Deluxe Paint Animation decoder

Originally committed as revision 21117 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 197 insertions, 0 deletions

diff --git a/libavcodec/anm.c b/libavcodec/anm.c
new file mode 100644
index 0000000000..963f077194
--- /dev/null
+++ b/libavcodec/anm.c
@@ -0,0 +1,197 @@
+/*
+ * Deluxe Paint Animation decoder
+ * Copyright (c) 2009 Peter Ross
+ *
+ * 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 libavcodec/anm.c
+ * Deluxe Paint Animation decoder
+ */
+
+#include "avcodec.h"
+#include "bytestream.h"
+
+typedef struct AnmContext {
+    AVFrame frame;
+    int x;  ///< x coordinate position
+} AnmContext;
+
+static av_cold int decode_init(AVCodecContext *avctx)
+{
+    AnmContext *s = avctx->priv_data;
+    const uint8_t *buf;
+    int i;
+
+    avctx->pix_fmt = PIX_FMT_PAL8;
+
+    if (avctx->extradata_size != 16*8 + 4*256)
+        return -1;
+
+    s->frame.reference = 1;
+    if (avctx->get_buffer(avctx, &s->frame) < 0) {
+        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+        return -1;
+    }
+
+    buf = avctx->extradata + 16*8;
+    for (i = 0; i < 256; i++)
+        ((uint32_t*)s->frame.data[1])[i] = bytestream_get_le32(&buf);
+
+    return 0;
+}
+
+/**
+ * Perform decode operation
+ * @param dst, dst_end Destination image buffer
+ * @param buf, buf_end Source buffer (optional, see below)
+ * @param pixel Fill color (optional, see below)
+ * @param count Pixel count
+ * @param x Pointer to x-axis counter
+ * @param width Image width
+ * @param linesize Destination image buffer linesize
+ * @return non-zero if destination buffer is exhausted
+ *
+ * a copy operation is achieved when 'buf' is set
+ * a fill operation is acheived when 'buf' is null and pixel is >= 0
+ * a skip operation is acheived when 'buf' is null and pixel is < 0
+ */
+static inline int op(uint8_t **dst, const uint8_t *dst_end,
+                     const uint8_t **buf, const uint8_t *buf_end,
+                     int pixel, int count,
+                     int *x, int width, int linesize)
+{
+    int remaining = width - *x;
+    while(count > 0) {
+        int striplen = FFMIN(count, remaining);
+        if (buf) {
+            striplen = FFMIN(striplen, buf_end - *buf);
+            memcpy(*dst, *buf, striplen);
+            *buf += striplen;
+        } else if (pixel >= 0)
+            memset(*dst, pixel, striplen);
+        *dst      += striplen;
+        remaining -= striplen;
+        count     -= striplen;
+        if (remaining <= 0) {
+            *dst      += linesize - width;
+            remaining  = width;
+        }
+        if (linesize > 0) {
+            if (*dst >= dst_end) goto exhausted;
+        } else {
+            if (*dst <= dst_end) goto exhausted;
+        }
+    }
+    *x = width - remaining;
+    return 0;
+
+exhausted:
+    *x = width - remaining;
+    return 1;
+}
+
+static int decode_frame(AVCodecContext *avctx,
+                        void *data, int *data_size,
+                        AVPacket *avpkt)
+{
+    AnmContext *s = avctx->priv_data;
+    const uint8_t *buf = avpkt->data;
+    const int buf_size = avpkt->size;
+    const uint8_t *buf_end = buf + buf_size;
+    uint8_t *dst, *dst_end;
+    int count;
+
+    if(avctx->reget_buffer(avctx, &s->frame) < 0){
+        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+        return -1;
+    }
+    dst     = s->frame.data[0];
+    dst_end = s->frame.data[0] + s->frame.linesize[0]*avctx->height;
+
+    if (buf[0] != 0x42) {
+        av_log_ask_for_sample(avctx, "unknown record type\n");
+        return buf_size;
+    }
+    if (buf[1]) {
+        av_log_ask_for_sample(avctx, "padding bytes not supported\n");
+        return buf_size;
+    }
+    buf += 4;
+
+    s->x = 0;
+    do {
+        /* if statements are ordered by probability */
+#define OP(buf, pixel, count) \
+    op(&dst, dst_end, (buf), buf_end, (pixel), (count), &s->x, avctx->width, s->frame.linesize[0])
+
+        int type = bytestream_get_byte(&buf);
+        count = type & 0x7F;
+        type >>= 7;
+        if (count) {
+            if (OP(type ? NULL : &buf, -1, count)) break;
+        } else if (!type) {
+            int pixel;
+            count = bytestream_get_byte(&buf);  /* count==0 gives nop */
+            pixel = bytestream_get_byte(&buf);
+            if (OP(NULL, pixel, count)) break;
+        } else {
+            int pixel;
+            type = bytestream_get_le16(&buf);
+            count = type & 0x3FFF;
+            type >>= 14;
+            if (!count) {
+                if (type == 0)
+                    break; // stop
+                if (type == 2) {
+                    av_log_ask_for_sample(avctx, "unknown opcode");
+                    return AVERROR_INVALIDDATA;
+                }
+                continue;
+            }
+            pixel = type == 3 ? bytestream_get_byte(&buf) : -1;
+            if (type == 1) count += 0x4000;
+            if (OP(type == 2 ? &buf : NULL, pixel, count)) break;
+        }
+    } while (buf + 1 < buf_end);
+
+    *data_size = sizeof(AVFrame);
+    *(AVFrame*)data = s->frame;
+    return buf_size;
+}
+
+static av_cold int decode_end(AVCodecContext *avctx)
+{
+    AnmContext *s = avctx->priv_data;
+    if (s->frame.data[0])
+        avctx->release_buffer(avctx, &s->frame);
+    return 0;
+}
+
+AVCodec anm_decoder = {
+    "anm",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_ANM,
+    sizeof(AnmContext),
+    decode_init,
+    NULL,
+    decode_end,
+    decode_frame,
+    CODEC_CAP_DR1,
+    .long_name = NULL_IF_CONFIG_SMALL("Deluxe Paint Animation"),
+};