2 * Apple Intermediate Codec decoder
4 * Copyright (c) 2013 Konstantin Shishkov
6 * This file is part of Libav.
8 * Libav is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * Libav is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with Libav; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 #include "bytestream.h"
31 #define AIC_HDR_SIZE 24
32 #define AIC_BAND_COEFFS (64 + 32 + 192 + 96)
42 static const int aic_num_band_coeffs[NUM_BANDS] = { 64, 32, 192, 96 };
44 static const int aic_band_off[NUM_BANDS] = { 0, 64, 96, 288 };
46 static const uint8_t aic_quant_matrix[64] = {
47 8, 16, 19, 22, 22, 26, 26, 27,
48 16, 16, 22, 22, 26, 27, 27, 29,
49 19, 22, 26, 26, 27, 29, 29, 35,
50 22, 24, 27, 27, 29, 32, 34, 38,
51 26, 27, 29, 29, 32, 35, 38, 46,
52 27, 29, 34, 34, 35, 40, 46, 56,
53 29, 34, 34, 37, 40, 48, 56, 69,
54 34, 37, 38, 40, 48, 58, 69, 83,
57 static const uint8_t aic_y_scan[64] = {
58 0, 4, 1, 2, 5, 8, 12, 9,
59 6, 3, 7, 10, 13, 14, 11, 15,
60 47, 43, 46, 45, 42, 39, 35, 38,
61 41, 44, 40, 37, 34, 33, 36, 32,
62 16, 20, 17, 18, 21, 24, 28, 25,
63 22, 19, 23, 26, 29, 30, 27, 31,
64 63, 59, 62, 61, 58, 55, 51, 54,
65 57, 60, 56, 53, 50, 49, 52, 48,
68 static const uint8_t aic_y_ext_scan[192] = {
69 64, 72, 65, 66, 73, 80, 88, 81,
70 74, 67, 75, 82, 89, 90, 83, 91,
71 0, 4, 1, 2, 5, 8, 12, 9,
72 6, 3, 7, 10, 13, 14, 11, 15,
73 16, 20, 17, 18, 21, 24, 28, 25,
74 22, 19, 23, 26, 29, 30, 27, 31,
75 155, 147, 154, 153, 146, 139, 131, 138,
76 145, 152, 144, 137, 130, 129, 136, 128,
77 47, 43, 46, 45, 42, 39, 35, 38,
78 41, 44, 40, 37, 34, 33, 36, 32,
79 63, 59, 62, 61, 58, 55, 51, 54,
80 57, 60, 56, 53, 50, 49, 52, 48,
81 96, 104, 97, 98, 105, 112, 120, 113,
82 106, 99, 107, 114, 121, 122, 115, 123,
83 68, 76, 69, 70, 77, 84, 92, 85,
84 78, 71, 79, 86, 93, 94, 87, 95,
85 100, 108, 101, 102, 109, 116, 124, 117,
86 110, 103, 111, 118, 125, 126, 119, 127,
87 187, 179, 186, 185, 178, 171, 163, 170,
88 177, 184, 176, 169, 162, 161, 168, 160,
89 159, 151, 158, 157, 150, 143, 135, 142,
90 149, 156, 148, 141, 134, 133, 140, 132,
91 191, 183, 190, 189, 182, 175, 167, 174,
92 181, 188, 180, 173, 166, 165, 172, 164,
95 static const uint8_t aic_c_scan[64] = {
96 0, 4, 1, 2, 5, 8, 12, 9,
97 6, 3, 7, 10, 13, 14, 11, 15,
98 31, 27, 30, 29, 26, 23, 19, 22,
99 25, 28, 24, 21, 18, 17, 20, 16,
100 32, 36, 33, 34, 37, 40, 44, 41,
101 38, 35, 39, 42, 45, 46, 43, 47,
102 63, 59, 62, 61, 58, 55, 51, 54,
103 57, 60, 56, 53, 50, 49, 52, 48,
106 static const uint8_t aic_c_ext_scan[192] = {
107 16, 24, 17, 18, 25, 32, 40, 33,
108 26, 19, 27, 34, 41, 42, 35, 43,
109 0, 4, 1, 2, 5, 8, 12, 9,
110 6, 3, 7, 10, 13, 14, 11, 15,
