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avuidec.c
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1 /*
2  * AVID Meridien decoder
3  *
4  * Copyright (c) 2012 Carl Eugen Hoyos
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #include "avcodec.h"
24 #include "internal.h"
25 #include "libavutil/intreadwrite.h"
26 
28 {
30  return 0;
31 }
32 
33 static int avui_decode_frame(AVCodecContext *avctx, void *data,
34  int *got_frame, AVPacket *avpkt)
35 {
36  int ret;
37  AVFrame *pic = data;
38  const uint8_t *src = avpkt->data, *extradata = avctx->extradata;
39  const uint8_t *srca;
40  uint8_t *y, *u, *v, *a;
41  int transparent, interlaced = 1, skip, opaque_length, i, j, k;
42  uint32_t extradata_size = avctx->extradata_size;
43 
44  while (extradata_size >= 24) {
45  uint32_t atom_size = AV_RB32(extradata);
46  if (!memcmp(&extradata[4], "APRGAPRG0001", 12)) {
47  interlaced = extradata[19] != 1;
48  break;
49  }
50  if (atom_size && atom_size <= extradata_size) {
51  extradata += atom_size;
52  extradata_size -= atom_size;
53  } else {
54  break;
55  }
56  }
57  if (avctx->height == 486) {
58  skip = 10;
59  } else {
60  skip = 16;
61  }
62  opaque_length = 2 * avctx->width * (avctx->height + skip) + 4 * interlaced;
63  if (avpkt->size < opaque_length) {
64  av_log(avctx, AV_LOG_ERROR, "Insufficient input data.\n");
65  return AVERROR(EINVAL);
66  }
67  transparent = avctx->bits_per_coded_sample == 32 &&
68  avpkt->size >= opaque_length * 2 + 4;
69  srca = src + opaque_length + 5;
70 
71  if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
72  return ret;
73 
74  pic->key_frame = 1;
76 
77  if (!interlaced) {
78  src += avctx->width * skip;
79  srca += avctx->width * skip;
80  }
81 
82  for (i = 0; i < interlaced + 1; i++) {
83  src += avctx->width * skip;
84  srca += avctx->width * skip;
85  if (interlaced && avctx->height == 486) {
86  y = pic->data[0] + (1 - i) * pic->linesize[0];
87  u = pic->data[1] + (1 - i) * pic->linesize[1];
88  v = pic->data[2] + (1 - i) * pic->linesize[2];
89  a = pic->data[3] + (1 - i) * pic->linesize[3];
90  } else {
91  y = pic->data[0] + i * pic->linesize[0];
92  u = pic->data[1] + i * pic->linesize[1];
93  v = pic->data[2] + i * pic->linesize[2];
94  a = pic->data[3] + i * pic->linesize[3];
95  }
96 
97  for (j = 0; j < avctx->height >> interlaced; j++) {
98  for (k = 0; k < avctx->width >> 1; k++) {
99  u[ k ] = *src++;
100  y[2 * k ] = *src++;
101  a[2 * k ] = 0xFF - (transparent ? *srca++ : 0);
102  srca++;
103  v[ k ] = *src++;
104  y[2 * k + 1] = *src++;
105  a[2 * k + 1] = 0xFF - (transparent ? *srca++ : 0);
106  srca++;
107  }
108 
109  y += (interlaced + 1) * pic->linesize[0];
110  u += (interlaced + 1) * pic->linesize[1];
111  v += (interlaced + 1) * pic->linesize[2];
112  a += (interlaced + 1) * pic->linesize[3];
113  }
114  src += 4;
115  srca += 4;
116  }
117  *got_frame = 1;
118 
119  return avpkt->size;
120 }
121 
123  .name = "avui",
124  .long_name = NULL_IF_CONFIG_SMALL("Avid Meridien Uncompressed"),
125  .type = AVMEDIA_TYPE_VIDEO,
126  .id = AV_CODEC_ID_AVUI,
127  .init = avui_decode_init,
128  .decode = avui_decode_frame,
129  .capabilities = AV_CODEC_CAP_DR1,
130 };
This structure describes decoded (raw) audio or video data.
Definition: frame.h:180
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
int size
Definition: avcodec.h:1578
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1870
AVCodec.
Definition: avcodec.h:3535
uint8_t
#define av_cold
Definition: attributes.h:82
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1757
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32
Definition: bytestream.h:87
uint8_t * data
Definition: avcodec.h:1577
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:3035
#define av_log(a,...)
planar YUV 4:2:2 24bpp, (1 Cr & Cb sample per 2x1 Y & A samples)
Definition: pixfmt.h:187
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
const char * name
Name of the codec implementation.
Definition: avcodec.h:3542
static int avui_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: avuidec.c:33
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:254
uint8_t interlaced
Definition: mxfenc.c:1823
int width
picture width / height.
Definition: avcodec.h:1829
#define src
Definition: vp9dsp.c:530
AVCodec ff_avui_decoder
Definition: avuidec.c:122
Libavcodec external API header.
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:211
main external API structure.
Definition: avcodec.h:1642
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: utils.c:928
int extradata_size
Definition: avcodec.h:1758
#define u(width,...)
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:194
common internal api header.
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:249
This structure stores compressed data.
Definition: avcodec.h:1554
static av_cold int avui_decode_init(AVCodecContext *avctx)
Definition: avuidec.c:27
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:953