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679 lines
18 KiB
679 lines
18 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (C) 2019 Pengutronix, Michael Tretter <[email protected]> |
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* |
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* Convert NAL units between raw byte sequence payloads (RBSP) and C structs |
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* |
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* The conversion is defined in "ITU-T Rec. H.264 (04/2017) Advanced video |
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* coding for generic audiovisual services". Decoder drivers may use the |
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* parser to parse RBSP from encoded streams and configure the hardware, if |
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* the hardware is not able to parse RBSP itself. Encoder drivers may use the |
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* generator to generate the RBSP for SPS/PPS nal units and add them to the |
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* encoded stream if the hardware does not generate the units. |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/types.h> |
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#include <linux/string.h> |
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#include <linux/v4l2-controls.h> |
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#include <linux/device.h> |
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#include <linux/export.h> |
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#include <linux/log2.h> |
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#include "nal-h264.h" |
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#include "nal-rbsp.h" |
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|
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/* |
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* See Rec. ITU-T H.264 (04/2017) Table 7-1 - NAL unit type codes, syntax |
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* element categories, and NAL unit type classes |
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*/ |
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enum nal_unit_type { |
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SEQUENCE_PARAMETER_SET = 7, |
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PICTURE_PARAMETER_SET = 8, |
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FILLER_DATA = 12, |
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}; |
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/** |
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* nal_h264_profile_from_v4l2() - Get profile_idc for v4l2 h264 profile |
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* @profile: the profile as &enum v4l2_mpeg_video_h264_profile |
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* |
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* Convert the &enum v4l2_mpeg_video_h264_profile to profile_idc as specified |
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* in Rec. ITU-T H.264 (04/2017) A.2. |
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* |
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* Return: the profile_idc for the passed level |
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*/ |
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int nal_h264_profile_from_v4l2(enum v4l2_mpeg_video_h264_profile profile) |
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{ |
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switch (profile) { |
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case V4L2_MPEG_VIDEO_H264_PROFILE_BASELINE: |
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return 66; |
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case V4L2_MPEG_VIDEO_H264_PROFILE_MAIN: |
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return 77; |
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case V4L2_MPEG_VIDEO_H264_PROFILE_EXTENDED: |
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return 88; |
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case V4L2_MPEG_VIDEO_H264_PROFILE_HIGH: |
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return 100; |
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default: |
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return -EINVAL; |
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} |
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} |
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/** |
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* nal_h264_level_from_v4l2() - Get level_idc for v4l2 h264 level |
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* @level: the level as &enum v4l2_mpeg_video_h264_level |
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* |
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* Convert the &enum v4l2_mpeg_video_h264_level to level_idc as specified in |
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* Rec. ITU-T H.264 (04/2017) A.3.2. |
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* |
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* Return: the level_idc for the passed level |
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*/ |
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int nal_h264_level_from_v4l2(enum v4l2_mpeg_video_h264_level level) |
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{ |
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switch (level) { |
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case V4L2_MPEG_VIDEO_H264_LEVEL_1_0: |
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return 10; |
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case V4L2_MPEG_VIDEO_H264_LEVEL_1B: |
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return 9; |
