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mp3read.ml
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mp3read.ml
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(*******************************************************************************
This file is a part of mp3packer.
mp3packer is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
mp3packer is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with mp3packer; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*******************************************************************************)
open Types;;
open Pack;;
let header_of_ptrref_2 (p : p_type list -> unit) r =
if Ptr.Ref.length r < 4 then None else (
try
let b = Ptr.Ref.get_bits r in
if b 0 11 <> 0x7FF then (p [Str " SYNC'S WRONG"]; raise Not_found);
let id_index = b 11 2 in
let MPEG_ext id = match id_index with
| 0 -> MPEG_ext (MPEG2 MPEG25)
| 2 -> MPEG_ext (MPEG2 MPEG20)
| 3 -> MPEG_ext MPEG1
| _ -> (p [Str " ID'S WRONG"]; raise Not_found);
in
if b 13 2 <> 1 then (p [Str " LAYER'S NOT 3"]; raise Not_found);
let crc = (b 15 1 = 0) in
let samplerate_index = b 20 2 in
if samplerate_index = 3 then (p [Str " INVALID SAMPLERATE"]; raise Not_found);
let samplerate = (samplerate_array_of_id id).(samplerate_index) in
let channel_index = b 24 2 in
let ms = (b 26 1 = 1) in
let is = (b 27 1 = 1) in
let Channel_ext channels = match channel_index with
| 0 -> Channel_ext (Stereo Stereo_simple)
| 1 -> Channel_ext (Stereo (Stereo_joint {js_ms = ms; js_is = is}))
| 2 -> Channel_ext (Stereo Stereo_dual)
| 3 -> Channel_ext Mono
| _ -> assert false
in
let padding = (b 22 1 = 1) in
let bitrate_index = b 16 4 in
if bitrate_index = 0 || bitrate_index = 15 then (p [Str " INVALID BITRATE"]; raise Not_found);
let bitrate = bitrate_of_samplerate_and_index samplerate channels bitrate_index padding in
let priv = (b 23 1 = 1) in
let copyright = (b 28 1 = 1) in
let original = (b 29 1 = 1) in
let emphasis = match b 30 2 with
| 0 -> Emphasis_none
| 1 -> Emphasis_5015
| 2 -> (p [Str " INVALID EMPHASIS"]; raise Not_found)
| 3 -> Emphasis_CCITT
| _ -> assert false
in
let header = {
header_raw = r;
header_id = id;
header_crc = crc;
header_bitrate = bitrate;
header_samplerate = samplerate;
header_padding = padding;
header_private = priv;
header_channel_mode = channels;
header_copyright = copyright;
header_original = original;
header_emphasis = emphasis;
} in
Some (Header_ext header)
with
| Not_found -> None
)
;;
let side_info_of_header_2 : type id chan. (id,chan) header_t -> Ptr.Ref.ref_t -> (id,chan) side_t =
function
| {header_id = MPEG1; header_channel_mode = Mono} -> (fun side_raw ->
let b = Ptr.Ref.get_bits side_raw in
let off = b 0 9 in
let g1 = b 18 12 in
let g2 = b 77 12 in
{
side_raw = side_raw;
side_offset = off;
side_bits = Bits_1_mono (g1,g2);
side_bytes = (g1 + g2 + 7) asr 3;
}
)
| {header_id = MPEG1; header_channel_mode = Stereo _} -> (fun side_raw ->
let b = Ptr.Ref.get_bits side_raw in
let off = b 0 9 in
let g1 = b 20 12 in
let g2 = b 79 12 in
let g3 = b 138 12 in
let g4 = b 197 12 in
{
side_raw = side_raw;
side_offset = off;
side_bits = Bits_1_stereo (g1,g2,g3,g4);
side_bytes = (g1 + g2 + g3 + g4 + 7) asr 3;
}
)
| {header_id = MPEG2 _; header_channel_mode = Mono} -> (fun side_raw ->
let b = Ptr.Ref.get_bits side_raw in
let off = b 0 8 in
let g1 = b 9 12 in
{
side_raw = side_raw;
side_offset = off;
side_bits = Bits_2_mono (g1);
side_bytes = (g1 + 7) asr 3;
}
)
| {header_id = MPEG2 _; header_channel_mode = Stereo _} -> (fun side_raw ->
let b = Ptr.Ref.get_bits side_raw in
let off = b 0 8 in
let g1 = b 10 12 in
let g2 = b 73 12 in
{
side_raw = side_raw;
side_offset = off;
side_bits = Bits_2_stereo (g1,g2);
side_bytes = (g1 + g2 + 7) asr 3;
}
)
;;
(* This function has to be here in order to take advantage of both mp3types and pack *)
let side_info_of_if_2 f = side_info_of_header_2 f.if_header f.if_side_raw;;
let get_current_crc_2 header side_raw =
if header.header_crc then (
let validate_this = Ptr.Ref.append (Ptr.Ref.sub header.header_raw 2 2) side_raw in
