX_FMT_NONE
289 },
290 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
291 };
292