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Diffstat (limited to 'ffmpeg/libavcodec/cdxl.c')
-rw-r--r--ffmpeg/libavcodec/cdxl.c303
1 files changed, 303 insertions, 0 deletions
diff --git a/ffmpeg/libavcodec/cdxl.c b/ffmpeg/libavcodec/cdxl.c
new file mode 100644
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+++ b/ffmpeg/libavcodec/cdxl.c
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+/*
+ * CDXL video decoder
+ * Copyright (c) 2011-2012 Paul B Mahol
+ *
+ * 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
+ */
+
+#define UNCHECKED_BITSTREAM_READER 1
+
+#include "libavutil/intreadwrite.h"
+#include "libavutil/imgutils.h"
+#include "avcodec.h"
+#include "get_bits.h"
+#include "internal.h"
+
+#define BIT_PLANAR 0x00
+#define CHUNKY 0x20
+#define BYTE_PLANAR 0x40
+#define BIT_LINE 0x80
+#define BYTE_LINE 0xC0
+
+typedef struct {
+ AVCodecContext *avctx;
+ int bpp;
+ int format;
+ int padded_bits;
+ 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;
+
+ 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], (0xFFU << 24) | (r << 16) | (g << 8) | b);
+ }
+}
+
+static void bitplanar2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
+{
+ GetBitContext gb;
+ int x, y, plane;
+
+ init_get_bits(&gb, c->video, c->video_size * 8);
+ for (plane = 0; plane < c->bpp; plane++) {
+ for (y = 0; y < c->avctx->height; y++) {
+ for (x = 0; x < c->avctx->width; x++)
+ out[linesize * y + x] |= get_bits1(&gb) << plane;
+ skip_bits(&gb, c->padded_bits);
+ }
+ }
+}
+
+static void bitline2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
+{
+ GetBitContext gb;
+ int x, y, plane;
+
+ init_get_bits(&gb, c->video, c->video_size * 8);
+ for (y = 0; y < c->avctx->height; y++) {
+ for (plane = 0; plane < c->bpp; plane++) {
+ for (x = 0; x < c->avctx->width; x++)
+ out[linesize * y + x] |= get_bits1(&gb) << plane;
+ skip_bits(&gb, c->padded_bits);
+ }
+ }
+}
+
+static void import_format(CDXLVideoContext *c, int linesize, uint8_t *out)
+{
+ memset(out, 0, linesize * c->avctx->height);
+
+ switch (c->format) {
+ case BIT_PLANAR:
+ bitplanar2chunky(c, linesize, out);
+ break;
+ case BIT_LINE:
+ bitline2chunky(c, linesize, out);
+ break;
+ }
+}
+
+static void cdxl_decode_rgb(CDXLVideoContext *c, AVFrame *frame)
+{
+ uint32_t *new_palette = (uint32_t *)frame->data[1];
+
+ memset(frame->data[1], 0, AVPALETTE_SIZE);
+ import_palette(c, new_palette);
+ import_format(c, frame->linesize[0], frame->data[0]);
+}
+
+static void cdxl_decode_ham6(CDXLVideoContext *c, AVFrame *frame)
+{
+ 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 = frame->data[0];
+
+ import_palette(c, new_palette);
+ import_format(c, 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_WL24(out + x * 3, r | g | b);
+ }
+ out += frame->linesize[0];
+ }
+}
+
+static void cdxl_decode_ham8(CDXLVideoContext *c, AVFrame *frame)
+{
+ 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 = frame->data[0];
+
+ import_palette(c, new_palette);
+ import_format(c, 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_WL24(out + x * 3, r | g | b);
+ }
+ out += frame->linesize[0];
+ }
+}
+
+static int cdxl_decode_frame(AVCodecContext *avctx, void *data,
+ int *got_frame, AVPacket *pkt)
+{
+ CDXLVideoContext *c = avctx->priv_data;
+ AVFrame * const p = data;
+ int ret, w, h, encoding, aligned_width, buf_size = pkt->size;
+ const uint8_t *buf = pkt->data;
+
+ if (buf_size < 32)
+ return AVERROR_INVALIDDATA;
+ encoding = buf[1] & 7;
+ c->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->format != BIT_PLANAR && c->format != BIT_LINE) {
+ avpriv_request_sample(avctx, "Pixel format 0x%0x", c->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);
+
+ aligned_width = FFALIGN(c->avctx->width, 16);
+ c->padded_bits = aligned_width - c->avctx->width;
+ if (c->video_size < aligned_width * avctx->height * c->bpp / 8)
+ return AVERROR_INVALIDDATA;
+ if (!encoding && c->palette_size && c->bpp <= 8) {
+ avctx->pix_fmt = AV_PIX_FMT_PAL8;
+ } else if (encoding == 1 && (c->bpp == 6 || c->bpp == 8)) {
+ if (c->palette_size != (1 << (c->bpp - 1)))
+ return AVERROR_INVALIDDATA;
+ avctx->pix_fmt = AV_PIX_FMT_BGR24;
+ } else {
+ avpriv_request_sample(avctx, "Encoding %d and bpp %d",
+ encoding, c->bpp);
+ return AVERROR_PATCHWELCOME;
+ }
+
+ if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
+ 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, p);
+ else
+ cdxl_decode_ham6(c, p);
+ } else {
+ cdxl_decode_rgb(c, p);
+ }
+ *got_frame = 1;
+
+ return buf_size;
+}
+
+static av_cold int cdxl_decode_end(AVCodecContext *avctx)
+{
+ CDXLVideoContext *c = avctx->priv_data;
+
+ av_free(c->new_video);
+
+ return 0;
+}
+
+AVCodec ff_cdxl_decoder = {
+ .name = "cdxl",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_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"),
+};
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