* 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 "libavutil/channel_layout.h"
+#include "libavutil/opt.h"
#include "libavcodec/flac.h"
#include "avformat.h"
#include "flacenc.h"
-#include "metadata.h"
#include "vorbiscomment.h"
#include "libavcodec/bytestream.h"
-static int flac_write_block_padding(ByteIOContext *pb, unsigned int n_padding_bytes,
+typedef struct FlacMuxerContext {
+ const AVClass *class;
+ int write_header;
+
+ /* updated streaminfo sent by the encoder at the end */
+ uint8_t *streaminfo;
+} FlacMuxerContext;
+
+static int flac_write_block_padding(AVIOContext *pb, unsigned int n_padding_bytes,
int last_block)
{
- put_byte(pb, last_block ? 0x81 : 0x01);
- put_be24(pb, n_padding_bytes);
+ avio_w8(pb, last_block ? 0x81 : 0x01);
+ avio_wb24(pb, n_padding_bytes);
while (n_padding_bytes > 0) {
- put_byte(pb, 0);
+ avio_w8(pb, 0);
n_padding_bytes--;
}
return 0;
}
-static int flac_write_block_comment(ByteIOContext *pb, AVMetadata **m,
+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;
+ const char *vendor = bitexact ? "Libav" : LIBAVFORMAT_IDENT;
+ unsigned int len;
uint8_t *p, *p0;
ff_metadata_conv(m, ff_vorbiscomment_metadata_conv, NULL);
- len = ff_vorbiscomment_length(*m, vendor, &count);
+ len = ff_vorbiscomment_length(*m, vendor);
p0 = av_malloc(len+4);
if (!p0)
return AVERROR(ENOMEM);
bytestream_put_byte(&p, last_block ? 0x84 : 0x04);
bytestream_put_be24(&p, len);
- ff_vorbiscomment_write(&p, m, vendor, count);
+ ff_vorbiscomment_write(&p, m, vendor);
- put_buffer(pb, p0, len+4);
+ avio_write(pb, p0, len+4);
av_freep(&p0);
p = NULL;
static int flac_write_header(struct AVFormatContext *s)
{
int ret;
- AVCodecContext *codec = s->streams[0]->codec;
+ AVCodecParameters *par = s->streams[0]->codecpar;
+ FlacMuxerContext *c = s->priv_data;
+
+ if (!c->write_header)
+ return 0;
- ret = ff_flac_write_header(s->pb, codec, 0);
+ ret = ff_flac_write_header(s->pb, par->extradata,
+ par->extradata_size, 0);
if (ret)
return ret;
+ /* add the channel layout tag */
+ if (par->channel_layout &&
+ !(par->channel_layout & ~0x3ffffULL) &&
+ !ff_flac_is_native_layout(par->channel_layout)) {
+ AVDictionaryEntry *chmask = av_dict_get(s->metadata, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK",
+ NULL, 0);
+
+ if (chmask) {
+ av_log(s, AV_LOG_WARNING, "A WAVEFORMATEXTENSIBLE_CHANNEL_MASK is "
+ "already present, this muxer will not overwrite it.\n");
+ } else {
+ uint8_t buf[32];
+ snprintf(buf, sizeof(buf), "0x%"PRIx64, par->channel_layout);
+ av_dict_set(&s->metadata, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", buf, 0);
+ }
+ }
+
ret = flac_write_block_comment(s->pb, &s->metadata, 0,
- codec->flags & CODEC_FLAG_BITEXACT);
+ s->flags & AVFMT_FLAG_BITEXACT);
if (ret)
return ret;
static int flac_write_trailer(struct AVFormatContext *s)
{
- ByteIOContext *pb = s->pb;
- uint8_t *streaminfo;
- enum FLACExtradataFormat format;
+ AVIOContext *pb = s->pb;
int64_t file_size;
+ FlacMuxerContext *c = s->priv_data;
+ uint8_t *streaminfo = c->streaminfo ? c->streaminfo :
+ s->streams[0]->codecpar->extradata;
- if (!ff_flac_is_extradata_valid(s->streams[0]->codec, &format, &streaminfo))
- return -1;
+ if (!c->write_header || !streaminfo)
+ return 0;
- if (!url_is_streamed(pb)) {
+ if (pb->seekable) {
/* rewrite the STREAMINFO header block data */
- file_size = url_ftell(pb);
- url_fseek(pb, 8, SEEK_SET);
- put_buffer(pb, streaminfo, FLAC_STREAMINFO_SIZE);
- url_fseek(pb, file_size, SEEK_SET);
- put_flush_packet(pb);
+ 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");
}
+
+ av_freep(&c->streaminfo);
+
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);
+ FlacMuxerContext *c = s->priv_data;
+ uint8_t *streaminfo;
+ int streaminfo_size;
+
+ /* check for updated streaminfo */
+ streaminfo = av_packet_get_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
+ &streaminfo_size);
+ if (streaminfo && streaminfo_size == FLAC_STREAMINFO_SIZE) {
+ av_freep(&c->streaminfo);
+
+ c->streaminfo = av_malloc(FLAC_STREAMINFO_SIZE);
+ if (!c->streaminfo)
+ return AVERROR(ENOMEM);
+ memcpy(c->streaminfo, streaminfo, FLAC_STREAMINFO_SIZE);
+ }
+
+ if (pkt->size)
+ avio_write(s->pb, pkt->data, pkt->size);
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,
- .flags= AVFMT_NOTIMESTAMPS,
+static const AVOption flacenc_options[] = {
+ { "write_header", "Write the file header", offsetof(FlacMuxerContext, write_header), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM },
+ { NULL },
+};
+
+static const AVClass flac_muxer_class = {
+ .class_name = "flac muxer",
+ .item_name = av_default_item_name,
+ .option = flacenc_options,
+ .version = LIBAVUTIL_VERSION_INT,
+};
+
+AVOutputFormat ff_flac_muxer = {
+ .name = "flac",
+ .long_name = NULL_IF_CONFIG_SMALL("raw FLAC"),
+ .priv_data_size = sizeof(FlacMuxerContext),
+ .mime_type = "audio/x-flac",
+ .extensions = "flac",
+ .audio_codec = AV_CODEC_ID_FLAC,
+ .video_codec = AV_CODEC_ID_NONE,
+ .write_header = flac_write_header,
+ .write_packet = flac_write_packet,
+ .write_trailer = flac_write_trailer,
+ .flags = AVFMT_NOTIMESTAMPS,
+ .priv_class = &flac_muxer_class,
};
projects / ffmpeg / blobdiff