making act segmenter

1 files changed, 231 insertions, 0 deletions

diff --git a/ffmpeg/libavformat/cdxl.c b/ffmpeg/libavformat/cdxl.c
new file mode 100644
index 0000000..185b745
--- /dev/null
+++ b/ffmpeg/libavformat/cdxl.c
@@ -0,0 +1,231 @@
+/*
+ * CDXL demuxer
+ * Copyright (c) 2011-2012 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/channel_layout.h"
+#include "libavutil/intreadwrite.h"
+#include "libavutil/parseutils.h"
+#include "libavutil/opt.h"
+#include "avformat.h"
+#include "internal.h"
+
+#define CDXL_HEADER_SIZE 32
+
+typedef struct CDXLDemuxContext {
+    AVClass     *class;
+    int         sample_rate;
+    char        *framerate;
+    AVRational  fps;
+    int         read_chunk;
+    uint8_t     header[CDXL_HEADER_SIZE];
+    int         video_stream_index;
+    int         audio_stream_index;
+} CDXLDemuxContext;
+
+static int cdxl_read_probe(AVProbeData *p)
+{
+    int score = AVPROBE_SCORE_MAX / 2 + 10;
+
+    if (p->buf_size < CDXL_HEADER_SIZE)
+        return 0;
+
+    /* reserved bytes should always be set to 0 */
+    if (AV_RN64(&p->buf[24]) || AV_RN16(&p->buf[10]))
+        return 0;
+
+    /* check type */
+    if (p->buf[0] != 1)
+        return 0;
+
+    /* check palette size */
+    if (AV_RB16(&p->buf[20]) > 512)
+        return 0;
+
+    /* check number of planes */
+    if (p->buf[18] || !p->buf[19])
+        return 0;
+
+    /* check widh and height */
+    if (!AV_RN16(&p->buf[14]) || !AV_RN16(&p->buf[16]))
+        return 0;
+
+    /* chunk size */
+    if (AV_RB32(&p->buf[2]) < AV_RB16(&p->buf[22]) + AV_RB16(&p->buf[20]) + CDXL_HEADER_SIZE)
+        return 0;
+
+    /* previous chunk size */
+    if (AV_RN32(&p->buf[6]))
+        score /= 2;
+
+    /* current frame number, usually starts from 1 */
+    if (AV_RB16(&p->buf[12]) != 1)
+        score /= 2;
+
+    return score;
+}
+
+static int cdxl_read_header(AVFormatContext *s)
+{
+    CDXLDemuxContext *cdxl = s->priv_data;
+    int ret;
+
+    if (cdxl->framerate && (ret = av_parse_video_rate(&cdxl->fps, cdxl->framerate)) < 0) {
+        av_log(s, AV_LOG_ERROR,
+               "Could not parse framerate: %s.\n", cdxl->framerate);
+        return ret;
+    }
+
+    cdxl->read_chunk         =  0;
+    cdxl->video_stream_index = -1;
+    cdxl->audio_stream_index = -1;
+
+    s->ctx_flags |= AVFMTCTX_NOHEADER;
+
+    return 0;
+}
+
+static int cdxl_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    CDXLDemuxContext *cdxl = s->priv_data;
+    AVIOContext *pb = s->pb;
+    uint32_t current_size, video_size, image_size;
+    uint16_t audio_size, palette_size, width, height;
+    int64_t  pos;
+    int      ret;
+
+    if (url_feof(pb))
+        return AVERROR_EOF;
+
+    pos = avio_tell(pb);
+    if (!cdxl->read_chunk &&
+        avio_read(pb, cdxl->header, CDXL_HEADER_SIZE) != CDXL_HEADER_SIZE)
+        return AVERROR_EOF;
+    if (cdxl->header[0] != 1) {
+        av_log(s, AV_LOG_ERROR, "non-standard cdxl file\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    current_size = AV_RB32(&cdxl->header[2]);
+    width        = AV_RB16(&cdxl->header[14]);
+    height       = AV_RB16(&cdxl->header[16]);
+    palette_size = AV_RB16(&cdxl->header[20]);
+    audio_size   = AV_RB16(&cdxl->header[22]);
+    image_size   = FFALIGN(width, 16) * height * cdxl->header[19] / 8;
+    video_size   = palette_size + image_size;
+
+    if (palette_size > 512)
+        return AVERROR_INVALIDDATA;
+    if (current_size < (uint64_t)audio_size + video_size + CDXL_HEADER_SIZE)
+        return AVERROR_INVALIDDATA;
+
+    if (cdxl->read_chunk && audio_size) {
+        if (cdxl->audio_stream_index == -1) {
