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30 #define CDXL_HEADER_SIZE 32
49 const uint8_t *buf = p->
buf;
65 if (buf[0] == 1 &&
AV_RB16(&buf[20]) > 512)
67 if (buf[0] == 0 &&
AV_RB16(&buf[20]) > 768)
73 if (buf[0] == 0 && (!buf[26] || !
AV_RB16(&buf[24])))
77 if (buf[19] != 6 && buf[19] != 8 && buf[19] != 24)
122 uint32_t current_size, video_size, image_size;
134 if (cdxl->
header[0] > 1) {
148 if (!cdxl->
srate && audio_size)
152 if (cdxl->
header[19] == 0 ||
159 video_size = palette_size + image_size;
161 if ((
type == 1 && palette_size > 512) ||
162 (
type == 0 && palette_size > 768))
187 if (current_size && cdxl->
filesize > 0 && audio_size > 0)
210 if (current_size && cdxl->
filesize > 0)
247 #define OFFSET(x) offsetof(CDXLDemuxContext, x)
265 .p.extensions =
"cdxl,xl",
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.
#define AVERROR_EOF
End of file.
@ AV_OPT_TYPE_VIDEO_RATE
Underlying C type is AVRational.
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).
int buf_size
Size of buf except extra allocated bytes.
int64_t avio_size(AVIOContext *s)
Get the filesize.
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
void av_shrink_packet(AVPacket *pkt, int size)
Reduce packet size, correctly zeroing padding.
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
int64_t duration
Decoding: duration of the stream, in stream time base.
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
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 format(the sample packing is implied by the sample format) and sample rate. The lists are not just lists
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
uint8_t header[CDXL_HEADER_SIZE]
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.
Rational number (pair of numerator and denominator).
const char * av_default_item_name(void *ptr)
Return the context name.
This structure contains the data a format has to probe a file.
AVChannelLayout ch_layout
Audio only.
int sample_rate
Audio only.
int64_t nb_frames
number of frames in this stream if known or 0
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_RL24
int flags
A combination of AV_PKT_FLAG values.
void av_channel_layout_default(AVChannelLayout *ch_layout, int nb_channels)
Get the default channel layout for a given number of channels.
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
int index
stream index in AVFormatContext
@ AV_OPT_TYPE_INT
Underlying C type is int.
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.
#define AV_OPT_FLAG_DECODING_PARAM
A generic parameter which can be set by the user for demuxing or decoding.
static int read_probe(const AVProbeData *p)
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
@ AV_CODEC_ID_PCM_S8_PLANAR
#define flags(name, subs,...)
#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.
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_WB24 unsigned int_TMPL AV_RB16
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.