FFmpeg coverage

GCC Code Coverage Report

Directory:	../../../ffmpeg/		Exec	Total	Coverage
File:	src/libavcodec/pixlet.c	Lines:	338	408	82.8 %
Date:	2021-01-21 13:05:02	Branches:	114	178	64.0 %


/*
 * Apple Pixlet decoder
 * Copyright (c) 2016 Paul B Mahol
 *
 * 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 <stdint.h>

#include "libavutil/imgutils.h"
#include "libavutil/intmath.h"
#include "libavutil/opt.h"

#include "avcodec.h"
#include "bytestream.h"
#include "get_bits.h"
#include "internal.h"
#include "thread.h"
#include "unary.h"

#define NB_LEVELS 4

#define PIXLET_MAGIC 0xDEADBEEF

#define H 0
#define V 1

typedef struct SubBand {
    unsigned width, height;
    unsigned size;
    unsigned x, y;
} SubBand;

typedef struct PixletContext {
    AVClass *class;

    GetByteContext gb;
    GetBitContext bc;

    int levels;
    int depth;
    int w, h;

    int16_t *filter[2];
    int16_t *prediction;
    int64_t scaling[4][2][NB_LEVELS];
    uint16_t lut[65536];
    SubBand band[4][NB_LEVELS * 3 + 1];
} PixletContext;

static av_cold int pixlet_init(AVCodecContext *avctx)
{
    avctx->pix_fmt     = AV_PIX_FMT_YUV420P16;
    avctx->color_range = AVCOL_RANGE_JPEG;
    return 0;
}

static void free_buffers(AVCodecContext *avctx)
{
    PixletContext *ctx = avctx->priv_data;

    av_freep(&ctx->filter[0]);
    av_freep(&ctx->filter[1]);
    av_freep(&ctx->prediction);
}

static av_cold int pixlet_close(AVCodecContext *avctx)
{
    PixletContext *ctx = avctx->priv_data;
    free_buffers(avctx);
    ctx->w = 0;
    ctx->h = 0;
    return 0;
}

static int init_decoder(AVCodecContext *avctx)
{
    PixletContext *ctx = avctx->priv_data;
    int i, plane;

    ctx->filter[0]  = av_malloc_array(ctx->h, sizeof(int16_t));
    ctx->filter[1]  = av_malloc_array(FFMAX(ctx->h, ctx->w) + 16, sizeof(int16_t));
    ctx->prediction = av_malloc_array((ctx->w >> NB_LEVELS), sizeof(int16_t));
    if (!ctx->filter[0] || !ctx->filter[1] || !ctx->prediction)
        return AVERROR(ENOMEM);

    for (plane = 0; plane < 3; plane++) {
        unsigned shift = plane > 0;
        unsigned w     = ctx->w >> shift;
        unsigned h     = ctx->h >> shift;

        ctx->band[plane][0].width  =  w >> NB_LEVELS;
        ctx->band[plane][0].height =  h >> NB_LEVELS;
        ctx->band[plane][0].size   = (w >> NB_LEVELS) * (h >> NB_LEVELS);

        for (i = 0; i < NB_LEVELS * 3; i++) {
            unsigned scale = ctx->levels - (i / 3);

            ctx->band[plane][i + 1].width  =  w >> scale;
            ctx->band[plane][i + 1].height =  h >> scale;
            ctx->band[plane][i + 1].size   = (w >> scale) * (h >> scale);

            ctx->band[plane][i + 1].x = (w >> scale) * (((i + 1) % 3) != 2);
            ctx->band[plane][i + 1].y = (h >> scale) * (((i + 1) % 3) != 1);
        }
    }

    return 0;
}

static int read_low_coeffs(AVCodecContext *avctx, int16_t *dst, int size,
                           int width, ptrdiff_t stride)
{
    PixletContext *ctx = avctx->priv_data;
    GetBitContext *bc = &ctx->bc;
    unsigned cnt1, nbits, k, j = 0, i = 0;
    int64_t value, state = 3;
    int rlen, escape, flag = 0;

    while (i < size) {
        nbits = FFMIN(ff_clz((state >> 8) + 3) ^ 0x1F, 14);

        cnt1 = get_unary(bc, 0, 8);
        if (cnt1 < 8) {
            value = show_bits(bc, nbits);
            if (value <= 1) {
                skip_bits(bc, nbits - 1);
                escape = ((1 << nbits) - 1) * cnt1;
            } else {
                skip_bits(bc, nbits);
                escape = value + ((1 << nbits) - 1) * cnt1 - 1;
            }
        } else {
            escape = get_bits(bc, 16);
        }

        value    = -((escape + flag) & 1) | 1;
        dst[j++] = value * ((escape + flag + 1) >> 1);
        i++;
        if (j == width) {
            j    = 0;
            dst += stride;
        }
        state = 120 * (escape + flag) + state - (120 * state >> 8);
        flag  = 0;

        if (state * 4ULL > 0xFF || i >= size)
            continue;

        nbits  = ((state + 8) >> 5) + (state ? ff_clz(state) : 32) - 24;
        escape = av_mod_uintp2(16383, nbits);
        cnt1   = get_unary(bc, 0, 8);
        if (cnt1 > 7) {
            rlen = get_bits(bc, 16);
        } else {
            value = show_bits(bc, nbits);
            if (value > 1) {
                skip_bits(bc, nbits);
                rlen = value + escape * cnt1 - 1;
            } else {
                skip_bits(bc, nbits - 1);
                rlen = escape * cnt1;
            }
        }

        if (rlen > size - i)
            return AVERROR_INVALIDDATA;
        i += rlen;

        for (k = 0; k < rlen; k++) {
            dst[j++] = 0;
            if (j == width) {
                j    = 0;
                dst += stride;
            }
        }

        state = 0;
        flag  = rlen < 0xFFFF ? 1 : 0;
    }

    align_get_bits(bc);
    return get_bits_count(bc) >> 3;
}

static int read_high_coeffs(AVCodecContext *avctx, uint8_t *src, int16_t *dst,
                            int size, int c, int a, int d,
                            int width, ptrdiff_t stride)
{
    PixletContext *ctx = avctx->priv_data;
    GetBitContext *bc = &ctx->bc;
    unsigned cnt1, shbits, rlen, nbits, length, i = 0, j = 0, k;
    int ret, escape, pfx, value, yflag, xflag, flag = 0;
    int64_t state = 3, tmp;

    ret = init_get_bits8(bc, src, bytestream2_get_bytes_left(&ctx->gb));
    if (ret < 0)
        return ret;

    if (a ^ (a >> 31)) {
        nbits = 33 - ff_clz(a ^ (a >> 31));
        if (nbits > 16)
            return AVERROR_INVALIDDATA;
    } else {
        nbits = 1;
    }

