[deb_ffmpeg.git] / ffmpeg / libavformat / ffmenc.c

/*
 * FFM (ffserver live feed) muxer
 * Copyright (c) 2001 Fabrice Bellard
 *
 * 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
 */

#include "libavutil/intreadwrite.h"
#include "libavutil/intfloat.h"
#include "libavutil/avassert.h"
#include "libavutil/parseutils.h"
#include "libavutil/opt.h"
#include "avformat.h"
#include "internal.h"
#include "ffm.h"

static void flush_packet(AVFormatContext *s)
{
    FFMContext *ffm = s->priv_data;
    int fill_size, h;
    AVIOContext *pb = s->pb;

    fill_size = ffm->packet_end - ffm->packet_ptr;
    memset(ffm->packet_ptr, 0, fill_size);

    av_assert1(avio_tell(pb) % ffm->packet_size == 0);

    /* put header */
    avio_wb16(pb, PACKET_ID);
    avio_wb16(pb, fill_size);
    avio_wb64(pb, ffm->dts);
    h = ffm->frame_offset;
    if (ffm->first_packet)
        h |= 0x8000;
    avio_wb16(pb, h);
    avio_write(pb, ffm->packet, ffm->packet_end - ffm->packet);
    avio_flush(pb);

    /* prepare next packet */
    ffm->frame_offset = 0; /* no key frame */
    ffm->packet_ptr = ffm->packet;
    ffm->first_packet = 0;
}

/* 'first' is true if first data of a frame */
static void ffm_write_data(AVFormatContext *s,
                           const uint8_t *buf, int size,
                           int64_t dts, int header)
{
    FFMContext *ffm = s->priv_data;
    int len;

    if (header && ffm->frame_offset == 0) {
        ffm->frame_offset = ffm->packet_ptr - ffm->packet + FFM_HEADER_SIZE;
        ffm->dts = dts;
    }

    /* write as many packets as needed */
    while (size > 0) {
        len = ffm->packet_end - ffm->packet_ptr;
        if (len > size)
            len = size;
        memcpy(ffm->packet_ptr, buf, len);

        ffm->packet_ptr += len;
        buf += len;
        size -= len;
        if (ffm->packet_ptr >= ffm->packet_end)
            flush_packet(s);
    }
}

static void write_header_chunk(AVIOContext *pb, AVIOContext *dpb, unsigned id)
{
    uint8_t *dyn_buf;
    int dyn_size= avio_close_dyn_buf(dpb, &dyn_buf);
    avio_wb32(pb, id);
    avio_wb32(pb, dyn_size);
    avio_write(pb, dyn_buf, dyn_size);
    av_free(dyn_buf);
}

static int ffm_write_header_codec_private_ctx(AVIOContext *pb, AVCodecContext *ctx, int type)
{
    AVIOContext *tmp;
    char *buf = NULL;
    int ret;
    const AVCodec *enc = ctx->codec ? ctx->codec : avcodec_find_encoder(ctx->codec_id);

    if (!enc)
        return AVERROR(EINVAL);
    if (ctx->priv_data && enc->priv_class && enc->priv_data_size) {
        if ((ret = av_opt_serialize(ctx->priv_data, AV_OPT_FLAG_ENCODING_PARAM | type,
                                    AV_OPT_SERIALIZE_SKIP_DEFAULTS, &buf, '=', ',')) < 0)
            return ret;
        if (buf && strlen(buf)) {
            if (avio_open_dyn_buf(&tmp) < 0) {
                av_free(buf);
                return AVERROR(ENOMEM);
            }
            avio_put_str(tmp, buf);
            write_header_chunk(pb, tmp, MKBETAG('C', 'P', 'R', 'V'));
        }
        av_free(buf);
    }
    return 0;
}

static int ffm_write_header_codec_ctx(AVIOContext *pb, AVCodecContext *ctx, unsigned tag, int type)
{
    AVIOContext *tmp;
    char *buf = NULL;
    uint8_t *p = NULL;
    int ret, need_coma = 0;

