making act segmenter

1 files changed, 402 insertions, 0 deletions

diff --git a/ffmpeg/libavcodec/qtrleenc.c b/ffmpeg/libavcodec/qtrleenc.c
new file mode 100644
index 0000000..a25c45d
--- /dev/null
+++ b/ffmpeg/libavcodec/qtrleenc.c
@@ -0,0 +1,402 @@
+/*
+ * Quicktime Animation (RLE) Video Encoder
+ * Copyright (C) 2007 Clemens Fruhwirth
+ * Copyright (C) 2007 Alexis Ballier
+ *
+ * This file is based on flashsvenc.c.
+ *
+ * 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 "libavutil/imgutils.h"
+#include "avcodec.h"
+#include "bytestream.h"
+#include "internal.h"
+
+/** Maximum RLE code for bulk copy */
+#define MAX_RLE_BULK   127
+/** Maximum RLE code for repeat */
+#define MAX_RLE_REPEAT 128
+/** Maximum RLE code for skip */
+#define MAX_RLE_SKIP   254
+
+typedef struct QtrleEncContext {
+    AVCodecContext *avctx;
+    AVFrame frame;
+    int pixel_size;
+    AVPicture previous_frame;
+    unsigned int max_buf_size;
+    int logical_width;
+    /**
+     * This array will contain at ith position the value of the best RLE code
+     * if the line started at pixel i
+     * There can be 3 values :
+     * skip (0)     : skip as much as possible pixels because they are equal to the
+     *                previous frame ones
+     * repeat (<-1) : repeat that pixel -rle_code times, still as much as
+     *                possible
+     * copy (>0)    : copy the raw next rle_code pixels */
+    signed char *rlecode_table;
+    /**
+     * This array will contain the length of the best rle encoding of the line
+     * starting at ith pixel */
+    int *length_table;
+    /**
+     * Will contain at ith position the number of consecutive pixels equal to the previous
+     * frame starting from pixel i */
+    uint8_t* skip_table;
+} QtrleEncContext;
+
+static av_cold int qtrle_encode_init(AVCodecContext *avctx)
+{
+    QtrleEncContext *s = avctx->priv_data;
+    int ret;
+
+    if (av_image_check_size(avctx->width, avctx->height, 0, avctx) < 0) {
+        return AVERROR(EINVAL);
+    }
+    s->avctx=avctx;
+    s->logical_width=avctx->width;
+
+    switch (avctx->pix_fmt) {
+    case AV_PIX_FMT_GRAY8:
+        s->logical_width = avctx->width / 4;
+        s->pixel_size = 4;
+        break;
+    case AV_PIX_FMT_RGB555BE:
+        s->pixel_size = 2;
+        break;
+    case AV_PIX_FMT_RGB24:
+        s->pixel_size = 3;
+        break;
+    case AV_PIX_FMT_ARGB:
+        s->pixel_size = 4;
+        break;
+    default:
+        av_log(avctx, AV_LOG_ERROR, "Unsupported colorspace.\n");
+        break;
+    }
+    avctx->bits_per_coded_sample = avctx->pix_fmt == AV_PIX_FMT_GRAY8 ? 40 : s->pixel_size*8;
+
+    s->rlecode_table = av_mallocz(s->logical_width);
+    s->skip_table    = av_mallocz(s->logical_width);
+    s->length_table  = av_mallocz((s->logical_width + 1)*sizeof(int));
+    if (!s->skip_table || !s->length_table || !s->rlecode_table) {
+        av_log(avctx, AV_LOG_ERROR, "Error allocating memory.\n");
+        return AVERROR(ENOMEM);
+    }
+    if ((ret = avpicture_alloc(&s->previous_frame, avctx->pix_fmt, avctx->width, avctx->height)) < 0) {
+        av_log(avctx, AV_LOG_ERROR, "Error allocating picture\n");
+        return ret;
+    }
+
+    s->max_buf_size = s->logical_width*s->avctx->height*s->pixel_size*2 /* image base material */
