Libav
libvo-aacenc.c
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1 /*
2  * AAC encoder wrapper
3  * Copyright (c) 2010 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 <vo-aacenc/voAAC.h>
23 #include <vo-aacenc/cmnMemory.h>
24 
25 #include "avcodec.h"
26 #include "audio_frame_queue.h"
27 #include "internal.h"
28 #include "mpeg4audio.h"
29 
30 #define FRAME_SIZE 1024
31 #define ENC_DELAY 1600
32 
33 typedef struct AACContext {
34  VO_AUDIO_CODECAPI codec_api;
35  VO_HANDLE handle;
36  VO_MEM_OPERATOR mem_operator;
37  VO_CODEC_INIT_USERDATA user_data;
38  VO_PBYTE end_buffer;
42 } AACContext;
43 
44 
45 static int aac_encode_close(AVCodecContext *avctx)
46 {
47  AACContext *s = avctx->priv_data;
48 
49  s->codec_api.Uninit(s->handle);
50  av_freep(&avctx->extradata);
52  av_freep(&s->end_buffer);
53 
54  return 0;
55 }
56 
58 {
59  AACContext *s = avctx->priv_data;
60  AACENC_PARAM params = { 0 };
61  int index, ret;
62 
63  avctx->frame_size = FRAME_SIZE;
64  avctx->delay = ENC_DELAY;
65  s->last_frame = 2;
66  ff_af_queue_init(avctx, &s->afq);
67 
68  s->end_buffer = av_mallocz(avctx->frame_size * avctx->channels * 2);
69  if (!s->end_buffer) {
70  ret = AVERROR(ENOMEM);
71  goto error;
72  }
73 
74  voGetAACEncAPI(&s->codec_api);
75 
76  s->mem_operator.Alloc = cmnMemAlloc;
77  s->mem_operator.Copy = cmnMemCopy;
78  s->mem_operator.Free = cmnMemFree;
79  s->mem_operator.Set = cmnMemSet;
80  s->mem_operator.Check = cmnMemCheck;
81  s->user_data.memflag = VO_IMF_USERMEMOPERATOR;
82  s->user_data.memData = &s->mem_operator;
83  s->codec_api.Init(&s->handle, VO_AUDIO_CodingAAC, &s->user_data);
84 
85  params.sampleRate = avctx->sample_rate;
86  params.bitRate = avctx->bit_rate;
87  params.nChannels = avctx->channels;
88  params.adtsUsed = !(avctx->flags & CODEC_FLAG_GLOBAL_HEADER);
89  if (s->codec_api.SetParam(s->handle, VO_PID_AAC_ENCPARAM, &params)
90  != VO_ERR_NONE) {
91  av_log(avctx, AV_LOG_ERROR, "Unable to set encoding parameters\n");
92  ret = AVERROR(EINVAL);
93  goto error;
94  }
95 
96  for (index = 0; index < 16; index++)
97  if (avctx->sample_rate == avpriv_mpeg4audio_sample_rates[index])
98  break;
99  if (index == 16) {
100  av_log(avctx, AV_LOG_ERROR, "Unsupported sample rate %d\n",
101  avctx->sample_rate);
102  ret = AVERROR(ENOSYS);
103  goto error;
104  }
105  if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) {
106  avctx->extradata_size = 2;
107  avctx->extradata = av_mallocz(avctx->extradata_size +
109  if (!avctx->extradata) {
110  ret = AVERROR(ENOMEM);
111  goto error;
112  }
113 
114  avctx->extradata[0] = 0x02 << 3 | index >> 1;
115  avctx->extradata[1] = (index & 0x01) << 7 | avctx->channels << 3;
116  }
117  return 0;
118 error:
119  aac_encode_close(avctx);
120  return ret;
121 }
122 
123 static int aac_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
124  const AVFrame *frame, int *got_packet_ptr)
125 {
126  AACContext *s = avctx->priv_data;
127  VO_CODECBUFFER input = { 0 }, output = { 0 };
128  VO_AUDIO_OUTPUTINFO output_info = { { 0 } };
129  VO_PBYTE samples;
130  int ret;
131 
132  /* handle end-of-stream small frame and flushing */
133  if (!frame) {
134  if (s->last_frame <= 0)
135  return 0;
136  if (s->last_samples > 0 && s->last_samples < ENC_DELAY - FRAME_SIZE) {
137  s->last_samples = 0;
138  s->last_frame--;
139  }
140  s->last_frame--;
141  memset(s->end_buffer, 0, 2 * avctx->channels * avctx->frame_size);
142  samples = s->end_buffer;
143  } else {
144  if (frame->nb_samples < avctx->frame_size) {
145  s->last_samples = frame->nb_samples;
146  memcpy(s->end_buffer, frame->data[0], 2 * avctx->channels * frame->nb_samples);
147  samples = s->end_buffer;
148  } else {
149  samples = (VO_PBYTE)frame->data[0];
150  }
151  /* add current frame to the queue */
152  if ((ret = ff_af_queue_add(&s->afq, frame)) < 0)
153  return ret;
154  }
155 
156  if ((ret = ff_alloc_packet(avpkt, FFMAX(8192, 768 * avctx->channels)))) {
157  av_log(avctx, AV_LOG_ERROR, "Error getting output packet\n");
158  return ret;
159  }
160 
161  input.Buffer = samples;
162  input.Length = 2 * avctx->channels * avctx->frame_size;
163  output.Buffer = avpkt->data;
164  output.Length = avpkt->size;
165 
166  s->codec_api.SetInputData(s->handle, &input);
167  if (s->codec_api.GetOutputData(s->handle, &output, &output_info)
168  != VO_ERR_NONE) {
169  av_log(avctx, AV_LOG_ERROR, "Unable to encode frame\n");
170  return AVERROR(EINVAL);
171  }
172 
173  /* Get the next frame pts/duration */
174  ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts,
175  &avpkt->duration);
176 
177  avpkt->size = output.Length;
178  *got_packet_ptr = 1;
179  return 0;
180 }
181 
183  .name = "libvo_aacenc",
184  .long_name = NULL_IF_CONFIG_SMALL("Android VisualOn AAC (Advanced Audio Coding)"),
185  .type = AVMEDIA_TYPE_AUDIO,
186  .id = AV_CODEC_ID_AAC,
187  .priv_data_size = sizeof(AACContext),
189  .encode2 = aac_encode_frame,
192  .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
194 };
#define ENC_DELAY
Definition: libvo-aacenc.c:31
This structure describes decoded (raw) audio or video data.
