summaryrefslogtreecommitdiffstats
path: root/libavcodec/utvideoenc.c
blob: 9af0f66a71371819921f5f76562ee5c755831289 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
/*
 * Ut Video encoder
 * Copyright (c) 2012 Jan Ekström
 *
 * This file is part of Libav.
 *
 * Libav is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * Libav is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with Libav; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * Ut Video encoder
 */

#include "libavutil/imgutils.h"
#include "libavutil/intreadwrite.h"
#include "avcodec.h"
#include "internal.h"
#include "bswapdsp.h"
#include "bytestream.h"
#include "put_bits.h"
#include "huffyuvencdsp.h"
#include "mathops.h"
#include "utvideo.h"
#include "huffman.h"

/* Compare huffentry symbols */
static int huff_cmp_sym(const void *a, const void *b)
{
    const HuffEntry *aa = a, *bb = b;
    return aa->sym - bb->sym;
}

static av_cold int utvideo_encode_close(AVCodecContext *avctx)
{
    UtvideoContext *c = avctx->priv_data;
    int i;

    av_freep(&c->slice_bits);
    for (i = 0; i < 4; i++)
        av_freep(&c->slice_buffer[i]);

    return 0;
}

static av_cold int utvideo_encode_init(AVCodecContext *avctx)
{
    UtvideoContext *c = avctx->priv_data;
    int i, subsampled_height;
    uint32_t original_format;

    c->avctx           = avctx;
    c->frame_info_size = 4;
    c->slice_stride    = FFALIGN(avctx->width, 32);

    switch (avctx->pix_fmt) {
    case AV_PIX_FMT_RGB24:
        c->planes        = 3;
        avctx->codec_tag = MKTAG('U', 'L', 'R', 'G');
        original_format  = UTVIDEO_RGB;
        break;
    case AV_PIX_FMT_RGBA:
        c->planes        = 4;
        avctx->codec_tag = MKTAG('U', 'L', 'R', 'A');
        original_format  = UTVIDEO_RGBA;
        break;
    case AV_PIX_FMT_YUV420P:
        if (avctx->width & 1 || avctx->height & 1) {
            av_log(avctx, AV_LOG_ERROR,
                   "4:2:0 video requires even width and height.\n");
            return AVERROR_INVALIDDATA;
        }
        c->planes        = 3;
        if (avctx->colorspace == AVCOL_SPC_BT709)
            avctx->codec_tag = MKTAG('U', 'L', 'H', '0');
        else
            avctx->codec_tag = MKTAG('U', 'L', 'Y', '0');
        original_format  = UTVIDEO_420;
        break;
    case AV_PIX_FMT_YUV422P:
        if (avctx->width & 1) {
            av_log(avctx, AV_LOG_ERROR,
                   "4:2:2 video requires even width.\n");
            return AVERROR_INVALIDDATA;
        }
        c->planes        = 3;
        if (avctx->colorspace == AVCOL_SPC_BT709)
            avctx->codec_tag = MKTAG('U', 'L', 'H', '2');
        else
            avctx->codec_tag = MKTAG('U', 'L', 'Y', '2');
        original_format  = UTVIDEO_422;
        break;
    default:
        av_log(avctx, AV_LOG_ERROR, "Unknown pixel format: %d\n",
               avctx->pix_fmt);
        return AVERROR_INVALIDDATA;
    }

    ff_bswapdsp_init(&c->bdsp);
    ff_huffyuvencdsp_init(&c->hdsp);

    /* Check the prediction method, and error out if unsupported */
    if (avctx->prediction_method < 0 || avctx->prediction_method > 4) {
        av_log(avctx, AV_LOG_WARNING,
               "Prediction method %d is not supported in Ut Video.\n",
               avctx->prediction_method);
        return AVERROR_OPTION_NOT_FOUND;
    }

    if (avctx->prediction_method == FF_PRED_PLANE) {
        av_log(avctx, AV_LOG_ERROR,
               "Plane prediction is not supported in Ut Video.\n");
        return AVERROR_OPTION_NOT_FOUND;
    }

