4 * Copyright (c) 2014 Konstantin Shishkov
5 * Copyright (c) 2014 Derek Buitenhuis
7 * This file is part of FFmpeg.
9 * FFmpeg is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
14 * FFmpeg is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with FFmpeg; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 #include "libavutil/common.h"
25 #include "libavutil/opt.h"
31 typedef struct FICThreadContext {
32 DECLARE_ALIGNED(16, int16_t, block)[64];
40 typedef struct FICContext {
42 AVCodecContext *avctx;
46 FICThreadContext *slice_data;
51 enum AVPictureType cur_frame_type;
53 int aligned_width, aligned_height;
54 int num_slices, slice_h;
56 uint8_t cursor_buf[4096];
60 static const uint8_t fic_qmat_hq[64] = {
61 1, 2, 2, 2, 3, 3, 3, 4,
62 2, 2, 2, 3, 3, 3, 4, 4,
63 2, 2, 3, 3, 3, 4, 4, 4,
64 2, 2, 3, 3, 3, 4, 4, 5,
65 2, 3, 3, 3, 4, 4, 5, 6,
66 3, 3, 3, 4, 4, 5, 6, 7,
67 3, 3, 3, 4, 4, 5, 7, 7,
68 3, 3, 4, 4, 5, 7, 7, 7,
71 static const uint8_t fic_qmat_lq[64] = {
72 1, 5, 6, 7, 8, 9, 9, 11,
73 5, 5, 7, 8, 9, 9, 11, 12,
74 6, 7, 8, 9, 9, 11, 11, 12,
75 7, 7, 8, 9, 9, 11, 12, 13,
76 7, 8, 9, 9, 10, 11, 13, 16,
77 8, 9, 9, 10, 11, 13, 16, 19,
78 8, 9, 9, 11, 12, 15, 18, 23,
79 9, 9, 11, 12, 15, 18, 23, 27
82 static const uint8_t fic_header[7] = { 0, 0, 1, 'F', 'I', 'C', 'V' };
84 #define FIC_HEADER_SIZE 27
86 static av_always_inline void fic_idct(int16_t *blk, int step, int shift, int rnd)
88 const unsigned t0 = 27246 * blk[3 * step] + 18405 * blk[5 * step];
89 const unsigned t1 = 27246 * blk[5 * step] - 18405 * blk[3 * step];
90 const unsigned t2 = 6393 * blk[7 * step] + 32139 * blk[1 * step];
91 const unsigned t3 = 6393 * blk[1 * step] - 32139 * blk[7 * step];
92 const unsigned t4 = 5793U * ((int)(t2 + t0 + 0x800) >> 12);
93 const unsigned t5 = 5793U * ((int)(t3 + t1 + 0x800) >> 12);
94 const unsigned t6 = t2 - t0;
95 const unsigned t7 = t3 - t1;
96 const unsigned t8 = 17734 * blk[2 * step] - 42813 * blk[6 * step];
97 const unsigned t9 = 17734 * blk[6 * step] + 42814 * blk[2 * step];
98 const unsigned tA = (blk[0 * step] - blk[4 * step]) * 32768 + rnd;
99 const unsigned tB = (blk[0 * step] + blk[4 * step]) * 32768 + rnd;
100 blk[0 * step] = (int)( t4 + t9 + tB) >> shift;
101 blk[1 * step] = (int)( t6 + t7 + t8 + tA) >> shift;
102 blk[2 * step] = (int)( t6 - t7 - t8 + tA) >> shift;
103 blk[3 * step] = (int)( t5 - t9 + tB) >> shift;
104 blk[4 * step] = (int)( -t5 - t9 + tB) >> shift;
105 blk[5 * step] = (int)(-(t6 - t7) - t8 + tA) >> shift;
106 blk[6 * step] = (int)(-(t6 + t7) + t8 + tA) >> shift;
107 blk[7 * step] = (int)( -t4 + t9 + tB) >> shift;
110 static void fic_idct_put(uint8_t *dst, int stride, int16_t *block)
116 fic_idct(ptr++, 8, 13, (1 << 12) + (1 << 17));
117 for (i = 1; i < 8; i++) {
118 fic_idct(ptr, 8, 13, 1 << 12);
123 for (i = 0; i < 8; i++) {
124 fic_idct(ptr, 1, 20, 0);
129 for (j = 0; j < 8; j++) {
130 for (i = 0; i < 8; i++)
131 dst[i] = av_clip_uint8(ptr[i]);
