PeerStreamer

/*

 * AVS encoding using the xavs library

 * Copyright (C) 2010 Amanda, Y.N. Wu <amanda11192003@gmail.com>

 *

 * This file is part of FFmpeg.

 *

 * FFmpeg is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * FFmpeg is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with FFmpeg; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

 */

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <math.h>

#include <stdint.h>

#include <xavs.h>

#include "avcodec.h"

#define END_OF_STREAM 0x001

#define XAVS_PART_I8X8 0x002 /* Analyze i8x8 (requires 8x8 transform) */

#define XAVS_PART_P8X8 0x010 /* Analyze p16x8, p8x16 and p8x8 */

#define XAVS_PART_B8X8 0x100 /* Analyze b16x8, b*/

typedef struct XavsContext {

    xavs_param_t    params;

    xavs_t         *enc;

    xavs_picture_t  pic;

    uint8_t        *sei;

    int             sei_size;

    AVFrame         out_pic;

    int             end_of_stream;

} XavsContext;

static void XAVS_log(void *p, int level, const char *fmt, va_list args)

{

    static const int level_map[] = {

        [XAVS_LOG_ERROR]   = AV_LOG_ERROR,

        [XAVS_LOG_WARNING] = AV_LOG_WARNING,

        [XAVS_LOG_INFO]    = AV_LOG_INFO,

        [XAVS_LOG_DEBUG]   = AV_LOG_DEBUG

    };

    if (level < 0 || level > XAVS_LOG_DEBUG)

        return;

    av_vlog(p, level_map[level], fmt, args);

}

static int encode_nals(AVCodecContext *ctx, uint8_t *buf,

                       int size, xavs_nal_t *nals,

                       int nnal, int skip_sei)

{

    XavsContext *x4 = ctx->priv_data;

    uint8_t *p = buf;

    int i, s;

    /* Write the SEI as part of the first frame. */

    if (x4->sei_size > 0 && nnal > 0) {

        memcpy(p, x4->sei, x4->sei_size);

        p += x4->sei_size;

        x4->sei_size = 0;

    }

    for (i = 0; i < nnal; i++) {

        /* Don't put the SEI in extradata. */

        if (skip_sei && nals[i].i_type == NAL_SEI) {

            x4->sei = av_malloc( 5 + nals[i].i_payload * 4 / 3 );

            if (xavs_nal_encode(x4->sei, &x4->sei_size, 1, nals + i) < 0)

                return -1;

            continue;

        }

        s = xavs_nal_encode(p, &size, 1, nals + i);

        if (s < 0)

            return -1;

        p += s;

    }

    return p - buf;

}

static int XAVS_frame(AVCodecContext *ctx, uint8_t *buf,

                      int bufsize, void *data)

{

    XavsContext *x4 = ctx->priv_data;

    AVFrame *frame = data;

    xavs_nal_t *nal;

    int nnal, i;

    xavs_picture_t pic_out;

    x4->pic.img.i_csp   = XAVS_CSP_I420;

    x4->pic.img.i_plane = 3;

    if (frame) {

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

            x4->pic.img.plane[i] = frame->data[i];

            x4->pic.img.i_stride[i] = frame->linesize[i];

       }

        x4->pic.i_pts  = frame->pts;

        x4->pic.i_type = XAVS_TYPE_AUTO;

    }

    if (xavs_encoder_encode(x4->enc, &nal, &nnal,

                            frame? &x4->pic: NULL, &pic_out) < 0)

    return -1;

    bufsize = encode_nals(ctx, buf, bufsize, nal, nnal, 0);

    if (bufsize < 0)

        return -1;

    if (!bufsize && !frame && !(x4->end_of_stream)){

        buf[bufsize]   = 0x0;

        buf[bufsize+1] = 0x0;

        buf[bufsize+2] = 0x01;

        buf[bufsize+3] = 0xb1;

        bufsize += 4;

        x4->end_of_stream = END_OF_STREAM;

        return bufsize;

    }

    /* FIXME: libxavs now provides DTS */

    /* but AVFrame doesn't have a field for it. */

    x4->out_pic.pts = pic_out.i_pts;

    switch (pic_out.i_type) {

    case XAVS_TYPE_IDR:

    case XAVS_TYPE_I:

        x4->out_pic.pict_type = FF_I_TYPE;

        break;

    case XAVS_TYPE_P:

        x4->out_pic.pict_type = FF_P_TYPE;

        break;

    case XAVS_TYPE_B:

    case XAVS_TYPE_BREF:

        x4->out_pic.pict_type = FF_B_TYPE;

        break;

