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
23 #include "bytestream.h"
27 #define SGI_SINGLE_CHAN 2
28 #define SGI_MULTI_CHAN 3
30 typedef struct SgiContext {
34 static av_cold int encode_init(AVCodecContext *avctx)
36 SgiContext *s = avctx->priv_data;
38 avcodec_get_frame_defaults(&s->picture);
39 avctx->coded_frame = &s->picture;
44 static int encode_frame(AVCodecContext *avctx, unsigned char *buf,
45 int buf_size, void *data)
47 SgiContext *s = avctx->priv_data;
48 AVFrame * const p = &s->picture;
49 uint8_t *offsettab, *lengthtab, *in_buf, *encode_buf;
50 int x, y, z, length, tablesize;
51 unsigned int width, height, depth, dimension, bytes_per_channel, pixmax, put_be;
52 unsigned char *orig_buf = buf, *end_buf = buf + buf_size;
55 p->pict_type = AV_PICTURE_TYPE_I;
59 height = avctx->height;
60 bytes_per_channel = 1;
62 put_be = HAVE_BIGENDIAN;
64 switch (avctx->pix_fmt) {
66 dimension = SGI_SINGLE_CHAN;
67 depth = SGI_GRAYSCALE;
70 dimension = SGI_MULTI_CHAN;
74 dimension = SGI_MULTI_CHAN;
77 case PIX_FMT_GRAY16LE:
78 put_be = !HAVE_BIGENDIAN;
79 case PIX_FMT_GRAY16BE:
80 avctx->coder_type = FF_CODER_TYPE_RAW;
81 bytes_per_channel = 2;
83 dimension = SGI_SINGLE_CHAN;
84 depth = SGI_GRAYSCALE;
87 put_be = !HAVE_BIGENDIAN;
89 avctx->coder_type = FF_CODER_TYPE_RAW;
90 bytes_per_channel = 2;
92 dimension = SGI_MULTI_CHAN;
95 case PIX_FMT_RGBA64LE:
96 put_be = !HAVE_BIGENDIAN;
97 case PIX_FMT_RGBA64BE:
98 avctx->coder_type = FF_CODER_TYPE_RAW;
99 bytes_per_channel = 2;
101 dimension = SGI_MULTI_CHAN;
105 return AVERROR_INVALIDDATA;
108 tablesize = depth * height * 4;
109 length = tablesize * 2 + SGI_HEADER_SIZE;
111 if (buf_size < length) {
112 av_log(avctx, AV_LOG_ERROR, "buf_size too small(need %d, got %d)\n", length, buf_size);
117 bytestream_put_be16(&buf, SGI_MAGIC);
118 bytestream_put_byte(&buf, avctx->coder_type != FF_CODER_TYPE_RAW); /* RLE 1 - VERBATIM 0*/
119 bytestream_put_byte(&buf, bytes_per_channel);
120 bytestream_put_be16(&buf, dimension);
121 bytestream_put_be16(&buf, width);
122 bytestream_put_be16(&buf, height);
123 bytestream_put_be16(&buf, depth);
125 bytestream_put_be32(&buf, 0L); /* pixmin */
126 bytestream_put_be32(&buf, pixmax);
127 bytestream_put_be32(&buf, 0L); /* dummy */
130 memset(buf, 0, SGI_HEADER_SIZE);
134 bytestream_put_be32(&buf, 0L);
136 /* The rest of the 512 byte header is unused. */
140 if (avctx->coder_type != FF_CODER_TYPE_RAW) {
141 /* Skip RLE offset table. */
145 /* Skip RLE length table. */
148 /* Make an intermediate consecutive buffer. */
149 if (!(encode_buf = av_malloc(width)))
152 for (z = 0; z < depth; z++) {
153 in_buf = p->data[0] + p->linesize[0] * (height - 1) + z;
155 for (y = 0; y < height; y++) {
156 bytestream_put_be32(&offsettab, buf - orig_buf);
158 for (x = 0; x < width; x++)
159 encode_buf[x] = in_buf[depth * x];
161 if ((length = ff_rle_encode(buf, end_buf - buf - 1, encode_buf, 1, width, 0, 0, 0x80, 0)) < 1) {
167 bytestream_put_byte(&buf, 0);
168 bytestream_put_be32(&lengthtab, length + 1);
169 in_buf -= p->linesize[0];
175 for (z = 0; z < depth; z++) {
176 in_buf = p->data[0] + p->linesize[0] * (height - 1) + z * bytes_per_channel;
178 for (y = 0; y < height; y++) {
179 for (x = 0; x < width * depth; x += depth)
180 if (bytes_per_channel == 1) {
181 bytestream_put_byte(&buf, in_buf[x]);
184 bytestream_put_be16(&buf, ((uint16_t *)in_buf)[x]);
186 bytestream_put_le16(&buf, ((uint16_t *)in_buf)[x]);
190 in_buf -= p->linesize[0];
196 return buf - orig_buf;
199 AVCodec ff_sgi_encoder = {
201 .type = AVMEDIA_TYPE_VIDEO,
203 .priv_data_size = sizeof(SgiContext),
205 .encode = encode_frame,
206 .pix_fmts= (const enum PixelFormat[]){PIX_FMT_RGB24, PIX_FMT_RGBA,
207 PIX_FMT_RGB48LE, PIX_FMT_RGB48BE,
208 PIX_FMT_RGBA64LE, PIX_FMT_RGBA64BE,
209 PIX_FMT_GRAY16LE, PIX_FMT_GRAY16BE,
210 PIX_FMT_GRAY8, PIX_FMT_NONE},
211 .long_name= NULL_IF_CONFIG_SMALL("SGI image"),