Libav
ljpegenc.c
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1 /*
2  * lossless JPEG encoder
3  * Copyright (c) 2000, 2001 Fabrice Bellard
4  * Copyright (c) 2003 Alex Beregszaszi
5  * Copyright (c) 2003-2004 Michael Niedermayer
6  *
7  * Support for external huffman table, various fixes (AVID workaround),
8  * aspecting, new decode_frame mechanism and apple mjpeg-b support
9  * by Alex Beregszaszi
10  *
11  * This file is part of Libav.
12  *
13  * Libav is free software; you can redistribute it and/or
14  * modify it under the terms of the GNU Lesser General Public
15  * License as published by the Free Software Foundation; either
16  * version 2.1 of the License, or (at your option) any later version.
17  *
18  * Libav is distributed in the hope that it will be useful,
19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21  * Lesser General Public License for more details.
22  *
23  * You should have received a copy of the GNU Lesser General Public
24  * License along with Libav; if not, write to the Free Software
25  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26  */
27 
33 #include "libavutil/frame.h"
34 #include "libavutil/mem.h"
35 #include "libavutil/pixdesc.h"
36 
37 #include "avcodec.h"
38 #include "idctdsp.h"
39 #include "internal.h"
40 #include "mjpegenc_common.h"
41 #include "mpegvideo.h"
42 #include "mjpeg.h"
43 #include "mjpegenc.h"
44 
45 typedef struct LJpegEncContext {
48  uint16_t matrix[64];
49 
50  int vsample[3];
51  int hsample[3];
52 
53  uint16_t huff_code_dc_luminance[12];
57 
58  uint16_t (*scratch)[4];
60 
62  const AVFrame *frame)
63 {
64  LJpegEncContext *s = avctx->priv_data;
65  const int width = frame->width;
66  const int height = frame->height;
67  const int linesize = frame->linesize[0];
68  uint16_t (*buffer)[4] = s->scratch;
69  const int predictor = avctx->prediction_method+1;
70  int left[3], top[3], topleft[3];
71  int x, y, i;
72 
73  for (i = 0; i < 3; i++)
74  buffer[0][i] = 1 << (9 - 1);
75 
76  for (y = 0; y < height; y++) {
77  const int modified_predictor = y ? predictor : 1;
78  uint8_t *ptr = frame->data[0] + (linesize * y);
79 
80  if (pb->buf_end - pb->buf - (put_bits_count(pb) >> 3) < width * 3 * 3) {
81  av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
82  return -1;
83  }
84 
85  for (i = 0; i < 3; i++)
86  top[i]= left[i]= topleft[i]= buffer[0][i];
87 
88  for (x = 0; x < width; x++) {
89  buffer[x][1] = ptr[3 * x + 0] - ptr[3 * x + 1] + 0x100;
90  buffer[x][2] = ptr[3 * x + 2] - ptr[3 * x + 1] + 0x100;
91  buffer[x][0] = (ptr[3 * x + 0] + 2 * ptr[3 * x + 1] + ptr[3 * x + 2]) >> 2;
92 
93  for (i = 0; i < 3; i++) {
94  int pred, diff;
95 
96  PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
97 
98  topleft[i] = top[i];
99  top[i] = buffer[x+1][i];
100 
101  left[i] = buffer[x][i];
102 
103  diff = ((left[i] - pred + 0x100) & 0x1FF) - 0x100;
104 
105  if (i == 0)
107  else
109  }
110  }
111  }
112 
113  return 0;
114 }
115 
117  const AVFrame *frame, int predictor,
118  int mb_x, int mb_y)
119 {
120  int i;
121 
122  if (mb_x == 0 || mb_y == 0) {
123  for (i = 0; i < 3; i++) {
124  uint8_t *ptr;
125  int x, y, h, v, linesize;
126  h = s->hsample[i];
127  v = s->vsample[i];
128  linesize = frame->linesize[i];
129 
130  for (y = 0; y < v; y++) {
131  for (x = 0; x < h; x++) {
132  int pred;
133 
134  ptr = frame->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
135  if (y == 0 && mb_y == 0) {
136  if (x == 0 && mb_x == 0)
137  pred = 128;
138  else
139  pred = ptr[-1];
140  } else {
141  if (x == 0 && mb_x == 0) {
142  pred = ptr[-linesize];
143  } else {
144  PREDICT(pred, ptr[-linesize - 1], ptr[-linesize],
145  ptr[-1], predictor);
146  }
147  }
148 
149  if (i == 0)
