VP8 encoding via libvpx.

Patch by James Zern, Google, Inc.

Originally committed as revision 23449 to svn://svn.ffmpeg.org/ffmpeg/trunk

4 files changed, 492 insertions, 2 deletions

diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 764555e38f..c4e7bedf70 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -537,6 +537,7 @@ OBJS-$(CONFIG_LIBSPEEX_DECODER)           += libspeexdec.o
 OBJS-$(CONFIG_LIBTHEORA_ENCODER)          += libtheoraenc.o
 OBJS-$(CONFIG_LIBVORBIS_ENCODER)          += libvorbis.o
 OBJS-$(CONFIG_LIBVPX_DECODER)             += libvpxdec.o
+OBJS-$(CONFIG_LIBVPX_ENCODER)             += libvpxenc.o
 OBJS-$(CONFIG_LIBX264_ENCODER)            += libx264.o
 OBJS-$(CONFIG_LIBXVID_ENCODER)            += libxvidff.o libxvid_rc.o
 
diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index a5d8ce192f..10925de70f 100644
--- a/libavcodec/allcodecs.c
+++ b/libavcodec/allcodecs.c
@@ -349,7 +349,7 @@ void avcodec_register_all(void)
     REGISTER_DECODER (LIBSPEEX, libspeex);
     REGISTER_ENCODER (LIBTHEORA, libtheora);
     REGISTER_ENCODER (LIBVORBIS, libvorbis);
-    REGISTER_DECODER (LIBVPX, libvpx);
+    REGISTER_ENCDEC  (LIBVPX, libvpx);
     REGISTER_ENCODER (LIBX264, libx264);
     REGISTER_ENCODER (LIBXVID, libxvid);
 
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 243f34d9cb..b37329d35c 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -30,7 +30,7 @@
 #include "libavutil/avutil.h"
 
 #define LIBAVCODEC_VERSION_MAJOR 52
-#define LIBAVCODEC_VERSION_MINOR 73
+#define LIBAVCODEC_VERSION_MINOR 74
 #define LIBAVCODEC_VERSION_MICRO  0
 