#define SKIP_DEFAULTS   AV_OPT_SERIALIZE_SKIP_DEFAULTS
#define OPT_FLAGS_EXACT AV_OPT_SERIALIZE_OPT_FLAGS_EXACT
#define ENC             AV_OPT_FLAG_ENCODING_PARAM

    if (avio_open_dyn_buf(&tmp) < 0)
        return AVERROR(ENOMEM);
    if ((ret = av_opt_serialize(ctx, ENC | type, SKIP_DEFAULTS, &buf, '=', ',')) < 0)
        goto fail;
    if (buf && strlen(buf)) {
        avio_write(tmp, buf, strlen(buf));
        av_free(buf);
        need_coma = 1;
    }
    if ((ret = av_opt_serialize(ctx, 0, SKIP_DEFAULTS | OPT_FLAGS_EXACT, &buf, '=', ',')) < 0)
        goto fail;
    if (buf && strlen(buf)) {
        if (need_coma)
            avio_w8(tmp, ',');
        avio_write(tmp, buf, strlen(buf));
        av_free(buf);
    }
    avio_w8(tmp, 0);
    write_header_chunk(pb, tmp, tag);
    return 0;
  fail:
    av_free(buf);
    avio_close_dyn_buf(tmp, &p);
    av_free(p);
    return ret;

#undef SKIP_DEFAULTS
#undef OPT_FLAGS_EXACT
#undef ENC
}

static int ffm_write_recommended_config(AVIOContext *pb, AVCodecContext *ctx, unsigned tag,
                                        const char *configuration)
{
    int ret;
    const AVCodec *enc = ctx->codec ? ctx->codec : avcodec_find_encoder(ctx->codec_id);
    AVIOContext *tmp;
    AVDictionaryEntry *t = NULL;
    AVDictionary *all = NULL, *comm = NULL, *prv = NULL;
    char *buf = NULL;

    if (!enc || !enc->priv_class || !enc->priv_data_size) {
        /* codec is not known/has no private options, so save everything as common options */
        if (avio_open_dyn_buf(&tmp) < 0)
            return AVERROR(ENOMEM);
        avio_put_str(tmp, configuration);
        write_header_chunk(pb, tmp, tag);
        return 0;
    }

    if ((ret = av_dict_parse_string(&all, configuration, "=", ",", 0)) < 0)
        return ret;

    while ((t = av_dict_get(all, "", t, AV_DICT_IGNORE_SUFFIX))) {
        if (av_opt_find((void *)&enc->priv_class, t->key, NULL, 0, AV_OPT_SEARCH_FAKE_OBJ)) {
            if ((ret = av_dict_set(&prv, t->key, t->value, 0)) < 0)
                goto fail;
        } else if ((ret = av_dict_set(&comm, t->key, t->value, 0)) < 0)
            goto fail;
    }

    if (comm) {
        if ((ret = av_dict_get_string(comm, &buf, '=', ',')) < 0 ||
            (ret = avio_open_dyn_buf(&tmp)) < 0)
            goto fail;
        avio_put_str(tmp, buf);
        av_freep(&buf);
        write_header_chunk(pb, tmp, tag);
    }
    if (prv) {
        if ((ret = av_dict_get_string(prv, &buf, '=', ',')) < 0 ||
            (ret = avio_open_dyn_buf(&tmp)) < 0)
            goto fail;
        avio_put_str(tmp, buf);
        write_header_chunk(pb, tmp, MKBETAG('C', 'P', 'R', 'V'));
    }

  fail:
    av_free(buf);
    av_dict_free(&all);
    av_dict_free(&comm);
    av_dict_free(&prv);
    return ret;
}

static int ffm_write_header(AVFormatContext *s)
{
    FFMContext *ffm = s->priv_data;
    AVDictionaryEntry *t;
    AVStream *st;
    AVIOContext *pb = s->pb;
    AVCodecContext *codec;
    int bit_rate, i, ret;

    if (t = av_dict_get(s->metadata, "creation_time", NULL, 0)) {
        ret = av_parse_time(&ffm->start_time, t->value, 0);
        if (ret < 0)
            return ret;
    }

    ffm->packet_size = FFM_PACKET_SIZE;

    /* header */
    avio_wl32(pb, MKTAG('F', 'F', 'M', '2'));
    avio_wb32(pb, ffm->packet_size);
    avio_wb64(pb, 0); /* current write position */

    if(avio_open_dyn_buf(&pb) < 0)
        return AVERROR(ENOMEM);

    avio_wb32(pb, s->nb_streams);
    bit_rate = 0;
    for(i=0;i<s->nb_streams;i++) {
        st = s->streams[i];
        bit_rate += st->codec->bit_rate;
    }
    avio_wb32(pb, bit_rate);

    write_header_chunk(s->pb, pb, MKBETAG('M', 'A', 'I', 'N'));