    /* Convert from libavcodec prediction type to Ut Video's */
    c->frame_pred = ff_ut_pred_order[avctx->prediction_method];

    if (c->frame_pred == PRED_GRADIENT) {
        av_log(avctx, AV_LOG_ERROR, "Gradient prediction is not supported.\n");
        return AVERROR_OPTION_NOT_FOUND;
    }

    /*
     * Check the asked slice count for obviously invalid
     * values (> 256 or negative).
     */
    if (avctx->slices > 256 || avctx->slices < 0) {
        av_log(avctx, AV_LOG_ERROR,
               "Slice count %d is not supported in Ut Video (theoretical range is 0-256).\n",
               avctx->slices);
        return AVERROR(EINVAL);
    }

    /* Check that the slice count is not larger than the subsampled height */
    subsampled_height = avctx->height >> av_pix_fmt_desc_get(avctx->pix_fmt)->log2_chroma_h;
    if (avctx->slices > subsampled_height) {
        av_log(avctx, AV_LOG_ERROR,
               "Slice count %d is larger than the subsampling-applied height %d.\n",
               avctx->slices, subsampled_height);
        return AVERROR(EINVAL);
    }

    /* extradata size is 4 * 32bit */
    avctx->extradata_size = 16;

    avctx->extradata = av_mallocz(avctx->extradata_size +
                                  AV_INPUT_BUFFER_PADDING_SIZE);

    if (!avctx->extradata) {
        av_log(avctx, AV_LOG_ERROR, "Could not allocate extradata.\n");
        utvideo_encode_close(avctx);
        return AVERROR(ENOMEM);
    }

    for (i = 0; i < c->planes; i++) {
        c->slice_buffer[i] = av_malloc(c->slice_stride * (avctx->height + 2) +
                                       AV_INPUT_BUFFER_PADDING_SIZE);
        if (!c->slice_buffer[i]) {
            av_log(avctx, AV_LOG_ERROR, "Cannot allocate temporary buffer 1.\n");
            utvideo_encode_close(avctx);
            return AVERROR(ENOMEM);
        }
    }

    /*
     * Set the version of the encoder.
     * Last byte is "implementation ID", which is
     * obtained from the creator of the format.
     * Libavcodec has been assigned with the ID 0xF0.
     */
    AV_WB32(avctx->extradata, MKTAG(1, 0, 0, 0xF0));

    /*
     * Set the "original format"
     * Not used for anything during decoding.
     */
    AV_WL32(avctx->extradata + 4, original_format);

    /* Write 4 as the 'frame info size' */
    AV_WL32(avctx->extradata + 8, c->frame_info_size);

    /*
     * Set how many slices are going to be used.
     * By default uses multiple slices depending on the subsampled height.
     * This enables multithreading in the official decoder.
     */
    if (!avctx->slices) {
        c->slices = subsampled_height / 120;

        if (!c->slices)
            c->slices = 1;
        else if (c->slices > 256)
            c->slices = 256;
    } else {
        c->slices = avctx->slices;
    }

    /* Set compression mode */
    c->compression = COMP_HUFF;

    /*
     * Set the encoding flags:
     * - Slice count minus 1
     * - Interlaced encoding mode flag, set to zero for now.
     * - Compression mode (none/huff)
     * And write the flags.
     */
    c->flags  = (c->slices - 1) << 24;
    c->flags |= 0 << 11; // bit field to signal interlaced encoding mode
    c->flags |= c->compression;

    AV_WL32(avctx->extradata + 12, c->flags);

    return 0;
}

static void mangle_rgb_planes(uint8_t *dst[4], int dst_stride, uint8_t *src,
                              int step, int stride, int width, int height)
{
    int i, j;
    int k = 2 * dst_stride;
    unsigned int g;

    for (j = 0; j < height; j++) {
        if (step == 3) {
            for (i = 0; i < width * step; i += step) {
                g         = src[i + 1];
                dst[0][k] = g;
                g        += 0x80;
                dst[1][k] = src[i + 2] - g;
                dst[2][k] = src[i + 0] - g;
                k++;
            }
        } else {
            for (i = 0; i < width * step; i += step) {
                g         = src[i + 1];
                dst[0][k] = g;
                g        += 0x80;
                dst[1][k] = src[i + 2] - g;
                dst[2][k] = src[i + 0] - g;
                dst[3][k] = src[i + 3];
                k++;
            }
        }
        k += dst_stride - width;
        src += stride;
    }
}

