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 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 <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 class = {
50 };
51 
52 static int get_wb_bitrate_mode(int bitrate, void *log_ctx)
53 {
54  /* make the correspondance between bitrate and mode */
55  static const int rates[] = { 6600, 8850, 12650, 14250, 15850, 18250,
56  19850, 23050, 23850 };
57  int i, best = -1, min_diff = 0;
58  char log_buf[200];
59 
60  for (i = 0; i < 9; i++) {
61  if (rates[i] == bitrate)
62  return i;
63  if (best < 0 || abs(rates[i] - bitrate) < min_diff) {
64  best = i;
65  min_diff = abs(rates[i] - bitrate);
66  }
67  }
68  /* no bitrate matching exactly, log a warning */
69  snprintf(log_buf, sizeof(log_buf), "bitrate not supported: use one of ");
70  for (i = 0; i < 9; i++)
71  av_strlcatf(log_buf, sizeof(log_buf), "%.2fk, ", rates[i] / 1000.f);
72  av_strlcatf(log_buf, sizeof(log_buf), "using %.2fk", rates[best] / 1000.f);
73  av_log(log_ctx, AV_LOG_WARNING, "%s\n", log_buf);
74 
75  return best;
76 }
77 
79 {
80  AMRWBContext *s = avctx->priv_data;
81 
82  if (avctx->sample_rate != 16000) {
83  av_log(avctx, AV_LOG_ERROR, "Only 16000Hz sample rate supported\n");
84  return AVERROR(ENOSYS);
85  }
86 
87  if (avctx->channels != 1) {
88  av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
89  return AVERROR(ENOSYS);
90  }
91 
92  s->mode = get_wb_bitrate_mode(avctx->bit_rate, avctx);
93  s->last_bitrate = avctx->bit_rate;
94 
95  avctx->frame_size = 320;
96  avctx->delay = 80;
97 #if FF_API_OLD_ENCODE_AUDIO
99  if (!avctx->coded_frame)
100  return AVERROR(ENOMEM);
101 #endif
102 
103  s->state = E_IF_init();
104 
105  return 0;
106 }
107 
109 {
110  AMRWBContext *s = avctx->priv_data;
111 
112  E_IF_exit(s->state);
113  av_freep(&avctx->coded_frame);
114  return 0;
115 }
116 
117 static int amr_wb_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
118  const AVFrame *frame, int *got_packet_ptr)
119 {
120  AMRWBContext *s = avctx->priv_data;
121  const int16_t *samples = (const int16_t *)frame->data[0];
122  int size, ret;
123 
124  if ((ret = ff_alloc_packet(avpkt, MAX_PACKET_SIZE))) {
125  av_log(avctx, AV_LOG_ERROR, "Error getting output packet\n");
126  return ret;
127  }
128 
129  if (s->last_bitrate != avctx->bit_rate) {
130  s->mode = get_wb_bitrate_mode(avctx->bit_rate, avctx);
131  s->last_bitrate = avctx->bit_rate;
132  }
133  size = E_IF_encode(s->state, s->mode, samples, avpkt->data, s->allow_dtx);
134  if (size <= 0 || size > MAX_PACKET_SIZE) {
135  av_log(avctx, AV_LOG_ERROR, "Error encoding frame\n");
136  return AVERROR(EINVAL);
137  }
138 
139  if (frame->pts != AV_NOPTS_VALUE)
140  avpkt->pts = frame->pts - ff_samples_to_time_base(avctx, avctx->delay);
141 
142  avpkt->size = size;
143  *got_packet_ptr = 1;
144  return 0;
145 }
146 
148  .name = "libvo_amrwbenc",
149  .type = AVMEDIA_TYPE_AUDIO,
150  .id = AV_CODEC_ID_AMR_WB,
151  .priv_data_size = sizeof(AMRWBContext),
153  .encode2 = amr_wb_encode_frame,
155  .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
157  .long_name = NULL_IF_CONFIG_SMALL("Android VisualOn AMR-WB "
158  "(Adaptive Multi-Rate Wide-Band)"),
159  .priv_class = &class,
160 };
AVClass * av_class
static int16_t * samples
int size
This structure describes decoded (raw) audio or video data.
Definition: avcodec.h:989
AVOption.
Definition: opt.h:233
av_default_item_name
memory handling functions
AVFrame * coded_frame
the picture in the bitstream
Definition: avcodec.h:2725
int size
Definition: avcodec.h:916
static int amr_wb_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)
signed 16 bits
Definition: samplefmt.h:52
AVCodec.
Definition: avcodec.h:2960
void av_freep(void *arg)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...
Definition: mem.c:151
struct AMRWBContext AMRWBContext
AVOptions.
int64_t pts
presentation timestamp in time_base units (time when frame should be shown to user) If AV_NOPTS_VALUE...
Definition: avcodec.h:1088
static const AVOption options[]
uint8_t * data
Definition: avcodec.h:915
static int init(AVCodecParserContext *s)
Definition: h264_parser.c:335
static const int rates[]
sample_fmts
Definition: avconv_filter.c:63
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:88
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:146
const char * name
Name of the codec implementation.
Definition: avcodec.h:2967
common internal API header
AVFrame * avcodec_alloc_frame(void)
Allocate an AVFrame and set its fields to default values.
Definition: utils.c:618
static int get_wb_bitrate_mode(int bitrate, void *log_ctx)
int bit_rate
the average bitrate
Definition: avcodec.h:1404
int ff_alloc_packet(AVPacket *avpkt, int size)
Check AVPacket size and/or allocate data.
Definition: utils.c:880
LIBAVUTIL_VERSION_INT
Definition: eval.c:52
int frame_size
Number of samples per channel in an audio frame.
Definition: avcodec.h:2124
NULL
Definition: eval.c:52
external API header
AV_SAMPLE_FMT_NONE
Definition: avconv_filter.c:63
int sample_rate
samples per second
Definition: avcodec.h:2104
main external API structure.
Definition: avcodec.h:1339
static void close(AVCodecParserContext *s)
Definition: h264_parser.c:326
#define MAX_PACKET_SIZE
Describe the class of an AVClass context structure.
Definition: log.h:33
size_t av_strlcatf(char *dst, size_t size, const char *fmt,...)
Definition: avstring.c:85
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: avcodec.h:997
common internal api header.
AVSampleFormat
Audio Sample Formats.
Definition: samplefmt.h:49
static int amr_wb_encode_close(AVCodecContext *avctx)
static av_cold int amr_wb_encode_init(AVCodecContext *avctx)
void * priv_data
Definition: avcodec.h:1382
int channels
number of audio channels
Definition: avcodec.h:2105
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:140
This structure stores compressed data.
Definition: avcodec.h:898
int delay
Codec delay.
Definition: avcodec.h:1497
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:908
AVCodec ff_libvo_amrwbenc_encoder
if(!(ptr_align%ac->ptr_align)&&samples_align >=aligned_len)