mirror of
https://git.videolan.org/git/ffmpeg.git
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215 lines
6.7 KiB
C
215 lines
6.7 KiB
C
/*
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* raw FLAC muxer
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* Copyright (c) 2006-2009 Justin Ruggles
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/channel_layout.h"
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#include "libavutil/opt.h"
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#include "libavcodec/flac.h"
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#include "avformat.h"
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#include "avio_internal.h"
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#include "flacenc.h"
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#include "vorbiscomment.h"
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#include "libavcodec/bytestream.h"
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typedef struct FlacMuxerContext {
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const AVClass *class;
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int write_header;
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/* updated streaminfo sent by the encoder at the end */
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uint8_t *streaminfo;
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} FlacMuxerContext;
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static int flac_write_block_padding(AVIOContext *pb, unsigned int n_padding_bytes,
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int last_block)
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{
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avio_w8(pb, last_block ? 0x81 : 0x01);
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avio_wb24(pb, n_padding_bytes);
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ffio_fill(pb, 0, n_padding_bytes);
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return 0;
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}
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static int flac_write_block_comment(AVIOContext *pb, AVDictionary **m,
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int last_block, int bitexact)
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{
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const char *vendor = bitexact ? "ffmpeg" : LIBAVFORMAT_IDENT;
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int64_t len;
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uint8_t *p, *p0;
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ff_metadata_conv(m, ff_vorbiscomment_metadata_conv, NULL);
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len = ff_vorbiscomment_length(*m, vendor);
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if (len >= ((1<<24) - 4))
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return AVERROR(EINVAL);
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p0 = av_malloc(len+4);
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if (!p0)
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return AVERROR(ENOMEM);
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p = p0;
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bytestream_put_byte(&p, last_block ? 0x84 : 0x04);
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bytestream_put_be24(&p, len);
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ff_vorbiscomment_write(&p, m, vendor);
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avio_write(pb, p0, len+4);
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av_freep(&p0);
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p = NULL;
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return 0;
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}
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static int flac_write_header(struct AVFormatContext *s)
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{
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int ret;
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int padding = s->metadata_header_padding;
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AVCodecContext *codec = s->streams[0]->codec;
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FlacMuxerContext *c = s->priv_data;
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if (!c->write_header)
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return 0;
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if (s->nb_streams > 1) {
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av_log(s, AV_LOG_ERROR, "only one stream is supported\n");
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return AVERROR(EINVAL);
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}
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if (codec->codec_id != AV_CODEC_ID_FLAC) {
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av_log(s, AV_LOG_ERROR, "unsupported codec\n");
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return AVERROR(EINVAL);
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}
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if (padding < 0)
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padding = 8192;
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/* The FLAC specification states that 24 bits are used to represent the
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* size of a metadata block so we must clip this value to 2^24-1. */
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padding = av_clip_uintp2(padding, 24);
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ret = ff_flac_write_header(s->pb, codec->extradata,
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codec->extradata_size, 0);
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if (ret)
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return ret;
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/* add the channel layout tag */
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if (codec->channel_layout &&
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!(codec->channel_layout & ~0x3ffffULL) &&
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!ff_flac_is_native_layout(codec->channel_layout)) {
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AVDictionaryEntry *chmask = av_dict_get(s->metadata, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK",
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NULL, 0);
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if (chmask) {
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av_log(s, AV_LOG_WARNING, "A WAVEFORMATEXTENSIBLE_CHANNEL_MASK is "
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"already present, this muxer will not overwrite it.\n");
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} else {
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uint8_t buf[32];
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snprintf(buf, sizeof(buf), "0x%"PRIx64, codec->channel_layout);
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av_dict_set(&s->metadata, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", buf, 0);
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}
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}
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ret = flac_write_block_comment(s->pb, &s->metadata, !padding,
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s->flags & AVFMT_FLAG_BITEXACT);
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if (ret)
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return ret;
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/* The command line flac encoder defaults to placing a seekpoint
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* every 10s. So one might add padding to allow that later
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* but there seems to be no simple way to get the duration here.
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* So just add the amount requested by the user. */
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if (padding)
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flac_write_block_padding(s->pb, padding, 1);
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return ret;
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}
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static int flac_write_trailer(struct AVFormatContext *s)
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{
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AVIOContext *pb = s->pb;
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int64_t file_size;
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FlacMuxerContext *c = s->priv_data;
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uint8_t *streaminfo = c->streaminfo ? c->streaminfo :
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s->streams[0]->codec->extradata;
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if (!c->write_header || !streaminfo)
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return 0;
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if (pb->seekable) {
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/* rewrite the STREAMINFO header block data */
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file_size = avio_tell(pb);
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avio_seek(pb, 8, SEEK_SET);
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avio_write(pb, streaminfo, FLAC_STREAMINFO_SIZE);
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avio_seek(pb, file_size, SEEK_SET);
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avio_flush(pb);
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} else {
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av_log(s, AV_LOG_WARNING, "unable to rewrite FLAC header.\n");
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}
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av_freep(&c->streaminfo);
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return 0;
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}
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static int flac_write_packet(struct AVFormatContext *s, AVPacket *pkt)
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{
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FlacMuxerContext *c = s->priv_data;
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uint8_t *streaminfo;
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int streaminfo_size;
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/* check for updated streaminfo */
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streaminfo = av_packet_get_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
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&streaminfo_size);
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if (streaminfo && streaminfo_size == FLAC_STREAMINFO_SIZE) {
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av_freep(&c->streaminfo);
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c->streaminfo = av_malloc(FLAC_STREAMINFO_SIZE);
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if (!c->streaminfo)
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return AVERROR(ENOMEM);
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memcpy(c->streaminfo, streaminfo, FLAC_STREAMINFO_SIZE);
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}
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if (pkt->size)
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avio_write(s->pb, pkt->data, pkt->size);
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return 0;
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}
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static const AVOption flacenc_options[] = {
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{ "write_header", "Write the file header", offsetof(FlacMuxerContext, write_header), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM },
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{ NULL },
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};
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static const AVClass flac_muxer_class = {
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.class_name = "flac muxer",
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.item_name = av_default_item_name,
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.option = flacenc_options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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AVOutputFormat ff_flac_muxer = {
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.name = "flac",
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.long_name = NULL_IF_CONFIG_SMALL("raw FLAC"),
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.priv_data_size = sizeof(FlacMuxerContext),
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.mime_type = "audio/x-flac",
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.extensions = "flac",
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.audio_codec = AV_CODEC_ID_FLAC,
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.video_codec = AV_CODEC_ID_NONE,
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.write_header = flac_write_header,
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.write_packet = flac_write_packet,
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.write_trailer = flac_write_trailer,
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.flags = AVFMT_NOTIMESTAMPS,
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.priv_class = &flac_muxer_class,
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};
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