3 * Copyright (c) 2016 Paul B Mahol
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 #include "libavutil/imgutils.h"
25 #include "libavutil/intmath.h"
26 #include "libavutil/opt.h"
29 #include "bytestream.h"
40 typedef struct SubBand {
41 unsigned width, height;
46 typedef struct PixletContext {
58 int64_t scaling[4][2][NB_LEVELS];
59 SubBand band[4][NB_LEVELS * 3 + 1];
62 static int init_decoder(AVCodecContext *avctx)
64 PixletContext *ctx = avctx->priv_data;
67 ctx->filter[0] = av_malloc_array(ctx->h, sizeof(int16_t));
68 ctx->filter[1] = av_malloc_array(FFMAX(ctx->h, ctx->w) + 16, sizeof(int16_t));
69 ctx->prediction = av_malloc_array((ctx->w >> NB_LEVELS), sizeof(int16_t));
70 if (!ctx->filter[0] || !ctx->filter[1] || !ctx->prediction)
71 return AVERROR(ENOMEM);
73 for (plane = 0; plane < 3; plane++) {
74 unsigned shift = plane > 0;
75 unsigned w = ctx->w >> shift;
76 unsigned h = ctx->h >> shift;
78 ctx->band[plane][0].width = w >> NB_LEVELS;
79 ctx->band[plane][0].height = h >> NB_LEVELS;
80 ctx->band[plane][0].size = (w >> NB_LEVELS) * (h >> NB_LEVELS);
82 for (i = 0; i < NB_LEVELS * 3; i++) {
83 unsigned scale = ctx->levels - (i / 3);
85 ctx->band[plane][i + 1].width = w >> scale;
86 ctx->band[plane][i + 1].height = h >> scale;
87 ctx->band[plane][i + 1].size = (w >> scale) * (h >> scale);
89 ctx->band[plane][i + 1].x = (w >> scale) * (((i + 1) % 3) != 2);
90 ctx->band[plane][i + 1].y = (h >> scale) * (((i + 1) % 3) != 1);
97 static void free_buffers(AVCodecContext *avctx)
99 PixletContext *ctx = avctx->priv_data;
101 av_freep(&ctx->filter[0]);
102 av_freep(&ctx->filter[1]);
103 av_freep(&ctx->prediction);
106 static av_cold int pixlet_close(AVCodecContext *avctx)
108 PixletContext *ctx = avctx->priv_data;
115 static av_cold int pixlet_init(AVCodecContext *avctx)
117 avctx->pix_fmt = AV_PIX_FMT_YUV420P16;
118 avctx->color_range = AVCOL_RANGE_JPEG;
122 static int read_low_coeffs(AVCodecContext *avctx, int16_t *dst, int size, int width, ptrdiff_t stride)
124 PixletContext *ctx = avctx->priv_data;
125 GetBitContext *b = &ctx->gbit;
126 unsigned cnt1, nbits, k, j = 0, i = 0;
127 int64_t value, state = 3;
128 int rlen, escape, flag = 0;
131 nbits = FFMIN(ff_clz((state >> 8) + 3) ^ 0x1F, 14);
133 cnt1 = get_unary(b, 0, 8);
135 value = show_bits(b, nbits);
137 skip_bits(b, nbits - 1);
138 escape = ((1 << nbits) - 1) * cnt1;
141 escape = value + ((1 << nbits) - 1) * cnt1 - 1;
144 escape = get_bits(b, 16);
147 value = -((escape + flag) & 1) | 1;
148 dst[j++] = value * ((escape + flag + 1) >> 1);
154 state = 120 * (escape + flag) + state - (120 * state >> 8);
157 if (state * 4ULL > 0xFF || i >= size)
160 nbits = ((state + 8) >> 5) + (state ? ff_clz(state) : 32) - 24;
161 escape = av_mod_uintp2(16383, nbits);
