28 #define UNCHECKED_BITSTREAM_READER 1 186 if (pos + 10 > buf_size)
221 const int qscale = s->
qscale;
294 "Slice mismatch at MB: %d\n", xy);
339 if (bits_left == 0) {
341 }
else if (bits_left != 1) {
343 v |= 0x7F >> (7 - (bits_count & 7));
345 if (v == 0x7F && bits_left <= 8)
397 max_extra += 256 * 256 * 256 * 64;
399 if (left > max_extra)
401 "discarding %d junk bits at end, next would be %X\n",
413 "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
426 int buf_size = avpkt->
size;
457 "this codec does not support truncated bitstreams\n");
469 for(i=0; i < buf_size-3; i++) {
470 if (buf[i]==0 && buf[i+1]==0 && buf[i+2]==1) {
471 if (buf[i+3]==0xB0) {
509 }
else if (CONFIG_FLV_DECODER && s->
h263_flv) {
652 int prev_x = s->
mb_x, prev_y = s->
mb_y;
710 for (p=0; p<3; p++) {
714 for (y=0; y<(h>>1); y++)
717 pict->
data[p][x + y*linesize],
718 pict->
data[p][x + (h-1-y)*linesize]);
731 #if CONFIG_H263_VAAPI_HWACCEL || CONFIG_MPEG4_VAAPI_HWACCEL 734 #if CONFIG_MPEG4_NVDEC_HWACCEL 737 #if CONFIG_MPEG4_VDPAU_HWACCEL 740 #if CONFIG_H263_VIDEOTOOLBOX_HWACCEL || CONFIG_MPEG4_VIDEOTOOLBOX_HWACCEL 748 #if CONFIG_H263_VAAPI_HWACCEL 751 #if CONFIG_MPEG4_NVDEC_HWACCEL 754 #if CONFIG_MPEG4_VDPAU_HWACCEL 757 #if CONFIG_H263_VIDEOTOOLBOX_HWACCEL 778 .hw_configs = ff_h263_hw_config_list,
796 .hw_configs = ff_h263_hw_config_list,
int bitstream_buffer_size
#define FF_CODEC_CAP_INIT_CLEANUP
The codec allows calling the close function for deallocation even if the init function returned a fai...
#define AV_EF_AGGRESSIVE
consider things that a sane encoder should not do as an error
int ff_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt)
Select the (possibly hardware accelerated) pixel format.
const struct AVCodec * codec
discard all frames except keyframes
void ff_init_block_index(MpegEncContext *s)
qpel_mc_func avg_qpel_pixels_tab[2][16]
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
MPEG-2/4 4:2:0, H.264 default for 4:2:0.
This structure describes decoded (raw) audio or video data.
ptrdiff_t const GLvoid * data
static void flush(AVCodecContext *avctx)
int coded_width
Bitstream width / height, may be different from width/height e.g.
#define SLICE_NOEND
no end marker or error found but mb count exceeded
#define AV_LOG_WARNING
Something somehow does not look correct.
qpel_mc_func put_no_rnd_qpel_pixels_tab[2][16]
int ff_set_dimensions(AVCodecContext *s, int width, int height)
Check that the provided frame dimensions are valid and set them on the codec context.
hardware decoding through Videotoolbox
static av_cold int init(AVCodecContext *avctx)
static int decode_slice(MpegEncContext *s)
const AVCodecHWConfigInternal *const ff_h263_hw_config_list[]
void ff_er_frame_end(ERContext *s)
enum AVColorRange color_range
MPEG vs JPEG YUV range.
int msmpeg4_version
0=not msmpeg4, 1=mp41, 2=mp42, 3=mp43/divx3 4=wmv1/7 5=wmv2/8
av_cold void ff_h263dsp_init(H263DSPContext *ctx)
#define HWACCEL_NVDEC(codec)
uint8_t * bitstream_buffer
#define AV_EF_BUFFER
detect improper bitstream length
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown) That is the width of a pixel divided by the height of the pixel...
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
int ff_msmpeg4_decode_ext_header(MpegEncContext *s, int buf_size)
int ff_mpeg4_workaround_bugs(AVCodecContext *avctx)
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
int padding_bug_score
used to detect the VERY common padding bug in MPEG-4
int mb_num
number of MBs of a picture
const struct AVHWAccel * hwaccel
Hardware accelerator in use.