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case V4L2_MPEG_VIDEO_H264_LEVEL_1_1: |
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return 11; |
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case V4L2_MPEG_VIDEO_H264_LEVEL_1_2: |
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return 12; |
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case V4L2_MPEG_VIDEO_H264_LEVEL_1_3: |
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return 13; |
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case V4L2_MPEG_VIDEO_H264_LEVEL_2_0: |
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return 20; |
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case V4L2_MPEG_VIDEO_H264_LEVEL_2_1: |
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return 21; |
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case V4L2_MPEG_VIDEO_H264_LEVEL_2_2: |
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return 22; |
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case V4L2_MPEG_VIDEO_H264_LEVEL_3_0: |
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return 30; |
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case V4L2_MPEG_VIDEO_H264_LEVEL_3_1: |
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return 31; |
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case V4L2_MPEG_VIDEO_H264_LEVEL_3_2: |
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return 32; |
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case V4L2_MPEG_VIDEO_H264_LEVEL_4_0: |
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return 40; |
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case V4L2_MPEG_VIDEO_H264_LEVEL_4_1: |
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return 41; |
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case V4L2_MPEG_VIDEO_H264_LEVEL_4_2: |
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return 42; |
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case V4L2_MPEG_VIDEO_H264_LEVEL_5_0: |
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return 50; |
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case V4L2_MPEG_VIDEO_H264_LEVEL_5_1: |
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return 51; |
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default: |
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return -EINVAL; |
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} |
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} |
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static void nal_h264_write_start_code_prefix(struct rbsp *rbsp) |
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{ |
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u8 *p = rbsp->data + DIV_ROUND_UP(rbsp->pos, 8); |
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int i = 4; |
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if (DIV_ROUND_UP(rbsp->pos, 8) + i > rbsp->size) { |
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rbsp->error = -EINVAL; |
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return; |
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} |
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p[0] = 0x00; |
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p[1] = 0x00; |
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p[2] = 0x00; |
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p[3] = 0x01; |
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rbsp->pos += i * 8; |
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} |
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static void nal_h264_read_start_code_prefix(struct rbsp *rbsp) |
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{ |
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u8 *p = rbsp->data + DIV_ROUND_UP(rbsp->pos, 8); |
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int i = 4; |
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if (DIV_ROUND_UP(rbsp->pos, 8) + i > rbsp->size) { |
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rbsp->error = -EINVAL; |
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return; |
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} |
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if (p[0] != 0x00 || p[1] != 0x00 || p[2] != 0x00 || p[3] != 0x01) { |
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rbsp->error = -EINVAL; |
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return; |
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} |
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rbsp->pos += i * 8; |
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} |
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static void nal_h264_write_filler_data(struct rbsp *rbsp) |
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{ |
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u8 *p = rbsp->data + DIV_ROUND_UP(rbsp->pos, 8); |
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int i; |
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/* Keep 1 byte extra for terminating the NAL unit */ |
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i = rbsp->size - DIV_ROUND_UP(rbsp->pos, 8) - 1; |
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memset(p, 0xff, i); |
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rbsp->pos += i * 8; |
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} |
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static void nal_h264_read_filler_data(struct rbsp *rbsp) |
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{ |
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u8 *p = rbsp->data + DIV_ROUND_UP(rbsp->pos, 8); |
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while (*p == 0xff) { |
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if (DIV_ROUND_UP(rbsp->pos, 8) > rbsp->size) { |