162 cnt1 = get_unary(b, 0, 8);
164 rlen = get_bits(b, 16);
166 value = show_bits(b, nbits);
169 rlen = value + escape * cnt1 - 1;
171 skip_bits(b, nbits - 1);
172 rlen = escape * cnt1;
177 return AVERROR_INVALIDDATA;
180 for (k = 0; k < rlen; k++) {
189 flag = rlen < 0xFFFF ? 1 : 0;
193 return get_bits_count(b) >> 3;
196 static int read_high_coeffs(AVCodecContext *avctx, uint8_t *src, int16_t *dst, int size,
198 int width, ptrdiff_t stride)
200 PixletContext *ctx = avctx->priv_data;
201 GetBitContext *b = &ctx->gbit;
202 unsigned cnt1, shbits, rlen, nbits, length, i = 0, j = 0, k;
203 int ret, escape, pfx, value, yflag, xflag, flag = 0;
204 int64_t state = 3, tmp;
206 if ((ret = init_get_bits8(b, src, bytestream2_get_bytes_left(&ctx->gb))) < 0)
209 if ((a >= 0) + (a ^ (a >> 31)) - (a >> 31) != 1) {
210 nbits = 33 - ff_clz((a >= 0) + (a ^ (a >> 31)) - (a >> 31) - 1);
212 return AVERROR_INVALIDDATA;
220 if (state >> 8 != -3) {
221 value = ff_clz((state >> 8) + 3) ^ 0x1F;
226 cnt1 = get_unary(b, 0, length);
228 if (cnt1 >= length) {
229 cnt1 = get_bits(b, nbits);
231 pfx = 14 + ((((uint64_t)(value - 14)) >> 32) & (value - 14));
232 if (pfx < 1 || pfx > 25)
233 return AVERROR_INVALIDDATA;
234 cnt1 *= (1 << pfx) - 1;
235 shbits = show_bits(b, pfx);
237 skip_bits(b, pfx - 1);
247 if (flag + cnt1 == 0) {
251 tmp = (int64_t)c * ((yflag + 1) >> 1) + (c >> 1);
252 value = xflag + (tmp ^ -xflag);
261 state += (int64_t)d * (uint64_t)yflag - ((int64_t)(d * (uint64_t)state) >> 8);
265 if (state * 4ULL > 0xFF || i >= size)
268 pfx = ((state + 8) >> 5) + (state ? ff_clz(state): 32) - 24;
269 escape = av_mod_uintp2(16383, pfx);
270 cnt1 = get_unary(b, 0, 8);
272 if (pfx < 1 || pfx > 25)
273 return AVERROR_INVALIDDATA;
274 value = show_bits(b, pfx);
277 rlen = value + escape * cnt1 - 1;
279 skip_bits(b, pfx - 1);
280 rlen = escape * cnt1;
284 value = get_bits(b, 16);
286 value = get_bits(b, 8);
288 rlen = value + 8 * escape;
291 if (rlen > 0xFFFF || i + rlen > size)
292 return AVERROR_INVALIDDATA;
295 for (k = 0; k < rlen; k++) {
304 flag = rlen < 0xFFFF ? 1 : 0;
308 return get_bits_count(b) >> 3;
311 static int read_highpass(AVCodecContext *avctx, uint8_t *ptr, int plane, AVFrame *frame)
313 PixletContext *ctx = avctx->priv_data;
314 ptrdiff_t stride = frame->linesize[plane] / 2;
317 for (i = 0; i < ctx->levels * 3; i++) {
318 int32_t a = bytestream2_get_be32(&ctx->gb);
319 int32_t b = bytestream2_get_be32(&ctx->gb);
320 int32_t c = bytestream2_get_be32(&ctx->gb);
321 int32_t d = bytestream2_get_be32(&ctx->gb);
322 int16_t *dest = (int16_t *)frame->data[plane] + ctx->band[plane][i + 1].x +
323 stride * ctx->band[plane][i + 1].y;
324 unsigned size = ctx->band[plane][i + 1].size;
327 magic = bytestream2_get_be32(&ctx->gb);