+                      + 15                                            /* header + footer */
+                      + s->avctx->height*2                            /* skip code+rle end */
+                      + s->logical_width/MAX_RLE_BULK + 1             /* rle codes */;
+    avctx->coded_frame = &s->frame;
+    return 0;
+}
+
+/**
+ * Compute the best RLE sequence for a line
+ */
+static void qtrle_encode_line(QtrleEncContext *s, const AVFrame *p, int line, uint8_t **buf)
+{
+    int width=s->logical_width;
+    int i;
+    signed char rlecode;
+
+    /* This will be the number of pixels equal to the preivous frame one's
+     * starting from the ith pixel */
+    unsigned int skipcount;
+    /* This will be the number of consecutive equal pixels in the current
+     * frame, starting from the ith one also */
+    unsigned int av_uninit(repeatcount);
+
+    /* The cost of the three different possibilities */
+    int total_skip_cost;
+    int total_repeat_cost;
+
+    int base_bulk_cost;
+    int lowest_bulk_cost;
+    int lowest_bulk_cost_index;
+    int sec_lowest_bulk_cost;
+    int sec_lowest_bulk_cost_index;
+
+    uint8_t *this_line = p->               data[0] + line*p->               linesize[0] +
+        (width - 1)*s->pixel_size;
+    uint8_t *prev_line = s->previous_frame.data[0] + line*s->previous_frame.linesize[0] +
+        (width - 1)*s->pixel_size;
+
+    s->length_table[width] = 0;
+    skipcount = 0;
+
+    /* Initial values */
+    lowest_bulk_cost = INT_MAX / 2;
+    lowest_bulk_cost_index = width;
+    sec_lowest_bulk_cost = INT_MAX / 2;
+    sec_lowest_bulk_cost_index = width;
+
+    base_bulk_cost = 1 + s->pixel_size;
+
+    for (i = width - 1; i >= 0; i--) {
+
+        int prev_bulk_cost;
+
+        /* If our lowest bulk cost index is too far away, replace it
+         * with the next lowest bulk cost */
+        if (FFMIN(width, i + MAX_RLE_BULK) < lowest_bulk_cost_index) {
+            lowest_bulk_cost = sec_lowest_bulk_cost;
+            lowest_bulk_cost_index = sec_lowest_bulk_cost_index;
+
+            sec_lowest_bulk_cost = INT_MAX / 2;
+            sec_lowest_bulk_cost_index = width;
+        }
+
+        /* Deal with the first pixel's bulk cost */
+        if (!i) {
+            base_bulk_cost++;
+            lowest_bulk_cost++;
+            sec_lowest_bulk_cost++;
+        }
+
+        /* Look at the bulk cost of the previous loop and see if it is
+         * a new lower bulk cost */
+        prev_bulk_cost = s->length_table[i + 1] + base_bulk_cost;
+        if (prev_bulk_cost <= sec_lowest_bulk_cost) {
+            /* If it's lower than the 2nd lowest, then it may be lower
+             * than the lowest */
+            if (prev_bulk_cost <= lowest_bulk_cost) {
+
+                /* If we have found a new lowest bulk cost,
+                 * then the 2nd lowest bulk cost is now farther than the
+                 * lowest bulk cost, and will never be used */
+                sec_lowest_bulk_cost = INT_MAX / 2;
+
+                lowest_bulk_cost = prev_bulk_cost;
+                lowest_bulk_cost_index = i + 1;
+            } else {
+                /* Then it must be the 2nd lowest bulk cost */
+                sec_lowest_bulk_cost = prev_bulk_cost;
+                sec_lowest_bulk_cost_index = i + 1;
+            }
+        }
+
+        if (!s->frame.key_frame && !memcmp(this_line, prev_line, s->pixel_size))
+            skipcount = FFMIN(skipcount + 1, MAX_RLE_SKIP);
+        else
+            skipcount = 0;
+
+        total_skip_cost  = s->length_table[i + skipcount] + 2;
+        s->skip_table[i] = skipcount;
+
+
+        if (i < width - 1 && !memcmp(this_line, this_line + s->pixel_size, s->pixel_size))
+            repeatcount = FFMIN(repeatcount + 1, MAX_RLE_REPEAT);
+        else
+            repeatcount = 1;
+
+        total_repeat_cost = s->length_table[i + repeatcount] + 1 + s->pixel_size;
+
+        /* skip code is free for the first pixel, it costs one byte for repeat and bulk copy
+         * so let's make it aware */
+        if (i == 0) {
+            total_skip_cost--;
+            total_repeat_cost++;
+        }
+
+        if (repeatcount > 1 && (skipcount == 0 || total_repeat_cost < total_skip_cost)) {
+            /* repeat is the best */
+            s->length_table[i]  = total_repeat_cost;
+            s->rlecode_table[i] = -repeatcount;
+        }
+        else if (skipcount > 0) {
+            /* skip is the best choice here */
+            s->length_table[i]  = total_skip_cost;
+            s->rlecode_table[i] = 0;
+        }
+        else {
+            /* We cannot do neither skip nor repeat
+             * thus we use the best bulk copy  */
+
+            s->length_table[i]  = lowest_bulk_cost;
+            s->rlecode_table[i] = lowest_bulk_cost_index - i;
+
+        }
+
+        /* These bulk costs increase every iteration */
+        lowest_bulk_cost += s->pixel_size;
+        sec_lowest_bulk_cost += s->pixel_size;
+
+        this_line -= s->pixel_size;
+        prev_line -= s->pixel_size;
+    }
+
+    /* Good ! Now we have the best sequence for this line, let's output it */
+
+    /* We do a special case for the first pixel so that we avoid testing it in
+     * the whole loop */
+
+    i=0;
+    this_line = p->               data[0] + line*p->linesize[0];
+
+    if (s->rlecode_table[0] == 0) {
+        bytestream_put_byte(buf, s->skip_table[0] + 1);
+        i += s->skip_table[0];
+    }
+    else bytestream_put_byte(buf, 1);
+
+
+    while (i < width) {
+        rlecode = s->rlecode_table[i];
+        bytestream_put_byte(buf, rlecode);
+        if (rlecode == 0) {
+            /* Write a skip sequence */
+            bytestream_put_byte(buf, s->skip_table[i] + 1);
+            i += s->skip_table[i];
+        }
+        else if (rlecode > 0) {
+            /* bulk copy */
+            if (s->avctx->pix_fmt == AV_PIX_FMT_GRAY8) {
+                int j;
+                // QT grayscale colorspace has 0=white and 255=black, we will
+                // ignore the palette that is included in the AVFrame because
+                // AV_PIX_FMT_GRAY8 has defined color mapping
+                for (j = 0; j < rlecode*s->pixel_size; ++j)
+                    bytestream_put_byte(buf, *(this_line + i*s->pixel_size + j) ^ 0xff);
+            } else {
+                bytestream_put_buffer(buf, this_line + i*s->pixel_size, rlecode*s->pixel_size);
+            }
+            i += rlecode;
+        }
+        else {
+            /* repeat the bits */
+            if (s->avctx->pix_fmt == AV_PIX_FMT_GRAY8) {
+                int j;
+                // QT grayscale colorspace has 0=white and 255=black, ...
