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  1. /*
  2.  * WebP encoding support via libwebp
  3.  * Copyright (c) 2015 Urvang Joshi
  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 (WebPAnimEncoder API)
  25.  */
  26.  
  27. #include "config.h"
  28. #include "libwebpenc_common.h"
  29.  
  30. #include <webp/mux.h>
  31.  
  32. typedef struct LibWebPAnimContext {
  33.     LibWebPContextCommon cc;
  34.     WebPAnimEncoder *enc;     // the main AnimEncoder object
  35.     int64_t prev_frame_pts;   // pts of the previously encoded frame.
  36.     int done;                 // If true, we have assembled the bitstream already
  37. } LibWebPAnimContext;
  38.  
  39. static av_cold int libwebp_anim_encode_init(AVCodecContext *avctx)
  40. {
  41.     int ret = ff_libwebp_encode_init_common(avctx);
  42.     if (!ret) {
  43.         LibWebPAnimContext *s = avctx->priv_data;
  44.         WebPAnimEncoderOptions enc_options;
  45.         WebPAnimEncoderOptionsInit(&enc_options);
  46.         // TODO(urvang): Expose some options on command-line perhaps.
  47.         s->enc = WebPAnimEncoderNew(avctx->width, avctx->height, &enc_options);
  48.         if (!s->enc)
  49.             return AVERROR(EINVAL);
  50.         s->prev_frame_pts = -1;
  51.         s->done = 0;
  52.     }
  53.     return ret;
  54. }
  55.  
  56. static int libwebp_anim_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
  57.                                      const AVFrame *frame, int *got_packet) {
  58.     LibWebPAnimContext *s = avctx->priv_data;
  59.     int ret;
  60.  
  61.     if (!frame) {
  62.         if (s->done) {  // Second flush: return empty package to denote finish.
  63.             *got_packet = 0;
  64.             return 0;
  65.         } else {  // First flush: assemble bitstream and return it.
  66.             WebPData assembled_data = { 0 };
  67.             ret = WebPAnimEncoderAssemble(s->enc, &assembled_data);
  68.             if (ret) {
  69.                 ret = ff_alloc_packet2(avctx, pkt, assembled_data.size, assembled_data.size);
  70.                 if (ret < 0)
  71.                     return ret;
  72.                 memcpy(pkt->data, assembled_data.bytes, assembled_data.size);
  73.                 s->done = 1;
  74.                 pkt->flags |= AV_PKT_FLAG_KEY;
  75.                 pkt->pts = pkt->dts = s->prev_frame_pts + 1;
  76.                 *got_packet = 1;
  77.                 return 0;
  78.             } else {
  79.                 av_log(s, AV_LOG_ERROR,
  80.                        "WebPAnimEncoderAssemble() failed with error: %d\n",
  81.                        VP8_ENC_ERROR_OUT_OF_MEMORY);
  82.                 return AVERROR(ENOMEM);
  83.             }
  84.         }
  85.     } else {
  86.         int timestamp_ms;
  87.         WebPPicture *pic = NULL;
  88.         AVFrame *alt_frame = NULL;
  89.         ret = ff_libwebp_get_frame(avctx, &s->cc, frame, &alt_frame, &pic);
  90.         if (ret < 0)
  91.             goto end;
  92.  
  93.         timestamp_ms =
  94.             avctx->time_base.num * frame->pts * 1000 / avctx->time_base.den;
  95.         ret = WebPAnimEncoderAdd(s->enc, pic, timestamp_ms, &s->cc.config);
  96.         if (!ret) {
  97.                 av_log(avctx, AV_LOG_ERROR,
  98.                        "Encoding WebP frame failed with error: %d\n",
  99.                    pic->error_code);
  100.             ret = ff_libwebp_error_to_averror(pic->error_code);
  101.             goto end;
  102.         }
  103.  
  104.         pkt->pts = pkt->dts = frame->pts;
  105.         s->prev_frame_pts = frame->pts;  // Save for next frame.
  106.         ret = 0;
  107.         *got_packet = 1;
  108.  
  109. end:
  110.         WebPPictureFree(pic);
  111.         av_freep(&pic);
  112.         av_frame_free(&alt_frame);
  113.         return ret;
  114.     }
  115. }
  116.  
  117. static int libwebp_anim_encode_close(AVCodecContext *avctx)
  118. {
  119.     LibWebPAnimContext *s = avctx->priv_data;
  120.     av_frame_free(&s->cc.ref);
  121.     WebPAnimEncoderDelete(s->enc);
  122.  
  123.     return 0;
  124. }
  125.  
  126. static const AVClass class = {
  127.     .class_name = "libwebp_anim",
  128.     .item_name  = av_default_item_name,
  129.     .option     = options,
  130.     .version    = LIBAVUTIL_VERSION_INT,
  131. };
  132.  
  133. AVCodec ff_libwebp_anim_encoder = {
  134.     .name           = "libwebp_anim",
  135.     .long_name      = NULL_IF_CONFIG_SMALL("libwebp WebP image"),
  136.     .type           = AVMEDIA_TYPE_VIDEO,
  137.     .id             = AV_CODEC_ID_WEBP,
  138.     .priv_data_size = sizeof(LibWebPAnimContext),
  139.     .init           = libwebp_anim_encode_init,
  140.     .encode2        = libwebp_anim_encode_frame,
  141.     .close          = libwebp_anim_encode_close,
  142.     .capabilities   = AV_CODEC_CAP_DELAY,
  143.     .pix_fmts       = (const enum AVPixelFormat[]) {
  144.         AV_PIX_FMT_RGB32,
  145.         AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVA420P,
  146.         AV_PIX_FMT_NONE
  147.     },
  148.     .priv_class     = &class,
  149.     .defaults       = libwebp_defaults,
  150. };
  151.