static av_cold int flac_decode_init(AVCodecContext *avctx)
{
enum FLACExtradataFormat format;
uint8_t *streaminfo;
int ret;
FLACContext *s = avctx->priv_data;
s->avctx = avctx;
/* for now, the raw FLAC header is allowed to be passed to the decoder as
frame data instead of extradata. */
if (!avctx->extradata)
return 0;
if (!avpriv_flac_is_extradata_valid(avctx, &format, &streaminfo))
return -1;
/* initialize based on the demuxer-supplied streamdata header */
avpriv_flac_parse_streaminfo(avctx, (FLACStreaminfo *)s, streaminfo);
ret = allocate_buffers(s);
if (ret < 0)
return ret;
flac_set_bps(s);
ff_flacdsp_init(&s->dsp, avctx->sample_fmt, s->bps);
s->got_streaminfo = 1;
avcodec_get_frame_defaults(&s->frame);
avctx->coded_frame = &s->frame;
return 0;
}
static av_cold int flac_decode_init(AVCodecContext *avctx)
{
enum FLACExtradataFormat format;
uint8_t *streaminfo;
FLACContext *s = avctx->priv_data;
s->avctx = avctx;
/* for now, the raw FLAC header is allowed to be passed to the decoder as
frame data instead of extradata. */
if (!avctx->extradata)
return 0;
if (!avpriv_flac_is_extradata_valid(avctx, &format, &streaminfo))
return -1;
/* initialize based on the demuxer-supplied streamdata header */
avpriv_flac_parse_streaminfo(avctx, (FLACStreaminfo *)s, streaminfo);
if (s->bps > 16)
avctx->sample_fmt = AV_SAMPLE_FMT_S32;
else
avctx->sample_fmt = AV_SAMPLE_FMT_S16;
allocate_buffers(s);
s->got_streaminfo = 1;
avcodec_get_frame_defaults(&s->frame);
avctx->coded_frame = &s->frame;
if (avctx->channels <= FF_ARRAY_ELEMS(flac_channel_layouts))
avctx->channel_layout = flac_channel_layouts[avctx->channels - 1];
return 0;
}
static int flac_write_trailer(struct AVFormatContext *s)
{
AVIOContext *pb = s->pb;
uint8_t *streaminfo;
enum FLACExtradataFormat format;
int64_t file_size;
FlacMuxerContext *c = s->priv_data;
if (!c->write_header)
return 0;
if (!avpriv_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;
}
int ff_flac_write_header(AVIOContext *pb, AVCodecContext *codec,
int last_block)
{
uint8_t header[8] = {
0x66, 0x4C, 0x61, 0x43, 0x00, 0x00, 0x00, 0x22
};
uint8_t *streaminfo;
enum FLACExtradataFormat format;
header[4] = last_block ? 0x80 : 0x00;
if (!avpriv_flac_is_extradata_valid(codec, &format, &streaminfo))
return -1;
/* write "fLaC" stream marker and first metadata block header */
avio_write(pb, header, 8);
/* write STREAMINFO */
avio_write(pb, streaminfo, FLAC_STREAMINFO_SIZE);
return 0;
}