FFmpeg
libvorbisdec.c
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1 /*
2  * Copyright (c) 2002 Mark Hills <mark@pogo.org.uk>
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include <vorbis/vorbisenc.h>
22 
23 #include "avcodec.h"
24 #include "bytestream.h"
25 #include "codec_internal.h"
26 #include "decode.h"
27 
28 typedef struct OggVorbisDecContext {
29  vorbis_info vi; /**< vorbis_info used during init */
30  vorbis_dsp_state vd; /**< DSP state used for analysis */
31  vorbis_block vb; /**< vorbis_block used for analysis */
32  vorbis_comment vc; /**< VorbisComment info */
33  ogg_packet op; /**< ogg packet */
35 
36 static int oggvorbis_decode_close(AVCodecContext *avccontext);
37 
38 static int oggvorbis_decode_init(AVCodecContext *avccontext) {
39  OggVorbisDecContext *context = avccontext->priv_data ;
40  uint8_t *p= avccontext->extradata;
41  int i, hsizes[3], ret;
42  unsigned char *headers[3], *extradata = avccontext->extradata;
43 
44  if(! avccontext->extradata_size || ! p) {
45  av_log(avccontext, AV_LOG_ERROR, "vorbis extradata absent\n");
46  return AVERROR(EINVAL);
47  }
48 
49  vorbis_info_init(&context->vi) ;
50  vorbis_comment_init(&context->vc) ;
51 
52  if(p[0] == 0 && p[1] == 30) {
53  int sizesum = 0;
54  for(i = 0; i < 3; i++){
55  hsizes[i] = bytestream_get_be16((const uint8_t **)&p);
56  sizesum += 2 + hsizes[i];
57  if (sizesum > avccontext->extradata_size) {
58  av_log(avccontext, AV_LOG_ERROR, "vorbis extradata too small\n");
60  goto error;
61  }
62 
63  headers[i] = p;
64  p += hsizes[i];
65  }
66  } else if(*p == 2) {
67  unsigned int offset = 1;
68  unsigned int sizesum = 1;
69  p++;
70  for(i=0; i<2; i++) {
71  hsizes[i] = 0;
72  while((*p == 0xFF) && (sizesum < avccontext->extradata_size)) {
73  hsizes[i] += 0xFF;
74  offset++;
75  sizesum += 1 + 0xFF;
76  p++;
77  }
78  hsizes[i] += *p;
79  offset++;
80  sizesum += 1 + *p;
81  if(sizesum > avccontext->extradata_size) {
82  av_log(avccontext, AV_LOG_ERROR,
83  "vorbis header sizes damaged\n");
85  goto error;
86  }
87  p++;
88  }
89  hsizes[2] = avccontext->extradata_size - hsizes[0]-hsizes[1]-offset;
90 #if 0
91  av_log(avccontext, AV_LOG_DEBUG,
92  "vorbis header sizes: %d, %d, %d, / extradata_len is %d \n",
93  hsizes[0], hsizes[1], hsizes[2], avccontext->extradata_size);
94 #endif
95  headers[0] = extradata + offset;
96  headers[1] = extradata + offset + hsizes[0];
97  headers[2] = extradata + offset + hsizes[0] + hsizes[1];
98  } else {
99  av_log(avccontext, AV_LOG_ERROR,
100  "vorbis initial header len is wrong: %d\n", *p);
102  goto error;
103  }
104 
105  for(i=0; i<3; i++){
106  context->op.b_o_s= i==0;
107  context->op.bytes = hsizes[i];
108  context->op.packet = headers[i];
109  if(vorbis_synthesis_headerin(&context->vi, &context->vc, &context->op)<0){
110  av_log(avccontext, AV_LOG_ERROR, "%d. vorbis header damaged\n", i+1);
112  goto error;
113  }
114  }
115 
116  av_channel_layout_uninit(&avccontext->ch_layout);
118  avccontext->ch_layout.nb_channels = context->vi.channels;
119  avccontext->sample_rate = context->vi.rate;
120  avccontext->sample_fmt = AV_SAMPLE_FMT_S16;
121  avccontext->time_base= (AVRational){1, avccontext->sample_rate};
122 
123  vorbis_synthesis_init(&context->vd, &context->vi);
124  vorbis_block_init(&context->vd, &context->vb);
125 
126  return 0 ;
127 
128  error:
129  oggvorbis_decode_close(avccontext);
130  return ret;
131 }
132 
133 
134 static inline int conv(int samples, float **pcm, char *buf, int channels) {
135  int i, j;
136  ogg_int16_t *ptr, *data = (ogg_int16_t*)buf ;
137  float *mono ;
138 
139  for(i = 0 ; i < channels ; i++){
140  ptr = &data[i];
141  mono = pcm[i] ;
142 
143  for(j = 0 ; j < samples ; j++) {
