summaryrefslogtreecommitdiff
path: root/libavcodec/speedhqenc.c
blob: 6ff7b447a0f01ec2e95dae7ec8845a335328751a (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
/*
 * SpeedHQ encoder
 * Copyright (c) 2000, 2001 Fabrice Bellard
 * Copyright (c) 2003 Alex Beregszaszi
 * Copyright (c) 2003-2004 Michael Niedermayer
 * Copyright (c) 2020 FFmpeg
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg 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.
 *
 * FFmpeg 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 FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * SpeedHQ encoder.
 */

#include "libavutil/pixdesc.h"
#include "libavutil/thread.h"

#include "avcodec.h"
#include "mpeg12.h"
#include "mpegvideo.h"
#include "speedhqenc.h"

extern RLTable ff_rl_speedhq;
static uint8_t speedhq_static_rl_table_store[2][2*MAX_RUN + MAX_LEVEL + 3];

static uint16_t mpeg12_vlc_dc_lum_code_reversed[12];
static uint16_t mpeg12_vlc_dc_chroma_code_reversed[12];

/* simple include everything table for dc, first byte is bits
 * number next 3 are code */
static uint32_t speedhq_lum_dc_uni[512];
static uint32_t speedhq_chr_dc_uni[512];

static uint8_t uni_speedhq_ac_vlc_len[64 * 64 * 2];

static uint32_t reverse(uint32_t num, int bits)
{
    return bitswap_32(num) >> (32 - bits);
}

static void reverse_code(const uint16_t *code, const uint8_t *bits,
                         uint16_t *reversed_code, int num_entries)
{
    for (int i = 0; i < num_entries; i++)
        reversed_code[i] = reverse(code[i], bits[i]);
}

static av_cold void speedhq_init_static_data(void)
{
    /* Exactly the same as MPEG-2, except little-endian. */
    reverse_code(ff_mpeg12_vlc_dc_lum_code,
                 ff_mpeg12_vlc_dc_lum_bits,
                 mpeg12_vlc_dc_lum_code_reversed,
                 12);
    reverse_code(ff_mpeg12_vlc_dc_chroma_code,
                 ff_mpeg12_vlc_dc_chroma_bits,
                 mpeg12_vlc_dc_chroma_code_reversed,
                 12);

    ff_rl_init(&ff_rl_speedhq, speedhq_static_rl_table_store);

    /* build unified dc encoding tables */
    for (int i = -255; i < 256; i++) {
        int adiff, index;
        int bits, code;
        int diff = i;

        adiff = FFABS(diff);
        if (diff < 0)
            diff--;
        index = av_log2(2 * adiff);

        bits = ff_mpeg12_vlc_dc_lum_bits[index] + index;
        code = mpeg12_vlc_dc_lum_code_reversed[index] +
                (av_mod_uintp2(diff, index) << ff_mpeg12_vlc_dc_lum_bits[index]);
        speedhq_lum_dc_uni[i + 255] = bits + (code << 8);

        bits = ff_mpeg12_vlc_dc_chroma_bits[index] + index;
        code = mpeg12_vlc_dc_chroma_code_reversed[index] +
                (av_mod_uintp2(diff, index) << ff_mpeg12_vlc_dc_chroma_bits[index]);
        speedhq_chr_dc_uni[i + 255] = bits + (code << 8);
    }

    ff_mpeg1_init_uni_ac_vlc(&ff_rl_speedhq, uni_speedhq_ac_vlc_len);
}

av_cold int ff_speedhq_encode_init(MpegEncContext *s)
{
    static AVOnce init_static_once = AV_ONCE_INIT;

    av_assert0(s->slice_context_count == 1);

    if (s->width > 65500 || s->height > 65500) {
        av_log(s, AV_LOG_ERROR, "SpeedHQ does not support resolutions above 65500x65500\n");
        return AVERROR(EINVAL);
    }

    s->min_qcoeff = -2048;
    s->max_qcoeff = 2047;

    ff_thread_once(&init_static_once, speedhq_init_static_data);

    s->intra_ac_vlc_length      =
    s->intra_ac_vlc_last_length =
    s->intra_chroma_ac_vlc_length      =
    s->intra_chroma_ac_vlc_last_length = uni_speedhq_ac_vlc_len;

    switch (s->avctx->pix_fmt) {
    case AV_PIX_FMT_YUV420P:
        s->avctx->codec_tag = MKTAG('S','H','Q','0');
        break;
    case AV_PIX_FMT_YUV422P:
        s->avctx->codec_tag = MKTAG('S','H','Q','2');
        break;
    case AV_PIX_FMT_YUV444P:
        s->avctx->codec_tag = MKTAG('S','H','Q','4');
        break;
    default:
        av_assert0(0);
    }

    return 0;
}

void ff_speedhq_encode_picture_header(MpegEncContext *s)
{
    put_bits_le(&s->pb, 8, 100 - s->qscale * 2);  /* FIXME why doubled */
    put_bits_le(&s->pb, 24, 4);  /* no second field */

    /* length of first slice, will be filled out later */
    s->slice_start = 4;
    put_bits_le(&s->pb, 24, 0);
}

void ff_speedhq_end_slice(MpegEncContext *s)
{
    int slice_len;

    flush_put_bits_le(&s->pb);
    slice_len = s->pb.buf_ptr - (s->pb.buf + s->slice_start);
    AV_WL24(s->pb.buf + s->slice_start, slice_len);

