[FFmpeg-devel] [PATCH v7 14/14] vvcdec: add full vvc decoder

Andreas Rheinhardt andreas.rheinhardt at outlook.com
Sun Dec 10 16:38:15 EET 2023


Nuo Mi:
> vvc decoder plug-in to avcodec.
> split frames into slices/tiles and send them to vvc_thread for further decoding
> reorder and wait for the frame decoding to be done and output the frame
> 
> Features:
>     + Support I, P, B frames
>     + Support 8/10/12 bits, chroma 400, 420, 422, and 444 and range extension
>     + Support VVC new tools like MIP, CCLM, AFFINE, GPM, DMVR, PROF, BDOF, LMCS, ALF
>     + 295 conformace clips passed
>     - Not support RPR, IBC, PALETTE, and other minor features yet
> 
> Performance:
>     C code FPS on i7-12700 (x86):
>         BQTerrace_1920x1080_60_10_420_22_RA.vvc      93.0
>         Chimera_8bit_1080P_1000_frames.vvc          184.3
>         NovosobornayaSquare_1920x1080.bin           191.3
>         RitualDance_1920x1080_60_10_420_32_LD.266   150.7
>         RitualDance_1920x1080_60_10_420_37_RA.266   170.0
>         Tango2_3840x2160_60_10_420_27_LD.266         33.7
> 
>     C code FPS on M1 Mac Pro (ARM):
>         BQTerrace_1920x1080_60_10_420_22_RA.vvc     58.7
>         Chimera_8bit_1080P_1000_frames.vvc          153.3
>         NovosobornayaSquare_1920x1080.bin           150.3
>         RitualDance_1920x1080_60_10_420_32_LD.266   105.0
>         RitualDance_1920x1080_60_10_420_37_RA.266   133.0
>         Tango2_3840x2160_60_10_420_27_LD.266        21.7
> 
>     Asm optimizations still working in progress. please check
>     https://github.com/ffvvc/FFmpeg/wiki#performance-data for the latest
> 
> Contributors(based on code merge order):
>     Nuo Mi <nuomi2021 at gmail.com>
>     Xu Mu <toxumu at outlook.com>
>     frankplow <post at frankplowman.com>
>     Shaun Loo <shaunloo10 at gmail.com>
> ---
>  libavcodec/vvc/vvcdec.c | 1022 +++++++++++++++++++++++++++++++++++++++
>  1 file changed, 1022 insertions(+)
> 
> diff --git a/libavcodec/vvc/vvcdec.c b/libavcodec/vvc/vvcdec.c
> index 4ea20624be..64266d3007 100644
> --- a/libavcodec/vvc/vvcdec.c
> +++ b/libavcodec/vvc/vvcdec.c
> @@ -21,28 +21,1050 @@
>   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
>   */
>  #include "libavcodec/codec_internal.h"
> +#include "libavcodec/decode.h"
>  #include "libavcodec/profiles.h"
> +#include "libavcodec/refstruct.h"
> +#include "libavutil/cpu.h"
> +#include "libavutil/thread.h"
>  
>  #include "vvcdec.h"
> +#include "vvc_ctu.h"
> +#include "vvc_data.h"
> +#include "vvc_refs.h"
> +#include "vvc_thread.h"
> +
> +static int frame_start(VVCContext *s, VVCFrameContext *fc, SliceContext *sc)
> +{
> +    const VVCPH *ph                 = &fc->ps.ph;
> +    const H266RawSliceHeader *rsh   = sc->sh.r;
> +    int ret;
> +
> +    // 8.3.1 Decoding process for picture order count
> +    if (!s->temporal_id && !ph->r->ph_non_ref_pic_flag && !(IS_RASL(s) || IS_RADL(s)))
> +        s->poc_tid0 = ph->poc;
> +
> +    if ((ret = ff_vvc_set_new_ref(s, fc, &fc->frame)) < 0)
> +        goto fail;
> +
> +    if (!IS_IDR(s))
> +        ff_vvc_bump_frame(s, fc);
> +
> +    av_frame_unref(fc->output_frame);
> +
> +    if ((ret = ff_vvc_output_frame(s, fc, fc->output_frame,rsh->sh_no_output_of_prior_pics_flag, 0)) < 0)
> +        goto fail;
> +
> +    if ((ret = ff_vvc_frame_rpl(s, fc, sc)) < 0)
> +        goto fail;
> +
> +    if ((ret = ff_vvc_frame_thread_init(fc)) < 0)
> +        goto fail;
> +    return 0;
> +fail:
> +    if (fc->ref)
> +        ff_vvc_unref_frame(fc, fc->ref, ~0);
> +    fc->ref = NULL;
> +    return ret;
> +}
> +
> +static void ctb_arrays_free(VVCFrameContext *fc)
> +{
> +    av_freep(&fc->tab.deblock);
> +    av_freep(&fc->tab.sao);
> +    av_freep(&fc->tab.alf);
> +    av_freep(&fc->tab.slice_idx);
> +    av_freep(&fc->tab.coeffs);
> +    if (fc->tab.ctus) {
> +        for (int i = 0; i < fc->tab.ctu_count; i++)
> +            ff_vvc_ctu_free_cus(fc->tab.ctus + i);
> +        av_freep(&fc->tab.ctus);
> +    }
> +    ff_refstruct_pool_uninit(&fc->rpl_tab_pool);
> +}
> +
> +static int ctb_arrays_init(VVCFrameContext *fc, const int ctu_count, const int ctu_size)
> +{
> +    if (fc->tab.ctu_count != ctu_count || fc->tab.ctu_size != ctu_size) {
> +        ctb_arrays_free(fc);
> +        fc->tab.deblock         = av_calloc(ctu_count, sizeof(*fc->tab.deblock));
> +        fc->tab.sao             = av_calloc(ctu_count, sizeof(*fc->tab.sao));
> +        fc->tab.alf             = av_calloc(ctu_count, sizeof(*fc->tab.alf));
> +        fc->tab.ctus            = av_calloc(ctu_count, sizeof(*fc->tab.ctus));
