1 /*
2 * MJPEG 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 * MJPEG encoder.
31 */
32
33 #include "libavutil/pixdesc.h"
34
35 #include "avcodec.h"
36 #include "jpegtables.h"
37 #include "mjpegenc_common.h"
38 #include "mpegvideo.h"
39 #include "mjpeg.h"
40 #include "mjpegenc.h"
41 #include "profiles.h"
42
alloc_huffman(MpegEncContext * s)43 static int alloc_huffman(MpegEncContext *s)
44 {
45 MJpegContext *m = s->mjpeg_ctx;
46 size_t num_mbs, num_blocks, num_codes;
47 int blocks_per_mb;
48
49 // We need to init this here as the mjpeg init is called before the common init,
50 s->mb_width = (s->width + 15) / 16;
51 s->mb_height = (s->height + 15) / 16;
52
53 switch (s->chroma_format) {
54 case CHROMA_420: blocks_per_mb = 6; break;
55 case CHROMA_422: blocks_per_mb = 8; break;
56 case CHROMA_444: blocks_per_mb = 12; break;
57 default: av_assert0(0);
58 };
59
60 // Make sure we have enough space to hold this frame.
61 num_mbs = s->mb_width * s->mb_height;
62 num_blocks = num_mbs * blocks_per_mb;
63 num_codes = num_blocks * 64;
64
65 m->huff_buffer = av_malloc_array(num_codes, sizeof(MJpegHuffmanCode));
66 if (!m->huff_buffer)
67 return AVERROR(ENOMEM);
68 return 0;
69 }
70
ff_mjpeg_encode_init(MpegEncContext * s)71 av_cold int ff_mjpeg_encode_init(MpegEncContext *s)
72 {
73 MJpegContext *m;
74
75 av_assert0(s->slice_context_count == 1);
76
77 if (s->width > 65500 || s->height > 65500) {
78 av_log(s, AV_LOG_ERROR, "JPEG does not support resolutions above 65500x65500\n");
79 return AVERROR(EINVAL);
80 }
81
82 m = av_mallocz(sizeof(MJpegContext));
83 if (!m)
84 return AVERROR(ENOMEM);
85
86 s->min_qcoeff=-1023;
87 s->max_qcoeff= 1023;
88
89 // Build default Huffman tables.
90 // These may be overwritten later with more optimal Huffman tables, but
91 // they are needed at least right now for some processes like trellis.
92 ff_mjpeg_build_huffman_codes(m->huff_size_dc_luminance,
93 m->huff_code_dc_luminance,
94 avpriv_mjpeg_bits_dc_luminance,
95 avpriv_mjpeg_val_dc);
96 ff_mjpeg_build_huffman_codes(m->huff_size_dc_chrominance,
97 m->huff_code_dc_chrominance,
98 avpriv_mjpeg_bits_dc_chrominance,
99 avpriv_mjpeg_val_dc);
100 ff_mjpeg_build_huffman_codes(m->huff_size_ac_luminance,
101 m->huff_code_ac_luminance,
102 avpriv_mjpeg_bits_ac_luminance,
103 avpriv_mjpeg_val_ac_luminance);
104 ff_mjpeg_build_huffman_codes(m->huff_size_ac_chrominance,
105 m->huff_code_ac_chrominance,
106 avpriv_mjpeg_bits_ac_chrominance,
107 avpriv_mjpeg_val_ac_chrominance);
108
109 ff_init_uni_ac_vlc(m->huff_size_ac_luminance, m->uni_ac_vlc_len);
110 ff_init_uni_ac_vlc(m->huff_size_ac_chrominance, m->uni_chroma_ac_vlc_len);
111 s->intra_ac_vlc_length =
112 s->intra_ac_vlc_last_length = m->uni_ac_vlc_len;
113 s->intra_chroma_ac_vlc_length =
114 s->intra_chroma_ac_vlc_last_length = m->uni_chroma_ac_vlc_len;
115
116 // Buffers start out empty.
117 m->huff_ncode = 0;
118 s->mjpeg_ctx = m;
119
120 if(s->huffman == HUFFMAN_TABLE_OPTIMAL)
121 return alloc_huffman(s);
122
123 return 0;
124 }
125
ff_mjpeg_encode_close(MpegEncContext * s)126 av_cold void ff_mjpeg_encode_close(MpegEncContext *s)
127 {
128 av_freep(&s->mjpeg_ctx->huff_buffer);
129 av_freep(&s->mjpeg_ctx);
130 }
131
132 /**
133 * Add code and table_id to the JPEG buffer.
