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36 #define CACHED_BITSTREAM_READER HAVE_FAST_64BIT
37 #define UNCHECKED_BITSTREAM_READER 1
46 #define FPS_TAG MKTAG('F', 'P', 'S', 'x')
81 static int huff_cmp(
const void *va,
const void *vb)
83 const Node *
a = va, *
b = vb;
84 return (
a->count -
b->count)*256 +
a->sym -
b->sym;
91 int h,
const uint8_t *
src,
int size,
int Uoff,
99 for (
i = 0;
i < 256;
i++)
100 nodes[
i].count = bytestream_get_le32(&
src);
109 s->bdsp.bswap_buf((uint32_t *)
s->tmpbuf,
110 (
const uint32_t *)
src,
size >> 2);
115 for (j = 0; j <
h; j++) {
140 const uint8_t *buf = avpkt->
data;
141 int buf_size = avpkt->
size;
143 unsigned int version,header_size;
145 const uint32_t *buf32;
146 uint32_t *luma1,*luma2,*
cb,*
cr;
148 int i, j,
ret, is_chroma;
160 is_pal = buf[1] == 2 &&
version == 1;
161 header_size = (
header & (1<<30))? 8 : 4;
171 unsigned needed_size = avctx->
width * avctx->
height + 1024;
172 needed_size += header_size;
173 if (buf_size != needed_size) {
175 "Invalid frame length %d (should be %d)\n",
176 buf_size, needed_size);
180 unsigned needed_size = avctx->
width * avctx->
height * 3;
181 if (
version == 0) needed_size /= 2;
182 needed_size += header_size;
188 if (buf_size != needed_size) {
190 "Invalid frame length %d (should be %d)\n",
191 buf_size, needed_size);
206 if (offs[
i] >= buf_size - header_size || (
i && offs[
i] <= offs[
i - 1] + 1024)) {
211 offs[
planes] = buf_size - header_size;
234 if (((avctx->
width % 8) != 0) || ((avctx->
height % 2) != 0)) {
240 buf32 = (
const uint32_t*)buf;
241 for (y = 0; y < avctx->
height / 2; y++) {
242 luma1 = (uint32_t*)&
f->data[0][ y * 2 *
f->linesize[0] ];
243 luma2 = (uint32_t*)&
f->data[0][ (y * 2 + 1) *
f->linesize[0] ];
244 cr = (uint32_t*)&
f->data[1][ y *
f->linesize[1] ];
245 cb = (uint32_t*)&
f->data[2][ y *
f->linesize[2] ];
246 for (x = 0; x < avctx->
width; x += 8) {
259 uint32_t *pal = (uint32_t *)
f->data[1];
261 for (y = 0; y < 256; y++) {
262 pal[y] =
AV_RL32(buf) | 0xFF000000;
266 for (y = 0; y <avctx->
height; y++)
267 memcpy(&
f->data[0][y *
f->linesize[0]],
268 &buf[y * avctx->
width],
272 for (y = 0; y<avctx->
height; y++)
273 memcpy(&
f->data[0][(avctx->
height - y - 1) *
f->linesize[0]],
274 &buf[y * avctx->
width * 3],
288 avctx->
width >> is_chroma,
289 avctx->
height >> is_chroma,
290 buf + offs[
i], offs[
i + 1] - offs[
i],
291 is_chroma, 1)) < 0) {
303 buf + offs[
i], offs[
i + 1] - offs[
i], 0, 3)) < 0) {
310 for (j = 0; j < avctx->
height; j++) {
311 uint8_t *line_end =
out + 3*avctx->
width;
312 while (
out < line_end) {
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 AVColorSpace colorspace
YUV colorspace type.
static double cb(void *priv, double x, double y)
const FFCodec ff_fraps_decoder
This structure describes decoded (raw) audio or video data.
trying all byte sequences megabyte in length and selecting the best looking sequence will yield cases to try But a word about which is also called distortion Distortion can be quantified by almost any quality measurement one chooses the sum of squared differences is used but more complex methods that consider psychovisual effects can be used as well It makes no difference in this discussion First step
@ AVCOL_RANGE_JPEG
Full range content.
@ AV_PIX_FMT_BGR24
packed RGB 8:8:8, 24bpp, BGRBGR...
static av_cold int decode_end(AVCodecContext *avctx)
closes decoder
AVCodec p
The public AVCodec.
#define FF_HUFFMAN_FLAG_ZERO_COUNT
the pkt_dts and pkt_pts fields in AVFrame will work as usual Restrictions on codec whose streams don t reset across will not work because their bitstreams cannot be decoded in parallel *The contents of buffers must not be read before as well as code calling up to before the decode process starts Call have so the codec calls ff_thread_report set FF_CODEC_CAP_ALLOCATE_PROGRESS in AVCodec caps_internal and use ff_thread_get_buffer() to allocate frames. The frames must then be freed with ff_thread_release_buffer(). Otherwise decode directly into the user-supplied frames. Call ff_thread_report_progress() after some part of the current picture has decoded. A good place to put this is where draw_horiz_band() is called - add this if it isn 't called anywhere
#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.
#define FF_CODEC_DECODE_CB(func)
#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
av_cold void ff_bswapdsp_init(BswapDSPContext *c)
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
enum AVColorRange color_range
MPEG vs JPEG YUV range.
static int fraps2_decode_plane(FrapsContext *s, uint8_t *dst, int stride, int w, int h, const uint8_t *src, int size, int Uoff, const int step)
decode Fraps v2 packed plane
@ AV_PIX_FMT_YUVJ420P
planar YUV 4:2:0, 12bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV420P and setting col...
@ AV_PICTURE_TYPE_I
Intra.
static av_always_inline int get_vlc2(GetBitContext *s, const VLCElem *table, int bits, int max_depth)
Parse a vlc code.
@ AVCOL_RANGE_UNSPECIFIED
static int decode_frame(AVCodecContext *avctx, AVFrame *f, int *got_frame, AVPacket *avpkt)
static const struct @328 planes[]
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
void avpriv_report_missing_feature(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
static const uint8_t header[24]
The reader does not expect b to be semantically here and if the code is changed by maybe adding a a division or other the signedness will almost certainly be mistaken To avoid this confusion a new type was SUINT is the C unsigned type but it holds a signed int to use the same example SUINT a
#define i(width, name, range_min, range_max)
void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size)
Same behaviour av_fast_malloc but the buffer has additional AV_INPUT_BUFFER_PADDING_SIZE at the end w...
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
const char * name
Name of the codec implementation.
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
void ff_free_vlc(VLC *vlc)
@ AV_PIX_FMT_PAL8
8 bits with AV_PIX_FMT_RGB32 palette
int ff_huff_build_tree(void *logctx, VLC *vlc, int nb_codes, int nb_bits, Node *nodes, HuffCmp cmp, int flags)
nodes size must be 2*nb_codes first nb_codes nodes.count must be set
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
static int huff_cmp(const void *va, const void *vb)
Comparator - our nodes should ascend by count but with preserved symbol order.
main external API structure.
static av_cold int decode_init(AVCodecContext *avctx)
initializes decoder
This structure stores compressed data.
static double cr(void *priv, double x, double y)
int width
picture width / height.
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
@ AVCOL_SPC_BT709
also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / derived in SMPTE RP 177 Annex B