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  1. /*
  2.  * AVS encoding using the xavs library
  3.  * Copyright (C) 2010 Amanda, Y.N. Wu <amanda11192003@gmail.com>
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. #include <stdio.h>
  23. #include <stdlib.h>
  24. #include <string.h>
  25. #include <math.h>
  26. #include <stdint.h>
  27. #include <float.h>
  28. #include <xavs.h>
  29. #include "avcodec.h"
  30. #include "internal.h"
  31. #include "libavutil/internal.h"
  32. #include "libavutil/mem.h"
  33. #include "libavutil/opt.h"
  34.  
  35. #define END_OF_STREAM 0x001
  36.  
  37. #define XAVS_PART_I8X8 0x002 /* Analyze i8x8 (requires 8x8 transform) */
  38. #define XAVS_PART_P8X8 0x010 /* Analyze p16x8, p8x16 and p8x8 */
  39. #define XAVS_PART_B8X8 0x100 /* Analyze b16x8, b*/
  40.  
  41. typedef struct XavsContext {
  42.     AVClass        *class;
  43.     xavs_param_t    params;
  44.     xavs_t         *enc;
  45.     xavs_picture_t  pic;
  46.     uint8_t        *sei;
  47.     int             sei_size;
  48.     AVFrame         out_pic;
  49.     int             end_of_stream;
  50.     float crf;
  51.     int cqp;
  52.     int b_bias;
  53.     float cplxblur;
  54.     int direct_pred;
  55.     int aud;
  56.     int fast_pskip;
  57.     int mbtree;
  58.     int mixed_refs;
  59.  
  60.     int64_t *pts_buffer;
  61.     int out_frame_count;
  62. } XavsContext;
  63.  
  64. static void XAVS_log(void *p, int level, const char *fmt, va_list args)
  65. {
  66.     static const int level_map[] = {
  67.         [XAVS_LOG_ERROR]   = AV_LOG_ERROR,
  68.         [XAVS_LOG_WARNING] = AV_LOG_WARNING,
  69.         [XAVS_LOG_INFO]    = AV_LOG_INFO,
  70.         [XAVS_LOG_DEBUG]   = AV_LOG_DEBUG
  71.     };
  72.  
  73.     if (level < 0 || level > XAVS_LOG_DEBUG)
  74.         return;
  75.  
  76.     av_vlog(p, level_map[level], fmt, args);
  77. }
  78.  
  79. static int encode_nals(AVCodecContext *ctx, AVPacket *pkt,
  80.                        xavs_nal_t *nals, int nnal)
  81. {
  82.     XavsContext *x4 = ctx->priv_data;
  83.     uint8_t *p;
  84.     int i, s, ret, size = x4->sei_size + FF_MIN_BUFFER_SIZE;
  85.  
  86.     if (!nnal)
  87.         return 0;
  88.  
  89.     for (i = 0; i < nnal; i++)
  90.         size += nals[i].i_payload;
  91.  
  92.     if ((ret = ff_alloc_packet2(ctx, pkt, size)) < 0)
  93.         return ret;
  94.     p = pkt->data;
  95.  
  96.     /* Write the SEI as part of the first frame. */
  97.     if (x4->sei_size > 0 && nnal > 0) {
  98.         memcpy(p, x4->sei, x4->sei_size);
  99.         p += x4->sei_size;
  100.         x4->sei_size = 0;
  101.     }
  102.  
  103.     for (i = 0; i < nnal; i++) {
  104.         s = xavs_nal_encode(p, &size, 1, nals + i);
  105.         if (s < 0)
  106.             return -1;
  107.         p += s;
  108.     }
  109.     pkt->size = p - pkt->data;
  110.  
  111.     return 1;
  112. }
  113.  
  114. static int XAVS_frame(AVCodecContext *ctx, AVPacket *pkt,
  115.                       const AVFrame *frame, int *got_packet)
  116. {
  117.     XavsContext *x4 = ctx->priv_data;
  118.     xavs_nal_t *nal;
  119.     int nnal, i, ret;
  120.     xavs_picture_t pic_out;
  121.  
  122.     x4->pic.img.i_csp   = XAVS_CSP_I420;
  123.     x4->pic.img.i_plane = 3;
  124.  
