FFmpeg
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/channel_layout.h"
#include "libavutil/common.h"
#include "libavutil/fifo.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 "bsf.h"
#include "codec_internal.h"
#include "decode.h"
#include "hwconfig.h"
#include "internal.h"
#include "thread.h"

Go to the source code of this file.

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 copy_packet_props (AVPacket *dst, const AVPacket *src)
 
static int extract_packet_props (AVCodecInternal *avci, const AVPacket *pkt)
 
static int decode_bsfs_init (AVCodecContext *avctx)
 
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, int64_t *discarded_samples)
 
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 void get_subtitle_defaults (AVSubtitle *sub)
 
static int recode_subtitle (AVCodecContext *avctx, AVPacket **outpkt, AVPacket *inpkt, AVPacket *buf_pkt)
 
static int utf8_check (const uint8_t *str)
 
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 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...
 
int ff_decode_preinit (AVCodecContext *avctx)
 Perform decoder initialization and validation. More...
 
int ff_copy_palette (void *dst, const AVPacket *src, void *logctx)
 Check whether the side-data of src contains a palette of size AVPALETTE_SIZE; if so, copy it to dst and return 1; else return 0. More...
 

Macro Definition Documentation

◆ IS_EMPTY

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

Definition at line 135 of file decode.c.

◆ UTF8_MAX_BYTES

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

Definition at line 735 of file decode.c.

Function Documentation

◆ apply_param_change()

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

Definition at line 52 of file decode.c.

Referenced by ff_decode_get_packet().

◆ copy_packet_props()

static int copy_packet_props ( AVPacket dst,
const AVPacket src 
)
static

Definition at line 137 of file decode.c.

Referenced by extract_packet_props().

◆ extract_packet_props()

static int extract_packet_props ( AVCodecInternal avci,
const AVPacket pkt 
)
static

Definition at line 149 of file decode.c.

Referenced by ff_decode_get_packet().

◆ decode_bsfs_init()

static int decode_bsfs_init ( AVCodecContext avctx)
static

Definition at line 170 of file decode.c.

Referenced by ff_decode_preinit().

◆ ff_decode_get_packet()

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 205 of file decode.c.

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

◆ guess_correct_pts()

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 245 of file decode.c.

Referenced by decode_receive_frame_internal().

◆ decode_simple_internal()

static int decode_simple_internal ( AVCodecContext avctx,
AVFrame frame,
int64_t *  discarded_samples 
)
inlinestatic

Definition at line 277 of file decode.c.

Referenced by decode_simple_receive_frame().

◆ decode_simple_receive_frame()

static int decode_simple_receive_frame ( AVCodecContext avctx,
AVFrame frame 
)
static

Definition at line 507 of file decode.c.

Referenced by decode_receive_frame_internal().

◆ decode_receive_frame_internal()

static int decode_receive_frame_internal ( AVCodecContext avctx,
AVFrame frame 
)
static

Definition at line 523 of file decode.c.

Referenced by avcodec_receive_frame(), and avcodec_send_packet().

◆ apply_cropping()

static int apply_cropping ( AVCodecContext avctx,
AVFrame frame 
)
static

Definition at line 612 of file decode.c.

Referenced by avcodec_receive_frame().

◆ get_subtitle_defaults()

static void get_subtitle_defaults ( AVSubtitle sub)
static

Definition at line 729 of file decode.c.

Referenced by avcodec_decode_subtitle2().

◆ recode_subtitle()

static int recode_subtitle ( AVCodecContext avctx,
AVPacket **  outpkt,
AVPacket inpkt,
AVPacket buf_pkt 
)
static

Definition at line 736 of file decode.c.

Referenced by avcodec_decode_subtitle2().

◆ utf8_check()

static int utf8_check ( const uint8_t *  str)
static

Definition at line 797 of file decode.c.

Referenced by avcodec_decode_subtitle2().

◆ ff_decode_get_hw_frames_ctx()

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 951 of file decode.c.