> +        fc->tab.slice_idx       = av_malloc(ctu_count * sizeof(*fc->tab.slice_idx));
> +        if (!fc->tab.deblock || !fc->tab.sao || !fc->tab.alf || !fc->tab.ctus || !fc->tab.slice_idx )
> +            return AVERROR(ENOMEM);
> +        fc->tab.coeffs = av_malloc(ctu_count * sizeof(*fc->tab.coeffs) * ctu_size * VVC_MAX_SAMPLE_ARRAYS);
> +        if (!fc->tab.coeffs)
> +            return AVERROR(ENOMEM);
> +        fc->rpl_tab_pool = ff_refstruct_pool_alloc(ctu_count * sizeof(RefPicListTab), 0);
> +        if (!fc->rpl_tab_pool)
> +            return AVERROR(ENOMEM);
> +    } else {
> +        memset(fc->tab.deblock, 0, ctu_count * sizeof(*fc->tab.deblock));
> +        memset(fc->tab.sao, 0, ctu_count * sizeof(*fc->tab.sao));
> +        memset(fc->tab.alf, 0, ctu_count * sizeof(*fc->tab.alf));
> +        for (int i = 0; i < fc->tab.ctu_count; i++)
> +            ff_vvc_ctu_free_cus(fc->tab.ctus + i);
> +        memset(fc->tab.ctus, 0, ctu_count * sizeof(*fc->tab.ctus));
> +    }
> +    memset(fc->tab.slice_idx, -1, ctu_count * sizeof(*fc->tab.slice_idx));
> +
> +    return 0;
> +}
> +
> +static void min_cb_arrays_free(VVCFrameContext *fc)
> +{
> +    for (int i = LUMA; i <= CHROMA; i++) {
> +        av_freep(&fc->tab.cb_pos_x[i]);
> +        av_freep(&fc->tab.cb_pos_y[i]);
> +        av_freep(&fc->tab.cb_width[i]);
> +        av_freep(&fc->tab.cb_height[i]);
> +        av_freep(&fc->tab.cqt_depth[i]);
> +        av_freep(&fc->tab.cpm[i]);
> +        av_freep(&fc->tab.cp_mv[i]);
> +    }
> +
> +    av_freep(&fc->tab.ipm);
> +    av_freep(&fc->tab.imf);
> +    av_freep(&fc->tab.imtf);
> +    av_freep(&fc->tab.imm);
> +    av_freep(&fc->tab.skip);
> +}
> +
> +static int min_cb_arrays_init(VVCFrameContext *fc, const int pic_size_in_min_cb)
> +{
> +    if (fc->tab.pic_size_in_min_cb != pic_size_in_min_cb) {
> +        min_cb_arrays_free(fc);
> +        for (int i = LUMA; i <= CHROMA; i++) {
> +            fc->tab.cb_pos_x[i]  = av_mallocz(pic_size_in_min_cb * sizeof(int));
> +            fc->tab.cb_pos_y[i]  = av_mallocz(pic_size_in_min_cb * sizeof(int));
> +            fc->tab.cb_width[i]  = av_mallocz(pic_size_in_min_cb);
> +            fc->tab.cb_height[i] = av_mallocz(pic_size_in_min_cb);
> +            fc->tab.cqt_depth[i] = av_mallocz(pic_size_in_min_cb);
> +            if (!fc->tab.cb_pos_x[i] || !fc->tab.cb_pos_y[i] || !fc->tab.cb_width[i] || !fc->tab.cb_height[i] || !fc->tab.cqt_depth[i])
> +                return AVERROR(ENOMEM);
> +
> +            fc->tab.cpm[i]   = av_mallocz(pic_size_in_min_cb);
> +            fc->tab.cp_mv[i] = av_mallocz(pic_size_in_min_cb * sizeof(Mv) * MAX_CONTROL_POINTS);
> +            if (!fc->tab.cpm[i] || !fc->tab.cp_mv[i])
> +                return AVERROR(ENOMEM);
> +        }
> +
> +        fc->tab.ipm  = av_mallocz(pic_size_in_min_cb);
> +        fc->tab.imf  = av_mallocz(pic_size_in_min_cb);
> +        fc->tab.imtf = av_mallocz(pic_size_in_min_cb);
> +        fc->tab.imm  = av_mallocz(pic_size_in_min_cb);
> +        fc->tab.skip = av_mallocz(pic_size_in_min_cb);
> +        if (!fc->tab.ipm || !fc->tab.imf || !fc->tab.imtf || !fc->tab.imm || !fc->tab.skip)
> +            return AVERROR(ENOMEM);
> +    } else {
> +        for (int i = LUMA; i <= CHROMA; i++) {
> +            memset(fc->tab.cb_pos_x[i], 0, pic_size_in_min_cb * sizeof(int));
> +            memset(fc->tab.cb_pos_y[i], 0, pic_size_in_min_cb * sizeof(int));
> +            memset(fc->tab.cb_width[i], 0, pic_size_in_min_cb);
> +            memset(fc->tab.cb_height[i], 0, pic_size_in_min_cb);
> +            memset(fc->tab.cqt_depth[i], 0, pic_size_in_min_cb);
> +            memset(fc->tab.cpm[i], 0, pic_size_in_min_cb);
> +            memset(fc->tab.cp_mv[i], 0, pic_size_in_min_cb * sizeof(Mv) * MAX_CONTROL_POINTS);
> +        }
> +
> +        memset(fc->tab.ipm, 0, pic_size_in_min_cb);
> +        memset(fc->tab.imf, 0, pic_size_in_min_cb);
> +        memset(fc->tab.imtf, 0, pic_size_in_min_cb);
> +        memset(fc->tab.imm, 0, pic_size_in_min_cb);
> +        memset(fc->tab.skip, 0, pic_size_in_min_cb);
> +    }
> +    return 0;
> +}
> +
> +static void min_tu_arrays_free(VVCFrameContext *fc)
> +{
> +    for (int i = LUMA; i <= CHROMA; i++) {
> +        av_freep(&fc->tab.tb_pos_x0[i]);
> +        av_freep(&fc->tab.tb_pos_y0[i]);
> +        av_freep(&fc->tab.tb_width[i]);
> +        av_freep(&fc->tab.tb_height[i]);
> +        av_freep(&fc->tab.pcmf[i]);
> +    }
> +
> +    for (int i = 0; i < VVC_MAX_SAMPLE_ARRAYS; i++) {
> +        av_freep(&fc->tab.qp[i]);
> +        av_freep(&fc->tab.tu_coded_flag[i]);
> +    }
> +
> +    av_freep(&fc->tab.tu_joint_cbcr_residual_flag);
