FFmpeg  4.4.4
8bps.c
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1 /*
2  * Quicktime Planar RGB (8BPS) Video Decoder
3  * Copyright (C) 2003 Roberto Togni
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  * QT 8BPS Video Decoder by Roberto Togni
25  * For more information about the 8BPS format, visit:
26  * http://www.pcisys.net/~melanson/codecs/
27  *
28  * Supports: PAL8 (RGB 8bpp, paletted)
29  * : BGR24 (RGB 24bpp) (can also output it as RGB32)
30  * : RGB32 (RGB 32bpp, 4th plane is alpha)
31  */
32 
33 #include <stdio.h>
34 #include <stdlib.h>
35 #include <string.h>
36 
37 #include "libavutil/internal.h"
38 #include "libavutil/intreadwrite.h"
39 #include "avcodec.h"
40 #include "internal.h"
41 
42 
43 static const enum AVPixelFormat pixfmt_rgb24[] = {
45 
46 typedef struct EightBpsContext {
48 
49  unsigned char planes;
50  unsigned char planemap[4];
51 
52  uint32_t pal[256];
54 
55 static int decode_frame(AVCodecContext *avctx, void *data,
56  int *got_frame, AVPacket *avpkt)
57 {
58  AVFrame *frame = data;
59  const uint8_t *buf = avpkt->data;
60  int buf_size = avpkt->size;
61  EightBpsContext * const c = avctx->priv_data;
62  const unsigned char *encoded = buf;
63  unsigned char *pixptr, *pixptr_end;
64  unsigned int height = avctx->height; // Real image height
65  unsigned int dlen, p, row;
66  const unsigned char *lp, *dp, *ep;
67  unsigned char count;
68  unsigned int px_inc;
69  unsigned int planes = c->planes;
70  unsigned char *planemap = c->planemap;
71  int ret;
72 
73  if (buf_size < planes * height *2)
74  return AVERROR_INVALIDDATA;
75 
76  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
77  return ret;
78 
79  ep = encoded + buf_size;
80 
81  /* Set data pointer after line lengths */
82  dp = encoded + planes * (height << 1);
83 
84  px_inc = planes + (avctx->pix_fmt == AV_PIX_FMT_0RGB32);
85 
86  for (p = 0; p < planes; p++) {
87  /* Lines length pointer for this plane */
88  lp = encoded + p * (height << 1);
89 
90  /* Decode a plane */
91  for (row = 0; row < height; row++) {
92  pixptr = frame->data[0] + row * frame->linesize[0] + planemap[p];
93  pixptr_end = pixptr + frame->linesize[0];
94  if (ep - lp < row * 2 + 2)
95  return AVERROR_INVALIDDATA;
96  dlen = av_be2ne16(*(const unsigned short *)(lp + row * 2));
97  /* Decode a row of this plane */
98  while (dlen > 0) {
99  if (ep - dp <= 1)
100  return AVERROR_INVALIDDATA;
101  if ((count = *dp++) <= 127) {
102  count++;
103  dlen -= count + 1;
104  if (pixptr_end - pixptr < count * px_inc)
105  break;
106  if (ep - dp < count)
107  return AVERROR_INVALIDDATA;
108  while (count--) {
109  *pixptr = *dp++;
110  pixptr += px_inc;
111  }
112  } else {
113  count = 257 - count;
114  if (pixptr_end - pixptr < count * px_inc)
115  break;
116  while (count--) {
117  *pixptr = *dp;
118  pixptr += px_inc;
119  }
120  dp++;
121  dlen -= 2;
122  }
123  }
124  }
125  }
126 
127  if (avctx->bits_per_coded_sample <= 8) {
129  const uint8_t *pal = av_packet_get_side_data(avpkt,
131  &size);
132  if (pal && size == AVPALETTE_SIZE) {
134  memcpy(c->pal, pal, AVPALETTE_SIZE);
135  } else if (pal) {
136  av_log(avctx, AV_LOG_ERROR, "Palette size %d is wrong\n", size);
137  }
138 
139  memcpy (frame->data[1], c->pal, AVPALETTE_SIZE);
140  }
141 
142  *got_frame = 1;
143 
144  /* always report that the buffer was completely consumed */
145  return buf_size;
146 }
147 
149 {
150  EightBpsContext * const c = avctx->priv_data;
151 
152  c->avctx = avctx;
153 
154  switch (avctx->bits_per_coded_sample) {
155  case 8:
156  avctx->pix_fmt = AV_PIX_FMT_PAL8;
157  c->planes = 1;
158  c->planemap[0] = 0; // 1st plane is palette indexes
159  break;
160  case 24:
161  avctx->pix_fmt = ff_get_format(avctx, pixfmt_rgb24);
162  c->planes = 3;
163  c->planemap[0] = 2; // 1st plane is red
164  c->planemap[1] = 1; // 2nd plane is green
