Libav
yuv4mpegenc.c
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1 /*
2  * YUV4MPEG muxer
3  * Copyright (c) 2001, 2002, 2003 Fabrice Bellard
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 
22 #include "libavutil/pixdesc.h"
23 #include "avformat.h"
24 #include "internal.h"
25 #include "yuv4mpeg.h"
26 
27 #define Y4M_LINE_MAX 256
28 
29 static int yuv4_generate_header(AVFormatContext *s, char* buf)
30 {
31  AVStream *st;
32  int width, height;
33  int raten, rated, aspectn, aspectd, n;
34  char inter;
35  const char *colorspace = "";
36 
37  st = s->streams[0];
38  width = st->codec->width;
39  height = st->codec->height;
40 
41  // TODO: should be avg_frame_rate
42  av_reduce(&raten, &rated, st->time_base.den,
43  st->time_base.num, (1UL << 31) - 1);
44 
45  aspectn = st->sample_aspect_ratio.num;
46  aspectd = st->sample_aspect_ratio.den;
47 
48  if (aspectn == 0 && aspectd == 1)
49  aspectd = 0; // 0:0 means unknown
50 
51  switch (st->codec->field_order) {
52  case AV_FIELD_TT: inter = 't'; break;
53  case AV_FIELD_BB: inter = 'b'; break;
54  default: inter = 'p'; break;
55  }
56 
57  switch (st->codec->pix_fmt) {
58  case AV_PIX_FMT_GRAY8:
59  colorspace = " Cmono";
60  break;
61  case AV_PIX_FMT_YUV411P:
62  colorspace = " C411 XYSCSS=411";
63  break;
64  case AV_PIX_FMT_YUV420P:
65  switch (st->codec->chroma_sample_location) {
66  case AVCHROMA_LOC_TOPLEFT: colorspace = " C420paldv XYSCSS=420PALDV"; break;
67  case AVCHROMA_LOC_LEFT: colorspace = " C420mpeg2 XYSCSS=420MPEG2"; break;
68  default: colorspace = " C420jpeg XYSCSS=420JPEG"; break;
69  }
70  break;
71  case AV_PIX_FMT_YUV422P:
72  colorspace = " C422 XYSCSS=422";
73  break;
74  case AV_PIX_FMT_YUV444P:
75  colorspace = " C444 XYSCSS=444";
76  break;
77  }
78 
79  /* construct stream header, if this is the first frame */
80  n = snprintf(buf, Y4M_LINE_MAX, "%s W%d H%d F%d:%d I%c A%d:%d%s\n",
81  Y4M_MAGIC, width, height, raten, rated, inter,
82  aspectn, aspectd, colorspace);
83 
84  return n;
85 }
86 
88 {
89  AVStream *st = s->streams[pkt->stream_index];
90  AVIOContext *pb = s->pb;
91  AVPicture *picture;
92  int* first_pkt = s->priv_data;
93  int width, height, h_chroma_shift, v_chroma_shift;
94  int i;
95  char buf2[Y4M_LINE_MAX + 1];
96  char buf1[20];
97  uint8_t *ptr, *ptr1, *ptr2;
98 
99  picture = (AVPicture *)pkt->data;
100 
101  /* for the first packet we have to output the header as well */
102  if (*first_pkt) {
103  *first_pkt = 0;
104  if (yuv4_generate_header(s, buf2) < 0) {
105  av_log(s, AV_LOG_ERROR,
106  "Error. YUV4MPEG stream header write failed.\n");
107  return AVERROR(EIO);
108  } else {
109  avio_write(pb, buf2, strlen(buf2));
110  }
111  }
112 
113  /* construct frame header */
114 
115  snprintf(buf1, sizeof(buf1), "%s\n", Y4M_FRAME_MAGIC);
116  avio_write(pb, buf1, strlen(buf1));
117 
118  width = st->codec->width;
119  height = st->codec->height;
120 
121  ptr = picture->data[0];
122  for (i = 0; i < height; i++) {
123  avio_write(pb, ptr, width);
124  ptr += picture->linesize[0];
125  }
126 
127  if (st->codec->pix_fmt != AV_PIX_FMT_GRAY8) {
128  // Adjust for smaller Cb and Cr planes
129  av_pix_fmt_get_chroma_sub_sample(st->codec->pix_fmt, &h_chroma_shift,
130  &v_chroma_shift);
131  // Shift right, rounding up
132  width = -(-width >> h_chroma_shift);
133  height = -(-height >> v_chroma_shift);
134 
135  ptr1 = picture->data[1];
136  ptr2 = picture->data[2];
137  for (i = 0; i < height; i++) { /* Cb */
138  avio_write(pb, ptr1, width);
139  ptr1 += picture->linesize[1];
140  }
141  for (i = 0; i < height; i++) { /* Cr */
142  avio_write(pb, ptr2, width);
143  ptr2 += picture->linesize[2];
144  }
145  }
146  return 0;
147 }
148 
150 {
151  int *first_pkt = s->priv_data;
152 
153  if (s->nb_streams != 1)
154  return AVERROR(EIO);
155 
156  if (s->streams[0]->codec->codec_id != AV_CODEC_ID_RAWVIDEO) {
157  av_log(s, AV_LOG_ERROR, "ERROR: Only rawvideo supported.\n");
158  return AVERROR_INVALIDDATA;
159  }
160 
161  if (s->streams[0]->codec->pix_fmt == AV_PIX_FMT_YUV411P) {
162  av_log(s, AV_LOG_ERROR, "Warning: generating rarely used 4:1:1 YUV "
163  "stream, some mjpegtools might not work.\n");
