Escape 130 (RPL) decoder

Some fixes provided by Paul B Mahol <onemda@gmail.com>
and Michael Niedermayer <michaelni@gmx.at> and me.

Signed-off-by: Diego Biurrun <diego@biurrun.de>
Signed-off-by: Kostya Shishkov <kostya.shishkov@gmail.com>

1 files changed, 356 insertions, 0 deletions

diff --git a/libavcodec/escape130.c b/libavcodec/escape130.c
new file mode 100644
index 0000000000..3e3f7e1565
--- /dev/null
+++ b/libavcodec/escape130.c
@@ -0,0 +1,356 @@
+/*
+ * Escape 130 video decoder
+ * Copyright (C) 2008 Eli Friedman (eli.friedman <at> 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 "libavutil/attributes.h"
+#include "libavutil/mem.h"
+#include "avcodec.h"
+#define BITSTREAM_READER_LE
+#include "get_bits.h"
+#include "internal.h"
+
+typedef struct Escape130Context {
+    uint8_t *old_y_avg;
+
+    uint8_t *new_y, *old_y;
+    uint8_t *new_u, *old_u;
+    uint8_t *new_v, *old_v;
+
+    uint8_t *buf1, *buf2;
+    int     linesize[3];
+} Escape130Context;
+
+static const uint8_t offset_table[] = { 2, 4, 10, 20 };
+static const int8_t sign_table[64][4] = {
+    {  0,  0,  0,  0 },
+    { -1,  1,  0,  0 },
+    {  1, -1,  0,  0 },
+    { -1,  0,  1,  0 },
+    { -1,  1,  1,  0 },
+    {  0, -1,  1,  0 },
+    {  1, -1,  1,  0 },
+    { -1, -1,  1,  0 },
+    {  1,  0, -1,  0 },
+    {  0,  1, -1,  0 },
+    {  1,  1, -1,  0 },
+    { -1,  1, -1,  0 },
+    {  1, -1, -1,  0 },
+    { -1,  0,  0,  1 },
+    { -1,  1,  0,  1 },
+    {  0, -1,  0,  1 },
+
+    {  0,  0,  0,  0 },
+    {  1, -1,  0,  1 },
+    { -1, -1,  0,  1 },
+    { -1,  0,  1,  1 },
+    { -1,  1,  1,  1 },
+    {  0, -1,  1,  1 },
+    {  1, -1,  1,  1 },
+    { -1, -1,  1,  1 },
+    {  0,  0, -1,  1 },
+    {  1,  0, -1,  1 },
+    { -1,  0, -1,  1 },
+    {  0,  1, -1,  1 },
+    {  1,  1, -1,  1 },
+    { -1,  1, -1,  1 },
+    {  0, -1, -1,  1 },
+    {  1, -1, -1,  1 },
+
+    {  0,  0,  0,  0 },
+    { -1, -1, -1,  1 },
+    {  1,  0,  0, -1 },
+    {  0,  1,  0, -1 },
+    {  1,  1,  0, -1 },
+    { -1,  1,  0, -1 },
+    {  1, -1,  0, -1 },
+    {  0,  0,  1, -1 },
+    {  1,  0,  1, -1 },
+    { -1,  0,  1, -1 },
+    {  0,  1,  1, -1 },
+    {  1,  1,  1, -1 },
+    { -1,  1,  1, -1 },
+    {  0, -1,  1, -1 },
+    {  1, -1,  1, -1 },
+    { -1, -1,  1, -1 },
+
+    {  0,  0,  0,  0 },
+    {  1,  0, -1, -1 },
+    {  0,  1, -1, -1 },
+    {  1,  1, -1, -1 },
+    { -1,  1, -1, -1 },
+    {  1, -1, -1, -1 }
+};
+
+static const int8_t luma_adjust[] = { -4, -3, -2, -1, 1, 2, 3, 4 };
+
+static const int8_t chroma_adjust[2][8] = {
+    { 1, 1, 0, -1, -1, -1,  0,  1 },
+    { 0, 1, 1,  1,  0, -1, -1, -1 }
+};
+
+const uint8_t chroma_vals[] = {
+     20,  28,  36,  44,  52,  60,  68,  76,
+     84,  92, 100, 106, 112, 116, 120, 124,
+    128, 132, 136, 140, 144, 150, 156, 164,
+    172, 180, 188, 196, 204, 212, 220, 228
+};
+
+static av_cold int escape130_decode_init(AVCodecContext *avctx)
+{
+    Escape130Context *s = avctx->priv_data;
+    avctx->pix_fmt = PIX_FMT_YUV420P;
+
+    if ((avctx->width & 1) || (avctx->height & 1)) {
+        av_log(avctx, AV_LOG_ERROR,
+               "Dimensions should be a multiple of two.\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    s->old_y_avg = av_malloc(avctx->width * avctx->height / 4);
