2001-07-22 14:18:56 +00:00
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/*
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2008-05-26 03:44:31 +00:00
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* FFM (ffserver live feed) demuxer
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2002-05-25 22:31:48 +00:00
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* Copyright (c) 2001 Fabrice Bellard.
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2001-07-22 14:18:56 +00:00
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*
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2006-10-07 15:30:46 +00:00
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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2002-05-25 22:31:48 +00:00
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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 15:30:46 +00:00
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* version 2.1 of the License, or (at your option) any later version.
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2001-07-22 14:18:56 +00:00
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*
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2006-10-07 15:30:46 +00:00
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* FFmpeg is distributed in the hope that it will be useful,
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2001-07-22 14:18:56 +00:00
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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2002-05-25 22:31:48 +00:00
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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 14:18:56 +00:00
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*
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2002-05-25 22:31:48 +00:00
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* You should have received a copy of the GNU Lesser General Public
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2006-10-07 15:30:46 +00:00
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* License along with FFmpeg; if not, write to the Free Software
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2006-01-12 22:43:26 +00:00
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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2001-07-22 14:18:56 +00:00
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*/
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2008-05-26 03:44:31 +00:00
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2001-07-22 14:18:56 +00:00
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#include "avformat.h"
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2008-05-26 03:44:31 +00:00
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#include "ffm.h"
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2008-05-26 03:52:14 +00:00
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#ifdef CONFIG_FFSERVER
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2001-08-13 21:37:10 +00:00
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#include <unistd.h>
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2001-07-22 14:18:56 +00:00
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2008-05-26 03:52:14 +00:00
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offset_t ffm_read_write_index(int fd)
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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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read(fd, buf, 8);
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return AV_RB64(buf);
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}
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void ffm_write_write_index(int fd, offset_t pos)
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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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write(fd, buf, 8);
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}
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void ffm_set_write_index(AVFormatContext *s, offset_t pos, offset_t file_size)
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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 14:18:56 +00:00
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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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offset_t pos, avail_size;
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int len;
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len = ffm->packet_end - ffm->packet_ptr;
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2008-05-26 03:37:01 +00:00
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if (size <= len)
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return 1;
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2007-11-21 07:41:00 +00:00
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pos = url_ftell(s->pb);
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2001-07-22 14:18:56 +00:00
