2 * WebP encoding support via libwebp
3 * Copyright (c) 2015 Urvang Joshi
5 * This file is part of FFmpeg.
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.
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.
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
24 * WebP encoder using libwebp (WebPAnimEncoder API)
28 #include "libwebpenc_common.h"
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
39 static av_cold int libwebp_anim_encode_init(AVCodecContext *avctx)
41 int ret = ff_libwebp_encode_init_common(avctx);
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);
49 return AVERROR(EINVAL);
50 s->prev_frame_pts = -1;
56 static int libwebp_anim_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
57 const AVFrame *frame, int *got_packet) {
58 LibWebPAnimContext *s = avctx->priv_data;
62 if (s->done) { // Second flush: return empty package to denote finish.
65 } else { // First flush: assemble bitstream and return it.
66 WebPData assembled_data = { 0 };
67 ret = WebPAnimEncoderAssemble(s->enc, &assembled_data);
69 ret = ff_alloc_packet(pkt, assembled_data.size);
72 memcpy(pkt->data, assembled_data.bytes, assembled_data.size);
74 pkt->flags |= AV_PKT_FLAG_KEY;
75 pkt->pts = pkt->dts = s->prev_frame_pts + 1;
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);
87 WebPPicture *pic = NULL;
88 AVFrame *alt_frame = NULL;
89 ret = ff_libwebp_get_frame(avctx, &s->cc, frame, &alt_frame, &pic);
94 avctx->time_base.num * frame->pts * 1000 / avctx->time_base.den;
95 ret = WebPAnimEncoderAdd(s->enc, pic, timestamp_ms, &s->cc.config);
97 av_log(avctx, AV_LOG_ERROR,
98 "Encoding WebP frame failed with error: %d\n",
100 ret = ff_libwebp_error_to_averror(pic->error_code);
104 pkt->pts = pkt->dts = frame->pts;
105 s->prev_frame_pts = frame->pts; // Save for next frame.
110 WebPPictureFree(pic);
112 av_frame_free(&alt_frame);
117 static int libwebp_anim_encode_close(AVCodecContext *avctx)
119 LibWebPAnimContext *s = avctx->priv_data;
120 av_frame_free(&s->cc.ref);
121 WebPAnimEncoderDelete(s->enc);
126 static const AVClass class = {
127 .class_name = "libwebp_anim",
128 .item_name = av_default_item_name,
130 .version = LIBAVUTIL_VERSION_INT,
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 = CODEC_CAP_DELAY,
143 .pix_fmts = (const enum AVPixelFormat[]) {
145 AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVA420P,
148 .priv_class = &class,
149 .defaults = libwebp_defaults,