libavcodec/libdav1d.c - manifest_repos/ffmpeg - Git at Google


            
            /*

            
             * Copyright (c) 2018 Ronald S. Bultje <rsbultje gmail com>

            
             * Copyright (c) 2018 James Almer <jamrial gmail com>

            
             *

            
             * 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 <dav1d/dav1d.h>


            #include "libavutil/avassert.h"

            
            #include "libavutil/film_grain_params.h"

            
            #include "libavutil/mastering_display_metadata.h"

            
            #include "libavutil/imgutils.h"

            
            #include "libavutil/opt.h"


            #include "atsc_a53.h"

            
            #include "avcodec.h"

            
            #include "bytestream.h"

            
            #include "decode.h"

            
            #include "internal.h"


            typedef struct Libdav1dContext {

            
                AVClass *class;

            
                Dav1dContext *c;

            
                AVBufferPool *pool;

            
                int pool_size;


                Dav1dData data;

            
                int tile_threads;

            
                int frame_threads;

            
                int apply_grain;

            
                int operating_point;

            
                int all_layers;

            
            } Libdav1dContext;


            static const enum AVPixelFormat pix_fmt[][3] = {

            
                [DAV1D_PIXEL_LAYOUT_I400] = { AV_PIX_FMT_GRAY8,   AV_PIX_FMT_GRAY10,    AV_PIX_FMT_GRAY12 },

            
                [DAV1D_PIXEL_LAYOUT_I420] = { AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV420P12 },

            
                [DAV1D_PIXEL_LAYOUT_I422] = { AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV422P12 },

            
                [DAV1D_PIXEL_LAYOUT_I444] = { AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV444P10, AV_PIX_FMT_YUV444P12 },

            
            };


            static const enum AVPixelFormat pix_fmt_rgb[3] = {

            
                AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRP10, AV_PIX_FMT_GBRP12,

            
            };


            static void libdav1d_log_callback(void *opaque, const char *fmt, va_list vl)

            
            {

            
                AVCodecContext *c = opaque;


                av_vlog(c, AV_LOG_ERROR, fmt, vl);

            
            }


            static int libdav1d_picture_allocator(Dav1dPicture *p, void *cookie)

            
            {

            
                Libdav1dContext *dav1d = cookie;

            
                enum AVPixelFormat format = pix_fmt[p->p.layout][p->seq_hdr->hbd];

            
                int ret, linesize[4], h = FFALIGN(p->p.h, 128), w = FFALIGN(p->p.w, 128);

            
                uint8_t *aligned_ptr, *data[4];

            
                AVBufferRef *buf;


                ret = av_image_get_buffer_size(format, w, h, DAV1D_PICTURE_ALIGNMENT);

            
                if (ret < 0)

            
                    return ret;


                if (ret != dav1d->pool_size) {

            
                    av_buffer_pool_uninit(&dav1d->pool);

            
                    // Use twice the amount of required padding bytes for aligned_ptr below.

            
                    dav1d->pool = av_buffer_pool_init(ret + DAV1D_PICTURE_ALIGNMENT * 2, NULL);

            
                    if (!dav1d->pool) {

            
                        dav1d->pool_size = 0;

            
                        return AVERROR(ENOMEM);

            
                    }

            
                    dav1d->pool_size = ret;

            
                }

            
                buf = av_buffer_pool_get(dav1d->pool);

            
                if (!buf)

            
                    return AVERROR(ENOMEM);


                // libdav1d requires DAV1D_PICTURE_ALIGNMENT aligned buffers, which av_malloc()

            
                // doesn't guarantee for example when AVX is disabled at configure time.

            
                // Use the extra DAV1D_PICTURE_ALIGNMENT padding bytes in the buffer to align it

            
                // if required.

            
                aligned_ptr = (uint8_t *)FFALIGN((uintptr_t)buf->data, DAV1D_PICTURE_ALIGNMENT);

            
                ret = av_image_fill_arrays(data, linesize, aligned_ptr, format, w, h,

            
                                           DAV1D_PICTURE_ALIGNMENT);

            
                if (ret < 0) {

            
                    av_buffer_unref(&buf);

            
                    return ret;

            
                }


                p->data[0] = data[0];

            
                p->data[1] = data[1];

            
                p->data[2] = data[2];

            
                p->stride[0] = linesize[0];

            
                p->stride[1] = linesize[1];

            
                p->allocator_data = buf;


                return 0;

            
            }


            static void libdav1d_picture_release(Dav1dPicture *p, void *cookie)

            
            {

            
                AVBufferRef *buf = p->allocator_data;


                av_buffer_unref(&buf);

            
            }


            static av_cold int libdav1d_init(AVCodecContext *c)

            
            {

            
                Libdav1dContext *dav1d = c->priv_data;

            
                Dav1dSettings s;

            
                int threads = (c->thread_count ? c->thread_count : av_cpu_count()) * 3 / 2;

            
                int res;


                av_log(c, AV_LOG_INFO, "libdav1d %s\n", dav1d_version());


                dav1d_default_settings(&s);

            
                s.logger.cookie = c;

            
                s.logger.callback = libdav1d_log_callback;

            
                s.allocator.cookie = dav1d;

            
                s.allocator.alloc_picture_callback = libdav1d_picture_allocator;

            
                s.allocator.release_picture_callback = libdav1d_picture_release;

            
                s.frame_size_limit = c->max_pixels;

            
                if (dav1d->apply_grain >= 0)

            
                    s.apply_grain = dav1d->apply_grain;