> +}
> +
> +static int min_tu_arrays_init(VVCFrameContext *fc, const int pic_size_in_min_tu)
> +{
> +    if (fc->tab.pic_size_in_min_tu != pic_size_in_min_tu) {
> +        min_tu_arrays_free(fc);
> +        for (int i = LUMA; i <= CHROMA; i++) {
> +            fc->tab.tb_pos_x0[i] = av_mallocz(pic_size_in_min_tu * sizeof(*fc->tab.tb_pos_x0[0]));
> +            fc->tab.tb_pos_y0[i] = av_mallocz(pic_size_in_min_tu * sizeof(*fc->tab.tb_pos_y0[0])) ;
> +            fc->tab.tb_width[i]  = av_mallocz(pic_size_in_min_tu);
> +            fc->tab.tb_height[i] = av_mallocz(pic_size_in_min_tu);
> +            fc->tab.pcmf[i]      = av_mallocz(pic_size_in_min_tu);
> +            if (!fc->tab.tb_pos_x0[i] || !fc->tab.tb_pos_y0[i] ||
> +                !fc->tab.tb_width[i] || !fc->tab.tb_height[i] || !fc->tab.pcmf[i])
> +                return AVERROR(ENOMEM);
> +        }
> +
> +        for (int i = 0; i < VVC_MAX_SAMPLE_ARRAYS; i++) {
> +            fc->tab.tu_coded_flag[i] = av_mallocz(pic_size_in_min_tu);
> +            if (!fc->tab.tu_coded_flag[i])
> +                return AVERROR(ENOMEM);
> +
> +            fc->tab.qp[i] = av_mallocz(pic_size_in_min_tu);
> +            if (!fc->tab.qp[i])
> +                return AVERROR(ENOMEM);
> +        }
> +
> +        fc->tab.tu_joint_cbcr_residual_flag  = av_mallocz(pic_size_in_min_tu);
> +        if (!fc->tab.tu_joint_cbcr_residual_flag)
> +            return AVERROR(ENOMEM);
> +    } else {
> +        for (int i = LUMA; i <= CHROMA; i++) {
> +            memset(fc->tab.tb_pos_x0[i], 0, pic_size_in_min_tu * sizeof(*fc->tab.tb_pos_x0[0]));
> +            memset(fc->tab.tb_pos_y0[i], 0, pic_size_in_min_tu * sizeof(*fc->tab.tb_pos_y0[0])) ;
> +            memset(fc->tab.tb_width[i], 0, pic_size_in_min_tu);
> +            memset(fc->tab.tb_height[i], 0, pic_size_in_min_tu);
> +            memset(fc->tab.pcmf[i], 0, pic_size_in_min_tu);
> +        }
> +
> +        for (int i = 0; i < VVC_MAX_SAMPLE_ARRAYS; i++) {
> +            memset(fc->tab.tu_coded_flag[i], 0, pic_size_in_min_tu);
> +            memset(fc->tab.qp[i], 0, pic_size_in_min_tu);
> +        }
> +        memset(fc->tab.tu_joint_cbcr_residual_flag, 0, pic_size_in_min_tu);
> +    }
> +    return 0;
> +}
> +
> +static void min_pu_arrays_free(VVCFrameContext *fc)
> +{
> +    av_freep(&fc->tab.mvf);
> +    av_freep(&fc->tab.msf);
> +    av_freep(&fc->tab.iaf);
> +    av_freep(&fc->tab.mmi);
> +    ff_refstruct_pool_uninit(&fc->tab_dmvr_mvf_pool);
> +}
> +
> +static int min_pu_arrays_init(VVCFrameContext *fc, const int pic_size_in_min_pu)
> +{
> +    if (fc->tab.pic_size_in_min_pu != pic_size_in_min_pu) {
> +        min_pu_arrays_free(fc);
> +        fc->tab.msf  = av_mallocz(pic_size_in_min_pu);
> +        fc->tab.iaf  = av_mallocz(pic_size_in_min_pu);
> +        fc->tab.mmi  = av_mallocz(pic_size_in_min_pu);
> +        fc->tab.mvf  = av_mallocz(pic_size_in_min_pu * sizeof(*fc->tab.mvf));
> +        if (!fc->tab.msf || !fc->tab.iaf || !fc->tab.mmi || !fc->tab.mvf)
> +            return AVERROR(ENOMEM);
> +        fc->tab_dmvr_mvf_pool  = ff_refstruct_pool_alloc(pic_size_in_min_pu * sizeof(MvField), FF_REFSTRUCT_POOL_FLAG_ZERO_EVERY_TIME);
> +        if (!fc->tab_dmvr_mvf_pool)
> +            return AVERROR(ENOMEM);
> +    } else {
> +        memset(fc->tab.msf, 0, pic_size_in_min_pu);
> +        memset(fc->tab.iaf, 0, pic_size_in_min_pu);
> +        memset(fc->tab.mmi, 0, pic_size_in_min_pu);
> +        memset(fc->tab.mvf, 0, pic_size_in_min_pu * sizeof(*fc->tab.mvf));
> +    }
> +
> +    return 0;
> +}
> +
> +static void bs_arrays_free(VVCFrameContext *fc)
> +{
> +    for (int i = 0; i < VVC_MAX_SAMPLE_ARRAYS; i++) {
> +        av_freep(&fc->tab.horizontal_bs[i]);
> +        av_freep(&fc->tab.vertical_bs[i]);
> +    }
> +    av_freep(&fc->tab.horizontal_q);
> +    av_freep(&fc->tab.horizontal_p);
> +    av_freep(&fc->tab.vertical_p);
> +    av_freep(&fc->tab.vertical_q);
> +}
> +
> +static int bs_arrays_init(VVCFrameContext *fc, const int bs_width, const int bs_height)
> +{
> +    if (fc->tab.bs_width != bs_width || fc->tab.bs_height != bs_height) {
> +        bs_arrays_free(fc);
> +        for (int i = 0; i < VVC_MAX_SAMPLE_ARRAYS; i++) {
> +            fc->tab.horizontal_bs[i] = av_calloc(bs_width, bs_height);
> +            fc->tab.vertical_bs[i]   = av_calloc(bs_width, bs_height);
> +            if (!fc->tab.horizontal_bs[i] || !fc->tab.vertical_bs[i])
> +                return AVERROR(ENOMEM);
> +        }
> +        fc->tab.horizontal_q = av_calloc(bs_width, bs_height);