Definition: frame.h:135
HANDLE_AACENCODER handle
Definition: libfdk-aacenc.c:31
int size
Definition: avcodec.h:974
AVCodec.
Definition: avcodec.h:2812
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:198
AVCodec ff_libvo_aacenc_encoder
Definition: libvo-aacenc.c:182
#define av_cold
Definition: attributes.h:66
AudioFrameQueue afq
Definition: libfdk-aacenc.c:39
#define CODEC_FLAG_GLOBAL_HEADER
Place global headers in extradata instead of every keyframe.
Definition: avcodec.h:657
av_cold void ff_af_queue_init(AVCodecContext *avctx, AudioFrameQueue *afq)
Initialize AudioFrameQueue.
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1164
uint8_t * data
Definition: avcodec.h:973
static av_cold int aac_encode_init(AVCodecContext *avctx)
Definition: libvo-aacenc.c:57
VO_PBYTE end_buffer
Definition: libvo-aacenc.c:38
int duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:991
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:123
VO_MEM_OPERATOR mem_operator
Definition: libvo-aacenc.c:36
#define CODEC_CAP_DELAY
Encoder or decoder requires flushing with NULL input at the end in order to give the complete and cor...
Definition: avcodec.h:713
#define AVERROR(e)
Definition: error.h:43
sample_fmts
Definition: avconv_filter.c:68
#define CODEC_CAP_SMALL_LAST_FRAME
Codec can be fed a final frame with a smaller size.
Definition: avcodec.h:718
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:145
int flags
CODEC_FLAG_*.
Definition: avcodec.h:1144
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:169
const char * name
Name of the codec implementation.
Definition: avcodec.h:2819
int ff_af_queue_add(AudioFrameQueue *afq, const AVFrame *f)
Add a frame to the queue.
#define FFMAX(a, b)
Definition: common.h:55
#define FF_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:531
int bit_rate
the average bitrate
Definition: avcodec.h:1114
VO_CODEC_INIT_USERDATA user_data
Definition: libvo-aacenc.c:37
int last_frame
Definition: libvo-aacenc.c:40
#define FRAME_SIZE
Definition: libvo-aacenc.c:30
int ff_alloc_packet(AVPacket *avpkt, int size)
Check AVPacket size and/or allocate data.
Definition: utils.c:1257
int last_samples
Definition: libvo-aacenc.c:41
int frame_size
Number of samples per channel in an audio frame.
Definition: avcodec.h:1827
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:1807
main external API structure.
Definition: avcodec.h:1050
static void close(AVCodecParserContext *s)
Definition: h264_parser.c:490
int extradata_size
Definition: avcodec.h:1165
int index
Definition: gxfenc.c:72
main AAC context
Definition: aac.h:262
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:141
const int avpriv_mpeg4audio_sample_rates[16]
Definition: mpeg4audio.c:55
static int aac_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)
Definition: libvo-aacenc.c:123
static int aac_encode_close(AVCodecContext *avctx)
Definition: libvo-aacenc.c:45
common internal 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:1092
void ff_af_queue_remove(AudioFrameQueue *afq, int nb_samples, int64_t *pts, int *duration)
Remove frame(s) from the queue.
int channels
number of audio channels
Definition: avcodec.h:1808
void ff_af_queue_close(AudioFrameQueue *afq)
Close AudioFrameQueue.
VO_AUDIO_CODECAPI codec_api
Definition: libvo-aacenc.c:34
This structure stores compressed data.
Definition: avcodec.h:950
int delay
Codec delay.
Definition: avcodec.h:1212
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:179
void * av_mallocz(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:205
VO_HANDLE handle
Definition: libvo-aacenc.c:35
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:966