avcodec: add a Sun Rasterfile encoder

Signed-off-by: Justin Ruggles <justin.ruggles@gmail.com>

1 files changed, 225 insertions, 0 deletions

diff --git a/libavcodec/sunrastenc.c b/libavcodec/sunrastenc.c
new file mode 100644
index 0000000000..21d6fc47a0
--- /dev/null
+++ b/libavcodec/sunrastenc.c
@@ -0,0 +1,225 @@
+/*
+ * Sun Rasterfile (.sun/.ras/im{1,8,24}/.sunras) image encoder
+ * Copyright (c) 2012 Aneesh Dogra (lionaneesh) <lionaneesh@gmail.com>
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "avcodec.h"
+#include "bytestream.h"
+#include "internal.h"
+#include "sunrast.h"
+
+typedef struct SUNRASTContext {
+    AVFrame picture;
+    PutByteContext p;
+    int depth;      ///< depth of pixel
+    int length;     ///< length (bytes) of image
+    int type;       ///< type of file
+    int maptype;    ///< type of colormap
+    int maplength;  ///< length (bytes) of colormap
+    int size;
+} SUNRASTContext;
+
+static void sunrast_image_write_header(AVCodecContext *avctx)
+{
+    SUNRASTContext *s = avctx->priv_data;
+
+    bytestream2_put_be32u(&s->p, RAS_MAGIC);
+    bytestream2_put_be32u(&s->p, avctx->width);
+    bytestream2_put_be32u(&s->p, avctx->height);
+    bytestream2_put_be32u(&s->p, s->depth);
+    bytestream2_put_be32u(&s->p, s->length);
+    bytestream2_put_be32u(&s->p, s->type);
+    bytestream2_put_be32u(&s->p, s->maptype);
+    bytestream2_put_be32u(&s->p, s->maplength);
+}
+
+static void sunrast_image_write_image(AVCodecContext *avctx,
+                                      const uint8_t *pixels,
+                                      const uint32_t *palette_data,
+                                      int linesize)
+{
+    SUNRASTContext *s = avctx->priv_data;
+    const uint8_t *ptr;
+    int len, alen, x;
+
+    if (s->maplength) {     // palettized
+        PutByteContext pb_r, pb_g;
+        int len = s->maplength / 3;
+
+        pb_r = s->p;
+        bytestream2_skip_p(&s->p, len);
+        pb_g = s->p;
+        bytestream2_skip_p(&s->p, len);
+
+        for (x = 0; x < len; x++) {
+            uint32_t pixel = palette_data[x];
+
+            bytestream2_put_byteu(&pb_r, (pixel >> 16) & 0xFF);
+            bytestream2_put_byteu(&pb_g, (pixel >> 8)  & 0xFF);
+            bytestream2_put_byteu(&s->p,  pixel        & 0xFF);
+        }
+    }
+
+    len  = (s->depth * avctx->width + 7) >> 3;
+    alen = len + (len & 1);
+    ptr  = pixels;
+
+     if (s->type == RT_BYTE_ENCODED) {
+        uint8_t value, value2;
+        int run;
+        const uint8_t *end = pixels + avctx->height * linesize;
+
+        ptr = pixels;
+
+#define GET_VALUE ptr >= end ? 0 : x >= len ? ptr[len-1] : ptr[x]
+
+        x = 0;
+        value2 = GET_VALUE;
+        while (ptr < end) {
+            run = 1;
+            value = value2;
+            x++;
+            if (x >= alen) {
+                x = 0;
+                ptr += linesize;
+            }
+
+            value2 = GET_VALUE;
+            while (value2 == value && run < 256 && ptr < end) {
+                x++;
+                run++;
+                if (x >= alen) {
+                    x = 0;
+                    ptr += linesize;
+                }
+                value2 = GET_VALUE;
+            }
+
+            if (run > 2 || value == RLE_TRIGGER) {
+                bytestream2_put_byteu(&s->p, RLE_TRIGGER);
+                bytestream2_put_byteu(&s->p, run - 1);
+                if (run > 1)
