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/*
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 * Copyright (C) 2007 Marco Gerards <marco@gnu.org>
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 * Copyright (C) 2009 David Conrad
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 *
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 * This file is part of Libav.
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 *
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 * Libav 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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 * Libav 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 Libav; 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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/**
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 * @file
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 * Dirac Decoder
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 * @author Marco Gerards <marco@gnu.org>
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 */
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#include "libavutil/imgutils.h"
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#include "dirac.h"
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#include "avcodec.h"
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#include "golomb.h"
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#include "mpeg12data.h"
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// defaults for source parameters
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static const dirac_source_params dirac_source_parameters_defaults[] = {
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    { 640,  480,  2, 0, 0, 1,  1, 640,  480,  0, 0, 1, 0 },
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    { 176,  120,  2, 0, 0, 9,  2, 176,  120,  0, 0, 1, 1 },
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    { 176,  144,  2, 0, 1, 10, 3, 176,  144,  0, 0, 1, 2 },
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    { 352,  240,  2, 0, 0, 9,  2, 352,  240,  0, 0, 1, 1 },
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    { 352,  288,  2, 0, 1, 10, 3, 352,  288,  0, 0, 1, 2 },
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    { 704,  480,  2, 0, 0, 9,  2, 704,  480,  0, 0, 1, 1 },
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    { 704,  576,  2, 0, 1, 10, 3, 704,  576,  0, 0, 1, 2 },
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    { 720,  480,  1, 1, 0, 4,  2, 704,  480,  8, 0, 3, 1 },
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    { 720,  576,  1, 1, 1, 3,  3, 704,  576,  8, 0, 3, 2 },
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    { 1280, 720,  1, 0, 1, 7,  1, 1280, 720,  0, 0, 3, 3 },
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    { 1280, 720,  1, 0, 1, 6,  1, 1280, 720,  0, 0, 3, 3 },
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    { 1920, 1080, 1, 1, 1, 4,  1, 1920, 1080, 0, 0, 3, 3 },
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    { 1920, 1080, 1, 1, 1, 3,  1, 1920, 1080, 0, 0, 3, 3 },
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    { 1920, 1080, 1, 0, 1, 7,  1, 1920, 1080, 0, 0, 3, 3 },
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    { 1920, 1080, 1, 0, 1, 6,  1, 1920, 1080, 0, 0, 3, 3 },
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    { 2048, 1080, 0, 0, 1, 2,  1, 2048, 1080, 0, 0, 4, 4 },
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    { 4096, 2160, 0, 0, 1, 2,  1, 4096, 2160, 0, 0, 4, 4 },
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    { 3840, 2160, 1, 0, 1, 7,  1, 3840, 2160, 0, 0, 3, 3 },
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    { 3840, 2160, 1, 0, 1, 6,  1, 3840, 2160, 0, 0, 3, 3 },
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    { 7680, 4320, 1, 0, 1, 7,  1, 3840, 2160, 0, 0, 3, 3 },
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    { 7680, 4320, 1, 0, 1, 6,  1, 3840, 2160, 0, 0, 3, 3 },
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};
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static const AVRational dirac_preset_aspect_ratios[] = {
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    {1, 1},
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    {10, 11},
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    {12, 11},
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    {40, 33},
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    {16, 11},
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    {4, 3},
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};
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static const AVRational dirac_frame_rate[] = {
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    {15000, 1001},
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    {25, 2},
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};
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static const struct {
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    uint8_t             bitdepth;
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    enum AVColorRange   color_range;
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} pixel_range_presets[] = {
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    {8,  AVCOL_RANGE_JPEG},
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    {8,  AVCOL_RANGE_MPEG},
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    {10, AVCOL_RANGE_MPEG},
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    {12, AVCOL_RANGE_MPEG},
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};
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static const enum AVColorPrimaries dirac_primaries[] = {
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    AVCOL_PRI_BT709,
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    AVCOL_PRI_SMPTE170M,
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    AVCOL_PRI_BT470BG,
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};
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static const struct {
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    enum AVColorPrimaries color_primaries;
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    enum AVColorSpace colorspace;
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    enum AVColorTransferCharacteristic color_trc;
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} dirac_color_presets[] = {