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if (pos == ffm->write_index) {
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/* exactly at the end of stream */
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return 0;
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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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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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return 0;
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}
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/* first is true if we read the frame header */
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2002-04-08 20:58:56 +00:00
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static int ffm_read_data(AVFormatContext *s,
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2003-02-11 16:35:48 +00:00
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uint8_t *buf, int size, int first)
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2001-07-22 14:18:56 +00:00
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{
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FFMContext *ffm = s->priv_data;
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2007-11-21 07:41:00 +00:00
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ByteIOContext *pb = s->pb;
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2001-07-22 14:18:56 +00:00
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int len, fill_size, size1, frame_offset;
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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 03:53:10 +00:00
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if (len < 0)
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return -1;
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2001-07-22 14:18:56 +00:00
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if (len > size)
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len = size;
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if (len == 0) {
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if (url_ftell(pb) == ffm->file_size)
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url_fseek(pb, ffm->packet_size, SEEK_SET);
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2002-05-18 21:30:16 +00:00
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retry_read:
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2001-07-22 14:18:56 +00:00
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get_be16(pb); /* PACKET_ID */
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fill_size = get_be16(pb);
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ffm->pts = get_be64(pb);
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2006-01-19 00:54:10 +00:00
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ffm->first_frame_in_packet = 1;
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2001-07-22 14:18:56 +00:00
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frame_offset = get_be16(pb);
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get_buffer(pb, ffm->packet, ffm->packet_size - FFM_HEADER_SIZE);
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ffm->packet_end = ffm->packet + (ffm->packet_size - FFM_HEADER_SIZE - fill_size);
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2008-05-26 03:53:48 +00:00
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if (ffm->packet_end < ffm->packet || frame_offset < 0)
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2004-10-01 13:16:16 +00:00
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return -1;
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2001-07-22 14:18:56 +00:00
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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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2002-05-18 21:30:16 +00:00
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if (!frame_offset) {
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/* This packet has no frame headers in it */
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if (url_ftell(pb) >= ffm->packet_size * 3) {
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url_fseek(pb, -ffm->packet_size * 2, SEEK_CUR);
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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 14:18:56 +00:00
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ffm->first_packet = 0;
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2002-05-18 21:30:16 +00:00
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if ((frame_offset & 0x7ffff) < FFM_HEADER_SIZE)
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2004-10-01 13:16:16 +00:00
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return -1;
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2001-07-22 14:18:56 +00:00
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ffm->packet_ptr = ffm->packet + (frame_offset & 0x7fff) - FFM_HEADER_SIZE;