Crc.mp3_create_ptrref validate_this 0xFFFF
) else (
(* Always invalid *)
-1
)
;;
class virtual virt_mp3read_2 =
object(o)
method private virtual p : p_type list -> unit
val mutable frame_number = 0
val mutable first_frame_start = max_int
val mutable last_frame_end = 0
method first_mp3_byte = first_frame_start
method last_mp3_byte = last_frame_end
method virtual seek : int -> unit
method virtual pos : int
method virtual length : int
method virtual read : string -> int -> int -> unit
method virtual read_ptrref : int -> Ptr.Ref.ref_t
method virtual close : unit
method header_of_ptrref = header_of_ptrref_2 o#p
method get_header_here = (
(try
match o#header_of_ptrref (o#read_ptrref header_bytes) with
| None -> Ret_none
| Some x -> Ret_some x
with
| End_of_file -> (o#p [Str "Got EOF reading frame header"]; Ret_eof)
)
)
method match_reqs : type id chan. (id,chan) header_t -> reqs_t -> bool = fun header reqs -> (
let stringify_list str_fun l f = List.iter (fun x -> f (Str " "); f (Str (str_fun x))) l in
let handle_error p_name p_val p_stringify x =
o#p [Spaces 1; Str p_name; Spaces 1; p_val; Str " is not in ["; Fun (stringify_list p_stringify x); Str " ]"];
false
in
match reqs with
| {req_id = Req_matches x} when not (List.mem (MPEG_ext header.header_id) x) -> handle_error "ID" (Str (string_of_mpeg header.header_id)) string_of_mpeg_ext x
| {req_crc = Req_matches x} when not (List.mem header.header_crc x) -> handle_error "CRC" (Bool header.header_crc ) string_of_bool x
| {req_bitrate = Req_matches x} when not (List.mem header.header_bitrate.bitrate_num x) -> handle_error "Bitrate" (Int header.header_bitrate.bitrate_num) string_of_int x
| {req_samplerate = Req_matches x} when not (List.mem (Samplerate_ext header.header_samplerate) x) -> handle_error "Samplerate" (Int (int_of_samplerate header.header_samplerate)) string_of_samplerate_ext x
| {req_padding = Req_matches x} when not (List.mem header.header_bitrate.bitrate_padding x) -> handle_error "Padding" (Bool header.header_bitrate.bitrate_padding) string_of_bool x
| {req_private = Req_matches x} when not (List.mem header.header_private x) -> handle_error "Private" (Bool header.header_private ) string_of_bool x
| {req_channel_mode = Req_matches x} when not (List.mem (Channel_ext header.header_channel_mode) x) -> handle_error "Channel mode" (Str (string_of_channel header.header_channel_mode)) string_of_channel_ext x
| {req_channel_count = Req_matches x} when not (List.mem (count_of_channel header.header_channel_mode) x) -> handle_error "Channel count" (Int (count_of_channel header.header_channel_mode)) string_of_int x
| {req_copyright = Req_matches x} when not (List.mem header.header_copyright x) -> handle_error "Copyright" (Bool header.header_copyright ) string_of_bool x
| {req_original = Req_matches x} when not (List.mem header.header_original x) -> handle_error "Original" (Bool header.header_original ) string_of_bool x
| {req_emphasis = Req_matches x} when not (List.mem header.header_emphasis x) -> handle_error "Emphasis" (Str (string_of_emphasis header.header_emphasis)) string_of_emphasis x
| _ -> true
)
method update_reqs : type id chan. (id,chan) header_t -> reqs_t -> reqs_t = fun h reqs -> (
let equal_to_matches matches_list = function
| Req_equal -> Req_matches matches_list
| Req_any -> Req_any
| Req_matches x -> Req_matches x
in
{
req_id = equal_to_matches [MPEG_ext h.header_id ] reqs.req_id;
req_crc = equal_to_matches [h.header_crc ] reqs.req_crc;
req_bitrate = equal_to_matches [h.header_bitrate.bitrate_num ] reqs.req_bitrate;
req_samplerate = equal_to_matches [Samplerate_ext h.header_samplerate ] reqs.req_samplerate;
req_padding = equal_to_matches [h.header_bitrate.bitrate_padding ] reqs.req_padding;
req_private = equal_to_matches [h.header_private ] reqs.req_private;
req_channel_mode = equal_to_matches [Channel_ext h.header_channel_mode ] reqs.req_channel_mode;
req_channel_count = equal_to_matches [count_of_channel h.header_channel_mode] reqs.req_channel_count;
req_copyright = equal_to_matches [h.header_copyright ] reqs.req_copyright;