150  ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
151  else
153  }
154  }
155  }
156  } else {
157  for (i = 0; i < 3; i++) {
158  uint8_t *ptr;
159  int x, y, h, v, linesize;
160  h = s->hsample[i];
161  v = s->vsample[i];
162  linesize = frame->linesize[i];
163 
164  for (y = 0; y < v; y++) {
165  for (x = 0; x < h; x++) {
166  int pred;
167 
168  ptr = frame->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
169  PREDICT(pred, ptr[-linesize - 1], ptr[-linesize], ptr[-1], predictor);
170 
171  if (i == 0)
172  ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
173  else
175  }
176  }
177  }
178  }
179 }
180 
182  const AVFrame *frame)
183 {
184  const int predictor = avctx->prediction_method + 1;
185  LJpegEncContext *s = avctx->priv_data;
186  const int mb_width = (avctx->width + s->hsample[0] - 1) / s->hsample[0];
187  const int mb_height = (avctx->height + s->vsample[0] - 1) / s->vsample[0];
188  int mb_x, mb_y;
189 
190  for (mb_y = 0; mb_y < mb_height; mb_y++) {
191  if (pb->buf_end - pb->buf - (put_bits_count(pb) >> 3) <
192  mb_width * 4 * 3 * s->hsample[0] * s->vsample[0]) {
193  av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
194  return -1;
195  }
196 
197  for (mb_x = 0; mb_x < mb_width; mb_x++)
198  ljpeg_encode_yuv_mb(s, pb, frame, predictor, mb_x, mb_y);
199  }
200 
201  return 0;
202 }
203 
205  const AVFrame *pict, int *got_packet)
206 {
207  LJpegEncContext *s = avctx->priv_data;
208  PutBitContext pb;
209  const int width = avctx->width;
210  const int height = avctx->height;
211  const int mb_width = (width + s->hsample[0] - 1) / s->hsample[0];
212  const int mb_height = (height + s->vsample[0] - 1) / s->vsample[0];
213  int max_pkt_size = FF_MIN_BUFFER_SIZE;
214  int ret, header_bits;
215 
216  if (avctx->pix_fmt == AV_PIX_FMT_BGR24)
217  max_pkt_size += width * height * 3 * 3;
218  else {
219  max_pkt_size += mb_width * mb_height * 3 * 4
220  * s->hsample[0] * s->vsample[0];
221  }
222  if ((ret = ff_alloc_packet(pkt, max_pkt_size)) < 0) {
223  av_log(avctx, AV_LOG_ERROR, "Error getting output packet of size %d.\n", max_pkt_size);
224  return ret;
225  }
226 
227  init_put_bits(&pb, pkt->data, pkt->size);
228 
230  s->matrix);
231 
232  header_bits = put_bits_count(&pb);
233 
234  if (avctx->pix_fmt == AV_PIX_FMT_BGR24)
235  ret = ljpeg_encode_bgr(avctx, &pb, pict);
236  else
237  ret = ljpeg_encode_yuv(avctx, &pb, pict);
238  if (ret < 0)
239  return ret;
240 
241  emms_c();
242 
243  ff_mjpeg_encode_picture_trailer(&pb, header_bits);
244 
245  flush_put_bits(&pb);
246  pkt->size = put_bits_ptr(&pb) - pb.buf;
247  pkt->flags |= AV_PKT_FLAG_KEY;
248  *got_packet = 1;
249 
250  return 0;
251 }
252 
254 {
255  LJpegEncContext *s = avctx->priv_data;
256 
257  av_frame_free(&avctx->coded_frame);
258  av_freep(&s->scratch);
259 
260  return 0;
261 }
262 
264 {
265  LJpegEncContext *s = avctx->priv_data;
266  int chroma_v_shift, chroma_h_shift;
267 
268  if ((avctx->pix_fmt == AV_PIX_FMT_YUV420P ||
269  avctx->pix_fmt == AV_PIX_FMT_YUV422P ||
270  avctx->pix_fmt == AV_PIX_FMT_YUV444P ||
271  avctx->color_range == AVCOL_RANGE_MPEG) &&
273  av_log(avctx, AV_LOG_ERROR,
274  "Limited range YUV is non-standard, set strict_std_compliance to "
275  "at least unofficial to use it.\n");
276  return AVERROR(EINVAL);
277  }
278 
279  avctx->coded_frame = av_frame_alloc();
280  if (!avctx->coded_frame)
281  return AVERROR(ENOMEM);
282 
284  avctx->coded_frame->key_frame = 1;
285 
286  s->scratch = av_malloc_array(avctx->width + 1, sizeof(*s->scratch));
287 
288  ff_idctdsp_init(&s->idsp, avctx);
291 
292  av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt, &chroma_h_shift,
293  &chroma_v_shift);
294 
295  if (avctx->pix_fmt == AV_PIX_FMT_BGR24) {
