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Do D10 AES3 audio conversion in-place instead of using a large on-stack buffer.

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Originally committed as revision 20567 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Reimar Döffinger 2009-11-20 23:12:55 +00:00
parent 98c82d6910
commit c7a38887c1
1 changed files with 3 additions and 4 deletions
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7
libavformat/mxfdec.c
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@ -214,18 +214,17 @@ static int mxf_get_stream_index(AVFormatContext *s, KLVPacket *klv)
/* XXX: use AVBitStreamFilter */ /* XXX: use AVBitStreamFilter */
static int mxf_get_d10_aes3_packet(ByteIOContext *pb, AVStream *st, AVPacket *pkt, int64_t length) static int mxf_get_d10_aes3_packet(ByteIOContext *pb, AVStream *st, AVPacket *pkt, int64_t length)
{ {
uint8_t buffer[61444];
const uint8_t *buf_ptr, *end_ptr; const uint8_t *buf_ptr, *end_ptr;
uint8_t *data_ptr; uint8_t *data_ptr;
int i; int i;
if (length > 61444) /* worst case PAL 1920 samples 8 channels */ if (length > 61444) /* worst case PAL 1920 samples 8 channels */
return -1; return -1;
get_buffer(pb, buffer, length);
av_new_packet(pkt, length); av_new_packet(pkt, length);
get_buffer(pb, pkt->data, length);
data_ptr = pkt->data; data_ptr = pkt->data;
end_ptr = buffer + length; end_ptr = pkt->data + length;
buf_ptr = buffer + 4; /* skip SMPTE 331M header */ buf_ptr = pkt->data + 4; /* skip SMPTE 331M header */
for (; buf_ptr < end_ptr; ) { for (; buf_ptr < end_ptr; ) {
for (i = 0; i < st->codec->channels; i++) { for (i = 0; i < st->codec->channels; i++) {
uint32_t sample = bytestream_get_le32(&buf_ptr); uint32_t sample = bytestream_get_le32(&buf_ptr);