359 lines
11 KiB
C
359 lines
11 KiB
C
/*****************************************************************************
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* flv.c: flv muxer
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*****************************************************************************
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* Copyright (C) 2009-2025 x264 project
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*
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* Authors: Kieran Kunhya <kieran@kunhya.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA.
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*
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* This program is also available under a commercial proprietary license.
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* For more information, contact us at licensing@x264.com.
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*****************************************************************************/
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#include "output.h"
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#include "flv_bytestream.h"
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#define CHECK(x)\
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do {\
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if( (x) < 0 )\
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return -1;\
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} while( 0 )
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typedef struct
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{
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flv_buffer *c;
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uint8_t *sei;
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int sei_len;
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int64_t i_fps_num;
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int64_t i_fps_den;
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int64_t i_framenum;
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uint64_t i_framerate_pos;
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uint64_t i_duration_pos;
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uint64_t i_filesize_pos;
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uint64_t i_bitrate_pos;
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uint8_t b_write_length;
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int64_t i_prev_dts;
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int64_t i_prev_cts;
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int64_t i_delay_time;
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int64_t i_init_delta;
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int i_delay_frames;
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double d_timebase;
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int b_vfr_input;
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int b_dts_compress;
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unsigned start;
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} flv_hnd_t;
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static int write_header( flv_buffer *c )
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{
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flv_put_tag( c, "FLV" ); // Signature
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flv_put_byte( c, 1 ); // Version
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flv_put_byte( c, 1 ); // Video Only
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flv_put_be32( c, 9 ); // DataOffset
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flv_put_be32( c, 0 ); // PreviousTagSize0
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return flv_flush_data( c );
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}
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static int open_file( char *psz_filename, hnd_t *p_handle, cli_output_opt_t *opt )
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{
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flv_hnd_t *p_flv = calloc( 1, sizeof(flv_hnd_t) );
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if( p_flv )
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{
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flv_buffer *c = flv_create_writer( psz_filename );
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if( c )
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{
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if( !write_header( c ) )
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{
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p_flv->c = c;
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p_flv->b_dts_compress = opt->use_dts_compress;
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*p_handle = p_flv;
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return 0;
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}
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fclose( c->fp );
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free( c->data );
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free( c );
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}
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free( p_flv );
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}
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*p_handle = NULL;
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return -1;
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}
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static int set_param( hnd_t handle, x264_param_t *p_param )
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{
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flv_hnd_t *p_flv = handle;
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flv_buffer *c = p_flv->c;
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flv_put_byte( c, FLV_TAG_TYPE_META ); // Tag Type "script data"
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int start = c->d_cur;
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flv_put_be24( c, 0 ); // data length
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flv_put_be24( c, 0 ); // timestamp
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flv_put_be32( c, 0 ); // reserved
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flv_put_byte( c, AMF_DATA_TYPE_STRING );
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flv_put_amf_string( c, "onMetaData" );
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flv_put_byte( c, AMF_DATA_TYPE_MIXEDARRAY );
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flv_put_be32( c, 7 );
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flv_put_amf_string( c, "width" );
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flv_put_amf_double( c, p_param->i_width );
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flv_put_amf_string( c, "height" );
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flv_put_amf_double( c, p_param->i_height );
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flv_put_amf_string( c, "framerate" );
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if( !p_param->b_vfr_input )
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flv_put_amf_double( c, (double)p_param->i_fps_num / p_param->i_fps_den );
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else
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{
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p_flv->i_framerate_pos = c->d_cur + c->d_total + 1;
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flv_put_amf_double( c, 0 ); // written at end of encoding
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}
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flv_put_amf_string( c, "videocodecid" );
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flv_put_amf_double( c, FLV_CODECID_H264 );
