diff options
Diffstat (limited to 'ext/alsa/gstalsa.c')
| -rw-r--r-- | ext/alsa/gstalsa.c | 561 |
1 files changed, 0 insertions, 561 deletions
diff --git a/ext/alsa/gstalsa.c b/ext/alsa/gstalsa.c deleted file mode 100644 index 2cc37ab1..00000000 --- a/ext/alsa/gstalsa.c +++ /dev/null @@ -1,561 +0,0 @@ -/* Copyright (C) 2006 Tim-Philipp Müller <tim centricular net> - * - * This library is free software; you can redistribute it and/or - * modify it under the terms of the GNU Library General Public - * License as published by the Free Software Foundation; either - * version 2 of the License, or (at your option) any later version. - * - * This library is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Library General Public License for more details. - * - * You should have received a copy of the GNU Library General Public - * License along with this library; if not, write to the Free - * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - */ - -#include "gstalsa.h" - -#include <gst/audio/multichannel.h> - -static GstCaps * -gst_alsa_detect_rates (GstObject * obj, snd_pcm_hw_params_t * hw_params, - GstCaps * in_caps) -{ - GstCaps *caps; - guint min, max; - gint err, dir, min_rate, max_rate, i; - - GST_LOG_OBJECT (obj, "probing sample rates ..."); - - if ((err = snd_pcm_hw_params_get_rate_min (hw_params, &min, &dir)) < 0) - goto min_rate_err; - - if ((err = snd_pcm_hw_params_get_rate_max (hw_params, &max, &dir)) < 0) - goto max_rate_err; - - min_rate = min; - max_rate = max; - - if (min_rate < 4000) - min_rate = 4000; /* random 'sensible minimum' */ - - if (max_rate <= 0) - max_rate = G_MAXINT; /* or maybe just use 192400 or so? */ - else if (max_rate > 0 && max_rate < 4000) - max_rate = MAX (4000, min_rate); - - GST_DEBUG_OBJECT (obj, "Min. rate = %u (%d)", min_rate, min); - GST_DEBUG_OBJECT (obj, "Max. rate = %u (%d)", max_rate, max); - - caps = gst_caps_make_writable (in_caps); - - for (i = 0; i < gst_caps_get_size (caps); ++i) { - GstStructure *s; - - s = gst_caps_get_structure (caps, i); - if (min_rate == max_rate) { - gst_structure_set (s, "rate", G_TYPE_INT, min_rate, NULL); - } else { - gst_structure_set (s, "rate", GST_TYPE_INT_RANGE, - min_rate, max_rate, NULL); - } - } - - return caps; - - /* ERRORS */ -min_rate_err: - { - GST_ERROR_OBJECT (obj, "failed to query minimum sample rate: %s", - snd_strerror (err)); - gst_caps_unref (in_caps); - return NULL; - } -max_rate_err: - { - GST_ERROR_OBJECT (obj, "failed to query maximum sample rate: %s", - snd_strerror (err)); - gst_caps_unref (in_caps); - return NULL; - } -} - -static const struct -{ - const int width; - const int depth; - const int sformat; - const int uformat; -} pcmformats[] = { - { - 8, 8, SND_PCM_FORMAT_S8, SND_PCM_FORMAT_U8}, { - 16, 16, SND_PCM_FORMAT_S16, SND_PCM_FORMAT_U16}, { - 32, 24, SND_PCM_FORMAT_S24, SND_PCM_FORMAT_U24}, { -#if (G_BYTE_ORDER == G_LITTLE_ENDIAN) /* no endian-unspecific enum available */ - 24, 24, SND_PCM_FORMAT_S24_3LE, SND_PCM_FORMAT_U24_3LE}, { -#else - 24, 24, SND_PCM_FORMAT_S24_3BE, SND_PCM_FORMAT_U24_3BE}, { -#endif - 32, 32, SND_PCM_FORMAT_S32, SND_PCM_FORMAT_U32} -}; - -static GstCaps * -gst_alsa_detect_formats (GstObject * obj, snd_pcm_hw_params_t * hw_params, - GstCaps * in_caps) -{ - snd_pcm_format_mask_t *mask; - GstStructure *s; - GstCaps *caps; - gint i; - - snd_pcm_format_mask_malloc (&mask); - snd_pcm_hw_params_get_format_mask (hw_params, mask); - - caps = gst_caps_new_empty (); - - for (i = 0; i < gst_caps_get_size (in_caps); ++i) { - GstStructure *scopy; - gint w, width = 0, depth = 0; - - s = gst_caps_get_structure (in_caps, i); - if (!gst_structure_has_name (s, "audio/x-raw-int")) { - GST_WARNING_OBJECT (obj, "skipping non-int format"); - continue; - } - if (!gst_structure_get_int (s, "width", &width) || - !gst_structure_get_int (s, "depth", &depth)) - continue; - if (width == 0 || (width % 8) != 0) - continue; /* Only full byte widths are valid */ - for (w = 0; w < G_N_ELEMENTS (pcmformats); w++) - if (pcmformats[w].width == width && pcmformats[w].depth == depth) - break; - if (w == G_N_ELEMENTS (pcmformats)) - continue; /* Unknown format */ - - if (snd_pcm_format_mask_test (mask, pcmformats[w].sformat) && - snd_pcm_format_mask_test (mask, pcmformats[w].uformat)) { - /* template contains { true, false } or just one, leave it as it is */ - scopy = gst_structure_copy (s); - } else if (snd_pcm_format_mask_test (mask, pcmformats[w].sformat)) { - scopy = gst_structure_copy (s); - gst_structure_set (scopy, "signed", G_TYPE_BOOLEAN, TRUE, NULL); - } else if (snd_pcm_format_mask_test (mask, pcmformats[w].uformat)) { - scopy = gst_structure_copy (s); - gst_structure_set (scopy, "signed", G_TYPE_BOOLEAN, FALSE, NULL); - } else { - scopy = NULL; - } - if (scopy) { - if (width > 8) { - /* TODO: proper endianness detection, for now it's CPU endianness only */ - gst_structure_set (scopy, "endianness", G_TYPE_INT, G_BYTE_ORDER, NULL); - } - gst_caps_append_structure (caps, scopy); - } - } - - snd_pcm_format_mask_free (mask); - gst_caps_unref (in_caps); - return caps; -} - -/* we don't have channel mappings for more than this many channels */ -#define GST_ALSA_MAX_CHANNELS 8 - -static GstStructure * -get_channel_free_structure (const GstStructure * in_structure) -{ - GstStructure *s = gst_structure_copy (in_structure); - - gst_structure_remove_field (s, "channels"); - return s; -} - -static void -caps_add_channel_configuration (GstCaps * caps, - const GstStructure * in_structure, gint min_chans, gint max_chans) -{ - GstAudioChannelPosition pos[8] = { - GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT, - GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT, - GST_AUDIO_CHANNEL_POSITION_REAR_LEFT, - GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT, - GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER, - GST_AUDIO_CHANNEL_POSITION_LFE, - GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT, - GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT - }; - GstStructure *s = NULL; - gint c; - - if (min_chans == max_chans && max_chans <= 2) { - s = get_channel_free_structure (in_structure); - gst_structure_set (s, "channels", G_TYPE_INT, max_chans, NULL); - gst_caps_append_structure (caps, s); - return; - } - - g_assert (min_chans >= 1); - - /* mono and stereo don't need channel configurations */ - if (min_chans == 2) { - s = get_channel_free_structure (in_structure); - gst_structure_set (s, "channels", G_TYPE_INT, 2, NULL); - gst_caps_append_structure (caps, s); - } else