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

◆ hwaccel_init()

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

Definition at line 1051 of file decode.c.

Referenced by ff_get_format().

◆ hwaccel_uninit()

static void hwaccel_uninit ( AVCodecContext avctx)
static

Definition at line 1088 of file decode.c.

Referenced by ff_get_format().

◆ 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 1100 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().

◆ add_metadata_from_side_data()

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

Definition at line 1235 of file decode.c.

Referenced by ff_decode_frame_props().

◆ ff_decode_frame_props()

int ff_decode_frame_props ( AVCodecContext avctx,
AVFrame frame 
)

◆ validate_avframe_allocation()

static void validate_avframe_allocation ( AVCodecContext avctx,
AVFrame frame 
)
static

Definition at line 1345 of file decode.c.

Referenced by ff_get_buffer().

◆ decode_data_free()

static void decode_data_free ( void *  opaque,
uint8_t *  data 
)
static

Definition at line 1366 of file decode.c.

Referenced by ff_attach_decode_data().

◆ ff_attach_decode_data()

int ff_attach_decode_data ( AVFrame frame)

◆ ff_get_buffer()

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 1403 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(), 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_pic(), decode_tag(), dfa_decode_frame(), dfpwm_dec_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_ivi_decode_frame(), ff_mjpeg_decode_sof(), ff_snow_common_init_after_header(), ff_snow_get_buffer(), ff_thread_get_buffer(), ff_thread_get_ext_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(), frame_configure_elements(), g2m_decode_frame(), g722_decode_frame(), g723_1_decode_frame(), gdv_decode_frame(), gem_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(), ipu_decode_frame(), ipvideo_decode_frame(), libcelt_dec_decode(), libcodec2_decode(), libgsm_decode_frame(), libjxl_decode_frame(), libopus_decode(), librsvg_decode_frame(), libspeex_decode_frame(), libuavs3d_decode_frame(), m101_decode_frame(), mace_decode_frame(), mediacodec_wrap_sw_buffer(), mp_decode_frame(), mpc7_decode_frame(), mpc8_decode_frame(), msp2_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(), ptx_decode_frame(), qcelp_decode_frame(), qdm2_decode_frame(), qdmc_decode_frame(), ra144_decode_frame(), ra288_decode_frame(), reget_buffer_internal(), rl2_decode_frame(), s302m_decode_frame(), sbc_decode_frame(), sga_decode_frame(), sgirle_decode_frame(), shorten_decode_frame(), sipr_decode_frame(), siren_decode(), smka_decode_frame(), speex_decode_frame(), submit_packet(), sunrast_decode_frame(), svc_decode_frame(), svq1_decode_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(), vbn_decode_frame(), vcr1_decode_frame(), vmdaudio_decode_frame(), vmdvideo_decode_frame(), vorbis_decode_frame(), vpx_decode(), 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().

◆ reget_buffer_internal()

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

Definition at line 1484 of file decode.c.

Referenced by ff_reget_buffer().

◆ ff_reget_buffer()

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

◆ ff_decode_preinit()

int ff_decode_preinit ( AVCodecContext avctx)

Perform decoder initialization and validation.

Called when opening the decoder, before the FFCodec.init() call.

Definition at line 1529 of file decode.c.

Referenced by avcodec_open2().

◆ ff_copy_palette()

int ff_copy_palette ( void *  dst,
const AVPacket src,
void *  logctx 
)

Check whether the side-data of src contains a palette of size AVPALETTE_SIZE; if so, copy it to dst and return 1; else return 0.

Also emit an error message upon encountering a palette with invalid size.

Definition at line 1624 of file decode.c.

Referenced by cinepak_decode_frame(), decode_frame(), gdv_decode_frame(), idcin_decode_frame(), imx_decode_frame(), ipvideo_decode_frame(), msrle_decode_frame(), msvideo1_decode_frame(), qtrle_decode_frame(), raw_decode(), rscc_decode_frame(), and smc_decode_frame().