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https://github.com/FFmpeg/FFmpeg.git
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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.
274 lines
9.1 KiB
C
274 lines
9.1 KiB
C
/*
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* NuppelVideo demuxer.
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* Copyright (c) 2006 Reimar Doeffinger
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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 "libavutil/intreadwrite.h"
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#include "libavutil/intfloat.h"
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#include "avformat.h"
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#include "internal.h"
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#include "riff.h"
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typedef struct {
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int v_id;
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int a_id;
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int rtjpg_video;
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} NUVContext;
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typedef enum {
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NUV_VIDEO = 'V',
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NUV_EXTRADATA = 'D',
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NUV_AUDIO = 'A',
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NUV_SEEKP = 'R',
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NUV_MYTHEXT = 'X'
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} nuv_frametype;
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static int nuv_probe(AVProbeData *p) {
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if (!memcmp(p->buf, "NuppelVideo", 12))
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return AVPROBE_SCORE_MAX;
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if (!memcmp(p->buf, "MythTVVideo", 12))
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return AVPROBE_SCORE_MAX;
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return 0;
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}
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/// little macro to sanitize packet size
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#define PKTSIZE(s) (s & 0xffffff)
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/**
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* @brief read until we found all data needed for decoding
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* @param vst video stream of which to change parameters
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* @param ast video stream of which to change parameters
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* @param myth set if this is a MythTVVideo format file
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* @return 1 if all required codec data was found
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*/
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static int get_codec_data(AVIOContext *pb, AVStream *vst,
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AVStream *ast, int myth) {
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nuv_frametype frametype;
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if (!vst && !myth)
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return 1; // no codec data needed
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while (!pb->eof_reached) {
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int size, subtype;
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frametype = avio_r8(pb);
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switch (frametype) {
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case NUV_EXTRADATA:
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subtype = avio_r8(pb);
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avio_skip(pb, 6);
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size = PKTSIZE(avio_rl32(pb));
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if (vst && subtype == 'R') {
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vst->codec->extradata_size = size;
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vst->codec->extradata = av_malloc(size);
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avio_read(pb, vst->codec->extradata, size);
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size = 0;
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if (!myth)
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return 1;
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}
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break;
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case NUV_MYTHEXT:
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avio_skip(pb, 7);
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size = PKTSIZE(avio_rl32(pb));
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if (size != 128 * 4)
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break;
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avio_rl32(pb); // version
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if (vst) {
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vst->codec->codec_tag = avio_rl32(pb);
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vst->codec->codec_id =
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ff_codec_get_id(ff_codec_bmp_tags, vst->codec->codec_tag);
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if (vst->codec->codec_tag == MKTAG('R', 'J', 'P', 'G'))
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vst->codec->codec_id = CODEC_ID_NUV;
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} else
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avio_skip(pb, 4);
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if (ast) {
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ast->codec->codec_tag = avio_rl32(pb);
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ast->codec->sample_rate = avio_rl32(pb);
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ast->codec->bits_per_coded_sample = avio_rl32(pb);
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ast->codec->channels = avio_rl32(pb);
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ast->codec->codec_id =
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ff_wav_codec_get_id(ast->codec->codec_tag,
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ast->codec->bits_per_coded_sample);
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ast->need_parsing = AVSTREAM_PARSE_FULL;
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} else
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avio_skip(pb, 4 * 4);
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size -= 6 * 4;
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avio_skip(pb, size);
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return 1;
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case NUV_SEEKP:
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size = 11;
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break;
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default:
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avio_skip(pb, 7);
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size = PKTSIZE(avio_rl32(pb));
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break;
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}
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avio_skip(pb, size);
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}
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return 0;
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}
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static int nuv_header(AVFormatContext *s) {
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NUVContext *ctx = s->priv_data;
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AVIOContext *pb = s->pb;
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char id_string[12];
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double aspect, fps;
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int is_mythtv, width, height, v_packs, a_packs;
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int stream_nr = 0;
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AVStream *vst = NULL, *ast = NULL;
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avio_read(pb, id_string, 12);
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is_mythtv = !memcmp(id_string, "MythTVVideo", 12);
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avio_skip(pb, 5); // version string
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avio_skip(pb, 3); // padding
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width = avio_rl32(pb);
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height = avio_rl32(pb);
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avio_rl32(pb); // unused, "desiredwidth"
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avio_rl32(pb); // unused, "desiredheight"
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avio_r8(pb); // 'P' == progressive, 'I' == interlaced
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avio_skip(pb, 3); // padding
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aspect = av_int2double(avio_rl64(pb));
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if (aspect > 0.9999 && aspect < 1.0001)
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aspect = 4.0 / 3.0;
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fps = av_int2double(avio_rl64(pb));
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// number of packets per stream type, -1 means unknown, e.g. streaming
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v_packs = avio_rl32(pb);
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a_packs = avio_rl32(pb);
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avio_rl32(pb); // text
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avio_rl32(pb); // keyframe distance (?)
