FFmpeg
Data Structures | Macros | Functions
decode.c File Reference
#include <stdint.h>
#include <string.h>
#include "config.h"
#include "libavutil/avassert.h"
#include "libavutil/avstring.h"
#include "libavutil/bprint.h"
#include "libavutil/common.h"
#include "libavutil/frame.h"
#include "libavutil/hwcontext.h"
#include "libavutil/imgutils.h"
#include "libavutil/internal.h"
#include "libavutil/intmath.h"
#include "libavutil/opt.h"
#include "avcodec.h"
#include "bytestream.h"
#include "decode.h"
#include "hwconfig.h"
#include "internal.h"
#include "packet_internal.h"
#include "thread.h"

Go to the source code of this file.

Data Structures

struct  FramePool
 

Macros

#define IS_EMPTY(pkt)   (!(pkt)->data)
 
#define UTF8_MAX_BYTES   4 /* 5 and 6 bytes sequences should not be used */
 

Functions

static int apply_param_change (AVCodecContext *avctx, const AVPacket *avpkt)
 
static int extract_packet_props (AVCodecInternal *avci, AVPacket *pkt)
 
static int unrefcount_frame (AVCodecInternal *avci, AVFrame *frame)
 
int ff_decode_bsfs_init (AVCodecContext *avctx)
 Called during avcodec_open2() to initialize avctx->internal->bsf. More...
 
int ff_decode_get_packet (AVCodecContext *avctx, AVPacket *pkt)
 Called by decoders to get the next packet for decoding. More...
 
static int64_t guess_correct_pts (AVCodecContext *ctx, int64_t reordered_pts, int64_t dts)
 Attempt to guess proper monotonic timestamps for decoded video frames which might have incorrect times. More...
 
static int decode_simple_internal (AVCodecContext *avctx, AVFrame *frame)
 
static int decode_simple_receive_frame (AVCodecContext *avctx, AVFrame *frame)
 
static int decode_receive_frame_internal (AVCodecContext *avctx, AVFrame *frame)
 
int attribute_align_arg avcodec_send_packet (AVCodecContext *avctx, const AVPacket *avpkt)
 Supply raw packet data as input to a decoder. More...
 
static int apply_cropping (AVCodecContext *avctx, AVFrame *frame)
 
int attribute_align_arg avcodec_receive_frame (AVCodecContext *avctx, AVFrame *frame)
 Return decoded output data from a decoder. More...
 
static int compat_decode (AVCodecContext *avctx, AVFrame *frame, int *got_frame, const AVPacket *pkt)
 
int attribute_align_arg avcodec_decode_video2 (AVCodecContext *avctx, AVFrame *picture, int *got_picture_ptr, const AVPacket *avpkt)
 Decode the video frame of size avpkt->size from avpkt->data into picture. More...
 
int attribute_align_arg avcodec_decode_audio4 (AVCodecContext *avctx, AVFrame *frame, int *got_frame_ptr, const AVPacket *avpkt)
 Decode the audio frame of size avpkt->size from avpkt->data into frame. More...
 
static void get_subtitle_defaults (AVSubtitle *sub)
 
static int recode_subtitle (AVCodecContext *avctx, AVPacket *outpkt, const AVPacket *inpkt)
 
static int utf8_check (const uint8_t *str)
 
static void insert_ts (AVBPrint *buf, int ts)
 
static int convert_sub_to_old_ass_form (AVSubtitle *sub, const AVPacket *pkt, AVRational tb)
 
int avcodec_decode_subtitle2 (AVCodecContext *avctx, AVSubtitle *sub, int *got_sub_ptr, AVPacket *avpkt)
 Decode a subtitle message. More...
 
enum AVPixelFormat avcodec_default_get_format (struct AVCodecContext *avctx, const enum AVPixelFormat *fmt)
 
int ff_decode_get_hw_frames_ctx (AVCodecContext *avctx, enum AVHWDeviceType dev_type)
 Make sure avctx.hw_frames_ctx is set. More...
 
int avcodec_get_hw_frames_parameters (AVCodecContext *avctx, AVBufferRef *device_ref, enum AVPixelFormat hw_pix_fmt, AVBufferRef **out_frames_ref)
 Create and return a AVHWFramesContext with values adequate for hardware decoding. More...
 
static int hwaccel_init (AVCodecContext *avctx, const AVCodecHWConfigInternal *hw_config)
 
static void hwaccel_uninit (AVCodecContext *avctx)
 
int ff_get_format (AVCodecContext *avctx, const enum AVPixelFormat *fmt)
 Select the (possibly hardware accelerated) pixel format. More...
 
