From 8992cb1d0d07edc33d274f6d7924ecdf6f83d994 Mon Sep 17 00:00:00 2001 From: Tim Redfern Date: Thu, 5 Sep 2013 17:57:22 +0100 Subject: making act segmenter --- ffmpeg/libavcodec/dirac.c | 334 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 334 insertions(+) create mode 100644 ffmpeg/libavcodec/dirac.c (limited to 'ffmpeg/libavcodec/dirac.c') diff --git a/ffmpeg/libavcodec/dirac.c b/ffmpeg/libavcodec/dirac.c new file mode 100644 index 0000000..e132acc --- /dev/null +++ b/ffmpeg/libavcodec/dirac.c @@ -0,0 +1,334 @@ +/* + * Copyright (C) 2007 Marco Gerards + * Copyright (C) 2009 David Conrad + * Copyright (C) 2011 Jordi Ortiz + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** + * @file + * Dirac Decoder + * @author Marco Gerards , David Conrad, Jordi Ortiz + */ + +#include "libavutil/imgutils.h" +#include "dirac.h" +#include "avcodec.h" +#include "golomb.h" +#include "mpeg12data.h" + +/* defaults for source parameters */ +static const dirac_source_params dirac_source_parameters_defaults[] = { + { 640, 480, 2, 0, 0, 1, 1, 640, 480, 0, 0, 1, 0 }, + { 176, 120, 2, 0, 0, 9, 2, 176, 120, 0, 0, 1, 1 }, + { 176, 144, 2, 0, 1, 10, 3, 176, 144, 0, 0, 1, 2 }, + { 352, 240, 2, 0, 0, 9, 2, 352, 240, 0, 0, 1, 1 }, + { 352, 288, 2, 0, 1, 10, 3, 352, 288, 0, 0, 1, 2 }, + { 704, 480, 2, 0, 0, 9, 2, 704, 480, 0, 0, 1, 1 }, + { 704, 576, 2, 0, 1, 10, 3, 704, 576, 0, 0, 1, 2 }, + { 720, 480, 1, 1, 0, 4, 2, 704, 480, 8, 0, 3, 1 }, + { 720, 576, 1, 1, 1, 3, 3, 704, 576, 8, 0, 3, 2 }, + { 1280, 720, 1, 0, 1, 7, 1, 1280, 720, 0, 0, 3, 3 }, + { 1280, 720, 1, 0, 1, 6, 1, 1280, 720, 0, 0, 3, 3 }, + { 1920, 1080, 1, 1, 1, 4, 1, 1920, 1080, 0, 0, 3, 3 }, + { 1920, 1080, 1, 1, 1, 3, 1, 1920, 1080, 0, 0, 3, 3 }, + { 1920, 1080, 1, 0, 1, 7, 1, 1920, 1080, 0, 0, 3, 3 }, + { 1920, 1080, 1, 0, 1, 6, 1, 1920, 1080, 0, 0, 3, 3 }, + { 2048, 1080, 0, 0, 1, 2, 1, 2048, 1080, 0, 0, 4, 4 }, + { 4096, 2160, 0, 0, 1, 2, 1, 4096, 2160, 0, 0, 4, 4 }, + { 3840, 2160, 1, 0, 1, 7, 1, 3840, 2160, 0, 0, 3, 3 }, + { 3840, 2160, 1, 0, 1, 6, 1, 3840, 2160, 0, 0, 3, 3 }, + { 7680, 4320, 1, 0, 1, 7, 1, 3840, 2160, 0, 0, 3, 3 }, + { 7680, 4320, 1, 0, 1, 6, 1, 3840, 2160, 0, 0, 3, 3 }, +}; + +/* [DIRAC_STD] Table 10.4 - Available preset pixel aspect ratio values */ +static const AVRational dirac_preset_aspect_ratios[] = { + {1, 1}, + {10, 11}, + {12, 11}, + {40, 33}, + {16, 11}, + {4, 3}, +}; + +/* [DIRAC_STD] Values 9,10 of 10.3.5 Frame Rate. + * Table 10.3 Available preset frame rate values + */ +static const AVRational dirac_frame_rate[] = { + {15000, 1001}, + {25, 2}, +}; + +/* [DIRAC_STD] This should be equivalent to Table 10.5 Available signal + * range presets */ +static const struct { + uint8_t bitdepth; + enum AVColorRange color_range; +} pixel_range_presets[] = { + {8, AVCOL_RANGE_JPEG}, + {8, AVCOL_RANGE_MPEG}, + {10, AVCOL_RANGE_MPEG}, + {12, AVCOL_RANGE_MPEG}, +}; + +static