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31 #define ALP_TAG MKTAG('A', 'L', 'P', ' ')
32 #define ALP_MAX_READ_SIZE 4096
54 #if CONFIG_ALP_DEMUXER
64 if (
i != 8 &&
i != 12)
67 if (strncmp(
"ADPCM", p->
buf + 8, 6) != 0)
94 if (strncmp(
"ADPCM", hdr->
adpcm,
sizeof(hdr->
adpcm)) != 0)
192 if (
s->nb_streams != 1) {
197 par =
s->streams[0]->codecpar;
240 static const AVOption alp_options[] = {
243 .help =
"set file type",
254 .help =
"autodetect based on file extension",
265 .help =
"force .tun, used for music",
276 .help =
"force .pcm, used for sfx",
288 static const AVClass alp_muxer_class = {
291 .option = alp_options,
298 .extensions =
"tun,pcm",
301 .init = alp_write_init,
302 .write_header = alp_write_header,
304 .priv_class = &alp_muxer_class,
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
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
enum AVMediaType codec_type
General type of the encoded data.
This struct describes the properties of an encoded stream.
#define AV_CH_LAYOUT_MONO
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf type
#define AV_CH_LAYOUT_STEREO
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
#define AV_PKT_FLAG_CORRUPT
The packet content is corrupted.
#define AV_OPT_FLAG_ENCODING_PARAM
a generic parameter which can be set by the user for muxing or encoding
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
int av_match_ext(const char *filename, const char *extensions)
Return a positive value if the given filename has one of the given extensions, 0 otherwise.
#define AV_OPT_FLAG_AUDIO_PARAM
AVCodecParameters * codecpar
Codec parameters associated with this stream.
#define LIBAVUTIL_VERSION_INT
static int read_header(FFV1Context *f)
Describe the class of an AVClass context structure.
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
const char * av_default_item_name(void *ptr)
Return the context name.
This structure contains the data a format has to probe a file.
void avio_w8(AVIOContext *s, int b)
int sample_rate
Audio only.
unsigned int avio_rl32(AVIOContext *s)
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
@ AV_CODEC_ID_ADPCM_IMA_ALP
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
int avio_r8(AVIOContext *s)
void avio_wl32(AVIOContext *s, unsigned int val)
int flags
A combination of AV_PKT_FLAG values.
const char * avcodec_get_name(enum AVCodecID id)
Get the name of a codec.
#define i(width, name, range_min, range_max)
int block_align
Audio only.
@ AV_SAMPLE_FMT_S16
signed 16 bits
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
#define ALP_MAX_READ_SIZE
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
int bits_per_coded_sample
The number of bits per sample in the codedwords.
#define avpriv_request_sample(...)
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
This structure stores compressed data.
uint64_t channel_layout
Audio only.
#define flags(name, subs,...)
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
#define AVERROR_INVALIDDATA
Invalid data found when processing input.