avcodec: add AV1 hardware accelerated decoder

This AV1 decoder is currently only used for hardware accelerated decoding.
It can be extended into a native decoder in the future, so set its name to
"av1" and temporarily give it the lowest priority in the codec list.

Signed-off-by: Fei Wang <fei.w.wang@intel.com>
Signed-off-by: James Almer <jamrial@gmail.com>

1 files changed, 852 insertions, 0 deletions

diff --git a/libavcodec/av1dec.c b/libavcodec/av1dec.c
new file mode 100644
index 0000000000..c22606c3ef
--- /dev/null
+++ b/libavcodec/av1dec.c
@@ -0,0 +1,852 @@
+/*
+ * AV1 video decoder
+ *
+ * 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 "libavutil/pixdesc.h"
+#include "avcodec.h"
+#include "av1dec.h"
+#include "get_bits.h"
+#include "hwconfig.h"
+#include "internal.h"
+#include "profiles.h"
+
+static void setup_past_independence(AV1Frame *f)
+{
+    f->loop_filter_delta_enabled = 1;
+
+    f->loop_filter_ref_deltas[AV1_REF_FRAME_INTRA] = 1;
+    f->loop_filter_ref_deltas[AV1_REF_FRAME_LAST] = 0;
+    f->loop_filter_ref_deltas[AV1_REF_FRAME_LAST2] = 0;
+    f->loop_filter_ref_deltas[AV1_REF_FRAME_LAST3] = 0;
+    f->loop_filter_ref_deltas[AV1_REF_FRAME_GOLDEN] = -1;
+    f->loop_filter_ref_deltas[AV1_REF_FRAME_BWDREF] = 0;
+    f->loop_filter_ref_deltas[AV1_REF_FRAME_ALTREF2] = -1;
+    f->loop_filter_ref_deltas[AV1_REF_FRAME_ALTREF] = -1;
+
+    f->loop_filter_mode_deltas[0] = 0;
+    f->loop_filter_mode_deltas[1] = 0;
+}
+
+static void load_previous_and_update(AV1DecContext *s)
+{
+    uint8_t primary_frame, prev_frame;
+
+    primary_frame = s->raw_frame_header->primary_ref_frame;
+    prev_frame = s->raw_frame_header->ref_frame_idx[primary_frame];
+    memcpy(s->cur_frame.loop_filter_ref_deltas,
+           s->ref[prev_frame].loop_filter_ref_deltas,
+           AV1_NUM_REF_FRAMES * sizeof(int8_t));
+    memcpy(s->cur_frame.loop_filter_mode_deltas,
+           s->ref[prev_frame].loop_filter_mode_deltas,
+           2 * sizeof(int8_t));
+
+    if (s->raw_frame_header->loop_filter_delta_update) {
+        for (int i = 0; i < AV1_NUM_REF_FRAMES; i++) {
+            if (s->raw_frame_header->update_ref_delta[i])
+                s->cur_frame.loop_filter_ref_deltas[i] =
+                    s->raw_frame_header->loop_filter_ref_deltas[i];
+        }
+
+        for (int i = 0; i < 2; i++) {
+            if (s->raw_frame_header->update_mode_delta[i])
+                s->cur_frame.loop_filter_mode_deltas[i] =
+                    s->raw_frame_header->loop_filter_mode_deltas[i];
+        }
+    }
+
+    s->cur_frame.loop_filter_delta_enabled =
+        s->raw_frame_header->loop_filter_delta_enabled;
+}
+
+static uint32_t inverse_recenter(int r, uint32_t v)
+{
+    if (v > 2 * r)
+        return v;
+    else if (v & 1)
+        return r - ((v + 1) >> 1);
+    else
+        return r + (v >> 1);
+}
+
+static uint32_t decode_unsigned_subexp_with_ref(uint32_t sub_exp,
+                                                int mx, int r)
+{
+    if ((r << 1) <= mx) {
+        return inverse_recenter(r, sub_exp);
+    } else {
+        return mx - 1 - inverse_recenter(mx - 1 - r, sub_exp);
+    }
+}
+
+static int32_t decode_signed_subexp_with_ref(uint32_t sub_exp, int low,
+                                             int high, int r)
+{
+    int32_t x = decode_unsigned_subexp_with_ref(sub_exp, high - low, r - low);
+    return x + low;
+}
+
+static void read_global_param(AV1DecContext *s, int type, int ref, int idx)
+{
+    uint8_t primary_frame, prev_frame;
+    uint32_t abs_bits, prec_bits, round, prec_diff, sub, mx;
