diff options
| -rw-r--r-- | libavformat/oggenc.c | 62 |
1 files changed, 22 insertions, 40 deletions
diff --git a/libavformat/oggenc.c b/libavformat/oggenc.c index 3aff3c7a08..f5032759a6 100644 --- a/libavformat/oggenc.c +++ b/libavformat/oggenc.c @@ -99,50 +99,32 @@ static const AVClass flavor ## _muxer_class = {\ .version = LIBAVUTIL_VERSION_INT,\ }; -static void ogg_update_checksum(AVFormatContext *s, AVIOContext *pb, int64_t crc_offset) -{ - int64_t pos = avio_tell(pb); - uint32_t checksum = ffio_get_checksum(pb); - avio_seek(pb, crc_offset, SEEK_SET); - avio_wb32(pb, checksum); - avio_seek(pb, pos, SEEK_SET); -} - -static int ogg_write_page(AVFormatContext *s, OGGPage *page, int extra_flags) +static void ogg_write_page(AVFormatContext *s, OGGPage *page, int extra_flags) { OGGStreamContext *oggstream = s->streams[page->stream_index]->priv_data; - AVIOContext *pb; - int64_t crc_offset; - int ret, size; - uint8_t *buf; - - ret = avio_open_dyn_buf(&pb); - if (ret < 0) - return ret; - ffio_init_checksum(pb, ff_crc04C11DB7_update, 0); - ffio_wfourcc(pb, "OggS"); - avio_w8(pb, 0); - avio_w8(pb, page->flags | extra_flags); - avio_wl64(pb, page->granule); - avio_wl32(pb, oggstream->serial_num); - avio_wl32(pb, oggstream->page_counter++); - crc_offset = avio_tell(pb); - avio_wl32(pb, 0); // crc - avio_w8(pb, page->segments_count); - avio_write(pb, page->segments, page->segments_count); - avio_write(pb, page->data, page->size); - - ogg_update_checksum(s, pb, crc_offset); - - size = avio_close_dyn_buf(pb, &buf); - if (size < 0) - return size; - - avio_write(s->pb, buf, size); + uint8_t buf[4 + 1 + 1 + 8 + 4 + 4 + 4 + 1 + 255], *ptr = buf, *crc_pos; + const AVCRC *crc_table = av_crc_get_table(AV_CRC_32_IEEE); + uint32_t crc; + + bytestream_put_le32(&ptr, MKTAG('O', 'g', 'g', 'S')); + bytestream_put_byte(&ptr, 0); + bytestream_put_byte(&ptr, page->flags | extra_flags); + bytestream_put_le64(&ptr, page->granule); + bytestream_put_le32(&ptr, oggstream->serial_num); + bytestream_put_le32(&ptr, oggstream->page_counter++); + crc_pos = ptr; + bytestream_put_le32(&ptr, 0); + bytestream_put_byte(&ptr, page->segments_count); + bytestream_put_buffer(&ptr, page->segments, page->segments_count); + + crc = av_crc(crc_table, 0, buf, ptr - buf); + crc = av_crc(crc_table, crc, page->data, page->size); + bytestream_put_be32(&crc_pos, crc); + + avio_write(s->pb, buf, ptr - buf); + avio_write(s->pb, page->data, page->size); avio_write_marker(s->pb, AV_NOPTS_VALUE, AVIO_DATA_MARKER_FLUSH_POINT); - av_free(buf); oggstream->page_count--; - return 0; } static int ogg_key_granule(OGGStreamContext *oggstream, int64_t granule) |