summaryrefslogtreecommitdiff
path: root/libavcodec/sgienc.c (plain)
blob: 13756f16088b2a1b8c9753cc3dc64a041f78fe90
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 "internal.h"
27#include "sgi.h"
28#include "rle.h"
29
30#define SGI_SINGLE_CHAN 2
31#define SGI_MULTI_CHAN 3
32
33typedef struct SgiContext {
34 AVClass *class;
35
36 int rle;
37} SgiContext;
38
39static av_cold int encode_init(AVCodecContext *avctx)
40{
41 if (avctx->width > 65535 || avctx->height > 65535) {
42 av_log(avctx, AV_LOG_ERROR,
43 "Unsupported resolution %dx%d.\n", avctx->width, avctx->height);
44 av_log(avctx, AV_LOG_ERROR, "SGI does not support resolutions above 65535x65535\n");
45 return AVERROR_INVALIDDATA;
46 }
47
48 return 0;
49}
50
51static int sgi_rle_encode(PutByteContext *pbc, const uint8_t *src,
52 int w, int bpp)
53{
54 int val, count, x, start = bytestream2_tell_p(pbc);
55 void (*bytestream2_put)(PutByteContext *, unsigned int);
56
57 if (bpp == 1)
58 bytestream2_put = bytestream2_put_byte;
59 else
60 bytestream2_put = bytestream2_put_be16;
61
62 for (x = 0; x < w; x += count) {
63 /* see if we can encode the next set of pixels with RLE */
64 count = ff_rle_count_pixels(src, w - x, bpp, 1);
65 if (count > 1) {
66 if (bytestream2_get_bytes_left_p(pbc) < bpp * 2)
67 return AVERROR_INVALIDDATA;
68
69 val = bpp == 1 ? *src : AV_RB16(src);
70 bytestream2_put(pbc, count);
71 bytestream2_put(pbc, val);
72 } else {
73 int i;
74 /* fall back on uncompressed */
75 count = ff_rle_count_pixels(src, w - x, bpp, 0);
76 if (bytestream2_get_bytes_left_p(pbc) < bpp * (count + 1))
77 return AVERROR_INVALIDDATA;
78
79 bytestream2_put(pbc, count + 0x80);
80 for (i = 0; i < count; i++) {
81 val = bpp == 1 ? src[i] : AV_RB16(src + i * bpp);
82 bytestream2_put(pbc, val);
83 }
84 }
85
86 src += count * bpp;
87 }
88
89 return bytestream2_tell_p(pbc) - start;
90}
91
92static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
93 const AVFrame *frame, int *got_packet)
94{
95 SgiContext *s = avctx->priv_data;
96 const AVFrame * const p = frame;
97 PutByteContext pbc;
98 uint8_t *in_buf, *encode_buf;
99 int x, y, z, length, tablesize, ret, i;
100 unsigned int width, height, depth, dimension;
101 unsigned int bytes_per_channel, pixmax, put_be;
102
103#if FF_API_CODED_FRAME
104FF_DISABLE_DEPRECATION_WARNINGS
105 avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
106 avctx->coded_frame->key_frame = 1;
107FF_ENABLE_DEPRECATION_WARNINGS
108#endif
109
110#if FF_API_CODER_TYPE
111FF_DISABLE_DEPRECATION_WARNINGS
112 if (avctx->coder_type == FF_CODER_TYPE_RAW)
113 s->rle = 0;
114FF_ENABLE_DEPRECATION_WARNINGS
115#endif
116
117 width = avctx->width;
118 height = avctx->height;
119 bytes_per_channel = 1;
120 pixmax = 0xFF;
121 put_be = HAVE_BIGENDIAN;
122
123 switch (avctx->pix_fmt) {
124 case AV_PIX_FMT_GRAY8:
125 dimension = SGI_SINGLE_CHAN;
126 depth = SGI_GRAYSCALE;
127 break;
128 case AV_PIX_FMT_RGB24:
129 dimension = SGI_MULTI_CHAN;
130 depth = SGI_RGB;
131 break;
132 case AV_PIX_FMT_RGBA:
133 dimension = SGI_MULTI_CHAN;
134 depth = SGI_RGBA;
135 break;
136 case AV_PIX_FMT_GRAY16LE:
137 put_be = !HAVE_BIGENDIAN;
138 case AV_PIX_FMT_GRAY16BE:
139 bytes_per_channel = 2;
140 pixmax = 0xFFFF;
141 dimension = SGI_SINGLE_CHAN;
142 depth = SGI_GRAYSCALE;
143 break;
144 case AV_PIX_FMT_RGB48LE:
145 put_be = !HAVE_BIGENDIAN;
146 case AV_PIX_FMT_RGB48BE:
147 bytes_per_channel = 2;
148 pixmax = 0xFFFF;
149 dimension = SGI_MULTI_CHAN;
150 depth = SGI_RGB;
151 break;
152 case AV_PIX_FMT_RGBA64LE:
153 put_be = !HAVE_BIGENDIAN;
154 case AV_PIX_FMT_RGBA64BE:
155 bytes_per_channel = 2;
156 pixmax = 0xFFFF;
157 dimension = SGI_MULTI_CHAN;
158 depth = SGI_RGBA;
159 break;
160 default:
161 return AVERROR_INVALIDDATA;
162 }
163
164 tablesize = depth * height * 4;
165 length = SGI_HEADER_SIZE;
166 if (!s->rle)
167 length += depth * height * width;
