making act segmenter

1 files changed, 381 insertions, 0 deletions

diff --git a/ffmpeg/libavformat/gif.c b/ffmpeg/libavformat/gif.c
new file mode 100644
index 0000000..31b0101
--- /dev/null
+++ b/ffmpeg/libavformat/gif.c
@@ -0,0 +1,381 @@
+/*
+ * Animated GIF muxer
+ * Copyright (c) 2000 Fabrice Bellard
+ *
+ * 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
+ */
+
+/*
+ * First version by Francois Revol revol@free.fr
+ *
+ * Features and limitations:
+ * - currently no compression is performed,
+ *   in fact the size of the data is 9/8 the size of the image in 8bpp
+ * - uses only a global standard palette
+ * - tested with IE 5.0, Opera for BeOS, NetPositive (BeOS), and Mozilla (BeOS).
+ *
+ * Reference documents:
+ * http://www.goice.co.jp/member/mo/formats/gif.html
+ * http://astronomy.swin.edu.au/pbourke/dataformats/gif/
+ * http://www.dcs.ed.ac.uk/home/mxr/gfx/2d/GIF89a.txt
+ *
+ * this url claims to have an LZW algorithm not covered by Unisys patent:
+ * http://www.msg.net/utility/whirlgif/gifencod.html
+ * could help reduce the size of the files _a lot_...
+ * some sites mentions an RLE type compression also.
+ */
+
+#include "avformat.h"
+#include "libavutil/log.h"
+#include "libavutil/opt.h"
+
+/* The GIF format uses reversed order for bitstreams... */
+/* at least they don't use PDP_ENDIAN :) */
+#define BITSTREAM_WRITER_LE
+
+#include "libavcodec/put_bits.h"
+
+/* bitstream minipacket size */
+#define GIF_CHUNKS 100
+
+/* slows down the decoding (and some browsers don't like it) */
+/* update on the 'some browsers don't like it issue from above:
+ * this was probably due to missing 'Data Sub-block Terminator'
+ * (byte 19) in the app_header */
+#define GIF_ADD_APP_HEADER // required to enable looping of animated gif
+
+typedef struct {
+    unsigned char r;
+    unsigned char g;
+    unsigned char b;
+} rgb_triplet;
+
+/* we use the standard 216 color palette */
+
+/* this script was used to create the palette:
+ * for r in 00 33 66 99 cc ff; do
+ *     for g in 00 33 66 99 cc ff; do
+ *         echo -n "    "
+ *         for b in 00 33 66 99 cc ff; do
+ *             echo -n "{ 0x$r, 0x$g, 0x$b }, "
+ *         done
+ *         echo ""
+ *     done
+ * done
+ */
+
+static const rgb_triplet gif_clut[216] = {
+    { 0x00, 0x00, 0x00 }, { 0x00, 0x00, 0x33 }, { 0x00, 0x00, 0x66 }, { 0x00, 0x00, 0x99 }, { 0x00, 0x00, 0xcc }, { 0x00, 0x00, 0xff },
+    { 0x00, 0x33, 0x00 }, { 0x00, 0x33, 0x33 }, { 0x00, 0x33, 0x66 }, { 0x00, 0x33, 0x99 }, { 0x00, 0x33, 0xcc }, { 0x00, 0x33, 0xff },
+    { 0x00, 0x66, 0x00 }, { 0x00, 0x66, 0x33 }, { 0x00, 0x66, 0x66 }, { 0x00, 0x66, 0x99 }, { 0x00, 0x66, 0xcc }, { 0x00, 0x66, 0xff },
+    { 0x00, 0x99, 0x00 }, { 0x00, 0x99, 0x33 }, { 0x00, 0x99, 0x66 }, { 0x00, 0x99, 0x99 }, { 0x00, 0x99, 0xcc }, { 0x00, 0x99, 0xff },
+    { 0x00, 0xcc, 0x00 }, { 0x00, 0xcc, 0x33 }, { 0x00, 0xcc, 0x66 }, { 0x00, 0xcc, 0x99 }, { 0x00, 0xcc, 0xcc }, { 0x00, 0xcc, 0xff },
