Add wav file playback code using ALSA
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parent
905f9be573
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5 changed files with 256 additions and 0 deletions
64
alsa-audio/.cproject
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64
alsa-audio/.cproject
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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<?fileVersion 4.0.0?><cproject storage_type_id="org.eclipse.cdt.core.XmlProjectDescriptionStorage">
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<builder buildPath="${workspace_loc:/alsa-audio}/Debug" id="cdt.managedbuild.builder.gnu.cross.866785088" keepEnvironmentInBuildfile="false" managedBuildOn="true" name="Gnu Make Builder" superClass="cdt.managedbuild.builder.gnu.cross"/>
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<tool command="${CC}" id="cdt.managedbuild.tool.gnu.cross.c.compiler.1265550156" name="Cross GCC Compiler" superClass="cdt.managedbuild.tool.gnu.cross.c.compiler">
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<option id="gnu.c.compiler.option.misc.other.1122560822" superClass="gnu.c.compiler.option.misc.other" useByScannerDiscovery="false" value="${CFLAGS} -c" valueType="string"/>
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<tool id="cdt.managedbuild.tool.gnu.cross.cpp.compiler.874184357" name="Cross G++ Compiler" superClass="cdt.managedbuild.tool.gnu.cross.cpp.compiler">
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</tool>
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<tool command="${CC}" id="cdt.managedbuild.tool.gnu.cross.c.linker.1085007460" name="Cross GCC Linker" superClass="cdt.managedbuild.tool.gnu.cross.c.linker">
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<option id="gnu.c.link.option.libs.1646850397" superClass="gnu.c.link.option.libs" useByScannerDiscovery="false" valueType="libs">
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<listOptionValue builtIn="false" value="asound"/>
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</option>
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<inputType id="cdt.managedbuild.tool.gnu.c.linker.input.1700448547" superClass="cdt.managedbuild.tool.gnu.c.linker.input">
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<additionalInput kind="additionalinputdependency" paths="$(USER_OBJS)"/>
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<additionalInput kind="additionalinput" paths="$(LIBS)"/>
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</inputType>
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</tool>
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<tool id="cdt.managedbuild.tool.gnu.cross.cpp.linker.414934536" name="Cross G++ Linker" superClass="cdt.managedbuild.tool.gnu.cross.cpp.linker"/>
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<tool id="cdt.managedbuild.tool.gnu.cross.archiver.142861756" name="Cross GCC Archiver" superClass="cdt.managedbuild.tool.gnu.cross.archiver"/>
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<tool command="${AS}" id="cdt.managedbuild.tool.gnu.cross.assembler.506338534" name="Cross GCC Assembler" superClass="cdt.managedbuild.tool.gnu.cross.assembler">
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<inputType id="cdt.managedbuild.tool.gnu.assembler.input.1189854419" superClass="cdt.managedbuild.tool.gnu.assembler.input"/>
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</tool>
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</toolChain>
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</folderInfo>
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</configuration>
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<storageModule moduleId="org.eclipse.cdt.core.externalSettings"/>
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</cconfiguration>
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</storageModule>
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<storageModule moduleId="cdtBuildSystem" version="4.0.0">
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<project id="alsa-audio.cdt.managedbuild.target.gnu.cross.exe.1389774208" name="Executable" projectType="cdt.managedbuild.target.gnu.cross.exe"/>
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</storageModule>
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<storageModule moduleId="scannerConfiguration">
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<autodiscovery enabled="true" problemReportingEnabled="true" selectedProfileId=""/>
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<scannerConfigBuildInfo instanceId="cdt.managedbuild.config.gnu.cross.exe.debug.2104091374;cdt.managedbuild.config.gnu.cross.exe.debug.2104091374.;cdt.managedbuild.tool.gnu.cross.c.compiler.1265550156;cdt.managedbuild.tool.gnu.c.compiler.input.73563471">
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<autodiscovery enabled="true" problemReportingEnabled="true" selectedProfileId=""/>
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</scannerConfigBuildInfo>
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</storageModule>
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<storageModule moduleId="org.eclipse.cdt.core.LanguageSettingsProviders"/>
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<storageModule moduleId="org.eclipse.cdt.make.core.buildtargets"/>
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</cproject>
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1
alsa-audio/.gitignore
vendored
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1
alsa-audio/.gitignore
vendored
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/Debug/
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26
alsa-audio/.project
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26
alsa-audio/.project
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<?xml version="1.0" encoding="UTF-8"?>
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<projectDescription>
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<name>alsa-audio</name>
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<comment></comment>
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<projects>
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</projects>
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<buildSpec>
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<buildCommand>
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<name>org.eclipse.cdt.managedbuilder.core.genmakebuilder</name>
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<triggers>clean,full,incremental,</triggers>
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<arguments>
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</arguments>
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</buildCommand>
