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aliaspixenc.c
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1 /*
2  * Alias PIX image encoder
3  * Copyright (C) 2014 Vittorio Giovara <vittorio.giovara@gmail.com>
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 #include "libavutil/intreadwrite.h"
23 
24 #include "avcodec.h"
25 #include "bytestream.h"
26 #include "internal.h"
27 
28 #define ALIAS_HEADER_SIZE 10
29 
31  const AVFrame *frame, int *got_packet)
32 {
33  int width, height, bits_pixel, i, j, length, ret;
34  uint8_t *in_buf, *buf;
35 
36 #if FF_API_CODED_FRAME
39  avctx->coded_frame->key_frame = 1;
41 #endif
42 
43  width = avctx->width;
44  height = avctx->height;
45 
46  if (width > 65535 || height > 65535 ||
47  width * height >= INT_MAX / 4 - ALIAS_HEADER_SIZE) {
48  av_log(avctx, AV_LOG_ERROR, "Invalid image size %dx%d.\n", width, height);
49  return AVERROR_INVALIDDATA;
50  }
51 
52  switch (avctx->pix_fmt) {
53  case AV_PIX_FMT_GRAY8:
54  bits_pixel = 8;
55  break;
56  case AV_PIX_FMT_BGR24:
57  bits_pixel = 24;
58  break;
59  default:
60  return AVERROR(EINVAL);
61  }
62 
63  length = ALIAS_HEADER_SIZE + 4 * width * height; // max possible
64  if ((ret = ff_alloc_packet2(avctx, pkt, length, ALIAS_HEADER_SIZE + height*2)) < 0) {
65  av_log(avctx, AV_LOG_ERROR, "Error getting output packet of size %d.\n", length);
66  return ret;
67  }
68 
69  buf = pkt->data;
70 
71  /* Encode header. */
72  bytestream_put_be16(&buf, width);
73  bytestream_put_be16(&buf, height);
74  bytestream_put_be32(&buf, 0); /* X, Y offset */
75  bytestream_put_be16(&buf, bits_pixel);
76 
77  for (j = 0; j < height; j++) {
78  in_buf = frame->data[0] + frame->linesize[0] * j;
79  for (i = 0; i < width; ) {
80  int count = 0;
81  int pixel;
82 
83  if (avctx->pix_fmt == AV_PIX_FMT_GRAY8) {
84  pixel = *in_buf;
85  while (count < 255 && count + i < width && pixel == *in_buf) {
86  count++;
87  in_buf++;
88  }
89  bytestream_put_byte(&buf, count);
90  bytestream_put_byte(&buf, pixel);
91  } else { /* AV_PIX_FMT_BGR24 */
92  pixel = AV_RB24(in_buf);
93  while (count < 255 && count + i < width &&
94  pixel == AV_RB24(in_buf)) {
95  count++;
96  in_buf += 3;
97  }
98  bytestream_put_byte(&buf, count);
99  bytestream_put_be24(&buf, pixel);
100  }
101  i += count;
102  }
103  }
104 
105  /* Total length */
106  av_shrink_packet(pkt, buf - pkt->data);
107  pkt->flags |= AV_PKT_FLAG_KEY;
108  *got_packet = 1;
109 
110  return 0;
111 }
112 
114  .name = "alias_pix",
115  .long_name = NULL_IF_CONFIG_SMALL("Alias/Wavefront PIX image"),
116  .type = AVMEDIA_TYPE_VIDEO,
117  .id = AV_CODEC_ID_ALIAS_PIX,
118  .encode2 = encode_frame,
119  .pix_fmts = (const enum AVPixelFormat[]) {
121  },
122 };
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
This structure describes decoded (raw) audio or video data.
Definition: frame.h:201
void av_shrink_packet(AVPacket *pkt, int size)
Reduce packet size, correctly zeroing padding.
Definition: avpacket.c:101
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1711
static AVPacket pkt
AVCodec.
Definition: avcodec.h:3365
int ff_alloc_packet2(AVCodecContext *avctx, AVPacket *avpkt, int64_t size, int64_t min_size)
Check AVPacket size and/or allocate data.
Definition: encode.c:32
uint8_t
static AVFrame * frame
#define height
uint8_t * data
Definition: avcodec.h:1414
#define av_log(a,...)
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1446
#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:186
#define ALIAS_HEADER_SIZE
Definition: aliaspixenc.c:28
uint16_t width
Definition: gdv.c:47
GLsizei GLsizei * length
Definition: opengl_enc.c:115
const char * name
Name of the codec implementation.
Definition: avcodec.h:3372
GLsizei count
Definition: opengl_enc.c:109
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1420
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:284
int width
picture width / height.
Definition: avcodec.h:1674
packed RGB 8:8:8, 24bpp, BGRBGR...
Definition: pixfmt.h:65
AVCodec ff_alias_pix_encoder
Definition: aliaspixenc.c:113
Libavcodec external API header.
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_WB32 unsigned int_TMPL AV_RB24
Definition: bytestream.h:87
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:232
main external API structure.
Definition: avcodec.h:1502
void * buf
Definition: avisynth_c.h:690
uint8_t pixel
Definition: tiny_ssim.c:42
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:215
Y , 8bpp.
Definition: pixfmt.h:70
#define FF_DISABLE_DEPRECATION_WARNINGS
Definition: internal.h:84
common internal api header.
attribute_deprecated AVFrame * coded_frame
the picture in the bitstream
Definition: avcodec.h:2744
#define FF_ENABLE_DEPRECATION_WARNINGS
Definition: internal.h:85
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:279
static int encode_frame(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *frame, int *got_packet)
Definition: aliaspixenc.c:30
AVPixelFormat
Pixel format.
Definition: pixfmt.h:60
This structure stores compressed data.
Definition: avcodec.h:1391