+    int32_t r;
+
+    primary_frame = s->raw_frame_header->primary_ref_frame;
+    prev_frame = s->raw_frame_header->ref_frame_idx[primary_frame];
+    abs_bits = AV1_GM_ABS_ALPHA_BITS;
+    prec_bits = AV1_GM_ALPHA_PREC_BITS;
+
+    if (idx < 2) {
+        if (type == AV1_WARP_MODEL_TRANSLATION) {
+            abs_bits = AV1_GM_ABS_TRANS_ONLY_BITS -
+                !s->raw_frame_header->allow_high_precision_mv;
+            prec_bits = AV1_GM_TRANS_ONLY_PREC_BITS -
+                !s->raw_frame_header->allow_high_precision_mv;
+        } else {
+            abs_bits = AV1_GM_ABS_TRANS_BITS;
+            prec_bits = AV1_GM_TRANS_PREC_BITS;
+        }
+    }
+    round = (idx % 3) == 2 ? (1 << AV1_WARPEDMODEL_PREC_BITS) : 0;
+    prec_diff = AV1_WARPEDMODEL_PREC_BITS - prec_bits;
+    sub = (idx % 3) == 2 ? (1 << prec_bits) : 0;
+    mx = 1 << abs_bits;
+    r = (s->ref[prev_frame].gm_params[ref][idx] >> prec_diff) - sub;
+
+    s->cur_frame.gm_params[ref][idx] =
+        (decode_signed_subexp_with_ref(s->raw_frame_header->gm_params[ref][idx],
+                                       -mx, mx + 1, r) << prec_diff) + round;
+}
+
+/**
+* update gm type/params, since cbs already implemented part of this funcation,
+* so we don't need to full implement spec.
+*/
+static void global_motion_params(AV1DecContext *s)
+{
+    const AV1RawFrameHeader *header = s->raw_frame_header;
+    int type, ref;
+
+    for (ref = AV1_REF_FRAME_LAST; ref <= AV1_REF_FRAME_ALTREF; ref++) {
+        s->cur_frame.gm_type[ref] = AV1_WARP_MODEL_IDENTITY;
+        for (int i = 0; i < 6; i++)
+            s->cur_frame.gm_params[ref][i] = (i % 3 == 2) ?
+                                             1 << AV1_WARPEDMODEL_PREC_BITS : 0;
+    }
+    if (header->frame_type == AV1_FRAME_KEY ||
+        header->frame_type == AV1_FRAME_INTRA_ONLY)
+        return;
+
+    for (ref = AV1_REF_FRAME_LAST; ref <= AV1_REF_FRAME_ALTREF; ref++) {
+        if (header->is_global[ref]) {
+            if (header->is_rot_zoom[ref]) {
+                type = AV1_WARP_MODEL_ROTZOOM;
+            } else {
+                type = header->is_translation[ref] ? AV1_WARP_MODEL_TRANSLATION
+                                                   : AV1_WARP_MODEL_AFFINE;
+            }
+        } else {
+            type = AV1_WARP_MODEL_IDENTITY;
+        }
+        s->cur_frame.gm_type[ref] = type;
+
+        if (type >= AV1_WARP_MODEL_ROTZOOM) {
+            read_global_param(s, type, ref, 2);
+            read_global_param(s, type, ref, 3);
+            if (type == AV1_WARP_MODEL_AFFINE) {
+                read_global_param(s, type, ref, 4);
+                read_global_param(s, type, ref, 5);
+            } else {
+                s->cur_frame.gm_params[ref][4] = -s->cur_frame.gm_params[ref][3];
+                s->cur_frame.gm_params[ref][5] = s->cur_frame.gm_params[ref][2];
+            }
+        }
+        if (type >= AV1_WARP_MODEL_TRANSLATION) {
+            read_global_param(s, type, ref, 0);
+            read_global_param(s, type, ref, 1);
+        }
+    }
+}
+
+static int init_tile_data(AV1DecContext *s)
+
+{
+    int cur_tile_num =
+        s->raw_frame_header->tile_cols * s->raw_frame_header->tile_rows;
+    if (s->tile_num < cur_tile_num) {
+        int ret = av_reallocp_array(&s->tile_group_info, cur_tile_num,
+                                    sizeof(TileGroupInfo));
+        if (ret < 0) {
+            s->tile_num = 0;
+            return ret;
+        }
+    }
+    s->tile_num = cur_tile_num;
+
+    return 0;
+}
+
