2001-07-22 17:18:56 +03:00
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/*
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2008-05-26 06:44:31 +03:00
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* FFM (ffserver live feed) demuxer
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2009-01-19 17:46:40 +02:00
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* Copyright (c) 2001 Fabrice Bellard
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2001-07-22 17:18:56 +03:00
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*
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2011-03-18 19:35:10 +02:00
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* This file is part of Libav.
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2006-10-07 18:30:46 +03:00
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*
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2011-03-18 19:35:10 +02:00
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* Libav is free software; you can redistribute it and/or
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2002-05-26 01:31:48 +03:00
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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2006-10-07 18:30:46 +03:00
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* version 2.1 of the License, or (at your option) any later version.
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2001-07-22 17:18:56 +03:00
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*
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2011-03-18 19:35:10 +02:00
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* Libav is distributed in the hope that it will be useful,
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2001-07-22 17:18:56 +03:00
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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2002-05-26 01:31:48 +03:00
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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2001-07-22 17:18:56 +03:00
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*
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2002-05-26 01:31:48 +03:00
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* You should have received a copy of the GNU Lesser General Public
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2011-03-18 19:35:10 +02:00
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* License along with Libav; if not, write to the Free Software
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2006-01-13 00:43:26 +02:00
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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2001-07-22 17:18:56 +03:00
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*/
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2008-05-26 06:44:31 +03:00
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2009-01-12 00:19:48 +02:00
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#include "libavutil/intreadwrite.h"
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2001-07-22 17:18:56 +03:00
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#include "avformat.h"
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2008-05-26 06:44:31 +03:00
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#include "ffm.h"
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2009-01-14 01:44:16 +02:00
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#if CONFIG_FFSERVER
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2001-08-14 00:37:10 +03:00
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#include <unistd.h>
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2001-07-22 17:18:56 +03:00
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2008-10-03 13:16:29 +03:00
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int64_t ffm_read_write_index(int fd)
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2008-05-26 06:52:14 +03:00
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{
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uint8_t buf[8];
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lseek(fd, 8, SEEK_SET);
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2009-02-12 04:17:16 +02:00
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if (read(fd, buf, 8) != 8)
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return AVERROR(EIO);
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2008-05-26 06:52:14 +03:00
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return AV_RB64(buf);
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}
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2009-02-12 04:15:07 +02:00
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int ffm_write_write_index(int fd, int64_t pos)
