dsicin: Split audio and video decoder

Signed-off-by: Diego Biurrun <diego@biurrun.de>

1 files changed, 301 insertions, 0 deletions

diff --git a/libavcodec/dsicinvideo.c b/libavcodec/dsicinvideo.c
new file mode 100644
index 0000000000..b56a581ea3
--- /dev/null
+++ b/libavcodec/dsicinvideo.c
@@ -0,0 +1,301 @@
+/*
+ * Delphine Software International CIN video decoder
+ * Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net)
+ *
+ * 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
+ */
+
+/**
+ * @file
+ * Delphine Software International CIN video decoder
+ */
+
+#include "avcodec.h"
+#include "bytestream.h"
+#include "internal.h"
+
+typedef enum CinVideoBitmapIndex {
+    CIN_CUR_BMP = 0, /* current */
+    CIN_PRE_BMP = 1, /* previous */
+    CIN_INT_BMP = 2  /* intermediate */
+} CinVideoBitmapIndex;
+
+typedef struct CinVideoContext {
+    AVCodecContext *avctx;
+    AVFrame *frame;
+    unsigned int bitmap_size;
+    uint32_t palette[256];
+    uint8_t *bitmap_table[3];
+} CinVideoContext;
+
+static av_cold int cinvideo_decode_init(AVCodecContext *avctx)
+{
+    CinVideoContext *cin = avctx->priv_data;
+    unsigned int i;
+
+    cin->avctx = avctx;
+    avctx->pix_fmt = AV_PIX_FMT_PAL8;
+
+    cin->frame = av_frame_alloc();
+    if (!cin->frame)
+        return AVERROR(ENOMEM);
+
+    cin->bitmap_size = avctx->width * avctx->height;
+    for (i = 0; i < 3; ++i) {
+        cin->bitmap_table[i] = av_mallocz(cin->bitmap_size);
+        if (!cin->bitmap_table[i])
+            av_log(avctx, AV_LOG_ERROR, "Can't allocate bitmap buffers.\n");
+    }
+
+    return 0;
+}
+
+static void cin_apply_delta_data(const unsigned char *src, unsigned char *dst,
+                                 int size)
+{
+    while (size--)
+        *dst++ += *src++;
+}
+
+static int cin_decode_huffman(const unsigned char *src, int src_size,
+                              unsigned char *dst, int dst_size)
+{
+    int b, huff_code = 0;
+    unsigned char huff_code_table[15];
+    unsigned char *dst_cur       = dst;
+    unsigned char *dst_end       = dst + dst_size;
+    const unsigned char *src_end = src + src_size;
+
+    memcpy(huff_code_table, src, 15);
+    src += 15;
+
+    while (src < src_end) {
+        huff_code = *src++;
+        if ((huff_code >> 4) == 15) {
+            b          = huff_code << 4;
+            huff_code  = *src++;
+            *dst_cur++ = b | (huff_code >> 4);
+        } else
+            *dst_cur++ = huff_code_table[huff_code >> 4];
+        if (dst_cur >= dst_end)
+            break;
+
+        huff_code &= 15;
+        if (huff_code == 15) {
+            *dst_cur++ = *src++;
+        } else
+            *dst_cur++ = huff_code_table[huff_code];
+        if (dst_cur >= dst_end)
+            break;
+    }
+
+    return dst_cur - dst;
+}
+
+static int cin_decode_lzss(const unsigned char *src, int src_size,
+                           unsigned char *dst, int dst_size)
+{
+    uint16_t cmd;
+    int i, sz, offset, code;
+    unsigned char *dst_end       = dst + dst_size, *dst_start = dst;
+    const unsigned char *src_end = src + src_size;
+
+    while (src < src_end && dst < dst_end) {
+        code = *src++;
+        for (i = 0; i < 8 && src < src_end && dst < dst_end; ++i) {
+            if (code & (1 << i)) {
+                *dst++ = *src++;
+            } else {
+                cmd    = AV_RL16(src);
+                src   += 2;
+                offset = cmd >> 4;
+                if ((int)(dst - dst_start) < offset + 1)
+                    return AVERROR_INVALIDDATA;
+                sz = (cmd & 0xF) + 2;
+                /* don't use memcpy/memmove here as the decoding routine
+                 * (ab)uses buffer overlappings to repeat bytes in the
+                 * destination */
+                sz = FFMIN(sz, dst_end - dst);
+                while (sz--) {
+                    *dst = *(dst - offset - 1);
+                    ++dst;
+                }
+            }
+        }
+    }
+
+    return 0;
+}
+
+static void cin_decode_rle(const unsigned char *src, int src_size,
+                           unsigned char *dst, int dst_size)
+{
+    int len, code;
+    unsigned char *dst_end       = dst + dst_size;
+    const unsigned char *src_end = src + src_size;
+
+    while (src < src_end && dst < dst_end) {
+        code = *src++;
+        if (code & 0x80) {
+            if (src >= src_end)
+                break;
+            len = code - 0x7F;
+            memset(dst, *src++, FFMIN(len, dst_end - dst));
+        } else {
+            len = code + 1;
+            memcpy(dst, src, FFMIN3(len, dst_end - dst, src_end - src));
+            src += len;
+        }
+        dst += len;
+    }
+}
+
+static int cinvideo_decode_frame(AVCodecContext *avctx,
+                                 void *data, int *got_frame,
+                                 AVPacket *avpkt)
+{
+    const uint8_t *buf   = avpkt->data;
