1 /*
2 * WebP encoding support via libwebp
3 * Copyright (c) 2015 Urvang Joshi
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 (WebPAnimEncoder API)
25 */
26
27 #include "config.h"
28 #include "libwebpenc_common.h"
29
30 #include <webp/mux.h>
31
32 typedef struct LibWebPAnimContext {
33 LibWebPContextCommon cc;
34 WebPAnimEncoder *enc; // the main AnimEncoder object
35 int64_t prev_frame_pts; // pts of the previously encoded frame.
36 int done; // If true, we have assembled the bitstream already
37 } LibWebPAnimContext;
38
libwebp_anim_encode_init(AVCodecContext * avctx)39 static av_cold int libwebp_anim_encode_init(AVCodecContext *avctx)
40 {
41 int ret = ff_libwebp_encode_init_common(avctx);
42 if (!ret) {
43 LibWebPAnimContext *s = avctx->priv_data;
44 WebPAnimEncoderOptions enc_options = { { 0 } };
45 WebPAnimEncoderOptionsInit(&enc_options);
46 enc_options.verbose = av_log_get_level() >= AV_LOG_VERBOSE;
47 // TODO(urvang): Expose some options on command-line perhaps.
48 s->enc = WebPAnimEncoderNew(avctx->width, avctx->height, &enc_options);
49 if (!s->enc)
50 return AVERROR(EINVAL);
51 s->prev_frame_pts = -1;
52 s->done = 0;
53 }
54 return ret;
55 }
56
libwebp_anim_encode_frame(AVCodecContext * avctx,AVPacket * pkt,const AVFrame * frame,int * got_packet)57 static int libwebp_anim_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
58 const AVFrame *frame, int *got_packet) {
59 LibWebPAnimContext *s = avctx->priv_data;
60 int ret;
61
62 if (!frame) {
63 if (s->done) { // Second flush: return empty package to denote finish.
64 *got_packet = 0;
65 return 0;
66 } else { // First flush: assemble bitstream and return it.
67 WebPData assembled_data = { 0 };
68 ret = WebPAnimEncoderAssemble(s->enc, &assembled_data);
69 if (ret) {
70 ret = ff_alloc_packet2(avctx, pkt, assembled_data.size, assembled_data.size);
71 if (ret < 0)
72 return ret;
73 memcpy(pkt->data, assembled_data.bytes, assembled_data.size);
74 s->done = 1;
75 pkt->flags |= AV_PKT_FLAG_KEY;
76 pkt->pts = pkt->dts = s->prev_frame_pts + 1;
77 *got_packet = 1;
78 return 0;
79 } else {
80 av_log(s, AV_LOG_ERROR,
81 "WebPAnimEncoderAssemble() failed with error: %d\n",
82 VP8_ENC_ERROR_OUT_OF_MEMORY);
83 return AVERROR(ENOMEM);
84 }
85 }
86 } else {
87 int timestamp_ms;
88 WebPPicture *pic = NULL;
89 AVFrame *alt_frame = NULL;
90 ret = ff_libwebp_get_frame(avctx, &s->cc, frame, &alt_frame, &pic);
91 if (ret < 0)
92 goto end;
93
94 timestamp_ms =
95 avctx->time_base.num * frame->pts * 1000 / avctx->time_base.den;
96 ret = WebPAnimEncoderAdd(s->enc, pic, timestamp_ms, &s->cc.config);
97 if (!ret) {
98 av_log(avctx, AV_LOG_ERROR,
99 "Encoding WebP frame failed with error: %d\n",
100 pic->error_code);
101 ret = ff_libwebp_error_to_averror(pic->error_code);
102 goto end;
103 }
104
105 pkt->pts = pkt->dts = frame->pts;
106 s->prev_frame_pts = frame->pts; // Save for next frame.
107 ret = 0;
108 *got_packet = 1;
109
110 end:
111 WebPPictureFree(pic);
112 av_freep(&pic);
113 av_frame_free(&alt_frame);
114 return ret;
115 }
116 }
117
libwebp_anim_encode_close(AVCodecContext * avctx)118 static int libwebp_anim_encode_close(AVCodecContext *avctx)
119 {
120 LibWebPAnimContext *s = avctx->priv_data;
121 av_frame_free(&s->cc.ref);
122 WebPAnimEncoderDelete(s->enc);
123
124 return 0;
125 }
126
127 static const AVClass class = {
128 .class_name = "libwebp_anim",
129 .item_name = av_default_item_name,
130 .option = options,
131 .version = LIBAVUTIL_VERSION_INT,
132 };
133
134 AVCodec ff_libwebp_anim_encoder = {
135 .name = "libwebp_anim",
136 .long_name = NULL_IF_CONFIG_SMALL("libwebp WebP image"),
137 .type = AVMEDIA_TYPE_VIDEO,
138 .id = AV_CODEC_ID_WEBP,
139 .priv_data_size = sizeof(LibWebPAnimContext),
140 .init = libwebp_anim_encode_init,
141 .encode2 = libwebp_anim_encode_frame,
142 .close = libwebp_anim_encode_close,
143 .capabilities = AV_CODEC_CAP_DELAY,
144 .pix_fmts = (const enum AVPixelFormat[]) {
145 AV_PIX_FMT_RGB32,
146 AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVA420P,
147 AV_PIX_FMT_NONE
148 },
149 .priv_class = &class,
150 .defaults = libwebp_defaults,
151 .wrapper_name = "libwebp",
152 };
153