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  1. /*
  2.  * OpenH264 video encoder
  3.  * Copyright (C) 2014 Martin Storsjo
  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 <wels/codec_api.h>
  23. #include <wels/codec_ver.h>
  24.  
  25. #include "libavutil/attributes.h"
  26. #include "libavutil/common.h"
  27. #include "libavutil/opt.h"
  28. #include "libavutil/intreadwrite.h"
  29. #include "libavutil/mathematics.h"
  30.  
  31. #include "avcodec.h"
  32. #include "internal.h"
  33.  
  34. typedef struct SVCContext {
  35.     const AVClass *av_class;
  36.     ISVCEncoder *encoder;
  37.     int slice_mode;
  38.     int loopfilter;
  39.     char *profile;
  40. } SVCContext;
  41.  
  42. #define OPENH264_VER_AT_LEAST(maj, min) \
  43.     ((OPENH264_MAJOR  > (maj)) || \
  44.      (OPENH264_MAJOR == (maj) && OPENH264_MINOR >= (min)))
  45.  
  46. #define OFFSET(x) offsetof(SVCContext, x)
  47. #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
  48. static const AVOption options[] = {
  49.     { "slice_mode", "Slice mode", OFFSET(slice_mode), AV_OPT_TYPE_INT, { .i64 = SM_AUTO_SLICE }, SM_SINGLE_SLICE, SM_RESERVED, VE, "slice_mode" },
  50.     { "fixed", "A fixed number of slices", 0, AV_OPT_TYPE_CONST, { .i64 = SM_FIXEDSLCNUM_SLICE }, 0, 0, VE, "slice_mode" },
  51.     { "rowmb", "One slice per row of macroblocks", 0, AV_OPT_TYPE_CONST, { .i64 = SM_ROWMB_SLICE }, 0, 0, VE, "slice_mode" },
  52.     { "auto", "Automatic number of slices according to number of threads", 0, AV_OPT_TYPE_CONST, { .i64 = SM_AUTO_SLICE }, 0, 0, VE, "slice_mode" },
  53.     { "loopfilter", "Enable loop filter", OFFSET(loopfilter), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, VE },
  54.     { "profile", "Set profile restrictions", OFFSET(profile), AV_OPT_TYPE_STRING, { 0 }, 0, 0, VE },
  55.     { NULL }
  56. };
  57.  
  58. static const AVClass class = {
  59.     "libopenh264enc", av_default_item_name, options, LIBAVUTIL_VERSION_INT
  60. };
  61.  
  62. static av_cold int svc_encode_close(AVCodecContext *avctx)
  63. {
  64.     SVCContext *s = avctx->priv_data;
  65.  
  66.     if (s->encoder)
  67.         WelsDestroySVCEncoder(s->encoder);
  68.     return 0;
  69. }
  70.  
  71. static av_cold int svc_encode_init(AVCodecContext *avctx)
  72. {
  73.     SVCContext *s = avctx->priv_data;
  74.     SEncParamExt param = { 0 };
  75.     int err = AVERROR_UNKNOWN;
  76.  
  77.     // Mingw GCC < 4.7 on x86_32 uses an incorrect/buggy ABI for the WelsGetCodecVersion
  78.     // function (for functions returning larger structs), thus skip the check in those
  79.     // configurations.
  80. #if !defined(_WIN32) || !defined(__GNUC__) || !ARCH_X86_32 || AV_GCC_VERSION_AT_LEAST(4, 7)
  81.     OpenH264Version libver = WelsGetCodecVersion();
  82.     if (memcmp(&libver, &g_stCodecVersion, sizeof(libver))) {
  83.         av_log(avctx, AV_LOG_ERROR, "Incorrect library version loaded\n");
  84.         return AVERROR(EINVAL);
  85.     }
  86. #endif
  87.  
  88.     if (WelsCreateSVCEncoder(&s->encoder)) {
  89.         av_log(avctx, AV_LOG_ERROR, "Unable to create encoder\n");
  90.         return AVERROR_UNKNOWN;
  91.     }
  92.  