+                for (j = 0; j < s->pixel_size; ++j)
+                    bytestream_put_byte(buf, *(this_line + i*s->pixel_size + j) ^ 0xff);
+            } else {
+                bytestream_put_buffer(buf, this_line + i*s->pixel_size, s->pixel_size);
+            }
+            i -= rlecode;
+        }
+    }
+    bytestream_put_byte(buf, -1); // end RLE line
+}
+
+/** Encode frame including header */
+static int encode_frame(QtrleEncContext *s, const AVFrame *p, uint8_t *buf)
+{
+    int i;
+    int start_line = 0;
+    int end_line = s->avctx->height;
+    uint8_t *orig_buf = buf;
+
+    if (!s->frame.key_frame) {
+        unsigned line_size = s->logical_width * s->pixel_size;
+        for (start_line = 0; start_line < s->avctx->height; start_line++)
+            if (memcmp(p->data[0] + start_line*p->linesize[0],
+                       s->previous_frame.data[0] + start_line*s->previous_frame.linesize[0],
+                       line_size))
+                break;
+
+        for (end_line=s->avctx->height; end_line > start_line; end_line--)
+            if (memcmp(p->data[0] + (end_line - 1)*p->linesize[0],
+                       s->previous_frame.data[0] + (end_line - 1)*s->previous_frame.linesize[0],
+                       line_size))
+                break;
+    }
+
+    bytestream_put_be32(&buf, 0);                         // CHUNK SIZE, patched later
+
+    if ((start_line == 0 && end_line == s->avctx->height) || start_line == s->avctx->height)
+        bytestream_put_be16(&buf, 0);                     // header
+    else {
+        bytestream_put_be16(&buf, 8);                     // header
+        bytestream_put_be16(&buf, start_line);            // starting line
+        bytestream_put_be16(&buf, 0);                     // unknown
+        bytestream_put_be16(&buf, end_line - start_line); // lines to update
+        bytestream_put_be16(&buf, 0);                     // unknown
+    }
+    for (i = start_line; i < end_line; i++)
+        qtrle_encode_line(s, p, i, &buf);
+
+    bytestream_put_byte(&buf, 0);                         // zero skip code = frame finished
+    AV_WB32(orig_buf, buf - orig_buf);                    // patch the chunk size
+    return buf - orig_buf;
+}
+
+static int qtrle_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
+                              const AVFrame *pict, int *got_packet)
+{
+    QtrleEncContext * const s = avctx->priv_data;
+    AVFrame * const p = &s->frame;
+    int ret;
+
+    *p = *pict;
+
+    if ((ret = ff_alloc_packet2(avctx, pkt, s->max_buf_size)) < 0)
+        return ret;
+
+    if (avctx->gop_size == 0 || (s->avctx->frame_number % avctx->gop_size) == 0) {
+        /* I-Frame */
+        p->pict_type = AV_PICTURE_TYPE_I;
+        p->key_frame = 1;
+    } else {
+        /* P-Frame */
+        p->pict_type = AV_PICTURE_TYPE_P;
+        p->key_frame = 0;
+    }
+
+    pkt->size = encode_frame(s, pict, pkt->data);
+
+    /* save the current frame */
+    av_picture_copy(&s->previous_frame, (AVPicture *)p, avctx->pix_fmt, avctx->width, avctx->height);
+
+    if (p->key_frame)
+        pkt->flags |= AV_PKT_FLAG_KEY;
+    *got_packet = 1;
+
+    return 0;
+}
+
+static av_cold int qtrle_encode_end(AVCodecContext *avctx)
+{
+    QtrleEncContext *s = avctx->priv_data;
+
+    avpicture_free(&s->previous_frame);
+    av_free(s->rlecode_table);
+    av_free(s->length_table);
+    av_free(s->skip_table);
+    return 0;
+}
+
+AVCodec ff_qtrle_encoder = {
+    .name           = "qtrle",
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_QTRLE,
+    .priv_data_size = sizeof(QtrleEncContext),
+    .init           = qtrle_encode_init,
+    .encode2        = qtrle_encode_frame,
+    .close          = qtrle_encode_end,
+    .pix_fmts       = (const enum AVPixelFormat[]){
+        AV_PIX_FMT_RGB24, AV_PIX_FMT_RGB555BE, AV_PIX_FMT_ARGB, AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE
+    },
+    .long_name      = NULL_IF_CONFIG_SMALL("QuickTime Animation (RLE) video"),
+};