@ -88,6 +88,27 @@ struct AVCodecContext;
struct AVSubtitle ;
struct AVPacket ;
enum FFCodecType {
/* The codec is a decoder using the decode callback;
* audio and video codecs only . */
FF_CODEC_CB_TYPE_DECODE ,
/* The codec is a decoder using the decode_sub callback;
* subtitle codecs only . */
FF_CODEC_CB_TYPE_DECODE_SUB ,
/* The codec is a decoder using the receive_frame callback;
* audio and video codecs only . */
FF_CODEC_CB_TYPE_RECEIVE_FRAME ,
/* The codec is an encoder using the encode callback;
* audio and video codecs only . */
FF_CODEC_CB_TYPE_ENCODE ,
/* The codec is an encoder using the encode_sub callback;
* subtitle codecs only . */
FF_CODEC_CB_TYPE_ENCODE_SUB ,
/* The codec is an encoder using the receive_packet callback;
* audio and video codecs only . */
FF_CODEC_CB_TYPE_RECEIVE_PACKET ,
} ;
typedef struct FFCodec {
/**
* The public AVCodec . See codec . h for it .
@ -97,7 +118,14 @@ typedef struct FFCodec {
/**
* Internal codec capabilities FF_CODEC_CAP_ * .
*/
int caps_internal ;
unsigned caps_internal : 29 ;
/**
* This field determines the type of the codec ( decoder / encoder )
* and also the exact callback cb implemented by the codec .
* cb_type uses enum FFCodecType values .
*/
unsigned cb_type : 3 ;
int priv_data_size ;
/**
@ -133,53 +161,69 @@ typedef struct FFCodec {
void ( * init_static_data ) ( struct FFCodec * codec ) ;
int ( * init ) ( struct AVCodecContext * ) ;
int ( * encode_sub ) ( struct AVCodecContext * , uint8_t * buf , int buf_size ,
const struct AVSubtitle * sub ) ;
/**
* Encode data to an AVPacket .
*
* @ param avctx codec context
* @ param avpkt output AVPacket
* @ param [ in ] frame AVFrame containing the raw data to be encoded
* @ param [ out ] got_packet_ptr encoder sets to 0 or 1 to indicate that a
* non - empty packet was returned in avpkt .
* @ return 0 on success , negative error code on failure
*/
int ( * encode2 ) ( struct AVCodecContext * avctx , struct AVPacket * avpkt ,
const struct AVFrame * frame , int * got_packet_ptr ) ;
/**
* Decode to an AVFrame .
*
* @ param avctx codec context
* @ param frame AVFrame for output
* @ param [ out ] got_frame_ptr decoder sets to 0 or 1 to indicate that a
* non - empty frame was returned in outdata .
* @ param [ in ] avpkt AVPacket containing the data to be decoded
* @ return amount of bytes read from the packet on success , negative error
* code on failure
*/
int ( * decode ) ( struct AVCodecContext * avctx , struct AVFrame * frame ,
int * got_frame_ptr , struct AVPacket * avpkt ) ;
/**
* Decode subtitle data . Same as decode except that it uses
* a struct AVSubtitle structure for output .
*/
int ( * decode_sub ) ( struct AVCodecContext * avctx , struct AVSubtitle * sub ,
union {
/**
* Decode to an AVFrame .
* cb is in this state if cb_type is FF_CODEC_CB_TYPE_DECODE .
*
* @ param avctx codec context
* @ param [ out ] frame AVFrame for output
* @ param [ out ] got_frame_ptr decoder sets to 0 or 1 to indicate that
* a non - empty frame was returned in frame .
* @ param [ in ] avpkt AVPacket containing the data to be decoded
* @ return amount of bytes read from the packet on success ,
* negative error code on failure
*/
int ( * decode ) ( struct AVCodecContext * avctx , struct AVFrame * frame ,
int * got_frame_ptr , struct AVPacket * avpkt ) ;
/**
* Decode subtitle data to an AVSubtitle .
* cb is in this state if cb_type is FF_CODEC_CB_TYPE_DECODE_SUB .
