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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 FFmpeg.
12  *
13  * FFmpeg 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  * FFmpeg 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 FFmpeg; if not, write to the Free Software
25  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26  */
27 
28 /**
29  * @file
30  * lossless JPEG encoder.
31  */
32 
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 "jpegtables.h"
41 #include "mjpegenc_common.h"
42 #include "mpegvideo.h"
43 #include "mjpeg.h"
44 #include "mjpegenc.h"
45 
46 typedef struct LJpegEncContext {
49  uint16_t matrix[64];
50 
51  int vsample[3];
52  int hsample[3];
53 
54  uint16_t huff_code_dc_luminance[12];
58 
59  uint16_t (*scratch)[4];
61 
63  const AVFrame *frame)
64 {
65  LJpegEncContext *s = avctx->priv_data;
66  const int width = frame->width;
67  const int height = frame->height;
68  const int linesize = frame->linesize[0];
69  uint16_t (*buffer)[4] = s->scratch;
70  const int predictor = avctx->prediction_method+1;
71  int left[3], top[3], topleft[3];
72  int x, y, i;
73 
74  for (i = 0; i < 3; i++)
75  buffer[0][i] = 1 << (9 - 1);
76 
77  for (y = 0; y < height; y++) {
78  const int modified_predictor = y ? predictor : 1;
79  uint8_t *ptr = frame->data[0] + (linesize * y);
80 
81  if (pb->buf_end - pb->buf - (put_bits_count(pb) >> 3) < width * 3 * 4) {
82  av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
83  return -1;
84  }
85 
86  for (i = 0; i < 3; i++)
87  top[i]= left[i]= topleft[i]= buffer[0][i];
88 
89  for (x = 0; x < width; x++) {
90  if(avctx->pix_fmt == AV_PIX_FMT_BGR24){
91  buffer[x][1] = ptr[3 * x + 0] - ptr[3 * x + 1] + 0x100;
92  buffer[x][2] = ptr[3 * x + 2] - ptr[3 * x + 1] + 0x100;
93  buffer[x][0] = (ptr[3 * x + 0] + 2 * ptr[3 * x + 1] + ptr[3 * x + 2]) >> 2;
94  }else{
95  buffer[x][1] = ptr[4 * x + 0] - ptr[4 * x + 1] + 0x100;
96  buffer[x][2] = ptr[4 * x + 2] - ptr[4 * x + 1] + 0x100;
97  buffer[x][0] = (ptr[4 * x + 0] + 2 * ptr[4 * x + 1] + ptr[4 * x + 2]) >> 2;
98  }
99 
100  for (i = 0; i < 3; i++) {
101  int pred, diff;
102 
103  PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
104 
105  topleft[i] = top[i];
106  top[i] = buffer[x+1][i];
107 
108  left[i] = buffer[x][i];
109 
110  diff = ((left[i] - pred + 0x100) & 0x1FF) - 0x100;
111 
112  if (i == 0)
114  else
116  }
117  }
118  }
119 
120  return 0;
121 }
122 
124  const AVFrame *frame, int predictor,
125  int mb_x, int mb_y)
126 {
127  int i;
128 
129  if (mb_x == 0 || mb_y == 0) {
130  for (i = 0; i < 3; i++) {
131  uint8_t *ptr;
132  int x, y, h, v, linesize;
133  h = s->hsample[i];
134  v = s->vsample[i];
135  linesize = frame->linesize[i];
136 
137  for (y = 0; y < v; y++) {
138  for (x = 0; x < h; x++) {
139  int pred;
140 
141  ptr = frame->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
142  if (y == 0 && mb_y == 0) {
143  if (x == 0 && mb_x == 0)
144  pred = 128;
145  else
146  pred = ptr[-1];
147  } else {
148  if (x == 0 && mb_x == 0) {
149  pred = ptr[-linesize];
150  } else {
151  PREDICT(pred, ptr[-linesize - 1], ptr[-linesize],
152  ptr[-1], predictor);
153  }
154  }
155 
156  if (i == 0)
157  ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
158  else
160  }
161  }
162  }
163  } else {
164  for (i = 0; i < 3; i++) {
165  uint8_t *ptr;
166  int x, y, h, v, linesize;
167  h = s->hsample[i];
168  v = s->vsample[i];
169  linesize = frame->linesize[i];
170 
171  for (y = 0; y < v; y++) {
172  for (x = 0; x < h; x++) {
173  int pred;
174 
175  ptr = frame->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
176  PREDICT(pred, ptr[-linesize - 1], ptr[-linesize], ptr[-1], predictor);
