FFmpeg
wvenc.c
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1 /*
2  * WavPack muxer
3  * Copyright (c) 2013 Konstantin Shishkov <kostya.shishkov@gmail.com>
4  * Copyright (c) 2012 Paul B Mahol
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #include "libavutil/attributes.h"
24 
25 #include "apetag.h"
26 #include "avformat.h"
27 #include "wv.h"
28 
29 typedef struct WvMuxContext {
30  int64_t samples;
31 } WvMuxContext;
32 
34 {
35  if (ctx->nb_streams > 1 ||
37  av_log(ctx, AV_LOG_ERROR, "This muxer only supports a single WavPack stream.\n");
38  return AVERROR(EINVAL);
39  }
40 
41  return 0;
42 }
43 
45 {
46  WvMuxContext *s = ctx->priv_data;
48  int ret;
49 
50  if (pkt->size < WV_HEADER_SIZE ||
51  (ret = ff_wv_parse_header(&header, pkt->data)) < 0) {
52  av_log(ctx, AV_LOG_ERROR, "Invalid WavPack packet.\n");
53  return AVERROR(EINVAL);
54  }
55  s->samples += header.samples;
56 
57  avio_write(ctx->pb, pkt->data, pkt->size);
58 
59  return 0;
60 }
61 
63 {
64  WvMuxContext *s = ctx->priv_data;
65 
66  /* update total number of samples in the first block */
67  if ((ctx->pb->seekable & AVIO_SEEKABLE_NORMAL) && s->samples &&
68  s->samples < UINT32_MAX) {
69  int64_t pos = avio_tell(ctx->pb);
70  avio_seek(ctx->pb, 12, SEEK_SET);
71  avio_wl32(ctx->pb, s->samples);
72  avio_seek(ctx->pb, pos, SEEK_SET);
73  }
74 
75  ff_ape_write_tag(ctx);
76  return 0;
77 }
78 
80  .name = "wv",
81  .long_name = NULL_IF_CONFIG_SMALL("raw WavPack"),
82  .mime_type = "audio/x-wavpack",
83  .extensions = "wv",
84  .priv_data_size = sizeof(WvMuxContext),
85  .audio_codec = AV_CODEC_ID_WAVPACK,
86  .video_codec = AV_CODEC_ID_NONE,
91 };
static void write_packet(OutputFile *of, AVPacket *pkt, OutputStream *ost, int unqueue)
Definition: ffmpeg.c:689
uint32_t samples
Definition: wv.h:39
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3968
int size
Definition: avcodec.h:1481
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:246
static AVPacket pkt
Macro definitions for various function/variable attributes.
Format I/O context.
Definition: avformat.h:1358
void avio_wl32(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:372
#define av_cold
Definition: attributes.h:82
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1426
uint8_t * data
Definition: avcodec.h:1480
#define WV_HEADER_SIZE
Definition: wavpack.h:30
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
static const uint8_t header[24]
Definition: sdr2.c:67
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:218
Definition: wv.h:34
#define av_log(a,...)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
static av_cold int wv_write_header(AVFormatContext *ctx)
Definition: wvenc.c:33
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1414
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:260
static int write_trailer(AVFormatContext *s1)
Definition: v4l2enc.c:94
int ff_wv_parse_header(WvHeader *wv, const uint8_t *data)
Parse a WavPack block header.
Definition: wv.c:29
const char * name
Definition: avformat.h:505
AVFormatContext * ctx
Definition: movenc.c:48
#define s(width, name)
Definition: cbs_vp9.c:257
#define AVFMT_NOTIMESTAMPS
Format does not need / have any timestamps.
Definition: avformat.h:467
#define AVIO_SEEKABLE_NORMAL
Seeking works like for a local file.
Definition: avio.h:40
static av_cold int wv_write_trailer(AVFormatContext *ctx)
Definition: wvenc.c:62
AVIOContext * pb
I/O context.
Definition: avformat.h:1400
int64_t samples
Definition: wvenc.c:30
AVOutputFormat ff_wv_muxer
Definition: wvenc.c:79
int ff_ape_write_tag(AVFormatContext *s)
Write an APE tag into a file.
Definition: apetag.c:185
#define flags(name, subs,...)
Definition: cbs_av1.c:561
static int wv_write_packet(AVFormatContext *ctx, AVPacket *pkt)
Definition: wvenc.c:44
Main libavformat public API header.
void * priv_data
Format private data.
Definition: avformat.h:1386
static void write_header(FFV1Context *f)
Definition: ffv1enc.c:349
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1028
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
This structure stores compressed data.
Definition: avcodec.h:1457