296  s->vsample[0] = s->hsample[0] =
297  s->vsample[1] = s->hsample[1] =
298  s->vsample[2] = s->hsample[2] = 1;
299  } else {
300  s->vsample[0] = 2;
301  s->vsample[1] = 2 >> chroma_v_shift;
302  s->vsample[2] = 2 >> chroma_v_shift;
303  s->hsample[0] = 2;
304  s->hsample[1] = 2 >> chroma_h_shift;
305  s->hsample[2] = 2 >> chroma_h_shift;
306  }
307 
316 
317  return 0;
318 }
319 
321  .name = "ljpeg",
322  .long_name = NULL_IF_CONFIG_SMALL("Lossless JPEG"),
323  .type = AVMEDIA_TYPE_VIDEO,
324  .id = AV_CODEC_ID_LJPEG,
325  .priv_data_size = sizeof(LJpegEncContext),
327  .encode2 = ljpeg_encode_frame,
329  .pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUVJ420P,
336  AV_PIX_FMT_NONE },
337 };
AVCodec ff_ljpeg_encoder
Definition: ljpegenc.c:320
IDCTDSPContext idsp
Definition: ljpegenc.c:46
This structure describes decoded (raw) audio or video data.
Definition: frame.h:135
planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
Definition: pixfmt.h:70
memory handling functions
AVFrame * coded_frame
the picture in the bitstream
Definition: avcodec.h:2532
MJPEG encoder.
enum AVColorRange color_range
MPEG vs JPEG YUV range.
Definition: avcodec.h:1766
Scantable.
Definition: idctdsp.h:29
int size
Definition: avcodec.h:974
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1254
const uint8_t avpriv_mjpeg_bits_dc_chrominance[17]
Definition: mjpeg.c:70
mpegvideo header.
AVCodec.
Definition: avcodec.h:2796
MJPEG encoder and decoder.
void av_freep(void *arg)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...
Definition: mem.c:198
uint16_t(* scratch)[4]
Definition: ljpegenc.c:58
uint8_t huff_size_dc_chrominance[12]
Definition: ljpegenc.c:56
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
#define emms_c()
Definition: internal.h:47
uint8_t * data
Definition: avcodec.h:973
void ff_mjpeg_build_huffman_codes(uint8_t *huff_size, uint16_t *huff_code, const uint8_t *bits_table, const uint8_t *val_table)
Definition: mjpeg.c:127
planar YUV 4:2:2, 16bpp, full scale (JPEG), deprecated in favor of PIX_FMT_YUV422P and setting color_...
Definition: pixfmt.h:78
#define FF_COMPLIANCE_UNOFFICIAL
Allow unofficial extensions.
Definition: avcodec.h:2345
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1019
#define PREDICT(ret, topleft, top, left, predictor)
Definition: mjpeg.h:129
static void predictor(uint8_t *src, int size)
Definition: exr.c:151
int width
width and height of the video frame
Definition: frame.h:174
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:123
static uint8_t * put_bits_ptr(PutBitContext *s)
Return the pointer to the byte where the bitstream writer will put the next bit.
Definition: put_bits.h:199
#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:150
void ff_mjpeg_encode_picture_header(AVCodecContext *avctx, PutBitContext *pb, ScanTable *intra_scantable, uint16_t intra_matrix[64])
uint8_t * buf
Definition: put_bits.h:38
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:2803
void ff_mjpeg_encode_picture_trailer(PutBitContext *pb, int header_bits)
uint16_t matrix[64]
Definition: ljpegenc.c:48
ScanTable scantable
Definition: ljpegenc.c:47
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:979
reference-counted frame API
static int put_bits_count(PutBitContext *s)
Definition: put_bits.h:67
planar YUV 4:2:2, 16bpp, (1 Cr & Cb sample per 2x1 Y samples)
Definition: pixfmt.h:69
static int ljpeg_encode_frame(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *pict, int *got_packet)
Definition: ljpegenc.c:204
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:196
static av_cold int ljpeg_encode_init(AVCodecContext *avctx)
Definition: ljpegenc.c:263
#define FF_MIN_BUFFER_SIZE
minimum encoding buffer size Used to avoid some checks during header writing.