> +        fc->tab.horizontal_p = av_calloc(bs_width, bs_height);
> +        fc->tab.vertical_p   = av_calloc(bs_width, bs_height);
> +        fc->tab.vertical_q   = av_calloc(bs_width, bs_height);
> +        if (!fc->tab.horizontal_q || !fc->tab.horizontal_p || !fc->tab.vertical_p || !fc->tab.vertical_q)
> +            return AVERROR(ENOMEM);
> +    } else {
> +        for (int i = 0; i < VVC_MAX_SAMPLE_ARRAYS; i++) {
> +            memset(fc->tab.horizontal_bs[i], 0, bs_width * bs_height);
> +            memset(fc->tab.vertical_bs[i], 0, bs_width * bs_height);
> +        }
> +        memset(fc->tab.horizontal_q, 0, bs_width * bs_height);
> +        memset(fc->tab.horizontal_p, 0, bs_width * bs_height);
> +        memset(fc->tab.vertical_p, 0, bs_width * bs_height);
> +        memset(fc->tab.vertical_q, 0, bs_width * bs_height);
> +    }
> +    return 0;
> +}
> +
> +static void pixel_buffer_free(VVCFrameContext *fc)
> +{
> +    for (int i = 0; i < VVC_MAX_SAMPLE_ARRAYS; i++) {
> +        av_freep(&fc->tab.sao_pixel_buffer_h[i]);
> +        av_freep(&fc->tab.sao_pixel_buffer_v[i]);
> +        for (int j = 0; j < 2; j++) {
> +            av_freep(&fc->tab.alf_pixel_buffer_h[i][j]);
> +            av_freep(&fc->tab.alf_pixel_buffer_v[i][j]);
> +        }
> +    }
> +}
> +
> +static int pixel_buffer_init(VVCFrameContext *fc, const int width, const int height,
> +    const int ctu_width, const int ctu_height, const int chroma_format_idc, const int ps)
> +{
> +    const VVCSPS *sps = fc->ps.sps;
> +    const int c_end   = chroma_format_idc ? VVC_MAX_SAMPLE_ARRAYS : 1;
> +
> +    if (fc->tab.chroma_format_idc != chroma_format_idc ||
> +        fc->tab.width != width || fc->tab.height != height ||
> +        fc->tab.ctu_width != ctu_width || fc->tab.ctu_height != ctu_height) {
> +        pixel_buffer_free(fc);
> +        for (int c_idx = 0; c_idx < c_end; c_idx++) {
> +            const int w = width >> sps->hshift[c_idx];
> +            const int h = height >> sps->vshift[c_idx];
> +            fc->tab.sao_pixel_buffer_h[c_idx] = av_malloc((w * 2 * ctu_height) << ps);
> +            fc->tab.sao_pixel_buffer_v[c_idx] = av_malloc((h * 2 * ctu_width)  << ps);
> +            if (!fc->tab.sao_pixel_buffer_h[c_idx] || !fc->tab.sao_pixel_buffer_v[c_idx])
> +                return AVERROR(ENOMEM);
> +        }
> +
> +        for (int c_idx = 0; c_idx < c_end; c_idx++) {
> +            const int w = width >> sps->hshift[c_idx];
> +            const int h = height >> sps->vshift[c_idx];
> +            const int border_pixels = c_idx ? ALF_BORDER_CHROMA : ALF_BORDER_LUMA;
> +            for (int i = 0; i < 2; i++) {
> +                fc->tab.alf_pixel_buffer_h[c_idx][i] = av_malloc((w * border_pixels * ctu_height) << ps);
> +                fc->tab.alf_pixel_buffer_v[c_idx][i] = av_malloc(h * ALF_PADDING_SIZE * ctu_width);
> +                if (!fc->tab.alf_pixel_buffer_h[c_idx][i] || !fc->tab.alf_pixel_buffer_v[c_idx][i])
> +                    return AVERROR(ENOMEM);
> +            }
> +        }
> +    }
> +    return 0;
> +}
> +
> +static void pic_arrays_free(VVCFrameContext *fc)
> +{
> +    ctb_arrays_free(fc);
> +    min_cb_arrays_free(fc);
> +    min_pu_arrays_free(fc);
> +    min_tu_arrays_free(fc);
> +    bs_arrays_free(fc);
> +    pixel_buffer_free(fc);
> +
> +    for (int i = 0; i < 2; i++)
> +        av_freep(&fc->tab.msm[i]);
> +    av_freep(&fc->tab.ispmf);
> +
> +    fc->tab.ctu_count = 0;
> +    fc->tab.ctu_size  = 0;
> +    fc->tab.pic_size_in_min_cb = 0;
> +    fc->tab.pic_size_in_min_pu = 0;
> +    fc->tab.pic_size_in_min_tu = 0;
> +    fc->tab.width              = 0;
> +    fc->tab.height             = 0;
> +    fc->tab.ctu_width          = 0;
> +    fc->tab.ctu_height         = 0;
> +    fc->tab.bs_width           = 0;
> +    fc->tab.bs_height          = 0;
> +}
> +
> +static int pic_arrays_init(VVCContext *s, VVCFrameContext *fc)
> +{
> +    const VVCSPS *sps               = fc->ps.sps;
> +    const VVCPPS *pps               = fc->ps.pps;
> +    const int ctu_size              = 1 << sps->ctb_log2_size_y << sps->ctb_log2_size_y;
> +    const int pic_size_in_min_cb    = pps->min_cb_width * pps->min_cb_height;
> +    const int pic_size_in_min_pu    = pps->min_pu_width * pps->min_pu_height;
> +    const int pic_size_in_min_tu    = pps->min_tu_width * pps->min_tu_height;
> +    const int w32                   = AV_CEIL_RSHIFT(pps->width,  5);
> +    const int h32                   = AV_CEIL_RSHIFT(pps->height,  5);
> +    const int w64                   = AV_CEIL_RSHIFT(pps->width,  6);
> +    const int h64                   = AV_CEIL_RSHIFT(pps->height,  6);
