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-rw-r--r--ext/mplex/mpegconsts.cc427
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diff --git a/ext/mplex/mpegconsts.cc b/ext/mplex/mpegconsts.cc
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-
-/*
- * mpegconsts.c: Video format constants for MPEG and utilities for display
- * and conversion to format used for yuv4mpeg
- *
- * Copyright (C) 2001 Andrew Stevens <andrew.stevens@philips.com>
- * Copyright (C) 2001 Matthew Marjanovic <maddog@mir.com>
- *
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of version 2 of the GNU General Public License
- * as published by the Free Software Foundation.
- *
- * 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, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- */
-
-#include <config.h>
-#include "mpegconsts.h"
-#include "yuv4mpeg.h"
-#include "yuv4mpeg_intern.h"
-
-static y4m_ratio_t mpeg_framerates[] = {
- Y4M_FPS_UNKNOWN,
- Y4M_FPS_NTSC_FILM,
- Y4M_FPS_FILM,
- Y4M_FPS_PAL,
- Y4M_FPS_NTSC,
- Y4M_FPS_30,
- Y4M_FPS_PAL_FIELD,
- Y4M_FPS_NTSC_FIELD,
- Y4M_FPS_60
-};
-
-
-#define MPEG_NUM_RATES (sizeof(mpeg_framerates)/sizeof(mpeg_framerates[0]))
-const mpeg_framerate_code_t mpeg_num_framerates = MPEG_NUM_RATES;
-
-static const char *framerate_definitions[MPEG_NUM_RATES] = {
- "illegal",
- "24000.0/1001.0 (NTSC 3:2 pulldown converted FILM)",
- "24.0 (NATIVE FILM)",
- "25.0 (PAL/SECAM VIDEO / converted FILM)",
- "30000.0/1001.0 (NTSC VIDEO)",
- "30.0",
- "50.0 (PAL FIELD RATE)",
- "60000.0/1001.0 (NTSC FIELD RATE)",
- "60.0"
-};
-
-
-static const char *mpeg1_aspect_ratio_definitions[] = {
- "1:1 (square pixels)",
- "1:0.6735",
- "1:0.7031 (16:9 Anamorphic PAL/SECAM for 720x578/352x288 images)",
- "1:0.7615",
- "1:0.8055",
- "1:0.8437 (16:9 Anamorphic NTSC for 720x480/352x240 images)",
- "1:0.8935",
- "1:0.9375 (4:3 PAL/SECAM for 720x578/352x288 images)",
- "1:0.9815",
- "1:1.0255",
- "1:1:0695",
- "1:1.1250 (4:3 NTSC for 720x480/352x240 images)",
- "1:1.1575",
- "1:1.2015"
-};
-
-static const y4m_ratio_t mpeg1_aspect_ratios[] = {
- Y4M_SAR_MPEG1_1,
- Y4M_SAR_MPEG1_2,
- Y4M_SAR_MPEG1_3, /* Anamorphic 16:9 PAL */
- Y4M_SAR_MPEG1_4,
- Y4M_SAR_MPEG1_5,
- Y4M_SAR_MPEG1_6, /* Anamorphic 16:9 NTSC */
- Y4M_SAR_MPEG1_7,
- Y4M_SAR_MPEG1_8, /* PAL/SECAM 4:3 */
- Y4M_SAR_MPEG1_9,
- Y4M_SAR_MPEG1_10,
- Y4M_SAR_MPEG1_11,
- Y4M_SAR_MPEG1_12, /* NTSC 4:3 */
- Y4M_SAR_MPEG1_13,
- Y4M_SAR_MPEG1_14,
-};
-
-static const char *mpeg2_aspect_ratio_definitions[] = {
- "1:1 pixels",
- "4:3 display",
- "16:9 display",
- "2.21:1 display"
-};
-
-
-static const y4m_ratio_t mpeg2_aspect_ratios[] = {
- Y4M_DAR_MPEG2_1,
- Y4M_DAR_MPEG2_2,
- Y4M_DAR_MPEG2_3,
- Y4M_DAR_MPEG2_4
-};
-
-static const char **aspect_ratio_definitions[2] = {
- mpeg1_aspect_ratio_definitions,
- mpeg2_aspect_ratio_definitions
-};
-
-static const y4m_ratio_t *mpeg_aspect_ratios[2] = {
- mpeg1_aspect_ratios,
- mpeg2_aspect_ratios
-};
-
-const mpeg_aspect_code_t mpeg_num_aspect_ratios[2] = {
- sizeof (mpeg1_aspect_ratios) / sizeof (mpeg1_aspect_ratios[0]),
- sizeof (mpeg2_aspect_ratios) / sizeof (mpeg2_aspect_ratios[0])
-};
-
-/*
- * Convert MPEG frame-rate code to corresponding frame-rate
- */
-
-y4m_ratio_t
-mpeg_framerate (mpeg_framerate_code_t code)
-{
- if (code == 0 || code > mpeg_num_framerates)
- return y4m_fps_UNKNOWN;
- else
- return mpeg_framerates[code];
-}
-
-/*
- * Look-up MPEG frame rate code for a (exact) frame rate.
