FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/ljpegenc.c
Date: 2021-09-24 20:55:06
Exec Total Coverage
Lines: 89 134 66.4%
Branches: 49 106 46.2%

Line Branch Exec Source
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/opt.h"
36 #include "libavutil/pixdesc.h"
37
38 #include "avcodec.h"
39 #include "encode.h"
40 #include "idctdsp.h"
41 #include "internal.h"
42 #include "jpegtables.h"
43 #include "mathops.h"
44 #include "mjpegenc_common.h"
45 #include "mjpeg.h"
46
47 typedef struct LJpegEncContext {
48 AVClass *class;
49 IDCTDSPContext idsp;
50 ScanTable scantable;
51 uint16_t matrix[64];
52
53 int vsample[4];
54 int hsample[4];
55
56 uint16_t huff_code_dc_luminance[12];
57 uint16_t huff_code_dc_chrominance[12];
58 uint8_t huff_size_dc_luminance[12];
59 uint8_t huff_size_dc_chrominance[12];
60
61 uint16_t (*scratch)[4];
62 int pred;
63 } LJpegEncContext;
64
65 static int ljpeg_encode_bgr(AVCodecContext *avctx, PutBitContext *pb,
66 const AVFrame *frame)
67 {
68 LJpegEncContext *s = avctx->priv_data;
69 const int width = frame->width;
70 const int height = frame->height;
71 const int linesize = frame->linesize[0];
72 uint16_t (*buffer)[4] = s->scratch;
73 int left[4], top[4], topleft[4];
74 int x, y, i;
75
76 for (i = 0; i < 4; i++)
77 buffer[0][i] = 1 << (9 - 1);
78
79 for (y = 0; y < height; y++) {
80 const int modified_predictor = y ? s->pred : 1;
81 uint8_t *ptr = frame->data[0] + (linesize * y);
82
83 if (put_bytes_left(pb, 0) < width * 4 * 4) {
84 av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
85 return -1;
86 }
87
88 for (i = 0; i < 4; i++)
89 top[i]= left[i]= topleft[i]= buffer[0][i];
90
91 for (x = 0; x < width; x++) {
92 if(avctx->pix_fmt == AV_PIX_FMT_BGR24){
93 buffer[x][1] = ptr[3 * x + 0] - ptr[3 * x + 1] + 0x100;
94 buffer[x][2] = ptr[3 * x + 2] - ptr[3 * x + 1] + 0x100;
95 buffer[x][0] = (ptr[3 * x + 0] + 2 * ptr[3 * x + 1] + ptr[3 * x + 2]) >> 2;
96 }else{
97 buffer[x][1] = ptr[4 * x + 0] - ptr[4 * x + 1] + 0x100;
98 buffer[x][2] = ptr[4 * x + 2] - ptr[4 * x + 1] + 0x100;
99 buffer[x][0] = (ptr[4 * x + 0] + 2 * ptr[4 * x + 1] + ptr[4 * x + 2]) >> 2;
100 if (avctx->pix_fmt == AV_PIX_FMT_BGRA)
101 buffer[x][3] = ptr[4 * x + 3];
102 }
103
104 for (i = 0; i < 3 + (avctx->pix_fmt == AV_PIX_FMT_BGRA); i++) {
105 int pred, diff;
106
107 PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
108
109 topleft[i] = top[i];
110 top[i] = buffer[x+1][i];
111
112 left[i] = buffer[x][i];
113
114 diff = ((left[i] - pred + 0x100) & 0x1FF) - 0x100;
115
116 if (i == 0 || i == 3)
117 ff_mjpeg_encode_dc(pb, diff, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
118 else
119 ff_mjpeg_encode_dc(pb, diff, s->huff_size_dc_chrominance, s->huff_code_dc_chrominance);
120 }
121 }
122 }
123
124 return 0;
125 }
126
127 3816050 static inline void ljpeg_encode_yuv_mb(LJpegEncContext *s, PutBitContext *pb,
128 const AVFrame *frame, int predictor,
129 int mb_x, int mb_y)
130 {
131 int i;
132
133
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3816050 if (mb_x == 0 || mb_y == 0) {
134
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198000 for (i = 0; i < 3; i++) {
135 uint8_t *ptr;
136 int x, y, h, v, linesize;
137 148500 h = s->hsample[i];
138 148500 v = s->vsample[i];
139 148500 linesize = frame->linesize[i];
140
141
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346500 for (y = 0; y < v; y++) {
142
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495000 for (x = 0; x < h; x++) {
143 int pred;
144
145 297000 ptr = frame->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
146
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297000 if (y == 0 && mb_y == 0) {
147
