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
31 typedef LibWebPContextCommon LibWebPContext;
32
libwebp_encode_init(AVCodecContext * avctx)33 static av_cold int libwebp_encode_init(AVCodecContext *avctx)
34 {
35 return ff_libwebp_encode_init_common(avctx);
36 }
37
libwebp_encode_frame(AVCodecContext * avctx,AVPacket * pkt,const AVFrame * frame,int * got_packet)38 static 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
69 end:
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
libwebp_encode_close(AVCodecContext * avctx)82 static 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
90 const 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