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n3.4.14
libavformat/aixdec.c
140 строк
4 KB
Paul B Mahol
avformat: add AVFormatContext to ff_get_extradata()
14 апр 2016, 19:21
14 апр 2016, 19:21
323b8c9
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/* * AIX demuxer * Copyright (c) 2016 Paul B Mahol * * 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 "avformat.h" #include "internal.h" static int aix_probe(AVProbeData *p) { if (AV_RL32(p->buf) != MKTAG('A','I','X','F') || AV_RB32(p->buf + 8) != 0x01000014 || AV_RB32(p->buf + 12) != 0x00000800) return 0; return AVPROBE_SCORE_MAX; } static int aix_read_header(AVFormatContext *s) { unsigned nb_streams, first_offset, nb_segments; unsigned stream_list_offset; unsigned segment_list_offset = 0x20; unsigned segment_list_entry_size = 0x10; unsigned size; int i; avio_skip(s->pb, 4); first_offset = avio_rb32(s->pb) + 8; avio_skip(s->pb, 16); nb_segments = avio_rb16(s->pb); if (nb_segments == 0) return AVERROR_INVALIDDATA; stream_list_offset = segment_list_offset + segment_list_entry_size * nb_segments + 0x10; if (stream_list_offset >= first_offset) return AVERROR_INVALIDDATA; avio_seek(s->pb, stream_list_offset, SEEK_SET); nb_streams = avio_r8(s->pb); if (nb_streams == 0) return AVERROR_INVALIDDATA; avio_skip(s->pb, 7); for (i = 0; i < nb_streams; i++) { AVStream *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_ADX; st->codecpar->sample_rate = avio_rb32(s->pb); st->codecpar->channels = avio_r8(s->pb); avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); avio_skip(s->pb, 3); } avio_seek(s->pb, first_offset, SEEK_SET); for (i = 0; i < nb_streams; i++) { if (avio_rl32(s->pb) != MKTAG('A','I','X','P')) return AVERROR_INVALIDDATA; size = avio_rb32(s->pb); if (size <= 8) return AVERROR_INVALIDDATA; avio_skip(s->pb, 8); ff_get_extradata(s, s->streams[i]->codecpar, s->pb, size - 8); } return 0; } static int aix_read_packet(AVFormatContext *s, AVPacket *pkt) { unsigned size, index, duration, chunk; int64_t pos; int sequence, ret, i; pos = avio_tell(s->pb); if (avio_feof(s->pb)) return AVERROR_EOF; chunk = avio_rl32(s->pb); size = avio_rb32(s->pb); if (chunk == MKTAG('A','I','X','E')) { avio_skip(s->pb, size); for (i = 0; i < s->nb_streams; i++) { if (avio_feof(s->pb)) return AVERROR_EOF; chunk = avio_rl32(s->pb); size = avio_rb32(s->pb); avio_skip(s->pb, size); } pos = avio_tell(s->pb); chunk = avio_rl32(s->pb); size = avio_rb32(s->pb); } if (chunk != MKTAG('A','I','X','P')) return AVERROR_INVALIDDATA; if (size <= 8) return AVERROR_INVALIDDATA; index = avio_r8(s->pb); if (avio_r8(s->pb) != s->nb_streams || index >= s->nb_streams) return AVERROR_INVALIDDATA; duration = avio_rb16(s->pb); sequence = avio_rb32(s->pb); if (sequence < 0) { avio_skip(s->pb, size - 8); return 0; } ret = av_get_packet(s->pb, pkt, size - 8); pkt->stream_index = index; pkt->duration = duration; pkt->pos = pos; return ret; } AVInputFormat ff_aix_demuxer = { .name = "aix", .long_name = NULL_IF_CONFIG_SMALL("CRI AIX"), .read_probe = aix_probe, .read_header = aix_read_header, .read_packet = aix_read_packet, .extensions = "aix", .flags = AVFMT_GENERIC_INDEX, };