Merge commit '43778a501f1bfbceeddc8eaeea2ea2b3506beeda'

* commit '43778a501f1bfbceeddc8eaeea2ea2b3506beeda':
  Support AV1 encoding using libaom

This contains some extra changes taken from the libvpx encoder
wrapper, most of them contained in the set_pix_fmt() function.

Merged-by: James Almer <jamrial@gmail.com>

1 files changed, 742 insertions, 0 deletions

diff --git a/libavcodec/libaomenc.c b/libavcodec/libaomenc.c
new file mode 100644
index 0000000000..a80bcbf522
--- /dev/null
+++ b/libavcodec/libaomenc.c
@@ -0,0 +1,742 @@
+/*
+ * Copyright (c) 2010, Google, Inc.
+ *
+ * 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
+ */
+
+/**
+ * @file
+ * AV1 encoder support via libaom
+ */
+
+#define AOM_DISABLE_CTRL_TYPECHECKS 1
+#include <aom/aom_encoder.h>
+#include <aom/aomcx.h>
+
+#include "libavutil/base64.h"
+#include "libavutil/common.h"
+#include "libavutil/mathematics.h"
+#include "libavutil/opt.h"
+#include "libavutil/pixdesc.h"
+
+#include "avcodec.h"
+#include "internal.h"
+
+/*
+ * Portion of struct aom_codec_cx_pkt from aom_encoder.h.
+ * One encoded frame returned from the library.
+ */
+struct FrameListData {
+    void *buf;                       /**< compressed data buffer */
+    size_t sz;                       /**< length of compressed data */
+    int64_t pts;                     /**< time stamp to show frame
+                                          (in timebase units) */
+    unsigned long duration;          /**< duration to show frame
+                                          (in timebase units) */
+    uint32_t flags;                  /**< flags for this frame */
+    struct FrameListData *next;
+};
+
+typedef struct AOMEncoderContext {
+    AVClass *class;
+    struct aom_codec_ctx encoder;
+    struct aom_image rawimg;
+    struct aom_fixed_buf twopass_stats;
+    struct FrameListData *coded_frame_list;
+    int cpu_used;
+    int auto_alt_ref;
+    int lag_in_frames;
+    int error_resilient;
+    int crf;
+    int static_thresh;
+    int drop_threshold;
+    int noise_sensitivity;
+} AOMContext;
+
+static const char *const ctlidstr[] = {
+    [AOME_SET_CPUUSED]          = "AOME_SET_CPUUSED",
+    [AOME_SET_CQ_LEVEL]         = "AOME_SET_CQ_LEVEL",
+    [AOME_SET_ENABLEAUTOALTREF] = "AOME_SET_ENABLEAUTOALTREF",
+    [AOME_SET_STATIC_THRESHOLD] = "AOME_SET_STATIC_THRESHOLD",
+    [AV1E_SET_COLOR_RANGE]      = "AV1E_SET_COLOR_RANGE",
+};
+
+static av_cold void log_encoder_error(AVCodecContext *avctx, const char *desc)
+{
+    AOMContext *ctx    = avctx->priv_data;
+    const char *error  = aom_codec_error(&ctx->encoder);
+    const char *detail = aom_codec_error_detail(&ctx->encoder);
+
+    av_log(avctx, AV_LOG_ERROR, "%s: %s\n", desc, error);
+    if (detail)
+        av_log(avctx, AV_LOG_ERROR, "  Additional information: %s\n", detail);
+}
+
+static av_cold void dump_enc_cfg(AVCodecContext *avctx,
+                                 const struct aom_codec_enc_cfg *cfg)
+{
+    int width = -30;
+    int level = AV_LOG_DEBUG;
+
+    av_log(avctx, level, "aom_codec_enc_cfg\n");
+    av_log(avctx, level, "generic settings\n"
+                         "  %*s%u\n  %*s%u\n  %*s%u\n  %*s%u\n  %*s%u\n"
+                         "  %*s%u\n  %*s%u\n"
+                         "  %*s{%u/%u}\n  %*s%u\n  %*s%d\n  %*s%u\n",
+           width, "g_usage:",           cfg->g_usage,
+           width, "g_threads:",         cfg->g_threads,
+           width, "g_profile:",         cfg->g_profile,
+           width, "g_w:",               cfg->g_w,
+           width, "g_h:",               cfg->g_h,
