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path: root/libavcodec/sunrastenc.c (plain)
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1/*
2 * Sun Rasterfile (.sun/.ras/im{1,8,24}/.sunras) image encoder
3 * Copyright (c) 2012 Aneesh Dogra (lionaneesh) <lionaneesh@gmail.com>
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 "sunrast.h"
28
29typedef struct SUNRASTContext {
30 AVClass *class;
31
32 PutByteContext p;
33 int depth; ///< depth of pixel
34 int length; ///< length (bytes) of image
35 int type; ///< type of file
36 int maptype; ///< type of colormap
37 int maplength; ///< length (bytes) of colormap
38 int size;
39} SUNRASTContext;
40
41static void sunrast_image_write_header(AVCodecContext *avctx)
42{
43 SUNRASTContext *s = avctx->priv_data;
44
45 bytestream2_put_be32u(&s->p, RAS_MAGIC);
46 bytestream2_put_be32u(&s->p, avctx->width);
47 bytestream2_put_be32u(&s->p, avctx->height);
48 bytestream2_put_be32u(&s->p, s->depth);
49 bytestream2_put_be32u(&s->p, s->length);
50 bytestream2_put_be32u(&s->p, s->type);
51 bytestream2_put_be32u(&s->p, s->maptype);
52 bytestream2_put_be32u(&s->p, s->maplength);
53}
54
55static void sunrast_image_write_image(AVCodecContext *avctx,
56 const uint8_t *pixels,
57 const uint32_t *palette_data,
58 int linesize)
59{
60 SUNRASTContext *s = avctx->priv_data;
61 const uint8_t *ptr;
62 int len, alen, x, y;
63
64 if (s->maplength) { // palettized
65 PutByteContext pb_r, pb_g;
66 int len = s->maplength / 3;
67
68 pb_r = s->p;
69 bytestream2_skip_p(&s->p, len);
70 pb_g = s->p;
71 bytestream2_skip_p(&s->p, len);
72
73 for (x = 0; x < len; x++) {
74 uint32_t pixel = palette_data[x];
75
76 bytestream2_put_byteu(&pb_r, (pixel >> 16) & 0xFF);
77 bytestream2_put_byteu(&pb_g, (pixel >> 8) & 0xFF);
78 bytestream2_put_byteu(&s->p, pixel & 0xFF);
79 }
80 }
81
82 len = (s->depth * avctx->width + 7) >> 3;
83 alen = len + (len & 1);
84 ptr = pixels;
85
86 if (s->type == RT_BYTE_ENCODED) {
87 uint8_t value, value2;
88 int run;
89
90 ptr = pixels;
91
92#define GET_VALUE y >= avctx->height ? 0 : x >= len ? ptr[len-1] : ptr[x]
93
94 x = 0, y = 0;
95 value2 = GET_VALUE;
96 while (y < avctx->height) {
97 run = 1;
98 value = value2;
99 x++;
100 if (x >= alen) {
101 x = 0;
102 ptr += linesize, y++;
103 }
104
105 value2 = GET_VALUE;
106 while (value2 == value && run < 256 && y < avctx->height) {
107 x++;
108 run++;
109 if (x >= alen) {
110 x = 0;
111 ptr += linesize, y++;
112 }
113 value2 = GET_VALUE;
114 }
115
116 if (run > 2 || value == RLE_TRIGGER) {
117 bytestream2_put_byteu(&s->p, RLE_TRIGGER);
118 bytestream2_put_byteu(&s->p, run - 1);
119 if (run > 1)
120 bytestream2_put_byteu(&s->p, value);
121 } else if (run == 1) {
122 bytestream2_put_byteu(&s->p, value);
123 } else
124 bytestream2_put_be16u(&s->p, (value << 8) | value);
125 }
126
127 // update data length for header
128 s->length = bytestream2_tell_p(&s->p) - 32 - s->maplength;
129 } else {
130 for (y = 0; y < avctx->height; y++) {
131 bytestream2_put_buffer(&s->p, ptr, len);
132 if (len < alen)
133 bytestream2_put_byteu(&s->p, 0);
134 ptr += linesize;
135 }
136 }
137}
138
