/*
* American Laser Games MM Video Decoder
- * Copyright (c) 2006 Peter Ross
+ * Copyright (c) 2006,2008 Peter Ross
*
- * This library is free software; you can redistribute it and/or
+ * 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 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This library is distributed in the hope that it will be useful,
+ * 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 this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* http://wiki.multimedia.cx/index.php?title=American_Laser_Games_MM
*/
+#include "libavutil/intreadwrite.h"
#include "avcodec.h"
#define MM_PREAMBLE_SIZE 6
#define MM_TYPE_INTER_HH 0xd
#define MM_TYPE_INTRA_HHV 0xe
#define MM_TYPE_INTER_HHV 0xf
+#define MM_TYPE_PALETTE 0x31
typedef struct MmContext {
AVCodecContext *avctx;
AVFrame frame;
+ int palette[AVPALETTE_COUNT];
} MmContext;
-static int mm_decode_init(AVCodecContext *avctx)
+static av_cold int mm_decode_init(AVCodecContext *avctx)
{
MmContext *s = avctx->priv_data;
s->avctx = avctx;
- if (s->avctx->palctrl == NULL) {
- av_log(avctx, AV_LOG_ERROR, "mmvideo: palette expected.\n");
- return -1;
- }
-
avctx->pix_fmt = PIX_FMT_PAL8;
- avctx->has_b_frames = 0;
if (avcodec_check_dimensions(avctx, avctx->width, avctx->height))
return -1;
return 0;
}
+static void mm_decode_pal(MmContext *s, const uint8_t *buf, const uint8_t *buf_end)
+{
+ int i;
+ buf += 4;
+ for (i=0; i<128 && buf+2<buf_end; i++) {
+ s->palette[i] = AV_RB24(buf);
+ s->palette[i+128] = s->palette[i]<<2;
+ buf += 3;
+ }
+}
+
static void mm_decode_intra(MmContext * s, int half_horiz, int half_vert, const uint8_t *buf, int buf_size)
{
int i, x, y;
static void mm_decode_inter(MmContext * s, int half_horiz, int half_vert, const uint8_t *buf, int buf_size)
{
- const int data_ptr = 2 + LE_16(&buf[0]);
+ const int data_ptr = 2 + AV_RL16(&buf[0]);
int d, r, y;
d = data_ptr; r = 2; y = 0;
static int mm_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
- uint8_t *buf, int buf_size)
+ const uint8_t *buf, int buf_size)
{
MmContext *s = avctx->priv_data;
- AVPaletteControl *palette_control = avctx->palctrl;
+ const uint8_t *buf_end = buf+buf_size;
int type;
- if (palette_control->palette_changed) {
- memcpy(s->frame.data[1], palette_control->palette, AVPALETTE_SIZE);
- palette_control->palette_changed = 0;
- }
-
- type = LE_16(&buf[0]);
+ type = AV_RL16(&buf[0]);
buf += MM_PREAMBLE_SIZE;
buf_size -= MM_PREAMBLE_SIZE;
switch(type) {
+ case MM_TYPE_PALETTE : mm_decode_pal(s, buf, buf_end); return buf_size;
case MM_TYPE_INTRA : mm_decode_intra(s, 0, 0, buf, buf_size); break;
case MM_TYPE_INTRA_HH : mm_decode_intra(s, 1, 0, buf, buf_size); break;
case MM_TYPE_INTRA_HHV : mm_decode_intra(s, 1, 1, buf, buf_size); break;
return -1;
}
+ memcpy(s->frame.data[1], s->palette, AVPALETTE_SIZE);
+
*data_size = sizeof(AVFrame);
*(AVFrame*)data = s->frame;
return buf_size;
}
-static int mm_decode_end(AVCodecContext *avctx)
+static av_cold int mm_decode_end(AVCodecContext *avctx)
{
MmContext *s = avctx->priv_data;
mm_decode_end,
mm_decode_frame,
CODEC_CAP_DR1,
+ .long_name = NULL_IF_CONFIG_SMALL("American Laser Games MM Video"),
};