FFmpeg
libcodec2.c
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1 /*
2  * codec2 encoder/decoder using libcodec2
3  * Copyright (c) 2017 Tomas Härdin
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 #include <codec2/codec2.h>
24 #include "avcodec.h"
25 #include "libavutil/opt.h"
26 #include "encode.h"
27 #include "internal.h"
28 #include "codec2utils.h"
29 
30 typedef struct {
31  const AVClass *class;
32  struct CODEC2 *codec;
33  int mode;
35 
36 static const AVOption options[] = {
37  //not AV_OPT_FLAG_DECODING_PARAM since mode should come from the demuxer
38  //1300 (aka FreeDV 1600) is the most common mode on-the-air, default to it here as well
39  CODEC2_AVOPTIONS("codec2 mode", LibCodec2Context, 0, 4 /*CODEC2_MODE_1300*/, AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_ENCODING_PARAM),
40  { NULL },
41 };
42 
43 static const AVClass libcodec2_enc_class = {
44  .class_name = "libcodec2 encoder",
45  .item_name = av_default_item_name,
46  .option = options,
47  .version = LIBAVUTIL_VERSION_INT,
48 };
49 
51 {
52  LibCodec2Context *c2 = avctx->priv_data;
53  //Grab mode name from options, unless it's some weird number.
54  const char *modename = mode >= 0 && mode <= CODEC2_MODE_MAX ? options[mode+1].name : "?";
55 
56  c2->codec = codec2_create(mode);
57  if (!c2->codec) {
58  //Out of memory or unsupported mode. The latter seems most likely,
59  //but we can't tell for sure with the current API.
60  goto libcodec2_init_common_error;
61  }
62 
63  avctx->frame_size = codec2_samples_per_frame(c2->codec);
64  avctx->block_align = (codec2_bits_per_frame(c2->codec) + 7) / 8;
65 
66  if (avctx->frame_size <= 0 || avctx->block_align <= 0) {
67  //codec2_create() may succeed for some modes but still fail at codec2_samples_per_frame()
68  //example is -mode 700C on libcodec2 0.4
69  codec2_destroy(c2->codec);
70  c2->codec = NULL;
71  goto libcodec2_init_common_error;
72  }
73 
74  codec2_set_natural_or_gray(c2->codec, 1);
75 
76  return 0;
77 
78 libcodec2_init_common_error:
79  av_log(avctx, AV_LOG_ERROR,
80  "Mode %i (%s) not supported with the linked version of libcodec2\n",
81  mode, modename);
82  return AVERROR(EINVAL);
83 }
84 
86 {
87  avctx->sample_rate = 8000;
88  avctx->channels = 1;
91 
92  if (avctx->extradata_size != CODEC2_EXTRADATA_SIZE) {
93  av_log(avctx, AV_LOG_ERROR, "must have exactly %i bytes of extradata (got %i)\n",
95  return AVERROR_INVALIDDATA;
96  }
97 
99 }
100 
102 {
103  LibCodec2Context *c2 = avctx->priv_data;
104 
105  //will need to be smarter once we get wideband support
106  if (avctx->sample_rate != 8000 ||
107  avctx->channels != 1 ||
108  avctx->sample_fmt != AV_SAMPLE_FMT_S16) {
109  av_log(avctx, AV_LOG_ERROR, "only 8 kHz 16-bit mono allowed\n");
110  return AVERROR(EINVAL);
111  }
112 
114  if (!avctx->extradata) {
115  return AVERROR(ENOMEM);
116  }
117 
119  codec2_make_extradata(avctx->extradata, c2->mode);
120 
121  return libcodec2_init_common(avctx, c2->mode);
122 }
123 
125 {
126  LibCodec2Context *c2 = avctx->priv_data;
127 
128  codec2_destroy(c2->codec);
129  return 0;
130 }
131 
132 static int libcodec2_decode(AVCodecContext *avctx, void *data,
133  int *got_frame_ptr, AVPacket *pkt)
