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 = { { 0 } };
45 WebPAnimEncoderOptionsInit(&enc_options);
46 enc_options.verbose = av_log_get_level() >= AV_LOG_VERBOSE;
47 // TODO(urvang): Expose some options on command-line perhaps.
48 s->enc = WebPAnimEncoderNew(avctx->width, avctx->height, &enc_options);
50 return AVERROR(EINVAL);
51 s->prev_frame_pts = -1;
57 static int libwebp_anim_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
58 const AVFrame *frame, int *got_packet) {
59 LibWebPAnimContext *s = avctx->priv_data;
63 if (s->done) { // Second flush: return empty package to denote finish.
66 } else { // First flush: assemble bitstream and return it.
67 WebPData assembled_data = { 0 };
68 ret = WebPAnimEncoderAssemble(s->enc, &assembled_data);
70 ret = ff_alloc_packet2(avctx, pkt, assembled_data.size, assembled_data.size);
73 memcpy(pkt->data, assembled_data.bytes, assembled_data.size);
75 pkt->flags |= AV_PKT_FLAG_KEY;
76 pkt->pts = pkt->dts = s->prev_frame_pts + 1;
80 av_log(s, AV_LOG_ERROR,
81 "WebPAnimEncoderAssemble() failed with error: %d\n",
82 VP8_ENC_ERROR_OUT_OF_MEMORY);
83 return AVERROR(ENOMEM);
88 WebPPicture *pic = NULL;
89 AVFrame *alt_frame = NULL;
90 ret = ff_libwebp_get_frame(avctx, &s->cc, frame, &alt_frame, &pic);
95 avctx->time_base.num * frame->pts * 1000 / avctx->time_base.den;
96 ret = WebPAnimEncoderAdd(s->enc, pic, timestamp_ms, &s->cc.config);
98 av_log(avctx, AV_LOG_ERROR,
99 "Encoding WebP frame failed with error: %d\n",
101 ret = ff_libwebp_error_to_averror(pic->error_code);
105 pkt->pts = pkt->dts = frame->pts;
106 s->prev_frame_pts = frame->pts; // Save for next frame.
111 WebPPictureFree(pic);
113 av_frame_free(&alt_frame);
118 static int libwebp_anim_encode_close(AVCodecContext *avctx)
120 LibWebPAnimContext *s = avctx->priv_data;
121 av_frame_free(&s->cc.ref);
122 WebPAnimEncoderDelete(s->enc);
127 static const AVClass class = {
128 .class_name = "libwebp_anim",
129 .item_name = av_default_item_name,
131 .version = LIBAVUTIL_VERSION_INT,
134 AVCodec ff_libwebp_anim_encoder = {
135 .name = "libwebp_anim",
136 .long_name = NULL_IF_CONFIG_SMALL("libwebp WebP image"),
137 .type = AVMEDIA_TYPE_VIDEO,
138 .id = AV_CODEC_ID_WEBP,
139 .priv_data_size = sizeof(LibWebPAnimContext),
140 .init = libwebp_anim_encode_init,
141 .encode2 = libwebp_anim_encode_frame,
142 .close = libwebp_anim_encode_close,
143 .capabilities = AV_CODEC_CAP_DELAY,
144 .pix_fmts = (const enum AVPixelFormat[]) {
146 AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVA420P,
149 .priv_class = &class,
150 .defaults = libwebp_defaults,