+static int get_tiles_info(AVCodecContext *avctx, const AV1RawTileGroup *tile_group)
+{
+    AV1DecContext *s = avctx->priv_data;
+    GetBitContext gb;
+    uint16_t tile_num, tile_row, tile_col;
+    uint32_t size = 0, size_bytes = 0, offset = 0;
+    int ret;
+
+    if ((ret = init_get_bits8(&gb,
+                              tile_group->tile_data.data,
+                              tile_group->tile_data.data_size)) < 0) {
+        av_log(avctx, AV_LOG_ERROR, "Failed to initialize bitstream reader.\n");
+        return ret;
+    }
+
+    s->tg_start = tile_group->tg_start;
+    s->tg_end = tile_group->tg_end;
+
+    for (tile_num = tile_group->tg_start; tile_num <= tile_group->tg_end; tile_num++) {
+        tile_row = tile_num / s->raw_frame_header->tile_cols;
+        tile_col = tile_num % s->raw_frame_header->tile_cols;
+
+        if (tile_num == tile_group->tg_end) {
+            s->tile_group_info[tile_num].tile_size = get_bits_left(&gb) / 8;
+            s->tile_group_info[tile_num].tile_offset = offset;
+            s->tile_group_info[tile_num].tile_row = tile_row;
+            s->tile_group_info[tile_num].tile_column = tile_col;
+            return 0;
+        }
+        size_bytes = s->raw_frame_header->tile_size_bytes_minus1 + 1;
+        size = get_bits_le(&gb, size_bytes * 8) + 1;
+        skip_bits(&gb, size * 8);
+
+        offset += size_bytes;
+
+        s->tile_group_info[tile_num].tile_size = size;
+        s->tile_group_info[tile_num].tile_offset = offset;
+        s->tile_group_info[tile_num].tile_row = tile_row;
+        s->tile_group_info[tile_num].tile_column = tile_col;
+
+        offset += size;
+    }
+
+    return 0;
+
+}
+
+static int get_pixel_format(AVCodecContext *avctx)
+{
+    AV1DecContext *s = avctx->priv_data;
+    const AV1RawSequenceHeader *seq = s->raw_seq;
+    uint8_t bit_depth;
+    int ret;
+    enum AVPixelFormat pix_fmt = AV_PIX_FMT_NONE;
+#define HWACCEL_MAX (0)
+    enum AVPixelFormat pix_fmts[HWACCEL_MAX + 1], *fmtp = pix_fmts;
+
+    /**
+     * check if the HW accel is inited correctly. If not, return un-implemented.
+     * Since now the av1 decoder doesn't support native decode, if it will be
+     * implemented in the future, need remove this check.
+     */
+    if (!avctx->hwaccel) {
+        av_log(avctx, AV_LOG_ERROR, "Your platform doesn't suppport"
+               " hardware accelerated AV1 decoding.\n");
+        return AVERROR(ENOSYS);
+    }
+
+    if (seq->seq_profile == 2 && seq->color_config.high_bitdepth)
+        bit_depth = seq->color_config.twelve_bit ? 12 : 10;
+    else if (seq->seq_profile <= 2)
+        bit_depth = seq->color_config.high_bitdepth ? 10 : 8;
+    else {
+        av_log(avctx, AV_LOG_ERROR,
+               "Unknown AV1 profile %d.\n", seq->seq_profile);
+        return -1;
+    }
+
+    if (!seq->color_config.mono_chrome) {
+        // 4:4:4 x:0 y:0, 4:2:2 x:1 y:0, 4:2:0 x:1 y:1
+        if (seq->color_config.subsampling_x == 0 &&
+            seq->color_config.subsampling_y == 0) {
+            if (bit_depth == 8)
+                pix_fmt = AV_PIX_FMT_YUV444P;
+            else if (bit_depth == 10)
+                pix_fmt = AV_PIX_FMT_YUV444P10;
+            else if (bit_depth == 12)
+                pix_fmt = AV_PIX_FMT_YUV444P12;
+            else
+                av_log(avctx, AV_LOG_WARNING, "Unknown AV1 pixel format.\n");
+        } else if (seq->color_config.subsampling_x == 1 &&
+                   seq->color_config.subsampling_y == 0) {
+            if (bit_depth == 8)
+                pix_fmt = AV_PIX_FMT_YUV422P;
+            else if (bit_depth == 10)
