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119 lines
3.7 KiB
119 lines
3.7 KiB
/* |
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* IRCAM demuxer |
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* Copyright (c) 2012 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 "libavcodec/internal.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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#include "ircam.h" |
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static int ircam_probe(const AVProbeData *p) |
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{ |
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if ((p->buf[0] == 0x64 && p->buf[1] == 0xA3 && p->buf[3] == 0x00 && |
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p->buf[2] >= 1 && p->buf[2] <= 4) || |
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(p->buf[3] == 0x64 && p->buf[2] == 0xA3 && p->buf[0] == 0x00 && |
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p->buf[1] >= 1 && p->buf[1] <= 3) && |
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AV_RN32(p->buf + 4) && AV_RN32(p->buf + 8)) |
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return AVPROBE_SCORE_MAX / 4 * 3; |
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return 0; |
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} |
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static const struct endianess { |
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uint32_t magic; |
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int is_le; |
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} table[] = { |
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{ 0x64A30100, 0 }, |
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{ 0x64A30200, 1 }, |
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{ 0x64A30300, 0 }, |
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{ 0x64A30400, 1 }, |
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{ 0x0001A364, 1 }, |
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{ 0x0002A364, 0 }, |
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{ 0x0003A364, 1 }, |
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}; |
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static int ircam_read_header(AVFormatContext *s) |
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{ |
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uint32_t magic, sample_rate, channels, tag; |
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const AVCodecTag *tags; |
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int le = -1, i; |
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AVStream *st; |
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magic = avio_rl32(s->pb); |
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for (i = 0; i < 7; i++) { |
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if (magic == table[i].magic) { |
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le = table[i].is_le; |
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break; |
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} |
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} |
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if (le == 1) { |
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sample_rate = lrintf(av_int2float(avio_rl32(s->pb))); |
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channels = avio_rl32(s->pb); |
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tag = avio_rl32(s->pb); |
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tags = ff_codec_ircam_le_tags; |
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} else if (le == 0) { |
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sample_rate = lrintf(av_int2float(avio_rb32(s->pb))); |
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channels = avio_rb32(s->pb); |
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tag = avio_rb32(s->pb); |
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tags = ff_codec_ircam_be_tags; |
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} else { |
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return AVERROR_INVALIDDATA; |
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} |
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if (!channels || !sample_rate) |
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return AVERROR_INVALIDDATA; |
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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 = channels; |
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if (st->codecpar->ch_layout.nb_channels > FF_SANE_NB_CHANNELS) |
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return AVERROR(ENOSYS); |
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st->codecpar->sample_rate = sample_rate; |
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st->codecpar->codec_id = ff_codec_get_id(tags, tag); |
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if (st->codecpar->codec_id == AV_CODEC_ID_NONE) { |
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av_log(s, AV_LOG_ERROR, "unknown tag %"PRIx32"\n", tag); |
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return AVERROR_INVALIDDATA; |
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} |
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st->codecpar->bits_per_coded_sample = av_get_bits_per_sample(st->codecpar->codec_id); |
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st->codecpar->block_align = st->codecpar->bits_per_coded_sample * |
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st->codecpar->ch_layout.nb_channels / 8; |
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avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); |
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avio_skip(s->pb, 1008); |
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return 0; |
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} |
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const AVInputFormat ff_ircam_demuxer = { |
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.name = "ircam", |
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.long_name = NULL_IF_CONFIG_SMALL("Berkeley/IRCAM/CARL Sound Format"), |
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.read_probe = ircam_probe, |
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.read_header = ircam_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 = "sf,ircam", |
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.flags = AVFMT_GENERIC_INDEX, |
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};
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