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2008-05-26 06:52:14 +03:00
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{
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uint8_t buf[8];
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int i;
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for(i=0;i<8;i++)
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buf[i] = (pos >> (56 - i * 8)) & 0xff;
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lseek(fd, 8, SEEK_SET);
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2009-02-12 04:15:07 +02:00
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if (write(fd, buf, 8) != 8)
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return AVERROR(EIO);
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return 8;
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2008-05-26 06:52:14 +03:00
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}
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2008-10-03 13:16:29 +03:00
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void ffm_set_write_index(AVFormatContext *s, int64_t pos, int64_t file_size)
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2008-05-26 06:52:14 +03:00
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{
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FFMContext *ffm = s->priv_data;
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ffm->write_index = pos;
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ffm->file_size = file_size;
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}
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#endif // CONFIG_FFSERVER
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2001-07-22 17:18:56 +03:00
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static int ffm_is_avail_data(AVFormatContext *s, int size)
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{
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FFMContext *ffm = s->priv_data;
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2008-10-03 13:16:29 +03:00
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int64_t pos, avail_size;
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2001-07-22 17:18:56 +03:00
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int len;
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len = ffm->packet_end - ffm->packet_ptr;
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2008-05-26 06:37:01 +03:00
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if (size <= len)
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return 1;
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2011-03-03 21:11:45 +02:00
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pos = avio_tell(s->pb);
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2009-03-20 03:23:33 +02:00
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if (!ffm->write_index) {
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2009-03-20 03:39:55 +02:00
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if (pos == ffm->file_size)
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2009-03-20 03:23:33 +02:00
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return AVERROR_EOF;
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avail_size = ffm->file_size - pos;
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} else {
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2001-07-22 17:18:56 +03:00
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if (pos == ffm->write_index) {
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/* exactly at the end of stream */
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2009-03-20 03:23:33 +02:00
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return AVERROR(EAGAIN);
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2001-07-22 17:18:56 +03:00
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} else if (pos < ffm->write_index) {
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avail_size = ffm->write_index - pos;
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} else {
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avail_size = (ffm->file_size - pos) + (ffm->write_index - FFM_PACKET_SIZE);
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}
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2009-03-20 03:23:33 +02:00
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}
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2001-07-22 17:18:56 +03:00
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avail_size = (avail_size / ffm->packet_size) * (ffm->packet_size - FFM_HEADER_SIZE) + len;
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if (size <= avail_size)
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return 1;
