X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=aac_afh.c;h=04461178bb7912e3fb893cc5cf0215d39f965368;hp=ab97cdad0da50177b0820651dfd69f7237a7cd27;hb=f31f8ceeaff0db558b63a46559e7d7464859d0c4;hpb=f7b6451de1f334d8ab13a1f9428a1b24a437ba1d diff --git a/aac_afh.c b/aac_afh.c index ab97cdad..04461178 100644 --- a/aac_afh.c +++ b/aac_afh.c @@ -1,19 +1,7 @@ /* - * Copyright (C) 2006-2007 Andre Noll + * Copyright (C) 2006-2008 Andre Noll * - * This program 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. - * - * This program 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 this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. + * Licensed under the GPL v2. For licencing details see COPYING. */ /* * based in parts on libfaad, Copyright (C) 2003-2005 M. Bakker, @@ -22,28 +10,15 @@ /** \file aac_afh.c para_server's aac audio format handler */ -#include "server.cmdline.h" -#include "server.h" -#include "vss.h" +#include + +#include "para.h" #include "error.h" +#include "afh.h" #include "string.h" #include "aac.h" -#include "fd.h" - -/** size of the input buffer, must be big enough to hold header */ -#define AAC_INBUF_SIZE 65536 - -static FILE *infile; -static void aac_close_audio_file(void) -{ - if (!infile) - return; - fclose(infile); - infile = NULL; -} - -static int aac_find_stsz(unsigned char *buf, unsigned buflen, size_t *skip) +static int aac_find_stsz(unsigned char *buf, size_t buflen, off_t *skip) { int i; @@ -53,147 +28,250 @@ static int aac_find_stsz(unsigned char *buf, unsigned buflen, size_t *skip) if (p[0] != 's' || p[1] != 't' || p[2] != 's' || p[3] != 'z') continue; - PARA_INFO_LOG("found stsz@%d\n", i); + PARA_DEBUG_LOG("found stsz@%d\n", i); i += 8; sample_size = aac_read_int32(buf + i); - PARA_INFO_LOG("sample size: %d\n", sample_size); + PARA_DEBUG_LOG("sample size: %d\n", sample_size); i += 4; sample_count = aac_read_int32(buf + i); i += 4; - PARA_INFO_LOG("sample count: %d\n", sample_count); + PARA_DEBUG_LOG("sample count: %d\n", sample_count); *skip = i; return sample_count; } - PARA_WARNING_LOG("stsz not found, buflen: %d\n", buflen); return -E_STSZ; } -static int read_chunk_table(struct audio_format_info *afi, unsigned char *inbuf, - size_t inbuf_len, size_t skip) +static int atom_cmp(unsigned char *buf1, char *buf2) { - int ret, i; - size_t sum = 0; + unsigned char *b2 = (unsigned char *)buf2; + + if (buf1[0] != b2[0]) + return 1; + if (buf1[1] != b2[1]) + return 1; + if (buf1[2] != b2[2]) + return 1; + if (buf1[3] != b2[3]) + return 1; + return 0; +} + +static int read_atom_header(unsigned char *buf, uint64_t *subsize, unsigned char type[5]) +{ + int i; + uint64_t size = (buf[0] << 24) + (buf[1] << 16) + (buf[2] << 8) + buf[3]; + + memcpy(type, buf + 4, 4); + type[4] = '\0'; + + PARA_DEBUG_LOG("size: %llu, type: %s\n", (long long unsigned)size, type); + if (size != 1) { + *subsize = size; + return 8; + } + buf += 4; + size = 0; + for (i = 0; i < 8; i++) + size |= ((uint64_t)buf[i]) << ((7 - i) * 8); + *subsize = size; + return 16; +} + +static char *get_tag(unsigned char *p, int size) +{ + char *buf; + + assert(size > 0); + buf = para_malloc(size + 1); + + memcpy(buf, p, size); + buf[size] = '\0'; + PARA_DEBUG_LOG("size: %d: %s\n", size, buf); + return buf; +} + +static void read_tags(unsigned char *buf, size_t buflen, struct afh_info *afhi) +{ + unsigned char *p = buf; + + while (p + 32 < buf + buflen) { + unsigned char *q, type1[5], type2[5]; + uint64_t size1, size2; + int ret, ret2; - for (;;) { - ret = aac_find_stsz(inbuf, inbuf_len, &skip); - if (ret >= 0) + ret = read_atom_header(p, &size1, type1); + ret2 = read_atom_header(p + ret, &size2, type2); + + if (size2 <= 16 || atom_cmp(type2, "data")) { + p += size1; + continue; + } + size2 -= 16; + q = p + ret + ret2 + 8; + if (q + size2 > buf + buflen) break; - ret = read(fileno(infile), inbuf, AAC_INBUF_SIZE); - if (ret <= 0) - return -E_AAC_READ; - inbuf_len = ret; - PARA_INFO_LOG("next buffer: %d bytes\n", ret); + if (!atom_cmp(type1, "©ART")) + afhi->tags.artist = get_tag(q, size2); + else if (!atom_cmp(type1, "©alb")) + afhi->tags.album = get_tag(q, size2); + else if (!atom_cmp(type1, "©nam")) + afhi->tags.title = get_tag(q, size2); + else if (!atom_cmp(type1, "©cmt")) + afhi->tags.comment = get_tag(q, size2); + else if (!atom_cmp(type1, "©day")) + afhi->tags.year = get_tag(q, size2); + p += size1; } - afi->chunks_total = ret; - PARA_INFO_LOG("sz table has %lu entries\n", afi->chunks_total); - afi->chunk_table = para_malloc((afi->chunks_total + 1) * sizeof(size_t)); - for (i = 1; i <= afi->chunks_total; i++) { - if (skip + 4 > inbuf_len) { - skip = inbuf_len - skip; - memmove(inbuf, inbuf + inbuf_len - skip, skip); - ret = read(fileno(infile), inbuf + skip, - AAC_INBUF_SIZE - skip); - if (ret <= 0) - return -E_AAC_READ; - inbuf_len = ret + skip; - skip = 0; - PARA_INFO_LOG("next buffer: %zu bytes\n", inbuf_len); +} + +static void read_meta(unsigned char *buf, size_t buflen, struct afh_info *afhi) +{ + unsigned char *p = buf; + + while (p + 4 < buf + buflen) { + + if (p[0] != 'i' || p[1] != 'l' || p[2] != 's' || p[3] != 't') { + p++; + continue; } - sum += aac_read_int32(inbuf + skip); - afi->chunk_table[i] = sum; + p += 4; + return read_tags(p, buflen - (p - buf), afhi); + } +} + +static void aac_get_taginfo(unsigned char *buf, size_t buflen, + struct afh_info *afhi) +{ + int i; + uint64_t subsize; + unsigned char type[5]; + + for (i = 0; i + 24 < buflen; i++) { + unsigned char *p = buf + i; + if (p[0] != 'm' || p[1] != 'e' || p[2] != 't' || p[3] != 'a') + continue; + PARA_INFO_LOG("found metadata at offset %d\n", i); + i += 8; + p = buf + i; + i += read_atom_header(p, &subsize, type); + p = buf + i; + return read_meta(p, buflen - i, afhi); + } + PARA_INFO_LOG("no meta data\n"); +} + +static ssize_t aac_compute_chunk_table(struct afh_info *afhi, + unsigned char *map, size_t numbytes) +{ + int ret, i; + size_t sum = 0; + off_t skip; + + ret = aac_find_stsz(map, numbytes, &skip); + if (ret < 0) + return ret; + afhi->chunks_total = ret; + PARA_DEBUG_LOG("sz table has %lu entries\n", afhi->chunks_total); + afhi->chunk_table = para_malloc((afhi->chunks_total + 1) * sizeof(size_t)); + for (i = 1; i <= afhi->chunks_total; i++) { + if (skip + 4 > numbytes) + break; + sum += aac_read_int32(map + skip); + afhi->chunk_table[i] = sum; skip += 4; - if (i < 10 || i + 10 > afi->chunks_total) - PARA_DEBUG_LOG("offset #%d: %zu\n", i, afi->chunk_table[i]); +// if (i < 10 || i + 10 > afhi->chunks_total) +// PARA_DEBUG_LOG("offset #%d: %zu\n", i, afhi->chunk_table[i]); } - return 1; + return skip; } -static long unsigned aac_set_chunk_tv(struct audio_format_info *afi, - mp4AudioSpecificConfig *mp4ASC) +static int aac_set_chunk_tv(struct afh_info *afhi, + mp4AudioSpecificConfig *mp4ASC, long unsigned *seconds) { - float tmp = mp4ASC->sbr_present_flag == 1? 2047 : 1023, - ms = 1000.0 * afi->chunks_total * tmp / mp4ASC->samplingFrequency; + float tmp = mp4ASC->sbr_present_flag == 1? 