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format_g726: add support for seeking

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Added support for the seek function in format_g726
so playback can start from anywhere.
Before the fix, playback of g726 files
always started from the beginning.

ASTERISK-28246

Change-Id: I626235bc4642df1479050d3d06828412603a9b40
This commit is contained in:
eyalhasson
2019-01-22 17:24:23 +02:00
committed by Sean Bright
parent d87fc1c591
commit 9eb3a7a82c
1 changed files with 33 additions and 2 deletions
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35
formats/format_g726.c
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@@ -157,7 +157,38 @@ static int g726_write(struct ast_filestream *s, struct ast_frame *f)
static int g726_seek(struct ast_filestream *fs, off_t sample_offset, int whence)
{
return -1;
off_t offset = 0, min = 0, cur, max, distance;
if ((cur = ftello(fs->f)) < 0) {
ast_log(AST_LOG_WARNING, "Unable to determine current position in g726 filestream %p: %s\n", fs, strerror(errno));
return -1;
}
if (fseeko(fs->f, 0, SEEK_END) < 0) {
ast_log(AST_LOG_WARNING, "Unable to seek to end of g726 filestream %p: %s\n", fs, strerror(errno));
return -1;
}
if ((max = ftello(fs->f)) < 0) {
ast_log(AST_LOG_WARNING, "Unable to determine max position in g726 filestream %p: %s\n", fs, strerror(errno));
return -1;
}
/* have to fudge to frame here, so not fully to sample */
distance = sample_offset / 2;
if (whence == SEEK_SET) {
offset = distance;
} else if (whence == SEEK_CUR || whence == SEEK_FORCECUR) {
offset = distance + cur;
} else if (whence == SEEK_END) {
offset = max - distance;
}
if (whence != SEEK_FORCECUR) {
offset = offset > max ? max : offset;
offset = offset < min ? min : offset;
}
return fseeko(fs->f, offset, SEEK_SET);
}
static int g726_trunc(struct ast_filestream *fs)
@@ -167,7 +198,7 @@ static int g726_trunc(struct ast_filestream *fs)
static off_t g726_tell(struct ast_filestream *fs)
{
return -1;
return ftello(fs->f) << 1;
}
static struct ast_format_def f[] = {