making act segmenter

1 files changed, 211 insertions, 0 deletions

diff --git a/ffmpeg/libavformat/au.c b/ffmpeg/libavformat/au.c
new file mode 100644
index 0000000..a29e802
--- /dev/null
+++ b/ffmpeg/libavformat/au.c
@@ -0,0 +1,211 @@
+/*
+ * AU muxer and demuxer
+ * Copyright (c) 2001 Fabrice Bellard
+ *
+ * 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
+ */
+
+/*
+ * First version by Francois Revol revol@free.fr
+ *
+ * Reference documents:
+ * http://www.opengroup.org/public/pubs/external/auformat.html
+ * http://www.goice.co.jp/member/mo/formats/au.html
+ */
+
+#include "avformat.h"
+#include "internal.h"
+#include "avio_internal.h"
+#include "pcm.h"
+
+/* if we don't know the size in advance */
+#define AU_UNKNOWN_SIZE ((uint32_t)(~0))
+/* the specification requires an annotation field of at least eight bytes */
+#define AU_HEADER_SIZE (24+8)
+
+static const AVCodecTag codec_au_tags[] = {
+    { AV_CODEC_ID_PCM_MULAW,  1 },
+    { AV_CODEC_ID_PCM_S8,     2 },
+    { AV_CODEC_ID_PCM_S16BE,  3 },
+    { AV_CODEC_ID_PCM_S24BE,  4 },
+    { AV_CODEC_ID_PCM_S32BE,  5 },
+    { AV_CODEC_ID_PCM_F32BE,  6 },
+    { AV_CODEC_ID_PCM_F64BE,  7 },
+    { AV_CODEC_ID_ADPCM_G722,24 },
+    { AV_CODEC_ID_PCM_ALAW,  27 },
+    { AV_CODEC_ID_NONE,       0 },
+};
+
+#if CONFIG_AU_DEMUXER
+
+static int au_probe(AVProbeData *p)
+{
+    if (p->buf[0] == '.' && p->buf[1] == 's' &&
+        p->buf[2] == 'n' && p->buf[3] == 'd')
+        return AVPROBE_SCORE_MAX;
+    else
+        return 0;
+}
+
+#define BLOCK_SIZE 1024
+
+static int au_read_header(AVFormatContext *s)
+{
+    int size, data_size = 0;
+    unsigned int tag;
+    AVIOContext *pb = s->pb;
+    unsigned int id, channels, rate;
+    int bps;
+    enum AVCodecID codec;
+    AVStream *st;
+
+    tag = avio_rl32(pb);
+    if (tag != MKTAG('.', 's', 'n', 'd'))
+        return AVERROR_INVALIDDATA;
+    size = avio_rb32(pb); /* header size */
+    data_size = avio_rb32(pb); /* data size in bytes */
+
+    if (data_size < 0 && data_size != AU_UNKNOWN_SIZE) {
+        av_log(s, AV_LOG_ERROR, "Invalid negative data size '%d' found\n", data_size);
+        return AVERROR_INVALIDDATA;
+    }
+
+    id       = avio_rb32(pb);
+    rate     = avio_rb32(pb);
+    channels = avio_rb32(pb);
+
+    if (size > 24) {
+        /* skip unused data */
+        avio_skip(pb, size - 24);
+    }
+
+    codec = ff_codec_get_id(codec_au_tags, id);
+
+    if (codec == AV_CODEC_ID_NONE) {
+        avpriv_request_sample(s, "unknown or unsupported codec tag: %u", id);
+        return AVERROR_PATCHWELCOME;
+    }
+
+    bps = av_get_bits_per_sample(codec);
+    if (!bps) {
+        avpriv_request_sample(s, "Unknown bits per sample");
+        return AVERROR_PATCHWELCOME;
+    }
+
+    if (channels == 0 || channels >= INT_MAX / (BLOCK_SIZE * bps >> 3)) {
+        av_log(s, AV_LOG_ERROR, "Invalid number of channels %u\n", channels);
+        return AVERROR_INVALIDDATA;
+    }
+
+    if (rate == 0 || rate > INT_MAX) {