static void frame_pool_free (void *opaque, uint8_t *data)
 
static AVBufferRefframe_pool_alloc (void)
 
static int update_frame_pool (AVCodecContext *avctx, AVFrame *frame)
 
static int audio_get_buffer (AVCodecContext *avctx, AVFrame *frame)
 
static int video_get_buffer (AVCodecContext *s, AVFrame *pic)
 
int avcodec_default_get_buffer2 (AVCodecContext *avctx, AVFrame *frame, int flags)
 The default callback for AVCodecContext.get_buffer2(). More...
 
static int add_metadata_from_side_data (const AVPacket *avpkt, AVFrame *frame)
 
int ff_decode_frame_props (AVCodecContext *avctx, AVFrame *frame)
 Set various frame properties from the codec context / packet data. More...
 
static void validate_avframe_allocation (AVCodecContext *avctx, AVFrame *frame)
 
static void decode_data_free (void *opaque, uint8_t *data)
 
int ff_attach_decode_data (AVFrame *frame)
 
int ff_get_buffer (AVCodecContext *avctx, AVFrame *frame, int flags)
 Get a buffer for a frame. More...
 
static int reget_buffer_internal (AVCodecContext *avctx, AVFrame *frame, int flags)
 
int ff_reget_buffer (AVCodecContext *avctx, AVFrame *frame, int flags)
 Identical in function to ff_get_buffer(), except it reuses the existing buffer if available. More...
 

Macro Definition Documentation

#define IS_EMPTY (   pkt)    (!(pkt)->data)

Definition at line 146 of file decode.c.

Referenced by extract_packet_props(), and ff_decode_frame_props().

#define UTF8_MAX_BYTES   4 /* 5 and 6 bytes sequences should not be used */

Definition at line 840 of file decode.c.

Referenced by recode_subtitle().

Function Documentation

static int apply_param_change ( AVCodecContext avctx,
const AVPacket avpkt 
)
static

Definition at line 68 of file decode.c.

Referenced by ff_decode_get_packet().

static int extract_packet_props ( AVCodecInternal avci,
AVPacket pkt 
)
static

Definition at line 148 of file decode.c.

Referenced by avcodec_decode_subtitle2(), and ff_decode_get_packet().

static int unrefcount_frame ( AVCodecInternal avci,
AVFrame frame 
)
static

Definition at line 168 of file decode.c.

Referenced by compat_decode().

int ff_decode_bsfs_init ( AVCodecContext avctx)

Called during avcodec_open2() to initialize avctx->internal->bsf.

The bsf should be freed with av_bsf_free().

Definition at line 214 of file decode.c.

Referenced by avcodec_open2().

int ff_decode_get_packet ( AVCodecContext avctx,
AVPacket pkt 
)

Called by decoders to get the next packet for decoding.

Parameters
pktAn empty packet to be filled with data.
Returns
0 if a new reference has been successfully written to pkt AVERROR(EAGAIN) if no data is currently available AVERROR_EOF if and end of stream has been reached, so no more data will be available

Definition at line 248 of file decode.c.

Referenced by binkaudio_receive_frame(), crystalhd_receive_frame(), cuvid_output_frame(), decode_simple_internal(), libdav1d_receive_frame(), mediacodec_receive_frame(), and v4l2_receive_frame().

static int64_t guess_correct_pts ( AVCodecContext ctx,
int64_t  reordered_pts,
int64_t  dts 
)
static

Attempt to guess proper monotonic timestamps for decoded video frames which might have incorrect times.

Input timestamps may wrap around, in which case the output will as well.

Parameters
ptsthe pts field of the decoded AVPacket, as passed through AVFrame.pts
dtsthe dts field of the decoded AVPacket
Returns
one of the input values, may be AV_NOPTS_VALUE

Definition at line 289 of file decode.c.

Referenced by decode_simple_internal().

static int decode_simple_internal ( AVCodecContext avctx,
AVFrame frame 
)
inlinestatic

Definition at line 321 of file decode.c.

Referenced by decode_simple_receive_frame().

static int decode_simple_receive_frame ( AVCodecContext avctx,
AVFrame frame 
)
static

Definition at line 544 of file decode.c.

Referenced by decode_receive_frame_internal().

static int decode_receive_frame_internal ( AVCodecContext avctx,
AVFrame frame 
)
static

Definition at line 557 of file decode.c.

Referenced by avcodec_receive_frame(), and avcodec_send_packet().

static int apply_cropping ( AVCodecContext avctx,
AVFrame frame 
)
static

Definition at line 635 of file decode.c.

Referenced by avcodec_receive_frame().

static int compat_decode ( AVCodecContext avctx,
AVFrame frame,
int got_frame,
const AVPacket pkt 
)
static

Definition at line 738 of file decode.c.

Referenced by avcodec_decode_audio4(), and avcodec_decode_video2().

static void get_subtitle_defaults ( AVSubtitle sub)
static

Definition at line 834 of file decode.c.

