38 const char *buf,
int *
offset,
45 switch (data_type & 0xff) {
69 *offset = samples << 2;
108 #define SPDIF_MAX_OFFSET 16384 120 const uint8_t *expected_code = buf + 7;
123 int consecutive_codes = 0;
126 for (; buf < probe_end; buf++) {
127 state = (state << 8) | *buf;
133 if (buf == expected_code) {
134 if (++consecutive_codes >= 2)
137 consecutive_codes = 0;
147 &buf[5], &offset, codec)) {
148 if (buf + offset >= p_buf + buf_size)
150 expected_code = buf +
offset;
151 buf = expected_code - 7;
182 state = (state << 8) |
avio_r8(pb);
190 if (pkt_size_bits % 16)
static int spdif_get_offset_and_codec(AVFormatContext *s, enum IEC61937DataType data_type, const char *buf, int *offset, enum AVCodecID *codec)
int64_t pos
byte position in stream, -1 if unknown
#define BURST_HEADER_SIZE
MPEG-2, layer-1 low sampling frequency.
#define avpriv_request_sample(...)
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
static int spdif_read_header(AVFormatContext *s)
int64_t bit_rate
Total stream bitrate in bit/s, 0 if not available.
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
void ff_spdif_bswap_buf16(uint16_t *dst, const uint16_t *src, int w)
int ctx_flags
Flags signalling stream properties.
if it could not because there are no more frames
int ff_spdif_probe(const uint8_t *p_buf, int buf_size, enum AVCodecID *codec)
int av_adts_header_parse(const uint8_t *buf, uint32_t *samples, uint8_t *frames)
Extract the number of samples and frames from AAC data.
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 offset
static int spdif_probe(const AVProbeData *p)
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
AVStream ** streams
A list of all streams in the file.
#define AVERROR_EOF
End of file.
DTS type II (1024 samples)
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
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.
DTS type III (2048 samples)
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
preferred ID for decoding MPEG audio layer 1, 2 or 3
enum AVMediaType codec_type
General type of the encoded data.
MPEG-1 layer 2 or 3 data or MPEG-2 without extension.
MPEG-2, layer-3 low sampling frequency.
#define AV_AAC_ADTS_HEADER_SIZE
int avio_r8(AVIOContext *s)
int buf_size
Size of buf except extra allocated bytes.
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
AVIOContext * pb
I/O context.
This structure contains the data a format has to probe a file.
void avpriv_report_missing_feature(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
MPEG-2, layer-2 low sampling frequency.
int sample_rate
Audio only.
unsigned int avio_rl16(AVIOContext *s)
MPEG-2 data with extension.
static const uint16_t spdif_mpeg_pkt_offset[2][3]
Filter the word “frame” indicates either a video frame or a group of audio samples
AVCodecParameters * codecpar
Codec parameters associated with this stream.
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
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
int ff_spdif_read_packet(AVFormatContext *s, AVPacket *pkt)
This structure stores compressed data.
Common code between the AC-3 encoder and decoder.
AVInputFormat ff_spdif_demuxer