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liqinghua
2026-04-26 21:35:04 +08:00
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main/audio/demuxer/ogg_demuxer.cc Normal file
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#include "ogg_demuxer.h"
#include "esp_log.h"
#define TAG "OggDemuxer"
/// @brief 重置解封器
void OggDemuxer::Reset()
{
opus_info_ = {
.head_seen = false,
.tags_seen = false,
.sample_rate = 48000
};
state_ = ParseState::FIND_PAGE;
ctx_.packet_len = 0;
ctx_.seg_count = 0;
ctx_.seg_index = 0;
ctx_.data_offset = 0;
ctx_.bytes_needed = 4; // 需要4字节"OggS"
ctx_.seg_remaining = 0;
ctx_.body_size = 0;
ctx_.body_offset = 0;
ctx_.packet_continued = false;
// 清空缓冲区数据
memset(ctx_.header, 0, sizeof(ctx_.header));
memset(ctx_.seg_table, 0, sizeof(ctx_.seg_table));
memset(ctx_.packet_buf, 0, sizeof(ctx_.packet_buf));
}
/// @brief 处理数据块
/// @param data 输入数据
/// @param size 输入数据大小
/// @return 已处理的字节数
size_t OggDemuxer::Process(const uint8_t* data, size_t size)
{
size_t processed = 0; // 已处理的字节数
while (processed < size) {
switch (state_) {
case ParseState::FIND_PAGE: {
// 寻找页头"OggS"
if (ctx_.bytes_needed < 4) {
// 处理不完整的"OggS"匹配（跨数据块）
size_t to_copy = std::min(size - processed, ctx_.bytes_needed);
memcpy(ctx_.header + (4 - ctx_.bytes_needed), data + processed, to_copy);
processed += to_copy;
ctx_.bytes_needed -= to_copy;
if (ctx_.bytes_needed == 0) {
// 检查是否匹配"OggS"
if (memcmp(ctx_.header, "OggS", 4) == 0) {
state_ = ParseState::PARSE_HEADER;
ctx_.data_offset = 4;
ctx_.bytes_needed = 27 - 4; // 还需要23字节完成页头
} else {
// 匹配失败，滑动1字节继续匹配
memmove(ctx_.header, ctx_.header + 1, 3);
ctx_.bytes_needed = 1;
}
} else {
// 数据不足，等待更多数据
return processed;
}
} else if (ctx_.bytes_needed == 4) {
// 在数据块中查找完整的"OggS"
bool found = false;
size_t i = 0;
size_t remaining = size - processed;
// 搜索"OggS"
for (; i + 4 <= remaining; i++) {
if (memcmp(data + processed + i, "OggS", 4) == 0) {
found = true;
break;
}
}
if (found) {
// 找到"OggS"，跳过已搜索的字节
processed += i;
// 不记录找到的"OggS"，无必要
// memcpy(ctx_.header, data + processed, 4);
processed += 4;
state_ = ParseState::PARSE_HEADER;
ctx_.data_offset = 4;
ctx_.bytes_needed = 27 - 4; // 还需要23字节
} else {
// 没有找到完整"OggS"，保存可能的部分匹配
size_t partial_len = remaining - i;
if (partial_len > 0) {
memcpy(ctx_.header, data + processed + i, partial_len);
ctx_.bytes_needed = 4 - partial_len;
processed += i + partial_len;
} else {
processed += i; // 已搜索所有字节
}
return processed; // 返回已处理的字节数
}
} else {
ESP_LOGE(TAG, "OggDemuxer run in error state: bytes_needed=%zu", ctx_.bytes_needed);
Reset();
return processed;
}
break;
}
case ParseState::PARSE_HEADER: {
size_t available = size - processed;
if (available < ctx_.bytes_needed) {
// 数据不足，复制可用的部分
memcpy(ctx_.header + ctx_.data_offset,
data + processed, available);
ctx_.data_offset += available;
ctx_.bytes_needed -= available;
processed += available;
return processed; // 等待更多数据
} else {
// 有足够的数据完成页头
size_t to_copy = ctx_.bytes_needed;
memcpy(ctx_.header + ctx_.data_offset,
data + processed, to_copy);
processed += to_copy;
ctx_.data_offset += to_copy;
ctx_.bytes_needed = 0;
// 验证页头
if (ctx_.header[4] != 0) {
ESP_LOGE(TAG, "无效的Ogg版本: %d", ctx_.header[4]);
state_ = ParseState::FIND_PAGE;
ctx_.bytes_needed = 4;
ctx_.data_offset = 0;
break;
}
ctx_.seg_count = ctx_.header[26];
if (ctx_.seg_count > 0 && ctx_.seg_count <= 255) {
state_ = ParseState::PARSE_SEGMENTS;
ctx_.bytes_needed = ctx_.seg_count;
ctx_.data_offset = 0;
} else if (ctx_.seg_count == 0) {
// 没有段，直接跳到下一个页面
