* raw FLAC muxer
* Copyright (c) 2006-2009 Justin Ruggles
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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,
+ * Libav 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
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
+#include "libavcodec/flac.h"
#include "avformat.h"
+#include "flacenc.h"
+#include "vorbiscomment.h"
+#include "libavcodec/bytestream.h"
-static int flac_write_header(struct AVFormatContext *s)
+
+static int flac_write_block_padding(AVIOContext *pb, unsigned int n_padding_bytes,
+ int last_block)
{
- static const uint8_t header[8] = {
- 0x66, 0x4C, 0x61, 0x43, 0x80, 0x00, 0x00, 0x22
- };
- uint8_t *streaminfo = s->streams[0]->codec->extradata;
- int len = s->streams[0]->codec->extradata_size;
- if(streaminfo != NULL && len > 0) {
- put_buffer(s->pb, header, 8);
- put_buffer(s->pb, streaminfo, len);
+ avio_w8(pb, last_block ? 0x81 : 0x01);
+ avio_wb24(pb, n_padding_bytes);
+ while (n_padding_bytes > 0) {
+ avio_w8(pb, 0);
+ n_padding_bytes--;
}
return 0;
}
+static int flac_write_block_comment(AVIOContext *pb, AVDictionary **m,
+ int last_block, int bitexact)
+{
+ const char *vendor = bitexact ? "ffmpeg" : LIBAVFORMAT_IDENT;
+ unsigned int len, count;
+ uint8_t *p, *p0;
+
+ ff_metadata_conv(m, ff_vorbiscomment_metadata_conv, NULL);
+
+ len = ff_vorbiscomment_length(*m, vendor, &count);
+ p0 = av_malloc(len+4);
+ if (!p0)
+ return AVERROR(ENOMEM);
+ p = p0;
+
+ bytestream_put_byte(&p, last_block ? 0x84 : 0x04);
+ bytestream_put_be24(&p, len);
+ ff_vorbiscomment_write(&p, m, vendor, count);
+
+ avio_write(pb, p0, len+4);
+ av_freep(&p0);
+ p = NULL;
+
+ return 0;
+}
+
+static int flac_write_header(struct AVFormatContext *s)
+{
+ int ret;
+ AVCodecContext *codec = s->streams[0]->codec;
+
+ ret = ff_flac_write_header(s->pb, codec, 0);
+ if (ret)
+ return ret;
+
+ ret = flac_write_block_comment(s->pb, &s->metadata, 0,
+ codec->flags & CODEC_FLAG_BITEXACT);
+ if (ret)
+ return ret;
+
+ /* The command line flac encoder defaults to placing a seekpoint
+ * every 10s. So one might add padding to allow that later
+ * but there seems to be no simple way to get the duration here.
+ * So let's try the flac default of 8192 bytes */
+ flac_write_block_padding(s->pb, 8192, 1);
+
+ return ret;
+}
+
static int flac_write_trailer(struct AVFormatContext *s)
{
- ByteIOContext *pb = s->pb;
- uint8_t *streaminfo = s->streams[0]->codec->extradata;
- int len = s->streams[0]->codec->extradata_size;
+ AVIOContext *pb = s->pb;
+ uint8_t *streaminfo;
+ enum FLACExtradataFormat format;
int64_t file_size;
- if (streaminfo && len > 0 && !url_is_streamed(s->pb)) {
- file_size = url_ftell(pb);
- url_fseek(pb, 8, SEEK_SET);
- put_buffer(pb, streaminfo, len);
- url_fseek(pb, file_size, SEEK_SET);
- put_flush_packet(pb);
+ if (!ff_flac_is_extradata_valid(s->streams[0]->codec, &format, &streaminfo))
+ return -1;
+
+ if (pb->seekable) {
+ /* rewrite the STREAMINFO header block data */
+ file_size = avio_tell(pb);
+ avio_seek(pb, 8, SEEK_SET);
+ avio_write(pb, streaminfo, FLAC_STREAMINFO_SIZE);
+ avio_seek(pb, file_size, SEEK_SET);
+ avio_flush(pb);
+ } else {
+ av_log(s, AV_LOG_WARNING, "unable to rewrite FLAC header.\n");
}
return 0;
}
static int flac_write_packet(struct AVFormatContext *s, AVPacket *pkt)
{
- put_buffer(s->pb, pkt->data, pkt->size);
- put_flush_packet(s->pb);
+ avio_write(s->pb, pkt->data, pkt->size);
+ avio_flush(s->pb);
return 0;
}
-AVOutputFormat flac_muxer = {
- "flac",
- NULL_IF_CONFIG_SMALL("raw FLAC"),
- "audio/x-flac",
- "flac",
- 0,
- CODEC_ID_FLAC,
- CODEC_ID_NONE,
- flac_write_header,
- flac_write_packet,
- flac_write_trailer,
+AVOutputFormat ff_flac_muxer = {
+ .name = "flac",
+ .long_name = NULL_IF_CONFIG_SMALL("raw FLAC"),
+ .mime_type = "audio/x-flac",
+ .extensions = "flac",
+ .audio_codec = CODEC_ID_FLAC,
+ .video_codec = CODEC_ID_NONE,
+ .write_header = flac_write_header,
+ .write_packet = flac_write_packet,
+ .write_trailer = flac_write_trailer,
.flags= AVFMT_NOTIMESTAMPS,
};