mirror of
https://github.com/FFmpeg/FFmpeg.git
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482 lines
15 KiB
C
482 lines
15 KiB
C
/*
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* Apple Intermediate Codec decoder
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*
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* Copyright (c) 2013 Konstantin Shishkov
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avcodec.h"
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#include "bytestream.h"
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#include "dsputil.h"
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#include "internal.h"
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#include "get_bits.h"
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#include "golomb.h"
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#include "unary.h"
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#define AIC_HDR_SIZE 24
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#define AIC_BAND_COEFFS (64 + 32 + 192 + 96)
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enum AICBands {
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COEFF_LUMA = 0,
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COEFF_CHROMA,
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COEFF_LUMA_EXT,
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COEFF_CHROMA_EXT,
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NUM_BANDS
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};
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static const int aic_num_band_coeffs[NUM_BANDS] = { 64, 32, 192, 96 };
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static const int aic_band_off[NUM_BANDS] = { 0, 64, 96, 288 };
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static const uint8_t aic_quant_matrix[64] = {
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8, 16, 19, 22, 22, 26, 26, 27,
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16, 16, 22, 22, 26, 27, 27, 29,
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19, 22, 26, 26, 27, 29, 29, 35,
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22, 24, 27, 27, 29, 32, 34, 38,
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26, 27, 29, 29, 32, 35, 38, 46,
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27, 29, 34, 34, 35, 40, 46, 56,
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29, 34, 34, 37, 40, 48, 56, 69,
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34, 37, 38, 40, 48, 58, 69, 83,
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};
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static const uint8_t aic_y_scan[64] = {
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0, 4, 1, 2, 5, 8, 12, 9,
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6, 3, 7, 10, 13, 14, 11, 15,
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47, 43, 46, 45, 42, 39, 35, 38,
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41, 44, 40, 37, 34, 33, 36, 32,
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16, 20, 17, 18, 21, 24, 28, 25,
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22, 19, 23, 26, 29, 30, 27, 31,
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63, 59, 62, 61, 58, 55, 51, 54,
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57, 60, 56, 53, 50, 49, 52, 48,
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};
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static const uint8_t aic_y_ext_scan[192] = {
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64, 72, 65, 66, 73, 80, 88, 81,
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74, 67, 75, 82, 89, 90, 83, 91,
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0, 4, 1, 2, 5, 8, 12, 9,
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6, 3, 7, 10, 13, 14, 11, 15,
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16, 20, 17, 18, 21, 24, 28, 25,
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22, 19, 23, 26, 29, 30, 27, 31,
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155, 147, 154, 153, 146, 139, 131, 138,
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145, 152, 144, 137, 130, 129, 136, 128,
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47, 43, 46, 45, 42, 39, 35, 38,
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41, 44, 40, 37, 34, 33, 36, 32,
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63, 59, 62, 61, 58, 55, 51, 54,
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57, 60, 56, 53, 50, 49, 52, 48,
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96, 104, 97, 98, 105, 112, 120, 113,
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106, 99, 107, 114, 121, 122, 115, 123,
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68, 76, 69, 70, 77, 84, 92, 85,
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78, 71, 79, 86, 93, 94, 87, 95,
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100, 108, 101, 102, 109, 116, 124, 117,
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110, 103, 111, 118, 125, 126, 119, 127,
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187, 179, 186, 185, 178, 171, 163, 170,
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177, 184, 176, 169, 162, 161, 168, 160,
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159, 151, 158, 157, 150, 143, 135, 142,
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149, 156, 148, 141, 134, 133, 140, 132,
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191, 183, 190, 189, 182, 175, 167, 174,
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181, 188, 180, 173, 166, 165, 172, 164,
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};
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static const uint8_t aic_c_scan[64] = {
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0, 4, 1, 2, 5, 8, 12, 9,
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6, 3, 7, 10, 13, 14, 11, 15,
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31, 27, 30, 29, 26, 23, 19, 22,
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25, 28, 24, 21, 18, 17, 20, 16,
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32, 36, 33, 34, 37, 40, 44, 41,
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38, 35, 39, 42, 45, 46, 43, 47,
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63, 59, 62, 61, 58, 55, 51, 54,
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57, 60, 56, 53, 50, 49, 52, 48,
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};
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static const uint8_t aic_c_ext_scan[192] = {
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16, 24, 17, 18, 25, 32, 40, 33,
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26, 19, 27, 34, 41, 42, 35, 43,
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0, 4, 1, 2, 5, 8, 12, 9,
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6, 3, 7, 10, 13, 14, 11, 15,
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20, 28, 21, 22, 29, 36, 44, 37,
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30, 23, 31, 38, 45, 46, 39, 47,
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95, 87, 94, 93, 86, 79, 71, 78,
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85, 92, 84, 77, 70, 69, 76, 68,
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63, 59, 62, 61, 58, 55, 51, 54,
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57, 60, 56, 53, 50, 49, 52, 48,
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91, 83, 90, 89, 82, 75, 67, 74,
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81, 88, 80, 73, 66, 65, 72, 64,
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112, 120, 113, 114, 121, 128, 136, 129,
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122, 115, 123, 130, 137, 138, 131, 139,