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flv_put_amf_string( c, "duration" );
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p_flv->i_duration_pos = c->d_cur + c->d_total + 1;
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flv_put_amf_double( c, 0 ); // written at end of encoding
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flv_put_amf_string( c, "filesize" );
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p_flv->i_filesize_pos = c->d_cur + c->d_total + 1;
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flv_put_amf_double( c, 0 ); // written at end of encoding
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flv_put_amf_string( c, "videodatarate" );
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p_flv->i_bitrate_pos = c->d_cur + c->d_total + 1;
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flv_put_amf_double( c, 0 ); // written at end of encoding
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flv_put_amf_string( c, "" );
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flv_put_byte( c, AMF_END_OF_OBJECT );
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unsigned length = c->d_cur - start;
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flv_rewrite_amf_be24( c, length - 10, start );
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flv_put_be32( c, length + 1 ); // tag length
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p_flv->i_fps_num = p_param->i_fps_num;
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p_flv->i_fps_den = p_param->i_fps_den;
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p_flv->d_timebase = (double)p_param->i_timebase_num / p_param->i_timebase_den;
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p_flv->b_vfr_input = p_param->b_vfr_input;
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p_flv->i_delay_frames = p_param->i_bframe ? (p_param->i_bframe_pyramid ? 2 : 1) : 0;
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return 0;
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}
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static int write_headers( hnd_t handle, x264_nal_t *p_nal )
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{
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flv_hnd_t *p_flv = handle;
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flv_buffer *c = p_flv->c;
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int sps_size = p_nal[0].i_payload;
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int pps_size = p_nal[1].i_payload;
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int sei_size = p_nal[2].i_payload;
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// SEI
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/* It is within the spec to write this as-is but for
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* mplayer/ffmpeg playback this is deferred until before the first frame */
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p_flv->sei = malloc( sei_size );
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if( !p_flv->sei )
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return -1;
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p_flv->sei_len = sei_size;
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memcpy( p_flv->sei, p_nal[2].p_payload, sei_size );
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// SPS
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uint8_t *sps = p_nal[0].p_payload + 4;
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flv_put_byte( c, FLV_TAG_TYPE_VIDEO );
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flv_put_be24( c, 0 ); // rewrite later
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flv_put_be24( c, 0 ); // timestamp
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flv_put_byte( c, 0 ); // timestamp extended
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flv_put_be24( c, 0 ); // StreamID - Always 0
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p_flv->start = c->d_cur; // needed for overwriting length
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flv_put_byte( c, FLV_FRAME_KEY | FLV_CODECID_H264 ); // FrameType and CodecID
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flv_put_byte( c, 0 ); // AVC sequence header
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flv_put_be24( c, 0 ); // composition time
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flv_put_byte( c, 1 ); // version
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flv_put_byte( c, sps[1] ); // profile
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flv_put_byte( c, sps[2] ); // profile
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flv_put_byte( c, sps[3] ); // level
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flv_put_byte( c, 0xff ); // 6 bits reserved (111111) + 2 bits nal size length - 1 (11)
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flv_put_byte( c, 0xe1 ); // 3 bits reserved (111) + 5 bits number of sps (00001)
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flv_put_be16( c, sps_size - 4 );
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flv_append_data( c, sps, sps_size - 4 );
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// PPS
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flv_put_byte( c, 1 ); // number of pps
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flv_put_be16( c, pps_size - 4 );
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flv_append_data( c, p_nal[1].p_payload + 4, pps_size - 4 );
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// rewrite data length info
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unsigned length = c->d_cur - p_flv->start;
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flv_rewrite_amf_be24( c, length, p_flv->start - 10 );
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flv_put_be32( c, length + 11 ); // Last tag size
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CHECK( flv_flush_data( c ) );
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return sei_size + sps_size + pps_size;
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}
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static int write_frame( hnd_t handle, uint8_t *p_nalu, int i_size, x264_picture_t *p_picture )
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{
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flv_hnd_t *p_flv = handle;
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flv_buffer *c = p_flv->c;
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#define convert_timebase_ms( timestamp, timebase ) (int64_t)((timestamp) * (timebase) * 1000 + 0.5)
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if( !p_flv->i_framenum )
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{
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p_flv->i_delay_time = p_picture->i_dts * -1;
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if( !p_flv->b_dts_compress && p_flv->i_delay_time )
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x264_cli_log( "flv", X264_LOG_INFO, "initial delay %"PRId64" ms\n",
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convert_timebase_ms( p_picture->i_pts + p_flv->i_delay_time, p_flv->d_timebase ) );
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}
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int64_t dts;
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int64_t cts;
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int64_t offset;
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if( p_flv->b_dts_compress )
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{
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if( p_flv->i_framenum == 1 )
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p_flv->i_init_delta = convert_timebase_ms( p_picture->i_dts + p_flv->i_delay_time, p_flv->d_timebase );