+                    bytestream2_put_byteu(&s->p, value);
+            } else if (run == 1) {
+                bytestream2_put_byteu(&s->p, value);
+            } else
+                bytestream2_put_be16u(&s->p, (value << 8) | value);
+        }
+
+        // update data length for header
+        s->length = bytestream2_tell_p(&s->p) - 32 - s->maplength;
+    } else {
+        int y;
+        for (y = 0; y < avctx->height; y++) {
+            bytestream2_put_buffer(&s->p, ptr, len);
+            if (len < alen)
+                bytestream2_put_byteu(&s->p, 0);
+            ptr += linesize;
+        }
+    }
+}
+
+static av_cold int sunrast_encode_init(AVCodecContext *avctx)
+{
+    SUNRASTContext *s = avctx->priv_data;
+
+    switch (avctx->coder_type) {
+    case FF_CODER_TYPE_RLE:
+        s->type = RT_BYTE_ENCODED;
+        break;
+    case FF_CODER_TYPE_RAW:
+        s->type = RT_STANDARD;
+        break;
+    default:
+        av_log(avctx, AV_LOG_ERROR, "invalid coder_type\n");
+        return AVERROR(EINVAL);
+    }
+
+    avctx->coded_frame            = &s->picture;
+    avctx->coded_frame->key_frame = 1;
+    avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
+    s->maptype                    = RMT_NONE;
+    s->maplength                  = 0;
+
+    switch (avctx->pix_fmt) {
+    case PIX_FMT_MONOWHITE:
+        s->depth = 1;
+        break;
+    case PIX_FMT_PAL8 :
+        s->maptype   = RMT_EQUAL_RGB;
+        s->maplength = 3 * 256;
+    case PIX_FMT_GRAY8:
+        s->depth = 8;
+        break;
+    case PIX_FMT_BGR24:
+        s->depth = 24;
+        break;
+    default:
+        return AVERROR_BUG;
+    }
+    s->length = avctx->height * (FFALIGN(avctx->width * s->depth, 16) >> 3);
+    s->size   = 32 + s->maplength +
+                s->length * (s->type == RT_BYTE_ENCODED ? 2 : 1);
+
+    return 0;
+}
+
+static int sunrast_encode_frame(AVCodecContext *avctx,  AVPacket *avpkt,
+                                const AVFrame *frame, int *got_packet_ptr)
+{
+    SUNRASTContext *s = avctx->priv_data;
+    int ret;
+
+    if ((ret = ff_alloc_packet(avpkt, s->size)) < 0)
+        return ret;
+
+    bytestream2_init_writer(&s->p, avpkt->data, avpkt->size);
+    sunrast_image_write_header(avctx);
+    sunrast_image_write_image(avctx, frame->data[0],
+                              (const uint32_t *)frame->data[1],
+                              frame->linesize[0]);
+    // update data length in header after RLE
+    if (s->type == RT_BYTE_ENCODED)
+        AV_WB32(&avpkt->data[16], s->length);
+
+    *got_packet_ptr = 1;
+    avpkt->size = bytestream2_tell_p(&s->p);
+    return 0;
+}
+
+static const AVCodecDefault sunrast_defaults[] = {
+     { "coder", "rle" },
+     { NULL },
+};
+
+AVCodec ff_sunrast_encoder = {
+    .name           = "sunrast",
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = CODEC_ID_SUNRAST,
+    .priv_data_size = sizeof(SUNRASTContext),
+    .init           = sunrast_encode_init,
+    .encode2        = sunrast_encode_frame,
+    .defaults       = sunrast_defaults,
+    .pix_fmts       = (const enum PixelFormat[]){ PIX_FMT_BGR24,
+                                                  PIX_FMT_PAL8,
+                                                  PIX_FMT_GRAY8,
+                                                  PIX_FMT_MONOWHITE,
+                                                  PIX_FMT_NONE },
+    .long_name      = NULL_IF_CONFIG_SMALL("Sun Rasterfile image"),
+};