making act segmenter

1 files changed, 182 insertions, 0 deletions

diff --git a/ffmpeg/libavformat/amr.c b/ffmpeg/libavformat/amr.c
new file mode 100644
index 0000000..07ab1ba
--- /dev/null
+++ b/ffmpeg/libavformat/amr.c
@@ -0,0 +1,182 @@
+/*
+ * amr file format
+ * Copyright (c) 2001 ffmpeg project
+ *
+ * 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
+ */
+
+/*
+Write and read amr data according to RFC3267, http://www.ietf.org/rfc/rfc3267.txt?number=3267
+
+Only mono files are supported.
+
+*/
+
+#include "libavutil/avassert.h"
+#include "libavutil/channel_layout.h"
+#include "avformat.h"
+#include "internal.h"
+
+static const char AMR_header[]   = "#!AMR\n";
+static const char AMRWB_header[] = "#!AMR-WB\n";
+
+#if CONFIG_AMR_MUXER
+static int amr_write_header(AVFormatContext *s)
+{
+    AVIOContext    *pb  = s->pb;
+    AVCodecContext *enc = s->streams[0]->codec;
+
+    s->priv_data = NULL;
+
+    if (enc->codec_id == AV_CODEC_ID_AMR_NB) {
+        avio_write(pb, AMR_header,   sizeof(AMR_header)   - 1); /* magic number */
+    } else if (enc->codec_id == AV_CODEC_ID_AMR_WB) {
+        avio_write(pb, AMRWB_header, sizeof(AMRWB_header) - 1); /* magic number */
+    } else {
+        return -1;
+    }
+    avio_flush(pb);
+    return 0;
+}
+
+static int amr_write_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    avio_write(s->pb, pkt->data, pkt->size);
+    avio_flush(s->pb);
+    return 0;
+}
+#endif /* CONFIG_AMR_MUXER */
+
+static int amr_probe(AVProbeData *p)
+{
+    // Only check for "#!AMR" which could be amr-wb, amr-nb.
+    // This will also trigger multichannel files: "#!AMR_MC1.0\n" and
+    // "#!AMR-WB_MC1.0\n" (not supported)
+
+    if (!memcmp(p->buf, AMR_header, 5))
+        return AVPROBE_SCORE_MAX;
+    else
+        return 0;
+}
+
+/* amr input */
+static int amr_read_header(AVFormatContext *s)
+{
+    AVIOContext *pb = s->pb;
+    AVStream *st;
+    uint8_t header[9];
+
+    avio_read(pb, header, 6);
+
+    st = avformat_new_stream(s, NULL);
+    if (!st)
+        return AVERROR(ENOMEM);
+    if (memcmp(header, AMR_header, 6)) {
+        avio_read(pb, header + 6, 3);
+        if (memcmp(header, AMRWB_header, 9)) {
+            return -1;
+        }
+
+        st->codec->codec_tag   = MKTAG('s', 'a', 'w', 'b');
+        st->codec->codec_id    = AV_CODEC_ID_AMR_WB;
+        st->codec->sample_rate = 16000;
+    } else {
+        st->codec->codec_tag   = MKTAG('s', 'a', 'm', 'r');
+        st->codec->codec_id    = AV_CODEC_ID_AMR_NB;
+        st->codec->sample_rate = 8000;
+    }
+    st->codec->channels   = 1;
+    st->codec->channel_layout = AV_CH_LAYOUT_MONO;
+    st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
+    avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
+
+    return 0;
+}
+
+static int amr_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    AVCodecContext *enc = s->streams[0]->codec;
+    int read, size = 0, toc, mode;
+    int64_t pos = avio_tell(s->pb);
+
+    if (url_feof(s->pb)) {
+        return AVERROR(EIO);
+    }
+
+    // FIXME this is wrong, this should rather be in a AVParset
+    toc  = avio_r8(s->pb);
+    mode = (toc >> 3) & 0x0F;
+
+    if (enc->codec_id == AV_CODEC_ID_AMR_NB) {
+        static const uint8_t packed_size[16] = {
+            12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0
+        };
+
+        size = packed_size[mode] + 1;
+    } else if (enc->codec_id == AV_CODEC_ID_AMR_WB) {
+        static const uint8_t packed_size[16] = {
+            18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1
+        };
+
+        size = packed_size[mode];
+    } else {
+        av_assert0(0);
+    }
+
+    if (!size || av_new_packet(pkt, size))
+        return AVERROR(EIO);
+
+    /* Both AMR formats have 50 frames per second */
+    s->streams[0]->codec->bit_rate = size*8*50;
+
+    pkt->stream_index = 0;
+    pkt->pos          = pos;
+    pkt->data[0]      = toc;
+    pkt->duration     = enc->codec_id == AV_CODEC_ID_AMR_NB ? 160 : 320;
+    read              = avio_read(s->pb, pkt->data + 1, size - 1);
+
+    if (read != size - 1) {
+        av_free_packet(pkt);
+        return AVERROR(EIO);
+    }
+
+    return 0;
+}
+
+#if CONFIG_AMR_DEMUXER
+AVInputFormat ff_amr_demuxer = {
+    .name           = "amr",
+    .long_name      = NULL_IF_CONFIG_SMALL("3GPP AMR"),
+    .read_probe     = amr_probe,
+    .read_header    = amr_read_header,
+    .read_packet    = amr_read_packet,
+    .flags          = AVFMT_GENERIC_INDEX,
+};
+#endif
+
+#if CONFIG_AMR_MUXER
+AVOutputFormat ff_amr_muxer = {
+    .name              = "amr",
+    .long_name         = NULL_IF_CONFIG_SMALL("3GPP AMR"),
+    .mime_type         = "audio/amr",
+    .extensions        = "amr",
+    .audio_codec       = AV_CODEC_ID_AMR_NB,
+    .video_codec       = AV_CODEC_ID_NONE,
+    .write_header      = amr_write_header,
+    .write_packet      = amr_write_packet,
+};
+#endif