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52 uint32_t magic, nframes,
size, subversion,
i;
54 uint32_t sample_rate,
channels, palette[256];
60 if (magic ==
MKBETAG(
'A',
'N',
'I',
'M')) {
65 if (
size < 3 * 256 + 6)
76 for (
i = 0;
i < 256;
i++)
80 }
else if (magic ==
MKBETAG(
'S',
'A',
'N',
'M')) {
104 while (!got_audio && ((
read + 8) <
size)) {
105 uint32_t sig, chunk_size;
114 case MKBETAG(
'W',
'a',
'v',
'e'):
127 case MKBETAG(
'B',
'l',
'1',
'6'):
128 case MKBETAG(
'A',
'N',
'N',
'O'):
166 for (
i = 0;
i < 256;
i++)
206 case MKBETAG(
'F',
'R',
'M',
'E'):
215 case MKBETAG(
'B',
'l',
'1',
'6'):
223 case MKBETAG(
'W',
'a',
'v',
'e'):
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
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.
static int smush_read_probe(const AVProbeData *p)
AVStream * avformat_new_stream(AVFormatContext *s, const struct AVCodec *c)
Add a new stream to a media file.
#define AVERROR_EOF
End of file.
AVRational avg_frame_rate
Average framerate.
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 nb_channels
Number of channels in this layout.
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
static int smush_read_packet(AVFormatContext *ctx, AVPacket *pkt)
int64_t duration
Decoding: duration of the stream, in stream time base.
unsigned int avio_rl16(AVIOContext *s)
unsigned int avio_rb32(AVIOContext *s)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
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.
AVCodecParameters * codecpar
Codec parameters associated with this stream.
static int read_header(FFV1Context *f)
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented.
AVIOContext * pb
I/O context.
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
const FFInputFormat ff_smush_demuxer
unsigned int avio_rl32(AVIOContext *s)
unsigned int avio_rb24(AVIOContext *s)
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
#define MKBETAG(a, b, c, d)
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
int flags
A combination of AV_PKT_FLAG values.
#define i(width, name, range_min, range_max)
static av_always_inline AVRational av_inv_q(AVRational q)
Invert a rational.
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
int index
stream index in AVFormatContext
static int smush_read_header(AVFormatContext *ctx)
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
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.
#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.
void * priv_data
Format private data.
static uint32_t BS_FUNC() read(BSCTX *bc, unsigned int n)
Return n bits from the buffer, n has to be in the 0-32 range.
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.