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73 lines
3.3 KiB
73 lines
3.3 KiB
/* |
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* DV format muxer/demuxer |
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* Copyright (c) 2003 Roman Shaposhnik |
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* |
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* Many thanks to Dan Dennedy <dan@dennedy.org> for providing wealth |
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* of DV technical info, and SMPTE 314M specification. |
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* |
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* This library is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2 of the License, or (at your option) any later version. |
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* |
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* This library is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with this library; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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#include <time.h> |
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#include "avformat.h" |
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/* |
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* DVprofile is used to express the differences between various |
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* DV flavors. For now it's primarily used for differentiating |
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* 525/60 and 625/50, but the plans are to use it for various |
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* DV specs as well (e.g. SMPTE314M vs. IEC 61834). |
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*/ |
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typedef struct DVprofile { |
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int dsf; /* value of the dsf in the DV header */ |
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int frame_size; /* total size of one frame in bytes */ |
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int difseg_size; /* number of DIF segments */ |
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int frame_rate; |
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int frame_rate_base; |
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int ltc_divisor; /* FPS from the LTS standpoint */ |
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int height; /* picture height in pixels */ |
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uint16_t *video_place; /* positions of all DV macro blocks */ |
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int audio_stride; /* size of audio_shuffle table */ |
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int audio_min_samples[3]; /* min ammount of audio samples */ |
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/* for 48Khz, 44.1Khz and 32Khz */ |
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int audio_samples_dist[5];/* how many samples are supposed to be */ |
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/* in each frame in a 5 frames window */ |
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const uint16_t (*audio_shuffle)[9]; /* PCM shuffling table */ |
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} DVprofile; |
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typedef struct DVMuxContext { |
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const DVprofile* sys; /* Current DV profile. E.g.: 525/60, 625/50 */ |
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uint8_t frame_buf[144000]; /* frame under contruction */ |
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FifoBuffer audio_data; /* Fifo for storing excessive amounts of PCM */ |
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int frames; /* Number of a current frame */ |
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time_t start_time; /* Start time of recording */ |
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uint8_t aspect; /* Aspect ID 0 - 4:3, 7 - 16:9 */ |
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int ast, vst; /* Audio and Video stream indecies */ |
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int has_audio; /* frame under contruction has audio */ |
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int has_video; /* frame under contruction has video */ |
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} DVMuxContext; |
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void dv_format_frame(DVMuxContext *, uint8_t*); |
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void dv_inject_audio(DVMuxContext *, uint8_t*, uint8_t*); |
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void dv_inject_video(DVMuxContext *, uint8_t*, uint8_t*); |
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int dv_extract_audio(uint8_t*, uint8_t*, AVCodecContext*); |
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int dv_audio_frame_size(const DVprofile*, int); |
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void dv_assemble_frame(DVMuxContext *, uint8_t*, uint8_t*, int); |
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int dv_core_init(DVMuxContext *, AVStream*[]); |
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void dv_core_delete(DVMuxContext *); |
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const DVprofile* dv_frame_profile(uint8_t*);
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