/***************************************************************************** * vlc_codec.h: Definition of the decoder and encoder structures ***************************************************************************** * Copyright (C) 1999-2003 VLC authors and VideoLAN * $Id$ * * Authors: Gildas Bazin * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation; either version 2.1 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this program; if not, write to the Free Software Foundation, * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA. *****************************************************************************/ #ifndef VLC_CODEC_H #define VLC_CODEC_H 1 #include #include #include #include #include /** * \defgroup codec Codec * Decoders and encoders * @{ * \file * Decoder and encoder modules interface * * \defgroup decoder Decoder * Audio, video and text decoders * @{ */ typedef struct decoder_owner_sys_t decoder_owner_sys_t; typedef struct decoder_cc_desc_t decoder_cc_desc_t; /* * BIG FAT WARNING : the code relies in the first 4 members of filter_t * and decoder_t to be the same, so if you have anything to add, do it * at the end of the structure. */ struct decoder_t { VLC_COMMON_MEMBERS /* Module properties */ module_t * p_module; decoder_sys_t * p_sys; /* Input format ie from demuxer (XXX: a lot of field could be invalid) */ es_format_t fmt_in; /* Output format of decoder/packetizer */ es_format_t fmt_out; /* Tell the decoder if it is allowed to drop frames */ bool b_frame_drop_allowed; # define VLCDEC_SUCCESS VLC_SUCCESS # define VLCDEC_ECRITICAL VLC_EGENERIC # define VLCDEC_RELOAD (-100) /* This function is called to decode one packetized block. * * The module implementation will own the input block (p_block) and should * process and release it. Depending of the decoder type, the module should * send output frames/blocks via decoder_QueueVideo(), decoder_QueueAudio() * or decoder_QueueSub(). * * If p_block is NULL, the decoder asks the module to drain itself. The * module should return all available output frames/block via the queue * functions. * * Return values can be: * VLCDEC_SUCCESS: pf_decode will be called again * VLCDEC_ECRITICAL: in case of critical error, pf_decode won't be called * again. * VLCDEC_RELOAD: Request that the decoder should be reloaded. The current * module will be unloaded. Reloading a module may cause a loss of frames. * When returning this status, the implementation shouldn't release or * modify the p_block in argument (The same p_block will be feed to the * next decoder module). */ int ( * pf_decode ) ( decoder_t *, block_t *p_block ); /* This function is called in a loop with the same pp_block argument until * it returns NULL. This allows a module implementation to return more than * one output blocks for one input block. * * pp_block or *pp_block can be NULL. * * If pp_block and *pp_block are not NULL, the module implementation will * own the input block (*pp_block) and should process and release it. The * module can also process a part of the block. In that case, it should * modify (*pp_block)->p_buffer/i_buffer accordingly and return a valid * output block. The module can also set *pp_block to NULL when the input * block is consumed. * * If pp_block is not NULL but *pp_block is NULL, a previous call of the pf * function has set the *pp_block to NULL. Here, the module can return new * output block for the same, already processed, input block (the * pf_packetize function will be called as long as the module return an * output block). * * When the pf function returns NULL, the next call to this function will * have a new a valid pp_block (if the packetizer is not drained). * * If pp_block is NULL, the packetizer asks the module to drain itself. In * that case, the module has to return all output frames available (the * pf_packetize function will be called as long as the module return an * output block). */ block_t * ( * pf_packetize )( decoder_t *, block_t **pp_block ); /* */ void ( * pf_flush ) ( decoder_t * ); /* Closed Caption (CEA 608/708) extraction. * If set, it *may* be called after pf_packetize returned data. It should * return CC for the pictures returned by the last