> +    const int bs_width              = (fc->ps.pps->width >> 2) + 1;
> +    const int bs_height             = (fc->ps.pps->height >> 2) + 1;
> +    int ret;
> +
> +    if ((ret = ctb_arrays_init(fc, pps->ctb_count, ctu_size)) < 0)
> +        goto fail;
> +
> +    if ((ret = min_cb_arrays_init(fc, pic_size_in_min_cb)) < 0)
> +        goto fail;
> +
> +    if ((ret = min_pu_arrays_init(fc, pic_size_in_min_pu)) < 0)
> +        goto fail;
> +
> +    if ((ret = min_tu_arrays_init(fc, pic_size_in_min_tu)) < 0)
> +        goto fail;
> +
> +    if ((ret = bs_arrays_init(fc, bs_width, bs_height)) < 0)
> +        goto fail;
> +
> +    if ((ret = pixel_buffer_init(fc, pps->width, pps->height, pps->ctb_width, pps->ctb_height,
> +        sps->r->sps_chroma_format_idc, sps->pixel_shift)) < 0)
> +        goto fail;
> +
> +    if (AV_CEIL_RSHIFT(fc->tab.width,  5) != w32 || AV_CEIL_RSHIFT(fc->tab.height,  5) != h32) {
> +        for (int i = LUMA; i <= CHROMA; i++) {
> +            av_freep(&fc->tab.msm[i]);
> +            fc->tab.msm[i] = av_calloc(w32, h32);
> +            if (!fc->tab.msm[i])
> +                goto fail;
> +        }
> +    } else {
> +        for (int i = LUMA; i <= CHROMA; i++)
> +            memset(fc->tab.msm[i], 0, w32 * h32);
> +    }
> +    if (AV_CEIL_RSHIFT(fc->tab.width,  6) != w64 || AV_CEIL_RSHIFT(fc->tab.height,  6) != h64) {
> +        av_freep(&fc->tab.ispmf);
> +        fc->tab.ispmf = av_calloc(w64, h64);
> +        if (!fc->tab.ispmf)
> +            goto fail;
> +    } else {
> +        memset(fc->tab.ispmf, 0, w64 * h64);
> +    }
> +
> +    fc->tab.ctu_count = pps->ctb_count;
> +    fc->tab.ctu_size  = ctu_size;
> +    fc->tab.pic_size_in_min_cb = pic_size_in_min_cb;
> +    fc->tab.pic_size_in_min_pu = pic_size_in_min_pu;
> +    fc->tab.pic_size_in_min_tu = pic_size_in_min_tu;
> +    fc->tab.width              = pps->width;
> +    fc->tab.height             = pps->height;
> +    fc->tab.ctu_width          = pps->ctb_width;
> +    fc->tab.ctu_height         = pps->ctb_height;
> +    fc->tab.chroma_format_idc  = sps->r->sps_chroma_format_idc;
> +    fc->tab.pixel_shift        = sps->pixel_shift;
> +    fc->tab.bs_width           = bs_width;
> +    fc->tab.bs_height          = bs_height;
> +
> +    return 0;
> +fail:
> +    pic_arrays_free(fc);
> +    return ret;
> +}
> +
> +static int min_positive(const int idx, const int diff, const int min_diff)
> +{
> +    return diff > 0 && (idx < 0 || diff < min_diff);
> +}
> +
> +static int max_negtive(const int idx, const int diff, const int max_diff)
> +{
> +    return diff < 0 && (idx < 0 || diff > max_diff);
> +}
> +
> +typedef int (*smvd_find_fxn)(const int idx, const int diff, const int old_diff);
> +
> +static int8_t smvd_find(const VVCFrameContext *fc, const SliceContext *sc, int lx, smvd_find_fxn find)
> +{
> +    const H266RawSliceHeader *rsh   = sc->sh.r;
> +    const RefPicList *rpl           = sc->rpl + lx;
> +    const int poc                   = fc->ref->poc;
> +    int8_t idx                      = -1;
> +    int old_diff                    = -1;
> +    for (int i = 0; i < rsh->num_ref_idx_active[lx]; i++) {
> +        if (!rpl->isLongTerm[i]) {
> +            int diff = poc - rpl->list[i];
> +            if (find(idx, diff, old_diff)) {
> +                idx = i;
> +                old_diff = diff;
> +            }
> +        }
> +    }
> +    return idx;
> +}
> +
> +static void smvd_ref_idx(const VVCFrameContext *fc, SliceContext *sc)
> +{
> +    VVCSH *sh = &sc->sh;
> +    if (IS_B(sh->r)) {
> +        sh->ref_idx_sym[0] = smvd_find(fc, sc, 0, min_positive);
> +        sh->ref_idx_sym[1] = smvd_find(fc, sc, 1, max_negtive);
> +        if (sh->ref_idx_sym[0] == -1 || sh->ref_idx_sym[1] == -1) {
> +            sh->ref_idx_sym[0] = smvd_find(fc, sc, 0, max_negtive);
> +            sh->ref_idx_sym[1] = smvd_find(fc, sc, 1, min_positive);
> +        }
> +    }
> +}
> +
> +static void eps_free(SliceContext *slice)
> +{
> +    av_freep(&slice->eps);
> +    slice->nb_eps = 0;
> +}
> +
> +static void slices_free(VVCFrameContext *fc)
> +{
> +    if (fc->slices) {
> +        for (int i = 0; i < fc->nb_slices_allocated; i++) {
> +            SliceContext *slice = fc->slices[i];
> +            if (slice) {
> +                ff_refstruct_unref(&slice->sh.r);
> +                eps_free(slice);
> +                av_free(slice);
> +            }
> +        }
> +        av_freep(&fc->slices);
> +    }
> +    fc->nb_slices_allocated = 0;
> +    fc->nb_slices = 0;
> +}
> +
> +static int slices_realloc(VVCFrameContext *fc)
> +{