134 *
135 * @param s The MJpegContext which contains the JPEG buffer.
136 * @param table_id Which Huffman table the code belongs to.
137 * @param code The encoded exponent of the coefficients and the run-bits.
138 */
ff_mjpeg_encode_code(MJpegContext * s,uint8_t table_id,int code)139 static inline void ff_mjpeg_encode_code(MJpegContext *s, uint8_t table_id, int code)
140 {
141 MJpegHuffmanCode *c = &s->huff_buffer[s->huff_ncode++];
142 c->table_id = table_id;
143 c->code = code;
144 }
145
146 /**
147 * Add the coefficient's data to the JPEG buffer.
148 *
149 * @param s The MJpegContext which contains the JPEG buffer.
150 * @param table_id Which Huffman table the code belongs to.
151 * @param val The coefficient.
152 * @param run The run-bits.
153 */
ff_mjpeg_encode_coef(MJpegContext * s,uint8_t table_id,int val,int run)154 static void ff_mjpeg_encode_coef(MJpegContext *s, uint8_t table_id, int val, int run)
155 {
156 int mant, code;
157
158 if (val == 0) {
159 av_assert0(run == 0);
160 ff_mjpeg_encode_code(s, table_id, 0);
161 } else {
162 mant = val;
163 if (val < 0) {
164 val = -val;
165 mant--;
166 }
167
168 code = (run << 4) | (av_log2_16bit(val) + 1);
169
170 s->huff_buffer[s->huff_ncode].mant = mant;
171 ff_mjpeg_encode_code(s, table_id, code);
172 }
173 }
174
175 /**
176 * Add the block's data into the JPEG buffer.
177 *
178 * @param s The MJpegEncContext that contains the JPEG buffer.
179 * @param block The block.
180 * @param n The block's index or number.
181 */
record_block(MpegEncContext * s,int16_t * block,int n)182 static void record_block(MpegEncContext *s, int16_t *block, int n)
183 {
184 int i, j, table_id;
185 int component, dc, last_index, val, run;
186 MJpegContext *m = s->mjpeg_ctx;
187
188 /* DC coef */
189 component = (n <= 3 ? 0 : (n&1) + 1);
190 table_id = (n <= 3 ? 0 : 1);
191 dc = block[0]; /* overflow is impossible */
192 val = dc - s->last_dc[component];
193
194 ff_mjpeg_encode_coef(m, table_id, val, 0);
195
196 s->last_dc[component] = dc;
197
198 /* AC coefs */
199
200 run = 0;
201 last_index = s->block_last_index[n];
202 table_id |= 2;
203
204 for(i=1;i<=last_index;i++) {
205 j = s->intra_scantable.permutated[i];
206 val = block[j];
207
208 if (val == 0) {
209 run++;
210 } else {
211 while (run >= 16) {
212 ff_mjpeg_encode_code(m, table_id, 0xf0);
213 run -= 16;
214 }
215 ff_mjpeg_encode_coef(m, table_id, val, run);
216 run = 0;
217 }
218 }
219
220 /* output EOB only if not already 64 values */
221 if (last_index < 63 || run != 0)
222 ff_mjpeg_encode_code(m, table_id, 0);
223 }
224
encode_block(MpegEncContext * s,int16_t * block,int n)225 static void encode_block(MpegEncContext *s, int16_t *block, int n)
226 {
227 int mant, nbits, code, i, j;
228 int component, dc, run, last_index, val;
229 MJpegContext *m = s->mjpeg_ctx;
230 uint8_t *huff_size_ac;
231 uint16_t *huff_code_ac;
232
233 /* DC coef */
234 component = (n <= 3 ? 0 : (n&1) + 1);
235 dc = block[0]; /* overflow is impossible */
236 val = dc - s->last_dc[component];
237 if (n < 4) {
238 ff_mjpeg_encode_dc(&s->pb, val, m->huff_size_dc_luminance, m->huff_code_dc_luminance);
239 huff_size_ac = m->huff_size_ac_luminance;
240 huff_code_ac = m->huff_code_ac_luminance;
241 } else {
242 ff_mjpeg_encode_dc(&s->pb, val, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
243 huff_size_ac = m->huff_size_ac_chrominance;
244 huff_code_ac = m->huff_code_ac_chrominance;