/* Write data to a plane with left prediction */
static void left_predict(uint8_t *src, uint8_t *dst, int stride,
                         int width, int height)
{
    int i, j;
    uint8_t prev;

    prev = 0x80; /* Set the initial value */
    for (j = 0; j < height; j++) {
        for (i = 0; i < width; i++) {
            *dst++ = src[i] - prev;
            prev   = src[i];
        }
        src += stride;
    }
}

/* Write data to a plane with median prediction */
static void median_predict(UtvideoContext *c, uint8_t *src, uint8_t *dst, int stride,
                           int width, int height)
{
    int i, j;
    int A, B;
    uint8_t prev;

    /* First line uses left neighbour prediction */
    prev = 0x80; /* Set the initial value */
    for (i = 0; i < width; i++) {
        *dst++ = src[i] - prev;
        prev   = src[i];
    }

    if (height == 1)
        return;

    src += stride;

    /*
     * Second line uses top prediction for the first sample,
     * and median for the rest.
     */
    A = B = 0;

    /* Rest of the coded part uses median prediction */
    for (j = 1; j < height; j++) {
        c->hdsp.sub_hfyu_median_pred(dst, src - stride, src, width, &A, &B);
        dst += width;
        src += stride;
    }
}

/* Count the usage of values in a plane */
static void count_usage(uint8_t *src, int width,
                        int height, uint64_t *counts)
{
    int i, j;

    for (j = 0; j < height; j++) {
        for (i = 0; i < width; i++) {
            counts[src[i]]++;
        }
        src += width;
    }
}

/* Calculate the actual huffman codes from the code lengths */
static void calculate_codes(HuffEntry *he)
{
    int last, i;
    uint32_t code;

    qsort(he, 256, sizeof(*he), ff_ut_huff_cmp_len);

    last = 255;
    while (he[last].len == 255 && last)
        last--;

    code = 1;
    for (i = last; i >= 0; i--) {
        he[i].code  = code >> (32 - he[i].len);
        code       += 0x80000000u >> (he[i].len - 1);
    }

    qsort(he, 256, sizeof(*he), huff_cmp_sym);
}

/* Write huffman bit codes to a memory block */
static int write_huff_codes(uint8_t *src, uint8_t *dst, int dst_size,
                            int width, int height, HuffEntry *he)
{
    PutBitContext pb;
    int i, j;
    int count;

    init_put_bits(&pb, dst, dst_size);

    /* Write the codes */
    for (j = 0; j < height; j++) {
        for (i = 0; i < width; i++)
            put_bits(&pb, he[src[i]].len, he[src[i]].code);

        src += width;
    }

    /* Pad output to a 32bit boundary */
    count = put_bits_count(&pb) & 0x1F;

    if (count)
        put_bits(&pb, 32 - count, 0);

    /* Get the amount of bits written */
    count = put_bits_count(&pb);

    /* Flush the rest with zeroes */
    flush_put_bits(&pb);

    return count;
}

static int encode_plane(AVCodecContext *avctx, uint8_t *src,
                        uint8_t *dst, int stride,
                        int width, int height, PutByteContext *pb)
{
    UtvideoContext *c        = avctx->priv_data;
    uint8_t  lengths[256];
    uint64_t counts[256]     = { 0 };

    HuffEntry he[256];

    uint32_t offset = 0, slice_len = 0;
    int      i, sstart, send = 0;
    int      symbol;

