29 #define LXF_MAX_PACKET_HEADER_SIZE 256 30 #define LXF_HEADER_DATA_SIZE 120 31 #define LXF_IDENT "LEITCH\0" 32 #define LXF_IDENT_LENGTH 8 33 #define LXF_SAMPLERATE 48000 74 for (x = 0; x <
size; x += 4)
123 if ((ret =
lxf_sync(s, header)) < 0)
126 ret =
avio_read(pb, header + LXF_IDENT_LENGTH, 8);
130 version = bytestream_get_le32(&p);
131 header_size = bytestream_get_le32(&p);
135 if (header_size < (version ? 72 : 60) ||
143 if ((ret =
avio_read(pb, header + (p - header),
144 header_size - (p - header))) !=
145 header_size - (p - header))
152 p += version ? 20 : 12;
159 ret = bytestream_get_le32(&p);
162 (int64_t)(uint32_t)
AV_RL32(p + 12));
173 audio_format = bytestream_get_le32(&p);
174 channels = bytestream_get_le32(&p);
175 track_size = bytestream_get_le32(&p);
208 "video doesn't seem to be PAL or NTSC. guessing PAL\n");
214 ret = av_popcount(channels) * track_size;
218 tmp = bytestream_get_le32(&p);
219 ret = bytestream_get_le32(&p);
235 uint32_t video_params, disk_params;
236 uint16_t record_date, expiration_date;
254 video_params =
AV_RL32(&header_data[40]);
255 record_date =
AV_RL16(&header_data[56]);
256 expiration_date =
AV_RL16(&header_data[58]);
257 disk_params =
AV_RL32(&header_data[116]);
266 record_date, 1900 + (record_date & 0x7F), (record_date >> 7) & 0xF,
267 (record_date >> 11) & 0x1F);
270 expiration_date, 1900 + (expiration_date & 0x7F), (expiration_date >> 7) & 0xF,
271 (expiration_date >> 11) & 0x1F);
273 if ((video_params >> 22) & 1)
276 if ((lxf->
channels = 1 << (disk_params >> 4 & 3) + 1)) {
306 "got packet with illegal stream index %"PRIu32
"\n", stream);
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
int frame_number
current video frame
#define AV_LOG_WARNING
Something somehow does not look correct.
static int lxf_sync(AVFormatContext *s, uint8_t *header)
Read input until we find the next ident.
#define avpriv_request_sample(...)
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
static int check_checksum(const uint8_t *header, int size)
Verify the checksum of an LXF packet header.
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
AVInputFormat ff_lxf_demuxer
int channels
number of audio channels. zero means no audio
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16
enum AVStreamParseType need_parsing
static int lxf_read_header(AVFormatContext *s)
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.
static const uint8_t header[24]
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
enum AVMediaType codec_type
General type of the encoded data.
int flags
A combination of AV_PKT_FLAG values.
int avio_r8(AVIOContext *s)
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.
preferred ID for MPEG-1/2 video decoding
#define LXF_MAX_PACKET_HEADER_SIZE
static int read_header(FFV1Context *f)
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
#define LXF_HEADER_DATA_SIZE
static int lxf_probe(const AVProbeData *p)
#define AV_LOG_INFO
Standard information.
AVIOContext * pb
I/O context.
static int lxf_read_packet(AVFormatContext *s, AVPacket *pkt)
static int get_packet_header(AVFormatContext *s)
Read and checksum the next packet header.
This structure contains the data a format has to probe a file.
static const AVCodecTag lxf_tags[]
void avpriv_report_missing_feature(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
int64_t duration
Decoding: duration of the stream, in stream time base.
int sample_rate
Audio only.
void * priv_data
Format private data.
int bits_per_coded_sample
The number of bits per sample in the codedwords.
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
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.
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
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
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
This structure stores compressed data.