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96, 100, 97, 98, 101, 104, 108, 105,
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102, 99, 103, 106, 109, 110, 107, 111,
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116, 124, 117, 118, 125, 132, 140, 133,
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126, 119, 127, 134, 141, 142, 135, 143,
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191, 183, 190, 189, 182, 175, 167, 174,
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181, 188, 180, 173, 166, 165, 172, 164,
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159, 155, 158, 157, 154, 151, 147, 150,
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153, 156, 152, 149, 146, 145, 148, 144,
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187, 179, 186, 185, 178, 171, 163, 170,
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177, 184, 176, 169, 162, 161, 168, 160,
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};
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static const uint8_t *aic_scan[NUM_BANDS] = {
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aic_y_scan, aic_c_scan, aic_y_ext_scan, aic_c_ext_scan
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};
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typedef struct AICContext {
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AVCodecContext *avctx;
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AVFrame *frame;
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DSPContext dsp;
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ScanTable scantable;
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int num_x_slices;
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int slice_width;
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int mb_width, mb_height;
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int quant;
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int interlaced;
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int16_t *slice_data;
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int16_t *data_ptr[NUM_BANDS];
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DECLARE_ALIGNED(16, int16_t, block)[64];
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} AICContext;
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static int aic_decode_header(AICContext *ctx, const uint8_t *src, int size)
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{
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uint32_t frame_size;
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int width, height;
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if (src[0] != 1) {
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av_log(ctx->avctx, AV_LOG_ERROR, "Invalid version %d\n", src[0]);
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return AVERROR_INVALIDDATA;
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}
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if (src[1] != AIC_HDR_SIZE - 2) {
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av_log(ctx->avctx, AV_LOG_ERROR, "Invalid header size %d\n", src[1]);
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return AVERROR_INVALIDDATA;
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}
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frame_size = AV_RB32(src + 2);
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width = AV_RB16(src + 6);
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height = AV_RB16(src + 8);
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if (frame_size > size) {
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av_log(ctx->avctx, AV_LOG_ERROR, "Frame size should be %d got %d\n",
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frame_size, size);
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return AVERROR_INVALIDDATA;
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}
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if (width != ctx->avctx->width || height != ctx->avctx->height) {
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av_log(ctx->avctx, AV_LOG_ERROR,
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"Picture dimension changed: old: %d x %d, new: %d x %d\n",
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ctx->avctx->width, ctx->avctx->height, width, height);
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return AVERROR_INVALIDDATA;
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}
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ctx->quant = src[15];
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ctx->interlaced = ((src[16] >> 4) == 3);
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return 0;
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}
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#define GET_CODE(val, type, add_bits) \
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do { \
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if (type) \
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val = get_ue_golomb(gb); \
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else \
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val = get_unary(gb, 1, 31); \
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if (add_bits) \
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val = (val << add_bits) + get_bits(gb, add_bits); \
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} while (0)
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static int aic_decode_coeffs(GetBitContext *gb, int16_t *dst,
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int band, int slice_width, int force_chroma)
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{
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int has_skips, coeff_type, coeff_bits, skip_type, skip_bits;
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const int num_coeffs = aic_num_band_coeffs[band];
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const uint8_t *scan = aic_scan[band | force_chroma];
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int mb, idx;
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unsigned val;
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has_skips = get_bits1(gb);
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coeff_type = get_bits1(gb);
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coeff_bits = get_bits(gb, 3);
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if (has_skips) {
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skip_type = get_bits1(gb);
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skip_bits = get_bits(gb, 3);
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for (mb = 0; mb < slice_width; mb++) {
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idx = -1;
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do {
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GET_CODE(val, skip_type, skip_bits);
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if (val >= 0x10000)
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return AVERROR_INVALIDDATA;
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idx += val + 1;
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if (idx >= num_coeffs)
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break;
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GET_CODE(val, coeff_type, coeff_bits);
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val++;
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if (val >= 0x10000)
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return AVERROR_INVALIDDATA;
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dst[scan[idx]] = val;
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} while (idx < num_coeffs - 1);
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dst += num_coeffs;