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else
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2009-03-20 03:23:33 +02:00
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return AVERROR(EAGAIN);
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2001-07-22 17:18:56 +03:00
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}
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2009-03-20 03:44:45 +02:00
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static int ffm_resync(AVFormatContext *s, int state)
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{
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av_log(s, AV_LOG_ERROR, "resyncing\n");
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while (state != PACKET_ID) {
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2011-03-07 22:50:25 +02:00
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if (s->pb->eof_reached) {
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2009-03-20 03:44:45 +02:00
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av_log(s, AV_LOG_ERROR, "cannot find FFM syncword\n");
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return -1;
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}
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2011-02-21 17:43:01 +02:00
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state = (state << 8) | avio_r8(s->pb);
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2009-03-20 03:44:45 +02:00
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}
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return 0;
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}
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2001-07-22 17:18:56 +03:00
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/* first is true if we read the frame header */
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2002-04-08 23:58:56 +03:00
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static int ffm_read_data(AVFormatContext *s,
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2008-06-06 23:36:16 +03:00
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uint8_t *buf, int size, int header)
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2001-07-22 17:18:56 +03:00
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{
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FFMContext *ffm = s->priv_data;
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2011-02-20 12:04:12 +02:00
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AVIOContext *pb = s->pb;
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2009-03-20 03:44:45 +02:00
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int len, fill_size, size1, frame_offset, id;
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2001-07-22 17:18:56 +03:00
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size1 = size;
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while (size > 0) {
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redo:
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len = ffm->packet_end - ffm->packet_ptr;
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2008-05-26 06:53:10 +03:00
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if (len < 0)
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return -1;
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2001-07-22 17:18:56 +03:00
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if (len > size)
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len = size;
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if (len == 0) {
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2011-03-03 21:11:45 +02:00
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if (avio_tell(pb) == ffm->file_size)
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2011-02-28 15:57:54 +02:00
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avio_seek(pb, ffm->packet_size, SEEK_SET);
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2002-05-19 00:30:16 +03:00
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retry_read:
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2011-02-21 17:43:01 +02:00
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id = avio_rb16(pb); /* PACKET_ID */
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2009-03-20 03:44:45 +02:00
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if (id != PACKET_ID)
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if (ffm_resync(s, id) < 0)
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return -1;
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2011-02-21 17:43:01 +02:00
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fill_size = avio_rb16(pb);
