aba232cfa9
According to its description, it is supposed to be the LCM of all the frame durations. The usability of such a thing is vanishingly small, especially since we cannot determine it with any amount of reliability. Therefore get rid of it after the next bump. Replace it with the average framerate where it makes sense. FATE results for the wtv and xmv demux tests change. In the wtv case this is caused by the file being corrupted (or possibly badly cut) and containing invalid timestamps. This results in lavf estimating the framerate wrong and making up wrong frame durations. In the xmv case the file contains pts jumps, so again the estimated framerate is far from anything sane and lavf again makes up different frame durations. In some other tests lavf starts making up frame durations from different frame.
97 lines
2.9 KiB
C
97 lines
2.9 KiB
C
/*
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* VC-1 test bitstreams format muxer.
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* Copyright (c) 2008 Konstantin Shishkov
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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 "avformat.h"
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#include "internal.h"
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typedef struct RCVContext {
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int frames;
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} RCVContext;
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static int vc1test_write_header(AVFormatContext *s)
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{
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AVCodecContext *avc = s->streams[0]->codec;
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AVIOContext *pb = s->pb;
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if (avc->codec_id != CODEC_ID_WMV3) {
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av_log(s, AV_LOG_ERROR, "Only WMV3 is accepted!\n");
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return -1;
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}
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avio_wl24(pb, 0); //frames count will be here
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avio_w8(pb, 0xC5);
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avio_wl32(pb, 4);
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avio_write(pb, avc->extradata, 4);
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avio_wl32(pb, avc->height);
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avio_wl32(pb, avc->width);
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avio_wl32(pb, 0xC);
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avio_wl24(pb, 0); // hrd_buffer
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avio_w8(pb, 0x80); // level|cbr|res1
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avio_wl32(pb, 0); // hrd_rate
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if (s->streams[0]->avg_frame_rate.den && s->streams[0]->avg_frame_rate.num == 1)
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avio_wl32(pb, s->streams[0]->avg_frame_rate.den);
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else
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avio_wl32(pb, 0xFFFFFFFF); //variable framerate
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avpriv_set_pts_info(s->streams[0], 32, 1, 1000);
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return 0;
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}
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static int vc1test_write_packet(AVFormatContext *s, AVPacket *pkt)
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{
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RCVContext *ctx = s->priv_data;
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AVIOContext *pb = s->pb;
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if (!pkt->size)
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return 0;
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avio_wl32(pb, pkt->size | ((pkt->flags & AV_PKT_FLAG_KEY) ? 0x80000000 : 0));
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avio_wl32(pb, pkt->pts);
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avio_write(pb, pkt->data, pkt->size);
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avio_flush(pb);
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ctx->frames++;
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return 0;
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}
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static int vc1test_write_trailer(AVFormatContext *s)
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{
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RCVContext *ctx = s->priv_data;
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AVIOContext *pb = s->pb;
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if (s->pb->seekable) {
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avio_seek(pb, 0, SEEK_SET);
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avio_wl24(pb, ctx->frames);
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avio_flush(pb);
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}
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return 0;
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}
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AVOutputFormat ff_vc1t_muxer = {
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.name = "rcv",
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.long_name = NULL_IF_CONFIG_SMALL("VC-1 test bitstream"),
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.mime_type = "",
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.extensions = "rcv",
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.priv_data_size = sizeof(RCVContext),
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.audio_codec = CODEC_ID_NONE,
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.video_codec = CODEC_ID_WMV3,
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.write_header = vc1test_write_header,
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.write_packet = vc1test_write_packet,
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.write_trailer = vc1test_write_trailer,
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};
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