144  *ptr = av_clip_int16(mono[j] * 32767.f);
145  ptr += channels;
146  }
147  }
148 
149  return 0 ;
150 }
151 
153  int *got_frame_ptr, AVPacket *avpkt)
154 {
155  OggVorbisDecContext *context = avccontext->priv_data ;
156  float **pcm ;
157  ogg_packet *op= &context->op;
158  int samples, total_samples, total_bytes;
159  int ret;
160  int16_t *output;
161 
162  if(!avpkt->size){
163  //FIXME flush
164  return 0;
165  }
166 
167  frame->nb_samples = 8192*4;
168  if ((ret = ff_get_buffer(avccontext, frame, 0)) < 0)
169  return ret;
170  output = (int16_t *)frame->data[0];
171 
172 
173  op->packet = avpkt->data;
174  op->bytes = avpkt->size;
175 
176 // av_log(avccontext, AV_LOG_DEBUG, "%d %d %d %"PRId64" %"PRId64" %d %d\n", op->bytes, op->b_o_s, op->e_o_s, op->granulepos, op->packetno, buf_size, context->vi.rate);
177 
178 /* for(i=0; i<op->bytes; i++)
179  av_log(avccontext, AV_LOG_DEBUG, "%02X ", op->packet[i]);
180  av_log(avccontext, AV_LOG_DEBUG, "\n");*/
181 
182  if(vorbis_synthesis(&context->vb, op) == 0)
183  vorbis_synthesis_blockin(&context->vd, &context->vb) ;
184 
185  total_samples = 0 ;
186  total_bytes = 0 ;
187 
188  while((samples = vorbis_synthesis_pcmout(&context->vd, &pcm)) > 0) {
189  conv(samples, pcm, (char*)output + total_bytes, context->vi.channels) ;
190  total_bytes += samples * 2 * context->vi.channels ;
191  total_samples += samples ;
192  vorbis_synthesis_read(&context->vd, samples) ;
193  }
194 
195  frame->nb_samples = total_samples;
196  *got_frame_ptr = total_samples > 0;
197  return avpkt->size;
198 }
199 
200 
201 static int oggvorbis_decode_close(AVCodecContext *avccontext) {
202  OggVorbisDecContext *context = avccontext->priv_data ;
203 
204  vorbis_block_clear(&context->vb);
205  vorbis_dsp_clear(&context->vd);
206  vorbis_info_clear(&context->vi) ;
207  vorbis_comment_clear(&context->vc) ;
208 
209  return 0 ;
210 }
211 
212 
214  .p.name = "libvorbis",
215  CODEC_LONG_NAME("libvorbis"),
216  .p.type = AVMEDIA_TYPE_AUDIO,
217  .p.id = AV_CODEC_ID_VORBIS,
218  .p.capabilities = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_CHANNEL_CONF,
219  .caps_internal = FF_CODEC_CAP_NOT_INIT_THREADSAFE,
220  .priv_data_size = sizeof(OggVorbisDecContext),
223  .close = oggvorbis_decode_close,
224 };
error
static void error(const char *err)
Definition: target_bsf_fuzzer.c:31
OggVorbisDecContext::vd
vorbis_dsp_state vd
DSP state used for analysis
Definition: libvorbisdec.c:30
AVERROR
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
AVCodecContext::sample_rate
int sample_rate
samples per second
Definition: avcodec.h:1007
output
filter_frame For filters that do not use the this method is called when a frame is pushed to the filter s input It can be called at any time except in a reentrant way If the input frame is enough to produce output
Definition: filter_design.txt:225
oggvorbis_decode_init
static int oggvorbis_decode_init(AVCodecContext *avccontext)
Definition: libvorbisdec.c:38
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:325
AVPacket::data
uint8_t * data
Definition: packet.h:374
data
const char data[16]
Definition: mxf.c:146
FF_CODEC_CAP_NOT_INIT_THREADSAFE
#define FF_CODEC_CAP_NOT_INIT_THREADSAFE
The codec is not known to be init-threadsafe (i.e.
Definition: codec_internal.h:34
FFCodec
Definition: codec_internal.h:119
AVChannelLayout::order
enum AVChannelOrder order
Channel order used in this layout.
Definition: channel_layout.h:306
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:311
OggVorbisDecContext::vi
vorbis_info vi
vorbis_info used during init
Definition: libvorbisdec.c:29
OggVorbisDecContext::vb
vorbis_block vb
vorbis_block used for analysis
Definition: libvorbisdec.c:31
FFCodec::p
AVCodec p
The public AVCodec.
