Libav
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 Libav.
6  *
7  * Libav 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  * Libav 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 Libav; 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 = {
55 };
56 
58 {
59  ILBCDecContext *s = avctx->priv_data;
60  int mode;
61 
62  if ((mode = get_mode(avctx)) < 0) {
63  av_log(avctx, AV_LOG_ERROR, "iLBC frame mode not indicated\n");
64  return AVERROR(EINVAL);
65  }
66 
67  WebRtcIlbcfix_InitDecode(&s->decoder, mode, s->enhance);
68 
69  avctx->channels = 1;
71  avctx->sample_rate = 8000;
73 
74  return 0;
75 }
76 
77 static int ilbc_decode_frame(AVCodecContext *avctx, void *data,
78  int *got_frame_ptr, AVPacket *avpkt)
79 {
80  const uint8_t *buf = avpkt->data;
81  int buf_size = avpkt->size;
82  ILBCDecContext *s = avctx->priv_data;
83  AVFrame *frame = data;
84  int ret;
85 
86  if (s->decoder.no_of_bytes > buf_size) {
87  av_log(avctx, AV_LOG_ERROR, "iLBC frame too short (%u, should be %u)\n",
88  buf_size, s->decoder.no_of_bytes);
89  return AVERROR_INVALIDDATA;
90  }
91 
92  frame->nb_samples = s->decoder.blockl;
93  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
94  av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
95  return ret;
96  }
97 
98  WebRtcIlbcfix_DecodeImpl((WebRtc_Word16*) frame->data[0],
99  (const WebRtc_UWord16*) 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 = 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 = {
131 };
132 
134 {
135  ILBCEncContext *s = avctx->priv_data;
136  int mode;
137 
138  if (avctx->sample_rate != 8000) {
139  av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n");
140  return AVERROR(EINVAL);
141  }
142 
143  if (avctx->channels != 1) {
144  av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
145  return AVERROR(EINVAL);
146  }
147 
148  if ((mode = get_mode(avctx)) > 0)
149  s->mode = mode;
150  else
151  s->mode = s->mode != 30 ? 20 : 30;
152  WebRtcIlbcfix_InitEncode(&s->encoder, s->mode);
153 
154  avctx->block_align = s->encoder.no_of_bytes;
155  avctx->frame_size = s->encoder.blockl;
156 
157  return 0;
158 }
159 
160 static int ilbc_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
161  const AVFrame *frame, int *got_packet_ptr)
162 {
163  ILBCEncContext *s = avctx->priv_data;
164  int ret;
165 
166  if ((ret = ff_alloc_packet(avpkt, 50))) {
167  av_log(avctx, AV_LOG_ERROR, "Error getting output packet\n");
168  return ret;
169  }
170 
171  WebRtcIlbcfix_EncodeImpl((WebRtc_UWord16*) avpkt->data, (const WebRtc_Word16*) frame->data[0], &s->encoder);
172 
173  avpkt->size = s->encoder.no_of_bytes;
174  *got_packet_ptr = 1;
175  return 0;
176 }
177 
179  { "b", "0" },
180  { NULL }
181 };
182 
184  .name = "libilbc",
185  .long_name = NULL_IF_CONFIG_SMALL("iLBC (Internet Low Bitrate Codec)"),
186  .type = AVMEDIA_TYPE_AUDIO,
187  .id = AV_CODEC_ID_ILBC,
188  .priv_data_size = sizeof(ILBCEncContext),
190  .encode2 = ilbc_encode_frame,
191  .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
193  .defaults = ilbc_encode_defaults,
194  .priv_class = &ilbc_enc_class,
195 };
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:54
This structure describes decoded (raw) audio or video data.
Definition: frame.h:135
AVOption.
Definition: opt.h:234
static int ilbc_decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
Definition: libilbc.c:77
static av_cold int ilbc_decode_init(AVCodecContext *avctx)
Definition: libilbc.c:57
#define AV_OPT_FLAG_AUDIO_PARAM
Definition: opt.h:269
int size
Definition: avcodec.h:968
static int get_mode(AVCodecContext *avctx)
Definition: libilbc.c:30
AVCodec.
Definition: avcodec.h:2790
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs...
Definition: avcodec.h:1822
static const AVClass ilbc_dec_class
Definition: libilbc.c:53
static int decode(MimicContext *ctx, int quality, int num_coeffs, int is_iframe)
Definition: mimic.c:275
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:1793
uint8_t
AVCodec ff_libilbc_decoder
Definition: libilbc.c:106
#define av_cold
Definition: attributes.h:66
AVOptions.
#define CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:684
const char data[16]
Definition: mxf.c:70
uint8_t * data
Definition: avcodec.h:967
static av_cold int ilbc_encode_init(AVCodecContext *avctx)
Definition: libilbc.c:133
static const AVCodecDefault ilbc_encode_defaults[]
Definition: libilbc.c:178
#define AV_OPT_FLAG_ENCODING_PARAM
a generic parameter which can be set by the user for muxing or encoding
Definition: opt.h:264
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:123
#define AVERROR(e)
Definition: error.h:43
sample_fmts
Definition: avconv_filter.c:68
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:150
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:168
const char * name
Name of the codec implementation.
Definition: avcodec.h:2797
iLBC_Enc_Inst_t encoder
Definition: libilbc.c:120
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:1846
static const AVClass ilbc_enc_class
Definition: libilbc.c:129
int bit_rate
the average bitrate
Definition: avcodec.h:1108
audio channel layout utility functions
AVCodec ff_libilbc_encoder
Definition: libilbc.c:183
int ff_alloc_packet(AVPacket *avpkt, int size)
Check AVPacket size and/or allocate data.
Definition: utils.c:1236
LIBAVUTIL_VERSION_INT
Definition: eval.c:55
int frame_size
Number of samples per channel in an audio frame.
Definition: avcodec.h:1805
iLBC_Dec_Inst_t decoder
Definition: libilbc.c:44
NULL
Definition: eval.c:55
static int ilbc_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)
Definition: libilbc.c:160
Libavcodec external API header.
AVSampleFormat
Audio Sample Formats.
Definition: samplefmt.h:61
AV_SAMPLE_FMT_NONE
Definition: avconv_filter.c:68
int sample_rate
samples per second
Definition: avcodec.h:1785
av_default_item_name
Definition: dnxhdenc.c:52
main external API structure.
Definition: avcodec.h:1044
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: utils.c:603
Describe the class of an AVClass context structure.
Definition: log.h:33
#define AV_OPT_FLAG_DECODING_PARAM
a generic parameter which can be set by the user for demuxing or decoding
Definition: opt.h:265
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:141
common internal api header.
common internal and external API header
signed 16 bits
Definition: samplefmt.h:64
static av_cold int init(AVCodecParserContext *s)
Definition: h264_parser.c:499
void * priv_data
Definition: avcodec.h:1086
int channels
number of audio channels
Definition: avcodec.h:1786
static const AVOption ilbc_enc_options[]
Definition: libilbc.c:124
static const AVOption ilbc_dec_options[]
Definition: libilbc.c:48
#define AV_CH_LAYOUT_MONO
This structure stores compressed data.
Definition: avcodec.h:944
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:179