req_original = equal_to_matches [h.header_original ] reqs.req_original;
req_emphasis = equal_to_matches [h.header_emphasis ] reqs.req_emphasis;
}
)
method get_frame_here reqs = (
let start_pos = o#pos in
o#p [Str "get_frame_here at "; Int start_pos];
try
match o#get_header_here with
| Ret_none -> (
o#p [Str " SYNC ERROR AT "; Int (o#pos - header_bytes)];
Ret_none
)
| Ret_some (Header_ext header) -> (
if o#match_reqs header reqs then (
(* Match succeeded *)
let total_frame_bytes = header.header_bitrate.bitrate_size in
let side_info_bytes = side_bytes_of_header header in
let side_off = header_bytes + (if header.header_crc then 2 else 0) in
let raw_data_off = side_off + side_info_bytes in
let after_header = o#read_ptrref (total_frame_bytes - header_bytes) in
let frame = Ptr.Ref.append header.header_raw after_header in
o#p [Str "Frame ptr ref:"];
o#p [Str " "; Ptrref frame];
let side_raw = Ptr.Ref.sub frame side_off side_info_bytes in
let crc_ok = if header.header_crc then (
let target_crc = Ptr.Ref.get_bits frame 32 16 in
let actual_crc = get_current_crc_2 header side_raw in
o#p [Str " Frame CRCs: written is "; Hex (4, target_crc); Str ", real is "; Hex (4, actual_crc)];
target_crc = actual_crc
) else (
true
) in
if not crc_ok then o#p [Str " FRAME CRC IS INVALID"];
o#p [Str " Found requested frame from "; Int start_pos; Str " to "; Int o#pos];
Ret_some (IF_ext {
if_raw = frame;
if_header = header;
if_side_raw = side_raw;
if_data_raw = Ptr.Ref.sub frame raw_data_off (total_frame_bytes - raw_data_off);
if_crc_ok = crc_ok;
if_xing = None;
})
) else (
o#seek start_pos;
Ret_none
)
)
| Ret_eof -> Ret_eof
with
| End_of_file -> (o#p [Str " HIT THE EOF"]; o#seek start_pos; Ret_none)
)
method resync_here num_frames reqs = (
let start_pos = o#pos in
o#p [Str "resync_here at "; Int start_pos];
let rec find_frame_and_update_reqs more_frames reqs_now =
match o#get_frame_here reqs_now with
| Ret_some (IF_ext frame) -> (
let new_pos = o#pos in
let new_reqs = o#update_reqs frame.if_header reqs_now in
if more_frames > 1 then (
match find_frame_and_update_reqs (pred more_frames) new_reqs with
| None -> (o#seek start_pos; None)
| Some (next_reqs, _) -> (o#seek new_pos; Some (next_reqs, IF_ext frame))
) else (
(* Return this frame *)
Some (new_reqs, IF_ext frame)
)
)
| Ret_eof | Ret_none -> (o#seek start_pos; None)
in
let rec find_sync_rec inky =
o#seek (start_pos + inky);
match find_frame_and_update_reqs num_frames reqs with
| None -> (
if start_pos + inky + header_bytes >= o#length then (
None
) else (
find_sync_rec (succ inky)
)
)
| Some (r,f) -> Some (r, f, inky)
in
match find_sync_rec 0 with
| Some (r, f, inky) -> (
if inky = 0 then (
o#p [Str "Found "; Int num_frames; Str " frames starting from "; Int start_pos]
) else (
o#p [Str "Found "; Int num_frames; Str " frames starting from "; Int (start_pos + inky); Str " (resync needed from "; Int start_pos; Str ")"]
);
Some (r, f, (start_pos, start_pos + inky))
)
| None -> None
)
method lame_of_ptrref frame_ptrref lame_start_off (*lame_part*) = (
(* Returns None if the CRC didn't check out, or if it's the wrong length *)
let lame_bytes = 36 in
let lame_part = Ptr.Ref.sub frame_ptrref lame_start_off lame_bytes in
if Ptr.Ref.length lame_part <> lame_bytes then (
None
) else (
let rec count_zeros frame_raw now num =
if now >= Ptr.Ref.length frame_raw || Ptr.Ref.ref_get_byte frame_raw now <> 0 then (
num
) else (
count_zeros frame_raw (succ now) (succ num)
)
in
let crc_ok =
if count_zeros lame_part 20 0 >= 1 && count_zeros lame_part 24 0 >= 12 && count_zeros lame_part 21 0 < 3 then (
(* Consider this situation to always have the correct CRC *)
o#p [Str " XING search found LAME frame with only offset info"];
true
) else (
let tag_crc = Ptr.Ref.get_bits lame_part (8 * (lame_bytes - 2)) 16 in
let real_crc = Crc.lame_create_ptrref (Ptr.Ref.sub frame_ptrref 0 (lame_start_off + lame_bytes - 2)) 0 in
o#p [Str " Written CRC is "; Hex (4, tag_crc); Str ", real CRC is "; Hex (4, real_crc)];
tag_crc = real_crc
)
in