            
                else if (c->export_side_data & AV_CODEC_EXPORT_DATA_FILM_GRAIN)

            
                    s.apply_grain = 0;


                s.all_layers = dav1d->all_layers;

            
                if (dav1d->operating_point >= 0)

            
                    s.operating_point = dav1d->operating_point;


                s.n_tile_threads = dav1d->tile_threads

            
                                 ? dav1d->tile_threads

            
                                 : FFMIN(floor(sqrt(threads)), DAV1D_MAX_TILE_THREADS);

            
                s.n_frame_threads = dav1d->frame_threads

            
                                  ? dav1d->frame_threads

            
                                  : FFMIN(ceil(threads / s.n_tile_threads), DAV1D_MAX_FRAME_THREADS);

            
                av_log(c, AV_LOG_DEBUG, "Using %d frame threads, %d tile threads\n",

            
                       s.n_frame_threads, s.n_tile_threads);


                res = dav1d_open(&dav1d->c, &s);

            
                if (res < 0)

            
                    return AVERROR(ENOMEM);


                return 0;

            
            }


            static void libdav1d_flush(AVCodecContext *c)

            
            {

            
                Libdav1dContext *dav1d = c->priv_data;


                dav1d_data_unref(&dav1d->data);

            
                dav1d_flush(dav1d->c);

            
            }


            static void libdav1d_data_free(const uint8_t *data, void *opaque) {

            
                AVBufferRef *buf = opaque;


                av_buffer_unref(&buf);

            
            }


            static void libdav1d_user_data_free(const uint8_t *data, void *opaque) {

            
                av_assert0(data == opaque);

            
                av_free(opaque);

            
            }


            static int libdav1d_receive_frame(AVCodecContext *c, AVFrame *frame)

            
            {

            
                Libdav1dContext *dav1d = c->priv_data;

            
                Dav1dData *data = &dav1d->data;

            
                Dav1dPicture pic = { 0 }, *p = &pic;

            
                int res;


                if (!data->sz) {

            
                    AVPacket pkt = { 0 };


                    res = ff_decode_get_packet(c, &pkt);

            
                    if (res < 0 && res != AVERROR_EOF)

            
                        return res;


                    if (pkt.size) {

            
                        res = dav1d_data_wrap(data, pkt.data, pkt.size, libdav1d_data_free, pkt.buf);

            
                        if (res < 0) {

            
                            av_packet_unref(&pkt);

            
                            return res;

            
                        }


                        data->m.timestamp = pkt.pts;

            
                        data->m.offset = pkt.pos;

            
                        data->m.duration = pkt.duration;


                        pkt.buf = NULL;

            
                        av_packet_unref(&pkt);


                        if (c->reordered_opaque != AV_NOPTS_VALUE) {

            
                            uint8_t *reordered_opaque = av_malloc(sizeof(c->reordered_opaque));

            
                            if (!reordered_opaque) {

            
                                dav1d_data_unref(data);

            
                                return AVERROR(ENOMEM);

            
                            }


                            memcpy(reordered_opaque, &c->reordered_opaque, sizeof(c->reordered_opaque));

            
                            res = dav1d_data_wrap_user_data(data, reordered_opaque,

            
                                                            libdav1d_user_data_free, reordered_opaque);

            
                            if (res < 0) {

            
                                av_free(reordered_opaque);

            
                                dav1d_data_unref(data);

            
                                return res;

            
                            }

            
                        }

            
                    }

            
                }


                res = dav1d_send_data(dav1d->c, data);

            
                if (res < 0) {

            
                    if (res == AVERROR(EINVAL))

            
                        res = AVERROR_INVALIDDATA;

            
                    if (res != AVERROR(EAGAIN))

            
                        return res;

            
                }


                res = dav1d_get_picture(dav1d->c, p);

            
                if (res < 0) {

            
                    if (res == AVERROR(EINVAL))

            
                        res = AVERROR_INVALIDDATA;

            
                    else if (res == AVERROR(EAGAIN) && c->internal->draining)

            
                        res = AVERROR_EOF;


                    return res;

            
                }


                av_assert0(p->data[0] && p->allocator_data);


                // This requires the custom allocator above

            
                frame->buf[0] = av_buffer_ref(p->allocator_data);

            
                if (!frame->buf[0]) {

            
                    dav1d_picture_unref(p);

            
                    return AVERROR(ENOMEM);

            
                }


                frame->data[0] = p->data[0];

            
                frame->data[1] = p->data[1];

            
                frame->data[2] = p->data[2];

            
                frame->linesize[0] = p->stride[0];

            
                frame->linesize[1] = p->stride[1];

            
                frame->linesize[2] = p->stride[1];


                c->profile = p->seq_hdr->profile;

            
                c->level = ((p->seq_hdr->operating_points[0].major_level - 2) << 2)

            
                           | p->seq_hdr->operating_points[0].minor_level;

            
                frame->width = p->p.w;

            
                frame->height = p->p.h;

            
                if (c->width != p->p.w || c->height != p->p.h) {

            
                    res = ff_set_dimensions(c, p->p.w, p->p.h);

            
                    if (res < 0)

            
                        goto fail;

            
                }


                av_reduce(&frame->sample_aspect_ratio.num,

            
                          &frame->sample_aspect_ratio.den,

            
                          frame->height * (int64_t)p->frame_hdr->render_width,

            
                          frame->width  * (int64_t)p->frame_hdr->render_height,

            
                          INT_MAX);