+    int buf_size         = avpkt->size;
+    CinVideoContext *cin = avctx->priv_data;
+    int i, y, palette_type, palette_colors_count,
+        bitmap_frame_type, bitmap_frame_size, res = 0;
+
+    palette_type         = buf[0];
+    palette_colors_count = AV_RL16(buf + 1);
+    bitmap_frame_type    = buf[3];
+    buf                 += 4;
+
+    bitmap_frame_size = buf_size - 4;
+
+    /* handle palette */
+    if (bitmap_frame_size < palette_colors_count * (3 + (palette_type != 0)))
+        return AVERROR_INVALIDDATA;
+    if (palette_type == 0) {
+        if (palette_colors_count > 256)
+            return AVERROR_INVALIDDATA;
+        for (i = 0; i < palette_colors_count; ++i) {
+            cin->palette[i]    = bytestream_get_le24(&buf);
+            bitmap_frame_size -= 3;
+        }
+    } else {
+        for (i = 0; i < palette_colors_count; ++i) {
+            cin->palette[buf[0]] = AV_RL24(buf + 1);
+            buf                 += 4;
+            bitmap_frame_size   -= 4;
+        }
+    }
+
+    bitmap_frame_size = FFMIN(cin->bitmap_size, bitmap_frame_size);
+
+    /* note: the decoding routines below assumes that
+     * surface.width = surface.pitch */
+    switch (bitmap_frame_type) {
+    case 9:
+        cin_decode_rle(buf, bitmap_frame_size,
+                       cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
+        break;
+    case 34:
+        cin_decode_rle(buf, bitmap_frame_size,
+                       cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
+        cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],
+                             cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
+        break;
+    case 35:
+        cin_decode_huffman(buf, bitmap_frame_size,
+                           cin->bitmap_table[CIN_INT_BMP], cin->bitmap_size);
+        cin_decode_rle(cin->bitmap_table[CIN_INT_BMP], bitmap_frame_size,
+                       cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
+        break;
+    case 36:
+        bitmap_frame_size = cin_decode_huffman(buf, bitmap_frame_size,
+                                               cin->bitmap_table[CIN_INT_BMP],
+                                               cin->bitmap_size);
+        cin_decode_rle(cin->bitmap_table[CIN_INT_BMP], bitmap_frame_size,
+                       cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
+        cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],
+                             cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
+        break;
+    case 37:
+        cin_decode_huffman(buf, bitmap_frame_size,
+                           cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
+        break;
+    case 38:
+        res = cin_decode_lzss(buf, bitmap_frame_size,
+                              cin->bitmap_table[CIN_CUR_BMP],
+                              cin->bitmap_size);
+        if (res < 0)
+            return res;
+        break;
+    case 39:
+        res = cin_decode_lzss(buf, bitmap_frame_size,
+                              cin->bitmap_table[CIN_CUR_BMP],
+                              cin->bitmap_size);
+        if (res < 0)
+            return res;
+        cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],
+                             cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
+        break;
+    }
+
+    if ((res = ff_reget_buffer(avctx, cin->frame)) < 0) {
+        av_log(cin->avctx, AV_LOG_ERROR,
+               "delphinecinvideo: reget_buffer() failed to allocate a frame\n");
+        return res;
+    }
+
+    memcpy(cin->frame->data[1], cin->palette, sizeof(cin->palette));
+    cin->frame->palette_has_changed = 1;
+    for (y = 0; y < cin->avctx->height; ++y)
+        memcpy(cin->frame->data[0] + (cin->avctx->height - 1 - y) * cin->frame->linesize[0],
+               cin->bitmap_table[CIN_CUR_BMP] + y * cin->avctx->width,
+               cin->avctx->width);
+
+    FFSWAP(uint8_t *, cin->bitmap_table[CIN_CUR_BMP],
+                      cin->bitmap_table[CIN_PRE_BMP]);
+
+    if ((res = av_frame_ref(data, cin->frame)) < 0)
+        return res;
+
+    *got_frame = 1;
+
+    return buf_size;
+}
+
+static av_cold int cinvideo_decode_end(AVCodecContext *avctx)
+{
+    CinVideoContext *cin = avctx->priv_data;
+    int i;
+
+    av_frame_free(&cin->frame);
+
+    for (i = 0; i < 3; ++i)
+        av_free(cin->bitmap_table[i]);
+
+    return 0;
+}
+
+AVCodec ff_dsicinvideo_decoder = {
+    .name           = "dsicinvideo",
+    .long_name      = NULL_IF_CONFIG_SMALL("Delphine Software International CIN video"),
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_DSICINVIDEO,
+    .priv_data_size = sizeof(CinVideoContext),
+    .init           = cinvideo_decode_init,
+    .close          = cinvideo_decode_end,
+    .decode         = cinvideo_decode_frame,
+    .capabilities   = CODEC_CAP_DR1,
+};