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 
26 #include "apetag.h"
27 #include "avformat.h"
28 #include "avio_internal.h"
29 #include "internal.h"
30 
31 typedef struct TTAMuxContext {
34  uint32_t nb_samples;
38 
40 {
41  TTAMuxContext *tta = s->priv_data;
42  AVCodecParameters *par;
43 
44  if (s->nb_streams != 1) {
45  av_log(s, AV_LOG_ERROR, "Only one stream is supported\n");
46  return AVERROR(EINVAL);
47  }
48  par = s->streams[0]->codecpar;
49 
50  if (par->codec_id != AV_CODEC_ID_TTA) {
51  av_log(s, AV_LOG_ERROR, "Unsupported codec\n");
52  return AVERROR(EINVAL);
53  }
54  if (par->extradata && par->extradata_size < 22) {
55  av_log(s, AV_LOG_ERROR, "Invalid TTA extradata\n");
56  return AVERROR_INVALIDDATA;
57  }
58 
59  /* Prevent overflow */
60  if (par->sample_rate > 0x7FFFFFu) {
61  av_log(s, AV_LOG_ERROR, "Sample rate too large\n");
62  return AVERROR(EINVAL);
63  }
64  tta->frame_size = par->sample_rate * 256 / 245;
65  avpriv_set_pts_info(s->streams[0], 64, 1, par->sample_rate);
66 
67  return 0;
68 }
69 
71 {
72  TTAMuxContext *tta = s->priv_data;
73  AVCodecParameters *par = s->streams[0]->codecpar;
74  int ret;
75 
76  if ((ret = avio_open_dyn_buf(&tta->seek_table)) < 0)
77  return ret;
78 
79  /* Ignore most extradata information if present. It can be innacurate
80  if for example remuxing from Matroska */
81  ffio_init_checksum(s->pb, ff_crcEDB88320_update, UINT32_MAX);
83  avio_write(s->pb, "TTA1", 4);
84  avio_wl16(s->pb, par->extradata ? AV_RL16(par->extradata + 4) : 1);
85  avio_wl16(s->pb, par->channels);
86  avio_wl16(s->pb, par->bits_per_raw_sample);
87  avio_wl32(s->pb, par->sample_rate);
88 
89  return 0;
90 }
91 
93 {
94  TTAMuxContext *tta = s->priv_data;
95  int ret;
96 
98  av_packet_ref, 0);
99  if (ret < 0) {
100  return ret;
101  }
102 
103  avio_wl32(tta->seek_table, pkt->size);
104  tta->nb_samples += pkt->duration;
105 
106  if (tta->frame_size != pkt->duration) {
107  if (tta->last_frame) {
108  /* Two frames with a different duration than the default frame
109  size means the TTA stream comes from a faulty container, and
110  there's no way the last frame duration will be correct. */
111  av_log(s, AV_LOG_ERROR, "Invalid frame durations\n");
112 
113  return AVERROR_INVALIDDATA;
114  }
115  /* First frame with a different duration than the default frame size.
116  Assume it's the last frame in the stream and continue. */
117  tta->last_frame++;
118  }
119 
120  return 0;
121 }
122 
124 {
125  TTAMuxContext *tta = s->priv_data;
126  AVPacket pkt;
127 
128  while (tta->queue) {
129  avpriv_packet_list_get(&tta->queue, &tta->queue_end, &pkt);
130  avio_write(s->pb, pkt.data, pkt.size);
132  }
133 }
134 
136 {
137  TTAMuxContext *tta = s->priv_data;
138  uint8_t *ptr;
139  unsigned int crc;
140  int size;
141 
142  avio_wl32(s->pb, tta->nb_samples);
143  crc = ffio_get_checksum(s->pb) ^ UINT32_MAX;
144  avio_wl32(s->pb, crc);
145 
146  /* Write Seek table */
147  crc = ffio_get_checksum(tta->seek_table) ^ UINT32_MAX;
148  avio_wl32(tta->seek_table, crc);
149  size = avio_get_dyn_buf(tta->seek_table, &ptr);
150  avio_write(s->pb, ptr, size);
151 
152  /* Write audio data */
154 
156 
157  return 0;
158 }
159 
161 {
162  TTAMuxContext *tta = s->priv_data;
163 
166 }
167 
169  .name = "tta",
170  .long_name = NULL_IF_CONFIG_SMALL("TTA (True Audio)"),
171  .mime_type = "audio/x-tta",
172  .extensions = "tta",
173  .priv_data_size = sizeof(TTAMuxContext),
174  .audio_codec = AV_CODEC_ID_TTA,
175  .video_codec = AV_CODEC_ID_NONE,
176  .init = tta_init,
177  .deinit = tta_deinit,
181 };
av_packet_unref
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:417
TTAMuxContext::frame_size
int frame_size
Definition: ttaenc.c:35
AVCodecParameters::extradata
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:74
init
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:31
AVOutputFormat::name
const char * name
Definition: avformat.h:496
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
tta_queue_flush
static void tta_queue_flush(AVFormatContext *s)
Definition: ttaenc.c:123
AVCodecParameters
This struct describes the properties of an encoded stream.