pf_packetize call only, * channel bitmaps will be used to known which cc channel are present (but * globaly, not necessary for the current packet. Video decoders should use * the decoder_QueueCc() function to pass closed captions. */ block_t * ( * pf_get_cc ) ( decoder_t *, decoder_cc_desc_t * ); /* Meta data at codec level * The decoder owner set it back to NULL once it has retreived what it needs. * The decoder owner is responsible of its release except when you overwrite it. */ vlc_meta_t *p_description; /* * Owner fields * XXX You MUST not use them directly. */ /* Video output callbacks * XXX use decoder_NewPicture */ int (*pf_vout_format_update)( decoder_t * ); picture_t *(*pf_vout_buffer_new)( decoder_t * ); /** * Number of extra (ie in addition to the DPB) picture buffers * needed for decoding. */ int i_extra_picture_buffers; /* Audio output callbacks */ int (*pf_aout_format_update)( decoder_t * ); /* SPU output callbacks * XXX use decoder_NewSubpicture */ subpicture_t *(*pf_spu_buffer_new)( decoder_t *, const subpicture_updater_t * ); /* Input attachments * XXX use decoder_GetInputAttachments */ int (*pf_get_attachments)( decoder_t *p_dec, input_attachment_t ***ppp_attachment, int *pi_attachment ); /* Display date * XXX use decoder_GetDisplayDate */ vlc_tick_t (*pf_get_display_date)( decoder_t *, vlc_tick_t ); /* Display rate * XXX use decoder_GetDisplayRate */ int (*pf_get_display_rate)( decoder_t * ); /* XXX use decoder_QueueVideo or decoder_QueueVideoWithCc */ int (*pf_queue_video)( decoder_t *, picture_t * ); /* XXX use decoder_QueueAudio */ int (*pf_queue_audio)( decoder_t *, block_t * ); /* XXX use decoder_QueueCC */ int (*pf_queue_cc)( decoder_t *, block_t *, const decoder_cc_desc_t * ); /* XXX use decoder_QueueSub */ int (*pf_queue_sub)( decoder_t *, subpicture_t *); void *p_queue_ctx; /* Private structure for the owner of the decoder */ decoder_owner_sys_t *p_owner; }; /* struct for packetizer get_cc polling/decoder queue_cc * until we have a proper metadata way */ struct decoder_cc_desc_t { uint8_t i_608_channels; /* 608 channels bitmap */ uint64_t i_708_channels; /* 708 */ int i_reorder_depth; /* reorder depth, -1 for no reorder, 0 for old P/B flag based */ }; /** * @} */ /** * \defgroup encoder Encoder * Audio, video and text encoders * @{ */ struct encoder_t { VLC_COMMON_MEMBERS /* Module properties */ module_t * p_module; encoder_sys_t * p_sys; /* Properties of the input data fed to the encoder */ es_format_t fmt_in; /* Properties of the output of the encoder */ es_format_t fmt_out; block_t * ( * pf_encode_video )( encoder_t *, picture_t * ); block_t * ( * pf_encode_audio )( encoder_t *, block_t * ); block_t * ( * pf_encode_sub )( encoder_t *, subpicture_t * ); /* Common encoder options */ int i_threads; /* Number of threads to use during encoding */ int i_iframes; /* One I frame per i_iframes */ int i_bframes; /* One B frame per i_bframes */ int i_tolerance; /* Bitrate tolerance */ /* Encoder config */ config_chain_t *p_cfg; }; /** * @} * * \ingroup decoder * @{ */ /** * Updates the video output format. * * This function notifies the video output pipeline of a new video output * format (fmt_out.video). If there was no video output from the decoder so far * or if the video output format has changed, a new video output will be set * up. decoder_NewPicture() can then be used to allocate picture buffers. * * If the format is unchanged, this function has no effects and returns zero. * * \note * This function is not reentrant. * * @return 0 if the video output was set up successfully, -1 otherwise. */ VLC_USED static inline int decoder_UpdateVideoFormat( decoder_t *dec ) { assert( dec->fmt_in.i_cat == VIDEO_ES ); if( dec->fmt_in.i_cat == VIDEO_ES && dec->pf_vout_format_update != NULL ) return dec->pf_vout_format_update( dec ); else return -1; } /** * Allocates an output picture buffer. * * This function pulls an output picture buffer for the decoder from the * buffer pool of the video output. The picture must be released with * picture_Release() when it is no longer referenced by the decoder. * * \note * This function is reentrant. However, decoder_UpdateVideoFormat() cannot be * used concurrently; the caller is