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if (!first)
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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;
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first = 0;
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}
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return size1 - size;
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}
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2008-05-26 03:47:56 +00:00
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//#define DEBUG_SEEK
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2008-05-26 03:50:25 +00:00
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/* pos is between 0 and file_size - FFM_PACKET_SIZE. It is translated
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by the write position inside this function */
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static void ffm_seek1(AVFormatContext *s, offset_t pos1)
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{
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FFMContext *ffm = s->priv_data;
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ByteIOContext *pb = s->pb;
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offset_t pos;
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pos = pos1 + ffm->write_index;
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if (pos >= ffm->file_size)
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pos -= (ffm->file_size - FFM_PACKET_SIZE);
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#ifdef DEBUG_SEEK
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2008-05-26 04:40:22 +00:00
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av_log(s, AV_LOG_DEBUG, "seek to %"PRIx64" -> %"PRIx64"\n", pos1, pos);
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2008-05-26 03:50:25 +00:00
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#endif
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url_fseek(pb, pos, SEEK_SET);
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}
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2008-05-26 03:47:07 +00:00
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static int64_t get_pts(AVFormatContext *s, offset_t pos)
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{
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ByteIOContext *pb = s->pb;
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int64_t pts;
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ffm_seek1(s, pos);
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url_fskip(pb, 4);
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pts = get_be64(pb);
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#ifdef DEBUG_SEEK
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2008-05-26 04:40:22 +00:00
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av_log(s, AV_LOG_DEBUG, "pts=%0.6f\n", pts / 1000000.0);
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2008-05-26 03:47:07 +00:00
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#endif
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return pts;
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}
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2001-07-22 14:18:56 +00:00
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2003-11-19 02:34:40 +00:00
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static void adjust_write_index(AVFormatContext *s)
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{
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FFMContext *ffm = s->priv_data;
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2007-11-21 07:41:00 +00:00
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ByteIOContext *pb = s->pb;
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2003-11-19 02:34:40 +00:00
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int64_t pts;
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//offset_t orig_write_index = ffm->write_index;
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offset_t pos_min, pos_max;
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int64_t pts_start;
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offset_t ptr = url_ftell(pb);
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pos_min = 0;
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pos_max = ffm->file_size - 2 * FFM_PACKET_SIZE;
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pts_start = get_pts(s, pos_min);
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pts = get_pts(s, pos_max);
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2005-12-17 18:14:38 +00:00
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if (pts - 100000 > pts_start)
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2004-03-18 20:52:40 +00:00
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goto end;
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2003-11-19 02:34:40 +00:00
