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video.c
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/* hacktv - Analogue video transmitter for the HackRF */
/*=======================================================================*/
/* Copyright 2017 Philip Heron <[email protected]> */
/* */
/* This program is free software: you can redistribute it and/or modify */
/* it under the terms of the GNU General Public License as published by */
/* the Free Software Foundation, either version 3 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 General Public License for more details. */
/* */
/* You should have received a copy of the GNU General Public License */
/* along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "video.h"
#include "hacktv.h"
/*
* Video generation
*
* The output from this encoder is a 16-bit IQ signal which
* hopefully contains an accurate video and audio signal for
* display on old analogue TV sets.
*
* The encoder makes liberal use of lookup tables:
*
* - 3x for RGB > gamma corrected Y, I and Q levels.
*
* - A temporary gamma table used while generating the above.
*
* - PAL colour carrier (4 full frames in length + 1 line) or
* NTSC colour carrier (2 full lines + 1 line).
*
* - Mono audio carrier. The length of this is calculated
* so that the full int16_t range provides the required
* frequency deviation.
*/
const vid_config_t vid_config_pal_i = {
/* System I (PAL) */
.output_type = HACKTV_INT16_COMPLEX,
.modulation = VID_VSB,
.vsb_upper_bw = 5500000, /* Hz */
.vsb_lower_bw = 1250000, /* Hz */
.level = 1.0, /* Overall signal level */
.video_level = 0.71, /* Power level of video */
.fm_audio_level = 0.22, /* FM audio carrier power level */
.nicam_level = 0.07, /* NICAM audio carrier power level */
.frame_rate_num = 25,
.frame_rate_den = 1,
.lines = 625,
.active_lines = 576,
.active_width = 0.00005195, /* 51.95µs */
.active_left = 0.00001040, /* |-->| 10.40µs */
.hsync_width = 0.00000470, /* 4.70 ±0.20µs */
.vsync_short_width = 0.00000235, /* 2.35 ±0.10µs */
.vsync_long_width = 0.00002730, /* 2.73 ±0.20µs */
.white_level = 0.20,
.black_level = 0.76,
.blanking_level = 0.76,
.sync_level = 1.00,
.colour_mode = VID_PAL,
.burst_width = 0.00000225, /* 2.25 ±0.23µs */
.burst_left = 0.00000560, /* |-->| 5.6 ±0.1µs */
.burst_level = 3.0 / 7.0, /* 3 / 7 of white - blanking level */
.colour_carrier = 4433618.75,
.colour_lookup_lines = 625 * 4, /* The carrier repeats after 4 frames */
.gamma = 1.4, /* 2.8 in spec? too bright */
.rw_co = 0.299, /* R weight */
.gw_co = 0.587, /* G weight */
.bw_co = 0.114, /* B weight */
.iu_co = 0.000,
.iv_co = 0.877,
.qu_co = 0.493,
.qv_co = 0.000,
.fm_mono_carrier = 6000000 - 400, /* Hz */
.fm_audio_preemph = 0.000050, /* Seconds */
.fm_audio_deviation = 50000, /* +/- Hz */
.nicam_carrier = 6552000, /* Hz */
};
const vid_config_t vid_config_pal_bg = {
/* System B/G (PAL) */
.output_type = HACKTV_INT16_COMPLEX,
.modulation = VID_VSB,
.vsb_upper_bw = 5000000, /* Hz */
.vsb_lower_bw = 750000, /* Hz */
.level = 1.0, /* Overall signal level */
