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36 #define VMD_HEADER_SIZE 0x0330
37 #define BYTES_PER_FRAME_RECORD 16
76 if ((!
w ||
w > 2048 || !
h ||
h > 2048) &&
89 unsigned int toc_offset;
90 unsigned char *raw_frame_table;
91 int raw_frame_table_size;
92 int64_t current_offset;
95 unsigned int total_frames;
96 int64_t current_audio_pts = 0;
122 vst->codecpar->codec_tag = 0;
123 vst->codecpar->width =
width;
124 vst->codecpar->height =
height;
125 if(vmd->
is_indeo3 && vst->codecpar->width > 320){
126 vst->codecpar->width >>= 1;
127 vst->codecpar->height >>= 1;
170 av_reduce(&num, &den, num, den, (1UL<<31)-1);
183 raw_frame_table =
NULL;
187 raw_frame_table =
av_malloc(raw_frame_table_size);
193 if (
avio_read(pb, raw_frame_table, raw_frame_table_size) !=
194 raw_frame_table_size) {
202 current_offset =
AV_RL32(&raw_frame_table[6 *
i + 2]);
217 if (
size > INT_MAX / 2) {
234 if(!current_audio_pts)
235 current_audio_pts += sound_buffers - 1;
250 current_offset +=
size;
298 (
frame->frame_record[0] == 0x02) ?
"video" :
"audio",
static void error(const char *err)
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.
AVStream * avformat_new_stream(AVFormatContext *s, const struct AVCodec *c)
Add a new stream to a media file.
#define AVERROR_EOF
End of file.
static int vmd_read_close(AVFormatContext *s)
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
const AVInputFormat ff_vmd_demuxer
unsigned int frames_per_block
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
int buf_size
Size of buf except extra allocated bytes.
static av_cold int read_close(AVFormatContext *ctx)
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
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 type
int av_reduce(int *dst_num, int *dst_den, int64_t num, int64_t den, int64_t max)
Reduce a fraction.
#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 int current_frame
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.
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16
static int vmd_probe(const AVProbeData *p)
unsigned char vmd_header[VMD_HEADER_SIZE]
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 NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
static int vmd_read_header(AVFormatContext *s)
int ffio_limit(AVIOContext *s, int size)
void av_channel_layout_default(AVChannelLayout *ch_layout, int nb_channels)
Get the default channel layout for a given number of channels.
#define i(width, name, range_min, range_max)
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
int block_align
Audio only.
#define av_malloc_array(a, b)
static int vmd_read_packet(AVFormatContext *s, AVPacket *pkt)
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
int index
stream index in AVFormatContext
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
#define BYTES_PER_FRAME_RECORD
static int read_probe(const AVProbeData *p)
int bits_per_coded_sample
The number of bits per sample in the codedwords.
int64_t audio_sample_counter
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.
unsigned char frame_record[BYTES_PER_FRAME_RECORD]