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sgienc.c
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1 /*
2  * SGI image encoder
3  * Todd Kirby <doubleshot@pacbell.net>
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 "avcodec.h"
23 #include "bytestream.h"
24 #include "internal.h"
25 #include "sgi.h"
26 #include "rle.h"
27 
28 #define SGI_SINGLE_CHAN 2
29 #define SGI_MULTI_CHAN 3
30 
31 static av_cold int encode_init(AVCodecContext *avctx)
32 {
33  if (avctx->width > 65535 || avctx->height > 65535) {
34  av_log(avctx, AV_LOG_ERROR,
35  "Unsupported resolution %dx%d.\n", avctx->width, avctx->height);
36  av_log(avctx, AV_LOG_ERROR, "SGI does not support resolutions above 65535x65535\n");
37  return AVERROR_INVALIDDATA;
38  }
39 
40  avctx->coded_frame = av_frame_alloc();
41  if (!avctx->coded_frame)
42  return AVERROR(ENOMEM);
43 
44  return 0;
45 }
46 
47 static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
48  const AVFrame *frame, int *got_packet)
49 {
50  const AVFrame * const p = frame;
51  uint8_t *offsettab, *lengthtab, *in_buf, *encode_buf, *buf;
52  int x, y, z, length, tablesize, ret;
53  unsigned int width, height, depth, dimension;
54  unsigned int bytes_per_channel, pixmax, put_be;
55  unsigned char *end_buf;
56 
57  avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
58  avctx->coded_frame->key_frame = 1;
59 
60  width = avctx->width;
61  height = avctx->height;
62  bytes_per_channel = 1;
63  pixmax = 0xFF;
64  put_be = HAVE_BIGENDIAN;
65 
66  switch (avctx->pix_fmt) {
67  case AV_PIX_FMT_GRAY8:
68  dimension = SGI_SINGLE_CHAN;
69  depth = SGI_GRAYSCALE;
70  break;
71  case AV_PIX_FMT_RGB24:
72  dimension = SGI_MULTI_CHAN;
73  depth = SGI_RGB;
74  break;
75  case AV_PIX_FMT_RGBA:
76  dimension = SGI_MULTI_CHAN;
77  depth = SGI_RGBA;
78  break;
79  case AV_PIX_FMT_GRAY16LE:
80  put_be = !HAVE_BIGENDIAN;
81  case AV_PIX_FMT_GRAY16BE:
82  avctx->coder_type = FF_CODER_TYPE_RAW;
83  bytes_per_channel = 2;
84  pixmax = 0xFFFF;
85  dimension = SGI_SINGLE_CHAN;
86  depth = SGI_GRAYSCALE;
87  break;
88  case AV_PIX_FMT_RGB48LE:
89  put_be = !HAVE_BIGENDIAN;
90  case AV_PIX_FMT_RGB48BE:
91  avctx->coder_type = FF_CODER_TYPE_RAW;
92  bytes_per_channel = 2;
93  pixmax = 0xFFFF;
94  dimension = SGI_MULTI_CHAN;
95  depth = SGI_RGB;
96  break;
97  case AV_PIX_FMT_RGBA64LE:
98  put_be = !HAVE_BIGENDIAN;
99  case AV_PIX_FMT_RGBA64BE:
100  avctx->coder_type = FF_CODER_TYPE_RAW;
101  bytes_per_channel = 2;
102  pixmax = 0xFFFF;
103  dimension = SGI_MULTI_CHAN;
104  depth = SGI_RGBA;
105  break;
106  default:
107  return AVERROR_INVALIDDATA;
108  }
109 
110  tablesize = depth * height * 4;
111  length = SGI_HEADER_SIZE;
112  if (avctx->coder_type == FF_CODER_TYPE_RAW)
113  length += depth * height * width;
114  else // assume ff_rl_encode() produces at most 2x size of input
115  length += tablesize * 2 + depth * height * (2 * width + 1);
116 
117  if ((ret = ff_alloc_packet2(avctx, pkt, bytes_per_channel * length)) < 0)
118  return ret;
119  buf = pkt->data;
120  end_buf = pkt->data + pkt->size;
121 
