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n3.4.14
libavformat/thp.c
224 строки
7 KB
Michael Niedermayer
avformat/thp: Check fps
02 июл 2020, 20:55
02 июл 2020, 20:55
685a7d6
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/* * THP Demuxer * Copyright (c) 2007 Marco Gerards * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "libavutil/intreadwrite.h" #include "libavutil/intfloat.h" #include "avformat.h" #include "internal.h" typedef struct ThpDemuxContext { int version; unsigned first_frame; unsigned first_framesz; unsigned last_frame; int compoff; unsigned framecnt; AVRational fps; unsigned frame; int64_t next_frame; unsigned next_framesz; int video_stream_index; int audio_stream_index; int compcount; unsigned char components[16]; AVStream* vst; int has_audio; unsigned audiosize; } ThpDemuxContext; static int thp_probe(AVProbeData *p) { double d; /* check file header */ if (AV_RL32(p->buf) != MKTAG('T', 'H', 'P', '\0')) return 0; d = av_int2float(AV_RB32(p->buf + 16)); if (d < 0.1 || d > 1000 || isnan(d)) return AVPROBE_SCORE_MAX/4; return AVPROBE_SCORE_MAX; } static int thp_read_header(AVFormatContext *s) { ThpDemuxContext *thp = s->priv_data; AVStream *st; AVIOContext *pb = s->pb; int64_t fsize= avio_size(pb); int i; /* Read the file header. */ avio_rb32(pb); /* Skip Magic. */ thp->version = avio_rb32(pb); avio_rb32(pb); /* Max buf size. */ avio_rb32(pb); /* Max samples. */ thp->fps = av_d2q(av_int2float(avio_rb32(pb)), INT_MAX); if (thp->fps.den <= 0 || thp->fps.num < 0) return AVERROR_INVALIDDATA; thp->framecnt = avio_rb32(pb); thp->first_framesz = avio_rb32(pb); pb->maxsize = avio_rb32(pb); if(fsize>0 && (!pb->maxsize || fsize < pb->maxsize)) pb->maxsize= fsize; thp->compoff = avio_rb32(pb); avio_rb32(pb); /* offsetDataOffset. */ thp->first_frame = avio_rb32(pb); thp->last_frame = avio_rb32(pb); thp->next_framesz = thp->first_framesz; thp->next_frame = thp->first_frame; /* Read the component structure. */ avio_seek (pb, thp->compoff, SEEK_SET); thp->compcount = avio_rb32(pb); if (thp->compcount > FF_ARRAY_ELEMS(thp->components)) return AVERROR_INVALIDDATA; /* Read the list of component types. */ avio_read(pb, thp->components, 16); for (i = 0; i < thp->compcount; i++) { if (thp->components[i] == 0) { if (thp->vst) break; /* Video component. */ st = avformat_new_stream(s, NULL); if (!st) return AVERROR(ENOMEM); /* The denominator and numerator are switched because 1/fps is required. */ avpriv_set_pts_info(st, 64, thp->fps.den, thp->fps.num); st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; st->codecpar->codec_id = AV_CODEC_ID_THP; st->codecpar->codec_tag = 0; /* no fourcc */ st->codecpar->width = avio_rb32(pb); st->codecpar->height = avio_rb32(pb); st->codecpar->sample_rate = av_q2d(thp->fps); st->nb_frames = st->duration = thp->framecnt; thp->vst = st; thp->video_stream_index = st->index; if (thp->version == 0x11000) avio_rb32(pb); /* Unknown. */ } else if (thp->components[i] == 1) { if (thp->has_audio != 0) break; /* Audio component. */ st = avformat_new_stream(s, NULL); if (!st) return AVERROR(ENOMEM); st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; st->codecpar->codec_id = AV_CODEC_ID_ADPCM_THP; st->codecpar->codec_tag = 0; /* no fourcc */ st->codecpar->channels = avio_rb32(pb); /* numChannels. */ st->codecpar->sample_rate = avio_rb32(pb); /* Frequency. */ st->duration = avio_rb32(pb); avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); thp->audio_stream_index = st->index; thp->has_audio = 1; } } if (!thp->vst) return AVERROR_INVALIDDATA; return 0; } static int thp_read_packet(AVFormatContext *s, AVPacket *pkt) { ThpDemuxContext *thp = s->priv_data; AVIOContext *pb = s->pb; unsigned int size; int ret; if (thp->audiosize == 0) { /* Terminate when last frame is reached. */ if (thp->frame >= thp->framecnt) return AVERROR_EOF; avio_seek(pb, thp->next_frame, SEEK_SET); /* Locate the next frame and read out its size. */ thp->next_frame += FFMAX(thp->next_framesz, 1); thp->next_framesz = avio_rb32(pb); avio_rb32(pb); /* Previous total size. */ size = avio_rb32(pb); /* Total size of this frame. */ /* Store the audiosize so the next time this function is called, the audio can be read. */ if (thp->has_audio) thp->audiosize = avio_rb32(pb); /* Audio size. */ else thp->frame++; ret = av_get_packet(pb, pkt, size); if (ret < 0) return ret; if (ret != size) { av_packet_unref(pkt); return AVERROR(EIO); } pkt->stream_index = thp->video_stream_index; } else { ret = av_get_packet(pb, pkt, thp->audiosize); if (ret < 0) return ret; if (ret != thp->audiosize) { av_packet_unref(pkt); return AVERROR(EIO); } pkt->stream_index = thp->audio_stream_index; if (thp->audiosize >= 8) pkt->duration = AV_RB32(&pkt->data[4]); thp->audiosize = 0; thp->frame++; } return 0; } AVInputFormat ff_thp_demuxer = { .name = "thp", .long_name = NULL_IF_CONFIG_SMALL("THP"), .priv_data_size = sizeof(ThpDemuxContext), .read_probe = thp_probe, .read_header = thp_read_header, .read_packet = thp_read_packet };