diff options
Diffstat (limited to 'plugins/alac/demux.c')
| -rw-r--r-- | plugins/alac/demux.c | 673 |
1 files changed, 673 insertions, 0 deletions
diff --git a/plugins/alac/demux.c b/plugins/alac/demux.c new file mode 100644 index 00000000..cc1ac240 --- /dev/null +++ b/plugins/alac/demux.c @@ -0,0 +1,673 @@ +/* + * ALAC (Apple Lossless Audio Codec) decoder + * Copyright (c) 2005 David Hammerton + * All rights reserved. + * + * This is the quicktime container demuxer. + * + * http://crazney.net/programs/itunes/alac.html + * + * Permission is hereby granted, free of charge, to any person + * obtaining a copy of this software and associated documentation + * files (the "Software"), to deal in the Software without + * restriction, including without limitation the rights to use, + * copy, modify, merge, publish, distribute, sublicense, and/or + * sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES + * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT + * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, + * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + * + */ + + +#include <string.h> +#include <stdio.h> +#include <stdlib.h> +#ifdef _WIN32 + #include "stdint_win.h" +#else + #include <stdint.h> +#endif + +#include "stream.h" +#include "demux.h" + +//#define trace(...) { fprintf(stderr, __VA_ARGS__); } +#define trace(fmt,...) + +typedef struct +{ + stream_t *stream; + demux_res_t *res; + long saved_mdat_pos; +} qtmovie_t; + + +/* chunk handlers */ +static void read_chunk_ftyp(qtmovie_t *qtmovie, size_t chunk_len) +{ + fourcc_t type; + uint32_t minor_ver; + size_t size_remaining = chunk_len - 8; /* FIXME: can't hardcode 8, size may be 64bit */ + + type = stream_read_uint32(qtmovie->stream); + size_remaining-=4; + if ((type != MAKEFOURCC('M','4','A',' ')) && + (type != MAKEFOURCC('m','4','a',' ')) && + (type != MAKEFOURCC('M','4','B',' ')) && + (type != MAKEFOURCC('m','p','4','2')) && + (type != MAKEFOURCC('3','g','p','6')) && + (type != MAKEFOURCC('q','t',' ',' ')) && + (type != MAKEFOURCC('i','s','o','m'))) + { + trace ("not M4A file\n"); + return; + } + minor_ver = stream_read_uint32(qtmovie->stream); + size_remaining-=4; + + /* compatible brands */ + while (size_remaining) + { + /* unused */ + /*fourcc_t cbrand =*/ stream_read_uint32(qtmovie->stream); + size_remaining-=4; + } +} + +static void read_chunk_tkhd(qtmovie_t *qtmovie, size_t chunk_len) +{ + /* don't need anything from here atm, skip */ + size_t size_remaining = chunk_len - 8; /* FIXME WRONG */ + + stream_skip(qtmovie->stream, size_remaining); +} + +static void read_chunk_edts(qtmovie_t *qtmovie, size_t chunk_len) +{ + /* don't need anything from here atm, skip */ + size_t size_remaining = chunk_len - 8; /* FIXME WRONG */ + + stream_skip(qtmovie->stream, size_remaining); +} + +static void read_chunk_elst(qtmovie_t *qtmovie, size_t chunk_len) +{ + /* don't need anything from here atm, skip */ + size_t size_remaining = chunk_len - 8; /* FIXME WRONG */ + + stream_skip(qtmovie->stream, size_remaining); +} + +static int read_chunk_stsd(qtmovie_t *qtmovie, size_t chunk_len) +{ + unsigned int i; + uint32_t numentries; + size_t size_remaining = chunk_len - 8; + + /* version */ + stream_read_uint8(qtmovie->stream); + size_remaining -= 1; + /* flags */ + stream_read_uint8(qtmovie->stream); + stream_read_uint8(qtmovie->stream); + stream_read_uint8(qtmovie->stream); + size_remaining -= 3; + + numentries = stream_read_uint32(qtmovie->stream); + size_remaining -= 4; + +// if (numentries != 1) +// { +// trace ("only expecting one entry in sample description atom!