245 }
246 s->last_dc[component] = dc;
247
248 /* AC coefs */
249
250 run = 0;
251 last_index = s->block_last_index[n];
252 for(i=1;i<=last_index;i++) {
253 j = s->intra_scantable.permutated[i];
254 val = block[j];
255 if (val == 0) {
256 run++;
257 } else {
258 while (run >= 16) {
259 put_bits(&s->pb, huff_size_ac[0xf0], huff_code_ac[0xf0]);
260 run -= 16;
261 }
262 mant = val;
263 if (val < 0) {
264 val = -val;
265 mant--;
266 }
267
268 nbits= av_log2_16bit(val) + 1;
269 code = (run << 4) | nbits;
270
271 put_bits(&s->pb, huff_size_ac[code], huff_code_ac[code]);
272
273 put_sbits(&s->pb, nbits, mant);
274 run = 0;
275 }
276 }
277
278 /* output EOB only if not already 64 values */
279 if (last_index < 63 || run != 0)
280 put_bits(&s->pb, huff_size_ac[0], huff_code_ac[0]);
281 }
282
ff_mjpeg_encode_mb(MpegEncContext * s,int16_t block[12][64])283 void ff_mjpeg_encode_mb(MpegEncContext *s, int16_t block[12][64])
284 {
285 int i;
286 if (s->huffman == HUFFMAN_TABLE_OPTIMAL) {
287 if (s->chroma_format == CHROMA_444) {
288 record_block(s, block[0], 0);
289 record_block(s, block[2], 2);
290 record_block(s, block[4], 4);
291 record_block(s, block[8], 8);
292 record_block(s, block[5], 5);
293 record_block(s, block[9], 9);
294
295 if (16*s->mb_x+8 < s->width) {
296 record_block(s, block[1], 1);
297 record_block(s, block[3], 3);
298 record_block(s, block[6], 6);
299 record_block(s, block[10], 10);
300 record_block(s, block[7], 7);
301 record_block(s, block[11], 11);
302 }
303 } else {
304 for(i=0;i<5;i++) {
305 record_block(s, block[i], i);
306 }
307 if (s->chroma_format == CHROMA_420) {
308 record_block(s, block[5], 5);
309 } else {
310 record_block(s, block[6], 6);
311 record_block(s, block[5], 5);
312 record_block(s, block[7], 7);
313 }
314 }
315 } else {
316 if (s->chroma_format == CHROMA_444) {
317 encode_block(s, block[0], 0);
318 encode_block(s, block[2], 2);
319 encode_block(s, block[4], 4);
320 encode_block(s, block[8], 8);
321 encode_block(s, block[5], 5);
322 encode_block(s, block[9], 9);
323
324 if (16*s->mb_x+8 < s->width) {
325 encode_block(s, block[1], 1);
326 encode_block(s, block[3], 3);
327 encode_block(s, block[6], 6);
328 encode_block(s, block[10], 10);
329 encode_block(s, block[7], 7);
330 encode_block(s, block[11], 11);
331 }
332 } else {
333 for(i=0;i<5;i++) {
334 encode_block(s, block[i], i);
335 }
336 if (s->chroma_format == CHROMA_420) {
337 encode_block(s, block[5], 5);
338 } else {
339 encode_block(s, block[6], 6);
340 encode_block(s, block[5], 5);
341 encode_block(s, block[7], 7);
342 }
343 }
344
345 s->i_tex_bits += get_bits_diff(s);
346 }
347 }
348
349 #if CONFIG_AMV_ENCODER
350 // maximum over s->mjpeg_vsample[i]
351 #define V_MAX 2
amv_encode_picture(AVCodecContext * avctx,AVPacket * pkt,const AVFrame * pic_arg,int * got_packet)352 static int amv_encode_picture(AVCodecContext *avctx, AVPacket *pkt,
353 const AVFrame *pic_arg, int *got_packet)
354 {
355 MpegEncContext *s = avctx->priv_data;
356 AVFrame *pic;
357 int i, ret;
358 int chroma_h_shift, chroma_v_shift;
359
360 av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt, &chroma_h_shift, &chroma_v_shift);
361
362 if ((avctx->height & 15) && avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
363 av_log(avctx, AV_LOG_ERROR,
364 "Heights which are not a multiple of 16 might fail with some decoders, "
