diff options
author | Paul B Mahol <onemda@gmail.com> | 2012-12-02 22:13:56 +0400 |
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committer | Paul B Mahol <onemda@gmail.com> | 2012-12-05 17:01:22 +0400 |
commit | 880191637ff7223541cd2e4db748c6e07fee596c (patch) | |
tree | 61c054fed56241b765a11fbc066657d0687b371d /libavformat/ircamdec.c | |
parent | 8ecf22ffb01e2fa721d7449e33ee9fb5a7937697 (diff) |
IRCAM demuxer & muxer
Signed-off-by: Paul B Mahol <onemda@gmail.com>
Diffstat (limited to 'libavformat/ircamdec.c')
-rw-r--r-- | libavformat/ircamdec.c | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/libavformat/ircamdec.c b/libavformat/ircamdec.c new file mode 100644 index 0000000000..f9533ec4a5 --- /dev/null +++ b/libavformat/ircamdec.c @@ -0,0 +1,115 @@ +/* + * IRCAM demuxer + * Copyright (c) 2012 Paul B Mahol + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "libavutil/intreadwrite.h" +#include "avformat.h" +#include "internal.h" +#include "pcm.h" +#include "ircam.h" + +static int ircam_probe(AVProbeData *p) +{ + if ((p->buf[0] == 0x64 && p->buf[1] == 0xA3 && p->buf[3] == 0x00 && + p->buf[2] >= 1 && p->buf[2] <= 4) || + (p->buf[3] == 0x64 && p->buf[2] == 0xA3 && p->buf[0] == 0x00 && + p->buf[1] >= 1 && p->buf[1] <= 3) && + AV_RN32(p->buf + 4) && AV_RN32(p->buf + 8)) + return AVPROBE_SCORE_MAX / 4 * 3; + return 0; +} + +static const struct endianess { + uint32_t magic; + int is_le; +} table[] = { + { 0x64A30100, 0 }, + { 0x64A30200, 1 }, + { 0x64A30300, 0 }, + { 0x64A30400, 1 }, + { 0x0001A364, 1 }, + { 0x0002A364, 0 }, + { 0x0003A364, 1 }, +}; + +static int ircam_read_header(AVFormatContext *s) +{ + uint32_t magic, sample_rate, channels, tag; + const AVCodecTag *tags; + int le = -1, i; + AVStream *st; + + magic = avio_rl32(s->pb); + for (i = 0; i < 7; i++) { + if (magic == table[i].magic) { + le = table[i].is_le; + break; + } + } + + if (le == 1) { + sample_rate = av_int2float(avio_rl32(s->pb)); + channels = avio_rl32(s->pb); + tag = avio_rl32(s->pb); + tags = ff_codec_ircam_le_tags; + } else if (le == 0) { + sample_rate = av_int2float(avio_rb32(s->pb)); + channels = avio_rb32(s->pb); + tag = avio_rb32(s->pb); + tags = ff_codec_ircam_be_tags; + } else { + return AVERROR_INVALIDDATA; + } + + if (!channels || !sample_rate) + return AVERROR_INVALIDDATA; + + st = avformat_new_stream(s, NULL); + if (!st) + return AVERROR(ENOMEM); + + st->codec->codec_type = AVMEDIA_TYPE_AUDIO; + st->codec->channels = channels; + st->codec->sample_rate = sample_rate; + + st->codec->codec_id = ff_codec_get_id(tags, tag); + if (st->codec->codec_id == AV_CODEC_ID_NONE) { + av_log(s, AV_LOG_ERROR, "unknown tag %X\n", tag); + return AVERROR_INVALIDDATA; + } + + st->codec->bits_per_coded_sample = av_get_bits_per_sample(st->codec->codec_id); + st->codec->block_align = st->codec->bits_per_coded_sample * st->codec->channels / 8; + avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); + avio_skip(s->pb, 1008); + + return 0; +} + +AVInputFormat ff_ircam_demuxer = { + .name = "ircam", + .long_name = NULL_IF_CONFIG_SMALL("Berkeley/IRCAM/CARL Sound Format"), + .read_probe = ircam_probe, + .read_header = ircam_read_header, + .read_packet = ff_pcm_read_packet, + .read_seek = ff_pcm_read_seek, + .extensions = "sf,ircam", + .flags = AVFMT_GENERIC_INDEX, +}; |