mirror of
https://git.ffmpeg.org/ffmpeg.git
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879 lines
30 KiB
C
879 lines
30 KiB
C
/*
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* FFM (ffserver live feed) demuxer
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* Copyright (c) 2001 Fabrice Bellard
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*
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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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* 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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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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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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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdint.h>
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#include "libavutil/imgutils.h"
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#include "libavutil/internal.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/intfloat.h"
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#include "libavutil/opt.h"
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#include "libavutil/avassert.h"
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#include "libavutil/avstring.h"
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#include "libavutil/pixdesc.h"
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#include "libavcodec/internal.h"
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#include "avformat.h"
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#include "internal.h"
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#include "ffm.h"
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#include "avio_internal.h"
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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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int64_t pos, avail_size;
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ptrdiff_t len;
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len = ffm->packet_end - ffm->packet_ptr;
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if (size <= len)
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return 1;
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pos = avio_tell(s->pb);
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if (!ffm->write_index) {
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if (pos == ffm->file_size)
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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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if (pos == ffm->write_index) {
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/* exactly at the end of stream */
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if (ffm->server_attached)
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return AVERROR(EAGAIN);
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else
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return AVERROR_INVALIDDATA;
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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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}
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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 if (ffm->server_attached)
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return AVERROR(EAGAIN);
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else
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return AVERROR_INVALIDDATA;
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}
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static int ffm_resync(AVFormatContext *s, uint32_t 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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if (avio_feof(s->pb)) {
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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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state = (state << 8) | avio_r8(s->pb);
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}
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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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static int ffm_read_data(AVFormatContext *s,
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uint8_t *buf, int size, int header)
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{
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FFMContext *ffm = s->priv_data;
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AVIOContext *pb = s->pb;
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int fill_size, size1, frame_offset;
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uint32_t id;
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ptrdiff_t len;
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int64_t last_pos = -1;
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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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if (len < 0)
