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"
30 typedef struct FICThreadContext {
31 DECLARE_ALIGNED(16, int16_t, block)[64];
38 typedef struct FICContext {
39 AVCodecContext *avctx;
42 FICThreadContext *slice_data;
47 enum AVPictureType cur_frame_type;
49 int aligned_width, aligned_height;
50 int num_slices, slice_h;
53 static const uint8_t fic_qmat_hq[64] = {
54 1, 2, 2, 2, 3, 3, 3, 4,
55 2, 2, 2, 3, 3, 3, 4, 4,
56 2, 2, 3, 3, 3, 4, 4, 4,
57 2, 2, 3, 3, 3, 4, 4, 5,
58 2, 3, 3, 3, 4, 4, 5, 6,
59 3, 3, 3, 4, 4, 5, 6, 7,
60 3, 3, 3, 4, 4, 5, 7, 7,
61 3, 3, 4, 4, 5, 7, 7, 7,
64 static const uint8_t fic_qmat_lq[64] = {
65 1, 5, 6, 7, 8, 9, 9, 11,
66 5, 5, 7, 8, 9, 9, 11, 12,
67 6, 7, 8, 9, 9, 11, 11, 12,
68 7, 7, 8, 9, 9, 11, 12, 13,
69 7, 8, 9, 9, 10, 11, 13, 16,
70 8, 9, 9, 10, 11, 13, 16, 19,
71 8, 9, 9, 11, 12, 15, 18, 23,
72 9, 9, 11, 12, 15, 18, 23, 27
75 static const uint8_t fic_header[7] = { 0, 0, 1, 'F', 'I', 'C', 'V' };
77 #define FIC_HEADER_SIZE 27
79 static av_always_inline void fic_idct(int16_t *blk, int step, int shift)
81 const int t0 = 27246 * blk[3 * step] + 18405 * blk[5 * step];
82 const int t1 = 27246 * blk[5 * step] - 18405 * blk[3 * step];
83 const int t2 = 6393 * blk[7 * step] + 32139 * blk[1 * step];
84 const int t3 = 6393 * blk[1 * step] - 32139 * blk[7 * step];
85 const int t4 = 5793 * (t2 + t0 + 0x800 >> 12);
86 const int t5 = 5793 * (t3 + t1 + 0x800 >> 12);
87 const int t6 = t2 - t0;
88 const int t7 = t3 - t1;
89 const int t8 = 17734 * blk[2 * step] - 42813 * blk[6 * step];
90 const int t9 = 17734 * blk[6 * step] + 42814 * blk[2 * step];
91 const int tA = (blk[0 * step] - blk[4 * step] << 15) + (1 << shift - 1);
92 const int tB = (blk[0 * step] + blk[4 * step] << 15) + (1 << shift - 1);
93 blk[0 * step] = ( t4 + t9 + tB) >> shift;
94 blk[1 * step] = ( t6 + t7 + t8 + tA) >> shift;
95 blk[2 * step] = ( t6 - t7 - t8 + tA) >> shift;
96 blk[3 * step] = ( t5 - t9 + tB) >> shift;
97 blk[4 * step] = ( -t5 - t9 + tB) >> shift;
98 blk[5 * step] = (-(t6 - t7) - t8 + tA) >> shift;
99 blk[6 * step] = (-(t6 + t7) + t8 + tA) >> shift;
100 blk[7 * step] = ( -t4 + t9 + tB) >> shift;
103 static void fic_idct_put(uint8_t *dst, int stride, int16_t *block)
109 for (i = 0; i < 8; i++) {
110 fic_idct(ptr, 8, 13);
115 for (i = 0; i < 8; i++) {
116 fic_idct(ptr, 1, 20);
121 for (j = 0; j < 8; j++) {
122 for (i = 0; i < 8; i++)
123 dst[i] = av_clip_uint8(ptr[i]);
128 static int fic_decode_block(FICContext *ctx, GetBitContext *gb,
129 uint8_t *dst, int stride, int16_t *block)
133 /* Is it a skip block? */
135 /* This is a P-frame. */
136 ctx->frame->key_frame = 0;
137 ctx->frame->pict_type = AV_PICTURE_TYPE_P;
142 memset(block, 0, sizeof(*block) * 64);
144 num_coeff = get_bits(gb, 7);
146 return AVERROR_INVALIDDATA;
148 for (i = 0; i < num_coeff; i++)
149 block[ff_zigzag_direct[i]] = get_se_golomb(gb) *
150 ctx->qmat[ff_zigzag_direct[i]];
152 fic_idct_put(dst, stride, block);
157 static int fic_decode_slice(AVCodecContext *avctx, void *tdata)
159 FICContext *ctx = avctx->priv_data;
160 FICThreadContext *tctx = tdata;
162 uint8_t *src = tctx->src;
163 int slice_h = tctx->slice_h;
164 int src_size = tctx->src_size;
165 int y_off = tctx->y_off;
168 init_get_bits(&gb, src, src_size * 8);
170 for (p = 0; p < 3; p++) {
171 int stride = ctx->frame->linesize[p];
172 uint8_t* dst = ctx->frame->data[p] + (y_off >> !!p) * stride;
174 for (y = 0; y < (slice_h >> !!p); y += 8) {
175 for (x = 0; x < (ctx->aligned_width >> !!p); x += 8) {
178 if ((ret = fic_decode_block(ctx, &gb, dst + x, stride, tctx->block)) != 0)
189 static int fic_decode_frame(AVCodecContext *avctx, void *data,
190 int *got_frame, AVPacket *avpkt)
192 FICContext *ctx = avctx->priv_data;
193 uint8_t *src = avpkt->data;
200 if ((ret = ff_reget_buffer(avctx, ctx->frame)) < 0) {
