lavc decoders: work with refcounted frames.
[libav.git] / libavcodec / aasc.c
1 /*
2 * Autodesk RLE Decoder
3 * Copyright (C) 2005 the ffmpeg project
4 *
5 * This file is part of Libav.
6 *
7 * Libav 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.
11 *
12 * Libav 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.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file
24 * Autodesk RLE Video Decoder by Konstantin Shishkov
25 */
26
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <string.h>
30
31 #include "avcodec.h"
32 #include "internal.h"
33 #include "msrledec.h"
34
35 typedef struct AascContext {
36 AVCodecContext *avctx;
37 GetByteContext gb;
38 AVFrame *frame;
39 } AascContext;
40
41 static av_cold int aasc_decode_init(AVCodecContext *avctx)
42 {
43 AascContext *s = avctx->priv_data;
44
45 s->avctx = avctx;
46
47 avctx->pix_fmt = AV_PIX_FMT_BGR24;
48
49 s->frame = av_frame_alloc();
50 if (!s->frame)
51 return AVERROR(ENOMEM);
52
53 return 0;
54 }
55
56 static int aasc_decode_frame(AVCodecContext *avctx,
57 void *data, int *got_frame,
58 AVPacket *avpkt)
59 {
60 const uint8_t *buf = avpkt->data;
61 int buf_size = avpkt->size;
62 AascContext *s = avctx->priv_data;
63 int compr, i, stride, ret;
64
65 if ((ret = ff_reget_buffer(avctx, s->frame)) < 0) {
66 av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
67 return ret;
68 }
69
70 compr = AV_RL32(buf);
71 buf += 4;
72 buf_size -= 4;
73 switch (compr) {
74 case 0:
75 stride = (avctx->width * 3 + 3) & ~3;
76 for (i = avctx->height - 1; i >= 0; i--) {
77 memcpy(s->frame->data[0] + i * s->frame->linesize[0], buf, avctx->width * 3);
78 buf += stride;
79 }
80 break;
81 case 1:
82 bytestream2_init(&s->gb, buf, buf_size);
83 ff_msrle_decode(avctx, (AVPicture*)s->frame, 8, &s->gb);
84 break;
85 default:
86 av_log(avctx, AV_LOG_ERROR, "Unknown compression type %d\n", compr);
87 return AVERROR_INVALIDDATA;
88 }
89
90 *got_frame = 1;
91 if ((ret = av_frame_ref(data, s->frame)) < 0)
92 return ret;
93
94 /* report that the buffer was completely consumed */
95 return buf_size;
96 }
97
98 static av_cold int aasc_decode_end(AVCodecContext *avctx)
99 {
100 AascContext *s = avctx->priv_data;
101
102 av_frame_free(&s->frame);
103
104 return 0;
105 }
106
107 AVCodec ff_aasc_decoder = {
108 .name = "aasc",
109 .type = AVMEDIA_TYPE_VIDEO,
110 .id = AV_CODEC_ID_AASC,
111 .priv_data_size = sizeof(AascContext),
112 .init = aasc_decode_init,
113 .close = aasc_decode_end,
114 .decode = aasc_decode_frame,
115 .capabilities = CODEC_CAP_DR1,
116 .long_name = NULL_IF_CONFIG_SMALL("Autodesk RLE"),
117 };