 #define LIBAVCODEC_VERSION_INT  AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
diff --git a/libavcodec/libvpxenc.c b/libavcodec/libvpxenc.c
new file mode 100644
index 0000000000..fa393b8f42
--- /dev/null
+++ b/libavcodec/libvpxenc.c
@@ -0,0 +1,489 @@
+/*
+ * 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
+ * VP8 encoder support via libvpx
+ */
+
+#define VPX_DISABLE_CTRL_TYPECHECKS 1
+#define VPX_CODEC_DISABLE_COMPAT    1
+#include <vpx/vpx_encoder.h>
+#include <vpx/vp8cx.h>
+
+#include "avcodec.h"
+#include "libavutil/base64.h"
+
+/**
+ * Portion of struct vpx_codec_cx_pkt from vpx_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 VP8EncoderContext {
+    struct vpx_codec_ctx encoder;
+    struct vpx_image rawimg;
+    struct vpx_fixed_buf twopass_stats;
+    unsigned long deadline; //i.e., RT/GOOD/BEST
+    struct FrameListData *coded_frame_list;
+} VP8Context;
+
+/** String mappings for enum vp8e_enc_control_id */
+static const char *ctlidstr[] = {
+    [VP8E_UPD_ENTROPY]           = "VP8E_UPD_ENTROPY",
+    [VP8E_UPD_REFERENCE]         = "VP8E_UPD_REFERENCE",
+    [VP8E_USE_REFERENCE]         = "VP8E_USE_REFERENCE",
+    [VP8E_SET_ROI_MAP]           = "VP8E_SET_ROI_MAP",
+    [VP8E_SET_ACTIVEMAP]         = "VP8E_SET_ACTIVEMAP",
+    [VP8E_SET_SCALEMODE]         = "VP8E_SET_SCALEMODE",
+    [VP8E_SET_CPUUSED]           = "VP8E_SET_CPUUSED",
+    [VP8E_SET_ENABLEAUTOALTREF]  = "VP8E_SET_ENABLEAUTOALTREF",
+    [VP8E_SET_NOISE_SENSITIVITY] = "VP8E_SET_NOISE_SENSITIVITY",
+    [VP8E_SET_SHARPNESS]         = "VP8E_SET_SHARPNESS",
+    [VP8E_SET_STATIC_THRESHOLD]  = "VP8E_SET_STATIC_THRESHOLD",
+    [VP8E_SET_TOKEN_PARTITIONS]  = "VP8E_SET_TOKEN_PARTITIONS",
+    [VP8E_GET_LAST_QUANTIZER]    = "VP8E_GET_LAST_QUANTIZER",
+    [VP8E_SET_ARNR_MAXFRAMES]    = "VP8E_SET_ARNR_MAXFRAMES",
+    [VP8E_SET_ARNR_STRENGTH]     = "VP8E_SET_ARNR_STRENGTH",
+    [VP8E_SET_ARNR_TYPE]         = "VP8E_SET_ARNR_TYPE",
+};
+
+static av_cold void log_encoder_error(AVCodecContext *avctx, const char *desc)
+{
+    VP8Context *ctx = avctx->priv_data;
+    const char *error  = vpx_codec_error(&ctx->encoder);
+    const char *detail = vpx_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 vpx_codec_enc_cfg *cfg)
+{
+    int width = -30;
+    int level = AV_LOG_DEBUG;
+
+    av_log(avctx, level, "vpx_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/%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_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%u\n  %*s%u\n  %*s%u\n"
+           "  %*s%d\n  %*s%p(%zu)\n  %*s%u\n",
+           width, "rc_dropframe_thresh:",   cfg->rc_dropframe_thresh,
+           width, "rc_resize_allowed:",     cfg->rc_resize_allowed,
+           width, "rc_resize_up_thresh:",   cfg->rc_resize_up_thresh,
+           width, "rc_resize_down_thresh:", cfg->rc_resize_down_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 != NULL)
+        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 vp8e_enc_control_id id, int val)
+{
+    VP8Context *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 = vpx_codec_control(&ctx->encoder, id, val);
+    if (res != VPX_CODEC_OK) {
+        snprintf(buf, sizeof(buf), "Failed to set %s codec control",
+                 ctlidstr[id]);
+        log_encoder_error(avctx, buf);
+    }
+
+    return res == VPX_CODEC_OK ? 0 : AVERROR(EINVAL);
+}
+
+static av_cold int vp8_free(AVCodecContext *avctx)
+{
+    VP8Context *ctx = avctx->priv_data;
+
+    vpx_codec_destroy(&ctx->encoder);
+    av_freep(&ctx->twopass_stats.buf);
+    av_freep(&avctx->coded_frame);
+    av_freep(&avctx->stats_out);
+    free_frame_list(ctx->coded_frame_list);
+    return 0;
+}
+
+static av_cold int vp8_init(AVCodecContext *avctx)
+{
+    VP8Context *ctx = avctx->priv_data;
+    const struct vpx_codec_iface *iface = &vpx_codec_vp8_cx_algo;