201 av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
205 /* Header + at least one slice (4) */
206 if (avpkt->size < FIC_HEADER_SIZE + 4) {
207 av_log(avctx, AV_LOG_ERROR, "Frame data is too small.\n");
208 return AVERROR_INVALIDDATA;
211 /* Check for header. */
212 if (memcmp(src, fic_header, 7))
213 av_log(avctx, AV_LOG_WARNING, "Invalid FIC Header.\n");
215 /* Is it a skip frame? */
221 av_log(avctx, AV_LOG_ERROR, "Zero slices found.\n");
222 return AVERROR_INVALIDDATA;
225 /* High or Low Quality Matrix? */
226 ctx->qmat = src[23] ? fic_qmat_hq : fic_qmat_lq;
228 /* Skip cursor data. */
229 tsize = AV_RB24(src + 24);
230 if (tsize > avpkt->size - FIC_HEADER_SIZE) {
231 av_log(avctx, AV_LOG_ERROR, "Invalid cursor data size.\n");
232 return AVERROR_INVALIDDATA;
235 /* Slice height for all but the last slice. */
236 ctx->slice_h = 16 * (ctx->aligned_height >> 4) / nslices;
237 if (ctx->slice_h % 16)
238 ctx->slice_h = FFALIGN(ctx->slice_h - 16, 16);
240 /* First slice offset and remaining data. */
241 sdata = src + tsize + FIC_HEADER_SIZE + 4 * nslices;
242 msize = avpkt->size - nslices * 4 - tsize - FIC_HEADER_SIZE;
245 av_log(avctx, AV_LOG_ERROR, "Not enough frame data to decode.\n");
246 return AVERROR_INVALIDDATA;
250 * Set the frametype to I initially. It will be set to P if the frame
251 * has any dependencies (skip blocks). There will be a race condition
252 * inside the slice decode function to set these, but we do not care.
253 * since they will only ever be set to 0/P.
255 ctx->frame->key_frame = 1;
256 ctx->frame->pict_type = AV_PICTURE_TYPE_I;
258 /* Allocate slice data. */
259 av_fast_malloc(&ctx->slice_data, &ctx->slice_data_size,
260 nslices * sizeof(ctx->slice_data[0]));
261 if (!ctx->slice_data_size) {
262 av_log(avctx, AV_LOG_ERROR, "Could not allocate slice data.\n");
263 return AVERROR(ENOMEM);
265 memset(ctx->slice_data, 0, nslices * sizeof(ctx->slice_data[0]));
267 for (slice = 0; slice < nslices; slice++) {
268 unsigned slice_off = AV_RB32(src + tsize + FIC_HEADER_SIZE + slice * 4);
270 int y_off = ctx->slice_h * slice;
271 int slice_h = ctx->slice_h;
274 * Either read the slice size, or consume all data left.
275 * Also, special case the last slight height.
277 if (slice == nslices - 1) {
279 slice_h = FFALIGN(avctx->height - ctx->slice_h * (nslices - 1), 16);
281 slice_size = AV_RB32(src + tsize + FIC_HEADER_SIZE + slice * 4 + 4);
284 if (slice_size < slice_off || slice_size > msize)
287 slice_size -= slice_off;
289 ctx->slice_data[slice].src = sdata + slice_off;
290 ctx->slice_data[slice].src_size = slice_size;
291 ctx->slice_data[slice].slice_h = slice_h;
292 ctx->slice_data[slice].y_off = y_off;
295 if ((ret = avctx->execute(avctx, fic_decode_slice, ctx->slice_data,
296 NULL, nslices, sizeof(ctx->slice_data[0]))) < 0)
301 if ((ret = av_frame_ref(data, ctx->frame)) < 0)
307 static av_cold int fic_decode_close(AVCodecContext *avctx)
309 FICContext *ctx = avctx->priv_data;
311 av_freep(&ctx->slice_data);
312 av_frame_free(&ctx->frame);
317 static av_cold int fic_decode_init(AVCodecContext *avctx)
319 FICContext *ctx = avctx->priv_data;
321 /* Initialize various context values */
323 ctx->aligned_width = FFALIGN(avctx->width, 16);
324 ctx->aligned_height = FFALIGN(avctx->height, 16);
326 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
327 avctx->bits_per_raw_sample = 8;
329 ctx->frame = av_frame_alloc();
331 return AVERROR(ENOMEM);
336 AVCodec ff_fic_decoder = {
338 .long_name = NULL_IF_CONFIG_SMALL("Mirillis FIC"),
339 .type = AVMEDIA_TYPE_VIDEO,
340 .id = AV_CODEC_ID_FIC,
341 .priv_data_size = sizeof(FICContext),
342 .init = fic_decode_init,
343 .decode = fic_decode_frame,
344 .close = fic_decode_close,
345 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_SLICE_THREADS,