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In ogg muxer, use dyn buffer to compute crc of the page, fix muxing with pipe

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when page buffer is bigger than default buffer size. Max page is 65k.

Originally committed as revision 24242 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Baptiste Coudurier 2010-07-14 23:21:18 +00:00
parent 4563de772c
commit 22fe18c1c0
1 changed files with 34 additions and 20 deletions
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54
libavformat/oggenc.c
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@ -63,36 +63,50 @@ typedef struct {
OGGPageList *page_list;
} OGGContext;
static void ogg_update_checksum(AVFormatContext *s, int64_t crc_offset)
static void ogg_update_checksum(AVFormatContext *s, ByteIOContext *pb, int64_t crc_offset)
{
int64_t pos = url_ftell(s->pb);
uint32_t checksum = get_checksum(s->pb);
url_fseek(s->pb, crc_offset, SEEK_SET);
put_be32(s->pb, checksum);
url_fseek(s->pb, pos, SEEK_SET);
int64_t pos = url_ftell(pb);
uint32_t checksum = get_checksum(pb);
url_fseek(pb, crc_offset, SEEK_SET);
put_be32(pb, checksum);
url_fseek(pb, pos, SEEK_SET);
}
static void ogg_write_page(AVFormatContext *s, OGGPage *page, int extra_flags)
static int ogg_write_page(AVFormatContext *s, OGGPage *page, int extra_flags)
{
OGGStreamContext *oggstream = s->streams[page->stream_index]->priv_data;
ByteIOContext *pb;
int64_t crc_offset;
int ret, size;
uint8_t *buf;
init_checksum(s->pb, ff_crc04C11DB7_update, 0);
put_tag(s->pb, "OggS");
put_byte(s->pb, 0);
put_byte(s->pb, page->flags | extra_flags);
put_le64(s->pb, page->granule);
put_le32(s->pb, oggstream->serial_num);
put_le32(s->pb, oggstream->page_counter++);
crc_offset = url_ftell(s->pb);
put_le32(s->pb, 0); // crc
put_byte(s->pb, page->segments_count);
put_buffer(s->pb, page->segments, page->segments_count);
put_buffer(s->pb, page->data, page->size);
ret = url_open_dyn_buf(&pb);
if (ret < 0)
return ret;
init_checksum(pb, ff_crc04C11DB7_update, 0);
put_tag(pb, "OggS");
put_byte(pb, 0);
put_byte(pb, page->flags | extra_flags);
put_le64(pb, page->granule);
put_le32(pb, oggstream->serial_num);
put_le32(pb, oggstream->page_counter++);
crc_offset = url_ftell(pb);
put_le32(pb, 0); // crc
put_byte(pb, page->segments_count);
put_buffer(pb, page->segments, page->segments_count);
put_buffer(pb, page->data, page->size);
ogg_update_checksum(s, crc_offset);
ogg_update_checksum(s, pb, crc_offset);
put_flush_packet(pb);
size = url_close_dyn_buf(pb, &buf);
if (size < 0)
return size;
put_buffer(s->pb, buf, size);
put_flush_packet(s->pb);
oggstream->page_count--;
return 0;
}
static int64_t ogg_granule_to_timestamp(OGGStreamContext *oggstream, OGGPage *page)