            
                ff_set_sar(c, frame->sample_aspect_ratio);


                switch (p->seq_hdr->chr) {

            
                case DAV1D_CHR_VERTICAL:

            
                    frame->chroma_location = c->chroma_sample_location = AVCHROMA_LOC_LEFT;

            
                    break;

            
                case DAV1D_CHR_COLOCATED:

            
                    frame->chroma_location = c->chroma_sample_location = AVCHROMA_LOC_TOPLEFT;

            
                    break;

            
                }

            
                frame->colorspace = c->colorspace = (enum AVColorSpace) p->seq_hdr->mtrx;

            
                frame->color_primaries = c->color_primaries = (enum AVColorPrimaries) p->seq_hdr->pri;

            
                frame->color_trc = c->color_trc = (enum AVColorTransferCharacteristic) p->seq_hdr->trc;

            
                frame->color_range = c->color_range = p->seq_hdr->color_range ? AVCOL_RANGE_JPEG : AVCOL_RANGE_MPEG;


                if (p->p.layout == DAV1D_PIXEL_LAYOUT_I444 &&

            
                    p->seq_hdr->mtrx == DAV1D_MC_IDENTITY &&

            
                    p->seq_hdr->pri  == DAV1D_COLOR_PRI_BT709 &&

            
                    p->seq_hdr->trc  == DAV1D_TRC_SRGB)

            
                    frame->format = c->pix_fmt = pix_fmt_rgb[p->seq_hdr->hbd];

            
                else

            
                    frame->format = c->pix_fmt = pix_fmt[p->p.layout][p->seq_hdr->hbd];


                if (p->m.user_data.data)

            
                    memcpy(&frame->reordered_opaque, p->m.user_data.data, sizeof(frame->reordered_opaque));

            
                else

            
                    frame->reordered_opaque = AV_NOPTS_VALUE;


                if (p->seq_hdr->num_units_in_tick && p->seq_hdr->time_scale) {

            
                    av_reduce(&c->framerate.den, &c->framerate.num,

            
                              p->seq_hdr->num_units_in_tick, p->seq_hdr->time_scale, INT_MAX);

            
                    if (p->seq_hdr->equal_picture_interval)

            
                        c->ticks_per_frame = p->seq_hdr->num_ticks_per_picture;

            
                }


                // match timestamps and packet size

            
                frame->pts = frame->best_effort_timestamp = p->m.timestamp;

            
            #if FF_API_PKT_PTS

            
            FF_DISABLE_DEPRECATION_WARNINGS

            
                frame->pkt_pts = p->m.timestamp;

            
            FF_ENABLE_DEPRECATION_WARNINGS

            
            #endif

            
                frame->pkt_dts = p->m.timestamp;

            
                frame->pkt_pos = p->m.offset;

            
                frame->pkt_size = p->m.size;

            
                frame->pkt_duration = p->m.duration;

            
                frame->key_frame = p->frame_hdr->frame_type == DAV1D_FRAME_TYPE_KEY;


                switch (p->frame_hdr->frame_type) {

            
                case DAV1D_FRAME_TYPE_KEY:

            
                case DAV1D_FRAME_TYPE_INTRA:

            
                    frame->pict_type = AV_PICTURE_TYPE_I;

            
                    break;

            
                case DAV1D_FRAME_TYPE_INTER:

            
                    frame->pict_type = AV_PICTURE_TYPE_P;

            
                    break;

            
                case DAV1D_FRAME_TYPE_SWITCH:

            
                    frame->pict_type = AV_PICTURE_TYPE_SP;

            
                    break;

            
                default:

            
                    res = AVERROR_INVALIDDATA;

            
                    goto fail;

            
                }


                if (p->mastering_display) {

            
                    AVMasteringDisplayMetadata *mastering = av_mastering_display_metadata_create_side_data(frame);

            
                    if (!mastering) {

            
                        res = AVERROR(ENOMEM);

            
                        goto fail;

            
                    }


                    for (int i = 0; i < 3; i++) {

            
                        mastering->display_primaries[i][0] = av_make_q(p->mastering_display->primaries[i][0], 1 << 16);

            
                        mastering->display_primaries[i][1] = av_make_q(p->mastering_display->primaries[i][1], 1 << 16);

            
                    }

            
                    mastering->white_point[0] = av_make_q(p->mastering_display->white_point[0], 1 << 16);

            
                    mastering->white_point[1] = av_make_q(p->mastering_display->white_point[1], 1 << 16);


                    mastering->max_luminance = av_make_q(p->mastering_display->max_luminance, 1 << 8);

            
                    mastering->min_luminance = av_make_q(p->mastering_display->min_luminance, 1 << 14);


                    mastering->has_primaries = 1;

            
                    mastering->has_luminance = 1;

            
                }

            
                if (p->content_light) {

            
                    AVContentLightMetadata *light = av_content_light_metadata_create_side_data(frame);

            
                    if (!light) {

            
                        res = AVERROR(ENOMEM);

            
                        goto fail;

            
                    }

            
                    light->MaxCLL = p->content_light->max_content_light_level;

            
                    light->MaxFALL = p->content_light->max_frame_average_light_level;

            
                }

            
                if (p->itut_t35) {

            
                    GetByteContext gb;

            
                    unsigned int user_identifier;


                    bytestream2_init(&gb, p->itut_t35->payload, p->itut_t35->payload_size);

            
                    bytestream2_skip(&gb, 1); // terminal provider code

            
                    bytestream2_skip(&gb, 1); // terminal provider oriented code

            
                    user_identifier = bytestream2_get_be32(&gb);