139static av_cold int sunrast_encode_init(AVCodecContext *avctx)
140{
141 SUNRASTContext *s = avctx->priv_data;
142
143#if FF_API_CODER_TYPE
144FF_DISABLE_DEPRECATION_WARNINGS
145 switch (avctx->coder_type) {
146 case FF_CODER_TYPE_RLE:
147 s->type = RT_BYTE_ENCODED;
148 break;
149 case FF_CODER_TYPE_RAW:
150 s->type = RT_STANDARD;
151 break;
152 default:
153 av_log(avctx, AV_LOG_ERROR, "invalid coder_type\n");
154 return AVERROR(EINVAL);
155 }
156FF_ENABLE_DEPRECATION_WARNINGS
157 if (s->type != RT_BYTE_ENCODED && s->type != RT_STANDARD)
158#endif
159 // adjust boolean option to RT equivalent
160 s->type++;
161
162 s->maptype = RMT_NONE;
163 s->maplength = 0;
164
165 switch (avctx->pix_fmt) {
166 case AV_PIX_FMT_MONOWHITE:
167 s->depth = 1;
168 break;
169 case AV_PIX_FMT_PAL8 :
170 s->maptype = RMT_EQUAL_RGB;
171 s->maplength = 3 * 256;
172 /* fall-through */
173 case AV_PIX_FMT_GRAY8:
174 s->depth = 8;
175 break;
176 case AV_PIX_FMT_BGR24:
177 s->depth = 24;
178 break;
179 default:
180 return AVERROR_BUG;
181 }
182 s->length = avctx->height * (FFALIGN(avctx->width * s->depth, 16) >> 3);
183 s->size = 32 + s->maplength + s->length * s->type;
184
185 return 0;
186}
187
188static int sunrast_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
189 const AVFrame *frame, int *got_packet_ptr)
190{
191 SUNRASTContext *s = avctx->priv_data;
192 int ret;
193
194 if ((ret = ff_alloc_packet2(avctx, avpkt, s->size, 0)) < 0)
195 return ret;
196
197 bytestream2_init_writer(&s->p, avpkt->data, avpkt->size);
198 sunrast_image_write_header(avctx);
199 sunrast_image_write_image(avctx, frame->data[0],
200 (const uint32_t *)frame->data[1],
201 frame->linesize[0]);
202 // update data length in header after RLE
203 if (s->type == RT_BYTE_ENCODED)
204 AV_WB32(&avpkt->data[16], s->length);
205
206 *got_packet_ptr = 1;
207 avpkt->flags |= AV_PKT_FLAG_KEY;
208 avpkt->size = bytestream2_tell_p(&s->p);
209 return 0;
210}
211
212#define OFFSET(x) offsetof(SUNRASTContext, x)
213#define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
214static const AVOption options[] = {
215 { "rle", "Use run-length compression", OFFSET(type), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, VE },
216
217 { NULL },
218};
219
220static const AVClass sunrast_class = {
221 .class_name = "sunrast",
222 .item_name = av_default_item_name,
223 .option = options,
224 .version = LIBAVUTIL_VERSION_INT,
225};
226
227#if FF_API_CODER_TYPE
228static const AVCodecDefault sunrast_defaults[] = {
229 { "coder", "rle" },
230 { NULL },
231};
232#endif
233
234AVCodec ff_sunrast_encoder = {
235 .name = "sunrast",
236 .long_name = NULL_IF_CONFIG_SMALL("Sun Rasterfile image"),
237 .type = AVMEDIA_TYPE_VIDEO,
238 .id = AV_CODEC_ID_SUNRAST,
239 .priv_data_size = sizeof(SUNRASTContext),
240 .init = sunrast_encode_init,
241 .encode2 = sunrast_encode_frame,
242#if FF_API_CODER_TYPE
243 .defaults = sunrast_defaults,
244#endif
245 .priv_class = &sunrast_class,
246 .pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_BGR24,
247 AV_PIX_FMT_PAL8,
248 AV_PIX_FMT_GRAY8,
249 AV_PIX_FMT_MONOWHITE,
250 AV_PIX_FMT_NONE },
251};
252
generated by cgit at 2024-05-17 02:03:17 (GMT)