Motion Pixels MVI Demuxer.

Patch by Gregory Montoir <cyx <at> users <dot> sourceforge <dot> net>

Originally committed as revision 14147 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 135 insertions, 0 deletions

diff --git a/libavformat/mvi.c b/libavformat/mvi.c
new file mode 100644
index 0000000000..03d4a5d6b5
--- /dev/null
+++ b/libavformat/mvi.c
@@ -0,0 +1,135 @@
+/*
+ * Motion Pixels MVI Demuxer
+ * Copyright (c) 2008 Gregory Montoir (cyx@users.sourceforge.net)
+ *
+ * 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 "avformat.h"
+
+#define MVI_FRAC_BITS 10
+
+#define MVI_AUDIO_STREAM_INDEX 0
+#define MVI_VIDEO_STREAM_INDEX 1
+
+typedef struct MviDemuxContext {
+    unsigned int (*get_int)(ByteIOContext *);
+    uint32_t audio_data_size;
+    uint64_t audio_size_counter;
+    uint64_t audio_frame_size;
+    int audio_size_left;
+    int video_frame_size;
+} MviDemuxContext;
+
+static int read_header(AVFormatContext *s, AVFormatParameters *ap)
+{
+    MviDemuxContext *mvi = s->priv_data;
+    ByteIOContext *pb = s->pb;
+    AVStream *ast, *vst;
+    unsigned int version, frames_count, msecs_per_frame, player_version;
+
+    ast = av_new_stream(s, 0);
+    if (!ast)
+        return AVERROR(ENOMEM);
+
+    vst = av_new_stream(s, 0);
+    if (!vst)
+        return AVERROR(ENOMEM);
+
+    vst->codec->extradata_size = 2;
+    vst->codec->extradata = av_mallocz(2 + FF_INPUT_BUFFER_PADDING_SIZE);
+
+    version                  = get_byte(pb);
+    vst->codec->extradata[0] = get_byte(pb);
+    vst->codec->extradata[1] = get_byte(pb);
+    frames_count             = get_le32(pb);
+    msecs_per_frame          = get_le32(pb);
+    vst->codec->width        = get_le16(pb);
+    vst->codec->height       = get_le16(pb);
+    get_byte(pb);
+    ast->codec->sample_rate  = get_le16(pb);
+    mvi->audio_data_size     = get_le32(pb);
+    get_byte(pb);
+    player_version           = get_le32(pb);
+    get_le16(pb);
+    get_byte(pb);
+
+    if (frames_count == 0 || mvi->audio_data_size == 0)
+        return AVERROR_INVALIDDATA;
+
+    if (version != 7 || player_version > 213) {
+        av_log(s, AV_LOG_ERROR, "unhandled version (%d,%d)\n", version, player_version);
+        return AVERROR_INVALIDDATA;
+    }
+
+    av_set_pts_info(ast, 64, 1, ast->codec->sample_rate);
+    ast->codec->codec_type      = CODEC_TYPE_AUDIO;
+    ast->codec->codec_id        = CODEC_ID_PCM_U8;
+    ast->codec->channels        = 1;
+    ast->codec->bits_per_sample = 8;
+    ast->codec->bit_rate        = ast->codec->sample_rate * 8;
+
+    av_set_pts_info(vst, 64, msecs_per_frame, 1000000);
+    vst->codec->codec_type = CODEC_TYPE_VIDEO;
+    vst->codec->codec_id   = CODEC_ID_MOTIONPIXELS;
+    vst->codec->pix_fmt    = PIX_FMT_RGB555;
+
+    mvi->get_int = (vst->codec->width * vst->codec->height < (1 << 16)) ? get_le16 : get_le24;
+
+    mvi->audio_frame_size   = ((uint64_t)mvi->audio_data_size << MVI_FRAC_BITS) / frames_count;
+    mvi->audio_size_counter = (ast->codec->sample_rate * 830 / mvi->audio_frame_size - 1) * mvi->audio_frame_size;
+    mvi->audio_size_left    = mvi->audio_data_size;
+
+    return 0;
+}
+
+static int read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    int ret, count;
+    MviDemuxContext *mvi = s->priv_data;
+    ByteIOContext *pb = s->pb;
+
+    if (mvi->video_frame_size == 0) {
+        mvi->video_frame_size = (mvi->get_int)(pb);
+        if (mvi->audio_size_left == 0)
+            return AVERROR(EIO);
+        count = (mvi->audio_size_counter + mvi->audio_frame_size + 512) >> MVI_FRAC_BITS;
+        if (count > mvi->audio_size_left)
+            count = mvi->audio_size_left;
+        if ((ret = av_get_packet(pb, pkt, count)) < 0)
+            return ret;
+        pkt->stream_index = MVI_AUDIO_STREAM_INDEX;
+        mvi->audio_size_left -= count;
+        mvi->audio_size_counter += mvi->audio_frame_size - (count << MVI_FRAC_BITS);
+    } else {
+        if ((ret = av_get_packet(pb, pkt, mvi->video_frame_size)) < 0)
+            return ret;
+        pkt->stream_index = MVI_VIDEO_STREAM_INDEX;
+        mvi->video_frame_size = 0;
+    }
+    return 0;
+}
+
+AVInputFormat mvi_demuxer = {
+    "mvi",
+    NULL_IF_CONFIG_SMALL("Motion Pixels MVI format"),
+    sizeof(MviDemuxContext),
+    NULL,
+    read_header,
+    read_packet,
+    .extensions = "mvi"
+};