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return -1;
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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 (avio_tell(pb) == ffm->file_size) {
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if (ffm->server_attached) {
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avio_seek(pb, ffm->packet_size, SEEK_SET);
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} else
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return AVERROR_EOF;
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}
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retry_read:
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if (pb->buffer_size != ffm->packet_size) {
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int64_t tell = avio_tell(pb);
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int ret = ffio_set_buf_size(pb, ffm->packet_size);
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if (ret < 0)
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return ret;
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avio_seek(pb, tell, SEEK_SET);
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}
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id = avio_rb16(pb); /* PACKET_ID */
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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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last_pos = avio_tell(pb);
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}
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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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if (ffm->packet_size < FFM_HEADER_SIZE + fill_size || frame_offset < 0) {
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return -1;
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}
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ffm->packet_end = ffm->packet + (ffm->packet_size - FFM_HEADER_SIZE - fill_size);
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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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if (!frame_offset) {
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/* This packet has no frame headers in it */
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if (avio_tell(pb) >= ffm->packet_size * 3LL) {
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int64_t seekback = FFMIN(ffm->packet_size * 2LL, avio_tell(pb) - last_pos);
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seekback = FFMAX(seekback, 0);
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avio_seek(pb, -seekback, 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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ffm->first_packet = 0;
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if ((frame_offset & 0x7fff) < FFM_HEADER_SIZE) {
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ffm->packet_end = ffm->packet_ptr;
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return -1;
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}
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ffm->packet_ptr = ffm->packet + (frame_offset & 0x7fff) - FFM_HEADER_SIZE;
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if (!header)
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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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header = 0;
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}
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return size1 - size;
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}
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/* ensure that actual seeking happens between FFM_PACKET_SIZE
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and file_size - FFM_PACKET_SIZE */
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static int64_t ffm_seek1(AVFormatContext *s, int64_t pos1)
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{
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FFMContext *ffm = s->priv_data;
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AVIOContext *pb = s->pb;
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int64_t pos;
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pos = FFMIN(pos1, ffm->file_size - FFM_PACKET_SIZE);
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pos = FFMAX(pos, FFM_PACKET_SIZE);
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ff_dlog(s, "seek to %"PRIx64" -> %"PRIx64"\n", pos1, pos);
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return avio_seek(pb, pos, SEEK_SET);
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}
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static int64_t get_dts(AVFormatContext *s, int64_t pos)
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{
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AVIOContext *pb = s->pb;
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int64_t dts;
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ffm_seek1(s, pos);
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avio_skip(pb, 4);