Definition: codec_internal.h:123
AVCodecContext::ch_layout
AVChannelLayout ch_layout
Audio channel layout.
Definition: avcodec.h:2059
ogg_packet
static int ogg_packet(AVFormatContext *s, int *sid, int *dstart, int *dsize, int64_t *fpos)
find the next Ogg packet
Definition: oggdec.c:497
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
AVCodecContext::extradata_size
int extradata_size
Definition: avcodec.h:500
FF_CODEC_DECODE_CB
#define FF_CODEC_DECODE_CB(func)
Definition: codec_internal.h:298
OggVorbisDecContext::op
ogg_packet op
ogg packet
Definition: libvorbisdec.c:33
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
op
static int op(uint8_t **dst, const uint8_t *dst_end, GetByteContext *gb, int pixel, int count, int *x, int width, int linesize)
Perform decode operation.
Definition: anm.c:76
AV_CHANNEL_ORDER_UNSPEC
@ AV_CHANNEL_ORDER_UNSPEC
Only the channel count is specified, without any further information about the channel order.
Definition: channel_layout.h:112
init
int(* init)(AVBSFContext *ctx)
Definition: dts2pts_bsf.c:363
AV_LOG_DEBUG
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:201
channels
channels
Definition: aptx.h:31
decode.h
CODEC_LONG_NAME
#define CODEC_LONG_NAME(str)
Definition: codec_internal.h:264
conv
static int conv(int samples, float **pcm, char *buf, int channels)
Definition: libvorbisdec.c:134
context
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf default minimum maximum flags name is the option keep it simple and lowercase description are in without and describe what they for example set the foo of the bar offset is the offset of the field in your context
Definition: writing_filters.txt:91
av_clip_int16
#define av_clip_int16
Definition: common.h:110
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
oggvorbis_decode_frame
static int oggvorbis_decode_frame(AVCodecContext *avccontext, AVFrame *frame, int *got_frame_ptr, AVPacket *avpkt)
Definition: libvorbisdec.c:152
AV_CODEC_CAP_CHANNEL_CONF
#define AV_CODEC_CAP_CHANNEL_CONF
Codec should fill in channel configuration and samplerate instead of container.
Definition: codec.h:109
AVCodecContext::time_base
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented.
Definition: avcodec.h:521
f
f
Definition: af_crystalizer.c:122
ff_get_buffer
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1450
AVPacket::size
int size
Definition: packet.h:375
ff_libvorbis_decoder
const FFCodec ff_libvorbis_decoder
Definition: libvorbisdec.c:213
codec_internal.h
AVCodecContext::sample_fmt
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:1023
offset
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
Definition: writing_filters.txt:86
OggVorbisDecContext::vc
vorbis_comment vc
VorbisComment info
Definition: libvorbisdec.c:32
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
AVCodecContext::extradata
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:499
AV_SAMPLE_FMT_S16
@ AV_SAMPLE_FMT_S16
signed 16 bits
Definition: samplefmt.h:58
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:211
avcodec.h
ret
ret
Definition: filter_design.txt:187
frame
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
Definition: filter_design.txt:264
AVCodecContext
main external API structure.
Definition: avcodec.h:398
headers
FFmpeg currently uses a custom build this text attempts to document some of its obscure features and options Makefile the full command issued by make and its output will be shown on the screen DBG Preprocess x86 external assembler files to a dbg asm file in the object which then gets compiled Helps in developing those assembler files DESTDIR Destination directory for the install useful to prepare packages or install FFmpeg in cross environments GEN Set to ‘1’ to generate the missing or mismatched references Makefile builds all the libraries and the executables fate Run the fate test note that you must have installed it fate list List all fate regression test targets install Install headers
Definition: build_system.txt:34
av_channel_layout_uninit
void av_channel_layout_uninit(AVChannelLayout *channel_layout)
Free any allocated data in the channel layout and reset the channel count to 0.
Definition: channel_layout.c:632
AV_CODEC_CAP_DELAY
#define AV_CODEC_CAP_DELAY
Encoder or decoder requires flushing with NULL input at the end in order to give the complete and cor...
Definition: codec.h:82
samples
Filter the word “frame” indicates either a video frame or a group of audio samples
Definition: filter_design.txt:8
oggvorbis_decode_close
static int oggvorbis_decode_close(AVCodecContext *avccontext)
Definition: libvorbisdec.c:201
OggVorbisDecContext
Definition: libvorbisdec.c:28
AVPacket
This structure stores compressed data.
Definition: packet.h:351
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:425
bytestream.h
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
AV_CODEC_ID_VORBIS
@ AV_CODEC_ID_VORBIS
Definition: codec_id.h:440