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
int ff_h263_decode_mb(MpegEncContext *s, int16_t block[6][64])
enum AVDiscard skip_frame
Skip decoding for selected frames.
void ff_mpeg4_clean_buffers(MpegEncContext *s)
#define AV_CODEC_CAP_DELAY
Encoder or decoder requires flushing with NULL input at the end in order to give the complete and cor...
void ff_mpeg_draw_horiz_band(MpegEncContext *s, int y, int h)
static enum AVPixelFormat h263_get_format(AVCodecContext *avctx)
void ff_h263_decode_init_vlc(void)
#define HWACCEL_VDPAU(codec)
enum OutputFormat out_format
output format
int ff_mpv_common_frame_size_change(MpegEncContext *s)
qpel_mc_func(* qpel_put)[16]
int av_frame_ref(AVFrame *dst, const AVFrame *src)
Set up a new reference to the data described by the source frame.
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
int no_rounding
apply no rounding to motion compensation (MPEG-4, msmpeg4, ...) for B-frames rounding mode is always ...
int ff_intel_h263_decode_picture_header(MpegEncContext *s)
Picture current_picture
copy of the current picture structure.
GetBitContext last_resync_gb
used to search for the next resync marker
int ff_find_unused_picture(AVCodecContext *avctx, Picture *picture, int shared)
static int get_bits_count(const GetBitContext *s)
int ff_set_sar(AVCodecContext *avctx, AVRational sar)
Check that the provided sample aspect ratio is valid and set it on the codec context.
av_cold void ff_mpv_idct_init(MpegEncContext *s)
int mb_height
number of MBs horizontally & vertically
int lowres
low resolution decoding, 1-> 1/2 size, 2->1/4 size
int codec_tag
internal codec_tag upper case converted from avctx codec_tag
#define AV_CODEC_FLAG_GRAY
Only decode/encode grayscale.
enum AVChromaLocation chroma_sample_location
This defines the location of chroma samples.
static void ff_update_block_index(MpegEncContext *s)
void ff_set_qscale(MpegEncContext *s, int qscale)
set qscale and update qscale dependent variables.
int ff_msmpeg4_decode_picture_header(MpegEncContext *s)
static int get_bits_left(GetBitContext *gb)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
int has_b_frames
Size of the frame reordering buffer in the decoder.
int last_dc[3]
last DC values for MPEG-1
void ff_er_add_slice(ERContext *s, int startx, int starty, int endx, int endy, int status)
Add a slice.
int ff_combine_frame(ParseContext *pc, int next, const uint8_t **buf, int *buf_size)
Combine the (truncated) bitstream to a complete frame.
int partitioned_frame
is current frame partitioned
int unrestricted_mv
mv can point outside of the coded picture
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
int flags
AV_CODEC_FLAG_*.
#define FF_BUG_NO_PADDING
int(* decode_mb)(struct MpegEncContext *s, int16_t block[12][64])
const char * name
Name of the codec implementation.
int low_delay
no reordering needed / has no B-frames
qpel_mc_func put_qpel_pixels_tab[2][16]
void ff_mpv_common_end(MpegEncContext *s)
int ff_mpeg4_decode_studio_slice_header(Mpeg4DecContext *ctx)
Decode the next video packet.
int ff_flv_decode_picture_header(MpegEncContext *s)
void ff_mpeg_flush(AVCodecContext *avctx)
static void frame_end(MpegEncContext *s)
int resync_mb_x
x position of last resync marker
uint8_t * error_status_table
void ff_h263_loop_filter(MpegEncContext *s)
#define AV_CODEC_CAP_DRAW_HORIZ_BAND
Decoder can use draw_horiz_band callback.
int ff_mpv_export_qp_table(MpegEncContext *s, AVFrame *f, Picture *p, int qp_type)
enum AVPixelFormat * pix_fmts
array of supported pixel formats, or NULL if unknown, array is terminated by -1
enum AVPictureType pict_type
Picture type of the frame.
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
#define av_assert1(cond)
assert() equivalent, that does not lie in speed critical code.
static int get_consumed_bytes(MpegEncContext *s, int buf_size)
Return the number of bytes consumed for building the current frame.
int next_p_frame_damaged
set if the next p frame is damaged, to avoid showing trashed B-frames
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 ff_thread_finish_setup() afterwards.If some code can't be moved
Picture * current_picture_ptr
pointer to the current picture
void ff_mpeg_er_frame_start(MpegEncContext *s)
int ff_wmv2_decode_secondary_picture_header(MpegEncContext *s)
static unsigned int show_bits(GetBitContext *s, int n)
Show 1-25 bits.
