making act segmenter

1 files changed, 301 insertions, 0 deletions

diff --git a/ffmpeg/libavformat/sierravmd.c b/ffmpeg/libavformat/sierravmd.c
new file mode 100644
index 0000000..b0b582d
--- /dev/null
+++ b/ffmpeg/libavformat/sierravmd.c
@@ -0,0 +1,301 @@
+/*
+ * Sierra VMD Format Demuxer
+ * Copyright (c) 2004 The 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
+ */
+
+/**
+ * @file
+ * Sierra VMD file demuxer
+ * by Vladimir "VAG" Gneushev (vagsoft at mail.ru)
+ * for more information on the Sierra VMD file format, visit:
+ *   http://www.pcisys.net/~melanson/codecs/
+ */
+
+#include "libavutil/channel_layout.h"
+#include "libavutil/intreadwrite.h"
+#include "avformat.h"
+#include "internal.h"
+#include "avio_internal.h"
+
+#define VMD_HEADER_SIZE 0x0330
+#define BYTES_PER_FRAME_RECORD 16
+
+typedef struct {
+  int stream_index;
+  int64_t frame_offset;
+  unsigned int frame_size;
+  int64_t pts;
+  int keyframe;
+  unsigned char frame_record[BYTES_PER_FRAME_RECORD];
+} vmd_frame;
+
+typedef struct VmdDemuxContext {
+    int video_stream_index;
+    int audio_stream_index;
+
+    unsigned int frame_count;
+    unsigned int frames_per_block;
+    vmd_frame *frame_table;
+    unsigned int current_frame;
+    int is_indeo3;
+
+    int sample_rate;
+    int64_t audio_sample_counter;
+    int skiphdr;
+
+    unsigned char vmd_header[VMD_HEADER_SIZE];
+} VmdDemuxContext;
+
+static int vmd_probe(AVProbeData *p)
+{
+    int w, h;
+    if (p->buf_size < 16)
+        return 0;
+    /* check if the first 2 bytes of the file contain the appropriate size
+     * of a VMD header chunk */
+    if (AV_RL16(&p->buf[0]) != VMD_HEADER_SIZE - 2)
+        return 0;
+    w = AV_RL16(&p->buf[12]);
+    h = AV_RL16(&p->buf[14]);
+    if (!w || w > 2048 || !h || h > 2048)
+        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)
+{
+    VmdDemuxContext *vmd = s->priv_data;
+    AVIOContext *pb = s->pb;
+    AVStream *st = NULL, *vst;
+    unsigned int toc_offset;
+    unsigned char *raw_frame_table;
+    int raw_frame_table_size;
+    int64_t current_offset;
+    int i, j;
+    unsigned int total_frames;
+    int64_t current_audio_pts = 0;
+    unsigned char chunk[BYTES_PER_FRAME_RECORD];
+    int num, den;
+    int sound_buffers;
+
+    /* fetch the main header, including the 2 header length bytes */
+    avio_seek(pb, 0, SEEK_SET);
+    if (avio_read(pb, vmd->vmd_header, VMD_HEADER_SIZE) != VMD_HEADER_SIZE)
+        return AVERROR(EIO);
+
+    if(vmd->vmd_header[24] == 'i' && vmd->vmd_header[25] == 'v' && vmd->vmd_header[26] == '3')
+        vmd->is_indeo3 = 1;
+    else
+        vmd->is_indeo3 = 0;
+    /* start up the decoders */
+    vst = avformat_new_stream(s, NULL);
+    if (!vst)
+        return AVERROR(ENOMEM);
+    avpriv_set_pts_info(vst, 33, 1, 10);
+    vmd->video_stream_index = vst->index;
+    vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
+    vst->codec->codec_id = vmd->is_indeo3 ? AV_CODEC_ID_INDEO3 : AV_CODEC_ID_VMDVIDEO;
+    vst->codec->codec_tag = 0;  /* no fourcc */
+    vst->codec->width = AV_RL16(&vmd->vmd_header[12]);
+    vst->codec->height = AV_RL16(&vmd->vmd_header[14]);
+    if(vmd->is_indeo3 && vst->codec->width > 320){
+        vst->codec->width >>= 1;
+        vst->codec->height >>= 1;
+    }
+    vst->codec->extradata_size = VMD_HEADER_SIZE;
+    vst->codec->extradata = av_mallocz(VMD_HEADER_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
+    memcpy(vst->codec->extradata, vmd->vmd_header, VMD_HEADER_SIZE);
+
+    /* if sample rate is 0, assume no audio */
+    vmd->sample_rate = AV_RL16(&vmd->vmd_header[804]);
+    if (vmd->sample_rate) {
+        st = avformat_new_stream(s, NULL);
+        if (!st)
+            return AVERROR(ENOMEM);
+        vmd->audio_stream_index = st->index;
+        st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
+        st->codec->codec_id = AV_CODEC_ID_VMDAUDIO;
+        st->codec->codec_tag = 0;  /* no fourcc */
+        if (vmd->vmd_header[811] & 0x80) {
+            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 = vmd->sample_rate;
+        st->codec->block_align = AV_RL16(&vmd->vmd_header[806]);
+        if (st->codec->block_align & 0x8000) {
+            st->codec->bits_per_coded_sample = 16;
+            st->codec->block_align = -(st->codec->block_align - 0x10000);
+        } else {
+            st->codec->bits_per_coded_sample = 8;
+        }
+        st->codec->bit_rate = st->codec->sample_rate *
+            st->codec->bits_per_coded_sample * st->codec->channels;
+
+        /* calculate pts */
+        num = st->codec->block_align;
+        den = st->codec->sample_rate * st->codec->channels;
+        av_reduce(&num, &den, num, den, (1UL<<31)-1);
+        avpriv_set_pts_info(vst, 33, num, den);
+        avpriv_set_pts_info(st, 33, num, den);
+    }
+
+    toc_offset = AV_RL32(&vmd->vmd_header[812]);
