1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
|
/*
* 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_packet(pkt, 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 = 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,
};
|
