AskaEth
33414de7c4
根因：ncm_api_song_url_auto 无账户感知，依赖调用方按会员钳顶；若账户 VIP 态未就绪/
错钳到 EXHIGH，降级链从 EXHIGH 起步，LOSSLESS(无损 SQ) 被跳过，直接掉「标准」。
修法：新增 ncm_api_song_url_auto_av[_f]（§20.3 权威形态）：fee∈{1,4} 且非 CVIP →
NCM_ERR_VIP 零请求；按 account_vip 自钳顶(NONE→EXHIGH/CVIP→HIRES/SVIP→SURROUND)；
只试账户可访问档(ncm_api_level_gate<=vip)；落在最近可用档。原 auto/auto_f 行为零回归。
逐级尝试重构为共享 level_attempt（type/url 接受+静默降档采信）。
测试(bench/degrade_sim.c)：fee门禁5例 + auto_av矩阵 vip3×desired9×avail9=243例全PASS
+ 真机复现(CVIP+Hi-Res+有SQ无HiRes→落无损SQ flac)；原90例零回归。
验证：test_ncm_core_host+qemu-mipsel 全PASS；build_core/build_ncm -Wall -Wextra 0 warning。
新 ncm md5 1064a1d686390cc159f18296ee2980ee（未部署，留主会话）。
遗留：player_manager.c 仍调 auto（不传vip/fee），应改请 auto_av(account_vip()+fee)；
真机若仍掉标准需另查旧缓存 song_<id>_hires.mp3 复用或旧二进制。
251 lines
13 KiB
C
251 lines
13 KiB
C
/* bench/degrade_sim.c — song_url_auto 全档降级链离线矩阵（§20，0 真实请求）。
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*
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* 驱动真实 core/ncm_api.c 的 ncm_api_song_url_auto_f（注入假 try_fn，按「可用下限」
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* 模型应答：level <= avail_from 才给 url）。覆盖：
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* ① desired × avail_from 全矩阵（9 档 × 9 档 + 全不可用）：命中档 = min(desired, avail_from)，
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* 请求数 = desired - 命中 + 1（逐级试，不多不少）；
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* ② desired 越界钳制（DOLBY=16 → SURROUND；负数 → STANDARD）；
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* ③ url 在但 type 未知（如 aac）→ 跳过继续降；
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* ④ type 缺失时按 url 扩展名收 flac；
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* ⑤ out_level 回填值与命中档一致（「下首恢复用户档」由调用方重传 desired 保证，
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* 链内不记忆——每次调用独立从 desired 起步）。
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*
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* 编译（宿主，ncm_app 目录下，先跑过 build_core.sh 产出 out/core-host/ 全部对象）：
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* gcc -O2 -Wall -Wextra -DJSMN_HEADER -Icore -Ivendor/jsmn \
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* bench/degrade_sim.c out/core-host/全部.o \
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* -Lout/mbedtls/host -lmbedtls -lmbedx509 -lmbedcrypto -o degrade_sim -lpthread -lm
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* 运行：./degrade_sim （PASS/FAIL 退出码）
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*/
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#include "ncm.h"
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#include <stdio.h>
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#include <string.h>
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static int g_fail = 0;
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#define CHECK(cond, fmt, ...) do { \
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if (cond) printf(" PASS " fmt "\n", ##__VA_ARGS__); \
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else { printf(" FAIL " fmt "\n", ##__VA_ARGS__); g_fail = 1; } \
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} while (0)
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/* ---- 假逐档取址：level <= g_avail_from 给 url（type 可配），记录每档请求次数 ---- */
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static int g_avail_from; /* 可用下限；-1=全档不可用 */
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static const char *g_type = "mp3"; /* 应答 type（""=缺省看扩展名） */
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static const char *g_resp_level = NULL; /* 非 NULL：响应 data[0].level 固定串（服务端静默降档模拟） */
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static int g_calls[NCM_LEVEL_SURROUND + 1];
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static int fake_try(const char *dev, const char *ck, const char *id, int level,
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ncm_play_url_t *out)
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{
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(void)dev; (void)ck; (void)id;
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if (level >= 0 && level <= NCM_LEVEL_SURROUND) g_calls[level]++;
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memset(out, 0, sizeof *out);
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if (level > g_avail_from) return NCM_OK; /* 该档不可用：url 空 */
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snprintf(out->url, sizeof out->url, "http://sim/%lld.%s", (long long)12345,
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(level >= NCM_LEVEL_LOSSLESS) ? "flac" : "mp3");
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snprintf(out->type, sizeof out->type, "%s", g_type);
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if (g_resp_level) snprintf(out->level, sizeof out->level, "%s", g_resp_level);
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out->br = 320000;
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out->size = 9000000;
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return NCM_OK;
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}
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static int g_bad_type_from = -1; /* >=0: 该档以上给 aac（未知格式应跳过） */
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static int fake_try_badtype(const char *dev, const char *ck, const char *id, int level,
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ncm_play_url_t *out)
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{
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int r = fake_try(dev, ck, id, level, out);
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if (r == NCM_OK && out->url[0] && level >= g_bad_type_from)
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snprintf(out->type, sizeof out->type, "aac");
