mirror of
https://github.com/ZLMediaKit/ZLMediaKit.git
synced 2026-07-28 21:14:03 +08:00
594 lines
21 KiB
C++
594 lines
21 KiB
C++
/*
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* Copyright (c) 2016-present The ZLMediaKit project authors. All Rights Reserved.
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*
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* This file is part of ZLMediaKit(https://github.com/ZLMediaKit/ZLMediaKit).
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*
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* Use of this source code is governed by MIT-like license that can be found in the
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* LICENSE file in the root of the source tree. All contributing project authors
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* may be found in the AUTHORS file in the root of the source tree.
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*/
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#include "H264.h"
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#include "H264Rtmp.h"
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#include "H264Rtp.h"
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#include "Util/logger.h"
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#include "Util/base64.h"
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#include "Common/Parser.h"
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#include "Common/config.h"
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#include "Extension/Factory.h"
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#ifdef ENABLE_MP4
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#include "mpeg4-avc.h"
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#endif
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#include <vector>
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#include <stdexcept>
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using namespace std;
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using namespace toolkit;
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namespace mediakit {
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// ---- 内部比特流工具 ----
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namespace {
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// 去除 RBSP 防竞争字节 (0x00 0x00 0x03 -> 0x00 0x00)
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static std::vector<uint8_t> rbsp_from_nalu(const uint8_t *data, size_t size) {
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std::vector<uint8_t> out;
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out.reserve(size);
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for (size_t i = 0; i < size; ) {
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if (i + 2 < size && data[i] == 0x00 && data[i+1] == 0x00 && data[i+2] == 0x03) {
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out.push_back(0x00);
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out.push_back(0x00);
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i += 3;
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} else {
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out.push_back(data[i++]);
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}
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}
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return out;
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}
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struct BitStream {
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const uint8_t *buf;
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size_t size; // bytes
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size_t pos; // bit position
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BitStream(const uint8_t *b, size_t s) : buf(b), size(s), pos(0) {}
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bool eof() const { return pos >= size * 8; }
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size_t bits_left() const { return size * 8 - pos; }
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uint32_t read_bits(int n) {
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if (n < 0 || n > 32 || (size_t)n > bits_left()) {
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throw std::runtime_error("eof");
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}
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uint32_t val = 0;
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for (int i = 0; i < n; i++) {
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val = (val << 1) | ((buf[pos / 8] >> (7 - pos % 8)) & 1);
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pos++;
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}
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return val;
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}
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void skip_bits(int n) {
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if (n < 0 || (size_t)n > bits_left()) {
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throw std::runtime_error("eof");
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}
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pos += n;
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}
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uint32_t read_ue() { // Exp-Golomb unsigned
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int zeros = 0;
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while (!eof() && read_bits(1) == 0) zeros++;
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if (zeros == 0) return 0;
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if (zeros >= 32) throw std::runtime_error("exp-golomb overflow");
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return (1u << zeros) - 1 + read_bits(zeros);
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}
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int32_t read_se() { // Exp-Golomb signed
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uint32_t v = read_ue();
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return (v & 1) ? (int32_t)((v + 1) >> 1) : -(int32_t)(v >> 1);
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}
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};
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} // anonymous namespace
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// ---- H264 SPS 解析 ----
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static bool getAVCInfo(const char *sps_raw, size_t sps_len, int &iVideoWidth, int &iVideoHeight, float &iVideoFps) {
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if (sps_len < 4) return false;
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// sps_raw[0] 是 NAL header，从第 1 字节开始是 RBSP
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auto rbsp = rbsp_from_nalu((const uint8_t *)sps_raw + 1, sps_len - 1);
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if (rbsp.size() < 3) return false;
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try {