168 else // assume sgi_rle_encode() produces at most 2x size of input
169 length += tablesize * 2 + depth * height * (2 * width + 1);
170
171 if ((ret = ff_alloc_packet2(avctx, pkt, bytes_per_channel * length, 0)) < 0)
172 return ret;
173
174 bytestream2_init_writer(&pbc, pkt->data, pkt->size);
175
176 /* Encode header. */
177 bytestream2_put_be16(&pbc, SGI_MAGIC);
178 bytestream2_put_byte(&pbc, s->rle); /* RLE 1 - VERBATIM 0 */
179 bytestream2_put_byte(&pbc, bytes_per_channel);
180 bytestream2_put_be16(&pbc, dimension);
181 bytestream2_put_be16(&pbc, width);
182 bytestream2_put_be16(&pbc, height);
183 bytestream2_put_be16(&pbc, depth);
184
185 bytestream2_put_be32(&pbc, 0L); /* pixmin */
186 bytestream2_put_be32(&pbc, pixmax);
187 bytestream2_put_be32(&pbc, 0L); /* dummy */
188
189 /* name */
190 for (i = 0; i < 80; i++)
191 bytestream2_put_byte(&pbc, 0L);
192
193 /* colormap */
194 bytestream2_put_be32(&pbc, 0L);
195
196 /* The rest of the 512 byte header is unused. */
197 for (i = 0; i < 404; i++)
198 bytestream2_put_byte(&pbc, 0L);
199
200 if (s->rle) {
201 PutByteContext taboff_pcb, tablen_pcb;
202
203 /* Skip RLE offset table. */
204 bytestream2_init_writer(&taboff_pcb, pbc.buffer, tablesize);
205 bytestream2_skip_p(&pbc, tablesize);
206
207 /* Skip RLE length table. */
208 bytestream2_init_writer(&tablen_pcb, pbc.buffer, tablesize);
209 bytestream2_skip_p(&pbc, tablesize);
210
211 /* Make an intermediate consecutive buffer. */
212 if (!(encode_buf = av_malloc(width * bytes_per_channel)))
213 return AVERROR(ENOMEM);
214
215 for (z = 0; z < depth; z++) {
216 in_buf = p->data[0] + p->linesize[0] * (height - 1) + z * bytes_per_channel;
217
218 for (y = 0; y < height; y++) {
219 bytestream2_put_be32(&taboff_pcb, bytestream2_tell_p(&pbc));
220
221 for (x = 0; x < width * bytes_per_channel; x += bytes_per_channel)
222 encode_buf[x] = in_buf[depth * x];
223
224 length = sgi_rle_encode(&pbc, encode_buf, width,
225 bytes_per_channel);
226 if (length < 1) {
227 av_free(encode_buf);
228 return AVERROR_INVALIDDATA;
229 }
230
231 bytestream2_put_be32(&tablen_pcb, length);
232 in_buf -= p->linesize[0];
233 }
234 }
235
236 av_free(encode_buf);
237 } else {
238 for (z = 0; z < depth; z++) {
239 in_buf = p->data[0] + p->linesize[0] * (height - 1) + z * bytes_per_channel;
240
241 for (y = 0; y < height; y++) {
242 for (x = 0; x < width * depth; x += depth)
243 if (bytes_per_channel == 1)
244 bytestream2_put_byte(&pbc, in_buf[x]);
245 else
246 if (put_be)
247 bytestream2_put_be16(&pbc, ((uint16_t *)in_buf)[x]);
248 else
249 bytestream2_put_le16(&pbc, ((uint16_t *)in_buf)[x]);
250
251 in_buf -= p->linesize[0];
252 }
253 }
254 }
255
256 /* total length */
257 pkt->size = bytestream2_tell_p(&pbc);
258 pkt->flags |= AV_PKT_FLAG_KEY;
259 *got_packet = 1;
260
261 return 0;
262}
263
264#define OFFSET(x) offsetof(SgiContext, x)
265#define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
266static const AVOption options[] = {
267 { "rle", "Use run-length compression", OFFSET(rle), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, VE },
268
269 { NULL },
270};
271
272static const AVClass sgi_class = {
273 .class_name = "sgi",
274 .item_name = av_default_item_name,
275 .option = options,
276 .version = LIBAVUTIL_VERSION_INT,
277};
278
279AVCodec ff_sgi_encoder = {
280 .name = "sgi",
281 .long_name = NULL_IF_CONFIG_SMALL("SGI image"),
282 .type = AVMEDIA_TYPE_VIDEO,
283 .id = AV_CODEC_ID_SGI,
284 .priv_data_size = sizeof(SgiContext),
285 .priv_class = &sgi_class,
286 .init = encode_init,
287 .encode2 = encode_frame,
288 .pix_fmts = (const enum AVPixelFormat[]) {
289 AV_PIX_FMT_RGB24, AV_PIX_FMT_RGBA,
290 AV_PIX_FMT_RGB48LE, AV_PIX_FMT_RGB48BE,
291 AV_PIX_FMT_RGBA64LE, AV_PIX_FMT_RGBA64BE,
292 AV_PIX_FMT_GRAY16LE, AV_PIX_FMT_GRAY16BE, AV_PIX_FMT_GRAY8,
293 AV_PIX_FMT_NONE
294 },
295};
296
generated by cgit at 2024-05-17 03:18:05 (GMT)