FFmpeg
bitpacked.c
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1 /*
2  * Unpack bit-packed streams to formats supported by FFmpeg
3  * Copyright (c) 2017 Savoir-faire Linux, Inc
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 /* Development sponsored by CBC/Radio-Canada */
23 
24 /**
25  * @file
26  * Bitpacked
27  */
28 
29 #include "avcodec.h"
30 #include "internal.h"
31 #include "get_bits.h"
32 #include "libavutil/imgutils.h"
33 
36  AVPacket *pkt);
37 };
38 
39 /* For this format, it's a simple passthrough */
41  AVPacket *avpkt)
42 {
43  int ret;
44 
45  /* there is no need to copy as the data already match
46  * a known pixel format */
47  frame->buf[0] = av_buffer_ref(avpkt->buf);
48  ret = av_image_fill_arrays(frame->data, frame->linesize, avpkt->data,
49  avctx->pix_fmt, avctx->width, avctx->height, 1);
50  if (ret < 0) {
51  av_buffer_unref(&frame->buf[0]);
52  return ret;
53  }
54 
55  return 0;
56 }
57 
59  AVPacket *avpkt)
60 {
61  uint64_t frame_size = (uint64_t)avctx->width * (uint64_t)avctx->height * 20;
62  uint64_t packet_size = (uint64_t)avpkt->size * 8;
63  GetBitContext bc;
64  uint16_t *y, *u, *v;
65  int ret, i, j;
66 
67  ret = ff_get_buffer(avctx, frame, 0);
68  if (ret < 0)
69  return ret;
70 
71  if (frame_size > packet_size)
72  return AVERROR_INVALIDDATA;
73 
74  if (avctx->width % 2)
75  return AVERROR_PATCHWELCOME;
76 
77  ret = init_get_bits(&bc, avpkt->data, avctx->width * avctx->height * 20);
78  if (ret)
79  return ret;
80 
81  for (i = 0; i < avctx->height; i++) {
82  y = (uint16_t*)(frame->data[0] + i * frame->linesize[0]);
83  u = (uint16_t*)(frame->data[1] + i * frame->linesize[1]);
84  v = (uint16_t*)(frame->data[2] + i * frame->linesize[2]);
85 
86  for (j = 0; j < avctx->width; j += 2) {
87  *u++ = get_bits(&bc, 10);
88  *y++ = get_bits(&bc, 10);
89  *v++ = get_bits(&bc, 10);
90  *y++ = get_bits(&bc, 10);
91  }
92  }
93 
94  return 0;
95 }
96 
98 {
99  struct BitpackedContext *bc = avctx->priv_data;
100 
101  if (!avctx->codec_tag || !avctx->width || !avctx->height)
102  return AVERROR_INVALIDDATA;
103 
104  if (avctx->codec_tag == MKTAG('U', 'Y', 'V', 'Y')) {
105  if (avctx->bits_per_coded_sample == 16 &&
106  avctx->pix_fmt == AV_PIX_FMT_UYVY422)
108  else if (avctx->bits_per_coded_sample == 20 &&
109  avctx->pix_fmt == AV_PIX_FMT_YUV422P10)
111  else
112  return AVERROR_INVALIDDATA;
113  } else {
114  return AVERROR_INVALIDDATA;
115  }
116 
117  return 0;
118 }
119 
120 static int bitpacked_decode(AVCodecContext *avctx, void *data, int *got_frame,
121  AVPacket *avpkt)
122 {
123  struct BitpackedContext *bc = avctx->priv_data;
124  int buf_size = avpkt->size;
125  AVFrame *frame = data;
126  int res;
127 
128  frame->pict_type = AV_PICTURE_TYPE_I;
129  frame->key_frame = 1;
130 
131  res = bc->decode(avctx, frame, avpkt);
132  if (res)
133  return res;
134 
135  *got_frame = 1;
136  return buf_size;
137 
138 }
139 
141  .name = "bitpacked",
142  .long_name = NULL_IF_CONFIG_SMALL("Bitpacked"),
143  .type = AVMEDIA_TYPE_VIDEO,
144  .id = AV_CODEC_ID_BITPACKED,
145  .priv_data_size = sizeof(struct BitpackedContext),
146  .init = bitpacked_init_decoder,
147  .decode = bitpacked_decode,
148  .capabilities = AV_CODEC_CAP_EXPERIMENTAL,
149 };
packed YUV 4:2:2, 16bpp, Cb Y0 Cr Y1
Definition: pixfmt.h:81
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
void av_buffer_unref(AVBufferRef **buf)
Free a given reference and automatically free the buffer if there are no more references to it...
Definition: buffer.c:125
This structure describes decoded (raw) audio or video data.
Definition: frame.h:295
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:100
misc image utilities
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:379
AVBufferRef * buf[AV_NUM_DATA_POINTERS]
AVBuffer references backing the data for this frame.
Definition: frame.h:486
int size
Definition: avcodec.h:1481
int av_image_fill_arrays(uint8_t *dst_data[4], int dst_linesize[4], const uint8_t *src, enum AVPixelFormat pix_fmt, int width, int height, int align)
Setup the data pointers and linesizes based on the specified image parameters and the provided array...
Definition: imgutils.c:411
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1778
#define AV_CODEC_CAP_EXPERIMENTAL
Codec is experimental and is thus avoided in favor of non experimental encoders.
Definition: avcodec.h:1032
static AVPacket pkt
AVCodec.
Definition: avcodec.h:3492
#define av_cold
Definition: attributes.h:82
#define u(width, name, range_min, range_max)
Definition: cbs_h2645.c:252
static av_cold int bitpacked_init_decoder(AVCodecContext *avctx)
Definition: bitpacked.c:97
uint8_t * data
Definition: avcodec.h:1480
bitstream reader API header.
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:2792
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
static int bitpacked_decode_uyvy422(AVCodecContext *avctx, AVFrame *frame, AVPacket *avpkt)
Definition: bitpacked.c:40
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
AVBufferRef * buf
A reference to the reference-counted buffer where the packet data is stored.
Definition: avcodec.h:1463
const char * name
Name of the codec implementation.
Definition: avcodec.h:3499
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:378
int width
picture width / height.
Definition: avcodec.h:1741
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
int frame_size
Definition: mxfenc.c:2223
Libavcodec external API header.
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:326
main external API structure.
Definition: avcodec.h:1568
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> (&#39;D&#39;<<24) + (&#39;C&#39;<<16) + (&#39;B&#39;<<8) + &#39;A&#39;).
Definition: avcodec.h:1593
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1968
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:659
static int bitpacked_decode_yuv422p10(AVCodecContext *avctx, AVFrame *frame, AVPacket *avpkt)
Definition: bitpacked.c:58
#define AV_PIX_FMT_YUV422P10
Definition: pixfmt.h:388
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:309
int
common internal api header.
AVBufferRef * av_buffer_ref(AVBufferRef *buf)
Create a new reference to an AVBuffer.
Definition: buffer.c:93
static int bitpacked_decode(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: bitpacked.c:120
void * priv_data
Definition: avcodec.h:1595
int(* decode)(AVCodecContext *avctx, AVFrame *frame, AVPacket *pkt)
Definition: bitpacked.c:35
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:373
#define MKTAG(a, b, c, d)
Definition: common.h:366
This structure stores compressed data.
Definition: avcodec.h:1457
AVCodec ff_bitpacked_decoder
Definition: bitpacked.c:140