const enum AVColorPrimaries dirac_primaries[] = { + AVCOL_PRI_BT709, + AVCOL_PRI_SMPTE170M, + AVCOL_PRI_BT470BG, +}; + +static const struct { + enum AVColorPrimaries color_primaries; + enum AVColorSpace colorspace; + enum AVColorTransferCharacteristic color_trc; +} dirac_color_presets[] = { + { AVCOL_PRI_BT709, AVCOL_SPC_BT709, AVCOL_TRC_BT709 }, + { AVCOL_PRI_SMPTE170M, AVCOL_SPC_BT470BG, AVCOL_TRC_BT709 }, + { AVCOL_PRI_BT470BG, AVCOL_SPC_BT470BG, AVCOL_TRC_BT709 }, + { AVCOL_PRI_BT709, AVCOL_SPC_BT709, AVCOL_TRC_BT709 }, + { AVCOL_PRI_BT709, AVCOL_SPC_BT709, AVCOL_TRC_UNSPECIFIED /* DCinema */ }, +}; + +/* [DIRAC_STD] Table 10.2 Supported chroma sampling formats + luma Offset */ +static const enum AVPixelFormat dirac_pix_fmt[2][3] = { + { AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P }, + { AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P }, +}; + +/* [DIRAC_STD] 10.3 Parse Source Parameters. + * source_parameters(base_video_format) */ +static int parse_source_parameters(AVCodecContext *avctx, GetBitContext *gb, + dirac_source_params *source) +{ + AVRational frame_rate = {0,0}; + unsigned luma_depth = 8, luma_offset = 16; + int idx; + int chroma_x_shift, chroma_y_shift; + + /* [DIRAC_STD] 10.3.2 Frame size. frame_size(video_params) */ + /* [DIRAC_STD] custom_dimensions_flag */ + if (get_bits1(gb)) { + source->width = svq3_get_ue_golomb(gb); /* [DIRAC_STD] FRAME_WIDTH */ + source->height = svq3_get_ue_golomb(gb); /* [DIRAC_STD] FRAME_HEIGHT */ + } + + /* [DIRAC_STD] 10.3.3 Chroma Sampling Format. + * chroma_sampling_format(video_params) */ + /* [DIRAC_STD] custom_chroma_format_flag */ + if (get_bits1(gb)) + /* [DIRAC_STD] CHROMA_FORMAT_INDEX */ + source->chroma_format = svq3_get_ue_golomb(gb); + if (source->chroma_format > 2U) { + av_log(avctx, AV_LOG_ERROR, "Unknown chroma format %d\n", + source->chroma_format); + return AVERROR_INVALIDDATA; + } + + /* [DIRAC_STD] 10.3.4 Scan Format. scan_format(video_params) */ + /* [DIRAC_STD] custom_scan_format_flag */ + if (get_bits1(gb)) + /* [DIRAC_STD] SOURCE_SAMPLING */ + source->interlaced = svq3_get_ue_golomb(gb); + if (source->interlaced > 1U) + return AVERROR_INVALIDDATA; + + /* [DIRAC_STD] 10.3.5 Frame Rate. frame_rate(video_params) */ + if (get_bits1(gb)) { /* [DIRAC_STD] custom_frame_rate_flag */ + source->frame_rate_index = svq3_get_ue_golomb(gb); + + if (source->frame_rate_index > 10U) + return AVERROR_INVALIDDATA; + + if (!source->frame_rate_index) { + /* [DIRAC_STD] FRAME_RATE_NUMER */ + frame_rate.num = svq3_get_ue_golomb(gb); + /* [DIRAC_STD] FRAME_RATE_DENOM */ + frame_rate.den = svq3_get_ue_golomb(gb); + } + } + /* [DIRAC_STD] preset_frame_rate(video_params, index) */ + if (source->frame_rate_index > 0) { + if (source->frame_rate_index <= 8) + frame_rate = ff_mpeg12_frame_rate_tab[source->frame_rate_index]; + else + /* [DIRAC_STD] Table 10.3 values 9-10 */ + frame_rate = dirac_frame_rate[source->frame_rate_index-9]; + } + av_reduce(&avctx->time_base.num, &avctx->time_base.den, + frame_rate.den, frame_rate.num, 1<<30); + + /* [DIRAC_STD] 10.3.6 Pixel Aspect Ratio. + * pixel_aspect_ratio(video_params) */ + if (get_bits1(gb)) { /* [DIRAC_STD] custom_pixel_aspect_ratio_flag */ + /* [DIRAC_STD] index */ + source->aspect_ratio_index = svq3_get_ue_golomb(gb); + + if (source->aspect_ratio_index > 6U) + return AVERROR_INVALIDDATA; + + if (!source->aspect_ratio_index) { + avctx->sample_aspect_ratio.num = svq3_get_ue_golomb(gb); + avctx->sample_aspect_ratio.den = svq3_get_ue_golomb(gb); + } + } + /* [DIRAC_STD] Take value from Table 10.4 Available preset pixel + * aspect ratio values */ + if (source->aspect_ratio_index > 0) + avctx->sample_aspect_ratio = + dirac_preset_aspect_ratios[source->aspect_ratio_index-1]; + + /* [DIRAC_STD] 10.3.7 Clean area. clean_area(video_params) */ + if (get_bits1(gb)) { /* [DIRAC_STD] custom_clean_area_flag */ + /* [DIRAC_STD] CLEAN_WIDTH */ + source->clean_width = svq3_get_ue_golomb(gb); + /* [DIRAC_STD] CLEAN_HEIGHT */ + source->clean_height = svq3_get_ue_golomb(gb); + /* [DIRAC_STD] CLEAN_LEFT_OFFSET */ + source->clean_left_offset = svq3_get_ue_golomb(gb); + /* [DIRAC_STD] CLEAN_RIGHT_OFFSET */ + source->clean_right_offset = svq3_get_ue_golomb(gb); + } + + /* [DIRAC_STD] 10.3.8 Signal range. signal_range(video_params) + * WARNING: Some adaptation seems to be done using the + * AVCOL_RANGE_MPEG/JPEG values */ + if (get_bits1(gb)) { /* [DIRAC_STD] custom_signal_range_flag */ + /* [DIRAC_STD] index */ + source->pixel_range_index = svq3_get_ue_golomb(gb); + + if (source->pixel_range_index > 4U) + return AVERROR_INVALIDDATA; + + /* This assumes either fullrange or MPEG levels only */ + if (!source->pixel_range_index) { + luma_offset = svq3_get_ue_golomb(gb); + luma_depth = av_log2(svq3_get_ue_golomb(gb))+1; + svq3_get_ue_golomb(gb); /* chroma offset */ + svq3_get_ue_golomb(gb); /* chroma excursion */ + avctx->color_range = luma_offset ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG; + } + } + /* [DIRAC_STD] Table 10.5 + * Available signal range presets <--> pixel_range_presets */ + if (source->pixel_range_index > 0) { + idx = source->pixel_range_index-1; + luma_depth = pixel_range_presets[idx].bitdepth; + avctx->color_range = pixel_range_presets[idx].color_range; + } + + if (luma_depth > 8) + av_log(avctx, AV_LOG_WARNING, "Bitdepth greater than 8\n"); + + avctx->pix_fmt = dirac_pix_fmt[!luma_offset][source->chroma_format]; + avcodec_get_chroma_sub_sample(avctx->pix_fmt, &chroma_x_shift, &chroma_y_shift); + if ((source->width % (1<height % (1<color_spec_index = svq3_get_ue_golomb(gb); + + if (source->color_spec_index > 4U) + return AVERROR_INVALIDDATA; + + avctx->color_primaries = dirac_color_presets[idx].color_primaries; + avctx->colorspace = dirac_color_presets[idx].colorspace; + avctx->color_trc = dirac_color_presets[idx].color_trc; + + if (!source->color_spec_index) { + /* [DIRAC_STD] 10.3.9.1 Colour primaries */ + if (get_bits1(gb)) { + idx = svq3_get_ue_golomb(gb); + if (idx < 3U) + avctx->color_primaries = dirac_primaries[idx]; + } + /* [DIRAC_STD] 10.3.9.2 Colour matrix */ + if (get_bits1(gb)) { + idx = svq3_get_ue_golomb(gb); + if (!idx) + avctx->colorspace = AVCOL_SPC_BT709; + else if (idx == 1) + avctx->colorspace = AVCOL_SPC_BT470BG; + } + /* [DIRAC_STD] 10.3.9.3 Transfer function */ + if (get_bits1(gb) && !svq3_get_ue_golomb(gb)) + avctx->color_trc = AVCOL_TRC_BT709; + } + } else { + idx = source->color_spec_index; + avctx->color_primaries = dirac_color_presets[idx].color_primaries; + avctx->colorspace = dirac_color_presets[idx].colorspace; + avctx->color_trc = dirac_color_presets[idx].color_trc; + } + + return 0; +} + +/* [DIRAC_STD] 10. Sequence Header. sequence_header() */ +int avpriv_dirac_parse_sequence_header(AVCodecContext *avctx, GetBitContext *gb, + dirac_source_params *source) +{ + unsigned version_major; + unsigned video_format, picture_coding_mode; + int ret; + + /* [DIRAC_SPEC] 10.1 Parse Parameters. parse_parameters() */ + version_major = svq3_get_ue_golomb(gb); + svq3_get_ue_golomb(gb); /* version_minor */ + avctx->profile = svq3_get_ue_golomb(gb); + avctx->level = svq3_get_ue_golomb(gb); + /* [DIRAC_SPEC] sequence_header() -> base_video_format as defined in + * 10.2 Base Video Format, table 10.1 Dirac predefined video formats */ + video_format = svq3_get_ue_golomb(gb); + + if (version_major < 2) + av_log(avctx, AV_LOG_WARNING, "Stream is old and may not work\n"); + else if (version_major > 2) + av_log(avctx, AV_LOG_WARNING, "Stream may have unhandled features\n"); + + if (video_format > 20U) + return AVERROR_INVALIDDATA; + + /* Fill in defaults for the source parameters. */ + *source = dirac_source_parameters_defaults[video_format]; + + /* [DIRAC_STD] 10.3 Source Parameters + * Override the defaults. */ + if (ret = parse_source_parameters(avctx, gb, source)) + return ret; + + if (ret = av_image_check_size(source->width, source->height, 0, avctx)) + return ret; + + avcodec_set_dimensions(avctx, source->width, source->height); + + /* [DIRAC_STD] picture_coding_mode shall be 0 for fields and 1 for frames + * currently only used to signal field coding */ + picture_coding_mode = svq3_get_ue_golomb(gb); + if (picture_coding_mode != 0) { + av_log(avctx, AV_LOG_ERROR, "Unsupported picture coding mode %d\n", + picture_coding_mode); + return AVERROR_INVALIDDATA; + } + return 0; +} -- cgit v1.2.3