+    { 0x00, 0xff, 0x00 }, { 0x00, 0xff, 0x33 }, { 0x00, 0xff, 0x66 }, { 0x00, 0xff, 0x99 }, { 0x00, 0xff, 0xcc }, { 0x00, 0xff, 0xff },
+    { 0x33, 0x00, 0x00 }, { 0x33, 0x00, 0x33 }, { 0x33, 0x00, 0x66 }, { 0x33, 0x00, 0x99 }, { 0x33, 0x00, 0xcc }, { 0x33, 0x00, 0xff },
+    { 0x33, 0x33, 0x00 }, { 0x33, 0x33, 0x33 }, { 0x33, 0x33, 0x66 }, { 0x33, 0x33, 0x99 }, { 0x33, 0x33, 0xcc }, { 0x33, 0x33, 0xff },
+    { 0x33, 0x66, 0x00 }, { 0x33, 0x66, 0x33 }, { 0x33, 0x66, 0x66 }, { 0x33, 0x66, 0x99 }, { 0x33, 0x66, 0xcc }, { 0x33, 0x66, 0xff },
+    { 0x33, 0x99, 0x00 }, { 0x33, 0x99, 0x33 }, { 0x33, 0x99, 0x66 }, { 0x33, 0x99, 0x99 }, { 0x33, 0x99, 0xcc }, { 0x33, 0x99, 0xff },
+    { 0x33, 0xcc, 0x00 }, { 0x33, 0xcc, 0x33 }, { 0x33, 0xcc, 0x66 }, { 0x33, 0xcc, 0x99 }, { 0x33, 0xcc, 0xcc }, { 0x33, 0xcc, 0xff },
+    { 0x33, 0xff, 0x00 }, { 0x33, 0xff, 0x33 }, { 0x33, 0xff, 0x66 }, { 0x33, 0xff, 0x99 }, { 0x33, 0xff, 0xcc }, { 0x33, 0xff, 0xff },
+    { 0x66, 0x00, 0x00 }, { 0x66, 0x00, 0x33 }, { 0x66, 0x00, 0x66 }, { 0x66, 0x00, 0x99 }, { 0x66, 0x00, 0xcc }, { 0x66, 0x00, 0xff },
+    { 0x66, 0x33, 0x00 }, { 0x66, 0x33, 0x33 }, { 0x66, 0x33, 0x66 }, { 0x66, 0x33, 0x99 }, { 0x66, 0x33, 0xcc }, { 0x66, 0x33, 0xff },
+    { 0x66, 0x66, 0x00 }, { 0x66, 0x66, 0x33 }, { 0x66, 0x66, 0x66 }, { 0x66, 0x66, 0x99 }, { 0x66, 0x66, 0xcc }, { 0x66, 0x66, 0xff },
+    { 0x66, 0x99, 0x00 }, { 0x66, 0x99, 0x33 }, { 0x66, 0x99, 0x66 }, { 0x66, 0x99, 0x99 }, { 0x66, 0x99, 0xcc }, { 0x66, 0x99, 0xff },
+    { 0x66, 0xcc, 0x00 }, { 0x66, 0xcc, 0x33 }, { 0x66, 0xcc, 0x66 }, { 0x66, 0xcc, 0x99 }, { 0x66, 0xcc, 0xcc }, { 0x66, 0xcc, 0xff },
+    { 0x66, 0xff, 0x00 }, { 0x66, 0xff, 0x33 }, { 0x66, 0xff, 0x66 }, { 0x66, 0xff, 0x99 }, { 0x66, 0xff, 0xcc }, { 0x66, 0xff, 0xff },
+    { 0x99, 0x00, 0x00 }, { 0x99, 0x00, 0x33 }, { 0x99, 0x00, 0x66 }, { 0x99, 0x00, 0x99 }, { 0x99, 0x00, 0xcc }, { 0x99, 0x00, 0xff },
+    { 0x99, 0x33, 0x00 }, { 0x99, 0x33, 0x33 }, { 0x99, 0x33, 0x66 }, { 0x99, 0x33, 0x99 }, { 0x99, 0x33, 0xcc }, { 0x99, 0x33, 0xff },
+    { 0x99, 0x66, 0x00 }, { 0x99, 0x66, 0x33 }, { 0x99, 0x66, 0x66 }, { 0x99, 0x66, 0x99 }, { 0x99, 0x66, 0xcc }, { 0x99, 0x66, 0xff },
+    { 0x99, 0x99, 0x00 }, { 0x99, 0x99, 0x33 }, { 0x99, 0x99, 0x66 }, { 0x99, 0x99, 0x99 }, { 0x99, 0x99, 0xcc }, { 0x99, 0x99, 0xff },
+    { 0x99, 0xcc, 0x00 }, { 0x99, 0xcc, 0x33 }, { 0x99, 0xcc, 0x66 }, { 0x99, 0xcc, 0x99 }, { 0x99, 0xcc, 0xcc }, { 0x99, 0xcc, 0xff },
+    { 0x99, 0xff, 0x00 }, { 0x99, 0xff, 0x33 }, { 0x99, 0xff, 0x66 }, { 0x99, 0xff, 0x99 }, { 0x99, 0xff, 0xcc }, { 0x99, 0xff, 0xff },
+    { 0xcc, 0x00, 0x00 }, { 0xcc, 0x00, 0x33 }, { 0xcc, 0x00, 0x66 }, { 0xcc, 0x00, 0x99 }, { 0xcc, 0x00, 0xcc }, { 0xcc, 0x00, 0xff },
+    { 0xcc, 0x33, 0x00 }, { 0xcc, 0x33, 0x33 }, { 0xcc, 0x33, 0x66 }, { 0xcc, 0x33, 0x99 }, { 0xcc, 0x33, 0xcc }, { 0xcc, 0x33, 0xff },
+    { 0xcc, 0x66, 0x00 }, { 0xcc, 0x66, 0x33 }, { 0xcc, 0x66, 0x66 }, { 0xcc, 0x66, 0x99 }, { 0xcc, 0x66, 0xcc }, { 0xcc, 0x66, 0xff },