    /* Do prediction / make planes */
    switch (c->frame_pred) {
    case PRED_NONE:
        for (i = 0; i < c->slices; i++) {
            sstart = send;
            send   = height * (i + 1) / c->slices;
            av_image_copy_plane(dst + sstart * width, width,
                                src + sstart * stride, stride,
                                width, send - sstart);
        }
        break;
    case PRED_LEFT:
        for (i = 0; i < c->slices; i++) {
            sstart = send;
            send   = height * (i + 1) / c->slices;
            left_predict(src + sstart * stride, dst + sstart * width,
                         stride, width, send - sstart);
        }
        break;
    case PRED_MEDIAN:
        for (i = 0; i < c->slices; i++) {
            sstart = send;
            send   = height * (i + 1) / c->slices;
            median_predict(c, src + sstart * stride, dst + sstart * width,
                           stride, width, send - sstart);
        }
        break;
    default:
        av_log(avctx, AV_LOG_ERROR, "Unknown prediction mode: %d\n",
               c->frame_pred);
        return AVERROR_OPTION_NOT_FOUND;
    }

    /* Count the usage of values */
    count_usage(dst, width, height, counts);

    /* Check for a special case where only one symbol was used */
    for (symbol = 0; symbol < 256; symbol++) {
        /* If non-zero count is found, see if it matches width * height */
        if (counts[symbol]) {
            /* Special case if only one symbol was used */
            if (counts[symbol] == width * height) {
                /*
                 * Write a zero for the single symbol
                 * used in the plane, else 0xFF.
                 */
                for (i = 0; i < 256; i++) {
                    if (i == symbol)
                        bytestream2_put_byte(pb, 0);
                    else
                        bytestream2_put_byte(pb, 0xFF);
                }

                /* Write zeroes for lengths */
                for (i = 0; i < c->slices; i++)
                    bytestream2_put_le32(pb, 0);

                /* And that's all for that plane folks */
                return 0;
            }
            break;
        }
    }

    /* Calculate huffman lengths */
    ff_huff_gen_len_table(lengths, counts);

    /*
     * Write the plane's header into the output packet:
     * - huffman code lengths (256 bytes)
     * - slice end offsets (gotten from the slice lengths)
     */
    for (i = 0; i < 256; i++) {
        bytestream2_put_byte(pb, lengths[i]);

        he[i].len = lengths[i];
        he[i].sym = i;
    }

    /* Calculate the huffman codes themselves */
    calculate_codes(he);

    send = 0;
    for (i = 0; i < c->slices; i++) {
        sstart  = send;
        send    = height * (i + 1) / c->slices;

        /*
         * Write the huffman codes to a buffer,
         * get the offset in bits and convert to bytes.
         */
        offset += write_huff_codes(dst + sstart * width, c->slice_bits,
                                   width * (send - sstart), width,
                                   send - sstart, he) >> 3;

        slice_len = offset - slice_len;

        /* Byteswap the written huffman codes */
        c->bdsp.bswap_buf((uint32_t *) c->slice_bits,
                          (uint32_t *) c->slice_bits,
                          slice_len >> 2);

        /* Write the offset to the stream */
        bytestream2_put_le32(pb, offset);

        /* Seek to the data part of the packet */
        bytestream2_seek_p(pb, 4 * (c->slices - i - 1) +
                           offset - slice_len, SEEK_CUR);

        /* Write the slices' data into the output packet */
        bytestream2_put_buffer(pb, c->slice_bits, slice_len);

        /* Seek back to the slice offsets */
        bytestream2_seek_p(pb, -4 * (c->slices - i - 1) - offset,
                           SEEK_CUR);

        slice_len = offset;
    }

    /* And at the end seek to the end of written slice(s) */
    bytestream2_seek_p(pb, offset, SEEK_CUR);

    return 0;
}

static int utvideo_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
                                const AVFrame *pic, int *got_packet)
{
    UtvideoContext *c = avctx->priv_data;
    PutByteContext pb;

    uint32_t frame_info;

    uint8_t *dst;

    int width = avctx->width, height = avctx->height;
    int i, ret = 0;

