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47 const unsigned char *buf = p->
buf;
48 unsigned c, length = 0;
59 length = (length << 7) | (
c & 0x7F);
61 if (
c & 0x80 || length > 1024 || length < 21)
65 if (memcmp(buf,
"Version:Vivo/", 13))
69 if (*buf < '0' || *buf >
'2')
79 unsigned c, get_length = 0;
94 case 0: get_length = 1;
break;
95 case 1: vivo->
length = 128;
break;
96 case 2: get_length = 1;
break;
97 case 3: vivo->
length = 40;
break;
98 case 4: vivo->
length = 24;
break;
147 if (vivo->
length <= 1024) {
158 line_end = strstr(
line,
"\r\n");
180 value_int = strtol(
value, &end_value, 10);
182 if (*end_value == 0) {
185 if (!strcmp(
key,
"Duration")) {
187 }
else if (!strcmp(
key,
"Width")) {
189 }
else if (!strcmp(
key,
"Height")) {
191 }
else if (!strcmp(
key,
"TimeUnitNumerator")) {
192 fps.
num = value_int / 1000;
193 }
else if (!strcmp(
key,
"TimeUnitDenominator")) {
195 }
else if (!strcmp(
key,
"SamplingFrequency")) {
197 }
else if (!strcmp(
key,
"NominalBitrate")) {
198 }
else if (!strcmp(
key,
"Length")) {
205 if (!strcmp(
key,
"Version")) {
209 }
else if (!strcmp(
key,
"FPS")) {
261 unsigned old_sequence = vivo->
sequence, old_type = vivo->
type;
269 switch (vivo->
type) {
297 while (vivo->
sequence == old_sequence &&
298 (((vivo->
type - 1) >> 1) == ((old_type - 1) >> 1))) {
#define AV_LOG_WARNING
Something somehow does not look correct.
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.
#define AVERROR_EOF
End of file.
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
static int vivo_get_packet_header(AVFormatContext *s)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
static int vivo_probe(const AVProbeData *p)
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
static int vivo_read_packet(AVFormatContext *s, AVPacket *pkt)
AVCodecParameters * codecpar
Codec parameters associated with this stream.
static int vivo_read_header(AVFormatContext *s)
int av_sscanf(const char *string, const char *format,...)
See libc sscanf manual for more information.
static int read_header(FFV1Context *f)
Rational number (pair of numerator and denominator).
This structure contains the data a format has to probe a file.
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
int sample_rate
Audio only.
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
int avio_r8(AVIOContext *s)
AVInputFormat ff_vivo_demuxer
int block_align
Audio only.
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 default value
AVRational av_d2q(double d, int max)
Convert a double precision floating point number to a rational.
static av_always_inline AVRational av_inv_q(AVRational q)
Invert a rational.
int64_t av_rescale(int64_t a, int64_t b, int64_t c)
Rescale a 64-bit integer with rounding to nearest.
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
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.
int bits_per_coded_sample
The number of bits per sample in the codedwords.
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
This structure stores compressed data.
int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags)
Set the given entry in *pm, overwriting an existing entry.
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base.
The official guide to swscale for confused that consecutive non overlapping rectangles of slice_bottom special converter These generally are unscaled converters of common like for each output line the vertical scaler pulls lines from a ring buffer When the ring buffer does not contain the wanted line
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.