    }

    /* There is no IDR frame in AVS JiZhun */

    /* Sequence header is used as a flag */

    x4->out_pic.key_frame = pic_out.i_type == XAVS_TYPE_I;

    x4->out_pic.quality   = (pic_out.i_qpplus1 - 1) * FF_QP2LAMBDA;

    return bufsize;

}

static av_cold int XAVS_close(AVCodecContext *avctx)

{

    XavsContext *x4 = avctx->priv_data;

    av_freep(&avctx->extradata);

    av_free(x4->sei);

    if (x4->enc)

        xavs_encoder_close(x4->enc);

    return 0;

}

static av_cold int XAVS_init(AVCodecContext *avctx)

{

    XavsContext *x4 = avctx->priv_data;

    x4->sei_size = 0;

    xavs_param_default(&x4->params);

    x4->params.pf_log               = XAVS_log;

    x4->params.p_log_private        = avctx;

    x4->params.i_keyint_max         = avctx->gop_size;

    x4->params.rc.i_bitrate         = avctx->bit_rate       / 1000;

    x4->params.rc.i_vbv_buffer_size = avctx->rc_buffer_size / 1000;

    x4->params.rc.i_vbv_max_bitrate = avctx->rc_max_rate    / 1000;

    x4->params.rc.b_stat_write      = avctx->flags & CODEC_FLAG_PASS1;

    if (avctx->flags & CODEC_FLAG_PASS2) {

        x4->params.rc.b_stat_read = 1;

    } else {

        if (avctx->crf) {

            x4->params.rc.i_rc_method   = XAVS_RC_CRF;

            x4->params.rc.f_rf_constant = avctx->crf;

        } else if (avctx->cqp > -1) {

            x4->params.rc.i_rc_method   = XAVS_RC_CQP;

            x4->params.rc.i_qp_constant = avctx->cqp;

        }

    }

    /* if neither crf nor cqp modes are selected we have to enable the RC */

    /* we do it this way because we cannot check if the bitrate has been set */

    if (!(avctx->crf || (avctx->cqp > -1)))

        x4->params.rc.i_rc_method = XAVS_RC_ABR;

    x4->params.i_bframe          = avctx->max_b_frames;

    /* cabac is not included in AVS JiZhun Profile */

    x4->params.b_cabac           = 0;

    x4->params.i_bframe_adaptive = avctx->b_frame_strategy;

    x4->params.i_bframe_bias     = avctx->bframebias;

    avctx->has_b_frames          = !!avctx->max_b_frames;

    /* AVS doesn't allow B picture as reference */

    /* The max allowed reference frame number of B is 2 */

    x4->params.i_keyint_min      = avctx->keyint_min;

    if (x4->params.i_keyint_min > x4->params.i_keyint_max)

        x4->params.i_keyint_min = x4->params.i_keyint_max;

    x4->params.i_scenecut_threshold        = avctx->scenechange_threshold;

   // x4->params.b_deblocking_filter       = avctx->flags & CODEC_FLAG_LOOP_FILTER;

    x4->params.i_deblocking_filter_alphac0 = avctx->deblockalpha;

    x4->params.i_deblocking_filter_beta    = avctx->deblockbeta;

    x4->params.rc.i_qp_min                 = avctx->qmin;

    x4->params.rc.i_qp_max                 = avctx->qmax;

    x4->params.rc.i_qp_step                = avctx->max_qdiff;

    x4->params.rc.f_qcompress       = avctx->qcompress; /* 0.0 => cbr, 1.0 => constant qp */

    x4->params.rc.f_qblur           = avctx->qblur;     /* temporally blur quants */

    x4->params.rc.f_complexity_blur = avctx->complexityblur;

    x4->params.i_frame_reference    = avctx->refs;

    x4->params.i_width              = avctx->width;

    x4->params.i_height             = avctx->height;

    x4->params.vui.i_sar_width      = avctx->sample_aspect_ratio.num;

    x4->params.vui.i_sar_height     = avctx->sample_aspect_ratio.den;

    /* This is only used for counting the fps */

    x4->params.i_fps_num            = avctx->time_base.den;

    x4->params.i_fps_den            = avctx->time_base.num;

    x4->params.analyse.inter        = XAVS_ANALYSE_I8x8 |XAVS_ANALYSE_PSUB16x16| XAVS_ANALYSE_BSUB16x16;

    if (avctx->partitions) {

        if (avctx->partitions & XAVS_PART_I8X8)

            x4->params.analyse.inter |= XAVS_ANALYSE_I8x8;

        if (avctx->partitions & XAVS_PART_P8X8)

            x4->params.analyse.inter |= XAVS_ANALYSE_PSUB16x16;

        if (avctx->partitions & XAVS_PART_B8X8)

            x4->params.analyse.inter |= XAVS_ANALYSE_BSUB16x16;