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ffm->dts = avio_rb64(pb);
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frame_offset = avio_rb16(pb);
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avio_read(pb, ffm->packet, ffm->packet_size - FFM_HEADER_SIZE);
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2001-07-22 17:18:56 +03:00
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ffm->packet_end = ffm->packet + (ffm->packet_size - FFM_HEADER_SIZE - fill_size);
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2008-05-26 06:53:48 +03:00
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if (ffm->packet_end < ffm->packet || frame_offset < 0)
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2004-10-01 16:16:16 +03:00
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return -1;
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2001-07-22 17:18:56 +03:00
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/* if first packet or resynchronization packet, we must
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handle it specifically */
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if (ffm->first_packet || (frame_offset & 0x8000)) {
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2002-05-19 00:30:16 +03:00
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if (!frame_offset) {
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/* This packet has no frame headers in it */
|
2011-03-03 21:11:45 +02:00
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if (avio_tell(pb) >= ffm->packet_size * 3) {
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2011-02-28 15:57:54 +02:00
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avio_seek(pb, -ffm->packet_size * 2, SEEK_CUR);
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2002-05-19 00:30:16 +03:00
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goto retry_read;
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}
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/* This is bad, we cannot find a valid frame header */
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return 0;
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}
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2001-07-22 17:18:56 +03:00
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ffm->first_packet = 0;
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2008-05-27 02:59:28 +03:00
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if ((frame_offset & 0x7fff) < FFM_HEADER_SIZE)
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2004-10-01 16:16:16 +03:00
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return -1;
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2001-07-22 17:18:56 +03:00
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ffm->packet_ptr = ffm->packet + (frame_offset & 0x7fff) - FFM_HEADER_SIZE;
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2008-06-06 23:36:16 +03:00
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|
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if (!header)
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2001-07-22 17:18:56 +03:00
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break;
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} else {
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ffm->packet_ptr = ffm->packet;
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}
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goto redo;
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}
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memcpy(buf, ffm->packet_ptr, len);
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buf += len;
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ffm->packet_ptr += len;
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size -= len;
|
2008-06-06 23:36:16 +03:00
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header = 0;
|
2001-07-22 17:18:56 +03:00
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}
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return size1 - size;
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}
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2008-05-26 06:47:56 +03:00
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//#define DEBUG_SEEK
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2009-03-21 09:35:52 +02:00
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/* ensure that acutal seeking happens between FFM_PACKET_SIZE
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and file_size - FFM_PACKET_SIZE */
|
2008-10-03 13:16:29 +03:00
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static void ffm_seek1(AVFormatContext *s, int64_t pos1)
|
2008-05-26 06:50:25 +03:00
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{