+                pix_fmt = AV_PIX_FMT_YUV422P10;
+            else if (bit_depth == 12)
+                pix_fmt = AV_PIX_FMT_YUV422P12;
+            else
+                av_log(avctx, AV_LOG_WARNING, "Unknown AV1 pixel format.\n");
+        } else if (seq->color_config.subsampling_x == 1 &&
+                   seq->color_config.subsampling_y == 1) {
+            if (bit_depth == 8)
+                pix_fmt = AV_PIX_FMT_YUV420P;
+            else if (bit_depth == 10)
+                pix_fmt = AV_PIX_FMT_YUV420P10;
+            else if (bit_depth == 12)
+                pix_fmt = AV_PIX_FMT_YUV420P12;
+            else
+                av_log(avctx, AV_LOG_WARNING, "Unknown AV1 pixel format.\n");
+        }
+    } else {
+        if (seq->color_config.subsampling_x == 1 &&
+            seq->color_config.subsampling_y == 1)
+            pix_fmt = AV_PIX_FMT_YUV440P;
+        else
+            av_log(avctx, AV_LOG_WARNING, "Unknown AV1 pixel format.\n");
+    }
+
+    av_log(avctx, AV_LOG_DEBUG, "AV1 decode get format: %s.\n",
+           av_get_pix_fmt_name(pix_fmt));
+
+    if (pix_fmt == AV_PIX_FMT_NONE)
+        return -1;
+    s->pix_fmt = pix_fmt;
+
+    *fmtp = AV_PIX_FMT_NONE;
+    avctx->sw_pix_fmt = s->pix_fmt;
+    ret = ff_thread_get_format(avctx, pix_fmts);
+    if (ret < 0)
+        return ret;
+
+    avctx->pix_fmt = ret;
+
+    return 0;
+}
+
+static void av1_frame_unref(AVCodecContext *avctx, AV1Frame *f)
+{
+    ff_thread_release_buffer(avctx, &f->tf);
+    av_buffer_unref(&f->hwaccel_priv_buf);
+    f->hwaccel_picture_private = NULL;
+}
+
+static int av1_frame_ref(AVCodecContext *avctx, AV1Frame *dst, const AV1Frame *src)
+{
+    int ret;
+
+    ret = ff_thread_ref_frame(&dst->tf, &src->tf);
+    if (ret < 0)
+        return ret;
+
+    if (src->hwaccel_picture_private) {
+        dst->hwaccel_priv_buf = av_buffer_ref(src->hwaccel_priv_buf);
+        if (!dst->hwaccel_priv_buf)
+            goto fail;
+        dst->hwaccel_picture_private = dst->hwaccel_priv_buf->data;
+    }
+
+    dst->loop_filter_delta_enabled = src->loop_filter_delta_enabled;
+    memcpy(dst->loop_filter_ref_deltas,
+           src->loop_filter_ref_deltas,
+           AV1_NUM_REF_FRAMES * sizeof(int8_t));
+    memcpy(dst->loop_filter_mode_deltas,
+           src->loop_filter_mode_deltas,
+           2 * sizeof(int8_t));
+    memcpy(dst->gm_type,
+           src->gm_type,
+           AV1_NUM_REF_FRAMES * sizeof(uint8_t));
+    memcpy(dst->gm_params,
+           src->gm_params,
+           AV1_NUM_REF_FRAMES * 6 * sizeof(int32_t));
+
+    return 0;
+
+fail:
+    av1_frame_unref(avctx, dst);
+    return AVERROR(ENOMEM);
+}
+
+static av_cold int av1_decode_free(AVCodecContext *avctx)
+{
+    AV1DecContext *s = avctx->priv_data;
+
+    for (int i = 0; i < FF_ARRAY_ELEMS(s->ref); i++) {
+        if (s->ref[i].tf.f->buf[0])
+            av1_frame_unref(avctx, &s->ref[i]);
+        av_frame_free(&s->ref[i].tf.f);
+    }
+    if (s->cur_frame.tf.f->buf[0])
+        av1_frame_unref(avctx, &s->cur_frame);
+    av_frame_free(&s->cur_frame.tf.f);
+
+    av_buffer_unref(&s->seq_ref);
+    av_buffer_unref(&s->header_ref);
+    av_freep(&s->tile_group_info);
+
+    ff_cbs_fragment_free(&s->current_obu);
+    ff_cbs_close(&s->cbc);
+
+    return 0;
+}
+
+static int set_context_with_sequence(AVCodecContext *avctx,
+                                     const AV1RawSequenceHeader *seq)
+{
+    avctx->profile = seq->seq_profile;
+    avctx->level = seq->seq_level_idx[0];
+
+    avctx->color_range =
+        seq->color_config.color_range ? AVCOL_RANGE_JPEG : AVCOL_RANGE_MPEG;
