CDXL demuxer and decoder

Signed-off-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Diego Biurrun <diego@biurrun.de>

1 files changed, 278 insertions, 0 deletions

diff --git a/libavcodec/cdxl.c b/libavcodec/cdxl.c
new file mode 100644
index 0000000..a53a001
--- /dev/null
+++ b/libavcodec/cdxl.c
@@ -0,0 +1,278 @@
+/*
+ * CDXL video decoder
+ * Copyright (c) 2011-2012 Paul B Mahol
+ *
+ * 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/intreadwrite.h"
+#include "libavutil/imgutils.h"
+#include "avcodec.h"
+#include "get_bits.h"
+
+typedef struct {
+    AVCodecContext *avctx;
+    AVFrame        frame;
+    int            bpp;
+    const uint8_t  *palette;
+    int            palette_size;
+    const uint8_t  *video;
+    int            video_size;
+    uint8_t        *new_video;
+    int            new_video_size;
+} CDXLVideoContext;
+
+static av_cold int cdxl_decode_init(AVCodecContext *avctx)
+{
+    CDXLVideoContext *c = avctx->priv_data;
+
+    avcodec_get_frame_defaults(&c->frame);
+    c->new_video_size = 0;
+    c->avctx          = avctx;
+
+    return 0;
+}
+
+static void import_palette(CDXLVideoContext *c, uint32_t *new_palette)
+{
+    int i;
+
+    for (i = 0; i < c->palette_size / 2; i++) {
+        unsigned rgb = AV_RB16(&c->palette[i * 2]);
+        unsigned r   = ((rgb >> 8) & 0xF) * 0x11;
+        unsigned g   = ((rgb >> 4) & 0xF) * 0x11;
+        unsigned b   =  (rgb       & 0xF) * 0x11;
+        AV_WN32(&new_palette[i], (r << 16) | (g << 8) | b);
+    }
+}
+
+static void bitplanar2chunky(CDXLVideoContext *c, int width,
+                             int linesize, uint8_t *out)
+{
+    GetBitContext gb;
+    int x, y, plane;
+
+    init_get_bits(&gb, c->video, c->video_size * 8);
+    memset(out, 0, linesize * c->avctx->height);
+    for (plane = 0; plane < c->bpp; plane++)
+        for (y = 0; y < c->avctx->height; y++)
+            for (x = 0; x < width; x++)
+                out[linesize * y + x] |= get_bits1(&gb) << plane;
+}
+
+static void cdxl_decode_rgb(CDXLVideoContext *c)
+{
+    uint32_t *new_palette = (uint32_t *)c->frame.data[1];
+    int padded_width = FFALIGN(c->avctx->width, 16);
+
+    import_palette(c, new_palette);
+    bitplanar2chunky(c, padded_width, c->frame.linesize[0], c->frame.data[0]);
+}
+
+static void cdxl_decode_ham6(CDXLVideoContext *c)
+{
+    AVCodecContext *avctx = c->avctx;
+    uint32_t new_palette[16], r, g, b;
+    uint8_t *ptr, *out, index, op;
+    int x, y;
+
+    ptr = c->new_video;
+    out = c->frame.data[0];
+
+    import_palette(c, new_palette);
+    bitplanar2chunky(c, avctx->width, avctx->width, c->new_video);
+
+    for (y = 0; y < avctx->height; y++) {
+        r = new_palette[0] & 0xFF0000;
+        g = new_palette[0] & 0xFF00;
+        b = new_palette[0] & 0xFF;
+        for (x = 0; x < avctx->width; x++) {
+            index  = *ptr++;
+            op     = index >> 4;
+            index &= 15;
+            switch (op) {
+            case 0:
+                r = new_palette[index] & 0xFF0000;
+                g = new_palette[index] & 0xFF00;
+                b = new_palette[index] & 0xFF;
+                break;
+            case 1:
+                b = index * 0x11;
+                break;
+            case 2:
+                r = index * 0x11 << 16;
+                break;
+            case 3:
+                g = index * 0x11 << 8;
+                break;
+            }
+            AV_WN32(out + x * 3, r | g | b);
+        }
+        out += c->frame.linesize[0];
+    }
+}
+
+static void cdxl_decode_ham8(CDXLVideoContext *c)
+{
+    AVCodecContext *avctx = c->avctx;
+    uint32_t new_palette[64], r, g, b;
+    uint8_t *ptr, *out, index, op;
+    int x, y;
+
+    ptr = c->new_video;
+    out = c->frame.data[0];
+
+    import_palette(c, new_palette);
+    bitplanar2chunky(c, avctx->width, avctx->width, c->new_video);
+
+    for (y = 0; y < avctx->height; y++) {
+        r = new_palette[0] & 0xFF0000;
+        g = new_palette[0] & 0xFF00;
+        b = new_palette[0] & 0xFF;
+        for (x = 0; x < avctx->width; x++) {
+            index  = *ptr++;
+            op     = index >> 6;
+            index &= 63;