\n"); +// return 0; +// } + + for (i = 0; i < numentries; i++) + { + uint32_t entry_size; + + uint32_t entry_remaining; + + entry_size = stream_read_uint32(qtmovie->stream); + qtmovie->res->format = stream_read_uint32(qtmovie->stream); + trace ("format: %c%c%c%c\n",SPLITFOURCC(qtmovie->res->format)); + entry_remaining = entry_size; + entry_remaining -= 8; + + + /* sound info: */ + + /* reserved + data reference index + sound version + reserved */ + stream_skip(qtmovie->stream, 6 + 2 + 2 + 6); + entry_remaining -= 6 + 2 + 2 + 6; + + qtmovie->res->num_channels = stream_read_uint16(qtmovie->stream); + qtmovie->res->sample_size = stream_read_uint16(qtmovie->stream); + entry_remaining -= 4; + + /* packet size */ + stream_skip(qtmovie->stream, 2); + qtmovie->res->sample_rate = stream_read_uint32(qtmovie->stream); + /* reserved size */ + stream_skip(qtmovie->stream, 2); + entry_remaining -= 8; + + /* remaining is codec data */ + /* 12 = audio format atom, 8 = padding */ + qtmovie->res->codecdata_len = entry_remaining + 12 + 8; + if (qtmovie->res->codecdata_len > 64) + { + trace ("codecdata too large (%d) in stsd\n", + (int)qtmovie->res->codecdata_len); + return 0; + } + + memset(qtmovie->res->codecdata, 0, qtmovie->res->codecdata_len); + /* audio format atom */ +#if 0 + /* The ALAC decoder skips these bytes, so there is no need to store them, + and this code isn't endian/alignment safe */ + ((unsigned int*)qtmovie->res->codecdata)[0] = 0x0c000000; + ((unsigned int*)qtmovie->res->codecdata)[1] = MAKEFOURCC('a','m','r','f'); + ((unsigned int*)qtmovie->res->codecdata)[2] = MAKEFOURCC('c','a','l','a'); +#endif + + stream_read(qtmovie->stream, + entry_remaining, + ((char*)qtmovie->res->codecdata) + 12); + entry_remaining -= entry_remaining; + + if (entry_remaining) + stream_skip(qtmovie->stream, entry_remaining); + + + qtmovie->res->format_read = 1; + if (qtmovie->res->format != MAKEFOURCC('a','l','a','c')) + { + /*trace ("expecting 'alac' data format, got %c%c%c%c\n", + SPLITFOURCC(qtmovie->res->format));*/ + return 0; + } + } + + return 1; +} + +static void read_chunk_stts(qtmovie_t *qtmovie, size_t chunk_len) +{ + unsigned int i; + uint32_t numentries; + size_t size_remaining = chunk_len - 8; /* FIXME WRONG */ + + /* version */ + stream_read_uint8(qtmovie->stream); + size_remaining -= 1; + /* flags */ + stream_read_uint8(qtmovie->stream); + stream_read_uint8(qtmovie->stream); + stream_read_uint8(qtmovie->stream); + size_remaining -= 3; + + numentries = stream_read_uint32(qtmovie->stream); + size_remaining -= 4; + + qtmovie->res->num_time_to_samples = numentries; + qtmovie->res->time_to_sample = malloc(numentries * sizeof(*qtmovie->res->time_to_sample)); + + for (i = 0; i < numentries; i++) + { + qtmovie->res->time_to_sample[i].sample_count = stream_read_uint32(qtmovie->stream); + qtmovie->res->time_to_sample[i].sample_duration = stream_read_uint32(qtmovie->stream); + size_remaining -= 8; + } + + if (size_remaining) + { + trace ("ehm, size remianing?