+           width, "g_bit_depth:",       cfg->g_bit_depth,
+           width, "g_input_bit_depth:", cfg->g_input_bit_depth,
+           width, "g_timebase:",        cfg->g_timebase.num, cfg->g_timebase.den,
+           width, "g_error_resilient:", cfg->g_error_resilient,
+           width, "g_pass:",            cfg->g_pass,
+           width, "g_lag_in_frames:",   cfg->g_lag_in_frames);
+    av_log(avctx, level, "rate control settings\n"
+                         "  %*s%u\n  %*s%d\n  %*s%p("SIZE_SPECIFIER")\n  %*s%u\n",
+           width, "rc_dropframe_thresh:", cfg->rc_dropframe_thresh,
+           width, "rc_end_usage:",        cfg->rc_end_usage,
+           width, "rc_twopass_stats_in:", cfg->rc_twopass_stats_in.buf, cfg->rc_twopass_stats_in.sz,
+           width, "rc_target_bitrate:",   cfg->rc_target_bitrate);
+    av_log(avctx, level, "quantizer settings\n"
+                         "  %*s%u\n  %*s%u\n",
+           width, "rc_min_quantizer:", cfg->rc_min_quantizer,
+           width, "rc_max_quantizer:", cfg->rc_max_quantizer);
+    av_log(avctx, level, "bitrate tolerance\n"
+                         "  %*s%u\n  %*s%u\n",
+           width, "rc_undershoot_pct:", cfg->rc_undershoot_pct,
+           width, "rc_overshoot_pct:",  cfg->rc_overshoot_pct);
+    av_log(avctx, level, "decoder buffer model\n"
+                         "  %*s%u\n  %*s%u\n  %*s%u\n",
+           width, "rc_buf_sz:",         cfg->rc_buf_sz,
+           width, "rc_buf_initial_sz:", cfg->rc_buf_initial_sz,
+           width, "rc_buf_optimal_sz:", cfg->rc_buf_optimal_sz);
+    av_log(avctx, level, "2 pass rate control settings\n"
+                         "  %*s%u\n  %*s%u\n  %*s%u\n",
+           width, "rc_2pass_vbr_bias_pct:",       cfg->rc_2pass_vbr_bias_pct,
+           width, "rc_2pass_vbr_minsection_pct:", cfg->rc_2pass_vbr_minsection_pct,
+           width, "rc_2pass_vbr_maxsection_pct:", cfg->rc_2pass_vbr_maxsection_pct);
+    av_log(avctx, level, "keyframing settings\n"
+                         "  %*s%d\n  %*s%u\n  %*s%u\n",
+           width, "kf_mode:",     cfg->kf_mode,
+           width, "kf_min_dist:", cfg->kf_min_dist,
+           width, "kf_max_dist:", cfg->kf_max_dist);
+    av_log(avctx, level, "\n");
+}
+
+static void coded_frame_add(void *list, struct FrameListData *cx_frame)
+{
+    struct FrameListData **p = list;
+
+    while (*p)
+        p = &(*p)->next;
+    *p = cx_frame;
+    cx_frame->next = NULL;
+}
+
+static av_cold void free_coded_frame(struct FrameListData *cx_frame)
+{
+    av_freep(&cx_frame->buf);
+    av_freep(&cx_frame);
+}
+
+static av_cold void free_frame_list(struct FrameListData *list)
+{
+    struct FrameListData *p = list;
+
+    while (p) {
+        list = list->next;
+        free_coded_frame(p);
+        p = list;
+    }
+}
+
+static av_cold int codecctl_int(AVCodecContext *avctx,
+                                enum aome_enc_control_id id, int val)
+{
+    AOMContext *ctx = avctx->priv_data;
+    char buf[80];
+    int width = -30;
+    int res;
+
+    snprintf(buf, sizeof(buf), "%s:", ctlidstr[id]);
+    av_log(avctx, AV_LOG_DEBUG, "  %*s%d\n", width, buf, val);
+
+    res = aom_codec_control(&ctx->encoder, id, val);
+    if (res != AOM_CODEC_OK) {
+        snprintf(buf, sizeof(buf), "Failed to set %s codec control",
+                 ctlidstr[id]);
+        log_encoder_error(avctx, buf);
+        return AVERROR(EINVAL);
+    }
+
+    return 0;
+}
+
+static av_cold int aom_free(AVCodecContext *avctx)
+{
+    AOMContext *ctx = avctx->priv_data;
