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aac_adtstoasc_bsf.c
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1 /*
2  * MPEG-2/4 AAC ADTS to MPEG-4 Audio Specific Configuration bitstream filter
3  * Copyright (c) 2009 Alex Converse <alex.converse@gmail.com>
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 "adts_header.h"
23 #include "adts_parser.h"
24 #include "avcodec.h"
25 #include "bsf.h"
26 #include "put_bits.h"
27 #include "get_bits.h"
28 #include "mpeg4audio.h"
29 #include "internal.h"
30 
31 typedef struct AACBSFContext {
34 
35 /**
36  * This filter creates an MPEG-4 AudioSpecificConfig from an MPEG-2/4
37  * ADTS header and removes the ADTS header.
38  */
40 {
41  AACBSFContext *ctx = bsfc->priv_data;
42 
43  GetBitContext gb;
44  PutBitContext pb;
46  AVPacket *in;
47  int ret;
48 
49  ret = ff_bsf_get_packet(bsfc, &in);
50  if (ret < 0)
51  return ret;
52 
53  if (bsfc->par_in->extradata && in->size >= 2 && (AV_RB16(in->data) >> 4) != 0xfff)
54  goto finish;
55 
56  if (in->size < AV_AAC_ADTS_HEADER_SIZE)
57  goto packet_too_small;
58 
60 
61  if (ff_adts_header_parse(&gb, &hdr) < 0) {
62  av_log(bsfc, AV_LOG_ERROR, "Error parsing ADTS frame header!\n");
63  ret = AVERROR_INVALIDDATA;
64  goto fail;
65  }
66 
67  if (!hdr.crc_absent && hdr.num_aac_frames > 1) {
69  "Multiple RDBs per frame with CRC");
71  goto fail;
72  }
73 
74  in->size -= AV_AAC_ADTS_HEADER_SIZE + 2 * !hdr.crc_absent;
75  if (in->size <= 0)
76  goto packet_too_small;
77  in->data += AV_AAC_ADTS_HEADER_SIZE + 2 * !hdr.crc_absent;
78 
79  if (!ctx->first_frame_done) {
80  int pce_size = 0;
81  uint8_t pce_data[MAX_PCE_SIZE];
82  uint8_t *extradata;
83 
84  if (!hdr.chan_config) {
85  init_get_bits(&gb, in->data, in->size * 8);
86  if (get_bits(&gb, 3) != 5) {
88  "PCE-based channel configuration "
89  "without PCE as first syntax "
90  "element");
92  goto fail;
93  }
94  init_put_bits(&pb, pce_data, MAX_PCE_SIZE);
95  pce_size = ff_copy_pce_data(&pb, &gb) / 8;
96  flush_put_bits(&pb);
97  in->size -= get_bits_count(&gb)/8;
98  in->data += get_bits_count(&gb)/8;
99  }
100 
102  2 + pce_size);
103  if (!extradata) {
104  ret = AVERROR(ENOMEM);
105  goto fail;
106  }
107 
108  init_put_bits(&pb, extradata, 2 + pce_size);
109  put_bits(&pb, 5, hdr.object_type);
110  put_bits(&pb, 4, hdr.sampling_index);
111  put_bits(&pb, 4, hdr.chan_config);
112  put_bits(&pb, 1, 0); //frame length - 1024 samples
113  put_bits(&pb, 1, 0); //does not depend on core coder
114  put_bits(&pb, 1, 0); //is not extension
115  flush_put_bits(&pb);
116  if (pce_size) {
117  memcpy(extradata + 2, pce_data, pce_size);
118  }
119 
120  ctx->first_frame_done = 1;
121  }
122 
123 finish:
124  av_packet_move_ref(out, in);
125  av_packet_free(&in);
126 
127  return 0;
128 
129 packet_too_small:
130  av_log(bsfc, AV_LOG_ERROR, "Input packet too small\n");
131  ret = AVERROR_INVALIDDATA;
132 fail:
133  av_packet_free(&in);
134  return ret;
135 }
136 
138 {
139  /* Validate the extradata if the stream is already MPEG-4 AudioSpecificConfig */
140  if (ctx->par_in->extradata) {
141  MPEG4AudioConfig mp4ac;
142  int ret = avpriv_mpeg4audio_get_config(&mp4ac, ctx->par_in->extradata,
143  ctx->par_in->extradata_size * 8, 1);
144  if (ret < 0) {
145  av_log(ctx, AV_LOG_ERROR, "Error parsing AudioSpecificConfig extradata!\n");
146  return ret;
147  }
148  }
149 
150  return 0;
151 }
152 
153 static const enum AVCodecID codec_ids[] = {
155 };
156 
158  .name = "aac_adtstoasc",
159  .priv_data_size = sizeof(AACBSFContext),
162  .codec_ids = codec_ids,
163 };
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
uint8_t object_type
Definition: adts_header.h:33
static void put_bits(Jpeg2000EncoderContext *s, int val, int n)
put n times val bit
Definition: j2kenc.c:207
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:261
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
The bitstream filter state.
