mirror of https://git.ffmpeg.org/ffmpeg.git
74 lines
3.3 KiB
C
74 lines
3.3 KiB
C
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/*
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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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