/* * 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;     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);    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,                                     !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,};