    length = 25 - nbits;

    while (i < size) {
        if (((state >> 8) + 3) & 0xFFFFFFF)
            value = ff_clz((state >> 8) + 3) ^ 0x1F;
        else
            value = -1;

        cnt1 = get_unary(bc, 0, length);
        if (cnt1 >= length) {
            cnt1 = get_bits(bc, nbits);
        } else {
            pfx = 14 + ((((uint64_t)(value - 14)) >> 32) & (value - 14));
            if (pfx < 1 || pfx > 25)
                return AVERROR_INVALIDDATA;
            cnt1 *= (1 << pfx) - 1;
            shbits = show_bits(bc, pfx);
            if (shbits <= 1) {
                skip_bits(bc, pfx - 1);
            } else {
                skip_bits(bc, pfx);
                cnt1 += shbits - 1;
            }
        }

        xflag = flag + cnt1;
        yflag = xflag;

        if (flag + cnt1 == 0) {
            value = 0;
        } else {
            xflag &= 1u;
            tmp    = (int64_t)c * ((yflag + 1) >> 1) + (c >> 1);
            value  = xflag + (tmp ^ -xflag);
        }

        i++;
        dst[j++] = value;
        if (j == width) {
            j    = 0;
            dst += stride;
        }
        state += (int64_t)d * (uint64_t)yflag - ((int64_t)(d * (uint64_t)state) >> 8);

        flag = 0;

        if ((uint64_t)state > 0xFF / 4 || i >= size)
            continue;

        pfx    = ((state + 8) >> 5) + (state ? ff_clz(state) : 32) - 24;
        escape = av_mod_uintp2(16383, pfx);
        cnt1   = get_unary(bc, 0, 8);
        if (cnt1 < 8) {
            if (pfx < 1 || pfx > 25)
                return AVERROR_INVALIDDATA;

            value = show_bits(bc, pfx);
            if (value > 1) {
                skip_bits(bc, pfx);
                rlen = value + escape * cnt1 - 1;
            } else {
                skip_bits(bc, pfx - 1);
                rlen = escape * cnt1;
            }
        } else {
            if (get_bits1(bc))
                value = get_bits(bc, 16);
            else
                value = get_bits(bc, 8);

            rlen = value + 8 * escape;
        }

        if (rlen > 0xFFFF || i + rlen > size)
            return AVERROR_INVALIDDATA;
        i += rlen;

        for (k = 0; k < rlen; k++) {
            dst[j++] = 0;
            if (j == width) {
                j    = 0;
                dst += stride;
            }
        }

        state = 0;
        flag  = rlen < 0xFFFF ? 1 : 0;
    }

    align_get_bits(bc);
    return get_bits_count(bc) >> 3;
}

static int read_highpass(AVCodecContext *avctx, uint8_t *ptr,
                         int plane, AVFrame *frame)
{
    PixletContext *ctx = avctx->priv_data;
    ptrdiff_t stride = frame->linesize[plane] / 2;
    int i, ret;

    for (i = 0; i < ctx->levels * 3; i++) {
        int32_t a = bytestream2_get_be32(&ctx->gb);
        int32_t b = bytestream2_get_be32(&ctx->gb);
        int32_t c = bytestream2_get_be32(&ctx->gb);
        int32_t d = bytestream2_get_be32(&ctx->gb);
        int16_t *dest = (int16_t *)frame->data[plane] +
                        ctx->band[plane][i + 1].x +
                        ctx->band[plane][i + 1].y * stride;
        unsigned size = ctx->band[plane][i + 1].size;
        uint32_t magic = bytestream2_get_be32(&ctx->gb);

        if (magic != PIXLET_MAGIC) {
            av_log(avctx, AV_LOG_ERROR,
                   "wrong magic number: 0x%08"PRIX32" for plane %d, band %d\n",
                   magic, plane, i);
            return AVERROR_INVALIDDATA;
        }

        if (a == INT32_MIN)
            return AVERROR_INVALIDDATA;

        ret = read_high_coeffs(avctx, ptr + bytestream2_tell(&ctx->gb), dest, size,
                               c, (b >= FFABS(a)) ? b : a, d,
                               ctx->band[plane][i + 1].width, stride);
        if (ret < 0) {
            av_log(avctx, AV_LOG_ERROR,
                   "error in highpass coefficients for plane %d, band %d\n",
                   plane, i);
            return ret;
        }
        bytestream2_skip(&ctx->gb, ret);
    }

    return 0;
}

static void lowpass_prediction(int16_t *dst, int16_t *pred,
                               int width, int height, ptrdiff_t stride)
{
    int16_t val;
    int i, j;

    memset(pred, 0, width * sizeof(*pred));

    for (i = 0; i < height; i++) {
        val    = pred[0] + dst[0];
        dst[0] = pred[0] = val;
        for (j = 1; j < width; j++) {
            val     = pred[j] + dst[j];
            dst[j]  = pred[j] = val;
            dst[j] += dst[j-1];
        }
        dst += stride;
    }
}

static void filterfn(int16_t *dest, int16_t *tmp, unsigned size, int64_t scale)
{
    int16_t *low, *high, *ll, *lh, *hl, *hh;
    int hsize, i, j;
    int64_t value;

    hsize = size >> 1;
    low   = tmp + 4;
    high  = &low[hsize + 8];

    memcpy(low, dest, size);
    memcpy(high, dest + hsize, size);

    ll = &low[hsize];
    lh = &low[hsize];
    hl = &high[hsize];
    hh = hl;
    for (i = 4, j = 2; i; i--, j++, ll--, hh++, lh++, hl--) {
        low[i - 5]  = low[j - 1];
        lh[0]       = ll[-1];
        high[i - 5] = high[j - 2];
        hh[0]       = hl[-2];
    }

    for (i = 0; i < hsize; i++) {
        value = (int64_t) low [i + 1] * -INT64_C(325392907)  +
                (int64_t) low [i + 0] *  INT64_C(3687786320) +
                (int64_t) low [i - 1] * -INT64_C(325392907)  +
                (int64_t) high[i + 0] *  INT64_C(1518500249) +
                (int64_t) high[i - 1] *  INT64_C(1518500249);
        dest[i * 2] = av_clip_int16(((value >> 32) * scale) >> 32);
    }

    for (i = 0; i < hsize; i++) {
        value = (int64_t) low [i + 2] * -INT64_C(65078576)   +
                (int64_t) low [i + 1] *  INT64_C(1583578880) +
                (int64_t) low [i + 0] *  INT64_C(1583578880) +
                (int64_t) low [i - 1] * -INT64_C(65078576)   +
                (int64_t) high[i + 1] *  INT64_C(303700064)  +
                (int64_t) high[i + 0] * -INT64_C(3644400640) +
                (int64_t) high[i - 1] *  INT64_C(303700064);
        dest[i * 2 + 1] = av_clip_int16(((value >> 32) * scale) >> 32);
    }
}

