making act segmenter

1 files changed, 296 insertions, 0 deletions

diff --git a/ffmpeg/libavformat/bethsoftvid.c b/ffmpeg/libavformat/bethsoftvid.c
new file mode 100644
index 0000000..b8f08c1
--- /dev/null
+++ b/ffmpeg/libavformat/bethsoftvid.c
@@ -0,0 +1,296 @@
+/*
+ * Bethsoft VID format Demuxer
+ * Copyright (c) 2007 Nicholas Tung
+ *
+ * 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
+ * @brief Bethesda Softworks VID (.vid) file demuxer
+ * @author Nicholas Tung [ntung (at. ntung com] (2007-03)
+ * @see http://wiki.multimedia.cx/index.php?title=Bethsoft_VID
+ * @see http://www.svatopluk.com/andux/docs/dfvid.html
+ */
+
+#include "libavutil/channel_layout.h"
+#include "libavutil/intreadwrite.h"
+#include "avformat.h"
+#include "internal.h"
+#include "libavcodec/bethsoftvideo.h"
+
+#define BVID_PALETTE_SIZE 3 * 256
+
+#define DEFAULT_SAMPLE_RATE 11111
+
+typedef struct BVID_DemuxContext
+{
+    int nframes;
+    int sample_rate;        /**< audio sample rate */
+    int width;              /**< video width       */
+    int height;             /**< video height      */
+    /** delay value between frames, added to individual frame delay.
+     * custom units, which will be added to other custom units (~=16ms according
+     * to free, unofficial documentation) */
+    int bethsoft_global_delay;
+    int video_index;        /**< video stream index */
+    int audio_index;        /**< audio stream index */
+    uint8_t *palette;
+
+    int is_finished;
+
+} BVID_DemuxContext;
+
+static int vid_probe(AVProbeData *p)
+{
+    // little-endian VID tag, file starts with "VID\0"
+    if (AV_RL32(p->buf) != MKTAG('V', 'I', 'D', 0))
+        return 0;
+
+    return AVPROBE_SCORE_MAX;
+}
+
+static int vid_read_header(AVFormatContext *s)
+{
+    BVID_DemuxContext *vid = s->priv_data;
+    AVIOContext *pb = s->pb;
+
+    /* load main header. Contents:
+    *    bytes: 'V' 'I' 'D'
+    *    int16s: always_512, nframes, width, height, delay, always_14
+    */
+    avio_skip(pb, 5);
+    vid->nframes = avio_rl16(pb);
+    vid->width   = avio_rl16(pb);
+    vid->height  = avio_rl16(pb);
+    vid->bethsoft_global_delay = avio_rl16(pb);
+    avio_rl16(pb);
+
+    // wait until the first packet to create each stream
+    vid->video_index = -1;
+    vid->audio_index = -1;
+    vid->sample_rate = DEFAULT_SAMPLE_RATE;
+    s->ctx_flags |= AVFMTCTX_NOHEADER;
+
+    return 0;
+}
+
+#define BUFFER_PADDING_SIZE 1000
+static int read_frame(BVID_DemuxContext *vid, AVIOContext *pb, AVPacket *pkt,
+                      uint8_t block_type, AVFormatContext *s)
+{
+    uint8_t * vidbuf_start = NULL;
+    int vidbuf_nbytes = 0;
+    int code;
+    int bytes_copied = 0;
+    int position, duration, npixels;
+    unsigned int vidbuf_capacity;
+    int ret = 0;
+    AVStream *st;
+
+    if (vid->video_index < 0) {
+        st = avformat_new_stream(s, NULL);
+        if (!st)
+            return AVERROR(ENOMEM);
+        vid->video_index = st->index;
+        if (vid->audio_index < 0) {
+            avpriv_request_sample(s, "Using default video time base since "
+                                  "having no audio packet before the first "
+                                  "video packet");
+        }
+        avpriv_set_pts_info(st, 64, 185, vid->sample_rate);
+        st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
+        st->codec->codec_id   = AV_CODEC_ID_BETHSOFTVID;
+        st->codec->width      = vid->width;
+        st->codec->height     = vid->height;
+    }
+    st      = s->streams[vid->video_index];
+    npixels = st->codec->width * st->codec->height;
+
+    vidbuf_start = av_malloc(vidbuf_capacity = BUFFER_PADDING_SIZE);
+    if(!vidbuf_start)
+        return AVERROR(ENOMEM);
+
+    // save the file position for the packet, include block type
+    position = avio_tell(pb) - 1;
+
+    vidbuf_start[vidbuf_nbytes++] = block_type;
+
+    // get the current packet duration
+    duration = vid->bethsoft_global_delay + avio_rl16(pb);
+
+    // set the y offset if it exists (decoder header data should be in data section)
+    if(block_type == VIDEO_YOFF_P_FRAME){
+        if (avio_read(pb, &vidbuf_start[vidbuf_nbytes], 2) != 2) {
+            ret = AVERROR(EIO);
+            goto fail;
+        }
+        vidbuf_nbytes += 2;
+    }
+
+    do{
+        vidbuf_start = av_fast_realloc(vidbuf_start, &vidbuf_capacity, vidbuf_nbytes + BUFFER_PADDING_SIZE);
+        if(!vidbuf_start)
+            return AVERROR(ENOMEM);
+
+        code = avio_r8(pb);
+        vidbuf_start[vidbuf_nbytes++] = code;
+
+        if(code >= 0x80){ // rle sequence
+            if(block_type == VIDEO_I_FRAME)
+                vidbuf_start[vidbuf_nbytes++] = avio_r8(pb);
+        } else if(code){ // plain sequence
+            if (avio_read(pb, &vidbuf_start[vidbuf_nbytes], code) != code) {
+                ret = AVERROR(EIO);
+                goto fail;
+            }
+            vidbuf_nbytes += code;
+        }
