Libav
sgienc.c
Go to the documentation of this file.
1 /*
2  * SGI image encoder
3  * Todd Kirby <doubleshot@pacbell.net>
4  *
5  * This file is part of Libav.
6  *
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.
11  *
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.
16  *
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
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 
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  return AVERROR_INVALIDDATA;
37  }
38 
39  avctx->coded_frame = av_frame_alloc();
40  if (!avctx->coded_frame)
41  return AVERROR(ENOMEM);
42 
43  return 0;
44 }
45 
46 static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
47  const AVFrame *frame, int *got_packet)
48 {
49  const AVFrame * const p = frame;
50  uint8_t *offsettab, *lengthtab, *in_buf, *encode_buf, *buf;
51  int x, y, z, length, tablesize, ret;
52  unsigned int width, height, depth, dimension;
53  unsigned int bytes_per_channel, pixmax, put_be;
54  unsigned char *end_buf;
55 
57  avctx->coded_frame->key_frame = 1;
58 
59  width = avctx->width;
60  height = avctx->height;
61  bytes_per_channel = 1;
62  pixmax = 0xFF;
63  put_be = HAVE_BIGENDIAN;
64 
65  switch (avctx->pix_fmt) {
66  case AV_PIX_FMT_GRAY8:
67  dimension = SGI_SINGLE_CHAN;
68  depth = SGI_GRAYSCALE;
69  break;
70  case AV_PIX_FMT_RGB24:
71  dimension = SGI_MULTI_CHAN;
72  depth = SGI_RGB;
73  break;
74  case AV_PIX_FMT_RGBA:
75  dimension = SGI_MULTI_CHAN;
76  depth = SGI_RGBA;
77  break;
79  put_be = !HAVE_BIGENDIAN;
82  bytes_per_channel = 2;
83  pixmax = 0xFFFF;
84  dimension = SGI_SINGLE_CHAN;
85  depth = SGI_GRAYSCALE;
86  break;
87  case AV_PIX_FMT_RGB48LE:
88  put_be = !HAVE_BIGENDIAN;
89  case AV_PIX_FMT_RGB48BE:
91  bytes_per_channel = 2;
92  pixmax = 0xFFFF;
93  dimension = SGI_MULTI_CHAN;
94  depth = SGI_RGB;
95  break;
97  put_be = !HAVE_BIGENDIAN;
100  bytes_per_channel = 2;
101  pixmax = 0xFFFF;
102  dimension = SGI_MULTI_CHAN;
103  depth = SGI_RGBA;
104  break;
105  default:
106  return AVERROR_INVALIDDATA;
107  }
108 
109  tablesize = depth * height * 4;
110  length = SGI_HEADER_SIZE;
111  if (avctx->coder_type == FF_CODER_TYPE_RAW)
112  length += depth * height * width;
113  else // assume ff_rl_encode() produces at most 2x size of input
114  length += tablesize * 2 + depth * height * (2 * width + 1);
115 
116  if ((ret = ff_alloc_packet(pkt, bytes_per_channel * length)) < 0) {
117  av_log(avctx, AV_LOG_ERROR, "Error getting output packet of size %d.\n", length);
118  return ret;
119  }
120  buf = pkt->data;
121  end_buf = pkt->data + pkt->size;
122 
123  /* Encode header. */
124  bytestream_put_be16(&buf, SGI_MAGIC);
125  bytestream_put_byte(&buf, avctx->coder_type != FF_CODER_TYPE_RAW); /* RLE 1 - VERBATIM 0*/
126  bytestream_put_byte(&buf, bytes_per_channel);
127  bytestream_put_be16(&buf, dimension);
128  bytestream_put_be16(&buf, width);
129  bytestream_put_be16(&buf, height);
130  bytestream_put_be16(&buf, depth);
131 
132  bytestream_put_be32(&buf, 0L); /* pixmin */
133  bytestream_put_be32(&buf, pixmax);
134  bytestream_put_be32(&buf, 0L); /* dummy */
135 
136  /* name */
137  memset(buf, 0, SGI_HEADER_SIZE);
138  buf += 80;
139 
140  /* colormap */
141  bytestream_put_be32(&buf, 0L);
142 
143  /* The rest of the 512 byte header is unused. */
144  buf += 404;
145  offsettab = buf;
146 
147  if (avctx->coder_type != FF_CODER_TYPE_RAW) {
148  /* Skip RLE offset table. */
149  buf += tablesize;
150  lengthtab = buf;
151 
152  /* Skip RLE length table. */
153  buf += tablesize;
154 
155  /* Make an intermediate consecutive buffer. */
156  if (!(encode_buf = av_malloc(width)))
157  return -1;
158 
159  for (z = 0; z < depth; z++) {
160  in_buf = p->data[0] + p->linesize[0] * (height - 1) + z;
161 
162  for (y = 0; y < height; y++) {
163  bytestream_put_be32(&offsettab, buf - pkt->data);
164 
165  for (x = 0; x < width; x++)
166  encode_buf[x] = in_buf[depth * x];
167 
168  if ((length = ff_rle_encode(buf, end_buf - buf - 1, encode_buf, 1, width, 0, 0, 0x80, 0)) < 1) {
169  av_free(encode_buf);
170  return -1;
171  }
172 
173  buf += length;
174  bytestream_put_byte(&buf, 0);
175  bytestream_put_be32(&lengthtab, length + 1);
176  in_buf -= p->linesize[0];
177  }
178  }
179 
180  av_free(encode_buf);
181  } else {
182  for (z = 0; z < depth; z++) {
183  in_buf = p->data[0] + p->linesize[0] * (height - 1) + z * bytes_per_channel;
184 
185  for (y = 0; y < height; y++) {
186  for (x = 0; x < width * depth; x += depth)