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<buildCommand>
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<name>org.eclipse.cdt.managedbuilder.core.ScannerConfigBuilder</name>
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<triggers>full,incremental,</triggers>
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<arguments>
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</arguments>
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</buildCommand>
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</buildSpec>
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<natures>
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<nature>org.eclipse.cdt.core.cnature</nature>
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<nature>org.eclipse.cdt.managedbuilder.core.managedBuildNature</nature>
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<nature>org.eclipse.cdt.managedbuilder.core.ScannerConfigNature</nature>
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</natures>
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</projectDescription>
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14
alsa-audio/.settings/language.settings.xml
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14
alsa-audio/.settings/language.settings.xml
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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<project>
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<configuration id="cdt.managedbuild.config.gnu.cross.exe.debug.2104091374" name="Debug">
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<extension point="org.eclipse.cdt.core.LanguageSettingsProvider">
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<provider copy-of="extension" id="org.eclipse.cdt.ui.UserLanguageSettingsProvider"/>
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<provider-reference id="org.eclipse.cdt.core.ReferencedProjectsLanguageSettingsProvider" ref="shared-provider"/>
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<provider-reference id="org.eclipse.cdt.managedbuilder.core.MBSLanguageSettingsProvider" ref="shared-provider"/>
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<provider class="org.eclipse.cdt.internal.build.crossgcc.CrossGCCBuiltinSpecsDetector" console="false" env-hash="643270697067650404" id="org.eclipse.cdt.build.crossgcc.CrossGCCBuiltinSpecsDetector" keep-relative-paths="false" name="CDT Cross GCC Built-in Compiler Settings" parameter="${COMMAND} ${FLAGS} -E -P -v -dD "${INPUTS}"" prefer-non-shared="true">
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<language-scope id="org.eclipse.cdt.core.gcc"/>
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<language-scope id="org.eclipse.cdt.core.g++"/>
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</provider>
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</extension>
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</configuration>
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</project>
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151
alsa-audio/monowavplayback.c
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151
alsa-audio/monowavplayback.c
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#include <stdio.h>
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#include <alsa/asoundlib.h>
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static unsigned int rate = 44100;
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int main(int argc, char *argv[])
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{
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FILE *fp;
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int dir;
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int err;
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int size;
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long loops;
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unsigned int rrate, val;
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char *buffer;
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char devname[32] = {0};
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snd_pcm_t *handle;
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snd_pcm_hw_params_t *params;
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snd_pcm_uframes_t frames;
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if (argc < 3) {
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printf("Usage: %s <wavefile_name> <module_name> <rate>\n", argv[0]);
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exit(EXIT_FAILURE);
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}
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if (argc >= 2) {
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fp = fopen(argv[1], "r");
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if (!fp) {
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printf("Could not open file %s\n", argv[1]);
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exit(EXIT_FAILURE);
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}
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}
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if (argc == 4) {
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rate = atoi(argv[3]);
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printf("Requested playback rate: %d\n", rate);
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}
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printf("Module Name: %s\n", argv[2]);
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if (!strcmp("colibri-vf", argv[2]))
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strcpy(devname, "default:CARD=Audio");
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else if (!strcmp("apalis-imx6", argv[2]))
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strcpy(devname, "default:CARD=imx6qapalissgtl");
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else if (!strcmp("colibri-imx6", argv[2]))
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strcpy(devname, "default:CARD=imx6qcolibrisgtl");
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else if (!strcmp("colibri-t20", argv[2]))
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strcpy(devname, "default:CARD=colibrit20wm971");
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else if (!strcmp("colibri-t30", argv[2]))
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strcpy(devname, "default:CARD=colibrit30sgtl5");
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err = snd_pcm_open(&handle, devname, SND_PCM_STREAM_PLAYBACK, 0);
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if (err < 0) {
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fprintf(stderr, "unable to open pcm device: %s\n", snd_strerror(err));
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exit(EXIT_FAILURE);
