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Code Issues Releases Activity

avcodec/apng: Add APNG_FCTL_CHUNK_SIZE define

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Also use it where appropriate.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt 2022-07-04 17:13:58 +02:00
parent 66a251e836
commit e4a10dd637
4 changed files with 9 additions and 6 deletions
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3
libavcodec/apng.h
View File

@ -38,4 +38,7 @@ enum {
APNG_BLEND_OP_OVER = 1,
};
/* Only the payload data, not including length, fourcc and CRC-32. */
#define APNG_FCTL_CHUNK_SIZE 26
#endif /* AVCODEC_APNG_H */

2
libavcodec/pngdec.c
View File

@ -972,7 +972,7 @@ static int decode_fctl_chunk(AVCodecContext *avctx, PNGDecContext *s,
uint32_t sequence_number;
int cur_w, cur_h, x_offset, y_offset, dispose_op, blend_op;
if (bytestream2_get_bytes_left(gb) != 26)
if (bytestream2_get_bytes_left(gb) != APNG_FCTL_CHUNK_SIZE)
return AVERROR_INVALIDDATA;
if (!(s->hdr_state & PNG_IHDR)) {

6
libavcodec/pngenc.c
View File

@ -988,7 +988,7 @@ static int encode_apng(AVCodecContext *avctx, AVPacket *pkt,
// to have the image data write to the correct place in the buffer
fctl_chunk.sequence_number = s->sequence_number;
++s->sequence_number;
s->bytestream += 26 + 12;
s->bytestream += APNG_FCTL_CHUNK_SIZE + 12;
ret = apng_encode_frame(avctx, pict, &fctl_chunk, &s->last_frame_fctl);
if (ret < 0)
@ -1002,7 +1002,7 @@ static int encode_apng(AVCodecContext *avctx, AVPacket *pkt,
if (s->last_frame) {
uint8_t* last_fctl_chunk_start = pkt->data;
uint8_t buf[26];
uint8_t buf[APNG_FCTL_CHUNK_SIZE];
if (!s->extra_data_updated) {
uint8_t *side_data = av_packet_new_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA, s->extra_data_size);
if (!side_data)
@ -1020,7 +1020,7 @@ static int encode_apng(AVCodecContext *avctx, AVPacket *pkt,
AV_WB16(buf + 22, s->last_frame_fctl.delay_den);
buf[24] = s->last_frame_fctl.dispose_op;
buf[25] = s->last_frame_fctl.blend_op;
png_write_chunk(&last_fctl_chunk_start, MKTAG('f', 'c', 'T', 'L'), buf, 26);
png_write_chunk(&last_fctl_chunk_start, MKTAG('f', 'c', 'T', 'L'), buf, sizeof(buf));
*got_packet = 1;
}

4
libavformat/apngdec.c
View File

@ -222,7 +222,7 @@ static int apng_read_header(AVFormatContext *s)
ctx->num_frames, ctx->num_play);
break;
case MKTAG('f', 'c', 'T', 'L'):
if (!acTL_found || len != 26) {
if (!acTL_found || len != APNG_FCTL_CHUNK_SIZE) {
return AVERROR_INVALIDDATA;
}
if ((ret = avio_seek(pb, -8, SEEK_CUR)) < 0)
@ -336,7 +336,7 @@ static int apng_read_packet(AVFormatContext *s, AVPacket *pkt)
switch (tag) {
case MKTAG('f', 'c', 'T', 'L'):
if (len != 26)
if (len != APNG_FCTL_CHUNK_SIZE)
return AVERROR_INVALIDDATA;
if ((ret = decode_fctl_chunk(s, ctx, pkt)) < 0)