responsible for serialization. * * \warning * The behaviour is undefined if decoder_UpdateVideoFormat() was not called or * if the last call returned an error. * * \return a picture buffer on success, NULL on error */ VLC_USED static inline picture_t *decoder_NewPicture( decoder_t *dec ) { return dec->pf_vout_buffer_new( dec ); } /** * Abort any calls of decoder_NewPicture * * If b_abort is true, all pending and futures calls of decoder_NewPicture * will be aborted. This function can be used by asynchronous video decoders * to unblock a thread that is waiting for a picture. */ VLC_API void decoder_AbortPictures( decoder_t *dec, bool b_abort ); /** * This function queues a single picture to the video output. * * \note * The caller doesn't own the picture anymore after this call (even in case of * error). * FIXME: input_DecoderFrameNext won't work if a module use this function. * * \return 0 if the picture is queued, -1 on error */ static inline int decoder_QueueVideo( decoder_t *dec, picture_t *p_pic ) { assert( p_pic->p_next == NULL ); assert( dec->pf_queue_video != NULL ); return dec->pf_queue_video( dec, p_pic ); } /** * This function queues the Closed Captions * * \param dec the decoder object * \param p_cc the closed-caption to queue * \param p_desc decoder_cc_desc_t description structure * \return 0 if queued, -1 on error */ static inline int decoder_QueueCc( decoder_t *dec, block_t *p_cc, const decoder_cc_desc_t *p_desc ) { if( dec->pf_queue_cc == NULL ) { block_Release( p_cc ); return -1; } return dec->pf_queue_cc( dec, p_cc, p_desc ); } /** * This function queues a single audio block to the audio output. * * \note * The caller doesn't own the audio block anymore after this call (even in case * of error). * * \return 0 if the block is queued, -1 on error */ static inline int decoder_QueueAudio( decoder_t *dec, block_t *p_aout_buf ) { assert( p_aout_buf->p_next == NULL ); assert( dec->pf_queue_audio != NULL ); return dec->pf_queue_audio( dec, p_aout_buf ); } /** * This function queues a single subtitle to the video output. * * \note * The caller doesn't own the subtitle anymore after this call (even in case of * error). * * \return 0 if the subtitle is queued, -1 on error */ static inline int decoder_QueueSub( decoder_t *dec, subpicture_t *p_spu ) { assert( p_spu->p_next == NULL ); assert( dec->pf_queue_sub != NULL ); return dec->pf_queue_sub( dec, p_spu ); } /** * This function notifies the audio output pipeline of a new audio output * format (fmt_out.audio). If there is currently no audio output or if the * audio output format has changed, a new audio output will be set up. * @return 0 if the audio output is working, -1 if not. */ VLC_USED static inline int decoder_UpdateAudioFormat( decoder_t *dec ) { assert(dec->fmt_in.i_cat == AUDIO_ES); if( dec->fmt_in.i_cat == AUDIO_ES && dec->pf_aout_format_update != NULL ) return dec->pf_aout_format_update( dec ); else return -1; } /** * This function will return a new audio buffer usable by a decoder as an * output buffer. It must be released with block_Release() or returned it to * the caller as a decoder_QueueAudio parameter. */ VLC_API block_t * decoder_NewAudioBuffer( decoder_t *, int i_nb_samples ) VLC_USED; /** * This function will return a new subpicture usable by a decoder as an output * buffer. You have to release it using subpicture_Delete() or by returning * it to the caller as a decoder_QueueSub parameter. */ VLC_API subpicture_t * decoder_NewSubpicture( decoder_t *, const subpicture_updater_t * ) VLC_USED; /** * This function gives all input attachments at once. * * You MUST release the returned values */ VLC_API int decoder_GetInputAttachments( decoder_t *, input_attachment_t ***ppp_attachment, int *pi_attachment ); /** * This function converts a decoder timestamp into a display date comparable * to mdate(). * You MUST use it *only* for gathering statistics about speed. */ VLC_API vlc_tick_t decoder_GetDisplayDate( decoder_t *, vlc_tick_t ) VLC_USED; /** * This function returns the current input rate. * You MUST use it *only* for gathering statistics about speed. */ VLC_API int decoder_GetDisplayRate( decoder_t * ) VLC_USED; /** @} */ /** @} */ #endif /* _VLC_CODEC_H */