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rbsp->error = -EINVAL; |
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return; |
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} |
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p++; |
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rbsp->pos += 8; |
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} |
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} |
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static void nal_h264_rbsp_hrd_parameters(struct rbsp *rbsp, |
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struct nal_h264_hrd_parameters *hrd) |
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{ |
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unsigned int i; |
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if (!hrd) { |
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rbsp->error = -EINVAL; |
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return; |
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} |
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rbsp_uev(rbsp, &hrd->cpb_cnt_minus1); |
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rbsp_bits(rbsp, 4, &hrd->bit_rate_scale); |
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rbsp_bits(rbsp, 4, &hrd->cpb_size_scale); |
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for (i = 0; i <= hrd->cpb_cnt_minus1; i++) { |
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rbsp_uev(rbsp, &hrd->bit_rate_value_minus1[i]); |
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rbsp_uev(rbsp, &hrd->cpb_size_value_minus1[i]); |
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rbsp_bit(rbsp, &hrd->cbr_flag[i]); |
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} |
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rbsp_bits(rbsp, 5, &hrd->initial_cpb_removal_delay_length_minus1); |
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rbsp_bits(rbsp, 5, &hrd->cpb_removal_delay_length_minus1); |
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rbsp_bits(rbsp, 5, &hrd->dpb_output_delay_length_minus1); |
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rbsp_bits(rbsp, 5, &hrd->time_offset_length); |
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} |
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static void nal_h264_rbsp_vui_parameters(struct rbsp *rbsp, |
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struct nal_h264_vui_parameters *vui) |
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{ |
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if (!vui) { |
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rbsp->error = -EINVAL; |
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return; |
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} |
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rbsp_bit(rbsp, &vui->aspect_ratio_info_present_flag); |
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if (vui->aspect_ratio_info_present_flag) { |
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rbsp_bits(rbsp, 8, &vui->aspect_ratio_idc); |
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if (vui->aspect_ratio_idc == 255) { |
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rbsp_bits(rbsp, 16, &vui->sar_width); |
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rbsp_bits(rbsp, 16, &vui->sar_height); |
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} |
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} |
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rbsp_bit(rbsp, &vui->overscan_info_present_flag); |
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if (vui->overscan_info_present_flag) |
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rbsp_bit(rbsp, &vui->overscan_appropriate_flag); |
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rbsp_bit(rbsp, &vui->video_signal_type_present_flag); |
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if (vui->video_signal_type_present_flag) { |
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rbsp_bits(rbsp, 3, &vui->video_format); |
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rbsp_bit(rbsp, &vui->video_full_range_flag); |
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rbsp_bit(rbsp, &vui->colour_description_present_flag); |
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if (vui->colour_description_present_flag) { |
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rbsp_bits(rbsp, 8, &vui->colour_primaries); |
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rbsp_bits(rbsp, 8, &vui->transfer_characteristics); |
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rbsp_bits(rbsp, 8, &vui->matrix_coefficients); |
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} |
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} |
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rbsp_bit(rbsp, &vui->chroma_loc_info_present_flag); |
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if (vui->chroma_loc_info_present_flag) { |
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rbsp_uev(rbsp, &vui->chroma_sample_loc_type_top_field); |
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rbsp_uev(rbsp, &vui->chroma_sample_loc_type_bottom_field); |
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} |
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rbsp_bit(rbsp, &vui->timing_info_present_flag); |
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if (vui->timing_info_present_flag) { |
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rbsp_bits(rbsp, 32, &vui->num_units_in_tick); |
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rbsp_bits(rbsp, 32, &vui->time_scale); |
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rbsp_bit(rbsp, &vui->fixed_frame_rate_flag); |
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} |
