Commit | Line | Data |
---|---|---|
f6fa7814 DM |
1 | /* |
2 | * webp muxer | |
3 | * Copyright (c) 2014 Michael Niedermayer | |
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 | #include "libavutil/intreadwrite.h" | |
23 | #include "libavutil/opt.h" | |
24 | #include "avformat.h" | |
25 | #include "internal.h" | |
26 | ||
27 | typedef struct WebpContext{ | |
28 | AVClass *class; | |
29 | int frame_count; | |
30 | AVPacket last_pkt; | |
31 | int loop; | |
32 | } WebpContext; | |
33 | ||
34 | static int webp_write_header(AVFormatContext *s) | |
35 | { | |
36 | AVStream *st; | |
37 | ||
38 | if (s->nb_streams != 1) { | |
39 | av_log(s, AV_LOG_ERROR, "Only exactly 1 stream is supported\n"); | |
40 | return AVERROR(EINVAL); | |
41 | } | |
42 | st = s->streams[0]; | |
43 | if (st->codec->codec_id != AV_CODEC_ID_WEBP) { | |
44 | av_log(s, AV_LOG_ERROR, "Only WebP is supported\n"); | |
45 | return AVERROR(EINVAL); | |
46 | } | |
47 | avpriv_set_pts_info(st, 24, 1, 1000); | |
48 | ||
49 | avio_write(s->pb, "RIFF\0\0\0\0WEBP", 12); | |
50 | ||
51 | return 0; | |
52 | } | |
53 | ||
54 | static int flush(AVFormatContext *s, int trailer, int64_t pts) | |
55 | { | |
56 | WebpContext *w = s->priv_data; | |
57 | AVStream *st = s->streams[0]; | |
58 | ||
59 | if (w->last_pkt.size) { | |
60 | int skip = 0; | |
61 | unsigned flags = 0; | |
62 | int vp8x = 0; | |
63 | ||
64 | if (AV_RL32(w->last_pkt.data) == AV_RL32("RIFF")) | |
65 | skip = 12; | |
66 | if (AV_RL32(w->last_pkt.data + skip) == AV_RL32("VP8X")) { | |
67 | flags |= w->last_pkt.data[skip + 4 + 4]; | |
68 | vp8x = 1; | |
69 | skip += AV_RL32(w->last_pkt.data + skip + 4) + 8; | |
70 | } | |
71 | ||
72 | w->frame_count ++; | |
73 | ||
74 | if (w->frame_count == 1) { | |
75 | if (!trailer) { | |
76 | vp8x = 1; | |
77 | flags |= 2 + 16; | |
78 | } | |
79 | ||
80 | if (vp8x) { | |
81 | avio_write(s->pb, "VP8X", 4); | |
82 | avio_wl32(s->pb, 10); | |
83 | avio_w8(s->pb, flags); | |
84 | avio_wl24(s->pb, 0); | |
85 | avio_wl24(s->pb, st->codec->width - 1); | |
86 | avio_wl24(s->pb, st->codec->height - 1); | |
87 | } | |
88 | if (!trailer) { | |
89 | avio_write(s->pb, "ANIM", 4); | |
90 | avio_wl32(s->pb, 6); | |
91 | avio_wl32(s->pb, 0xFFFFFFFF); | |
92 | avio_wl16(s->pb, w->loop); | |
93 | } | |
94 | } | |
95 | ||
96 | if (w->frame_count > trailer) { | |
97 | avio_write(s->pb, "ANMF", 4); | |
98 | avio_wl32(s->pb, 16 + w->last_pkt.size - skip); | |
99 | avio_wl24(s->pb, 0); | |
100 | avio_wl24(s->pb, 0); | |
101 | avio_wl24(s->pb, st->codec->width - 1); | |
102 | avio_wl24(s->pb, st->codec->height - 1); | |
103 | if (w->last_pkt.pts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE) { | |
104 | avio_wl24(s->pb, pts - w->last_pkt.pts); | |
105 | } else | |
106 | avio_wl24(s->pb, w->last_pkt.duration); | |
107 | avio_w8(s->pb, 0); | |
108 | } | |
109 | avio_write(s->pb, w->last_pkt.data + skip, w->last_pkt.size - skip); | |
110 | av_free_packet(&w->last_pkt); | |
111 | } | |
112 | ||
113 | return 0; | |
114 | } | |
115 | ||
116 | static int webp_write_packet(AVFormatContext *s, AVPacket *pkt) | |
117 | { | |
118 | WebpContext *w = s->priv_data; | |
119 | int ret; | |
120 | ||
121 | if ((ret = flush(s, 0, pkt->pts)) < 0) | |
122 | return ret; | |
123 | ||
124 | av_copy_packet(&w->last_pkt, pkt); | |
125 | ||
126 | return 0; | |
127 | } | |
128 | ||
129 | static int webp_write_trailer(AVFormatContext *s) | |
130 | { | |
131 | unsigned filesize; | |
132 | int ret; | |
133 | ||
134 | if ((ret = flush(s, 1, AV_NOPTS_VALUE)) < 0) | |
135 | return ret; | |
136 | ||
137 | filesize = avio_tell(s->pb); | |
138 | avio_seek(s->pb, 4, SEEK_SET); | |
139 | avio_wl32(s->pb, filesize - 8); | |
140 | ||
141 | return 0; | |
142 | } | |
143 | ||
144 | #define OFFSET(x) offsetof(WebpContext, x) | |
145 | #define ENC AV_OPT_FLAG_ENCODING_PARAM | |
146 | static const AVOption options[] = { | |
147 | { "loop", "Number of times to loop the output: 0 - infinite loop", OFFSET(loop), | |
148 | AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 65535, ENC }, | |
149 | { NULL }, | |
150 | }; | |
151 | ||
152 | static const AVClass webp_muxer_class = { | |
153 | .class_name = "WebP muxer", | |
154 | .item_name = av_default_item_name, | |
155 | .version = LIBAVUTIL_VERSION_INT, | |
156 | .option = options, | |
157 | }; | |
158 | AVOutputFormat ff_webp_muxer = { | |
159 | .name = "webp", | |
160 | .long_name = NULL_IF_CONFIG_SMALL("WebP"), | |
161 | .extensions = "webp", | |
162 | .priv_data_size = sizeof(WebpContext), | |
163 | .video_codec = AV_CODEC_ID_WEBP, | |
164 | .write_header = webp_write_header, | |
165 | .write_packet = webp_write_packet, | |
166 | .write_trailer = webp_write_trailer, | |
167 | .priv_class = &webp_muxer_class, | |
168 | .flags = AVFMT_VARIABLE_FPS, | |
169 | }; |