+    avctx->color_primaries = seq->color_config.color_primaries;
+    avctx->colorspace = seq->color_config.color_primaries;
+    avctx->color_trc = seq->color_config.transfer_characteristics;
+
+    if (seq->timing_info.num_units_in_display_tick &&
+        seq->timing_info.time_scale) {
+        av_reduce(&avctx->framerate.den, &avctx->framerate.num,
+                  seq->timing_info.num_units_in_display_tick,
+                  seq->timing_info.time_scale,
+                  INT_MAX);
+        if (seq->timing_info.equal_picture_interval)
+            avctx->ticks_per_frame = seq->timing_info.num_ticks_per_picture_minus_1 + 1;
+    }
+
+    return 0;
+}
+
+static int update_context_with_frame_header(AVCodecContext *avctx,
+                                            const AV1RawFrameHeader *header)
+{
+    AVRational aspect_ratio;
+    int width = header->frame_width_minus_1 + 1;
+    int height = header->frame_height_minus_1 + 1;
+    int r_width = header->render_width_minus_1 + 1;
+    int r_height = header->render_height_minus_1 + 1;
+    int ret;
+
+    if (avctx->width != width || avctx->height != height) {
+        ret = ff_set_dimensions(avctx, width, height);
+        if (ret < 0)
+            return ret;
+    }
+
+    av_reduce(&aspect_ratio.num, &aspect_ratio.den,
+              (int64_t)height * r_width,
+              (int64_t)width * r_height,
+              INT_MAX);
+
+    if (avctx->sample_aspect_ratio.num != aspect_ratio.num ||
+        avctx->sample_aspect_ratio.den != aspect_ratio.den) {
+        ret = ff_set_sar(avctx, aspect_ratio);
+        if (ret < 0)
+            return ret;
+    }
+
+    return 0;
+}
+
+static av_cold int av1_decode_init(AVCodecContext *avctx)
+{
+    AV1DecContext *s = avctx->priv_data;
+    AV1RawSequenceHeader *seq;
+    int ret;
+
+    s->avctx = avctx;
+    s->pix_fmt = AV_PIX_FMT_NONE;
+
+    for (int i = 0; i < FF_ARRAY_ELEMS(s->ref); i++) {
+        s->ref[i].tf.f = av_frame_alloc();
+        if (!s->ref[i].tf.f) {
+            av1_decode_free(avctx);
+            av_log(avctx, AV_LOG_ERROR,
+                   "Failed to allocate reference frame buffer %d.\n", i);
+            return AVERROR(ENOMEM);
+        }
+    }
+
+    s->cur_frame.tf.f = av_frame_alloc();
+    if (!s->cur_frame.tf.f) {
+        av1_decode_free(avctx);
+        av_log(avctx, AV_LOG_ERROR,
+               "Failed to allocate current frame buffer.\n");
+        return AVERROR(ENOMEM);
+    }
+
+    ret = ff_cbs_init(&s->cbc, AV_CODEC_ID_AV1, avctx);
+    if (ret < 0)
+        return ret;
+
+    if (avctx->extradata && avctx->extradata_size) {
+        ret = ff_cbs_read(s->cbc, &s->current_obu, avctx->extradata,
+                          avctx->extradata_size);
+        if (ret < 0) {
+            av_log(avctx, AV_LOG_WARNING, "Failed to read extradata.\n");
+            goto end;
+        }
+
+        seq = ((CodedBitstreamAV1Context *)(s->cbc->priv_data))->sequence_header;
+        if (!seq) {
+            av_log(avctx, AV_LOG_WARNING, "No sequence header available.\n");
+            goto end;
+        }
+
+        ret = set_context_with_sequence(avctx, seq);
+        if (ret < 0) {
+            av_log(avctx, AV_LOG_WARNING, "Failed to set decoder context.\n");
+            goto end;
+        }
+
+        end:
+        ff_cbs_fragment_reset(&s->current_obu);
+    }
+
+    return ret;
+}
+
+static int av1_frame_alloc(AVCodecContext *avctx, AV1Frame *f)
+{
+    AV1DecContext *s = avctx->priv_data;
+    AV1RawFrameHeader *header= s->raw_frame_header;
+    AVFrame *frame;
