PeerStreamer

/*

 * 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);

    enccfg.rc_min_quantizer = avctx->qmin;

    enccfg.rc_max_quantizer = avctx->qmax;

    enccfg.rc_dropframe_thresh = avctx->frame_skip_threshold;

    //_enc_init() will balk if kf_min_dist differs from max w/VPX_KF_AUTO

    if (avctx->keyint_min == avctx->gop_size)

        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;

    /* 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;

    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 = 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 (%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"),

};