Referenced by avcodec_decode_subtitle2().

static int recode_subtitle ( AVCodecContext avctx,
AVPacket outpkt,
const AVPacket inpkt 
)
static

Definition at line 841 of file decode.c.

Referenced by avcodec_decode_subtitle2().

static int utf8_check ( const uint8_t str)
static

Definition at line 899 of file decode.c.

Referenced by avcodec_decode_subtitle2().

static void insert_ts ( AVBPrint *  buf,
int  ts 
)
static

Definition at line 919 of file decode.c.

Referenced by convert_sub_to_old_ass_form().

static int convert_sub_to_old_ass_form ( AVSubtitle sub,
const AVPacket pkt,
AVRational  tb 
)
static

Definition at line 933 of file decode.c.

Referenced by avcodec_decode_subtitle2().

int ff_decode_get_hw_frames_ctx ( AVCodecContext avctx,
enum AVHWDeviceType  dev_type 
)

Make sure avctx.hw_frames_ctx is set.

If it's not set, the function will try to allocate it from hw_device_ctx. If that is not possible, an error message is printed, and an error code is returned.

Definition at line 1143 of file decode.c.

Referenced by ff_dxva2_decode_init(), ff_vaapi_decode_init(), and ff_vdpau_common_init().

static int hwaccel_init ( AVCodecContext avctx,
const AVCodecHWConfigInternal hw_config 
)
static

Definition at line 1243 of file decode.c.

Referenced by ff_get_format().

static void hwaccel_uninit ( AVCodecContext avctx)
static

Definition at line 1280 of file decode.c.

Referenced by ff_get_format().

int ff_get_format ( AVCodecContext avctx,
const enum AVPixelFormat fmt 
)

Select the (possibly hardware accelerated) pixel format.

This is a wrapper around AVCodecContext.get_format() and should be used instead of calling get_format() directly.

The list of pixel formats must contain at least one valid entry, and is terminated with AV_PIX_FMT_NONE. If it is possible to decode to software, the last entry in the list must be the most accurate software format. If it is not possible to decode to software, AVCodecContext.sw_pix_fmt must be set before calling this function.

Definition at line 1292 of file decode.c.

Referenced by cuvid_decode_init(), decode_init(), ff_mediacodec_dec_init(), ff_mjpeg_decode_sof(), ff_thread_get_format(), ffmmal_init_decoder(), get_pixel_format(), h263_get_format(), qsv_decode_preinit(), submit_packet(), and vc1_decode_init().

static void frame_pool_free ( void opaque,
uint8_t data 
)
static

Definition at line 1429 of file decode.c.

Referenced by frame_pool_alloc().

static AVBufferRef* frame_pool_alloc ( void  )
static

Definition at line 1440 of file decode.c.

Referenced by update_frame_pool().

static int update_frame_pool ( AVCodecContext avctx,
AVFrame frame 
)
static

Definition at line 1458 of file decode.c.

Referenced by avcodec_default_get_buffer2().

static int audio_get_buffer ( AVCodecContext avctx,
AVFrame frame 
)
static

Definition at line 1569 of file decode.c.

Referenced by avcodec_default_get_buffer2().

static int video_get_buffer ( AVCodecContext s,
AVFrame pic 
)
static

Definition at line 1614 of file decode.c.

Referenced by avcodec_default_get_buffer2().

static int add_metadata_from_side_data ( const AVPacket avpkt,
AVFrame frame 
)
static

Definition at line 1685 of file decode.c.

Referenced by ff_decode_frame_props().

int ff_decode_frame_props ( AVCodecContext avctx,
AVFrame frame 
)

Set various frame properties from the codec context / packet data.

Definition at line 1697 of file decode.c.

Referenced by cuvid_output_frame(), ff_get_buffer(), ff_qsv_get_continuous_buffer(), ffmal_copy_frame(), qtrle_decode_frame(), raw_decode(), reget_buffer_internal(), vpx_decode(), and wrapped_avframe_decode().

static void validate_avframe_allocation ( AVCodecContext avctx,
AVFrame frame 
)
static

Definition at line 1812 of file decode.c.

Referenced by ff_get_buffer().

static void decode_data_free ( void opaque,
uint8_t data 
)
static

Definition at line 1835 of file decode.c.

Referenced by ff_attach_decode_data().

int ff_attach_decode_data ( AVFrame frame)
int ff_get_buffer ( AVCodecContext avctx,
AVFrame frame,
int  flags 
)

Get a buffer for a frame.

This is a wrapper around AVCodecContext.get_buffer() and should be used instead calling get_buffer() directly.

Definition at line 1872 of file decode.c.