+    int cpuused = 3;
+    struct vpx_codec_enc_cfg enccfg;
+    int res;
+
+    av_log(avctx, AV_LOG_INFO, "%s\n", vpx_codec_version_str());
+    av_log(avctx, AV_LOG_VERBOSE, "%s\n", vpx_codec_build_config());
+
+    if ((res = vpx_codec_enc_config_default(iface, &enccfg, 0)) != VPX_CODEC_OK) {
+        av_log(avctx, AV_LOG_ERROR, "Failed to get config: %s\n",
+               vpx_codec_err_to_string(res));
+        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 (avctx->flags & CODEC_FLAG_PASS1)
+        enccfg.g_pass = VPX_RC_FIRST_PASS;
+    else if (avctx->flags & CODEC_FLAG_PASS2)
+        enccfg.g_pass = VPX_RC_LAST_PASS;
+    else
+        enccfg.g_pass = VPX_RC_ONE_PASS;
+
+    if (avctx->rc_min_rate == avctx->rc_max_rate &&
+        avctx->rc_min_rate == avctx->bit_rate)
+        enccfg.rc_end_usage = VPX_CBR;
+    enccfg.rc_target_bitrate = av_rescale_rnd(avctx->bit_rate, 1, 1000,
+                                              AV_ROUND_NEAR_INF);
+
+    //convert [1,51] -> [0,63]
+    enccfg.rc_min_quantizer = ((avctx->qmin * 5 + 1) >> 2) - 1;
+    enccfg.rc_max_quantizer = ((avctx->qmax * 5 + 1) >> 2) - 1;
+
+    if (avctx->keyint_min == avctx->gop_size)
+        enccfg.kf_mode = VPX_KF_FIXED;
+    //_enc_init() will balk if kf_min_dist is set in this case
+    if (enccfg.kf_mode != VPX_KF_AUTO)
+        enccfg.kf_min_dist = avctx->keyint_min;
+    enccfg.kf_max_dist     = avctx->gop_size;
+
+    if (enccfg.g_pass == VPX_RC_FIRST_PASS)
+        enccfg.g_lag_in_frames = 0;
+    else if (enccfg.g_pass == VPX_RC_LAST_PASS) {
+        int decode_size;
+
+        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;
+        ctx->twopass_stats.buf = av_malloc(ctx->twopass_stats.sz);
+        if (!ctx->twopass_stats.buf) {
+            av_log(avctx, AV_LOG_ERROR,
+                   "Stat buffer alloc (%zu bytes) failed\n",
+                   ctx->twopass_stats.sz);
+            return AVERROR(ENOMEM);
+        }
+        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;
+    }
+
+    ctx->deadline = VPX_DL_GOOD_QUALITY;
+
+    dump_enc_cfg(avctx, &enccfg);
+    /* Construct Encoder Context */
+    res = vpx_codec_enc_init(&ctx->encoder, iface, &enccfg, 0);
+    if (res != VPX_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, "vpx_codec_control\n");
+    codecctl_int(avctx, VP8E_SET_CPUUSED,           cpuused);
+    codecctl_int(avctx, VP8E_SET_NOISE_SENSITIVITY, avctx->noise_reduction);
+
+    //provide dummy value to initialize wrapper, values will be updated each _encode()
+    vpx_img_wrap(&ctx->rawimg, VPX_IMG_FMT_I420, avctx->width, avctx->height, 1,
+                 (unsigned char*)1);
+
+    avctx->coded_frame = avcodec_alloc_frame();
+    if (!avctx->coded_frame) {
+        av_log(avctx, AV_LOG_ERROR, "Error allocating coded frame\n");
+        vp8_free(avctx);
+        return AVERROR(ENOMEM);
+    }
+    return 0;
+}
+
+static inline void cx_pktcpy(struct FrameListData *dst,
+                             const struct vpx_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 encode().
+ *
+ * Write buffer information from @a cx_frame to @a buf & @a buf_size.
+ * Timing/frame details to @a coded_frame.
+ * @return Frame size written to @a buf on success
+ * @return AVERROR(EINVAL) on error
+ */
+static int storeframe(AVCodecContext *avctx, struct FrameListData *cx_frame,
+                      uint8_t *buf, int buf_size, AVFrame *coded_frame)
+{
+    if ((int) cx_frame->sz <= buf_size) {
+        buf_size = cx_frame->sz;
+        memcpy(buf, cx_frame->buf, buf_size);
+        coded_frame->pts       = cx_frame->pts;
+        coded_frame->key_frame = !!(cx_frame->flags & VPX_FRAME_IS_KEY);
+
+        if (coded_frame->key_frame)
+            coded_frame->pict_type = FF_I_TYPE;
+        else
+            coded_frame->pict_type = FF_P_TYPE;
+    } else {