    /* list of streams */
    for(i=0;i<s->nb_streams;i++) {
        st = s->streams[i];
        avpriv_set_pts_info(st, 64, 1, 1000000);
        if(avio_open_dyn_buf(&pb) < 0)
            return AVERROR(ENOMEM);

        codec = st->codec;
        /* generic info */
        avio_wb32(pb, codec->codec_id);
        avio_w8(pb, codec->codec_type);
        avio_wb32(pb, codec->bit_rate);
        avio_wb32(pb, codec->flags);
        avio_wb32(pb, codec->flags2);
        avio_wb32(pb, codec->debug);
        if (codec->flags & CODEC_FLAG_GLOBAL_HEADER) {
            avio_wb32(pb, codec->extradata_size);
            avio_write(pb, codec->extradata, codec->extradata_size);
        }
        write_header_chunk(s->pb, pb, MKBETAG('C', 'O', 'M', 'M'));
        /* specific info */
        switch(codec->codec_type) {
        case AVMEDIA_TYPE_VIDEO:
            if (st->recommended_encoder_configuration) {
                av_log(NULL, AV_LOG_DEBUG, "writing recommended configuration: %s\n",
                       st->recommended_encoder_configuration);
                if ((ret = ffm_write_recommended_config(s->pb, codec, MKBETAG('S', '2', 'V', 'I'),
                                                        st->recommended_encoder_configuration)) < 0)
                return ret;
            } else if ((ret = ffm_write_header_codec_ctx(s->pb, codec, MKBETAG('S', '2', 'V', 'I'), AV_OPT_FLAG_VIDEO_PARAM)) < 0 ||
                       (ret = ffm_write_header_codec_private_ctx(s->pb, codec, AV_OPT_FLAG_VIDEO_PARAM)) < 0)
                return ret;
            break;
        case AVMEDIA_TYPE_AUDIO:
            if (st->recommended_encoder_configuration) {
                av_log(NULL, AV_LOG_DEBUG, "writing recommended configuration: %s\n",
                       st->recommended_encoder_configuration);
                if ((ret = ffm_write_recommended_config(s->pb, codec, MKBETAG('S', '2', 'A', 'U'),
                                                        st->recommended_encoder_configuration)) < 0)
                return ret;
            } else if ((ret = ffm_write_header_codec_ctx(s->pb, codec, MKBETAG('S', '2', 'A', 'U'), AV_OPT_FLAG_AUDIO_PARAM)) < 0 ||
                     (ret = ffm_write_header_codec_private_ctx(s->pb, codec, AV_OPT_FLAG_AUDIO_PARAM)) < 0)
                return ret;
            break;
        default:
            return -1;
        }
    }
    pb = s->pb;

    avio_wb64(pb, 0); // end of header

    /* flush until end of block reached */
    while ((avio_tell(pb) % ffm->packet_size) != 0)
        avio_w8(pb, 0);

    avio_flush(pb);

    /* init packet mux */
    ffm->packet_ptr = ffm->packet;
    ffm->packet_end = ffm->packet + ffm->packet_size - FFM_HEADER_SIZE;
    av_assert0(ffm->packet_end >= ffm->packet);
    ffm->frame_offset = 0;
    ffm->dts = 0;
    ffm->first_packet = 1;

    return 0;
}

static int ffm_write_packet(AVFormatContext *s, AVPacket *pkt)
{
    FFMContext *ffm = s->priv_data;
    int64_t dts;
    uint8_t header[FRAME_HEADER_SIZE+4];
    int header_size = FRAME_HEADER_SIZE;

    dts = ffm->start_time + pkt->dts;
    /* packet size & key_frame */
    header[0] = pkt->stream_index;
    header[1] = 0;
    if (pkt->flags & AV_PKT_FLAG_KEY)
        header[1] |= FLAG_KEY_FRAME;
    AV_WB24(header+2, pkt->size);
    AV_WB24(header+5, pkt->duration);
    AV_WB64(header+8, ffm->start_time + pkt->pts);
    if (pkt->pts != pkt->dts) {
        header[1] |= FLAG_DTS;
        AV_WB32(header+16, pkt->pts - pkt->dts);
        header_size += 4;
    }
    ffm_write_data(s, header, header_size, dts, 1);
    ffm_write_data(s, pkt->data, pkt->size, dts, 0);

    return 0;
}

static int ffm_write_trailer(AVFormatContext *s)
{
    FFMContext *ffm = s->priv_data;

