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