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rbsp_bit(rbsp, &vui->nal_hrd_parameters_present_flag); |
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if (vui->nal_hrd_parameters_present_flag) |
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nal_h264_rbsp_hrd_parameters(rbsp, &vui->nal_hrd_parameters); |
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rbsp_bit(rbsp, &vui->vcl_hrd_parameters_present_flag); |
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if (vui->vcl_hrd_parameters_present_flag) |
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nal_h264_rbsp_hrd_parameters(rbsp, &vui->vcl_hrd_parameters); |
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if (vui->nal_hrd_parameters_present_flag || |
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vui->vcl_hrd_parameters_present_flag) |
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rbsp_bit(rbsp, &vui->low_delay_hrd_flag); |
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rbsp_bit(rbsp, &vui->pic_struct_present_flag); |
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rbsp_bit(rbsp, &vui->bitstream_restriction_flag); |
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if (vui->bitstream_restriction_flag) { |
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rbsp_bit(rbsp, &vui->motion_vectors_over_pic_boundaries_flag); |
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rbsp_uev(rbsp, &vui->max_bytes_per_pic_denom); |
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rbsp_uev(rbsp, &vui->max_bits_per_mb_denom); |
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rbsp_uev(rbsp, &vui->log2_max_mv_length_horizontal); |
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rbsp_uev(rbsp, &vui->log21_max_mv_length_vertical); |
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rbsp_uev(rbsp, &vui->max_num_reorder_frames); |
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rbsp_uev(rbsp, &vui->max_dec_frame_buffering); |
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} |
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} |
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static void nal_h264_rbsp_sps(struct rbsp *rbsp, struct nal_h264_sps *sps) |
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{ |
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unsigned int i; |
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if (!sps) { |
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rbsp->error = -EINVAL; |
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return; |
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} |
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rbsp_bits(rbsp, 8, &sps->profile_idc); |
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rbsp_bit(rbsp, &sps->constraint_set0_flag); |
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rbsp_bit(rbsp, &sps->constraint_set1_flag); |
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rbsp_bit(rbsp, &sps->constraint_set2_flag); |
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rbsp_bit(rbsp, &sps->constraint_set3_flag); |
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rbsp_bit(rbsp, &sps->constraint_set4_flag); |
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rbsp_bit(rbsp, &sps->constraint_set5_flag); |
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rbsp_bits(rbsp, 2, &sps->reserved_zero_2bits); |
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rbsp_bits(rbsp, 8, &sps->level_idc); |
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rbsp_uev(rbsp, &sps->seq_parameter_set_id); |
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if (sps->profile_idc == 100 || sps->profile_idc == 110 || |
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sps->profile_idc == 122 || sps->profile_idc == 244 || |
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sps->profile_idc == 44 || sps->profile_idc == 83 || |
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sps->profile_idc == 86 || sps->profile_idc == 118 || |
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sps->profile_idc == 128 || sps->profile_idc == 138 || |
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sps->profile_idc == 139 || sps->profile_idc == 134 || |
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sps->profile_idc == 135) { |
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rbsp_uev(rbsp, &sps->chroma_format_idc); |
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if (sps->chroma_format_idc == 3) |
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rbsp_bit(rbsp, &sps->separate_colour_plane_flag); |
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rbsp_uev(rbsp, &sps->bit_depth_luma_minus8); |
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rbsp_uev(rbsp, &sps->bit_depth_chroma_minus8); |
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rbsp_bit(rbsp, &sps->qpprime_y_zero_transform_bypass_flag); |
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rbsp_bit(rbsp, &sps->seq_scaling_matrix_present_flag); |
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if (sps->seq_scaling_matrix_present_flag) |
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rbsp->error = -EINVAL; |
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} |
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rbsp_uev(rbsp, &sps->log2_max_frame_num_minus4); |
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rbsp_uev(rbsp, &sps->pic_order_cnt_type); |
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switch (sps->pic_order_cnt_type) { |
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case 0: |
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rbsp_uev(rbsp, &sps->log2_max_pic_order_cnt_lsb_minus4); |
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break; |
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case 1: |
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rbsp_bit(rbsp, &sps->delta_pic_order_always_zero_flag); |
