3 * Todd Kirby <doubleshot@pacbell.net>
5 * This file is part of Libav.
7 * Libav 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 * Libav 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 Libav; 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 static av_cold int encode_init(AVCodecContext *avctx)
33 avctx->coded_frame = av_frame_alloc();
34 if (!avctx->coded_frame)
35 return AVERROR(ENOMEM);
40 static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
41 const AVFrame *frame, int *got_packet)
43 const AVFrame * const p = frame;
44 uint8_t *offsettab, *lengthtab, *in_buf, *encode_buf, *buf;
45 int x, y, z, length, tablesize, ret;
46 unsigned int width, height, depth, dimension;
47 unsigned char *end_buf;
49 avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
50 avctx->coded_frame->key_frame = 1;
53 height = avctx->height;
55 switch (avctx->pix_fmt) {
56 case AV_PIX_FMT_GRAY8:
57 dimension = SGI_SINGLE_CHAN;
58 depth = SGI_GRAYSCALE;
60 case AV_PIX_FMT_RGB24:
61 dimension = SGI_MULTI_CHAN;
65 dimension = SGI_MULTI_CHAN;
69 return AVERROR_INVALIDDATA;
72 tablesize = depth * height * 4;
73 length = SGI_HEADER_SIZE;
74 if (avctx->coder_type == FF_CODER_TYPE_RAW)
75 length += depth * height * width;
76 else // assume ff_rl_encode() produces at most 2x size of input
77 length += tablesize * 2 + depth * height * (2 * width + 1);
79 if ((ret = ff_alloc_packet(pkt, length)) < 0) {
80 av_log(avctx, AV_LOG_ERROR, "Error getting output packet of size %d.\n", length);
84 end_buf = pkt->data + pkt->size;
87 bytestream_put_be16(&buf, SGI_MAGIC);
88 bytestream_put_byte(&buf, avctx->coder_type != FF_CODER_TYPE_RAW); /* RLE 1 - VERBATIM 0*/
89 bytestream_put_byte(&buf, 1); /* bytes_per_channel */
90 bytestream_put_be16(&buf, dimension);
91 bytestream_put_be16(&buf, width);
92 bytestream_put_be16(&buf, height);
93 bytestream_put_be16(&buf, depth);
95 /* The rest are constant in this implementation. */
96 bytestream_put_be32(&buf, 0L); /* pixmin */
97 bytestream_put_be32(&buf, 255L); /* pixmax */
98 bytestream_put_be32(&buf, 0L); /* dummy */
101 memset(buf, 0, SGI_HEADER_SIZE);
105 bytestream_put_be32(&buf, 0L);
107 /* The rest of the 512 byte header is unused. */
111 if (avctx->coder_type != FF_CODER_TYPE_RAW) {
112 /* Skip RLE offset table. */
116 /* Skip RLE length table. */
119 /* Make an intermediate consecutive buffer. */
120 if (!(encode_buf = av_malloc(width)))
123 for (z = 0; z < depth; z++) {
124 in_buf = p->data[0] + p->linesize[0] * (height - 1) + z;
126 for (y = 0; y < height; y++) {
127 bytestream_put_be32(&offsettab, buf - pkt->data);
129 for (x = 0; x < width; x++)
130 encode_buf[x] = in_buf[depth * x];
132 if ((length = ff_rle_encode(buf, end_buf - buf - 1, encode_buf, 1, width, 0, 0, 0x80, 0)) < 1) {
138 bytestream_put_byte(&buf, 0);
139 bytestream_put_be32(&lengthtab, length + 1);
140 in_buf -= p->linesize[0];
146 for (z = 0; z < depth; z++) {
147 in_buf = p->data[0] + p->linesize[0] * (height - 1) + z;
149 for (y = 0; y < height; y++) {
150 for (x = 0; x < width * depth; x += depth)
151 bytestream_put_byte(&buf, in_buf[x]);
153 in_buf -= p->linesize[0];
159 pkt->size = buf - pkt->data;
160 pkt->flags |= AV_PKT_FLAG_KEY;
166 static av_cold int encode_close(AVCodecContext *avctx)
168 av_frame_free(&avctx->coded_frame);
172 AVCodec ff_sgi_encoder = {
174 .long_name = NULL_IF_CONFIG_SMALL("SGI image"),
175 .type = AVMEDIA_TYPE_VIDEO,
176 .id = AV_CODEC_ID_SGI,
178 .encode2 = encode_frame,
179 .close = encode_close,
180 .pix_fmts = (const enum AVPixelFormat[]){
181 AV_PIX_FMT_RGB24, AV_PIX_FMT_RGBA, AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE