mirror of
https://github.com/alsa-project/alsa-tools.git
synced 2026-03-04 01:40:17 -05:00
More enhancements:
- added getopt_long to parse the command line options - added -D (--device) option - added -q (--quiet) option - added -I (--iec958) option - added AC3 to IEC958 encapsulation code (not tested) - addec xrun detection and restart
This commit is contained in:
Jaroslav Kysela
parent
3f541f6ba8
commit
97a55787e6
13 changed files with 425 additions and 120 deletions
129
ac3dec/output.c
129
ac3dec/output.c
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@ -27,14 +27,15 @@ typedef unsigned int uint_32;
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#include "output.h"
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static int pcm_channels;
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static output_t out_config;
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static snd_pcm_t *pcm;
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/*
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* open the audio device for writing to
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*/
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int output_open(int bits, int rate, int channels)
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int output_open(output_t *output)
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{
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const char *pcm_name = output->pcm_name;
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char devstr[128];
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int card, dev;
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snd_pcm_hw_params_t *params;
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@ -45,33 +46,36 @@ int output_open(int bits, int rate, int channels)
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snd_pcm_hw_params_alloca(¶ms);
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snd_pcm_sw_params_alloca(&swparams);
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pcm_channels = channels;
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out_config = *output;
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/*
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* Open the device driver
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*/
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card = snd_defaults_pcm_card();
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dev = snd_defaults_pcm_device();
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if (card < 0 || dev < 0) {
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fprintf(stderr, "defaults are not set\n");
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return -ENODEV;
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if (pcm_name == NULL) {
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card = snd_defaults_pcm_card();
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dev = snd_defaults_pcm_device();
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if (card < 0 || dev < 0) {
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fprintf(stderr, "defaults are not set\n");
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return -ENODEV;
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}
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switch (output->channels) {
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case 1:
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case 2:
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sprintf(devstr, "plug:%d,%d", card, dev);
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break;
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case 4:
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sprintf(devstr, "surround40:%d,%d", card, dev);
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break;
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case 6:
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sprintf(devstr, "surround51:%d,%d", card, dev);
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break;
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default:
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fprintf(stderr, "%d channels are not supported\n", output->channels);
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return -EINVAL;
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}
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pcm_name = devstr;
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}
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switch (channels) {
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case 1:
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case 2:
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sprintf(devstr, "plug:%d,%d", card, dev);
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break;
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case 4:
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sprintf(devstr, "surround40:%d,%d", card, dev);
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break;
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case 6:
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sprintf(devstr, "surround51:%d,%d", card, dev);
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break;
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default:
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fprintf(stderr, "%d channels are not supported\n", channels);
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return -EINVAL;
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}
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if ((err = snd_pcm_open(&pcm, devstr, SND_PCM_STREAM_PLAYBACK, 0)) < 0) {
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if ((err = snd_pcm_open(&pcm, pcm_name, SND_PCM_STREAM_PLAYBACK, 0)) < 0) {
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fprintf(stderr, "snd_pcm_open: %s\n", snd_strerror(err));
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return err;
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}
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@ -87,17 +91,17 @@ int output_open(int bits, int rate, int channels)
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fprintf(stderr, "Access type not available");
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goto __close;
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}
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err = snd_pcm_hw_params_set_format(pcm, params, bits == 16 ? SND_PCM_FORMAT_S16_LE : SND_PCM_FORMAT_U8);
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err = snd_pcm_hw_params_set_format(pcm, params, output->bits == 16 ? SND_PCM_FORMAT_S16_LE : SND_PCM_FORMAT_U8);
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if (err < 0) {
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fprintf(stderr, "Sample format non available");
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goto __close;
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}
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err = snd_pcm_hw_params_set_channels(pcm, params, channels);
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err = snd_pcm_hw_params_set_channels(pcm, params, output->channels);
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if (err < 0) {
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fprintf(stderr, "Channels count non available");
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goto __close;
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}
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err = snd_pcm_hw_params_set_rate_near(pcm, params, rate, 0);
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err = snd_pcm_hw_params_set_rate_near(pcm, params, output->rate, 0);
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if (err < 0) {
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fprintf(stderr, "Rate not available");
