FFmpeg: libavformat/wvenc.c Source File

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libavformat

wvenc.c

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1 /*

2 * WavPack muxer

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 */

23 #include "libavutil/attributes.h"

25 #include "apetag.h"

26 #include "avformat.h"

27 #include "wv.h"

29 typedef struct WvMuxContext {

30 int64_t samples;

31 } WvMuxContext;

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 }

41 return 0;

42 }

44 static int wv_write_packet(AVFormatContext *ctx, AVPacket *pkt)

45 {

46 WvMuxContext *s = ctx->priv_data;

47 WvHeader header;

48 int ret;

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;

57 avio_write(ctx->pb, pkt->data, pkt->size);

59 return 0;

60 }

62 static av_cold int wv_write_trailer(AVFormatContext *ctx)

63 {

64 WvMuxContext *s = ctx->priv_data;

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 }

75 ff_ape_write_tag(ctx);

76 return 0;

77 }

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 };

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