  125.     if (frame) {
  126.        for (i = 0; i < 3; i++) {
  127.             x4->pic.img.plane[i] = frame->data[i];
  128.             x4->pic.img.i_stride[i] = frame->linesize[i];
  129.        }
  130.  
  131.         x4->pic.i_pts  = frame->pts;
  132.         x4->pic.i_type = XAVS_TYPE_AUTO;
  133.         x4->pts_buffer[ctx->frame_number % (ctx->max_b_frames+1)] = frame->pts;
  134.     }
  135.  
  136.     if (xavs_encoder_encode(x4->enc, &nal, &nnal,
  137.                             frame? &x4->pic: NULL, &pic_out) < 0)
  138.     return -1;
  139.  
  140.     ret = encode_nals(ctx, pkt, nal, nnal);
  141.  
  142.     if (ret < 0)
  143.         return -1;
  144.  
  145.     if (!ret) {
  146.         if (!frame && !(x4->end_of_stream)) {
  147.             if ((ret = ff_alloc_packet2(ctx, pkt, 4)) < 0)
  148.                 return ret;
  149.  
  150.             pkt->data[0] = 0x0;
  151.             pkt->data[1] = 0x0;
  152.             pkt->data[2] = 0x01;
  153.             pkt->data[3] = 0xb1;
  154.             pkt->dts = 2*x4->pts_buffer[(x4->out_frame_count-1)%(ctx->max_b_frames+1)] -
  155.                        x4->pts_buffer[(x4->out_frame_count-2)%(ctx->max_b_frames+1)];
  156.             x4->end_of_stream = END_OF_STREAM;
  157.             *got_packet = 1;
  158.         }
  159.         return 0;
  160.     }
  161.  
  162.     x4->out_pic.pts = pic_out.i_pts;
  163.     pkt->pts = pic_out.i_pts;
  164.     if (ctx->has_b_frames) {
  165.         if (!x4->out_frame_count)
  166.             pkt->dts = pkt->pts - (x4->pts_buffer[1] - x4->pts_buffer[0]);
  167.         else
  168.             pkt->dts = x4->pts_buffer[(x4->out_frame_count-1)%(ctx->max_b_frames+1)];
  169.     } else
  170.         pkt->dts = pkt->pts;
  171.  
  172.     switch (pic_out.i_type) {
  173.     case XAVS_TYPE_IDR:
  174.     case XAVS_TYPE_I:
  175.         x4->out_pic.pict_type = AV_PICTURE_TYPE_I;
  176.         break;
  177.     case XAVS_TYPE_P:
  178.         x4->out_pic.pict_type = AV_PICTURE_TYPE_P;
  179.         break;
  180.     case XAVS_TYPE_B:
  181.     case XAVS_TYPE_BREF:
  182.         x4->out_pic.pict_type = AV_PICTURE_TYPE_B;
  183.         break;
  184.     }
  185.  
  186.     /* There is no IDR frame in AVS JiZhun */
  187.     /* Sequence header is used as a flag */
  188.     if (pic_out.i_type == XAVS_TYPE_I) {
  189.         x4->out_pic.key_frame = 1;
  190.         pkt->flags |= AV_PKT_FLAG_KEY;
  191.     }
  192.  
  193.     x4->out_pic.quality   = (pic_out.i_qpplus1 - 1) * FF_QP2LAMBDA;
  194.  
  195.     x4->out_frame_count++;
  196.     *got_packet = ret;
  197.     return 0;
  198. }
  199.  
  200. static av_cold int XAVS_close(AVCodecContext *avctx)
  201. {
  202.     XavsContext *x4 = avctx->priv_data;
  203.  
  204.     av_freep(&avctx->extradata);
  205.     av_free(x4->sei);
  206.     av_freep(&x4->pts_buffer);
  207.  
  208.     if (x4->enc)
  209.         xavs_encoder_close(x4->enc);
  210.  
  211.     return 0;
  212. }
  213.  
  214. static av_cold int XAVS_init(AVCodecContext *avctx)
  215. {
  216.     XavsContext *x4 = avctx->priv_data;
  217.  
  218.     x4->sei_size = 0;
  219.     xavs_param_default(&x4->params);
  220.  
