making act segmenter

1 files changed, 266 insertions, 0 deletions

diff --git a/ffmpeg/libavcodec/dpx.c b/ffmpeg/libavcodec/dpx.c
new file mode 100644
index 0000000..0d60a7e
--- /dev/null
+++ b/ffmpeg/libavcodec/dpx.c
@@ -0,0 +1,266 @@
+/*
+ * DPX (.dpx) image decoder
+ * Copyright (c) 2009 Jimmy Christensen
+ *
+ * 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/intreadwrite.h"
+#include "libavutil/imgutils.h"
+#include "bytestream.h"
+#include "avcodec.h"
+#include "internal.h"
+
+static unsigned int read32(const uint8_t **ptr, int is_big)
+{
+    unsigned int temp;
+    if (is_big) {
+        temp = AV_RB32(*ptr);
+    } else {
+        temp = AV_RL32(*ptr);
+    }
+    *ptr += 4;
+    return temp;
+}
+
+static uint16_t read10in32(const uint8_t **ptr, uint32_t * lbuf,
+                                  int * n_datum, int is_big)
+{
+    if (*n_datum)
+        (*n_datum)--;
+    else {
+        *lbuf = read32(ptr, is_big);
+        *n_datum = 2;
+    }
+
+    *lbuf = (*lbuf << 10) | (*lbuf >> 22);
+
+    return *lbuf & 0x3FF;
+}
+
+static int decode_frame(AVCodecContext *avctx,
+                        void *data,
+                        int *got_frame,
+                        AVPacket *avpkt)
+{
+    const uint8_t *buf = avpkt->data;
+    int buf_size       = avpkt->size;
+    AVFrame *const p = data;
+    uint8_t *ptr[AV_NUM_DATA_POINTERS];
+
+    unsigned int offset;
+    int magic_num, endian;
+    int x, y, i, ret;
+    int w, h, bits_per_color, descriptor, elements, packing, total_size;
+
+    unsigned int rgbBuffer = 0;
+    int n_datum = 0;
+
+    if (avpkt->size <= 1634) {
+        av_log(avctx, AV_LOG_ERROR, "Packet too small for DPX header\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    magic_num = AV_RB32(buf);
+    buf += 4;
+
+    /* Check if the files "magic number" is "SDPX" which means it uses
+     * big-endian or XPDS which is for little-endian files */
+    if (magic_num == AV_RL32("SDPX")) {
+        endian = 0;
+    } else if (magic_num == AV_RB32("SDPX")) {
+        endian = 1;
+    } else {
+        av_log(avctx, AV_LOG_ERROR, "DPX marker not found\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    offset = read32(&buf, endian);
+    if (avpkt->size <= offset) {
+        av_log(avctx, AV_LOG_ERROR, "Invalid data start offset\n");
+        return AVERROR_INVALIDDATA;
+    }
+    // Need to end in 0x304 offset from start of file
+    buf = avpkt->data + 0x304;
+    w = read32(&buf, endian);
+    h = read32(&buf, endian);
+    if ((ret = av_image_check_size(w, h, 0, avctx)) < 0)
+        return ret;
+
+    if (w != avctx->width || h != avctx->height)
+        avcodec_set_dimensions(avctx, w, h);
+
+    // Need to end in 0x320 to read the descriptor
+    buf += 20;
+    descriptor = buf[0];
+
+    // Need to end in 0x323 to read the bits per color
+    buf += 3;
+    avctx->bits_per_raw_sample =
+    bits_per_color = buf[0];
+    buf++;
+    packing = *((uint16_t*)buf);
+
+    buf += 824;
+    avctx->sample_aspect_ratio.num = read32(&buf, endian);
+    avctx->sample_aspect_ratio.den = read32(&buf, endian);
+    if (avctx->sample_aspect_ratio.num > 0 && avctx->sample_aspect_ratio.den > 0)
+        av_reduce(&avctx->sample_aspect_ratio.num, &avctx->sample_aspect_ratio.den,
+                   avctx->sample_aspect_ratio.num,  avctx->sample_aspect_ratio.den,
+                  0x10000);
+    else
+        avctx->sample_aspect_ratio = (AVRational){ 0, 1 };
+
+    switch (descriptor) {
+        case 51: // RGBA
+            elements = 4;
+            break;
+        case 50: // RGB
+            elements = 3;
+            break;
+        default:
+            av_log(avctx, AV_LOG_ERROR, "Unsupported descriptor %d\n", descriptor);
+            return AVERROR_INVALIDDATA;
+    }
+
+    switch (bits_per_color) {
+        case 8:
+            if (elements == 4) {
+                avctx->pix_fmt = AV_PIX_FMT_RGBA;
+            } else {
+                avctx->pix_fmt = AV_PIX_FMT_RGB24;
+            }
+            total_size = avctx->width * avctx->height * elements;
+            break;
+        case 10:
+            if (!packing) {