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dts = p_flv->i_framenum > p_flv->i_delay_frames
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? convert_timebase_ms( p_picture->i_dts, p_flv->d_timebase )
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: p_flv->i_framenum * p_flv->i_init_delta / (p_flv->i_delay_frames + 1);
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cts = convert_timebase_ms( p_picture->i_pts, p_flv->d_timebase );
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}
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else
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{
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dts = convert_timebase_ms( p_picture->i_dts + p_flv->i_delay_time, p_flv->d_timebase );
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cts = convert_timebase_ms( p_picture->i_pts + p_flv->i_delay_time, p_flv->d_timebase );
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}
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offset = cts - dts;
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if( p_flv->i_framenum )
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{
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if( p_flv->i_prev_dts == dts )
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x264_cli_log( "flv", X264_LOG_WARNING, "duplicate DTS %"PRId64" generated by rounding\n"
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" decoding framerate cannot exceed 1000fps\n", dts );
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if( p_flv->i_prev_cts == cts )
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x264_cli_log( "flv", X264_LOG_WARNING, "duplicate CTS %"PRId64" generated by rounding\n"
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" composition framerate cannot exceed 1000fps\n", cts );
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}
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p_flv->i_prev_dts = dts;
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p_flv->i_prev_cts = cts;
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// A new frame - write packet header
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flv_put_byte( c, FLV_TAG_TYPE_VIDEO );
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flv_put_be24( c, 0 ); // calculated later
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flv_put_be24( c, dts );
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flv_put_byte( c, dts >> 24 );
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flv_put_be24( c, 0 );
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p_flv->start = c->d_cur;
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flv_put_byte( c, (p_picture->b_keyframe ? FLV_FRAME_KEY : FLV_FRAME_INTER) | FLV_CODECID_H264 );
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flv_put_byte( c, 1 ); // AVC NALU
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flv_put_be24( c, offset );
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if( p_flv->sei )
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{
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flv_append_data( c, p_flv->sei, p_flv->sei_len );
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free( p_flv->sei );
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p_flv->sei = NULL;
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}
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flv_append_data( c, p_nalu, i_size );
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unsigned length = c->d_cur - p_flv->start;
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flv_rewrite_amf_be24( c, length, p_flv->start - 10 );
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flv_put_be32( c, 11 + length ); // Last tag size
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CHECK( flv_flush_data( c ) );
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p_flv->i_framenum++;
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return i_size;
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}
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static int rewrite_amf_double( FILE *fp, uint64_t position, double value )
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{
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uint64_t x = endian_fix64( flv_dbl2int( value ) );
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return !fseek( fp, position, SEEK_SET ) && fwrite( &x, 8, 1, fp ) == 1 ? 0 : -1;
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}
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#undef CHECK
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#define CHECK(x)\
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do {\
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if( (x) < 0 )\
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goto error;\
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} while( 0 )
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static int close_file( hnd_t handle, int64_t largest_pts, int64_t second_largest_pts )
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{
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int ret = -1;
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flv_hnd_t *p_flv = handle;
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flv_buffer *c = p_flv->c;
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CHECK( flv_flush_data( c ) );
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double total_duration;
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/* duration algorithm fails with one frame */
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if( p_flv->i_framenum == 1 )
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total_duration = p_flv->i_fps_num ? (double)p_flv->i_fps_den / p_flv->i_fps_num : 0;
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else
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total_duration = (2 * largest_pts - second_largest_pts) * p_flv->d_timebase;
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if( x264_is_regular_file( c->fp ) && total_duration > 0 )
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{
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double framerate;
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int64_t filesize = ftell( c->fp );
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if( p_flv->i_framerate_pos )
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{
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framerate = (double)p_flv->i_framenum / total_duration;
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CHECK( rewrite_amf_double( c->fp, p_flv->i_framerate_pos, framerate ) );
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}
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CHECK( rewrite_amf_double( c->fp, p_flv->i_duration_pos, total_duration ) );
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CHECK( rewrite_amf_double( c->fp, p_flv->i_filesize_pos, filesize ) );
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CHECK( rewrite_amf_double( c->fp, p_flv->i_bitrate_pos, filesize * 8.0 / ( total_duration * 1000 ) ) );
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}
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ret = 0;
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error:
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fclose( c->fp );
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free( c->data );
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free( c );
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free( p_flv );
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return ret;
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}
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const cli_output_t flv_output = { open_file, set_param, write_headers, write_frame, close_file };
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