> +    void *p;
> +    const int size = (fc->nb_slices_allocated + 1) * 3 / 2;
> +
> +    if (fc->nb_slices < fc->nb_slices_allocated)
> +        return 0;
> +
> +    p = av_realloc_array(fc->slices, size, sizeof(*fc->slices));
> +    if (!p)
> +        return AVERROR(ENOMEM);
> +
> +    fc->slices = p;
> +    for (int i = fc->nb_slices_allocated; i < size; i++) {
> +        fc->slices[i] = av_mallocz(sizeof(*fc->slices[0]));
> +        if (!fc->slices[i]) {
> +            fc->nb_slices_allocated = i;
> +            return AVERROR(ENOMEM);
> +        }
> +        fc->slices[i]->slice_idx = i;
> +    }
> +    fc->nb_slices_allocated = size;
> +
> +    return 0;
> +}
> +
> +static void ep_init_cabac_decoder(SliceContext *sc, const int index, const H2645NAL *nal, GetBitContext *gb)
> +{
> +    const H266RawSliceHeader *rsh   = sc->sh.r;
> +    EntryPoint *ep                  = sc->eps + index;
> +    int size;
> +
> +    if (index < rsh->num_entry_points) {
> +        int skipped = 0;
> +        int64_t start =  (gb->index >> 3);
> +        int64_t end = start + rsh->sh_entry_point_offset_minus1[index] + 1;
> +        while (skipped < nal->skipped_bytes && nal->skipped_bytes_pos[skipped] <= start) {
> +            skipped++;
> +        }
> +        while (skipped < nal->skipped_bytes && nal->skipped_bytes_pos[skipped] < end) {
> +            end--;
> +            skipped++;
> +        }
> +        size = end - start;
> +    } else {
> +        size = get_bits_left(gb) / 8;
> +    }
> +    ff_init_cabac_decoder (&ep->cc, gb->buffer + get_bits_count(gb) / 8, size);
> +    skip_bits(gb, size * 8);
> +}
> +
> +static int init_slice_entry_points(SliceContext *sc, VVCFrameContext *fc, const H2645NAL *nal, const CodedBitstreamUnit *unit)
> +{
> +    const VVCSH *sh             = &sc->sh;
> +    const H266RawSlice *slice   = unit->content;
> +    int nb_eps                  = sh->r->num_entry_points + 1;
> +    int ctu_addr                = 0;
> +    GetBitContext gb;
> +
> +    if (sc->nb_eps != nb_eps) {
> +        eps_free(sc);
> +        sc->eps = av_calloc(nb_eps, sizeof(*sc->eps));
> +        if (!sc->eps)
> +            return AVERROR(ENOMEM);
> +        sc->nb_eps = nb_eps;
> +    }
> +
> +    init_get_bits8(&gb, slice->data, slice->data_size);
> +    for (int i = 0; i < sc->nb_eps; i++)
> +    {
> +        EntryPoint *ep = sc->eps + i;
> +
> +        ep->ctu_start = ctu_addr;
> +        ep->ctu_end   = (i + 1 == sc->nb_eps ? sh->num_ctus_in_curr_slice : sh->entry_point_start_ctu[i]);
> +
> +        for (int j = ep->ctu_start; j < ep->ctu_end; j++) {
> +            const int rs = sc->sh.ctb_addr_in_curr_slice[j];
> +            fc->tab.slice_idx[rs] = sc->slice_idx;
> +        }
> +
> +        ep_init_cabac_decoder(sc, i, nal, &gb);
> +
> +        if (i + 1 < sc->nb_eps)
> +            ctu_addr = sh->entry_point_start_ctu[i];
> +    }
> +
> +    return 0;
> +}
> +
> +static VVCFrameContext* get_frame_context(const VVCContext *s, const VVCFrameContext *fc, const int delta)
> +{
> +    const int size = s->nb_fcs;
> +    const int idx = (fc - s->fcs + delta  + size) % size;
> +    return s->fcs + idx;
> +}
> +
> +static int ref_frame(VVCFrame *dst, const VVCFrame *src)
> +{
> +    int ret;
> +
> +    ret = av_frame_ref(dst->frame, src->frame);
> +    if (ret < 0)
> +        return ret;
> +
> +    ff_refstruct_replace(&dst->progress, src->progress);
> +
> +    ff_refstruct_replace(&dst->tab_dmvr_mvf, src->tab_dmvr_mvf);
> +
> +    ff_refstruct_replace(&dst->rpl_tab, src->rpl_tab);
> +    ff_refstruct_replace(&dst->rpl, src->rpl);
> +    dst->nb_rpl_elems = src->nb_rpl_elems;
> +
> +    dst->poc = src->poc;
> +    dst->ctb_count = src->ctb_count;
> +    dst->flags = src->flags;
> +    dst->sequence = src->sequence;
> +
> +    return 0;
> +}
> +
> +static av_cold void frame_context_free(VVCFrameContext *fc)
> +{
> +    slices_free(fc);
> +
> +    ff_refstruct_pool_uninit(&fc->tu_pool);
> +    ff_refstruct_pool_uninit(&fc->cu_pool);
> +
> +    for (int i = 0; i < FF_ARRAY_ELEMS(fc->DPB); i++) {
> +        ff_vvc_unref_frame(fc, &fc->DPB[i], ~0);
> +        av_frame_free(&fc->DPB[i].frame);
> +    }
> +
> +    ff_vvc_frame_thread_free(fc);
> +    pic_arrays_free(fc);
> +    av_frame_free(&fc->output_frame);
> +    ff_vvc_frame_ps_free(&fc->ps);
> +    av_freep(&fc->avctx);
> +}
> +
> +static av_cold int frame_context_init(VVCFrameContext *fc, AVCodecContext *avctx)
> +{
> +
> +    fc->avctx = av_memdup(avctx, sizeof(*avctx));
> +    if (!fc->avctx)
> +        goto fail;

You said that you wanted to remove the memdup, but you didn't.