*
* Apart from that this is like the decode callback .
*/
int ( * decode_sub ) ( struct AVCodecContext * avctx , struct AVSubtitle * sub ,
int * got_frame_ptr , struct AVPacket * avpkt ) ;
/**
* Decode API with decoupled packet / frame dataflow .
* cb is in this state if cb_type is FF_CODEC_CB_TYPE_RECEIVE_FRAME .
*
* This function is called to get one output frame . It should call
* ff_decode_get_packet ( ) to obtain input data .
*/
int ( * receive_frame ) ( struct AVCodecContext * avctx , struct AVFrame * frame ) ;
/**
* Encode data to an AVPacket .
* cb is in this state if cb_type is FF_CODEC_CB_TYPE_ENCODE
*
* @ param avctx codec context
* @ param [ out ] avpkt output AVPacket
* @ param [ in ] frame AVFrame containing the input to be encoded
* @ param [ out ] got_packet_ptr encoder sets to 0 or 1 to indicate that a
* non - empty packet was returned in avpkt .
* @ return 0 on success , negative error code on failure
*/
int ( * encode ) ( struct AVCodecContext * avctx , struct AVPacket * avpkt ,
const struct AVFrame * frame , int * got_packet_ptr ) ;
/**
* Encode subtitles to a raw buffer .
* cb is in this state if cb_type is FF_CODEC_CB_TYPE_ENCODE_SUB .
*/
int ( * encode_sub ) ( struct AVCodecContext * avctx , uint8_t * buf ,
int buf_size , const struct AVSubtitle * sub ) ;
/**
* Encode API with decoupled frame / packet dataflow .
* cb is in this state if cb_type is FF_CODEC_CB_TYPE_RECEIVE_PACKET .
*
* This function is called to get one output packet .
* It should call ff_encode_get_frame ( ) to obtain input data .
*/
int ( * receive_packet ) ( struct AVCodecContext * avctx , struct AVPacket * avpkt ) ;
} cb ;
int ( * close ) ( struct AVCodecContext * ) ;
/**
* Encode API with decoupled frame / packet dataflow . This function is called
* to get one output packet . It should call ff_encode_get_frame ( ) to obtain
* input data .
*/
int ( * receive_packet ) ( struct AVCodecContext * avctx , struct AVPacket * avpkt ) ;
/**
* Decode API with decoupled packet / frame dataflow . This function is called
* to get one output frame . It should call ff_decode_get_packet ( ) to obtain
* input data .
*/
int ( * receive_frame ) ( struct AVCodecContext * avctx , struct AVFrame * frame ) ;
/**
* Flush buffers .
* Will be called when seeking
@ -207,6 +251,25 @@ typedef struct FFCodec {
const uint32_t * codec_tags ;
} FFCodec ;
# define FF_CODEC_DECODE_CB(func) \
. cb_type = FF_CODEC_CB_TYPE_DECODE , \
. cb . decode = ( func )
# define FF_CODEC_DECODE_SUB_CB(func) \
. cb_type = FF_CODEC_CB_TYPE_DECODE_SUB , \
. cb . decode_sub = ( func )
# define FF_CODEC_RECEIVE_FRAME_CB(func) \
. cb_type = FF_CODEC_CB_TYPE_RECEIVE_FRAME , \
. cb . receive_frame = ( func )
# define FF_CODEC_ENCODE_CB(func) \
. cb_type = FF_CODEC_CB_TYPE_ENCODE , \
. cb . encode = ( func )
# define FF_CODEC_ENCODE_SUB_CB(func) \
. cb_type = FF_CODEC_CB_TYPE_ENCODE_SUB , \
. cb . encode_sub = ( func )
# define FF_CODEC_RECEIVE_PACKET_CB(func) \
. cb_type = FF_CODEC_CB_TYPE_RECEIVE_PACKET , \
. cb . receive_packet = ( func )
static av_always_inline const FFCodec * ffcodec ( const AVCodec * codec )
{
return ( const FFCodec * ) codec ;
Andreas Rheinhardt
3 years ago