Definition: avcodec.h:538
planar YUV 4:2:0, 12bpp, full scale (JPEG), deprecated in favor of PIX_FMT_YUV420P and setting color_...
Definition: pixfmt.h:77
int width
picture width / height.
Definition: avcodec.h:1224
static av_cold int ljpeg_encode_close(AVCodecContext *avctx)
Definition: ljpegenc.c:253
const uint8_t avpriv_mjpeg_bits_dc_luminance[17]
Definition: mjpeg.c:65
const uint8_t avpriv_mjpeg_val_dc[12]
Definition: mjpeg.c:67
uint16_t huff_code_dc_chrominance[12]
Definition: ljpegenc.c:54
static char buffer[20]
Definition: seek-test.c:31
int ff_alloc_packet(AVPacket *avpkt, int size)
Check AVPacket size and/or allocate data.
Definition: utils.c:1245
uint8_t idct_permutation[64]
IDCT input permutation.
Definition: idctdsp.h:94
packed RGB 8:8:8, 24bpp, BGRBGR...
Definition: pixfmt.h:68
static const float pred[4]
Definition: siprdata.h:259
static int width
Definition: utils.c:156
void ff_mjpeg_encode_dc(PutBitContext *pb, int val, uint8_t *huff_size, uint16_t *huff_code)
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
static void close(AVCodecParserContext *s)
Definition: h264_parser.c:490
uint8_t * buf_end
Definition: put_bits.h:38
const uint8_t ff_zigzag_direct[64]
Definition: mathtables.c:115
static int ljpeg_encode_yuv(AVCodecContext *avctx, PutBitContext *pb, const AVFrame *frame)
Definition: ljpegenc.c:181
static int ljpeg_encode_bgr(AVCodecContext *avctx, PutBitContext *pb, const AVFrame *frame)
Definition: ljpegenc.c:61
static void * av_malloc_array(size_t nmemb, size_t size)
Definition: mem.h:92
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:141
the normal 219*2^(n-8) "MPEG" YUV ranges
Definition: pixfmt.h:364
int height
Definition: gxfenc.c:72
uint16_t huff_code_dc_luminance[12]
Definition: ljpegenc.c:53
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:65
common internal api header.
static void flush_put_bits(PutBitContext *s)
Pad the end of the output stream with zeros.
Definition: put_bits.h:83
int vsample[3]
Definition: ljpegenc.c:50
int prediction_method
prediction method (needed for huffyuv)
Definition: avcodec.h:1410
uint8_t huff_size_dc_luminance[12]
Definition: ljpegenc.c:55
FF_ENABLE_DEPRECATION_WARNINGS int av_pix_fmt_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift)
Utility function to access log2_chroma_w log2_chroma_h from the pixel format AVPixFmtDescriptor.
Definition: pixdesc.c:1625
planar YUV 4:4:4, 24bpp, full scale (JPEG), deprecated in favor of PIX_FMT_YUV444P and setting color_...
Definition: pixfmt.h:79
static void init_put_bits(PutBitContext *s, uint8_t *buffer, int buffer_size)
Initialize the PutBitContext s.
Definition: put_bits.h:48
static av_cold int init(AVCodecParserContext *s)
Definition: h264_parser.c:499
void * priv_data
Definition: avcodec.h:1092
av_cold void ff_init_scantable(uint8_t *permutation, ScanTable *st, const uint8_t *src_scantable)
Definition: idctdsp.c:28
static void ljpeg_encode_yuv_mb(LJpegEncContext *s, PutBitContext *pb, const AVFrame *frame, int predictor, int mb_x, int mb_y)
Definition: ljpegenc.c:116
av_cold void ff_idctdsp_init(IDCTDSPContext *c, AVCodecContext *avctx)
Definition: idctdsp.c:156
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:191
int hsample[3]
Definition: ljpegenc.c:51
int height
Definition: frame.h:174
AVPixelFormat
Pixel format.
Definition: pixfmt.h:63
This structure stores compressed data.
Definition: avcodec.h:950
int strict_std_compliance
strictly follow the standard (MPEG4, ...).
Definition: avcodec.h:2341