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BitStream bs(rbsp.data(), rbsp.size());
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uint8_t profile_idc = (uint8_t)bs.read_bits(8); // profile_idc
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bs.skip_bits(8); // constraint flags + reserved
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bs.skip_bits(8); // level_idc
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bs.read_ue(); // seq_parameter_set_id
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uint32_t chroma_format_idc = 1;
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if (profile_idc == 100 || profile_idc == 110 || profile_idc == 122 ||
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profile_idc == 244 || profile_idc == 44 || profile_idc == 83 ||
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profile_idc == 86 || profile_idc == 118 || profile_idc == 128) {
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chroma_format_idc = bs.read_ue();
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if (chroma_format_idc > 3) {
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return false;
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}
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if (chroma_format_idc == 3) bs.skip_bits(1); // separate_colour_plane_flag
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bs.read_ue(); // bit_depth_luma_minus8
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bs.read_ue(); // bit_depth_chroma_minus8
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bs.skip_bits(1); // qpprime_y_zero_transform_bypass_flag
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if (bs.read_bits(1)) { // seq_scaling_matrix_present_flag
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int cnt = (chroma_format_idc != 3) ? 8 : 12;
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for (int i = 0; i < cnt; i++) {
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if (bs.read_bits(1)) { // seq_scaling_list_present_flag
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int sz = (i < 6) ? 16 : 64;
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int last = 8, next = 8;
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for (int j = 0; j < sz; j++) {
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if (next != 0) next = (last + bs.read_se() + 256) % 256;
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last = (next == 0) ? last : next;
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}
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}
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}
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}
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}
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bs.read_ue(); // log2_max_frame_num_minus4
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uint32_t pic_order_cnt_type = bs.read_ue();
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if (pic_order_cnt_type == 0) {
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bs.read_ue(); // log2_max_pic_order_cnt_lsb_minus4
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} else if (pic_order_cnt_type == 1) {
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bs.skip_bits(1); // delta_pic_order_always_zero_flag
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bs.read_se(); // offset_for_non_ref_pic
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bs.read_se(); // offset_for_top_to_bottom_field
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uint32_t n = bs.read_ue();
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for (uint32_t i = 0; i < n; i++) bs.read_se();
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}
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bs.read_ue(); // max_num_ref_frames
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bs.skip_bits(1); // gaps_in_frame_num_value_allowed_flag
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uint32_t pic_width_in_mbs_minus1 = bs.read_ue();
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uint32_t pic_height_in_map_units_minus1 = bs.read_ue();
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uint32_t frame_mbs_only_flag = bs.read_bits(1);
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if (!frame_mbs_only_flag) bs.skip_bits(1); // mb_adaptive_frame_field_flag
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bs.skip_bits(1); // direct_8x8_inference_flag
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uint32_t crop_left = 0, crop_right = 0, crop_top = 0, crop_bottom = 0;
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if (bs.read_bits(1)) { // frame_cropping_flag
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crop_left = bs.read_ue();
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crop_right = bs.read_ue();
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crop_top = bs.read_ue();
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crop_bottom = bs.read_ue();
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}
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uint32_t crop_unit_x = 1;
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uint32_t crop_unit_y = 2 - frame_mbs_only_flag;
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if (chroma_format_idc == 1) {
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crop_unit_x = 2;
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crop_unit_y = 2 * (2 - frame_mbs_only_flag);
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} else if (chroma_format_idc == 2) {
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crop_unit_x = 2;
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crop_unit_y = 2 - frame_mbs_only_flag;
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}
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uint64_t raw_width = (uint64_t)(pic_width_in_mbs_minus1 + 1) * 16;
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uint64_t raw_height = (uint64_t)(pic_height_in_map_units_minus1 + 1) * 16 * (2 - frame_mbs_only_flag);
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uint64_t crop_w = ((uint64_t)crop_left + crop_right) * crop_unit_x;
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uint64_t crop_h = ((uint64_t)crop_top + crop_bottom) * crop_unit_y;
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if (crop_w >= raw_width || crop_h >= raw_height) return false;
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iVideoWidth = (int)(raw_width - crop_w);
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iVideoHeight = (int)(raw_height - crop_h);
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iVideoFps = 0.0f;
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if (bs.read_bits(1)) { // vui_parameters_present_flag
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if (bs.read_bits(1)) { // aspect_ratio_info_present_flag
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uint32_t ar = bs.read_bits(8);
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if (ar == 255) bs.skip_bits(32); // sar width+height
