Libav
wvenc.c
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1 /*
2  * This file is part of Libav.
3  *
4  * Libav is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * Libav is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with Libav; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 #include "libavutil/attributes.h"
20 
21 #include "apetag.h"
22 #include "avformat.h"
23 #include "wv.h"
24 
25 typedef struct WvMuxContext {
26  int64_t samples;
27 } WvMuxContext;
28 
30 {
31  if (ctx->nb_streams > 1 ||
33  av_log(ctx, AV_LOG_ERROR, "This muxer only supports a single WavPack stream.\n");
34  return AVERROR(EINVAL);
35  }
36 
37  return 0;
38 }
39 
41 {
42  WvMuxContext *s = ctx->priv_data;
43  WvHeader header;
44  int ret;
45 
46  if (pkt->size < WV_HEADER_SIZE ||
47  (ret = ff_wv_parse_header(&header, pkt->data)) < 0) {
48  av_log(ctx, AV_LOG_ERROR, "Invalid WavPack packet.\n");
49  return AVERROR(EINVAL);
50  }
51  s->samples += header.samples;
52 
53  avio_write(ctx->pb, pkt->data, pkt->size);
54 
55  return 0;
56 }
57 
59 {
60  WvMuxContext *s = ctx->priv_data;
61 
62  /* update total number of samples in the first block */
63  if (ctx->pb->seekable && s->samples &&
64  s->samples < UINT32_MAX) {
65  int64_t pos = avio_tell(ctx->pb);
66  avio_seek(ctx->pb, 12, SEEK_SET);
67  avio_wl32(ctx->pb, s->samples);
68  avio_seek(ctx->pb, pos, SEEK_SET);
69  }
70 
71  ff_ape_write_tag(ctx);
72  return 0;
73 }
74 
76  .name = "wv",
77  .long_name = NULL_IF_CONFIG_SMALL("raw WavPack"),
78  .mime_type = "audio/x-wavpack",
79  .extensions = "wv",
80  .priv_data_size = sizeof(WvMuxContext),
81  .audio_codec = AV_CODEC_ID_WAVPACK,
82  .video_codec = AV_CODEC_ID_NONE,
87 };