56 #define LOWEST_AL_FORMAT FFMIN(FFMIN(AL_FORMAT_MONO8,AL_FORMAT_MONO16),FFMIN(AL_FORMAT_STEREO8,AL_FORMAT_STEREO16)) 81 static inline int al_get_error(ALCdevice *device,
const char** error_msg_ret)
83 ALCenum
error = alcGetError(device);
85 *error_msg_ret = (
const char*) alcGetString(device, error);
89 case ALC_INVALID_DEVICE:
92 case ALC_INVALID_CONTEXT:
93 case ALC_INVALID_ENUM:
94 case ALC_INVALID_VALUE:
97 case ALC_OUT_OF_MEMORY:
112 if (!(devices = alcGetString(
NULL, ALC_CAPTURE_DEVICE_SPECIFIER)))
115 av_log(log_ctx,
AV_LOG_INFO,
"List of OpenAL capture devices on this system:\n");
117 for (; *devices !=
'\0'; devices += strlen(devices) + 1)
124 static const ALCenum sample_formats[2][2] = {
125 { AL_FORMAT_MONO8, AL_FORMAT_STEREO8 },
126 { AL_FORMAT_MONO16, AL_FORMAT_STEREO16 }
129 const char *error_msg;
142 alcCaptureOpenDevice(ctx->
url[0] ? ctx->
url :
NULL,
170 alcCaptureStart(ad->
device);
177 alcCaptureCloseDevice(ad->
device);
187 const char *error_msg;
192 alcGetIntegerv(ad->
device, ALC_CAPTURE_SAMPLES, (ALCsizei)
sizeof(ALCint), &nb_samples);
207 alcCaptureSamples(ad->
device, pkt->
data, nb_samples);
225 alcCaptureStop(ad->
device);
226 alcCaptureCloseDevice(ad->
device);
231 #define OFFSET(x) offsetof(al_data, x) 254 .priv_data_size =
sizeof(
al_data),
#define LIBAVUTIL_VERSION_INT
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
static const al_format_info * get_al_format_info(ALCenum al_fmt)
Get information about an AL_FORMAT value.
const char * av_default_item_name(void *ptr)
Return the context name.
static void print_al_capture_devices(void *log_ctx)
Print out a list of OpenAL capture devices on this system.
int av_usleep(unsigned usec)
Sleep for a period of time.
static void error(const char *err)
This struct describes the properties of an encoded stream.
ALCdevice * device
OpenAL capture device context.
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
int sample_rate
The sample rate (in Hz) of the captured audio.
static int read_packet(AVFormatContext *ctx, AVPacket *pkt)
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
int flags
Flags modifying the (de)muxer behaviour.
Main libavdevice API header.
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
AVCodecID
Identify the syntax and semantics of the bitstream.
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
int av_get_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
ALCenum sample_format
The OpenAL sample format of the captured audio.
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
char * url
input or output URL.
static int read_header(AVFormatContext *ctx)
enum AVMediaType codec_type
General type of the encoded data.
#define AVERROR_EXIT
Immediate exit was requested; the called function should not be restarted.
int channels
The number of channels in the captured audio.
int64_t av_gettime(void)
Get the current time in microseconds.
#define AV_LOG_INFO
Standard information.
static const AVOption options[]
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Describe the class of an AVClass context structure.
#define AV_OPT_FLAG_DECODING_PARAM
a generic parameter which can be set by the user for demuxing or decoding
ALCint sample_step
The number of bytes between two consecutive samples of the same channel/component.
int sample_size
The sample size (in bits) of the captured audio.
#define flags(name, subs,...)
int sample_rate
Audio only.
AVInputFormat ff_openal_demuxer
static int al_get_error(ALCdevice *device, const char **error_msg_ret)
Get the OpenAL error code, translated into an av/errno error code.
int list_devices
If true, print a list of capture devices on this system and exit.
void * priv_data
Format private data.
AVCodecParameters * codecpar
Codec parameters associated with this stream.
static int read_close(AVFormatContext *ctx)
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions
This structure stores compressed data.
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...