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dts = avio_rb64(pb);
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ff_dlog(s, "dts=%0.6f\n", dts / 1000000.0);
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return dts;
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}
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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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AVIOContext *pb = s->pb;
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int64_t pts;
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//int64_t orig_write_index = ffm->write_index;
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int64_t pos_min, pos_max;
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int64_t pts_start;
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int64_t ptr = avio_tell(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_dts(s, pos_min);
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pts = get_dts(s, pos_max);
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if (pts - 100000 > pts_start)
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goto end;
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ffm->write_index = FFM_PACKET_SIZE;
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pts_start = get_dts(s, pos_min);
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pts = get_dts(s, pos_max);
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if (pts - 100000 <= pts_start) {
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while (1) {
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int64_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_dts(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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end:
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avio_seek(pb, ptr, SEEK_SET);
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}
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static int ffm_append_recommended_configuration(AVStream *st, char **conf)
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{
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int ret;
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size_t newsize;
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av_assert0(conf && st);
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if (!*conf)
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return 0;
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if (!st->recommended_encoder_configuration) {
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st->recommended_encoder_configuration = *conf;
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*conf = 0;
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return 0;
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}
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newsize = strlen(*conf) + strlen(st->recommended_encoder_configuration) + 2;
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if ((ret = av_reallocp(&st->recommended_encoder_configuration, newsize)) < 0)
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return ret;
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av_strlcat(st->recommended_encoder_configuration, ",", newsize);
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av_strlcat(st->recommended_encoder_configuration, *conf, newsize);
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av_freep(conf);
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return 0;
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}
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#define VALIDATE_PARAMETER(parameter, name, check) { \
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if (check) { \
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av_log(s, AV_LOG_ERROR, "Invalid " name " %d\n", codecpar->parameter); \
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ret = AVERROR_INVALIDDATA; \
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goto fail; \
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} \
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}
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static int ffm2_read_header(AVFormatContext *s)
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{
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FFMContext *ffm = s->priv_data;
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AVStream *st = NULL;
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AVIOContext *pb = s->pb;
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AVCodecContext *dummy_codec = NULL;
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AVCodecParameters *codecpar = NULL;
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const AVCodecDescriptor *codec_desc;
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int ret;
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int f_main = 0, f_cprv = -1, f_stvi = -1, f_stau = -1;
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AVCodec *enc;
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char *buffer;
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ffm->packet_size = avio_rb32(pb);