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}
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if (bs.read_bits(1)) bs.skip_bits(1); // overscan
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if (bs.read_bits(1)) { // video_signal_type_present_flag
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bs.skip_bits(3 + 1); // video_format + video_full_range_flag
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if (bs.read_bits(1)) bs.skip_bits(24); // colour_description_present_flag
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}
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if (bs.read_bits(1)) { // chroma_loc_info_present_flag
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bs.read_ue(); bs.read_ue();
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}
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if (bs.read_bits(1)) { // timing_info_present_flag
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uint32_t num_units_in_tick = bs.read_bits(32);
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uint32_t time_scale = bs.read_bits(32);
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bs.skip_bits(1); // fixed_frame_rate_flag
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if (num_units_in_tick > 0) {
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iVideoFps = (float)time_scale / (2.0f * (float)num_units_in_tick);
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}
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}
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}
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return iVideoWidth > 0 && iVideoHeight > 0;
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} catch (...) {
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return iVideoWidth > 0 && iVideoHeight > 0;
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}
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}
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bool getAVCInfo(const string &strSps, int &iVideoWidth, int &iVideoHeight, float &iVideoFps) {
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return getAVCInfo(strSps.data(), strSps.size(), iVideoWidth, iVideoHeight, iVideoFps);
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}
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static const char *memfind(const char *buf, ssize_t len, const char *subbuf, ssize_t sublen) {
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for (auto i = 0; i < len - sublen; ++i) {
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if (memcmp(buf + i, subbuf, sublen) == 0) {
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return buf + i;
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}
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}
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return NULL;
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}
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void splitH264(
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const char *ptr, size_t len, size_t prefix, const std::function<void(const char *, size_t, size_t)> &cb) {
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auto start = ptr + prefix;
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auto end = ptr + len;
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size_t next_prefix;
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while (true) {
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auto next_start = memfind(start, end - start, "\x00\x00\x01", 3);
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if (next_start) {
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// 找到下一帧 [AUTO-TRANSLATED:7161f54a]
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// Find the next frame
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if (*(next_start - 1) == 0x00) {
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// 这个是00 00 00 01开头 [AUTO-TRANSLATED:b0d79e9e]
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// This starts with 00 00 00 01
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next_start -= 1;
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next_prefix = 4;
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} else {
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// 这个是00 00 01开头 [AUTO-TRANSLATED:18ae81d8]
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// This starts with 00 00 01
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next_prefix = 3;
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}
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// 记得加上本帧prefix长度 [AUTO-TRANSLATED:8bde5d52]
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// Remember to add the prefix length of this frame
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cb(start - prefix, next_start - start + prefix, prefix);
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// 搜索下一帧末尾的起始位置 [AUTO-TRANSLATED:8976b719]
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// Search for the starting position of the end of the next frame
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start = next_start + next_prefix;
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// 记录下一帧的prefix长度 [AUTO-TRANSLATED:756aee4e]
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// Record the prefix length of the next frame
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prefix = next_prefix;
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continue;
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}
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// 未找到下一帧,这是最后一帧 [AUTO-TRANSLATED:58365453]
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// The next frame was not found, this is the last frame
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cb(start - prefix, end - start + prefix, prefix);
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break;
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}
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}
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size_t prefixSize(const char *ptr, size_t len) {
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if (len < 4) {
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return 0;
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}
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if (ptr[0] != 0x00 || ptr[1] != 0x00) {
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// 不是0x00 00开头 [AUTO-TRANSLATED:c406f0da]
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// Not 0x00 00 at the beginning
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return 0;
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}
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if (ptr[2] == 0x00 && ptr[3] == 0x01) {
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// 是0x00 00 00 01 [AUTO-TRANSLATED:70caae72]
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// It is 0x00 00 00 01
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return 4;
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}