111 20, 28, 21, 22, 29, 36, 44, 37,
112 30, 23, 31, 38, 45, 46, 39, 47,
113 95, 87, 94, 93, 86, 79, 71, 78,
114 85, 92, 84, 77, 70, 69, 76, 68,
115 63, 59, 62, 61, 58, 55, 51, 54,
116 57, 60, 56, 53, 50, 49, 52, 48,
117 91, 83, 90, 89, 82, 75, 67, 74,
118 81, 88, 80, 73, 66, 65, 72, 64,
119 112, 120, 113, 114, 121, 128, 136, 129,
120 122, 115, 123, 130, 137, 138, 131, 139,
121 96, 100, 97, 98, 101, 104, 108, 105,
122 102, 99, 103, 106, 109, 110, 107, 111,
123 116, 124, 117, 118, 125, 132, 140, 133,
124 126, 119, 127, 134, 141, 142, 135, 143,
125 191, 183, 190, 189, 182, 175, 167, 174,
126 181, 188, 180, 173, 166, 165, 172, 164,
127 159, 155, 158, 157, 154, 151, 147, 150,
128 153, 156, 152, 149, 146, 145, 148, 144,
129 187, 179, 186, 185, 178, 171, 163, 170,
130 177, 184, 176, 169, 162, 161, 168, 160,
133 static const uint8_t *aic_scan[NUM_BANDS] = {
134 aic_y_scan, aic_c_scan, aic_y_ext_scan, aic_c_ext_scan
137 typedef struct AICContext {
138 AVCodecContext *avctx;
145 int mb_width, mb_height;
150 int16_t *data_ptr[NUM_BANDS];
152 DECLARE_ALIGNED(16, int16_t, block)[64];
155 static int aic_decode_header(AICContext *ctx, const uint8_t *src, int size)
161 av_log(ctx->avctx, AV_LOG_ERROR, "Invalid version %d\n", src[0]);
162 return AVERROR_INVALIDDATA;
164 if (src[1] != AIC_HDR_SIZE - 2) {
165 av_log(ctx->avctx, AV_LOG_ERROR, "Invalid header size %d\n", src[1]);
166 return AVERROR_INVALIDDATA;
168 frame_size = AV_RB32(src + 2);
169 width = AV_RB16(src + 6);
170 height = AV_RB16(src + 8);
171 if (frame_size > size) {
172 av_log(ctx->avctx, AV_LOG_ERROR, "Frame size should be %d got %d\n",
174 return AVERROR_INVALIDDATA;
176 if (width != ctx->avctx->width || height != ctx->avctx->height) {
177 av_log(ctx->avctx, AV_LOG_ERROR,
178 "Picture dimension changed: old: %d x %d, new: %d x %d\n",
179 ctx->avctx->width, ctx->avctx->height, width, height);
180 return AVERROR_INVALIDDATA;
182 ctx->quant = src[15];
183 ctx->interlaced = ((src[16] >> 4) == 3);
188 #define GET_CODE(val, type, add_bits) \
191 val = get_ue_golomb(gb); \
193 val = get_unary(gb, 1, 31); \
195 val = (val << add_bits) + get_bits(gb, add_bits); \
198 static int aic_decode_coeffs(GetBitContext *gb, int16_t *dst,
199 int band, int slice_width)
201 int has_skips, coeff_type, coeff_bits, skip_type, skip_bits;
202 const int num_coeffs = aic_num_band_coeffs[band];
203 const uint8_t *scan = aic_scan[band];
206 has_skips = get_bits1(gb);
207 coeff_type = get_bits1(gb);
208 coeff_bits = get_bits(gb, 3);
211 skip_type = get_bits1(gb);
212 skip_bits = get_bits(gb, 3);
214 for (mb = 0; mb < slice_width; mb++) {
217 GET_CODE(val, skip_type, skip_bits);
219 if (idx >= num_coeffs)