136 static int fic_decode_block(FICContext *ctx, GetBitContext *gb,
137 uint8_t *dst, int stride, int16_t *block, int *is_p)
141 /* Is it a skip block? */
147 memset(block, 0, sizeof(*block) * 64);
149 num_coeff = get_bits(gb, 7);
151 return AVERROR_INVALIDDATA;
153 for (i = 0; i < num_coeff; i++) {
154 int v = get_se_golomb(gb);
155 if (v < -2048 || v > 2048)
156 return AVERROR_INVALIDDATA;
157 block[ff_zigzag_direct[i]] = v *
158 ctx->qmat[ff_zigzag_direct[i]];
161 fic_idct_put(dst, stride, block);
166 static int fic_decode_slice(AVCodecContext *avctx, void *tdata)
168 FICContext *ctx = avctx->priv_data;
169 FICThreadContext *tctx = tdata;
171 uint8_t *src = tctx->src;
172 int slice_h = tctx->slice_h;
173 int src_size = tctx->src_size;
174 int y_off = tctx->y_off;
177 init_get_bits(&gb, src, src_size * 8);
179 for (p = 0; p < 3; p++) {
180 int stride = ctx->frame->linesize[p];
181 uint8_t* dst = ctx->frame->data[p] + (y_off >> !!p) * stride;
183 for (y = 0; y < (slice_h >> !!p); y += 8) {
184 for (x = 0; x < (ctx->aligned_width >> !!p); x += 8) {
187 if ((ret = fic_decode_block(ctx, &gb, dst + x, stride,
188 tctx->block, &tctx->p_frame)) != 0)
199 static av_always_inline void fic_alpha_blend(uint8_t *dst, uint8_t *src,
200 int size, uint8_t *alpha)
204 for (i = 0; i < size; i++)
205 dst[i] += ((src[i] - dst[i]) * alpha[i]) >> 8;
208 static void fic_draw_cursor(AVCodecContext *avctx, int cur_x, int cur_y)
210 FICContext *ctx = avctx->priv_data;
211 uint8_t *ptr = ctx->cursor_buf;
213 uint8_t planes[4][1024];
214 uint8_t chroma[3][256];
217 /* Convert to YUVA444. */
218 for (i = 0; i < 1024; i++) {
219 planes[0][i] = (( 25 * ptr[0] + 129 * ptr[1] + 66 * ptr[2]) / 255) + 16;
220 planes[1][i] = ((-38 * ptr[0] + 112 * ptr[1] + -74 * ptr[2]) / 255) + 128;
221 planes[2][i] = ((-18 * ptr[0] + 112 * ptr[1] + -94 * ptr[2]) / 255) + 128;
222 planes[3][i] = ptr[3];
227 /* Subsample chroma. */
228 for (i = 0; i < 32; i += 2)
229 for (j = 0; j < 32; j += 2)
230 for (p = 0; p < 3; p++)
231 chroma[p][16 * (i / 2) + j / 2] = (planes[p + 1][32 * i + j ] +
232 planes[p + 1][32 * i + j + 1] +
233 planes[p + 1][32 * (i + 1) + j ] +
234 planes[p + 1][32 * (i + 1) + j + 1]) / 4;
236 /* Seek to x/y pos of cursor. */
237 for (i = 0; i < 3; i++)
238 dstptr[i] = ctx->final_frame->data[i] +
239 (ctx->final_frame->linesize[i] * (cur_y >> !!i)) +
240 (cur_x >> !!i) + !!i;
243 for (i = 0; i < FFMIN(32, avctx->height - cur_y) - 1; i += 2) {
244 int lsize = FFMIN(32, avctx->width - cur_x);
245 int csize = lsize / 2;
247 fic_alpha_blend(dstptr[0],
248 planes[0] + i * 32, lsize, planes[3] + i * 32);
249 fic_alpha_blend(dstptr[0] + ctx->final_frame->linesize[0],
250 planes[0] + (i + 1) * 32, lsize, planes[3] + (i + 1) * 32);
251 fic_alpha_blend(dstptr[1],
252 chroma[0] + (i / 2) * 16, csize, chroma[2] + (i / 2) * 16);
253 fic_alpha_blend(dstptr[2],
254 chroma[1] + (i / 2) * 16, csize, chroma[2] + (i / 2) * 16);
256 dstptr[0] += ctx->final_frame->linesize[0] * 2;