164  } else if ((s->streams[0]->codec->pix_fmt != AV_PIX_FMT_YUV420P) &&
165  (s->streams[0]->codec->pix_fmt != AV_PIX_FMT_YUV422P) &&
166  (s->streams[0]->codec->pix_fmt != AV_PIX_FMT_GRAY8) &&
167  (s->streams[0]->codec->pix_fmt != AV_PIX_FMT_YUV444P)) {
168  av_log(s, AV_LOG_ERROR, "ERROR: yuv4mpeg only handles yuv444p, "
169  "yuv422p, yuv420p, yuv411p and gray pixel formats. "
170  "Use -pix_fmt to select one.\n");
171  return AVERROR(EIO);
172  }
173 
174  *first_pkt = 1;
175  return 0;
176 }
177 
179  .name = "yuv4mpegpipe",
180  .long_name = NULL_IF_CONFIG_SMALL("YUV4MPEG pipe"),
181  .mime_type = "",
182  .extensions = "y4m",
183  .priv_data_size = sizeof(int),
184  .audio_codec = AV_CODEC_ID_NONE,
185  .video_codec = AV_CODEC_ID_RAWVIDEO,
189 };
AVOutputFormat ff_yuv4mpegpipe_muxer
Definition: yuv4mpegenc.c:178
Bytestream IO Context.
Definition: avio.h:68
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:54
int linesize[AV_NUM_DATA_POINTERS]
number of bytes per line
Definition: avcodec.h:3044
mpeg2/4, h264 default
Definition: pixfmt.h:378
static int yuv4_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: yuv4mpegenc.c:87
planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
Definition: pixfmt.h:70
static int write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: assenc.c:58
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:769
int num
numerator
Definition: rational.h:44
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1270
four components are given, that&#39;s all.
Definition: avcodec.h:3042
Format I/O context.
Definition: avformat.h:922
uint8_t
uint8_t * data[AV_NUM_DATA_POINTERS]
Definition: avcodec.h:3043
#define Y4M_FRAME_MAGIC
Definition: yuv4mpeg.h:25
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:990
uint8_t * data
Definition: avcodec.h:973
static int flags
Definition: log.c:44
#define Y4M_LINE_MAX
Definition: yuv4mpegenc.c:27
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:165
enum AVChromaLocation chroma_sample_location
This defines the location of chroma samples.
Definition: avcodec.h:1789
#define Y4M_MAGIC
Definition: yuv4mpeg.h:24
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:123
#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:145
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:169
planar YUV 4:2:2, 16bpp, (1 Cr & Cb sample per 2x1 Y samples)
Definition: pixfmt.h:69
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:718
int av_reduce(int *dst_num, int *dst_den, int64_t num, int64_t den, int64_t max)
Reduce a fraction.
Definition: rational.c:35
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:978
int width
picture width / height.
Definition: avcodec.h:1229
const char * name
Definition: avformat.h:446
if(ac->has_optimized_func)
Stream structure.
Definition: avformat.h:699
static int width
Definition: utils.c:156
enum AVCodecID codec_id
Definition: avcodec.h:1067
AVIOContext * pb
I/O context.
Definition: avformat.h:964
#define AVFMT_RAWPICTURE
Format wants AVPicture structure for raw picture data.
Definition: avformat.h:412
int height
Definition: gxfenc.c:72
Main libavformat public API header.
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:65
Y , 8bpp.
Definition: pixfmt.h:73
FF_ENABLE_DEPRECATION_WARNINGS int av_pix_fmt_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift)
Utility function to access log2_chroma_w log2_chroma_h from the pixel format AVPixFmtDescriptor.
Definition: pixdesc.c:1625
planar YUV 4:1:1, 12bpp, (1 Cr & Cb sample per 4x1 Y samples)
Definition: pixfmt.h:72
int den
denominator
Definition: rational.h:45
static int yuv4_generate_header(AVFormatContext *s, char *buf)
Definition: yuv4mpegenc.c:29
void * priv_data
Format private data.
Definition: avformat.h:950
static void write_header(FFV1Context *f)
Definition: ffv1enc.c:380
enum AVFieldOrder field_order
Field order.
Definition: avcodec.h:1804
enum AVColorSpace colorspace
Definition: dirac.c:100
int stream_index
Definition: avcodec.h:975
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avformat.h:741
static int yuv4_write_header(AVFormatContext *s)
Definition: yuv4mpegenc.c:149
This structure stores compressed data.
Definition: avcodec.h:950