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rbsp_sev(rbsp, &sps->offset_for_non_ref_pic); |
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rbsp_sev(rbsp, &sps->offset_for_top_to_bottom_field); |
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rbsp_uev(rbsp, &sps->num_ref_frames_in_pic_order_cnt_cycle); |
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for (i = 0; i < sps->num_ref_frames_in_pic_order_cnt_cycle; i++) |
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rbsp_sev(rbsp, &sps->offset_for_ref_frame[i]); |
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break; |
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default: |
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rbsp->error = -EINVAL; |
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break; |
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} |
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rbsp_uev(rbsp, &sps->max_num_ref_frames); |
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rbsp_bit(rbsp, &sps->gaps_in_frame_num_value_allowed_flag); |
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rbsp_uev(rbsp, &sps->pic_width_in_mbs_minus1); |
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rbsp_uev(rbsp, &sps->pic_height_in_map_units_minus1); |
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rbsp_bit(rbsp, &sps->frame_mbs_only_flag); |
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if (!sps->frame_mbs_only_flag) |
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rbsp_bit(rbsp, &sps->mb_adaptive_frame_field_flag); |
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rbsp_bit(rbsp, &sps->direct_8x8_inference_flag); |
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rbsp_bit(rbsp, &sps->frame_cropping_flag); |
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if (sps->frame_cropping_flag) { |
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rbsp_uev(rbsp, &sps->crop_left); |
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rbsp_uev(rbsp, &sps->crop_right); |
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rbsp_uev(rbsp, &sps->crop_top); |
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rbsp_uev(rbsp, &sps->crop_bottom); |
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} |
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rbsp_bit(rbsp, &sps->vui_parameters_present_flag); |
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if (sps->vui_parameters_present_flag) |
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nal_h264_rbsp_vui_parameters(rbsp, &sps->vui); |
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} |
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static void nal_h264_rbsp_pps(struct rbsp *rbsp, struct nal_h264_pps *pps) |
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{ |
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int i; |
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rbsp_uev(rbsp, &pps->pic_parameter_set_id); |
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rbsp_uev(rbsp, &pps->seq_parameter_set_id); |
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rbsp_bit(rbsp, &pps->entropy_coding_mode_flag); |
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rbsp_bit(rbsp, &pps->bottom_field_pic_order_in_frame_present_flag); |
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rbsp_uev(rbsp, &pps->num_slice_groups_minus1); |
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if (pps->num_slice_groups_minus1 > 0) { |
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rbsp_uev(rbsp, &pps->slice_group_map_type); |
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switch (pps->slice_group_map_type) { |
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case 0: |
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for (i = 0; i < pps->num_slice_groups_minus1; i++) |
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rbsp_uev(rbsp, &pps->run_length_minus1[i]); |
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break; |
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case 2: |
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for (i = 0; i < pps->num_slice_groups_minus1; i++) { |
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rbsp_uev(rbsp, &pps->top_left[i]); |
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rbsp_uev(rbsp, &pps->bottom_right[i]); |
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} |
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break; |
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case 3: case 4: case 5: |
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rbsp_bit(rbsp, &pps->slice_group_change_direction_flag); |
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rbsp_uev(rbsp, &pps->slice_group_change_rate_minus1); |
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break; |
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case 6: |
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rbsp_uev(rbsp, &pps->pic_size_in_map_units_minus1); |
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for (i = 0; i < pps->pic_size_in_map_units_minus1; i++) |
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rbsp_bits(rbsp, |
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order_base_2(pps->num_slice_groups_minus1 + 1), |
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&pps->slice_group_id[i]); |
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break; |
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default: |
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break; |
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} |
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} |
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rbsp_uev(rbsp, &pps->num_ref_idx_l0_default_active_minus1); |
