3 * Todd Kirby <doubleshot@pacbell.net>
5 * This file is part of FFmpeg.
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.
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.
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
22 #include "libavutil/opt.h"
25 #include "bytestream.h"
30 #define SGI_SINGLE_CHAN 2
31 #define SGI_MULTI_CHAN 3
33 typedef struct SgiContext {
39 static av_cold int encode_init(AVCodecContext *avctx)
41 if (avctx->width > 65535 || avctx->height > 65535) {
42 av_log(avctx, AV_LOG_ERROR, "Unsupported resolution %dx%d. "
43 "SGI does not support resolutions above 65535x65535\n",
44 avctx->width, avctx->height);
45 return AVERROR_INVALIDDATA;
51 static int sgi_rle_encode(PutByteContext *pbc, const uint8_t *src,
54 int val, count, x, start = bytestream2_tell_p(pbc);
55 void (*bytestream2_put)(PutByteContext *, unsigned int);
58 bytestream2_put = bytestream2_put_byte;
60 bytestream2_put = bytestream2_put_be16;
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);
66 if (bytestream2_get_bytes_left_p(pbc) < bpp * 2)
67 return AVERROR_INVALIDDATA;
69 val = bpp == 1 ? *src : AV_RB16(src);
70 bytestream2_put(pbc, count);
71 bytestream2_put(pbc, val);
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;
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);
89 return bytestream2_tell_p(pbc) - start;
92 static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
93 const AVFrame *frame, int *got_packet)
95 SgiContext *s = avctx->priv_data;
96 const AVFrame * const p = frame;
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;
103 #if FF_API_CODED_FRAME
104 FF_DISABLE_DEPRECATION_WARNINGS
105 avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
106 avctx->coded_frame->key_frame = 1;
107 FF_ENABLE_DEPRECATION_WARNINGS
110 width = avctx->width;
111 height = avctx->height;
112 bytes_per_channel = 1;
114 put_be = HAVE_BIGENDIAN;
116 switch (avctx->pix_fmt) {
117 case AV_PIX_FMT_GRAY8:
118 dimension = SGI_SINGLE_CHAN;
119 depth = SGI_GRAYSCALE;
121 case AV_PIX_FMT_RGB24:
122 dimension = SGI_MULTI_CHAN;
125 case AV_PIX_FMT_RGBA:
126 dimension = SGI_MULTI_CHAN;
129 case AV_PIX_FMT_GRAY16LE:
130 put_be = !HAVE_BIGENDIAN;
131 case AV_PIX_FMT_GRAY16BE:
132 bytes_per_channel = 2;
134 dimension = SGI_SINGLE_CHAN;
135 depth = SGI_GRAYSCALE;
137 case AV_PIX_FMT_RGB48LE:
138 put_be = !HAVE_BIGENDIAN;
139 case AV_PIX_FMT_RGB48BE:
140 bytes_per_channel = 2;
142 dimension = SGI_MULTI_CHAN;
145 case AV_PIX_FMT_RGBA64LE:
146 put_be = !HAVE_BIGENDIAN;
147 case AV_PIX_FMT_RGBA64BE:
148 bytes_per_channel = 2;
150 dimension = SGI_MULTI_CHAN;
154 return AVERROR_INVALIDDATA;
157 tablesize = depth * height * 4;
158 length = SGI_HEADER_SIZE;
160 length += depth * height * width;
161 else // assume sgi_rle_encode() produces at most 2x size of input
162 length += tablesize * 2 + depth * height * (2 * width + 1);
164 if ((ret = ff_alloc_packet2(avctx, pkt, bytes_per_channel * length, 0)) < 0)
167 bytestream2_init_writer(&pbc, pkt->data, pkt->size);
170 bytestream2_put_be16(&pbc, SGI_MAGIC);
171 bytestream2_put_byte(&pbc, s->rle); /* RLE 1 - VERBATIM 0 */
172 bytestream2_put_byte(&pbc, bytes_per_channel);