221 GET_CODE(val, coeff_type, coeff_bits);
224 return AVERROR_INVALIDDATA;
225 dst[scan[idx]] = val;
226 } while (idx < num_coeffs - 1);
230 for (mb = 0; mb < slice_width; mb++) {
231 for (idx = 0; idx < num_coeffs; idx++) {
232 GET_CODE(val, coeff_type, coeff_bits);
234 return AVERROR_INVALIDDATA;
235 dst[scan[idx]] = val;
243 static void recombine_block(int16_t *dst, const uint8_t *scan,
244 int16_t **base, int16_t **ext)
248 for (i = 0; i < 4; i++) {
249 for (j = 0; j < 4; j++)
250 dst[scan[i * 8 + j]] = (*base)[j];
251 for (j = 0; j < 4; j++)
252 dst[scan[i * 8 + j + 4]] = (*ext)[j];
257 for (j = 0; j < 8; j++)
258 dst[scan[i * 8 + j]] = (*ext)[j];
263 static void recombine_block_il(int16_t *dst, const uint8_t *scan,
264 int16_t **base, int16_t **ext,
270 for (i = 0; i < 8; i++) {
271 for (j = 0; j < 4; j++)
272 dst[scan[i * 8 + j]] = (*base)[j];
273 for (j = 0; j < 4; j++)
274 dst[scan[i * 8 + j + 4]] = (*ext)[j];
279 for (i = 0; i < 64; i++)
280 dst[scan[i]] = (*ext)[i];
285 static void unquant_block(int16_t *block, int q)
289 for (i = 0; i < 64; i++) {
290 int val = (uint16_t)block[i];
293 block[i] = (((val >> 1) ^ -sign) * q * aic_quant_matrix[i] >> 4)
298 static int aic_decode_slice(AICContext *ctx, int mb_x, int mb_y,
299 const uint8_t *src, int src_size)
303 int slice_width = FFMIN(ctx->slice_width, ctx->mb_width - mb_x);
306 int16_t *base_y = ctx->data_ptr[COEFF_LUMA];
307 int16_t *base_c = ctx->data_ptr[COEFF_CHROMA];
308 int16_t *ext_y = ctx->data_ptr[COEFF_LUMA_EXT];
309 int16_t *ext_c = ctx->data_ptr[COEFF_CHROMA_EXT];
310 const int ystride = ctx->frame->linesize[0];
312 Y = ctx->frame->data[0] + mb_x * 16 + mb_y * 16 * ystride;
313 for (i = 0; i < 2; i++)
314 C[i] = ctx->frame->data[i + 1] + mb_x * 8
315 + mb_y * 8 * ctx->frame->linesize[i + 1];
316 init_get_bits(&gb, src, src_size * 8);
318 memset(ctx->slice_data, 0,
319 sizeof(*ctx->slice_data) * slice_width * AIC_BAND_COEFFS);
320 for (i = 0; i < NUM_BANDS; i++)
321 if ((ret = aic_decode_coeffs(&gb, ctx->data_ptr[i],
322 i, slice_width)) < 0)
325 for (mb = 0; mb < slice_width; mb++) {
326 for (blk = 0; blk < 4; blk++) {
327 if (!ctx->interlaced)
328 recombine_block(ctx->block, ctx->scantable.permutated,
331 recombine_block_il(ctx->block, ctx->scantable.permutated,
332 &base_y, &ext_y, blk);
333 unquant_block(ctx->block, ctx->quant);
334 ctx->dsp.idct(ctx->block);
336 if (!ctx->interlaced) {
337 dst = Y + (blk & 1) * 8 * ystride + (blk >> 1) * 8;
338 ctx->dsp.put_signed_pixels_clamped(ctx->block, dst,
341 dst = Y + (blk & 1) * 8 + (blk >> 1) * ystride;
342 ctx->dsp.put_signed_pixels_clamped(ctx->block, dst,
348 for (blk = 0; blk < 2; blk++) {