static void reconstruction(AVCodecContext *avctx, int16_t *dest,
                           unsigned width, unsigned height, ptrdiff_t stride,
                           int64_t *scaling_h, int64_t *scaling_v)
{
    PixletContext *ctx = avctx->priv_data;
    unsigned scaled_width, scaled_height;
    int16_t *ptr, *tmp;
    int i, j, k;

    scaled_width  = width  >> NB_LEVELS;
    scaled_height = height >> NB_LEVELS;
    tmp           = ctx->filter[0];

    for (i = 0; i < NB_LEVELS; i++) {
        int64_t scale_v = scaling_v[i];
        int64_t scale_h = scaling_h[i];
        scaled_width  <<= 1;
        scaled_height <<= 1;

        ptr = dest;
        for (j = 0; j < scaled_height; j++) {
            filterfn(ptr, ctx->filter[1], scaled_width, scale_v);
            ptr += stride;
        }

        for (j = 0; j < scaled_width; j++) {
            ptr = dest + j;
            for (k = 0; k < scaled_height; k++) {
                tmp[k] = *ptr;
                ptr   += stride;
            }

            filterfn(tmp, ctx->filter[1], scaled_height, scale_h);

            ptr = dest + j;
            for (k = 0; k < scaled_height; k++) {
                *ptr = tmp[k];
                ptr += stride;
            }
        }
    }
}

static void build_luma_lut(AVCodecContext *avctx, int depth)
{
    PixletContext *ctx = avctx->priv_data;
    int max = (1 << depth) - 1;

    if (ctx->depth == depth)
        return;
    ctx->depth = depth;

    for (int i = 0; i < FF_ARRAY_ELEMS(ctx->lut); i++)
        ctx->lut[i] = ((int64_t)i * i * 65535LL) / max / max;
}

static void postprocess_luma(AVCodecContext *avctx, AVFrame *frame,
                             int w, int h, int depth)
{
    PixletContext *ctx = avctx->priv_data;
    uint16_t *dsty = (uint16_t *)frame->data[0];
    int16_t *srcy  = (int16_t *)frame->data[0];
    ptrdiff_t stridey = frame->linesize[0] / 2;
    uint16_t *lut = ctx->lut;
    int i, j;

    for (j = 0; j < h; j++) {
        for (i = 0; i < w; i++) {
            if (srcy[i] <= 0)
                dsty[i] = 0;
            else if (srcy[i] > ((1 << depth) - 1))
                dsty[i] = 65535;
            else
                dsty[i] = lut[srcy[i]];
        }
        dsty += stridey;
        srcy += stridey;
    }
}

static void postprocess_chroma(AVFrame *frame, int w, int h, int depth)
{
    uint16_t *dstu = (uint16_t *)frame->data[1];
    uint16_t *dstv = (uint16_t *)frame->data[2];
    int16_t *srcu  = (int16_t *)frame->data[1];
    int16_t *srcv  = (int16_t *)frame->data[2];
    ptrdiff_t strideu = frame->linesize[1] / 2;
    ptrdiff_t stridev = frame->linesize[2] / 2;
    const unsigned add = 1 << (depth - 1);
    const unsigned shift = 16 - depth;
    int i, j;

    for (j = 0; j < h; j++) {
        for (i = 0; i < w; i++) {
            dstu[i] = av_clip_uintp2_c(add + srcu[i], depth) << shift;
            dstv[i] = av_clip_uintp2_c(add + srcv[i], depth) << shift;
        }
        dstu += strideu;
        dstv += stridev;
        srcu += strideu;
        srcv += stridev;
    }
}

static int decode_plane(AVCodecContext *avctx, int plane,
                        AVPacket *avpkt, AVFrame *frame)
{
    PixletContext *ctx = avctx->priv_data;
    ptrdiff_t stride   = frame->linesize[plane] / 2;
    unsigned shift     = plane > 0;
    int16_t *dst;
    int i, ret;

    for (i = ctx->levels - 1; i >= 0; i--) {
        int32_t h = sign_extend(bytestream2_get_be32(&ctx->gb), 32);
        int32_t v = sign_extend(bytestream2_get_be32(&ctx->gb), 32);

        if (!h || !v)
            return AVERROR_INVALIDDATA;

        ctx->scaling[plane][H][i] = (1000000ULL << 32) / h;
        ctx->scaling[plane][V][i] = (1000000ULL << 32) / v;
    }

    bytestream2_skip(&ctx->gb, 4);

    dst    = (int16_t *)frame->data[plane];
    dst[0] = sign_extend(bytestream2_get_be16(&ctx->gb), 16);

    ret = init_get_bits8(&ctx->bc, avpkt->data + bytestream2_tell(&ctx->gb),
                         bytestream2_get_bytes_left(&ctx->gb));
    if (ret < 0)
        return ret;

    ret = read_low_coeffs(avctx, dst + 1, ctx->band[plane][0].width - 1,
                          ctx->band[plane][0].width - 1, 0);
    if (ret < 0) {
        av_log(avctx, AV_LOG_ERROR,
               "error in lowpass coefficients for plane %d, top row\n", plane);
        return ret;
    }

    ret = read_low_coeffs(avctx, dst + stride,
                          ctx->band[plane][0].height - 1, 1, stride);
    if (ret < 0) {
        av_log(avctx, AV_LOG_ERROR,
               "error in lowpass coefficients for plane %d, left column\n",
               plane);
        return ret;
    }

    ret = read_low_coeffs(avctx, dst + stride + 1,
                          (ctx->band[plane][0].width - 1) * (ctx->band[plane][0].height - 1),
                          ctx->band[plane][0].width - 1, stride);
    if (ret < 0) {
        av_log(avctx, AV_LOG_ERROR,
               "error in lowpass coefficients for plane %d, rest\n", plane);
        return ret;
    }

    bytestream2_skip(&ctx->gb, ret);
    if (bytestream2_get_bytes_left(&ctx->gb) <= 0) {
        av_log(avctx, AV_LOG_ERROR, "no bytes left\n");
        return AVERROR_INVALIDDATA;
    }

    ret = read_highpass(avctx, avpkt->data, plane, frame);
    if (ret < 0)
        return ret;

    lowpass_prediction(dst, ctx->prediction, ctx->band[plane][0].width,
                       ctx->band[plane][0].height, stride);

