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 "codec_internal.h"
29 #include "encode.h"
30 #include "libwebpenc_common.h"
31
32 #include <webp/mux.h>
33
34 typedef struct LibWebPAnimContext {
35 LibWebPContextCommon cc;
36 WebPAnimEncoder *enc; // the main AnimEncoder object
37 int64_t first_frame_pts; // pts of the first encoded frame.
38 int done; // If true, we have assembled the bitstream already
39 } LibWebPAnimContext;
40
libwebp_anim_encode_init(AVCodecContext *avctx)41 static av_cold int libwebp_anim_encode_init(AVCodecContext *avctx)
42 {
43 int ret = ff_libwebp_encode_init_common(avctx);
44 if (!ret) {
45 LibWebPAnimContext *s = avctx->priv_data;
46 WebPAnimEncoderOptions enc_options = { { 0 } };
47 WebPAnimEncoderOptionsInit(&enc_options);
48 enc_options.verbose = av_log_get_level() >= AV_LOG_VERBOSE;
49 // TODO(urvang): Expose some options on command-line perhaps.
50 s->enc = WebPAnimEncoderNew(avctx->width, avctx->height, &enc_options);
51 if (!s->enc)
52 return AVERROR(EINVAL);
53 s->first_frame_pts = AV_NOPTS_VALUE;
54 s->done = 0;
55 }
56 return ret;
57 }
58
libwebp_anim_encode_frame(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *frame, int *got_packet)59 static int libwebp_anim_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
60 const AVFrame *frame, int *got_packet) {
61 LibWebPAnimContext *s = avctx->priv_data;
62 int ret;
63
64 if (!frame) {
65 if (s->done) { // Second flush: return empty package to denote finish.
66 *got_packet = 0;
67 return 0;
68 } else { // First flush: assemble bitstream and return it.
69 WebPData assembled_data = { 0 };
70 ret = WebPAnimEncoderAssemble(s->enc, &assembled_data);
71 if (ret) {
72 ret = ff_get_encode_buffer(avctx, pkt, assembled_data.size, 0);
73 if (ret < 0) {
74 WebPDataClear(&assembled_data);
75 return ret;
76 }
77 memcpy(pkt->data, assembled_data.bytes, assembled_data.size);
78 WebPDataClear(&assembled_data);
79 s->done = 1;
80 pkt->pts = pkt->dts = s->first_frame_pts;
81 *got_packet = 1;
82 return 0;
83 } else {
84 WebPDataClear(&assembled_data);
85 av_log(s, AV_LOG_ERROR,
86 "WebPAnimEncoderAssemble() failed with error: %d\n",
87 VP8_ENC_ERROR_OUT_OF_MEMORY);
88 return AVERROR(ENOMEM);
89 }
90 }
91 } else {
92 int timestamp_ms;
93 WebPPicture *pic = NULL;
94 AVFrame *alt_frame = NULL;
95 ret = ff_libwebp_get_frame(avctx, &s->cc, frame, &alt_frame, &pic);
96 if (ret < 0)
97 goto end;
98
99 timestamp_ms =
100 avctx->time_base.num * frame->pts * 1000 / avctx->time_base.den;
101 ret = WebPAnimEncoderAdd(s->enc, pic, timestamp_ms, &s->cc.config);
102 if (!ret) {
103 av_log(avctx, AV_LOG_ERROR,
104 "Encoding WebP frame failed with error: %d\n",
105 pic->error_code);
106 ret = ff_libwebp_error_to_averror(pic->error_code);
107 goto end;
108 }
109
110 if (!avctx->frame_number)
111 s->first_frame_pts = frame->pts;
112 ret = 0;
113 *got_packet = 0;
114
115 end:
116 WebPPictureFree(pic);
117 av_freep(&pic);
118 av_frame_free(&alt_frame);
119 return ret;
120 }
121 }
122
libwebp_anim_encode_close(AVCodecContext *avctx)123 static int libwebp_anim_encode_close(AVCodecContext *avctx)
124 {
125 LibWebPAnimContext *s = avctx->priv_data;
126 av_frame_free(&s->cc.ref);
127 WebPAnimEncoderDelete(s->enc);
128
129 return 0;
130 }
131
132 const FFCodec ff_libwebp_anim_encoder = {
133 .p.name = "libwebp_anim",
134 .p.long_name = NULL_IF_CONFIG_SMALL("libwebp WebP image"),
135 .p.type = AVMEDIA_TYPE_VIDEO,
136 .p.id = AV_CODEC_ID_WEBP,
137 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY,
138 .p.pix_fmts = ff_libwebpenc_pix_fmts,
139 .p.priv_class = &ff_libwebpenc_class,
140 .p.wrapper_name = "libwebp",
141 .priv_data_size = sizeof(LibWebPAnimContext),
142 .defaults = ff_libwebp_defaults,
143 .init = libwebp_anim_encode_init,
144 FF_CODEC_ENCODE_CB(libwebp_anim_encode_frame),
145 .close = libwebp_anim_encode_close,
146 };
147