- */
-
-
-mpeg_framerate_code_t
-mpeg_framerate_code (y4m_ratio_t framerate)
-{
- mpeg_framerate_code_t i;
-
- y4m_ratio_reduce (&framerate);
- for (i = 1; i < mpeg_num_framerates; ++i) {
- if (Y4M_RATIO_EQL (framerate, mpeg_framerates[i]))
- return i;
- }
- return 0;
-}
-
-
-/* small enough to distinguish 1/1000 from 1/1001 */
-#define MPEG_FPS_TOLERANCE 0.0001
-
-
-y4m_ratio_t
-mpeg_conform_framerate (double fps)
-{
- mpeg_framerate_code_t i;
- y4m_ratio_t result;
-
- /* try to match it to a standard frame rate */
- for (i = 1; i < mpeg_num_framerates; i++) {
- double deviation = 1.0 - (Y4M_RATIO_DBL (mpeg_framerates[i]) / fps);
-
- if ((deviation > -MPEG_FPS_TOLERANCE) && (deviation < +MPEG_FPS_TOLERANCE))
- return mpeg_framerates[i];
- }
- /* no luck? just turn it into a ratio (6 decimal place accuracy) */
- result.n = (int) ((fps * 1000000.0) + 0.5);
- result.d = 1000000;
- y4m_ratio_reduce (&result);
- return result;
-}
-
-
-
-/*
- * Convert MPEG aspect-ratio code to corresponding aspect-ratio
- */
-
-y4m_ratio_t
-mpeg_aspect_ratio (int mpeg_version, mpeg_aspect_code_t code)
-{
- y4m_ratio_t ratio;
-
- if (mpeg_version < 1 || mpeg_version > 2)
- return y4m_sar_UNKNOWN;
- if (code == 0 || code > mpeg_num_aspect_ratios[mpeg_version - 1])
- return y4m_sar_UNKNOWN;
- else {
- ratio = mpeg_aspect_ratios[mpeg_version - 1][code - 1];
- y4m_ratio_reduce (&ratio);
- return ratio;
- }
-}
-
-/*
- * Look-up corresponding MPEG aspect ratio code given an exact aspect ratio.
- *
- * WARNING: The semantics of aspect ratio coding *changed* between
- * MPEG1 and MPEG2. In MPEG1 it is the *pixel* aspect ratio. In
- * MPEG2 it is the (far more sensible) aspect ratio of the eventual
- * display.
- *
- */
-
-mpeg_aspect_code_t
-mpeg_frame_aspect_code (int mpeg_version, y4m_ratio_t aspect_ratio)
-{
- mpeg_aspect_code_t i;
- y4m_ratio_t red_ratio = aspect_ratio;
-
- y4m_ratio_reduce (&red_ratio);
- if (mpeg_version < 1 || mpeg_version > 2)
- return 0;
- for (i = 1; i < mpeg_num_aspect_ratios[mpeg_version - 1]; ++i) {
- y4m_ratio_t red_entry = mpeg_aspect_ratios[mpeg_version - 1][i - 1];
-
- y4m_ratio_reduce (&red_entry);
- if (Y4M_RATIO_EQL (red_entry, red_ratio))
- return i;
- }
-
- return 0;
-
-}
-
-
-
-/*
- * Guess the correct MPEG aspect ratio code,
- * given the true sample aspect ratio and frame size of a video stream
- * (and the MPEG version, 1 or 2).
- *
- * Returns 0 if it has no good guess.