    }

    x4->params.analyse.i_direct_mv_pred  = avctx->directpred;

    x4->params.analyse.b_weighted_bipred = avctx->flags2 & CODEC_FLAG2_WPRED;

    switch (avctx->me_method) {

         case  ME_EPZS:

               x4->params.analyse.i_me_method = XAVS_ME_DIA;

               break;

         case  ME_HEX:

               x4->params.analyse.i_me_method = XAVS_ME_HEX;

               break;

         case  ME_UMH:

               x4->params.analyse.i_me_method = XAVS_ME_UMH;

               break;

         case  ME_FULL:

               x4->params.analyse.i_me_method = XAVS_ME_ESA;

               break;

         case  ME_TESA:

               x4->params.analyse.i_me_method = XAVS_ME_TESA;

               break;

         default:

               x4->params.analyse.i_me_method = XAVS_ME_HEX;

    }

    x4->params.analyse.i_me_range = avctx->me_range;

    x4->params.analyse.i_subpel_refine    = avctx->me_subpel_quality;

    x4->params.analyse.b_mixed_references = avctx->flags2 & CODEC_FLAG2_MIXED_REFS;

    x4->params.analyse.b_chroma_me        = avctx->me_cmp & FF_CMP_CHROMA;

    /* AVS P2 only enables 8x8 transform */

    x4->params.analyse.b_transform_8x8    = 1; //avctx->flags2 & CODEC_FLAG2_8X8DCT;

    x4->params.analyse.b_fast_pskip       = avctx->flags2 & CODEC_FLAG2_FASTPSKIP;

    x4->params.analyse.i_trellis          = avctx->trellis;

    x4->params.analyse.i_noise_reduction  = avctx->noise_reduction;

    if (avctx->level > 0)

        x4->params.i_level_idc = avctx->level;

    x4->params.rc.f_rate_tolerance =

        (float)avctx->bit_rate_tolerance/avctx->bit_rate;

    if ((avctx->rc_buffer_size) &&

        (avctx->rc_initial_buffer_occupancy <= avctx->rc_buffer_size)) {

        x4->params.rc.f_vbv_buffer_init =

            (float)avctx->rc_initial_buffer_occupancy / avctx->rc_buffer_size;

    } else

        x4->params.rc.f_vbv_buffer_init = 0.9;

    /* TAG:do we have MB tree RC method */

    /* what is the RC method we are now using? Default NO */

    x4->params.rc.b_mb_tree               = !!(avctx->flags2 & CODEC_FLAG2_MBTREE);

    x4->params.rc.f_ip_factor             = 1 / fabs(avctx->i_quant_factor);

    x4->params.rc.f_pb_factor             = avctx->b_quant_factor;

    x4->params.analyse.i_chroma_qp_offset = avctx->chromaoffset;

    x4->params.analyse.b_psnr = avctx->flags & CODEC_FLAG_PSNR;

    x4->params.i_log_level    = XAVS_LOG_DEBUG;

    x4->params.b_aud          = avctx->flags2 & CODEC_FLAG2_AUD;

    x4->params.i_threads      = avctx->thread_count;

    x4->params.b_interlaced   = avctx->flags & CODEC_FLAG_INTERLACED_DCT;

    if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER)

        x4->params.b_repeat_headers = 0;

    x4->enc = xavs_encoder_open(&x4->params);

    if (!x4->enc)

        return -1;

    avctx->coded_frame = &x4->out_pic;

    /* TAG: Do we have GLOBAL HEADER in AVS */

    /* We Have PPS and SPS in AVS */

    if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) {

        xavs_nal_t *nal;

        int nnal, s;

        s = xavs_encoder_headers(x4->enc, &nal, &nnal);

        avctx->extradata      = av_malloc(s);

        avctx->extradata_size = encode_nals(avctx, avctx->extradata, s, nal, nnal, 1);

    }

    return 0;

}

AVCodec libxavs_encoder = {

    .name           = "libxavs",

    .type           = AVMEDIA_TYPE_VIDEO,

    .id             = CODEC_ID_CAVS,

    .priv_data_size = sizeof(XavsContext),

    .init           = XAVS_init,

    .encode         = XAVS_frame,

    .close          = XAVS_close,

    .capabilities   = CODEC_CAP_DELAY,

    .pix_fmts       = (const enum PixelFormat[]) { PIX_FMT_YUV420P, PIX_FMT_NONE },

    .long_name      = NULL_IF_CONFIG_SMALL("libxavs - the Chinese Audio Video Standard Encoder"),

};