initial commit for Sierra VMD file demuxer

Originally committed as revision 2653 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 263 insertions, 0 deletions

diff --git a/libavformat/sierravmd.c b/libavformat/sierravmd.c
new file mode 100644
index 0000000000..d0525b95c2
--- /dev/null
+++ b/libavformat/sierravmd.c
@@ -0,0 +1,263 @@
+/*
+ * Sierra VMD Format Demuxer
+ * Copyright (c) 2004 The ffmpeg Project
+ *
+ * This library 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 of the License, or (at your option) any later version.
+ *
+ * This library 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 this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+/**
+ * @file sierravmd.c
+ * Sierra VMD file demuxer
+ * by Vladimir "VAG" Gneushev (vagsoft at mail.ru)
+ */
+
+#include "avformat.h"
+
+#define LE_16(x)  ((((uint8_t*)(x))[1] << 8) | ((uint8_t*)(x))[0])
+#define LE_32(x)  ((((uint8_t*)(x))[3] << 24) | \
+                   (((uint8_t*)(x))[2] << 16) | \
+                   (((uint8_t*)(x))[1] << 8) | \
+                    ((uint8_t*)(x))[0])
+
+#define VMD_HEADER_SIZE 0x0330
+#define BYTES_PER_FRAME_RECORD 16
+
+typedef struct {
+  int stream_index;
+  offset_t frame_offset;
+  unsigned int frame_size;
+  int64_t pts;
+  int keyframe;
+  unsigned char frame_record[BYTES_PER_FRAME_RECORD];
+} vmd_frame_t;
+
+typedef struct VmdDemuxContext {
+    int video_stream_index;
+    int audio_stream_index;
+
+    unsigned int audio_type;
+    unsigned int audio_samplerate;
+    unsigned int audio_bits;
+    unsigned int audio_channels;
+
+    unsigned int frame_count;
+    vmd_frame_t *frame_table;
+    unsigned int current_frame;
+
+    unsigned char vmd_header[VMD_HEADER_SIZE];
+} VmdDemuxContext;
+
+static int vmd_probe(AVProbeData *p)
+{
+    if (p->buf_size < 2)
+        return 0;
+
+    /* check if the first 2 bytes of the file contain the appropriate size
+     * of a VMD header chunk */
+    if (LE_16(&p->buf[0]) != VMD_HEADER_SIZE - 2)
+        return 0;
+
+    /* only return half certainty since this check is a bit sketchy */
+    return AVPROBE_SCORE_MAX / 2;
+}
+
+static int vmd_read_header(AVFormatContext *s,
+                           AVFormatParameters *ap)
+{
+    VmdDemuxContext *vmd = (VmdDemuxContext *)s->priv_data;
+    ByteIOContext *pb = &s->pb;
+    AVStream *st;
+    unsigned int toc_offset;
+    unsigned char *raw_frame_table;
+    int raw_frame_table_size;
+    unsigned char *current_frame_record;
+    offset_t current_offset;
+    int i;
+    int sample_rate;
+    unsigned int total_frames;
+int video_frame_count = 0;
+
+    /* fetch the main header, including the 2 header length bytes */
+    url_fseek(pb, 0, SEEK_SET);
+    if (get_buffer(pb, vmd->vmd_header, VMD_HEADER_SIZE) != VMD_HEADER_SIZE)
+        return -EIO;
+
+    /* start up the decoders */
+    st = av_new_stream(s, 0);
+    if (!st)
+        return AVERROR_NOMEM;
+    vmd->video_stream_index = st->index;
+    st->codec.codec_type = CODEC_TYPE_VIDEO;
+    st->codec.codec_id = CODEC_ID_VMDVIDEO;
+    st->codec.codec_tag = 0;  /* no fourcc */
+    st->codec.width = LE_16(&vmd->vmd_header[12]);
+    st->codec.height = LE_16(&vmd->vmd_header[14]);
+    st->codec.extradata_size = VMD_HEADER_SIZE;
+    st->codec.extradata = av_malloc(VMD_HEADER_SIZE);
+    memcpy(st->codec.extradata, vmd->vmd_header, VMD_HEADER_SIZE);
+
+    /* if sample rate is 0, assume no audio */
+    sample_rate = LE_16(&vmd->vmd_header[804]);
+    if (sample_rate) {
+        st = av_new_stream(s, 0);
+        if (!st)
+            return AVERROR_NOMEM;
+        vmd->audio_stream_index = st->index;
+        st->codec.codec_type = CODEC_TYPE_AUDIO;
+        st->codec.codec_id = CODEC_ID_VMDAUDIO;
+        st->codec.codec_tag = 0;  /* no codec tag */
+        st->codec.channels = (vmd->vmd_header[811] & 0x80) ? 2 : 1;
+        st->codec.sample_rate = sample_rate;
+        st->codec.bit_rate = st->codec.sample_rate * 
+            st->codec.bits_per_sample * st->codec.channels;
+        st->codec.block_align = LE_16(&vmd->vmd_header[806]);
+        if (st->codec.block_align & 0x8000) {
+            st->codec.bits_per_sample = 16;
