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60 if (!memcmp(p->
buf,
"DAHUA", 5))
63 if (memcmp(p->
buf,
"DHAV", 4))
66 if (p->
buf[4] == 0xf0 ||
75 8000, 4000, 8000, 11025, 16000,
76 20000, 22050, 32000, 44100, 48000,
173 int frame_length, ext_length;
174 int64_t start, end,
ret;
194 if (frame_length < 24)
196 if (dhav->
type == 0xf1) {
211 return frame_length - 8 - (end - start);
216 int year, month, day, hour,
min, sec;
219 min = (date >> 6) & 0x3F;
220 hour = (date >> 12) & 0x1F;
221 day = (date >> 17) & 0x1F;
222 month = (date >> 22) & 0x0F;
223 year = ((date >> 26) & 0x3F) + 2000;
225 timeinfo->tm_year = year - 1900;
226 timeinfo->tm_mon = month - 1;
227 timeinfo->tm_mday = day;
228 timeinfo->tm_hour = hour;
229 timeinfo->tm_min =
min;
230 timeinfo->tm_sec = sec;
237 int64_t start = 0, end = 0;
239 int max_interations = 100000;
241 if (!
s->pb->seekable)
245 while (
avio_tell(
s->pb) > 12 && max_interations--) {
284 }
else if (
s->pb->seekable) {
310 DHAVStream *dst =
s->streams[stream_index]->priv_data;
327 dst->
pts = t * 1000LL;
412 if (stream_index < 0) {
424 if (dhav->
type != 0xfc)
437 int64_t timestamp,
int flags)
453 for (
int n = 0; n <
s->nb_streams; n++) {
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
enum AVMediaType codec_type
General type of the encoded data.
AVStream * avformat_new_stream(AVFormatContext *s, const struct AVCodec *c)
Add a new stream to a media file.
static int64_t get_pts(AVFormatContext *s, int stream_index)
#define AVERROR_EOF
End of file.
static int dhav_read_header(AVFormatContext *s)
static int dhav_probe(const AVProbeData *p)
AVRational avg_frame_rate
Average framerate.
static void get_timeinfo(unsigned date, struct tm *timeinfo)
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
int nb_channels
Number of channels in this layout.
int64_t avio_size(AVIOContext *s)
Get the filesize.
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
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
time_t av_timegm(struct tm *tm)
Convert the decomposed UTC time in tm to a time_t value.
@ AV_CODEC_ID_MP3
preferred ID for decoding MPEG audio layer 1, 2 or 3
int64_t duration
Decoding: duration of the stream, in stream time base.
unsigned int avio_rl16(AVIOContext *s)
static const char signature[]
#define FF_ARRAY_ELEMS(a)
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
static int read_chunk(AVFormatContext *s)
int64_t timestamp
Timestamp in AVStream.time_base units, preferably the time from which on correctly decoded frames are...
static int dhav_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
AVCodecParameters * codecpar
Codec parameters associated with this stream.
static int read_header(FFV1Context *f)
static int parse_ext(AVFormatContext *s, int length)
This structure contains the data a format has to probe a file.
static void seek_back(AVFormatContext *s, AVIOContext *pb, int64_t pos)
AVChannelLayout ch_layout
Audio only.
int sample_rate
Audio only.
static const uint32_t sample_rates[]
unsigned int avio_rl32(AVIOContext *s)
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
static int64_t get_duration(AVFormatContext *s)
#define AV_NOPTS_VALUE
Undefined timestamp value.
int64_t last_frame_number
static av_always_inline int diff(const struct color_info *a, const struct color_info *b, const int trans_thresh)
int avio_r8(AVIOContext *s)
int ffio_ensure_seekback(AVIOContext *s, int64_t buf_size)
Ensures that the requested seekback buffer size will be available.
int flags
A combination of AV_PKT_FLAG values.
#define AV_LOG_INFO
Standard information.
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
int64_t av_rescale(int64_t a, int64_t b, int64_t c)
Rescale a 64-bit integer with rounding to nearest.
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
const AVInputFormat ff_dhav_demuxer
int index
stream index in AVFormatContext
static int dhav_read_packet(AVFormatContext *s, AVPacket *pkt)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
static int read_probe(const AVProbeData *p)
#define avpriv_request_sample(...)
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
This structure stores compressed data.
int64_t pos
byte position in stream, -1 if unknown
#define flags(name, subs,...)
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
#define MKTAG(a, b, c, d)
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.