- *
- */
-
-
-/* this is big enough to accommodate the difference between 720 and 704 */
-#define GUESS_ASPECT_TOLERANCE 0.03
-
-mpeg_aspect_code_t
-mpeg_guess_mpeg_aspect_code (int mpeg_version, y4m_ratio_t sampleaspect,
- int frame_width, int frame_height)
-{
- if (Y4M_RATIO_EQL (sampleaspect, y4m_sar_UNKNOWN)) {
- return 0;
- }
- switch (mpeg_version) {
- case 1:
- if (Y4M_RATIO_EQL (sampleaspect, y4m_sar_SQUARE)) {
- return 1;
- } else if (Y4M_RATIO_EQL (sampleaspect, y4m_sar_NTSC_CCIR601)) {
- return 12;
- } else if (Y4M_RATIO_EQL (sampleaspect, y4m_sar_NTSC_16_9)) {
- return 6;
- } else if (Y4M_RATIO_EQL (sampleaspect, y4m_sar_PAL_CCIR601)) {
- return 8;
- } else if (Y4M_RATIO_EQL (sampleaspect, y4m_sar_PAL_16_9)) {
- return 3;
- }
- return 0;
- break;
- case 2:
- if (Y4M_RATIO_EQL (sampleaspect, y4m_sar_SQUARE)) {
- return 1; /* '1' means square *pixels* in MPEG-2; go figure. */
- } else {
- unsigned int i;
- double true_far; /* true frame aspect ratio */
-
- true_far =
- (double) (sampleaspect.n * frame_width) / (double) (sampleaspect.d * frame_height);
- /* start at '2'... */
- for (i = 2; i < mpeg_num_aspect_ratios[mpeg_version - 1]; i++) {
- double ratio = true_far / Y4M_RATIO_DBL (mpeg_aspect_ratios[mpeg_version - 1][i - 1]);
-
- if ((ratio > (1.0 - GUESS_ASPECT_TOLERANCE)) && (ratio < (1.0 + GUESS_ASPECT_TOLERANCE)))
- return i;
- }
- return 0;
- }
- break;
- default:
- return 0;
- break;
- }
-}
-
-
-
-
-/*
- * Guess the true sample aspect ratio of a video stream,
- * given the MPEG aspect ratio code and the actual frame size
- * (and the MPEG version, 1 or 2).
- *
- * Returns y4m_sar_UNKNOWN if it has no good guess.
- *
- */
-y4m_ratio_t
-mpeg_guess_sample_aspect_ratio (int mpeg_version,
- mpeg_aspect_code_t code, int frame_width, int frame_height)
-{
- switch (mpeg_version) {
- case 1:
- /* MPEG-1 codes turn into SAR's, just not quite the right ones.
- For the common/known values, we provide the ratio used in practice,
- otherwise say we don't know. */
- switch (code) {
- case 1:
- return y4m_sar_SQUARE;
- break;
- case 3:
- return y4m_sar_PAL_16_9;
- break;
- case 6:
- return y4m_sar_NTSC_16_9;
- break;
- case 8:
- return y4m_sar_PAL_CCIR601;
- break;
- case 12:
- return y4m_sar_NTSC_CCIR601;
- break;
- default:
- return y4m_sar_UNKNOWN;
- break;
- }
- break;
- case 2:
- /* MPEG-2 codes turn into Frame Aspect Ratios, though not exactly the
- FAR's used in practice. For common/standard frame sizes, we provide
- the original SAR; otherwise, we say we don't know. */
- if (code == 1) {
- return y4m_sar_SQUARE; /* '1' means square *pixels* in MPEG-2 */
- } else if ((code >= 2) && (code <= 4)) {
- return y4m_guess_sar (frame_width, frame_height, mpeg2_aspect_ratios[code - 1]);
- } else {
- return y4m_sar_UNKNOWN;
- }
- break;
- default:
- return y4m_sar_UNKNOWN;
- break;
- }
-}
-
-
-
-
-
-/*
- * Look-up MPEG explanatory definition string for frame rate code
- *
- */
-
-
-const char *
-mpeg_framerate_code_definition (mpeg_framerate_code_t code)
-{
- if (code == 0 || code >= mpeg_num_framerates)
- return "UNDEFINED: illegal/reserved frame-rate ratio code";
-
- return framerate_definitions[code];
-}
-
-/*
- * Look-up MPEG explanatory definition string aspect ratio code for an
- * aspect ratio code
- *
- */
-
-const char *
-mpeg_aspect_code_definition (int mpeg_version, mpeg_aspect_code_t code)
-{
- if (mpeg_version < 1 || mpeg_version > 2)
- return "UNDEFINED: illegal MPEG version";
-
- if (code < 1 || code > mpeg_num_aspect_ratios[mpeg_version - 1])
- return "UNDEFINED: illegal aspect ratio code";
-
- return aspect_ratio_definitions[mpeg_version - 1][code - 1];
-}
-
-
-/*
- * Look-up explanatory definition of interlace field order code
- *
- */
-
-const char *
-mpeg_interlace_code_definition (int yuv4m_interlace_code)
-{
- const char *def;
-
- switch (yuv4m_interlace_code) {
- case Y4M_UNKNOWN:
- def = "unknown";
- break;
- case Y4M_ILACE_NONE:
- def = "none/progressive";
- break;
- case Y4M_ILACE_TOP_FIRST:
- def = "top-field-first";
- break;
- case Y4M_ILACE_BOTTOM_FIRST:
- def = "bottom-field-first";
- break;
- default:
- def = "UNDEFINED: illegal video interlacing type-code!";
- break;
- }
- return def;
-}
-
-
-/*
- * Local variables:
- * c-file-style: "stroustrup"
- * tab-width: 4
- * indent-tabs-mode: nil
- * End:
- */
generated by cgit v1.2.1 (git 2.18.0) at 2024-07-04 23:59:58 +0000