ffmpeg/libavformat/wvenc.c
Clément Bœsch 7308439158 lavf: Don't explicitly flush after each written packet in muxers
Since 596e5d4783, this is not necessary anymore. It also allows to
actually disable the flushing, improving write performance (but
possibly giving worse latency in real-time streaming).

Signed-off-by: Martin Storsjö <martin@martin.st>
2013-09-16 22:17:33 +03:00

92 lines
2.7 KiB
C

/*
* WavPack muxer
* Copyright (c) 2013 Konstantin Shishkov <kostya.shishkov@gmail.com>
* Copyright (c) 2012 Paul B Mahol
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/attributes.h"
#include "apetag.h"
#include "avformat.h"
#include "wv.h"
typedef struct WvMuxContext {
int64_t samples;
} WvMuxContext;
static av_cold int wv_write_header(AVFormatContext *ctx)
{
if (ctx->nb_streams > 1 ||
ctx->streams[0]->codec->codec_id != AV_CODEC_ID_WAVPACK) {
av_log(ctx, AV_LOG_ERROR, "This muxer only supports a single WavPack stream.\n");
return AVERROR(EINVAL);
}
return 0;
}
static int wv_write_packet(AVFormatContext *ctx, AVPacket *pkt)
{
WvMuxContext *s = ctx->priv_data;
WvHeader header;
int ret;
if (pkt->size < WV_HEADER_SIZE ||
(ret = ff_wv_parse_header(&header, pkt->data)) < 0) {
av_log(ctx, AV_LOG_ERROR, "Invalid WavPack packet.\n");
return AVERROR(EINVAL);
}
s->samples += header.samples;
avio_write(ctx->pb, pkt->data, pkt->size);
return 0;
}
static av_cold int wv_write_trailer(AVFormatContext *ctx)
{
WvMuxContext *s = ctx->priv_data;
/* update total number of samples in the first block */
if (ctx->pb->seekable && s->samples &&
s->samples < UINT32_MAX) {
int64_t pos = avio_tell(ctx->pb);
avio_seek(ctx->pb, 12, SEEK_SET);
avio_wl32(ctx->pb, s->samples);
avio_seek(ctx->pb, pos, SEEK_SET);
}
ff_ape_write_tag(ctx);
return 0;
}
AVOutputFormat ff_wv_muxer = {
.name = "wv",
.long_name = NULL_IF_CONFIG_SMALL("raw WavPack"),
.mime_type = "audio/x-wavpack",
.extensions = "wv",
.priv_data_size = sizeof(WvMuxContext),
.audio_codec = AV_CODEC_ID_WAVPACK,
.video_codec = AV_CODEC_ID_NONE,
.write_header = wv_write_header,
.write_packet = wv_write_packet,
.write_trailer = wv_write_trailer,
.flags = AVFMT_NOTIMESTAMPS,
};