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}
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} else {
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for (mb = 0; mb < slice_width; mb++) {
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for (idx = 0; idx < num_coeffs; idx++) {
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GET_CODE(val, coeff_type, coeff_bits);
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if (val >= 0x10000)
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return AVERROR_INVALIDDATA;
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dst[scan[idx]] = val;
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}
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dst += num_coeffs;
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}
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}
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return 0;
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}
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static void recombine_block(int16_t *dst, const uint8_t *scan,
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int16_t **base, int16_t **ext)
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{
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int i, j;
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for (i = 0; i < 4; i++) {
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for (j = 0; j < 4; j++)
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dst[scan[i * 8 + j]] = (*base)[j];
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for (j = 0; j < 4; j++)
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dst[scan[i * 8 + j + 4]] = (*ext)[j];
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*base += 4;
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*ext += 4;
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}
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for (; i < 8; i++) {
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for (j = 0; j < 8; j++)
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dst[scan[i * 8 + j]] = (*ext)[j];
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*ext += 8;
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}
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}
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static void recombine_block_il(int16_t *dst, const uint8_t *scan,
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int16_t **base, int16_t **ext,
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int block_no)
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{
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int i, j;
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if (block_no < 2) {
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for (i = 0; i < 8; i++) {
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for (j = 0; j < 4; j++)
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dst[scan[i * 8 + j]] = (*base)[j];
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for (j = 0; j < 4; j++)
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dst[scan[i * 8 + j + 4]] = (*ext)[j];
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*base += 4;
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*ext += 4;
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}
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} else {
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for (i = 0; i < 64; i++)
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dst[scan[i]] = (*ext)[i];
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*ext += 64;
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}
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}
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static void unquant_block(int16_t *block, int q)
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{
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int i;
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for (i = 0; i < 64; i++) {
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int val = (uint16_t)block[i];
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int sign = val & 1;
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block[i] = (((val >> 1) ^ -sign) * q * aic_quant_matrix[i] >> 4)
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+ sign;
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}
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}
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static int aic_decode_slice(AICContext *ctx, int mb_x, int mb_y,
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const uint8_t *src, int src_size)
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{
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GetBitContext gb;
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int ret, i, mb, blk;
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int slice_width = FFMIN(ctx->slice_width, ctx->mb_width - mb_x);
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uint8_t *Y, *C[2];
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uint8_t *dst;
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int16_t *base_y = ctx->data_ptr[COEFF_LUMA];
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int16_t *base_c = ctx->data_ptr[COEFF_CHROMA];
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int16_t *ext_y = ctx->data_ptr[COEFF_LUMA_EXT];
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int16_t *ext_c = ctx->data_ptr[COEFF_CHROMA_EXT];
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const int ystride = ctx->frame->linesize[0];
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Y = ctx->frame->data[0] + mb_x * 16 + mb_y * 16 * ystride;
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for (i = 0; i < 2; i++)
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C[i] = ctx->frame->data[i + 1] + mb_x * 8
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+ mb_y * 8 * ctx->frame->linesize[i + 1];
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init_get_bits(&gb, src, src_size * 8);
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memset(ctx->slice_data, 0,
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sizeof(*ctx->slice_data) * slice_width * AIC_BAND_COEFFS);
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for (i = 0; i < NUM_BANDS; i++)
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if ((ret = aic_decode_coeffs(&gb, ctx->data_ptr[i],
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i, slice_width,
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!ctx->interlaced)) < 0)
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return ret;
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for (mb = 0; mb < slice_width; mb++) {
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for (blk = 0; blk < 4; blk++) {
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if (!ctx->interlaced)
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recombine_block(ctx->block, ctx->scantable.permutated,
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&base_y, &ext_y);
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else
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recombine_block_il(ctx->block, ctx->scantable.permutated,
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&base_y, &ext_y, blk);
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unquant_block(ctx->block, ctx->quant);
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ctx->dsp.idct(ctx->block);
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if (!ctx->interlaced) {
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dst = Y + (blk >> 1) * 8 * ystride + (blk & 1) * 8;