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if (ffm->packet_size != FFM_PACKET_SIZE) {
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av_log(s, AV_LOG_ERROR, "Invalid packet size %d, expected size was %d\n",
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ffm->packet_size, FFM_PACKET_SIZE);
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ret = AVERROR_INVALIDDATA;
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goto fail;
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}
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ffm->write_index = avio_rb64(pb);
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/* get also filesize */
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if (pb->seekable) {
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ffm->file_size = avio_size(pb);
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if (ffm->write_index && 0)
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adjust_write_index(s);
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} else {
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ffm->file_size = (UINT64_C(1) << 63) - 1;
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}
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dummy_codec = avcodec_alloc_context3(NULL);
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while(!avio_feof(pb)) {
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unsigned id = avio_rb32(pb);
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unsigned size = avio_rb32(pb);
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int64_t next = avio_tell(pb) + size;
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char rc_eq_buf[128];
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int flags;
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if(!id)
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break;
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switch(id) {
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case MKBETAG('M', 'A', 'I', 'N'):
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if (f_main++) {
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ret = AVERROR(EINVAL);
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goto fail;
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}
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avio_rb32(pb); /* nb_streams */
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avio_rb32(pb); /* total bitrate */
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break;
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case MKBETAG('C', 'O', 'M', 'M'):
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f_cprv = f_stvi = f_stau = 0;
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st = avformat_new_stream(s, NULL);
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if (!st) {
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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avpriv_set_pts_info(st, 64, 1, 1000000);
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codecpar = st->codecpar;
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/* generic info */
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codecpar->codec_id = avio_rb32(pb);
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codec_desc = avcodec_descriptor_get(codecpar->codec_id);
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if (!codec_desc) {
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av_log(s, AV_LOG_ERROR, "Invalid codec id: %d\n", codecpar->codec_id);
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codecpar->codec_id = AV_CODEC_ID_NONE;
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ret = AVERROR_INVALIDDATA;
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goto fail;
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}
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codecpar->codec_type = avio_r8(pb);
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if (codecpar->codec_type != codec_desc->type) {
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av_log(s, AV_LOG_ERROR, "Codec type mismatch: expected %d, found %d\n",
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codec_desc->type, codecpar->codec_type);
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codecpar->codec_id = AV_CODEC_ID_NONE;
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codecpar->codec_type = AVMEDIA_TYPE_UNKNOWN;
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ret = AVERROR_INVALIDDATA;
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goto fail;
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}
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codecpar->bit_rate = avio_rb32(pb);
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if (codecpar->bit_rate < 0) {
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av_log(s, AV_LOG_ERROR, "Invalid bit rate %"PRId64"\n", codecpar->bit_rate);
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ret = AVERROR_INVALIDDATA;
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goto fail;
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}
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flags = avio_rb32(pb);