165  c->planemap[2] = 0; // 3rd plane is blue
166  break;
167  case 32:
168  avctx->pix_fmt = AV_PIX_FMT_RGB32;
169  c->planes = 4;
170  /* handle planemap setup later for decoding rgb24 data as rbg32 */
171  break;
172  default:
173  av_log(avctx, AV_LOG_ERROR, "Error: Unsupported color depth: %u.\n",
174  avctx->bits_per_coded_sample);
175  return AVERROR_INVALIDDATA;
176  }
177 
178  if (avctx->pix_fmt == AV_PIX_FMT_RGB32) {
179  c->planemap[0] = HAVE_BIGENDIAN ? 1 : 2; // 1st plane is red
180  c->planemap[1] = HAVE_BIGENDIAN ? 2 : 1; // 2nd plane is green
181  c->planemap[2] = HAVE_BIGENDIAN ? 3 : 0; // 3rd plane is blue
182  c->planemap[3] = HAVE_BIGENDIAN ? 0 : 3; // 4th plane is alpha
183  }
184  return 0;
185 }
186 
188  .name = "8bps",
189  .long_name = NULL_IF_CONFIG_SMALL("QuickTime 8BPS video"),
190  .type = AVMEDIA_TYPE_VIDEO,
191  .id = AV_CODEC_ID_8BPS,
192  .priv_data_size = sizeof(EightBpsContext),
193  .init = decode_init,
194  .decode = decode_frame,
195  .capabilities = AV_CODEC_CAP_DR1,
196 };
AVCodec ff_eightbps_decoder
Definition: 8bps.c:187
static enum AVPixelFormat pixfmt_rgb24[]
Definition: 8bps.c:43
static av_cold int decode_init(AVCodecContext *avctx)
Definition: 8bps.c:148
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: 8bps.c:55
#define av_cold
Definition: attributes.h:88
uint8_t
Libavcodec external API header.
uint8_t * av_packet_get_side_data(const AVPacket *pkt, enum AVPacketSideDataType type, buffer_size_t *size)
Definition: avpacket.c:368
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:31
#define av_be2ne16(x)
Definition: bswap.h:92
#define HAVE_BIGENDIAN
Definition: config.h:200
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1900
int ff_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt)
Select the (possibly hardware accelerated) pixel format.
Definition: decode.c:1326
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
static AVFrame * frame
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
@ AV_CODEC_ID_8BPS
Definition: codec_id.h:97
@ AV_PKT_DATA_PALETTE
An AV_PKT_DATA_PALETTE side data packet contains exactly AVPALETTE_SIZE bytes worth of palette.
Definition: packet.h:46
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
common internal API header
int buffer_size_t
Definition: internal.h:306
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
static const struct @322 planes[]
const char data[16]
Definition: mxf.c:142
#define AV_PIX_FMT_0RGB32
Definition: pixfmt.h:376
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
@ AV_PIX_FMT_NONE
Definition: pixfmt.h:65
@ AV_PIX_FMT_PAL8
8 bits with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:77
@ AV_PIX_FMT_BGR24
packed RGB 8:8:8, 24bpp, BGRBGR...
Definition: pixfmt.h:69
#define AVPALETTE_SIZE
Definition: pixfmt.h:32
#define AV_PIX_FMT_RGB32
Definition: pixfmt.h:372
main external API structure.
Definition: avcodec.h:536
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:746
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:1740
void * priv_data
Definition: avcodec.h:563
AVCodec.
Definition: codec.h:197
const char * name
Name of the codec implementation.
Definition: codec.h:204
This structure describes decoded (raw) audio or video data.
Definition: frame.h:318
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:332
int palette_has_changed
Tell user application that palette has changed from previous frame.
Definition: frame.h:475
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:349
This structure stores compressed data.
Definition: packet.h:346
int size
Definition: packet.h:370
uint8_t * data
Definition: packet.h:369
unsigned char planes
Definition: 8bps.c:49
unsigned char planemap[4]
Definition: 8bps.c:50
uint32_t pal[256]
Definition: 8bps.c:52
AVCodecContext * avctx
Definition: 8bps.c:47
#define av_log(a,...)
#define height
int size
static double c[64]