> +
> +    fc->output_frame = av_frame_alloc();
> +    if (!fc->output_frame)
> +        goto fail;
> +
> +    for (int j = 0; j < FF_ARRAY_ELEMS(fc->DPB); j++) {
> +        fc->DPB[j].frame = av_frame_alloc();
> +        if (!fc->DPB[j].frame)
> +            goto fail;
> +    }
> +    fc->cu_pool = ff_refstruct_pool_alloc(sizeof(CodingUnit), 0);
> +    if (!fc->cu_pool)
> +        goto fail;
> +
> +    fc->tu_pool = ff_refstruct_pool_alloc(sizeof(TransformUnit), 0);
> +    if (!fc->tu_pool)
> +        goto fail;
> +
> +    return 0;
> +fail:
> +    return AVERROR(ENOMEM);
> +}
> +
> +static int frame_context_setup(VVCFrameContext *fc, VVCContext *s)
> +{
> +    int ret = 0;
> +
> +    // copy refs from the last frame
> +    if (s->nb_frames && s->nb_fcs > 1) {
> +        VVCFrameContext *prev = get_frame_context(s, fc, -1);
> +        for (int i = 0; i < FF_ARRAY_ELEMS(fc->DPB); i++) {
> +            ff_vvc_unref_frame(fc, &fc->DPB[i], ~0);
> +            if (prev->DPB[i].frame->buf[0]) {
> +                ret = ref_frame(&fc->DPB[i], &prev->DPB[i]);
> +                if (ret < 0)
> +                    goto fail;
> +            }
> +        }
> +    }
> +
> +    if (IS_IDR(s)) {
> +        s->seq_decode = (s->seq_decode + 1) & 0xff;
> +        ff_vvc_clear_refs(fc);
> +    }
> +
> +    ret = pic_arrays_init(s, fc);
> +    if (ret < 0)
> +        goto fail;
> +    ff_vvc_dsp_init(&fc->vvcdsp, fc->ps.sps->bit_depth);
> +    ff_videodsp_init(&fc->vdsp, fc->ps.sps->bit_depth);
> +
> +fail:
> +    return ret;
> +}
> +
> +static void export_frame_params(VVCFrameContext *fc)
> +{
> +    AVCodecContext *c   = fc->avctx;
> +    const VVCSPS *sps   = fc->ps.sps;
> +    const VVCPPS *pps   = fc->ps.pps;
> +
> +    c->pix_fmt          = sps->pix_fmt;
> +    c->coded_width      = pps->width;
> +    c->coded_height     = pps->height;
> +    c->width            = pps->width  - pps->r->pps_conf_win_left_offset - pps->r->pps_conf_win_right_offset;
> +    c->height           = pps->height - pps->r->pps_conf_win_top_offset - pps->r->pps_conf_win_bottom_offset;
> +}
> +
> +static int frame_setup(VVCFrameContext *fc, VVCContext *s)
> +{
> +    int ret = ff_vvc_decode_frame_ps(&fc->ps, s);
> +    if (ret < 0)
> +        return ret;
> +
> +    ret = frame_context_setup(fc, s);
> +    if (ret < 0)
> +        return ret;
> +
> +    export_frame_params(fc);
> +    return ret;
> +}
> +
> +static int slice_start(VVCContext *s, VVCFrameContext *fc, SliceContext *sc, const CodedBitstreamUnit *unit, const int is_first_slice)
> +{
> +    VVCSH *sh = &sc->sh;
> +    int ret;
> +
> +    ret = ff_vvc_decode_sh(sh, &fc->ps, unit);
> +    if (ret < 0)
> +        return ret;
> +
> +    if (is_first_slice) {
> +        ret = frame_start(s, fc, sc);
> +        if (ret < 0)
> +            return ret;
> +    } else if (fc->ref) {
> +        if (!IS_I(sh->r)) {
> +            ret = ff_vvc_slice_rpl(s, fc, sc);
> +            if (ret < 0) {
> +                av_log(fc->avctx, AV_LOG_WARNING,
> +                       "Error constructing the reference lists for the current slice.\n");
> +                return ret;
> +            }
> +        }
> +    } else {
> +        av_log(fc->avctx, AV_LOG_ERROR, "First slice in a frame missing.\n");
> +        return ret;
> +    }
> +
> +    if (!IS_I(sh->r))
> +        smvd_ref_idx(fc, sc);
> +
> +    return 0;
> +}
> +
> +static int decode_slice(VVCContext *s, VVCFrameContext *fc, const H2645NAL *nal, const CodedBitstreamUnit *unit)
> +{
> +    int ret = 0;
> +    SliceContext *sc;
> +    const int is_first_slice = !fc->nb_slices;
> +
> +    ret = slices_realloc(fc);
> +    if (ret < 0)
> +        return ret;
> +
> +    sc = fc->slices[fc->nb_slices];
> +
> +    s->vcl_unit_type = nal->type;
> +    if (is_first_slice) {
> +        ret = frame_setup(fc, s);
> +        if (ret < 0)
> +            goto fail;
> +    }
> +
> +    ret = slice_start(s, fc, sc, unit, is_first_slice);
> +    if (ret < 0)
> +        goto fail;
> +
> +    ret = init_slice_entry_points(sc, fc, nal, unit);
> +    if (ret < 0)
> +        goto fail;
> +    fc->nb_slices++;
> +
> +fail:
> +    return ret;
> +}
> +
> +static int decode_nal_unit(VVCContext *s, VVCFrameContext *fc, const H2645NAL *nal, const CodedBitstreamUnit *unit)
> +{
> +    int  ret;
> +
> +    s->temporal_id   = nal->temporal_id;
> +
> +    switch (unit->type) {
> +    case VVC_VPS_NUT:
> +    case VVC_SPS_NUT:
> +    case VVC_PPS_NUT:
> +        /* vps, sps, sps cached by s->cbc */
> +        break;
> +    case VVC_TRAIL_NUT:
> +    case VVC_STSA_NUT:
> +    case VVC_RADL_NUT:
> +    case VVC_RASL_NUT:
> +    case VVC_IDR_W_RADL:
> +    case VVC_IDR_N_LP:
> +    case VVC_CRA_NUT:
> +    case VVC_GDR_NUT:
> +        ret = decode_slice(s, fc, nal, unit);
> +        if (ret < 0)
> +            goto fail;
> +        break;
> +    case VVC_PREFIX_APS_NUT:
> +    case VVC_SUFFIX_APS_NUT:
> +        ret = ff_vvc_decode_aps(&s->ps, unit);
> +        if (ret < 0)
> +            goto fail;
> +        break;
> +    default:
> +        av_log(s->avctx, AV_LOG_INFO,
> +               "Skipping NAL unit %d\n", unit->type);
> +    }
> +
> +    return 0;
> +fail:
> +    return ret;
> +}
> +
> +static int decode_nal_units(VVCContext *s, VVCFrameContext *fc, AVPacket *avpkt)
> +{
> +    const CodedBitstreamH266Context *h266   = s->cbc->priv_data;
> +    CodedBitstreamFragment *frame           = &s->current_frame;
> +    int ret = 0;
> +    int eos_at_start = 1;
> +    s->last_eos = s->eos;
> +    s->eos = 0;
> +
> +    ff_cbs_fragment_reset(frame);
> +    ret = ff_cbs_read_packet(s->cbc, frame, avpkt);
> +    if (ret < 0) {
> +        av_log(s->avctx, AV_LOG_ERROR, "Failed to read packet.\n");