if (min_chans == 1 && max_chans >= 2) { - s = get_channel_free_structure (in_structure); - gst_structure_set (s, "channels", GST_TYPE_INT_RANGE, 1, 2, NULL); - gst_caps_append_structure (caps, s); - } - - /* don't know whether to use 2.1 or 3.0 here - but I suspect - * alsa might work around that/fix it somehow. Can we tell alsa - * what our channel layout is like? */ - if (max_chans >= 3 && min_chans <= 3) { - GstAudioChannelPosition pos_21[3] = { - GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT, - GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT, - GST_AUDIO_CHANNEL_POSITION_LFE - }; - - s = get_channel_free_structure (in_structure); - gst_structure_set (s, "channels", G_TYPE_INT, 3, NULL); - gst_audio_set_channel_positions (s, pos_21); - gst_caps_append_structure (caps, s); - } - - /* everything else (4, 6, 8 channels) needs a channel layout */ - for (c = MAX (4, min_chans); c <= 8; c += 2) { - if (max_chans >= c) { - s = get_channel_free_structure (in_structure); - gst_structure_set (s, "channels", G_TYPE_INT, c, NULL); - gst_audio_set_channel_positions (s, pos); - gst_caps_append_structure (caps, s); - } - } - - for (c = MAX (9, min_chans); c <= max_chans; ++c) { - GstAudioChannelPosition *ch_layout; - guint i; - - ch_layout = g_new (GstAudioChannelPosition, c); - for (i = 0; i < c; ++i) { - ch_layout[i] = GST_AUDIO_CHANNEL_POSITION_NONE; - } - s = get_channel_free_structure (in_structure); - gst_structure_set (s, "channels", G_TYPE_INT, c, NULL); - gst_audio_set_channel_positions (s, ch_layout); - gst_caps_append_structure (caps, s); - g_free (ch_layout); - } -} - -static GstCaps * -gst_alsa_detect_channels (GstObject * obj, snd_pcm_hw_params_t * hw_params, - GstCaps * in_caps) -{ - GstCaps *caps; - guint min, max; - gint min_chans, max_chans; - gint err, i; - - GST_LOG_OBJECT (obj, "probing channels ..."); - - if ((err = snd_pcm_hw_params_get_channels_min (hw_params, &min)) < 0) - goto min_chan_error; - - if ((err = snd_pcm_hw_params_get_channels_max (hw_params, &max)) < 0) - goto max_chan_error; - - /* note: the above functions may return (guint) -1 */ - min_chans = min; - max_chans = max; - - if (min_chans < 0) { - min_chans = 1; - max_chans = GST_ALSA_MAX_CHANNELS; - } else if (max_chans < 0) { - max_chans = GST_ALSA_MAX_CHANNELS; - } - - if (min_chans > max_chans) { - gint temp; - - GST_WARNING_OBJECT (obj, "minimum channels > maximum channels (%d > %d), " - "please fix your soundcard drivers", min, max); - temp = min_chans; - min_chans = max_chans; - max_chans = temp; - } - - /* pro cards seem to return large numbers for min_channels */ - if (min_chans > GST_ALSA_MAX_CHANNELS) { - GST_DEBUG_OBJECT (obj, "min_chans = %u, looks like a pro card", min_chans); - if (max_chans < min_chans) { - max_chans = min_chans; - } else { - /* only support [max_chans; max_chans] for these cards for now - * to avoid inflating the source caps with loads of structures ... */ - min_chans = max_chans; - } - } else { - min_chans = MAX (min_chans, 1); - max_chans = MIN (GST_ALSA_MAX_CHANNELS, max_chans); - } - - GST_DEBUG_OBJECT (obj, "Min. channels = %d (%d)", min_chans, min); - GST_DEBUG_OBJECT (obj, "Max. channels = %d (%d)", max_chans, max); - - caps = gst_caps_new_empty (); - - for (i = 0; i < gst_caps_get_size (in_caps); ++i) { - GstStructure *s; - GType field_type; - gint c_min = min_chans; - gint c_max = max_chans; - - s = gst_caps_get_structure (in_caps, i); - /* the template caps might limit the number of channels (like alsasrc), - * in which case we don't want to return a superset, so hack around this - * for the two common cases where the channels are either a fixed number - * or a min/max range). Example: alsasrc template has channels = [1,2] and - * the detection will claim to support 8 channels for device 'plughw:0' */ - field_type = gst_structure_get_field_type (s, "channels"); - if (field_type == G_TYPE_INT) { - gst_structure_get_int (s, "channels", &c_min); - gst_structure_get_int (s, "channels", &c_max); - } else if (field_type == GST_TYPE_INT_RANGE) { - const GValue *val; - - val = gst_structure_get_value (s, "channels"); - c_min = CLAMP (gst_value_get_int_range_min (val), min_chans, max_chans); - c_max = CLAMP (gst_value_get_int_range_max (val), min_chans, max_chans); - } else { - c_min = min_chans; - c_max = max_chans; - } - - caps_add_channel_configuration (caps, s, c_min, c_max); - } - - gst_caps_unref (in_caps); - - return caps; - - /* ERRORS */ -min_chan_error: - { - GST_ERROR_OBJECT (obj, "failed to query minimum channel count: %s", - snd_strerror (err)); - return NULL; - } -max_chan_error: - { - GST_ERROR_OBJECT (obj, "failed to query maximum channel count: %s", - snd_strerror (err)); - return NULL; - } -} - -snd_pcm_t * -gst_alsa_open_iec958_pcm (GstObject * obj) -{ - char *iec958_pcm_name = NULL; - snd_pcm_t *pcm = NULL; - int res; - char devstr[256]; /* Storage for local 'default' device string */ - - /* - * Try and open our default iec958 device. Fall back to searching on card x - * if this fails, which should only happen on older alsa setups - */ - - /* The string will be one of these: - * SPDIF_CON: Non-audio flag not set: - * spdif:{AES0 0x0 AES1 0x82 AES2 0x0 AES3 0x2} - * SPDIF_CON: Non-audio flag set: - * spdif:{AES0 0x2 AES1 0x82 AES2 0x0 AES3 0x2} - */ - sprintf (devstr, - "iec958:{AES0 0x%02x AES1 0x%02x AES2 0x%02x AES3 0x%02x}", - IEC958_AES0_CON_EMPHASIS_NONE | IEC958_AES0_NONAUDIO, - IEC958_AES1_CON_ORIGINAL | IEC958_AES1_CON_PCM_CODER, - 0, IEC958_AES3_CON_FS_48000); - - GST_DEBUG_OBJECT (obj, "Generated device string \"%s\"", devstr); - iec958_pcm_name = devstr; - - res = snd_pcm_open (&pcm, iec958_pcm_name, SND_PCM_STREAM_PLAYBACK, 0); - if (G_UNLIKELY (res < 0)) { - GST_DEBUG_OBJECT (obj, "failed opening IEC958 device: %s", - snd_strerror (res)); - pcm = NULL; - } - - return pcm; -} - - -/* - * gst_alsa_probe_supported_formats: - * - * Takes the template caps and returns the subset which is actually - * supported by this device. - * - */ - -GstCaps * -gst_alsa_probe_supported_formats (GstObject * obj, snd_pcm_t * handle, - const GstCaps * template_caps) -{ - snd_pcm_hw_params_t *hw_params; - snd_pcm_stream_t stream_type; - GstCaps *caps; - gint err; - - snd_pcm_hw_params_malloc (&hw_params); - if ((err = snd_pcm_hw_params_any (handle, hw_params)) < 0) - goto error; - - stream_type = snd_pcm_stream (handle); - - caps = gst_caps_copy (template_caps); - - if (!(caps = gst_alsa_detect_formats (obj, hw_params, caps))) - goto subroutine_error; - - if (!