Definition: codec_par.h:52
apetag.h
AVPacket::data
uint8_t * data
Definition: packet.h:373
PacketList
Definition: packet_internal.h:26
TTAMuxContext::seek_table
AVIOContext * seek_table
Definition: ttaenc.c:32
AVPacket::duration
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: packet.h:391
avio_get_dyn_buf
int avio_get_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
Return the written size and a pointer to the buffer.
Definition: aviobuf.c:1411
ffio_get_checksum
unsigned long ffio_get_checksum(AVIOContext *s)
Definition: aviobuf.c:596
tta_deinit
static void tta_deinit(AVFormatContext *s)
Definition: ttaenc.c:160
crc.h
avio_wl16
void avio_wl16(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:451
AVCodecParameters::channels
int channels
Audio only.
Definition: codec_par.h:166
AVCodecParameters::bits_per_raw_sample
int bits_per_raw_sample
This is the number of valid bits in each output sample.
Definition: codec_par.h:115
TTAMuxContext::queue
PacketList * queue
Definition: ttaenc.c:33
tta_init
static int tta_init(AVFormatContext *s)
Definition: ttaenc.c:39
tta_write_header
static int tta_write_header(AVFormatContext *s)
Definition: ttaenc.c:70
ff_tta_muxer
const AVOutputFormat ff_tta_muxer
Definition: ttaenc.c:168
pkt
AVPacket * pkt
Definition: movenc.c:59
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
AV_CODEC_ID_TTA
@ AV_CODEC_ID_TTA
Definition: codec_id.h:444
avio_open_dyn_buf
int avio_open_dyn_buf(AVIOContext **s)
Open a write only memory stream.
Definition: aviobuf.c:1399
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:257
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:94
ff_crcEDB88320_update
unsigned long ff_crcEDB88320_update(unsigned long checksum, const uint8_t *buf, unsigned int len)
Definition: aviobuf.c:584
ff_ape_write_tag
int ff_ape_write_tag(AVFormatContext *s)
Write an APE tag into a file.
Definition: apetag.c:175
AVFormatContext
Format I/O context.
Definition: avformat.h:1097
internal.h
write_trailer
static int write_trailer(AVFormatContext *s1)
Definition: v4l2enc.c:98
av_packet_ref
int av_packet_ref(AVPacket *dst, const AVPacket *src)
Setup a new reference to the data described by a given packet.
Definition: avpacket.c:425
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:170
AVCodecParameters::extradata_size
int extradata_size
Size of the extradata content in bytes.
Definition: codec_par.h:78
AVIOContext
Bytestream IO Context.
Definition: avio.h:161
TTAMuxContext::nb_samples
uint32_t nb_samples
Definition: ttaenc.c:34
AVPacket::size
int size
Definition: packet.h:374
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:117
size
int size
Definition: twinvq_data.h:10344
tta_write_packet
static int tta_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: ttaenc.c:92
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:604
tta_write_trailer
static int tta_write_trailer(AVFormatContext *s)
Definition: ttaenc.c:135
avio_write
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:218
avio_wl32
void avio_wl32(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:371
write_packet
static void write_packet(OutputFile *of, AVPacket *pkt, OutputStream *ost, int unqueue)
Definition: ffmpeg.c:731
AV_CODEC_ID_NONE
@ AV_CODEC_ID_NONE
Definition: codec_id.h:48
AVOutputFormat
Definition: avformat.h:495
avio_internal.h
ffio_free_dyn_buf
void ffio_free_dyn_buf(AVIOContext **s)
Free a dynamic buffer.
Definition: aviobuf.c:1472
ret
ret
Definition: filter_design.txt:187
avpriv_packet_list_get
int avpriv_packet_list_get(PacketList **pkt_buffer, PacketList **pkt_buffer_end, AVPacket *pkt)
Remove the oldest AVPacket in the list and return it.
Definition: avpacket.c:571
avformat.h
avpriv_set_pts_info
void avpriv_set_pts_info(AVStream *st, 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:1146
TTAMuxContext
Definition: ttaenc.c:31
packet_internal.h
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
AVPacket
This structure stores compressed data.
Definition: packet.h:350
TTAMuxContext::last_frame
int last_frame
Definition: ttaenc.c:36
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
write_header
static void write_header(FFV1Context *f)
Definition: ffv1enc.c:347
avpriv_packet_list_put
int avpriv_packet_list_put(PacketList **packet_buffer, PacketList **plast_pktl, AVPacket *pkt, int(*copy)(AVPacket *dst, const AVPacket *src), int flags)
Append an AVPacket to the list.
Definition: avpacket.c:531
avpriv_packet_list_free
void avpriv_packet_list_free(PacketList **pkt_buf, PacketList **pkt_buf_end)
Wipe the list and unref all the packets in it.
Definition: avpacket.c:587
TTAMuxContext::queue_end
PacketList * queue_end
Definition: ttaenc.c:33