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  1. /*
  2.  * WebP encoding support via libwebp
  3.  * Copyright (c) 2013 Justin Ruggles <justin.ruggles@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. /**
  23.  * @file
  24.  * WebP encoder using libwebp (WebPEncode API)
  25.  */
  26.  
  27. #include "libwebpenc_common.h"
  28.  
  29. typedef LibWebPContextCommon LibWebPContext;
  30.  
  31. static av_cold int libwebp_encode_init(AVCodecContext *avctx)
  32. {
  33.     return ff_libwebp_encode_init_common(avctx);
  34. }
  35.  
  36. static int libwebp_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
  37.                                 const AVFrame *frame, int *got_packet)
  38. {
  39.     LibWebPContext *s  = avctx->priv_data;
  40.     WebPPicture *pic = NULL;
  41.     AVFrame *alt_frame = NULL;
  42.     WebPMemoryWriter mw = { 0 };
  43.  
  44.     int ret = ff_libwebp_get_frame(avctx, s, frame, &alt_frame, &pic);
  45.     if (ret < 0)
  46.         goto end;
  47.  
  48.     WebPMemoryWriterInit(&mw);
  49.     pic->custom_ptr = &mw;
  50.     pic->writer     = WebPMemoryWrite;
  51.  
  52.     ret = WebPEncode(&s->config, pic);
  53.     if (!ret) {
  54.         av_log(avctx, AV_LOG_ERROR, "WebPEncode() failed with error: %d\n",
  55.                pic->error_code);
  56.         ret = ff_libwebp_error_to_averror(pic->error_code);
  57.         goto end;
  58.     }
  59.  
  60.     ret = ff_alloc_packet2(avctx, pkt, mw.size, mw.size);
  61.     if (ret < 0)
  62.         goto end;
  63.     memcpy(pkt->data, mw.mem, mw.size);
  64.  
  65.     pkt->flags |= AV_PKT_FLAG_KEY;
  66.     *got_packet = 1;
  67.  
  68. end:
  69. #if (WEBP_ENCODER_ABI_VERSION > 0x0203)
  70.     WebPMemoryWriterClear(&mw);
  71. #else
  72.     free(mw.mem); /* must use free() according to libwebp documentation */
  73. #endif
  74.     WebPPictureFree(pic);
  75.     av_freep(&pic);
  76.     av_frame_free(&alt_frame);
  77.  
  78.     return ret;
  79. }
  80.  
  81. static int libwebp_encode_close(AVCodecContext *avctx)
  82. {
  83.     LibWebPContextCommon *s  = avctx->priv_data;
  84.     av_frame_free(&s->ref);
  85.  
  86.     return 0;
  87. }
  88.  
  89. static const AVClass class = {
  90.     .class_name = "libwebp",
  91.     .item_name  = av_default_item_name,
  92.     .option     = options,
  93.     .version    = LIBAVUTIL_VERSION_INT,
  94. };
  95.  
  96. AVCodec ff_libwebp_encoder = {
  97.     .name           = "libwebp",
  98.     .long_name      = NULL_IF_CONFIG_SMALL("libwebp WebP image"),
  99.     .type           = AVMEDIA_TYPE_VIDEO,
  100.     .id             = AV_CODEC_ID_WEBP,
  101.     .priv_data_size = sizeof(LibWebPContext),
  102.     .init           = libwebp_encode_init,
  103.     .encode2        = libwebp_encode_frame,
  104.     .close          = libwebp_encode_close,
  105.     .pix_fmts       = (const enum AVPixelFormat[]) {
  106.         AV_PIX_FMT_RGB32,
  107.         AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVA420P,
  108.         AV_PIX_FMT_NONE
  109.     },
  110.     .priv_class     = &class,
  111.     .defaults       = libwebp_defaults,
  112. };
  113.