2 * Micrsoft RLE Video Decoder
3 * Copyright (C) 2003 the ffmpeg project
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 * MS RLE Video Decoder by Mike Melanson (melanson@pcisys.net)
25 * For more information about the MS RLE format, visit:
26 * http://www.pcisys.net/~melanson/codecs/
28 * The MS RLE decoder outputs PAL8 colorspace data.
30 * Note that this decoder expects the palette colors from the end of the
31 * BITMAPINFO header passed through palctrl.
43 typedef struct MsrleContext {
44 AVCodecContext *avctx;
47 const unsigned char *buf;
52 static av_cold int msrle_decode_init(AVCodecContext *avctx)
54 MsrleContext *s = avctx->priv_data;
58 avctx->pix_fmt = PIX_FMT_PAL8;
59 s->frame.data[0] = NULL;
64 static int msrle_decode_frame(AVCodecContext *avctx,
65 void *data, int *data_size,
66 const uint8_t *buf, int buf_size)
68 MsrleContext *s = avctx->priv_data;
73 s->frame.reference = 1;
74 s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
75 if (avctx->reget_buffer(avctx, &s->frame)) {
76 av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
80 /* make the palette available */
81 memcpy(s->frame.data[1], s->avctx->palctrl->palette, AVPALETTE_SIZE);
82 if (s->avctx->palctrl->palette_changed) {
83 s->frame.palette_has_changed = 1;
84 s->avctx->palctrl->palette_changed = 0;
87 ff_msrle_decode(avctx, &s->frame, avctx->bits_per_coded_sample, buf, buf_size);
89 *data_size = sizeof(AVFrame);
90 *(AVFrame*)data = s->frame;
92 /* report that the buffer was completely consumed */
96 static av_cold int msrle_decode_end(AVCodecContext *avctx)
98 MsrleContext *s = avctx->priv_data;
100 /* release the last frame */
101 if (s->frame.data[0])
102 avctx->release_buffer(avctx, &s->frame);
107 AVCodec msrle_decoder = {
111 sizeof(MsrleContext),
117 .long_name= NULL_IF_CONFIG_SMALL("Microsoft RLE"),