328 if (magic != 0xDEADBEEF) {
329 av_log(avctx, AV_LOG_ERROR, "wrong magic number: 0x%08"PRIX32
330 " for plane %d, band %d\n", magic, plane, i);
331 return AVERROR_INVALIDDATA;
334 ret = read_high_coeffs(avctx, ptr + bytestream2_tell(&ctx->gb), dest, size,
335 c, (b >= FFABS(a)) ? b : a, d,
336 ctx->band[plane][i + 1].width, stride);
338 av_log(avctx, AV_LOG_ERROR, "error in highpass coefficients for plane %d, band %d\n", plane, i);
341 bytestream2_skip(&ctx->gb, ret);
347 static void lowpass_prediction(int16_t *dst, int16_t *pred, int width, int height, ptrdiff_t stride)
352 memset(pred, 0, width * sizeof(*pred));
354 for (i = 0; i < height; i++) {
355 val = pred[0] + dst[0];
356 dst[0] = pred[0] = val;
357 for (j = 1; j < width; j++) {
358 val = pred[j] + dst[j];
359 dst[j] = pred[j] = val;
366 static void filterfn(int16_t *dest, int16_t *tmp, unsigned size, int64_t scale)
368 int16_t *low, *high, *ll, *lh, *hl, *hh;
374 high = &low[hsize + 8];
376 memcpy(low, dest, size);
377 memcpy(high, dest + hsize, size);
383 for (i = 4, j = 2; i; i--, j++, ll--, hh++, lh++, hl--) {
384 low[i - 5] = low[j - 1];
386 high[i - 5] = high[j - 2];
390 for (i = 0; i < hsize; i++) {
391 value = (int64_t) low [i + 1] * -INT64_C(325392907) +
392 (int64_t) low [i + 0] * INT64_C(3687786320) +
393 (int64_t) low [i - 1] * -INT64_C(325392907) +
394 (int64_t) high[i + 0] * INT64_C(1518500249) +
395 (int64_t) high[i - 1] * INT64_C(1518500249);
396 dest[i * 2] = av_clip_int16(((value >> 32) * scale) >> 32);
399 for (i = 0; i < hsize; i++) {
400 value = (int64_t) low [i + 2] * -INT64_C(65078576) +
401 (int64_t) low [i + 1] * INT64_C(1583578880) +
402 (int64_t) low [i + 0] * INT64_C(1583578880) +
403 (int64_t) low [i - 1] * -INT64_C(65078576) +
404 (int64_t) high[i + 1] * INT64_C(303700064) +
405 (int64_t) high[i + 0] * -INT64_C(3644400640) +
406 (int64_t) high[i - 1] * INT64_C(303700064);
407 dest[i * 2 + 1] = av_clip_int16(((value >> 32) * scale) >> 32);
411 static void reconstruction(AVCodecContext *avctx,
412 int16_t *dest, unsigned width, unsigned height, ptrdiff_t stride, int nb_levels,
413 int64_t *scaling_H, int64_t *scaling_V)
415 PixletContext *ctx = avctx->priv_data;
416 unsigned scaled_width, scaled_height;
417 int64_t scale_H, scale_V;
421 scaled_height = height >> nb_levels;
422 scaled_width = width >> nb_levels;
423 tmp = ctx->filter[0];
425 for (i = 0; i < nb_levels; i++) {
428 scale_H = scaling_H[i];
429 scale_V = scaling_V[i];
432 for (j = 0; j < scaled_height; j++) {
433 filterfn(ptr, ctx->filter[1], scaled_width, scale_V);
437 for (j = 0; j < scaled_width; j++) {
439 for (k = 0; k < scaled_height; k++) {
444 filterfn(tmp, ctx->filter[1], scaled_height, scale_H);
447 for (k = 0; k < scaled_height; k++) {
