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 "get_bits.h"
32 #include "libavutil/imgutils.h"
33 #include "thread.h"
34 
37  const AVPacket *pkt);
38 };
39 
40 /* For this format, it's a simple passthrough */
42  const AVPacket *avpkt)
43 {
44  int ret;
45 
46  /* there is no need to copy as the data already match
47  * a known pixel format */
48  frame->buf[0] = av_buffer_ref(avpkt->buf);
49  if (!frame->buf[0]) {
50  return AVERROR(ENOMEM);
51  }
52 
53  ret = av_image_fill_arrays(frame->data, frame->linesize, avpkt->data,
54  avctx->pix_fmt, avctx->width, avctx->height, 1);
55  if (ret < 0) {
56  av_buffer_unref(&frame->buf[0]);
57  return ret;
58  }
59 
60  return 0;
61 }
62 
64  const AVPacket *avpkt)
65 {
66  uint64_t frame_size = (uint64_t)avctx->width * (uint64_t)avctx->height * 20;
67  uint64_t packet_size = (uint64_t)avpkt->size * 8;
68  GetBitContext bc;
69  uint16_t *y, *u, *v;
70  int ret, i, j;
71 
72  ret = ff_thread_get_buffer(avctx, frame, 0);
73  if (ret < 0)
74  return ret;
75 
76  if (frame_size > packet_size)
77  return AVERROR_INVALIDDATA;
78 
79  if (avctx->width % 2)
80  return AVERROR_PATCHWELCOME;
81 
82  ret = init_get_bits(&bc, avpkt->data, avctx->width * avctx->height * 20);
83  if (ret)
84  return ret;
85 
86  for (i = 0; i < avctx->height; i++) {
87  y = (uint16_t*)(frame->data[0] + i * frame->linesize[0]);
88  u = (uint16_t*)(frame->data[1] + i * frame->linesize[1]);
89  v = (uint16_t*)(frame->data[2] + i * frame->linesize[2]);
90 
91  for (j = 0; j < avctx->width; j += 2) {
92  *u++ = get_bits(&bc, 10);
93  *y++ = get_bits(&bc, 10);
94  *v++ = get_bits(&bc, 10);
95  *y++ = get_bits(&bc, 10);
96  }
97  }
98 
99  return 0;
100 }
101 
103 {
104  struct BitpackedContext *bc = avctx->priv_data;
105 
106  if (!avctx->codec_tag || !avctx->width || !avctx->height)
107  return AVERROR_INVALIDDATA;
108 
109  if (avctx->codec_tag == MKTAG('U', 'Y', 'V', 'Y')) {
110  if (avctx->bits_per_coded_sample == 16 &&
111  avctx->pix_fmt == AV_PIX_FMT_UYVY422)
113  else if (avctx->bits_per_coded_sample == 20 &&
114  avctx->pix_fmt == AV_PIX_FMT_YUV422P10)
116  else
117  return AVERROR_INVALIDDATA;
118  } else {
119  return AVERROR_INVALIDDATA;
120  }
121 
122  return 0;
123 }
124 
126  int *got_frame, AVPacket *avpkt)
127 {
128  struct BitpackedContext *bc = avctx->priv_data;
129  int buf_size = avpkt->size;
130  int res;
131 
132  res = bc->decode(avctx, frame, avpkt);
133  if (res)
134  return res;
135 
136  frame->pict_type = AV_PICTURE_TYPE_I;
137  frame->key_frame = 1;
138 
139  *got_frame = 1;
140  return buf_size;
141 
142 }
143 
145  .p.name = "bitpacked",
146  .p.long_name = NULL_IF_CONFIG_SMALL("Bitpacked"),
147  .p.type = AVMEDIA_TYPE_VIDEO,
148  .p.id = AV_CODEC_ID_BITPACKED,
149  .p.capabilities = AV_CODEC_CAP_FRAME_THREADS,
150  .priv_data_size = sizeof(struct BitpackedContext),
153  .codec_tags = (const uint32_t []){
154  MKTAG('U', 'Y', 'V', 'Y'),
156  },
157 };
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:262
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:325
bitpacked_decode
static int bitpacked_decode(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *avpkt)
Definition: bitpacked_dec.c:125
AVPacket::data
uint8_t * data
Definition: packet.h:374
FFCodec
Definition: codec_internal.h:118
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:649
thread.h
init
static int init
Definition: av_tx.c:47
get_bits
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:379
FFCodec::p
AVCodec p
The public AVCodec.
Definition: codec_internal.h:122
GetBitContext
Definition: get_bits.h:61
ff_thread_get_buffer
the pkt_dts and pkt_pts fields in AVFrame will work as usual Restrictions on codec whose streams don t reset across will not work because their bitstreams cannot be decoded in parallel *The contents of buffers must not be read before as well as code calling up to before the decode process starts Call have so the codec calls ff_thread_report set FF_CODEC_CAP_ALLOCATE_PROGRESS in AVCodec caps_internal and use ff_thread_get_buffer() to allocate frames. The frames must then be freed with ff_thread_release_buffer(). Otherwise decode directly into the user-supplied frames. Call ff_thread_report_progress() after some part of the current picture has decoded. A good place to put this is where draw_horiz_band() is called - add this if it isn 't called anywhere
FF_CODEC_TAGS_END
#define FF_CODEC_TAGS_END
FFCodec.codec_tags termination value.
Definition: codec_internal.h:86
pkt
AVPacket * pkt
Definition: movenc.c:59
av_cold
#define av_cold
Definition: attributes.h:90
FF_CODEC_DECODE_CB
#define FF_CODEC_DECODE_CB(func)
Definition: codec_internal.h:260
frame_size
int frame_size
Definition: mxfenc.c:2201
bitpacked_init_decoder
static av_cold int bitpacked_init_decoder(AVCodecContext *avctx)
Definition: bitpacked_dec.c:102
get_bits.h
AV_CODEC_CAP_FRAME_THREADS
#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: codec.h:113
bitpacked_decode_yuv422p10
static int bitpacked_decode_yuv422p10(AVCodecContext *avctx, AVFrame *frame, const AVPacket *avpkt)
Definition: bitpacked_dec.c:63
AVPacket::buf
AVBufferRef * buf
A reference to the reference-counted buffer where the packet data is stored.
Definition: packet.h:357
ff_bitpacked_decoder
const FFCodec ff_bitpacked_decoder
Definition: bitpacked_dec.c:144
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:409
BitpackedContext
Definition: bitpacked_dec.c:35
AVPacket::size
int size
Definition: packet.h:375
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
codec_internal.h
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:1450
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:211
AVCodecContext::height
int height
Definition: avcodec.h:571
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:608
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:41
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:398
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:36
AVCodecContext::codec_tag
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:423
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:425
AVPacket
This structure stores compressed data.
Definition: packet.h:351
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:571
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:155