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/*
* 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 "avformat.h"
#include "ffm.h"
/* disable pts hack for testing */
int ffm_nopts = 0;
static void flush_packet(AVFormatContext *s)
{
FFMContext *ffm = s->priv_data;
int fill_size, h;
ByteIOContext *pb = s->pb;
fill_size = ffm->packet_end - ffm->packet_ptr;
memset(ffm->packet_ptr, 0, fill_size);
if (url_ftell(pb) % ffm->packet_size)
av_abort();
/* put header */
put_be16(pb, PACKET_ID);
put_be16(pb, fill_size);
put_be64(pb, ffm->pts);
h = ffm->frame_offset;
if (ffm->first_packet)
h |= 0x8000;
put_be16(pb, h);
put_buffer(pb, ffm->packet, ffm->packet_end - ffm->packet);
put_flush_packet(pb);
/* prepare next packet */
ffm->frame_offset = 0; /* no key frame */
ffm->pts = 0; /* no pts */
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 pts, 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;
if (header && ffm->pts == 0)
ffm->pts = pts;
/* 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) {
/* special case : no pts in packet : we leave the current one */
if (ffm->pts == 0)
ffm->pts = pts;
flush_packet(s);
}
}
}
static int ffm_write_header(AVFormatContext *s)
{
FFMContext *ffm = s->priv_data;
AVStream *st;
ByteIOContext *pb = s->pb;
AVCodecContext *codec;
int bit_rate, i;
ffm->packet_size = FFM_PACKET_SIZE;
/* header */
put_le32(pb, MKTAG('F', 'F', 'M', '1'));
put_be32(pb, ffm->packet_size);
/* XXX: store write position in other file ? */
put_be64(pb, ffm->packet_size); /* current write position */
put_be32(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;
}
put_be32(pb, bit_rate);
/* list of streams */
for(i=0;i<s->nb_streams;i++) {
st = s->streams[i];
av_set_pts_info(st, 64, 1, 1000000);
codec = st->codec;
/* generic info */
put_be32(pb, codec->codec_id);
put_byte(pb, codec->codec_type);
put_be32(pb, codec->bit_rate);
put_be32(pb, st->quality);
put_be32(pb, codec->flags);
put_be32(pb, codec->flags2);
put_be32(pb, codec->debug);
/* specific info */
switch(codec->codec_type) {
case CODEC_TYPE_VIDEO:
put_be32(pb, codec->time_base.num);
put_be32(pb, codec->time_base.den);
put_be16(pb, codec->width);
put_be16(pb, codec->height);
put_be16(pb, codec->gop_size);
put_be32(pb, codec->pix_fmt);
put_byte(pb, codec->qmin);
put_byte(pb, codec->qmax);
put_byte(pb, codec->max_qdiff);
put_be16(pb, (int) (codec->qcompress * 10000.0));
put_be16(pb, (int) (codec->qblur * 10000.0));
put_be32(pb, codec->bit_rate_tolerance);
put_strz(pb, codec->rc_eq);
put_be32(pb, codec->rc_max_rate);
put_be32(pb, codec->rc_min_rate);
put_be32(pb, codec->rc_buffer_size);
put_be64(pb, av_dbl2int(codec->i_quant_factor));
put_be64(pb, av_dbl2int(codec->b_quant_factor));
put_be64(pb, av_dbl2int(codec->i_quant_offset));
put_be64(pb, av_dbl2int(codec->b_quant_offset));
put_be32(pb, codec->dct_algo);
put_be32(pb, codec->strict_std_compliance);
put_be32(pb, codec->max_b_frames);
put_be32(pb, codec->luma_elim_threshold);
put_be32(pb, codec->chroma_elim_threshold);
put_be32(pb, codec->mpeg_quant);
put_be32(pb, codec->intra_dc_precision);
put_be32(pb, codec->me_method);
put_be32(pb, codec->mb_decision);
put_be32(pb, codec->nsse_weight);
put_be32(pb, codec->frame_skip_cmp);
put_be64(pb, av_dbl2int(codec->rc_buffer_aggressivity));
put_be32(pb, codec->codec_tag);
break;
case CODEC_TYPE_AUDIO:
put_be32(pb, codec->sample_rate);
put_le16(pb, codec->channels);
put_le16(pb, codec->frame_size);
break;
default:
return -1;
}
}
/* hack to have real time */
if (ffm_nopts)
ffm->start_time = 0;
else
ffm->start_time = av_gettime();
/* flush until end of block reached */
while ((url_ftell(pb) % ffm->packet_size) != 0)
put_byte(pb, 0);
put_flush_packet(pb);
/* init packet mux */
ffm->packet_ptr = ffm->packet;
ffm->packet_end = ffm->packet + ffm->packet_size - FFM_HEADER_SIZE;
assert(ffm->packet_end >= ffm->packet);
ffm->frame_offset = 0;
ffm->pts = 0;
ffm->first_packet = 1;
return 0;
}
static int ffm_write_packet(AVFormatContext *s, AVPacket *pkt)
{
FFMContext *ffm = s->priv_data;
AVStream *st = s->streams[pkt->stream_index];
int64_t pts;
uint8_t header[FRAME_HEADER_SIZE];
pts = ffm->start_time + pkt->pts;
/* packet size & key_frame */
header[0] = pkt->stream_index;
header[1] = 0;
if (pkt->flags & PKT_FLAG_KEY)
header[1] |= FLAG_KEY_FRAME;
AV_WB24(header+2, pkt->size);
AV_WB24(header+5, pkt->duration);
ffm_write_data(s, header, FRAME_HEADER_SIZE, pts, 1);
ffm_write_data(s, pkt->data, pkt->size, pts, 0);
return 0;
}
static int ffm_write_trailer(AVFormatContext *s)
{
ByteIOContext *pb = s->pb;
FFMContext *ffm = s->priv_data;
/* flush packets */
if (ffm->packet_ptr > ffm->packet)
flush_packet(s);
put_flush_packet(pb);
if (!url_is_streamed(pb)) {
int64_t size;
/* update the write offset */
size = url_ftell(pb);
url_fseek(pb, 8, SEEK_SET);
put_be64(pb, size);
put_flush_packet(pb);
}
return 0;
}
AVOutputFormat ffm_muxer = {
"ffm",
NULL_IF_CONFIG_SMALL("ffm format"),
"",
"ffm",
sizeof(FFMContext),
/* not really used */
CODEC_ID_MP2,
CODEC_ID_MPEG1VIDEO,
ffm_write_header,
ffm_write_packet,
ffm_write_trailer,
};
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