.video_level = 0.71, /* Power level of video */
.fm_audio_level = 0.22, /* FM audio carrier power level */
.nicam_level = 0.07, /* NICAM audio carrier power level */
.frame_rate_num = 25,
.frame_rate_den = 1,
.lines = 625,
.active_lines = 576,
.active_width = 0.00005195, /* 51.95µs */
.active_left = 0.00001040, /* |-->| 10.40µs */
.hsync_width = 0.00000470, /* 4.70 ±0.20µs */
.vsync_short_width = 0.00000235, /* 2.35 ±0.10µs */
.vsync_long_width = 0.00002730, /* 2.73 ±0.20µs */
.white_level = 0.20,
.black_level = 0.76,
.blanking_level = 0.76,
.sync_level = 1.00,
.colour_mode = VID_PAL,
.burst_width = 0.00000225, /* 2.25 ±0.23µs */
.burst_left = 0.00000560, /* |-->| 5.6 ±0.1µs */
.burst_level = 3.0 / 7.0, /* 3 / 7 of white - blanking level */
.colour_carrier = 4433618.75,
.colour_lookup_lines = 625 * 4, /* The carrier repeats after 4 frames */
.gamma = 1.4, /* 2.8 in spec? too bright */
.rw_co = 0.299, /* R weight */
.gw_co = 0.587, /* G weight */
.bw_co = 0.114, /* B weight */
.iu_co = 0.000,
.iv_co = 0.877,
.qu_co = 0.493,
.qv_co = 0.000,
.fm_mono_carrier = 5500000, /* Hz */
.fm_audio_preemph = 0.000050, /* Seconds */
.fm_audio_deviation = 50000, /* +/- Hz */
.nicam_carrier = 5850000, /* Hz */
};
const vid_config_t vid_config_pal_fm = {
/* PAL FM (satellite) */
.output_type = HACKTV_INT16_COMPLEX,
.modulation = VID_FM,
.fm_level = 1.0,
.fm_deviation = 16000000, /* kHz */
.level = 1.0, /* Overall signal level */
.video_level = 0.92, /* Power level of video */
.fm_audio_level = 0.08, /* FM audio carrier power level */
.frame_rate_num = 25,
.frame_rate_den = 1,
.lines = 625,
.active_lines = 576,
.active_width = 0.00005195, /* 51.95µs */
.active_left = 0.00001040, /* |-->| 10.40µs */
.hsync_width = 0.00000470, /* 4.70 ±0.20µs */
.vsync_short_width = 0.00000235, /* 2.35 ±0.10µs */
.vsync_long_width = 0.00002730, /* 2.73 ±0.20µs */
.white_level = 1.00,
.black_level = -0.40,
.blanking_level = -0.40,
.sync_level = -1.00,
.colour_mode = VID_PAL,
.burst_width = 0.00000225, /* 2.25 ±0.23µs */
.burst_left = 0.00000560, /* |-->| 5.6 ±0.1µs */
.burst_level = 3.0 / 7.0, /* 3 / 7 of white - blanking level */
.colour_carrier = 4433618.75,
.colour_lookup_lines = 625 * 4, /* The carrier repeats after 4 frames */
.gamma = 1.4,
.rw_co = 0.299, /* R weight */
.gw_co = 0.587, /* G weight */
.bw_co = 0.114, /* B weight */
.iu_co = 0.000,
.iv_co = 0.877,
.qu_co = 0.493,
.qv_co = 0.000,
.fm_mono_carrier = 6500000, /* Hz */
//.fm_left_carrier = 7200000, /* Hz */
//.fm_right_carrier = 7020000, /* Hz */
.fm_audio_preemph = 0.000050, /* Seconds */
.fm_audio_deviation = 85000, /* +/- Hz */
};
const vid_config_t vid_config_pal = {
/* Composite PAL */
.output_type = HACKTV_INT16_REAL,
.level = 1.0, /* Overall signal level */
.video_level = 1.0, /* Power level of video */
.frame_rate_num = 25,
.frame_rate_den = 1,
.lines = 625,
.active_lines = 576,
.active_width = 0.00005195, /* 51.95µs */
.active_left = 0.00001040, /* |-->| 10.40µs */
.hsync_width = 0.00000470, /* 4.70 ±0.20µs */
.vsync_short_width = 0.00000235, /* 2.35 ±0.10µs */
.vsync_long_width = 0.00002730, /* 2.73 ±0.20µs */
