FFmpeg
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 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 "libavutil/opt.h"
23 
24 #include "avcodec.h"
25 #include "bytestream.h"
26 #include "internal.h"
27 #include "sgi.h"
28 #include "rle.h"
29 
30 #define SGI_SINGLE_CHAN 2
31 #define SGI_MULTI_CHAN 3
32 
33 typedef struct SgiContext {
34  AVClass *class;
35 
36  int rle;
37 } SgiContext;
38 
40 {
41  if (avctx->width > 65535 || avctx->height > 65535) {
42  av_log(avctx, AV_LOG_ERROR,
43  "Unsupported resolution %dx%d.\n", avctx->width, avctx->height);
44  av_log(avctx, AV_LOG_ERROR, "SGI does not support resolutions above 65535x65535\n");
45  return AVERROR_INVALIDDATA;
46  }
47 
48  return 0;
49 }
50 
51 static int sgi_rle_encode(PutByteContext *pbc, const uint8_t *src,
52  int w, int bpp)
53 {
54  int val, count, x, start = bytestream2_tell_p(pbc);
55  void (*bytestream2_put)(PutByteContext *, unsigned int);
56 
57  if (bpp == 1)
58  bytestream2_put = bytestream2_put_byte;
59  else
60  bytestream2_put = bytestream2_put_be16;
61 
62  for (x = 0; x < w; x += count) {
63  /* see if we can encode the next set of pixels with RLE */
64  count = ff_rle_count_pixels(src, w - x, bpp, 1);
65  if (count > 1) {
66  if (bytestream2_get_bytes_left_p(pbc) < bpp * 2)
67  return AVERROR_INVALIDDATA;
68 
69  val = bpp == 1 ? *src : AV_RB16(src);
70  bytestream2_put(pbc, count);
71  bytestream2_put(pbc, val);
72  } else {
73  int i;
74  /* fall back on uncompressed */
75  count = ff_rle_count_pixels(src, w - x, bpp, 0);
76  if (bytestream2_get_bytes_left_p(pbc) < bpp * (count + 1))
77  return AVERROR_INVALIDDATA;
78 
79  bytestream2_put(pbc, count + 0x80);
80  for (i = 0; i < count; i++) {
81  val = bpp == 1 ? src[i] : AV_RB16(src + i * bpp);
82  bytestream2_put(pbc, val);
83  }
84  }
85 
86  src += count * bpp;
87  }
88 
89  return bytestream2_tell_p(pbc) - start;
90 }
91 
93  const AVFrame *frame, int *got_packet)
94 {
95  SgiContext *s = avctx->priv_data;
96  const AVFrame * const p = frame;
97  PutByteContext pbc;
98  uint8_t *in_buf, *encode_buf;
99  int x, y, z, length, tablesize, ret, i;
100  unsigned int width, height, depth, dimension;
101  unsigned int bytes_per_channel, pixmax, put_be;
102 
103 #if FF_API_CODED_FRAME
106  avctx->coded_frame->key_frame = 1;
108 #endif
109 
110 #if FF_API_CODER_TYPE
112  if (avctx->coder_type == FF_CODER_TYPE_RAW)
113  s->rle = 0;
115 #endif
116 
117  width = avctx->width;
118  height = avctx->height;
119  bytes_per_channel = 1;
120  pixmax = 0xFF;
121  put_be = HAVE_BIGENDIAN;
122 
123  switch (avctx->pix_fmt) {
124  case AV_PIX_FMT_GRAY8:
125  dimension = SGI_SINGLE_CHAN;
126  depth = SGI_GRAYSCALE;
127  break;
128  case AV_PIX_FMT_RGB24:
129  dimension = SGI_MULTI_CHAN;
130  depth = SGI_RGB;
131  break;
132  case AV_PIX_FMT_RGBA:
133  dimension = SGI_MULTI_CHAN;
134  depth = SGI_RGBA;
135  break;
136  case AV_PIX_FMT_GRAY16LE:
137  put_be = !HAVE_BIGENDIAN;
138  case AV_PIX_FMT_GRAY16BE:
139  bytes_per_channel = 2;
140  pixmax = 0xFFFF;
141  dimension = SGI_SINGLE_CHAN;
142  depth = SGI_GRAYSCALE;
143  break;
144  case AV_PIX_FMT_RGB48LE:
145  put_be = !HAVE_BIGENDIAN;
146  case AV_PIX_FMT_RGB48BE:
147  bytes_per_channel = 2;
148  pixmax = 0xFFFF;
149  dimension = SGI_MULTI_CHAN;
150  depth = SGI_RGB;
151  break;
152  case AV_PIX_FMT_RGBA64LE:
153  put_be = !HAVE_BIGENDIAN;
154  case AV_PIX_FMT_RGBA64BE:
155  bytes_per_channel = 2;
156  pixmax = 0xFFFF;
157  dimension = SGI_MULTI_CHAN;
158  depth = SGI_RGBA;
159  break;
160  default:
161  return AVERROR_INVALIDDATA;
162  }
163 
164  tablesize = depth * height * 4;
165  length = SGI_HEADER_SIZE;
166  if (!s->rle)
167  length += depth * height * width;
168  else // assume sgi_rle_encode() produces at most 2x size of input
169  length += tablesize * 2 + depth * height * (2 * width + 1);