  221.     x4->params.pf_log               = XAVS_log;
  222.     x4->params.p_log_private        = avctx;
  223.     x4->params.i_keyint_max         = avctx->gop_size;
  224.     if (avctx->bit_rate) {
  225.         x4->params.rc.i_bitrate   = avctx->bit_rate / 1000;
  226.         x4->params.rc.i_rc_method = XAVS_RC_ABR;
  227.     }
  228.     x4->params.rc.i_vbv_buffer_size = avctx->rc_buffer_size / 1000;
  229.     x4->params.rc.i_vbv_max_bitrate = avctx->rc_max_rate    / 1000;
  230.     x4->params.rc.b_stat_write      = avctx->flags & CODEC_FLAG_PASS1;
  231.     if (avctx->flags & CODEC_FLAG_PASS2) {
  232.         x4->params.rc.b_stat_read = 1;
  233.     } else {
  234.         if (x4->crf >= 0) {
  235.             x4->params.rc.i_rc_method   = XAVS_RC_CRF;
  236.             x4->params.rc.f_rf_constant = x4->crf;
  237.         } else if (x4->cqp >= 0) {
  238.             x4->params.rc.i_rc_method   = XAVS_RC_CQP;
  239.             x4->params.rc.i_qp_constant = x4->cqp;
  240.         }
  241.     }
  242.  
  243.     if (x4->aud >= 0)
  244.         x4->params.b_aud                      = x4->aud;
  245.     if (x4->mbtree >= 0)
  246.         x4->params.rc.b_mb_tree               = x4->mbtree;
  247.     if (x4->direct_pred >= 0)
  248.         x4->params.analyse.i_direct_mv_pred   = x4->direct_pred;
  249.     if (x4->fast_pskip >= 0)
  250.         x4->params.analyse.b_fast_pskip       = x4->fast_pskip;
  251.     if (x4->mixed_refs >= 0)
  252.         x4->params.analyse.b_mixed_references = x4->mixed_refs;
  253.     if (x4->b_bias != INT_MIN)
  254.         x4->params.i_bframe_bias              = x4->b_bias;
  255.     if (x4->cplxblur >= 0)
  256.         x4->params.rc.f_complexity_blur = x4->cplxblur;
  257.  
  258.     x4->params.i_bframe          = avctx->max_b_frames;
  259.     /* cabac is not included in AVS JiZhun Profile */
  260.     x4->params.b_cabac           = 0;
  261.  
  262.     x4->params.i_bframe_adaptive = avctx->b_frame_strategy;
  263.  
  264.     avctx->has_b_frames          = !!avctx->max_b_frames;
  265.  
  266.     /* AVS doesn't allow B picture as reference */
  267.     /* The max allowed reference frame number of B is 2 */
  268.     x4->params.i_keyint_min      = avctx->keyint_min;
  269.     if (x4->params.i_keyint_min > x4->params.i_keyint_max)
  270.         x4->params.i_keyint_min = x4->params.i_keyint_max;
  271.  
  272.     x4->params.i_scenecut_threshold        = avctx->scenechange_threshold;
  273.  
  274.    // x4->params.b_deblocking_filter       = avctx->flags & CODEC_FLAG_LOOP_FILTER;
  275.  
  276.     x4->params.rc.i_qp_min                 = avctx->qmin;
  277.     x4->params.rc.i_qp_max                 = avctx->qmax;
  278.     x4->params.rc.i_qp_step                = avctx->max_qdiff;
  279.  
  280.     x4->params.rc.f_qcompress       = avctx->qcompress; /* 0.0 => cbr, 1.0 => constant qp */
  281.     x4->params.rc.f_qblur           = avctx->qblur;     /* temporally blur quants */
  282.  
  283.     x4->params.i_frame_reference    = avctx->refs;
  284.  
  285.     x4->params.i_width              = avctx->width;
  286.     x4->params.i_height             = avctx->height;
  287.     x4->params.vui.i_sar_width      = avctx->sample_aspect_ratio.num;
  288.     x4->params.vui.i_sar_height     = avctx->sample_aspect_ratio.den;
  289.     /* This is only used for counting the fps */
  290.     x4->params.i_fps_num            = avctx->time_base.den;
  291.     x4->params.i_fps_den            = avctx->time_base.num;
  292.     x4->params.analyse.inter        = XAVS_ANALYSE_I8x8 |XAVS_ANALYSE_PSUB16x16| XAVS_ANALYSE_BSUB16x16;
  293.  
