FFmpeg
libvo-amrwbenc.c
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1 /*
2  * AMR Audio encoder stub
3  * Copyright (c) 2003 The FFmpeg project
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 <vo-amrwbenc/enc_if.h>
23 #include <stdio.h>
24 #include <stdlib.h>
25 
26 #include "libavutil/avstring.h"
27 #include "libavutil/internal.h"
28 #include "libavutil/mem.h"
29 #include "libavutil/opt.h"
30 #include "avcodec.h"
31 #include "internal.h"
32 
33 #define MAX_PACKET_SIZE (1 + (477 + 7) / 8)
34 
35 typedef struct AMRWBContext {
37  void *state;
38  int mode;
40  int allow_dtx;
41 } AMRWBContext;
42 
43 static const AVOption options[] = {
44  { "dtx", "Allow DTX (generate comfort noise)", offsetof(AMRWBContext, allow_dtx), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM },
45  { NULL }
46 };
47 
48 static const AVClass amrwb_class = {
49  .class_name = "libvo_amrwbenc",
50  .item_name = av_default_item_name,
51  .option = options,
52  .version = LIBAVUTIL_VERSION_INT,
53 };
54 
55 static int get_wb_bitrate_mode(int bitrate, void *log_ctx)
56 {
57  /* make the correspondence between bitrate and mode */
58  static const int rates[] = { 6600, 8850, 12650, 14250, 15850, 18250,
59  19850, 23050, 23850 };
60  int i, best = -1, min_diff = 0;
61  char log_buf[200];
62 
63  for (i = 0; i < 9; i++) {
64  if (rates[i] == bitrate)
65  return i;
66  if (best < 0 || abs(rates[i] - bitrate) < min_diff) {
67  best = i;
68  min_diff = abs(rates[i] - bitrate);
69  }
70  }
71  /* no bitrate matching exactly, log a warning */
72  snprintf(log_buf, sizeof(log_buf), "bitrate not supported: use one of ");
73  for (i = 0; i < 9; i++)
74  av_strlcatf(log_buf, sizeof(log_buf), "%.2fk, ", rates[i] / 1000.f);
75  av_strlcatf(log_buf, sizeof(log_buf), "using %.2fk", rates[best] / 1000.f);
76  av_log(log_ctx, AV_LOG_WARNING, "%s\n", log_buf);
77 
78  return best;
79 }
80 
82 {
83  AMRWBContext *s = avctx->priv_data;
84 
85  if (avctx->sample_rate != 16000 && avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
86  av_log(avctx, AV_LOG_ERROR, "Only 16000Hz sample rate supported\n");
87  return AVERROR(ENOSYS);
88  }
89 
90  if (avctx->channels != 1) {
91  av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
92  return AVERROR(ENOSYS);
93  }
94 
95  s->mode = get_wb_bitrate_mode(avctx->bit_rate, avctx);
96  s->last_bitrate = avctx->bit_rate;
97 
98  avctx->frame_size = 320;
99  avctx->initial_padding = 80;
100 
101  s->state = E_IF_init();
102 
103  return 0;
104 }
105 
107 {
108  AMRWBContext *s = avctx->priv_data;
109 
110  E_IF_exit(s->state);
111  return 0;
112 }
113 
114 static int amr_wb_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
115  const AVFrame *frame, int *got_packet_ptr)
116 {
117  AMRWBContext *s = avctx->priv_data;
118  const int16_t *samples = (const int16_t *)frame->data[0];
119  int size, ret;
120 
121  if ((ret = ff_alloc_packet2(avctx, avpkt, MAX_PACKET_SIZE, 0)) < 0)
122  return ret;
123 
124  if (s->last_bitrate != avctx->bit_rate) {
125  s->mode = get_wb_bitrate_mode(avctx->bit_rate, avctx);
126  s->last_bitrate = avctx->bit_rate;
127  }
128  size = E_IF_encode(s->state, s->mode, samples, avpkt->data, s->allow_dtx);
130  av_log(avctx, AV_LOG_ERROR, "Error encoding frame\n");
131  return AVERROR(EINVAL);
132  }
133 
134  if (frame->pts != AV_NOPTS_VALUE)
135  avpkt->pts = frame->pts - ff_samples_to_time_base(avctx, avctx->initial_padding);
136 
137  avpkt->size = size;
138  *got_packet_ptr = 1;
139  return 0;
140 }
141 
143  .name = "libvo_amrwbenc",
144  .long_name = NULL_IF_CONFIG_SMALL("Android VisualOn AMR-WB "
145  "(Adaptive Multi-Rate Wide-Band)"),
146  .type = AVMEDIA_TYPE_AUDIO,
147  .id = AV_CODEC_ID_AMR_WB,
148  .priv_data_size = sizeof(AMRWBContext),
150  .encode2 = amr_wb_encode_frame,
151  .close = amr_wb_encode_close,
152  .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
154  .priv_class = &amrwb_class,
155  .wrapper_name = "libvo_amrwbenc",
156 };
AMRWBFrame frame
AMRWB parameters decoded from bitstream.
