ChapterInfo from Audible Api incorrect

[Mbucari]

I was just running some books through Libation (splitting by chapter), and I noticed that very few of the chapters files were being created. I thought I broke something with my PR, but it looks like Audible is returning incorrect chapter info from the catalog endpoint.

Check out ASINs: "1774246171" and "B002V19RO6"

[Mbucari]

OK, I dug a little deeper and discovered that Audible must have recently changed their chapter format. Previously, "chapter_info" contained a "chapters" array . Now, each "chapters" can also contain a "chapters" (useful I suppose for hierarchical chapter structures).

Here's the json from B002V19RO6. We need to fix AudibleApi.Common.

      "chapter_info": {
        "brandIntroDurationMs": 1904,
        "brandOutroDurationMs": 4969,
        "chapters": [
          {
            "length_ms": 9965,
            "start_offset_ms": 0,
            "start_offset_sec": 0,
            "title": "Opening Credits"
          },
          {
            "chapters": [
              {
                "length_ms": 2432004,
                "start_offset_ms": 12965,
                "start_offset_sec": 13,
                "title": "I"
              },
              {
                "length_ms": 1157421,
                "start_offset_ms": 2444969,
                "start_offset_sec": 2445,
                "title": "II"
              },
              {
                "length_ms": 1100161,
                "start_offset_ms": 3602390,
                "start_offset_sec": 3602,
                "title": "III"
              },
              {
                "length_ms": 1367377,
                "start_offset_ms": 4702551,
                "start_offset_sec": 4703,
                "title": "IV"
              },
              {
                "length_ms": 1908030,
                "start_offset_ms": 6069928,
                "start_offset_sec": 6070,
                "title": "V"
              },
              {
                "length_ms": 771088,
                "start_offset_ms": 7977958,
                "start_offset_sec": 7978,
                "title": "VI"
              },
              {
                "length_ms": 1620567,
                "start_offset_ms": 8749046,
                "start_offset_sec": 8749,
                "title": "VII"
              },
              {
                "length_ms": 2904816,
                "start_offset_ms": 10369613,
                "start_offset_sec": 10370,
                "title": "VIII"
              }
            ],
            "length_ms": 3000,
            "start_offset_ms": 9965,
            "start_offset_sec": 10,
            "title": "One"
          },
          {
            "chapters": [
              {
                "length_ms": 1587195,
                "start_offset_ms": 13277429,
                "start_offset_sec": 13277,
                "title": "I"
              },
              {
                "length_ms": 1303986,
                "start_offset_ms": 14864624,
                "start_offset_sec": 14865,
                "title": "II"
              },
              {
                "length_ms": 1254713,
                "start_offset_ms": 16168610,
                "start_offset_sec": 16169,
                "title": "III"
              },
              {
                "length_ms": 1306773,
                "start_offset_ms": 17423323,
                "start_offset_sec": 17423,
                "title": "IV"
              },
              {
                "length_ms": 1176787,
                "start_offset_ms": 18730096,
                "start_offset_sec": 18730,
                "title": "V"
              },
              {
                "length_ms": 374631,
                "start_offset_ms": 19906883,
                "start_offset_sec": 19907,
                "title": "VI"
              },
              {
                "length_ms": 1000362,
                "start_offset_ms": 20281514,
                "start_offset_sec": 20282,
                "title": "VII"
              },
              {
                "length_ms": 1536697,
                "start_offset_ms": 21281876,
                "start_offset_sec": 21282,
                "title": "VIII"
              },
              {
                "length_ms": 5398779,
                "start_offset_ms": 22818573,
                "start_offset_sec": 22819,
                "title": "IX"
              },
              {
                "length_ms": 899309,
                "start_offset_ms": 28217352,
                "start_offset_sec": 28217,
                "title": "X"
              }
            ],
            "length_ms": 3000,
            "start_offset_ms": 13274429,
            "start_offset_sec": 13274,
            "title": "Two"
          },
          {
            "chapters": [
              {
                "length_ms": 1857011,
                "start_offset_ms": 29119661,
                "start_offset_sec": 29120,
                "title": "I"
              },
              {
                "length_ms": 2921117,
                "start_offset_ms": 30976672,
                "start_offset_sec": 30977,
                "title": "II"
              },
              {
                "length_ms": 1932504,
                "start_offset_ms": 33897789,
                "start_offset_sec": 33898,
                "title": "III"
              },
              {
                "length_ms": 1146183,
                "start_offset_ms": 35830293,
                "start_offset_sec": 35830,
                "title": "IV"
              },
              {
                "length_ms": 628611,
                "start_offset_ms": 36976476,
                "start_offset_sec": 36976,
                "title": "V"
              },
              {
                "length_ms": 1522532,
                "start_offset_ms": 37605087,
                "start_offset_sec": 37605,
                "title": "VI"
              }
            ],
            "length_ms": 3000,
            "start_offset_ms": 29116661,
            "start_offset_sec": 29117,
            "title": "Three"
          },
          {
            "length_ms": 1851188,
            "start_offset_ms": 39127619,
            "start_offset_sec": 39128,
            "title": "The Principles of Newspeak"
          }
        ],
        "is_accurate": true,
        "runtime_length_ms": 40978807,
        "runtime_length_sec": 40979
      }

[Mbucari]

rmcrackan/AudibleApi#30
https://github.com/rmcrackan/Libation/pull/280/files

[rmcrackan]

Thanks -- fixed by you in version 8.1

[Mbucari]

@mkb79

Did you know about this change?

[rmcrackan]

@Mbucari , @mkb79 -- I love that we keep each other up to date on this stuff. Years ago there was a guy (Omar Roth) who made an audible api in a language called crystal. It was one of the first I ever found and when he was active he was super friendly. it's a great legacy that I'm glad persists.

[mkb79]

@Mbucari
Months ago, a user reported on GitHub (I think in the Openaudible repo) that he has an audiobook with such subchapters. He asked if they could be implemented. I didn't pay attention to this myself, because I don't have such audiobooks!

@rmcrackan
Yeah Omar Roth's package is well known by me. He was the one who inspired me to write my Audible package. Or rather, I ported his package to Python. I've used his good documentation and API endpoints description in my docs.

@rmcrackan @Mbucari
I am currently working on a Goodreads API. I found out how to use the API independently of a developer API key.

[Mbucari]

because I don't have such audiobooks

Both of those ASINs I listed are audible plus titles, so you can test them. As recently as last week I downloaded the same audiobooks through libation, and at that time they did not have sub chapters. It seems audible may be going through their catalog and updating metadata.

[mkb79]

@Mbucari
Audible Plus is not available in Germany!