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90 lines
2.5 KiB
90 lines
2.5 KiB
/* |
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* SDX demuxer |
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* Copyright (c) 2017 Paul B Mahol |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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/avstring.h" |
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#include "libavutil/intreadwrite.h" |
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#include "avformat.h" |
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#include "internal.h" |
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#include "pcm.h" |
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static int sdx_probe(const AVProbeData *p) |
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{ |
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if (AV_RB32(p->buf) == AV_RB32("SDX:")) |
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return AVPROBE_SCORE_EXTENSION; |
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return 0; |
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} |
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static int sdx_read_header(AVFormatContext *s) |
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{ |
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AVStream *st; |
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int depth, length; |
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avio_skip(s->pb, 4); |
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while (!avio_feof(s->pb)) { |
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if (avio_r8(s->pb) == 0x1a) |
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break; |
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} |
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if (avio_r8(s->pb) != 1) |
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return AVERROR_INVALIDDATA; |
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length = avio_r8(s->pb); |
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avio_skip(s->pb, length); |
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avio_skip(s->pb, 4); |
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depth = avio_r8(s->pb); |
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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->ch_layout.nb_channels = 1; |
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st->codecpar->sample_rate = avio_rl32(s->pb); |
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switch (depth) { |
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case 8: |
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st->codecpar->codec_id = AV_CODEC_ID_PCM_U8; |
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break; |
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case 16: |
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st->codecpar->codec_id = AV_CODEC_ID_PCM_U16LE; |
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break; |
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case 24: |
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st->codecpar->codec_id = AV_CODEC_ID_PCM_U24LE; |
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break; |
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case 32: |
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st->codecpar->codec_id = AV_CODEC_ID_PCM_U32LE; |
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break; |
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default: |
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return AVERROR_INVALIDDATA; |
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} |
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avio_skip(s->pb, 16); |
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st->codecpar->block_align = depth / 8; |
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return 0; |
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} |
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const AVInputFormat ff_sdx_demuxer = { |
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.name = "sdx", |
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.long_name = NULL_IF_CONFIG_SMALL("Sample Dump eXchange"), |
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.read_probe = sdx_probe, |
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.read_header = sdx_read_header, |
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.read_packet = ff_pcm_read_packet, |
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.read_seek = ff_pcm_read_seek, |
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.extensions = "sdx", |
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.flags = AVFMT_GENERIC_INDEX, |
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};
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