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FFMContext *ffm = s->priv_data;
|
2011-02-20 12:04:12 +02:00
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AVIOContext *pb = s->pb;
|
2008-10-03 13:16:29 +03:00
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int64_t pos;
|
2008-05-26 06:50:25 +03:00
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|
2009-03-21 09:35:52 +02:00
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pos = FFMIN(pos1, ffm->file_size - FFM_PACKET_SIZE);
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pos = FFMAX(pos, FFM_PACKET_SIZE);
|
2008-05-26 06:50:25 +03:00
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#ifdef DEBUG_SEEK
|
2008-05-26 07:40:22 +03:00
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av_log(s, AV_LOG_DEBUG, "seek to %"PRIx64" -> %"PRIx64"\n", pos1, pos);
|
2008-05-26 06:50:25 +03:00
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|
#endif
|
2011-02-28 15:57:54 +02:00
|
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avio_seek(pb, pos, SEEK_SET);
|
2008-05-26 06:50:25 +03:00
|
|
|
}
|
|
|
|
|
2008-10-03 13:16:29 +03:00
|
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static int64_t get_dts(AVFormatContext *s, int64_t pos)
|
2008-05-26 06:47:07 +03:00
|
|
|
{
|
2011-02-20 12:04:12 +02:00
|
|
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AVIOContext *pb = s->pb;
|
2008-06-22 11:53:44 +03:00
|
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int64_t dts;
|
2008-05-26 06:47:07 +03:00
|
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|
|
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ffm_seek1(s, pos);
|
2011-03-15 10:14:38 +02:00
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avio_skip(pb, 4);
|
2011-02-21 17:43:01 +02:00
|
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dts = avio_rb64(pb);
|
2008-05-26 06:47:07 +03:00
|
|
|
#ifdef DEBUG_SEEK
|
2009-03-21 09:36:25 +02:00
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av_log(s, AV_LOG_DEBUG, "dts=%0.6f\n", dts / 1000000.0);
|
2008-05-26 06:47:07 +03:00
|
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|
#endif
|
2008-06-22 11:53:44 +03:00
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return dts;
|
2008-05-26 06:47:07 +03:00
|
|
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}
|
2001-07-22 17:18:56 +03:00
|
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|
|
2003-11-19 04:34:40 +02:00
|
|
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static void adjust_write_index(AVFormatContext *s)
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|
|
|
{
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|
|
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FFMContext *ffm = s->priv_data;
|
2011-02-20 12:04:12 +02:00
|
|
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AVIOContext *pb = s->pb;
|
2003-11-19 04:34:40 +02:00
|
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int64_t pts;
|
2008-10-03 13:16:29 +03:00
|
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|
//int64_t orig_write_index = ffm->write_index;
|
|
|
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int64_t pos_min, pos_max;
|
2003-11-19 04:34:40 +02:00
|
|
|
int64_t pts_start;
|
2011-03-03 21:11:45 +02:00
|
|
|
int64_t ptr = avio_tell(pb);
|
2003-11-19 04:34:40 +02:00
|
|
|
|
|
|
|
|
|
|
|
pos_min = 0;
|
|
|
|
pos_max = ffm->file_size - 2 * FFM_PACKET_SIZE;
|
|
|
|
|
2008-06-22 11:53:44 +03:00
|
|
|
pts_start = get_dts(s, pos_min);
|
2003-11-19 04:34:40 +02:00
|
|
|
|
2008-06-22 11:53:44 +03:00
|
|
|
pts = get_dts(s, pos_max);
|
2003-11-19 04:34:40 +02:00
|
|
|
|
2005-12-17 20:14:38 +02:00
|
|
|
if (pts - 100000 > pts_start)
|
2004-03-18 22:52:40 +02:00
|
|
|
goto end;
|
2003-11-19 04:34:40 +02:00
|
|
|
|
|
|
|
ffm->write_index = FFM_PACKET_SIZE;
|
|
|
|
|
2008-06-22 11:53:44 +03:00
|
|
|
pts_start = get_dts(s, pos_min);
|
2003-11-19 04:34:40 +02:00
|
|
|
|
2008-06-22 11:53:44 +03:00
|
|
|
pts = get_dts(s, pos_max);
|
2003-11-19 04:34:40 +02:00
|
|
|
|
|
|
|
if (pts - 100000 <= pts_start) {
|
|
|
|
while (1) {
|
2008-10-03 13:16:29 +03:00
|
|
|
int64_t newpos;
|
2003-11-19 04:34:40 +02:00
|
|
|
int64_t newpts;
|
|
|
|
|
|
|
|
newpos = ((pos_max + pos_min) / (2 * FFM_PACKET_SIZE)) * FFM_PACKET_SIZE;
|
|
|
|
|
|
|
|
if (newpos == pos_min)
|
|
|
|
break;
|
|
|
|
|
2008-06-22 11:53:44 +03:00
|
|
|
newpts = get_dts(s, newpos);
|
2003-11-19 04:34:40 +02:00
|
|
|
|
|
|
|
if (newpts - 100000 <= pts) {
|
|
|
|
pos_max = newpos;
|
|
|
|
pts = newpts;
|
|
|
|
} else {
|
|
|
|
pos_min = newpos;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
ffm->write_index += pos_max;
|
|
|
|
}
|
|
|
|
|
2006-11-02 00:39:58 +02:00
|
|
|
//printf("Adjusted write index from %"PRId64" to %"PRId64": pts=%0.6f\n", orig_write_index, ffm->write_index, pts / 1000000.);