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#if FF_API_LAVF_AVCTX
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FF_DISABLE_DEPRECATION_WARNINGS
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st->codec->flags = flags;
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FF_ENABLE_DEPRECATION_WARNINGS
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#endif
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avio_rb32(pb); // flags2
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avio_rb32(pb); // debug
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if (flags & AV_CODEC_FLAG_GLOBAL_HEADER) {
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int size = avio_rb32(pb);
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if (size < 0 || size >= FF_MAX_EXTRADATA_SIZE) {
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av_log(s, AV_LOG_ERROR, "Invalid extradata size %d\n", size);
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ret = AVERROR_INVALIDDATA;
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goto fail;
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}
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codecpar->extradata = av_mallocz(size + AV_INPUT_BUFFER_PADDING_SIZE);
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if (!codecpar->extradata) {
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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codecpar->extradata_size = size;
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avio_read(pb, codecpar->extradata, size);
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}
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break;
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case MKBETAG('S', 'T', 'V', 'I'):
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if (f_stvi++ || codecpar->codec_type != AVMEDIA_TYPE_VIDEO) {
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ret = AVERROR(EINVAL);
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goto fail;
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}
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avio_rb32(pb); // time_base.num
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avio_rb32(pb); // time_base.den
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codecpar->width = avio_rb16(pb);
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codecpar->height = avio_rb16(pb);
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ret = av_image_check_size(codecpar->width, codecpar->height, 0, s);
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if (ret < 0)
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goto fail;
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avio_rb16(pb); // gop_size
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codecpar->format = avio_rb32(pb);
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if (!av_pix_fmt_desc_get(codecpar->format)) {
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av_log(s, AV_LOG_ERROR, "Invalid pix fmt id: %d\n", codecpar->format);
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codecpar->format = AV_PIX_FMT_NONE;
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ret = AVERROR_INVALIDDATA;
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goto fail;
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}
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avio_r8(pb); // qmin
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avio_r8(pb); // qmax
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avio_r8(pb); // max_qdiff
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avio_rb16(pb); // qcompress / 10000.0
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avio_rb16(pb); // qblur / 10000.0
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avio_rb32(pb); // bit_rate_tolerance
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avio_get_str(pb, INT_MAX, rc_eq_buf, sizeof(rc_eq_buf));
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avio_rb32(pb); // rc_max_rate
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avio_rb32(pb); // rc_min_rate
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avio_rb32(pb); // rc_buffer_size
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avio_rb64(pb); // i_quant_factor
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avio_rb64(pb); // b_quant_factor
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avio_rb64(pb); // i_quant_offset
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avio_rb64(pb); // b_quant_offset
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avio_rb32(pb); // dct_algo
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avio_rb32(pb); // strict_std_compliance
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avio_rb32(pb); // max_b_frames
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avio_rb32(pb); // mpeg_quant
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avio_rb32(pb); // intra_dc_precision
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avio_rb32(pb); // me_method
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avio_rb32(pb); // mb_decision
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avio_rb32(pb); // nsse_weight