+    int ret;
+
+    ret = update_context_with_frame_header(avctx, header);
+    if (ret < 0) {
+        av_log(avctx, AV_LOG_ERROR, "Failed to update context with frame header\n");
+        return ret;
+    }
+
+    if ((ret = ff_thread_get_buffer(avctx, &f->tf, AV_GET_BUFFER_FLAG_REF)) < 0)
+        return ret;
+
+    frame = f->tf.f;
+    frame->key_frame = header->frame_type == AV1_FRAME_KEY;
+
+    switch (header->frame_type) {
+    case AV1_FRAME_KEY:
+    case AV1_FRAME_INTRA_ONLY:
+        frame->pict_type = AV_PICTURE_TYPE_I;
+        break;
+    case AV1_FRAME_INTER:
+        frame->pict_type = AV_PICTURE_TYPE_P;
+        break;
+    case AV1_FRAME_SWITCH:
+        frame->pict_type = AV_PICTURE_TYPE_SP;
+        break;
+    }
+
+    if (avctx->hwaccel) {
+        const AVHWAccel *hwaccel = avctx->hwaccel;
+        if (hwaccel->frame_priv_data_size) {
+            f->hwaccel_priv_buf =
+                av_buffer_allocz(hwaccel->frame_priv_data_size);
+            if (!f->hwaccel_priv_buf)
+                goto fail;
+            f->hwaccel_picture_private = f->hwaccel_priv_buf->data;
+        }
+    }
+    return 0;
+
+fail:
+    av1_frame_unref(avctx, f);
+    return AVERROR(ENOMEM);
+}
+
+static int set_output_frame(AVCodecContext *avctx, AVFrame *frame,
+                            const AVPacket *pkt, int *got_frame)
+{
+    AV1DecContext *s = avctx->priv_data;
+    const AV1RawFrameHeader *header = s->raw_frame_header;
+    const AVFrame *srcframe;
+    int ret;
+
+    if (header->show_existing_frame)
+        srcframe = s->ref[header->frame_to_show_map_idx].tf.f;
+    else
+        srcframe = s->cur_frame.tf.f;
+
+    ret = av_frame_ref(frame, srcframe);
+    if (ret < 0)
+        return ret;
+
+    frame->pts = pkt->pts;
+    frame->pkt_dts = pkt->dts;
+    frame->pkt_size = pkt->size;
+
+    *got_frame = 1;
+
+    return 0;
+}
+
+static int update_reference_list(AVCodecContext *avctx)
+{
+    AV1DecContext *s = avctx->priv_data;
+    const AV1RawFrameHeader *header = s->raw_frame_header;
+    int ret;
+
+    for (int i = 0; i < AV1_NUM_REF_FRAMES; i++) {
+        if (header->refresh_frame_flags & (1 << i)) {
+            if (s->ref[i].tf.f->buf[0])
+                av1_frame_unref(avctx, &s->ref[i]);
+            if ((ret = av1_frame_ref(avctx, &s->ref[i], &s->cur_frame)) < 0) {
+                av_log(avctx, AV_LOG_ERROR,
+                       "Failed to update frame %d in reference list\n", i);
+                return ret;
+            }
+        }
+    }
+    return 0;
+}
+
+static int get_current_frame(AVCodecContext *avctx)
+{
+    AV1DecContext *s = avctx->priv_data;
+    int ret;
+
+    if (s->cur_frame.tf.f->buf[0])
+        av1_frame_unref(avctx, &s->cur_frame);
+
+    ret = av1_frame_alloc(avctx, &s->cur_frame);
+    if (ret < 0) {
+        av_log(avctx, AV_LOG_ERROR,
+               "Failed to allocate space for current frame.\n");
+        return ret;
+    }
+
+    ret = init_tile_data(s);
+    if (ret < 0) {
+        av_log(avctx, AV_LOG_ERROR, "Failed to init tile data.\n");
+        return ret;
+    }
+
+    if (s->raw_frame_header->primary_ref_frame == AV1_PRIMARY_REF_NONE)
+        setup_past_independence(&s->cur_frame);
+    else
+        load_previous_and_update(s);
+
+    global_motion_params(s);
+
+    return ret;
+}
+
+static int av1_decode_frame(AVCodecContext *avctx, void *frame,
+                            int *got_frame, AVPacket *pkt)
+{
+    AV1DecContext *s = avctx->priv_data;
+    AV1RawTileGroup *raw_tile_group = NULL;
+    int ret;
+