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return r;
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}
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static void reset_calls(void) { memset(g_calls, 0, sizeof g_calls); }
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static int total_calls(void)
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{
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int n = 0;
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for (int i = 0; i <= NCM_LEVEL_SURROUND; i++) n += g_calls[i];
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return n;
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}
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/* ---- §20.3 账户/fee 感知降级链（auto_av_f）期望模型 ----
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* cap(vip)：NONE→EXHIGH / CVIP→HIRES / SVIP→SURROUND（与 account.c account_level_cap 同口径）。
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* start = clamp(desired, STANDARD, cap)；只试 gate(lv)<=vip 的档；落在 lv<=avail 的最近可用档。 */
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static int cap_for_vip(int vip) {
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switch (vip) {
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case NCM_VIP_SVIP: return NCM_LEVEL_SURROUND;
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case NCM_VIP_CVIP: return NCM_LEVEL_HIRES;
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default: return NCM_LEVEL_EXHIGH;
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}
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}
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static int expect_land(int vip, int desired, int avail) {
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int cap = cap_for_vip(vip);
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int start = desired > cap ? cap : desired;
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if (start < NCM_LEVEL_STANDARD) start = NCM_LEVEL_STANDARD;
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for (int lv = start; lv >= NCM_LEVEL_STANDARD; lv--)
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if (ncm_api_level_gate(lv) <= vip && lv <= avail) return lv;
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return -1;
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}
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static int expect_tried(int vip, int desired, int best) {
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int cap = cap_for_vip(vip);
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int start = desired > cap ? cap : desired;
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if (start < NCM_LEVEL_STANDARD) start = NCM_LEVEL_STANDARD;
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int n = 0;
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for (int lv = start; lv >= NCM_LEVEL_STANDARD; lv--)
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if (ncm_api_level_gate(lv) <= vip && (best < 0 || lv >= best)) n++;
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return n;
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}
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int main(void)
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{
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ncm_play_url_t u;
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int eff;
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printf("== 1) desired × avail_from 全矩阵 ==\n");
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int cases = 0, bad = 0;
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for (int desired = NCM_LEVEL_STANDARD; desired <= NCM_LEVEL_SURROUND; desired++) {
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for (int avail = NCM_LEVEL_STANDARD; avail <= NCM_LEVEL_SURROUND; avail++) {
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reset_calls();
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g_avail_from = avail; g_type = "mp3";
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int rc = ncm_api_song_url_auto_f("dev", "ck", "1", desired, &u, &eff, fake_try);
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int want = (avail < desired) ? avail : desired; /* 期望命中 = min */
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int ok = (rc == NCM_OK) && (eff == want) && u.url[0] &&
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(total_calls() == desired - want + 1);
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/* 高档（>命中）各恰好 1 次，低档不请求 */
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for (int lv = want + 1; lv <= desired; lv++) ok = ok && (g_calls[lv] == 1);
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for (int lv = 0; lv < want; lv++) ok = ok && (g_calls[lv] == 0);
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cases++;
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if (!ok) {
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bad++;
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printf(" FAIL desired=%d(%s) avail=%d -> rc=%d eff=%d calls=%d (want %d/%d)\n",
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desired, ncm_api_level_str(desired), avail, rc, eff, total_calls(),
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want, desired - want + 1);
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g_fail = 1;
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}
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}
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/* 全不可用 → NOTFOUND，且恰好 desired+1 次请求 */
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reset_calls();
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g_avail_from = -1; g_type = "mp3";
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int rc = ncm_api_song_url_auto_f("dev", "ck", "1", desired, &u, &eff, fake_try);
