Mirillis FIC video decoder

Does not contain cursor rendering yet.

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

1 files changed, 298 insertions, 0 deletions

diff --git a/libavcodec/fic.c b/libavcodec/fic.c
new file mode 100644
index 0000000000..9a3bc3eb9c
--- /dev/null
+++ b/libavcodec/fic.c
@@ -0,0 +1,298 @@
+/*
+ * Mirillis FIC decoder
+ *
+ * Copyright (c) 2014 Konstantin Shishkov
+ * Copyright (c) 2014 Derek Buitenhuis
+ *
+ * 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 "libavutil/common.h"
+#include "avcodec.h"
+#include "internal.h"
+#include "dsputil.h"
+#include "get_bits.h"
+#include "golomb.h"
+
+typedef struct FICThreadContext {
+    DECLARE_ALIGNED(16, int16_t, block)[64];
+    uint8_t *src;
+    int slice_h;
+    int src_size;
+    int y_off;
+} FICThreadContext;
+
+typedef struct FICContext {
+    AVCodecContext *avctx;
+    AVFrame *frame;
+
+    DSPContext dsp;
+    ScanTable scantable;
+
+    FICThreadContext *slice_data;
+    int slice_data_size;
+
+    const uint8_t *qmat;
+
+    enum AVPictureType cur_frame_type;
+
+    int aligned_width, aligned_height;
+    int num_slices, slice_h;
+} FICContext;
+
+static const uint8_t fic_qmat_hq[64] = {
+    1, 2, 2, 2, 3, 3, 3, 4,
+    2, 2, 2, 3, 3, 3, 4, 4,
+    2, 2, 3, 3, 3, 4, 4, 4,
+    2, 2, 3, 3, 3, 4, 4, 5,
+    2, 3, 3, 3, 4, 4, 5, 6,
+    3, 3, 3, 4, 4, 5, 6, 7,
+    3, 3, 3, 4, 4, 5, 7, 7,
+    3, 3, 4, 4, 5, 7, 7, 7,
+};
+
+static const uint8_t fic_qmat_lq[64] = {
+    1,  5,  6,  7,  8,  9,  9, 11,
+    5,  5,  7,  8,  9,  9, 11, 12,
+    6,  7,  8,  9,  9, 11, 11, 12,
+    7,  7,  8,  9,  9, 11, 12, 13,
+    7,  8,  9,  9, 10, 11, 13, 16,
+    8,  9,  9, 10, 11, 13, 16, 19,
+    8,  9,  9, 11, 12, 15, 18, 23,
+    9,  9, 11, 12, 15, 18, 23, 27
+};
+
+static const uint8_t fic_header[7] = { 0, 0, 1, 'F', 'I', 'C', 'V' };
+
+#define FIC_HEADER_SIZE 27
+
+static int fic_decode_block(FICContext *ctx, GetBitContext *gb,
+                            uint8_t *dst, int stride, int16_t *block)
+{
+    int i, num_coeff;
+
+    /* Is it a skip block? */
+    if (get_bits1(gb)) {
+        /* This is a P-frame. */
+        ctx->frame->key_frame = 0;
+        ctx->frame->pict_type = AV_PICTURE_TYPE_P;
+
+        return 0;
+    }
+
+    ctx->dsp.clear_block(block);
+
+    num_coeff = get_bits(gb, 7);
+    if (num_coeff > 64)
+        return AVERROR_INVALIDDATA;
+
+    for (i = 0; i < num_coeff; i++)
+        block[ctx->scantable.permutated[i]] = get_se_golomb(gb) * ctx->qmat[i];
+
+    ctx->dsp.idct_put(dst, stride, block);
+
+    return 0;
+}
+
+static int fic_decode_slice(AVCodecContext *avctx, void *tdata)
+{
+    FICContext *ctx        = avctx->priv_data;
+    FICThreadContext *tctx = tdata;
+    GetBitContext gb;
+    uint8_t *src = tctx->src;
+    int slice_h  = tctx->slice_h;
+    int src_size = tctx->src_size;
+    int y_off    = tctx->y_off;
+    int x, y, p;
+
+    init_get_bits(&gb, src, src_size * 8);
+
+    for (p = 0; p < 3; p++) {
+        int stride   = ctx->frame->linesize[p];
+        uint8_t* dst = ctx->frame->data[p] + (y_off >> !!p) * stride;
+
+        for (y = 0; y < (slice_h >> !!p); y += 8) {
+            for (x = 0; x < (ctx->aligned_width >> !!p); x += 8) {
+                int ret;
+
+                if ((ret = fic_decode_block(ctx, &gb, dst + x, stride, tctx->block)) != 0)
+                    return ret;
+            }
+
+            dst += 8 * stride;
+        }
+    }
+
+    return 0;
+}
+
+static int fic_decode_frame(AVCodecContext *avctx, void *data,
+                            int *got_frame, AVPacket *avpkt)
+{
+    FICContext *ctx = avctx->priv_data;
+    uint8_t *src = avpkt->data;
+    int ret;
+    int slice, nslices;
+    int msize;
+    int tsize;
+    uint8_t *sdata;
+
+    if ((ret = ff_reget_buffer(avctx, ctx->frame)) < 0) {
+        av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
+        return ret;
+    }
+
+    /* Header + at least one slice (4) */
+    if (avpkt->size < FIC_HEADER_SIZE + 4) {
+        av_log(avctx, AV_LOG_ERROR, "Frame data is too small.\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    /* Check for header. */
+    if (memcmp(src, fic_header, 7))
+        av_log(avctx, AV_LOG_WARNING, "Invalid FIC Header.\n");