    reconstruction(avctx, (int16_t *)frame->data[plane], ctx->w >> shift,
                   ctx->h >> shift, stride, ctx->scaling[plane][H],
                   ctx->scaling[plane][V]);

    return 0;
}

static int pixlet_decode_frame(AVCodecContext *avctx, void *data,
                               int *got_frame, AVPacket *avpkt)
{
    PixletContext *ctx = avctx->priv_data;
    int i, w, h, width, height, ret, version;
    AVFrame *p = data;
    ThreadFrame frame = { .f = data };
    uint32_t pktsize, depth;

    bytestream2_init(&ctx->gb, avpkt->data, avpkt->size);

    pktsize = bytestream2_get_be32(&ctx->gb);
    if (pktsize <= 44 || pktsize - 4 > bytestream2_get_bytes_left(&ctx->gb)) {
        av_log(avctx, AV_LOG_ERROR, "Invalid packet size %"PRIu32"\n", pktsize);
        return AVERROR_INVALIDDATA;
    }

    version = bytestream2_get_le32(&ctx->gb);
    if (version != 1)
        avpriv_request_sample(avctx, "Version %d", version);

    bytestream2_skip(&ctx->gb, 4);
    if (bytestream2_get_be32(&ctx->gb) != 1)
        return AVERROR_INVALIDDATA;
    bytestream2_skip(&ctx->gb, 4);

    width  = bytestream2_get_be32(&ctx->gb);
    height = bytestream2_get_be32(&ctx->gb);

    if (    width > INT_MAX - (1U << (NB_LEVELS + 1))
        || height > INT_MAX - (1U << (NB_LEVELS + 1)))
        return AVERROR_INVALIDDATA;

    w = FFALIGN(width,  1 << (NB_LEVELS + 1));
    h = FFALIGN(height, 1 << (NB_LEVELS + 1));

    ctx->levels = bytestream2_get_be32(&ctx->gb);
    if (ctx->levels != NB_LEVELS)
        return AVERROR_INVALIDDATA;
    depth = bytestream2_get_be32(&ctx->gb);
    if (depth < 8 || depth > 15) {
        avpriv_request_sample(avctx, "Depth %d", depth);
        return AVERROR_INVALIDDATA;
    }

    build_luma_lut(avctx, depth);

    ret = ff_set_dimensions(avctx, w, h);
    if (ret < 0)
        return ret;
    avctx->width  = width;
    avctx->height = height;

    if (ctx->w != w || ctx->h != h) {
        free_buffers(avctx);
        ctx->w = w;
        ctx->h = h;

        ret = init_decoder(avctx);
        if (ret < 0) {
            free_buffers(avctx);
            ctx->w = 0;
            ctx->h = 0;
            return ret;
        }
    }

    bytestream2_skip(&ctx->gb, 8);

    p->pict_type = AV_PICTURE_TYPE_I;
    p->key_frame = 1;
    p->color_range = AVCOL_RANGE_JPEG;

    ret = ff_thread_get_buffer(avctx, &frame, 0);
    if (ret < 0)
        return ret;

    for (i = 0; i < 3; i++) {
        ret = decode_plane(avctx, i, avpkt, frame.f);
        if (ret < 0)
            return ret;
        if (avctx->flags & AV_CODEC_FLAG_GRAY)
            break;
    }

    postprocess_luma(avctx, frame.f, ctx->w, ctx->h, ctx->depth);
    postprocess_chroma(frame.f, ctx->w >> 1, ctx->h >> 1, ctx->depth);

    *got_frame = 1;

    return pktsize;
}

AVCodec ff_pixlet_decoder = {
    .name             = "pixlet",
    .long_name        = NULL_IF_CONFIG_SMALL("Apple Pixlet"),
    .type             = AVMEDIA_TYPE_VIDEO,
    .id               = AV_CODEC_ID_PIXLET,
    .init             = pixlet_init,
    .close            = pixlet_close,
    .decode           = pixlet_decode_frame,
    .priv_data_size   = sizeof(PixletContext),
    .capabilities     = AV_CODEC_CAP_DR1 |
                        AV_CODEC_CAP_FRAME_THREADS,
    .caps_internal    = FF_CODEC_CAP_INIT_THREADSAFE |
                        FF_CODEC_CAP_INIT_CLEANUP,
};


Generated by: GCOVR (Version 4.2)