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int ok = (rc == NCM_ERR_NOTFOUND) && (eff == -1) &&
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(total_calls() == desired - NCM_LEVEL_STANDARD + 1);
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cases++;
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if (!ok) {
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bad++;
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printf(" FAIL desired=%d all-unavail -> rc=%d eff=%d calls=%d\n",
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desired, rc, eff, total_calls());
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g_fail = 1;
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}
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}
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CHECK(bad == 0, "matrix %d cases all pass (desired 9 x avail 9 + 全不可用 9)", cases);
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printf("== 2) desired 越界钳制 ==\n");
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reset_calls();
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g_avail_from = NCM_LEVEL_SURROUND; g_type = "mp3";
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CHECK(ncm_api_song_url_auto_f("d", "c", "1", NCM_LEVEL_DOLBY, &u, &eff, fake_try) == NCM_OK &&
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eff == NCM_LEVEL_SURROUND && total_calls() == 1 && g_calls[NCM_LEVEL_SURROUND] == 1,
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"desired=DOLBY(16) clamped to SURROUND (eff=%d calls=%d)", eff, total_calls());
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reset_calls();
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CHECK(ncm_api_song_url_auto_f("d", "c", "1", -7, &u, &eff, fake_try) == NCM_OK &&
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eff == NCM_LEVEL_STANDARD && total_calls() == 1,
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"desired=-7 clamped to STANDARD (eff=%d)", eff);
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printf("== 3) 未知 type 跳过继续降 ==\n");
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reset_calls();
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g_avail_from = NCM_LEVEL_SURROUND; g_bad_type_from = NCM_LEVEL_HIRES;
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/* hires 及以上 url 在但 type=aac → 跳过，落在 lossless */
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CHECK(ncm_api_song_url_auto_f("d", "c", "1", NCM_LEVEL_SKY, &u, &eff, fake_try_badtype)
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== NCM_OK && eff == NCM_LEVEL_LOSSLESS,
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"aac above hires -> land lossless (eff=%d)", eff);
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printf("== 4) type 缺失按 url 扩展名收 flac ==\n");
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reset_calls();
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g_avail_from = NCM_LEVEL_LOSSLESS; g_type = "";
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CHECK(ncm_api_song_url_auto_f("d", "c", "1", NCM_LEVEL_LOSSLESS, &u, &eff, fake_try)
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== NCM_OK && strcmp(u.type, "flac") == 0,
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"type empty + .flac url -> type backfilled flac");
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printf("== 5) out_level 每次独立（下首恢复用户档语义） ==\n");
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reset_calls();
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g_avail_from = NCM_LEVEL_STANDARD; g_type = "mp3";
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ncm_api_song_url_auto_f("d", "c", "1", NCM_LEVEL_SURROUND, &u, &eff, fake_try);
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int first_eff = eff;
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reset_calls();
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g_avail_from = NCM_LEVEL_SURROUND;
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ncm_api_song_url_auto_f("d", "c", "2", NCM_LEVEL_SURROUND, &u, &eff, fake_try);
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CHECK(first_eff == NCM_LEVEL_STANDARD && eff == NCM_LEVEL_SURROUND,
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"prev degraded to standard, next song back at surround (eff %d -> %d)",
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first_eff, eff);
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printf("== 6) 响应 level 静默降档采信（data[0].level < 请求档） ==\n");
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reset_calls();
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g_avail_from = NCM_LEVEL_SURROUND; g_type = "flac"; g_resp_level = "exhigh";
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CHECK(ncm_api_song_url_auto_f("d", "c", "1", NCM_LEVEL_HIRES, &u, &eff, fake_try) == NCM_OK &&
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eff == NCM_LEVEL_EXHIGH,
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"req hires, resp level=exhigh -> eff=exhigh (got %d)", eff);
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reset_calls();
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g_resp_level = "sky"; /* sky 族有歧义：不采信，保守取请求档 */
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CHECK(ncm_api_song_url_auto_f("d", "c", "1", NCM_LEVEL_SURROUND, &u, &eff, fake_try) == NCM_OK &&
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eff == NCM_LEVEL_SURROUND,
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"req surround, resp level=sky (歧义) -> eff=surround (got %d)", eff);
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g_resp_level = NULL;
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printf("== 7) auto_av_f fee 门禁（§20.4：fee∈{1,4} 且非 CVIP → 零请求 NCM_ERR_VIP）==\n");