  93.     (*s->encoder)->GetDefaultParams(s->encoder, &param);
  94.  
  95.     param.fMaxFrameRate              = 1/av_q2d(avctx->time_base);
  96.     param.iPicWidth                  = avctx->width;
  97.     param.iPicHeight                 = avctx->height;
  98.     param.iTargetBitrate             = avctx->bit_rate;
  99.     param.iMaxBitrate                = FFMAX(avctx->rc_max_rate, avctx->bit_rate);
  100.     param.iRCMode                    = RC_QUALITY_MODE;
  101.     param.iTemporalLayerNum          = 1;
  102.     param.iSpatialLayerNum           = 1;
  103.     param.bEnableDenoise             = 0;
  104.     param.bEnableBackgroundDetection = 1;
  105.     param.bEnableAdaptiveQuant       = 1;
  106.     param.bEnableFrameSkip           = 0;
  107.     param.bEnableLongTermReference   = 0;
  108.     param.iLtrMarkPeriod             = 30;
  109.     param.uiIntraPeriod              = avctx->gop_size;
  110. #if OPENH264_VER_AT_LEAST(1, 4)
  111.     param.eSpsPpsIdStrategy          = CONSTANT_ID;
  112. #else
  113.     param.bEnableSpsPpsIdAddition    = 0;
  114. #endif
  115.     param.bPrefixNalAddingCtrl       = 0;
  116.     param.iLoopFilterDisableIdc      = !s->loopfilter;
  117.     param.iEntropyCodingModeFlag     = 0;
  118.     param.iMultipleThreadIdc         = avctx->thread_count;
  119.     if (s->profile && !strcmp(s->profile, "main"))
  120.         param.iEntropyCodingModeFlag = 1;
  121.     else if (!s->profile && avctx->coder_type == FF_CODER_TYPE_AC)
  122.         param.iEntropyCodingModeFlag = 1;
  123.  
  124.     param.sSpatialLayers[0].iVideoWidth         = param.iPicWidth;
  125.     param.sSpatialLayers[0].iVideoHeight        = param.iPicHeight;
  126.     param.sSpatialLayers[0].fFrameRate          = param.fMaxFrameRate;
  127.     param.sSpatialLayers[0].iSpatialBitrate     = param.iTargetBitrate;
  128.     param.sSpatialLayers[0].iMaxSpatialBitrate  = param.iMaxBitrate;
  129.  
  130.     if (avctx->slices > 1)
  131.         s->slice_mode = SM_FIXEDSLCNUM_SLICE;
  132.     param.sSpatialLayers[0].sSliceCfg.uiSliceMode               = s->slice_mode;
  133.     param.sSpatialLayers[0].sSliceCfg.sSliceArgument.uiSliceNum = avctx->slices;
  134.  
  135.     if ((*s->encoder)->InitializeExt(s->encoder, &param) != cmResultSuccess) {
  136.         av_log(avctx, AV_LOG_ERROR, "Initialize failed\n");
  137.         goto fail;
  138.     }
  139.  
  140.     if (avctx->flags & AV_CODEC_FLAG_GLOBAL_HEADER) {
  141.         SFrameBSInfo fbi = { 0 };
  142.         int i, size = 0;
  143.         (*s->encoder)->EncodeParameterSets(s->encoder, &fbi);
  144.         for (i = 0; i < fbi.sLayerInfo[0].iNalCount; i++)
  145.             size += fbi.sLayerInfo[0].pNalLengthInByte[i];
  146.         avctx->extradata = av_mallocz(size + AV_INPUT_BUFFER_PADDING_SIZE);
  147.         if (!avctx->extradata) {
  148.             err = AVERROR(ENOMEM);
  149.             goto fail;
  150.         }
  151.         avctx->extradata_size = size;
  152.         memcpy(avctx->extradata, fbi.sLayerInfo[0].pBsBuf, size);
  153.     }
  154.  
  155.     return 0;
  156.  