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ctx->dsp.put_signed_pixels_clamped(ctx->block, dst,
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ystride);
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} else {
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dst = Y + (blk & 1) * 8 + (blk >> 1) * ystride;
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ctx->dsp.put_signed_pixels_clamped(ctx->block, dst,
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ystride * 2);
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}
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}
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Y += 16;
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for (blk = 0; blk < 2; blk++) {
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recombine_block(ctx->block, ctx->scantable.permutated,
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&base_c, &ext_c);
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unquant_block(ctx->block, ctx->quant);
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ctx->dsp.idct(ctx->block);
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ctx->dsp.put_signed_pixels_clamped(ctx->block, C[blk],
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ctx->frame->linesize[blk + 1]);
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C[blk] += 8;
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}
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}
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return 0;
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}
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static int aic_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
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AVPacket *avpkt)
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{
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AICContext *ctx = avctx->priv_data;
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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GetByteContext gb;
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uint32_t off;
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int x, y, ret;
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int slice_size;
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ctx->frame = data;
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ctx->frame->pict_type = AV_PICTURE_TYPE_I;
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ctx->frame->key_frame = 1;
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off = FFALIGN(AIC_HDR_SIZE + ctx->num_x_slices * ctx->mb_height * 2, 4);
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if (buf_size < off) {
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av_log(avctx, AV_LOG_ERROR, "Too small frame\n");
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return AVERROR_INVALIDDATA;
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}
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if ((ret = aic_decode_header(ctx, buf, buf_size)) < 0)
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return ret;
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if ((ret = ff_get_buffer(avctx, ctx->frame, 0)) < 0)
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return ret;
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bytestream2_init(&gb, buf + AIC_HDR_SIZE,
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ctx->num_x_slices * ctx->mb_height * 2);
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for (y = 0; y < ctx->mb_height; y++) {
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for (x = 0; x < ctx->mb_width; x += ctx->slice_width) {
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slice_size = bytestream2_get_le16(&gb) * 4;
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if (slice_size + off > buf_size || !slice_size) {
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av_log(avctx, AV_LOG_ERROR, "Incorrect slice size\n");
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return AVERROR_INVALIDDATA;
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}
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if ((ret = aic_decode_slice(ctx, x, y,
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buf + off, slice_size)) < 0)
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return ret;
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off += slice_size;
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}
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}
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*got_frame = 1;
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return avpkt->size;
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}
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static av_cold int aic_decode_init(AVCodecContext *avctx)
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{
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AICContext *ctx = avctx->priv_data;
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int i;
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uint8_t scan[64];
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ctx->avctx = avctx;
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avctx->pix_fmt = AV_PIX_FMT_YUV420P;
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ff_dsputil_init(&ctx->dsp, avctx);
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for (i = 0; i < 64; i++)
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scan[i] = i;
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ff_init_scantable(ctx->dsp.idct_permutation, &ctx->scantable, scan);
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ctx->mb_width = FFALIGN(avctx->width, 16) >> 4;
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ctx->mb_height = FFALIGN(avctx->height, 16) >> 4;
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ctx->num_x_slices = 16;
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ctx->slice_width = ctx->mb_width / 16;
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for (i = 1; i < 32; i++) {
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if (!(ctx->mb_width % i) && (ctx->mb_width / i < 32)) {
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ctx->slice_width = ctx->mb_width / i;
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ctx->num_x_slices = i;
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break;
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}
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}
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ctx->slice_data = av_malloc(ctx->slice_width * AIC_BAND_COEFFS
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* sizeof(*ctx->slice_data));
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if (!ctx->slice_data) {
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av_log(avctx, AV_LOG_ERROR, "Error allocating slice buffer\n");
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return AVERROR(ENOMEM);
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}
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for (i = 0; i < NUM_BANDS; i++)
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ctx->data_ptr[i] = ctx->slice_data + ctx->slice_width
|
|
* aic_band_off[i];
|
|
|
|
return 0;
|
|
}
|
|
|
|
static av_cold int aic_decode_close(AVCodecContext *avctx)
|
|
{
|
|
AICContext *ctx = avctx->priv_data;
|
|
|
|
av_freep(&ctx->slice_data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVCodec ff_aic_decoder = {
|
|
.name = "aic",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_AIC,
|
|
.priv_data_size = sizeof(AICContext),
|
|
.init = aic_decode_init,
|
|
.close = aic_decode_close,
|
|
.decode = aic_decode_frame,
|
|
.capabilities = CODEC_CAP_DR1,
|
|
.long_name = NULL_IF_CONFIG_SMALL("Apple Intermediate Codec")
|
|
};
|