365 "use vstrict=-1 / -strict -1 to use %d anyway.\n", avctx->height);
366 av_log(avctx, AV_LOG_WARNING, "If you have a device that plays AMV videos, please test if videos "
367 "with such heights work with it and report your findings to ffmpeg-devel@ffmpeg.org\n");
368 return AVERROR_EXPERIMENTAL;
369 }
370
371 pic = av_frame_clone(pic_arg);
372 if (!pic)
373 return AVERROR(ENOMEM);
374 //picture should be flipped upside-down
375 for(i=0; i < 3; i++) {
376 int vsample = i ? 2 >> chroma_v_shift : 2;
377 pic->data[i] += pic->linesize[i] * (vsample * s->height / V_MAX - 1);
378 pic->linesize[i] *= -1;
379 }
380 ret = ff_mpv_encode_picture(avctx, pkt, pic, got_packet);
381 av_frame_free(&pic);
382 return ret;
383 }
384 #endif
385
386 #define OFFSET(x) offsetof(MpegEncContext, x)
387 #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
388 static const AVOption options[] = {
389 FF_MPV_COMMON_OPTS
390 { "pred", "Prediction method", OFFSET(pred), AV_OPT_TYPE_INT, { .i64 = 1 }, 1, 3, VE, "pred" },
391 { "left", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 1 }, INT_MIN, INT_MAX, VE, "pred" },
392 { "plane", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 2 }, INT_MIN, INT_MAX, VE, "pred" },
393 { "median", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 3 }, INT_MIN, INT_MAX, VE, "pred" },
394 { "huffman", "Huffman table strategy", OFFSET(huffman), AV_OPT_TYPE_INT, { .i64 = HUFFMAN_TABLE_OPTIMAL }, 0, NB_HUFFMAN_TABLE_OPTION - 1, VE, "huffman" },
395 { "default", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = HUFFMAN_TABLE_DEFAULT }, INT_MIN, INT_MAX, VE, "huffman" },
396 { "optimal", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = HUFFMAN_TABLE_OPTIMAL }, INT_MIN, INT_MAX, VE, "huffman" },
397 { NULL},
398 };
399
400 #if CONFIG_MJPEG_ENCODER
401 static const AVClass mjpeg_class = {
402 .class_name = "mjpeg encoder",
403 .item_name = av_default_item_name,
404 .option = options,
405 .version = LIBAVUTIL_VERSION_INT,
406 };
407
408 AVCodec ff_mjpeg_encoder = {
409 .name = "mjpeg",
410 .long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
411 .type = AVMEDIA_TYPE_VIDEO,
412 .id = AV_CODEC_ID_MJPEG,
413 .priv_data_size = sizeof(MpegEncContext),
414 .init = ff_mpv_encode_init,
415 .encode2 = ff_mpv_encode_picture,
416 .close = ff_mpv_encode_end,
417 .capabilities = AV_CODEC_CAP_SLICE_THREADS | AV_CODEC_CAP_FRAME_THREADS,
418 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
419 .pix_fmts = (const enum AVPixelFormat[]) {
420 AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_NONE
421 },
422 .priv_class = &mjpeg_class,
423 .profiles = NULL_IF_CONFIG_SMALL(ff_mjpeg_profiles),
424 };
425 #endif
426
427 #if CONFIG_AMV_ENCODER
428 static const AVClass amv_class = {
429 .class_name = "amv encoder",
430 .item_name = av_default_item_name,
431 .option = options,
432 .version = LIBAVUTIL_VERSION_INT,
433 };
434
435 AVCodec ff_amv_encoder = {
436 .name = "amv",
437 .long_name = NULL_IF_CONFIG_SMALL("AMV Video"),
438 .type = AVMEDIA_TYPE_VIDEO,
439 .id = AV_CODEC_ID_AMV,
440 .priv_data_size = sizeof(MpegEncContext),
441 .init = ff_mpv_encode_init,
442 .encode2 = amv_encode_picture,
443 .close = ff_mpv_encode_end,
444 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
445 .pix_fmts = (const enum AVPixelFormat[]) {
446 AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_NONE
447 },
448 .priv_class = &amv_class,
449 };
450 #endif
451