+    vmd->frame_count = AV_RL16(&vmd->vmd_header[6]);
+    vmd->frames_per_block = AV_RL16(&vmd->vmd_header[18]);
+    avio_seek(pb, toc_offset, SEEK_SET);
+
+    raw_frame_table = NULL;
+    vmd->frame_table = NULL;
+    sound_buffers = AV_RL16(&vmd->vmd_header[808]);
+    raw_frame_table_size = vmd->frame_count * 6;
+    if(vmd->frame_count * vmd->frames_per_block >= UINT_MAX / sizeof(vmd_frame) - sound_buffers){
+        av_log(s, AV_LOG_ERROR, "vmd->frame_count * vmd->frames_per_block too large\n");
+        return -1;
+    }
+    raw_frame_table = av_malloc(raw_frame_table_size);
+    vmd->frame_table = av_malloc((vmd->frame_count * vmd->frames_per_block + sound_buffers) * sizeof(vmd_frame));
+    if (!raw_frame_table || !vmd->frame_table) {
+        av_free(raw_frame_table);
+        av_free(vmd->frame_table);
+        return AVERROR(ENOMEM);
+    }
+    if (avio_read(pb, raw_frame_table, raw_frame_table_size) !=
+        raw_frame_table_size) {
+        av_free(raw_frame_table);
+        av_free(vmd->frame_table);
+        return AVERROR(EIO);
+    }
+
+    total_frames = 0;
+    for (i = 0; i < vmd->frame_count; i++) {
+
+        current_offset = AV_RL32(&raw_frame_table[6 * i + 2]);
+
+        /* handle each entry in index block */
+        for (j = 0; j < vmd->frames_per_block; j++) {
+            int type;
+            uint32_t size;
+
+            avio_read(pb, chunk, BYTES_PER_FRAME_RECORD);
+            type = chunk[0];
+            size = AV_RL32(&chunk[2]);
+            if(!size && type != 1)
+                continue;
+            switch(type) {
+            case 1: /* Audio Chunk */
+                if (!st) break;
+                /* first audio chunk contains several audio buffers */
+                vmd->frame_table[total_frames].frame_offset = current_offset;
+                vmd->frame_table[total_frames].stream_index = vmd->audio_stream_index;
+                vmd->frame_table[total_frames].frame_size = size;
+                memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
+                vmd->frame_table[total_frames].pts = current_audio_pts;
+                total_frames++;
+                if(!current_audio_pts)
+                    current_audio_pts += sound_buffers - 1;
+                else
+                    current_audio_pts++;
+                break;
+            case 2: /* Video Chunk */
+                vmd->frame_table[total_frames].frame_offset = current_offset;
+                vmd->frame_table[total_frames].stream_index = vmd->video_stream_index;
+                vmd->frame_table[total_frames].frame_size = size;
+                memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
+                vmd->frame_table[total_frames].pts = i;
+                total_frames++;
+                break;
+            }
+            current_offset += size;
+        }
+    }
+
+    av_free(raw_frame_table);
+
+    vmd->current_frame = 0;
+    vmd->frame_count = total_frames;
+
+    return 0;
+}
+
+static int vmd_read_packet(AVFormatContext *s,
+                           AVPacket *pkt)
+{
+    VmdDemuxContext *vmd = s->priv_data;
+    AVIOContext *pb = s->pb;
+    int ret = 0;
+    vmd_frame *frame;
+
+    if (vmd->current_frame >= vmd->frame_count)
+        return AVERROR_EOF;
+
+    frame = &vmd->frame_table[vmd->current_frame];
+    /* position the stream (will probably be there already) */
+    avio_seek(pb, frame->frame_offset, SEEK_SET);
+
+    if(ffio_limit(pb, frame->frame_size) != frame->frame_size)
+        return AVERROR(EIO);
+    if (av_new_packet(pkt, frame->frame_size + BYTES_PER_FRAME_RECORD))
+        return AVERROR(ENOMEM);
+    pkt->pos= avio_tell(pb);
+    memcpy(pkt->data, frame->frame_record, BYTES_PER_FRAME_RECORD);
+    if(vmd->is_indeo3 && frame->frame_record[0] == 0x02)
+        ret = avio_read(pb, pkt->data, frame->frame_size);
+    else
+        ret = avio_read(pb, pkt->data + BYTES_PER_FRAME_RECORD,
+            frame->frame_size);
+
+    if (ret != frame->frame_size) {
+        av_free_packet(pkt);
+        ret = AVERROR(EIO);
+    }
+    pkt->stream_index = frame->stream_index;
+    pkt->pts = frame->pts;
+    av_log(s, AV_LOG_DEBUG, " dispatching %s frame with %d bytes and pts %"PRId64"\n",
+            (frame->frame_record[0] == 0x02) ? "video" : "audio",
+            frame->frame_size + BYTES_PER_FRAME_RECORD,
+            pkt->pts);
+
+    vmd->current_frame++;
+
+    return ret;
+}
+
+static int vmd_read_close(AVFormatContext *s)
+{
+    VmdDemuxContext *vmd = s->priv_data;
+
+    av_free(vmd->frame_table);
+
+    return 0;
+}
+
+AVInputFormat ff_vmd_demuxer = {
+    .name           = "vmd",
+    .long_name      = NULL_IF_CONFIG_SMALL("Sierra VMD"),
+    .priv_data_size = sizeof(VmdDemuxContext),
+    .read_probe     = vmd_probe,
+    .read_header    = vmd_read_header,
+    .read_packet    = vmd_read_packet,
+    .read_close     = vmd_read_close,
+};