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#include "libavutil/intreadwrite.h" |
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#include "avformat.h" |
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#include "demux.h" |
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#include "internal.h" |
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static int aix_probe(const AVProbeData *p) |
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{ |
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if (AV_RL32(p->buf) != MKTAG('A','I','X','F') || |
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AV_RB32(p->buf + 8) != 0x01000014 || |
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AV_RB32(p->buf + 12) != 0x00000800) |
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return 0; |
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return AVPROBE_SCORE_MAX; |
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} |
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static int aix_read_header(AVFormatContext *s) |
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{ |
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unsigned nb_streams, first_offset, nb_segments; |
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unsigned stream_list_offset; |
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unsigned segment_list_offset = 0x20; |
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unsigned segment_list_entry_size = 0x10; |
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unsigned size; |
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int i; |
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avio_skip(s->pb, 4); |
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first_offset = avio_rb32(s->pb) + 8; |
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avio_skip(s->pb, 16); |
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nb_segments = avio_rb16(s->pb); |
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if (nb_segments == 0) |
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return AVERROR_INVALIDDATA; |
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stream_list_offset = segment_list_offset + segment_list_entry_size * nb_segments + 0x10; |
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if (stream_list_offset >= first_offset) |
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return AVERROR_INVALIDDATA; |
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avio_seek(s->pb, stream_list_offset, SEEK_SET); |
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nb_streams = avio_r8(s->pb); |
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if (nb_streams == 0) |
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return AVERROR_INVALIDDATA; |
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avio_skip(s->pb, 7); |
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for (i = 0; i < nb_streams; i++) { |
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AVStream *st = avformat_new_stream(s, NULL); |
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if (!st) |
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return AVERROR(ENOMEM); |
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
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st->codecpar->codec_id = AV_CODEC_ID_ADPCM_ADX; |
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st->codecpar->sample_rate = avio_rb32(s->pb); |
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st->codecpar->ch_layout.nb_channels = avio_r8(s->pb); |
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avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); |
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avio_skip(s->pb, 3); |
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} |
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avio_seek(s->pb, first_offset, SEEK_SET); |
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for (i = 0; i < nb_streams; i++) { |
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if (avio_rl32(s->pb) != MKTAG('A','I','X','P')) |
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return AVERROR_INVALIDDATA; |
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size = avio_rb32(s->pb); |
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if (size <= 8) |
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return AVERROR_INVALIDDATA; |
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avio_skip(s->pb, 8); |
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ff_get_extradata(s, s->streams[i]->codecpar, s->pb, size - 8); |
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} |
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return 0; |
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} |
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static int aix_read_packet(AVFormatContext *s, AVPacket *pkt) |
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{ |
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unsigned size, index, duration, chunk; |
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int64_t pos; |
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int sequence, ret, i; |
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pos = avio_tell(s->pb); |
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if (avio_feof(s->pb)) |
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return AVERROR_EOF; |
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chunk = avio_rl32(s->pb); |
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size = avio_rb32(s->pb); |
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if (chunk == MKTAG('A','I','X','E')) { |
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avio_skip(s->pb, size); |
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for (i = 0; i < s->nb_streams; i++) { |
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if (avio_feof(s->pb)) |
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return AVERROR_EOF; |
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chunk = avio_rl32(s->pb); |
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size = avio_rb32(s->pb); |
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avio_skip(s->pb, size); |
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} |
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pos = avio_tell(s->pb); |
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chunk = avio_rl32(s->pb); |
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size = avio_rb32(s->pb); |
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} |
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if (chunk != MKTAG('A','I','X','P')) |
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return AVERROR_INVALIDDATA; |
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if (size <= 8) |
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return AVERROR_INVALIDDATA; |
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index = avio_r8(s->pb); |
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if (avio_r8(s->pb) != s->nb_streams || index >= s->nb_streams) |
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return AVERROR_INVALIDDATA; |
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duration = avio_rb16(s->pb); |
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sequence = avio_rb32(s->pb); |
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if (sequence < 0) { |
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avio_skip(s->pb, size - 8); |
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return 0; |
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} |
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ret = av_get_packet(s->pb, pkt, size - 8); |
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pkt->stream_index = index; |
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pkt->duration = duration; |
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pkt->pos = pos; |
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return ret; |
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} |
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const AVInputFormat ff_aix_demuxer = { |
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.name = "aix", |
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.long_name = NULL_IF_CONFIG_SMALL("CRI AIX"), |
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.read_probe = aix_probe, |
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.read_header = aix_read_header, |
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.read_packet = aix_read_packet, |
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.extensions = "aix", |
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.flags = AVFMT_GENERIC_INDEX, |
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}; |
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