\n"); + stream_skip(qtmovie->stream, size_remaining); + } +} + +static void read_chunk_stsz(qtmovie_t *qtmovie, size_t chunk_len) +{ + unsigned int i; + uint32_t numentries; + size_t size_remaining = chunk_len - 8; /* FIXME WRONG */ + + /* version */ + stream_read_uint8(qtmovie->stream); + size_remaining -= 1; + /* flags */ + stream_read_uint8(qtmovie->stream); + stream_read_uint8(qtmovie->stream); + stream_read_uint8(qtmovie->stream); + size_remaining -= 3; + + /* default sample size */ + if (stream_read_uint32(qtmovie->stream) != 0) + { + trace ("i was expecting variable samples sizes\n"); + stream_read_uint32(qtmovie->stream); + size_remaining -= 4; + return; + } + size_remaining -= 4; + + numentries = stream_read_uint32(qtmovie->stream); + size_remaining -= 4; + + qtmovie->res->num_sample_byte_sizes = numentries; + qtmovie->res->sample_byte_size = malloc(numentries * sizeof(*qtmovie->res->sample_byte_size)); + + for (i = 0; i < numentries; i++) + { + qtmovie->res->sample_byte_size[i] = stream_read_uint32(qtmovie->stream); + size_remaining -= 4; + } + + if (size_remaining) + { + trace ("ehm, size remianing?\n"); + stream_skip(qtmovie->stream, size_remaining); + } +} + +static int read_chunk_stbl(qtmovie_t *qtmovie, size_t chunk_len) +{ + size_t size_remaining = chunk_len - 8; /* FIXME WRONG */ + + while (size_remaining) + { + size_t sub_chunk_len; + fourcc_t sub_chunk_id; + + sub_chunk_len = stream_read_uint32(qtmovie->stream); + if (sub_chunk_len <= 1 || sub_chunk_len > size_remaining) + { + trace ("strange size for chunk inside stbl (%lu) (remaining: %lu)\n", + sub_chunk_len, size_remaining); + return 0; + } + + sub_chunk_id = stream_read_uint32(qtmovie->stream); + + switch (sub_chunk_id) + { + case MAKEFOURCC('s','t','s','d'): + if (read_chunk_stsd(qtmovie, sub_chunk_len) == 0) + return 0; + break; + case MAKEFOURCC('s','t','t','s'): + read_chunk_stts(qtmovie, sub_chunk_len); + break; + case MAKEFOURCC('s','t','s','z'): + read_chunk_stsz(qtmovie, sub_chunk_len); + break; + case MAKEFOURCC('s','t','s','c'): + case MAKEFOURCC('s','t','c','o'): + /* skip these, no indexing for us! */ + stream_skip(qtmovie->stream, sub_chunk_len - 8); + break; + default: + trace ("(stbl) unknown chunk id: %c%c%c%c\n", + SPLITFOURCC(sub_chunk_id)); + return 0; + } + + size_remaining -= sub_chunk_len; + } + + return 1; +} + +static int read_chunk_minf(qtmovie_t *qtmovie, size_t chunk_len) +{ + size_t dinf_size, stbl_size; + size_t size_remaining = chunk_len - 8; /* FIXME WRONG */ + + /**** SOUND HEADER CHUNK ****/ + if (stream_read_uint32(qtmovie->stream) != 16) + { + trace ("unexpected size in media info\n"); + return 0; + } + if (stream_read_uint32(qtmovie->stream) != MAKEFOURCC('s','m','h','d')) + { + trace ("not a sound header! can't handle this.\n"); + return 0; + } + /* now skip the rest */ + stream_skip(qtmovie->stream, 16 - 8); + size_remaining -= 16; + /****/ + + /**** DINF CHUNK ****/ + dinf_size = stream_read_uint32(qtmovie->stream); + if (stream_read_uint32(qtmovie->stream) != MAKEFOURCC('d','i','n','f')) + { + trace ("expected dinf, didn't get it.\n"); + return 0; + } + /* skip it */ + stream_skip(qtmovie->stream, dinf_size - 8); + size_remaining -= dinf_size; + /****/ + + + /**** SAMPLE TABLE ****/ + stbl_size = stream_read_uint32(qtmovie->stream); + if (stream_read_uint32(qtmovie->stream) != MAKEFOURCC('s','t','b','l')) + { + trace ("expected stbl, didn't get it.