1/*
2 * WebP encoding support via libwebp
3 * Copyright (c) 2013 Justin Ruggles <justin.ruggles@gmail.com>
4 *
5 * This file is part of FFmpeg.
6 *
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.
11 *
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.
16 *
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
20 */
21
22/**
23 * @file
24 * WebP encoder using libwebp (WebPEncode API)
25 */
26
27#include "codec_internal.h"
28#include "encode.h"
29#include "libwebpenc_common.h"
30
31typedef LibWebPContextCommon LibWebPContext;
32
33static av_cold int libwebp_encode_init(AVCodecContext *avctx)
34{
35    return ff_libwebp_encode_init_common(avctx);
36}
37
38static int libwebp_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
39                                const AVFrame *frame, int *got_packet)
40{
41    LibWebPContext *s  = avctx->priv_data;
42    WebPPicture *pic = NULL;
43    AVFrame *alt_frame = NULL;
44    WebPMemoryWriter mw = { 0 };
45
46    int ret = ff_libwebp_get_frame(avctx, s, frame, &alt_frame, &pic);
47    if (ret < 0)
48        goto end;
49
50    WebPMemoryWriterInit(&mw);
51    pic->custom_ptr = &mw;
52    pic->writer     = WebPMemoryWrite;
53
54    ret = WebPEncode(&s->config, pic);
55    if (!ret) {
56        av_log(avctx, AV_LOG_ERROR, "WebPEncode() failed with error: %d\n",
57               pic->error_code);
58        ret = ff_libwebp_error_to_averror(pic->error_code);
59        goto end;
60    }
61
62    ret = ff_get_encode_buffer(avctx, pkt, mw.size, 0);
63    if (ret < 0)
64        goto end;
65    memcpy(pkt->data, mw.mem, mw.size);
66
67    *got_packet = 1;
68
69end:
70#if (WEBP_ENCODER_ABI_VERSION > 0x0203)
71    WebPMemoryWriterClear(&mw);
72#else
73    free(mw.mem); /* must use free() according to libwebp documentation */
74#endif
75    WebPPictureFree(pic);
76    av_freep(&pic);
77    av_frame_free(&alt_frame);
78
79    return ret;
80}
81
82static int libwebp_encode_close(AVCodecContext *avctx)
83{
84    LibWebPContextCommon *s  = avctx->priv_data;
85    av_frame_free(&s->ref);
86
87    return 0;
88}
89
90const FFCodec ff_libwebp_encoder = {
91    .p.name         = "libwebp",
92    .p.long_name    = NULL_IF_CONFIG_SMALL("libwebp WebP image"),
93    .p.type         = AVMEDIA_TYPE_VIDEO,
94    .p.id           = AV_CODEC_ID_WEBP,
95    .p.capabilities = AV_CODEC_CAP_DR1,
96    .p.pix_fmts     = ff_libwebpenc_pix_fmts,
97    .p.priv_class   = &ff_libwebpenc_class,
98    .p.wrapper_name = "libwebp",
99    .priv_data_size = sizeof(LibWebPContext),
100    .defaults       = ff_libwebp_defaults,
101    .init           = libwebp_encode_init,
102    FF_CODEC_ENCODE_CB(libwebp_encode_frame),
103    .close          = libwebp_encode_close,
104};
105