455 static void postprocess_luma(AVFrame *frame, int w, int h, int depth)
457 uint16_t *dsty = (uint16_t *)frame->data[0];
458 int16_t *srcy = (int16_t *)frame->data[0];
459 ptrdiff_t stridey = frame->linesize[0] / 2;
462 for (j = 0; j < h; j++) {
463 for (i = 0; i < w; i++) {
466 else if (srcy[i] > ((1 << depth) - 1))
469 dsty[i] = ((int64_t) srcy[i] * srcy[i] * 65535) /
470 ((1 << depth) - 1) / ((1 << depth) - 1);
477 static void postprocess_chroma(AVFrame *frame, int w, int h, int depth)
479 uint16_t *dstu = (uint16_t *)frame->data[1];
480 uint16_t *dstv = (uint16_t *)frame->data[2];
481 int16_t *srcu = (int16_t *)frame->data[1];
482 int16_t *srcv = (int16_t *)frame->data[2];
483 ptrdiff_t strideu = frame->linesize[1] / 2;
484 ptrdiff_t stridev = frame->linesize[2] / 2;
485 const unsigned add = 1 << (depth - 1);
486 const unsigned shift = 16 - depth;
489 for (j = 0; j < h; j++) {
490 for (i = 0; i < w; i++) {
491 dstu[i] = av_clip_uintp2_c(add + srcu[i], depth) << shift;
492 dstv[i] = av_clip_uintp2_c(add + srcv[i], depth) << shift;
501 static int decode_plane(AVCodecContext *avctx, int plane, AVPacket *avpkt, AVFrame *frame)
503 PixletContext *ctx = avctx->priv_data;
504 ptrdiff_t stride = frame->linesize[plane] / 2;
505 unsigned shift = plane > 0;
509 for (i = ctx->levels - 1; i >= 0; i--) {
510 int32_t h = sign_extend(bytestream2_get_be32(&ctx->gb), 32);
511 int32_t v = sign_extend(bytestream2_get_be32(&ctx->gb), 32);
514 return AVERROR_INVALIDDATA;
516 ctx->scaling[plane][H][i] = (1000000ULL << 32) / h;
517 ctx->scaling[plane][V][i] = (1000000ULL << 32) / v;
520 bytestream2_skip(&ctx->gb, 4);
522 dst = (int16_t *)frame->data[plane];
523 dst[0] = sign_extend(bytestream2_get_be16(&ctx->gb), 16);
525 if ((ret = init_get_bits8(&ctx->gbit, avpkt->data + bytestream2_tell(&ctx->gb),
526 bytestream2_get_bytes_left(&ctx->gb))) < 0)
529 ret = read_low_coeffs(avctx, dst + 1, ctx->band[plane][0].width - 1, ctx->band[plane][0].width - 1, 0);
531 av_log(avctx, AV_LOG_ERROR, "error in lowpass coefficients for plane %d, top row\n", plane);
535 ret = read_low_coeffs(avctx, dst + stride, ctx->band[plane][0].height - 1, 1, stride);
537 av_log(avctx, AV_LOG_ERROR, "error in lowpass coefficients for plane %d, left column\n", plane);
541 ret = read_low_coeffs(avctx, dst + stride + 1,
542 (ctx->band[plane][0].width - 1) * (ctx->band[plane][0].height - 1),
543 ctx->band[plane][0].width - 1, stride);
545 av_log(avctx, AV_LOG_ERROR, "error in lowpass coefficients for plane %d, rest\n", plane);
549 bytestream2_skip(&ctx->gb, ret);
550 if (bytestream2_get_bytes_left(&ctx->gb) <= 0) {
551 av_log(avctx, AV_LOG_ERROR, "no bytes left\n");
552 return AVERROR_INVALIDDATA;
555 ret = read_highpass(avctx, avpkt->data, plane, frame);
559 lowpass_prediction(dst, ctx->prediction,