\n"); + return 0; + } + if (read_chunk_stbl(qtmovie, stbl_size) == 0) + return 0; + size_remaining -= stbl_size; + + if (size_remaining) + { + trace ("oops\n"); + stream_skip(qtmovie->stream, size_remaining); + } + + return 1; +} + +static int read_chunk_mdia(qtmovie_t *qtmovie, size_t chunk_len) +{ + size_t size_remaining = chunk_len - 8; /* FIXME WRONG */ + + while (size_remaining) + { + size_t sub_chunk_len; + fourcc_t sub_chunk_id; + + sub_chunk_len = stream_read_uint32(qtmovie->stream); + if (sub_chunk_len <= 1 || sub_chunk_len > size_remaining) + { + trace ("strange size for chunk inside mdia\n"); + return 0; + } + + sub_chunk_id = stream_read_uint32(qtmovie->stream); + + switch (sub_chunk_id) + { + case MAKEFOURCC('m','i','n','f'): + if (read_chunk_minf(qtmovie, sub_chunk_len) == 0) + return 0; + break; + default: + trace ("(mdia) unknown chunk id: %c%c%c%c\n", + SPLITFOURCC(sub_chunk_id)); + stream_skip(qtmovie->stream, sub_chunk_len - 8); + break;; + } + + size_remaining -= sub_chunk_len; + } + + return 1; +} + +/* 'trak' - a movie track - contains other atoms */ +static int read_chunk_trak(qtmovie_t *qtmovie, size_t chunk_len) +{ + size_t size_remaining = chunk_len - 8; /* FIXME WRONG */ + + while (size_remaining) + { + size_t sub_chunk_len; + fourcc_t sub_chunk_id; + + sub_chunk_len = stream_read_uint32(qtmovie->stream); + if (sub_chunk_len <= 1 || sub_chunk_len > size_remaining) + { + trace ("strange size for chunk inside trak\n"); + return 0; + } + + sub_chunk_id = stream_read_uint32(qtmovie->stream); + + switch (sub_chunk_id) + { + case MAKEFOURCC('t','k','h','d'): + read_chunk_tkhd(qtmovie, sub_chunk_len); + break; + case MAKEFOURCC('m','d','i','a'): + if (read_chunk_mdia(qtmovie, sub_chunk_len) == 0) + return 0; + break; + case MAKEFOURCC('e','d','t','s'): + read_chunk_edts(qtmovie, sub_chunk_len); + break; + default: + trace ("(trak) unknown chunk id: %c%c%c%c\n", + SPLITFOURCC(sub_chunk_id)); + return 0; + } + + size_remaining -= sub_chunk_len; + } + + return 1; +} + +/* 'mvhd' movie header atom */ +static void read_chunk_mvhd(qtmovie_t *qtmovie, size_t chunk_len) +{ + /* don't need anything from here atm, skip */ + size_t size_remaining = chunk_len - 8; /* FIXME WRONG */ + + stream_skip(qtmovie->stream, size_remaining); +} + +/* 'udta' user data.. contains tag info */ +static void read_chunk_udta(qtmovie_t *qtmovie, size_t chunk_len) +{ + /* don't need anything from here atm, skip */ + size_t size_remaining = chunk_len - 8; /* FIXME WRONG */ + + stream_skip(qtmovie->stream, size_remaining); +} + +/* 'iods' */ +static void read_chunk_iods(qtmovie_t *qtmovie, size_t chunk_len) +{ + /* don't need anything from here atm, skip */ + size_t size_remaining = chunk_len - 8; /* FIXME WRONG */ + + stream_skip(qtmovie->stream, size_remaining); +} + +/* 'moov' movie atom - contains other atoms */ +static int read_chunk_moov(qtmovie_t *qtmovie, size_t chunk_len) +{ + size_t size_remaining = chunk_len - 8; /* FIXME WRONG */ + + while (size_remaining) + { + size_t sub_chunk_len; + fourcc_t sub_chunk_id; + + sub_chunk_len = stream_read_uint32(qtmovie->stream); + if (sub_chunk_len <= 1 || sub_chunk_len > size_remaining) + { + trace ("strange size for chunk inside moov\n"); + return 0; + } + + sub_chunk_id = stream_read_uint32(qtmovie->stream); + + switch (sub_chunk_id) + { + case MAKEFOURCC('m','v','h','d'): + read_chunk_mvhd(qtmovie, sub_chunk_len); + break; + case MAKEFOURCC('t','r','a','k'): + if (read_chunk_trak(qtmovie, sub_chunk_len) == 0) + return 0; + break; + case MAKEFOURCC('u','d','t','a'): + read_chunk_udta(qtmovie, sub_chunk_len); + break; + case MAKEFOURCC('e','l','s','t'): + read_chunk_elst(qtmovie, sub_chunk_len); + break; + case MAKEFOURCC('i','o','d','s'): + read_chunk_iods(qtmovie, sub_chunk_len); + break; + default: + trace ("(moov) unknown chunk id: %c%c%c%c\n", + SPLITFOURCC(sub_chunk_id)); + return 0; + } + + size_remaining -= sub_chunk_len; + } + + return 1; +} + +static void read_chunk_mdat(qtmovie_t *qtmovie, size_t chunk_len, int skip_mdat) +{ + size_t size_remaining = chunk_len - 8; /* FIXME WRONG */ + + if (size_remaining == 0) return; + + qtmovie->res->mdat_len = (uint32_t)size_remaining; + if (skip_mdat) + { + qtmovie->saved_mdat_pos = stream_tell(qtmovie->stream); + stream_skip(qtmovie->stream, size_remaining); + } +#if 0 + qtmovie->res->mdat = malloc(size_remaining); + + stream_read(qtmovie->stream, size_remaining, qtmovie->res->mdat); +#endif +} + +static int set_saved_mdat(qtmovie_t *qtmovie) +{ + if (qtmovie->saved_mdat_pos == -1) + { + trace ("stream contains mdat before moov but is not seekable\n"); + return 0; + } + + if (stream_setpos(qtmovie->stream, qtmovie->saved_mdat_pos)) + { + trace ("error while seeking stream to mdat pos\n"); + return 0; + } + + return 1; +} + +int qtmovie_read(stream_t *file, demux_res_t *demux_res) +{ + int found_moov = 0; + int found_mdat = 0; + qtmovie_t *qtmovie; + + qtmovie = (qtmovie_t*)malloc(sizeof(qtmovie_t)); + memset (qtmovie, 0, sizeof (qtmovie_t)); + + /* construct the stream */ + qtmovie->stream = file; + + qtmovie->res = demux_res; + + memset(demux_res, 0, sizeof(demux_res_t)); + + /* read the chunks */ + while (1) + { + size_t chunk_len; + fourcc_t chunk_id; + + chunk_len = stream_read_uint32(qtmovie->stream); + if (stream_eof(qtmovie->stream)) + { + free (qtmovie); + return 0; + } + + if (chunk_len == 1) + { + trace ("need 64bit support\n"); + free (qtmovie); + return 0; + } + chunk_id = stream_read_uint32(qtmovie->stream); + + switch (chunk_id) + { + case MAKEFOURCC('f','t','y','p'): + read_chunk_ftyp(qtmovie, chunk_len); + break; + case MAKEFOURCC('m','o','o','v'): + if (read_chunk_moov(qtmovie, chunk_len) == 0) { + free (qtmovie); + return 0; /* failed to read moov, can't do anything */ + } + if (found_mdat) + { + int res = set_saved_mdat(qtmovie); + free (qtmovie); + return res; + } + found_moov = 1; + break; + /* if we hit mdat before we've found moov, record the position + * and move on. We can then come back to mdat later. + * This presumes the stream supports seeking backwards. + */ + case MAKEFOURCC('m','d','a','t'): + read_chunk_mdat(qtmovie, chunk_len, !found_moov); + if (found_moov) { + free (qtmovie); + return 1; + } + found_mdat = 1; + break; + + /* these following atoms can be skipped !!!! */ + case MAKEFOURCC('f','r','e','e'): + stream_skip(qtmovie->stream, chunk_len - 8); /* FIXME not 8 */ + break; + default: + trace ("(top) unknown chunk id: %c%c%c%c\n", + SPLITFOURCC(chunk_id)); + free (qtmovie); + return 0; + } + + } + free (qtmovie); + return 0; +} + + +void qtmovie_free_demux (demux_res_t *demux_res) { + if (demux_res->time_to_sample) { + free (demux_res->time_to_sample); + } + if (demux_res->sample_byte_size) { + free (demux_res->sample_byte_size); + } + memset (demux_res, 0, sizeof (demux_res_t)); +} |