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37 #define RoQ_MAGIC_NUMBER 0x1084
38 #define RoQ_CHUNK_PREAMBLE_SIZE 8
39 #define RoQ_AUDIO_SAMPLE_RATE 22050
40 #define RoQ_CHUNKS_TO_SCAN 30
42 #define RoQ_INFO 0x1001
43 #define RoQ_QUAD_CODEBOOK 0x1002
44 #define RoQ_QUAD_VQ 0x1011
45 #define RoQ_SOUND_MONO 0x1020
46 #define RoQ_SOUND_STEREO 0x1021
101 unsigned int chunk_size;
102 unsigned int chunk_type;
103 unsigned int codebook_size;
108 while (!packet_read) {
118 chunk_type =
AV_RL16(&preamble[0]);
119 chunk_size =
AV_RL32(&preamble[2]);
120 if(chunk_size > INT_MAX)
125 switch (chunk_type) {
153 codebook_size = chunk_size;
161 if (chunk_size > INT_MAX)
165 avio_seek(pb, codebook_offset, SEEK_SET);
169 if (
ret != chunk_size)
225 if (
ret != chunk_size) {
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 AV_CHANNEL_LAYOUT_STEREO
AVStream * avformat_new_stream(AVFormatContext *s, const struct AVCodec *c)
Add a new stream to a media file.
#define AVERROR_EOF
End of file.
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
int nb_channels
Number of channels in this layout.
const FFInputFormat ff_roq_demuxer
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
static int roq_read_packet(AVFormatContext *s, AVPacket *pkt)
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16
AVCodecParameters * codecpar
Codec parameters associated with this stream.
static int read_header(FFV1Context *f)
This structure contains the data a format has to probe a file.
AVChannelLayout ch_layout
Audio only.
int sample_rate
Audio only.
#define RoQ_QUAD_CODEBOOK
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
An AVChannelLayout holds information about the channel layout of audio data.
int ffio_limit(AVIOContext *s, int size)
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
int block_align
Audio only.
static int roq_read_header(AVFormatContext *s)
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
static int roq_probe(const AVProbeData *p)
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
int index
stream index in AVFormatContext
#define RoQ_CHUNK_PREAMBLE_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.
static int read_probe(const AVProbeData *p)
int bits_per_coded_sample
The number of bits per sample in the codedwords.
#define AV_CHANNEL_LAYOUT_MONO
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
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
#define RoQ_AUDIO_SAMPLE_RATE
unsigned int audio_frame_count
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.