.white_level = 0.70,
.black_level = 0.00,
.blanking_level = 0.00,
.sync_level = -0.30,
.colour_mode = VID_PAL,
.burst_width = 0.00000225, /* 2.25 ±0.23µs */
.burst_left = 0.00000560, /* |-->| 5.6 ±0.1µs */
.burst_level = 3.0 / 7.0, /* 3 / 7 of white - blanking level */
.colour_carrier = 4433618.75,
.colour_lookup_lines = 625 * 4, /* The carrier repeats after 4 frames */
.gamma = 1.4, /* 2.8 in spec? too bright */
.rw_co = 0.299, /* R weight */
.gw_co = 0.587, /* G weight */
.bw_co = 0.114, /* B weight */
.iu_co = 0.000,
.iv_co = 0.877,
.qu_co = 0.493,
.qv_co = 0.000,
};
const vid_config_t vid_config_ntsc_m = {
/* System M (NTSC) */
.output_type = HACKTV_INT16_COMPLEX,
.modulation = VID_VSB,
.vsb_upper_bw = 4200000, /* Hz */
.vsb_lower_bw = 750000, /* Hz */
.level = 1.0, /* Overall signal level */
.video_level = 0.83, /* Power level of video */
.fm_audio_level = 0.17, /* FM audio carrier power level */
.frame_rate_num = 30000,
.frame_rate_den = 1001,
.lines = 525,
.active_lines = 480,
.active_width = 0.00005290, /* 52.90µs */
.active_left = 0.00000920, /* |-->| 9.20µs */
.hsync_width = 0.00000470, /* 4.70 ±1.00µs */
.vsync_short_width = 0.00000230, /* 2.30 ±0.10µs */
.vsync_long_width = 0.00002710, /* 2.71 */
.white_level = 0.2000,
.black_level = 0.7280,
.blanking_level = 0.7712,
.sync_level = 1.0000,
.colour_mode = VID_NTSC,
.burst_width = 0.00000250, /* 2.5 ±0.28µs */
.burst_left = 0.00000530, /* |-->| 5.3 ±0.1µs */
.burst_level = 4.0 / 10.0, /* 4/10 of white - blanking level */
.colour_carrier = 5000000.0 * 63 / 88,
.colour_lookup_lines = 2, /* The carrier repeats after 2 lines */
.gamma = 1.2,
.rw_co = 0.299, /* R weight */
.gw_co = 0.587, /* G weight */
.bw_co = 0.114, /* B weight */
.iu_co = 0.269,
.iv_co = 0.736,
.qu_co = 0.413,
.qv_co = -0.478,
.fm_mono_carrier = 4500000, /* Hz */
.fm_audio_preemph = 0.000075, /* Seconds */
.fm_audio_deviation = 25000, /* +/- Hz */
};
const vid_config_t vid_config_ntsc = {
/* Composite NTSC */
.output_type = HACKTV_INT16_REAL,
.level = 1.0, /* Overall signal level */
.video_level = 1.0, /* Power level of video */
.frame_rate_num = 30000,
.frame_rate_den = 1001,
.lines = 525,
.active_lines = 480,
.active_width = 0.00005290, /* 52.90µs */
.active_left = 0.00000920, /* |-->| 9.20µs */
.hsync_width = 0.00000470, /* 4.70 ±1.00µs */
.vsync_short_width = 0.00000230, /* 2.30 ±0.10µs */
.vsync_long_width = 0.00002710, /* 2.71 */
.white_level = 0.2000,
.black_level = 0.7280,
.blanking_level = 0.7712,
.sync_level = 1.0000,
.colour_mode = VID_NTSC,
.burst_width = 0.00000250, /* 2.5 ±0.28µs */
.burst_left = 0.00000530, /* |-->| 5.3 ±0.1µs */
.burst_level = 4.0 / 10.0, /* 4/10 of white - blanking level */
.colour_carrier = 5000000.0 * 63 / 88,
.colour_lookup_lines = 2, /* The carrier repeats after 2 lines */
.gamma = 1.2,
.rw_co = 0.299, /* R weight */
.gw_co = 0.587, /* G weight */
.bw_co = 0.114, /* B weight */
.iu_co = 0.269,
.iv_co = 0.736,
.qu_co = 0.413,
.qv_co = -0.478,
};
const vid_config_t vid_config_405_a = {
/* System A (405 line monochrome) */