if crc_ok then (
let s = Ptr.Ref.new_seq lame_part in
Ptr.Ref.set_seq s 72;
let g = Ptr.Ref.get_seq s in
let lameRevision = g 4 in
let lameVBRMethod = g 4 in
let lameLowpass = g 8 in
let lamePeakAmplitude =
let b12 = g 16 in
let b34 = g 16 in
Int32.float_of_bits (Int32.logor (Int32.shift_left (Int32.of_int b12) 16) (Int32.of_int b34))
in
let lameRGTrack = g 16 in
let lameRGAlbum = g 16 in
let lameNoGapPrev = g 1 <> 0 in
let lameNoGapNext = g 1 <> 0 in
let lameNSSafeJoint = g 1 <> 0 in
let lameNSPsyTune = g 1 <> 0 in
let lameATHType = g 4 in
let lameABRBitrate = g 8 in
let lameDelayStart = g 12 in
let lameDelayEnd = g 12 in
let lameSourceFrequency = g 2 in
let lameUnwise = g 1 <> 0 in
let lameStereoMode = g 3 in
let lameNoiseShaping = g 2 in
let lameMP3Gain = g 8 in
let _ = g 2 in (* 2 unused bits *)
let lameSurround = g 3 in
let lamePreset = g 11 in
let lameMusicLength = g 32 in
let lameMusicCRC = g 16 in
Some {lameRevision;lameVBRMethod;lameLowpass;lamePeakAmplitude;lameRGTrack;lameRGAlbum;lameNoGapPrev;lameNoGapNext;lameNSSafeJoint;lameNSPsyTune;lameATHType;lameABRBitrate;lameDelayStart;lameDelayEnd;lameSourceFrequency;lameUnwise;lameStereoMode;lameNoiseShaping;lameMP3Gain;lameSurround;lamePreset;lameMusicLength;lameMusicCRC}
) else (
(* Not LAME *)
None
)
)
)
method xing_of_frame : type id chan. (id,chan) input_frame_t -> _(*Types.lameTag_t option * Ptr.Ref.ref_t*) = fun f -> (
(* Returns (lame_perhaps, encoder) *)
let rec count_zeros frame_raw now num =
if now >= Ptr.Ref.length frame_raw || Ptr.Ref.ref_get_byte frame_raw now <> 0 then (
num
) else (
count_zeros frame_raw (succ now) (succ num)
)
in
let num_zeros = count_zeros f.if_raw 6 0 in
if num_zeros < 7 || num_zeros > 32 then (o#p [Str " XING search found "; Int num_zeros; Str " zeros (not between 7 and 32)"]; raise Not_found);
if num_zeros + 10 > Ptr.Ref.length f.if_raw then (o#p [Str " XING search found "; Int (Ptr.Ref.length f.if_raw); Str " bytes in frame; not long enough for XING"]; raise Not_found); (* Frame is too short to have an XING tag *)
(* let tag_type = String.sub f.if_frame_string (num_zeros + 6) 4 in*)
let tag_type = Ptr.Ref.to_string (Ptr.Ref.sub f.if_raw (num_zeros + 6) 4) in
if tag_type <> "Xing" && tag_type <> "Info" then (o#p [Str " XING search found unknown tag type "; StrS tag_type]; raise Not_found);
(* NOW with less dependence on strings! *)
let tag_guts = Ptr.Ref.new_seq f.if_raw in
Ptr.Ref.set_seq tag_guts (8 * (header_bytes + 2 + 4 + num_zeros));
let zeros = Ptr.Ref.get_seq tag_guts 24 in
if zeros <> 0 then (o#p [Str " XING_a search flags not padded with zeros"]; raise Not_found);
(* Do the flags *)
let flags = Ptr.Ref.get_seq tag_guts 8 in
if flags > 15 then (o#p [Str " XING_a search found flags > 15"]; raise Not_found);
o#p [Str "XING flags is "; Int flags];
let flag_frames =
if flags land 1 = 1 then (
let p = Ptr.Ref.get_seq_overflow tag_guts 32 in
o#p [Str " XING flag found "; Int p; Str " frames"];
Some p
) else (
None
)
in
let flag_bytes =
if flags land 2 = 2 then (
let p = Ptr.Ref.get_seq_overflow tag_guts 32 in
o#p [Str " XING flag found "; Int p; Str " bytes"];
Some p
) else (
None
)
in
let flag_toc =
if flags land 4 = 4 then (
let p = Array.make 100 0 in (* I don't think the specification guarantees this goes in order *)
for i = 0 to Array.length p - 1 do
p.(i) <- Ptr.Ref.get_seq_overflow tag_guts 8
done;
o#p [Str " XING flag found TOC:"; Fun (fun print -> Array.iter (fun n -> print (Spaces 1); print (Hex(2,n))) p)];
Some p
) else (
None
)
in
let flag_quality =
if flags land 8 = 8 then (
Some (Ptr.Ref.get_seq_overflow tag_guts 32)
) else (
None
)
in
let from_name_bit = tag_guts.Ptr.Ref.seq_at in
let from_name = from_name_bit lsr 3 in
o#p [Str "first from_name is "; Int from_name];
if from_name > Ptr.Ref.length tag_guts.Ptr.Ref.seq_ref then (
o#p [Str " XING reading went past the end of the frame"];
raise Not_found
);
if from_name_bit land 7 <> 0 then (
o#p [Str " XING tag is not a full multiple of bytes (huh?)"];
raise Not_found
);
let (lame_perhaps, encoder) =