Referenced by ac3_decode_frame(), adpcm_decode_frame(), adx_decode_frame(), alloc_frame(), amrnb_decode_frame(), amrwb_decode_frame(), aom_decode(), ape_decode_frame(), aptx_decode_frame(), atrac1_decode_frame(), atrac3_decode_frame(), atrac3al_decode_frame(), atrac3p_decode_frame(), atrac9_decode_frame(), aura_decode_frame(), avui_decode_frame(), bfi_decode_frame(), binkaudio_receive_frame(), bitpacked_decode_yuv422p10(), bmp_decode_frame(), bmv_aud_decode_frame(), cdg_decode_frame(), cdxl_decode_frame(), cinaudio_decode_frame(), cmv_decode_frame(), cng_decode_frame(), cook_decode_frame(), copy_frame(), copy_output(), cuvid_output_frame(), cyuv_decode_frame(), dds_decode(), decode_frame(), decode_frame_common(), decode_pic(), decode_tag(), dfa_decode_frame(), dpcm_decode_frame(), dss_sp_decode_frame(), eightsvx_decode_frame(), escape124_decode_frame(), escape130_decode_frame(), evrc_decode_frame(), execute_code(), fastaudio_decode(), fdk_aac_decode_frame(), ff_dca_lbr_filter_frame(), ff_dca_xll_filter_frame(), ff_exp2fi(), ff_ivi_decode_frame(), ff_mjpeg_decode_sof(), ff_snow_common_init_after_header(), ff_snow_get_buffer(), ff_thread_get_buffer(), ff_twinvq_decode_frame(), ff_vp56_decode_frame(), ffat_decode(), ffmal_copy_frame(), filter_frame(), filter_frame_fixed(), filter_frame_float(), fits_decode_frame(), flush(), frame_configure_elements(), g2m_decode_frame(), g722_decode_frame(), g723_1_decode_frame(), g726_reset(), gdv_decode_frame(), get_buffer(), get_buffer_with_edge(), gif_decode_frame(), gsm_decode_frame(), hcom_decode(), hnm_decode_frame(), hq_decode_frame(), hqa_decode_frame(), idcin_decode_frame(), ilbc_decode_frame(), imc_decode_frame(), init_frames(), ipvideo_decode_frame(), libcelt_dec_decode(), libcodec2_decode(), libgsm_decode_frame(), libopus_decode(), librsvg_decode_frame(), libspeex_decode_frame(), m101_decode_frame(), mace_decode_frame(), mediacodec_wrap_sw_buffer(), mp_decode_frame(), mpc7_decode_frame(), mpc8_decode_frame(), mss2_decode_frame(), mvc_decode_frame(), mxpeg_decode_frame(), oggvorbis_decode_frame(), on2avc_decode_frame(), opus_decode_packet(), output_data(), paf_audio_decode(), pcm_bluray_decode_frame(), pcm_decode_frame(), pcm_dvd_decode_frame(), pcx_decode_frame(), pgx_decode_frame(), pix_decode_frame(), pnm_decode_frame(), predictor_calc_error(), ptx_decode_frame(), qcelp_decode_frame(), qdm2_decode_frame(), qdmc_decode_frame(), ra144_decode_frame(), ra288_decode_frame(), reget_buffer_internal(), rl2_decode_frame(), roq_encode_frame(), s302m_decode_frame(), sbc_decode_frame(), sgirle_decode_frame(), shorten_decode_frame(), sipr_decode_frame(), siren_decode(), smka_decode_frame(), speedhq_decode_frame(), submit_packet(), sunrast_decode_frame(), svc_decode_frame(), svq1_decode_frame(), svq1_encode_frame(), synth_superframe(), tdsc_decode_frame(), tgq_decode_frame(), tgv_decode_frame(), thread_get_buffer_internal(), tmv_decode_frame(), tqi_decode_frame(), truemotion2rt_decode_frame(), truespeech_decode_frame(), txd_decode_frame(), v308_decode_frame(), v408_decode_frame(), vcr1_decode_frame(), vmdaudio_decode_frame(), vmdvideo_decode_frame(), vorbis_decode_frame(), vpx_decode(), vqa_decode_frame(), wavesynth_decode(), wma_decode_superframe(), wmapro_decode_packet(), ws_snd_decode_frame(), xan_decode_frame(), xbm_decode_frame(), xface_decode_frame(), xma_decode_packet(), xpm_decode_frame(), xwd_decode_frame(), y216_decode_frame(), y41p_decode_frame(), yuv4_decode_frame(), zero12v_decode_frame(), and zerocodec_decode_frame().

static int reget_buffer_internal ( AVCodecContext avctx,
AVFrame frame,
int  flags 
)
static

Definition at line 1941 of file decode.c.

Referenced by ff_reget_buffer().

int ff_reget_buffer ( AVCodecContext avctx,
AVFrame frame,
int  flags 
)