.output_type = HACKTV_INT16_COMPLEX,
.modulation = VID_VSB,
.vsb_upper_bw = 750000, /* Hz */
.vsb_lower_bw = 3000000, /* Hz */
.level = 1.0, /* Overall signal level */
.video_level = 0.8, /* Power level of video */
.am_audio_level = 0.2, /* Power level of audio */
.frame_rate_num = 25,
.frame_rate_den = 1,
.lines = 405,
.active_lines = 376,
.active_width = 0.00008030, /* 80.3µs */
.active_left = 0.00001680, /* |-->| 16.8µs */
.hsync_width = 0.00000900, /* 9.00 ±1.00µs */
.vsync_long_width = 0.00004000, /* 40.0 ±2.00µs */
.white_level = 1.00,
.black_level = 0.30,
.blanking_level = 0.30,
.sync_level = 0.00,
.gamma = 1.2,
.rw_co = 0.299, /* R weight */
.gw_co = 0.587, /* G weight */
.bw_co = 0.114, /* B weight */
/* AM modulated */
.am_mono_carrier = -3500000, /* Hz */
.am_mono_bandwidth = 10000, /* Hz */
};
const vid_config_t vid_config_405 = {
/* 405 line video */
.output_type = HACKTV_INT16_REAL,
.level = 1.0, /* Overall signal level */
.video_level = 0.8, /* Power level of video */
.am_audio_level = 0.2, /* Power level of audio */
.frame_rate_num = 25,
.frame_rate_den = 1,
.lines = 405,
.active_lines = 376,
.active_width = 0.00008030, /* 80.3µs */
.active_left = 0.00001680, /* |-->| 16.8µs */
.hsync_width = 0.00000900, /* 9.00 ±1.00µs */
.vsync_long_width = 0.00004000, /* 40.0 ±2.00µs */
.white_level = 0.70,
.black_level = 0.00,
.blanking_level = 0.00,
.sync_level = -0.30,
.gamma = 1.2,
.rw_co = 0.299, /* R weight */
.gw_co = 0.587, /* G weight */
.bw_co = 0.114, /* B weight */
/* AM modulated */
.am_mono_carrier = -3500000, /* Hz */
.am_mono_bandwidth = 10000, /* Hz */
};
const vid_config_t vid_config_baird_240_am = {
/* Baird 240 line, AM modulation */
.output_type = HACKTV_INT16_COMPLEX,
.modulation = VID_AM,
.level = 1.0, /* Overall signal level */
.video_level = 1.0, /* Power level of video */
.frame_rate_num = 25,
.frame_rate_den = 1,
.lines = 240,
.active_lines = 220,
.active_width = 0.00015, /* 150µs */
.active_left = 0.000016667, /* |-->| 16.667µs */
.hsync_width = 0.000013333, /* 13.333µs */
.vsync_long_width = 0.000166667, /* 166.667µs */
.white_level = 1.00,
.black_level = 0.40,
.blanking_level = 0.40,
.sync_level = 0.00,
.gamma = 1.2,
.rw_co = 0.299, /* R weight */
.gw_co = 0.587, /* G weight */
.bw_co = 0.114, /* B weight */
};
const vid_config_t vid_config_baird_240 = {
/* Baird 240 line */
.output_type = HACKTV_INT16_REAL,
.level = 1.0, /* Overall signal level */
.video_level = 1.0, /* Power level of video */
.frame_rate_num = 25,
.frame_rate_den = 1,
.lines = 240,
.active_lines = 220,
.active_width = 0.00015, /* 150µs */
.active_left = 0.000016667, /* |-->| 16.667µs */
.hsync_width = 0.000013333, /* 13.333µs */
.vsync_long_width = 0.000166667, /* 166.667µs */
.white_level = 1.00,
.black_level = 0.40,
.blanking_level = 0.40,
.sync_level = 0.00,
.gamma = 1.2,
.rw_co = 0.299, /* R weight */
.gw_co = 0.587, /* G weight */
.bw_co = 0.114, /* B weight */
};
const vid_configs_t vid_configs[] = {
{ "i", &vid_config_pal_i },
{ "b", &vid_config_pal_bg },
{ "g", &vid_config_pal_bg },
{ "pal-fm", &vid_config_pal_fm },
