making act segmenter

1 files changed, 203 insertions, 0 deletions

diff --git a/ffmpeg/libavformat/mtv.c b/ffmpeg/libavformat/mtv.c
new file mode 100644
index 0000000..6ffbb51
--- /dev/null
+++ b/ffmpeg/libavformat/mtv.c
@@ -0,0 +1,203 @@
+/*
+ * mtv demuxer
+ * Copyright (c) 2006 Reynaldo H. Verdejo Pinochet
+ *
+ * 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
+ */
+
+/**
+ * @file
+ * MTV demuxer.
+ */
+
+#include "libavutil/bswap.h"
+#include "libavutil/intreadwrite.h"
+#include "avformat.h"
+#include "internal.h"
+
+#define MTV_ASUBCHUNK_DATA_SIZE 500
+#define MTV_HEADER_SIZE 512
+#define MTV_AUDIO_PADDING_SIZE 12
+#define AUDIO_SAMPLING_RATE 44100
+
+typedef struct MTVDemuxContext {
+
+    unsigned int file_size;         ///< filesize, not always right
+    unsigned int segments;          ///< number of 512 byte segments
+    unsigned int audio_identifier;  ///< 'MP3' on all files I have seen
+    unsigned int audio_br;          ///< bitrate of audio channel (mp3)
+    unsigned int img_colorfmt;      ///< frame colorfmt rgb 565/555
+    unsigned int img_bpp;           ///< frame bits per pixel
+    unsigned int img_width;         //
+    unsigned int img_height;        //
+    unsigned int img_segment_size;  ///< size of image segment
+    unsigned int video_fps;         //
+    unsigned int full_segment_size;
+
+} MTVDemuxContext;
+
+static int mtv_probe(AVProbeData *p)
+{
+    /* Magic is 'AMV' */
+    if (*p->buf != 'A' || *(p->buf + 1) != 'M' || *(p->buf + 2) != 'V')
+        return 0;
+
+    /* Check for nonzero in bpp and (width|height) header fields */
+    if(p->buf_size < 57 || !(p->buf[51] && AV_RL16(&p->buf[52]) | AV_RL16(&p->buf[54])))
+        return 0;
+
+    /* If width or height are 0 then imagesize header field should not */
+    if(!AV_RL16(&p->buf[52]) || !AV_RL16(&p->buf[54]))
+    {
+        if(!!AV_RL16(&p->buf[56]))
+            return AVPROBE_SCORE_MAX/2;
+        else
+            return 0;
+    }
+
+    if(p->buf[51] != 16)
+        return AVPROBE_SCORE_MAX/4; // But we are going to assume 16bpp anyway ..
+
+    return AVPROBE_SCORE_MAX;
+}
+
+static int mtv_read_header(AVFormatContext *s)
+{
+    MTVDemuxContext *mtv = s->priv_data;
+    AVIOContext   *pb  = s->pb;
+    AVStream        *st;
+    unsigned int    audio_subsegments;
+
+    avio_skip(pb, 3);
+    mtv->file_size         = avio_rl32(pb);
+    mtv->segments          = avio_rl32(pb);
+    avio_skip(pb, 32);
+    mtv->audio_identifier  = avio_rl24(pb);
+    mtv->audio_br          = avio_rl16(pb);
+    mtv->img_colorfmt      = avio_rl24(pb);
+    mtv->img_bpp           = avio_r8(pb);
+    mtv->img_width         = avio_rl16(pb);
+    mtv->img_height        = avio_rl16(pb);
+    mtv->img_segment_size  = avio_rl16(pb);
+
+    /* Calculate width and height if missing from header */
+
+    if(mtv->img_bpp>>3){
+    if(!mtv->img_width && mtv->img_height)
+        mtv->img_width=mtv->img_segment_size / (mtv->img_bpp>>3)
+                        / mtv->img_height;
+
+    if(!mtv->img_height && mtv->img_width)
+        mtv->img_height=mtv->img_segment_size / (mtv->img_bpp>>3)
+                        / mtv->img_width;
+    }
+    if(!mtv->img_height || !mtv->img_width){
+        av_log(s, AV_LOG_ERROR, "width or height is invalid and I cannot calculate them from other information\n");
+        return AVERROR(EINVAL);
+    }
+
+    avio_skip(pb, 4);
+    audio_subsegments = avio_rl16(pb);
+
+    if (audio_subsegments == 0) {
+        avpriv_request_sample(s, "MTV files without audio");
+        return AVERROR_PATCHWELCOME;
+    }
+
+    mtv->full_segment_size =
+        audio_subsegments * (MTV_AUDIO_PADDING_SIZE + MTV_ASUBCHUNK_DATA_SIZE) +
+        mtv->img_segment_size;
+    mtv->video_fps         = (mtv->audio_br / 4) / audio_subsegments;
+
+    // FIXME Add sanity check here
+
+    // all systems go! init decoders
+
+    // video - raw rgb565
+
+    st = avformat_new_stream(s, NULL);
+    if(!st)
+        return AVERROR(ENOMEM);
+
+    avpriv_set_pts_info(st, 64, 1, mtv->video_fps);
+    st->codec->codec_type      = AVMEDIA_TYPE_VIDEO;
+    st->codec->codec_id        = AV_CODEC_ID_RAWVIDEO;
+    st->codec->pix_fmt         = AV_PIX_FMT_RGB565BE;
+    st->codec->width           = mtv->img_width;
+    st->codec->height          = mtv->img_height;
+    st->codec->sample_rate     = mtv->video_fps;
+    st->codec->extradata       = av_strdup("BottomUp");
+    st->codec->extradata_size  = 9;
+
+    // audio - mp3
+
+    st = avformat_new_stream(s, NULL);
+    if(!st)
+        return AVERROR(ENOMEM);
+
+    avpriv_set_pts_info(st, 64, 1, AUDIO_SAMPLING_RATE);
+    st->codec->codec_type      = AVMEDIA_TYPE_AUDIO;
+    st->codec->codec_id        = AV_CODEC_ID_MP3;
+    st->codec->bit_rate        = mtv->audio_br;
+    st->need_parsing           = AVSTREAM_PARSE_FULL;
+
+    // Jump over header
+
+    if(avio_seek(pb, MTV_HEADER_SIZE, SEEK_SET) != MTV_HEADER_SIZE)
+        return AVERROR(EIO);
+
+    return 0;
+
+}
+
+static int mtv_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    MTVDemuxContext *mtv = s->priv_data;
+    AVIOContext *pb = s->pb;
+    int ret;
+
+    if((avio_tell(pb) - s->data_offset + mtv->img_segment_size) % mtv->full_segment_size)
+    {
+        avio_skip(pb, MTV_AUDIO_PADDING_SIZE);
+
+        ret = av_get_packet(pb, pkt, MTV_ASUBCHUNK_DATA_SIZE);
+        if(ret < 0)
+            return ret;
+
+        pkt->pos -= MTV_AUDIO_PADDING_SIZE;
+        pkt->stream_index = 1;
+
+    }else
+    {
+        ret = av_get_packet(pb, pkt, mtv->img_segment_size);
+        if(ret < 0)
+            return ret;
+
+        pkt->stream_index = 0;
+    }
+
+    return ret;
+}
+
+AVInputFormat ff_mtv_demuxer = {
+    .name           = "mtv",
+    .long_name      = NULL_IF_CONFIG_SMALL("MTV"),
+    .priv_data_size = sizeof(MTVDemuxContext),
+    .read_probe     = mtv_probe,
+    .read_header    = mtv_read_header,
+    .read_packet    = mtv_read_packet,
+};