introduce side information for AVPacket
[libav.git] / libavcodec / msrle.c
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1/*
2 * Micrsoft RLE Video Decoder
3 * Copyright (C) 2003 the ffmpeg project
4 *
2912e87a 5 * This file is part of Libav.
b78e7197 6 *
2912e87a 7 * Libav 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 *
2912e87a 12 * Libav 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
2912e87a 18 * License along with Libav; 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/**
ba87f080 23 * @file
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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>
2fdf638b 37
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38#include "avcodec.h"
39#include "dsputil.h"
44aa9771 40#include "msrledec.h"
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41
42typedef struct MsrleContext {
43 AVCodecContext *avctx;
44 AVFrame frame;
2fdf638b 45
7993df65 46 const unsigned char *buf;
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47 int size;
48
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49} MsrleContext;
50
98a6fff9 51static av_cold int msrle_decode_init(AVCodecContext *avctx)
2fdf638b 52{
e4141433 53 MsrleContext *s = avctx->priv_data;
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54
55 s->avctx = avctx;
56
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57 switch (avctx->bits_per_coded_sample) {
58 case 4:
59 case 8:
60 avctx->pix_fmt = PIX_FMT_PAL8;
61 break;
62 case 24:
63 avctx->pix_fmt = PIX_FMT_BGR24;
64 break;
65 default:
66 av_log(avctx, AV_LOG_ERROR, "unsupported bits per sample\n");
67 return -1;
68 }
69
e1c2a5a0 70 s->frame.data[0] = NULL;
2fdf638b 71
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72 return 0;
73}
74
75static int msrle_decode_frame(AVCodecContext *avctx,
76 void *data, int *data_size,
7a00bbad 77 AVPacket *avpkt)
2fdf638b 78{
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79 const uint8_t *buf = avpkt->data;
80 int buf_size = avpkt->size;
e4141433 81 MsrleContext *s = avctx->priv_data;
2ed16f30 82 int istride = FFALIGN(avctx->width*avctx->bits_per_coded_sample, 32) / 8;
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83
84 s->buf = buf;
85 s->size = buf_size;
86
04939fb7 87 s->frame.reference = 1;
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88 s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
89 if (avctx->reget_buffer(avctx, &s->frame)) {
90 av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
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91 return -1;
92 }
93
a7e56229 94 if (s->avctx->palctrl) {
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95 /* make the palette available */
96 memcpy(s->frame.data[1], s->avctx->palctrl->palette, AVPALETTE_SIZE);
97 if (s->avctx->palctrl->palette_changed) {
98 s->frame.palette_has_changed = 1;
99 s->avctx->palctrl->palette_changed = 0;
100 }
a7e56229 101 }
2fdf638b 102
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103 /* FIXME how to correctly detect RLE ??? */
104 if (avctx->height * istride == avpkt->size) { /* assume uncompressed */
105 int linesize = avctx->width * avctx->bits_per_coded_sample / 8;
106 uint8_t *ptr = s->frame.data[0];
107 uint8_t *buf = avpkt->data + (avctx->height-1)*istride;
108 int i, j;
109
110 for (i = 0; i < avctx->height; i++) {
111 if (avctx->bits_per_coded_sample == 4) {
112 for (j = 0; j < avctx->width - 1; j += 2) {
113 ptr[j+0] = buf[j>>1] >> 4;
114 ptr[j+1] = buf[j>>1] & 0xF;
115 }
116 if (avctx->width & 1)
117 ptr[j+0] = buf[j>>1] >> 4;
118 } else {
119 memcpy(ptr, buf, linesize);
120 }
121 buf -= istride;
122 ptr += s->frame.linesize[0];
123 }
124 } else {
125 ff_msrle_decode(avctx, (AVPicture*)&s->frame, avctx->bits_per_coded_sample, buf, buf_size);
126 }
44aa9771 127
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128 *data_size = sizeof(AVFrame);
129 *(AVFrame*)data = s->frame;
130
131 /* report that the buffer was completely consumed */
132 return buf_size;
133}
134
98a6fff9 135static av_cold int msrle_decode_end(AVCodecContext *avctx)
2fdf638b 136{
e4141433 137 MsrleContext *s = avctx->priv_data;
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138
139 /* release the last frame */
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140 if (s->frame.data[0])
141 avctx->release_buffer(avctx, &s->frame);
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142
143 return 0;
144}
145
d36beb3f 146AVCodec ff_msrle_decoder = {
2fdf638b 147 "msrle",
72415b2a 148 AVMEDIA_TYPE_VIDEO,
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149 CODEC_ID_MSRLE,
150 sizeof(MsrleContext),
151 msrle_decode_init,
152 NULL,
153 msrle_decode_end,
154 msrle_decode_frame,
e1c2a5a0 155 CODEC_CAP_DR1,
fe4bf374 156 .long_name= NULL_IF_CONFIG_SMALL("Microsoft RLE"),
2fdf638b 157};