blob: 4057ed34239125c1f595d2f1b1416fa71512e301 [file] [log] [blame]
/*
* Copyright (c) 2010, Google, Inc.
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*
* @file
* WebP muxer
* http://code.google.com/p/webp
*
* supports metadata: artist, copyright, title, comment
* Encoding/decoding examples:
* ffmpeg -i my_image
* -metadata artist=me -metadata title="sunset"
* -metadata copyright=2010 -metadata comment="nice pic!"
* -profile 1 -qmin 5 my_image.webp
* ffmpeg -i my_image.webp -y my_image.png
*/
#include "webp.h"
typedef struct {
uint64_t riff_start;
} WEBPContext;
static int write_header(AVFormatContext *s)
{
ByteIOContext *pb = s->pb;
WEBPContext *webp = s->priv_data;
AVStream *stream;
AVCodecContext *codec;
if (s->nb_streams != 1) {
av_log(s, AV_LOG_ERROR, "muxer only support 1 video stream.");
return AVERROR(EINVAL);
}
stream = s->streams[0];
codec = stream->codec;
if (codec->codec_type != AVMEDIA_TYPE_VIDEO)
return AVERROR(EINVAL);
if (codec->codec_id != CODEC_ID_VP8)
return AVERROR(EINVAL);
webp->riff_start = ff_start_tag(pb, "RIFF");
put_tag(pb, "WEBP");
return 0;
}
static int write_packet(AVFormatContext *s, AVPacket *pkt)
{
AVStream *stream = s->streams[pkt->stream_index];
AVCodecContext *codec = stream->codec;
ByteIOContext *pb = s->pb;
uint64_t vp8_start;
if (codec->codec_id != CODEC_ID_VP8) {
av_log(s, AV_LOG_ERROR, "muxer only supports VP8 codec.");
return AVERROR(EINVAL);
}
vp8_start = ff_start_tag(pb, "VP8 ");
put_buffer(pb, pkt->data, pkt->size);
if (pkt->size & 1) put_byte(pb, 0); // pad
ff_end_tag(pb, vp8_start);
put_flush_packet(pb);
return 0;
}
static void put_metadata(AVFormatContext *s,
const AVMetadataConv* metadata)
{
ByteIOContext *pb = s->pb;
AVMetadataTag *t;
uint64_t pos;
int len;
t = av_metadata_get(s->metadata, metadata->generic, NULL, 0);
if (!t) return;
pos = ff_start_tag(pb, metadata->native);
len = strlen(t->value) + 1;
put_buffer(pb, t->value, len);
if (len & 1) put_byte(pb, 0); // pad
ff_end_tag(pb, pos);
}
static int write_trailer(AVFormatContext *s)
{
ByteIOContext *pb = s->pb;
WEBPContext *webp = s->priv_data;
int i;
for (i = 0; ff_webp_metadata_conv[i].native; ++i) {
put_metadata(s, &ff_webp_metadata_conv[i]);
}
ff_end_tag(pb, webp->riff_start);
put_flush_packet(pb);
return 0;
}
AVOutputFormat webp_muxer = {
.name = "webp",
.long_name = NULL_IF_CONFIG_SMALL("WebP"),
.mime_type = "image/webp",
.extensions = "webp",
.priv_data_size = sizeof(WEBPContext),
.audio_codec = CODEC_ID_NONE,
.video_codec = CODEC_ID_VP8,
.write_header = write_header,
.write_packet = write_packet,
.write_trailer = write_trailer,
};