170 
171  if ((ret = ff_alloc_packet2(avctx, pkt, bytes_per_channel * length, 0)) < 0)
172  return ret;
173 
174  bytestream2_init_writer(&pbc, pkt->data, pkt->size);
175 
176  /* Encode header. */
177  bytestream2_put_be16(&pbc, SGI_MAGIC);
178  bytestream2_put_byte(&pbc, s->rle); /* RLE 1 - VERBATIM 0 */
179  bytestream2_put_byte(&pbc, bytes_per_channel);
180  bytestream2_put_be16(&pbc, dimension);
181  bytestream2_put_be16(&pbc, width);
182  bytestream2_put_be16(&pbc, height);
183  bytestream2_put_be16(&pbc, depth);
184 
185  bytestream2_put_be32(&pbc, 0L); /* pixmin */
186  bytestream2_put_be32(&pbc, pixmax);
187  bytestream2_put_be32(&pbc, 0L); /* dummy */
188 
189  /* name */
190  for (i = 0; i < 80; i++)
191  bytestream2_put_byte(&pbc, 0L);
192 
193  /* colormap */
194  bytestream2_put_be32(&pbc, 0L);
195 
196  /* The rest of the 512 byte header is unused. */
197  for (i = 0; i < 404; i++)
198  bytestream2_put_byte(&pbc, 0L);
199 
200  if (s->rle) {
201  PutByteContext taboff_pcb, tablen_pcb;
202 
203  /* Skip RLE offset table. */
204  bytestream2_init_writer(&taboff_pcb, pbc.buffer, tablesize);
205  bytestream2_skip_p(&pbc, tablesize);
206 
207  /* Skip RLE length table. */
208  bytestream2_init_writer(&tablen_pcb, pbc.buffer, tablesize);
209  bytestream2_skip_p(&pbc, tablesize);
210 
211  /* Make an intermediate consecutive buffer. */
212  if (!(encode_buf = av_malloc(width * bytes_per_channel)))
213  return AVERROR(ENOMEM);
214 
215  for (z = 0; z < depth; z++) {
216  in_buf = p->data[0] + p->linesize[0] * (height - 1) + z * bytes_per_channel;
217 
218  for (y = 0; y < height; y++) {
219  bytestream2_put_be32(&taboff_pcb, bytestream2_tell_p(&pbc));
220 
221  for (x = 0; x < width * bytes_per_channel; x += bytes_per_channel)
222  encode_buf[x] = in_buf[depth * x];
223 
224  length = sgi_rle_encode(&pbc, encode_buf, width,
225  bytes_per_channel);
226  if (length < 1) {
227  av_free(encode_buf);
228  return AVERROR_INVALIDDATA;
229  }
230 
231  bytestream2_put_be32(&tablen_pcb, length);
232  in_buf -= p->linesize[0];
233  }
234  }
235 
236  av_free(encode_buf);
237  } else {
238  for (z = 0; z < depth; z++) {
239  in_buf = p->data[0] + p->linesize[0] * (height - 1) + z * bytes_per_channel;
240 
241  for (y = 0; y < height; y++) {
242  for (x = 0; x < width * depth; x += depth)
243  if (bytes_per_channel == 1)
244  bytestream2_put_byte(&pbc, in_buf[x]);
245  else
246  if (put_be)
247  bytestream2_put_be16(&pbc, ((uint16_t *)in_buf)[x]);
248  else
249  bytestream2_put_le16(&pbc, ((uint16_t *)in_buf)[x]);
250 
251  in_buf -= p->linesize[0];
252  }
253  }
254  }
255 
256  /* total length */
257  pkt->size = bytestream2_tell_p(&pbc);
258  pkt->flags |= AV_PKT_FLAG_KEY;
259  *got_packet = 1;
260 
261  return 0;
262 }
263 
264 #define OFFSET(x) offsetof(SgiContext, x)
265 #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
266 static const AVOption options[] = {
267  { "rle", "Use run-length compression", OFFSET(rle), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, VE },
268 
269  { NULL },
270 };
271 
272 static const AVClass sgi_class = {
273  .class_name = "sgi",
274  .item_name = av_default_item_name,
275  .option = options,
276  .version = LIBAVUTIL_VERSION_INT,
277 };
278 
280  .name = "sgi",
281  .long_name = NULL_IF_CONFIG_SMALL("SGI image"),
282  .type = AVMEDIA_TYPE_VIDEO,
283  .id = AV_CODEC_ID_SGI,
284  .priv_data_size = sizeof(SgiContext),
285  .priv_class = &sgi_class,
286  .init = encode_init,
287  .encode2 = encode_frame,
288  .pix_fmts = (const enum AVPixelFormat[]) {
294  },
295 };
#define NULL
Definition: coverity.c:32
const char const char void * val
Definition: avisynth_c.h:863
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
static const AVClass sgi_class
Definition: sgienc.c:272
This structure describes decoded (raw) audio or video data.
