FFmpeg
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 FFmpeg.
6  *
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.
11  *
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.
16  *
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
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 {
39 
42 } AascContext;
43 
45 {
46  AascContext *s = avctx->priv_data;
47  uint8_t *ptr;
48  int i;
49 
50  s->avctx = avctx;
51  switch (avctx->bits_per_coded_sample) {
52  case 8:
53  avctx->pix_fmt = AV_PIX_FMT_PAL8;
54 
55  ptr = avctx->extradata;
56  s->palette_size = FFMIN(avctx->extradata_size, AVPALETTE_SIZE);
57  for (i = 0; i < s->palette_size / 4; i++) {
58  s->palette[i] = 0xFFU << 24 | AV_RL32(ptr);
59  ptr += 4;
60  }
61  break;
62  case 16:
64  break;
65  case 24:
66  avctx->pix_fmt = AV_PIX_FMT_BGR24;
67  break;
68  default:
69  av_log(avctx, AV_LOG_ERROR, "Unsupported bit depth: %d\n", avctx->bits_per_coded_sample);
70  return -1;
71  }
72 
73  s->frame = av_frame_alloc();
74  if (!s->frame)
75  return AVERROR(ENOMEM);
76 
77  return 0;
78 }
79 
81  void *data, int *got_frame,
82  AVPacket *avpkt)
83 {
84  const uint8_t *buf = avpkt->data;
85  int buf_size = avpkt->size;
86  AascContext *s = avctx->priv_data;
87  int compr, i, stride, psize, ret;
88 
89  if (buf_size < 4) {
90  av_log(avctx, AV_LOG_ERROR, "frame too short\n");
91  return AVERROR_INVALIDDATA;
92  }
93 
94  if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
95  return ret;
96 
97  compr = AV_RL32(buf);
98  buf += 4;
99  buf_size -= 4;
100  psize = avctx->bits_per_coded_sample / 8;
101  switch (avctx->codec_tag) {
102  case MKTAG('A', 'A', 'S', '4'):
103  bytestream2_init(&s->gb, buf - 4, buf_size + 4);
104  ff_msrle_decode(avctx, s->frame, 8, &s->gb);
105  break;
106  case MKTAG('A', 'A', 'S', 'C'):
107  switch (compr) {
108  case 0:
109  stride = (avctx->width * psize + psize) & ~psize;
110  if (buf_size < stride * avctx->height)
111  return AVERROR_INVALIDDATA;
112  for (i = avctx->height - 1; i >= 0; i--) {
113  memcpy(s->frame->data[0] + i * s->frame->linesize[0], buf, avctx->width * psize);
114  buf += stride;
115  buf_size -= stride;
116  }
117  break;
118  case 1:
119  bytestream2_init(&s->gb, buf, buf_size);
120  ff_msrle_decode(avctx, s->frame, 8, &s->gb);
121  break;
122  default:
123  av_log(avctx, AV_LOG_ERROR, "Unknown compression type %d\n", compr);
124  return AVERROR_INVALIDDATA;
125  }
126  break;
127  default:
128  av_log(avctx, AV_LOG_ERROR, "Unknown FourCC: %X\n", avctx->codec_tag);
129  return -1;
130  }
131 
132  if (avctx->pix_fmt == AV_PIX_FMT_PAL8)
133  memcpy(s->frame->data[1], s->palette, s->palette_size);
134 
135  *got_frame = 1;
136  if ((ret = av_frame_ref(data, s->frame)) < 0)
137  return ret;
138 
139  /* report that the buffer was completely consumed */
140  return avpkt->size;
141 }
142 
144 {
145  AascContext *s = avctx->priv_data;
146 
147  av_frame_free(&s->frame);
148 
149  return 0;
150 }
151 
153  .name = "aasc",
154  .long_name = NULL_IF_CONFIG_SMALL("Autodesk RLE"),
155  .type = AVMEDIA_TYPE_VIDEO,
156  .id = AV_CODEC_ID_AASC,
157  .priv_data_size = sizeof(AascContext),
159  .close = aasc_decode_end,
161  .capabilities = AV_CODEC_CAP_DR1,
162  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
163 };
aasc_decode_frame
static int aasc_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: aasc.c:80
AVCodec
AVCodec.