187  if (bytes_per_channel == 1)
188  bytestream_put_byte(&buf, in_buf[x]);
189  else
190  if (put_be)
191  bytestream_put_be16(&buf, ((uint16_t *)in_buf)[x]);
192  else
193  bytestream_put_le16(&buf, ((uint16_t *)in_buf)[x]);
194 
195  in_buf -= p->linesize[0];
196  }
197  }
198  }
199 
200  /* total length */
201  pkt->size = buf - pkt->data;
202  pkt->flags |= AV_PKT_FLAG_KEY;
203  *got_packet = 1;
204 
205  return 0;
206 }
207 
209 {
210  av_frame_free(&avctx->coded_frame);
211  return 0;
212 }
213 
215  .name = "sgi",
216  .long_name = NULL_IF_CONFIG_SMALL("SGI image"),
217  .type = AVMEDIA_TYPE_VIDEO,
218  .id = AV_CODEC_ID_SGI,
219  .init = encode_init,
220  .encode2 = encode_frame,
221  .close = encode_close,
222  .pix_fmts = (const enum AVPixelFormat[]) {
228  },
229 };
void * av_malloc(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:62
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:54
This structure describes decoded (raw) audio or video data.
Definition: frame.h:135
#define HAVE_BIGENDIAN
Definition: config.h:163
packed RGB 8:8:8, 24bpp, RGBRGB...
Definition: pixfmt.h:67
AVFrame * coded_frame
the picture in the bitstream
Definition: avcodec.h:2548
int size
Definition: avcodec.h:974
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1270
AVCodec.
Definition: avcodec.h:2812
#define SGI_MULTI_CHAN
Definition: sgienc.c:29
uint8_t
#define av_cold
Definition: attributes.h:66
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:57
packed RGB 16:16:16, 48bpp, 16R, 16G, 16B, the 2-byte value for each R/G/B component is stored as lit...
Definition: pixfmt.h:113
packed RGBA 16:16:16:16, 64bpp, 16R, 16G, 16B, 16A, the 2-byte value for each R/G/B/A component is st...
Definition: pixfmt.h:197
int coder_type
coder type
Definition: avcodec.h:2194
static int encode_frame(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *frame, int *got_packet)
Definition: sgienc.c:46
uint8_t * data
Definition: avcodec.h:973
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1019
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:123
void av_free(void *ptr)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc(). ...
Definition: mem.c:186
#define AVERROR(e)
Definition: error.h:43
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:69
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:145
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:169
const char * name
Name of the codec implementation.
Definition: avcodec.h:2819
packed RGBA 8:8:8:8, 32bpp, RGBARGBA...
Definition: pixfmt.h:96
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:979
#define SGI_RGBA
Definition: sgi.h:34
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:196
int width
picture width / height.
Definition: avcodec.h:1229
AVCodec ff_sgi_encoder
Definition: sgienc.c:214
static av_cold int encode_init(AVCodecContext *avctx)
Definition: sgienc.c:31
int ff_alloc_packet(AVPacket *avpkt, int size)
Check AVPacket size and/or allocate data.
Definition: utils.c:1245
#define L(x)
Definition: vp56_arith.h:36
static int width
Definition: utils.c:156
Libavcodec external API header.
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:153
main external API structure.
Definition: avcodec.h:1050
#define SGI_HEADER_SIZE
Definition: sgi.h:30
static av_cold int encode_close(AVCodecContext *avctx)
Definition: sgienc.c:208
Y , 16bpp, big-endian.
Definition: pixfmt.h:100
#define SGI_GRAYSCALE
Definition: sgi.h:32
#define SGI_RGB
Definition: sgi.h:33
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:141
#define SGI_SINGLE_CHAN
Definition: sgienc.c:28
int height
Definition: gxfenc.c:72
#define SGI_MAGIC
SGI image file signature.
Definition: sgi.h:28
Y , 8bpp.
Definition: pixfmt.h:73
common internal api header.
packed RGB 16:16:16, 48bpp, 16R, 16G, 16B, the 2-byte value for each R/G/B component is stored as big...
Definition: pixfmt.h:112
#define FF_CODER_TYPE_RAW
Definition: avcodec.h:2184
Y , 16bpp, little-endian.
Definition: pixfmt.h:101
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:191
int ff_rle_encode(uint8_t *outbuf, int out_size, const uint8_t *ptr, int bpp, int w, int add_rep, int xor_rep, int add_raw, int xor_raw)
RLE compress the row, with maximum size of out_size.
Definition: rle.c:58
AVPixelFormat
Pixel format.
Definition: pixfmt.h:63
This structure stores compressed data.
Definition: avcodec.h:950
packed RGBA 16:16:16:16, 64bpp, 16R, 16G, 16B, 16A, the 2-byte value for each R/G/B/A component is st...
Definition: pixfmt.h:198