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ffm->write_index = FFM_PACKET_SIZE;
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pts_start = get_pts(s, pos_min);
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pts = get_pts(s, pos_max);
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if (pts - 100000 <= pts_start) {
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while (1) {
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offset_t newpos;
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int64_t newpts;
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newpos = ((pos_max + pos_min) / (2 * FFM_PACKET_SIZE)) * FFM_PACKET_SIZE;
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if (newpos == pos_min)
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break;
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newpts = get_pts(s, newpos);
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if (newpts - 100000 <= pts) {
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pos_max = newpos;
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pts = newpts;
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} else {
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pos_min = newpos;
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}
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}
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ffm->write_index += pos_max;
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}
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|
2006-11-01 22:39:58 +00:00
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//printf("Adjusted write index from %"PRId64" to %"PRId64": pts=%0.6f\n", orig_write_index, ffm->write_index, pts / 1000000.);
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2003-11-19 02:34:40 +00:00
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//printf("pts range %0.6f - %0.6f\n", get_pts(s, 0) / 1000000. , get_pts(s, ffm->file_size - 2 * FFM_PACKET_SIZE) / 1000000. );
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2004-03-18 20:52:40 +00:00
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end:
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2003-11-19 02:34:40 +00:00
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url_fseek(pb, ptr, SEEK_SET);
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}
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|
2001-07-22 14:18:56 +00:00
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static int ffm_read_header(AVFormatContext *s, AVFormatParameters *ap)
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{
|
2002-05-20 16:31:13 +00:00
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FFMContext *ffm = s->priv_data;
|
2001-07-22 14:18:56 +00:00
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AVStream *st;
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FFMStream *fst;
|
2007-11-21 07:41:00 +00:00
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ByteIOContext *pb = s->pb;
|
2001-07-22 14:18:56 +00:00
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AVCodecContext *codec;
|
2003-08-08 17:52:30 +00:00
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int i, nb_streams;
|
2003-02-11 16:35:48 +00:00
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uint32_t tag;
|
2001-07-22 14:18:56 +00:00
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/* header */
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tag = get_le32(pb);
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if (tag != MKTAG('F', 'F', 'M', '1'))
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goto fail;
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ffm->packet_size = get_be32(pb);
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if (ffm->packet_size != FFM_PACKET_SIZE)
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goto fail;
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ffm->write_index = get_be64(pb);
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/* get also filesize */
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if (!url_is_streamed(pb)) {
|
2005-05-19 00:06:27 +00:00
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ffm->file_size = url_fsize(pb);
|
2003-11-19 02:34:40 +00:00
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adjust_write_index(s);
|
2001-07-22 14:18:56 +00:00
|
|
|
} else {
|
2006-12-06 23:46:11 +00:00
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|
ffm->file_size = (UINT64_C(1) << 63) - 1;
|
2001-07-22 14:18:56 +00:00
|
|
|
}
|
|
|
|
|
2003-08-08 17:52:30 +00:00
|
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nb_streams = get_be32(pb);
|
2001-07-22 14:18:56 +00:00
|
|
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get_be32(pb); /* total bitrate */
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|
|
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/* read each stream */
|
2003-08-08 17:52:30 +00:00
|
|
|
for(i=0;i<nb_streams;i++) {
|
2002-09-12 02:26:58 +00:00
