FFmpeg: libavformat/ttaenc.c Source File

FFmpeg
ttaenc.c
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1 /*
2  * True Audio (TTA) muxer
3  * Copyright (c) 2016 James Almer
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 "libavutil/crc.h"
23 #include "libavutil/intreadwrite.h"
24 
25 #include "apetag.h"
26 #include "avformat.h"
27 #include "avio_internal.h"
28 #include "internal.h"
29 
30  typedef struct TTAMuxContext {
31   AVIOContext *seek_table;
32   AVPacketList *queue, *queue_end;
33   uint32_t nb_samples;
34   int frame_size;
35   int last_frame;
36 } TTAMuxContext;
37 
38  static int tta_init(AVFormatContext *s)
39 {
40  TTAMuxContext *tta = s->priv_data;
41  AVCodecParameters *par;
42 
43  if (s->nb_streams != 1) {
44  av_log(s, AV_LOG_ERROR, "Only one stream is supported\n");
45  return AVERROR(EINVAL);
46  }
47  par = s->streams[0]->codecpar;
48 
49  if (par->codec_id != AV_CODEC_ID_TTA) {
50  av_log(s, AV_LOG_ERROR, "Unsupported codec\n");
51  return AVERROR(EINVAL);
52  }
53  if (par->extradata && par->extradata_size < 22) {
54  av_log(s, AV_LOG_ERROR, "Invalid TTA extradata\n");
55  return AVERROR_INVALIDDATA;
56  }
57 
58  /* Prevent overflow */
59  if (par->sample_rate > 0x7FFFFFu) {
60  av_log(s, AV_LOG_ERROR, "Sample rate too large\n");
61  return AVERROR(EINVAL);
62  }
63  tta->frame_size = par->sample_rate * 256 / 245;
64  avpriv_set_pts_info(s->streams[0], 64, 1, par->sample_rate);
65 
66  return 0;
67 }
68 
69  static int tta_write_header(AVFormatContext *s)
70 {
71  TTAMuxContext *tta = s->priv_data;
72  AVCodecParameters *par = s->streams[0]->codecpar;
73  int ret;
74 
75  if ((ret = avio_open_dyn_buf(&tta->seek_table)) < 0)
76  return ret;
77 
78  /* Ignore most extradata information if present. It can be innacurate
79  if for example remuxing from Matroska */
80  ffio_init_checksum(s->pb, ff_crcEDB88320_update, UINT32_MAX);
81  ffio_init_checksum(tta->seek_table, ff_crcEDB88320_update, UINT32_MAX);
82  avio_write(s->pb, "TTA1", 4);
83  avio_wl16(s->pb, par->extradata ? AV_RL16(par->extradata + 4) : 1);
84  avio_wl16(s->pb, par->channels);
85  avio_wl16(s->pb, par->bits_per_raw_sample);
86  avio_wl32(s->pb, par->sample_rate);
87 
88  return 0;
89 }
90 
91  static int tta_write_packet(AVFormatContext *s, AVPacket *pkt)
92 {
93  TTAMuxContext *tta = s->priv_data;
94  int ret;
95 
96  ret = ff_packet_list_put(&tta->queue, &tta->queue_end, pkt,
97  FF_PACKETLIST_FLAG_REF_PACKET);
98  if (ret < 0) {
99  return ret;
100  }
101 
102  avio_wl32(tta->seek_table, pkt->size);
103  tta->nb_samples += pkt->duration;
104 
105  if (tta->frame_size != pkt->duration) {
106  if (tta->last_frame) {
107  /* Two frames with a different duration than the default frame
108  size means the TTA stream comes from a faulty container, and
109  there's no way the last frame duration will be correct. */
110  av_log(s, AV_LOG_ERROR, "Invalid frame durations\n");
111 
112  return AVERROR_INVALIDDATA;
113  }
114  /* First frame with a different duration than the default frame size.
115  Assume it's the last frame in the stream and continue. */
116  tta->last_frame++;
117  }
118 
119  return 0;
120 }
121 
122  static void tta_queue_flush(AVFormatContext *s)
123 {
124  TTAMuxContext *tta = s->priv_data;
125  AVPacket pkt;
126 
127  while (tta->queue) {
128  ff_packet_list_get(&tta->queue, &tta->queue_end, &pkt);
129  avio_write(s->pb, pkt.data, pkt.size);
130  av_packet_unref(&pkt);
131  }
132 }
133 
134  static int tta_write_trailer(AVFormatContext *s)
135 {
136  TTAMuxContext *tta = s->priv_data;
137  uint8_t *ptr;
138  unsigned int crc;
139  int size;
140 
141  avio_wl32(s->pb, tta->nb_samples);
142  crc = ffio_get_checksum(s->pb) ^ UINT32_MAX;
143  avio_wl32(s->pb, crc);
144 
145  /* Write Seek table */
146  crc = ffio_get_checksum(tta->seek_table) ^ UINT32_MAX;
147  avio_wl32(tta->seek_table, crc);
148  size = avio_close_dyn_buf(tta->seek_table, &ptr);
149  avio_write(s->pb, ptr, size);
150  av_free(ptr);
151 
152  /* Write audio data */
153  tta_queue_flush(s);
154 
155  ff_ape_write_tag(s);
156  avio_flush(s->pb);
157 
158  return 0;
159 }
160 
161  AVOutputFormat ff_tta_muxer = {
162  .name = "tta",
163  .long_name = NULL_IF_CONFIG_SMALL("TTA (True Audio)"),
164  .mime_type = "audio/x-tta",
165  .extensions = "tta",
166  .priv_data_size = sizeof(TTAMuxContext),
167  .audio_codec = AV_CODEC_ID_TTA,
168  .video_codec = AV_CODEC_ID_NONE,
169  .init = tta_init,
170  .write_header = tta_write_header,
171  .write_packet = tta_write_packet,
172  .write_trailer = tta_write_trailer,
173 };
write_packet
static void write_packet(OutputFile *of, AVPacket *pkt, OutputStream *ost, int unqueue)
Definition: ffmpeg.c:679
avio_wl16
void avio_wl16(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:469
s
const char * s
Definition: avisynth_c.h:768
AVIOContext
Bytestream IO Context.