Definition: amrwbdec.c:48
AVClass * av_class
#define NULL
Definition: coverity.c:32
This structure describes decoded (raw) audio or video data.
Definition: frame.h:295
AVOption.
Definition: opt.h:246
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
int64_t bit_rate
the average bitrate
Definition: avcodec.h:1615
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
Memory handling functions.
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
#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 amr_wb_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)
AVCodec.
Definition: avcodec.h:3481
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
#define av_cold
Definition: attributes.h:82
static const AVClass amrwb_class
AVOptions.
#define f(width, name)
Definition: cbs_vp9.c:255
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:388
uint8_t * data
Definition: avcodec.h:1477
ptrdiff_t size
Definition: opengl_enc.c:100
#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 FF_COMPLIANCE_UNOFFICIAL
Allow unofficial extensions.
Definition: avcodec.h:2632
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
#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
int initial_padding
Audio only.
Definition: avcodec.h:3096
const char * name
Name of the codec implementation.
Definition: avcodec.h:3488
common internal API header
static int get_wb_bitrate_mode(int bitrate, void *log_ctx)
#define s(width, name)
Definition: cbs_vp9.c:257
if(ret)
int frame_size
Number of samples per channel in an audio frame.
Definition: avcodec.h:2245
Libavcodec external API header.
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:58
int sample_rate
samples per second
Definition: avcodec.h:2225
#define abs(x)
Definition: cuda_runtime.h:35
main external API structure.
Definition: avcodec.h:1565
#define MAX_PACKET_SIZE
Describe the class of an AVClass context structure.
Definition: log.h:67
size_t av_strlcatf(char *dst, size_t size, const char *fmt,...)
Definition: avstring.c:101
#define snprintf
Definition: snprintf.h:34
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:309
static const AVOption options[]
int64_t bitrate
Definition: h264_levels.c:131
common internal api header.
signed 16 bits
Definition: samplefmt.h:61
static int amr_wb_encode_close(AVCodecContext *avctx)
static av_cold int amr_wb_encode_init(AVCodecContext *avctx)
void * priv_data
Definition: avcodec.h:1592
int channels
number of audio channels
Definition: avcodec.h:2226
static enum AVSampleFormat sample_fmts[]
Definition: adpcmenc.c:701
Filter the word “frame” indicates either a video frame or a group of audio samples
static av_always_inline int64_t ff_samples_to_time_base(AVCodecContext *avctx, int64_t samples)
Rescale from sample rate to AVCodecContext.time_base.
Definition: internal.h:288
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
static const int rates[]
Definition: avresample.c:176
This structure stores compressed data.
Definition: avcodec.h:1454
int strict_std_compliance
strictly follow the standard (MPEG-4, ...).
Definition: avcodec.h:2628
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1470
AVCodec ff_libvo_amrwbenc_encoder
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248