FFmpeg: libavcodec/imm5.c Source File

FFmpeg
imm5.c
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1 /*
2  * Copyright (c) 2019 Paul B Mahol
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include "libavutil/intreadwrite.h"
22 
23 #include "avcodec.h"
24 #include "codec_internal.h"
25 
26  typedef struct IMM5Context {
27   AVCodecContext *h264_avctx; // wrapper context for H264
28   AVCodecContext *hevc_avctx; // wrapper context for HEVC
29 } IMM5Context;
30 
31  static const struct IMM5_unit {
32   uint8_t bits[14];
33   uint8_t len;
34 } IMM5_units[14] = {
35  { { 0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0x80, 0x1E, 0xF4, 0x0B, 0x0F, 0x88 }, 12 },
36  { { 0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0x80, 0x1E, 0xF4, 0x05, 0x83, 0xE2 }, 12 },
37  { { 0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0x80, 0x1E, 0xF4, 0x05, 0x81, 0xE8, 0x80 }, 13 },
38  { { 0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0x80, 0x1E, 0xF4, 0x0B, 0x04, 0xA2 }, 12 },
39  { { 0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0x80, 0x1E, 0xF4, 0x05, 0x81, 0x28, 0x80 }, 13 },
40  { { 0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0x80, 0x1E, 0xF4, 0x05, 0x80, 0x92, 0x20 }, 13 },
41  { { 0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0x00, 0x1E, 0x9A, 0x74, 0x0B, 0x0F, 0xC8 }, 13 },
42  { { 0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0x00, 0x1E, 0x9A, 0x74, 0x05, 0x83, 0xF2 }, 13 },
43  { { 0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0x00, 0x1E, 0x9A, 0x74, 0x05, 0x81, 0xEC, 0x80 }, 14 },
44  { { 0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0x00, 0x1E, 0x9A, 0x74, 0x0B, 0x04, 0xB2 }, 13 },
45  { { 0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0x00, 0x1E, 0x9A, 0x74, 0x05, 0x81, 0x2C, 0x80 }, 14 },
46  { { 0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0x00, 0x1E, 0x9A, 0x74, 0x05, 0x80, 0x93, 0x20 }, 14 },
47  { { 0x00, 0x00, 0x00, 0x01, 0x68, 0xDE, 0x3C, 0x80 }, 8 },
48  { { 0x00, 0x00, 0x00, 0x01, 0x68, 0xCE, 0x32, 0x28 }, 8 },
49 };
50 
51  static av_cold int imm5_init(AVCodecContext *avctx)
52 {
53  IMM5Context *ctx = avctx->priv_data;
54  const AVCodec *codec;
55  int ret;
56 
57  codec = avcodec_find_decoder(AV_CODEC_ID_H264);
58  if (!codec)
59  return AVERROR_BUG;
60  ctx->h264_avctx = avcodec_alloc_context3(codec);
61  if (!ctx->h264_avctx)
62  return AVERROR(ENOMEM);
63  ctx->h264_avctx->thread_count = 1;
64  ctx->h264_avctx->flags = avctx->flags;
65  ctx->h264_avctx->flags2 = avctx->flags2;
66  ret = avcodec_open2(ctx->h264_avctx, codec, NULL);
67  if (ret < 0)
68  return ret;
69 
70  codec = avcodec_find_decoder(AV_CODEC_ID_HEVC);
71  if (!codec)
72  return AVERROR_BUG;
73  ctx->hevc_avctx = avcodec_alloc_context3(codec);
74  if (!ctx->hevc_avctx)
75  return AVERROR(ENOMEM);
76  ctx->hevc_avctx->thread_count = 1;
77  ctx->hevc_avctx->flags = avctx->flags;
78  ctx->hevc_avctx->flags2 = avctx->flags2;
79  ret = avcodec_open2(ctx->hevc_avctx, codec, NULL);
80  if (ret < 0)
81  return ret;
82 
83  return 0;
84 }
85 
86  static int imm5_decode_frame(AVCodecContext *avctx, AVFrame *frame,
87  int *got_frame, AVPacket *avpkt)
88 {
89  IMM5Context *ctx = avctx->priv_data;
90  AVCodecContext *codec_avctx = ctx->h264_avctx;
91  int ret;
92 
93  if (avpkt->size > 24 && avpkt->data[8] <= 1 && AV_RL32(avpkt->data + 4) + 24ULL <= avpkt->size) {
94  int codec_type = avpkt->data[1];
95  int index = avpkt->data[10];
96  int new_size = AV_RL32(avpkt->data + 4);
97  int offset, off;
98 
99  if (codec_type == 0xA) {
100  codec_avctx = ctx->hevc_avctx;
101  } else if (index == 17) {