+
+    aom_codec_destroy(&ctx->encoder);
+    av_freep(&ctx->twopass_stats.buf);
+    av_freep(&avctx->stats_out);
+    free_frame_list(ctx->coded_frame_list);
+    return 0;
+}
+
+static int set_pix_fmt(AVCodecContext *avctx, aom_codec_caps_t codec_caps,
+                       struct aom_codec_enc_cfg *enccfg, aom_codec_flags_t *flags,
+                       aom_img_fmt_t *img_fmt)
+{
+    AOMContext av_unused *ctx = avctx->priv_data;
+    enccfg->g_bit_depth = enccfg->g_input_bit_depth = 8;
+    switch (avctx->pix_fmt) {
+    case AV_PIX_FMT_YUV420P:
+        enccfg->g_profile = FF_PROFILE_AV1_MAIN;
+        *img_fmt = AOM_IMG_FMT_I420;
+        return 0;
+    case AV_PIX_FMT_YUV422P:
+        enccfg->g_profile = FF_PROFILE_AV1_PROFESSIONAL;
+        *img_fmt = AOM_IMG_FMT_I422;
+        return 0;
+    case AV_PIX_FMT_GBRP:
+    case AV_PIX_FMT_YUV444P:
+        enccfg->g_profile = FF_PROFILE_AV1_HIGH;
+        *img_fmt = AOM_IMG_FMT_I444;
+        return 0;
+    case AV_PIX_FMT_YUV420P10:
+    case AV_PIX_FMT_YUV420P12:
+        if (codec_caps & AOM_CODEC_CAP_HIGHBITDEPTH) {
+            enccfg->g_bit_depth = enccfg->g_input_bit_depth =
+                avctx->pix_fmt == AV_PIX_FMT_YUV420P10 ? 10 : 12;
+            enccfg->g_profile =
+                enccfg->g_bit_depth == 10 ? FF_PROFILE_AV1_MAIN : FF_PROFILE_AV1_PROFESSIONAL;
+            *img_fmt = AOM_IMG_FMT_I42016;
+            *flags |= AOM_CODEC_USE_HIGHBITDEPTH;
+            return 0;
+        }
+        break;
+    case AV_PIX_FMT_YUV422P10:
+    case AV_PIX_FMT_YUV422P12:
+        if (codec_caps & AOM_CODEC_CAP_HIGHBITDEPTH) {
+            enccfg->g_bit_depth = enccfg->g_input_bit_depth =
+                avctx->pix_fmt == AV_PIX_FMT_YUV422P10 ? 10 : 12;
+            enccfg->g_profile = FF_PROFILE_AV1_PROFESSIONAL;
+            *img_fmt = AOM_IMG_FMT_I42216;
+            *flags |= AOM_CODEC_USE_HIGHBITDEPTH;
+            return 0;
+        }
+        break;
+    case AV_PIX_FMT_GBRP10:
+    case AV_PIX_FMT_GBRP12:
+    case AV_PIX_FMT_YUV444P10:
+    case AV_PIX_FMT_YUV444P12:
+        if (codec_caps & AOM_CODEC_CAP_HIGHBITDEPTH) {
+            enccfg->g_bit_depth = enccfg->g_input_bit_depth =
+                avctx->pix_fmt == AV_PIX_FMT_YUV444P10 ||
+                avctx->pix_fmt == AV_PIX_FMT_GBRP10 ? 10 : 12;
+            enccfg->g_profile =
+                enccfg->g_bit_depth == 10 ? FF_PROFILE_AV1_HIGH : FF_PROFILE_AV1_PROFESSIONAL;
+            *img_fmt = AOM_IMG_FMT_I44416;
+            *flags |= AOM_CODEC_USE_HIGHBITDEPTH;
+            return 0;
+        }
+        break;
+    default:
+        break;
+    }
+    av_log(avctx, AV_LOG_ERROR, "Unsupported pixel format.\n");
+    return AVERROR_INVALIDDATA;
+}
+
+static void set_color_range(AVCodecContext *avctx)
+{
+    enum aom_color_range aom_cr;
+    switch (avctx->color_range) {
+    case AVCOL_RANGE_UNSPECIFIED:
+    case AVCOL_RANGE_MPEG:       aom_cr = AOM_CR_STUDIO_RANGE; break;
+    case AVCOL_RANGE_JPEG:       aom_cr = AOM_CR_FULL_RANGE;   break;
+    default:
+        av_log(avctx, AV_LOG_WARNING, "Unsupported color range (%d)\n",
+               avctx->color_range);
+        return;
+    }
+
+    codecctl_int(avctx, AV1E_SET_COLOR_RANGE, aom_cr);
+}
+
+static av_cold int aom_init(AVCodecContext *avctx,
+                            const struct aom_codec_iface *iface)
+{
+    AOMContext *ctx = avctx->priv_data;
+    struct aom_codec_enc_cfg enccfg = { 0 };
+    aom_codec_flags_t flags = 0;
+    AVCPBProperties *cpb_props;
+    int res;