#define AV_EF_EXPLODE
abort decoding on minor error detection
#define FRAME_SKIPPED
Return value for header parsers if frame is not coded.
int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
HW acceleration through CUDA.
av_cold int ff_h263_decode_end(AVCodecContext *avctx)
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames...
#define MV_TYPE_16X16
1 vector for the whole mb
int first_slice_line
used in MPEG-4 too to handle resync markers
Libavcodec external API header.
void ff_h263_update_motion_val(MpegEncContext *s)
int h263_flv
use flv H.263 header
int(* end_frame)(AVCodecContext *avctx)
Called at the end of each frame or field picture.
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
main external API structure.
int height
picture size. must be a multiple of 16
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Tag MUST be and< 10hcoeff half pel interpolation filter coefficients, hcoeff[0] are the 2 middle coefficients[1] are the next outer ones and so on, resulting in a filter like:...eff[2], hcoeff[1], hcoeff[0], hcoeff[0], hcoeff[1], hcoeff[2]...the sign of the coefficients is not explicitly stored but alternates after each coeff and coeff[0] is positive, so...,+,-,+,-,+,+,-,+,-,+,...hcoeff[0] is not explicitly stored but found by subtracting the sum of all stored coefficients with signs from 32 hcoeff[0]=32-hcoeff[1]-hcoeff[2]-...a good choice for hcoeff and htaps is htaps=6 hcoeff={40,-10, 2}an alternative which requires more computations at both encoder and decoder side and may or may not be better is htaps=8 hcoeff={42,-14, 6,-2}ref_frames minimum of the number of available reference frames and max_ref_frames for example the first frame after a key frame always has ref_frames=1spatial_decomposition_type wavelet type 0 is a 9/7 symmetric compact integer wavelet 1 is a 5/3 symmetric compact integer wavelet others are reserved stored as delta from last, last is reset to 0 if always_reset||keyframeqlog quality(logarithmic quantizer scale) stored as delta from last, last is reset to 0 if always_reset||keyframemv_scale stored as delta from last, last is reset to 0 if always_reset||keyframe FIXME check that everything works fine if this changes between framesqbias dequantization bias stored as delta from last, last is reset to 0 if always_reset||keyframeblock_max_depth maximum depth of the block tree stored as delta from last, last is reset to 0 if always_reset||keyframequant_table quantization tableHighlevel bitstream structure:==============================--------------------------------------------|Header|--------------------------------------------|------------------------------------|||Block0||||split?||||yes no||||.........intra?||||:Block01:yes no||||:Block02:.................||||:Block03::y DC::ref index:||||:Block04::cb DC::motion x:||||.........:cr DC::motion y:||||.................|||------------------------------------||------------------------------------|||Block1|||...|--------------------------------------------|------------------------------------|||Y subbands||Cb subbands||Cr subbands||||------||------||------|||||LL0||HL0||||LL0||HL0||||LL0||HL0|||||------||------||------||||------||------||------|||||LH0||HH0||||LH0||HH0||||LH0||HH0|||||------||------||------||||------||------||------|||||HL1||LH1||||HL1||LH1||||HL1||LH1|||||------||------||------||||------||------||------|||||HH1||HL2||||HH1||HL2||||HH1||HL2|||||...||...||...|||------------------------------------|--------------------------------------------Decoding process:=================------------|||Subbands|------------||||------------|Intra DC||||LL0 subband prediction------------|\Dequantization-------------------\||Reference frames|\IDWT|--------------|Motion\|||Frame 0||Frame 1||Compensation.OBMC v-------|--------------|--------------.\------> Frame n output Frame Frame<----------------------------------/|...|-------------------Range Coder:============Binary Range Coder:-------------------The implemented range coder is an adapted version based upon"Range encoding: an algorithm for removing redundancy from a digitised message."by G.N.N.Martin.The symbols encoded by the Snow range coder are bits(0|1).The associated probabilities are not fix but change depending on the symbol mix seen so far.bit seen|new state---------+-----------------------------------------------0|256-state_transition_table[256-old_state];1|state_transition_table[old_state];state_transition_table={0, 0, 0, 0, 0, 0, 0, 0, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 190, 191, 192, 194, 194, 195, 196, 197, 198, 199, 200, 201, 202, 202, 204, 205, 206, 207, 208, 209, 209, 210, 211, 212, 213, 215, 215, 216, 217, 218, 219, 220, 220, 222, 223, 224, 225, 226, 227, 227, 229, 229, 230, 231, 232, 234, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 248, 0, 0, 0, 0, 0, 0, 0};FIXME Range Coding of integers:-------------------------FIXME Neighboring Blocks:===================left and top are set to the respective blocks unless they are outside of the image in which case they are set to the Null block top-left is set to the top left block unless it is outside of the image in which case it is set to the left block if this block has no larger parent block or it is at the left side of its parent block and the top right block is not outside of the image then the top right block is used for top-right else the top-left block is used Null block y, cb, cr are 128 level, ref, mx and my are 0 Motion Vector Prediction:=========================1.the motion vectors of all the neighboring blocks are scaled to compensate for the difference of reference frames scaled_mv=(mv *(256 *(current_reference+1)/(mv.reference+1))+128)> the median of the scaled left
void ff_print_debug_info(MpegEncContext *s, Picture *p, AVFrame *pict)
#define SLICE_END
end marker found
Picture * picture
main picture buffer
int data_partitioning
data partitioning flag from header
int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx)
Decode the first and second partition.
