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spa: bump channels to 128 again

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Remove the SPA_AUDIO_MAX_POSITION define and use the
SPA_AUDIO_MAX_CHANNELS again.

Make a compile time define to override the default max channels of 64.

Make sure we compile the SPA library with the default 64 channels. If
you use the SPA library on a spa_audio_info you will get 64 channel
support, like before. If you want more channels, you will need to make
a padded structure or redefine the MAX_CHANNELS before you use the
spa_audio_info structures. You can use the padded structure with the
new functions that take the structure size.

With the extra checks in the parsing code, we avoid making a
valid spa_audio_info with too many channels that don't fit in the
structure. This means that code that receives a spa_audio_info can
assume there is enough padding for all the channels.
This commit is contained in:
Wim Taymans 2025-10-24 08:53:21 +02:00
parent be29ae4ef6
commit 6d74eee874
6 changed files with 15 additions and 20 deletions
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20
spa/include/spa/param/audio/raw.h
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@ -18,14 +18,10 @@ extern "C" {
* \{
*/
/* This is the max number of position info, changing this will change the
* ABI */
#define SPA_AUDIO_MAX_POSITION 64u
/* The suggested number of max channels, can be a compile time constant and
* does not affect ABI or API */
/* This is the max number of channels, changing this will change the
* size of some helper structures. This value should be at least 64 */
#ifndef SPA_AUDIO_MAX_CHANNELS
#define SPA_AUDIO_MAX_CHANNELS 128u
#define SPA_AUDIO_MAX_CHANNELS 64u
#endif
enum spa_audio_format {
@ -279,16 +275,18 @@ enum spa_audio_volume_ramp_scale {
#define SPA_AUDIO_FLAG_NONE (0) /*< no valid flag */
#define SPA_AUDIO_FLAG_UNPOSITIONED (1 << 0) /*< the position array explicitly
* contains unpositioned channels. */
/** Audio information description */
/** Audio information description. You can assume when you receive this structure
* that there is enought padding to accomodate all channel positions in case the
* channel count is more than SPA_AUDIO_MAX_CHANNELS. */
struct spa_audio_info_raw {
enum spa_audio_format format; /*< format, one of enum spa_audio_format */
uint32_t flags; /*< extra flags */
uint32_t rate; /*< sample rate */
uint32_t channels; /*< number of channels. This can be more than SPA_AUDIO_MAX_POSITION
uint32_t channels; /*< number of channels. This can be more than SPA_AUDIO_MAX_CHANNELS
* and you may assume there is enough padding for the extra
* channel positions. */
uint32_t position[SPA_AUDIO_MAX_POSITION]; /*< channel position from enum spa_audio_channel */
/* more channels can be added here */
uint32_t position[SPA_AUDIO_MAX_CHANNELS]; /*< channel position from enum spa_audio_channel */
/* padding follows here when channels > SPA_AUDIO_MAX_CHANNELS */
};
#define SPA_AUDIO_INFO_RAW_INIT(...) ((struct spa_audio_info_raw) { __VA_ARGS__ })