            
                    switch (user_identifier) {

            
                    case MKBETAG('G', 'A', '9', '4'): { // closed captions

            
                        AVBufferRef *buf = NULL;


                        res = ff_parse_a53_cc(&buf, gb.buffer, bytestream2_get_bytes_left(&gb));

            
                        if (res < 0)

            
                            goto fail;

            
                        if (!res)

            
                            break;


                        if (!av_frame_new_side_data_from_buf(frame, AV_FRAME_DATA_A53_CC, buf))

            
                            av_buffer_unref(&buf);


                        c->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;

            
                        break;

            
                    }

            
                    default: // ignore unsupported identifiers

            
                        break;

            
                    }

            
                }

            
                if (p->frame_hdr->film_grain.present && (!dav1d->apply_grain ||

            
                    (c->export_side_data & AV_CODEC_EXPORT_DATA_FILM_GRAIN))) {

            
                    AVFilmGrainParams *fgp = av_film_grain_params_create_side_data(frame);

            
                    if (!fgp) {

            
                        res = AVERROR(ENOMEM);

            
                        goto fail;

            
                    }


                    fgp->type = AV_FILM_GRAIN_PARAMS_AV1;

            
                    fgp->seed = p->frame_hdr->film_grain.data.seed;

            
                    fgp->codec.aom.num_y_points = p->frame_hdr->film_grain.data.num_y_points;

            
                    fgp->codec.aom.chroma_scaling_from_luma = p->frame_hdr->film_grain.data.chroma_scaling_from_luma;

            
                    fgp->codec.aom.scaling_shift = p->frame_hdr->film_grain.data.scaling_shift;

            
                    fgp->codec.aom.ar_coeff_lag = p->frame_hdr->film_grain.data.ar_coeff_lag;

            
                    fgp->codec.aom.ar_coeff_shift = p->frame_hdr->film_grain.data.ar_coeff_shift;

            
                    fgp->codec.aom.grain_scale_shift = p->frame_hdr->film_grain.data.grain_scale_shift;

            
                    fgp->codec.aom.overlap_flag = p->frame_hdr->film_grain.data.overlap_flag;

            
                    fgp->codec.aom.limit_output_range = p->frame_hdr->film_grain.data.clip_to_restricted_range;


                    memcpy(&fgp->codec.aom.y_points, &p->frame_hdr->film_grain.data.y_points,

            
                           sizeof(fgp->codec.aom.y_points));

            
                    memcpy(&fgp->codec.aom.num_uv_points, &p->frame_hdr->film_grain.data.num_uv_points,

            
                           sizeof(fgp->codec.aom.num_uv_points));

            
                    memcpy(&fgp->codec.aom.uv_points, &p->frame_hdr->film_grain.data.uv_points,

            
                           sizeof(fgp->codec.aom.uv_points));

            
                    memcpy(&fgp->codec.aom.ar_coeffs_y, &p->frame_hdr->film_grain.data.ar_coeffs_y,

            
                           sizeof(fgp->codec.aom.ar_coeffs_y));

            
                    memcpy(&fgp->codec.aom.ar_coeffs_uv[0], &p->frame_hdr->film_grain.data.ar_coeffs_uv[0],

            
                           sizeof(fgp->codec.aom.ar_coeffs_uv[0]));

            
                    memcpy(&fgp->codec.aom.ar_coeffs_uv[1], &p->frame_hdr->film_grain.data.ar_coeffs_uv[1],

            
                           sizeof(fgp->codec.aom.ar_coeffs_uv[1]));

            
                    memcpy(&fgp->codec.aom.uv_mult, &p->frame_hdr->film_grain.data.uv_mult,

            
                           sizeof(fgp->codec.aom.uv_mult));

            
                    memcpy(&fgp->codec.aom.uv_mult_luma, &p->frame_hdr->film_grain.data.uv_luma_mult,

            
                           sizeof(fgp->codec.aom.uv_mult_luma));

            
                    memcpy(&fgp->codec.aom.uv_offset, &p->frame_hdr->film_grain.data.uv_offset,

            
                           sizeof(fgp->codec.aom.uv_offset));

            
                }


                res = 0;

            
            fail:

            
                dav1d_picture_unref(p);

            
                if (res < 0)

            
                    av_frame_unref(frame);

            
                return res;

            
            }


            static av_cold int libdav1d_close(AVCodecContext *c)

            
            {

            
                Libdav1dContext *dav1d = c->priv_data;


                av_buffer_pool_uninit(&dav1d->pool);

            
                dav1d_data_unref(&dav1d->data);

            
                dav1d_close(&dav1d->c);


                return 0;

            
            }


            #define OFFSET(x) offsetof(Libdav1dContext, x)

            
            #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM

            
            static const AVOption libdav1d_options[] = {

            
                { "tilethreads", "Tile threads", OFFSET(tile_threads), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, DAV1D_MAX_TILE_THREADS, VD },

            
                { "framethreads", "Frame threads", OFFSET(frame_threads), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, DAV1D_MAX_FRAME_THREADS, VD },

            
                { "filmgrain", "Apply Film Grain", OFFSET(apply_grain), AV_OPT_TYPE_BOOL, { .i64 = -1 }, -1, 1, VD | AV_OPT_FLAG_DEPRECATED },

            
                { "oppoint",  "Select an operating point of the scalable bitstream", OFFSET(operating_point), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 31, VD },

            
                { "alllayers", "Output all spatial layers", OFFSET(all_layers), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VD },