173 bytestream2_put_be16(&pbc, dimension);
174 bytestream2_put_be16(&pbc, width);
175 bytestream2_put_be16(&pbc, height);
176 bytestream2_put_be16(&pbc, depth);
178 bytestream2_put_be32(&pbc, 0L); /* pixmin */
179 bytestream2_put_be32(&pbc, pixmax);
180 bytestream2_put_be32(&pbc, 0L); /* dummy */
183 for (i = 0; i < 80; i++)
184 bytestream2_put_byte(&pbc, 0L);
187 bytestream2_put_be32(&pbc, 0L);
189 /* The rest of the 512 byte header is unused. */
190 for (i = 0; i < 404; i++)
191 bytestream2_put_byte(&pbc, 0L);
194 PutByteContext taboff_pcb, tablen_pcb;
196 /* Skip RLE offset table. */
197 bytestream2_init_writer(&taboff_pcb, pbc.buffer, tablesize);
198 bytestream2_skip_p(&pbc, tablesize);
200 /* Skip RLE length table. */
201 bytestream2_init_writer(&tablen_pcb, pbc.buffer, tablesize);
202 bytestream2_skip_p(&pbc, tablesize);
204 /* Make an intermediate consecutive buffer. */
205 if (!(encode_buf = av_malloc(width * bytes_per_channel)))
206 return AVERROR(ENOMEM);
208 for (z = 0; z < depth; z++) {
209 in_buf = p->data[0] + p->linesize[0] * (height - 1) + z * bytes_per_channel;
211 for (y = 0; y < height; y++) {
212 bytestream2_put_be32(&taboff_pcb, bytestream2_tell_p(&pbc));
214 for (x = 0; x < width * bytes_per_channel; x += bytes_per_channel)
215 if (bytes_per_channel == 1) {
216 encode_buf[x] = in_buf[depth * x];
217 } else if (HAVE_BIGENDIAN ^ put_be) {
218 encode_buf[x + 1] = in_buf[depth * x];
219 encode_buf[x] = in_buf[depth * x + 1];
221 encode_buf[x] = in_buf[depth * x];
222 encode_buf[x + 1] = in_buf[depth * x + 1];
225 length = sgi_rle_encode(&pbc, encode_buf, width,
229 return AVERROR_INVALIDDATA;
232 bytestream2_put_be32(&tablen_pcb, length);
233 in_buf -= p->linesize[0];
239 for (z = 0; z < depth; z++) {
240 in_buf = p->data[0] + p->linesize[0] * (height - 1) + z * bytes_per_channel;
242 for (y = 0; y < height; y++) {
243 for (x = 0; x < width * depth; x += depth)
244 if (bytes_per_channel == 1)
245 bytestream2_put_byte(&pbc, in_buf[x]);
248 bytestream2_put_be16(&pbc, ((uint16_t *)in_buf)[x]);
250 bytestream2_put_le16(&pbc, ((uint16_t *)in_buf)[x]);
252 in_buf -= p->linesize[0];
258 pkt->size = bytestream2_tell_p(&pbc);
259 pkt->flags |= AV_PKT_FLAG_KEY;
265 #define OFFSET(x) offsetof(SgiContext, x)
266 #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
267 static const AVOption options[] = {
268 { "rle", "Use run-length compression", OFFSET(rle), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, VE },
273 static const AVClass sgi_class = {
275 .item_name = av_default_item_name,
277 .version = LIBAVUTIL_VERSION_INT,
280 AVCodec ff_sgi_encoder = {
282 .long_name = NULL_IF_CONFIG_SMALL("SGI image"),
283 .type = AVMEDIA_TYPE_VIDEO,
284 .id = AV_CODEC_ID_SGI,
285 .priv_data_size = sizeof(SgiContext),
286 .priv_class = &sgi_class,
288 .encode2 = encode_frame,
289 .pix_fmts = (const enum AVPixelFormat[]) {
290 AV_PIX_FMT_RGB24, AV_PIX_FMT_RGBA,
291 AV_PIX_FMT_RGB48LE, AV_PIX_FMT_RGB48BE,
292 AV_PIX_FMT_RGBA64LE, AV_PIX_FMT_RGBA64BE,
293 AV_PIX_FMT_GRAY16LE, AV_PIX_FMT_GRAY16BE, AV_PIX_FMT_GRAY8,
296 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,