    /* flush packets */
    if (ffm->packet_ptr > ffm->packet)
        flush_packet(s);

    return 0;
}

AVOutputFormat ff_ffm_muxer = {
    .name              = "ffm",
    .long_name         = NULL_IF_CONFIG_SMALL("FFM (FFserver live feed)"),
    .extensions        = "ffm",
    .priv_data_size    = sizeof(FFMContext),
    .audio_codec       = AV_CODEC_ID_MP2,
    .video_codec       = AV_CODEC_ID_MPEG1VIDEO,
    .write_header      = ffm_write_header,
    .write_packet      = ffm_write_packet,
    .write_trailer     = ffm_write_trailer,
    .flags             = AVFMT_TS_NEGATIVE,
};
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* FFM (ffserver live feed) muxer
	3	* Copyright (c) 2001 Fabrice Bellard
	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/intfloat.h"
	24	#include "libavutil/avassert.h"
	25	#include "libavutil/parseutils.h"
f6fa7814	26	#include "libavutil/opt.h"
2ba45a60 DM	27	#include "avformat.h"
	28	#include "internal.h"
	29	#include "ffm.h"
	30
	31	static void flush_packet(AVFormatContext *s)
	32	{
	33	FFMContext *ffm = s->priv_data;
	34	int fill_size, h;
	35	AVIOContext *pb = s->pb;
	36
	37	fill_size = ffm->packet_end - ffm->packet_ptr;
	38	memset(ffm->packet_ptr, 0, fill_size);
	39
	40	av_assert1(avio_tell(pb) % ffm->packet_size == 0);
	41
	42	/* put header */
	43	avio_wb16(pb, PACKET_ID);
	44	avio_wb16(pb, fill_size);
	45	avio_wb64(pb, ffm->dts);
	46	h = ffm->frame_offset;
	47	if (ffm->first_packet)
	48	h \|= 0x8000;
	49	avio_wb16(pb, h);
	50	avio_write(pb, ffm->packet, ffm->packet_end - ffm->packet);
	51	avio_flush(pb);
	52
	53	/* prepare next packet */
	54	ffm->frame_offset = 0; /* no key frame */
	55	ffm->packet_ptr = ffm->packet;
	56	ffm->first_packet = 0;
	57	}
	58
	59	/* 'first' is true if first data of a frame */
	60	static void ffm_write_data(AVFormatContext *s,
	61	const uint8_t *buf, int size,
	62	int64_t dts, int header)
	63	{
	64	FFMContext *ffm = s->priv_data;
	65	int len;
	66
	67	if (header && ffm->frame_offset == 0) {
	68	ffm->frame_offset = ffm->packet_ptr - ffm->packet + FFM_HEADER_SIZE;
	69	ffm->dts = dts;
	70	}
	71
	72	/* write as many packets as needed */
	73	while (size > 0) {
	74	len = ffm->packet_end - ffm->packet_ptr;
	75	if (len > size)
	76	len = size;
	77	memcpy(ffm->packet_ptr, buf, len);
	78
	79	ffm->packet_ptr += len;
	80	buf += len;
	81	size -= len;
	82	if (ffm->packet_ptr >= ffm->packet_end)
	83	flush_packet(s);
	84	}
	85	}
	86
	87	static void write_header_chunk(AVIOContext pb, AVIOContext dpb, unsigned id)
	88	{
	89	uint8_t *dyn_buf;
	90	int dyn_size= avio_close_dyn_buf(dpb, &dyn_buf);
91	avio_wb32(pb, id);
92	avio_wb32(pb, dyn_size);
93	avio_write(pb, dyn_buf, dyn_size);
94	av_free(dyn_buf);
95	}
96
f6fa7814 DM	97	static int ffm_write_header_codec_private_ctx(AVIOContext pb, AVCodecContext ctx, int type)
	98	{
	99	AVIOContext *tmp;
	100	char *buf = NULL;