Line	Branch	Exec	Source
1			/*
2			* Apple Pixlet decoder
3			* Copyright (c) 2016 Paul B Mahol
4			*
5			* This file is part of FFmpeg.
6			*
7			* FFmpeg is free software; you can redistribute it and/or
8			* modify it under the terms of the GNU Lesser General Public
9			* License as published by the Free Software Foundation; either
10			* version 2.1 of the License, or (at your option) any later version.
11			*
12			* FFmpeg is distributed in the hope that it will be useful,
13			* but WITHOUT ANY WARRANTY; without even the implied warranty of
14			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15			* Lesser General Public License for more details.
16			*
17			* You should have received a copy of the GNU Lesser General Public
18			* License along with FFmpeg; if not, write to the Free Software
19			* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20			*/
21
22			#include <stdint.h>
23
24			#include "libavutil/imgutils.h"
25			#include "libavutil/intmath.h"
26			#include "libavutil/opt.h"
27
28			#include "avcodec.h"
29			#include "bytestream.h"
30			#include "get_bits.h"
31			#include "internal.h"
32			#include "thread.h"
33			#include "unary.h"
34
35			#define NB_LEVELS 4
36
37			#define PIXLET_MAGIC 0xDEADBEEF
38
39			#define H 0
40			#define V 1
41
42			typedef struct SubBand {
43			unsigned width, height;
44			unsigned size;
45			unsigned x, y;
46			} SubBand;
47
48			typedef struct PixletContext {
49			AVClass *class;
50
51			GetByteContext gb;
52			GetBitContext bc;
53
54			int levels;
55			int depth;
56			int w, h;
57
58			int16_t *filter[2];
59			int16_t *prediction;
60			int64_t scaling[4][2][NB_LEVELS];
61			uint16_t lut[65536];
62			SubBand band[4][NB_LEVELS * 3 + 1];
63			} PixletContext;
64
65		2	static av_cold int pixlet_init(AVCodecContext *avctx)
66			{
67		2	avctx->pix_fmt = AV_PIX_FMT_YUV420P16;
68		2	avctx->color_range = AVCOL_RANGE_JPEG;
69		2	return 0;
70			}
71
72		3	static void free_buffers(AVCodecContext *avctx)
73			{
74		3	PixletContext *ctx = avctx->priv_data;
75
76		3	av_freep(&ctx->filter[0]);
77		3	av_freep(&ctx->filter[1]);
78		3	av_freep(&ctx->prediction);
79		3	}
80
81		2	static av_cold int pixlet_close(AVCodecContext *avctx)
82			{
83		2	PixletContext *ctx = avctx->priv_data;
84		2	free_buffers(avctx);
85		2	ctx->w = 0;
86		2	ctx->h = 0;
87		2	return 0;
88			}
89
90		1	static int init_decoder(AVCodecContext *avctx)
91			{
92		1	PixletContext *ctx = avctx->priv_data;
93			int i, plane;
94
95		1	ctx->filter[0] = av_malloc_array(ctx->h, sizeof(int16_t));
96		1	ctx->filter[1] = av_malloc_array(FFMAX(ctx->h, ctx->w) + 16, sizeof(int16_t));
97		1	ctx->prediction = av_malloc_array((ctx->w >> NB_LEVELS), sizeof(int16_t));
98	✓✗✓✗ ✗✓	1	if (!ctx->filter[0] \|\| !ctx->filter[1] \|\| !ctx->prediction)
99			return AVERROR(ENOMEM);
100
101	✓✓	4	for (plane = 0; plane < 3; plane++) {
102		3	unsigned shift = plane > 0;
103		3	unsigned w = ctx->w >> shift;
104		3	unsigned h = ctx->h >> shift;
105
106		3	ctx->band[plane][0].width = w >> NB_LEVELS;
107		3	ctx->band[plane][0].height = h >> NB_LEVELS;
108		3	ctx->band[plane][0].size = (w >> NB_LEVELS) * (h >> NB_LEVELS);
109
110	✓✓	39	for (i = 0; i < NB_LEVELS * 3; i++) {
111		36	unsigned scale = ctx->levels - (i / 3);
112
113		36	ctx->band[plane][i + 1].width = w >> scale;
114		36	ctx->band[plane][i + 1].height = h >> scale;
115		36	ctx->band[plane][i + 1].size = (w >> scale) * (h >> scale);
116
117		36	ctx->band[plane][i + 1].x = (w >> scale) * (((i + 1) % 3) != 2);
118		36	ctx->band[plane][i + 1].y = (h >> scale) * (((i + 1) % 3) != 1);
119			}
120			}
121
122		1	return 0;
123			}
124
125		9	static int read_low_coeffs(AVCodecContext avctx, int16_t dst, int size,
126			int width, ptrdiff_t stride)
127			{
128		9	PixletContext *ctx = avctx->priv_data;
129		9	GetBitContext *bc = &ctx->bc;
130		9	unsigned cnt1, nbits, k, j = 0, i = 0;
131		9	int64_t value, state = 3;
132		9	int rlen, escape, flag = 0;
133
134	✓✓	12	while (i < size) {
135		3	nbits = FFMIN(ff_clz((state >> 8) + 3) ^ 0x1F, 14);
136
137		3	cnt1 = get_unary(bc, 0, 8);
138	✗✓	3	if (cnt1 < 8) {
139			value = show_bits(bc, nbits);
140			if (value <= 1) {
141			skip_bits(bc, nbits - 1);
142			escape = ((1 << nbits) - 1) * cnt1;
143			} else {
144			skip_bits(bc, nbits);
145			escape = value + ((1 << nbits) - 1) * cnt1 - 1;
146			}
147			} else {
148		3	escape = get_bits(bc, 16);
149			}
150
151		3	value = -((escape + flag) & 1) \| 1;
152		3	dst[j++] = value * ((escape + flag + 1) >> 1);
153		3	i++;
154	✓✗	3	if (j == width) {
155		3	j = 0;
156		3	dst += stride;
157			}
158		3	state = 120 * (escape + flag) + state - (120 * state >> 8);
159		3	flag = 0;
160
161	✗✓✗✗	3	if (state * 4ULL > 0xFF \|\| i >= size)
162		3	continue;
163
164			nbits = ((state + 8) >> 5) + (state ? ff_clz(state) : 32) - 24;
165			escape = av_mod_uintp2(16383, nbits);
166			cnt1 = get_unary(bc, 0, 8);
167			if (cnt1 > 7) {
168			rlen = get_bits(bc, 16);
169			} else {
170			value = show_bits(bc, nbits);
171			if (value > 1) {
172			skip_bits(bc, nbits);
173			rlen = value + escape * cnt1 - 1;
174			} else {
175			skip_bits(bc, nbits - 1);
176			rlen = escape * cnt1;
177			}
178			}
179
180			if (rlen > size - i)
181			return AVERROR_INVALIDDATA;
