remove apparently unused real_pict_num from AVCodecContext
[libav.git] / libavcodec / msrle.c
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1/*
2 * Micrsoft RLE Video Decoder
3 * Copyright (C) 2003 the ffmpeg project
4 *
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5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
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8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
b78e7197 10 * version 2.1 of the License, or (at your option) any later version.
2fdf638b 11 *
b78e7197 12 * FFmpeg is distributed in the hope that it will be useful,
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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.
16 *
17 * You should have received a copy of the GNU Lesser General Public
b78e7197 18 * License along with FFmpeg; if not, write to the Free Software
5509bffa 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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20 */
21
22/**
bad5537e 23 * @file libavcodec/msrle.c
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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/
27 *
28 * The MS RLE decoder outputs PAL8 colorspace data.
29 *
30 * Note that this decoder expects the palette colors from the end of the
875efafa 31 * BITMAPINFO header passed through palctrl.
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32 */
33
34#include <stdio.h>
35#include <stdlib.h>
36#include <string.h>
37#include <unistd.h>
38
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39#include "avcodec.h"
40#include "dsputil.h"
44aa9771 41#include "msrledec.h"
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42
43typedef struct MsrleContext {
44 AVCodecContext *avctx;
45 AVFrame frame;
2fdf638b 46
7993df65 47 const unsigned char *buf;
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48 int size;
49
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50} MsrleContext;
51
98a6fff9 52static av_cold int msrle_decode_init(AVCodecContext *avctx)
2fdf638b 53{
e4141433 54 MsrleContext *s = avctx->priv_data;
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55
56 s->avctx = avctx;
57
58 avctx->pix_fmt = PIX_FMT_PAL8;
e1c2a5a0 59 s->frame.data[0] = NULL;
2fdf638b 60
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61 return 0;
62}
63
64static int msrle_decode_frame(AVCodecContext *avctx,
65 void *data, int *data_size,
7a00bbad 66 AVPacket *avpkt)
2fdf638b 67{
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68 const uint8_t *buf = avpkt->data;
69 int buf_size = avpkt->size;
e4141433 70 MsrleContext *s = avctx->priv_data;
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71
72 s->buf = buf;
73 s->size = buf_size;
74
04939fb7 75 s->frame.reference = 1;
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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");
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79 return -1;
80 }
81
a7e56229 82 if (s->avctx->palctrl) {
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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;
88 }
a7e56229 89 }
2fdf638b 90
5d44b2a1 91 ff_msrle_decode(avctx, (AVPicture*)&s->frame, avctx->bits_per_coded_sample, buf, buf_size);
44aa9771 92
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93 *data_size = sizeof(AVFrame);
94 *(AVFrame*)data = s->frame;
95
96 /* report that the buffer was completely consumed */
97 return buf_size;
98}
99
98a6fff9 100static av_cold int msrle_decode_end(AVCodecContext *avctx)
2fdf638b 101{
e4141433 102 MsrleContext *s = avctx->priv_data;
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103
104 /* release the last frame */
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105 if (s->frame.data[0])
106 avctx->release_buffer(avctx, &s->frame);
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107
108 return 0;
109}
110
111AVCodec msrle_decoder = {
112 "msrle",
113 CODEC_TYPE_VIDEO,
114 CODEC_ID_MSRLE,
115 sizeof(MsrleContext),
116 msrle_decode_init,
117 NULL,
118 msrle_decode_end,
119 msrle_decode_frame,
e1c2a5a0 120 CODEC_CAP_DR1,
fe4bf374 121 .long_name= NULL_IF_CONFIG_SMALL("Microsoft RLE"),
2fdf638b 122};