	101	int ret;
	102	const AVCodec *enc = ctx->codec ? ctx->codec : avcodec_find_encoder(ctx->codec_id);
	103
	104	if (!enc)
	105	return AVERROR(EINVAL);
	106	if (ctx->priv_data && enc->priv_class && enc->priv_data_size) {
	107	if ((ret = av_opt_serialize(ctx->priv_data, AV_OPT_FLAG_ENCODING_PARAM \| type,
	108	AV_OPT_SERIALIZE_SKIP_DEFAULTS, &buf, '=', ',')) < 0)
	109	return ret;
	110	if (buf && strlen(buf)) {
	111	if (avio_open_dyn_buf(&tmp) < 0) {
	112	av_free(buf);
	113	return AVERROR(ENOMEM);
	114	}
	115	avio_put_str(tmp, buf);
	116	write_header_chunk(pb, tmp, MKBETAG('C', 'P', 'R', 'V'));
	117	}
	118	av_free(buf);
	119	}
	120	return 0;
	121	}
	122
	123	static int ffm_write_header_codec_ctx(AVIOContext pb, AVCodecContext ctx, unsigned tag, int type)
	124	{
	125	AVIOContext *tmp;
	126	char *buf = NULL;
	127	uint8_t *p = NULL;
	128	int ret, need_coma = 0;
	129
	130	#define SKIP_DEFAULTS AV_OPT_SERIALIZE_SKIP_DEFAULTS
	131	#define OPT_FLAGS_EXACT AV_OPT_SERIALIZE_OPT_FLAGS_EXACT
	132	#define ENC AV_OPT_FLAG_ENCODING_PARAM
	133
	134	if (avio_open_dyn_buf(&tmp) < 0)
	135	return AVERROR(ENOMEM);
	136	if ((ret = av_opt_serialize(ctx, ENC \| type, SKIP_DEFAULTS, &buf, '=', ',')) < 0)
	137	goto fail;
	138	if (buf && strlen(buf)) {
	139	avio_write(tmp, buf, strlen(buf));
	140	av_free(buf);
	141	need_coma = 1;
	142	}
	143	if ((ret = av_opt_serialize(ctx, 0, SKIP_DEFAULTS \| OPT_FLAGS_EXACT, &buf, '=', ',')) < 0)
	144	goto fail;
	145	if (buf && strlen(buf)) {
	146	if (need_coma)
	147	avio_w8(tmp, ',');
	148	avio_write(tmp, buf, strlen(buf));
	149	av_free(buf);
	150	}
	151	avio_w8(tmp, 0);
	152	write_header_chunk(pb, tmp, tag);
	153	return 0;
	154	fail:
	155	av_free(buf);
	156	avio_close_dyn_buf(tmp, &p);
	157	av_free(p);
	158	return ret;
	159
	160	#undef SKIP_DEFAULTS
161	#undef OPT_FLAGS_EXACT
162	#undef ENC
163	}
164
165	static int ffm_write_recommended_config(AVIOContext pb, AVCodecContext ctx, unsigned tag,
166	const char *configuration)
167	{
168	int ret;
169	const AVCodec *enc = ctx->codec ? ctx->codec : avcodec_find_encoder(ctx->codec_id);
170	AVIOContext *tmp;
171	AVDictionaryEntry *t = NULL;
172	AVDictionary all = NULL, comm = NULL, *prv = NULL;
173	char *buf = NULL;
174
175	if (!enc \|\| !enc->priv_class \|\| !enc->priv_data_size) {
176	/* codec is not known/has no private options, so save everything as common options */
177	if (avio_open_dyn_buf(&tmp) < 0)
178	return AVERROR(ENOMEM);
179	avio_put_str(tmp, configuration);
180	write_header_chunk(pb, tmp, tag);
181	return 0;
182	}
183
184	if ((ret = av_dict_parse_string(&all, configuration, "=", ",", 0)) < 0)
185	return ret;
186
187	while ((t = av_dict_get(all, "", t, AV_DICT_IGNORE_SUFFIX))) {
188	if (av_opt_find((void *)&enc->priv_class, t->key, NULL, 0, AV_OPT_SEARCH_FAKE_OBJ)) {
189	if ((ret = av_dict_set(&prv, t->key, t->value, 0)) < 0)
190	goto fail;