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    { AVCOL_PRI_BT709,     AVCOL_SPC_BT709,   AVCOL_TRC_BT709 },
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    { AVCOL_PRI_SMPTE170M, AVCOL_SPC_BT470BG, AVCOL_TRC_BT709 },
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    { AVCOL_PRI_BT470BG,   AVCOL_SPC_BT470BG, AVCOL_TRC_BT709 },
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    { AVCOL_PRI_BT709,     AVCOL_SPC_BT709,   AVCOL_TRC_BT709 },
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    { AVCOL_PRI_BT709,     AVCOL_SPC_BT709,   AVCOL_TRC_UNSPECIFIED /* DCinema */ },
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};
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static const enum PixelFormat dirac_pix_fmt[2][3] = {
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    { PIX_FMT_YUV444P,  PIX_FMT_YUV422P,  PIX_FMT_YUV420P  },
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    { PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P, PIX_FMT_YUVJ420P },
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};
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static int parse_source_parameters(AVCodecContext *avctx, GetBitContext *gb,
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                                   dirac_source_params *source)
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{
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    AVRational frame_rate = (AVRational){0,0};
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    unsigned luma_depth = 8, luma_offset = 16;
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    int idx;
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    if (get_bits1(gb)) {
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        source->width  = svq3_get_ue_golomb(gb);
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        source->height = svq3_get_ue_golomb(gb);
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    }
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    // chroma subsampling
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    if (get_bits1(gb))
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        source->chroma_format = svq3_get_ue_golomb(gb);
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    if (source->chroma_format > 2) {
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        av_log(avctx, AV_LOG_ERROR, "Unknown chroma format %d\n",
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               source->chroma_format);
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        return -1;
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    }
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    if (get_bits1(gb))
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        source->interlaced = svq3_get_ue_golomb(gb);
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    if (source->interlaced > 1)
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        return -1;
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    // frame rate
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    if (get_bits1(gb)) {
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        source->frame_rate_index = svq3_get_ue_golomb(gb);
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        if (source->frame_rate_index > 10)
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            return -1;
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        if (!source->frame_rate_index) {
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            frame_rate.num = svq3_get_ue_golomb(gb);
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            frame_rate.den = svq3_get_ue_golomb(gb);
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        }
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    }
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    if (source->frame_rate_index > 0) {
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        if (source->frame_rate_index <= 8)
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            frame_rate = ff_frame_rate_tab[source->frame_rate_index];
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        else
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            frame_rate = dirac_frame_rate[source->frame_rate_index-9];
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    }
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    av_reduce(&avctx->time_base.num, &avctx->time_base.den,
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              frame_rate.den, frame_rate.num, 1<<30);
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    // aspect ratio
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    if (get_bits1(gb)) {
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        source->aspect_ratio_index = svq3_get_ue_golomb(gb);
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        if (source->aspect_ratio_index > 6)
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            return -1;
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        if (!source->aspect_ratio_index) {
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            avctx->sample_aspect_ratio.num = svq3_get_ue_golomb(gb);
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            avctx->sample_aspect_ratio.den = svq3_get_ue_golomb(gb);
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        }
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    }
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    if (source->aspect_ratio_index > 0)
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        avctx->sample_aspect_ratio =
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                dirac_preset_aspect_ratios[source->aspect_ratio_index-1];
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    if (get_bits1(gb)) {
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        source->clean_width        = svq3_get_ue_golomb(gb);
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        source->clean_height       = svq3_get_ue_golomb(gb);
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        source->clean_left_offset  = svq3_get_ue_golomb(gb);
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        source->clean_right_offset = svq3_get_ue_golomb(gb);
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    }
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    // Override signal range.