+    { 0xcc, 0x99, 0x00 }, { 0xcc, 0x99, 0x33 }, { 0xcc, 0x99, 0x66 }, { 0xcc, 0x99, 0x99 }, { 0xcc, 0x99, 0xcc }, { 0xcc, 0x99, 0xff },
+    { 0xcc, 0xcc, 0x00 }, { 0xcc, 0xcc, 0x33 }, { 0xcc, 0xcc, 0x66 }, { 0xcc, 0xcc, 0x99 }, { 0xcc, 0xcc, 0xcc }, { 0xcc, 0xcc, 0xff },
+    { 0xcc, 0xff, 0x00 }, { 0xcc, 0xff, 0x33 }, { 0xcc, 0xff, 0x66 }, { 0xcc, 0xff, 0x99 }, { 0xcc, 0xff, 0xcc }, { 0xcc, 0xff, 0xff },
+    { 0xff, 0x00, 0x00 }, { 0xff, 0x00, 0x33 }, { 0xff, 0x00, 0x66 }, { 0xff, 0x00, 0x99 }, { 0xff, 0x00, 0xcc }, { 0xff, 0x00, 0xff },
+    { 0xff, 0x33, 0x00 }, { 0xff, 0x33, 0x33 }, { 0xff, 0x33, 0x66 }, { 0xff, 0x33, 0x99 }, { 0xff, 0x33, 0xcc }, { 0xff, 0x33, 0xff },
+    { 0xff, 0x66, 0x00 }, { 0xff, 0x66, 0x33 }, { 0xff, 0x66, 0x66 }, { 0xff, 0x66, 0x99 }, { 0xff, 0x66, 0xcc }, { 0xff, 0x66, 0xff },
+    { 0xff, 0x99, 0x00 }, { 0xff, 0x99, 0x33 }, { 0xff, 0x99, 0x66 }, { 0xff, 0x99, 0x99 }, { 0xff, 0x99, 0xcc }, { 0xff, 0x99, 0xff },
+    { 0xff, 0xcc, 0x00 }, { 0xff, 0xcc, 0x33 }, { 0xff, 0xcc, 0x66 }, { 0xff, 0xcc, 0x99 }, { 0xff, 0xcc, 0xcc }, { 0xff, 0xcc, 0xff },
+    { 0xff, 0xff, 0x00 }, { 0xff, 0xff, 0x33 }, { 0xff, 0xff, 0x66 }, { 0xff, 0xff, 0x99 }, { 0xff, 0xff, 0xcc }, { 0xff, 0xff, 0xff },
+};
+
+/* GIF header */
+static int gif_image_write_header(AVIOContext *pb, int width, int height,
+                                  int loop_count, uint32_t *palette)
+{
+    int i;
+    unsigned int v;
+
+    avio_write(pb, "GIF", 3);
+    avio_write(pb, "89a", 3);
+    avio_wl16(pb, width);
+    avio_wl16(pb, height);
+
+    avio_w8(pb, 0xf7); /* flags: global clut, 256 entries */
+    avio_w8(pb, 0x1f); /* background color index */
+    avio_w8(pb, 0);    /* aspect ratio */
+
+    /* the global palette */
+    if (!palette) {
+        avio_write(pb, (const unsigned char *)gif_clut, 216 * 3);
+        for (i = 0; i < ((256 - 216) * 3); i++)
+            avio_w8(pb, 0);
+    } else {
+        for (i = 0; i < 256; i++) {
+            v = palette[i];
+            avio_w8(pb, (v >> 16) & 0xff);
+            avio_w8(pb, (v >>  8) & 0xff);
+            avio_w8(pb, (v)       & 0xff);
+        }
+    }
+
+    /* update: this is the 'NETSCAPE EXTENSION' that allows for looped animated
+     * GIF, see http://members.aol.com/royalef/gifabout.htm#net-extension
+     *
+     * byte   1       : 33 (hex 0x21) GIF Extension code
+     * byte   2       : 255 (hex 0xFF) Application Extension Label
+     * byte   3       : 11 (hex (0x0B) Length of Application Block
+     *                          (eleven bytes of data to follow)
+     * bytes  4 to 11 : "NETSCAPE"
+     * bytes 12 to 14 : "2.0"
+     * byte  15       : 3 (hex 0x03) Length of Data Sub-Block
+     *                          (three bytes of data to follow)
+     * byte  16       : 1 (hex 0x01)
+     * bytes 17 to 18 : 0 to 65535, an unsigned integer in
+     *                          lo-hi byte format. This indicate the
+     *                          number of iterations the loop should
+     *                          be executed.