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goto __close;
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@ -108,12 +112,16 @@ int output_open(int bits, int rate, int channels)
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fprintf(stderr, "Buffer time not available");
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goto __close;
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}
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period_time = snd_pcm_hw_params_set_period_time_near(pcm, params,
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100000, 0);
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if (period_time < 0) {
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fprintf(stderr, "Period time not available");
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goto __close;
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}
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period_time = 100000 * 2;
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do {
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period_time /= 2;
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period_time = snd_pcm_hw_params_set_period_time_near(pcm, params,
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period_time, 0);
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if (period_time < 0) {
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fprintf(stderr, "Period time not available");
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goto __close;
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}
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} while (buffer_time == period_time && period_time > 10000);
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if (buffer_time == period_time) {
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fprintf(stderr, "Buffer time and period time match, could not use\n");
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goto __close;
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@ -123,6 +131,50 @@ int output_open(int bits, int rate, int channels)
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goto __close;
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}
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if (output->spdif) {
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snd_pcm_info_t *info;
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snd_ctl_elem_value_t *ctl;
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snd_ctl_t *ctl_handle;
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char ctl_name[12];
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int ctl_card;
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snd_aes_iec958_t spdif;
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memset(&spdif, 0, sizeof(spdif));
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spdif.status[0] = IEC958_AES0_NONAUDIO |
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IEC958_AES0_CON_EMPHASIS_NONE;
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spdif.status[1] = IEC958_AES1_CON_ORIGINAL |
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IEC958_AES1_CON_PCM_CODER;
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spdif.status[2] = 0;
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spdif.status[3] = IEC958_AES3_CON_FS_48000;
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snd_pcm_info_alloca(&info);
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if ((err = snd_pcm_info(pcm, info)) < 0) {
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fprintf(stderr, "pcm info error: %s", snd_strerror(err));
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goto __close;
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}
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snd_ctl_elem_value_alloca(&ctl);
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snd_ctl_elem_value_set_interface(ctl, SND_CTL_ELEM_IFACE_PCM);
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snd_ctl_elem_value_set_device(ctl, snd_pcm_info_get_device(info));
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snd_ctl_elem_value_set_subdevice(ctl, snd_pcm_info_get_subdevice(info));
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snd_ctl_elem_value_set_name(ctl, SND_CTL_NAME_IEC958("",PLAYBACK,PCM_STREAM));
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snd_ctl_elem_value_set_iec958(ctl, &spdif);
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ctl_card = snd_pcm_info_get_card(info);
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if (ctl_card < 0) {
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fprintf(stderr, "Unable to setup the IEC958 (S/PDIF) interface - PCM has no assigned card\n");
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goto __diga_end;
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}
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sprintf(ctl_name, "hw:%d", ctl_card);
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if ((err = snd_ctl_open(&ctl_handle, ctl_name, 0)) < 0) {
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fprintf(stderr, "Unable to open the control interface '%s': %s\n", ctl_name, snd_strerror(err));
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goto __diga_end;
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}
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if ((err = snd_ctl_elem_write(ctl_handle, ctl)) < 0) {
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fprintf(stderr, "Unable to update the IEC958 control: %s\n", snd_strerror(err));
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goto __diga_end;
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}
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snd_ctl_close(ctl_handle);
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__diga_end:
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}
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return 0;
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__close:
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@ -134,15 +186,20 @@ int output_open(int bits, int rate, int channels)
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/*
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* play the sample to the already opened file descriptor
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*/
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void output_play(sint_16* output_samples, uint_32 num_frames)
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int output_play(sint_16* output_samples, uint_32 num_frames)
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{
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snd_pcm_sframes_t res;
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snd_pcm_sframes_t res = 0;
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res = snd_pcm_writei(pcm, (void *)output_samples, num_frames);
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do {
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if (res == -EPIPE)
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res = snd_pcm_prepare(pcm);
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res = res < 0 ? res : snd_pcm_writei(pcm, (void *)output_samples, num_frames);
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} while (res == -EPIPE);
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if (res < 0)
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fprintf(stderr, "writei returned error: %s\n", snd_strerror(res));
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else if (res != num_frames)
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fprintf(stderr, "writei retured %li (expected %li)\n", res, (long)(num_frames));
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return res < 0 ? (int)res : 0;
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}
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