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mp3enc: drop nested structs 

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2011-04-26 03:45:48 +02:00
parent f2a90c3b34
commit 4382bc2ceb
1 changed files with 28 additions and 37 deletions
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65
libavformat/mp3enc.c
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@ -163,18 +163,13 @@ AVOutputFormat ff_mp2_muxer = {
typedef struct MP3Context {
const AVClass *class;
int id3v2_version;
struct xing_header {
int64_t offset;
int32_t frames;
int32_t size;
/* following lame's "VbrTag.c". */
struct xing_toc {
uint32_t want;
uint32_t seen;
uint32_t pos;
uint64_t bag[VBR_NUM_BAGS];
} toc;
} xing_header;
int64_t offset;
int32_t frames;
int32_t size;
uint32_t want;
uint32_t seen;
uint32_t pos;
uint64_t bag[VBR_NUM_BAGS];
} MP3Context;
static const AVOption options[] = {
@ -271,11 +266,11 @@ static int mp3_write_xing(AVFormatContext *s)
avio_wb32(s->pb, MKBETAG('X', 'i', 'n', 'g'));
avio_wb32(s->pb, 0x01 | 0x02 | 0x04); // frames/size/toc
mp3->xing_header.offset = avio_tell(s->pb);
mp3->xing_header.size = c.frame_size;
mp3->xing_header.toc.want=1;
mp3->xing_header.toc.seen=0;
mp3->xing_header.toc.pos=0;
mp3->offset = avio_tell(s->pb);
mp3->size = c.frame_size;
mp3->want=1;
mp3->seen=0;
mp3->pos=0;
avio_wb32(s->pb, 0); // frames
avio_wb32(s->pb, 0); // size
@ -297,48 +292,44 @@ static int mp3_write_xing(AVFormatContext *s)
static void mp3_xing_add_frame(AVFormatContext *s, AVPacket *pkt)
{
MP3Context *mp3 = s->priv_data;
struct xing_header *xing_header = &mp3->xing_header;
struct xing_toc *toc = &xing_header->toc;
int i;
++xing_header->frames;
xing_header->size += pkt->size;
++mp3->frames;
mp3->size += pkt->size;
if (toc->want == ++toc->seen) {
toc->bag[toc->pos] = xing_header->size;
if (mp3->want == ++mp3->seen) {
mp3->bag[mp3->pos] = mp3->size;
if (VBR_NUM_BAGS == ++toc->pos) {
if (VBR_NUM_BAGS == ++mp3->pos) {
/* shrink table to half size by throwing away each second bag. */
for (i = 1; i < VBR_NUM_BAGS; i += 2)
toc->bag[i >> 1] = toc->bag[i];
mp3->bag[i >> 1] = mp3->bag[i];
/* double wanted amount per bag. */
toc->want <<= 1;
mp3->want <<= 1;
/* adjust current position to half of table size. */
toc->pos >>= 1;
mp3->pos >>= 1;
}
toc->seen = 0;
mp3->seen = 0;
}
}
static void mp3_fix_xing(AVFormatContext *s)
{
MP3Context *mp3 = s->priv_data;
struct xing_header *xing_header = &mp3->xing_header;
struct xing_toc *toc = &xing_header->toc;
int i;
avio_flush(s->pb);
avio_seek(s->pb, xing_header->offset, SEEK_SET);
avio_wb32(s->pb, xing_header->frames);
avio_wb32(s->pb, xing_header->size);
avio_seek(s->pb, mp3->offset, SEEK_SET);
avio_wb32(s->pb, mp3->frames);
avio_wb32(s->pb, mp3->size);
avio_w8(s->pb, 0); // first toc entry has to be zero.
for (i = 1; i < VBR_TOC_SIZE; ++i) {
int j = i * toc->pos / VBR_TOC_SIZE;
int seek_point = 256LL * toc->bag[j] / xing_header->size;
int j = i * mp3->pos / VBR_TOC_SIZE;
int seek_point = 256LL * mp3->bag[j] / mp3->size;
avio_w8(s->pb, FFMIN(seek_point, 255));
}
@ -429,7 +420,7 @@ static int mp3_write_packet(AVFormatContext *s, AVPacket *pkt)
return 0;
#endif
if (0 < mp3->xing_header.offset)
if (0 < mp3->offset)
mp3_xing_add_frame(s, pkt);
return ff_raw_write_packet(s, pkt);
@ -444,7 +435,7 @@ static int mp3_write_trailer(AVFormatContext *s)
if (ret < 0)
return ret;
if (0 < mp3->xing_header.offset)
if (0 < mp3->offset)
mp3_fix_xing(s);
return 0;