Definition: frame.h:295
int ff_rle_count_pixels(const uint8_t *start, int len, int bpp, int same)
Count up to 127 consecutive pixels which are either all the same or all differ from the previous and ...
Definition: rle.c:27
AVOption.
Definition: opt.h:246
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
packed RGB 8:8:8, 24bpp, RGBRGB...
Definition: pixfmt.h:68
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
int size
Definition: avcodec.h:1481
static av_always_inline void bytestream2_init_writer(PutByteContext *p, uint8_t *buf, int buf_size)
Definition: bytestream.h:143
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:191
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1778
static AVPacket pkt
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_WB24 unsigned int_TMPL AV_RB16
Definition: bytestream.h:87
#define src
Definition: vp8dsp.c:254
AVCodec.
Definition: avcodec.h:3492
static const AVOption options[]
Definition: sgienc.c:266
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
int ff_alloc_packet2(AVCodecContext *avctx, AVPacket *avpkt, int64_t size, int64_t min_size)
Check AVPacket size and/or allocate data.
Definition: encode.c:32
#define SGI_MULTI_CHAN
Definition: sgienc.c:31
uint8_t
#define av_cold
Definition: attributes.h:82
#define av_malloc(s)
AVOptions.
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:103
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:205
#define height
static int encode_frame(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *frame, int *got_packet)
Definition: sgienc.c:92
uint8_t * data
Definition: avcodec.h:1480
int rle
Definition: sgienc.c:36
The official guide to swscale for confused that consecutive non overlapping rectangles of dimension(0, slice_top)-(picture_width
#define av_log(a,...)
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1512
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
static av_always_inline unsigned int bytestream2_get_bytes_left_p(PutByteContext *p)
Definition: bytestream.h:159
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
GLsizei GLsizei * length
Definition: opengl_enc.c:114
const char * name
Name of the codec implementation.
Definition: avcodec.h:3499
GLsizei count
Definition: opengl_enc.c:108
static av_always_inline int bytestream2_tell_p(PutByteContext *p)
Definition: bytestream.h:193
packed RGBA 8:8:8:8, 32bpp, RGBARGBA...
Definition: pixfmt.h:93
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1486
#define SGI_RGBA
Definition: sgi.h:34
static av_always_inline void bytestream2_skip_p(PutByteContext *p, unsigned int size)
Definition: bytestream.h:176
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:378
#define width
int width
picture width / height.
Definition: avcodec.h:1741
uint8_t w
Definition: llviddspenc.c:38
typedef void(APIENTRY *FF_PFNGLACTIVETEXTUREPROC)(GLenum texture)
AVCodec ff_sgi_encoder
Definition: sgienc.c:279
static av_cold int encode_init(AVCodecContext *avctx)
Definition: sgienc.c:39
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
#define s(width, name)
Definition: cbs_vp9.c:257
#define L(x)
Definition: vp56_arith.h:36
attribute_deprecated int coder_type
Definition: avcodec.h:2485
uint8_t * buffer
Definition: bytestream.h:38
Libavcodec external API header.
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:326
main external API structure.
Definition: avcodec.h:1568
#define SGI_HEADER_SIZE
Definition: sgi.h:30
Describe the class of an AVClass context structure.
Definition: log.h:67
Y , 16bpp, big-endian.
Definition: pixfmt.h:97
#define SGI_GRAYSCALE
Definition: sgi.h:32
#define VE
Definition: sgienc.c:265
#define SGI_RGB
Definition: sgi.h:33
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:275
static int sgi_rle_encode(PutByteContext *pbc, const uint8_t *src, int w, int bpp)
Definition: sgienc.c:51
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:309
#define SGI_SINGLE_CHAN
Definition: sgienc.c:30
#define OFFSET(x)
Definition: sgienc.c:264
#define SGI_MAGIC
SGI image file signature.
Definition: sgi.h:28
int
Y , 8bpp.
Definition: pixfmt.h:74
#define FF_DISABLE_DEPRECATION_WARNINGS
Definition: internal.h:84
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:102
#define FF_CODER_TYPE_RAW
Definition: avcodec.h:2479
attribute_deprecated AVFrame * coded_frame
the picture in the bitstream
Definition: avcodec.h:2818
void * priv_data
Definition: avcodec.h:1595
#define av_free(p)
#define FF_ENABLE_DEPRECATION_WARNINGS
Definition: internal.h:85
Y , 16bpp, little-endian.
Definition: pixfmt.h:98
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:373
void INT64 start
Definition: avisynth_c.h:766
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
This structure stores compressed data.
Definition: avcodec.h:1457
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:206