diff options
Diffstat (limited to 'libavcodec/libwebpenc_animencoder.c')
| -rw-r--r-- | libavcodec/libwebpenc_animencoder.c | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/libavcodec/libwebpenc_animencoder.c b/libavcodec/libwebpenc_animencoder.c new file mode 100644 index 0000000..7f35a0b --- /dev/null +++ b/libavcodec/libwebpenc_animencoder.c @@ -0,0 +1,152 @@ +/* + * 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 = { { 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->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, + .wrapper_name = "libwebp", +}; |