|
|
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char rc_eq_buf[128];
|
|
|
|
|
2003-08-08 17:52:30 +00:00
|
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st = av_new_stream(s, 0);
|
2001-07-22 14:18:56 +00:00
|
|
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if (!st)
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goto fail;
|
2002-06-05 02:21:10 +00:00
|
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|
fst = av_mallocz(sizeof(FFMStream));
|
2001-07-22 14:18:56 +00:00
|
|
|
if (!fst)
|
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|
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goto fail;
|
2005-10-12 23:25:15 +00:00
|
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|
s->streams[i] = st;
|
2005-12-17 18:14:38 +00:00
|
|
|
|
2004-05-29 02:06:32 +00:00
|
|
|
av_set_pts_info(st, 64, 1, 1000000);
|
2005-12-17 18:14:38 +00:00
|
|
|
|
2001-07-22 14:18:56 +00:00
|
|
|
st->priv_data = fst;
|
|
|
|
|
2005-07-17 22:24:36 +00:00
|
|
|
codec = st->codec;
|
2001-07-22 14:18:56 +00:00
|
|
|
/* generic info */
|
2005-10-12 23:25:15 +00:00
|
|
|
codec->codec_id = get_be32(pb);
|
|
|
|
codec->codec_type = get_byte(pb); /* codec_type */
|
2001-07-22 14:18:56 +00:00
|
|
|
codec->bit_rate = get_be32(pb);
|
2005-10-12 23:25:15 +00:00
|
|
|
st->quality = get_be32(pb);
|
2002-05-09 12:37:44 +00:00
|
|
|
codec->flags = get_be32(pb);
|
2005-05-06 03:19:45 +00:00
|
|
|
codec->flags2 = get_be32(pb);
|
|
|
|
codec->debug = get_be32(pb);
|
2001-07-22 14:18:56 +00:00
|
|
|
/* specific info */
|
|
|
|
switch(codec->codec_type) {
|
|
|
|
case CODEC_TYPE_VIDEO:
|
2005-04-30 21:43:59 +00:00
|
|
|
codec->time_base.num = get_be32(pb);
|
|
|
|
codec->time_base.den = get_be32(pb);
|
2001-07-22 14:18:56 +00:00
|
|
|
codec->width = get_be16(pb);
|
|
|
|
codec->height = get_be16(pb);
|
2002-05-09 01:18:08 +00:00
|
|
|
codec->gop_size = get_be16(pb);
|
2005-05-06 03:19:45 +00:00
|
|
|
codec->pix_fmt = get_be32(pb);
|
2002-05-09 01:18:08 +00:00
|
|
|
codec->qmin = get_byte(pb);
|
|
|
|
codec->qmax = get_byte(pb);
|
|
|
|
codec->max_qdiff = get_byte(pb);
|
|
|
|
codec->qcompress = get_be16(pb) / 10000.0;
|
|
|
|
codec->qblur = get_be16(pb) / 10000.0;
|
2002-05-16 01:57:55 +00:00
|
|
|
codec->bit_rate_tolerance = get_be32(pb);
|
2003-01-23 23:34:29 +00:00
|
|
|
codec->rc_eq = av_strdup(get_strz(pb, rc_eq_buf, sizeof(rc_eq_buf)));
|
2002-09-12 02:26:58 +00:00
|
|
|
codec->rc_max_rate = get_be32(pb);
|
|
|
|
codec->rc_min_rate = get_be32(pb);
|
|
|
|
codec->rc_buffer_size = get_be32(pb);
|
2005-07-19 14:50:22 +00:00
|
|
|
codec->i_quant_factor = av_int2dbl(get_be64(pb));
|
|
|
|
codec->b_quant_factor = av_int2dbl(get_be64(pb));
|
|
|
|
codec->i_quant_offset = av_int2dbl(get_be64(pb));
|
|
|
|
codec->b_quant_offset = av_int2dbl(get_be64(pb));
|
2002-09-12 02:26:58 +00:00
|
|
|
codec->dct_algo = get_be32(pb);
|
2005-05-06 03:19:45 +00:00
|
|
|
codec->strict_std_compliance = get_be32(pb);
|
|
|
|
codec->max_b_frames = get_be32(pb);
|
|
|
|
codec->luma_elim_threshold = get_be32(pb);
|
|
|
|
codec->chroma_elim_threshold = get_be32(pb);
|
|
|
|
codec->mpeg_quant = get_be32(pb);
|
|
|
|
codec->intra_dc_precision = get_be32(pb);
|
|
|
|
codec->me_method = get_be32(pb);
|
|
|
|
codec->mb_decision = get_be32(pb);
|
|
|
|
codec->nsse_weight = get_be32(pb);
|
|
|
|
codec->frame_skip_cmp = get_be32(pb);
|
2005-07-19 14:50:22 +00:00
|
|
|
codec->rc_buffer_aggressivity = av_int2dbl(get_be64(pb));
|
2007-02-22 13:23:38 +00:00
|
|
|
codec->codec_tag = get_be32(pb);
|
2001-07-22 14:18:56 +00:00
|
|
|
break;
|
|
|
|
case CODEC_TYPE_AUDIO:
|
|
|
|
codec->sample_rate = get_be32(pb);
|
|
|
|
codec->channels = get_le16(pb);
|
2002-05-09 01:18:08 +00:00
|
|
|
codec->frame_size = get_le16(pb);
|
2001-07-22 14:18:56 +00:00
|
|
|
break;
|
2002-05-09 01:18:08 +00:00
|
|
|
default:
|
2002-09-12 02:26:58 +00:00
|
|
|
goto fail;
|
2001-07-22 14:18:56 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
/* get until end of block reached */
|
|
|
|
while ((url_ftell(pb) % ffm->packet_size) != 0)
|
|
|
|
get_byte(pb);
|
|
|
|
|
|
|
|
/* init packet demux */
|
|
|
|
ffm->packet_ptr = ffm->packet;
|
|
|
|
ffm->packet_end = ffm->packet;
|
|
|
|
ffm->frame_offset = 0;
|
|
|
|
ffm->pts = 0;
|
|
|
|
ffm->read_state = READ_HEADER;
|
|
|
|
ffm->first_packet = 1;
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
|
|
for(i=0;i<s->nb_streams;i++) {
|
|
|
|
st = s->streams[i];
|
|
|
|
if (st) {
|
2002-05-24 01:19:27 +00:00
|
|
|
av_freep(&st->priv_data);
|
2002-05-18 23:11:09 +00:00
|
|
|
av_free(st);
|
2001-07-22 14:18:56 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* return < 0 if eof */
|
|
|
|
static int ffm_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
|
|
{
|
|
|
|
int size;
|
|
|
|
FFMContext *ffm = s->priv_data;
|
2002-05-09 01:18:08 +00:00
|
|
|
int duration;
|
2001-07-22 14:18:56 +00:00
|
|
|
|
|
|
|
switch(ffm->read_state) {
|
|
|
|
case READ_HEADER:
|
2002-05-25 22:31:48 +00:00
|
|
|
if (!ffm_is_avail_data(s, FRAME_HEADER_SIZE)) {