+    s->buf1      = av_malloc(avctx->width * avctx->height * 3 / 2);
+    s->buf2      = av_malloc(avctx->width * avctx->height * 3 / 2);
+    if (!s->old_y_avg || !s->buf1 || !s->buf2) {
+        av_freep(&s->old_y_avg);
+        av_freep(&s->buf1);
+        av_freep(&s->buf2);
+        av_log(avctx, AV_LOG_ERROR, "Could not allocate buffer.\n");
+        return AVERROR(ENOMEM);
+    }
+
+    s->linesize[0] = avctx->width;
+    s->linesize[1] =
+    s->linesize[2] = avctx->width / 2;
+
+    s->new_y = s->buf1;
+    s->new_u = s->new_y + avctx->width * avctx->height;
+    s->new_v = s->new_u + avctx->width * avctx->height / 4;
+    s->old_y = s->buf2;
+    s->old_u = s->old_y + avctx->width * avctx->height;
+    s->old_v = s->old_u + avctx->width * avctx->height / 4;
+    memset(s->old_y, 0,    avctx->width * avctx->height);
+    memset(s->old_u, 0x10, avctx->width * avctx->height / 4);
+    memset(s->old_v, 0x10, avctx->width * avctx->height / 4);
+
+    return 0;
+}
+
+static av_cold int escape130_decode_close(AVCodecContext *avctx)
+{
+    Escape130Context *s = avctx->priv_data;
+
+    av_freep(&s->old_y_avg);
+    av_freep(&s->buf1);
+    av_freep(&s->buf2);
+
+    return 0;
+}
+
+static int decode_skip_count(GetBitContext* gb)
+{
+    int value;
+
+    value = get_bits1(gb);
+    if (value)
+        return 0;
+
+    value = get_bits(gb, 3);
+    if (value)
+        return value;
+
+    value = get_bits(gb, 8);
+    if (value)
+        return value + 7;
+
+    value = get_bits(gb, 15);
+    if (value)
+        return value + 262;
+
+    return -1;
+}
+
+static int escape130_decode_frame(AVCodecContext *avctx, void *data,
+                                  int *got_frame, AVPacket *avpkt)
+{
+    const uint8_t *buf  = avpkt->data;
+    int buf_size        = avpkt->size;
+    Escape130Context *s = avctx->priv_data;
+    AVFrame *pic        = data;
+    GetBitContext gb;
+    int ret;
+
+    uint8_t *old_y, *old_cb, *old_cr,
+            *new_y, *new_cb, *new_cr;
+    uint8_t *dstY, *dstU, *dstV;
+    unsigned old_y_stride, old_cb_stride, old_cr_stride,
+             new_y_stride, new_cb_stride, new_cr_stride;
+    unsigned total_blocks = avctx->width * avctx->height / 4,
+             block_index, block_x = 0;
+    unsigned y[4] = { 0 }, cb = 0x10, cr = 0x10;
+    int skip = -1, y_avg = 0, i, j;
+    uint8_t *ya = s->old_y_avg;
+
+    // first 16 bytes are header; no useful information in here
+    if (buf_size <= 16) {
+        av_log(avctx, AV_LOG_ERROR, "Insufficient frame data\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
+        return ret;
+
+    init_get_bits(&gb, buf + 16, (buf_size - 16) * 8);
+
+    new_y  = s->new_y;
+    new_cb = s->new_u;
+    new_cr = s->new_v;
+    new_y_stride  = s->linesize[0];
+    new_cb_stride = s->linesize[1];
+    new_cr_stride = s->linesize[2];
+    old_y  = s->old_y;
+    old_cb = s->old_u;
+    old_cr = s->old_v;
+    old_y_stride  = s->linesize[0];
+    old_cb_stride = s->linesize[1];
+    old_cr_stride = s->linesize[2];
+
+    for (block_index = 0; block_index < total_blocks; block_index++) {
+        // Note that this call will make us skip the rest of the blocks
+        // if the frame ends prematurely.