+    aom_img_fmt_t img_fmt;
+    aom_codec_caps_t codec_caps = aom_codec_get_caps(iface);
+
+    av_log(avctx, AV_LOG_INFO, "%s\n", aom_codec_version_str());
+    av_log(avctx, AV_LOG_VERBOSE, "%s\n", aom_codec_build_config());
+
+    if ((res = aom_codec_enc_config_default(iface, &enccfg, 0)) != AOM_CODEC_OK) {
+        av_log(avctx, AV_LOG_ERROR, "Failed to get config: %s\n",
+               aom_codec_err_to_string(res));
+        return AVERROR(EINVAL);
+    }
+
+    if (set_pix_fmt(avctx, codec_caps, &enccfg, &flags, &img_fmt))
+        return AVERROR(EINVAL);
+
+    if(!avctx->bit_rate)
+        if(avctx->rc_max_rate || avctx->rc_buffer_size || avctx->rc_initial_buffer_occupancy) {
+            av_log( avctx, AV_LOG_ERROR, "Rate control parameters set without a bitrate\n");
+            return AVERROR(EINVAL);
+        }
+
+    dump_enc_cfg(avctx, &enccfg);
+
+    enccfg.g_w            = avctx->width;
+    enccfg.g_h            = avctx->height;
+    enccfg.g_timebase.num = avctx->time_base.num;
+    enccfg.g_timebase.den = avctx->time_base.den;
+    enccfg.g_threads      = avctx->thread_count;
+
+    if (ctx->lag_in_frames >= 0)
+        enccfg.g_lag_in_frames = ctx->lag_in_frames;
+
+    if (avctx->flags & AV_CODEC_FLAG_PASS1)
+        enccfg.g_pass = AOM_RC_FIRST_PASS;
+    else if (avctx->flags & AV_CODEC_FLAG_PASS2)
+        enccfg.g_pass = AOM_RC_LAST_PASS;
+    else
+        enccfg.g_pass = AOM_RC_ONE_PASS;
+
+    if (avctx->rc_min_rate == avctx->rc_max_rate &&
+        avctx->rc_min_rate == avctx->bit_rate && avctx->bit_rate) {
+        enccfg.rc_end_usage = AOM_CBR;
+    } else if (ctx->crf >= 0) {
+        enccfg.rc_end_usage = AOM_CQ;
+        if (!avctx->bit_rate)
+            enccfg.rc_end_usage = AOM_Q;
+    }
+
+    if (avctx->bit_rate) {
+        enccfg.rc_target_bitrate = av_rescale_rnd(avctx->bit_rate, 1, 1000,
+                                                  AV_ROUND_NEAR_INF);
+    } else if (enccfg.rc_end_usage == AOM_Q) {
+    } else {
+        if (enccfg.rc_end_usage == AOM_CQ) {
+            enccfg.rc_target_bitrate = 1000000;
+        } else {
+            avctx->bit_rate = enccfg.rc_target_bitrate * 1000;
+            av_log(avctx, AV_LOG_WARNING,
+                   "Neither bitrate nor constrained quality specified, using default bitrate of %dkbit/sec\n",
+                   enccfg.rc_target_bitrate);
+        }
+    }
+
+    if (avctx->qmin >= 0)
+        enccfg.rc_min_quantizer = avctx->qmin;
+    if (avctx->qmax >= 0)
+        enccfg.rc_max_quantizer = avctx->qmax;
+
+    if (enccfg.rc_end_usage == AOM_CQ || enccfg.rc_end_usage == AOM_Q
+       ) {
+        if (ctx->crf < enccfg.rc_min_quantizer || ctx->crf > enccfg.rc_max_quantizer) {
+            av_log(avctx, AV_LOG_ERROR,
+                   "CQ level %d must be between minimum and maximum quantizer value (%d-%d)\n",
+                   ctx->crf, enccfg.rc_min_quantizer, enccfg.rc_max_quantizer);
+            return AVERROR(EINVAL);
+        }
+    }
+
+    enccfg.rc_dropframe_thresh = ctx->drop_threshold;
+
+    // 0-100 (0 => CBR, 100 => VBR)
+    enccfg.rc_2pass_vbr_bias_pct       = round(avctx->qcompress * 100);
+    if (avctx->bit_rate)
+        enccfg.rc_2pass_vbr_minsection_pct =
+            avctx->rc_min_rate * 100LL / avctx->bit_rate;
+    if (avctx->rc_max_rate)
+        enccfg.rc_2pass_vbr_maxsection_pct =
+            avctx->rc_max_rate * 100LL / avctx->bit_rate;
+
+    if (avctx->rc_buffer_size)
+        enccfg.rc_buf_sz =
+            avctx->rc_buffer_size * 1000LL / avctx->bit_rate;