560 ctx->band[plane][0].width, ctx->band[plane][0].height, stride);
562 reconstruction(avctx, (int16_t *)frame->data[plane], ctx->w >> shift, ctx->h >> shift,
563 stride, NB_LEVELS, ctx->scaling[plane][H], ctx->scaling[plane][V]);
568 static int pixlet_decode_frame(AVCodecContext *avctx, void *data,
569 int *got_frame, AVPacket *avpkt)
571 PixletContext *ctx = avctx->priv_data;
572 int i, w, h, width, height, ret, version;
574 ThreadFrame frame = { .f = data };
577 bytestream2_init(&ctx->gb, avpkt->data, avpkt->size);
579 pktsize = bytestream2_get_be32(&ctx->gb);
580 if (pktsize <= 44 || pktsize - 4 > bytestream2_get_bytes_left(&ctx->gb)) {
581 av_log(avctx, AV_LOG_ERROR, "Invalid packet size %"PRIu32"\n", pktsize);
582 return AVERROR_INVALIDDATA;
585 version = bytestream2_get_le32(&ctx->gb);
587 avpriv_request_sample(avctx, "Version %d", version);
589 bytestream2_skip(&ctx->gb, 4);
590 if (bytestream2_get_be32(&ctx->gb) != 1)
591 return AVERROR_INVALIDDATA;
592 bytestream2_skip(&ctx->gb, 4);
594 width = bytestream2_get_be32(&ctx->gb);
595 height = bytestream2_get_be32(&ctx->gb);
597 w = FFALIGN(width, 1 << (NB_LEVELS + 1));
598 h = FFALIGN(height, 1 << (NB_LEVELS + 1));
600 ctx->levels = bytestream2_get_be32(&ctx->gb);
601 if (ctx->levels != NB_LEVELS)
602 return AVERROR_INVALIDDATA;
603 ctx->depth = bytestream2_get_be32(&ctx->gb);
604 if (ctx->depth < 8 || ctx->depth > 15) {
605 avpriv_request_sample(avctx, "Depth %d", ctx->depth);
606 return AVERROR_INVALIDDATA;
609 ret = ff_set_dimensions(avctx, w, h);
612 avctx->width = width;
613 avctx->height = height;
615 if (ctx->w != w || ctx->h != h) {
620 ret = init_decoder(avctx);
629 bytestream2_skip(&ctx->gb, 8);
631 p->pict_type = AV_PICTURE_TYPE_I;
633 p->color_range = AVCOL_RANGE_JPEG;
635 ret = ff_thread_get_buffer(avctx, &frame, 0);
639 for (i = 0; i < 3; i++) {
640 ret = decode_plane(avctx, i, avpkt, frame.f);
643 if (avctx->flags & AV_CODEC_FLAG_GRAY)
647 postprocess_luma(frame.f, ctx->w, ctx->h, ctx->depth);
648 postprocess_chroma(frame.f, ctx->w >> 1, ctx->h >> 1, ctx->depth);
656 static int pixlet_init_thread_copy(AVCodecContext *avctx)
658 PixletContext *ctx = avctx->priv_data;
660 ctx->filter[0] = NULL;
661 ctx->filter[1] = NULL;
662 ctx->prediction = NULL;
669 AVCodec ff_pixlet_decoder = {
671 .long_name = NULL_IF_CONFIG_SMALL("Apple Pixlet"),
672 .type = AVMEDIA_TYPE_VIDEO,
673 .id = AV_CODEC_ID_PIXLET,
675 .init_thread_copy = ONLY_IF_THREADS_ENABLED(pixlet_init_thread_copy),
676 .close = pixlet_close,
677 .decode = pixlet_decode_frame,
678 .priv_data_size = sizeof(PixletContext),
679 .capabilities = AV_CODEC_CAP_DR1 |
680 AV_CODEC_CAP_FRAME_THREADS,
681 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
682 FF_CODEC_CAP_INIT_CLEANUP,