state_ = ParseState::FIND_PAGE;
ctx_.bytes_needed = 4;
ctx_.data_offset = 0;
} else {
ESP_LOGE(TAG, "无效的段数: %u", ctx_.seg_count);
state_ = ParseState::FIND_PAGE;
ctx_.bytes_needed = 4;
ctx_.data_offset = 0;
}
}
break;
}
case ParseState::PARSE_SEGMENTS: {
size_t available = size - processed;
if (available < ctx_.bytes_needed) {
memcpy(ctx_.seg_table + ctx_.data_offset,
data + processed, available);
ctx_.data_offset += available;
ctx_.bytes_needed -= available;
processed += available;
return processed; // 等待更多数据
} else {
size_t to_copy = ctx_.bytes_needed;
memcpy(ctx_.seg_table + ctx_.data_offset,
data + processed, to_copy);
processed += to_copy;
ctx_.data_offset += to_copy;
ctx_.bytes_needed = 0;
state_ = ParseState::PARSE_DATA;
ctx_.seg_index = 0;
ctx_.data_offset = 0;
// 计算数据体总大小
ctx_.body_size = 0;
for (size_t i = 0; i < ctx_.seg_count; ++i) {
ctx_.body_size += ctx_.seg_table[i];
}
ctx_.body_offset = 0;
ctx_.seg_remaining = 0;
}
break;
}
case ParseState::PARSE_DATA: {
while (ctx_.seg_index < ctx_.seg_count && processed < size) {
uint8_t seg_len = ctx_.seg_table[ctx_.seg_index];
// 检查段数据是否已经部分读取
if (ctx_.seg_remaining > 0) {
seg_len = ctx_.seg_remaining;
} else {
ctx_.seg_remaining = seg_len;
}
// 检查缓冲区是否足够
if (ctx_.packet_len + seg_len > sizeof(ctx_.packet_buf)) {
ESP_LOGE(TAG, "包缓冲区溢出: %zu + %u > %zu", ctx_.packet_len, seg_len, sizeof(ctx_.packet_buf));
state_ = ParseState::FIND_PAGE;
ctx_.packet_len = 0;
ctx_.packet_continued = false;
ctx_.seg_remaining = 0;
ctx_.bytes_needed = 4;
return processed;
}
// 复制数据
size_t to_copy = std::min(size - processed, (size_t)seg_len);
memcpy(ctx_.packet_buf + ctx_.packet_len, data + processed, to_copy);
processed += to_copy;
ctx_.packet_len += to_copy;
ctx_.body_offset += to_copy;
ctx_.seg_remaining -= to_copy;
// 检查段是否完整
if (ctx_.seg_remaining > 0) {
// 段不完整，等待更多数据
return processed;
}
// 段完整
bool seg_continued = (ctx_.seg_table[ctx_.seg_index] == 255);
if (!seg_continued) {
// 包结束
if (ctx_.packet_len) {
if (!opus_info_.head_seen) {
if (ctx_.packet_len >=8 && memcmp(ctx_.packet_buf, "OpusHead", 8) == 0) {
opus_info_.head_seen = true;
if (ctx_.packet_len >= 19) {
opus_info_.sample_rate = ctx_.packet_buf[12] |
(ctx_.packet_buf[13] << 8) |
(ctx_.packet_buf[14] << 16) |
(ctx_.packet_buf[15] << 24);
ESP_LOGD(TAG, "OpusHead found, sample_rate=%d", opus_info_.sample_rate);
}
ctx_.packet_len = 0;
ctx_.packet_continued = false;
ctx_.seg_index++;
ctx_.seg_remaining = 0;
continue;
}
}
if (!opus_info_.tags_seen) {
if (ctx_.packet_len >= 8 && memcmp(ctx_.packet_buf, "OpusTags", 8) == 0) {
opus_info_.tags_seen = true;
ESP_LOGD(TAG, "OpusTags found.");
ctx_.packet_len = 0;
ctx_.packet_continued = false;
ctx_.seg_index++;
ctx_.seg_remaining = 0;
continue;
}
}
if (opus_info_.head_seen && opus_info_.tags_seen) {
if (on_demuxer_finished_) {
on_demuxer_finished_(ctx_.packet_buf, opus_info_.sample_rate, ctx_.packet_len);
}
} else {
ESP_LOGW(TAG, "当前Ogg容器未解析到OpusHead/OpusTags，丢弃");
}
}
ctx_.packet_len = 0;
ctx_.packet_continued = false;
} else {
ctx_.packet_continued = true;
}
ctx_.seg_index++;
ctx_.seg_remaining = 0;
}
if (ctx_.seg_index == ctx_.seg_count) {
// 检查是否所有数据体都已读取
if (ctx_.body_offset < ctx_.body_size) {
ESP_LOGW(TAG, "数据体不完整: %zu/%zu",
ctx_.body_offset, ctx_.body_size);
}
// 如果包跨页，保持packet_len和packet_continued
if (!ctx_.packet_continued) {
ctx_.packet_len = 0;
}
// 进入下一页面
state_ = ParseState::FIND_PAGE;
ctx_.bytes_needed = 4;
ctx_.data_offset = 0;
}
break;
}
}
}
return processed;
}