FFmpeg
libilbc.c
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1 /*
2  * iLBC decoder/encoder stub
3  * Copyright (c) 2012 Martin Storsjo
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 <ilbc.h>
23 
25 #include "libavutil/common.h"
26 #include "libavutil/opt.h"
27 #include "avcodec.h"
28 #include "internal.h"
29 
30 static int get_mode(AVCodecContext *avctx)
31 {
32  if (avctx->block_align == 38)
33  return 20;
34  else if (avctx->block_align == 50)
35  return 30;
36  else if (avctx->bit_rate > 0)
37  return avctx->bit_rate <= 14000 ? 30 : 20;
38  else
39  return -1;
40 }
41 
42 typedef struct ILBCDecContext {
43  const AVClass *class;
44  iLBC_Dec_Inst_t decoder;
45  int enhance;
47 
48 static const AVOption ilbc_dec_options[] = {
49  { "enhance", "Enhance the decoded audio (adds delay)", offsetof(ILBCDecContext, enhance), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_DECODING_PARAM },
50  { NULL }
51 };
52 
53 static const AVClass ilbc_dec_class = {
54  .class_name = "libilbc",
55  .item_name = av_default_item_name,
56  .option = ilbc_dec_options,
57  .version = LIBAVUTIL_VERSION_INT,
58 };
59 
61 {
62  ILBCDecContext *s = avctx->priv_data;
63  int mode;
64 
65  if ((mode = get_mode(avctx)) < 0) {
66  av_log(avctx, AV_LOG_ERROR, "iLBC frame mode not indicated\n");
67  return AVERROR(EINVAL);
68  }
69 
70  WebRtcIlbcfix_InitDecode(&s->decoder, mode, s->enhance);
71 
72  avctx->channels = 1;
74  avctx->sample_rate = 8000;
76 
77  return 0;
78 }
79 
80 static int ilbc_decode_frame(AVCodecContext *avctx, void *data,
81  int *got_frame_ptr, AVPacket *avpkt)
82 {
83  const uint8_t *buf = avpkt->data;
84  int buf_size = avpkt->size;
85  ILBCDecContext *s = avctx->priv_data;
86  AVFrame *frame = data;
87  int ret;
88 
89  if (s->decoder.no_of_bytes > buf_size) {
90  av_log(avctx, AV_LOG_ERROR, "iLBC frame too short (%u, should be %u)\n",
91  buf_size, s->decoder.no_of_bytes);
92  return AVERROR_INVALIDDATA;
93  }
94 
95  frame->nb_samples = s->decoder.blockl;
96  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
97  return ret;
98 
99  WebRtcIlbcfix_DecodeImpl((int16_t *) frame->data[0], (const uint16_t *) buf, &s->decoder, 1);
100 
101  *got_frame_ptr = 1;
102 
103  return s->decoder.no_of_bytes;
104 }
105 
107  .name = "libilbc",
108  .long_name = NULL_IF_CONFIG_SMALL("iLBC (Internet Low Bitrate Codec)"),
109  .type = AVMEDIA_TYPE_AUDIO,
110  .id = AV_CODEC_ID_ILBC,
111  .priv_data_size = sizeof(ILBCDecContext),
114  .capabilities = AV_CODEC_CAP_DR1,
115  .priv_class = &ilbc_dec_class,
116 };
117 
118 typedef struct ILBCEncContext {
119  const AVClass *class;
120  iLBC_Enc_Inst_t encoder;
121  int mode;
123 
124 static const AVOption ilbc_enc_options[] = {
125  { "mode", "iLBC mode (20 or 30 ms frames)", offsetof(ILBCEncContext, mode), AV_OPT_TYPE_INT, { .i64 = 20 }, 20, 30, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM },
126  { NULL }
127 };
128 
129 static const AVClass ilbc_enc_class = {
130  .class_name = "libilbc",
131  .item_name = av_default_item_name,
132  .option = ilbc_enc_options,
133  .version = LIBAVUTIL_VERSION_INT,
134 };
135 
137 {
138  ILBCEncContext *s = avctx->priv_data;
139  int mode;
140 
141  if (avctx->sample_rate != 8000) {
142  av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n");
143  return AVERROR(EINVAL);
144  }
145 
146  if (avctx->channels != 1) {
147  av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
148  return AVERROR(EINVAL);
149  }
150 
151  if ((mode = get_mode(avctx)) > 0)
152  s->mode = mode;
153  else
154  s->mode = s->mode != 30 ? 20 : 30;
155  WebRtcIlbcfix_InitEncode(&s->encoder, s->mode);
156 
157  avctx->block_align = s->encoder.no_of_bytes;
158  avctx->frame_size = s->encoder.blockl;
159 
160  return 0;
161 }
162 
163 static int ilbc_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
164  const AVFrame *frame, int *got_packet_ptr)
165 {
166  ILBCEncContext *s = avctx->priv_data;
167  int ret;
168 
169  if ((ret = ff_alloc_packet2(avctx, avpkt, 50, 0)) < 0)
170  return ret;
171 
172  WebRtcIlbcfix_EncodeImpl((uint16_t *) avpkt->data, (const int16_t *) frame->data[0], &s->encoder);
173 
174  avpkt->size = s->encoder.no_of_bytes;
175  *got_packet_ptr = 1;
176  return 0;
177 }
178 
180  { "b", "0" },
181  { NULL }
182 };
183 
185  .name = "libilbc",
186  .long_name = NULL_IF_CONFIG_SMALL("iLBC (Internet Low Bitrate Codec)"),
187  .type = AVMEDIA_TYPE_AUDIO,
188  .id = AV_CODEC_ID_ILBC,
189  .priv_data_size = sizeof(ILBCEncContext),
191  .encode2 = ilbc_encode_frame,
192  .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
194  .defaults = ilbc_encode_defaults,
195  .priv_class = &ilbc_enc_class,
196  .wrapper_name = "libbilbc",
197 };
#define NULL
Definition: coverity.c:32
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
This structure describes decoded (raw) audio or video data.