+    if (avctx->rc_initial_buffer_occupancy)
+        enccfg.rc_buf_initial_sz =
+            avctx->rc_initial_buffer_occupancy * 1000LL / avctx->bit_rate;
+    enccfg.rc_buf_optimal_sz = enccfg.rc_buf_sz * 5 / 6;
+
+    // _enc_init() will balk if kf_min_dist differs from max w/AOM_KF_AUTO
+    if (avctx->keyint_min >= 0 && avctx->keyint_min == avctx->gop_size)
+        enccfg.kf_min_dist = avctx->keyint_min;
+    if (avctx->gop_size >= 0)
+        enccfg.kf_max_dist = avctx->gop_size;
+
+    if (enccfg.g_pass == AOM_RC_FIRST_PASS)
+        enccfg.g_lag_in_frames = 0;
+    else if (enccfg.g_pass == AOM_RC_LAST_PASS) {
+        int decode_size, ret;
+
+        if (!avctx->stats_in) {
+            av_log(avctx, AV_LOG_ERROR, "No stats file for second pass\n");
+            return AVERROR_INVALIDDATA;
+        }
+
+        ctx->twopass_stats.sz = strlen(avctx->stats_in) * 3 / 4;
+        ret                   = av_reallocp(&ctx->twopass_stats.buf, ctx->twopass_stats.sz);
+        if (ret < 0) {
+            av_log(avctx, AV_LOG_ERROR,
+                   "Stat buffer alloc (%"SIZE_SPECIFIER" bytes) failed\n",
+                   ctx->twopass_stats.sz);
+            ctx->twopass_stats.sz = 0;
+            return ret;
+        }
+        decode_size = av_base64_decode(ctx->twopass_stats.buf, avctx->stats_in,
+                                       ctx->twopass_stats.sz);
+        if (decode_size < 0) {
+            av_log(avctx, AV_LOG_ERROR, "Stat buffer decode failed\n");
+            return AVERROR_INVALIDDATA;
+        }
+
+        ctx->twopass_stats.sz      = decode_size;
+        enccfg.rc_twopass_stats_in = ctx->twopass_stats;
+    }
+
+    /* 0-3: For non-zero values the encoder increasingly optimizes for reduced
+     * complexity playback on low powered devices at the expense of encode
+     * quality. */
+    if (avctx->profile != FF_PROFILE_UNKNOWN)
+        enccfg.g_profile = avctx->profile;
+
+    enccfg.g_error_resilient = ctx->error_resilient;
+
+    dump_enc_cfg(avctx, &enccfg);
+    /* Construct Encoder Context */
+    res = aom_codec_enc_init(&ctx->encoder, iface, &enccfg, flags);
+    if (res != AOM_CODEC_OK) {
+        log_encoder_error(avctx, "Failed to initialize encoder");
+        return AVERROR(EINVAL);
+    }
+
+    // codec control failures are currently treated only as warnings
+    av_log(avctx, AV_LOG_DEBUG, "aom_codec_control\n");
+    codecctl_int(avctx, AOME_SET_CPUUSED, ctx->cpu_used);
+    if (ctx->auto_alt_ref >= 0)
+        codecctl_int(avctx, AOME_SET_ENABLEAUTOALTREF, ctx->auto_alt_ref);
+
+    codecctl_int(avctx, AOME_SET_STATIC_THRESHOLD, ctx->static_thresh);
+    if (ctx->crf >= 0)
+        codecctl_int(avctx, AOME_SET_CQ_LEVEL,          ctx->crf);
+
+    set_color_range(avctx);
+
+    // provide dummy value to initialize wrapper, values will be updated each _encode()
+    aom_img_wrap(&ctx->rawimg, img_fmt, avctx->width, avctx->height, 1,
+                 (unsigned char*)1);
+
+    if (codec_caps & AOM_CODEC_CAP_HIGHBITDEPTH)
+        ctx->rawimg.bit_depth = enccfg.g_bit_depth;
+
+    cpb_props = ff_add_cpb_side_data(avctx);
+    if (!cpb_props)
+        return AVERROR(ENOMEM);
+
+    if (enccfg.rc_end_usage == AOM_CBR ||
+        enccfg.g_pass != AOM_RC_ONE_PASS) {
+        cpb_props->max_bitrate = avctx->rc_max_rate;
+        cpb_props->min_bitrate = avctx->rc_min_rate;
+        cpb_props->avg_bitrate = avctx->bit_rate;
+    }
+    cpb_props->buffer_size = avctx->rc_buffer_size;
+
+    return 0;
+}
+
+static inline void cx_pktcpy(struct FrameListData *dst,
