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"
28 #define SGI_SINGLE_CHAN 2
29 #define SGI_MULTI_CHAN 3
31 typedef struct SgiContext {
35 static av_cold int encode_init(AVCodecContext *avctx)
37 SgiContext *s = avctx->priv_data;
39 if (avctx->width > 65535 || avctx->height > 65535) {
40 av_log(avctx, AV_LOG_ERROR, "SGI does not support resolutions above 65535x65535\n");
44 avcodec_get_frame_defaults(&s->picture);
45 avctx->coded_frame = &s->picture;
50 static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
51 const AVFrame *frame, int *got_packet)
53 SgiContext *s = avctx->priv_data;
54 AVFrame * const p = &s->picture;
55 uint8_t *offsettab, *lengthtab, *in_buf, *encode_buf, *buf;
56 int x, y, z, length, tablesize, ret;
57 unsigned int width, height, depth, dimension, bytes_per_channel, pixmax, put_be;
58 unsigned char *end_buf;
61 p->pict_type = AV_PICTURE_TYPE_I;
65 height = avctx->height;
66 bytes_per_channel = 1;
68 put_be = HAVE_BIGENDIAN;
70 switch (avctx->pix_fmt) {
72 dimension = SGI_SINGLE_CHAN;
73 depth = SGI_GRAYSCALE;
76 dimension = SGI_MULTI_CHAN;
80 dimension = SGI_MULTI_CHAN;
83 case PIX_FMT_GRAY16LE:
84 put_be = !HAVE_BIGENDIAN;
85 case PIX_FMT_GRAY16BE:
86 avctx->coder_type = FF_CODER_TYPE_RAW;
87 bytes_per_channel = 2;
89 dimension = SGI_SINGLE_CHAN;
90 depth = SGI_GRAYSCALE;
93 put_be = !HAVE_BIGENDIAN;
95 avctx->coder_type = FF_CODER_TYPE_RAW;
96 bytes_per_channel = 2;
98 dimension = SGI_MULTI_CHAN;
101 case PIX_FMT_RGBA64LE:
102 put_be = !HAVE_BIGENDIAN;
103 case PIX_FMT_RGBA64BE:
104 avctx->coder_type = FF_CODER_TYPE_RAW;
105 bytes_per_channel = 2;
107 dimension = SGI_MULTI_CHAN;
111 return AVERROR_INVALIDDATA;
114 tablesize = depth * height * 4;
115 length = SGI_HEADER_SIZE;
116 if (avctx->coder_type == FF_CODER_TYPE_RAW)
117 length += depth * height * width;
118 else // assume ff_rl_encode() produces at most 2x size of input
119 length += tablesize * 2 + depth * height * (2 * width + 1);
121 if ((ret = ff_alloc_packet2(avctx, pkt, bytes_per_channel * length)) < 0)
124 end_buf = pkt->data + pkt->size;
127 bytestream_put_be16(&buf, SGI_MAGIC);
128 bytestream_put_byte(&buf, avctx->coder_type != FF_CODER_TYPE_RAW); /* RLE 1 - VERBATIM 0*/
129 bytestream_put_byte(&buf, bytes_per_channel);
130 bytestream_put_be16(&buf, dimension);
131 bytestream_put_be16(&buf, width);
132 bytestream_put_be16(&buf, height);
133 bytestream_put_be16(&buf, depth);
135 bytestream_put_be32(&buf, 0L); /* pixmin */
136 bytestream_put_be32(&buf, pixmax);
137 bytestream_put_be32(&buf, 0L); /* dummy */
140 memset(buf, 0, SGI_HEADER_SIZE);
144 bytestream_put_be32(&buf, 0L);
146 /* The rest of the 512 byte header is unused. */
150 if (avctx->coder_type != FF_CODER_TYPE_RAW) {
151 /* Skip RLE offset table. */
155 /* Skip RLE length table. */
158 /* Make an intermediate consecutive buffer. */
159 if (!(encode_buf = av_malloc(width)))
162 for (z = 0; z < depth; z++) {
163 in_buf = p->data[0] + p->linesize[0] * (height - 1) + z;
165 for (y = 0; y < height; y++) {
166 bytestream_put_be32(&offsettab, buf - pkt->data);
168 for (x = 0; x < width; x++)
169 encode_buf[x] = in_buf[depth * x];
171 if ((length = ff_rle_encode(buf, end_buf - buf - 1, encode_buf, 1, width, 0, 0, 0x80, 0)) < 1) {
177 bytestream_put_byte(&buf, 0);
178 bytestream_put_be32(&lengthtab, length + 1);
179 in_buf -= p->linesize[0];
185 for (z = 0; z < depth; z++) {
186 in_buf = p->data[0] + p->linesize[0] * (height - 1) + z * bytes_per_channel;
188 for (y = 0; y < height; y++) {
189 for (x = 0; x < width * depth; x += depth)
190 if (bytes_per_channel == 1) {
191 bytestream_put_byte(&buf, in_buf[x]);
194 bytestream_put_be16(&buf, ((uint16_t *)in_buf)[x]);
196 bytestream_put_le16(&buf, ((uint16_t *)in_buf)[x]);
200 in_buf -= p->linesize[0];
206 pkt->size = buf - pkt->data;
207 pkt->flags |= AV_PKT_FLAG_KEY;
213 AVCodec ff_sgi_encoder = {
215 .type = AVMEDIA_TYPE_VIDEO,
216 .id = AV_CODEC_ID_SGI,
217 .priv_data_size = sizeof(SgiContext),
219 .encode2 = encode_frame,
220 .pix_fmts = (const enum PixelFormat[]){
221 PIX_FMT_RGB24, PIX_FMT_RGBA,
222 PIX_FMT_RGB48LE, PIX_FMT_RGB48BE,
223 PIX_FMT_RGBA64LE, PIX_FMT_RGBA64BE,
224 PIX_FMT_GRAY16LE, PIX_FMT_GRAY16BE,
225 PIX_FMT_GRAY8, PIX_FMT_NONE
227 .long_name = NULL_IF_CONFIG_SMALL("SGI image"),