The function will be used in pa_sink_input_new() and
pa_source_output_new() to convert the sample spec given by the client
to a format info object. The set_format, set_rate and set_channels
will be set according to the stream flags (PA_SINK_INPUT_FIX_FORMAT
etc.).
---
src/pulsecore/core-format.c | 49 +++++++++++++++++++++++++++++++++++++++++++++
src/pulsecore/core-format.h | 18 +++++++++++++++++
2 files changed, 67 insertions(+)
diff --git a/src/pulsecore/core-format.c b/src/pulsecore/core-format.c
index ec90988..34976b7 100644
--- a/src/pulsecore/core-format.c
+++ b/src/pulsecore/core-format.c
@@ -113,6 +113,55 @@ int pa_format_info_get_channel_map(pa_format_info *f, pa_channel_map *map) {
return 0;
}
+pa_format_info *pa_format_info_from_sample_spec2(const pa_sample_spec *ss, const pa_channel_map *map, bool set_format,
+ bool set_rate, bool set_channels) {
+ pa_format_info *format;
+
+ pa_assert(ss);
+
+ format = pa_format_info_new();
+ format->encoding = PA_ENCODING_PCM;
+
+ if (set_format) {
+ if (!pa_sample_format_valid(ss->format))
+ goto fail;
+
+ pa_format_info_set_sample_format(format, ss->format);
+ }
+
+ if (set_rate) {
+ if (!pa_sample_rate_valid(ss->rate))
+ goto fail;
+
+ pa_format_info_set_rate(format, ss->rate);
+ }
+
+ if (set_channels) {
+ if (!pa_channels_valid(ss->channels))
+ goto fail;
+
+ pa_format_info_set_channels(format, ss->channels);
+
+ if (map) {
+ if (!pa_channel_map_valid(map))
+ goto fail;
+
+ if (map->channels != ss->channels)
+ goto fail;
+
+ pa_format_info_set_channel_map(format, map);
+ }
+ }
+
+ return format;
+
+fail:
+ if (format)
+ pa_format_info_free(format);
+
+ return NULL;
+}
+
int pa_format_info_to_sample_spec2(pa_format_info *f, pa_sample_spec *ss, pa_channel_map *map, pa_sample_spec *fallback_ss,
pa_channel_map *fallback_map) {
int r, r2;
diff --git a/src/pulsecore/core-format.h b/src/pulsecore/core-format.h
index 9342acc..ce3923e 100644
--- a/src/pulsecore/core-format.h
+++ b/src/pulsecore/core-format.h
@@ -22,6 +22,8 @@
#include <pulse/format.h>
+#include <stdbool.h>
+
/* Gets the sample format stored in the format info. Returns a negative error
* code on failure. If the sample format property is not set at all, returns
* -PA_ERR_NOENTITY. */
@@ -42,6 +44,22 @@ int pa_format_info_get_channels(pa_format_info *f, uint8_t *channels);
* -PA_ERR_NOENTITY. */
int pa_format_info_get_channel_map(pa_format_info *f, pa_channel_map *map);
+/* Convert a sample spec and an optional channel map to a new PCM format info
+ * object (remember to free it). If map is NULL, then the channel map will be
+ * left unspecified. If some fields of the sample spec should be ignored, pass
+ * false for set_format, set_rate and set_channels as appropriate, then those
+ * fields will be left unspecified. This function returns NULL if the input is
+ * invalid (for example, setting the sample rate was requested, but the rate
+ * in ss is invalid).
+ *
+ * pa_format_info_from_sample_spec() exists too. This "version 2" was created,
+ * because the original function doesn't provide the possibility of ignoring
+ * some of the sample spec fields. That functionality can't be added to the
+ * original function, because the function is a part of the public API and
+ * adding parameters to it would break the API. */
+pa_format_info *pa_format_info_from_sample_spec2(const pa_sample_spec *ss, const pa_channel_map *map, bool set_format,
+ bool set_rate, bool set_channels);
+
/* Convert the format info into a sample spec and a channel map. If the format
* info doesn't contain some information, the fallback sample spec and channel
* map are used to populate the output.
--
1.8.3.1