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    if (get_bits1(gb)) {
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        source->pixel_range_index = svq3_get_ue_golomb(gb);
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        if (source->pixel_range_index > 4)
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            return -1;
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        // This assumes either fullrange or MPEG levels only
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        if (!source->pixel_range_index) {
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            luma_offset = svq3_get_ue_golomb(gb);
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            luma_depth  = av_log2(svq3_get_ue_golomb(gb))+1;
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            svq3_get_ue_golomb(gb); // chroma offset
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            svq3_get_ue_golomb(gb); // chroma excursion
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            avctx->color_range = luma_offset ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
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        }
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    }
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    if (source->pixel_range_index > 0) {
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        idx                = source->pixel_range_index-1;
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        luma_depth         = pixel_range_presets[idx].bitdepth;
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        avctx->color_range = pixel_range_presets[idx].color_range;
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    }
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    if (luma_depth > 8)
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        av_log(avctx, AV_LOG_WARNING, "Bitdepth greater than 8");
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    avctx->pix_fmt = dirac_pix_fmt[!luma_offset][source->chroma_format];
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    // color spec
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    if (get_bits1(gb)) {
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        idx = source->color_spec_index = svq3_get_ue_golomb(gb);
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        if (source->color_spec_index > 4)
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            return -1;
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        avctx->color_primaries = dirac_color_presets[idx].color_primaries;
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        avctx->colorspace      = dirac_color_presets[idx].colorspace;
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        avctx->color_trc       = dirac_color_presets[idx].color_trc;
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        if (!source->color_spec_index) {
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            if (get_bits1(gb)) {
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                idx = svq3_get_ue_golomb(gb);
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                if (idx < 3)
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                    avctx->color_primaries = dirac_primaries[idx];
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            }
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            if (get_bits1(gb)) {
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                idx = svq3_get_ue_golomb(gb);
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                if (!idx)
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                    avctx->colorspace = AVCOL_SPC_BT709;
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                else if (idx == 1)
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                    avctx->colorspace = AVCOL_SPC_BT470BG;
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            }
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            if (get_bits1(gb) && !svq3_get_ue_golomb(gb))
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                avctx->color_trc = AVCOL_TRC_BT709;
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        }
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    } else {
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        idx = source->color_spec_index;
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        avctx->color_primaries = dirac_color_presets[idx].color_primaries;
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        avctx->colorspace      = dirac_color_presets[idx].colorspace;
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        avctx->color_trc       = dirac_color_presets[idx].color_trc;
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    }
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    return 0;
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}
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int ff_dirac_parse_sequence_header(AVCodecContext *avctx, GetBitContext *gb,
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                                   dirac_source_params *source)
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{
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    unsigned version_major, version_minor;
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    unsigned video_format, picture_coding_mode;
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    version_major  = svq3_get_ue_golomb(gb);
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    version_minor  = svq3_get_ue_golomb(gb);
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    avctx->profile = svq3_get_ue_golomb(gb);
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    avctx->level   = svq3_get_ue_golomb(gb);
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    video_format   = svq3_get_ue_golomb(gb);
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    if (version_major < 2)
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        av_log(avctx, AV_LOG_WARNING, "Stream is old and may not work\n");
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    else if (version_major > 2)
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        av_log(avctx, AV_LOG_WARNING, "Stream may have unhandled features\n");
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    if (video_format > 20)
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        return -1;
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    // Fill in defaults for the source parameters.
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    *source = dirac_source_parameters_defaults[video_format];
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    // Override the defaults.
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    if (parse_source_parameters(avctx, gb, source))
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        return -1;
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    if (av_image_check_size(source->width, source->height, 0, avctx))
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        return -1;
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    avcodec_set_dimensions(avctx, source->width, source->height);
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    // currently only used to signal field coding
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    picture_coding_mode = svq3_get_ue_golomb(gb);
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    if (picture_coding_mode != 0) {
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        av_log(avctx, AV_LOG_ERROR, "Unsupported picture coding mode %d",
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               picture_coding_mode);
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        return -1;
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    }
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    return 0;
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}