257 dstptr[1] += ctx->final_frame->linesize[1];
258 dstptr[2] += ctx->final_frame->linesize[2];
262 static int fic_decode_frame(AVCodecContext *avctx, void *data,
263 int *got_frame, AVPacket *avpkt)
265 FICContext *ctx = avctx->priv_data;
266 uint8_t *src = avpkt->data;
272 int skip_cursor = ctx->skip_cursor;
275 if ((ret = ff_reget_buffer(avctx, ctx->frame)) < 0)
278 /* Header + at least one slice (4) */
279 if (avpkt->size < FIC_HEADER_SIZE + 4) {
280 av_log(avctx, AV_LOG_ERROR, "Frame data is too small.\n");
281 return AVERROR_INVALIDDATA;
284 /* Check for header. */
285 if (memcmp(src, fic_header, 7))
286 av_log(avctx, AV_LOG_WARNING, "Invalid FIC Header.\n");
288 /* Is it a skip frame? */
290 if (!ctx->final_frame) {
291 av_log(avctx, AV_LOG_WARNING, "Initial frame is skipped\n");
292 return AVERROR_INVALIDDATA;
299 av_log(avctx, AV_LOG_ERROR, "Zero slices found.\n");
300 return AVERROR_INVALIDDATA;
303 /* High or Low Quality Matrix? */
304 ctx->qmat = src[23] ? fic_qmat_hq : fic_qmat_lq;
306 /* Skip cursor data. */
307 tsize = AV_RB24(src + 24);
308 if (tsize > avpkt->size - FIC_HEADER_SIZE) {
309 av_log(avctx, AV_LOG_ERROR,
310 "Packet is too small to contain cursor (%d vs %d bytes).\n",
311 tsize, avpkt->size - FIC_HEADER_SIZE);
312 return AVERROR_INVALIDDATA;
315 if (!tsize || !AV_RL16(src + 37) || !AV_RL16(src + 39))
318 if (!skip_cursor && tsize < 32) {
319 av_log(avctx, AV_LOG_WARNING,
320 "Cursor data too small. Skipping cursor.\n");
324 /* Cursor position. */
325 cur_x = AV_RL16(src + 33);
326 cur_y = AV_RL16(src + 35);
327 if (!skip_cursor && (cur_x > avctx->width || cur_y > avctx->height)) {
328 av_log(avctx, AV_LOG_DEBUG,
329 "Invalid cursor position: (%d,%d). Skipping cursor.\n",
334 if (!skip_cursor && (AV_RL16(src + 37) != 32 || AV_RL16(src + 39) != 32)) {
335 av_log(avctx, AV_LOG_WARNING,
336 "Invalid cursor size. Skipping cursor.\n");
340 /* Slice height for all but the last slice. */
341 ctx->slice_h = 16 * (ctx->aligned_height >> 4) / nslices;
342 if (ctx->slice_h % 16)
343 ctx->slice_h = FFALIGN(ctx->slice_h - 16, 16);
345 /* First slice offset and remaining data. */
346 sdata = src + tsize + FIC_HEADER_SIZE + 4 * nslices;
347 msize = avpkt->size - nslices * 4 - tsize - FIC_HEADER_SIZE;
350 av_log(avctx, AV_LOG_ERROR, "Not enough frame data to decode.\n");
351 return AVERROR_INVALIDDATA;
354 /* Allocate slice data. */
355 av_fast_malloc(&ctx->slice_data, &ctx->slice_data_size,
356 nslices * sizeof(ctx->slice_data[0]));
357 if (!ctx->slice_data_size) {
358 av_log(avctx, AV_LOG_ERROR, "Could not allocate slice data.\n");
359 return AVERROR(ENOMEM);
361 memset(ctx->slice_data, 0, nslices * sizeof(ctx->slice_data[0]));
363 for (slice = 0; slice < nslices; slice++) {
364 unsigned slice_off = AV_RB32(src + tsize + FIC_HEADER_SIZE + slice * 4);
366 int y_off = ctx->slice_h * slice;
367 int slice_h = ctx->slice_h;
370 * Either read the slice size, or consume all data left.