182			i += rlen;
183
184			for (k = 0; k < rlen; k++) {
185			dst[j++] = 0;
186			if (j == width) {
187			j = 0;
188			dst += stride;
189			}
190			}
191
192			state = 0;
193			flag = rlen < 0xFFFF ? 1 : 0;
194			}
195
196		9	align_get_bits(bc);
197		9	return get_bits_count(bc) >> 3;
198			}
199
200		36	static int read_high_coeffs(AVCodecContext avctx, uint8_t src, int16_t *dst,
201			int size, int c, int a, int d,
202			int width, ptrdiff_t stride)
203			{
204		36	PixletContext *ctx = avctx->priv_data;
205		36	GetBitContext *bc = &ctx->bc;
206		36	unsigned cnt1, shbits, rlen, nbits, length, i = 0, j = 0, k;
207		36	int ret, escape, pfx, value, yflag, xflag, flag = 0;
208		36	int64_t state = 3, tmp;
209
210		36	ret = init_get_bits8(bc, src, bytestream2_get_bytes_left(&ctx->gb));
211	✗✓	36	if (ret < 0)
212			return ret;
213
214	✓✗	36	if (a ^ (a >> 31)) {
215		36	nbits = 33 - ff_clz(a ^ (a >> 31));
216	✗✓	36	if (nbits > 16)
217			return AVERROR_INVALIDDATA;
218			} else {
219			nbits = 1;
220			}
221
222		36	length = 25 - nbits;
223
224	✓✓	751	while (i < size) {
225	✓✗	715	if (((state >> 8) + 3) & 0xFFFFFFF)
226		715	value = ff_clz((state >> 8) + 3) ^ 0x1F;
227			else
228			value = -1;
229
230		715	cnt1 = get_unary(bc, 0, length);
231	✓✓	715	if (cnt1 >= length) {
232		46	cnt1 = get_bits(bc, nbits);
233			} else {
234		669	pfx = 14 + ((((uint64_t)(value - 14)) >> 32) & (value - 14));
235	✓✗✗✓	669	if (pfx < 1 \|\| pfx > 25)
236			return AVERROR_INVALIDDATA;
237		669	cnt1 *= (1 << pfx) - 1;
238		669	shbits = show_bits(bc, pfx);
239	✓✓	669	if (shbits <= 1) {
240		394	skip_bits(bc, pfx - 1);
241			} else {
242		275	skip_bits(bc, pfx);
243		275	cnt1 += shbits - 1;
244			}
245			}
246
247		715	xflag = flag + cnt1;
248		715	yflag = xflag;
249
250	✓✓	715	if (flag + cnt1 == 0) {
251		251	value = 0;
252			} else {
253		464	xflag &= 1u;
254		464	tmp = (int64_t)c * ((yflag + 1) >> 1) + (c >> 1);
255		464	value = xflag + (tmp ^ -xflag);
256			}
257
258		715	i++;
259		715	dst[j++] = value;
260	✓✓	715	if (j == width) {
261		85	j = 0;
262		85	dst += stride;
263			}
264		715	state += (int64_t)d * (uint64_t)yflag - ((int64_t)(d * (uint64_t)state) >> 8);
265
266		715	flag = 0;
267
268	✓✓✓✓	715	if ((uint64_t)state > 0xFF / 4 \|\| i >= size)
269		651	continue;
270
271	✓✗	64	pfx = ((state + 8) >> 5) + (state ? ff_clz(state) : 32) - 24;
272		64	escape = av_mod_uintp2(16383, pfx);
273		64	cnt1 = get_unary(bc, 0, 8);
274	✓✓	64	if (cnt1 < 8) {
275	✓✗✗✓	62	if (pfx < 1 \|\| pfx > 25)
276			return AVERROR_INVALIDDATA;
277
278		62	value = show_bits(bc, pfx);
279	✓✓	62	if (value > 1) {
280		40	skip_bits(bc, pfx);
281		40	rlen = value + escape * cnt1 - 1;
282			} else {
283		22	skip_bits(bc, pfx - 1);
284		22	rlen = escape * cnt1;
285			}
286			} else {
287	✗✓	2	if (get_bits1(bc))
288			value = get_bits(bc, 16);
289			else
290		2	value = get_bits(bc, 8);
291
292		2	rlen = value + 8 * escape;
293			}
294
295	✓✗✗✓	64	if (rlen > 0xFFFF \|\| i + rlen > size)
296			return AVERROR_INVALIDDATA;
297		64	i += rlen;
298
299	✓✓	879	for (k = 0; k < rlen; k++) {
300		815	dst[j++] = 0;
301	✓✓	815	if (j == width) {
302		95	j = 0;
303		95	dst += stride;
304			}
305			}
306
307		64	state = 0;
308		64	flag = rlen < 0xFFFF ? 1 : 0;
309			}
310
311		36	align_get_bits(bc);
312		36	return get_bits_count(bc) >> 3;
313			}
314
315		3	static int read_highpass(AVCodecContext avctx, uint8_t ptr,
316			int plane, AVFrame *frame)
317			{
318		3	PixletContext *ctx = avctx->priv_data;
319		3	ptrdiff_t stride = frame->linesize[plane] / 2;
320			int i, ret;
321
322	✓✓	39	for (i = 0; i < ctx->levels * 3; i++) {
323		36	int32_t a = bytestream2_get_be32(&ctx->gb);
324		36	int32_t b = bytestream2_get_be32(&ctx->gb);
325		36	int32_t c = bytestream2_get_be32(&ctx->gb);
326		36	int32_t d = bytestream2_get_be32(&ctx->gb);
327		36	int16_t dest = (int16_t )frame->data[plane] +
328		36	ctx->band[plane][i + 1].x +
329		36	ctx->band[plane][i + 1].y * stride;
330		36	unsigned size = ctx->band[plane][i + 1].size;
331		36	uint32_t magic = bytestream2_get_be32(&ctx->gb);
332
333	✗✓	36	if (magic != PIXLET_MAGIC) {
334			av_log(avctx, AV_LOG_ERROR,
335			"wrong magic number: 0x%08"PRIX32" for plane %d, band %d\n",
336			magic, plane, i);
337			return AVERROR_INVALIDDATA;
338			}
339
340	✗✓	36	if (a == INT32_MIN)
341			return AVERROR_INVALIDDATA;
342
343		36	ret = read_high_coeffs(avctx, ptr + bytestream2_tell(&ctx->gb), dest, size,
344		36	c, (b >= FFABS(a)) ? b : a, d,
345	✓✓	36	ctx->band[plane][i + 1].width, stride);
346	✗✓	36	if (ret < 0) {
347			av_log(avctx, AV_LOG_ERROR,
348			"error in highpass coefficients for plane %d, band %d\n",
349			plane, i);
350			return ret;
351			}
352		36	bytestream2_skip(&ctx->gb, ret);
353			}
354
355		3	return 0;
356			}
357
358		3	static void lowpass_prediction(int16_t dst, int16_t pred,
359			int width, int height, ptrdiff_t stride)
360			{
361			int16_t val;
362			int i, j;
363
364		3	memset(pred, 0, width * sizeof(*pred));
365
366	✓✓	7	for (i = 0; i < height; i++) {
367		4	val = pred[0] + dst[0];
368		4	dst[0] = pred[0] = val;
369	✓✓	6	for (j = 1; j < width; j++) {
370		2	val = pred[j] + dst[j];
371		2	dst[j] = pred[j] = val;
372		2	dst[j] += dst[j-1];
373			}
374		4	dst += stride;