+            switch (op) {
+            case 0:
+                r = new_palette[index] & 0xFF0000;
+                g = new_palette[index] & 0xFF00;
+                b = new_palette[index] & 0xFF;
+                break;
+            case 1:
+                b = (index <<  2) | (b & 3);
+                break;
+            case 2:
+                r = (index << 18) | (r & (3 << 16));
+                break;
+            case 3:
+                g = (index << 10) | (g & (3 << 8));
+                break;
+            }
+            AV_WN32(out + x * 3, r | g | b);
+        }
+        out += c->frame.linesize[0];
+    }
+}
+
+static int cdxl_decode_frame(AVCodecContext *avctx, void *data,
+                             int *data_size, AVPacket *pkt)
+{
+    CDXLVideoContext *c = avctx->priv_data;
+    AVFrame * const p = &c->frame;
+    int ret, w, h, encoding, format, buf_size = pkt->size;
+    const uint8_t *buf = pkt->data;
+
+    if (buf_size < 32)
+        return AVERROR_INVALIDDATA;
+    encoding        = buf[1] & 7;
+    format          = buf[1] & 0xE0;
+    w               = AV_RB16(&buf[14]);
+    h               = AV_RB16(&buf[16]);
+    c->bpp          = buf[19];
+    c->palette_size = AV_RB16(&buf[20]);
+    c->palette      = buf + 32;
+    c->video        = c->palette + c->palette_size;
+    c->video_size   = buf_size - c->palette_size - 32;
+
+    if (c->palette_size > 512)
+        return AVERROR_INVALIDDATA;
+    if (buf_size < c->palette_size + 32)
+        return AVERROR_INVALIDDATA;
+    if (c->bpp < 1)
+        return AVERROR_INVALIDDATA;
+    if (c->bpp > 8) {
+        av_log_ask_for_sample(avctx, "unsupported pixel size: %d\n", c->bpp);
+        return AVERROR_PATCHWELCOME;
+    }
+    if (format) {
+        av_log_ask_for_sample(avctx, "unsupported pixel format: %d\n", format);
+        return AVERROR_PATCHWELCOME;
+    }
+
+    if ((ret = av_image_check_size(w, h, 0, avctx)) < 0)
+        return ret;
+    if (w != avctx->width || h != avctx->height)
+        avcodec_set_dimensions(avctx, w, h);
+
+    if (encoding == 0) {
+        if (c->video_size < FFALIGN(avctx->width, 16) *
+                            avctx->height * c->bpp / 8)
+            return AVERROR_INVALIDDATA;
+        avctx->pix_fmt = PIX_FMT_PAL8;
+    } else if (encoding == 1 && (c->bpp == 6 || c->bpp == 8)) {
+        if (c->palette_size != (1 << (c->bpp - 1)))
+            return AVERROR_INVALIDDATA;
+        if (c->video_size < avctx->width * avctx->height * c->bpp / 8)
+            return AVERROR_INVALIDDATA;
+        avctx->pix_fmt = PIX_FMT_BGR24;
+    } else {
+        av_log_ask_for_sample(avctx, "unsupported encoding %d and bpp %d\n",
+                              encoding, c->bpp);
+        return AVERROR_PATCHWELCOME;
+    }
+
+    if (p->data[0])
+        avctx->release_buffer(avctx, p);
+
+    p->reference = 0;
+    if ((ret = avctx->get_buffer(avctx, p)) < 0) {
+        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+        return ret;
+    }
+    p->pict_type = AV_PICTURE_TYPE_I;
+
+    if (encoding) {
+        av_fast_padded_malloc(&c->new_video, &c->new_video_size,
+                              h * w + FF_INPUT_BUFFER_PADDING_SIZE);
+        if (!c->new_video)
+            return AVERROR(ENOMEM);
+        if (c->bpp == 8)
+            cdxl_decode_ham8(c);
+        else
+            cdxl_decode_ham6(c);
+    } else {
+        cdxl_decode_rgb(c);
+    }
+    *data_size      = sizeof(AVFrame);
+    *(AVFrame*)data = c->frame;
+
+    return buf_size;
+}
+
+static av_cold int cdxl_decode_end(AVCodecContext *avctx)
+{
+    CDXLVideoContext *c = avctx->priv_data;
+
+    av_free(c->new_video);
+    if (c->frame.data[0])
+        avctx->release_buffer(avctx, &c->frame);
+
+    return 0;
+}
+
+AVCodec ff_cdxl_decoder = {
+    .name           = "cdxl",
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = CODEC_ID_CDXL,
+    .priv_data_size = sizeof(CDXLVideoContext),
+    .init           = cdxl_decode_init,
+    .close          = cdxl_decode_end,
+    .decode         = cdxl_decode_frame,
+    .capabilities   = CODEC_CAP_DR1,
+    .long_name      = NULL_IF_CONFIG_SMALL("Commodore CDXL video"),
+};