371 * Also, special case the last slight height.
373 if (slice == nslices - 1) {
375 slice_h = FFALIGN(avctx->height - ctx->slice_h * (nslices - 1), 16);
377 slice_size = AV_RB32(src + tsize + FIC_HEADER_SIZE + slice * 4 + 4);
380 if (slice_size < slice_off || slice_size > msize)
383 slice_size -= slice_off;
385 ctx->slice_data[slice].src = sdata + slice_off;
386 ctx->slice_data[slice].src_size = slice_size;
387 ctx->slice_data[slice].slice_h = slice_h;
388 ctx->slice_data[slice].y_off = y_off;
391 if ((ret = avctx->execute(avctx, fic_decode_slice, ctx->slice_data,
392 NULL, nslices, sizeof(ctx->slice_data[0]))) < 0)
395 ctx->frame->key_frame = 1;
396 ctx->frame->pict_type = AV_PICTURE_TYPE_I;
397 for (slice = 0; slice < nslices; slice++) {
398 if (ctx->slice_data[slice].p_frame) {
399 ctx->frame->key_frame = 0;
400 ctx->frame->pict_type = AV_PICTURE_TYPE_P;
404 av_frame_free(&ctx->final_frame);
405 ctx->final_frame = av_frame_clone(ctx->frame);
406 if (!ctx->final_frame) {
407 av_log(avctx, AV_LOG_ERROR, "Could not clone frame buffer.\n");
408 return AVERROR(ENOMEM);
411 /* Make sure we use a user-supplied buffer. */
412 if ((ret = ff_reget_buffer(avctx, ctx->final_frame)) < 0) {
413 av_log(avctx, AV_LOG_ERROR, "Could not make frame writable.\n");
419 memcpy(ctx->cursor_buf, src + 59, 32 * 32 * 4);
420 fic_draw_cursor(avctx, cur_x, cur_y);
425 if ((ret = av_frame_ref(data, ctx->final_frame)) < 0)
431 static av_cold int fic_decode_close(AVCodecContext *avctx)
433 FICContext *ctx = avctx->priv_data;
435 av_freep(&ctx->slice_data);
436 av_frame_free(&ctx->final_frame);
437 av_frame_free(&ctx->frame);
442 static av_cold int fic_decode_init(AVCodecContext *avctx)
444 FICContext *ctx = avctx->priv_data;
446 /* Initialize various context values */
448 ctx->aligned_width = FFALIGN(avctx->width, 16);
449 ctx->aligned_height = FFALIGN(avctx->height, 16);
451 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
452 avctx->bits_per_raw_sample = 8;
454 ctx->frame = av_frame_alloc();
456 return AVERROR(ENOMEM);
461 static const AVOption options[] = {
462 { "skip_cursor", "skip the cursor", offsetof(FICContext, skip_cursor), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM },
466 static const AVClass fic_decoder_class = {
467 .class_name = "FIC encoder",
468 .item_name = av_default_item_name,
470 .version = LIBAVUTIL_VERSION_INT,
473 AVCodec ff_fic_decoder = {
475 .long_name = NULL_IF_CONFIG_SMALL("Mirillis FIC"),
476 .type = AVMEDIA_TYPE_VIDEO,
477 .id = AV_CODEC_ID_FIC,
478 .priv_data_size = sizeof(FICContext),
479 .init = fic_decode_init,
480 .decode = fic_decode_frame,
481 .close = fic_decode_close,
482 .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_SLICE_THREADS,
483 .priv_class = &fic_decoder_class,