| 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 | }; |