+    ret = ff_cbs_read_packet(s->cbc, &s->current_obu, pkt);
+    if (ret < 0) {
+        av_log(avctx, AV_LOG_ERROR, "Failed to read packet.\n");
+        goto end;
+    }
+    av_log(avctx, AV_LOG_DEBUG, "Total obu for this frame:%d.\n",
+           s->current_obu.nb_units);
+
+    for (int i = 0; i < s->current_obu.nb_units; i++) {
+        CodedBitstreamUnit *unit = &s->current_obu.units[i];
+        AV1RawOBU *obu = unit->content;
+        av_log(avctx, AV_LOG_DEBUG, "Obu idx:%d, obu type:%d.\n", i, unit->type);
+
+        switch (unit->type) {
+        case AV1_OBU_SEQUENCE_HEADER:
+            av_buffer_unref(&s->seq_ref);
+            s->seq_ref = av_buffer_ref(unit->content_ref);
+            if (!s->seq_ref) {
+                ret = AVERROR(ENOMEM);
+                goto end;
+            }
+
+            s->raw_seq = &obu->obu.sequence_header;
+
+            ret = set_context_with_sequence(avctx, s->raw_seq);
+            if (ret < 0) {
+                av_log(avctx, AV_LOG_ERROR, "Failed to set context.\n");
+                goto end;
+            }
+
+            if (s->pix_fmt == AV_PIX_FMT_NONE) {
+                ret = get_pixel_format(avctx);
+                if (ret < 0) {
+                    av_log(avctx, AV_LOG_ERROR,
+                           "Failed to get pixel format.\n");
+                    goto end;
+                }
+            }
+
+            if (avctx->hwaccel && avctx->hwaccel->decode_params) {
+                ret = avctx->hwaccel->decode_params(avctx, unit->type, unit->data,
+                                                    unit->data_size);
+                if (ret < 0) {
+                    av_log(avctx, AV_LOG_ERROR, "HW accel decode params fail.\n");
+                    goto end;
+                }
+            }
+            break;
+        case AV1_OBU_REDUNDANT_FRAME_HEADER:
+            if (s->raw_frame_header)
+                break;
+        // fall-through
+        case AV1_OBU_FRAME:
+        case AV1_OBU_FRAME_HEADER:
+            if (!s->seq_ref) {
+                av_log(avctx, AV_LOG_ERROR, "Missing Sequence Header.\n");
+                ret = AVERROR_INVALIDDATA;
+                goto end;
+            }
+
+            av_buffer_unref(&s->header_ref);
+            s->header_ref = av_buffer_ref(unit->content_ref);
+            if (!s->header_ref) {
+                ret = AVERROR(ENOMEM);
+                goto end;
+            }
+
+            if (unit->type == AV1_OBU_FRAME)
+                s->raw_frame_header = &obu->obu.frame.header;
+            else
+                s->raw_frame_header = &obu->obu.frame_header;
+
+            if (s->raw_frame_header->show_existing_frame) {
+                ret = set_output_frame(avctx, frame, pkt, got_frame);
+                if (ret < 0)
+                    av_log(avctx, AV_LOG_ERROR, "Set output frame error.\n");
+
+                s->raw_frame_header = NULL;
+
+                goto end;
+            }
+
+            ret = get_current_frame(avctx);
+            if (ret < 0) {
+                av_log(avctx, AV_LOG_ERROR, "Get current frame error\n");
+                goto end;
+            }
+
+            if (avctx->hwaccel) {
+                ret = avctx->hwaccel->start_frame(avctx, unit->data,
+                                                  unit->data_size);
+                if (ret < 0) {
+                    av_log(avctx, AV_LOG_ERROR, "HW accel start frame fail.\n");
+                    goto end;
+                }
+            }
+            if (unit->type != AV1_OBU_FRAME)
+                break;
+        // fall-through