            
                { NULL }

            
            };


            static const AVClass libdav1d_class = {

            
                .class_name = "libdav1d decoder",

            
                .item_name  = av_default_item_name,

            
                .option     = libdav1d_options,

            
                .version    = LIBAVUTIL_VERSION_INT,

            
            };


            AVCodec ff_libdav1d_decoder = {

            
                .name           = "libdav1d",

            
                .long_name      = NULL_IF_CONFIG_SMALL("dav1d AV1 decoder by VideoLAN"),

            
                .type           = AVMEDIA_TYPE_VIDEO,

            
                .id             = AV_CODEC_ID_AV1,

            
                .priv_data_size = sizeof(Libdav1dContext),

            
                .init           = libdav1d_init,

            
                .close          = libdav1d_close,

            
                .flush          = libdav1d_flush,

            
                .receive_frame  = libdav1d_receive_frame,

            
                .capabilities   = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_AUTO_THREADS,

            
                .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_SETS_PKT_DTS,

            
                .priv_class     = &libdav1d_class,

            
                .wrapper_name   = "libdav1d",

            
            };
	/*
	* Copyright (c) 2018 Ronald S. Bultje <rsbultje gmail com>
	* Copyright (c) 2018 James Almer <jamrial gmail com>
	*
	* 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 <dav1d/dav1d.h>

	#include "libavutil/avassert.h"
	#include "libavutil/film_grain_params.h"
	#include "libavutil/mastering_display_metadata.h"
	#include "libavutil/imgutils.h"
	#include "libavutil/opt.h"

	#include "atsc_a53.h"
	#include "avcodec.h"
	#include "bytestream.h"
	#include "decode.h"
	#include "internal.h"

	typedef struct Libdav1dContext {
	AVClass *class;
	Dav1dContext *c;
	AVBufferPool *pool;
	int pool_size;

	Dav1dData data;
	int tile_threads;
	int frame_threads;
	int apply_grain;
	int operating_point;
	int all_layers;
	} Libdav1dContext;

	static const enum AVPixelFormat pix_fmt[][3] = {
	[DAV1D_PIXEL_LAYOUT_I400] = { AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12 },
	[DAV1D_PIXEL_LAYOUT_I420] = { AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV420P12 },
	[DAV1D_PIXEL_LAYOUT_I422] = { AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV422P12 },
	[DAV1D_PIXEL_LAYOUT_I444] = { AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV444P10, AV_PIX_FMT_YUV444P12 },
	};

	static const enum AVPixelFormat pix_fmt_rgb[3] = {
	AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRP10, AV_PIX_FMT_GBRP12,
	};

	static void libdav1d_log_callback(void opaque, const char fmt, va_list vl)
	{
	AVCodecContext *c = opaque;

	av_vlog(c, AV_LOG_ERROR, fmt, vl);
	}

	static int libdav1d_picture_allocator(Dav1dPicture p, void cookie)
	{
	Libdav1dContext *dav1d = cookie;
	enum AVPixelFormat format = pix_fmt[p->p.layout][p->seq_hdr->hbd];
	int ret, linesize[4], h = FFALIGN(p->p.h, 128), w = FFALIGN(p->p.w, 128);
	uint8_t aligned_ptr, data[4];
	AVBufferRef *buf;

	ret = av_image_get_buffer_size(format, w, h, DAV1D_PICTURE_ALIGNMENT);
	if (ret < 0)
	return ret;

	if (ret != dav1d->pool_size) {
	av_buffer_pool_uninit(&dav1d->pool);
	// Use twice the amount of required padding bytes for aligned_ptr below.
	dav1d->pool = av_buffer_pool_init(ret + DAV1D_PICTURE_ALIGNMENT * 2, NULL);
	if (!dav1d->pool) {
	dav1d->pool_size = 0;
	return AVERROR(ENOMEM);
	}
	dav1d->pool_size = ret;
	}
	buf = av_buffer_pool_get(dav1d->pool);
	if (!buf)
	return AVERROR(ENOMEM);

	// libdav1d requires DAV1D_PICTURE_ALIGNMENT aligned buffers, which av_malloc()
	// doesn't guarantee for example when AVX is disabled at configure time.
	// Use the extra DAV1D_PICTURE_ALIGNMENT padding bytes in the buffer to align it
	// if required.
	aligned_ptr = (uint8_t *)FFALIGN((uintptr_t)buf->data, DAV1D_PICTURE_ALIGNMENT);
	ret = av_image_fill_arrays(data, linesize, aligned_ptr, format, w, h,
	DAV1D_PICTURE_ALIGNMENT);
	if (ret < 0) {
	av_buffer_unref(&buf);
	return ret;
	}

	p->data[0] = data[0];
	p->data[1] = data[1];
	p->data[2] = data[2];
	p->stride[0] = linesize[0];
	p->stride[1] = linesize[1];
	p->allocator_data = buf;

	return 0;
	}

	static void libdav1d_picture_release(Dav1dPicture p, void cookie)
	{
	AVBufferRef *buf = p->allocator_data;

	av_buffer_unref(&buf);
	}

	static av_cold int libdav1d_init(AVCodecContext *c)
	{
	Libdav1dContext *dav1d = c->priv_data;
	Dav1dSettings s;
	int threads = (c->thread_count ? c->thread_count : av_cpu_count()) * 3 / 2;
	int res;

	av_log(c, AV_LOG_INFO, "libdav1d %s\n", dav1d_version());