Definition: codec.h:197
stride
int stride
Definition: mace.c:144
FF_CODEC_CAP_INIT_THREADSAFE
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
Definition: internal.h:41
init
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:31
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
GetByteContext
Definition: bytestream.h:33
MKTAG
#define MKTAG(a, b, c, d)
Definition: common.h:478
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:111
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:303
internal.h
AVPacket::data
uint8_t * data
Definition: packet.h:365
data
const char data[16]
Definition: mxf.c:142
AV_PIX_FMT_BGR24
@ AV_PIX_FMT_BGR24
packed RGB 8:8:8, 24bpp, BGRBGR...
Definition: pixfmt.h:69
AascContext::palette_size
int palette_size
Definition: aasc.c:41
U
#define U(x)
Definition: vp56_arith.h:37
AascContext::gb
GetByteContext gb
Definition: aasc.c:37
av_frame_alloc
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:98
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:181
av_cold
#define av_cold
Definition: attributes.h:90
decode
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
AVCodecContext::extradata_size
int extradata_size
Definition: avcodec.h:603
s
#define s(width, name)
Definition: cbs_vp9.c:257
msrledec.h
AVPALETTE_SIZE
#define AVPALETTE_SIZE
Definition: pixfmt.h:32
aasc_decode_init
static av_cold int aasc_decode_init(AVCodecContext *avctx)
Definition: aasc.c:44
ff_aasc_decoder
const AVCodec ff_aasc_decoder
Definition: aasc.c:152
AVPALETTE_COUNT
#define AVPALETTE_COUNT
Definition: pixfmt.h:33
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
AVPacket::size
int size
Definition: packet.h:366
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
av_frame_ref
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:326
height
#define height
FFMIN
#define FFMIN(a, b)
Definition: common.h:105
AascContext::palette
uint32_t palette[AVPALETTE_COUNT]
Definition: aasc.c:40
AVCodecContext::bits_per_coded_sample
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:1524
AV_PIX_FMT_RGB555LE
@ AV_PIX_FMT_RGB555LE
packed RGB 5:5:5, 16bpp, (msb)1X 5R 5G 5B(lsb), little-endian, X=unused/undefined
Definition: pixfmt.h:108
i
int i
Definition: input.c:407
AVCodecContext::extradata
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:602
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:204
AVCodecContext::height
int height
Definition: avcodec.h:674
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:711
avcodec.h
AV_PIX_FMT_PAL8
@ AV_PIX_FMT_PAL8
8 bits with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:77
ff_reget_buffer
int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Identical in function to ff_get_buffer(), except it reuses the existing buffer if available.
Definition: decode.c:1745
ret
ret
Definition: filter_design.txt:187
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:92
AVCodecContext
main external API structure.
Definition: avcodec.h:501
AascContext::frame
AVFrame * frame
Definition: aasc.c:38
AascContext
Definition: aasc.c:35
aasc_decode_end
static av_cold int aasc_decode_end(AVCodecContext *avctx)
Definition: aasc.c:143
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
AVCodecContext::codec_tag
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:526
ff_msrle_decode
int ff_msrle_decode(AVCodecContext *avctx, AVFrame *pic, int depth, GetByteContext *gb)
Decode stream in MS RLE format into frame.
Definition: msrledec.c:249
AVPacket
This structure stores compressed data.
Definition: packet.h:342
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:528
AascContext::avctx
AVCodecContext * avctx
Definition: aasc.c:36
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:674
bytestream2_init
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:137
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
AV_CODEC_ID_AASC
@ AV_CODEC_ID_AASC
Definition: codec_id.h:123