  294.     switch (avctx->me_method) {
  295.          case  ME_EPZS:
  296.                x4->params.analyse.i_me_method = XAVS_ME_DIA;
  297.                break;
  298.          case  ME_HEX:
  299.                x4->params.analyse.i_me_method = XAVS_ME_HEX;
  300.                break;
  301.          case  ME_UMH:
  302.                x4->params.analyse.i_me_method = XAVS_ME_UMH;
  303.                break;
  304.          case  ME_FULL:
  305.                x4->params.analyse.i_me_method = XAVS_ME_ESA;
  306.                break;
  307.          case  ME_TESA:
  308.                x4->params.analyse.i_me_method = XAVS_ME_TESA;
  309.                break;
  310.          default:
  311.                x4->params.analyse.i_me_method = XAVS_ME_HEX;
  312.     }
  313.  
  314.     x4->params.analyse.i_me_range = avctx->me_range;
  315.     x4->params.analyse.i_subpel_refine    = avctx->me_subpel_quality;
  316.  
  317.     x4->params.analyse.b_chroma_me        = avctx->me_cmp & FF_CMP_CHROMA;
  318.     /* AVS P2 only enables 8x8 transform */
  319.     x4->params.analyse.b_transform_8x8    = 1; //avctx->flags2 & CODEC_FLAG2_8X8DCT;
  320.  
  321.     x4->params.analyse.i_trellis          = avctx->trellis;
  322.     x4->params.analyse.i_noise_reduction  = avctx->noise_reduction;
  323.  
  324.     if (avctx->level > 0)
  325.         x4->params.i_level_idc = avctx->level;
  326.  
  327.     x4->params.rc.f_rate_tolerance =
  328.         (float)avctx->bit_rate_tolerance/avctx->bit_rate;
  329.  
  330.     if ((avctx->rc_buffer_size) &&
  331.         (avctx->rc_initial_buffer_occupancy <= avctx->rc_buffer_size)) {
  332.         x4->params.rc.f_vbv_buffer_init =
  333.             (float)avctx->rc_initial_buffer_occupancy / avctx->rc_buffer_size;
  334.     } else
  335.         x4->params.rc.f_vbv_buffer_init = 0.9;
  336.  
  337.     /* TAG:do we have MB tree RC method */
  338.     /* what is the RC method we are now using? Default NO */
  339.     x4->params.rc.f_ip_factor             = 1 / fabs(avctx->i_quant_factor);
  340.     x4->params.rc.f_pb_factor             = avctx->b_quant_factor;
  341.     x4->params.analyse.i_chroma_qp_offset = avctx->chromaoffset;
  342.  
  343.     x4->params.analyse.b_psnr = avctx->flags & CODEC_FLAG_PSNR;
  344.     x4->params.i_log_level    = XAVS_LOG_DEBUG;
  345.     x4->params.i_threads      = avctx->thread_count;
  346.     x4->params.b_interlaced   = avctx->flags & CODEC_FLAG_INTERLACED_DCT;
  347.  
  348.     if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER)
  349.         x4->params.b_repeat_headers = 0;
  350.  
  351.     x4->enc = xavs_encoder_open(&x4->params);
  352.     if (!x4->enc)
  353.         return -1;
  354.  
  355.     if (!(x4->pts_buffer = av_mallocz((avctx->max_b_frames+1) * sizeof(*x4->pts_buffer))))
  356.         return AVERROR(ENOMEM);
  357.  
  358.     avctx->coded_frame = &x4->out_pic;
  359.     /* TAG: Do we have GLOBAL HEADER in AVS */
  360.     /* We Have PPS and SPS in AVS */
  361.     if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) {
  362.         xavs_nal_t *nal;
  363.         int nnal, s, i, size;
  364.         uint8_t *p;
  365.  
  366.         s = xavs_encoder_headers(x4->enc, &nal, &nnal);
  367.  
  368.         avctx->extradata = p = av_malloc(s);
  369.         for (i = 0; i < nnal; i++) {
  370.             /* Don't put the SEI in extradata. */
  371.             if (nal[i].i_type == NAL_SEI) {
  372.                 x4->sei = av_malloc( 5 + nal[i].i_payload * 4 / 3 );
  373.                 if (xavs_nal_encode(x4->sei, &x4->sei_size, 1, nal + i) < 0)
  374.                     return -1;
  375.  
