FFmpeg: libavcodec/libilbc.c Source File
Go to the documentation of this file. 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
30
31 #ifndef LIBILBC_VERSION_MAJOR
32 #define LIBILBC_VERSION_MAJOR 2
33 #endif
34
36 {
38 return 20;
40 return 30;
42 return avctx->
bit_rate <= 14000 ? 30 : 20;
43 else
44 return -1;
45 }
46
49 #if LIBILBC_VERSION_MAJOR < 3
51 #else
53 #endif
56
60 };
61
67 };
68
70 {
73
77 }
78
79 WebRtcIlbcfix_InitDecode(&
s->decoder,
mode,
s->enhance);
80
85
86 return 0;
87 }
88
91 {
92 const uint8_t *buf = avpkt->
data;
93 int buf_size = avpkt->
size;
97
98 if (
s->decoder.no_of_bytes > buf_size) {
99 #if LIBILBC_VERSION_MAJOR < 3
101 #else
104 #endif
105 buf_size,
s->decoder.no_of_bytes);
107 }
108
109 frame->nb_samples =
s->decoder.blockl;
112
113 WebRtcIlbcfix_DecodeImpl((int16_t *)
frame->data[0], (
const uint16_t *) buf, &
s->decoder, 1);
114
115 *got_frame_ptr = 1;
116
117 return s->decoder.no_of_bytes;
118 }
119
130 };
131
134 #if LIBILBC_VERSION_MAJOR < 3
136 #else
138 #endif
141
145 };
146
152 };
153
155 {
158
162 }
163
167 }
168
171 else
172 s->mode =
s->mode != 30 ? 20 : 30;
173 WebRtcIlbcfix_InitEncode(&
s->encoder,
s->mode);
174
177
178 return 0;
179 }
180
183 {
186
189
190 WebRtcIlbcfix_EncodeImpl((uint16_t *) avpkt->
data, (
const int16_t *)
frame->data[0], &
s->encoder);
191
192 avpkt->
size =
s->encoder.no_of_bytes;
193 *got_packet_ptr = 1;
194 return 0;
195 }
196
198 { "b", "0" },
200 };
201
214 .wrapper_name = "libbilbc",
215 };
int frame_size
Number of samples per channel in an audio frame.
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
uint64_t channel_layout
Audio channel layout.
int sample_rate
samples per second
static enum AVSampleFormat sample_fmts[]
static av_cold int ilbc_decode_init(AVCodecContext *avctx)
#define AV_CH_LAYOUT_MONO
This structure describes decoded (raw) audio or video data.
static av_cold int ilbc_encode_init(AVCodecContext *avctx)
static const AVClass ilbc_dec_class
static const AVCodecDefault ilbc_encode_defaults[]
static int ilbc_decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
#define AV_OPT_FLAG_ENCODING_PARAM
a generic parameter which can be set by the user for muxing or encoding
static const AVClass ilbc_enc_class
#define AV_OPT_FLAG_AUDIO_PARAM
const AVCodec ff_libilbc_decoder
#define LIBAVUTIL_VERSION_INT
const AVCodec ff_libilbc_encoder
Describe the class of an AVClass context structure.
int64_t bit_rate
the average bitrate
const char * av_default_item_name(void *ptr)
Return the context name.
#define AV_CODEC_CAP_CHANNEL_CONF
Codec should fill in channel configuration and samplerate instead of container.
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
enum AVSampleFormat sample_fmt
audio sample format
static int ilbc_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)
int channels
number of audio channels
AVSampleFormat
Audio sample formats.
#define AV_OPT_FLAG_DECODING_PARAM
a generic parameter which can be set by the user for demuxing or decoding
@ AV_SAMPLE_FMT_S16
signed 16 bits
const char * name
Name of the codec implementation.
static const AVOption ilbc_enc_options[]
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs.
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
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
main external API structure.
static const AVOption ilbc_dec_options[]
This structure stores compressed data.
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
int ff_alloc_packet(AVCodecContext *avctx, AVPacket *avpkt, int64_t size)
Check AVPacket size and allocate data.
static int get_mode(AVCodecContext *avctx)
Generated on Wed Aug 24 2022 21:37:39 for FFmpeg by
doxygen
1.8.17