134 {
135  LibCodec2Context *c2 = avctx->priv_data;
136  AVFrame *frame = data;
137  int ret, nframes, i;
138  uint8_t *input;
139  int16_t *output;
140 
141  nframes = pkt->size / avctx->block_align;
142  frame->nb_samples = avctx->frame_size * nframes;
143 
144  ret = ff_get_buffer(avctx, frame, 0);
145  if (ret < 0) {
146  return ret;
147  }
148 
149  input = pkt->data;
150  output = (int16_t *)frame->data[0];
151 
152  for (i = 0; i < nframes; i++) {
153  codec2_decode(c2->codec, output, input);
154  input += avctx->block_align;
155  output += avctx->frame_size;
156  }
157 
158  *got_frame_ptr = nframes > 0;
159  return nframes * avctx->block_align;
160 }
161 
162 static int libcodec2_encode(AVCodecContext *avctx, AVPacket *avpkt,
163  const AVFrame *frame, int *got_packet_ptr)
164 {
165  LibCodec2Context *c2 = avctx->priv_data;
166  int16_t *samples = (int16_t *)frame->data[0];
167 
168  int ret = ff_get_encode_buffer(avctx, avpkt, avctx->block_align, 0);
169  if (ret < 0) {
170  return ret;
171  }
172 
173  codec2_encode(c2->codec, avpkt->data, samples);
174  *got_packet_ptr = 1;
175 
176  return 0;
177 }
178 
180  .name = "libcodec2",
181  .long_name = NULL_IF_CONFIG_SMALL("codec2 decoder using libcodec2"),
182  .type = AVMEDIA_TYPE_AUDIO,
183  .id = AV_CODEC_ID_CODEC2,
184  .priv_data_size = sizeof(LibCodec2Context),
186  .close = libcodec2_close,
188  .capabilities = AV_CODEC_CAP_CHANNEL_CONF,
189  .supported_samplerates = (const int[]){ 8000, 0 },
190  .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_NONE },
191  .channel_layouts = (const uint64_t[]) { AV_CH_LAYOUT_MONO, 0 },
192 };
193 
195  .name = "libcodec2",
196  .long_name = NULL_IF_CONFIG_SMALL("codec2 encoder using libcodec2"),
197  .type = AVMEDIA_TYPE_AUDIO,
198  .id = AV_CODEC_ID_CODEC2,
199  .capabilities = AV_CODEC_CAP_DR1,
200  .priv_data_size = sizeof(LibCodec2Context),
202  .close = libcodec2_close,
203  .encode2 = libcodec2_encode,
204  .supported_samplerates = (const int[]){ 8000, 0 },
205  .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_NONE },
206  .channel_layouts = (const uint64_t[]) { AV_CH_LAYOUT_MONO, 0 },
207  .priv_class = &libcodec2_enc_class,
208 };
CODEC2_EXTRADATA_SIZE
#define CODEC2_EXTRADATA_SIZE
Definition: codec2utils.h:48
AVCodecContext::frame_size
int frame_size
Number of samples per channel in an audio frame.
Definition: avcodec.h:1012
AVCodec
AVCodec.
Definition: codec.h:202
libcodec2_encode
static int libcodec2_encode(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)
Definition: libcodec2.c:162
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
opt.h
AVCodecContext::channel_layout
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:1043
AVCodecContext::sample_rate
int sample_rate
samples per second
Definition: avcodec.h:992
AV_CH_LAYOUT_MONO
#define AV_CH_LAYOUT_MONO
Definition: channel_layout.h:90
output
filter_frame For filters that do not use the this method is called when a frame is pushed to the filter s input It can be called at any time except in a reentrant way If the input frame is enough to produce output
Definition: filter_design.txt:225
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
AVOption
AVOption.