{ "pal", &vid_config_pal },
{ "m", &vid_config_ntsc_m },
{ "ntsc", &vid_config_ntsc },
{ "a", &vid_config_405_a },
{ "405", &vid_config_405 },
{ "240-am", &vid_config_baird_240_am },
{ "240", &vid_config_baird_240 },
{ NULL, NULL },
};
static int16_t *_sin_int16(unsigned int length, unsigned int cycles, double level)
{
int16_t *lut;
unsigned int i;
double d;
lut = malloc(length * sizeof(int16_t));
if(!lut)
{
return(NULL);
}
d = 2.0 * M_PI / length * cycles;
for(i = 0; i < length; i++)
{
lut[i] = round(sin(d * i) * level * INT16_MAX);
}
return(lut);
}
static int16_t *_colour_subcarrier_phase(vid_t *s, int phase)
{
int frame = (s->frame - 1) & 3;
int line = s->line - 1;
int p;
/* Limit phase offset to 0 > 359 */
if((phase %= 360) < 0)
{
phase += 360;
}
/* Find the position in the table for 0 degrees at the start of this line */
p = (s->conf.lines * frame + line) * s->width;
/* And apply the offset for the required phase */
if(phase == 0)
{
p += 0;
}
else if(phase == 45)
{
p += s->colour_lookup_width * 3 / 8;
}
else if(phase == 90)
{
p += s->colour_lookup_width * 6 / 8;
}
else if(phase == 135)
{
p += s->colour_lookup_width * 1 / 8;
}
else if(phase == 180)
{
p += s->colour_lookup_width * 4 / 8;
}
else if(phase == 225)
{
p += s->colour_lookup_width * 7 / 8;
}
else if(phase == 270)
{
p += s->colour_lookup_width * 2 / 8;
}
else if(phase == 315)
{
p += s->colour_lookup_width * 5 / 8;
}
/* Keep the position within the buffer */
p %= s->colour_lookup_width;
/* Return a pointer to the line */
return(&s->colour_lookup[p]);
}
/* AV source callback handlers */
static uint32_t *_av_read_video(vid_t *s)
{
if(s->av_read_video) return(s->av_read_video(s->av_private));
return(NULL);
}
static int16_t *_av_read_audio(vid_t *s, size_t *samples)
{
if(s->av_read_audio)
{
return(s->av_read_audio(s->av_private, samples));
}
return(NULL);
}
int vid_av_close(vid_t *s)
{
int r;
r = s->av_close ? s->av_close(s->av_private) : VID_ERROR;
s->av_private = NULL;
s->av_read_video = NULL;
s->av_read_audio = NULL;
s->av_close = NULL;
return(r);
}
int vid_init(vid_t *s, unsigned int sample_rate, const vid_config_t * const conf)
{
int r;
int64_t c;
double d;
double glut[0x100];
double level;
memset(s, 0, sizeof(vid_t));
memcpy(&s->conf, conf, sizeof(vid_config_t));
/* Calculate the number of samples per line */
s->width = round((double) sample_rate / ((double) s->conf.frame_rate_num / s->conf.frame_rate_den) / s->conf.lines);
s->half_width = round((double) sample_rate / ((double) s->conf.frame_rate_num / s->conf.frame_rate_den) / s->conf.lines / 2);
/* Calculate the "actual" sample rate we use. This is calculated
* to give us an exact number of samples per line */
//s->sample_rate = s->width * s->conf.lines * s->conf.frame_rate;
// This won't work with NTSC
//if(s->sample_rate != sample_rate)
//{
// fprintf(stderr, "Sample rate error %0.2f%%\n", (double) s->sample_rate / sample_rate * 100);
//}
s->sample_rate = sample_rate;
/* Calculate the active video width and offset */
s->active_width = ceil(s->sample_rate * s->conf.active_width);