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avio_rb32(pb); // frame_skip_cmp
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avio_rb64(pb); // rc_buffer_aggressivity
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codecpar->codec_tag = avio_rb32(pb);
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avio_r8(pb); // thread_count
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avio_rb32(pb); // coder_type
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avio_rb32(pb); // me_cmp
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avio_rb32(pb); // me_subpel_quality
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avio_rb32(pb); // me_range
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avio_rb32(pb); // keyint_min
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avio_rb32(pb); // scenechange_threshold
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avio_rb32(pb); // b_frame_strategy
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avio_rb64(pb); // qcompress
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avio_rb64(pb); // qblur
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avio_rb32(pb); // max_qdiff
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avio_rb32(pb); // refs
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break;
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case MKBETAG('S', 'T', 'A', 'U'):
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if (f_stau++ || codecpar->codec_type != AVMEDIA_TYPE_AUDIO) {
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ret = AVERROR(EINVAL);
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goto fail;
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}
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codecpar->sample_rate = avio_rb32(pb);
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VALIDATE_PARAMETER(sample_rate, "sample rate", codecpar->sample_rate < 0)
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codecpar->channels = avio_rl16(pb);
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VALIDATE_PARAMETER(channels, "number of channels", codecpar->channels < 0)
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codecpar->frame_size = avio_rl16(pb);
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VALIDATE_PARAMETER(frame_size, "frame size", codecpar->frame_size < 0)
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break;
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case MKBETAG('C', 'P', 'R', 'V'):
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if (f_cprv++) {
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ret = AVERROR(EINVAL);
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goto fail;
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}
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enc = avcodec_find_encoder(codecpar->codec_id);
|
|
if (enc && enc->priv_data_size && enc->priv_class) {
|
|
buffer = av_malloc(size + 1);
|
|
if (!buffer) {
|
|
ret = AVERROR(ENOMEM);
|
|
goto fail;
|
|
}
|
|
avio_get_str(pb, size, buffer, size + 1);
|
|
if ((ret = ffm_append_recommended_configuration(st, &buffer)) < 0)
|
|
goto fail;
|
|
}
|
|
break;
|
|
case MKBETAG('S', '2', 'V', 'I'):
|
|
if (f_stvi++ || !size || codecpar->codec_type != AVMEDIA_TYPE_VIDEO) {
|
|
ret = AVERROR(EINVAL);
|
|
goto fail;
|
|
}
|
|
buffer = av_malloc(size);
|
|
if (!buffer) {
|
|
ret = AVERROR(ENOMEM);
|
|
goto fail;
|
|
}
|
|
avio_get_str(pb, INT_MAX, buffer, size);
|
|
// The lack of AVOptions support in AVCodecParameters makes this back and forth copying needed
|
|
avcodec_parameters_to_context(dummy_codec, codecpar);
|
|
av_set_options_string(dummy_codec, buffer, "=", ",");
|
|
avcodec_parameters_from_context(codecpar, dummy_codec);
|
|
if ((ret = ffm_append_recommended_configuration(st, &buffer)) < 0)
|
|
goto fail;
|
|
break;
|
|
case MKBETAG('S', '2', 'A', 'U'):
|
|
if (f_stau++ || !size || codecpar->codec_type != AVMEDIA_TYPE_AUDIO) {
|
|
ret = AVERROR(EINVAL);
|
|
goto fail;
|
|
}
|
|
buffer = av_malloc(size);
|
|
if (!buffer) {
|
|
ret = AVERROR(ENOMEM);
|
|
goto fail;
|
|
}
|
|
avio_get_str(pb, INT_MAX, buffer, size);
|
|
// The lack of AVOptions support in AVCodecParameters makes this back and forth copying needed
|
|
avcodec_parameters_to_context(dummy_codec, codecpar);
|
|
av_set_options_string(dummy_codec, buffer, "=", ",");
|
|
avcodec_parameters_from_context(codecpar, dummy_codec);
|
|
if ((ret = ffm_append_recommended_configuration(st, &buffer)) < 0)
|
|
goto fail;
|
|
break;
|
|
}
|
|
avio_seek(pb, next, SEEK_SET);
|
|
}
|
|
|
|
/* get until end of block reached */
|
|
while ((avio_tell(pb) % ffm->packet_size) != 0 && !pb->eof_reached)
|
|
avio_r8(pb);
|
|
|
|
/* init packet demux */
|
|
ffm->packet_ptr = ffm->packet;
|
|
ffm->packet_end = ffm->packet;
|
|
ffm->frame_offset = 0;
|
|
ffm->dts = 0;
|
|
ffm->read_state = READ_HEADER;
|
|
ffm->first_packet = 1;
|
|
avcodec_free_context(&dummy_codec);
|
|
return 0;
|
|
fail:
|
|
avcodec_free_context(&dummy_codec);
|
|
return ret;
|
|
}
|
|
|
|
static int ffm_read_header(AVFormatContext *s)
|
|
{
|
|
FFMContext *ffm = s->priv_data;
|
|
