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/*
* WebP encoding support via libwebp
* Copyright (c) 2015 Urvang Joshi
*
* 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 (WebPAnimEncoder API)
*/
#include "config.h"
#include "libwebpenc_common.h"
#include <webp/mux.h>
typedef struct LibWebPAnimContext {
LibWebPContextCommon cc;
WebPAnimEncoder *enc; // the main AnimEncoder object
int64_t prev_frame_pts; // pts of the previously encoded frame.
int done; // If true, we have assembled the bitstream already
} LibWebPAnimContext;
static av_cold int libwebp_anim_encode_init(AVCodecContext *avctx)
{
int ret = ff_libwebp_encode_init_common(avctx);
if (!ret) {
LibWebPAnimContext *s = avctx->priv_data;
WebPAnimEncoderOptions enc_options;
WebPAnimEncoderOptionsInit(&enc_options);
// TODO(urvang): Expose some options on command-line perhaps.
s->enc = WebPAnimEncoderNew(avctx->width, avctx->height, &enc_options);
if (!s->enc)
return AVERROR(EINVAL);
s->prev_frame_pts = -1;
s->done = 0;
}
return ret;
}
static int libwebp_anim_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
const AVFrame *frame, int *got_packet) {
LibWebPAnimContext *s = avctx->priv_data;
int ret;
if (!frame) {
if (s->done) { // Second flush: return empty package to denote finish.
*got_packet = 0;
return 0;
} else { // First flush: assemble bitstream and return it.
WebPData assembled_data = { 0 };
ret = WebPAnimEncoderAssemble(s->enc, &assembled_data);
if (ret) {
ret = ff_alloc_packet(pkt, assembled_data.size);
if (ret < 0)
return ret;
memcpy(pkt->data, assembled_data.bytes, assembled_data.size);
s->done = 1;
pkt->flags |= AV_PKT_FLAG_KEY;
pkt->pts = pkt->dts = s->prev_frame_pts + 1;
*got_packet = 1;
return 0;
} else {
av_log(s, AV_LOG_ERROR,
"WebPAnimEncoderAssemble() failed with error: %d\n",
VP8_ENC_ERROR_OUT_OF_MEMORY);
return AVERROR(ENOMEM);
}
}
} else {
int timestamp_ms;
WebPPicture *pic = NULL;
AVFrame *alt_frame = NULL;
ret = ff_libwebp_get_frame(avctx, &s->cc, frame, &alt_frame, &pic);
if (ret < 0)
goto end;
timestamp_ms =
avctx->time_base.num * frame->pts * 1000 / avctx->time_base.den;
ret = WebPAnimEncoderAdd(s->enc, pic, timestamp_ms, &s->cc.config);
if (!ret) {
av_log(avctx, AV_LOG_ERROR,
"Encoding WebP frame failed with error: %d\n",
pic->error_code);
ret = ff_libwebp_error_to_averror(pic->error_code);
goto end;
}
pkt->pts = pkt->dts = frame->pts;
s->prev_frame_pts = frame->pts; // Save for next frame.
ret = 0;
*got_packet = 1;
end:
WebPPictureFree(pic);
av_freep(&pic);
av_frame_free(&alt_frame);
return ret;
}
}
static int libwebp_anim_encode_close(AVCodecContext *avctx)
{
LibWebPAnimContext *s = avctx->priv_data;
av_frame_free(&s->cc.ref);
WebPAnimEncoderDelete(s->enc);
return 0;
}
static const AVClass class = {
.class_name = "libwebp_anim",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
AVCodec ff_libwebp_anim_encoder = {
.name = "libwebp_anim",
.long_name = NULL_IF_CONFIG_SMALL("libwebp WebP image"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_WEBP,
.priv_data_size = sizeof(LibWebPAnimContext),
.init = libwebp_anim_encode_init,
.encode2 = libwebp_anim_encode_frame,
.close = libwebp_anim_encode_close,
.capabilities = CODEC_CAP_DELAY,
.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,
};
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