s->active_left = round(s->sample_rate * s->conf.active_left);
s->hsync_width = round(s->sample_rate * s->conf.hsync_width);
s->vsync_short_width = round(s->sample_rate * s->conf.vsync_short_width);
s->vsync_long_width = round(s->sample_rate * s->conf.vsync_long_width);
/* Calculate signal levels */
level = s->conf.video_level * s->conf.level;
/* Calculate 16-bit blank and sync levels */
s->blanking_level = round(s->conf.blanking_level * level * INT16_MAX);
s->sync_level = round(s->conf.sync_level * level * INT16_MAX);
/* Allocate memory for YUV lookup tables */
s->y_level_lookup = malloc(0x1000000 * sizeof(int16_t));
s->i_level_lookup = malloc(0x1000000 * sizeof(int16_t));
s->q_level_lookup = malloc(0x1000000 * sizeof(int16_t));
if(s->y_level_lookup == NULL ||
s->i_level_lookup == NULL ||
s->q_level_lookup == NULL)
{
vid_free(s);
return(VID_OUT_OF_MEMORY);
}
/* Generate the gamma lookup table. LUTception */
for(c = 0; c < 0x100; c++)
{
glut[c] = pow((double) c / 255, 1 / s->conf.gamma);
}
/* Generate the RGB > signal level lookup tables */
for(c = 0x000000; c <= 0xFFFFFF; c++)
{
double r, g, b;
double y, u, v;
double i, q;
/* Calculate RGB 0..1 values */
r = glut[(c & 0xFF0000) >> 16];
g = glut[(c & 0x00FF00) >> 8];
b = glut[(c & 0x0000FF) >> 0];
/* Calculate Y, Cb and Cr values */
y = r * s->conf.rw_co
+ g * s->conf.gw_co
+ b * s->conf.bw_co;
u = (b - y);
v = (r - y);
i = s->conf.iv_co * v + s->conf.iu_co * u;
q = s->conf.qv_co * v + s->conf.qu_co * u;
/* Adjust values to correct signal level */
y = s->conf.black_level + (y * (s->conf.white_level - s->conf.black_level));
i *= s->conf.white_level - s->conf.black_level;
q *= s->conf.white_level - s->conf.black_level;
/* Convert to INT16 range and store in tables */
s->y_level_lookup[c] = round(y * level * INT16_MAX);
s->i_level_lookup[c] = round(i * level * INT16_MAX);
s->q_level_lookup[c] = round(q * level * INT16_MAX);
}
if(s->conf.colour_lookup_lines > 0)
{
/* Generate the colour subcarrier lookup table */
/* This carrier is in phase with the U (B-Y) component */
s->colour_lookup_width = s->width * s->conf.colour_lookup_lines;
d = 2.0 * M_PI * s->conf.colour_carrier / s->sample_rate;
s->colour_lookup = malloc((s->colour_lookup_width + s->width) * sizeof(int16_t));
if(!s->colour_lookup)
{
vid_free(s);
return(VID_OUT_OF_MEMORY);
}
for(c = 0; c < s->colour_lookup_width; c++)
{
s->colour_lookup[c] = round(-sin(d * c) * INT16_MAX);
}
/* To make overflow easier to handle, we repeat the first line at the end */
memcpy(&s->colour_lookup[s->colour_lookup_width], s->colour_lookup, s->width * sizeof(int16_t));
}
s->burst_left = round(s->sample_rate * s->conf.burst_left);
s->burst_width = round(s->sample_rate * s->conf.burst_width);
s->burst_level = round(s->conf.burst_level * (s->conf.white_level - s->conf.blanking_level) / 2 * level * INT16_MAX);
/* Set the next line/frame counter */
/* NOTE: TV line and frame numbers start at 1 rather than 0 */
s->line = 1;
s->frame = 1;
s->framebuffer = NULL;
/* FM Audio */
if(s->conf.fm_audio_level > 0)
{
