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28 #define DSS_HEAD_OFFSET_AUTHOR 0xc
29 #define DSS_AUTHOR_SIZE 16
31 #define DSS_HEAD_OFFSET_START_TIME 0x26
32 #define DSS_HEAD_OFFSET_END_TIME 0x32
33 #define DSS_TIME_SIZE 12
35 #define DSS_HEAD_OFFSET_ACODEC 0x2a4
36 #define DSS_ACODEC_DSS_SP 0x0
37 #define DSS_ACODEC_G723_1 0x2
39 #define DSS_HEAD_OFFSET_COMMENT 0x31e
40 #define DSS_COMMENT_SIZE 64
42 #define DSS_BLOCK_SIZE 512
43 #define DSS_AUDIO_BLOCK_HEADER_SIZE 6
44 #define DSS_FRAME_SIZE 42
72 int y, month,
d,
h, minute, sec;
81 if (sscanf(
string,
"%2d%2d%2d%2d%2d%2d", &y, &month, &
d, &
h, &minute, &sec) != 6)
85 snprintf(datetime,
sizeof(datetime),
"%.4d-%.2d-%.2dT%.2d:%.2d:%.2d",
86 y + 2000, month,
d,
h, minute, sec);
91 unsigned int size,
const char *
key)
165 if (
avio_seek(pb,
ctx->dss_header_size, SEEK_SET) !=
ctx->dss_header_size)
193 data[1] =
ctx->dss_sp_swap_byte;
206 int read_size,
ret,
offset = 0, buff_offset = 0;
209 if (
ctx->counter == 0)
226 if (
ctx->counter < read_size) {
229 if (ret < ctx->counter)
235 ctx->counter -= read_size;
245 if (
ctx->dss_sp_swap_byte < 0) {
262 if (
ctx->counter == 0)
290 if (ret < ctx->counter)
318 int64_t timestamp,
int flags)
326 seekto = timestamp / 264 * 41 / 506 * 512;
333 seekto +=
ctx->dss_header_size;
351 ctx->dss_sp_swap_byte = -1;
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.
#define DSS_HEAD_OFFSET_COMMENT
AVStream * avformat_new_stream(AVFormatContext *s, const struct AVCodec *c)
Add a new stream to a media file.
#define AVERROR_EOF
End of file.
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
static void dss_skip_audio_header(AVFormatContext *s, AVPacket *pkt)
static int dss_723_1_read_packet(AVFormatContext *s, AVPacket *pkt)
#define DSS_HEAD_OFFSET_ACODEC
static void dss_sp_byte_swap(DSSDemuxContext *ctx, uint8_t *data)
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.
#define DSS_ACODEC_DSS_SP
#define AV_DICT_DONT_STRDUP_VAL
Take ownership of a value that's been allocated with av_malloc() or another memory allocation functio...
static int dss_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
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.
#define DSS_HEAD_OFFSET_AUTHOR
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
static int dss_read_metadata_date(AVFormatContext *s, unsigned int offset, const char *key)
static int dss_sp_read_packet(AVFormatContext *s, AVPacket *pkt)
AVCodecParameters * codecpar
Codec parameters associated with this stream.
static int read_header(FFV1Context *f)
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
static const uint8_t frame_size[4]
This structure contains the data a format has to probe a file.
AVChannelLayout ch_layout
Audio only.
int sample_rate
Audio only.
const struct AVCodec * audio_codec
Forced audio codec.
#define DSS_ACODEC_G723_1
#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_WB32 unsigned int_TMPL AV_WB24 unsigned int_TMPL AV_WB16 unsigned int_TMPL byte
An AVChannelLayout holds information about the channel layout of audio data.
static const uint8_t header[24]
int avio_r8(AVIOContext *s)
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 offset
#define DSS_HEAD_OFFSET_END_TIME
#define i(width, name, range_min, range_max)
static int dss_read_metadata_string(AVFormatContext *s, unsigned int offset, unsigned int size, const char *key)
const AVInputFormat ff_dss_demuxer
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
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
static int dss_read_packet(AVFormatContext *s, AVPacket *pkt)
#define DSS_AUDIO_BLOCK_HEADER_SIZE
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
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.
static int read_probe(const AVProbeData *p)
#define avpriv_request_sample(...)
#define AV_CHANNEL_LAYOUT_MONO
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 pos
byte position in stream, -1 if unknown
static int dss_read_header(AVFormatContext *s)
#define flags(name, subs,...)
static int dss_probe(const AVProbeData *p)
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
#define MKTAG(a, b, c, d)
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base.