+        bytes_copied += code & 0x7F;
+        if(bytes_copied == npixels){ // sometimes no stop character is given, need to keep track of bytes copied
+            // may contain a 0 byte even if read all pixels
+            if(avio_r8(pb))
+                avio_seek(pb, -1, SEEK_CUR);
+            break;
+        }
+        if (bytes_copied > npixels) {
+            ret = AVERROR_INVALIDDATA;
+            goto fail;
+        }
+    } while(code);
+
+    // copy data into packet
+    if ((ret = av_new_packet(pkt, vidbuf_nbytes)) < 0)
+        goto fail;
+    memcpy(pkt->data, vidbuf_start, vidbuf_nbytes);
+    av_free(vidbuf_start);
+
+    pkt->pos = position;
+    pkt->stream_index = vid->video_index;
+    pkt->duration = duration;
+    if (block_type == VIDEO_I_FRAME)
+        pkt->flags |= AV_PKT_FLAG_KEY;
+
+    /* if there is a new palette available, add it to packet side data */
+    if (vid->palette) {
+        uint8_t *pdata = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE,
+                                                 BVID_PALETTE_SIZE);
+        if (pdata)
+            memcpy(pdata, vid->palette, BVID_PALETTE_SIZE);
+        av_freep(&vid->palette);
+    }
+
+    vid->nframes--;  // used to check if all the frames were read
+    return 0;
+fail:
+    av_free(vidbuf_start);
+    return ret;
+}
+
+static int vid_read_packet(AVFormatContext *s,
+                           AVPacket *pkt)
+{
+    BVID_DemuxContext *vid = s->priv_data;
+    AVIOContext *pb = s->pb;
+    unsigned char block_type;
+    int audio_length;
+    int ret_value;
+
+    if(vid->is_finished || url_feof(pb))
+        return AVERROR_EOF;
+
+    block_type = avio_r8(pb);
+    switch(block_type){
+        case PALETTE_BLOCK:
+            if (vid->palette) {
+                av_log(s, AV_LOG_WARNING, "discarding unused palette\n");
+                av_freep(&vid->palette);
+            }
+            vid->palette = av_malloc(BVID_PALETTE_SIZE);
+            if (!vid->palette)
+                return AVERROR(ENOMEM);
+            if (avio_read(pb, vid->palette, BVID_PALETTE_SIZE) != BVID_PALETTE_SIZE) {
+                av_freep(&vid->palette);
+                return AVERROR(EIO);
+            }
+            return vid_read_packet(s, pkt);
+
+        case FIRST_AUDIO_BLOCK:
+            avio_rl16(pb);
+            // soundblaster DAC used for sample rate, as on specification page (link above)
+            vid->sample_rate = 1000000 / (256 - avio_r8(pb));
+        case AUDIO_BLOCK:
+            if (vid->audio_index < 0) {
+                AVStream *st = avformat_new_stream(s, NULL);
+                if (!st)
+                    return AVERROR(ENOMEM);
+                vid->audio_index                 = st->index;
+                st->codec->codec_type            = AVMEDIA_TYPE_AUDIO;
+                st->codec->codec_id              = AV_CODEC_ID_PCM_U8;
+                st->codec->channels              = 1;
+                st->codec->channel_layout        = AV_CH_LAYOUT_MONO;
+                st->codec->bits_per_coded_sample = 8;
+                st->codec->sample_rate           = vid->sample_rate;
+                st->codec->bit_rate              = 8 * st->codec->sample_rate;
+                st->start_time                   = 0;
+                avpriv_set_pts_info(st, 64, 1, vid->sample_rate);
+            }
+            audio_length = avio_rl16(pb);
+            if ((ret_value = av_get_packet(pb, pkt, audio_length)) != audio_length) {
+                if (ret_value < 0)
+                    return ret_value;
+                av_log(s, AV_LOG_ERROR, "incomplete audio block\n");
+                return AVERROR(EIO);
+            }
+            pkt->stream_index = vid->audio_index;
+            pkt->duration     = audio_length;
+            pkt->flags |= AV_PKT_FLAG_KEY;
+            return 0;
+
+        case VIDEO_P_FRAME:
+        case VIDEO_YOFF_P_FRAME:
+        case VIDEO_I_FRAME:
+            return read_frame(vid, pb, pkt, block_type, s);
+
+        case EOF_BLOCK:
+            if(vid->nframes != 0)
+                av_log(s, AV_LOG_VERBOSE, "reached terminating character but not all frames read.\n");
+            vid->is_finished = 1;
+            return AVERROR(EIO);
+        default:
+            av_log(s, AV_LOG_ERROR, "unknown block (character = %c, decimal = %d, hex = %x)!!!\n",
+                   block_type, block_type, block_type);
+            return AVERROR_INVALIDDATA;
+    }
+}
+
+static int vid_read_close(AVFormatContext *s)
+{
+    BVID_DemuxContext *vid = s->priv_data;
+    av_freep(&vid->palette);
+    return 0;
+}
+
+AVInputFormat ff_bethsoftvid_demuxer = {
+    .name           = "bethsoftvid",
+    .long_name      = NULL_IF_CONFIG_SMALL("Bethesda Softworks VID"),
+    .priv_data_size = sizeof(BVID_DemuxContext),
+    .read_probe     = vid_probe,
+    .read_header    = vid_read_header,
+    .read_packet    = vid_read_packet,
+    .read_close     = vid_read_close,
+};