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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 };
AVClass * av_class
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:768
This structure describes decoded (raw) audio or video data.
Definition: frame.h:201
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:1538
#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:1401
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:193
static int amr_wb_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)
AVCodec.
Definition: avcodec.h:3351
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.
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:294
static AVFrame * frame
uint8_t * data
Definition: avcodec.h:1400
ptrdiff_t size
Definition: opengl_enc.c:101
#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:2550
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define AVERROR(e)
Definition: error.h:43
#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:2989
const char * name
Name of the codec implementation.
Definition: avcodec.h:3358
common internal API header
static int get_wb_bitrate_mode(int bitrate, void *log_ctx)
int frame_size
Number of samples per channel in an audio frame.
Definition: avcodec.h:2163
Libavcodec external API header.
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:58
int sample_rate
samples per second
Definition: avcodec.h:2143
main external API structure.
Definition: avcodec.h:1488
#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:215
static const AVOption options[]
common internal api header.
if(ret< 0)
Definition: vf_mcdeint.c:279
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:1515
int channels
number of audio channels
Definition: avcodec.h:2144
static enum AVSampleFormat sample_fmts[]
Definition: adpcmenc.c:701
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:290
static const int rates[]
Definition: avresample.c:176
This structure stores compressed data.
Definition: avcodec.h:1377
int strict_std_compliance
strictly follow the standard (MPEG-4, ...).
Definition: avcodec.h:2546
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1393
AVCodec ff_libvo_amrwbenc_encoder
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248