+
+    nslices = src[13];
+    if (!nslices) {
+        av_log(avctx, AV_LOG_ERROR, "Zero slices found.\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    /* High or Low Quality Matrix? */
+    ctx->qmat = src[23] ? fic_qmat_hq : fic_qmat_lq;
+
+    /* Skip cursor data. */
+    tsize = AV_RB24(src + 24);
+    if (tsize > avpkt->size - FIC_HEADER_SIZE) {
+        av_log(avctx, AV_LOG_ERROR, "Invalid cursor data size.\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    /* Slice height for all but the last slice. */
+    ctx->slice_h = 16 * (ctx->aligned_height >> 4) / nslices;
+    if (ctx->slice_h % 16)
+        ctx->slice_h = FFALIGN(ctx->slice_h - 16, 16);
+
+    /* First slice offset and remaining data. */
+    sdata = src + tsize + FIC_HEADER_SIZE + 4 * nslices;
+    msize = avpkt->size - nslices * 4 - tsize - FIC_HEADER_SIZE;
+
+    if (msize <= 0) {
+        av_log(avctx, AV_LOG_ERROR, "Not enough frame data to decode.\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    /*
+     * Set the frametype to I initially. It will be set to P if the frame
+     * has any dependencies (skip blocks). There will be a race condition
+     * inside the slice decode function to set these, but we do not care.
+     * since they will only ever be set to 0/P.
+     */
+    ctx->frame->key_frame = 1;
+    ctx->frame->pict_type = AV_PICTURE_TYPE_I;
+
+    /* Allocate slice data. */
+    av_fast_malloc(&ctx->slice_data, &ctx->slice_data_size,
+                   nslices * sizeof(ctx->slice_data[0]));
+    if (!ctx->slice_data_size) {
+        av_log(avctx, AV_LOG_ERROR, "Could not allocate slice data.\n");
+        return AVERROR(ENOMEM);
+    }
+
+    for (slice = 0; slice < nslices; slice++) {
+        int slice_off = AV_RB32(src + tsize + FIC_HEADER_SIZE + slice * 4);
+        int slice_size;
+        int y_off   = ctx->slice_h * slice;
+        int slice_h = ctx->slice_h;
+
+        /*
+         * Either read the slice size, or consume all data left.
+         * Also, special case the last slight height.
+         */
+        if (slice == nslices - 1) {
+            slice_size   = msize;
+            slice_h      = FFALIGN(avctx->height - ctx->slice_h * (nslices - 1), 16);
+        } else {
+            slice_size = AV_RB32(src + tsize + FIC_HEADER_SIZE + slice * 4 + 4);
+        }
+
+        slice_size -= slice_off;
+
+        if (slice_off > msize || slice_off + slice_size > msize)
+            continue;
+
+        ctx->slice_data[slice].src      = sdata + slice_off;
+        ctx->slice_data[slice].src_size = slice_size;
+        ctx->slice_data[slice].slice_h  = slice_h;
+        ctx->slice_data[slice].y_off    = y_off;
+    }
+
+    if (ret = avctx->execute(avctx, fic_decode_slice, ctx->slice_data,
+                             NULL, nslices, sizeof(ctx->slice_data[0])) < 0)
+        return ret;
+
+    *got_frame = 1;
+    if ((ret = av_frame_ref(data, ctx->frame)) < 0)
+        return ret;
+
+    return avpkt->size;
+}
+
+static av_cold int fic_decode_close(AVCodecContext *avctx)
+{
+    FICContext *ctx = avctx->priv_data;
+
+    av_freep(&ctx->slice_data);
+    av_frame_free(&ctx->frame);
+
+    return 0;
+}
+
+static av_cold int fic_decode_init(AVCodecContext *avctx)
+{
+    FICContext *ctx = avctx->priv_data;
+
+    /* Initialize various context values */
+    ctx->avctx            = avctx;
+    ctx->aligned_width    = FFALIGN(avctx->width,  16);
+    ctx->aligned_height   = FFALIGN(avctx->height, 16);
+
+    avctx->pix_fmt             = AV_PIX_FMT_YUV420P;
+    avctx->bits_per_raw_sample = 8;
+
+    ctx->frame = av_frame_alloc();
+    if (!ctx->frame)
+        return AVERROR(ENOMEM);
+
+    ff_dsputil_init(&ctx->dsp, avctx);
+
+    ff_init_scantable(ctx->dsp.idct_permutation, &ctx->scantable, ff_zigzag_direct);
+
+    return 0;
+}
+
+AVCodec ff_fic_decoder = {
+    .name           = "fic",
+    .long_name      = NULL_IF_CONFIG_SMALL("Mirillis FIC"),
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_FIC,
+    .priv_data_size = sizeof(FICContext),
+    .init           = fic_decode_init,
+    .decode         = fic_decode_frame,
+    .close          = fic_decode_close,
+    .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_SLICE_THREADS,
+};