375			}
376		3	}
377
378		240	static void filterfn(int16_t dest, int16_t tmp, unsigned size, int64_t scale)
379			{
380			int16_t low, high, ll, lh, hl, hh;
381			int hsize, i, j;
382			int64_t value;
383
384		240	hsize = size >> 1;
385		240	low = tmp + 4;
386		240	high = &low[hsize + 8];
387
388		240	memcpy(low, dest, size);
389		240	memcpy(high, dest + hsize, size);
390
391		240	ll = &low[hsize];
392		240	lh = &low[hsize];
393		240	hl = &high[hsize];
394		240	hh = hl;
395	✓✓	1200	for (i = 4, j = 2; i; i--, j++, ll--, hh++, lh++, hl--) {
396		960	low[i - 5] = low[j - 1];
397		960	lh[0] = ll[-1];
398		960	high[i - 5] = high[j - 2];
399		960	hh[0] = hl[-2];
400			}
401
402	✓✓	2280	for (i = 0; i < hsize; i++) {
403		2040	value = (int64_t) low [i + 1] * -INT64_C(325392907) +
404		2040	(int64_t) low [i + 0] * INT64_C(3687786320) +
405		2040	(int64_t) low [i - 1] * -INT64_C(325392907) +
406		2040	(int64_t) high[i + 0] * INT64_C(1518500249) +
407		2040	(int64_t) high[i - 1] * INT64_C(1518500249);
408		2040	dest[i * 2] = av_clip_int16(((value >> 32) * scale) >> 32);
409			}
410
411	✓✓	2280	for (i = 0; i < hsize; i++) {
412		2040	value = (int64_t) low [i + 2] * -INT64_C(65078576) +
413		2040	(int64_t) low [i + 1] * INT64_C(1583578880) +
414		2040	(int64_t) low [i + 0] * INT64_C(1583578880) +
415		2040	(int64_t) low [i - 1] * -INT64_C(65078576) +
416		2040	(int64_t) high[i + 1] * INT64_C(303700064) +
417		2040	(int64_t) high[i + 0] * -INT64_C(3644400640) +
418		2040	(int64_t) high[i - 1] * INT64_C(303700064);
419		2040	dest[i * 2 + 1] = av_clip_int16(((value >> 32) * scale) >> 32);
420			}
421		240	}
422
423		3	static void reconstruction(AVCodecContext avctx, int16_t dest,
424			unsigned width, unsigned height, ptrdiff_t stride,
425			int64_t scaling_h, int64_t scaling_v)
426			{
427		3	PixletContext *ctx = avctx->priv_data;
428			unsigned scaled_width, scaled_height;
429			int16_t ptr, tmp;
430			int i, j, k;
431
432		3	scaled_width = width >> NB_LEVELS;
433		3	scaled_height = height >> NB_LEVELS;
434		3	tmp = ctx->filter[0];
435
436	✓✓	15	for (i = 0; i < NB_LEVELS; i++) {
437		12	int64_t scale_v = scaling_v[i];
438		12	int64_t scale_h = scaling_h[i];
439		12	scaled_width <<= 1;
440		12	scaled_height <<= 1;
441
442		12	ptr = dest;
443	✓✓	132	for (j = 0; j < scaled_height; j++) {
444		120	filterfn(ptr, ctx->filter[1], scaled_width, scale_v);
445		120	ptr += stride;
446			}
447
448	✓✓	132	for (j = 0; j < scaled_width; j++) {
449		120	ptr = dest + j;
450	✓✓	2160	for (k = 0; k < scaled_height; k++) {
451		2040	tmp[k] = *ptr;
452		2040	ptr += stride;
453			}
454
455		120	filterfn(tmp, ctx->filter[1], scaled_height, scale_h);
456
457		120	ptr = dest + j;
458	✓✓	2160	for (k = 0; k < scaled_height; k++) {
459		2040	*ptr = tmp[k];
460		2040	ptr += stride;
461			}
462			}
463			}
464		3	}
465
466		1	static void build_luma_lut(AVCodecContext *avctx, int depth)
467			{
468		1	PixletContext *ctx = avctx->priv_data;
469		1	int max = (1 << depth) - 1;
470
471	✗✓	1	if (ctx->depth == depth)
472			return;
473		1	ctx->depth = depth;
474
475	✓✓	65537	for (int i = 0; i < FF_ARRAY_ELEMS(ctx->lut); i++)
476		65536	ctx->lut[i] = ((int64_t)i * i * 65535LL) / max / max;
477			}
478
479		1	static void postprocess_luma(AVCodecContext avctx, AVFrame frame,
480			int w, int h, int depth)
481			{
482		1	PixletContext *ctx = avctx->priv_data;
483		1	uint16_t dsty = (uint16_t )frame->data[0];
484		1	int16_t srcy = (int16_t )frame->data[0];
485		1	ptrdiff_t stridey = frame->linesize[0] / 2;
486		1	uint16_t *lut = ctx->lut;
487			int i, j;
488
489	✓✓	33	for (j = 0; j < h; j++) {
490	✓✓	1056	for (i = 0; i < w; i++) {
491	✓✓	1024	if (srcy[i] <= 0)
492		1	dsty[i] = 0;
493	✗✓	1023	else if (srcy[i] > ((1 << depth) - 1))
494			dsty[i] = 65535;
495			else
496		1023	dsty[i] = lut[srcy[i]];
497			}
498		32	dsty += stridey;
499		32	srcy += stridey;
500			}
501		1	}
502
503		1	static void postprocess_chroma(AVFrame *frame, int w, int h, int depth)
504			{
505		1	uint16_t dstu = (uint16_t )frame->data[1];
506		1	uint16_t dstv = (uint16_t )frame->data[2];
507		1	int16_t srcu = (int16_t )frame->data[1];
508		1	int16_t srcv = (int16_t )frame->data[2];
509		1	ptrdiff_t strideu = frame->linesize[1] / 2;
510		1	ptrdiff_t stridev = frame->linesize[2] / 2;
511		1	const unsigned add = 1 << (depth - 1);
512		1	const unsigned shift = 16 - depth;
513			int i, j;
514
515	✓✓	17	for (j = 0; j < h; j++) {
516	✓✓	272	for (i = 0; i < w; i++) {
517		256	dstu[i] = av_clip_uintp2_c(add + srcu[i], depth) << shift;
518		256	dstv[i] = av_clip_uintp2_c(add + srcv[i], depth) << shift;
519			}
520		16	dstu += strideu;
521		16	dstv += stridev;
522		16	srcu += strideu;
523		16	srcv += stridev;
524			}
525		1	}
526
527		3	static int decode_plane(AVCodecContext *avctx, int plane,
528			AVPacket avpkt, AVFrame frame)
529			{
530		3	PixletContext *ctx = avctx->priv_data;
531		3	ptrdiff_t stride = frame->linesize[plane] / 2;
532		3	unsigned shift = plane > 0;
533			int16_t *dst;
534			int i, ret;
535
536	✓✓	15	for (i = ctx->levels - 1; i >= 0; i--) {
537		12	int32_t h = sign_extend(bytestream2_get_be32(&ctx->gb), 32);
538		12	int32_t v = sign_extend(bytestream2_get_be32(&ctx->gb), 32);
539
540	✓✗✗✓	12	if (!h \|\| !v)