if from_name + 20 > Ptr.Ref.length tag_guts.Ptr.Ref.seq_ref then (
o#p [Str " XING search has not enough room for enocder; not LAME but still XING"];
(None, Ptr.Ref.null)
) else (
let encoder_20 = Ptr.Ref.sub tag_guts.Ptr.Ref.seq_ref from_name 20 in
if from_name + 36 > Ptr.Ref.length tag_guts.Ptr.Ref.seq_ref then (
o#p [Str " XING search sees not enough room for full LAME; returning XING with encoder"];
(None, encoder_20)
) else (
(* let lame_part = Ptr.Ref.sub tag_guts.Ptr.Ref.seq_ref from_name 36 in*)
match o#lame_of_ptrref tag_guts.Ptr.Ref.seq_ref from_name with
| Some lame -> (Some lame, Ptr.Ref.sub encoder_20 0 9)
| None -> (None, encoder_20)
)
)
in (* (lame_perhaps, encoder *)
let xing = {
xingRawTag = Ptr.Ref.to_string (Ptr.Ref.sub_last f.if_raw (header_bytes + 2 + num_zeros));
xingTagType = tag_type;
xingNumFrames = flag_frames;
xingNumBytes = flag_bytes;
xingTOC = flag_toc;
xingQuality = flag_quality;
xingEncoder = Ptr.Ref.to_string encoder;
xingLame = lame_perhaps;
} in
xing
)
val mutable val_force_resync = true
method find_next_frame ?(num_frames=3) ?(force_resync=val_force_resync) ?(lame_search=false) req = (
let frame_info_perhaps =
if force_resync then (
val_force_resync <- false;
o#resync_here num_frames req
) else (
let pos_now = o#pos in
match o#get_frame_here req with
| Ret_none -> (
(* Sync error; couldn't find a frame here *)
o#seek pos_now;
o#resync_here num_frames req
)
| Ret_eof -> None
| Ret_some x -> Some (req, x, (pos_now, pos_now))
)
in
match frame_info_perhaps with
| None -> raise End_of_file
| Some (req2, IF_ext f, resync_needed) -> (
(* Update the frame bounds *)
first_frame_start <- min first_frame_start (snd resync_needed);
last_frame_end <- max last_frame_end ((snd resync_needed) + Ptr.Ref.length f.if_raw - 1);
if lame_search then (try
f.if_xing <- Some (o#xing_of_frame f);
(req2, IF_ext f, resync_needed)
with
Not_found -> (req2, IF_ext f, resync_needed)
) else (
(req2, IF_ext f, resync_needed)
)
)
)
end
;;
class mp3read_ptr_2 print_fun in_file =
object
inherit virt_mp3read_2
method private p = print_fun
val handle = Unicode.openfile_utf8 in_file [Unix.O_RDONLY] 0o600
val mutable ptr = Ptr.make 0 0
val mutable pos = 0
val mutable len = 0
method seek i = pos <- i
method pos = pos
method length = len
method read s r l = (
if l = 0 then (
()
) else if pos < 0 || l < 0 then (
invalid_arg (Printf.sprintf "mp3read_ptr#read %d %d from %d (File length %d)" r l pos len)
) else if pos + l > len then (
raise End_of_file
) else (
Ptr.blit_to_string ptr pos s r l;
pos <- pos + l;
)
)
method close = (
Ptr.unmap ptr;
ptr <- Ptr.make 0 0;
len <- 0;
Unix.close handle;
)
method read_ptrref l = (
if pos + l > len then (
pos <- len;
raise End_of_file
) else (
let ret = Ptr.Ref.of_subptr ptr pos l in
pos <- pos + l;
ret
)
)
initializer (
ptr <- Ptr.map_handle handle 0 0 Ptr.Map_read_only;
len <- Unix.lseek handle 0 Unix.SEEK_END;
)
end
;;
(*
let header_of_ptrref p r =
if Ptr.Ref.length r < 4 then None else (
try
let b = Ptr.Ref.get_bits r in
if b 0 11 <> 0x7FF then (p [Str " SYNC'S WRONG"]; raise Not_found);
let id_index = b 11 2 in
if id_index = 1 then (p [Str " ID'S WRONG"]; raise Not_found);
let id = mpeg_index.(id_index) in
if b 13 2 <> 1 then (p [Str " LAYER'S NOT 3"]; raise Not_found);
let crc = (b 15 1 = 0) in
let (bitrate, samplerate) =
let bitrate_index = b 16 4 in
let samplerate_index = b 20 2 in
if bitrate_index = 0 || bitrate_index = 15 then (p [Str " INVALID BITRATE"]; raise Not_found);
if samplerate_index = 3 then (p [Str " INVALID SAMPLERATE"]; raise Not_found);
((bitrate_array_of_id id).(bitrate_index), (samplerate_index_of_id id).(samplerate_index))
in
let padding = (b 22 1 = 1) in
let priv = (b 23 1 = 1) in
let channel_mode = channel_index.(b 24 2) in
let ms = (b 26 1 = 1) in
let is = (b 27 1 = 1) in
let copyright = (b 28 1 = 1) in
let original = (b 29 1 = 1) in
let emphasis = emphasis_index.(b 30 2) in
Some {
header_raw = r;
header_id = id;
header_crc = crc;
header_bitrate = bitrate;
header_samplerate = samplerate;
header_padding = padding;