+        case AV1_OBU_TILE_GROUP:
+            if (!s->raw_frame_header) {
+                av_log(avctx, AV_LOG_ERROR, "Missing Frame Header.\n");
+                ret = AVERROR_INVALIDDATA;
+                goto end;
+            }
+
+            if (unit->type == AV1_OBU_FRAME)
+                raw_tile_group = &obu->obu.frame.tile_group;
+            else
+                raw_tile_group = &obu->obu.tile_group;
+
+            get_tiles_info(avctx, raw_tile_group);
+
+            if (avctx->hwaccel) {
+                ret = avctx->hwaccel->decode_slice(avctx,
+                                                   raw_tile_group->tile_data.data,
+                                                   raw_tile_group->tile_data.data_size);
+                if (ret < 0) {
+                    av_log(avctx, AV_LOG_ERROR,
+                           "HW accel decode slice fail.\n");
+                    goto end;
+                }
+            }
+            break;
+        case AV1_OBU_TILE_LIST:
+        case AV1_OBU_TEMPORAL_DELIMITER:
+        case AV1_OBU_PADDING:
+        case AV1_OBU_METADATA:
+            break;
+        default:
+            av_log(avctx, AV_LOG_DEBUG,
+                   "Unknown obu type: %d (%"SIZE_SPECIFIER" bits).\n",
+                   unit->type, unit->data_size);
+        }
+
+        if (raw_tile_group && (s->tile_num == raw_tile_group->tg_end + 1)) {
+            if (avctx->hwaccel) {
+                ret = avctx->hwaccel->end_frame(avctx);
+                if (ret < 0) {
+                    av_log(avctx, AV_LOG_ERROR, "HW accel end frame fail.\n");
+                    goto end;
+                }
+            }
+
+            ret = update_reference_list(avctx);
+            if (ret < 0) {
+                av_log(avctx, AV_LOG_ERROR, "Failed to update reference list.\n");
+                goto end;
+            }
+
+            if (s->raw_frame_header->show_frame) {
+                ret = set_output_frame(avctx, frame, pkt, got_frame);
+                if (ret < 0) {
+                    av_log(avctx, AV_LOG_ERROR, "Set output frame error\n");
+                    goto end;
+                }
+            }
+            raw_tile_group = NULL;
+            s->raw_frame_header = NULL;
+        }
+    }
+
+end:
+    ff_cbs_fragment_reset(&s->current_obu);
+    return ret;
+}
+
+static void av1_decode_flush(AVCodecContext *avctx)
+{
+    AV1DecContext *s = avctx->priv_data;
+
+    for (int i = 0; i < FF_ARRAY_ELEMS(s->ref); i++)
+        av1_frame_unref(avctx, &s->ref[i]);
+
+    av1_frame_unref(avctx, &s->cur_frame);
+    s->raw_frame_header = NULL;
+    s->raw_seq = NULL;
+}
+
+AVCodec ff_av1_decoder = {
+    .name                  = "av1",
+    .long_name             = NULL_IF_CONFIG_SMALL("Alliance for Open Media AV1"),
+    .type                  = AVMEDIA_TYPE_VIDEO,
+    .id                    = AV_CODEC_ID_AV1,
+    .priv_data_size        = sizeof(AV1DecContext),
+    .init                  = av1_decode_init,
+    .close                 = av1_decode_free,
+    .decode                = av1_decode_frame,
+    .capabilities          = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_AVOID_PROBING,
+    .caps_internal         = FF_CODEC_CAP_INIT_THREADSAFE |
+                             FF_CODEC_CAP_INIT_CLEANUP |
+                             FF_CODEC_CAP_SETS_PKT_DTS,
+    .flush                 = av1_decode_flush,
+    .profiles              = NULL_IF_CONFIG_SMALL(ff_av1_profiles),
+    .hw_configs            = (const AVCodecHWConfigInternal * []) {
+        NULL
+    },
+};