	dav1d_default_settings(&s);
	s.logger.cookie = c;
	s.logger.callback = libdav1d_log_callback;
	s.allocator.cookie = dav1d;
	s.allocator.alloc_picture_callback = libdav1d_picture_allocator;
	s.allocator.release_picture_callback = libdav1d_picture_release;
	s.frame_size_limit = c->max_pixels;
	if (dav1d->apply_grain >= 0)
	s.apply_grain = dav1d->apply_grain;
	else if (c->export_side_data & AV_CODEC_EXPORT_DATA_FILM_GRAIN)
	s.apply_grain = 0;

	s.all_layers = dav1d->all_layers;
	if (dav1d->operating_point >= 0)
	s.operating_point = dav1d->operating_point;

	s.n_tile_threads = dav1d->tile_threads
	? dav1d->tile_threads
	: FFMIN(floor(sqrt(threads)), DAV1D_MAX_TILE_THREADS);
	s.n_frame_threads = dav1d->frame_threads
	? dav1d->frame_threads
	: FFMIN(ceil(threads / s.n_tile_threads), DAV1D_MAX_FRAME_THREADS);
	av_log(c, AV_LOG_DEBUG, "Using %d frame threads, %d tile threads\n",
	s.n_frame_threads, s.n_tile_threads);

	res = dav1d_open(&dav1d->c, &s);
	if (res < 0)
	return AVERROR(ENOMEM);

	return 0;
	}

	static void libdav1d_flush(AVCodecContext *c)
	{
	Libdav1dContext *dav1d = c->priv_data;

	dav1d_data_unref(&dav1d->data);
	dav1d_flush(dav1d->c);
	}

	static void libdav1d_data_free(const uint8_t data, void opaque) {
	AVBufferRef *buf = opaque;

	av_buffer_unref(&buf);
	}

	static void libdav1d_user_data_free(const uint8_t data, void opaque) {
	av_assert0(data == opaque);
	av_free(opaque);
	}

	static int libdav1d_receive_frame(AVCodecContext c, AVFrame frame)
	{
	Libdav1dContext *dav1d = c->priv_data;
	Dav1dData *data = &dav1d->data;
	Dav1dPicture pic = { 0 }, *p = &pic;
	int res;

	if (!data->sz) {
	AVPacket pkt = { 0 };

	res = ff_decode_get_packet(c, &pkt);
	if (res < 0 && res != AVERROR_EOF)
	return res;

	if (pkt.size) {
	res = dav1d_data_wrap(data, pkt.data, pkt.size, libdav1d_data_free, pkt.buf);
	if (res < 0) {
	av_packet_unref(&pkt);
	return res;
	}

	data->m.timestamp = pkt.pts;
	data->m.offset = pkt.pos;
	data->m.duration = pkt.duration;

	pkt.buf = NULL;
	av_packet_unref(&pkt);

	if (c->reordered_opaque != AV_NOPTS_VALUE) {
	uint8_t *reordered_opaque = av_malloc(sizeof(c->reordered_opaque));
	if (!reordered_opaque) {
	dav1d_data_unref(data);
	return AVERROR(ENOMEM);
	}

	memcpy(reordered_opaque, &c->reordered_opaque, sizeof(c->reordered_opaque));
	res = dav1d_data_wrap_user_data(data, reordered_opaque,
	libdav1d_user_data_free, reordered_opaque);
	if (res < 0) {
	av_free(reordered_opaque);
	dav1d_data_unref(data);
	return res;
	}
	}
	}
	}

	res = dav1d_send_data(dav1d->c, data);
	if (res < 0) {
	if (res == AVERROR(EINVAL))
	res = AVERROR_INVALIDDATA;
	if (res != AVERROR(EAGAIN))
	return res;
	}

	res = dav1d_get_picture(dav1d->c, p);
	if (res < 0) {
	if (res == AVERROR(EINVAL))
	res = AVERROR_INVALIDDATA;
	else if (res == AVERROR(EAGAIN) && c->internal->draining)
	res = AVERROR_EOF;

	return res;
	}

	av_assert0(p->data[0] && p->allocator_data);

	// This requires the custom allocator above
	frame->buf[0] = av_buffer_ref(p->allocator_data);
	if (!frame->buf[0]) {
	dav1d_picture_unref(p);
	return AVERROR(ENOMEM);
	}

	frame->data[0] = p->data[0];
	frame->data[1] = p->data[1];
	frame->data[2] = p->data[2];
	frame->linesize[0] = p->stride[0];
	frame->linesize[1] = p->stride[1];
	frame->linesize[2] = p->stride[1];

	c->profile = p->seq_hdr->profile;
	c->level = ((p->seq_hdr->operating_points[0].major_level - 2) << 2)
	\| p->seq_hdr->operating_points[0].minor_level;
	frame->width = p->p.w;
	frame->height = p->p.h;
	if (c->width != p->p.w \|\| c->height != p->p.h) {
	res = ff_set_dimensions(c, p->p.w, p->p.h);
	if (res < 0)
	goto fail;
	}

	av_reduce(&frame->sample_aspect_ratio.num,
	&frame->sample_aspect_ratio.den,
	frame->height * (int64_t)p->frame_hdr->render_width,
	frame->width * (int64_t)p->frame_hdr->render_height,
	INT_MAX);
	ff_set_sar(c, frame->sample_aspect_ratio);

