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mov: Wrap stsc index and count compare in a separate function

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This commit is contained in:
Vittorio Giovara 2016-07-20 18:48:09 +02:00
parent 209ee680ce
commit 90bc423212
1 changed files with 10 additions and 5 deletions
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15
libavformat/mov.c
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@ -1961,12 +1961,17 @@ static int mov_read_stsc(MOVContext *c, AVIOContext *pb, MOVAtom atom)
return 0;
}
static inline int mov_stsc_index_valid(int index, int count)
{
return index + 1 < count;
}
/* Compute the samples value for the stsc entry at the given index. */
static inline int mov_get_stsc_samples(MOVStreamContext *sc, int index)
{
int chunk_count;
if (index < sc->stsc_count - 1)
if (mov_stsc_index_valid(index, sc->stsc_count))
chunk_count = sc->stsc_data[index + 1].first - sc->stsc_data[index].first;
else
chunk_count = sc->chunk_count - (sc->stsc_data[index].first - 1);
@ -2333,7 +2338,7 @@ static void mov_build_index(MOVContext *mov, AVStream *st)
for (i = 0; i < sc->chunk_count; i++) {
current_offset = sc->chunk_offsets[i];
while (stsc_index + 1 < sc->stsc_count &&
while (mov_stsc_index_valid(stsc_index, sc->stsc_count) &&
i + 1 == sc->stsc_data[stsc_index + 1].first)
stsc_index++;
for (j = 0; j < sc->stsc_data[stsc_index].count; j++) {
@ -2413,7 +2418,7 @@ static void mov_build_index(MOVContext *mov, AVStream *st)
count = (chunk_samples+1023) / 1024;
}
if (i < sc->stsc_count - 1)
if (mov_stsc_index_valid(i, sc->stsc_count))
chunk_count = sc->stsc_data[i+1].first - sc->stsc_data[i].first;
else
chunk_count = sc->chunk_count - (sc->stsc_data[i].first - 1);
@ -2434,7 +2439,7 @@ static void mov_build_index(MOVContext *mov, AVStream *st)
// populate index
for (i = 0; i < sc->chunk_count; i++) {
current_offset = sc->chunk_offsets[i];
if (stsc_index + 1 < sc->stsc_count &&
if (mov_stsc_index_valid(stsc_index, sc->stsc_count) &&
i + 1 == sc->stsc_data[stsc_index + 1].first)
stsc_index++;
chunk_samples = sc->stsc_data[stsc_index].count;
@ -3680,7 +3685,7 @@ static int mov_read_packet(AVFormatContext *s, AVPacket *pkt)
/* Keep track of the stsc index for the given sample, then check
* if the stsd index is different from the last used one. */
sc->stsc_sample++;
if (sc->stsc_index + 1 < sc->stsc_count &&
if (mov_stsc_index_valid(sc->stsc_index, sc->stsc_count) &&
mov_get_stsc_samples(sc, sc->stsc_index) == sc->stsc_sample) {
sc->stsc_index++;
sc->stsc_sample = 0;