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  const AVPacket *pkt);
37 };
38 
39 /* For this format, it's a simple passthrough */
41  const 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  if (!frame->buf[0]) {
49  return AVERROR(ENOMEM);
50  }
51 
52  ret = av_image_fill_arrays(frame->data, frame->linesize, avpkt->data,
53  avctx->pix_fmt, avctx->width, avctx->height, 1);
54  if (ret < 0) {
55  av_buffer_unref(&frame->buf[0]);
56  return ret;
57  }
58 
59  return 0;
60 }
61 
63  const AVPacket *avpkt)
64 {
65  uint64_t frame_size = (uint64_t)avctx->width * (uint64_t)avctx->height * 20;
66  uint64_t packet_size = (uint64_t)avpkt->size * 8;
67  GetBitContext bc;
68  uint16_t *y, *u, *v;
69  int ret, i, j;
70 
71  ret = ff_get_buffer(avctx, frame, 0);
72  if (ret < 0)
73  return ret;
74 
75  if (frame_size > packet_size)
76  return AVERROR_INVALIDDATA;
77 
78  if (avctx->width % 2)
79  return AVERROR_PATCHWELCOME;
80 
81  ret = init_get_bits(&bc, avpkt->data, avctx->width * avctx->height * 20);
82  if (ret)
83  return ret;
84 
85  for (i = 0; i < avctx->height; i++) {
86  y = (uint16_t*)(frame->data[0] + i * frame->linesize[0]);
87  u = (uint16_t*)(frame->data[1] + i * frame->linesize[1]);
88  v = (uint16_t*)(frame->data[2] + i * frame->linesize[2]);
89 
90  for (j = 0; j < avctx->width; j += 2) {
91  *u++ = get_bits(&bc, 10);
92  *y++ = get_bits(&bc, 10);
93  *v++ = get_bits(&bc, 10);
94  *y++ = get_bits(&bc, 10);
95  }
96  }
97 
98  return 0;
99 }
100 
102 {
103  struct BitpackedContext *bc = avctx->priv_data;
104 
105  if (!avctx->codec_tag || !avctx->width || !avctx->height)
106  return AVERROR_INVALIDDATA;
107 
108  if (avctx->codec_tag == MKTAG('U', 'Y', 'V', 'Y')) {
109  if (avctx->bits_per_coded_sample == 16 &&
110  avctx->pix_fmt == AV_PIX_FMT_UYVY422)
112  else if (avctx->bits_per_coded_sample == 20 &&
113  avctx->pix_fmt == AV_PIX_FMT_YUV422P10)
115  else
116  return AVERROR_INVALIDDATA;
117  } else {
118  return AVERROR_INVALIDDATA;
119  }
120 
121  return 0;
122 }
123 
124 static int bitpacked_decode(AVCodecContext *avctx, void *data, int *got_frame,
125  AVPacket *avpkt)
126 {
127  struct BitpackedContext *bc = avctx->priv_data;
128  int buf_size = avpkt->size;
129  AVFrame *frame = data;
130  int res;
131 
132  frame->pict_type = AV_PICTURE_TYPE_I;
133  frame->key_frame = 1;
134 
135  res = bc->decode(avctx, frame, avpkt);
136  if (res)
137  return res;
138 
139  *got_frame = 1;
140  return buf_size;
141 
142 }
143 
145  .name = "bitpacked",
146  .long_name = NULL_IF_CONFIG_SMALL("Bitpacked"),
147  .type = AVMEDIA_TYPE_VIDEO,
148  .id = AV_CODEC_ID_BITPACKED,
149  .priv_data_size = sizeof(struct BitpackedContext),
151  .decode = bitpacked_decode,
152  .capabilities = AV_CODEC_CAP_EXPERIMENTAL,
153  .codec_tags = (const uint32_t []){
154  MKTAG('U', 'Y', 'V', 'Y'),
156  },
157  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
158 };
AVCodec
AVCodec.
Definition: codec.h:202
FF_CODEC_CAP_INIT_THREADSAFE
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
Definition: internal.h:42
init
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:31
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
u
#define u(width, name, range_min, range_max)
Definition: cbs_h2645.c:264
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:303
internal.h
AVPacket::data
uint8_t * data
Definition: packet.h:373
data
const char data[16]
Definition: mxf.c:143
av_buffer_ref
AVBufferRef * av_buffer_ref(const AVBufferRef *buf)
Create a new reference to an AVBuffer.
Definition: buffer.c:103
init_get_bits
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:660
bitpacked_decode_yuv422p10
static int bitpacked_decode_yuv422p10(AVCodecContext *avctx, AVFrame *frame, const AVPacket *avpkt)
Definition: bitpacked.c:62
get_bits
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:380
GetBitContext
Definition: get_bits.h:62
bitpacked_decode
static int bitpacked_decode(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: bitpacked.c:124
pkt
AVPacket * pkt
Definition: movenc.c:59
AV_CODEC_CAP_EXPERIMENTAL
#define AV_CODEC_CAP_EXPERIMENTAL
Codec is experimental and is thus avoided in favor of non experimental encoders.
Definition: codec.h:105
av_cold
#define av_cold
Definition: attributes.h:90
FF_CODEC_TAGS_END
#define FF_CODEC_TAGS_END
AVCodec.codec_tags termination value.
Definition: internal.h:91
frame_size
int frame_size
Definition: mxfenc.c:2205
get_bits.h
AVPacket::buf
AVBufferRef * buf
A reference to the reference-counted buffer where the packet data is stored.
Definition: packet.h:356
AVERROR_PATCHWELCOME
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:64
av_buffer_unref
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:139
AV_PICTURE_TYPE_I
@ AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:274
AV_PIX_FMT_YUV422P10
#define AV_PIX_FMT_YUV422P10
Definition: pixfmt.h:392
bitpacked_decode_uyvy422
static int bitpacked_decode_uyvy422(AVCodecContext *avctx, AVFrame *frame, const AVPacket *avpkt)
Definition: bitpacked.c:40
BitpackedContext
Definition: bitpacked.c:34
ff_get_buffer
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1652
AVPacket::size
int size
Definition: packet.h:374
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
av_image_fill_arrays
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:446
AV_CODEC_ID_BITPACKED
@ AV_CODEC_ID_BITPACKED
Definition: codec_id.h:280
AVCodecContext::bits_per_coded_sample
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:1418
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:271
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:209
AVCodecContext::height
int height
Definition: avcodec.h:556
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:593
avcodec.h
ret
ret
Definition: filter_design.txt:187
frame
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
Definition: filter_design.txt:264
ff_bitpacked_decoder
const AVCodec ff_bitpacked_decoder
Definition: bitpacked.c:144
AV_PIX_FMT_UYVY422
@ AV_PIX_FMT_UYVY422
packed YUV 4:2:2, 16bpp, Cb Y0 Cr Y1
Definition: pixfmt.h:81
AVCodecContext
main external API structure.
Definition: avcodec.h:383
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
BitpackedContext::decode
int(* decode)(AVCodecContext *avctx, AVFrame *frame, const AVPacket *pkt)
Definition: bitpacked.c:35
AVCodecContext::codec_tag
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:408
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:410
AVPacket
This structure stores compressed data.
Definition: packet.h:350
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:556
imgutils.h
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
MKTAG
#define MKTAG(a, b, c, d)
Definition: macros.h:55
int
int
Definition: ffmpeg_filter.c:156
bitpacked_init_decoder
static av_cold int bitpacked_init_decoder(AVCodecContext *avctx)
Definition: bitpacked.c:101