+                av_log(avctx, AV_LOG_ERROR, "Packing to 32bit required\n");
+                return -1;
+            }
+            avctx->pix_fmt = AV_PIX_FMT_GBRP10;
+            total_size = (avctx->width * avctx->height * elements + 2) / 3 * 4;
+            break;
+        case 12:
+            if (!packing) {
+                av_log(avctx, AV_LOG_ERROR, "Packing to 16bit required\n");
+                return -1;
+            }
+            if (endian) {
+                avctx->pix_fmt = AV_PIX_FMT_GBRP12BE;
+            } else {
+                avctx->pix_fmt = AV_PIX_FMT_GBRP12LE;
+            }
+            total_size = 2 * avctx->width * avctx->height * elements;
+            break;
+        case 16:
+            if (endian) {
+                avctx->pix_fmt = elements == 4 ? AV_PIX_FMT_RGBA64BE : AV_PIX_FMT_RGB48BE;
+            } else {
+                avctx->pix_fmt = elements == 4 ? AV_PIX_FMT_RGBA64LE : AV_PIX_FMT_RGB48LE;
+            }
+            total_size = 2 * avctx->width * avctx->height * elements;
+            break;
+        default:
+            av_log(avctx, AV_LOG_ERROR, "Unsupported color depth : %d\n", bits_per_color);
+            return AVERROR_INVALIDDATA;
+    }
+
+    if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
+        return ret;
+
+    // Move pointer to offset from start of file
+    buf =  avpkt->data + offset;
+
+    for (i=0; i<AV_NUM_DATA_POINTERS; i++)
+        ptr[i] = p->data[i];
+
+    if (total_size + (int64_t)offset > avpkt->size) {
+        av_log(avctx, AV_LOG_ERROR, "Overread buffer. Invalid header?\n");
+        return AVERROR_INVALIDDATA;
+    }
+    switch (bits_per_color) {
+    case 10:
+        for (x = 0; x < avctx->height; x++) {
+            uint16_t *dst[3] = {(uint16_t*)ptr[0],
+                                (uint16_t*)ptr[1],
+                                (uint16_t*)ptr[2]};
+            for (y = 0; y < avctx->width; y++) {
+                *dst[2]++ = read10in32(&buf, &rgbBuffer,
+                                       &n_datum, endian);
+                *dst[0]++ = read10in32(&buf, &rgbBuffer,
+                                       &n_datum, endian);
+                *dst[1]++ = read10in32(&buf, &rgbBuffer,
+                                       &n_datum, endian);
+                // For 10 bit, ignore alpha
+                if (elements == 4)
+                    read10in32(&buf, &rgbBuffer,
+                               &n_datum, endian);
+            }
+            for (i = 0; i < 3; i++)
+                ptr[i] += p->linesize[i];
+        }
+        break;
+    case 12:
+        for (x = 0; x < avctx->height; x++) {
+            uint16_t *dst[3] = {(uint16_t*)ptr[0],
+                                (uint16_t*)ptr[1],
+                                (uint16_t*)ptr[2]};
+            for (y = 0; y < avctx->width; y++) {
+                *dst[2] = *((uint16_t*)buf);
+                *dst[2] = (*dst[2] >> 4) | (*dst[2] << 12);
+                dst[2]++;
+                buf += 2;
+                *dst[0] = *((uint16_t*)buf);
+                *dst[0] = (*dst[0] >> 4) | (*dst[0] << 12);
+                dst[0]++;
+                buf += 2;
+                *dst[1] = *((uint16_t*)buf);
+                *dst[1] = (*dst[1] >> 4) | (*dst[1] << 12);
+                dst[1]++;
+                buf += 2;
+                // For 12 bit, ignore alpha
+                if (elements == 4)
+                    buf += 2;
+            }
+            for (i = 0; i < 3; i++)
+                ptr[i] += p->linesize[i];
+        }
+        break;
+    case 16:
+        elements *= 2;
+    case 8:
+        for (x = 0; x < avctx->height; x++) {
+            memcpy(ptr[0], buf, elements*avctx->width);
+            ptr[0] += p->linesize[0];
+            buf += elements*avctx->width;
+        }
+        break;
+    }
+
+    *got_frame = 1;
+
+    return buf_size;
+}
+
+AVCodec ff_dpx_decoder = {
+    .name           = "dpx",
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_DPX,
+    .decode         = decode_frame,
+    .long_name      = NULL_IF_CONFIG_SMALL("DPX image"),
+    .capabilities   = CODEC_CAP_DR1,
+};