s->fm_audio_lookup_width = 32768 * (s->sample_rate / s->conf.fm_audio_deviation);
s->fm_audio_lookup = _sin_int16(s->fm_audio_lookup_width, 1, s->conf.fm_audio_level * s->conf.level);
if(!s->fm_audio_lookup)
{
vid_free(s);
return(VID_OUT_OF_MEMORY);
}
if(s->conf.fm_mono_carrier != 0)
{
s->fm_mono_delta = s->fm_audio_lookup_width * s->conf.fm_mono_carrier / s->sample_rate;
s->fm_mono_pi = s->fm_audio_lookup_width / 4;
s->fm_mono_pq = 0;
}
if(s->conf.fm_left_carrier != 0)
{
s->fm_left_delta = s->fm_audio_lookup_width * s->conf.fm_left_carrier / s->sample_rate;
s->fm_left_pi = s->fm_audio_lookup_width / 4;
s->fm_mono_pq = 0;
}
if(s->conf.fm_right_carrier != 0)
{
s->fm_right_delta = s->fm_audio_lookup_width * s->conf.fm_right_carrier / s->sample_rate;
s->fm_right_pi = s->fm_audio_lookup_width / 4;
s->fm_right_pq = 0;
}
}
/* NICAM Audio */
/*
s->nicam_lookup_width = s->fm_audio_lookup_width;
s->nicam_lookup = _sin_int16(s->nicam_lookup_width, 1, s->conf.nicam_level * s->conf.level);
if(!s->nicam_lookup)
{
vid_free(s);
return(VID_OUT_OF_MEMORY);
}
s->nicam_delta = s->nicam_lookup_width * s->conf.nicam_carrier / s->sample_rate;
for(c = 0; c < 4; c++)
{
s->nicam_q_ph[c] = s->nicam_lookup_width / 4 * c;
s->nicam_i_ph[c] = (s->nicam_q_ph[c] + (s->nicam_lookup_width / 4)) % s->nicam_lookup_width;
}
s->nicam_a = 4000 - 91;
*/
/* Output FM modulation */
if(s->conf.modulation == VID_FM)
{
s->fm_lookup_width = 32768 * (s->sample_rate / s->conf.fm_deviation);
s->fm_lookup = _sin_int16(s->fm_lookup_width, 1, s->conf.fm_level);
if(!s->fm_lookup)
{
vid_free(s);
return(VID_OUT_OF_MEMORY);
}
s->fm_delta = 0;
s->fm_pi = s->fm_lookup_width / 4;
s->fm_pq = 0;
}
/* Output line buffer */
s->output = malloc(sizeof(int16_t) * 2 * s->width);
if(!s->output)
{
vid_free(s);
return(VID_OUT_OF_MEMORY);
}
/* Initalise the teletext system */
if(s->conf.teletext && (r = tt_init(&s->tt, s, s->conf.teletext)) != VID_OK)
{
vid_free(s);
return(r);
}
/* Initialise videocrypt encoder */
if(s->conf.videocrypt && (r = vc_init(&s->vc, s)) != VID_OK)
{
vid_free(s);
return(r);
}
/* Initalise syster encoder */
if(s->conf.syster && (r = ng_init(&s->ng, s)) != VID_OK)
{
vid_free(s);
return(r);
}
return(VID_OK);
}
void vid_free(vid_t *s)
{
/* Close the AV source */
vid_av_close(s);
if(s->conf.syster)
{
ng_free(&s->ng);
}
if(s->conf.videocrypt)
{
vc_free(&s->vc);
}
if(s->conf.teletext)
{
tt_free(&s->tt);
}
if(s->video_filter_taps)
{
fir_int16_complex_free(&s->video_filter);
free(s->video_filter_taps);
}
/* Free allocated memory */
if(s->y_level_lookup != NULL) free(s->y_level_lookup);
if(s->i_level_lookup != NULL) free(s->i_level_lookup);
if(s->q_level_lookup != NULL) free(s->q_level_lookup);
if(s->colour_lookup != NULL) free(s->colour_lookup);
if(s->fm_audio_lookup != NULL) free(s->fm_audio_lookup);
//if(s->nicam_lookup != NULL) free(s->nicam_lookup);
if(s->fm_lookup != NULL) free(s->fm_lookup);
if(s->output != NULL) free(s->output);
}
void vid_info(vid_t *s)
{
printf("Video: %dx%d %.2f fps (full frame %dx%d)\n",
s->active_width, s->conf.active_lines, (double) s->conf.frame_rate_num / s->conf.frame_rate_den,
