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Codecs: mp4: Improve support for long files

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Reduce lookup_table (seek accuracy) till it fits on device

Fixes FS#13049

Change-Id: I934de500a4383e17b82821afa2e0396a27061707
This commit is contained in:
roman.artiukhin 2023-08-30 22:02:25 +03:00 • committed by Solomon Peachy
parent a190d0ca9c
commit 2c6dfd06a6
1 changed files with 27 additions and 8 deletions
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35
lib/rbcodec/codecs/libm4a/demux.c
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@ -468,9 +468,25 @@ static bool read_chunk_stco(qtmovie_t *qtmovie, size_t chunk_len)
numentries = stream_read_uint32(qtmovie->stream);
size_remaining -= 4;
qtmovie->res->num_lookup_table = numentries;
qtmovie->res->lookup_table = malloc(numentries * sizeof(*qtmovie->res->lookup_table));
uint8_t accuracy_divider = 1;
uint32_t fit_numentries = numentries;
while (true)
{
qtmovie->res->lookup_table = malloc(fit_numentries * sizeof(*qtmovie->res->lookup_table));
if (qtmovie->res->lookup_table)
{
break;
}
else
{
// we failed to alloc memory for lookup table, so reduce seek accuracy and try again
fit_numentries = numentries / ++accuracy_divider;
}
}
DEBUGF("lookup_table numentries %d, fit_numentries %d\n", numentries, fit_numentries);
qtmovie->res->num_lookup_table = fit_numentries;
if (!qtmovie->res->lookup_table)
{
@ -518,11 +534,14 @@ static bool read_chunk_stco(qtmovie_t *qtmovie, size_t chunk_len)
frame += (new_first - old_first) * old_frame;
}
frame += (k - old_first) * old_frame;
qtmovie->res->lookup_table[idx].sample = frame;
qtmovie->res->lookup_table[idx].offset = offset;
idx++;
if ((k-1) % accuracy_divider == 0)
{
qtmovie->res->lookup_table[idx].sample = frame;
qtmovie->res->lookup_table[idx].offset = offset;
idx++;
}
frame -= (k - old_first) * old_frame;
offset = stream_read_uint32(qtmovie->stream);