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22 #include "config_components.h"
70 "not found. This is a bug, please report it.\n");
110 #define DEC AV_OPT_FLAG_DECODING_PARAM
111 #define OFFSET(x) offsetof(AV1DemuxContext, x)
119 .
class_name =
"AV1 Annex B/low overhead OBU demuxer",
125 #if CONFIG_AV1_DEMUXER
139 if (
i <= 3 || (
i == 4 &&
bits < (1 << 4)))
143 if (++
i == 8 && more)
149 static int read_obu(
const uint8_t *buf,
int size,
int64_t *obu_size,
int *
type)
151 int start_pos, temporal_id, spatial_id;
155 type, &temporal_id, &spatial_id);
167 uint32_t temporal_unit_size, frame_unit_size, obu_unit_size;
173 ret = leb(pb, &temporal_unit_size, 1);
177 ret = leb(pb, &frame_unit_size, 0);
178 if (
ret < 0 || ((
int64_t)frame_unit_size +
ret) > temporal_unit_size)
181 ret = leb(pb, &obu_unit_size, 0);
182 if (
ret < 0 || ((
int64_t)obu_unit_size +
ret) >= frame_unit_size)
186 frame_unit_size -= obu_unit_size +
ret;
194 if (ret < 0 || type != AV1_OBU_TEMPORAL_DELIMITER || obu_size > 0)
196 cnt += obu_unit_size;
199 ret = leb(pb, &obu_unit_size, 0);
200 if (
ret < 0 || ((
int64_t)obu_unit_size +
ret) > frame_unit_size)
211 cnt += obu_unit_size;
217 frame_unit_size -= obu_unit_size +
ret;
218 }
while (frame_unit_size);
226 uint32_t obu_unit_size;
231 if (
c->temporal_unit_size ||
c->frame_unit_size)
236 if (!
c->temporal_unit_size) {
237 len = leb(
s->pb, &
c->temporal_unit_size, 1);
239 else if (
len < 0)
return len;
242 if (!
c->frame_unit_size) {
243 len = leb(
s->pb, &
c->frame_unit_size, 0);
246 if (((
int64_t)
c->frame_unit_size +
len) >
c->temporal_unit_size)
248 c->temporal_unit_size -=
len;
251 len = leb(
s->pb, &obu_unit_size, 0);
254 if (((
int64_t)obu_unit_size +
len) >
c->frame_unit_size)
260 if (
ret != obu_unit_size)
263 c->temporal_unit_size -= obu_unit_size +
len;
264 c->frame_unit_size -= obu_unit_size +
len;
270 "av1_frame_merge filter\n");
277 "send output packet\n");
288 .p.extensions =
"obu",
300 #if CONFIG_OBU_DEMUXER
304 static int read_obu_with_size(
const uint8_t *buf,
int buf_size,
int64_t *obu_size,
int *
type)
307 int ret, extension_flag, start_pos;
323 if (extension_flag) {
330 if (*obu_size > INT_MAX)
338 size = *obu_size + start_pos;
357 if (
ret < 0 || obu_size <= 0)
403 if (
s->io_repositioned) {
405 s->io_repositioned = 0;
417 "av1_frame_merge filter\n");
423 "send output packet\n");
434 .p.extensions =
"obu",
static int get_bits_left(GetBitContext *gb)
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.
@ AV_OPT_TYPE_VIDEO_RATE
Underlying C type is AVRational.
static int get_bits_count(const GetBitContext *s)
AVRational avg_frame_rate
Average framerate.
int error
contains the error code or 0 if no error happened
void(* filter)(uint8_t *src, int stride, int qscale)
void ffio_init_read_context(FFIOContext *s, const uint8_t *buffer, int buffer_size)
Wrap a buffer in an AVIOContext for reading.
int buf_size
Size of buf except extra allocated bytes.
@ AV1_OBU_TEMPORAL_DELIMITER
void av_bsf_free(AVBSFContext **pctx)
Free a bitstream filter context and everything associated with it; write NULL into the supplied point...
The bitstream filter state.
static void skip_bits(GetBitContext *s, int n)
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
static av_cold int read_close(AVFormatContext *ctx)
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
static int annexb_probe(const AVProbeData *p)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
static int parse_obu_header(const uint8_t *buf, int buf_size, int64_t *obu_size, int *start_pos, int *type, int *temporal_id, int *spatial_id)
void av_bsf_flush(AVBSFContext *ctx)
Reset the internal bitstream filter state.
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
int av_bsf_alloc(const AVBitStreamFilter *filter, AVBSFContext **pctx)
Allocate a context for a given bitstream filter.
#define FF_INFMT_FLAG_INIT_CLEANUP
For an FFInputFormat with this flag set read_close() needs to be called by the caller upon read_heade...
enum AVStreamParseType need_parsing
AVCodecParameters * codecpar
Codec parameters associated with this stream.
#define LIBAVUTIL_VERSION_INT
int av_bsf_init(AVBSFContext *ctx)
Prepare the filter for use, after all the parameters and options have been set.
static int read_header(FFV1Context *f)
Describe the class of an AVClass context structure.
int av_bsf_receive_packet(AVBSFContext *ctx, AVPacket *pkt)
Retrieve a filtered packet.
Rational number (pair of numerator and denominator).
const char * av_default_item_name(void *ptr)
Return the context name.
static unsigned int get_bits1(GetBitContext *s)
This structure contains the data a format has to probe a file.
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
int av_bsf_send_packet(AVBSFContext *ctx, AVPacket *pkt)
Submit a packet for filtering.
@ AV1_OBU_SEQUENCE_HEADER
static const uint8_t header[24]
int avio_r8(AVIOContext *s)
int ffio_ensure_seekback(AVIOContext *s, int64_t buf_size)
Ensures that the requested seekback buffer size will be available.
static void skip_bits1(GetBitContext *s)
#define i(width, name, range_min, range_max)
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
#define AV_INPUT_BUFFER_PADDING_SIZE
uint32_t temporal_unit_size
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
int eof_reached
true if was unable to read due to error or eof
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_BUG
Internal bug, also see AVERROR_BUG2.
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
int avcodec_parameters_copy(AVCodecParameters *dst, const AVCodecParameters *src)
Copy the contents of src to dst.
#define MAX_OBU_HEADER_SIZE
static int64_t get_leb128(GetBitContext *gb)
Read a unsigned integer coded as a variable number of up to eight little-endian bytes,...
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
const AVBitStreamFilter * av_bsf_get_by_name(const char *name)