(caps = gst_alsa_detect_rates (obj, hw_params, caps))) - goto subroutine_error; - - if (!(caps = gst_alsa_detect_channels (obj, hw_params, caps))) - goto subroutine_error; - - /* Try opening IEC958 device to see if we can support that format (playback - * only for now but we could add SPDIF capture later) */ - if (stream_type == SND_PCM_STREAM_PLAYBACK) { - snd_pcm_t *pcm = gst_alsa_open_iec958_pcm (obj); - - if (G_LIKELY (pcm)) { - gst_caps_append (caps, gst_caps_new_simple ("audio/x-iec958", NULL)); - snd_pcm_close (pcm); - } - } - - snd_pcm_hw_params_free (hw_params); - return caps; - - /* ERRORS */ -error: - { - GST_ERROR_OBJECT (obj, "failed to query formats: %s", snd_strerror (err)); - snd_pcm_hw_params_free (hw_params); - return NULL; - } -subroutine_error: - { - GST_ERROR_OBJECT (obj, "failed to query formats"); - snd_pcm_hw_params_free (hw_params); - return NULL; - } -} - -static gchar * -gst_alsa_find_device_name_no_handle (GstObject * obj, const gchar * devcard, - gint device_num, snd_pcm_stream_t stream) -{ - snd_ctl_card_info_t *info = NULL; - snd_ctl_t *ctl = NULL; - gchar *ret = NULL; - gint dev = -1; - - GST_LOG_OBJECT (obj, "[%s] device=%d", devcard, device_num); - - if (snd_ctl_open (&ctl, devcard, 0) < 0) - return NULL; - - snd_ctl_card_info_malloc (&info); - if (snd_ctl_card_info (ctl, info) < 0) - goto done; - - while (snd_ctl_pcm_next_device (ctl, &dev) == 0 && dev >= 0) { - if (dev == device_num) { - snd_pcm_info_t *pcminfo; - - snd_pcm_info_malloc (&pcminfo); - snd_pcm_info_set_device (pcminfo, dev); - snd_pcm_info_set_subdevice (pcminfo, 0); - snd_pcm_info_set_stream (pcminfo, stream); - if (snd_ctl_pcm_info (ctl, pcminfo) < 0) { - snd_pcm_info_free (pcminfo); - break; - } - - ret = (gchar *) snd_pcm_info_get_name (pcminfo); - if (ret) { - ret = g_strdup (ret); - GST_LOG_OBJECT (obj, "name from pcminfo: %s", ret); - } - snd_pcm_info_free (pcminfo); - if (ret) - break; - } - } - - if (ret == NULL) { - char *name = NULL; - gint card; - - GST_LOG_OBJECT (obj, "no luck so far, trying backup"); - card = snd_ctl_card_info_get_card (info); - snd_card_get_name (card, &name); - ret = g_strdup (name); - free (name); - } - -done: - snd_ctl_card_info_free (info); - snd_ctl_close (ctl); - - return ret; -} - -gchar * -gst_alsa_find_device_name (GstObject * obj, const gchar * device, - snd_pcm_t * handle, snd_pcm_stream_t stream) -{ - gchar *ret = NULL; - - if (device != NULL) { - gchar *dev, *comma; - gint devnum; - - GST_LOG_OBJECT (obj, "Trying to get device name from string '%s'", device); - - /* only want name:card bit, but not devices and subdevices */ - dev = g_strdup (device); - if ((comma = strchr (dev, ','))) { - *comma = '\0'; - devnum = atoi (comma + 1); - ret = gst_alsa_find_device_name_no_handle (obj, dev, devnum, stream); - } - g_free (dev); - } - - if (ret == NULL && handle != NULL) { - snd_pcm_info_t *info; - - GST_LOG_OBJECT (obj, "Trying to get device name from open handle"); - snd_pcm_info_malloc (&info); - snd_pcm_info (handle, info); - ret = g_strdup (snd_pcm_info_get_name (info)); - snd_pcm_info_free (info); - } - - GST_LOG_OBJECT (obj, "Device name for device '%s': %s", - GST_STR_NULL (device), GST_STR_NULL (ret)); - - return ret; -} |