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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 "libavutil/buffer.h"
#include "libavutil/mem.h"
#include "codec_internal.h"
#include "encode.h"
#include "libwebpenc_common.h"
#include <webp/mux.h>
typedef struct LibWebPAnimContext {
LibWebPContextCommon cc;
WebPAnimEncoder *enc; // the main AnimEncoder object
int64_t first_frame_pts; // pts of the first encoded frame.
int64_t end_pts; // pts + duration of the last frame
void *first_frame_opaque;
AVBufferRef *first_frame_opaque_ref;
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 = { { 0 } };
WebPAnimEncoderOptionsInit(&enc_options);
enc_options.verbose = av_log_get_level() >= AV_LOG_VERBOSE;
// 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->first_frame_pts = AV_NOPTS_VALUE;
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_get_encode_buffer(avctx, pkt, assembled_data.size, 0);
if (ret < 0) {
WebPDataClear(&assembled_data);
return ret;
}
memcpy(pkt->data, assembled_data.bytes, assembled_data.size);
WebPDataClear(&assembled_data);
s->done = 1;
pkt->pts = s->first_frame_pts;
if (pkt->pts != AV_NOPTS_VALUE && s->end_pts > pkt->pts)
pkt->duration = s->end_pts - pkt->pts;
if (avctx->flags & AV_CODEC_FLAG_COPY_OPAQUE) {
pkt->opaque = s->first_frame_opaque;
pkt->opaque_ref = s->first_frame_opaque_ref;
s->first_frame_opaque_ref = NULL;
}
*got_packet = 1;
return 0;
} else {
WebPDataClear(&assembled_data);
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;
}
if (!avctx->frame_num) {
s->first_frame_pts = frame->pts;
if (avctx->flags & AV_CODEC_FLAG_COPY_OPAQUE) {
s->first_frame_opaque = frame->opaque;
ret = av_buffer_replace(&s->first_frame_opaque_ref, frame->opaque_ref);
if (ret < 0)
goto end;
}
}
if (frame->pts != AV_NOPTS_VALUE)
s->end_pts = frame->pts + frame->duration;
ret = 0;
*got_packet = 0;
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);
av_buffer_unref(&s->first_frame_opaque_ref);
return 0;
}
const FFCodec ff_libwebp_anim_encoder = {
.p.name = "libwebp_anim",
CODEC_LONG_NAME("libwebp WebP image"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_WEBP,
.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY |
AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE,
CODEC_PIXFMTS_ARRAY(ff_libwebpenc_pix_fmts),
.color_ranges = AVCOL_RANGE_MPEG,
.p.priv_class = &ff_libwebpenc_class,
.p.wrapper_name = "libwebp",
.caps_internal = FF_CODEC_CAP_NOT_INIT_THREADSAFE,
.priv_data_size = sizeof(LibWebPAnimContext),
.defaults = ff_libwebp_defaults,
.init = libwebp_anim_encode_init,
FF_CODEC_ENCODE_CB(libwebp_anim_encode_frame),
.close = libwebp_anim_encode_close,
};
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