30 #define DEFAULT_PACKET_SIZE 1024 31 #define OVERREAD_SIZE 3 77 for (; p < end - 3; p += 4) {
80 if (x & (~(x+0x01010101)) & 0x80808080) {
83 }
else if (p[1] == 0xff) {
85 }
else if (p[2] == 0xff) {
87 }
else if (p[3] == 0xff) {
93 for (; p <
end; ++p) {
94 if (*p == 0xff)
return p;
104 unsigned int soi_pos;
109 if (current_pos > current_pos + cache_size)
113 current_pos + cache_size +
136 uint8_t *startmarker_ptr, *
end, *search_end, marker;
155 if (startmarker_ptr >= search_end - 1 ||
156 *(startmarker_ptr + 1) !=
EOI)
break;
159 if (startmarker_ptr != search_end) {
160 marker = *(startmarker_ptr + 1);
165 mxg->
soi_ptr = startmarker_ptr;
166 }
else if (marker ==
EOI) {
191 }
else if ( (
SOF0 <= marker && marker <=
SOF15) ||
192 (
SOS <= marker && marker <=
COM) ) {
211 if (marker ==
APP13 && size >= 16) {
215 memcpy(pkt->
data, startmarker_ptr + 16, size - 14);
229 }
else if (marker ==
COM && size >= 18 &&
230 !strncmp(startmarker_ptr + 4,
"MXF", 3)) {
#define AV_LOG_WARNING
Something somehow does not look correct.
static uint8_t * mxg_find_startmarker(uint8_t *p, uint8_t *end)
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
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
MJPEG encoder and decoder.
static av_cold int end(AVCodecContext *avctx)
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
#define AVERROR_EOF
End of file.
static av_cold int read_close(AVFormatContext *ctx)
uint64_t channel_layout
Audio only.
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.
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
enum AVMediaType codec_type
General type of the encoded data.
static int mxg_read_packet(AVFormatContext *s, AVPacket *pkt)
common internal API header
int block_align
Audio only.
audio channel layout utility functions
#define DEFAULT_PACKET_SIZE
AVInputFormat ff_mxg_demuxer
void * av_fast_realloc(void *ptr, unsigned int *size, size_t min_size)
Reallocate the given buffer if it is not large enough, otherwise do nothing.
static int mxg_update_cache(AVFormatContext *s, unsigned int cache_size)
static int read_header(FFV1Context *f)
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
AVIOContext * pb
I/O context.
int error
contains the error code or 0 if no error happened
int sample_rate
Audio only.
static int mxg_close(struct AVFormatContext *s)
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
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...
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
#define AV_CH_LAYOUT_MONO
This structure stores compressed data.
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
#define AV_NOPTS_VALUE
Undefined timestamp value.
static int mxg_read_header(AVFormatContext *s)