|
2007-02-13 18:26:14 +00:00
|
|
|
return AVERROR(EAGAIN);
|
2002-05-25 22:31:48 +00:00
|
|
|
}
|
2008-05-26 04:34:29 +00:00
|
|
|
dprintf(s, "pos=%08"PRIx64" spos=%"PRIx64", write_index=%"PRIx64" size=%"PRIx64"\n",
|
2007-11-21 07:41:00 +00:00
|
|
|
url_ftell(s->pb), s->pb.pos, ffm->write_index, ffm->file_size);
|
2005-12-17 18:14:38 +00:00
|
|
|
if (ffm_read_data(s, ffm->header, FRAME_HEADER_SIZE, 1) !=
|
2002-05-25 22:31:48 +00:00
|
|
|
FRAME_HEADER_SIZE)
|
2007-02-13 18:26:14 +00:00
|
|
|
return AVERROR(EAGAIN);
|
2001-07-22 14:18:56 +00:00
|
|
|
#if 0
|
2008-05-26 04:38:46 +00:00
|
|
|
av_hexdump_log(s, AV_LOG_DEBUG, ffm->header, FRAME_HEADER_SIZE);
|
2001-07-22 14:18:56 +00:00
|
|
|
#endif
|
|
|
|
ffm->read_state = READ_DATA;
|
|
|
|
/* fall thru */
|
|
|
|
case READ_DATA:
|
2007-07-06 09:32:34 +00:00
|
|
|
size = AV_RB24(ffm->header + 2);
|
2001-07-22 14:18:56 +00:00
|
|
|
if (!ffm_is_avail_data(s, size)) {
|
2007-02-13 18:26:14 +00:00
|
|
|
return AVERROR(EAGAIN);
|
2001-07-22 14:18:56 +00:00
|
|
|
}
|
|
|
|
|
2007-07-06 09:32:34 +00:00
|
|
|
duration = AV_RB24(ffm->header + 5);
|
2002-05-09 01:18:08 +00:00
|
|
|
|
2001-07-22 14:18:56 +00:00
|
|
|
av_new_packet(pkt, size);
|
|
|
|
pkt->stream_index = ffm->header[0];
|
2008-05-21 21:04:42 +00:00
|
|
|
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;
|
|
|
|
return AVERROR(EAGAIN);
|
|
|
|
}
|
2007-11-21 07:41:00 +00:00
|
|
|
pkt->pos = url_ftell(s->pb);
|
2001-07-22 14:18:56 +00:00
|
|
|
if (ffm->header[1] & FLAG_KEY_FRAME)
|
|
|
|
pkt->flags |= PKT_FLAG_KEY;
|
2002-04-08 20:58:56 +00:00
|
|
|
|
2001-07-22 14:18:56 +00:00
|
|
|
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);
|
2007-02-13 18:26:14 +00:00
|
|
|
return AVERROR(EAGAIN);
|
2001-07-22 14:18:56 +00:00
|
|
|
}
|
2006-01-19 00:54:10 +00:00
|
|
|
if (ffm->first_frame_in_packet)
|
|
|
|
{
|
|
|
|
pkt->pts = ffm->pts;
|
|
|
|
ffm->first_frame_in_packet = 0;
|
|
|
|
}
|
2002-05-09 01:18:08 +00:00
|
|
|
pkt->duration = duration;
|
2001-07-22 14:18:56 +00:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* seek to a given time in the file. The file read pointer is
|
2008-01-08 23:08:51 +00:00
|
|
|
positioned at or before pts. XXX: the following code is quite
|
2001-07-22 14:18:56 +00:00
|
|
|
approximative */
|
2004-10-11 23:53:53 +00:00
|
|
|
static int ffm_seek(AVFormatContext *s, int stream_index, int64_t wanted_pts, int flags)
|
2001-07-22 14:18:56 +00:00
|
|
|
{
|
|
|
|
FFMContext *ffm = s->priv_data;
|
|
|
|
offset_t pos_min, pos_max, pos;
|
2003-02-11 16:35:48 +00:00
|
|
|
int64_t pts_min, pts_max, pts;
|
2001-07-22 14:18:56 +00:00
|
|
|
double pos1;
|
|
|
|
|
|
|
|
#ifdef DEBUG_SEEK
|
2008-05-26 04:40:22 +00:00
|
|
|
av_log(s, AV_LOG_DEBUG, "wanted_pts=%0.6f\n", wanted_pts / 1000000.0);
|
2001-07-22 14:18:56 +00:00
|
|
|
#endif
|
|
|
|
/* find the position using linear interpolation (better than
|
|
|
|
dichotomy in typical cases) */
|
|
|
|
pos_min = 0;
|
|
|
|
pos_max = ffm->file_size - 2 * FFM_PACKET_SIZE;
|
|
|
|
while (pos_min <= pos_max) {
|
|
|
|
pts_min = get_pts(s, pos_min);
|
|
|
|
pts_max = get_pts(s, pos_max);
|
|
|
|
/* linear interpolation */
|
2002-04-08 20:58:56 +00:00
|
|
|
pos1 = (double)(pos_max - pos_min) * (double)(wanted_pts - pts_min) /
|
2001-07-22 14:18:56 +00:00
|
|
|
(double)(pts_max - pts_min);
|
2003-02-11 16:35:48 +00:00
|
|
|
pos = (((int64_t)pos1) / FFM_PACKET_SIZE) * FFM_PACKET_SIZE;
|
2001-07-22 14:18:56 +00:00
|
|
|
if (pos <= pos_min)
|
|
|
|
pos = pos_min;
|
|
|
|
else if (pos >= pos_max)
|
|
|
|
pos = pos_max;
|
|
|
|
pts = get_pts(s, pos);
|
|
|
|
/* 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;
|
|
|
|
}
|
|
|
|
}
|
2004-10-11 23:53:53 +00:00
|
|
|
pos = (flags & AVSEEK_FLAG_BACKWARD) ? pos_min : pos_max;
|
2001-07-22 14:18:56 +00:00
|
|
|
if (pos > 0)
|
|
|
|
pos -= FFM_PACKET_SIZE;
|
|
|
|
found:
|
|
|
|
ffm_seek1(s, pos);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int ffm_read_close(AVFormatContext *s)
|
|
|
|
{
|
|
|
|
AVStream *st;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
for(i=0;i<s->nb_streams;i++) {
|
|
|
|
st = s->streams[i];
|
2002-05-24 01:19:27 +00:00
|
|
|
av_freep(&st->priv_data);
|
2001-07-22 14:18:56 +00:00
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2002-05-24 02:06:51 +00:00
|
|
|
static int ffm_probe(AVProbeData *p)
|
|
|
|
{
|
2007-04-08 11:34:15 +00:00
|
|
|
if (
|
2005-12-17 18:14:38 +00:00
|
|
|
p->buf[0] == 'F' && p->buf[1] == 'F' && p->buf[2] == 'M' &&
|
2002-05-25 22:31:48 +00:00
|
|
|
p->buf[3] == '1')
|
2002-05-24 02:06:51 +00:00
|
|
|
return AVPROBE_SCORE_MAX + 1;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2006-07-10 21:14:37 +00:00
|
|
|
AVInputFormat ffm_demuxer = {
|
2002-05-20 16:31:13 +00:00
|
|
|
"ffm",
|
|
|
|
"ffm format",
|
2002-05-25 22:31:48 +00:00
|
|
|
sizeof(FFMContext),
|
2002-05-24 02:06:51 +00:00
|
|
|
ffm_probe,
|
2002-05-20 16:31:13 +00:00
|
|
|
ffm_read_header,
|
|
|
|
ffm_read_packet,
|
|
|
|
ffm_read_close,
|
|
|
|
ffm_seek,
|
|
|
|
};
|