349 recombine_block(ctx->block, ctx->scantable.permutated,
351 unquant_block(ctx->block, ctx->quant);
352 ctx->dsp.idct(ctx->block);
353 ctx->dsp.put_signed_pixels_clamped(ctx->block, C[blk],
354 ctx->frame->linesize[blk + 1]);
362 static int aic_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
365 AICContext *ctx = avctx->priv_data;
366 const uint8_t *buf = avpkt->data;
367 int buf_size = avpkt->size;
374 ctx->frame->pict_type = AV_PICTURE_TYPE_I;
375 ctx->frame->key_frame = 1;
377 off = FFALIGN(AIC_HDR_SIZE + ctx->num_x_slices * ctx->mb_height * 2, 4);
379 if (buf_size < off) {
380 av_log(avctx, AV_LOG_ERROR, "Too small frame\n");
381 return AVERROR_INVALIDDATA;
384 if ((ret = aic_decode_header(ctx, buf, buf_size)) < 0)
387 if ((ret = ff_get_buffer(avctx, ctx->frame, 0)) < 0)
390 bytestream2_init(&gb, buf + AIC_HDR_SIZE,
391 ctx->num_x_slices * ctx->mb_height * 2);
393 for (y = 0; y < ctx->mb_height; y++) {
394 for (x = 0; x < ctx->mb_width; x += ctx->slice_width) {
395 slice_size = bytestream2_get_le16(&gb) * 4;
396 if (slice_size + off > buf_size || !slice_size) {
397 av_log(avctx, AV_LOG_ERROR, "Incorrect slice size\n");
398 return AVERROR_INVALIDDATA;
401 if ((ret = aic_decode_slice(ctx, x, y,
402 buf + off, slice_size)) < 0)
414 static av_cold int aic_decode_init(AVCodecContext *avctx)
416 AICContext *ctx = avctx->priv_data;
422 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
424 ff_dsputil_init(&ctx->dsp, avctx);
426 for (i = 0; i < 64; i++)
428 ff_init_scantable(ctx->dsp.idct_permutation, &ctx->scantable, scan);
430 ctx->mb_width = FFALIGN(avctx->width, 16) >> 4;
431 ctx->mb_height = FFALIGN(avctx->height, 16) >> 4;
433 ctx->num_x_slices = 16;
434 ctx->slice_width = ctx->mb_width / 16;
435 for (i = 1; i < 32; i++) {
436 if (!(ctx->mb_width % i) && (ctx->mb_width / i < 32)) {
437 ctx->slice_width = ctx->mb_width / i;
438 ctx->num_x_slices = i;
443 ctx->slice_data = av_malloc(ctx->slice_width * AIC_BAND_COEFFS
444 * sizeof(*ctx->slice_data));
445 if (!ctx->slice_data) {
446 av_log(avctx, AV_LOG_ERROR, "Error allocating slice buffer\n");
448 return AVERROR(ENOMEM);
451 for (i = 0; i < NUM_BANDS; i++)
452 ctx->data_ptr[i] = ctx->slice_data + ctx->slice_width
458 static av_cold int aic_decode_close(AVCodecContext *avctx)
460 AICContext *ctx = avctx->priv_data;
462 av_freep(&ctx->slice_data);
467 AVCodec ff_aic_decoder = {
469 .type = AVMEDIA_TYPE_VIDEO,
470 .id = AV_CODEC_ID_AIC,
471 .priv_data_size = sizeof(AICContext),
472 .init = aic_decode_init,
473 .close = aic_decode_close,
474 .decode = aic_decode_frame,
475 .capabilities = CODEC_CAP_DR1,
476 .long_name = NULL_IF_CONFIG_SMALL("Apple Intermediate Codec")