|
2008-06-22 11:53:44 +03:00
|
|
|
//printf("pts range %0.6f - %0.6f\n", get_dts(s, 0) / 1000000. , get_dts(s, ffm->file_size - 2 * FFM_PACKET_SIZE) / 1000000. );
|
2003-11-19 04:34:40 +02:00
|
|
|
|
2004-03-18 22:52:40 +02:00
|
|
|
end:
|
2011-02-28 15:57:54 +02:00
|
|
|
avio_seek(pb, ptr, SEEK_SET);
|
2003-11-19 04:34:40 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
|
2010-07-25 10:54:33 +03:00
|
|
|
static int ffm_close(AVFormatContext *s)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
|
|
|
|
for (i = 0; i < s->nb_streams; i++)
|
|
|
|
av_freep(&s->streams[i]->codec->rc_eq);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2010-07-25 10:52:58 +03:00
|
|
|
|
2001-07-22 17:18:56 +03:00
|
|
|
static int ffm_read_header(AVFormatContext *s, AVFormatParameters *ap)
|
|
|
|
{
|
2002-05-20 19:31:13 +03:00
|
|
|
FFMContext *ffm = s->priv_data;
|
2001-07-22 17:18:56 +03:00
|
|
|
AVStream *st;
|
2011-02-20 12:04:12 +02:00
|
|
|
AVIOContext *pb = s->pb;
|
2001-07-22 17:18:56 +03:00
|
|
|
AVCodecContext *codec;
|
2003-08-08 20:52:30 +03:00
|
|
|
int i, nb_streams;
|
2003-02-11 18:35:48 +02:00
|
|
|
uint32_t tag;
|
2001-07-22 17:18:56 +03:00
|
|
|
|
|
|
|
/* header */
|
2011-02-21 17:43:01 +02:00
|
|
|
tag = avio_rl32(pb);
|
2001-07-22 17:18:56 +03:00
|
|
|
if (tag != MKTAG('F', 'F', 'M', '1'))
|
|
|
|
goto fail;
|
2011-02-21 17:43:01 +02:00
|
|
|
ffm->packet_size = avio_rb32(pb);
|
2001-07-22 17:18:56 +03:00
|
|
|
if (ffm->packet_size != FFM_PACKET_SIZE)
|
|
|
|
goto fail;
|
2011-02-21 17:43:01 +02:00
|
|
|
ffm->write_index = avio_rb64(pb);
|
2001-07-22 17:18:56 +03:00
|
|
|
/* get also filesize */
|
|
|
|
if (!url_is_streamed(pb)) {
|
2011-03-04 20:57:36 +02:00
|
|
|
ffm->file_size = avio_size(pb);
|
2009-03-20 03:23:33 +02:00
|
|
|
if (ffm->write_index)
|
|
|
|
adjust_write_index(s);
|
2001-07-22 17:18:56 +03:00
|
|
|
} else {
|
2006-12-07 01:46:11 +02:00
|
|
|
ffm->file_size = (UINT64_C(1) << 63) - 1;
|
2001-07-22 17:18:56 +03:00
|
|
|
}
|
|
|
|
|
2011-02-21 17:43:01 +02:00
|
|
|
nb_streams = avio_rb32(pb);
|
|
|
|
avio_rb32(pb); /* total bitrate */
|
2001-07-22 17:18:56 +03:00
|
|
|
/* read each stream */
|
2003-08-08 20:52:30 +03:00
|
|
|
for(i=0;i<nb_streams;i++) {
|
2002-09-12 05:26:58 +03:00
|
|
|
char rc_eq_buf[128];
|
|
|
|
|
2003-08-08 20:52:30 +03:00
|
|
|
st = av_new_stream(s, 0);
|
2001-07-22 17:18:56 +03:00
|
|
|
if (!st)
|
|
|
|
goto fail;
|
2005-12-17 20:14:38 +02:00
|
|
|
|
2004-05-29 05:06:32 +03:00
|
|
|
av_set_pts_info(st, 64, 1, 1000000);
|
2005-12-17 20:14:38 +02:00
|
|
|
|
2005-07-18 01:24:36 +03:00
|
|
|
codec = st->codec;
|
2001-07-22 17:18:56 +03:00
|
|
|
/* generic info */
|
2011-02-21 17:43:01 +02:00
|
|
|
codec->codec_id = avio_rb32(pb);
|
|
|
|
codec->codec_type = avio_r8(pb); /* codec_type */
|
|
|
|
codec->bit_rate = avio_rb32(pb);
|
|
|
|
st->quality = avio_rb32(pb);
|
|
|
|
codec->flags = avio_rb32(pb);
|
|
|
|
codec->flags2 = avio_rb32(pb);
|
|
|
|
codec->debug = avio_rb32(pb);
|
2001-07-22 17:18:56 +03:00
|
|
|
/* specific info */
|
|
|
|
switch(codec->codec_type) {
|
2010-03-31 02:30:55 +03:00
|
|
|
case AVMEDIA_TYPE_VIDEO:
|
2011-02-21 17:43:01 +02:00
|
|
|
codec->time_base.num = avio_rb32(pb);
|
|
|
|
codec->time_base.den = avio_rb32(pb);
|
|
|
|
codec->width = avio_rb16(pb);
|
|
|
|
codec->height = avio_rb16(pb);
|
|
|
|
codec->gop_size = avio_rb16(pb);
|
|
|
|
codec->pix_fmt = avio_rb32(pb);
|
|
|
|
codec->qmin = avio_r8(pb);
|
|
|
|
codec->qmax = avio_r8(pb);
|
|
|
|
codec->max_qdiff = avio_r8(pb);
|
|
|
|
codec->qcompress = avio_rb16(pb) / 10000.0;
|
|
|
|
codec->qblur = avio_rb16(pb) / 10000.0;
|
|
|
|
codec->bit_rate_tolerance = avio_rb32(pb);
|
2011-03-02 18:48:45 +02:00
|
|
|
avio_get_str(pb, INT_MAX, rc_eq_buf, sizeof(rc_eq_buf));
|
|
|
|
codec->rc_eq = av_strdup(rc_eq_buf);
|
2011-02-21 17:43:01 +02:00
|
|
|
codec->rc_max_rate = avio_rb32(pb);
|
|
|
|
codec->rc_min_rate = avio_rb32(pb);
|
|
|
|
codec->rc_buffer_size = avio_rb32(pb);
|
|
|
|
codec->i_quant_factor = av_int2dbl(avio_rb64(pb));
|
|
|
|
codec->b_quant_factor = av_int2dbl(avio_rb64(pb));
|
|
|
|
codec->i_quant_offset = av_int2dbl(avio_rb64(pb));
|
|
|
|
codec->b_quant_offset = av_int2dbl(avio_rb64(pb));
|
|
|
|
codec->dct_algo = avio_rb32(pb);
|
|
|
|
codec->strict_std_compliance = avio_rb32(pb);
|
|
|
|
codec->max_b_frames = avio_rb32(pb);
|
|
|
|
codec->luma_elim_threshold = avio_rb32(pb);
|
|
|
|
codec->chroma_elim_threshold = avio_rb32(pb);
|
|
|
|
codec->mpeg_quant = avio_rb32(pb);
|
|
|
|
codec->intra_dc_precision = avio_rb32(pb);
|
|
|
|
codec->me_method = avio_rb32(pb);
|
|
|
|
codec->mb_decision = avio_rb32(pb);
|
|
|
|
codec->nsse_weight = avio_rb32(pb);
|
|
|
|
codec->frame_skip_cmp = avio_rb32(pb);
|
|
|
|
