/* * 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_packet2(avctx, pkt, assembled_data.size, 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 = AV_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, };