[FFmpeg-devel] [PATCH 3/5] avformat/argo_asf: read multiple blocks at once

[Zane van Iperen]

Signed-off-by: Zane van Iperen <z...@zanevaniperen.com>
---
 libavformat/argo_asf.c | 21 ++++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/libavformat/argo_asf.c b/libavformat/argo_asf.c
index b1632f3ba5..deb64f7b1c 100644
--- a/libavformat/argo_asf.c
+++ b/libavformat/argo_asf.c
@@ -26,6 +26,9 @@
 #include "libavutil/opt.h"
 #include "argo_asf.h"
 
+/* Maximum number of blocks to read at once. */
+#define ASF_NB_BLOCKS 32
+
 typedef struct ArgoASFDemuxContext {
     ArgoASFFileHeader   fhdr;
     ArgoASFChunkHeader  ckhdr;
@@ -125,12 +128,10 @@ int ff_argo_asf_fill_stream(AVStream *st, const 
ArgoASFFileHeader *fhdr,
      * (nchannel control bytes) + ((bytes_per_channel) * nchannel)
      * For mono, this is 17. For stereo, this is 34.
      */
-    st->codecpar->frame_size            = st->codecpar->channels +
+    st->codecpar->block_align           = st->codecpar->channels +
                                           (ckhdr->num_samples / 2) *
                                           st->codecpar->channels;
 
-    st->codecpar->block_align           = st->codecpar->frame_size;
-
     st->codecpar->bit_rate              = st->codecpar->channels *
                                           st->codecpar->sample_rate *
                                           st->codecpar->bits_per_coded_sample;
@@ -221,15 +222,21 @@ static int argo_asf_read_packet(AVFormatContext *s, 
AVPacket *pkt)
     if (asf->blocks_read >= asf->ckhdr.num_blocks)
         return AVERROR_EOF;
 
-    if ((ret = av_get_packet(pb, pkt, st->codecpar->frame_size)) < 0)
+    ret = av_get_packet(pb, pkt, st->codecpar->block_align *
+                        FFMIN(ASF_NB_BLOCKS, asf->ckhdr.num_blocks - 
asf->blocks_read));
+    if (ret < 0)
         return ret;
-    else if (ret != st->codecpar->frame_size)
+
+    /* Something real screwy is going on. */
+    if (ret % st->codecpar->block_align != 0)
         return AVERROR_INVALIDDATA;
 
+
     pkt->stream_index   = st->index;
-    pkt->duration       = asf->ckhdr.num_samples;
+    pkt->duration       = asf->ckhdr.num_samples * (ret / 
st->codecpar->block_align);
+    asf->blocks_read   += (ret / st->codecpar->block_align);
 
-    ++asf->blocks_read;
+    pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
     return 0;
 }
 
-- 
2.25.4


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