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if (ptr[2] == 0x01) {
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// 是0x00 00 01 [AUTO-TRANSLATED:78b4a3c9]
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// It is 0x00 00 01
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return 3;
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}
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return 0;
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}
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////////////////////////////////////////////////////////////////////////////////////////////////////
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H264Track::H264Track(const string &sps, const string &pps, int sps_prefix_len, int pps_prefix_len) {
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_sps = sps.substr(sps_prefix_len);
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_pps = pps.substr(pps_prefix_len);
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H264Track::update();
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}
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CodecId H264Track::getCodecId() const {
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return CodecH264;
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}
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int H264Track::getVideoHeight() const {
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return _height;
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}
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int H264Track::getVideoWidth() const {
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return _width;
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}
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float H264Track::getVideoFps() const {
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return _fps;
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}
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bool H264Track::ready() const {
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return !_sps.empty() && !_pps.empty();
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}
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bool H264Track::inputFrame(const Frame::Ptr &frame) {
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using H264FrameInternal = FrameInternal<H264FrameNoCacheAble>;
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int type = H264_TYPE(frame->data()[frame->prefixSize()]);
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if ((type == H264Frame::NAL_B_P || type == H264Frame::NAL_IDR) && ready()) {
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return inputFrame_l(frame);
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}
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// 非I/B/P帧情况下，split一下，防止多个帧粘合在一起 [AUTO-TRANSLATED:b69c6e75]
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// In the case of non-I/B/P frames, split it to prevent multiple frames from sticking together
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bool ret = false;
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splitH264(frame->data(), frame->size(), frame->prefixSize(), [&](const char *ptr, size_t len, size_t prefix) {
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H264FrameInternal::Ptr sub_frame = std::make_shared<H264FrameInternal>(frame, (char *)ptr, len, prefix);
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if (inputFrame_l(sub_frame)) {
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ret = true;
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}
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});
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return ret;
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}
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toolkit::Buffer::Ptr H264Track::getExtraData() const {
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CHECK(ready());
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#ifdef ENABLE_MP4
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struct mpeg4_avc_t avc;
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memset(&avc, 0, sizeof(avc));
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string sps_pps = string("\x00\x00\x00\x01", 4) + _sps + string("\x00\x00\x00\x01", 4) + _pps;
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h264_annexbtomp4(&avc, sps_pps.data(), (int)sps_pps.size(), NULL, 0, NULL, NULL);
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std::string extra_data;
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extra_data.resize(1024);
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auto extra_data_size = mpeg4_avc_decoder_configuration_record_save(&avc, (uint8_t *)extra_data.data(), extra_data.size());
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if (extra_data_size == -1) {
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WarnL << "生成H264 extra_data 失败";
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return nullptr;
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}
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extra_data.resize(extra_data_size);
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return std::make_shared<BufferString>(std::move(extra_data));
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#else
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std::string extra_data;
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// AVCDecoderConfigurationRecord start
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extra_data.push_back(1); // version
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extra_data.push_back(_sps[1]); // profile
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extra_data.push_back(_sps[2]); // compat
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extra_data.push_back(_sps[3]); // level
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extra_data.push_back((char)0xff); // 6 bits reserved + 2 bits nal size length - 1 (11)
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extra_data.push_back((char)0xe1); // 3 bits reserved + 5 bits number of sps (00001)
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// sps
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uint16_t size = (uint16_t)_sps.size();
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size = htons(size);
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extra_data.append((char *)&size, 2);
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extra_data.append(_sps);
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// pps
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extra_data.push_back(1); // version
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size = (uint16_t)_pps.size();
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size = htons(size);
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extra_data.append((char *)&size, 2);
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extra_data.append(_pps);
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return std::make_shared<BufferString>(std::move(extra_data));
