/* * Apple Intermediate Codec decoder * * Copyright (c) 2013 Konstantin Shishkov * * This file is part of FFmpeg. * * FFmpeg 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. * * FFmpeg 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 FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include <inttypes.h> #include "avcodec.h" #include "bytestream.h" #include "internal.h" #include "get_bits.h" #include "golomb.h" #include "idctdsp.h" #include "thread.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 * const 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; IDCTDSPContext idsp; 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]; DECLARE_ALIGNED(16, uint8_t, quant_matrix)[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 %"PRIu32" 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 force_chroma) { 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 | force_chroma]; int mb, idx; unsigned val; if (get_bits_left(gb) < 5) return AVERROR_INVALIDDATA; 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); if (val >= 0x10000) return AVERROR_INVALIDDATA; 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, uint8_t *quant_matrix) { int i; for (i = 0; i < 64; i++) { int val = (uint16_t)block[i]; int sign = val & 1; block[i] = (((val >> 1) ^ -sign) * q * 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); int last_row = mb_y && mb_y == ctx->mb_height - 1; int y_pos, c_pos; 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]; if (last_row) { y_pos = (ctx->avctx->height - 16); c_pos = ((ctx->avctx->height+1)/2 - 8); } else { y_pos = mb_y * 16; c_pos = mb_y * 8; } Y = ctx->frame->data[0] + mb_x * 16 + y_pos * ystride; for (i = 0; i < 2; i++) C[i] = ctx->frame->data[i + 1] + mb_x * 8 + c_pos * 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, !ctx->interlaced)) < 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->quant_matrix); ctx->idsp.idct(ctx->block); if (!ctx->interlaced) { dst = Y + (blk >> 1) * 8 * ystride + (blk & 1) * 8; ctx->idsp.put_signed_pixels_clamped(ctx->block, dst, ystride); } else { dst = Y + (blk & 1) * 8 + (blk >> 1) * ystride; ctx->idsp.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->quant_matrix); ctx->idsp.idct(ctx->block); ctx->idsp.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; ThreadFrame frame = { .f = data }; 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; } ret = aic_decode_header(ctx, buf, buf_size); if (ret < 0) { av_log(avctx, AV_LOG_ERROR, "Invalid header\n"); return ret; } if ((ret = ff_thread_get_buffer(avctx, &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 %d at %d.%d\n", slice_size, x, y); return AVERROR_INVALIDDATA; } ret = aic_decode_slice(ctx, x, y, buf + off, slice_size); if (ret < 0) { av_log(avctx, AV_LOG_ERROR, "Error decoding slice at %d.%d\n", x, y); 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_idctdsp_init(&ctx->idsp, avctx); for (i = 0; i < 64; i++) scan[i] = i; ff_init_scantable(ctx->idsp.idct_permutation, &ctx->scantable, scan); for (i = 0; i < 64; i++) ctx->quant_matrix[ctx->idsp.idct_permutation[i]] = aic_quant_matrix[i]; ctx->mb_width = FFALIGN(avctx->width, 16) >> 4; ctx->mb_height = FFALIGN(avctx->height, 16) >> 4; ctx->num_x_slices = (ctx->mb_width + 15) >> 4; ctx->slice_width = 16; for (i = 1; i < ctx->mb_width; 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_array(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", .long_name = NULL_IF_CONFIG_SMALL("Apple Intermediate Codec"), .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 = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS, .init_thread_copy = ONLY_IF_THREADS_ENABLED(aic_decode_init), .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, };