header_private = priv;
header_channel_mode = channel_mode;
header_ms = ms;
header_is = is;
header_copyright = copyright;
header_original = original;
header_emphasis = emphasis;
}
with
| Not_found -> None
)
;;
*)
(*
let side_info_of_header header side =
let gb = Ptr.Ref.get_bits side in
match (header.header_id, header.header_channel_mode) with
| (MPEG1, ChannelMono) -> (
let off = gb 0 9 in
let g1 = gb 18 12 in
let g2 = gb 77 12 in
{
side_raw = side;
side_offset = off;
side_bits = [| g1; g2 |];
side_bytes = (g1 + g2 + 7) asr 3;
}
)
| (MPEG1, _) -> (
let off = gb 0 9 in
let g1 = gb 20 12 in
let g2 = gb 79 12 in
let g3 = gb 138 12 in
let g4 = gb 197 12 in
{
side_raw = side;
side_offset = off;
side_bits = [| g1; g2; g3; g4 |];
side_bytes = (g1 + g2 + g3 + g4 + 7) asr 3;
}
)
| (_, ChannelMono) -> (
let off = gb 0 8 in
let g1 = gb 9 12 in
{
side_raw = side;
side_offset = off;
side_bits = [| g1 |];
side_bytes = (g1 + 7) asr 3;
}
)
| (_, _) -> (
let off = gb 0 8 in
let g1 = gb 10 12 in
let g2 = gb 73 12 in
{
side_raw = side;
side_offset = off;
side_bits = [| g1; g2 |];
side_bytes = (g1 + g2 + 7) asr 3;
}
)
;;
(* This function has to be here in order to take advantage of both mp3types and pack *)
let side_info_of_if f = (
let side = f.if_side_raw in
let gb = Ptr.Ref.get_bits side in
match (f.if_header.header_id, f.if_header.header_channel_mode) with
| (MPEG1, ChannelMono) -> (
let off = gb 0 9 in
let g1 = gb 18 12 in
let g2 = gb 77 12 in
{
(* side_raw_string = f.if_side_string;*)
side_raw = side;
side_offset = off;
side_bits = [| g1; g2 |];
side_bytes = (g1 + g2 + 7) asr 3;
}
)
| (MPEG1, _) -> (
let off = gb 0 9 in
let g1 = gb 20 12 in
let g2 = gb 79 12 in
let g3 = gb 138 12 in
let g4 = gb 197 12 in
{
(* side_raw_string = f.if_side_string;*)
side_raw = side;
side_offset = off;
side_bits = [| g1; g2; g3; g4 |];
side_bytes = (g1 + g2 + g3 + g4 + 7) asr 3;
}
)
| (_, ChannelMono) -> (
let off = gb 0 8 in
let g1 = gb 9 12 in
{
(* side_raw_string = f.if_side_string;*)
side_raw = side;
side_offset = off;
side_bits = [| g1 |];
side_bytes = (g1 + 7) asr 3;
}
)
| (_, _) -> (
let off = gb 0 8 in
let g1 = gb 10 12 in
let g2 = gb 73 12 in
{
(* side_raw_string = f.if_side_string;*)
side_raw = side;
side_offset = off;
side_bits = [| g1; g2 |];
side_bytes = (g1 + g2 + 7) asr 3;
}
)
);;
let get_current_crc header side_raw =
if header.header_crc then (
let validate_this = Ptr.Ref.append (Ptr.Ref.sub header.header_raw 2 2) side_raw in
Crc.mp3_create_ptrref validate_this 0xFFFF
) else (
(* This is always an invalid CRC *)
-1
)
;;
*)
(*
(* Try to make this work with an Int64 thing *)
class virtual virt_mp3read (*?(debug=false)*)(* in_file*) =
object(o)
method private virtual p : p_type list -> unit
val mutable req = {
req_id = Req_equal;
req_crc = Req_any;
req_bitrate = Req_any;
req_samplerate = Req_equal;
req_padding = Req_any;
req_private = Req_any;
req_channel_mode = Req_any;
req_ms = Req_any;
req_is = Req_any;
req_copyright = Req_any;
req_original = Req_any;
req_emphasis = Req_any;
}
(* val bitstream = Buffer.create 511*)
val mutable frame_number = 0
(* val xing_tag = None*)
val mutable first_frame_start = max_int
val mutable last_frame_end = 0
method first_mp3_byte = first_frame_start
method last_mp3_byte = last_frame_end
(*
val handle = open_in_bin in_file
method seek i = seek_in handle i
method pos = pos_in handle
method length = in_channel_length handle
method read s o l = really_input handle s o l
method close = close_in handle
*)
method virtual seek : int -> unit
method virtual pos : int
method virtual length : int
method virtual read : string -> int -> int -> unit
method virtual read_ptrref : int -> Ptr.Ref.ref_t
method virtual close : unit
(* method virtual unix_handle : Unix.file_descr (* There should be a better way to do this *)*)
(* Take a Ptr.Ref.t and return Some xyz if it's a valid header string, None otherwise *)
method header_of_ptrref = header_of_ptrref o#p
(* Get a frame at the current pos_in, assuming it satisfies the requirements *)
method get_frame_here reqs = (