+     * bytes 19       : 0 (hex 0x00) a Data Sub-block Terminator
+     */
+
+    /* application extension header */
+#ifdef GIF_ADD_APP_HEADER
+    if (loop_count >= 0 && loop_count <= 65535) {
+        avio_w8(pb, 0x21);
+        avio_w8(pb, 0xff);
+        avio_w8(pb, 0x0b);
+        // bytes 4 to 14
+        avio_write(pb, "NETSCAPE2.0", sizeof("NETSCAPE2.0") - 1);
+        avio_w8(pb, 0x03); // byte 15
+        avio_w8(pb, 0x01); // byte 16
+        avio_wl16(pb, (uint16_t)loop_count);
+        avio_w8(pb, 0x00); // byte 19
+    }
+#endif
+    return 0;
+}
+
+/* this is maybe slow, but allows for extensions */
+static inline unsigned char gif_clut_index(uint8_t r, uint8_t g, uint8_t b)
+{
+    return (((r) / 47) % 6) * 6 * 6 + (((g) / 47) % 6) * 6 + (((b) / 47) % 6);
+}
+
+static int gif_image_write_image(AVIOContext *pb,
+                                 int x1, int y1, int width, int height,
+                                 const uint8_t *buf, int linesize, int pix_fmt)
+{
+    PutBitContext p;
+    uint8_t buffer[200]; /* 100 * 9 / 8 = 113 */
+    int i, left, w, v;
+    const uint8_t *ptr;
+    /* image block */
+
+    avio_w8(pb, 0x2c);
+    avio_wl16(pb, x1);
+    avio_wl16(pb, y1);
+    avio_wl16(pb, width);
+    avio_wl16(pb, height);
+    avio_w8(pb, 0x00); /* flags */
+    /* no local clut */
+
+    avio_w8(pb, 0x08);
+
+    left = width * height;
+
+    init_put_bits(&p, buffer, 130);
+
+/*
+ * the thing here is the bitstream is written as little packets, with a size
+ * byte before but it's still the same bitstream between packets (no flush !)
+ */
+    ptr = buf;
+    w   = width;
+    while (left > 0) {
+        put_bits(&p, 9, 0x0100); /* clear code */
+
+        for (i = (left < GIF_CHUNKS) ? left : GIF_CHUNKS; i; i--) {
+            if (pix_fmt == AV_PIX_FMT_RGB24) {
+                v    = gif_clut_index(ptr[0], ptr[1], ptr[2]);
+                ptr += 3;
+            } else {
+                v = *ptr++;
+            }
+            put_bits(&p, 9, v);
+            if (--w == 0) {
+                w    = width;
+                buf += linesize;
+                ptr  = buf;
+            }
+        }
+
+        if (left <= GIF_CHUNKS) {
+            put_bits(&p, 9, 0x101); /* end of stream */
+            flush_put_bits(&p);
+        }
+        if (put_bits_ptr(&p) - p.buf > 0) {
+            avio_w8(pb, put_bits_ptr(&p) - p.buf); /* byte count of the packet */
+            avio_write(pb, p.buf, put_bits_ptr(&p) - p.buf); /* the actual buffer */
+            p.buf_ptr = p.buf; /* dequeue the bytes off the bitstream */
+        }
+        left -= GIF_CHUNKS;
+    }
+    avio_w8(pb, 0x00); /* end of image block */
+
+    return 0;
+}
+
+typedef struct {
+    AVClass *class;         /** Class for private options. */
+    int64_t time, file_time;
+    uint8_t buffer[100]; /* data chunks */
+    int loop;
+} GIFContext;
+
+static int gif_write_header(AVFormatContext *s)
+{
+    GIFContext *gif = s->priv_data;
+    AVIOContext *pb = s->pb;
+    AVCodecContext *enc, *video_enc;
+    int i, width, height /*, rate*/;
+
+/* XXX: do we reject audio streams or just ignore them ?