+            st->codec.block_align = -(st->codec.block_align - 0x10000);
+        } else
+            st->codec.bits_per_sample = 8;
+    }
+
+    /* skip over the offset table and load the table of contents; don't 
+     * care about the offset table since demuxer will calculate those 
+     * independently */
+    toc_offset = LE_32(&vmd->vmd_header[812]);
+    vmd->frame_count = LE_16(&vmd->vmd_header[6]);
+    url_fseek(pb, toc_offset + vmd->frame_count * 6, SEEK_SET);
+
+    /* each on-disk VMD frame has an audio part and a video part; demuxer
+     * accounts them separately */
+    vmd->frame_count *= 2;
+    raw_frame_table = NULL;
+    vmd->frame_table = NULL;
+    raw_frame_table_size = vmd->frame_count * BYTES_PER_FRAME_RECORD;
+    raw_frame_table = av_malloc(raw_frame_table_size);
+    vmd->frame_table = av_malloc(vmd->frame_count * sizeof(vmd_frame_t));
+    if (!raw_frame_table || !vmd->frame_table) {
+        av_free(raw_frame_table);
+        av_free(vmd->frame_table);
+        return AVERROR_NOMEM;
+    }
+    if (get_buffer(pb, raw_frame_table, raw_frame_table_size) != 
+        raw_frame_table_size) {
+        av_free(raw_frame_table);
+        av_free(vmd->frame_table);
+        return -EIO;
+    }
+
+    current_offset = LE_32(&vmd->vmd_header[20]);
+    current_frame_record = raw_frame_table;
+    total_frames = vmd->frame_count;
+    i = 0;
+    while (total_frames--) {
+
+        /* if the frame size is 0, do not count the frame and bring the
+         * total frame count down */
+        vmd->frame_table[i].frame_size = LE_32(&current_frame_record[2]);
+
+        /* this logic is present so that 0-length audio chunks are not
+         * accounted */
+        if (!vmd->frame_table[i].frame_size) {
+            vmd->frame_count--;  /* one less frame to count */
+            current_frame_record += BYTES_PER_FRAME_RECORD;
+            continue;
+        }
+
+        if (current_frame_record[0] == 0x02)
+            vmd->frame_table[i].stream_index = vmd->video_stream_index;
+        else
+            vmd->frame_table[i].stream_index = vmd->audio_stream_index;
+        vmd->frame_table[i].frame_offset = current_offset;
+        current_offset += vmd->frame_table[i].frame_size;
+        memcpy(vmd->frame_table[i].frame_record, current_frame_record,
+            BYTES_PER_FRAME_RECORD);
+
+if (current_frame_record[0] == 0x02) {
+  /* assume 15 fps for now */
+  vmd->frame_table[i].pts = video_frame_count++;
+  vmd->frame_table[i].pts *= 90000;
+  vmd->frame_table[i].pts /= 15;
+}
+
+        current_frame_record += BYTES_PER_FRAME_RECORD;
+        i++;
+    }
+
+    av_free(raw_frame_table);
+
+    /* set the pts reference at 1 pts = 1/90000 sec */
+    s->pts_num = 1;
+    s->pts_den = 90000;
+
+    vmd->current_frame = 0;
+
+    return 0;
+}
+
+static int vmd_read_packet(AVFormatContext *s,
+                           AVPacket *pkt)
+{
+    VmdDemuxContext *vmd = (VmdDemuxContext *)s->priv_data;
+    ByteIOContext *pb = &s->pb;
+    int ret = 0;
+    vmd_frame_t *frame;
+
+    if (vmd->current_frame >= vmd->frame_count)
+        return -EIO;
+
+    frame = &vmd->frame_table[vmd->current_frame];
+    /* position the stream (will probably be there already) */
+    url_fseek(pb, frame->frame_offset, SEEK_SET);
+
+    if (av_new_packet(pkt, frame->frame_size + BYTES_PER_FRAME_RECORD))
+        return AVERROR_NOMEM;
+    memcpy(pkt->data, frame->frame_record, BYTES_PER_FRAME_RECORD);
+    ret = get_buffer(pb, pkt->data + BYTES_PER_FRAME_RECORD, 
+        frame->frame_size);
+
+    if (ret != frame->frame_size)
+        ret = -EIO;
+    pkt->stream_index = frame->stream_index;
+    pkt->pts = frame->pts;
+
+    vmd->current_frame++;
+
+    return ret;
+}
+
+static int vmd_read_close(AVFormatContext *s)
+{
+    VmdDemuxContext *vmd = (VmdDemuxContext *)s->priv_data;
+
+    av_free(vmd->frame_table);
+
+    return 0;
+}
+
+static AVInputFormat vmd_iformat = {
+    "vmd",
+    "Sierra VMD format",
+    sizeof(VmdDemuxContext),
+    vmd_probe,
+    vmd_read_header,
+    vmd_read_packet,
+    vmd_read_close,
+};
+
+int vmd_init(void)
+{
+    av_register_input_format(&vmd_iformat);
+    return 0;
+}