Definition: opt.h:247
encode.h
data
const char data[16]
Definition: mxf.c:143
ff_libcodec2_decoder
const AVCodec ff_libcodec2_decoder
Definition: libcodec2.c:179
libcodec2_init_decoder
static av_cold int libcodec2_init_decoder(AVCodecContext *avctx)
Definition: libcodec2.c:85
options
static const AVOption options[]
Definition: libcodec2.c:36
pkt
AVPacket * pkt
Definition: movenc.c:59
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
LibCodec2Context::mode
int mode
Definition: libcodec2.c:33
ff_libcodec2_encoder
const AVCodec ff_libcodec2_encoder
Definition: libcodec2.c:194
codec2_make_extradata
static void codec2_make_extradata(uint8_t *ptr, int mode)
Definition: codec2utils.h:51
decode
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
AVCodecContext::extradata_size
int extradata_size
Definition: avcodec.h:485
AV_OPT_FLAG_ENCODING_PARAM
#define AV_OPT_FLAG_ENCODING_PARAM
a generic parameter which can be set by the user for muxing or encoding
Definition: opt.h:277
CODEC2_MODE_MAX
#define CODEC2_MODE_MAX
Definition: codec2utils.h:30
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
codec2utils.h
libcodec2_init_common
static av_cold int libcodec2_init_common(AVCodecContext *avctx, int mode)
Definition: libcodec2.c:50
AV_CODEC_ID_CODEC2
@ AV_CODEC_ID_CODEC2
Definition: codec_id.h:489
AV_OPT_FLAG_AUDIO_PARAM
#define AV_OPT_FLAG_AUDIO_PARAM
Definition: opt.h:279
LIBAVUTIL_VERSION_INT
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
NULL
#define NULL
Definition: coverity.c:32
av_default_item_name
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
libcodec2_close
static av_cold int libcodec2_close(AVCodecContext *avctx)
Definition: libcodec2.c:124
libcodec2_enc_class
static const AVClass libcodec2_enc_class
Definition: libcodec2.c:43
for
for(j=16;j >0;--j)
Definition: h264pred_template.c:469
AV_CODEC_CAP_CHANNEL_CONF
#define AV_CODEC_CAP_CHANNEL_CONF
Codec should fill in channel configuration and samplerate instead of container.
Definition: codec.h:109
ff_get_buffer
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1652
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
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
LibCodec2Context
Definition: libcodec2.c:30
AVCodecContext::sample_fmt
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:1000
AV_SAMPLE_FMT_NONE
@ AV_SAMPLE_FMT_NONE
Definition: samplefmt.h:59
AVOption::name
const char * name
Definition: opt.h:248
codec2_mode_from_extradata
static uint8_t codec2_mode_from_extradata(uint8_t *ptr)
Definition: codec2utils.h:59
input
and forward the test the status of outputs and forward it to the corresponding return FFERROR_NOT_READY If the filters stores internally one or a few frame for some input
Definition: filter_design.txt:172
AVCodecContext::channels
int channels
number of audio channels
Definition: avcodec.h:993
LibCodec2Context::codec
struct CODEC2 * codec
Definition: libcodec2.c:32
i
int i
Definition: input.c:406
AVCodecContext::extradata
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:484
CODEC2_AVOPTIONS
#define CODEC2_AVOPTIONS(desc, classname, min_val, default_val, option_flags)
Definition: codec2utils.h:36
AVSampleFormat
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:58
AV_SAMPLE_FMT_S16
@ AV_SAMPLE_FMT_S16
signed 16 bits
Definition: samplefmt.h:61
av_mallocz
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:263
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:209
avcodec.h
libcodec2_decode
static int libcodec2_decode(AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *pkt)
Definition: libcodec2.c:132
ret
ret
Definition: filter_design.txt:187
AVCodecContext::block_align
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs.
Definition: avcodec.h:1029
AVClass::class_name
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:71
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_INPUT_BUFFER_PADDING_SIZE
#define AV_INPUT_BUFFER_PADDING_SIZE
Definition: defs.h:40
libcodec2_init_encoder
static av_cold int libcodec2_init_encoder(AVCodecContext *avctx)
Definition: libcodec2.c:101
AVCodecContext
main external API structure.
Definition: avcodec.h:383
c2
static const uint64_t c2
Definition: murmur3.c:52
channel_layout.h
ff_get_encode_buffer
int ff_get_encode_buffer(AVCodecContext *avctx, AVPacket *avpkt, int64_t size, int flags)
Get a buffer for a packet.
Definition: encode.c:78
mode
mode
Definition: ebur128.h:83
samples
Filter the word “frame” indicates either a video frame or a group of audio samples
Definition: filter_design.txt:8
AVPacket
This structure stores compressed data.
Definition: packet.h:350
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:410
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61