+                             const struct aom_codec_cx_pkt *src)
+{
+    dst->pts      = src->data.frame.pts;
+    dst->duration = src->data.frame.duration;
+    dst->flags    = src->data.frame.flags;
+    dst->sz       = src->data.frame.sz;
+    dst->buf      = src->data.frame.buf;
+}
+
+/**
+ * Store coded frame information in format suitable for return from encode2().
+ *
+ * Write information from @a cx_frame to @a pkt
+ * @return packet data size on success
+ * @return a negative AVERROR on error
+ */
+static int storeframe(AVCodecContext *avctx, struct FrameListData *cx_frame,
+                      AVPacket *pkt)
+{
+    int ret = ff_alloc_packet2(avctx, pkt, cx_frame->sz, 0);
+    if (ret < 0) {
+        av_log(avctx, AV_LOG_ERROR,
+               "Error getting output packet of size %"SIZE_SPECIFIER".\n", cx_frame->sz);
+        return ret;
+    }
+    memcpy(pkt->data, cx_frame->buf, pkt->size);
+    pkt->pts = pkt->dts = cx_frame->pts;
+
+    if (!!(cx_frame->flags & AOM_FRAME_IS_KEY))
+        pkt->flags |= AV_PKT_FLAG_KEY;
+    return pkt->size;
+}
+
+/**
+ * Queue multiple output frames from the encoder, returning the front-most.
+ * In cases where aom_codec_get_cx_data() returns more than 1 frame append
+ * the frame queue. Return the head frame if available.
+ * @return Stored frame size
+ * @return AVERROR(EINVAL) on output size error
+ * @return AVERROR(ENOMEM) on coded frame queue data allocation error
+ */
+static int queue_frames(AVCodecContext *avctx, AVPacket *pkt_out)
+{
+    AOMContext *ctx = avctx->priv_data;
+    const struct aom_codec_cx_pkt *pkt;
+    const void *iter = NULL;
+    int size = 0;
+
+    if (ctx->coded_frame_list) {
+        struct FrameListData *cx_frame = ctx->coded_frame_list;
+        /* return the leading frame if we've already begun queueing */
+        size = storeframe(avctx, cx_frame, pkt_out);
+        if (size < 0)
+            return size;
+        ctx->coded_frame_list = cx_frame->next;
+        free_coded_frame(cx_frame);
+    }
+
+    /* consume all available output from the encoder before returning. buffers
+     * are only good through the next aom_codec call */
+    while ((pkt = aom_codec_get_cx_data(&ctx->encoder, &iter))) {
+        switch (pkt->kind) {
+        case AOM_CODEC_CX_FRAME_PKT:
+            if (!size) {
+                struct FrameListData cx_frame;
+
+                /* avoid storing the frame when the list is empty and we haven't yet
+                 * provided a frame for output */
+                assert(!ctx->coded_frame_list);
+                cx_pktcpy(&cx_frame, pkt);
+                size = storeframe(avctx, &cx_frame, pkt_out);
+                if (size < 0)
+                    return size;
+            } else {
+                struct FrameListData *cx_frame =
+                    av_malloc(sizeof(struct FrameListData));
+
+                if (!cx_frame) {
+                    av_log(avctx, AV_LOG_ERROR,
+                           "Frame queue element alloc failed\n");
+                    return AVERROR(ENOMEM);
+                }
+                cx_pktcpy(cx_frame, pkt);
+                cx_frame->buf = av_malloc(cx_frame->sz);
+
+                if (!cx_frame->buf) {
+                    av_log(avctx, AV_LOG_ERROR,
+                           "Data buffer alloc (%"SIZE_SPECIFIER" bytes) failed\n",
+                           cx_frame->sz);
+                    av_freep(&cx_frame);
+                    return AVERROR(ENOMEM);
+                }
+                memcpy(cx_frame->buf, pkt->data.frame.buf, pkt->data.frame.sz);