    /* Allocate a new packet if needed, and set it to the pointer dst */
    ret = ff_alloc_packet(pkt, (256 + 4 * c->slices + width * height) *
                          c->planes + 4);

    if (ret < 0) {
        av_log(avctx, AV_LOG_ERROR,
               "Error allocating the output packet, or the provided packet "
               "was too small.\n");
        return ret;
    }

    dst = pkt->data;

    bytestream2_init_writer(&pb, dst, pkt->size);

    av_fast_malloc(&c->slice_bits, &c->slice_bits_size,
                   width * height + AV_INPUT_BUFFER_PADDING_SIZE);

    if (!c->slice_bits) {
        av_log(avctx, AV_LOG_ERROR, "Cannot allocate temporary buffer 2.\n");
        return AVERROR(ENOMEM);
    }

    /* In case of RGB, mangle the planes to Ut Video's format */
    if (avctx->pix_fmt == AV_PIX_FMT_RGBA || avctx->pix_fmt == AV_PIX_FMT_RGB24)
        mangle_rgb_planes(c->slice_buffer, c->slice_stride, pic->data[0],
                          c->planes, pic->linesize[0], width, height);

    /* Deal with the planes */
    switch (avctx->pix_fmt) {
    case AV_PIX_FMT_RGB24:
    case AV_PIX_FMT_RGBA:
        for (i = 0; i < c->planes; i++) {
            ret = encode_plane(avctx, c->slice_buffer[i] + 2 * c->slice_stride,
                               c->slice_buffer[i], c->slice_stride,
                               width, height, &pb);

            if (ret) {
                av_log(avctx, AV_LOG_ERROR, "Error encoding plane %d.\n", i);
                return ret;
            }
        }
        break;
    case AV_PIX_FMT_YUV422P:
        for (i = 0; i < c->planes; i++) {
            ret = encode_plane(avctx, pic->data[i], c->slice_buffer[0],
                               pic->linesize[i], width >> !!i, height, &pb);

            if (ret) {
                av_log(avctx, AV_LOG_ERROR, "Error encoding plane %d.\n", i);
                return ret;
            }
        }
        break;
    case AV_PIX_FMT_YUV420P:
        for (i = 0; i < c->planes; i++) {
            ret = encode_plane(avctx, pic->data[i], c->slice_buffer[0],
                               pic->linesize[i], width >> !!i, height >> !!i,
                               &pb);

            if (ret) {
                av_log(avctx, AV_LOG_ERROR, "Error encoding plane %d.\n", i);
                return ret;
            }
        }
        break;
    default:
        av_log(avctx, AV_LOG_ERROR, "Unknown pixel format: %d\n",
               avctx->pix_fmt);
        return AVERROR_INVALIDDATA;
    }

    /*
     * Write frame information (LE 32bit unsigned)
     * into the output packet.
     * Contains the prediction method.
     */
    frame_info = c->frame_pred << 8;
    bytestream2_put_le32(&pb, frame_info);

    /*
     * At least currently Ut Video is IDR only.
     * Set flags accordingly.
     */
#if FF_API_CODED_FRAME
FF_DISABLE_DEPRECATION_WARNINGS
    avctx->coded_frame->key_frame = 1;
    avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
FF_ENABLE_DEPRECATION_WARNINGS
#endif

    pkt->size   = bytestream2_tell_p(&pb);
    pkt->flags |= AV_PKT_FLAG_KEY;

    /* Packet should be done */
    *got_packet = 1;

    return 0;
}

AVCodec ff_utvideo_encoder = {
    .name           = "utvideo",
    .long_name      = NULL_IF_CONFIG_SMALL("Ut Video"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_UTVIDEO,
    .priv_data_size = sizeof(UtvideoContext),
    .init           = utvideo_encode_init,
    .encode2        = utvideo_encode_frame,
    .close          = utvideo_encode_close,
    .pix_fmts       = (const enum AVPixelFormat[]) {
                          AV_PIX_FMT_RGB24, AV_PIX_FMT_RGBA, AV_PIX_FMT_YUV422P,
                          AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE
                      },
};
OpenPOWER on IntegriCloud