+        av_log(avctx, AV_LOG_ERROR,
+               "Compressed frame larger than storage provided! (%zu/%d)\n",
+               cx_frame->sz, buf_size);
+        return AVERROR(EINVAL);
+    }
+    return buf_size;
+}
+
+/**
+ * Queue multiple output frames from the encoder, returning the front-most.
+ * In cases where vpx_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, uint8_t *buf, int buf_size,
+                        AVFrame *coded_frame)
+{
+    VP8Context *ctx = avctx->priv_data;
+    const struct vpx_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, buf, buf_size, coded_frame);
+        if (size < 0)
+            return AVERROR(EINVAL);
+        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 vpx_codec call */
+    while ((pkt = vpx_codec_get_cx_data(&ctx->encoder, &iter))) {
+        switch (pkt->kind) {
+        case VPX_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, buf, buf_size, coded_frame);
+                if (size < 0)
+                    return AVERROR(EINVAL);
+            } 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 (%zu bytes) failed\n",
+                           cx_frame->sz);
+                    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 VPX_CODEC_STATS_PKT: {
+            struct vpx_fixed_buf *stats = &ctx->twopass_stats;
+            stats->buf = av_realloc(stats->buf,
+                                    stats->sz + pkt->data.twopass_stats.sz);
+            if (!stats->buf) {
+                av_log(avctx, AV_LOG_ERROR, "Stat buffer realloc failed\n");
+                return AVERROR(ENOMEM);
+            }
+            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 VPX_CODEC_PSNR_PKT: //FIXME add support for CODEC_FLAG_PSNR
+        case VPX_CODEC_CUSTOM_PKT:
+            //ignore unsupported/unrecognized packet types
+            break;
+        }
+    }
+
+    return size;
+}
+
+static int vp8_encode(AVCodecContext *avctx, uint8_t *buf, int buf_size,
+                      void *data)
+{
+    VP8Context *ctx = avctx->priv_data;
+    AVFrame *frame = data;
+    struct vpx_image *rawimg = NULL;
+    int64_t timestamp = 0;
+    int res, coded_size;
+
+    if (frame) {
+        rawimg                      = &ctx->rawimg;
+        rawimg->planes[VPX_PLANE_Y] = frame->data[0];
+        rawimg->planes[VPX_PLANE_U] = frame->data[1];
+        rawimg->planes[VPX_PLANE_V] = frame->data[2];
+        rawimg->stride[VPX_PLANE_Y] = frame->linesize[0];
+        rawimg->stride[VPX_PLANE_U] = frame->linesize[1];
+        rawimg->stride[VPX_PLANE_V] = frame->linesize[2];
+        timestamp                   = frame->pts;
+    }
+
+    res = vpx_codec_encode(&ctx->encoder, rawimg, timestamp,
+                           avctx->ticks_per_frame, 0, ctx->deadline);
+    if (res != VPX_CODEC_OK) {
+        log_encoder_error(avctx, "Error encoding frame");
+        return AVERROR_INVALIDDATA;
+    }
+    coded_size = queue_frames(avctx, buf, buf_size, avctx->coded_frame);
+
+    if (!frame && avctx->flags & CODEC_FLAG_PASS1) {
+        unsigned int b64_size = ((ctx->twopass_stats.sz + 2) / 3) * 4 + 1;
+
+        avctx->stats_out = av_malloc(b64_size);
+        if (!avctx->stats_out) {
+            av_log(avctx, AV_LOG_ERROR, "Stat buffer alloc (%d bytes) failed\n",
+                   b64_size);
+            return AVERROR(ENOMEM);
+        }
+        av_base64_encode(avctx->stats_out, b64_size, ctx->twopass_stats.buf,
+                         ctx->twopass_stats.sz);
+    }
+    return coded_size;
+}
+
+AVCodec libvpx_encoder = {
+    "libvpx",
+    AVMEDIA_TYPE_VIDEO,
+    CODEC_ID_VP8,
+    sizeof(VP8Context),
+    vp8_init,
+    vp8_encode,
+    vp8_free,
+    NULL,
+    CODEC_CAP_DELAY,
+    .pix_fmts = (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
+    .long_name = NULL_IF_CONFIG_SMALL("libvpx VP8"),
+};