> +        return ret;
> +    }
> +    /* decode the NAL units */
> +    for (int i = 0; i < frame->nb_units; i++) {
> +        const H2645NAL *nal             = h266->common.read_packet.nals + i;
> +        const CodedBitstreamUnit *unit  = frame->units + i;
> +
> +        if (unit->type == VVC_EOB_NUT || unit->type == VVC_EOS_NUT) {
> +            if (eos_at_start)
> +                s->last_eos = 1;
> +            else
> +                s->eos = 1;
> +        } else {
> +            ret = decode_nal_unit(s, fc, nal, unit);
> +            if (ret < 0) {
> +                av_log(s->avctx, AV_LOG_WARNING,
> +                        "Error parsing NAL unit #%d.\n", i);
> +                goto fail;
> +            }
> +        }
> +    }
> +    return 0;
> +
> +fail:
> +    if (fc->ref)
> +        ff_vvc_report_frame_finished(fc->ref);
> +    return ret;
> +}
> +
> +static int set_output_format(const VVCContext *s, const AVFrame *output)
> +{
> +    AVCodecContext *c = s->avctx;
> +    int ret;
> +
> +    if (output->width != c->width || output->height != c->height) {
> +        if ((ret = ff_set_dimensions(c, output->width, output->height)) < 0)
> +            return ret;
> +    }
> +    c->pix_fmt = output->format;
> +    return 0;
> +}
> +
> +static int wait_delayed_frame(VVCContext *s, AVFrame *output, int *got_output)
> +{
> +    VVCFrameContext *delayed = get_frame_context(s, s->fcs, s->nb_frames - s->nb_delayed);
> +    int ret = ff_vvc_frame_wait(s, delayed);
> +
> +    if (!ret && delayed->output_frame->buf[0] && output) {
> +        av_frame_move_ref(output, delayed->output_frame);
> +        ret = set_output_format(s, output);
> +        if (!ret)
> +            *got_output = 1;
> +    }
> +    s->nb_delayed--;
> +
> +    return ret;
> +}
> +
> +static int submit_frame(VVCContext *s, VVCFrameContext *fc, AVFrame *output, int *got_output)
> +{
> +    int ret;
> +    s->nb_frames++;
> +    s->nb_delayed++;
> +    ff_vvc_frame_submit(s, fc);
> +    if (s->nb_delayed >= s->nb_fcs) {
> +        if ((ret = wait_delayed_frame(s, output, got_output)) < 0)
> +            return ret;
> +    }
> +    return 0;
> +}
> +
> +static int get_decoded_frame(VVCContext *s, AVFrame *output, int *got_output)
> +{
> +    int ret;
> +    while (s->nb_delayed) {
> +        if ((ret = wait_delayed_frame(s, output, got_output)) < 0)
> +            return ret;
> +        if (*got_output)
> +            return 0;
> +    }
> +    if (s->nb_frames) {
> +        //we still have frames cached in dpb.
> +        VVCFrameContext *last = get_frame_context(s, s->fcs, s->nb_frames - 1);
> +
> +        ret = ff_vvc_output_frame(s, last, output, 0, 1);
> +        if (ret < 0)
> +            return ret;
> +        if (ret) {
> +            *got_output = ret;
> +            if ((ret = set_output_format(s, output)) < 0)
> +                return ret;
> +        }
> +    }
> +    return 0;
> +}
>  
>  static int vvc_decode_frame(AVCodecContext *avctx, AVFrame *output,
>      int *got_output, AVPacket *avpkt)
>  {
> +    VVCContext *s = avctx->priv_data;
> +    VVCFrameContext *fc;
> +    int ret;
> +
> +    if (!avpkt->size)
> +        return get_decoded_frame(s, output, got_output);
> +
> +    fc = get_frame_context(s, s->fcs, s->nb_frames);
> +
> +    fc->nb_slices = 0;
> +    fc->decode_order = s->nb_frames;
> +
> +    ret = decode_nal_units(s, fc, avpkt);
> +    if (ret < 0)
> +        return ret;
> +
> +    ret = submit_frame(s, fc, output, got_output);
> +    if (ret < 0)
> +        return ret;
> +
>      return avpkt->size;
>  }
>  
>  static av_cold void vvc_decode_flush(AVCodecContext *avctx)
>  {
> +    VVCContext *s = avctx->priv_data;
> +    int got_output = 0;
> +
> +    while (s->nb_delayed)
> +        wait_delayed_frame(s, NULL, &got_output);
>  }
>  
>  static av_cold int vvc_decode_free(AVCodecContext *avctx)
>  {
> +    VVCContext *s = avctx->priv_data;
> +
> +    ff_cbs_fragment_free(&s->current_frame);
> +    vvc_decode_flush(avctx);
> +    ff_vvc_executor_free(&s->executor);
> +    if (s->fcs) {
> +        for (int i = 0; i < s->nb_fcs; i++)
> +            frame_context_free(s->fcs + i);
> +        av_free(s->fcs);
> +    }
> +    ff_vvc_ps_uninit(&s->ps);
> +    ff_cbs_close(&s->cbc);
> +
>      return 0;
>  }
>  
> +static av_cold void init_default_scale_m(void)
> +{
> +    memset(&ff_vvc_default_scale_m, 16, sizeof(ff_vvc_default_scale_m));
> +}
> +
> +#define VVC_MAX_DELAYED_FRAMES 16
>  static av_cold int vvc_decode_init(AVCodecContext *avctx)
>  {
> +    VVCContext *s = avctx->priv_data;
> +    static AVOnce init_static_once = AV_ONCE_INIT;
> +    const int cpu_count = av_cpu_count();
> +    int ret;
> +
> +    s->avctx = avctx;
> +
> +    ret = ff_cbs_init(&s->cbc, AV_CODEC_ID_VVC, avctx);
> +    if (ret)
> +        return ret;
> +
> +    s->nb_fcs = (avctx->flags & AV_CODEC_FLAG_LOW_DELAY) ? 1 : VVC_MAX_DELAYED_FRAMES;
> +    s->fcs = av_calloc(s->nb_fcs, sizeof(*s->fcs));
> +    if (!s->fcs)
> +        goto fail;
> +
> +    for (int i = 0; i < s->nb_fcs; i++) {
> +        VVCFrameContext *fc = s->fcs + i;
> +        ret = frame_context_init(fc, avctx);
> +        if (ret < 0)
> +            goto fail;
> +    }
> +
> +    s->executor = ff_vvc_executor_alloc(s, FFMIN(cpu_count, VVC_MAX_DELAYED_FRAMES));

You are still ignoring the user-provided thread-count, although you said
that you have fixed this.

> +    if (!s->executor)
> +        goto fail;
> +
> +    s->eos = 1;
> +    GDR_SET_RECOVERED(s);
> +    ff_thread_once(&init_static_once, init_default_scale_m);
> +
>      return 0;
> +
> +fail:
> +    return AVERROR(ENOMEM);
>  }
>  
>  const FFCodec ff_vvc_decoder = {



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