	switch (p->seq_hdr->chr) {
	case DAV1D_CHR_VERTICAL:
	frame->chroma_location = c->chroma_sample_location = AVCHROMA_LOC_LEFT;
	break;
	case DAV1D_CHR_COLOCATED:
	frame->chroma_location = c->chroma_sample_location = AVCHROMA_LOC_TOPLEFT;
	break;
	}
	frame->colorspace = c->colorspace = (enum AVColorSpace) p->seq_hdr->mtrx;
	frame->color_primaries = c->color_primaries = (enum AVColorPrimaries) p->seq_hdr->pri;
	frame->color_trc = c->color_trc = (enum AVColorTransferCharacteristic) p->seq_hdr->trc;
	frame->color_range = c->color_range = p->seq_hdr->color_range ? AVCOL_RANGE_JPEG : AVCOL_RANGE_MPEG;

	if (p->p.layout == DAV1D_PIXEL_LAYOUT_I444 &&
	p->seq_hdr->mtrx == DAV1D_MC_IDENTITY &&
	p->seq_hdr->pri == DAV1D_COLOR_PRI_BT709 &&
	p->seq_hdr->trc == DAV1D_TRC_SRGB)
	frame->format = c->pix_fmt = pix_fmt_rgb[p->seq_hdr->hbd];
	else
	frame->format = c->pix_fmt = pix_fmt[p->p.layout][p->seq_hdr->hbd];

	if (p->m.user_data.data)
	memcpy(&frame->reordered_opaque, p->m.user_data.data, sizeof(frame->reordered_opaque));
	else
	frame->reordered_opaque = AV_NOPTS_VALUE;

	if (p->seq_hdr->num_units_in_tick && p->seq_hdr->time_scale) {
	av_reduce(&c->framerate.den, &c->framerate.num,
	p->seq_hdr->num_units_in_tick, p->seq_hdr->time_scale, INT_MAX);
	if (p->seq_hdr->equal_picture_interval)
	c->ticks_per_frame = p->seq_hdr->num_ticks_per_picture;
	}

	// match timestamps and packet size
	frame->pts = frame->best_effort_timestamp = p->m.timestamp;
	#if FF_API_PKT_PTS
	FF_DISABLE_DEPRECATION_WARNINGS
	frame->pkt_pts = p->m.timestamp;
	FF_ENABLE_DEPRECATION_WARNINGS
	#endif
	frame->pkt_dts = p->m.timestamp;
	frame->pkt_pos = p->m.offset;
	frame->pkt_size = p->m.size;
	frame->pkt_duration = p->m.duration;
	frame->key_frame = p->frame_hdr->frame_type == DAV1D_FRAME_TYPE_KEY;

	switch (p->frame_hdr->frame_type) {
	case DAV1D_FRAME_TYPE_KEY:
	case DAV1D_FRAME_TYPE_INTRA:
	frame->pict_type = AV_PICTURE_TYPE_I;
	break;
	case DAV1D_FRAME_TYPE_INTER:
	frame->pict_type = AV_PICTURE_TYPE_P;
	break;
	case DAV1D_FRAME_TYPE_SWITCH:
	frame->pict_type = AV_PICTURE_TYPE_SP;
	break;
	default:
	res = AVERROR_INVALIDDATA;
	goto fail;
	}

	if (p->mastering_display) {
	AVMasteringDisplayMetadata *mastering = av_mastering_display_metadata_create_side_data(frame);
	if (!mastering) {
	res = AVERROR(ENOMEM);
	goto fail;
	}

	for (int i = 0; i < 3; i++) {
	mastering->display_primaries[i][0] = av_make_q(p->mastering_display->primaries[i][0], 1 << 16);
	mastering->display_primaries[i][1] = av_make_q(p->mastering_display->primaries[i][1], 1 << 16);
	}
	mastering->white_point[0] = av_make_q(p->mastering_display->white_point[0], 1 << 16);
	mastering->white_point[1] = av_make_q(p->mastering_display->white_point[1], 1 << 16);

	mastering->max_luminance = av_make_q(p->mastering_display->max_luminance, 1 << 8);
	mastering->min_luminance = av_make_q(p->mastering_display->min_luminance, 1 << 14);

	mastering->has_primaries = 1;
	mastering->has_luminance = 1;
	}
	if (p->content_light) {
	AVContentLightMetadata *light = av_content_light_metadata_create_side_data(frame);
	if (!light) {
	res = AVERROR(ENOMEM);
	goto fail;
	}
	light->MaxCLL = p->content_light->max_content_light_level;
	light->MaxFALL = p->content_light->max_frame_average_light_level;
	}
	if (p->itut_t35) {
	GetByteContext gb;
	unsigned int user_identifier;

	bytestream2_init(&gb, p->itut_t35->payload, p->itut_t35->payload_size);
	bytestream2_skip(&gb, 1); // terminal provider code
	bytestream2_skip(&gb, 1); // terminal provider oriented code
	user_identifier = bytestream2_get_be32(&gb);
	switch (user_identifier) {
	case MKBETAG('G', 'A', '9', '4'): { // closed captions
	AVBufferRef *buf = NULL;

	res = ff_parse_a53_cc(&buf, gb.buffer, bytestream2_get_bytes_left(&gb));
	if (res < 0)
	goto fail;
	if (!res)
	break;

	if (!av_frame_new_side_data_from_buf(frame, AV_FRAME_DATA_A53_CC, buf))
	av_buffer_unref(&buf);