177 
178  if (i == 0)
179  ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
180  else
182  }
183  }
184  }
185  }
186 }
187 
189  const AVFrame *frame)
190 {
191  const int predictor = avctx->prediction_method + 1;
192  LJpegEncContext *s = avctx->priv_data;
193  const int mb_width = (avctx->width + s->hsample[0] - 1) / s->hsample[0];
194  const int mb_height = (avctx->height + s->vsample[0] - 1) / s->vsample[0];
195  int mb_x, mb_y;
196 
197  for (mb_y = 0; mb_y < mb_height; mb_y++) {
198  if (pb->buf_end - pb->buf - (put_bits_count(pb) >> 3) <
199  mb_width * 4 * 3 * s->hsample[0] * s->vsample[0]) {
200  av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
201  return -1;
202  }
203 
204  for (mb_x = 0; mb_x < mb_width; mb_x++)
205  ljpeg_encode_yuv_mb(s, pb, frame, predictor, mb_x, mb_y);
206  }
207 
208  return 0;
209 }
210 
212  const AVFrame *pict, int *got_packet)
213 {
214  LJpegEncContext *s = avctx->priv_data;
215  PutBitContext pb;
216  const int width = avctx->width;
217  const int height = avctx->height;
218  const int mb_width = (width + s->hsample[0] - 1) / s->hsample[0];
219  const int mb_height = (height + s->vsample[0] - 1) / s->vsample[0];
220  int max_pkt_size = FF_MIN_BUFFER_SIZE;
221  int ret, header_bits;
222 
223  if( avctx->pix_fmt == AV_PIX_FMT_BGR0
224  || avctx->pix_fmt == AV_PIX_FMT_BGRA
225  || avctx->pix_fmt == AV_PIX_FMT_BGR24)
226  max_pkt_size += width * height * 3 * 4;
227  else {
228  max_pkt_size += mb_width * mb_height * 3 * 4
229  * s->hsample[0] * s->vsample[0];
230  }
231 
232  if ((ret = ff_alloc_packet2(avctx, pkt, max_pkt_size)) < 0)
233  return ret;
234 
235  init_put_bits(&pb, pkt->data, pkt->size);
236 
238  s->matrix, s->matrix);
239 
240  header_bits = put_bits_count(&pb);
241 
242  if( avctx->pix_fmt == AV_PIX_FMT_BGR0
243  || avctx->pix_fmt == AV_PIX_FMT_BGRA
244  || avctx->pix_fmt == AV_PIX_FMT_BGR24)
245  ret = ljpeg_encode_bgr(avctx, &pb, pict);
246  else
247  ret = ljpeg_encode_yuv(avctx, &pb, pict);
248  if (ret < 0)
249  return ret;
250 
251  emms_c();
252 
253  ff_mjpeg_escape_FF(&pb, header_bits >> 3);
254  ff_mjpeg_encode_picture_trailer(&pb, header_bits);
255 
256  flush_put_bits(&pb);
257  pkt->size = put_bits_ptr(&pb) - pb.buf;
258  pkt->flags |= AV_PKT_FLAG_KEY;
259  *got_packet = 1;
260 
261  return 0;
262 }
263 
265 {
266  LJpegEncContext *s = avctx->priv_data;
267 
268  av_frame_free(&avctx->coded_frame);
269  av_freep(&s->scratch);
270 
271  return 0;
272 }
273 
275 {
276  LJpegEncContext *s = avctx->priv_data;
277 
278  if ((avctx->pix_fmt == AV_PIX_FMT_YUV420P ||
279  avctx->pix_fmt == AV_PIX_FMT_YUV422P ||
280  avctx->pix_fmt == AV_PIX_FMT_YUV444P ||
281  avctx->color_range == AVCOL_RANGE_MPEG) &&
283  av_log(avctx, AV_LOG_ERROR,
284  "Limited range YUV is non-standard, set strict_std_compliance to "
285  "at least unofficial to use it.\n");
286  return AVERROR(EINVAL);
287  }
288 
289  avctx->coded_frame = av_frame_alloc();
290  if (!avctx->coded_frame)
291  return AVERROR(ENOMEM);
292 
294  avctx->coded_frame->key_frame = 1;
295 
296  s->scratch = av_malloc_array(avctx->width + 1, sizeof(*s->scratch));
297  if (!s->scratch)
298  goto fail;
299 
300  ff_idctdsp_init(&s->idsp, avctx);
303 
304  ff_mjpeg_init_hvsample(avctx, s->hsample, s->vsample);
305 
314 
315  return 0;
316 fail:
317  ljpeg_encode_close(avctx);
318  return AVERROR(ENOMEM);
319 }
320 
322  .name = "ljpeg",
323  .long_name = NULL_IF_CONFIG_SMALL("Lossless JPEG"),
324  .type = AVMEDIA_TYPE_VIDEO,
325  .id = AV_CODEC_ID_LJPEG,
326  .priv_data_size = sizeof(LJpegEncContext),
328  .encode2 = ljpeg_encode_frame,
329  .close = ljpeg_encode_close,
331  .pix_fmts = (const enum AVPixelFormat[]){
336 };