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demux_edl: minor cleanup to header parsing 

EDL "headers" were always an afterthought, and kind of hacked on top of
the existing code. Improve it slightly, and make it follow the
conventions of the normal parsing. Basically use the same code structure
for them, just that they use different field names.
This commit is contained in:
wm4 2019-01-05 08:40:23 +01:00
parent f485e34fc9
commit 9f8d9c218b
1 changed files with 35 additions and 31 deletions
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66
demux/demux_edl.c
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@ -69,8 +69,6 @@ static bool parse_time(bstr str, double *out_time)
return true;
}
#define MAX_PARAMS 10
/* Returns a list of parts, or NULL on parse error.
* Syntax (without file header or URI prefix):
* url ::= <entry> ( (';' | '\n') <entry> )*
@ -89,9 +87,9 @@ static struct tl_parts *parse_edl(bstr str)
if (bstr_eatstart0(&str, "\n") || bstr_eatstart0(&str, ";"))
continue;
bool is_header = bstr_eatstart0(&str, "!");
bstr f_type = {0};
bstr f_init = {0};
struct tl_part p = { .length = -1 };
bstr param_names[MAX_PARAMS];
bstr param_vals[MAX_PARAMS];
int nparam = 0;
while (1) {
bstr name, val;
@ -100,6 +98,9 @@ static struct tl_parts *parse_edl(bstr str)
if (next > 0 && next < str.len && str.start[next] == '=') {
name = bstr_splice(str, 0, next);
str = bstr_cut(str, next + 1);
} else if (is_header) {
const char *names[] = {"type"}; // implied name
name = bstr0(nparam < 1 ? names[nparam] : "-");
} else {
const char *names[] = {"file", "start", "length"}; // implied name
name = bstr0(nparam < 3 ? names[nparam] : "-");
@ -116,45 +117,48 @@ static struct tl_parts *parse_edl(bstr str)
str = bstr_cut(str, next);
}
// Interpret parameters. Explicitly ignore unknown ones.
if (bstr_equals0(name, "file")) {
p.filename = bstrto0(tl, val);
} else if (bstr_equals0(name, "start")) {
if (!parse_time(val, &p.offset))
goto error;
p.offset_set = true;
} else if (bstr_equals0(name, "length")) {
if (!parse_time(val, &p.length))
goto error;
} else if (bstr_equals0(name, "timestamps")) {
if (bstr_equals0(val, "chapters"))
p.chapter_ts = true;
} else if (bstr_equals0(name, "title")) {
p.title = bstrto0(tl, val);
if (is_header) {
if (bstr_equals0(name, "type")) {
f_type = val;
} else if (bstr_equals0(name, "init")) {
f_init = val;
}
} else {
if (bstr_equals0(name, "file")) {
p.filename = bstrto0(tl, val);
} else if (bstr_equals0(name, "start")) {
if (!parse_time(val, &p.offset))
goto error;
p.offset_set = true;
} else if (bstr_equals0(name, "length")) {
if (!parse_time(val, &p.length))
goto error;
} else if (bstr_equals0(name, "timestamps")) {
if (bstr_equals0(val, "chapters"))
p.chapter_ts = true;
} else if (bstr_equals0(name, "title")) {
p.title = bstrto0(tl, val);
}
}
if (nparam >= MAX_PARAMS)
goto error;
param_names[nparam] = name;
param_vals[nparam] = val;
nparam++;
if (!bstr_eatstart0(&str, ","))
break;
}
if (is_header) {
bstr type = param_vals[0]; // value, because no "="
if (bstr_equals0(type, "mp4_dash")) {
if (bstr_equals0(f_type, "mp4_dash")) {
tl->dash = true;
if (nparam > 1 && bstr_equals0(param_names[1], "init"))
tl->init_fragment_url = bstrto0(tl, param_vals[1]);
} else if (bstr_equals0(type, "new_stream")) {
if (f_init.len)
tl->init_fragment_url = bstrto0(tl, f_init);
} else if (bstr_equals0(f_type, "new_stream")) {
struct tl_parts *ntl = talloc_zero(tl, struct tl_parts);
tl->next = ntl;
tl = ntl;
}
continue;
} else {
if (!p.filename)
goto error;
MP_TARRAY_APPEND(tl, tl->parts, tl->num_parts, p);
}
if (!p.filename)
goto error;
MP_TARRAY_APPEND(tl, tl->parts, tl->num_parts, p);
}
if (!root->num_parts)
goto error;