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}
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snd_pcm_hw_params_alloca(¶ms);
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err = snd_pcm_hw_params_any(handle, params);
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if (err < 0) {
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printf("Broken configuration for playback: no configurations available: %s\n", snd_strerror(err));
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return err;
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}
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err = snd_pcm_hw_params_set_access(handle, params, SND_PCM_ACCESS_RW_INTERLEAVED);
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if (err < 0) {
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printf("Resampling setup failed for playback: %s\n", snd_strerror(err));
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return err;
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}
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err = snd_pcm_hw_params_set_format(handle, params, SND_PCM_FORMAT_S16_LE);
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if (err < 0) {
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printf("Sample format not available for playback: %s\n", snd_strerror(err));
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return err;
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}
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err = snd_pcm_hw_params_set_channels(handle, params, 1);
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if (err < 0) {
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printf("Channels count (%i) not available for playbacks: %s\n", 1, snd_strerror(err));
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return err;
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}
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rrate = rate;
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err = snd_pcm_hw_params_set_rate_near(handle, params, &rrate, 0);
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if (err < 0) {
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printf("Rate %iHz not available for playback: %s\n", rrate, snd_strerror(err));
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return err;
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}
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if (rrate != rate) {
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printf("Rate doesn't match (requested %iHz, get %iHz)\n", rate, err);
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return -EINVAL;
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}
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err = snd_pcm_hw_params(handle, params);
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if (err < 0) {
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fprintf(stderr, "unable to set hw parameters: %s\n",
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snd_strerror(err));
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exit(EXIT_FAILURE);
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}
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/* Use a buffer large enough to hold one period */
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snd_pcm_hw_params_get_period_size(params, &frames, &dir);
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//size = frames * 4; /* 2 bytes/sample, 2 channels */
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size = frames * 2; /* 2 bytes/sample, 1 channel */
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buffer = (char *) malloc(size);
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if (!buffer) {
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snd_pcm_drain(handle);
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snd_pcm_close(handle);
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fclose(fp);
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return -ENOMEM;
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}
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/* We want to loop for 5 seconds */
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err = snd_pcm_hw_params_get_period_time(params, &val, &dir);
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if (err < 0) {
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printf("Unable to get period time for playback: %s\n", snd_strerror(err));
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return err;
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}
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/* 5 seconds in microseconds divided by period time */
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loops = 5000000 / val;
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while (1) {
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loops--;
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err = fread(buffer, 1, size, fp);
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if (err == 0) {
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fprintf(stderr, "end of file on input\n");
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break;
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} else if (err != size)
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fprintf(stderr, "short read: read %d bytes\n", err);
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err = snd_pcm_writei(handle, buffer, frames);
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if (err == -EPIPE) {
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/* EPIPE means underrun */
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fprintf(stderr, "underrun occurred\n");
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snd_pcm_prepare(handle);
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}
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else if (err < 0)
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fprintf(stderr, "error from writei: %s\n", snd_strerror(err));
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else if (err != (int)frames)
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fprintf(stderr, "short write, write %d frames\n", err);
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}
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snd_pcm_drain(handle);
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snd_pcm_close(handle);
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free(buffer);
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fclose(fp);
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return 0;
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}
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