2047 : 1023; struct timeval total; + long unsigned ms = 1000.0 * afhi->chunks_total * tmp + / mp4ASC->samplingFrequency; + if (!mp4ASC->samplingFrequency) + return -E_MP4ASC; + ms = 1000.0 * afhi->chunks_total * tmp / mp4ASC->samplingFrequency; ms2tv(ms, &total); - tv_divide(afi->chunks_total, &total, &afi->chunk_tv); - PARA_INFO_LOG("%luHz, %fs (%lu x %lums)\n", + tv_divide(afhi->chunks_total, &total, &afhi->chunk_tv); + PARA_INFO_LOG("%luHz, %lus (%lu x %lums)\n", mp4ASC->samplingFrequency, ms / 1000, - afi->chunks_total, tv2ms(&afi->chunk_tv)); - return ms / 1000; + afhi->chunks_total, tv2ms(&afhi->chunk_tv)); + if (ms < 1000) + return -E_MP4ASC; + *seconds = ms / 1000; + return 1; } /* * Init m4a file and write some tech data to given pointers. */ -static int aac_get_file_info(FILE *file, struct audio_format_info *afi) +static int aac_get_file_info(char *map, size_t numbytes, __a_unused int fd, + struct afh_info *afhi) { - int i, ret, decoder_len; - size_t inbuf_len, skip; - unsigned long rate = 0; - unsigned char channels = 0, *inbuf = para_malloc(AAC_INBUF_SIZE); + int i; + size_t skip; + ssize_t ret; + unsigned long rate = 0, decoder_len; + unsigned char channels = 0; mp4AudioSpecificConfig mp4ASC; - NeAACDecHandle handle; + NeAACDecHandle handle = NULL; + unsigned char *umap = (unsigned char *) map; - infile = file; - ret = read(fileno(infile), inbuf, AAC_INBUF_SIZE); - if (ret <= 0) { - ret = -E_AAC_READ; - goto out; - } - inbuf_len = ret; - ret = aac_find_esds(inbuf, inbuf_len, &skip); + ret = aac_find_esds(umap, numbytes, &skip, &decoder_len); if (ret < 0) goto out; - decoder_len = ret; + aac_get_taginfo(umap, numbytes, afhi); handle = aac_open(); - ret = NeAACDecInit(handle, inbuf + skip, decoder_len, &rate, &channels); - if (ret < 0) { - ret = -E_AACDEC_INIT; + ret = -E_AAC_AFH_INIT; + if (NeAACDecInit(handle, umap + skip, decoder_len, &rate, &channels)) goto out; - } - skip += ret; - PARA_INFO_LOG("rate: %lu, channels: %d\n", rate, channels); + if (!channels) + goto out; + PARA_DEBUG_LOG("rate: %lu, channels: %d\n", rate, channels); ret = -E_MP4ASC; - if (NeAACDecAudioSpecificConfig(inbuf + skip, inbuf_len - skip, - &mp4ASC) < 0) + if (NeAACDecAudioSpecificConfig(umap + skip, numbytes - skip, &mp4ASC)) goto out; - ret = read_chunk_table(afi, inbuf, inbuf_len, skip); + if (!mp4ASC.samplingFrequency) + goto out; + ret = aac_compute_chunk_table(afhi, umap, numbytes); if (ret < 0) goto out; - afi->seconds_total = aac_set_chunk_tv(afi, &mp4ASC); - for (;;) { - ret = aac_find_entry_point(inbuf, inbuf_len, &skip); - if (ret >= 0) - break; - ret = read(fileno(infile), inbuf, AAC_INBUF_SIZE); - if (ret <= 0) { - ret = -E_AAC_READ; - goto out; - } - inbuf_len = ret; - PARA_INFO_LOG("next buffer: %d bytes\n", ret); - } - afi->chunk_table[0] = ret; - for (i = 1; i<= afi->chunks_total; i++) - afi->chunk_table[i] += ret; - sprintf(afi->info_string, "audio_file_info1:%lu x %lums\n" - "audio_file_info2:\n" - "audio_file_info3:\n", - afi->chunks_total, - tv2ms(&afi->chunk_tv)); - tv_scale(20, &afi->chunk_tv, &afi->eof_tv); + skip = ret; + ret = aac_set_chunk_tv(afhi, &mp4ASC, &afhi->seconds_total); + if (ret < 0) + goto out; + ret = aac_find_entry_point(umap + skip, numbytes - skip, &skip); + if (ret < 0) + goto out; + afhi->chunk_table[0] = ret; + for (i = 1; i<= afhi->chunks_total; i++) + afhi->chunk_table[i] += ret; + afhi->channels = channels; + afhi->frequency = rate; + ret = (afhi->chunk_table[afhi->chunks_total] - afhi->chunk_table[0]) * 8; /* bits */ + ret += (channels * afhi->seconds_total * 500); /* avoid rounding error */ + afhi->bitrate = ret / (channels * afhi->seconds_total * 1000); ret = 1; out: - free(inbuf); + if (handle) + NeAACDecClose(handle); return ret; } static const char* aac_suffixes[] = {"m4a", "mp4", NULL}; -/** the init function of the aac audio format handler */ -void aac_afh_init(struct audio_format_handler *p) +/** + * the init function of the aac audio format handler + * + * \param afh pointer to the struct to initialize + */ +void aac_afh_init(struct audio_format_handler *afh) { - p->get_file_info = aac_get_file_info, - p->close_audio_file = aac_close_audio_file; - p->suffixes = aac_suffixes; + afh->get_file_info = aac_get_file_info, + afh->suffixes = aac_suffixes; }