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format: Allow format->sample spec conversion for compressed formats

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This allows clients to get a "fake" sample space for compressed formats
that we can support. This should make size/time conversion for things
like calculating buffer attributes simpler.
This commit is contained in:
Arun Raghavan 2012-03-05 20:30:33 +05:30
parent 8baf8e90c2
commit a0706e7c84
6 changed files with 38 additions and 43 deletions
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46
src/pulse/format.c
View file

@ -218,6 +218,28 @@ pa_format_info* pa_format_info_from_sample_spec(pa_sample_spec *ss, pa_channel_m
return f;
}
/* For compressed streams */
static int pa_format_info_to_sample_spec_fake(pa_format_info *f, pa_sample_spec *ss) {
int rate;
pa_assert(f);
pa_assert(ss);
/* Note: When we add support for non-IEC61937 encapsulated compressed
* formats, this function should return a non-zero values for these. */
ss->format = PA_SAMPLE_S16LE;
ss->channels = 2;
pa_return_val_if_fail(pa_format_info_get_prop_int(f, PA_PROP_FORMAT_RATE, &rate) == 0, -PA_ERR_INVALID);
ss->rate = (uint32_t) rate;
if (f->encoding == PA_ENCODING_EAC3_IEC61937)
ss->rate *= 4;
return 0;
}
/* For PCM streams */
int pa_format_info_to_sample_spec(pa_format_info *f, pa_sample_spec *ss, pa_channel_map *map) {
char *sf = NULL, *m = NULL;
@ -226,7 +248,9 @@ int pa_format_info_to_sample_spec(pa_format_info *f, pa_sample_spec *ss, pa_chan
pa_assert(f);
pa_assert(ss);
pa_return_val_if_fail(f->encoding == PA_ENCODING_PCM, FALSE);
if (!pa_format_info_is_pcm(f))
return pa_format_info_to_sample_spec_fake(f, ss);
if (pa_format_info_get_prop_string(f, PA_PROP_FORMAT_SAMPLE_FORMAT, &sf))
goto out;
@ -260,26 +284,6 @@ out:
return ret;
}
/* For compressed streams */
int pa_format_info_to_sample_spec_fake(pa_format_info *f, pa_sample_spec *ss) {
int rate;
pa_assert(f);
pa_assert(ss);
pa_return_val_if_fail(f->encoding != PA_ENCODING_PCM, -PA_ERR_INVALID);
ss->format = PA_SAMPLE_S16LE;
ss->channels = 2;
pa_return_val_if_fail(pa_format_info_get_prop_int(f, PA_PROP_FORMAT_RATE, &rate) == 0, -PA_ERR_INVALID);
ss->rate = (uint32_t) rate;
if (f->encoding == PA_ENCODING_EAC3_IEC61937)
ss->rate *= 4;
return 0;
}
pa_prop_type_t pa_format_info_get_prop_type(pa_format_info *f, const char *key) {
const char *str;
json_object *o, *o1;

7
src/pulse/format.h
View file

@ -118,8 +118,11 @@ pa_format_info* pa_format_info_from_string(const char *str);
/** Utility function to take a \a pa_sample_spec and generate the corresponding \a pa_format_info. \since 2.0 */
pa_format_info* pa_format_info_from_sample_spec(pa_sample_spec *ss, pa_channel_map *map);
/** Utility function to generate a \a pa_sample_spec and \a pa_channel_map corresponding to a given \a pa_format_info. Returns
* a negative integer if conversion failed and 0 on success. \since 2.0 */
/** Utility function to generate a \a pa_sample_spec and \a pa_channel_map corresponding to a given \a pa_format_info. The
* conversion for PCM formats is straight-forward. For non-PCM formats, if there is a fixed size-time conversion (i.e. all
* IEC61937-encapsulated formats), a "fake" sample spec whose size-time conversion corresponds to this format is provided and
* the channel map argument is ignored. For formats with variable size-time conversion, this function will fail. Returns a
* negative integer if conversion failed and 0 on success. \since 2.0 */
int pa_format_info_to_sample_spec(pa_format_info *f, pa_sample_spec *ss, pa_channel_map *map);
/** Represents the type of value type of a property on a \ref pa_format_info. \since 2.0 */

1
src/pulse/internal.h
View file

@ -304,7 +304,6 @@ void pa_ext_device_restore_command(pa_context *c, uint32_t tag, pa_tagstruct *t)
void pa_ext_stream_restore_command(pa_context *c, uint32_t tag, pa_tagstruct *t);
void pa_format_info_free2(pa_format_info *f, void *userdata);
int pa_format_info_to_sample_spec_fake(pa_format_info *f, pa_sample_spec *ss);
pa_bool_t pa_mainloop_is_our_api(pa_mainloop_api*m);