+                coded_frame_add(&ctx->coded_frame_list, cx_frame);
+            }
+            break;
+        case AOM_CODEC_STATS_PKT:
+        {
+            struct aom_fixed_buf *stats = &ctx->twopass_stats;
+            int err;
+            if ((err = av_reallocp(&stats->buf,
+                                   stats->sz +
+                                   pkt->data.twopass_stats.sz)) < 0) {
+                stats->sz = 0;
+                av_log(avctx, AV_LOG_ERROR, "Stat buffer realloc failed\n");
+                return err;
+            }
+            memcpy((uint8_t *)stats->buf + stats->sz,
+                   pkt->data.twopass_stats.buf, pkt->data.twopass_stats.sz);
+            stats->sz += pkt->data.twopass_stats.sz;
+            break;
+        }
+        case AOM_CODEC_PSNR_PKT: // FIXME add support for AV_CODEC_FLAG_PSNR
+        case AOM_CODEC_CUSTOM_PKT:
+            // ignore unsupported/unrecognized packet types
+            break;
+        }
+    }
+
+    return size;
+}
+
+static int aom_encode(AVCodecContext *avctx, AVPacket *pkt,
+                      const AVFrame *frame, int *got_packet)
+{
+    AOMContext *ctx = avctx->priv_data;
+    struct aom_image *rawimg = NULL;
+    int64_t timestamp = 0;
+    int res, coded_size;
+    aom_enc_frame_flags_t flags = 0;
+
+    if (frame) {
+        rawimg                      = &ctx->rawimg;
+        rawimg->planes[AOM_PLANE_Y] = frame->data[0];
+        rawimg->planes[AOM_PLANE_U] = frame->data[1];
+        rawimg->planes[AOM_PLANE_V] = frame->data[2];
+        rawimg->stride[AOM_PLANE_Y] = frame->linesize[0];
+        rawimg->stride[AOM_PLANE_U] = frame->linesize[1];
+        rawimg->stride[AOM_PLANE_V] = frame->linesize[2];
+        timestamp                   = frame->pts;
+        switch (frame->color_range) {
+        case AVCOL_RANGE_MPEG:
+            rawimg->range = AOM_CR_STUDIO_RANGE;
+            break;
+        case AVCOL_RANGE_JPEG:
+            rawimg->range = AOM_CR_FULL_RANGE;
+            break;
+        }
+
+        if (frame->pict_type == AV_PICTURE_TYPE_I)
+            flags |= AOM_EFLAG_FORCE_KF;
+    }
+
+    res = aom_codec_encode(&ctx->encoder, rawimg, timestamp,
+                           avctx->ticks_per_frame, flags);
+    if (res != AOM_CODEC_OK) {
+        log_encoder_error(avctx, "Error encoding frame");
+        return AVERROR_INVALIDDATA;
+    }
+    coded_size = queue_frames(avctx, pkt);
+
+    if (!frame && avctx->flags & AV_CODEC_FLAG_PASS1) {
+        size_t b64_size = AV_BASE64_SIZE(ctx->twopass_stats.sz);
+
+        avctx->stats_out = av_malloc(b64_size);
+        if (!avctx->stats_out) {
+            av_log(avctx, AV_LOG_ERROR, "Stat buffer alloc (%"SIZE_SPECIFIER" bytes) failed\n",
+                   b64_size);
+            return AVERROR(ENOMEM);
+        }
+        av_base64_encode(avctx->stats_out, b64_size, ctx->twopass_stats.buf,
+                         ctx->twopass_stats.sz);
+    }
+
+    *got_packet = !!coded_size;
+    return 0;
+}
+
+static const enum AVPixelFormat av1_pix_fmts[] = {
+    AV_PIX_FMT_YUV420P,
+    AV_PIX_FMT_YUV422P,
+    AV_PIX_FMT_YUV444P,
+    AV_PIX_FMT_GBRP,
+    AV_PIX_FMT_NONE
+};
+
+static const enum AVPixelFormat av1_pix_fmts_highbd[] = {
+    AV_PIX_FMT_YUV420P,
+    AV_PIX_FMT_YUV422P,
+    AV_PIX_FMT_YUV444P,
+    AV_PIX_FMT_YUV420P10,
+    AV_PIX_FMT_YUV422P10,
+    AV_PIX_FMT_YUV444P10,
+    AV_PIX_FMT_YUV420P12,
+    AV_PIX_FMT_YUV422P12,
+    AV_PIX_FMT_YUV444P12,
+    AV_PIX_FMT_GBRP,
+    AV_PIX_FMT_GBRP10,
