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#include "libavutil/intreadwrite.h" |
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#include "libavcodec/internal.h" |
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#include "avformat.h" |
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#include "internal.h" |
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static int probe(const AVProbeData *p) |
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{ |
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if (p->buf_size < 2096) |
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return 0; |
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if ( AV_RL32(p->buf ) != 1 |
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|| AV_RL32(p->buf + 8) > 100000 |
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|| AV_RL32(p->buf + 12) > 8 |
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|| AV_RL32(p->buf + 16) != 2096 |
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||!AV_RL32(p->buf + 21) |
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|| AV_RL16(p->buf + 25) != 2096 |
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|| AV_RL32(p->buf + 48) % AV_RL32(p->buf + 21) |
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) |
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return 0; |
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return AVPROBE_SCORE_EXTENSION; |
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} |
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static int read_header(AVFormatContext *s) |
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{ |
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AVStream *st = avformat_new_stream(s, NULL); |
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uint32_t data_offset; |
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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_MS; |
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avio_rl32(s->pb); |
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avio_rl32(s->pb); |
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st->codecpar->sample_rate = avio_rl32(s->pb); |
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st->codecpar->ch_layout.nb_channels = avio_rl32(s->pb); |
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if (st->codecpar->ch_layout.nb_channels > FF_SANE_NB_CHANNELS || |
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st->codecpar->ch_layout.nb_channels <= 0) |
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return AVERROR(ENOSYS); |
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ffformatcontext(s)->data_offset = data_offset = avio_rl32(s->pb); |
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avio_r8(s->pb); |
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st->codecpar->block_align = avio_rl32(s->pb); |
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if (st->codecpar->block_align > INT_MAX / FF_SANE_NB_CHANNELS || st->codecpar->block_align <= 0) |
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return AVERROR_INVALIDDATA; |
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st->codecpar->block_align *= st->codecpar->ch_layout.nb_channels; |
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avio_seek(s->pb, data_offset, SEEK_SET); |
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return 0; |
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} |
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static int read_packet(AVFormatContext *s, AVPacket *pkt) |
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{ |
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AVStream *st = s->streams[0]; |
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return av_get_packet(s->pb, pkt, st->codecpar->block_align); |
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} |
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const AVInputFormat ff_boa_demuxer = { |
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.name = "boa", |
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.long_name = NULL_IF_CONFIG_SMALL("Black Ops Audio"), |
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.read_probe = probe, |
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.read_header = read_header, |
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.read_packet = read_packet, |
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.flags = AVFMT_GENERIC_INDEX, |
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}; |
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