HW acceleration through VDPAU, Picture.data[3] contains a VdpVideoSurface.
#define AV_EF_IGNORE_ERR
ignore errors and continue
int slice_height
in macroblocks
int ff_h263_decode_picture_header(MpegEncContext *s)
int ff_mpv_frame_start(MpegEncContext *s, AVCodecContext *avctx)
generic function called after decoding the header and before a frame is decoded.
int pict_type
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
static enum AVPixelFormat pix_fmts[]
#define AV_CODEC_CAP_TRUNCATED
#define FF_BUG_AUTODETECT
autodetection
int h263_pred
use MPEG-4/H.263 ac/dc predictions
av_cold int ff_h263_decode_init(AVCodecContext *avctx)
int ff_h263_resync(MpegEncContext *s)
Decode the group of blocks / video packet header / slice header (MPEG-4 Studio).
int av_frame_make_writable(AVFrame *frame)
Ensure that the frame data is writable, avoiding data copy if possible.
int(* decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size)
Callback for each slice.
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
qpel_mc_func(* qpel_avg)[16]
Narrow or limited range content.
int(* start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size)
Called at the beginning of each frame or field picture.
Picture * next_picture_ptr
pointer to the next picture (for bidir pred)
struct AVCodecContext * avctx
discard all non reference
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_RB64
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
int mb_stride
mb_width+1 used for some arrays to allow simple addressing of left & top MBs without sig11 ...
void ff_mpv_decode_init(MpegEncContext *s, AVCodecContext *avctx)
Initialize the given MpegEncContext for decoding.
#define FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM
The decoder extracts and fills its parameters even if the frame is skipped due to the skip_frame sett...
const uint8_t * buffer_end
int ff_wmv2_decode_picture_header(MpegEncContext *s)
enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[]
Picture * last_picture_ptr
pointer to the previous picture.
#define H263_GOB_HEIGHT(h)
#define AVERROR_UNKNOWN
Unknown error, typically from an external library.
av_cold int ff_mpv_common_init(MpegEncContext *s)
init common structure for both encoder and decoder.
void ff_mpv_frame_end(MpegEncContext *s)
#define HWACCEL_VAAPI(codec)
void ff_mpv_reconstruct_mb(MpegEncContext *s, int16_t block[12][64])
int resync_mb_y
y position of last resync marker
int16_t(* block)[64]
points to one of the following blocks
ParseContext parse_context
int key_frame
1 -> keyframe, 0-> not
int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb, int header)
Decode MPEG-4 headers.
#define AV_CODEC_FLAG_TRUNCATED
Input bitstream might be truncated at a random location instead of only at frame boundaries.
int workaround_bugs
workaround bugs in encoders which cannot be detected automatically
MPEG-1 4:2:0, JPEG 4:2:0, H.263 4:2:0.
int ff_mpeg4_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
Find the end of the current frame in the bitstream.
av_cold void ff_qpeldsp_init(QpelDSPContext *c)
#define FFSWAP(type, a, b)
#define CONFIG_MSMPEG4_DECODER
void(* idct)(int16_t *block)
int ff_h263_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
#define FF_QSCALE_TYPE_MPEG1
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
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
AVPixelFormat
Pixel format.
This structure stores compressed data.
void ff_mpv_report_decode_progress(MpegEncContext *s)
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
#define AV_CEIL_RSHIFT(a, b)