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avformat/flvenc: use ff_format_shift_data for data shifting

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add_keyframe_index seems to generate a corrupted index even before this change.

Signed-off-by: Marton Balint <cus@passwd.hu>
This commit is contained in:
Marton Balint
2021-12-11 19:00:06 +01:00
parent 76e062322c
commit 10a0a8ca83
1 changed files with 6 additions and 53 deletions
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59
libavformat/flvenc.c
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@@ -576,15 +576,9 @@ static int flv_append_keyframe_info(AVFormatContext *s, FLVContext *flv, double
static int shift_data(AVFormatContext *s)
{
int ret = 0;
int n = 0;
int ret;
int64_t metadata_size = 0;
FLVContext *flv = s->priv_data;
int64_t pos, pos_end = avio_tell(s->pb); /* Save the pre-shift size. */
uint8_t *buf, *read_buf[2];
int read_buf_id = 0;
int read_size[2];
AVIOContext *read_pb;
metadata_size = flv->filepositions_count * 9 * 2 + 10; /* filepositions and times value */
metadata_size += 2 + 13; /* filepositions String */
@@ -596,58 +590,17 @@ static int shift_data(AVFormatContext *s)
if (metadata_size < 0)
return metadata_size;
buf = av_malloc_array(metadata_size, 2);
if (!buf) {
return AVERROR(ENOMEM);
}
read_buf[0] = buf;
read_buf[1] = buf + metadata_size;
ret = ff_format_shift_data(s, flv->keyframes_info_offset, metadata_size);
if (ret < 0)
return ret;
avio_seek(s->pb, flv->metadata_size_pos, SEEK_SET);
avio_wb24(s->pb, flv->metadata_totalsize + metadata_size);
avio_seek(s->pb, flv->metadata_totalsize_pos, SEEK_SET);
avio_seek(s->pb, flv->metadata_totalsize_pos + metadata_size, SEEK_SET);
avio_wb32(s->pb, flv->metadata_totalsize + 11 + metadata_size);
/* Shift the data: the AVIO context of the output can only be used for
* writing, so we re-open the same output, but for reading. It also avoids
* a read/seek/write/seek back and forth. */
avio_flush(s->pb);
ret = s->io_open(s, &read_pb, s->url, AVIO_FLAG_READ, NULL);
if (ret < 0) {
av_log(s, AV_LOG_ERROR, "Unable to re-open %s output file for "
"the second pass (add_keyframe_index)\n", s->url);
goto end;
}
/* Get ready for writing. */
avio_seek(s->pb, flv->keyframes_info_offset + metadata_size, SEEK_SET);
/* start reading at where the keyframe index information will be placed */
avio_seek(read_pb, flv->keyframes_info_offset, SEEK_SET);
pos = avio_tell(read_pb);
#define READ_BLOCK do { \
read_size[read_buf_id] = avio_read(read_pb, read_buf[read_buf_id], metadata_size); \
read_buf_id ^= 1; \
} while (0)
/* shift data by chunk of at most keyframe *filepositions* and *times* size */
READ_BLOCK;
do {
READ_BLOCK;
n = read_size[read_buf_id];
if (n < 0)
break;
avio_write(s->pb, read_buf[read_buf_id], n);
pos += n;
} while (pos <= pos_end);
ff_format_io_close(s, &read_pb);
end:
av_free(buf);
return ret;
return 0;
}
static int flv_init(struct AVFormatContext *s)