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45 if (
s->nb_streams != 1 ||
49 "GIF muxer supports only a single video GIF stream.\n");
66 x = bytestream2_get_byte(&gb);
70 x = bytestream2_get_byte(&gb);
72 int block_size = bytestream2_get_byte(&gb);
122 off += 3 * (1 << ((
pkt->
data[10] & 0x07) + 1));
136 if (gif->
loop >= 0) {
140 avio_write(pb,
"NETSCAPE2.0",
sizeof(
"NETSCAPE2.0") - 1);
148 if (delay_pos > 0 && delay_pos < pkt->
size - off - 2) {
158 if (delay_pos > 0 && delay_pos < pkt->
size - 2) {
191 #define OFFSET(x) offsetof(GIFContext, x)
192 #define ENC AV_OPT_FLAG_ENCODING_PARAM
194 {
"loop",
"Number of times to loop the output: -1 - no loop, 0 - infinite loop",
OFFSET(
loop),
196 {
"final_delay",
"Force delay (in centiseconds) after the last frame",
OFFSET(last_delay),
211 .p.mime_type =
"image/gif",
212 .p.extensions =
"gif",
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
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
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
#define GIF_GCE_EXT_LABEL
void av_packet_free(AVPacket **pkt)
Free the packet, if the packet is reference counted, it will be unreferenced first.
void avio_wl16(AVIOContext *s, unsigned int val)
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
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.
#define LIBAVUTIL_VERSION_INT
Describe the class of an AVClass context structure.
const char * av_default_item_name(void *ptr)
Return the context name.
void avio_w8(AVIOContext *s, int b)
int av_packet_ref(AVPacket *dst, const AVPacket *src)
Setup a new reference to the data described by a given packet.
static av_always_inline int bytestream2_get_bytes_left(GetByteContext *g)
static av_always_inline int bytestream2_tell(GetByteContext *g)
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
#define AV_NOPTS_VALUE
Undefined timestamp value.
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
AVPacket * av_packet_alloc(void)
Allocate an AVPacket and set its fields to default values.
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
#define GIF_EXTENSION_INTRODUCER
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 GIF_APP_EXT_LABEL
This structure stores compressed data.
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)