mirror of https://github.com/FFmpeg/FFmpeg.git
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/*
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* SDR2 demuxer |
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* Copyright (c) 2014 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/intreadwrite.h" |
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#include "avformat.h" |
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#include "internal.h" |
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static int sdr2_probe(AVProbeData *p) |
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{ |
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if (AV_RL32(p->buf) != MKTAG('S', 'R', 'A', 1)) |
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return 0; |
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return AVPROBE_SCORE_EXTENSION; |
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} |
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#define FIRST 0xA8 |
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static int sdr2_read_header(AVFormatContext *s) |
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{ |
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AVStream *st, *ast; |
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ast = avformat_new_stream(s, 0); |
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if (!ast) |
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return AVERROR(ENOMEM); |
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st = avformat_new_stream(s, 0); |
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if (!st) |
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return AVERROR(ENOMEM); |
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avio_skip(s->pb, 20); |
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avpriv_set_pts_info(st, 64, 1, avio_rl32(s->pb)); |
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st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
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st->codec->width = avio_rl32(s->pb); |
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st->codec->height = avio_rl32(s->pb); |
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st->codec->codec_id = AV_CODEC_ID_H264; |
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ast->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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ast->codec->channels = 1; |
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ast->codec->sample_rate = 8000; |
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ast->codec->codec_id = AV_CODEC_ID_PCM_S16LE; |
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avpriv_set_pts_info(ast, 64, 1, 8000); |
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avio_seek(s->pb, FIRST, SEEK_SET); |
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return 0; |
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} |
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static const uint8_t header[24] = { |
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0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0x00, 0x1e, |
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0xa6, 0x80, 0xb0, 0x7e, 0x40, 0x00, 0x00, 0x00, |
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0x01, 0x68, 0xce, 0x38, 0x80, 0x00, 0x00, 0x00 |
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}; |
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static int sdr2_read_packet(AVFormatContext *s, AVPacket *pkt) |
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{ |
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int64_t pos; |
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unsigned next; |
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int flags, ret = 0, is_video; |
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pos = avio_tell(s->pb); |
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flags = avio_rl32(s->pb); |
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avio_skip(s->pb, 4); |
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next = avio_rl32(s->pb); |
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if (next <= 52) |
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return AVERROR_INVALIDDATA; |
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avio_skip(s->pb, 6); |
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is_video = avio_rl32(s->pb); |
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avio_skip(s->pb, 30); |
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if (pos == FIRST) { |
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if (av_new_packet(pkt, next - 52 + 24) < 0) |
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return AVERROR(ENOMEM); |
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memcpy(pkt->data, header, 24); |
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ret = avio_read(s->pb, pkt->data + 24, next - 52); |
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if (ret < 0) { |
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av_free_packet(pkt); |
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return ret; |
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} |
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av_shrink_packet(pkt, ret + 24); |
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} else { |
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ret = av_get_packet(s->pb, pkt, next - 52); |
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} |
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pkt->stream_index = !!is_video; |
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pkt->pos = pos; |
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if (flags & (1 << 12)) |
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pkt->flags |= AV_PKT_FLAG_KEY; |
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return ret; |
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} |
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AVInputFormat ff_sdr2_demuxer = { |
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.name = "sdr2", |
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.long_name = NULL_IF_CONFIG_SMALL("SDR2"), |
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.read_probe = sdr2_probe, |
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.read_header = sdr2_read_header, |
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.read_packet = sdr2_read_packet, |
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.extensions = "sdr2", |
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.flags = AVFMT_GENERIC_INDEX, |
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}; |
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