let start_pos = o#pos in
o#p [Str "get_frame_here at "; Int start_pos];
try
(* let header_string = String.create 4 in*)
let header_ptrref = (try
o#read_ptrref 4
with
End_of_file -> (o#p [Str "Got EOF reading frame header"]; raise Not_found)
) in
o#p [Str " Got bytes "; Ptrref header_ptrref];
match o#header_of_ptrref header_ptrref with
| None -> (
o#p [Str " SYNC ERROR AT "; Int (o#pos - 4)];
Fp_none
)
| Some header -> (
(* Now match the requirements *)
let stringify_list str_fun l f = List.iter (fun x -> f (Str " "); f (Str (str_fun x))) l in
let handle_error p_name p_val p_stringify x =
o#p [Spaces 1; Str p_name; Spaces 1; p_val; Str " is not in ["; Fun (stringify_list p_stringify x); Str " ]"];
false
in
let found_match = match reqs with
(* | {req_id = Req_matches x} when not (List.mem header.header_id x) -> handle_error "ID" (Str (string_of_mpeg header.header_id) ) string_of_mpeg x*)
| {req_id = Req_matches x} when not (List.mem header.header_id x) -> handle_error "ID" (Str (string_of_mpeg header.header_id) ) string_of_mpeg x
| {req_crc = Req_matches x} when not (List.mem header.header_crc x) -> handle_error "CRC" (Bool header.header_crc ) string_of_bool x
| {req_bitrate = Req_matches x} when not (List.mem header.header_bitrate x) -> handle_error "Bitrate" (Int header.header_bitrate ) string_of_int x
| {req_samplerate = Req_matches x} when not (List.mem header.header_samplerate x) -> handle_error "Samplerate" (Int (int_of_samplerate header.header_samplerate) ) (fun n -> string_of_int @@ int_of_samplerate n) x
| {req_padding = Req_matches x} when not (List.mem header.header_padding x) -> handle_error "Padding" (Bool header.header_padding ) string_of_bool x
| {req_private = Req_matches x} when not (List.mem header.header_private x) -> handle_error "Private" (Bool header.header_private ) string_of_bool x
| {req_channel_mode = Req_matches x} when not (List.mem header.header_channel_mode x) -> handle_error "Channel mode" (Str (string_of_channel header.header_channel_mode)) string_of_channel x
| {req_ms = Req_matches x} when not (List.mem header.header_ms x) -> handle_error "MS" (Bool header.header_ms ) string_of_bool x
| {req_is = Req_matches x} when not (List.mem header.header_is x) -> handle_error "IS" (Bool header.header_is ) string_of_bool x
| {req_copyright = Req_matches x} when not (List.mem header.header_copyright x) -> handle_error "Copyright" (Bool header.header_copyright ) string_of_bool x
| {req_original = Req_matches x} when not (List.mem header.header_original x) -> handle_error "Original" (Bool header.header_original ) string_of_bool x
| {req_emphasis = Req_matches x} when not (List.mem header.header_emphasis x) -> handle_error "Emphasis" (Str (string_of_emphasis header.header_emphasis) ) string_of_emphasis x
| _ -> true
in
if found_match then (
let frame_length = frame_length_of_header header in
let side_info_size = match (header.header_id, header.header_channel_mode) with
| (MPEG1 , ChannelMono) -> 17
| ((MPEG2|MPEG25), ChannelMono) -> 9
| (MPEG1 , _ ) -> 32
| ((MPEG2|MPEG25), _ ) -> 17
in
let data_raw_pos = (if header.header_crc then 6 else 4) + side_info_size in
(*
let frame_string = String.create frame_length in
String.blit header_string 0 frame_string 0 4; (* Copy the header to the frame string *)
o#read frame_string 4 (frame_length - 4);
*)
let after_header = o#read_ptrref (frame_length - 4) in
let frame = Ptr.Ref.append header_ptrref after_header in
o#p [Str "Frame ptr ref:"];
o#p [Str " "; Ptrref frame];
let side_raw = Ptr.Ref.sub frame (if header.header_crc then 6 else 4) side_info_size in
let crc_ok = if header.header_crc then (
let target_crc = Ptr.Ref.get_bits frame 32 16 in
let actual_crc = get_current_crc header side_raw in
o#p [Str " Frame CRCs: written is "; Hex (4,target_crc); Str ", real is "; Hex (4,actual_crc)];
target_crc = actual_crc
) else (
true
) in
if not crc_ok then o#p [Str " FRAME CRC IS INVALID"];
o#p [Str " Found requested frame from "; Int start_pos; Str " to "; Int o#pos];
Fp_some {
if_raw = frame;
if_header = header;
