mpjpeg.c 2.63 KB
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/*
 * Multipart JPEG format
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 * Copyright (c) 2000, 2001, 2002, 2003 Fabrice Bellard
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 *
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 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * 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
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include "libavutil/opt.h"
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#include "avformat.h"

/* Multipart JPEG */

#define BOUNDARY_TAG "ffserver"

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typedef struct MPJPEGContext {
    AVClass *class;
    char *boundary_tag;
} MPJPEGContext;

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static int mpjpeg_write_header(AVFormatContext *s)
{
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    MPJPEGContext *mpj = s->priv_data;
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    avio_printf(s->pb, "--%s\r\n", mpj->boundary_tag);
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    avio_flush(s->pb);
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    return 0;
}

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static int mpjpeg_write_packet(AVFormatContext *s, AVPacket *pkt)
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{
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    MPJPEGContext *mpj = s->priv_data;
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    avio_printf(s->pb, "Content-type: image/jpeg\r\n");
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    avio_printf(s->pb, "Content-length: %d\r\n\r\n",
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                pkt->size);
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    avio_write(s->pb, pkt->data, pkt->size);
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    avio_printf(s->pb, "\r\n--%s\r\n", mpj->boundary_tag);
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    return 0;
}

static int mpjpeg_write_trailer(AVFormatContext *s)
{
    return 0;
}

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static const AVOption options[] = {
    { "boundary_tag",    "Boundary tag", offsetof(MPJPEGContext, boundary_tag),   AV_OPT_TYPE_STRING, {.str = BOUNDARY_TAG}, .flags = AV_OPT_FLAG_ENCODING_PARAM },
    { NULL },
};

static const AVClass mpjpeg_muxer_class = {
    .class_name = "mpjpeg_muxer",
    .item_name  = av_default_item_name,
    .option     = options,
    .version    = LIBAVUTIL_VERSION_INT,
};

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AVOutputFormat ff_mpjpeg_muxer = {
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    .name              = "mpjpeg",
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    .long_name         = NULL_IF_CONFIG_SMALL("MIME multipart JPEG"),
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    .mime_type         = "multipart/x-mixed-replace;boundary=" BOUNDARY_TAG,
    .extensions        = "mjpg",
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    .priv_data_size    = sizeof(MPJPEGContext),
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    .audio_codec       = AV_CODEC_ID_NONE,
    .video_codec       = AV_CODEC_ID_MJPEG,
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    .write_header      = mpjpeg_write_header,
    .write_packet      = mpjpeg_write_packet,
    .write_trailer     = mpjpeg_write_trailer,
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    .flags             = AVFMT_NOTIMESTAMPS,
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    .priv_class        = &mpjpeg_muxer_class,
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};