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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 | ||
33 | static av_cold int wv_write_header(AVFormatContext *ctx) | |
34 | { | |
35 | if (ctx->nb_streams > 1 || | |
36 | ctx->streams[0]->codec->codec_id != AV_CODEC_ID_WAVPACK) { | |
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 | ||
44 | static int wv_write_packet(AVFormatContext *ctx, AVPacket *pkt) | |
45 | { | |
46 | WvMuxContext *s = ctx->priv_data; | |
47 | WvHeader header; | |
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 | ||
62 | static av_cold int wv_write_trailer(AVFormatContext *ctx) | |
63 | { | |
64 | WvMuxContext *s = ctx->priv_data; | |
65 | ||
66 | /* update total number of samples in the first block */ | |
67 | if (ctx->pb->seekable && 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 | ||
79 | AVOutputFormat ff_wv_muxer = { | |
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, | |
87 | .write_header = wv_write_header, | |
88 | .write_packet = wv_write_packet, | |
89 | .write_trailer = wv_write_trailer, | |
90 | .flags = AVFMT_NOTIMESTAMPS, | |
91 | }; |