  157. fail:
  158.     svc_encode_close(avctx);
  159.     return err;
  160. }
  161.  
  162. static int svc_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
  163.                             const AVFrame *frame, int *got_packet)
  164. {
  165.     SVCContext *s = avctx->priv_data;
  166.     SFrameBSInfo fbi = { 0 };
  167.     int i, ret;
  168.     int encoded;
  169.     SSourcePicture sp = { 0 };
  170.     int size = 0, layer, first_layer = 0;
  171.     int layer_size[MAX_LAYER_NUM_OF_FRAME] = { 0 };
  172.  
  173.     sp.iColorFormat = videoFormatI420;
  174.     for (i = 0; i < 3; i++) {
  175.         sp.iStride[i] = frame->linesize[i];
  176.         sp.pData[i]   = frame->data[i];
  177.     }
  178.     sp.iPicWidth  = avctx->width;
  179.     sp.iPicHeight = avctx->height;
  180.  
  181.     encoded = (*s->encoder)->EncodeFrame(s->encoder, &sp, &fbi);
  182.     if (encoded != cmResultSuccess) {
  183.         av_log(avctx, AV_LOG_ERROR, "EncodeFrame failed\n");
  184.         return AVERROR_UNKNOWN;
  185.     }
  186.     if (fbi.eFrameType == videoFrameTypeSkip) {
  187.         av_log(avctx, AV_LOG_DEBUG, "frame skipped\n");
  188.         return 0;
  189.     }
  190.     first_layer = 0;
  191.     // Normal frames are returned with one single layer, while IDR
  192.     // frames have two layers, where the first layer contains the SPS/PPS.
  193.     // If using global headers, don't include the SPS/PPS in the returned
  194.     // packet - thus, only return one layer.
  195.     if (avctx->flags & AV_CODEC_FLAG_GLOBAL_HEADER)
  196.         first_layer = fbi.iLayerNum - 1;
  197.  
  198.     for (layer = first_layer; layer < fbi.iLayerNum; layer++) {
  199.         for (i = 0; i < fbi.sLayerInfo[layer].iNalCount; i++)
  200.             layer_size[layer] += fbi.sLayerInfo[layer].pNalLengthInByte[i];
  201.         size += layer_size[layer];
  202.     }
  203.     av_log(avctx, AV_LOG_DEBUG, "%d slices\n", fbi.sLayerInfo[fbi.iLayerNum - 1].iNalCount);
  204.  
  205.     if ((ret = ff_alloc_packet2(avctx, avpkt, size, size))) {
  206.         av_log(avctx, AV_LOG_ERROR, "Error getting output packet\n");
  207.         return ret;
  208.     }
  209.     size = 0;
  210.     for (layer = first_layer; layer < fbi.iLayerNum; layer++) {
  211.         memcpy(avpkt->data + size, fbi.sLayerInfo[layer].pBsBuf, layer_size[layer]);
  212.         size += layer_size[layer];
  213.     }
  214.     avpkt->pts = frame->pts;
  215.     if (fbi.eFrameType == videoFrameTypeIDR)
  216.         avpkt->flags |= AV_PKT_FLAG_KEY;
  217.     *got_packet = 1;
  218.     return 0;
  219. }
  220.  
  221. AVCodec ff_libopenh264_encoder = {
  222.     .name           = "libopenh264",
  223.     .long_name      = NULL_IF_CONFIG_SMALL("OpenH264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10"),
  224.     .type           = AVMEDIA_TYPE_VIDEO,
  225.     .id             = AV_CODEC_ID_H264,
  226.     .priv_data_size = sizeof(SVCContext),
  227.     .init           = svc_encode_init,
  228.     .encode2        = svc_encode_frame,
  229.     .close          = svc_encode_close,
  230.     .capabilities   = AV_CODEC_CAP_AUTO_THREADS,
  231.     .pix_fmts       = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV420P,
  232.                                                     AV_PIX_FMT_NONE },
  233.     .priv_class     = &class,
  234. };
  235.