102  index = 4;
103  } else if (index == 18) {
104  index = 5;
105  }
106 
107  if (index >= 1 && index <= 12) {
108  ret = av_packet_make_writable(avpkt);
109  if (ret < 0)
110  return ret;
111 
112  index -= 1;
113  off = offset = IMM5_units[index].len;
114  if (codec_type == 2) {
115  offset += IMM5_units[12].len;
116  } else {
117  offset += IMM5_units[13].len;
118  }
119 
120  avpkt->data += 24 - offset;
121  avpkt->size = new_size + offset;
122 
123  memcpy(avpkt->data, IMM5_units[index].bits, IMM5_units[index].len);
124  if (codec_type == 2) {
125  memcpy(avpkt->data + off, IMM5_units[12].bits, IMM5_units[12].len);
126  } else {
127  memcpy(avpkt->data + off, IMM5_units[13].bits, IMM5_units[13].len);
128  }
129  } else {
130  avpkt->data += 24;
131  avpkt->size -= 24;
132  }
133  }
134 
135  ret = avcodec_send_packet(codec_avctx, avpkt);
136  if (ret < 0) {
137  av_log(avctx, AV_LOG_ERROR, "Error submitting a packet for decoding\n");
138  return ret;
139  }
140 
141  ret = avcodec_receive_frame(codec_avctx, frame);
142  if (ret < 0)
143  return ret;
144 
145  avctx->pix_fmt = codec_avctx->pix_fmt;
146  avctx->coded_width = codec_avctx->coded_width;
147  avctx->coded_height = codec_avctx->coded_height;
148  avctx->width = codec_avctx->width;
149  avctx->height = codec_avctx->height;
150  avctx->bit_rate = codec_avctx->bit_rate;
151  avctx->colorspace = codec_avctx->colorspace;
152  avctx->color_range = codec_avctx->color_range;
153  avctx->color_trc = codec_avctx->color_trc;
154  avctx->color_primaries = codec_avctx->color_primaries;
155  avctx->chroma_sample_location = codec_avctx->chroma_sample_location;
156 
157  *got_frame = 1;
158 
159  return avpkt->size;
160 }
161 
162  static void imm5_flush(AVCodecContext *avctx)
163 {
164  IMM5Context *ctx = avctx->priv_data;
165 
166  avcodec_flush_buffers(ctx->h264_avctx);
167  avcodec_flush_buffers(ctx->hevc_avctx);
168 }
169 
170  static av_cold int imm5_close(AVCodecContext *avctx)
171 {
172  IMM5Context *ctx = avctx->priv_data;
173 
174  avcodec_free_context(&ctx->h264_avctx);
175  avcodec_free_context(&ctx->hevc_avctx);
176 
177  return 0;
178 }
179 
180  const FFCodec ff_imm5_decoder = {
181  .p.name = "imm5",
182  CODEC_LONG_NAME("Infinity IMM5"),
183  .p.type = AVMEDIA_TYPE_VIDEO,
184  .p.id = AV_CODEC_ID_IMM5,
185  .init = imm5_init,
186  FF_CODEC_DECODE_CB(imm5_decode_frame),
187  .close = imm5_close,
188  .flush = imm5_flush,
189  .priv_data_size = sizeof(IMM5Context),
190  .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
191 };
AVCodec
AVCodec.
Definition: codec.h:187
IMM5_unit
Definition: imm5.c:31
FF_CODEC_CAP_INIT_CLEANUP
#define FF_CODEC_CAP_INIT_CLEANUP
The codec allows calling the close function for deallocation even if the init function returned a fai...
Definition: codec_internal.h:42
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
imm5_flush
static void imm5_flush(AVCodecContext *avctx)
Definition: imm5.c:162
AVCodecContext::colorspace
enum AVColorSpace colorspace
YUV colorspace type.
Definition: avcodec.h:685
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:344
AVCodecContext::color_trc
enum AVColorTransferCharacteristic color_trc
Color Transfer Characteristic.
Definition: avcodec.h:678
AVPacket::data
uint8_t * data
Definition: packet.h:522
FFCodec
Definition: codec_internal.h:127
imm5_decode_frame
static int imm5_decode_frame(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *avpkt)
Definition: imm5.c:86
codec_type
enum AVMediaType codec_type
Definition: rtp.c:37
AV_CODEC_ID_IMM5
@ AV_CODEC_ID_IMM5
Definition: codec_id.h:297
FFCodec::p
AVCodec p
The public AVCodec.