+        if (skip == -1)
+            skip = decode_skip_count(&gb);
+        if (skip == -1) {
+            av_log(avctx, AV_LOG_ERROR, "Error decoding skip value\n");
+            return AVERROR_INVALIDDATA;
+        }
+
+        if (skip) {
+            y[0] = old_y[0];
+            y[1] = old_y[1];
+            y[2] = old_y[old_y_stride];
+            y[3] = old_y[old_y_stride + 1];
+            y_avg = ya[0];
+            cb = old_cb[0];
+            cr = old_cr[0];
+        } else {
+            if (get_bits1(&gb)) {
+                unsigned sign_selector       = get_bits(&gb, 6);
+                unsigned difference_selector = get_bits(&gb, 2);
+                y_avg = 2 * get_bits(&gb, 5);
+                for (i = 0; i < 4; i++) {
+                    y[i] = av_clip(y_avg + offset_table[difference_selector] *
+                                   sign_table[sign_selector][i], 0, 63);
+                }
+            } else if (get_bits1(&gb)) {
+                if (get_bits1(&gb)) {
+                    y_avg = get_bits(&gb, 6);
+                } else {
+                    unsigned adjust_index = get_bits(&gb, 3);
+                    y_avg = (y_avg + luma_adjust[adjust_index]) & 63;
+                }
+                for (i = 0; i < 4; i++)
+                    y[i] = y_avg;
+            }
+
+            if (get_bits1(&gb)) {
+                if (get_bits1(&gb)) {
+                    cb = get_bits(&gb, 5);
+                    cr = get_bits(&gb, 5);
+                } else {
+                    unsigned adjust_index = get_bits(&gb, 3);
+                    cb = (cb + chroma_adjust[0][adjust_index]) & 31;
+                    cr = (cr + chroma_adjust[1][adjust_index]) & 31;
+                }
+            }
+        }
+        *ya++ = y_avg;
+
+        new_y[0]                = y[0];
+        new_y[1]                = y[1];
+        new_y[new_y_stride]     = y[2];
+        new_y[new_y_stride + 1] = y[3];
+        *new_cb = cb;
+        *new_cr = cr;
+
+        old_y += 2;
+        old_cb++;
+        old_cr++;
+        new_y += 2;
+        new_cb++;
+        new_cr++;
+        block_x++;
+        if (block_x * 2 == avctx->width) {
+            block_x = 0;
+            old_y  += old_y_stride * 2  - avctx->width;
+            old_cb += old_cb_stride     - avctx->width / 2;
+            old_cr += old_cr_stride     - avctx->width / 2;
+            new_y  += new_y_stride * 2  - avctx->width;
+            new_cb += new_cb_stride     - avctx->width / 2;
+            new_cr += new_cr_stride     - avctx->width / 2;
+        }
+
+        skip--;
+    }
+
+    new_y  = s->new_y;
+    new_cb = s->new_u;
+    new_cr = s->new_v;
+    dstY   = pic->data[0];
+    dstU   = pic->data[1];
+    dstV   = pic->data[2];
+    for (j = 0; j < avctx->height; j++) {
+        for (i = 0; i < avctx->width; i++)
+            dstY[i] = new_y[i] << 2;
+        dstY  += pic->linesize[0];
+        new_y += new_y_stride;
+    }
+    for (j = 0; j < avctx->height / 2; j++) {
+        for (i = 0; i < avctx->width / 2; i++) {
+            dstU[i] = chroma_vals[new_cb[i]];
+            dstV[i] = chroma_vals[new_cr[i]];
+        }
+        dstU   += pic->linesize[1];
+        dstV   += pic->linesize[2];
+        new_cb += new_cb_stride;
+        new_cr += new_cr_stride;
+    }
+
+    av_dlog(avctx, "Frame data: provided %d bytes, used %d bytes\n",
+            buf_size, get_bits_count(&gb) >> 3);
+
+    FFSWAP(uint8_t*, s->old_y, s->new_y);
+    FFSWAP(uint8_t*, s->old_u, s->new_u);
+    FFSWAP(uint8_t*, s->old_v, s->new_v);
+
+    *got_frame = 1;
+
+    return buf_size;
+}
+
+AVCodec ff_escape130_decoder = {
+    .name           = "escape130",
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_ESCAPE130,
+    .priv_data_size = sizeof(Escape130Context),
+    .init           = escape130_decode_init,
+    .close          = escape130_decode_close,
+    .decode         = escape130_decode_frame,
+    .capabilities   = CODEC_CAP_DR1,
+    .long_name      = NULL_IF_CONFIG_SMALL("Escape 130"),
+};