FFmpeg
bitpacked_dec.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 "codec_internal.h"
31 #include "libavutil/imgutils.h"
32 #include "thread.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  uint8_t *src;
68  uint16_t *y, *u, *v;
69  int ret, i, j;
70 
71  ret = ff_thread_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  src = avpkt->data;
82  for (i = 0; i < avctx->height; i++) {
83  y = (uint16_t*)(frame->data[0] + i * frame->linesize[0]);
84  u = (uint16_t*)(frame->data[1] + i * frame->linesize[1]);
85  v = (uint16_t*)(frame->data[2] + i * frame->linesize[2]);
86 
87  for (j = 0; j < avctx->width; j += 2) {
88  *u++ = (src[0] << 2) | (src[1] >> 6);
89  *v++ = ((src[2] << 6) | (src[3] >> 2)) & 0x3ff;
90  *y++ = ((src[1] << 4) | (src[2] >> 4)) & 0x3ff;
91  *y++ = ((src[3] << 8) | (src[4])) & 0x3ff;
92  src += 5;
93  }
94  }
95 
96  return 0;
97 }
98 
100 {
101  struct BitpackedContext *bc = avctx->priv_data;
102 
103  if (!avctx->codec_tag || !avctx->width || !avctx->height)
104  return AVERROR_INVALIDDATA;
105 
106  if (avctx->codec_tag == MKTAG('U', 'Y', 'V', 'Y')) {
107  if (avctx->bits_per_coded_sample == 16 &&
108  avctx->pix_fmt == AV_PIX_FMT_UYVY422)
110  else if (avctx->bits_per_coded_sample == 20 &&
111  avctx->pix_fmt == AV_PIX_FMT_YUV422P10)
113  else
114  return AVERROR_INVALIDDATA;
115  } else {
116  return AVERROR_INVALIDDATA;
117  }
118 
119  return 0;
120 }
121 
123  int *got_frame, AVPacket *avpkt)
124 {
125  struct BitpackedContext *bc = avctx->priv_data;
126  int buf_size = avpkt->size;
127  int res;
128 
129  res = bc->decode(avctx, frame, avpkt);
130  if (res)
131  return res;
132 
133  *got_frame = 1;
134  return buf_size;
135 
136 }
137 
139  .p.name = "bitpacked",
140  CODEC_LONG_NAME("Bitpacked"),
141  .p.type = AVMEDIA_TYPE_VIDEO,
142  .p.id = AV_CODEC_ID_BITPACKED,
143  .p.capabilities = AV_CODEC_CAP_FRAME_THREADS,
144  .priv_data_size = sizeof(struct BitpackedContext),
147  .codec_tags = (const uint32_t []){
148  MKTAG('U', 'Y', 'V', 'Y'),
150  },
151 };
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:251
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:374
bitpacked_decode
static int bitpacked_decode(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *avpkt)
Definition: bitpacked_dec.c:122
AVPacket::data
uint8_t * data
Definition: packet.h:520
FFCodec
Definition: codec_internal.h:126
av_buffer_ref
AVBufferRef * av_buffer_ref(const AVBufferRef *buf)
Create a new reference to an AVBuffer.
Definition: buffer.c:103
thread.h
FFCodec::p
AVCodec p
The public AVCodec.
Definition: codec_internal.h:130
FF_CODEC_TAGS_END
#define FF_CODEC_TAGS_END
FFCodec.codec_tags termination value.
Definition: codec_internal.h:94
pkt
AVPacket * pkt
Definition: movenc.c:60
av_cold
#define av_cold
Definition: attributes.h:90
FF_CODEC_DECODE_CB
#define FF_CODEC_DECODE_CB(func)
Definition: codec_internal.h:286
frame_size
int frame_size
Definition: mxfenc.c:2423
ff_thread_get_buffer
int ff_thread_get_buffer(AVCodecContext *avctx, AVFrame *f, int flags)
Wrapper around get_buffer() for frame-multithreaded codecs.
Definition: pthread_frame.c:986
bitpacked_init_decoder
static av_cold int bitpacked_init_decoder(AVCodecContext *avctx)
Definition: bitpacked_dec.c:99
CODEC_LONG_NAME
#define CODEC_LONG_NAME(str)
Definition: codec_internal.h:271
AV_CODEC_CAP_FRAME_THREADS
#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: codec.h:110
bitpacked_decode_yuv422p10
static int bitpacked_decode_yuv422p10(AVCodecContext *avctx, AVFrame *frame, const AVPacket *avpkt)
Definition: bitpacked_dec.c:62
AVPacket::buf
AVBufferRef * buf
A reference to the reference-counted buffer where the packet data is stored.
Definition: packet.h:503
ff_bitpacked_decoder
const FFCodec ff_bitpacked_decoder
Definition: bitpacked_dec.c:138
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_PIX_FMT_YUV422P10
#define AV_PIX_FMT_YUV422P10
Definition: pixfmt.h:479
BitpackedContext
Definition: bitpacked_dec.c:34
init
int(* init)(AVBSFContext *ctx)
Definition: dts2pts.c:366
AVPacket::size
int size
Definition: packet.h:521
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
codec_internal.h
AV_CODEC_ID_BITPACKED
@ AV_CODEC_ID_BITPACKED
Definition: codec_id.h:281
AVCodecContext::bits_per_coded_sample
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:1568
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:256
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:194
AVCodecContext::height
int height
Definition: avcodec.h:618
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:657
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
bitpacked_decode_uyvy422
static int bitpacked_decode_uyvy422(AVCodecContext *avctx, AVFrame *frame, const AVPacket *avpkt)
Definition: bitpacked_dec.c:40
AV_PIX_FMT_UYVY422
@ AV_PIX_FMT_UYVY422
packed YUV 4:2:2, 16bpp, Cb Y0 Cr Y1
Definition: pixfmt.h:88
AVCodecContext
main external API structure.
Definition: avcodec.h:445
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
BitpackedContext::decode
int(* decode)(AVCodecContext *avctx, AVFrame *frame, const AVPacket *pkt)
Definition: bitpacked_dec.c:35
AVCodecContext::codec_tag
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:470
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:472
AVPacket
This structure stores compressed data.
Definition: packet.h:497
src
INIT_CLIP pixel * src
Definition: h264pred_template.c:418
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:618
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:424