s->width, s->conf.lines
);
printf("Sample rate: %d\n", s->sample_rate);
}
int vid_init_filter(vid_t *s)
{
int taps = 51; /* Magic number :( */
if(s->conf.modulation == VID_VSB)
{
/* Prepare the video filter */
s->video_filter_taps = calloc(taps, sizeof(int16_t) * 2);
if(!s->video_filter_taps)
{
return(VID_OUT_OF_MEMORY);
}
fir_int16_complex_band_pass(s->video_filter_taps, taps, s->sample_rate, -s->conf.vsb_lower_bw, s->conf.vsb_upper_bw, 750000, 1);
fir_int16_complex_init(&s->video_filter, s->video_filter_taps, taps, 1, 1);
}
else if(s->conf.modulation == VID_FM)
{
/* Test taps for a CCIR-405 video pre-emphasis filter at 16MHz */
const int16_t fm_taps[47] = {
-1, -1, -1, -1, -2, -3, -5, -8, -13, -18, -28, -41, -62, -91, -140, -207, -322, -490, -777, -1209, -1962, -3110, -5215,
/*38620,*/ 32767, -5215, -3110, -1962, -1209, -777, -490, -322, -207, -140, -91, -62, -41, -28, -18, -13, -8, -5, -3, -2, -1, -1, -1, -1
};
s->video_filter_taps = calloc(47, sizeof(int16_t));
if(!s->video_filter_taps)
{
return(VID_OUT_OF_MEMORY);
}
memcpy(s->video_filter_taps, fm_taps, 47 * sizeof(int16_t));
fir_int16_init(&s->video_filter, s->video_filter_taps, 47, 1, 1);
}
return(VID_OK);
}
size_t vid_get_framebuffer_length(vid_t *s)
{
return(sizeof(uint32_t) * s->active_width * s->conf.active_lines);
}
int16_t *vid_next_line(vid_t *s, size_t *samples)
{
const char *seq;
int x;
int vy;
int w;
uint32_t rgb;
int pal;
int odd;
int16_t *lut_b;
int16_t *lut_i;
int16_t *lut_q;
/* Load the next frame */
if(s->line == 1)
{
s->framebuffer = _av_read_video(s);
/* No more frames from the video source? */
if(s->framebuffer == NULL)
{
return(NULL);
}
}
/* Sequence codes: abcd
*
* a: first sync
* h = horizontal sync pulse
* v = short vertical sync pulse
* V = long vertical sync pulse
*
* b: colour burst
* 0 = line always has a colour burst
* _ = line never has a colour burst
* 1 = line has a colour burst on odd frames
* 2 = line has a colour burst on even frames
*
* c: left content
* _ = blanking
* a = active video
*
* d: right content
* _ = blanking
* a = active video
* v = short vertical sync pulse
* V = long vertical sync pulse
*
**** I don't like this code, it's overly complicated for all it does.
*/
vy = -1;
if(s->conf.lines == 625)
{
switch(s->line)
{
case 1: seq = "V__V"; break;
case 2: seq = "V__V"; break;
case 3: seq = "V__v"; break;
case 4: seq = "v__v"; break;
case 5: seq = "v__v"; break;
case 6: seq = "h1__"; break;
case 7: seq = "h0__"; break;
case 8: seq = "h0__"; break;
case 9: seq = "h0__"; break;
case 10: seq = "h0__"; break;
case 11: seq = "h0__"; break;
case 12: seq = "h0__"; break;
case 13: seq = "h0__"; break;
case 14: seq = "h0__"; break;
case 15: seq = "h0__"; break;
case 16: seq = "h0__"; break;
case 17: seq = "h0__"; break;
case 18: seq = "h0__"; break;
case 19: seq = "h0__"; break;
case 20: seq = "h0__"; break;
case 21: seq = "h0__"; break;
case 22: seq = "h0__"; break;
case 23: seq = "h0_a"; break;
case 310: seq = "h1aa"; break;
case 311: seq = "v__v"; break;
case 312: seq = "v__v"; break;
case 313: seq = "v__V"; break;