122  /* Encode header. */
123  bytestream_put_be16(&buf, SGI_MAGIC);
124  bytestream_put_byte(&buf, avctx->coder_type != FF_CODER_TYPE_RAW); /* RLE 1 - VERBATIM 0*/
125  bytestream_put_byte(&buf, bytes_per_channel);
126  bytestream_put_be16(&buf, dimension);
127  bytestream_put_be16(&buf, width);
128  bytestream_put_be16(&buf, height);
129  bytestream_put_be16(&buf, depth);
130 
131  bytestream_put_be32(&buf, 0L); /* pixmin */
132  bytestream_put_be32(&buf, pixmax);
133  bytestream_put_be32(&buf, 0L); /* dummy */
134 
135  /* name */
136  memset(buf, 0, SGI_HEADER_SIZE);
137  buf += 80;
138 
139  /* colormap */
140  bytestream_put_be32(&buf, 0L);
141 
142  /* The rest of the 512 byte header is unused. */
143  buf += 404;
144  offsettab = buf;
145 
146  if (avctx->coder_type != FF_CODER_TYPE_RAW) {
147  /* Skip RLE offset table. */
148  buf += tablesize;
149  lengthtab = buf;
150 
151  /* Skip RLE length table. */
152  buf += tablesize;
153 
154  /* Make an intermediate consecutive buffer. */
155  if (!(encode_buf = av_malloc(width)))
156  return -1;
157 
158  for (z = 0; z < depth; z++) {
159  in_buf = p->data[0] + p->linesize[0] * (height - 1) + z;
160 
161  for (y = 0; y < height; y++) {
162  bytestream_put_be32(&offsettab, buf - pkt->data);
163 
164  for (x = 0; x < width; x++)
165  encode_buf[x] = in_buf[depth * x];
166 
167  if ((length = ff_rle_encode(buf, end_buf - buf - 1, encode_buf, 1, width, 0, 0, 0x80, 0)) < 1) {
168  av_free(encode_buf);
169  return -1;
170  }
171 
172  buf += length;
173  bytestream_put_byte(&buf, 0);
174  bytestream_put_be32(&lengthtab, length + 1);
175  in_buf -= p->linesize[0];
176  }
177  }
178 
179  av_free(encode_buf);
180  } else {
181  for (z = 0; z < depth; z++) {
182  in_buf = p->data[0] + p->linesize[0] * (height - 1) + z * bytes_per_channel;
183 
184  for (y = 0; y < height; y++) {
185  for (x = 0; x < width * depth; x += depth)
186  if (bytes_per_channel == 1) {
187  bytestream_put_byte(&buf, in_buf[x]);
188  } else {
189  if (put_be) {
190  bytestream_put_be16(&buf, ((uint16_t *)in_buf)[x]);
191  } else {
192  bytestream_put_le16(&buf, ((uint16_t *)in_buf)[x]);
193  }
194  }
195 
196  in_buf -= p->linesize[0];
197  }
198  }
199  }
200 
201  /* total length */
202  pkt->size = buf - pkt->data;
203  pkt->flags |= AV_PKT_FLAG_KEY;
204  *got_packet = 1;
205 
206  return 0;
207 }
208 
209 static av_cold int encode_close(AVCodecContext *avctx)
210 {
211  av_frame_free(&avctx->coded_frame);
212  return 0;
213 }
214 
215 AVCodec ff_sgi_encoder = {
216  .name = "sgi",
217  .long_name = NULL_IF_CONFIG_SMALL("SGI image"),
218  .type = AVMEDIA_TYPE_VIDEO,
219  .id = AV_CODEC_ID_SGI,
220  .init = encode_init,
221  .encode2 = encode_frame,
222  .close = encode_close,
223  .pix_fmts = (const enum AVPixelFormat[]) {
224  AV_PIX_FMT_RGB24, AV_PIX_FMT_RGBA,
225  AV_PIX_FMT_RGB48LE, AV_PIX_FMT_RGB48BE,
226  AV_PIX_FMT_RGBA64LE, AV_PIX_FMT_RGBA64BE,
227  AV_PIX_FMT_GRAY16LE, AV_PIX_FMT_GRAY16BE, AV_PIX_FMT_GRAY8,
228  AV_PIX_FMT_NONE
229  },
230 };
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