191	} else if ((ret = av_dict_set(&comm, t->key, t->value, 0)) < 0)
192	goto fail;
193	}
194
195	if (comm) {
196	if ((ret = av_dict_get_string(comm, &buf, '=', ',')) < 0 \|\|
197	(ret = avio_open_dyn_buf(&tmp)) < 0)
198	goto fail;
199	avio_put_str(tmp, buf);
200	av_freep(&buf);
201	write_header_chunk(pb, tmp, tag);
202	}
203	if (prv) {
204	if ((ret = av_dict_get_string(prv, &buf, '=', ',')) < 0 \|\|
205	(ret = avio_open_dyn_buf(&tmp)) < 0)
206	goto fail;
207	avio_put_str(tmp, buf);
208	write_header_chunk(pb, tmp, MKBETAG('C', 'P', 'R', 'V'));
209	}
210
211	fail:
212	av_free(buf);
213	av_dict_free(&all);
214	av_dict_free(&comm);
215	av_dict_free(&prv);
216	return ret;
217	}
218
2ba45a60 DM	219	static int ffm_write_header(AVFormatContext *s)
	220	{
	221	FFMContext *ffm = s->priv_data;
	222	AVDictionaryEntry *t;
	223	AVStream *st;
	224	AVIOContext *pb = s->pb;
	225	AVCodecContext *codec;
f6fa7814	226	int bit_rate, i, ret;
2ba45a60 DM	227
2ba45a60 DM	228	if (t = av_dict_get(s->metadata, "creation_time", NULL, 0)) {
f6fa7814	229	ret = av_parse_time(&ffm->start_time, t->value, 0);
2ba45a60 DM	230	if (ret < 0)
	231	return ret;
	232	}
	233
	234	ffm->packet_size = FFM_PACKET_SIZE;
	235
	236	/* header */
	237	avio_wl32(pb, MKTAG('F', 'F', 'M', '2'));
	238	avio_wb32(pb, ffm->packet_size);
	239	avio_wb64(pb, 0); /* current write position */
	240
	241	if(avio_open_dyn_buf(&pb) < 0)
	242	return AVERROR(ENOMEM);
	243
	244	avio_wb32(pb, s->nb_streams);
	245	bit_rate = 0;
	246	for(i=0;i<s->nb_streams;i++) {
	247	st = s->streams[i];
	248	bit_rate += st->codec->bit_rate;
	249	}
	250	avio_wb32(pb, bit_rate);
	251
	252	write_header_chunk(s->pb, pb, MKBETAG('M', 'A', 'I', 'N'));
	253
	254	/* list of streams */
	255	for(i=0;i<s->nb_streams;i++) {
	256	st = s->streams[i];
	257	avpriv_set_pts_info(st, 64, 1, 1000000);
	258	if(avio_open_dyn_buf(&pb) < 0)
	259	return AVERROR(ENOMEM);
	260
	261	codec = st->codec;
	262	/* generic info */
	263	avio_wb32(pb, codec->codec_id);
	264	avio_w8(pb, codec->codec_type);
	265	avio_wb32(pb, codec->bit_rate);
	266	avio_wb32(pb, codec->flags);
	267	avio_wb32(pb, codec->flags2);
	268	avio_wb32(pb, codec->debug);
	269	if (codec->flags & CODEC_FLAG_GLOBAL_HEADER) {
	270	avio_wb32(pb, codec->extradata_size);
	271	avio_write(pb, codec->extradata, codec->extradata_size);
	272	}
	273	write_header_chunk(s->pb, pb, MKBETAG('C', 'O', 'M', 'M'));
2ba45a60 DM	274	/* specific info */
	275	switch(codec->codec_type) {
	276	case AVMEDIA_TYPE_VIDEO:
f6fa7814 DM	277	if (st->recommended_encoder_configuration) {
	278	av_log(NULL, AV_LOG_DEBUG, "writing recommended configuration: %s\n",
	279	st->recommended_encoder_configuration);
	280	if ((ret = ffm_write_recommended_config(s->pb, codec, MKBETAG('S', '2', 'V', 'I'),
	281	st->recommended_encoder_configuration)) < 0)
	282	return ret;