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#endif
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}
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void H264Track::setExtraData(const uint8_t *data, size_t bytes) {
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#ifdef ENABLE_MP4
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struct mpeg4_avc_t avc;
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memset(&avc, 0, sizeof(avc));
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if (mpeg4_avc_decoder_configuration_record_load(data, bytes, &avc) > 0) {
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std::vector<uint8_t> config(bytes * 2);
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int size = mpeg4_avc_to_nalu(&avc, config.data(), bytes * 2);
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if (size > 4) {
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splitH264((char *)config.data(), size, 4, [&](const char *ptr, size_t len, size_t prefix) {
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inputFrame_l(std::make_shared<H264FrameNoCacheAble>((char *)ptr, len, 0, 0, prefix));
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});
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update();
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}
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}
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#else
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CHECK(bytes >= 8); // 6 + 2
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size_t offset = 6;
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uint16_t sps_size = data[offset] << 8 | data[offset + 1];
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auto sps_ptr = data + offset + 2;
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offset += (2 + sps_size);
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CHECK(bytes >= offset + 2); // + pps_size
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_sps.assign((char *)sps_ptr, sps_size);
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uint16_t pps_size = data[offset] << 8 | data[offset + 1];
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auto pps_ptr = data + offset + 2;
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offset += (2 + pps_size);
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CHECK(bytes >= offset);
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_pps.assign((char *)pps_ptr, pps_size);
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update();
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#endif
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}
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bool H264Track::update() {
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return getAVCInfo(_sps, _width, _height, _fps);
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}
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std::vector<Frame::Ptr> H264Track::getConfigFrames() const {
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if (!ready()) {
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return {};
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}
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return { createConfigFrame<H264Frame>(_sps, 0, getIndex()),
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createConfigFrame<H264Frame>(_pps, 0, getIndex()) };
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}
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Track::Ptr H264Track::clone() const {
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return std::make_shared<H264Track>(*this);
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}
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bool H264Track::inputFrame_l(const Frame::Ptr &frame) {
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int type = H264_TYPE(frame->data()[frame->prefixSize()]);
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if (type == H264Frame::NAL_AUD) {
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// AUD帧丢弃
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return false;
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}
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bool ret = true;
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||
switch (type) {
|
||
case H264Frame::NAL_SPS: {
|
||
_sps = string(frame->data() + frame->prefixSize(), frame->size() - frame->prefixSize());
|
||
_latest_is_sps = true;
|
||
ret = VideoTrack::inputFrame(frame);
|
||
break;
|
||
}
|
||
case H264Frame::NAL_PPS: {
|
||
_pps = string(frame->data() + frame->prefixSize(), frame->size() - frame->prefixSize());
|
||
_latest_is_pps = true;
|
||
ret = VideoTrack::inputFrame(frame);
|
||
break;
|
||
}
|
||
default:
|
||
// 避免识别不出关键帧 [AUTO-TRANSLATED:8eb84679]
|
||
// Avoid not being able to recognize keyframes
|
||
if (latestIsConfigFrame() && !frame->dropAble()) {
|
||
if (!frame->keyFrame()) {
|
||
const_cast<Frame::Ptr &>(frame) = std::make_shared<FrameCacheAble>(frame, true);
|
||
}
|
||
}
|
||
// 判断是否是I帧, 并且如果是,那判断前面是否插入过config帧, 如果插入过就不插入了 [AUTO-TRANSLATED:40733cd8]
|
||
// Determine if it is an I frame, and if it is, determine if a config frame has been inserted before, and if it has been inserted, do not insert it
|
||
if (frame->keyFrame() && !latestIsConfigFrame()) {
|
||
insertConfigFrame(frame);
|
||
}
|
||
if(!frame->dropAble()){
|
||
_latest_is_pps = false;
|
||
_latest_is_sps = false;
|
||
}
|
||
ret = VideoTrack::inputFrame(frame);
|
||
break;
|
||
}
|
||
|
||
if (_width == 0 && ready()) {
|
||
update();
|
||
}
|
||
return ret;
|
||
}
|
||
|
||
void H264Track::insertConfigFrame(const Frame::Ptr &frame) {
|
||
if (!_sps.empty()) {
|
||
VideoTrack::inputFrame(createConfigFrame<H264Frame>(_sps, frame->dts(), frame->getIndex()));
|
||
}
|
||
|
||
if (!_pps.empty()) {
|
||
VideoTrack::inputFrame(createConfigFrame<H264Frame>(_pps, frame->dts(), frame->getIndex()));
|
||
}
|
||
}
|
||
|
||
bool H264Track::latestIsConfigFrame(){
|
||
return _latest_is_sps && _latest_is_pps;
|
||
}
|
||
|
||
class H264Sdp : public Sdp {
|
||
public:
|
||
H264Sdp(const string &strSPS, const string &strPPS, int payload_type, int bitrate) : Sdp(90000, payload_type) {
|
||
_printer << "m=video 0 RTP/AVP " << payload_type << "\r\n";
|
||
if (bitrate) {
|
||
_printer << "b=AS:" << bitrate << "\r\n";
|
||
}
|
||
_printer << "a=rtpmap:" << payload_type << " " << getCodecName(CodecH264) << "/" << 90000 << "\r\n";
|
||
|
||
/**
|
||
Single NAI Unit Mode = 0. // Single NAI mode (Only nals from 1-23 are allowed)
|
||
Non Interleaved Mode = 1，// Non-interleaved Mode: 1-23，24 (STAP-A)，28 (FU-A) are allowed
|
||
Interleaved Mode = 2, // 25 (STAP-B)，26 (MTAP16)，27 (MTAP24)，28 (EU-A)，and 29 (EU-B) are allowed.
|
||
Single NAI Unit Mode = 0. // Single NAI mode (Only nals from 1-23 are allowed)
|
||
Non Interleaved Mode = 1，// Non-interleaved Mode: 1-23，24 (STAP-A)，28 (FU-A) are allowed
|
||
Interleaved Mode = 2, // 25 (STAP-B)，26 (MTAP16)，27 (MTAP24)，28 (EU-A)，and 29 (EU-B) are allowed.