Definition: avcodec.h:5583
int size
Definition: avcodec.h:1415
static int aac_adtstoasc_init(AVBSFContext *ctx)
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_WB24 unsigned int_TMPL AV_RB16
Definition: bytestream.h:87
void * priv_data
Opaque filter-specific private data.
Definition: avcodec.h:5604
static void filter(int16_t *output, ptrdiff_t out_stride, int16_t *low, ptrdiff_t low_stride, int16_t *high, ptrdiff_t high_stride, int len, int clip)
Definition: cfhd.c:97
static int aac_adtstoasc_filter(AVBSFContext *bsfc, AVPacket *out)
This filter creates an MPEG-4 AudioSpecificConfig from an MPEG-2/4 ADTS header and removes the ADTS h...
void av_packet_free(AVPacket **pkt)
Free the packet, if the packet is reference counted, it will be unreferenced first.
Definition: avpacket.c:62
uint8_t
const AVBitStreamFilter ff_aac_adtstoasc_bsf
const char * name
Definition: avcodec.h:5633
static void finish(void)
Definition: movenc.c:345
uint8_t * data
Definition: avcodec.h:1414
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:199
void av_packet_move_ref(AVPacket *dst, AVPacket *src)
Move every field in src to dst and reset src.
Definition: avpacket.c:645
bitstream reader API header.
#define av_log(a,...)
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: avcodec.h:215
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define AVERROR(e)
Definition: error.h:43
uint8_t sampling_index
Definition: adts_header.h:34
#define fail()
Definition: checkasm.h:113
#define AV_AAC_ADTS_HEADER_SIZE
Definition: adts_parser.h:25
uint8_t chan_config
Definition: adts_header.h:35
int extradata_size
Size of the extradata content in bytes.
Definition: avcodec.h:3856
uint8_t num_aac_frames
Definition: adts_header.h:36
AVFormatContext * ctx
Definition: movenc.c:48
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
int ff_adts_header_parse(GetBitContext *gbc, AACADTSHeaderInfo *hdr)
Parse the ADTS frame header to the end of the variable header, which is the first 54 bits...
Definition: adts_header.c:30
The AV_PKT_DATA_NEW_EXTRADATA is used to notify the codec or the format that the extradata buffer was...
Definition: avcodec.h:1155
Libavcodec external API header.
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(constint16_t *) pi >>8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(constint32_t *) pi >>24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(constfloat *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(constfloat *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(constfloat *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(constdouble *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(constdouble *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(constdouble *) pi *(1U<< 31))))#defineSET_CONV_FUNC_GROUP(ofmt, ifmt) staticvoidset_generic_function(AudioConvert *ac){}voidff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enumAVSampleFormatout_fmt, enumAVSampleFormatin_fmt, intchannels, intsample_rate, intapply_map){AudioConvert *ac;intin_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) returnNULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method!=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt)>2){ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc){av_free(ac);returnNULL;}returnac;}in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar){ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar?ac->channels:1;}elseif(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;elseac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);returnac;}intff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){intuse_generic=1;intlen=in->nb_samples;intp;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%dsamples-audio_convert:%sto%s(dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));returnff_convert_dither(ac-> in
static int ff_copy_pce_data(PutBitContext *pb, GetBitContext *gb)
Definition: mpeg4audio.h:131
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:425
void avpriv_report_missing_feature(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
common internal api header.
static void flush_put_bits(PutBitContext *s)
Pad the end of the output stream with zeros.
Definition: put_bits.h:101
static enum AVCodecID codec_ids[]
int ff_bsf_get_packet(AVBSFContext *ctx, AVPacket **pkt)
Called by the bitstream filters to get the next packet for filtering.
Definition: bsf.c:201
static void init_put_bits(PutBitContext *s, uint8_t *buffer, int buffer_size)
Initialize the PutBitContext s.
Definition: put_bits.h:48
#define MAX_PCE_SIZE
Maximum size of a PCE including the 3-bit ID_PCE.
Definition: mpeg4audio.h:119
int avpriv_mpeg4audio_get_config(MPEG4AudioConfig *c, const uint8_t *buf, int bit_size, int sync_extension)
Parse MPEG-4 systems extradata from a raw buffer to retrieve audio configuration. ...
Definition: mpeg4audio.c:155
uint8_t crc_absent
Definition: adts_header.h:32
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:3852
FILE * out
Definition: movenc.c:54
uint8_t * av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type, int size)
Allocate new information of a packet.
Definition: avpacket.c:329
This structure stores compressed data.
Definition: avcodec.h:1391
AVCodecParameters * par_in
Parameters of the input stream.
Definition: avcodec.h:5611
bitstream writer API