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23 #include "config_components.h"
33 #define APM_FILE_HEADER_SIZE 20
34 #define APM_FILE_EXTRADATA_SIZE 80
35 #define APM_EXTRADATA_SIZE 28
37 #define APM_MAX_READ_SIZE 4096
39 #define APM_TAG_CODEC 0x2000
40 #define APM_TAG_VS12 MKTAG('v', 's', '1', '2')
41 #define APM_TAG_DATA MKTAG('D', 'A', 'T', 'A')
64 #if CONFIG_APM_DEMUXER
65 static void apm_parse_extradata(
APMExtraData *ext,
const uint8_t *buf)
160 apm_parse_extradata(&extradata, buf);
208 .read_probe = apm_probe,
209 .read_header = apm_read_header,
210 .read_packet = apm_read_packet
219 if (
s->nb_streams != 1) {
224 par =
s->streams[0]->codecpar;
288 int64_t file_size, data_size;
293 if (file_size >= UINT32_MAX) {
295 "Filesize %"PRId64
" invalid for APM, output file will be broken\n",
310 .p.extensions =
"apm",
313 .init = apm_write_init,
314 .write_header = apm_write_header,
316 .write_trailer = apm_write_trailer
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
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
enum AVMediaType codec_type
General type of the encoded data.
This struct describes the properties of an encoded stream.
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
int buf_size
Size of buf except extra allocated bytes.
int nb_channels
Number of channels in this layout.
void avio_wl16(AVIOContext *s, unsigned int val)
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
int64_t duration
Decoding: duration of the stream, in stream time base.
unsigned int avio_rl16(AVIOContext *s)
#define APM_FILE_HEADER_SIZE
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
#define FF_ARRAY_ELEMS(a)
#define AV_PKT_FLAG_CORRUPT
The packet content is corrupted.
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.
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
This structure contains the data a format has to probe a file.
#define APM_MAX_READ_SIZE
AVChannelLayout ch_layout
Audio only.
int sample_rate
Audio only.
int extradata_size
Size of the extradata content in bytes.
unsigned int avio_rl32(AVIOContext *s)
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
void avio_wl32(AVIOContext *s, unsigned int val)
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 * avcodec_get_name(enum AVCodecID id)
Get the name of a codec.
#define i(width, name, range_min, range_max)
int block_align
Audio only.
@ AV_CODEC_ID_ADPCM_IMA_APM
@ AV_SAMPLE_FMT_S16
signed 16 bits
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
#define AVIO_SEEKABLE_NORMAL
Seeking works like for a local file.
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 APM_EXTRADATA_SIZE
int bits_per_coded_sample
The number of bits per sample in the codedwords.
#define APM_FILE_EXTRADATA_SIZE
#define avpriv_request_sample(...)
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
This structure stores compressed data.
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
#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.