+    AV_PIX_FMT_GBRP12,
+    AV_PIX_FMT_NONE
+};
+
+static av_cold void av1_init_static(AVCodec *codec)
+{
+    aom_codec_caps_t codec_caps = aom_codec_get_caps(aom_codec_av1_cx());
+    if (codec_caps & AOM_CODEC_CAP_HIGHBITDEPTH)
+        codec->pix_fmts = av1_pix_fmts_highbd;
+    else
+        codec->pix_fmts = av1_pix_fmts;
+}
+
+static av_cold int av1_init(AVCodecContext *avctx)
+{
+    return aom_init(avctx, aom_codec_av1_cx());
+}
+
+#define OFFSET(x) offsetof(AOMContext, x)
+#define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
+static const AVOption options[] = {
+    { "cpu-used",        "Quality/Speed ratio modifier",           OFFSET(cpu_used),        AV_OPT_TYPE_INT, {.i64 = 1}, -8, 8, VE},
+    { "auto-alt-ref",    "Enable use of alternate reference "
+                         "frames (2-pass only)",                   OFFSET(auto_alt_ref),    AV_OPT_TYPE_INT, {.i64 = -1},      -1,      2,       VE},
+    { "lag-in-frames",   "Number of frames to look ahead at for "
+                         "alternate reference frame selection",    OFFSET(lag_in_frames),   AV_OPT_TYPE_INT, {.i64 = -1},      -1,      INT_MAX, VE},
+    { "error-resilience", "Error resilience configuration", OFFSET(error_resilient), AV_OPT_TYPE_FLAGS, {.i64 = 0}, INT_MIN, INT_MAX, VE, "er"},
+    { "default",         "Improve resiliency against losses of whole frames", 0, AV_OPT_TYPE_CONST, {.i64 = AOM_ERROR_RESILIENT_DEFAULT}, 0, 0, VE, "er"},
+    { "partitions",      "The frame partitions are independently decodable "
+                         "by the bool decoder, meaning that partitions can be decoded even "
+                         "though earlier partitions have been lost. Note that intra predicition"
+                         " is still done over the partition boundary.",       0, AV_OPT_TYPE_CONST, {.i64 = AOM_ERROR_RESILIENT_PARTITIONS}, 0, 0, VE, "er"},
+    { "crf",              "Select the quality for constant quality mode", offsetof(AOMContext, crf), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 63, VE },
+    { "static-thresh",    "A change threshold on blocks below which they will be skipped by the encoder", OFFSET(static_thresh), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, VE },
+    { "drop-threshold",   "Frame drop threshold", offsetof(AOMContext, drop_threshold), AV_OPT_TYPE_INT, {.i64 = 0 }, INT_MIN, INT_MAX, VE },
+    { "noise-sensitivity", "Noise sensitivity", OFFSET(noise_sensitivity), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 4, VE},
+    { NULL }
+};
+
+static const AVCodecDefault defaults[] = {
+    { "qmin",             "-1" },
+    { "qmax",             "-1" },
+    { "g",                "-1" },
+    { "keyint_min",       "-1" },
+    { NULL },
+};
+
+static const AVClass class_aom = {
+    .class_name = "libaom-av1 encoder",
+    .item_name  = av_default_item_name,
+    .option     = options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
+AVCodec ff_libaom_av1_encoder = {
+    .name           = "libaom-av1",
+    .long_name      = NULL_IF_CONFIG_SMALL("libaom AV1"),
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_AV1,
+    .priv_data_size = sizeof(AOMContext),
+    .init           = av1_init,
+    .encode2        = aom_encode,
+    .close          = aom_free,
+    .capabilities   = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_AUTO_THREADS | AV_CODEC_CAP_EXPERIMENTAL,
+    .priv_class     = &class_aom,
+    .defaults       = defaults,
+    .init_static_data = av1_init_static,
+    .wrapper_name   = "libaom",
+};