Definition: frame.h:295
AVOption.
Definition: opt.h:246
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:100
static int ilbc_decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
Definition: libilbc.c:80
int64_t bit_rate
the average bitrate
Definition: avcodec.h:1615
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
static av_cold int ilbc_decode_init(AVCodecContext *avctx)
Definition: libilbc.c:60
#define AV_OPT_FLAG_AUDIO_PARAM
Definition: opt.h:278
int size
Definition: avcodec.h:1478
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:191
static int get_mode(AVCodecContext *avctx)
Definition: libilbc.c:30
AVCodec.
Definition: avcodec.h:3481
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs...
Definition: avcodec.h:2262
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:42
static const AVClass ilbc_dec_class
Definition: libilbc.c:53
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:72
int ff_alloc_packet2(AVCodecContext *avctx, AVPacket *avpkt, int64_t size, int64_t min_size)
Check AVPacket size and/or allocate data.
Definition: encode.c:32
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:2233
uint8_t
AVCodec ff_libilbc_decoder
Definition: libilbc.c:106
#define av_cold
Definition: attributes.h:82
AVOptions.
uint8_t * data
Definition: avcodec.h:1477
static av_cold int ilbc_encode_init(AVCodecContext *avctx)
Definition: libilbc.c:136
static const AVCodecDefault ilbc_encode_defaults[]
Definition: libilbc.c:179
#define av_log(a,...)
#define AV_OPT_FLAG_ENCODING_PARAM
a generic parameter which can be set by the user for muxing or encoding
Definition: opt.h:276
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
const char * name
Name of the codec implementation.
Definition: avcodec.h:3488
iLBC_Enc_Inst_t encoder
Definition: libilbc.c:120
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:2276
static const AVClass ilbc_enc_class
Definition: libilbc.c:129
audio channel layout utility functions
AVCodec ff_libilbc_encoder
Definition: libilbc.c:184
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
#define s(width, name)
Definition: cbs_vp9.c:257
int frame_size
Number of samples per channel in an audio frame.
Definition: avcodec.h:2245
iLBC_Dec_Inst_t decoder
Definition: libilbc.c:44
static int ilbc_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)
Definition: libilbc.c:163
Libavcodec external API header.
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:58
int sample_rate
samples per second
Definition: avcodec.h:2225
main external API structure.
Definition: avcodec.h:1565
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1963
void * buf
Definition: avisynth_c.h:766
Describe the class of an AVClass context structure.
Definition: log.h:67
#define AV_OPT_FLAG_DECODING_PARAM
a generic parameter which can be set by the user for demuxing or decoding
Definition: opt.h:277
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:309
common internal api header.
common internal and external API header
signed 16 bits
Definition: samplefmt.h:61
void * priv_data
Definition: avcodec.h:1592
int channels
number of audio channels
Definition: avcodec.h:2226
static const AVOption ilbc_enc_options[]
Definition: libilbc.c:124
static enum AVSampleFormat sample_fmts[]
Definition: adpcmenc.c:701
static const AVOption ilbc_dec_options[]
Definition: libilbc.c:48
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
#define AV_CH_LAYOUT_MONO
This structure stores compressed data.
Definition: avcodec.h:1454
mode
Use these values in ebur128_init (or&#39;ed).
Definition: ebur128.h:83
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:361
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:981