541			return AVERROR_INVALIDDATA;
542
543		12	ctx->scaling[plane][H][i] = (1000000ULL << 32) / h;
544		12	ctx->scaling[plane][V][i] = (1000000ULL << 32) / v;
545			}
546
547		3	bytestream2_skip(&ctx->gb, 4);
548
549		3	dst = (int16_t *)frame->data[plane];
550		3	dst[0] = sign_extend(bytestream2_get_be16(&ctx->gb), 16);
551
552		3	ret = init_get_bits8(&ctx->bc, avpkt->data + bytestream2_tell(&ctx->gb),
553			bytestream2_get_bytes_left(&ctx->gb));
554	✗✓	3	if (ret < 0)
555			return ret;
556
557		3	ret = read_low_coeffs(avctx, dst + 1, ctx->band[plane][0].width - 1,
558		3	ctx->band[plane][0].width - 1, 0);
559	✗✓	3	if (ret < 0) {
560			av_log(avctx, AV_LOG_ERROR,
561			"error in lowpass coefficients for plane %d, top row\n", plane);
562			return ret;
563			}
564
565		3	ret = read_low_coeffs(avctx, dst + stride,
566		3	ctx->band[plane][0].height - 1, 1, stride);
567	✗✓	3	if (ret < 0) {
568			av_log(avctx, AV_LOG_ERROR,
569			"error in lowpass coefficients for plane %d, left column\n",
570			plane);
571			return ret;
572			}
573
574		3	ret = read_low_coeffs(avctx, dst + stride + 1,
575		3	(ctx->band[plane][0].width - 1) * (ctx->band[plane][0].height - 1),
576		3	ctx->band[plane][0].width - 1, stride);
577	✗✓	3	if (ret < 0) {
578			av_log(avctx, AV_LOG_ERROR,
579			"error in lowpass coefficients for plane %d, rest\n", plane);
580			return ret;
581			}
582
583		3	bytestream2_skip(&ctx->gb, ret);
584	✗✓	3	if (bytestream2_get_bytes_left(&ctx->gb) <= 0) {
585			av_log(avctx, AV_LOG_ERROR, "no bytes left\n");
586			return AVERROR_INVALIDDATA;
587			}
588
589		3	ret = read_highpass(avctx, avpkt->data, plane, frame);
590	✗✓	3	if (ret < 0)
591			return ret;
592
593		3	lowpass_prediction(dst, ctx->prediction, ctx->band[plane][0].width,
594		3	ctx->band[plane][0].height, stride);
595
596		3	reconstruction(avctx, (int16_t *)frame->data[plane], ctx->w >> shift,
597		3	ctx->h >> shift, stride, ctx->scaling[plane][H],
598		3	ctx->scaling[plane][V]);
599
600		3	return 0;
601			}
602
603		1	static int pixlet_decode_frame(AVCodecContext avctx, void data,
604			int got_frame, AVPacket avpkt)
605			{
606		1	PixletContext *ctx = avctx->priv_data;
607			int i, w, h, width, height, ret, version;
608		1	AVFrame *p = data;
609		1	ThreadFrame frame = { .f = data };
610			uint32_t pktsize, depth;
611
612		1	bytestream2_init(&ctx->gb, avpkt->data, avpkt->size);
613
614		1	pktsize = bytestream2_get_be32(&ctx->gb);
615	✓✗✗✓	1	if (pktsize <= 44 \|\| pktsize - 4 > bytestream2_get_bytes_left(&ctx->gb)) {
616			av_log(avctx, AV_LOG_ERROR, "Invalid packet size %"PRIu32"\n", pktsize);
617			return AVERROR_INVALIDDATA;
618			}
619
620		1	version = bytestream2_get_le32(&ctx->gb);
621	✗✓	1	if (version != 1)
622			avpriv_request_sample(avctx, "Version %d", version);
623
624		1	bytestream2_skip(&ctx->gb, 4);
625	✗✓	1	if (bytestream2_get_be32(&ctx->gb) != 1)
626			return AVERROR_INVALIDDATA;
627		1	bytestream2_skip(&ctx->gb, 4);
628
629		1	width = bytestream2_get_be32(&ctx->gb);
630		1	height = bytestream2_get_be32(&ctx->gb);
631
632	✓✗	1	if ( width > INT_MAX - (1U << (NB_LEVELS + 1))
633	✗✓	1	\|\| height > INT_MAX - (1U << (NB_LEVELS + 1)))
634			return AVERROR_INVALIDDATA;
635
636		1	w = FFALIGN(width, 1 << (NB_LEVELS + 1));
637		1	h = FFALIGN(height, 1 << (NB_LEVELS + 1));
638
639		1	ctx->levels = bytestream2_get_be32(&ctx->gb);
640	✗✓	1	if (ctx->levels != NB_LEVELS)
641			return AVERROR_INVALIDDATA;
642		1	depth = bytestream2_get_be32(&ctx->gb);
643	✓✗✗✓	1	if (depth < 8 \|\| depth > 15) {
644			avpriv_request_sample(avctx, "Depth %d", depth);
645			return AVERROR_INVALIDDATA;
646			}
647
648		1	build_luma_lut(avctx, depth);
649
650		1	ret = ff_set_dimensions(avctx, w, h);
651	✗✓	1	if (ret < 0)
652			return ret;
653		1	avctx->width = width;
654		1	avctx->height = height;
655
656	✗✓✗✗	1	if (ctx->w != w \|\| ctx->h != h) {
657		1	free_buffers(avctx);
658		1	ctx->w = w;
659		1	ctx->h = h;
660
661		1	ret = init_decoder(avctx);
662	✗✓	1	if (ret < 0) {
663			free_buffers(avctx);
664			ctx->w = 0;
665			ctx->h = 0;
666			return ret;
667			}
668			}
669
670		1	bytestream2_skip(&ctx->gb, 8);
671
672		1	p->pict_type = AV_PICTURE_TYPE_I;
673		1	p->key_frame = 1;
674		1	p->color_range = AVCOL_RANGE_JPEG;
675
676		1	ret = ff_thread_get_buffer(avctx, &frame, 0);
677	✗✓	1	if (ret < 0)
678			return ret;
679
680	✓✓	4	for (i = 0; i < 3; i++) {
681		3	ret = decode_plane(avctx, i, avpkt, frame.f);
682	✗✓	3	if (ret < 0)
683			return ret;
684	✗✓	3	if (avctx->flags & AV_CODEC_FLAG_GRAY)
685			break;
686			}
687
688		1	postprocess_luma(avctx, frame.f, ctx->w, ctx->h, ctx->depth);
689		1	postprocess_chroma(frame.f, ctx->w >> 1, ctx->h >> 1, ctx->depth);
690
691		1	*got_frame = 1;
692
693		1	return pktsize;
694			}
695
696			AVCodec ff_pixlet_decoder = {
697			.name = "pixlet",
698			.long_name = NULL_IF_CONFIG_SMALL("Apple Pixlet"),
699			.type = AVMEDIA_TYPE_VIDEO,
700			.id = AV_CODEC_ID_PIXLET,
701			.init = pixlet_init,
702			.close = pixlet_close,
703			.decode = pixlet_decode_frame,
704			.priv_data_size = sizeof(PixletContext),
705			.capabilities = AV_CODEC_CAP_DR1 \|
706			AV_CODEC_CAP_FRAME_THREADS,
707			.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE \|
708			FF_CODEC_CAP_INIT_CLEANUP,
709			};