Definition: avio.h:161
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
AV_CODEC_ID_NONE
Definition: avcodec.h:216
avio_close_dyn_buf
int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
Return the written size and a pointer to the buffer.
Definition: aviobuf.c:1420
ff_packet_list_put
int ff_packet_list_put(AVPacketList **head, AVPacketList **tail, AVPacket *pkt, int flags)
Append an AVPacket to the list.
Definition: utils.c:447
avpriv_set_pts_info
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:4820
init
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
tta_write_packet
static int tta_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: ttaenc.c:91
TTAMuxContext::queue
AVPacketList * queue
Definition: ttaenc.c:32
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3884
AVPacket::size
int size
Definition: avcodec.h:1431
pkt
static AVPacket pkt
Definition: demuxing_decoding.c:54
AV_RL16
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16
Definition: bytestream.h:87
avio_open_dyn_buf
int avio_open_dyn_buf(AVIOContext **s)
Open a write only memory stream.
Definition: aviobuf.c:1391
AVCodecParameters
This struct describes the properties of an encoded stream.
Definition: avcodec.h:3876
ff_tta_muxer
AVOutputFormat ff_tta_muxer
Definition: ttaenc.c:161
AVFormatContext
Format I/O context.
Definition: avformat.h:1342
tta_write_trailer
static int tta_write_trailer(AVFormatContext *s)
Definition: ttaenc.c:134
avio_wl32
void avio_wl32(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:369
uint8_t
uint8_t
Definition: audio_convert.c:194
AVPacket::duration
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:1448
ff_crcEDB88320_update
unsigned long ff_crcEDB88320_update(unsigned long checksum, const uint8_t *buf, unsigned int len)
Definition: aviobuf.c:607
AVFormatContext::streams
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1410
FF_PACKETLIST_FLAG_REF_PACKET
#define FF_PACKETLIST_FLAG_REF_PACKET
Create a new reference for the packet instead of transferring the ownership of the existing one to th...
Definition: internal.h:744
crc.h
Public header for CRC hash function implementation.
avio_internal.h
AVPacket::data
uint8_t * data
Definition: avcodec.h:1430
size
ptrdiff_t size
Definition: opengl_enc.c:101
avio_write
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:218
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
tta_init
static int tta_init(AVFormatContext *s)
Definition: ttaenc.c:38
TTAMuxContext::queue_end
AVPacketList * queue_end
Definition: ttaenc.c:32
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
AVERROR
#define AVERROR(e)
Definition: error.h:43
tta_queue_flush
static void tta_queue_flush(AVFormatContext *s)
Definition: ttaenc.c:122
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
AVCodecParameters::extradata_size
int extradata_size
Size of the extradata content in bytes.
Definition: avcodec.h:3902
AVFormatContext::nb_streams
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1398
ffio_init_checksum
void ffio_init_checksum(AVIOContext *s, unsigned long(*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len), unsigned long checksum)
Definition: aviobuf.c:627
avio_flush
int void avio_flush(AVIOContext *s)
Force flushing of buffered data.
Definition: aviobuf.c:238
tta_write_header
static int tta_write_header(AVFormatContext *s)
Definition: ttaenc.c:69
TTAMuxContext::seek_table
AVIOContext * seek_table
Definition: ttaenc.c:31
write_trailer
static int write_trailer(AVFormatContext *s1)
Definition: v4l2enc.c:94
AVOutputFormat::name
const char * name
Definition: avformat.h:507
AVFormatContext::pb
AVIOContext * pb
I/O context.
Definition: avformat.h:1384
av_packet_unref
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:592
TTAMuxContext::nb_samples
uint32_t nb_samples
Definition: ttaenc.c:33
ff_ape_write_tag
int ff_ape_write_tag(AVFormatContext *s)
Write an APE tag into a file.
Definition: apetag.c:185
AV_CODEC_ID_TTA
Definition: avcodec.h:573
ffio_get_checksum
unsigned long ffio_get_checksum(AVIOContext *s)
Definition: aviobuf.c:619
AVCodecParameters::bits_per_raw_sample
int bits_per_raw_sample
This is the number of valid bits in each output sample.
Definition: avcodec.h:3939
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: avcodec.h:3994
ff_packet_list_get
int ff_packet_list_get(AVPacketList **head, AVPacketList **tail, AVPacket *pkt)
Remove the oldest AVPacket in the list and return it.
Definition: utils.c:1549
avformat.h
Main libavformat public API header.
av_free
#define av_free(p)
Definition: tableprint_vlc.h:34
AVFormatContext::priv_data
void * priv_data
Format private data.
Definition: avformat.h:1370
write_header
static void write_header(FFV1Context *f)
Definition: ffv1enc.c:337
TTAMuxContext::last_frame
int last_frame
Definition: ttaenc.c:35
AVCodecParameters::extradata
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:3898
AVCodecParameters::channels
int channels
Audio only.
Definition: avcodec.h:3990
TTAMuxContext::frame_size
int frame_size
Definition: ttaenc.c:34
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1020
AVPacket
This structure stores compressed data.
Definition: avcodec.h:1407
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