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rbsp_uev(rbsp, &pps->num_ref_idx_l1_default_active_minus1); |
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rbsp_bit(rbsp, &pps->weighted_pred_flag); |
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rbsp_bits(rbsp, 2, &pps->weighted_bipred_idc); |
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rbsp_sev(rbsp, &pps->pic_init_qp_minus26); |
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rbsp_sev(rbsp, &pps->pic_init_qs_minus26); |
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rbsp_sev(rbsp, &pps->chroma_qp_index_offset); |
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rbsp_bit(rbsp, &pps->deblocking_filter_control_present_flag); |
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rbsp_bit(rbsp, &pps->constrained_intra_pred_flag); |
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rbsp_bit(rbsp, &pps->redundant_pic_cnt_present_flag); |
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if (/* more_rbsp_data() */ false) { |
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rbsp_bit(rbsp, &pps->transform_8x8_mode_flag); |
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rbsp_bit(rbsp, &pps->pic_scaling_matrix_present_flag); |
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if (pps->pic_scaling_matrix_present_flag) |
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rbsp->error = -EINVAL; |
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rbsp_sev(rbsp, &pps->second_chroma_qp_index_offset); |
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} |
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} |
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|
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/** |
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* nal_h264_write_sps() - Write SPS NAL unit into RBSP format |
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* @dev: device pointer |
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* @dest: the buffer that is filled with RBSP data |
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* @n: maximum size of @dest in bytes |
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* @sps: &struct nal_h264_sps to convert to RBSP |
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* |
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* Convert @sps to RBSP data and write it into @dest. |
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* |
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* The size of the SPS NAL unit is not known in advance and this function will |
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* fail, if @dest does not hold sufficient space for the SPS NAL unit. |
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* |
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* Return: number of bytes written to @dest or negative error code |
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*/ |
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ssize_t nal_h264_write_sps(const struct device *dev, |
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void *dest, size_t n, struct nal_h264_sps *sps) |
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{ |
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struct rbsp rbsp; |
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unsigned int forbidden_zero_bit = 0; |
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unsigned int nal_ref_idc = 0; |
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unsigned int nal_unit_type = SEQUENCE_PARAMETER_SET; |
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|
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if (!dest) |
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return -EINVAL; |
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|
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rbsp_init(&rbsp, dest, n, &write); |
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|
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nal_h264_write_start_code_prefix(&rbsp); |
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|
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rbsp_bit(&rbsp, &forbidden_zero_bit); |
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rbsp_bits(&rbsp, 2, &nal_ref_idc); |
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rbsp_bits(&rbsp, 5, &nal_unit_type); |
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|
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nal_h264_rbsp_sps(&rbsp, sps); |
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|
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rbsp_trailing_bits(&rbsp); |
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|
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if (rbsp.error) |
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return rbsp.error; |
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|
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return DIV_ROUND_UP(rbsp.pos, 8); |
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} |
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EXPORT_SYMBOL_GPL(nal_h264_write_sps); |
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|
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/** |
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* nal_h264_read_sps() - Read SPS NAL unit from RBSP format |
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* @dev: device pointer |
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* @sps: the &struct nal_h264_sps to fill from the RBSP data |
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* @src: the buffer that contains the RBSP data |
|
* @n: size of @src in bytes |
|
* |
|
* Read RBSP data from @src and use it to fill @sps. |
|
* |
|
* Return: number of bytes read from @src or negative error code |
|
*/ |
|
