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avformat/apngenc: Add const where possible 

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt 2022-07-04 17:06:24 +02:00
parent 05e96e6933
commit 417554bdd6
1 changed files with 8 additions and 7 deletions
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15
libavformat/apngenc.c
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@ -48,7 +48,8 @@ typedef struct APNGMuxContext {
int extra_data_size;
} APNGMuxContext;
static uint8_t *apng_find_chunk(uint32_t tag, uint8_t *buf, size_t length)
static const uint8_t *apng_find_chunk(uint32_t tag, const uint8_t *buf,
size_t length)
{
size_t b;
for (b = 0; AV_RB32(buf + b) + 12ULL <= length - b; b += AV_RB32(buf + b) + 12ULL)
@ -134,15 +135,15 @@ static int flush_packet(AVFormatContext *format_context, AVPacket *packet)
}
if (apng->frame_number == 0 && !packet) {
uint8_t *existing_acTL_chunk;
uint8_t *existing_fcTL_chunk;
const uint8_t *existing_acTL_chunk;
const uint8_t *existing_fcTL_chunk;
av_log(format_context, AV_LOG_INFO, "Only a single frame so saving as a normal PNG.\n");
// Write normal PNG headers without acTL chunk
existing_acTL_chunk = apng_find_chunk(MKBETAG('a', 'c', 'T', 'L'), apng->extra_data, apng->extra_data_size);
if (existing_acTL_chunk) {
uint8_t *chunk_after_acTL = existing_acTL_chunk + AV_RB32(existing_acTL_chunk) + 12;
const uint8_t *chunk_after_acTL = existing_acTL_chunk + AV_RB32(existing_acTL_chunk) + 12;
avio_write(io_context, apng->extra_data, existing_acTL_chunk - apng->extra_data);
avio_write(io_context, chunk_after_acTL, apng->extra_data + apng->extra_data_size - chunk_after_acTL);
} else {
@ -152,7 +153,7 @@ static int flush_packet(AVFormatContext *format_context, AVPacket *packet)
// Write frame data without fcTL chunk
existing_fcTL_chunk = apng_find_chunk(MKBETAG('f', 'c', 'T', 'L'), apng->prev_packet->data, apng->prev_packet->size);
if (existing_fcTL_chunk) {
uint8_t *chunk_after_fcTL = existing_fcTL_chunk + AV_RB32(existing_fcTL_chunk) + 12;
const uint8_t *chunk_after_fcTL = existing_fcTL_chunk + AV_RB32(existing_fcTL_chunk) + 12;
avio_write(io_context, apng->prev_packet->data, existing_fcTL_chunk - apng->prev_packet->data);
avio_write(io_context, chunk_after_fcTL, apng->prev_packet->data + apng->prev_packet->size - chunk_after_fcTL);
} else {
@ -160,10 +161,10 @@ static int flush_packet(AVFormatContext *format_context, AVPacket *packet)
}
} else {
const uint8_t *data, *data_end;
uint8_t *existing_fcTL_chunk;
const uint8_t *existing_fcTL_chunk;
if (apng->frame_number == 0) {
uint8_t *existing_acTL_chunk;
const uint8_t *existing_acTL_chunk;
// Write normal PNG headers
avio_write(io_context, apng->extra_data, apng->extra_data_size);