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109000 if (x == 0 && mb_x == 0)
148 600 pred = 128;
149 else
150 108400 pred = ptr[-1];
151 } else {
152
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188000 if (x == 0 && mb_x == 0) {
153 89200 pred = ptr[-linesize];
154 } else {
155
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98800 PREDICT(pred, ptr[-linesize - 1], ptr[-linesize],
156 ptr[-1], predictor);
157 }
158 }
159
160
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297000 if (i == 0)
161 198000 ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
162 else
163 99000 ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_chrominance, s->huff_code_dc_chrominance);
164 }
165 }
166 }
167 } else {
168
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15066200 for (i = 0; i < 3; i++) {
169 uint8_t *ptr;
170 int x, y, h, v, linesize;
171 11299650 h = s->hsample[i];
172 11299650 v = s->vsample[i];
173 11299650 linesize = frame->linesize[i];
174
175
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176
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37665500 for (x = 0; x < h; x++) {
177 int pred;
178
179 22599300 ptr = frame->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
180
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22599300 PREDICT(pred, ptr[-linesize - 1], ptr[-linesize], ptr[-1], predictor);
181
182
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22599300 if (i == 0)
183 15066200 ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
184 else
185 7533100 ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_chrominance, s->huff_code_dc_chrominance);
186 }
187 }
188 }
189 }
190 3816050 }
191
192 200 static int ljpeg_encode_yuv(AVCodecContext *avctx, PutBitContext *pb,
193 const AVFrame *frame)
194 {
195 200 LJpegEncContext *s = avctx->priv_data;
196 200 const int mb_width = (avctx->width + s->hsample[0] - 1) / s->hsample[0];
197 200 const int mb_height = (avctx->height + s->vsample[0] - 1) / s->vsample[0];
198 int mb_x, mb_y;
199
200
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22650 for (mb_y = 0; mb_y < mb_height; mb_y++) {
201 22450 if (put_bytes_left(pb, 0) <
202
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22450 mb_width * 4 * 3 * s->hsample[0] * s->vsample[0]) {
203 av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
204 return -1;
205 }
206
207
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3838500 for (mb_x = 0; mb_x < mb_width; mb_x++)
208 3816050 ljpeg_encode_yuv_mb(s, pb, frame, s->pred, mb_x, mb_y);
209 }
210
211 200 return 0;
212 }
213
214 200 static int ljpeg_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
215 const AVFrame *pict, int *got_packet)
216 {
217 200 LJpegEncContext *s = avctx->priv_data;
218 PutBitContext pb;
219 200 const int width = avctx->width;
220 200 const int height = avctx->height;
221 200 const int mb_width = (width + s->hsample[0] - 1) / s->hsample[0];
222 200 const int mb_height = (height + s->vsample[0] - 1) / s->vsample[0];
223 200 int max_pkt_size = AV_INPUT_BUFFER_MIN_SIZE;
224 int ret, header_bits;
225
226
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200 if( avctx->pix_fmt == AV_PIX_FMT_BGR0
227
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200 || avctx->pix_fmt == AV_PIX_FMT_BGR24)
228 max_pkt_size += width * height * 3 * 4;
229
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200 else if(avctx->pix_fmt == AV_PIX_FMT_BGRA)
230 max_pkt_size += width * height * 4 * 4;
231 else {
232 200 max_pkt_size += mb_width * mb_height * 3 * 4
233 200 * s->hsample[0] * s->vsample[0];
234 }
235
236
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200 if ((ret = ff_alloc_packet(avctx, pkt, max_pkt_size)) < 0)
237 return ret;