codec->rc_buffer_aggressivity = av_int2dbl(avio_rb64(pb));
|
|
|
|
codec->codec_tag = avio_rb32(pb);
|
|
|
|
codec->thread_count = avio_r8(pb);
|
|
|
|
codec->coder_type = avio_rb32(pb);
|
|
|
|
codec->me_cmp = avio_rb32(pb);
|
|
|
|
codec->partitions = avio_rb32(pb);
|
|
|
|
codec->me_subpel_quality = avio_rb32(pb);
|
|
|
|
codec->me_range = avio_rb32(pb);
|
|
|
|
codec->keyint_min = avio_rb32(pb);
|
|
|
|
codec->scenechange_threshold = avio_rb32(pb);
|
|
|
|
codec->b_frame_strategy = avio_rb32(pb);
|
|
|
|
codec->qcompress = av_int2dbl(avio_rb64(pb));
|
|
|
|
codec->qblur = av_int2dbl(avio_rb64(pb));
|
|
|
|
codec->max_qdiff = avio_rb32(pb);
|
|
|
|
codec->refs = avio_rb32(pb);
|
|
|
|
codec->directpred = avio_rb32(pb);
|
2001-07-22 17:18:56 +03:00
|
|
|
break;
|
2010-03-31 02:30:55 +03:00
|
|
|
case AVMEDIA_TYPE_AUDIO:
|
2011-02-21 17:43:01 +02:00
|
|
|
codec->sample_rate = avio_rb32(pb);
|
|
|
|
codec->channels = avio_rl16(pb);
|
|
|
|
codec->frame_size = avio_rl16(pb);
|
|
|
|
codec->sample_fmt = (int16_t) avio_rl16(pb);
|
2001-07-22 17:18:56 +03:00
|
|
|
break;
|
2002-05-09 04:18:08 +03:00
|
|
|
default:
|
2002-09-12 05:26:58 +03:00
|
|
|
goto fail;
|
2001-07-22 17:18:56 +03:00
|
|
|
}
|
2008-06-09 03:36:27 +03:00
|
|
|
if (codec->flags & CODEC_FLAG_GLOBAL_HEADER) {
|
2011-02-21 17:43:01 +02:00
|
|
|
codec->extradata_size = avio_rb32(pb);
|
2008-06-09 03:36:27 +03:00
|
|
|
codec->extradata = av_malloc(codec->extradata_size);
|
|
|
|
if (!codec->extradata)
|
|
|
|
return AVERROR(ENOMEM);
|
2011-02-21 17:43:01 +02:00
|
|
|
avio_read(pb, codec->extradata, codec->extradata_size);
|
2008-06-09 03:36:27 +03:00
|
|
|
}
|
2001-07-22 17:18:56 +03:00
|
|
|
}
|
|
|
|
|
|
|
|
/* get until end of block reached */
|
2011-03-03 21:11:45 +02:00
|
|
|
while ((avio_tell(pb) % ffm->packet_size) != 0)
|
2011-02-21 17:43:01 +02:00
|
|
|
avio_r8(pb);
|
2001-07-22 17:18:56 +03:00
|
|
|
|
|
|
|
/* init packet demux */
|
|
|
|
ffm->packet_ptr = ffm->packet;
|
|
|
|
ffm->packet_end = ffm->packet;
|
|
|
|
ffm->frame_offset = 0;
|
2008-06-22 11:53:44 +03:00
|
|
|
ffm->dts = 0;
|
2001-07-22 17:18:56 +03:00
|
|
|
ffm->read_state = READ_HEADER;
|
|
|
|
ffm->first_packet = 1;
|
|
|
|
return 0;
|
|
|
|
fail:
|
2010-07-25 10:52:58 +03:00
|
|
|
ffm_close(s);
|
2001-07-22 17:18:56 +03:00
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* return < 0 if eof */
|
|
|
|
static int ffm_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
|
|
{
|
|
|
|
int size;
|
|
|
|
FFMContext *ffm = s->priv_data;
|
2009-03-20 03:23:33 +02:00
|
|
|
int duration, ret;
|
2009-02-02 00:02:57 +02:00
|
|
|
|
2001-07-22 17:18:56 +03:00
|
|
|
switch(ffm->read_state) {
|
|
|
|
case READ_HEADER:
|
2009-03-20 03:23:33 +02:00
|
|
|
if ((ret = ffm_is_avail_data(s, FRAME_HEADER_SIZE+4)) < 0)
|
|
|
|
return ret;
|
|
|
|
|
2011-01-29 18:46:18 +02:00
|
|
|
av_dlog(s, "pos=%08"PRIx64" spos=%"PRIx64", write_index=%"PRIx64" size=%"PRIx64"\n",
|
2011-03-03 21:11:45 +02:00
|
|
|
avio_tell(s->pb), s->pb->pos, ffm->write_index, ffm->file_size);
|
2005-12-17 20:14:38 +02:00
|
|
|
if (ffm_read_data(s, ffm->header, FRAME_HEADER_SIZE, 1) !=
|
2002-05-26 01:31:48 +03:00
|
|
|
FRAME_HEADER_SIZE)
|
2009-03-20 03:23:33 +02:00
|
|
|
return -1;
|
2008-06-09 10:43:14 +03:00
|
|
|
if (ffm->header[1] & FLAG_DTS)
|
|
|
|
if (ffm_read_data(s, ffm->header+16, 4, 1) != 4)
|
2009-03-20 03:23:33 +02:00
|
|
|
return -1;
|
2001-07-22 17:18:56 +03:00
|
|
|
#if 0
|
2008-05-26 07:38:46 +03:00
|
|
|
av_hexdump_log(s, AV_LOG_DEBUG, ffm->header, FRAME_HEADER_SIZE);
|
2001-07-22 17:18:56 +03:00
|
|
|
#endif
|
|
|
|
ffm->read_state = READ_DATA;
|
|
|
|
/* fall thru */
|
|
|
|
case READ_DATA:
|
2007-07-06 12:32:34 +03:00
|
|
|
size = AV_RB24(ffm->header + 2);
|
2009-03-20 03:23:33 +02:00
|
|
|
if ((ret = ffm_is_avail_data(s, size)) < 0)
|
|
|
|
return ret;
|
2001-07-22 17:18:56 +03:00
|
|
|
|
2007-07-06 12:32:34 +03:00
|
|
|
duration = AV_RB24(ffm->header + 5);
|
2002-05-09 04:18:08 +03:00
|
|
|
|
2001-07-22 17:18:56 +03:00
|
|
|
av_new_packet(pkt, size);
|
|
|
|
pkt->stream_index = ffm->header[0];
|
2008-05-22 00:04:42 +03:00
|
|
|
if ((unsigned)pkt->stream_index >= s->nb_streams) {
|
|
|
|
av_log(s, AV_LOG_ERROR, "invalid stream index %d\n", pkt->stream_index);
|
|
|
|
av_free_packet(pkt);
|
|
|
|
ffm->read_state = READ_HEADER;
|
2009-03-20 03:23:33 +02:00
|
|
|
return -1;
|
2008-05-22 00:04:42 +03:00
|
|
|
}
|
2011-03-03 21:11:45 +02:00
|
|
|
pkt->pos = avio_tell(s->pb);
|
2001-07-22 17:18:56 +03:00
|
|
|
if (ffm->header[1] & FLAG_KEY_FRAME)
|
2010-03-31 15:29:58 +03:00
|
|
|
pkt->flags |= AV_PKT_FLAG_KEY;
|
2002-04-08 23:58:56 +03:00
|
|
|
|
2001-07-22 17:18:56 +03:00
|
|
|
ffm->read_state = READ_HEADER;
|
|
|
|
if (ffm_read_data(s, pkt->data, size, 0) != size) {
|
|
|
|
