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
23 * @file libavcodec/msrle.c
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,
68 const uint8_t *buf = avpkt->data;
69 int buf_size = avpkt->size;
70 MsrleContext *s = avctx->priv_data;
75 s->frame.reference = 1;
76 s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
77 if (avctx->reget_buffer(avctx, &s->frame)) {
78 av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
82 if (s->avctx->palctrl) {
83 /* make the palette available */
84 memcpy(s->frame.data[1], s->avctx->palctrl->palette, AVPALETTE_SIZE);
85 if (s->avctx->palctrl->palette_changed) {
86 s->frame.palette_has_changed = 1;
87 s->avctx->palctrl->palette_changed = 0;
91 ff_msrle_decode(avctx, (AVPicture*)&s->frame, avctx->bits_per_coded_sample, buf, buf_size);
93 *data_size = sizeof(AVFrame);
94 *(AVFrame*)data = s->frame;
96 /* report that the buffer was completely consumed */
100 static av_cold int msrle_decode_end(AVCodecContext *avctx)
102 MsrleContext *s = avctx->priv_data;
104 /* release the last frame */
105 if (s->frame.data[0])
106 avctx->release_buffer(avctx, &s->frame);
111 AVCodec msrle_decoder = {
115 sizeof(MsrleContext),
121 .long_name= NULL_IF_CONFIG_SMALL("Microsoft RLE"),