Definition: codec_internal.h:131
AVCodecContext::flags
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:502
AVCodecContext::coded_height
int coded_height
Definition: avcodec.h:633
AVCodecContext::color_primaries
enum AVColorPrimaries color_primaries
Chromaticity coordinates of the source primaries.
Definition: avcodec.h:671
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
av_cold
#define av_cold
Definition: attributes.h:90
avcodec_alloc_context3
AVCodecContext * avcodec_alloc_context3(const AVCodec *codec)
Allocate an AVCodecContext and set its fields to default values.
Definition: options.c:149
FF_CODEC_DECODE_CB
#define FF_CODEC_DECODE_CB(func)
Definition: codec_internal.h:287
intreadwrite.h
AVFormatContext::flags
int flags
Flags modifying the (de)muxer behaviour.
Definition: avformat.h:1406
avcodec_receive_frame
int attribute_align_arg avcodec_receive_frame(AVCodecContext *avctx, AVFrame *frame)
Return decoded output data from a decoder or encoder (when the AV_CODEC_FLAG_RECON_FRAME flag is used...
Definition: avcodec.c:681
ctx
AVFormatContext * ctx
Definition: movenc.c:48
IMM5_units
static const struct IMM5_unit IMM5_units[14]
AV_CODEC_ID_H264
@ AV_CODEC_ID_H264
Definition: codec_id.h:79
CODEC_LONG_NAME
#define CODEC_LONG_NAME(str)
Definition: codec_internal.h:272
frame
static AVFrame * frame
Definition: demux_decode.c:54
NULL
#define NULL
Definition: coverity.c:32
AVCodecContext::color_range
enum AVColorRange color_range
MPEG vs JPEG YUV range.
Definition: avcodec.h:695
IMM5Context
Definition: imm5.c:26
avcodec_free_context
void avcodec_free_context(AVCodecContext **avctx)
Free the codec context and everything associated with it and write NULL to the provided pointer.
Definition: options.c:164
AVCodecContext::bit_rate
int64_t bit_rate
the average bitrate
Definition: avcodec.h:495
avcodec_open2
int attribute_align_arg avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)
Initialize the AVCodecContext to use the given AVCodec.
Definition: avcodec.c:128
index
int index
Definition: gxfenc.c:89
avcodec_find_decoder
const AVCodec * avcodec_find_decoder(enum AVCodecID id)
Find a registered decoder with a matching codec ID.
Definition: allcodecs.c:971
IMM5_unit::len
uint8_t len
Definition: imm5.c:33
AVCodecContext::flags2
int flags2
AV_CODEC_FLAG2_*.
Definition: avcodec.h:509
IMM5Context::hevc_avctx
AVCodecContext * hevc_avctx
Definition: imm5.c:28
AVPacket::size
int size
Definition: packet.h:523
codec_internal.h
IMM5_unit::bits
uint8_t bits[14]
Definition: imm5.c:32
IMM5Context::h264_avctx
AVCodecContext * h264_avctx
Definition: imm5.c:27
size
int size
Definition: twinvq_data.h:10344
ff_imm5_decoder
const FFCodec ff_imm5_decoder
Definition: imm5.c:180
offset
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
Definition: writing_filters.txt:86
imm5_close
static av_cold int imm5_close(AVCodecContext *avctx)
Definition: imm5.c:170
avcodec_send_packet
int avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt)
Supply raw packet data as input to a decoder.
Definition: decode.c:675
AV_CODEC_ID_HEVC
@ AV_CODEC_ID_HEVC
Definition: codec_id.h:226
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:194
AVCodecContext::chroma_sample_location
enum AVChromaLocation chroma_sample_location
This defines the location of chroma samples.
Definition: avcodec.h:702
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
avcodec_flush_buffers
void avcodec_flush_buffers(AVCodecContext *avctx)
Reset the internal codec state / flush internal buffers.
Definition: avcodec.c:350
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:92
AVCodecContext
main external API structure.
Definition: avcodec.h:445
av_packet_make_writable
int av_packet_make_writable(AVPacket *pkt)
Create a writable reference for the data described by a given packet, avoiding data copy if possible.
Definition: avpacket.c:509
AVCodecContext::coded_width
int coded_width
Bitstream width / height, may be different from width/height e.g.
Definition: avcodec.h:633
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
AVPacket
This structure stores compressed data.
Definition: packet.h:499
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:472
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:618
imm5_init
static av_cold int imm5_init(AVCodecContext *avctx)
Definition: imm5.c:51
AVERROR_BUG
#define AVERROR_BUG
Internal bug, also see AVERROR_BUG2.
Definition: error.h:52
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
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