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if (v_packs) {
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ctx->v_id = stream_nr++;
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vst = avformat_new_stream(s, NULL);
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if (!vst)
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return AVERROR(ENOMEM);
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vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
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vst->codec->codec_id = CODEC_ID_NUV;
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vst->codec->width = width;
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vst->codec->height = height;
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vst->codec->bits_per_coded_sample = 10;
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vst->sample_aspect_ratio = av_d2q(aspect * height / width, 10000);
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#if FF_API_R_FRAME_RATE
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vst->r_frame_rate =
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#endif
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vst->avg_frame_rate = av_d2q(fps, 60000);
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avpriv_set_pts_info(vst, 32, 1, 1000);
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} else
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ctx->v_id = -1;
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if (a_packs) {
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ctx->a_id = stream_nr++;
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ast = avformat_new_stream(s, NULL);
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if (!ast)
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return AVERROR(ENOMEM);
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ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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ast->codec->codec_id = CODEC_ID_PCM_S16LE;
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ast->codec->channels = 2;
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ast->codec->sample_rate = 44100;
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ast->codec->bit_rate = 2 * 2 * 44100 * 8;
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ast->codec->block_align = 2 * 2;
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ast->codec->bits_per_coded_sample = 16;
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avpriv_set_pts_info(ast, 32, 1, 1000);
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} else
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ctx->a_id = -1;
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get_codec_data(pb, vst, ast, is_mythtv);
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ctx->rtjpg_video = vst && vst->codec->codec_id == CODEC_ID_NUV;
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return 0;
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}
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#define HDRSIZE 12
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static int nuv_packet(AVFormatContext *s, AVPacket *pkt) {
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NUVContext *ctx = s->priv_data;
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AVIOContext *pb = s->pb;
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uint8_t hdr[HDRSIZE];
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nuv_frametype frametype;
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int ret, size;
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while (!pb->eof_reached) {
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int copyhdrsize = ctx->rtjpg_video ? HDRSIZE : 0;
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uint64_t pos = avio_tell(pb);
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ret = avio_read(pb, hdr, HDRSIZE);
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if (ret < HDRSIZE)
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return ret < 0 ? ret : AVERROR(EIO);
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frametype = hdr[0];
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size = PKTSIZE(AV_RL32(&hdr[8]));
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switch (frametype) {
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case NUV_EXTRADATA:
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if (!ctx->rtjpg_video) {
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avio_skip(pb, size);
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break;
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}
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case NUV_VIDEO:
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if (ctx->v_id < 0) {
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av_log(s, AV_LOG_ERROR, "Video packet in file without video stream!\n");
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avio_skip(pb, size);
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break;
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}
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ret = av_new_packet(pkt, copyhdrsize + size);
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if (ret < 0)
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return ret;
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// HACK: we have no idea if it is a keyframe,
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// but if we mark none seeking will not work at all.
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pkt->flags |= AV_PKT_FLAG_KEY;
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pkt->pos = pos;
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pkt->pts = AV_RL32(&hdr[4]);
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pkt->stream_index = ctx->v_id;
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memcpy(pkt->data, hdr, copyhdrsize);
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ret = avio_read(pb, pkt->data + copyhdrsize, size);
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if (ret < 0) {
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av_free_packet(pkt);
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return ret;
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}
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if (ret < size)
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av_shrink_packet(pkt, copyhdrsize + ret);
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return 0;
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case NUV_AUDIO:
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if (ctx->a_id < 0) {
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av_log(s, AV_LOG_ERROR, "Audio packet in file without audio stream!\n");
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avio_skip(pb, size);
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break;
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}
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ret = av_get_packet(pb, pkt, size);
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pkt->flags |= AV_PKT_FLAG_KEY;
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pkt->pos = pos;
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pkt->pts = AV_RL32(&hdr[4]);
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pkt->stream_index = ctx->a_id;
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if (ret < 0) return ret;
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return 0;
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case NUV_SEEKP:
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// contains no data, size value is invalid
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break;
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default:
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avio_skip(pb, size);
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break;
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}
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}
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return AVERROR(EIO);
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}
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AVInputFormat ff_nuv_demuxer = {
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.name = "nuv",
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.long_name = NULL_IF_CONFIG_SMALL("NuppelVideo format"),
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.priv_data_size = sizeof(NUVContext),
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.read_probe = nuv_probe,
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.read_header = nuv_header,
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.read_packet = nuv_packet,
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.flags = AVFMT_GENERIC_INDEX,
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};
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