/* bad case: desynchronized packet. we cancel all the packet loading */
|
|
|
|
av_free_packet(pkt);
|
2009-03-20 03:23:33 +02:00
|
|
|
return -1;
|
2001-07-22 17:18:56 +03:00
|
|
|
}
|
2008-06-09 10:43:14 +03:00
|
|
|
pkt->pts = AV_RB64(ffm->header+8);
|
|
|
|
if (ffm->header[1] & FLAG_DTS)
|
|
|
|
pkt->dts = pkt->pts - AV_RB32(ffm->header+16);
|
|
|
|
else
|
|
|
|
pkt->dts = pkt->pts;
|
2002-05-09 04:18:08 +03:00
|
|
|
pkt->duration = duration;
|
2001-07-22 17:18:56 +03:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* seek to a given time in the file. The file read pointer is
|
2008-01-09 01:08:51 +02:00
|
|
|
positioned at or before pts. XXX: the following code is quite
|
2001-07-22 17:18:56 +03:00
|
|
|
approximative */
|
2004-10-12 02:53:53 +03:00
|
|
|
static int ffm_seek(AVFormatContext *s, int stream_index, int64_t wanted_pts, int flags)
|
2001-07-22 17:18:56 +03:00
|
|
|
{
|
|
|
|
FFMContext *ffm = s->priv_data;
|
2008-10-03 13:16:29 +03:00
|
|
|
int64_t pos_min, pos_max, pos;
|
2003-02-11 18:35:48 +02:00
|
|
|
int64_t pts_min, pts_max, pts;
|
2001-07-22 17:18:56 +03:00
|
|
|
double pos1;
|
|
|
|
|
|
|
|
#ifdef DEBUG_SEEK
|
2008-05-26 07:40:22 +03:00
|
|
|
av_log(s, AV_LOG_DEBUG, "wanted_pts=%0.6f\n", wanted_pts / 1000000.0);
|
2001-07-22 17:18:56 +03:00
|
|
|
#endif
|
|
|
|
/* find the position using linear interpolation (better than
|
|
|
|
dichotomy in typical cases) */
|
2009-03-21 09:35:52 +02:00
|
|
|
pos_min = FFM_PACKET_SIZE;
|
|
|
|
pos_max = ffm->file_size - FFM_PACKET_SIZE;
|
2001-07-22 17:18:56 +03:00
|
|
|
while (pos_min <= pos_max) {
|
2008-06-22 11:53:44 +03:00
|
|
|
pts_min = get_dts(s, pos_min);
|
|
|
|
pts_max = get_dts(s, pos_max);
|
2001-07-22 17:18:56 +03:00
|
|
|
/* linear interpolation */
|
2002-04-08 23:58:56 +03:00
|
|
|
pos1 = (double)(pos_max - pos_min) * (double)(wanted_pts - pts_min) /
|
2001-07-22 17:18:56 +03:00
|
|
|
(double)(pts_max - pts_min);
|
2003-02-11 18:35:48 +02:00
|
|
|
pos = (((int64_t)pos1) / FFM_PACKET_SIZE) * FFM_PACKET_SIZE;
|
2001-07-22 17:18:56 +03:00
|
|
|
if (pos <= pos_min)
|
|
|
|
pos = pos_min;
|
|
|
|
else if (pos >= pos_max)
|
|
|
|
pos = pos_max;
|
2008-06-22 11:53:44 +03:00
|
|
|
pts = get_dts(s, pos);
|
2001-07-22 17:18:56 +03:00
|
|
|
/* check if we are lucky */
|
|
|
|
if (pts == wanted_pts) {
|
|
|
|
goto found;
|
|
|
|
} else if (pts > wanted_pts) {
|
|
|
|
pos_max = pos - FFM_PACKET_SIZE;
|
|
|
|
} else {
|
|
|
|
pos_min = pos + FFM_PACKET_SIZE;
|
|
|
|
}
|
|
|
|
}
|
2004-10-12 02:53:53 +03:00
|
|
|
pos = (flags & AVSEEK_FLAG_BACKWARD) ? pos_min : pos_max;
|
2009-03-21 09:35:52 +02:00
|
|
|
|
2001-07-22 17:18:56 +03:00
|
|
|
found:
|
|
|
|
ffm_seek1(s, pos);
|
2008-06-07 03:35:37 +03:00
|
|
|
|
|
|
|
/* reset read state */
|
|
|
|
ffm->read_state = READ_HEADER;
|
|
|
|
ffm->packet_ptr = ffm->packet;
|
|
|
|
ffm->packet_end = ffm->packet;
|
|
|
|
ffm->first_packet = 1;
|
|
|
|
|
2001-07-22 17:18:56 +03:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2002-05-24 05:06:51 +03:00
|
|
|
static int ffm_probe(AVProbeData *p)
|
|
|
|
{
|
2007-04-08 14:34:15 +03:00
|
|
|
if (
|
2005-12-17 20:14:38 +02:00
|
|
|
p->buf[0] == 'F' && p->buf[1] == 'F' && p->buf[2] == 'M' &&
|
2002-05-26 01:31:48 +03:00
|
|
|
p->buf[3] == '1')
|
2002-05-24 05:06:51 +03:00
|
|
|
return AVPROBE_SCORE_MAX + 1;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
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2011-01-26 00:03:28 +02:00
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AVInputFormat ff_ffm_demuxer = {
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2002-05-20 19:31:13 +03:00
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"ffm",
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2008-07-27 23:59:40 +03:00
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NULL_IF_CONFIG_SMALL("FFM (FFserver live feed) format"),
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2002-05-26 01:31:48 +03:00
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sizeof(FFMContext),
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2002-05-24 05:06:51 +03:00
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ffm_probe,
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2002-05-20 19:31:13 +03:00
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ffm_read_header,
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ffm_read_packet,
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2010-03-10 15:17:50 +02:00
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ffm_close,
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2002-05-20 19:31:13 +03:00
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ffm_seek,
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};
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