+        av_log(s, AV_LOG_ERROR, "Invalid sample rate: %u\n", rate);
+        return AVERROR_INVALIDDATA;
+    }
+
+    st = avformat_new_stream(s, NULL);
+    if (!st)
+        return AVERROR(ENOMEM);
+    st->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
+    st->codec->codec_tag   = id;
+    st->codec->codec_id    = codec;
+    st->codec->channels    = channels;
+    st->codec->sample_rate = rate;
+    st->codec->bit_rate    = channels * rate * bps;
+    st->codec->block_align = FFMAX(bps * st->codec->channels / 8, 1);
+    if (data_size != AU_UNKNOWN_SIZE)
+    st->duration = (((int64_t)data_size)<<3) / (st->codec->channels * (int64_t)bps);
+
+    st->start_time = 0;
+    avpriv_set_pts_info(st, 64, 1, rate);
+
+    return 0;
+}
+
+AVInputFormat ff_au_demuxer = {
+    .name        = "au",
+    .long_name   = NULL_IF_CONFIG_SMALL("Sun AU"),
+    .read_probe  = au_probe,
+    .read_header = au_read_header,
+    .read_packet = ff_pcm_read_packet,
+    .read_seek   = ff_pcm_read_seek,
+    .codec_tag   = (const AVCodecTag* const []) { codec_au_tags, 0 },
+};
+
+#endif /* CONFIG_AU_DEMUXER */
+
+#if CONFIG_AU_MUXER
+
+#include "rawenc.h"
+
+static int au_write_header(AVFormatContext *s)
+{
+    AVIOContext *pb = s->pb;
+    AVCodecContext *enc = s->streams[0]->codec;
+
+    if (s->nb_streams != 1) {
+        av_log(s, AV_LOG_ERROR, "only one stream is supported\n");
+        return AVERROR(EINVAL);
+    }
+
+    enc->codec_tag = ff_codec_get_tag(codec_au_tags, enc->codec_id);
+    if (!enc->codec_tag) {
+        av_log(s, AV_LOG_ERROR, "unsupported codec\n");
+        return AVERROR(EINVAL);
+    }
+
+    ffio_wfourcc(pb, ".snd");                   /* magic number */
+    avio_wb32(pb, AU_HEADER_SIZE);              /* header size */
+    avio_wb32(pb, AU_UNKNOWN_SIZE);             /* data size */
+    avio_wb32(pb, enc->codec_tag);              /* codec ID */
+    avio_wb32(pb, enc->sample_rate);
+    avio_wb32(pb, enc->channels);
+    avio_wb64(pb, 0); /* annotation field */
+    avio_flush(pb);
+
+    return 0;
+}
+
+static int au_write_trailer(AVFormatContext *s)
+{
+    AVIOContext *pb = s->pb;
+    int64_t file_size = avio_tell(pb);
+
+    if (s->pb->seekable && file_size < INT32_MAX) {
+        /* update file size */
+        avio_seek(pb, 8, SEEK_SET);
+        avio_wb32(pb, (uint32_t)(file_size - AU_HEADER_SIZE));
+        avio_seek(pb, file_size, SEEK_SET);
+        avio_flush(pb);
+    }
+
+    return 0;
+}
+
+AVOutputFormat ff_au_muxer = {
+    .name          = "au",
+    .long_name     = NULL_IF_CONFIG_SMALL("Sun AU"),
+    .mime_type     = "audio/basic",
+    .extensions    = "au",
+    .audio_codec   = AV_CODEC_ID_PCM_S16BE,
+    .video_codec   = AV_CODEC_ID_NONE,
+    .write_header  = au_write_header,
+    .write_packet  = ff_raw_write_packet,
+    .write_trailer = au_write_trailer,
+    .codec_tag     = (const AVCodecTag* const []) { codec_au_tags, 0 },
+};
+
+#endif /* CONFIG_AU_MUXER */