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 "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 
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 
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, void *data,
87  int *got_frame, AVPacket *avpkt)
88 {
89  IMM5Context *ctx = avctx->priv_data;
90  AVFrame *frame = data;
91  AVCodecContext *codec_avctx = ctx->h264_avctx;
92  int ret;
93 
94  if (avpkt->size > 24 && avpkt->data[8] <= 1 && AV_RL32(avpkt->data + 4) + 24ULL <= avpkt->size) {
95  int codec_type = avpkt->data[1];
96  int index = avpkt->data[10];
97  int new_size = AV_RL32(avpkt->data + 4);
98  int offset, off;
99 
100  if (codec_type == 0xA) {
101  codec_avctx = ctx->hevc_avctx;
102  } else if (index == 17) {
103  index = 4;
104  } else if (index == 18) {
105  index = 5;
106  }
107 
108  if (index >= 1 && index <= 12) {
109  ret = av_packet_make_writable(avpkt);
110  if (ret < 0)
111  return ret;
112 
113  index -= 1;
114  off = offset = IMM5_units[index].len;
115  if (codec_type == 2) {
116  offset += IMM5_units[12].len;
117  } else {
118  offset += IMM5_units[13].len;
119  }
120 
121  avpkt->data += 24 - offset;
122  avpkt->size = new_size + offset;
123 
124  memcpy(avpkt->data, IMM5_units[index].bits, IMM5_units[index].len);
125  if (codec_type == 2) {
126  memcpy(avpkt->data + off, IMM5_units[12].bits, IMM5_units[12].len);
127  } else {
128  memcpy(avpkt->data + off, IMM5_units[13].bits, IMM5_units[13].len);
129  }
130  } else {
131  avpkt->data += 24;
132  avpkt->size -= 24;
133  }
134  }
135 
136  ret = avcodec_send_packet(codec_avctx, avpkt);
137  if (ret < 0) {
138  av_log(avctx, AV_LOG_ERROR, "Error submitting a packet for decoding\n");
139  return ret;
140  }
141 
142  ret = avcodec_receive_frame(codec_avctx, frame);
143  if (ret < 0)
144  return ret;
145 
146  avctx->pix_fmt = codec_avctx->pix_fmt;
147  avctx->coded_width = codec_avctx->coded_width;
148  avctx->coded_height = codec_avctx->coded_height;
149  avctx->width = codec_avctx->width;
150  avctx->height = codec_avctx->height;
151  avctx->bit_rate = codec_avctx->bit_rate;
152  avctx->colorspace = codec_avctx->colorspace;
153  avctx->color_range = codec_avctx->color_range;
154  avctx->color_trc = codec_avctx->color_trc;
155  avctx->color_primaries = codec_avctx->color_primaries;
156  avctx->chroma_sample_location = codec_avctx->chroma_sample_location;
157 
158  *got_frame = 1;
159 
160  return avpkt->size;
161 }
162 
163 static void imm5_flush(AVCodecContext *avctx)
164 {
165  IMM5Context *ctx = avctx->priv_data;
166 
167  avcodec_flush_buffers(ctx->h264_avctx);
168  avcodec_flush_buffers(ctx->hevc_avctx);
169 }
170 
172 {
173  IMM5Context *ctx = avctx->priv_data;
174 
175  avcodec_free_context(&ctx->h264_avctx);
176  avcodec_free_context(&ctx->hevc_avctx);
177 
178  return 0;
179 }
180 
182  .name = "imm5",
183  .long_name = NULL_IF_CONFIG_SMALL("Infinity IMM5"),
184  .type = AVMEDIA_TYPE_VIDEO,
185  .id = AV_CODEC_ID_IMM5,
186  .init = imm5_init,
187  .decode = imm5_decode_frame,
188  .close = imm5_close,
189  .flush = imm5_flush,
190  .priv_data_size = sizeof(IMM5Context),
191  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
193 };
AVCodec
AVCodec.
Definition: codec.h:197
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:41
IMM5_unit
Definition: imm5.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
imm5_flush
static void imm5_flush(AVCodecContext *avctx)
Definition: imm5.c:163
AVCodecContext::colorspace
enum AVColorSpace colorspace
YUV colorspace type.
Definition: avcodec.h:1066
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:303
index
fg index
Definition: ffmpeg_filter.c:168
AVCodecContext::color_trc
enum AVColorTransferCharacteristic color_trc
Color Transfer Characteristic.
Definition: avcodec.h:1059
internal.h
AVPacket::data
uint8_t * data
Definition: packet.h:365
data
const char data[16]
Definition: mxf.c:142
imm5_decode_frame
static int imm5_decode_frame(AVCodecContext *avctx, void *data, 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:295
AVCodecContext::flags
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:581
AVCodecContext::coded_height
int coded_height
Definition: avcodec.h:689
AVCodecContext::color_primaries
enum AVColorPrimaries color_primaries
Chromaticity coordinates of the source primaries.
Definition: avcodec.h:1052
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:181
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:141
intreadwrite.h
AVFormatContext::flags
int flags
Flags modifying the (de)muxer behaviour.
Definition: avformat.h:1224
avcodec_receive_frame
int avcodec_receive_frame(AVCodecContext *avctx, AVFrame *frame)
Return decoded output data from a decoder.
Definition: decode.c:628
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:76
NULL
#define NULL
Definition: coverity.c:32
AVCodecContext::color_range
enum AVColorRange color_range
MPEG vs JPEG YUV range.
Definition: avcodec.h:1073
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:156
AVCodecContext::bit_rate
int64_t bit_rate
the average bitrate
Definition: avcodec.h:551
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:135
avcodec_find_decoder
const AVCodec * avcodec_find_decoder(enum AVCodecID id)
Find a registered decoder with a matching codec ID.
Definition: allcodecs.c:910
IMM5_unit::len
uint8_t len
Definition: imm5.c:33
AVCodecContext::flags2
int flags2
AV_CODEC_FLAG2_*.
Definition: avcodec.h:588
IMM5Context::hevc_avctx
AVCodecContext * hevc_avctx
Definition: imm5.c:28
AVPacket::size
int size
Definition: packet.h:366
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
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
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:171
avcodec_send_packet
int avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt)
Supply raw packet data as input to a decoder.
Definition: decode.c:565
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: internal.h:49
AV_CODEC_ID_HEVC
@ AV_CODEC_ID_HEVC
Definition: codec_id.h:223
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:204
AVCodecContext::chroma_sample_location
enum AVChromaLocation chroma_sample_location
This defines the location of chroma samples.
Definition: avcodec.h:1080
AVCodecContext::height
int height
Definition: avcodec.h:674
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:711
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:387
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
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:92
AVCodecContext
main external API structure.
Definition: avcodec.h:501
ff_imm5_decoder
const AVCodec ff_imm5_decoder
Definition: imm5.c:181
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:484
AVCodecContext::coded_width
int coded_width
Bitstream width / height, may be different from width/height e.g.
Definition: avcodec.h:689
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
AVPacket
This structure stores compressed data.
Definition: packet.h:342
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:528
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:674
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:50
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28