	c->properties \|= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
	break;
	}
	default: // ignore unsupported identifiers
	break;
	}
	}
	if (p->frame_hdr->film_grain.present && (!dav1d->apply_grain \|\|
	(c->export_side_data & AV_CODEC_EXPORT_DATA_FILM_GRAIN))) {
	AVFilmGrainParams *fgp = av_film_grain_params_create_side_data(frame);
	if (!fgp) {
	res = AVERROR(ENOMEM);
	goto fail;
	}

	fgp->type = AV_FILM_GRAIN_PARAMS_AV1;
	fgp->seed = p->frame_hdr->film_grain.data.seed;
	fgp->codec.aom.num_y_points = p->frame_hdr->film_grain.data.num_y_points;
	fgp->codec.aom.chroma_scaling_from_luma = p->frame_hdr->film_grain.data.chroma_scaling_from_luma;
	fgp->codec.aom.scaling_shift = p->frame_hdr->film_grain.data.scaling_shift;
	fgp->codec.aom.ar_coeff_lag = p->frame_hdr->film_grain.data.ar_coeff_lag;
	fgp->codec.aom.ar_coeff_shift = p->frame_hdr->film_grain.data.ar_coeff_shift;
	fgp->codec.aom.grain_scale_shift = p->frame_hdr->film_grain.data.grain_scale_shift;
	fgp->codec.aom.overlap_flag = p->frame_hdr->film_grain.data.overlap_flag;
	fgp->codec.aom.limit_output_range = p->frame_hdr->film_grain.data.clip_to_restricted_range;

	memcpy(&fgp->codec.aom.y_points, &p->frame_hdr->film_grain.data.y_points,
	sizeof(fgp->codec.aom.y_points));
	memcpy(&fgp->codec.aom.num_uv_points, &p->frame_hdr->film_grain.data.num_uv_points,
	sizeof(fgp->codec.aom.num_uv_points));
	memcpy(&fgp->codec.aom.uv_points, &p->frame_hdr->film_grain.data.uv_points,
	sizeof(fgp->codec.aom.uv_points));
	memcpy(&fgp->codec.aom.ar_coeffs_y, &p->frame_hdr->film_grain.data.ar_coeffs_y,
	sizeof(fgp->codec.aom.ar_coeffs_y));
	memcpy(&fgp->codec.aom.ar_coeffs_uv[0], &p->frame_hdr->film_grain.data.ar_coeffs_uv[0],
	sizeof(fgp->codec.aom.ar_coeffs_uv[0]));
	memcpy(&fgp->codec.aom.ar_coeffs_uv[1], &p->frame_hdr->film_grain.data.ar_coeffs_uv[1],
	sizeof(fgp->codec.aom.ar_coeffs_uv[1]));
	memcpy(&fgp->codec.aom.uv_mult, &p->frame_hdr->film_grain.data.uv_mult,
	sizeof(fgp->codec.aom.uv_mult));
	memcpy(&fgp->codec.aom.uv_mult_luma, &p->frame_hdr->film_grain.data.uv_luma_mult,
	sizeof(fgp->codec.aom.uv_mult_luma));
	memcpy(&fgp->codec.aom.uv_offset, &p->frame_hdr->film_grain.data.uv_offset,
	sizeof(fgp->codec.aom.uv_offset));
	}

	res = 0;
	fail:
	dav1d_picture_unref(p);
	if (res < 0)
	av_frame_unref(frame);
	return res;
	}

	static av_cold int libdav1d_close(AVCodecContext *c)
	{
	Libdav1dContext *dav1d = c->priv_data;

	av_buffer_pool_uninit(&dav1d->pool);
	dav1d_data_unref(&dav1d->data);
	dav1d_close(&dav1d->c);

	return 0;
	}

	#define OFFSET(x) offsetof(Libdav1dContext, x)
	#define VD AV_OPT_FLAG_VIDEO_PARAM \| AV_OPT_FLAG_DECODING_PARAM
	static const AVOption libdav1d_options[] = {
	{ "tilethreads", "Tile threads", OFFSET(tile_threads), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, DAV1D_MAX_TILE_THREADS, VD },
	{ "framethreads", "Frame threads", OFFSET(frame_threads), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, DAV1D_MAX_FRAME_THREADS, VD },
	{ "filmgrain", "Apply Film Grain", OFFSET(apply_grain), AV_OPT_TYPE_BOOL, { .i64 = -1 }, -1, 1, VD \| AV_OPT_FLAG_DEPRECATED },
	{ "oppoint", "Select an operating point of the scalable bitstream", OFFSET(operating_point), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 31, VD },
	{ "alllayers", "Output all spatial layers", OFFSET(all_layers), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VD },
	{ NULL }
	};

	static const AVClass libdav1d_class = {
	.class_name = "libdav1d decoder",
	.item_name = av_default_item_name,
	.option = libdav1d_options,
	.version = LIBAVUTIL_VERSION_INT,
	};

	AVCodec ff_libdav1d_decoder = {
	.name = "libdav1d",
	.long_name = NULL_IF_CONFIG_SMALL("dav1d AV1 decoder by VideoLAN"),
	.type = AVMEDIA_TYPE_VIDEO,
	.id = AV_CODEC_ID_AV1,
	.priv_data_size = sizeof(Libdav1dContext),
	.init = libdav1d_init,
	.close = libdav1d_close,
	.flush = libdav1d_flush,
	.receive_frame = libdav1d_receive_frame,
	.capabilities = AV_CODEC_CAP_DELAY \| AV_CODEC_CAP_AUTO_THREADS,
	.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE \| FF_CODEC_CAP_SETS_PKT_DTS,
	.priv_class = &libdav1d_class,
	.wrapper_name = "libdav1d",
	};