	283	} else if ((ret = ffm_write_header_codec_ctx(s->pb, codec, MKBETAG('S', '2', 'V', 'I'), AV_OPT_FLAG_VIDEO_PARAM)) < 0 \|\|
	284	(ret = ffm_write_header_codec_private_ctx(s->pb, codec, AV_OPT_FLAG_VIDEO_PARAM)) < 0)
	285	return ret;
2ba45a60 DM	286	break;
2ba45a60 DM	287	case AVMEDIA_TYPE_AUDIO:
f6fa7814 DM	288	if (st->recommended_encoder_configuration) {
	289	av_log(NULL, AV_LOG_DEBUG, "writing recommended configuration: %s\n",
	290	st->recommended_encoder_configuration);
	291	if ((ret = ffm_write_recommended_config(s->pb, codec, MKBETAG('S', '2', 'A', 'U'),
	292	st->recommended_encoder_configuration)) < 0)
	293	return ret;
	294	} else if ((ret = ffm_write_header_codec_ctx(s->pb, codec, MKBETAG('S', '2', 'A', 'U'), AV_OPT_FLAG_AUDIO_PARAM)) < 0 \|\|
	295	(ret = ffm_write_header_codec_private_ctx(s->pb, codec, AV_OPT_FLAG_AUDIO_PARAM)) < 0)
	296	return ret;
2ba45a60 DM	297	break;
	298	default:
	299	return -1;
	300	}
	301	}
	302	pb = s->pb;
	303
	304	avio_wb64(pb, 0); // end of header
	305
	306	/* flush until end of block reached */
	307	while ((avio_tell(pb) % ffm->packet_size) != 0)
	308	avio_w8(pb, 0);
	309
	310	avio_flush(pb);
	311
	312	/* init packet mux */
	313	ffm->packet_ptr = ffm->packet;
	314	ffm->packet_end = ffm->packet + ffm->packet_size - FFM_HEADER_SIZE;
	315	av_assert0(ffm->packet_end >= ffm->packet);
	316	ffm->frame_offset = 0;
	317	ffm->dts = 0;
	318	ffm->first_packet = 1;
	319
	320	return 0;
	321	}
	322
	323	static int ffm_write_packet(AVFormatContext s, AVPacket pkt)
	324	{
	325	FFMContext *ffm = s->priv_data;
	326	int64_t dts;
	327	uint8_t header[FRAME_HEADER_SIZE+4];
	328	int header_size = FRAME_HEADER_SIZE;
	329
	330	dts = ffm->start_time + pkt->dts;
	331	/* packet size & key_frame */
	332	header[0] = pkt->stream_index;
	333	header[1] = 0;
	334	if (pkt->flags & AV_PKT_FLAG_KEY)
	335	header[1] \|= FLAG_KEY_FRAME;
	336	AV_WB24(header+2, pkt->size);
	337	AV_WB24(header+5, pkt->duration);
	338	AV_WB64(header+8, ffm->start_time + pkt->pts);
	339	if (pkt->pts != pkt->dts) {
	340	header[1] \|= FLAG_DTS;
	341	AV_WB32(header+16, pkt->pts - pkt->dts);
	342	header_size += 4;
	343	}
	344	ffm_write_data(s, header, header_size, dts, 1);
	345	ffm_write_data(s, pkt->data, pkt->size, dts, 0);
	346
	347	return 0;
	348	}
	349
	350	static int ffm_write_trailer(AVFormatContext *s)
	351	{
	352	FFMContext *ffm = s->priv_data;
	353
	354	/* flush packets */
	355	if (ffm->packet_ptr > ffm->packet)
	356	flush_packet(s);
	357
	358	return 0;
	359	}
	360
361	AVOutputFormat ff_ffm_muxer = {
362	.name = "ffm",
363	.long_name = NULL_IF_CONFIG_SMALL("FFM (FFserver live feed)"),
364	.extensions = "ffm",
365	.priv_data_size = sizeof(FFMContext),
366	.audio_codec = AV_CODEC_ID_MP2,
367	.video_codec = AV_CODEC_ID_MPEG1VIDEO,
368	.write_header = ffm_write_header,
369	.write_packet = ffm_write_packet,
370	.write_trailer = ffm_write_trailer,
371	.flags = AVFMT_TS_NEGATIVE,
372	};