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, int force_chroma)
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 | force_chroma];
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],
323 !ctx->interlaced)) < 0)
326 for (mb = 0; mb < slice_width; mb++) {
327 for (blk = 0; blk < 4; blk++) {
328 if (!ctx->interlaced)
329 recombine_block(ctx->block, ctx->scantable.permutated,
332 recombine_block_il(ctx->block, ctx->scantable.permutated,
333 &base_y, &ext_y, blk);
334 unquant_block(ctx->block, ctx->quant);
335 ctx->dsp.idct(ctx->block);
337 if (!ctx->interlaced) {
338 dst = Y + (blk >> 1) * 8 * ystride + (blk & 1) * 8;
339 ctx->dsp.put_signed_pixels_clamped(ctx->block, dst,
342 dst = Y + (blk & 1) * 8 + (blk >> 1) * ystride;
343 ctx->dsp.put_signed_pixels_clamped(ctx->block, dst,
349 for (blk = 0; blk < 2; blk++) {
350 recombine_block(ctx->block, ctx->scantable.permutated,
352 unquant_block(ctx->block, ctx->quant);
353 ctx->dsp.idct(ctx->block);
354 ctx->dsp.put_signed_pixels_clamped(ctx->block, C[blk],
355 ctx->frame->linesize[blk + 1]);
363 static int aic_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
366 AICContext *ctx = avctx->priv_data;
367 const uint8_t *buf = avpkt->data;
368 int buf_size = avpkt->size;
375 ctx->frame->pict_type = AV_PICTURE_TYPE_I;
376 ctx->frame->key_frame = 1;
378 off = FFALIGN(AIC_HDR_SIZE + ctx->num_x_slices * ctx->mb_height * 2, 4);
380 if (buf_size < off) {
381 av_log(avctx, AV_LOG_ERROR, "Too small frame\n");
382 return AVERROR_INVALIDDATA;
385 if ((ret = aic_decode_header(ctx, buf, buf_size)) < 0)
388 if ((ret = ff_get_buffer(avctx, ctx->frame, 0)) < 0)
391 bytestream2_init(&gb, buf + AIC_HDR_SIZE,
392 ctx->num_x_slices * ctx->mb_height * 2);
394 for (y = 0; y < ctx->mb_height; y++) {
395 for (x = 0; x < ctx->mb_width; x += ctx->slice_width) {
396 slice_size = bytestream2_get_le16(&gb) * 4;
397 if (slice_size + off > buf_size || !slice_size) {
398 av_log(avctx, AV_LOG_ERROR, "Incorrect slice size\n");
399 return AVERROR_INVALIDDATA;
402 if ((ret = aic_decode_slice(ctx, x, y,
403 buf + off, slice_size)) < 0)
415 static av_cold int aic_decode_init(AVCodecContext *avctx)
417 AICContext *ctx = avctx->priv_data;
423 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
425 ff_dsputil_init(&ctx->dsp, avctx);
427 for (i = 0; i < 64; i++)
429 ff_init_scantable(ctx->dsp.idct_permutation, &ctx->scantable, scan);
431 ctx->mb_width = FFALIGN(avctx->width, 16) >> 4;
432 ctx->mb_height = FFALIGN(avctx->height, 16) >> 4;
434 ctx->num_x_slices = 16;
435 ctx->slice_width = ctx->mb_width / 16;
436 for (i = 1; i < 32; i++) {
437 if (!(ctx->mb_width % i) && (ctx->mb_width / i < 32)) {
438 ctx->slice_width = ctx->mb_width / i;
439 ctx->num_x_slices = i;
444 ctx->slice_data = av_malloc(ctx->slice_width * AIC_BAND_COEFFS
445 * sizeof(*ctx->slice_data));
446 if (!ctx->slice_data) {
447 av_log(avctx, AV_LOG_ERROR, "Error allocating slice buffer\n");
449 return AVERROR(ENOMEM);
452 for (i = 0; i < NUM_BANDS; i++)
453 ctx->data_ptr[i] = ctx->slice_data + ctx->slice_width
459 static av_cold int aic_decode_close(AVCodecContext *avctx)
461 AICContext *ctx = avctx->priv_data;
463 av_freep(&ctx->slice_data);
468 AVCodec ff_aic_decoder = {
470 .type = AVMEDIA_TYPE_VIDEO,
471 .id = AV_CODEC_ID_AIC,
472 .priv_data_size = sizeof(AICContext),
473 .init = aic_decode_init,
474 .close = aic_decode_close,
475 .decode = aic_decode_frame,
476 .capabilities = CODEC_CAP_DR1,
477 .long_name = NULL_IF_CONFIG_SMALL("Apple Intermediate Codec")