    /* length of next slice, will be filled out later */
    s->slice_start = s->pb.buf_ptr - s->pb.buf;
    put_bits_le(&s->pb, 24, 0);
}

static inline void encode_dc(PutBitContext *pb, int diff, int component)
{
    unsigned int diff_u = diff + 255;
    if (diff_u >= 511) {
        int index;

        if (diff < 0) {
            index = av_log2_16bit(-2 * diff);
            diff--;
        } else {
            index = av_log2_16bit(2 * diff);
        }
        if (component == 0)
            put_bits_le(pb,
                        ff_mpeg12_vlc_dc_lum_bits[index] + index,
                        mpeg12_vlc_dc_lum_code_reversed[index] +
                        (av_mod_uintp2(diff, index) << ff_mpeg12_vlc_dc_lum_bits[index]));
        else
            put_bits_le(pb,
                        ff_mpeg12_vlc_dc_chroma_bits[index] + index,
                        mpeg12_vlc_dc_chroma_code_reversed[index] +
                        (av_mod_uintp2(diff, index) << ff_mpeg12_vlc_dc_chroma_bits[index]));
    } else {
        if (component == 0)
            put_bits_le(pb,
                        speedhq_lum_dc_uni[diff + 255] & 0xFF,
                        speedhq_lum_dc_uni[diff + 255] >> 8);
        else
            put_bits_le(pb,
                        speedhq_chr_dc_uni[diff + 255] & 0xFF,
                        speedhq_chr_dc_uni[diff + 255] >> 8);
    }
}

static void encode_block(MpegEncContext *s, int16_t *block, int n)
{
    int alevel, level, last_non_zero, dc, i, j, run, last_index, sign;
    int code;
    int component, val;

    /* DC coef */
    component = (n <= 3 ? 0 : (n&1) + 1);
    dc = block[0]; /* overflow is impossible */
    val = s->last_dc[component] - dc;  /* opposite of most codecs */
    encode_dc(&s->pb, val, component);
    s->last_dc[component] = dc;

    /* now quantify & encode AC coefs */
    last_non_zero = 0;
    last_index = s->block_last_index[n];

    for (i = 1; i <= last_index; i++) {
        j     = s->intra_scantable.permutated[i];
        level = block[j];

        /* encode using VLC */
        if (level != 0) {
            run = i - last_non_zero - 1;

            alevel = level;
            MASK_ABS(sign, alevel);
            sign &= 1;

            if (alevel <= ff_rl_speedhq.max_level[0][run]) {
                code = ff_rl_speedhq.index_run[0][run] + alevel - 1;
                /* store the VLC & sign at once */
                put_bits_le(&s->pb, ff_rl_speedhq.table_vlc[code][1] + 1,
                            ff_rl_speedhq.table_vlc[code][0] + (sign << ff_rl_speedhq.table_vlc[code][1]));
            } else {
                /* escape seems to be pretty rare <5% so I do not optimize it */
                put_bits_le(&s->pb, ff_rl_speedhq.table_vlc[121][1], ff_rl_speedhq.table_vlc[121][0]);
                /* escape: only clip in this case */
                put_bits_le(&s->pb, 6, run);
                put_bits_le(&s->pb, 12, level + 2048);
            }
            last_non_zero = i;
        }
    }
    /* end of block */
    put_bits_le(&s->pb, ff_rl_speedhq.table_vlc[122][1], ff_rl_speedhq.table_vlc[122][0]);
}

void ff_speedhq_encode_mb(MpegEncContext *s, int16_t block[12][64])
{
    int i;
    for(i=0;i<6;i++) {
        encode_block(s, block[i], i);
    }
    if (s->chroma_format == CHROMA_444) {
        encode_block(s, block[8], 8);
        encode_block(s, block[9], 9);

        encode_block(s, block[6], 6);
        encode_block(s, block[7], 7);

        encode_block(s, block[10], 10);
        encode_block(s, block[11], 11);
    } else if (s->chroma_format == CHROMA_422) {
        encode_block(s, block[6], 6);
        encode_block(s, block[7], 7);
    }

    s->i_tex_bits += get_bits_diff(s);
}

static int ff_speedhq_mb_rows_in_slice(int slice_num, int mb_height)
{
    return mb_height / 4 + (slice_num < (mb_height % 4));
}

int ff_speedhq_mb_y_order_to_mb(int mb_y_order, int mb_height, int *first_in_slice)
{
    int slice_num = 0;
    while (mb_y_order >= ff_speedhq_mb_rows_in_slice(slice_num, mb_height)) {
         mb_y_order -= ff_speedhq_mb_rows_in_slice(slice_num, mb_height);
         slice_num++;
    }
    *first_in_slice = (mb_y_order == 0);
    return mb_y_order * 4 + slice_num;
}

#if CONFIG_SPEEDHQ_ENCODER
static const AVClass speedhq_class = {
    .class_name = "speedhq encoder",
    .item_name  = av_default_item_name,
    .option     = ff_mpv_generic_options,
    .version    = LIBAVUTIL_VERSION_INT,
};

const AVCodec ff_speedhq_encoder = {
    .name           = "speedhq",
    .long_name      = NULL_IF_CONFIG_SMALL("NewTek SpeedHQ"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_SPEEDHQ,
    .priv_data_size = sizeof(MpegEncContext),
    .init           = ff_mpv_encode_init,
    .encode2        = ff_mpv_encode_picture,
    .close          = ff_mpv_encode_end,
    .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,
    .pix_fmts       = (const enum AVPixelFormat[]) {
        AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P,
        AV_PIX_FMT_NONE
    },
    .priv_class     = &speedhq_class,
};
#endif