238
239 200 init_put_bits(&pb, pkt->data, pkt->size);
240
241 200 ff_mjpeg_encode_picture_header(avctx, &pb, &s->scantable,
242 200 s->pred, s->matrix, s->matrix);
243
244 200 header_bits = put_bits_count(&pb);
245
246
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200 if( avctx->pix_fmt == AV_PIX_FMT_BGR0
247
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200 || avctx->pix_fmt == AV_PIX_FMT_BGRA
248
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200 || avctx->pix_fmt == AV_PIX_FMT_BGR24)
249 ret = ljpeg_encode_bgr(avctx, &pb, pict);
250 else
251 200 ret = ljpeg_encode_yuv(avctx, &pb, pict);
252
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200 if (ret < 0)
253 return ret;
254
255 200 emms_c();
256
257 200 ff_mjpeg_escape_FF(&pb, header_bits >> 3);
258 200 ff_mjpeg_encode_picture_trailer(&pb, header_bits);
259
260 200 flush_put_bits(&pb);
261 200 pkt->size = put_bits_ptr(&pb) - pb.buf;
262 200 pkt->flags |= AV_PKT_FLAG_KEY;
263 200 *got_packet = 1;
264
265 200 return 0;
266 }
267
268 4 static av_cold int ljpeg_encode_close(AVCodecContext *avctx)
269 {
270 4 LJpegEncContext *s = avctx->priv_data;
271
272 4 av_freep(&s->scratch);
273
274 4 return 0;
275 }
276
277 4 static av_cold int ljpeg_encode_init(AVCodecContext *avctx)
278 {
279 4 int ret = ff_mjpeg_encode_check_pix_fmt(avctx);
280 4 LJpegEncContext *s = avctx->priv_data;
281
282
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4 if (ret < 0)
283 return ret;
284
285 4 s->scratch = av_malloc_array(avctx->width + 1, sizeof(*s->scratch));
286
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4 if (!s->scratch)
287 return AVERROR(ENOMEM);
288
289 4 ff_idctdsp_init(&s->idsp, avctx);
290 4 ff_init_scantable(s->idsp.idct_permutation, &s->scantable,
291 ff_zigzag_direct);
292
293 4 ff_mjpeg_init_hvsample(avctx, s->hsample, s->vsample);
294
295 4 ff_mjpeg_build_huffman_codes(s->huff_size_dc_luminance,
296 4 s->huff_code_dc_luminance,
297 avpriv_mjpeg_bits_dc_luminance,
298 avpriv_mjpeg_val_dc);
299 4 ff_mjpeg_build_huffman_codes(s->huff_size_dc_chrominance,
300 4 s->huff_code_dc_chrominance,
301 avpriv_mjpeg_bits_dc_chrominance,
302 avpriv_mjpeg_val_dc);
303
304 4 return 0;
305 }
306
307 #define OFFSET(x) offsetof(LJpegEncContext, x)
308 #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
309 static const AVOption options[] = {
310 { "pred", "Prediction method", OFFSET(pred), AV_OPT_TYPE_INT, { .i64 = 1 }, 1, 3, VE, "pred" },
311 { "left", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 1 }, INT_MIN, INT_MAX, VE, "pred" },
312 { "plane", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 2 }, INT_MIN, INT_MAX, VE, "pred" },
313 { "median", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 3 }, INT_MIN, INT_MAX, VE, "pred" },
314
315 { NULL},
316 };
317
318 static const AVClass ljpeg_class = {
319 .class_name = "ljpeg",
320 .item_name = av_default_item_name,
321 .option = options,
322 .version = LIBAVUTIL_VERSION_INT,
323 };
324
325 const AVCodec ff_ljpeg_encoder = {
326 .name = "ljpeg",
327 .long_name = NULL_IF_CONFIG_SMALL("Lossless JPEG"),
328 .type = AVMEDIA_TYPE_VIDEO,
329 .id = AV_CODEC_ID_LJPEG,
330 .priv_data_size = sizeof(LJpegEncContext),
331 .priv_class = &ljpeg_class,
332 .init = ljpeg_encode_init,
333 .encode2 = ljpeg_encode_frame,
334 .close = ljpeg_encode_close,
335 .capabilities = AV_CODEC_CAP_FRAME_THREADS,
336 .pix_fmts = (const enum AVPixelFormat[]){
337 AV_PIX_FMT_BGR24 , AV_PIX_FMT_BGRA , AV_PIX_FMT_BGR0,
338 AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P,
339 AV_PIX_FMT_YUV420P , AV_PIX_FMT_YUV444P , AV_PIX_FMT_YUV422P,
340 AV_PIX_FMT_NONE},
341 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
342 };
343