Libav
aasc.c
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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 
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 {
39 } AascContext;
40 
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 
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 (buf_size < 4)
66  return AVERROR_INVALIDDATA;
67 
68  if ((ret = ff_reget_buffer(avctx, s->frame)) < 0) {
69  av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
70  return ret;
71  }
72 
73  compr = AV_RL32(buf);
74  buf += 4;
75  buf_size -= 4;
76  switch (compr) {
77  case 0:
78  stride = (avctx->width * 3 + 3) & ~3;
79  if (buf_size < stride * avctx->height)
80  return AVERROR_INVALIDDATA;
81  for (i = avctx->height - 1; i >= 0; i--) {
82  memcpy(s->frame->data[0] + i * s->frame->linesize[0], buf, avctx->width * 3);
83  buf += stride;
84  }
85  break;
86  case 1:
87  bytestream2_init(&s->gb, buf, buf_size);
88  ff_msrle_decode(avctx, (AVPicture*)s->frame, 8, &s->gb);
89  break;
90  default:
91  av_log(avctx, AV_LOG_ERROR, "Unknown compression type %d\n", compr);
92  return AVERROR_INVALIDDATA;
93  }
94 
95  *got_frame = 1;
96  if ((ret = av_frame_ref(data, s->frame)) < 0)
97  return ret;
98 
99  /* report that the buffer was completely consumed */
100  return avpkt->size;
101 }
102 
104 {
105  AascContext *s = avctx->priv_data;
106 
107  av_frame_free(&s->frame);
108 
109  return 0;
110 }
111 
113  .name = "aasc",
114  .long_name = NULL_IF_CONFIG_SMALL("Autodesk RLE"),
115  .type = AVMEDIA_TYPE_VIDEO,
116  .id = AV_CODEC_ID_AASC,
117  .priv_data_size = sizeof(AascContext),
121  .capabilities = CODEC_CAP_DR1,
122 };
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:54
This structure describes decoded (raw) audio or video data.
Definition: frame.h:135
int size
Definition: avcodec.h:974
AVFrame * frame
Definition: aasc.c:38
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1270
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:132
four components are given, that's all.
Definition: avcodec.h:3042
int stride
Definition: mace.c:144
AVCodec.
Definition: avcodec.h:2812
static int decode(MimicContext *ctx, int quality, int num_coeffs, int is_iframe)
Definition: mimic.c:275
uint8_t
#define av_cold
Definition: attributes.h:66
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:57
int av_frame_ref(AVFrame *dst, const AVFrame *src)
Set up a new reference to the data described by the source frame.
Definition: frame.c:188
#define CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:684
const char data[16]
Definition: mxf.c:70
uint8_t * data
Definition: avcodec.h:973
static av_cold int aasc_decode_end(AVCodecContext *avctx)
Definition: aasc.c:103
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:123
#define AVERROR(e)
Definition: error.h:43
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:69
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:145
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:169
const char * name
Name of the codec implementation.
Definition: avcodec.h:2819
int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame)
Identical in function to av_frame_make_writable(), except it uses ff_get_buffer() to allocate the buf...
Definition: utils.c:820
GetByteContext gb
Definition: aasc.c:37
int width
picture width / height.
Definition: avcodec.h:1229
static av_cold int aasc_decode_init(AVCodecContext *avctx)
Definition: aasc.c:41
#define AV_RL32
Definition: intreadwrite.h:146
packed RGB 8:8:8, 24bpp, BGRBGR...
Definition: pixfmt.h:68
static int aasc_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: aasc.c:56
Libavcodec external API header.
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:153
main external API structure.
Definition: avcodec.h:1050
static void close(AVCodecParserContext *s)
Definition: h264_parser.c:490
AVCodec ff_aasc_decoder
Definition: aasc.c:112
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:141
int height
Definition: gxfenc.c:72
common internal api header.
static av_cold int init(AVCodecParserContext *s)
Definition: h264_parser.c:499
void * priv_data
Definition: avcodec.h:1092
int ff_msrle_decode(AVCodecContext *avctx, AVPicture *pic, int depth, GetByteContext *gb)
Decode stream in MS RLE format into frame.
Definition: msrledec.c:246
AVCodecContext * avctx
Definition: aasc.c:36
This structure stores compressed data.
Definition: avcodec.h:950