/*
  * WebP encoding support via libwebp
  * Copyright (c) 2013 Justin Ruggles <justin.ruggles@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
  */
 
 /**
  * @file

  * WebP encoder using libwebp (WebPEncode API)

  */
 

 #include "libwebpenc_common.h"

 typedef LibWebPContextCommon LibWebPContext;

 
 static av_cold int libwebp_encode_init(AVCodecContext *avctx)
 {

     return ff_libwebp_encode_init_common(avctx);

 }
 
 static int libwebp_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
                                 const AVFrame *frame, int *got_packet)
 {
     LibWebPContext *s  = avctx->priv_data;
     WebPPicture *pic = NULL;

     AVFrame *alt_frame = NULL;

     WebPMemoryWriter mw = { 0 };
 

     int ret = ff_libwebp_get_frame(avctx, s, frame, &alt_frame, &pic);
     if (ret < 0)

         goto end;
 
     WebPMemoryWriterInit(&mw);
     pic->custom_ptr = &mw;
     pic->writer     = WebPMemoryWrite;
 
     ret = WebPEncode(&s->config, pic);
     if (!ret) {
         av_log(avctx, AV_LOG_ERROR, "WebPEncode() failed with error: %d\n",
                pic->error_code);

         ret = ff_libwebp_error_to_averror(pic->error_code);

         goto end;
     }
 

     ret = ff_alloc_packet2(avctx, pkt, mw.size, mw.size);

     if (ret < 0)
         goto end;
     memcpy(pkt->data, mw.mem, mw.size);
 
     pkt->flags |= AV_PKT_FLAG_KEY;
     *got_packet = 1;
 
 end:

 #if (WEBP_ENCODER_ABI_VERSION > 0x0203)
     WebPMemoryWriterClear(&mw);
 #else

     free(mw.mem); /* must use free() according to libwebp documentation */

 #endif

     WebPPictureFree(pic);
     av_freep(&pic);
     av_frame_free(&alt_frame);
 
     return ret;
 }
 

 static int libwebp_encode_close(AVCodecContext *avctx)
 {

     LibWebPContextCommon *s  = avctx->priv_data;
     av_frame_free(&s->ref);
 
     return 0;

 }
 

 static const AVClass class = {
     .class_name = "libwebp",
     .item_name  = av_default_item_name,
     .option     = options,
     .version    = LIBAVUTIL_VERSION_INT,
 };
 

 AVCodec ff_libwebp_encoder = {
     .name           = "libwebp",
     .long_name      = NULL_IF_CONFIG_SMALL("libwebp WebP image"),
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = AV_CODEC_ID_WEBP,
     .priv_data_size = sizeof(LibWebPContext),
     .init           = libwebp_encode_init,
     .encode2        = libwebp_encode_frame,

     .close          = libwebp_encode_close,

     .pix_fmts       = (const enum AVPixelFormat[]) {
         AV_PIX_FMT_RGB32,
         AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVA420P,
         AV_PIX_FMT_NONE
     },
     .priv_class     = &class,
     .defaults       = libwebp_defaults,
 };