+            AVStream *st = avformat_new_stream(s, NULL);
+            if (!st)
+                return AVERROR(ENOMEM);
+
+            st->codec->codec_type    = AVMEDIA_TYPE_AUDIO;
+            st->codec->codec_tag     = 0;
+            st->codec->codec_id      = AV_CODEC_ID_PCM_S8;
+            if (cdxl->header[1] & 0x10) {
+                st->codec->channels       = 2;
+                st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
+            } else {
+                st->codec->channels       = 1;
+                st->codec->channel_layout = AV_CH_LAYOUT_MONO;
+            }
+            st->codec->sample_rate   = cdxl->sample_rate;
+            st->start_time           = 0;
+            cdxl->audio_stream_index = st->index;
+            avpriv_set_pts_info(st, 64, 1, cdxl->sample_rate);
+        }
+
+        ret = av_get_packet(pb, pkt, audio_size);
+        if (ret < 0)
+            return ret;
+        pkt->stream_index = cdxl->audio_stream_index;
+        pkt->pos          = pos;
+        pkt->duration     = audio_size;
+        cdxl->read_chunk  = 0;
+    } else {
+        if (cdxl->video_stream_index == -1) {
+            AVStream *st = avformat_new_stream(s, NULL);
+            if (!st)
+                return AVERROR(ENOMEM);
+
+            st->codec->codec_type    = AVMEDIA_TYPE_VIDEO;
+            st->codec->codec_tag     = 0;
+            st->codec->codec_id      = AV_CODEC_ID_CDXL;
+            st->codec->width         = width;
+            st->codec->height        = height;
+            st->start_time           = 0;
+            cdxl->video_stream_index = st->index;
+            if (cdxl->framerate)
+                avpriv_set_pts_info(st, 64, cdxl->fps.den, cdxl->fps.num);
+            else
+                avpriv_set_pts_info(st, 64, 1, cdxl->sample_rate);
+        }
+
+        if (av_new_packet(pkt, video_size + CDXL_HEADER_SIZE) < 0)
+            return AVERROR(ENOMEM);
+        memcpy(pkt->data, cdxl->header, CDXL_HEADER_SIZE);
+        ret = avio_read(pb, pkt->data + CDXL_HEADER_SIZE, video_size);
+        if (ret < 0) {
+            av_free_packet(pkt);
+            return ret;
+        }
+        av_shrink_packet(pkt, CDXL_HEADER_SIZE + ret);
+        pkt->stream_index  = cdxl->video_stream_index;
+        pkt->flags        |= AV_PKT_FLAG_KEY;
+        pkt->pos           = pos;
+        pkt->duration      = cdxl->framerate ? 1 : audio_size ? audio_size : 220;
+        cdxl->read_chunk   = audio_size;
+    }
+
+    if (!cdxl->read_chunk)
+        avio_skip(pb, current_size - audio_size - video_size - CDXL_HEADER_SIZE);
+    return ret;
+}
+
+#define OFFSET(x) offsetof(CDXLDemuxContext, x)
+static const AVOption cdxl_options[] = {
+    { "sample_rate", "", OFFSET(sample_rate), AV_OPT_TYPE_INT,    { .i64 = 11025 }, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
+    { "framerate",   "", OFFSET(framerate),   AV_OPT_TYPE_STRING, { .str = NULL },  0, 0,       AV_OPT_FLAG_DECODING_PARAM },
+    { NULL },
+};
+
+static const AVClass cdxl_demuxer_class = {
+    .class_name = "CDXL demuxer",
+    .item_name  = av_default_item_name,
+    .option     = cdxl_options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
+AVInputFormat ff_cdxl_demuxer = {
+    .name           = "cdxl",
+    .long_name      = NULL_IF_CONFIG_SMALL("Commodore CDXL video"),
+    .priv_data_size = sizeof(CDXLDemuxContext),
+    .read_probe     = cdxl_read_probe,
+    .read_header    = cdxl_read_header,
+    .read_packet    = cdxl_read_packet,
+    .extensions     = "cdxl,xl",
+    .flags          = AVFMT_GENERIC_INDEX,
+    .priv_class     = &cdxl_demuxer_class,
+};