(* if_side_string = Ptr.Ref.to_string (Ptr.Ref.sub frame (if header.header_crc then 6 else 4) side_info_size);*)
if_side_raw = side_raw;
(* if_data_string = String.sub frame_string data_raw_pos (frame_length - data_raw_pos);*)
if_data_raw = Ptr.Ref.sub frame data_raw_pos (frame_length - data_raw_pos);
(* if_frame_string = frame_string;*)
if_crc_ok = crc_ok;
if_xing = None;
}
) else (
(* No match found *)
o#seek start_pos;
Fp_none
)
)
with
| End_of_file -> (o#p [Str " HIT THE EOF"]; o#seek start_pos; Fp_none)
| Not_found -> (o#p [Str " HIT THE EOF when reading header"]; o#seek start_pos; Fp_eof)
)
(* This takes some requirements and returns (new_reqs, first_frame, (started_at, found_at) option) option *)
method resync_here num_frames reqs = (
let start_pos = o#pos in
o#p [Str "resync_here at "; Int start_pos];
let rec find_frame_and_update_reqs more_frames reqs = (
let frame_perhaps = o#get_frame_here reqs in
match frame_perhaps with
| Fp_some f -> (
let new_pos = o#pos in
let equal_to_matches matches_list = function
| Req_equal -> Req_matches matches_list
| Req_any -> Req_any
| Req_matches x -> Req_matches x
in
let new_reqs = {
(* req_id = (match reqs.req_id with Req_equal -> Req_matches [f.if_header.header_id ] | x -> x);*)
req_id = equal_to_matches [f.if_header.header_id ] reqs.req_id;
req_crc = equal_to_matches [f.if_header.header_crc ] reqs.req_crc;
req_bitrate = equal_to_matches [f.if_header.header_bitrate ] reqs.req_bitrate;
req_samplerate = equal_to_matches [f.if_header.header_samplerate] reqs.req_samplerate;
req_padding = equal_to_matches [f.if_header.header_padding ] reqs.req_padding;
req_private = equal_to_matches [f.if_header.header_private ] reqs.req_private;
req_ms = equal_to_matches [f.if_header.header_ms ] reqs.req_ms;
req_is = equal_to_matches [f.if_header.header_is ] reqs.req_is;
req_copyright = equal_to_matches [f.if_header.header_copyright ] reqs.req_copyright;
req_original = equal_to_matches [f.if_header.header_original ] reqs.req_original;
req_emphasis = equal_to_matches [f.if_header.header_emphasis ] reqs.req_emphasis;
req_channel_mode = (
match f.if_header.header_channel_mode with
| ChannelStereo | ChannelJoint -> equal_to_matches [ChannelStereo; ChannelJoint] reqs.req_channel_mode
| ChannelMono -> equal_to_matches [ChannelMono] reqs.req_channel_mode
| ChannelDual -> equal_to_matches [ChannelDual] reqs.req_channel_mode
(*
match (reqs.req_channel_mode, f.if_header.header_channel_mode) with (* Consider all stereo modes to be equal *)
| (Req_equal, ChannelStereo _) -> Req_matches [ChannelStereo StereoSimple; ChannelStereo StereoJoint; ChannelStereo StereoDual]
| (Req_equal, ChannelMono) -> Req_matches [ChannelMono]
| Req_equal when f.if_header.header_channel_mode = ChannelStereo || f.if_header.header_channel_mode = ChannelJoint -> Req_matches [ChannelStereo;ChannelJoint]
| Req_equal -> Req_matches [f.if_header.header_channel_mode]
| x -> x
*)
(*
match reqs.req_channel_mode with (* Consider all stereo modes to be equal *)
| Req_equal when f.if_header.header_channel_mode = ChannelStereo || f.if_header.header_channel_mode = ChannelJoint -> Req_matches [ChannelStereo;ChannelJoint]
| Req_equal -> Req_matches [f.if_header.header_channel_mode]
| x -> x
*)
);
} in
o#p [Str " resync_here found frame "; Int (num_frames - more_frames); Str " here"];
if more_frames > 1 then (
(* Get more frames *)
match find_frame_and_update_reqs (pred more_frames) new_reqs with
| None -> (o#seek start_pos; None) (* Oops. Not enough frames found *)
| Some (really_new_reqs, _) -> (o#seek new_pos; Some (really_new_reqs, f))
) else (
(* Just return this frame *)
Some (new_reqs, f)
)
)
| _ -> (o#seek start_pos; None) (* Uhh... right *)
) in
let rec find_sync_rec inky = (
o#seek (start_pos + inky);
match find_frame_and_update_reqs num_frames reqs with
| None -> (
if start_pos + inky + 4 >= o#length then (
raise End_of_file;
) else (
find_sync_rec (inky + 1)
)
)
(* | Some (r,f) when inky = 0 -> (r, f, (start_pos, start_pos))*)
| Some (r,f) -> (r, f, (start_pos, start_pos + inky))
) in
(try