  376.                 continue;
  377.             }
  378.             size = xavs_nal_encode(p, &s, 1, nal + i);
  379.             if (size < 0)
  380.                 return -1;
  381.             p += size;
  382.         }
  383.         avctx->extradata_size = p - avctx->extradata;
  384.     }
  385.     return 0;
  386. }
  387.  
  388. #define OFFSET(x) offsetof(XavsContext, x)
  389. #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
  390. static const AVOption options[] = {
  391.     { "crf",           "Select the quality for constant quality mode",    OFFSET(crf),           AV_OPT_TYPE_FLOAT,  {.dbl = -1 }, -1, FLT_MAX, VE },
  392.     { "qp",            "Constant quantization parameter rate control method",OFFSET(cqp),        AV_OPT_TYPE_INT,    {.i64 = -1 }, -1, INT_MAX, VE },
  393.     { "b-bias",        "Influences how often B-frames are used",          OFFSET(b_bias),        AV_OPT_TYPE_INT,    {.i64 = INT_MIN}, INT_MIN, INT_MAX, VE },
  394.     { "cplxblur",      "Reduce fluctuations in QP (before curve compression)", OFFSET(cplxblur), AV_OPT_TYPE_FLOAT,  {.dbl = -1 }, -1, FLT_MAX, VE},
  395.     { "direct-pred",   "Direct MV prediction mode",                       OFFSET(direct_pred),   AV_OPT_TYPE_INT,    {.i64 = -1 }, -1, INT_MAX, VE, "direct-pred" },
  396.     { "none",          NULL,      0,    AV_OPT_TYPE_CONST, { .i64 = XAVS_DIRECT_PRED_NONE },     0, 0, VE, "direct-pred" },
  397.     { "spatial",       NULL,      0,    AV_OPT_TYPE_CONST, { .i64 = XAVS_DIRECT_PRED_SPATIAL },  0, 0, VE, "direct-pred" },
  398.     { "temporal",      NULL,      0,    AV_OPT_TYPE_CONST, { .i64 = XAVS_DIRECT_PRED_TEMPORAL }, 0, 0, VE, "direct-pred" },
  399.     { "auto",          NULL,      0,    AV_OPT_TYPE_CONST, { .i64 = XAVS_DIRECT_PRED_AUTO },     0, 0, VE, "direct-pred" },
  400.     { "aud",           "Use access unit delimiters.",                     OFFSET(aud),           AV_OPT_TYPE_INT,    {.i64 = -1 }, -1, 1, VE},
  401.     { "mbtree",        "Use macroblock tree ratecontrol.",                OFFSET(mbtree),        AV_OPT_TYPE_INT,    {.i64 = -1 }, -1, 1, VE},
  402.     { "mixed-refs",    "One reference per partition, as opposed to one reference per macroblock", OFFSET(mixed_refs), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 1, VE },
  403.     { "fast-pskip",    NULL,                                              OFFSET(fast_pskip),    AV_OPT_TYPE_INT,    {.i64 = -1 }, -1, 1, VE},
  404.     { NULL },
  405. };
  406.  
  407. static const AVClass xavs_class = {
  408.     .class_name = "libxavs",
  409.     .item_name  = av_default_item_name,
  410.     .option     = options,
  411.     .version    = LIBAVUTIL_VERSION_INT,
  412. };
  413.  
  414. static const AVCodecDefault xavs_defaults[] = {
  415.     { "b",                "0" },
  416.     { NULL },
  417. };
  418.  
  419. AVCodec ff_libxavs_encoder = {
  420.     .name           = "libxavs",
  421.     .long_name      = NULL_IF_CONFIG_SMALL("libxavs Chinese AVS (Audio Video Standard)"),
  422.     .type           = AVMEDIA_TYPE_VIDEO,
  423.     .id             = AV_CODEC_ID_CAVS,
  424.     .priv_data_size = sizeof(XavsContext),
  425.     .init           = XAVS_init,
  426.     .encode2        = XAVS_frame,
  427.     .close          = XAVS_close,
  428.     .capabilities   = CODEC_CAP_DELAY | CODEC_CAP_AUTO_THREADS,
  429.     .pix_fmts       = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE },
  430.     .priv_class     = &xavs_class,
  431.     .defaults       = xavs_defaults,
  432. };
  433.