ssize_t nal_h264_read_sps(const struct device *dev, |
|
struct nal_h264_sps *sps, void *src, size_t n) |
|
{ |
|
struct rbsp rbsp; |
|
unsigned int forbidden_zero_bit; |
|
unsigned int nal_ref_idc; |
|
unsigned int nal_unit_type; |
|
|
|
if (!src) |
|
return -EINVAL; |
|
|
|
rbsp_init(&rbsp, src, n, &read); |
|
|
|
nal_h264_read_start_code_prefix(&rbsp); |
|
|
|
rbsp_bit(&rbsp, &forbidden_zero_bit); |
|
rbsp_bits(&rbsp, 2, &nal_ref_idc); |
|
rbsp_bits(&rbsp, 5, &nal_unit_type); |
|
|
|
if (rbsp.error || |
|
forbidden_zero_bit != 0 || |
|
nal_ref_idc != 0 || |
|
nal_unit_type != SEQUENCE_PARAMETER_SET) |
|
return -EINVAL; |
|
|
|
nal_h264_rbsp_sps(&rbsp, sps); |
|
|
|
rbsp_trailing_bits(&rbsp); |
|
|
|
if (rbsp.error) |
|
return rbsp.error; |
|
|
|
return DIV_ROUND_UP(rbsp.pos, 8); |
|
} |
|
EXPORT_SYMBOL_GPL(nal_h264_read_sps); |
|
|
|
/** |
|
* nal_h264_write_pps() - Write PPS NAL unit into RBSP format |
|
* @dev: device pointer |
|
* @dest: the buffer that is filled with RBSP data |
|
* @n: maximum size of @dest in bytes |
|
* @pps: &struct nal_h264_pps to convert to RBSP |
|
* |
|
* Convert @pps to RBSP data and write it into @dest. |
|
* |
|
* The size of the PPS NAL unit is not known in advance and this function will |
|
* fail, if @dest does not hold sufficient space for the PPS NAL unit. |
|
* |
|
* Return: number of bytes written to @dest or negative error code |
|
*/ |
|
ssize_t nal_h264_write_pps(const struct device *dev, |
|
void *dest, size_t n, struct nal_h264_pps *pps) |
|
{ |
|
struct rbsp rbsp; |
|
unsigned int forbidden_zero_bit = 0; |
|
unsigned int nal_ref_idc = 0; |
|
unsigned int nal_unit_type = PICTURE_PARAMETER_SET; |
|
|
|
if (!dest) |
|
return -EINVAL; |
|
|
|
rbsp_init(&rbsp, dest, n, &write); |
|
|
|
nal_h264_write_start_code_prefix(&rbsp); |
|
|
|
/* NAL unit header */ |
|
rbsp_bit(&rbsp, &forbidden_zero_bit); |
|
rbsp_bits(&rbsp, 2, &nal_ref_idc); |
|
rbsp_bits(&rbsp, 5, &nal_unit_type); |
|
|
|
nal_h264_rbsp_pps(&rbsp, pps); |
|
|
|
rbsp_trailing_bits(&rbsp); |
|
|
|
if (rbsp.error) |
|
return rbsp.error; |
|
|
|
return DIV_ROUND_UP(rbsp.pos, 8); |
|
} |
|
EXPORT_SYMBOL_GPL(nal_h264_write_pps); |
|
|
|
/** |
|
* nal_h264_read_pps() - Read PPS NAL unit from RBSP format |
|
* @dev: device pointer |
|
* @pps: the &struct nal_h264_pps to fill from the RBSP data |
|
* @src: the buffer that contains the RBSP data |
|
* @n: size of @src in bytes |
|
* |
|
* Read RBSP data from @src and use it to fill @pps. |
|
* |
|
* Return: number of bytes read from @src or negative error code |
|
*/ |
|
ssize_t nal_h264_read_pps(const struct device *dev, |
|
struct nal_h264_pps *pps, void *src, size_t n) |
|
{ |
|
struct rbsp rbsp; |
|
|
|
if (!src) |
|
return -EINVAL; |
|
|
|
rbsp_init(&rbsp, src, n, &read); |
|
|
|
nal_h264_read_start_code_prefix(&rbsp); |
|
|
|
/* NAL unit header */ |
|
rbsp.pos += 8; |
|
|
|
nal_h264_rbsp_pps(&rbsp, pps); |
|
|
|
rbsp_trailing_bits(&rbsp); |
|
|
|
if (rbsp.error) |
|
return rbsp.error; |
|
|
|
return DIV_ROUND_UP(rbsp.pos, 8); |
|
} |
|
EXPORT_SYMBOL_GPL(nal_h264_read_pps); |
|
|
|
/** |
|
* nal_h264_write_filler() - Write filler data RBSP |
|
* @dev: device pointer |
|
* @dest: buffer to fill with filler data |
|
* @n: size of the buffer to fill with filler data |
|
* |
|
* Write a filler data RBSP to @dest with a size of @n bytes and return the |
|
* number of written filler data bytes. |
|
* |
|
* Use this function to generate dummy data in an RBSP data stream that can be |
|
* safely ignored by h264 decoders. |
|
* |
|
* The RBSP format of the filler data is specified in Rec. ITU-T H.264 |
|
* (04/2017) 7.3.2.7 Filler data RBSP syntax. |
|
* |
|
* Return: number of filler data bytes (including marker) or negative error |
|
*/ |
|
ssize_t nal_h264_write_filler(const struct device *dev, void *dest, size_t n) |
|
{ |
|
struct rbsp rbsp; |
|
unsigned int forbidden_zero_bit = 0; |
|
unsigned int nal_ref_idc = 0; |
|
unsigned int nal_unit_type = FILLER_DATA; |
|
|
|
if (!dest) |
|
return -EINVAL; |
|
|
|
rbsp_init(&rbsp, dest, n, &write); |
|
|
|
nal_h264_write_start_code_prefix(&rbsp); |
|
|
|
rbsp_bit(&rbsp, &forbidden_zero_bit); |
|
rbsp_bits(&rbsp, 2, &nal_ref_idc); |
|
rbsp_bits(&rbsp, 5, &nal_unit_type); |
|
|
|
nal_h264_write_filler_data(&rbsp); |
|
|
|
rbsp_trailing_bits(&rbsp); |
|
|
|
return DIV_ROUND_UP(rbsp.pos, 8); |
|
} |
|
EXPORT_SYMBOL_GPL(nal_h264_write_filler); |
|
|
|
/** |
|
* nal_h264_read_filler() - Read filler data RBSP |
|
* @dev: device pointer |
|
* @src: buffer with RBSP data that is read |
|
* @n: maximum size of src that shall be read |
|
* |
|
* Read a filler data RBSP from @src up to a maximum size of @n bytes and |
|
* return the size of the filler data in bytes including the marker. |
|
* |
|
* This function is used to parse filler data and skip the respective bytes in |
|
* the RBSP data. |
|
* |
|
* The RBSP format of the filler data is specified in Rec. ITU-T H.264 |
|
* (04/2017) 7.3.2.7 Filler data RBSP syntax. |
|
* |
|
* Return: number of filler data bytes (including marker) or negative error |
|
*/ |
|
ssize_t nal_h264_read_filler(const struct device *dev, void *src, size_t n) |
|
{ |
|
struct rbsp rbsp; |
|
unsigned int forbidden_zero_bit; |
|
unsigned int nal_ref_idc; |
|
unsigned int nal_unit_type; |
|
|
|
if (!src) |
|
return -EINVAL; |
|
|
|
rbsp_init(&rbsp, src, n, &read); |
|
|
|
nal_h264_read_start_code_prefix(&rbsp); |
|
|
|
rbsp_bit(&rbsp, &forbidden_zero_bit); |
|
rbsp_bits(&rbsp, 2, &nal_ref_idc); |
|
rbsp_bits(&rbsp, 5, &nal_unit_type); |
|
|
|
if (rbsp.error) |
|
return rbsp.error; |
|
if (forbidden_zero_bit != 0 || |
|
nal_ref_idc != 0 || |
|
nal_unit_type != FILLER_DATA) |
|
return -EINVAL; |
|
|
|
nal_h264_read_filler_data(&rbsp); |
|
rbsp_trailing_bits(&rbsp); |
|
|
|
if (rbsp.error) |
|
return rbsp.error; |
|
|
|
return DIV_ROUND_UP(rbsp.pos, 8); |
|
} |
|
EXPORT_SYMBOL_GPL(nal_h264_read_filler);
|
|
|