X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=aac_afh.c;h=11dde5711976daad4ca42da1d6c8ca895e7a3972;hp=436005e0db128796618e6b34285dc06110a04c8e;hb=9902762e74e41165dfa18606411cef86ac7afd5d;hpb=55f0f9461990455656bef7a36b0f963e3d676653 diff --git a/aac_afh.c b/aac_afh.c index 436005e0..11dde571 100644 --- a/aac_afh.c +++ b/aac_afh.c @@ -1,121 +1,163 @@ /* - * Copyright (C) 2006 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, + * Ahead Software AG */ -/** \file aac_afh.c para_server's aac audio format handler */ +/** \file aac_afh.c para_server's aac audio format handler */ -#include "server.cmdline.h" -#include "server.h" -#include "afs.h" +#include "para.h" #include "error.h" #include "string.h" +#include "afh.h" +#include "afs.h" +#include "server.h" #include "aac.h" -/* must be big enough to hold header */ -#define DEFAULT_INBUF_SIZE 65536 - -static FILE *infile; -static int inbuf_size; -static unsigned char *inbuf; -static ssize_t *chunk_table; -struct audio_format *af; +static int aac_find_stsz(unsigned char *buf, size_t buflen, off_t *skip) +{ + int i; -unsigned num_chunks, chunk_num; + for (i = 0; i + 16 < buflen; i++) { + unsigned char *p = buf + i; + unsigned sample_count, sample_size; -NeAACDecHandle handle; -static void aac_close_audio_file(void) -{ + if (p[0] != 's' || p[1] != 't' || p[2] != 's' || p[3] != 'z') + continue; + PARA_DEBUG_LOG("found stsz@%d\n", i); + i += 8; + sample_size = aac_read_int32(buf + i); + PARA_DEBUG_LOG("sample size: %d\n", sample_size); + i += 4; + sample_count = aac_read_int32(buf + i); + i += 4; + PARA_DEBUG_LOG("sample count: %d\n", sample_count); + *skip = i; + return sample_count; + } + return -E_STSZ; } -/* - * Init m4a file and write some tech data to given pointers. - */ -static int aac_get_file_info(FILE *file, char *info_str, long unsigned *frames, - int *seconds) +static ssize_t aac_compute_chunk_table(struct afh_info *afhi, + unsigned char *map, size_t numbytes) { - int ret, skip, decoder_len; - unsigned inbuf_len; - unsigned long rate = 0; - unsigned char channels = 0; + int ret, i; + size_t sum = 0; + off_t skip; - free(inbuf); - inbuf_size = DEFAULT_INBUF_SIZE; - inbuf = para_malloc(inbuf_size); - infile = file; - - PARA_INFO_LOG("file: %p\n", file); - ret = read(fileno(infile), inbuf, inbuf_size); - PARA_INFO_LOG("read %d bytes\n", ret); - if (ret <= 0) - return -E_AAC_READ; - PARA_INFO_LOG("checking aac %d bytes\n", ret); - inbuf_len = ret; - ret = aac_find_esds(inbuf, inbuf_len, &skip); + ret = aac_find_stsz(map, numbytes, &skip); if (ret < 0) return ret; - decoder_len = ret; - handle = aac_open(); - ret = NeAACDecInit(handle, inbuf + skip, - inbuf_len - skip, &rate, &channels); - PARA_INFO_LOG("rate: %lu, channels: %d\n", rate, channels); - + 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 > afhi->chunks_total) +// PARA_DEBUG_LOG("offset #%d: %zu\n", i, afhi->chunk_table[i]); + } + return skip; +} + +static int aac_set_chunk_tv(struct afh_info *afhi, + mp4AudioSpecificConfig *mp4ASC, long unsigned *seconds) +{ + 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(afhi->chunks_total, &total, &afhi->chunk_tv); + PARA_INFO_LOG("%luHz, %lus (%lu x %lums)\n", + mp4ASC->samplingFrequency, ms / 1000, + afhi->chunks_total, tv2ms(&afhi->chunk_tv)); + if (ms < 1000) + return -E_MP4ASC; + *seconds = ms / 1000; return 1; } /* - * Simple stream reposition routine + * Init m4a file and write some tech data to given pointers. */ -static int aac_reposition_stream(long unsigned request) +static int aac_get_file_info(char *map, size_t numbytes, + struct afh_info *afhi) { - return -E_AAC_REPOS; -} + int i; + size_t skip; + ssize_t ret; + unsigned long rate = 0, decoder_len; + unsigned char channels = 0; + mp4AudioSpecificConfig mp4ASC; + NeAACDecHandle handle = NULL; + unsigned char *umap = (unsigned char *) map; -static int get_chunk_size(long unsigned chunk_num) -{ - int ret; - if (chunk_num >= num_chunks) - return -1; - ret = chunk_table[chunk_num + 1] - chunk_table[chunk_num]; - if (!ret) - return ret; -#if 0 - PARA_DEBUG_LOG("chunk %d: %lli-%lli (%lli bytes)\n", - chunk_num, - chunk_table[chunk_num], - chunk_table[chunk_num + 1] - 1, - ret); -#endif + ret = aac_find_esds(umap, numbytes, &skip, &decoder_len); + if (ret < 0) + goto out; + handle = aac_open(); + ret = -E_AAC_AFH_INIT; + if (NeAACDecInit(handle, umap + skip, decoder_len, &rate, &channels)) + goto out; + if (!channels) + goto out; + PARA_DEBUG_LOG("rate: %lu, channels: %d\n", rate, channels); + ret = -E_MP4ASC; + if (NeAACDecAudioSpecificConfig(umap + skip, numbytes - skip, &mp4ASC)) + goto out; + if (!mp4ASC.samplingFrequency) + goto out; + ret = aac_compute_chunk_table(afhi, umap, numbytes); + if (ret < 0) + goto out; + 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); + sprintf(afhi->info_string, "%s:\n%s:\n%s:\n", + status_item_list[SI_AUDIO_FILE_INFO], + status_item_list[SI_TAGINFO1], + status_item_list[SI_TAGINFO2] + ); + tv_scale(20, &afhi->chunk_tv, &afhi->eof_tv); + ret = 1; +out: + if (handle) + NeAACDecClose(handle); return ret; } -char *aac_read_chunk(long unsigned current_chunk, ssize_t *len) -{ - return (char *)inbuf; -} - -void aac_afh_init(void *p) +static const char* aac_suffixes[] = {"m4a", "mp4", NULL}; +/** + * 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) { - af = p; - af->reposition_stream = aac_reposition_stream; - af->get_file_info = aac_get_file_info, - af->read_chunk = aac_read_chunk; - af->close_audio_file = aac_close_audio_file; - af->get_header_info = NULL; - af->chunk_tv.tv_sec = 0; - af->chunk_tv.tv_usec = 250 * 1000; - tv_scale(3, &af->chunk_tv, &af->eof_tv); + afh->get_file_info = aac_get_file_info, + afh->suffixes = aac_suffixes; }