path: root/libavcodec/libwebpenc_animencoder.c (plain)
blob: 91bf64ca8b8b01250978b79621a98fddaf335e29

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
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
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
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	};
152