+ *  if (s->nb_streams > 1)
+ *      return -1;
+ */
+    gif->time      = 0;
+    gif->file_time = 0;
+
+    video_enc = NULL;
+    for (i = 0; i < s->nb_streams; i++) {
+        enc = s->streams[i]->codec;
+        if (enc->codec_type != AVMEDIA_TYPE_AUDIO)
+            video_enc = enc;
+    }
+
+    if (!video_enc) {
+        av_free(gif);
+        return -1;
+    } else {
+        width  = video_enc->width;
+        height = video_enc->height;
+//        rate = video_enc->time_base.den;
+    }
+
+    if (video_enc->pix_fmt != AV_PIX_FMT_RGB24) {
+        av_log(s, AV_LOG_ERROR,
+               "ERROR: gif only handles the rgb24 pixel format. Use -pix_fmt rgb24.\n");
+        return AVERROR(EIO);
+    }
+
+    gif_image_write_header(pb, width, height, gif->loop, NULL);
+
+    avio_flush(s->pb);
+    return 0;
+}
+
+static int gif_write_video(AVFormatContext *s, AVCodecContext *enc,
+                           const uint8_t *buf, int size)
+{
+    AVIOContext *pb = s->pb;
+    int jiffies;
+
+    /* graphic control extension block */
+    avio_w8(pb, 0x21);
+    avio_w8(pb, 0xf9);
+    avio_w8(pb, 0x04); /* block size */
+    avio_w8(pb, 0x04); /* flags */
+
+    /* 1 jiffy is 1/70 s */
+    /* the delay_time field indicates the number of jiffies - 1 */
+    /* XXX: should use delay, in order to be more accurate */
+    /* instead of using the same rounded value each time */
+    /* XXX: don't even remember if I really use it for now */
+    jiffies = (70 * enc->time_base.num / enc->time_base.den) - 1;
+
+    avio_wl16(pb, jiffies);
+
+    avio_w8(pb, 0x1f); /* transparent color index */
+    avio_w8(pb, 0x00);
+
+    gif_image_write_image(pb, 0, 0, enc->width, enc->height,
+                          buf, enc->width * 3, AV_PIX_FMT_RGB24);
+
+    avio_flush(s->pb);
+    return 0;
+}
+
+static int gif_write_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
+    if (codec->codec_type == AVMEDIA_TYPE_AUDIO)
+        return 0; /* just ignore audio */
+    else
+        return gif_write_video(s, codec, pkt->data, pkt->size);
+}
+
+static int gif_write_trailer(AVFormatContext *s)
+{
+    AVIOContext *pb = s->pb;
+
+    avio_w8(pb, 0x3b);
+
+    return 0;
+}
+
+#define OFFSET(x) offsetof(GIFContext, x)
+#define ENC AV_OPT_FLAG_ENCODING_PARAM
+static const AVOption options[] = {
+    { "loop", "Number of times to loop the output.", OFFSET(loop),
+      AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 65535, ENC },
+    { NULL },
+};
+
+static const AVClass gif_muxer_class = {
+    .class_name = "GIF muxer",
+    .item_name  = av_default_item_name,
+    .version    = LIBAVUTIL_VERSION_INT,
+    .option     = options,
+};
+
+AVOutputFormat ff_gif_muxer = {
+    .name           = "gif",
+    .long_name      = NULL_IF_CONFIG_SMALL("GIF Animation"),
+    .mime_type      = "image/gif",
+    .extensions     = "gif",
+    .priv_data_size = sizeof(GIFContext),
+    .audio_codec    = AV_CODEC_ID_NONE,
+    .video_codec    = AV_CODEC_ID_RAWVIDEO,
+    .write_header   = gif_write_header,
+    .write_packet   = gif_write_packet,
+    .write_trailer  = gif_write_trailer,
+    .priv_class     = &gif_muxer_class,
+};