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reset_calls(); g_avail_from = NCM_LEVEL_SURROUND; g_type = "mp3";
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CHECK(ncm_api_song_url_auto_av_f("d", "c", "1", NCM_VIP_NONE, 1, NCM_LEVEL_HIRES, &u, &eff, fake_try)
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== NCM_ERR_VIP && total_calls() == 0,
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"fee=1 + NONE -> NCM_ERR_VIP (calls=%d)", total_calls());
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CHECK(ncm_api_song_url_auto_av_f("d", "c", "1", NCM_VIP_NONE, 4, NCM_LEVEL_HIRES, &u, &eff, fake_try)
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== NCM_ERR_VIP && total_calls() == 0,
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"fee=4 + NONE -> NCM_ERR_VIP (calls=%d)", total_calls());
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CHECK(ncm_api_song_url_auto_av_f("d", "c", "1", NCM_VIP_CVIP, 1, NCM_LEVEL_HIRES, &u, &eff, fake_try)
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== NCM_OK, "fee=1 + CVIP -> 放行");
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CHECK(ncm_api_song_url_auto_av_f("d", "c", "1", NCM_VIP_NONE, 8, NCM_LEVEL_HIRES, &u, &eff, fake_try)
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== NCM_OK, "fee=8 + NONE -> 放行（免费听低音质）");
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CHECK(ncm_api_song_url_auto_av_f("d", "c", "1", NCM_VIP_NONE, 0, NCM_LEVEL_HIRES, &u, &eff, fake_try)
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== NCM_OK, "fee=0 + NONE -> 放行");
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printf("== 8) auto_av_f 全矩阵: account_vip 3 x desired 9 x avail 9（钳顶+门槛+最近可用档）==\n");
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int av_bad = 0, av_cases = 0;
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for (int vip = NCM_VIP_NONE; vip <= NCM_VIP_SVIP; vip++) {
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for (int desired = NCM_LEVEL_STANDARD; desired <= NCM_LEVEL_SURROUND; desired++) {
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for (int avail = NCM_LEVEL_STANDARD; avail <= NCM_LEVEL_SURROUND; avail++) {
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reset_calls();
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g_avail_from = avail; g_type = "mp3";
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int rc = ncm_api_song_url_auto_av_f("dev", "ck", "1", vip, 0, desired, &u, &eff, fake_try);
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int want = expect_land(vip, desired, avail);
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int ok = (want >= 0 && rc == NCM_OK && eff == want && u.url[0] &&
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total_calls() == expect_tried(vip, desired, want));
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av_cases++;
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if (!ok) {
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av_bad++;
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printf(" FAIL vip=%d desired=%d(%s) avail=%d -> rc=%d eff=%d calls=%d (want %d/%d)\n",
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vip, desired, ncm_api_level_str(desired), avail, rc, eff, total_calls(),
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want, expect_tried(vip, desired, want));
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g_fail = 1;
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}
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}
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}
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}
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CHECK(av_bad == 0, "auto_av matrix %d cases all pass (vip 3 x desired 9 x avail 9)", av_cases);
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printf("== 9) 真机场景复现：CVIP + 设置Hi-Res + 歌曲「有SQ无Hi-Res」→ 落无损SQ ==\n");
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reset_calls();
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g_avail_from = NCM_LEVEL_LOSSLESS; /* 歌曲只提供到 SQ（及更低）→ 无 Hi-Res */
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g_type = "flac"; /* SQ 以 flac 下发 */
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int rc9 = ncm_api_song_url_auto_av_f("d", "c", "10", NCM_VIP_CVIP, 0, NCM_LEVEL_HIRES,
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&u, &eff, fake_try);
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CHECK(rc9 == NCM_OK && eff == NCM_LEVEL_LOSSLESS && strcmp(u.type, "flac") == 0,
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"CVIP Hi-Res、有SQ无HiRes -> 落无损SQ (rc=%d eff=%d(%s) type=%s)",
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rc9, eff, ncm_api_level_str(eff), u.type);
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/* 对照：若账户VIP态未就绪(NONE)，钳顶把Hi-Res压到极高，SQ被跳过（旧app clamp即此路径） */
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reset_calls();
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g_avail_from = NCM_LEVEL_LOSSLESS; g_type = "flac";
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int rcn = ncm_api_song_url_auto_av_f("d", "c", "10", NCM_VIP_NONE, 0, NCM_LEVEL_HIRES,
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&u, &eff, fake_try);
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CHECK(rcn == NCM_OK && eff == NCM_LEVEL_EXHIGH,
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"NONE+Hi-Res -> 钳到极高EXHIGH (rc=%d eff=%d) — 旧app clamp正是此路径致SQ被跳过",
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rcn, eff);
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printf(g_fail ? "== DEGRADE SIM: FAIL ==\n" : "== DEGRADE SIM: ALL PASS ==\n");
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return g_fail;
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}
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