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FFmpeg/libavformat/ffmenc.c
Clément Bœsch f7c46d251c ffserver: fix seeking with ?date=... 
Regression since 5f847bf61d.

After this commit, timestamps pushed by FFmpeg won't be relative
anymore, but absolute (based on the date/time at the beginning of the
push). This will allow seeking to work properly. Before this patch, the
seek was done, but ffm timestamps were way smallers than the absolute
requested timestamp (based on a date), so the seek was done, but to the
end of the stream (which was similar to no effect at all).
2012-10-08 09:03:19 +02:00

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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 "libavutil/intreadwrite.h"
#include "libavutil/intfloat.h"
#include "libavutil/avassert.h"
#include "libavutil/parseutils.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 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;
if (t = av_dict_get(s->metadata, "creation_time", NULL, 0)) {
int 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', '1'));
avio_wb32(pb, ffm->packet_size);
avio_wb64(pb, 0); /* current write position */
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);
/* list of streams */
for(i=0;i<s->nb_streams;i++) {
st = s->streams[i];
avpriv_set_pts_info(st, 64, 1, 1000000);
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);
/* specific info */
switch(codec->codec_type) {
case AVMEDIA_TYPE_VIDEO:
avio_wb32(pb, codec->time_base.num);
avio_wb32(pb, codec->time_base.den);
avio_wb16(pb, codec->width);
avio_wb16(pb, codec->height);
avio_wb16(pb, codec->gop_size);
avio_wb32(pb, codec->pix_fmt);
avio_w8(pb, codec->qmin);
avio_w8(pb, codec->qmax);
avio_w8(pb, codec->max_qdiff);
avio_wb16(pb, (int) (codec->qcompress * 10000.0));
avio_wb16(pb, (int) (codec->qblur * 10000.0));
avio_wb32(pb, codec->bit_rate_tolerance);
avio_put_str(pb, codec->rc_eq ? codec->rc_eq : "tex^qComp");
avio_wb32(pb, codec->rc_max_rate);
avio_wb32(pb, codec->rc_min_rate);
avio_wb32(pb, codec->rc_buffer_size);
avio_wb64(pb, av_double2int(codec->i_quant_factor));
avio_wb64(pb, av_double2int(codec->b_quant_factor));
avio_wb64(pb, av_double2int(codec->i_quant_offset));
avio_wb64(pb, av_double2int(codec->b_quant_offset));
avio_wb32(pb, codec->dct_algo);
avio_wb32(pb, codec->strict_std_compliance);
avio_wb32(pb, codec->max_b_frames);
avio_wb32(pb, codec->mpeg_quant);
avio_wb32(pb, codec->intra_dc_precision);
avio_wb32(pb, codec->me_method);
avio_wb32(pb, codec->mb_decision);
avio_wb32(pb, codec->nsse_weight);
avio_wb32(pb, codec->frame_skip_cmp);
avio_wb64(pb, av_double2int(codec->rc_buffer_aggressivity));
avio_wb32(pb, codec->codec_tag);
avio_w8(pb, codec->thread_count);
avio_wb32(pb, codec->coder_type);
avio_wb32(pb, codec->me_cmp);
avio_wb32(pb, codec->me_subpel_quality);
avio_wb32(pb, codec->me_range);
avio_wb32(pb, codec->keyint_min);
avio_wb32(pb, codec->scenechange_threshold);
avio_wb32(pb, codec->b_frame_strategy);
avio_wb64(pb, av_double2int(codec->qcompress));
avio_wb64(pb, av_double2int(codec->qblur));
avio_wb32(pb, codec->max_qdiff);
avio_wb32(pb, codec->refs);
break;
case AVMEDIA_TYPE_AUDIO:
avio_wb32(pb, codec->sample_rate);
avio_wl16(pb, codec->channels);
avio_wl16(pb, codec->frame_size);
break;
default:
return -1;
}
if (codec->flags & CODEC_FLAG_GLOBAL_HEADER) {
avio_wb32(pb, codec->extradata_size);
avio_write(pb, codec->extradata, codec->extradata_size);
}
}
/* 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,
};
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