AVStream *st;
|
|
AVIOContext *pb = s->pb;
|
|
AVCodecContext *dummy_codec = NULL;
|
|
AVCodecParameters *codecpar;
|
|
const AVCodecDescriptor *codec_desc;
|
|
int i, nb_streams, ret;
|
|
uint32_t tag;
|
|
|
|
/* header */
|
|
tag = avio_rl32(pb);
|
|
if (tag == MKTAG('F', 'F', 'M', '2'))
|
|
return ffm2_read_header(s);
|
|
if (tag != MKTAG('F', 'F', 'M', '1')) {
|
|
ret = AVERROR_INVALIDDATA;
|
|
goto fail;
|
|
}
|
|
ffm->packet_size = avio_rb32(pb);
|
|
if (ffm->packet_size != FFM_PACKET_SIZE) {
|
|
ret = AVERROR_INVALIDDATA;
|
|
goto fail;
|
|
}
|
|
ffm->write_index = avio_rb64(pb);
|
|
/* get also filesize */
|
|
if (pb->seekable) {
|
|
ffm->file_size = avio_size(pb);
|
|
if (ffm->write_index && 0)
|
|
adjust_write_index(s);
|
|
} else {
|
|
ffm->file_size = (UINT64_C(1) << 63) - 1;
|
|
}
|
|
dummy_codec = avcodec_alloc_context3(NULL);
|
|
|
|
nb_streams = avio_rb32(pb);
|
|
avio_rb32(pb); /* total bitrate */
|
|
/* read each stream */
|
|
for(i=0;i<nb_streams;i++) {
|
|
char rc_eq_buf[128];
|
|
int flags;
|
|
|
|
st = avformat_new_stream(s, NULL);
|
|
if (!st) {
|
|
ret = AVERROR(ENOMEM);
|
|
goto fail;
|
|
}
|
|
|
|
avpriv_set_pts_info(st, 64, 1, 1000000);
|
|
|
|
codecpar = st->codecpar;
|
|
/* generic info */
|
|
codecpar->codec_id = avio_rb32(pb);
|
|
codec_desc = avcodec_descriptor_get(codecpar->codec_id);
|
|
if (!codec_desc) {
|
|
av_log(s, AV_LOG_ERROR, "Invalid codec id: %d\n", codecpar->codec_id);
|
|
codecpar->codec_id = AV_CODEC_ID_NONE;
|
|
ret = AVERROR_INVALIDDATA;
|
|
goto fail;
|
|
}
|
|
codecpar->codec_type = avio_r8(pb); /* codec_type */
|
|
if (codecpar->codec_type != codec_desc->type) {
|
|
av_log(s, AV_LOG_ERROR, "Codec type mismatch: expected %d, found %d\n",
|
|
codec_desc->type, codecpar->codec_type);
|
|
codecpar->codec_id = AV_CODEC_ID_NONE;
|
|
codecpar->codec_type = AVMEDIA_TYPE_UNKNOWN;
|
|
ret = AVERROR_INVALIDDATA;
|
|
goto fail;
|
|
}
|
|
codecpar->bit_rate = avio_rb32(pb);
|
|
if (codecpar->bit_rate < 0) {
|
|
av_log(s, AV_LOG_WARNING, "Invalid bit rate %"PRId64"\n", codecpar->bit_rate);
|
|
ret = AVERROR_INVALIDDATA;
|
|
goto fail;
|
|
}
|
|
flags = avio_rb32(pb);
|
|
#if FF_API_LAVF_AVCTX
|
|
FF_DISABLE_DEPRECATION_WARNINGS
|
|
st->codec->flags = flags;
|
|
FF_ENABLE_DEPRECATION_WARNINGS
|
|
#endif
|
|
avio_rb32(pb); // flags2
|
|
avio_rb32(pb); // debug
|
|
/* specific info */
|
|
switch(codecpar->codec_type) {
|
|
case AVMEDIA_TYPE_VIDEO:
|
|
avio_rb32(pb); // time_base.num
|
|
avio_rb32(pb); // time_base.den
|
|
codecpar->width = avio_rb16(pb);
|
|
codecpar->height = avio_rb16(pb);
|
|
if ((ret = av_image_check_size(codecpar->width, codecpar->height, 0, s)) < 0)
|
|
goto fail;
|
|
avio_rb16(pb); // gop_size
|
|
codecpar->format = avio_rb32(pb);
|
|
if (!av_pix_fmt_desc_get(codecpar->format)) {
|
|
av_log(s, AV_LOG_ERROR, "Invalid pix fmt id: %d\n", codecpar->format);
|
|
codecpar->format = AV_PIX_FMT_NONE;
|
|
ret = AVERROR_INVALIDDATA;
|
|
goto fail;
|
|
}
|
|
avio_r8(pb); // qmin
|
|
avio_r8(pb); // qmax
|
|
avio_r8(pb); // max_qdiff
|
|
avio_rb16(pb); // qcompress / 10000.0
|
|
avio_rb16(pb); // qblur / 10000.0
|
|
avio_rb32(pb); // bit_rate_tolerance
|
|
avio_get_str(pb, INT_MAX, rc_eq_buf, sizeof(rc_eq_buf));
|
|
|
|
avio_rb32(pb); // rc_max_rate
|
|
avio_rb32(pb); // rc_min_rate
|
|
avio_rb32(pb); // rc_buffer_size
|
|
avio_rb64(pb); // i_quant_factor
|
|
avio_rb64(pb); // b_quant_factor
|
|
avio_rb64(pb); // i_quant_offset
|
|
avio_rb64(pb); // b_quant_offset
|
|
avio_rb32(pb); // dct_algo
|
|
avio_rb32(pb); // strict_std_compliance
|
|
avio_rb32(pb); // max_b_frames
|
|
avio_rb32(pb); // mpeg_quant
|
|
avio_rb32(pb); // intra_dc_precision
|
|
avio_rb32(pb); // me_method
|
|
avio_rb32(pb); // mb_decision
|
|
avio_rb32(pb); // nsse_weight
|
|
avio_rb32(pb); // frame_skip_cmp
|
|
avio_rb64(pb); // rc_buffer_aggressivity
|
|
codecpar->codec_tag = avio_rb32(pb);
|
|
avio_r8(pb); // thread_count
|
|
avio_rb32(pb); // coder_type
|
|
avio_rb32(pb); // me_cmp
|
|
avio_rb32(pb); // me_subpel_quality
|
|
avio_rb32(pb); // me_range
|
|
avio_rb32(pb); // keyint_min
|
|
avio_rb32(pb); // scenechange_threshold
|
|
avio_rb32(pb); // b_frame_strategy
|
|
avio_rb64(pb); // qcompress
|
|
avio_rb64(pb); // qblur
|
|
avio_rb32(pb); // max_qdiff
|
|
avio_rb32(pb); // refs
|
|
break;
|
|
case AVMEDIA_TYPE_AUDIO:
|
|
codecpar->sample_rate = avio_rb32(pb);
|
|
VALIDATE_PARAMETER(sample_rate, "sample rate", codecpar->sample_rate < 0)
|
|
codecpar->channels = avio_rl16(pb);
|
|
VALIDATE_PARAMETER(channels, "number of channels", codecpar->channels < 0)
|
|
codecpar->frame_size = avio_rl16(pb);
|
|
VALIDATE_PARAMETER(frame_size, "frame size", codecpar->frame_size < 0)
|
|
break;
|
|
default:
|
|
ret = AVERROR_INVALIDDATA;
|
|
goto fail;
|
|
}
|
|
if (flags & AV_CODEC_FLAG_GLOBAL_HEADER) {
|
|
int size = avio_rb32(pb);
|
|
if (size < 0 || size >= FF_MAX_EXTRADATA_SIZE) {
|
|
av_log(s, AV_LOG_ERROR, "Invalid extradata size %d\n", size);
|
|
ret = AVERROR_INVALIDDATA;
|
|
goto fail;
|
|
}
|
|
codecpar->extradata = av_mallocz(size + AV_INPUT_BUFFER_PADDING_SIZE);
|
|
if (!codecpar->extradata) {
|
|
ret = AVERROR(ENOMEM);
|
|
goto fail;
|
|
}
|
|
codecpar->extradata_size = size;