|
||
*
|
||
* [AUTO-TRANSLATED:6166738f]
|
||
**/
|
||
GET_CONFIG(bool, h264_stap_a, Rtp::kH264StapA);
|
||
_printer << "a=fmtp:" << payload_type << " packetization-mode=" << h264_stap_a << "; profile-level-id=";
|
||
|
||
uint32_t profile_level_id = 0;
|
||
if (strSPS.length() >= 4) { // sanity check
|
||
profile_level_id = (uint8_t(strSPS[1]) << 16) |
|
||
(uint8_t(strSPS[2]) << 8) |
|
||
(uint8_t(strSPS[3])); // profile_idc|constraint_setN_flag|level_idc
|
||
}
|
||
|
||
char profile[8];
|
||
snprintf(profile, sizeof(profile), "%06X", profile_level_id);
|
||
_printer << profile;
|
||
_printer << "; sprop-parameter-sets=";
|
||
_printer << encodeBase64(strSPS) << ",";
|
||
_printer << encodeBase64(strPPS) << "\r\n";
|
||
}
|
||
|
||
string getSdp() const { return _printer; }
|
||
|
||
private:
|
||
_StrPrinter _printer;
|
||
};
|
||
|
||
Sdp::Ptr H264Track::getSdp(uint8_t payload_type) const {
|
||
return std::make_shared<H264Sdp>(_sps, _pps, payload_type, getBitRate() >> 10);
|
||
}
|
||
|
||
namespace {
|
||
|
||
CodecId getCodec() {
|
||
return CodecH264;
|
||
}
|
||
|
||
Track::Ptr getTrackByCodecId(int sample_rate, int channels, int sample_bit) {
|
||
return std::make_shared<H264Track>();
|
||
}
|
||
|
||
Track::Ptr getTrackBySdp(const SdpTrack::Ptr &track) {
|
||
//a=fmtp:96 packetization-mode=1;profile-level-id=42C01F;sprop-parameter-sets=Z0LAH9oBQBboQAAAAwBAAAAPI8YMqA==,aM48gA==
|
||
auto map = Parser::parseArgs(track->_fmtp, ";", "=");
|
||
auto sps_pps = map["sprop-parameter-sets"];
|
||
string base64_SPS = findSubString(sps_pps.data(), NULL, ",");
|
||
string base64_PPS = findSubString(sps_pps.data(), ",", NULL);
|
||
auto sps = decodeBase64(base64_SPS);
|
||
auto pps = decodeBase64(base64_PPS);
|
||
if (sps.empty() || pps.empty()) {
|
||
// 如果sdp里面没有sps/pps,那么可能在后续的rtp里面恢复出sps/pps [AUTO-TRANSLATED:60f03d45]
|
||
// If there is no sps/pps in the sdp, then it may be possible to recover the sps/pps in the subsequent rtp
|
||
return std::make_shared<H264Track>();
|
||
}
|
||
return std::make_shared<H264Track>(sps, pps, prefixSize(sps.data(), sps.size()), prefixSize(pps.data(), pps.size()));
|
||
}
|
||
|
||
RtpCodec::Ptr getRtpEncoderByCodecId(uint8_t pt) {
|
||
return std::make_shared<H264RtpEncoder>();
|
||
}
|
||
|
||
RtpCodec::Ptr getRtpDecoderByCodecId() {
|
||
return std::make_shared<H264RtpDecoder>();
|
||
}
|
||
|
||
RtmpCodec::Ptr getRtmpEncoderByTrack(const Track::Ptr &track) {
|
||
return std::make_shared<H264RtmpEncoder>(track);
|
||
}
|
||
|
||
RtmpCodec::Ptr getRtmpDecoderByTrack(const Track::Ptr &track) {
|
||
return std::make_shared<H264RtmpDecoder>(track);
|
||
}
|
||
|
||
Frame::Ptr getFrameFromPtr(const char *data, size_t bytes, uint64_t dts, uint64_t pts) {
|
||
return std::make_shared<H264FrameNoCacheAble>((char *)data, bytes, dts, pts, prefixSize(data, bytes));
|
||
}
|
||
|
||
} // namespace
|
||
|
||
CodecPlugin h264_plugin = { getCodec,
|
||
getTrackByCodecId,
|
||
getTrackBySdp,
|
||
getRtpEncoderByCodecId,
|
||
getRtpDecoderByCodecId,
|
||
getRtmpEncoderByTrack,
|
||
getRtmpDecoderByTrack,
|
||
getFrameFromPtr };
|
||
|
||
} // namespace mediakit
|