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