|
|
avio_read(pb, codecpar->extradata, size);
|
|
}
|
|
}
|
|
|
|
/* get until end of block reached */
|
|
while ((avio_tell(pb) % ffm->packet_size) != 0 && !pb->eof_reached)
|
|
avio_r8(pb);
|
|
|
|
/* init packet demux */
|
|
ffm->packet_ptr = ffm->packet;
|
|
ffm->packet_end = ffm->packet;
|
|
ffm->frame_offset = 0;
|
|
ffm->dts = 0;
|
|
ffm->read_state = READ_HEADER;
|
|
ffm->first_packet = 1;
|
|
avcodec_free_context(&dummy_codec);
|
|
return 0;
|
|
fail:
|
|
avcodec_free_context(&dummy_codec);
|
|
return ret;
|
|
}
|
|
|
|
/* return < 0 if eof */
|
|
static int ffm_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
int size;
|
|
FFMContext *ffm = s->priv_data;
|
|
int duration, ret;
|
|
|
|
switch(ffm->read_state) {
|
|
case READ_HEADER:
|
|
if ((ret = ffm_is_avail_data(s, FRAME_HEADER_SIZE+4)) < 0)
|
|
return ret;
|
|
|
|
ff_dlog(s, "pos=%08"PRIx64" spos=%"PRIx64", write_index=%"PRIx64" size=%"PRIx64"\n",
|
|
avio_tell(s->pb), s->pb->pos, ffm->write_index, ffm->file_size);
|
|
if (ffm_read_data(s, ffm->header, FRAME_HEADER_SIZE, 1) !=
|
|
FRAME_HEADER_SIZE)
|
|
return -1;
|
|
if (ffm->header[1] & FLAG_DTS)
|
|
if (ffm_read_data(s, ffm->header+16, 4, 1) != 4)
|
|
return -1;
|
|
ffm->read_state = READ_DATA;
|
|
/* fall through */
|
|
case READ_DATA:
|
|
size = AV_RB24(ffm->header + 2);
|
|
if ((ret = ffm_is_avail_data(s, size)) < 0)
|
|
return ret;
|
|
|
|
duration = AV_RB24(ffm->header + 5);
|
|
|
|
if (av_new_packet(pkt, size) < 0) {
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
pkt->stream_index = ffm->header[0];
|
|
if ((unsigned)pkt->stream_index >= s->nb_streams) {
|
|
av_log(s, AV_LOG_ERROR, "invalid stream index %d\n", pkt->stream_index);
|
|
av_packet_unref(pkt);
|
|
ffm->read_state = READ_HEADER;
|
|
return -1;
|
|
}
|
|
pkt->pos = avio_tell(s->pb);
|
|
if (ffm->header[1] & FLAG_KEY_FRAME)
|
|
pkt->flags |= AV_PKT_FLAG_KEY;
|
|
|
|
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_packet_unref(pkt);
|
|
return -1;
|
|
}
|
|
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;
|
|
pkt->duration = duration;
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* seek to a given time in the file. The file read pointer is
|
|
positioned at or before pts. XXX: the following code is quite
|
|
approximative */
|
|
static int ffm_seek(AVFormatContext *s, int stream_index, int64_t wanted_pts, int flags)
|
|
{
|
|
FFMContext *ffm = s->priv_data;
|
|
int64_t pos_min, pos_max, pos;
|
|
int64_t pts_min, pts_max, pts;
|
|
double pos1;
|
|
|
|
ff_dlog(s, "wanted_pts=%0.6f\n", wanted_pts / 1000000.0);
|
|
/* find the position using linear interpolation (better than
|
|
dichotomy in typical cases) */
|
|
if (ffm->write_index && ffm->write_index < ffm->file_size) {
|
|
if (get_dts(s, FFM_PACKET_SIZE) < wanted_pts) {
|
|
pos_min = FFM_PACKET_SIZE;
|
|
pos_max = ffm->write_index - FFM_PACKET_SIZE;
|
|
} else {
|
|
pos_min = ffm->write_index;
|
|
pos_max = ffm->file_size - FFM_PACKET_SIZE;
|
|
}
|
|
} else {
|
|
pos_min = FFM_PACKET_SIZE;
|
|
pos_max = ffm->file_size - FFM_PACKET_SIZE;
|
|
}
|
|
while (pos_min <= pos_max) {
|
|
pts_min = get_dts(s, pos_min);
|
|
pts_max = get_dts(s, pos_max);
|
|
if (pts_min > wanted_pts || pts_max <= wanted_pts) {
|
|
pos = pts_min > wanted_pts ? pos_min : pos_max;
|
|
goto found;
|
|
}
|
|
/* linear interpolation */
|
|
pos1 = (double)(pos_max - pos_min) * (double)(wanted_pts - pts_min) /
|
|
(double)(pts_max - pts_min);
|
|
pos = (((int64_t)pos1) / FFM_PACKET_SIZE) * FFM_PACKET_SIZE;
|
|
if (pos <= pos_min)
|
|
pos = pos_min;
|
|
else if (pos >= pos_max)
|
|
pos = pos_max;
|
|
pts = get_dts(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;
|
|
}
|
|
}
|
|
pos = (flags & AVSEEK_FLAG_BACKWARD) ? pos_min : pos_max;
|
|
|
|
found:
|
|
if (ffm_seek1(s, pos) < 0)
|
|
return -1;
|
|
|
|
/* reset read state */
|
|
ffm->read_state = READ_HEADER;
|
|
ffm->packet_ptr = ffm->packet;
|
|
ffm->packet_end = ffm->packet;
|
|
ffm->first_packet = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ffm_probe(AVProbeData *p)
|
|
{
|
|
if (
|
|
p->buf[0] == 'F' && p->buf[1] == 'F' && p->buf[2] == 'M' &&
|
|
(p->buf[3] == '1' || p->buf[3] == '2'))
|
|
return AVPROBE_SCORE_MAX + 1;
|
|
return 0;
|
|
}
|
|
|
|
static const AVOption options[] = {
|
|
{"server_attached", NULL, offsetof(FFMContext, server_attached), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, AV_OPT_FLAG_EXPORT },
|
|
{"ffm_write_index", NULL, offsetof(FFMContext, write_index), AV_OPT_TYPE_INT64, {.i64 = 0}, 0, INT64_MAX, AV_OPT_FLAG_EXPORT },
|
|
{"ffm_file_size", NULL, offsetof(FFMContext, file_size), AV_OPT_TYPE_INT64, {.i64 = 0}, 0, INT64_MAX, AV_OPT_FLAG_EXPORT },
|
|
{ NULL },
|
|
};
|
|
|
|
static const AVClass ffm_class = {
|
|
.class_name = "ffm demuxer",
|
|
.item_name = av_default_item_name,
|
|
.option = options,
|
|
.version = LIBAVUTIL_VERSION_INT,
|
|
};
|
|
AVInputFormat ff_ffm_demuxer = {
|
|
.name = "ffm",
|
|
.long_name = NULL_IF_CONFIG_SMALL("FFM (FFserver live feed)"),
|
|
.priv_data_size = sizeof(FFMContext),
|
|
.read_probe = ffm_probe,
|
|
.read_header = ffm_read_header,
|
|
.read_packet = ffm_read_packet,
|
|
.read_seek = ffm_seek,
|
|
.priv_class = &ffm_class,
|
|
};
|