dccp_send.c: Minor cleanups.
[paraslash.git] / aac_afh.c
index 436005e..be301c5 100644 (file)
--- a/aac_afh.c
+++ b/aac_afh.c
 /*
- * Copyright (C) 2006 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2006-2007 Andre Noll <maan@systemlinux.org>
  *
- *     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 "error.h"
 #include "string.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_INFO_LOG("found stsz@%d\n", i);
+               i += 8;
+               sample_size = aac_read_int32(buf + i);
+               PARA_INFO_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);
+               *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 audio_format_info *afi,
+               unsigned char *map, size_t numbytes)
 {
-       int ret, skip, decoder_len;
-       unsigned inbuf_len;
-       unsigned long rate = 0;
-       unsigned char channels = 0;
-
-       free(inbuf);
-       inbuf_size = DEFAULT_INBUF_SIZE;
-       inbuf = para_malloc(inbuf_size);
-       infile = file;
+       int ret, i;
+       size_t sum = 0;
+       off_t skip;
 
-       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);
-       
+       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 > numbytes)
+                       break;
+               sum += aac_read_int32(map + skip);
+               afi->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]);
+       }
+       return skip;
+}
+
+static int aac_set_chunk_tv(struct audio_format_info *afi,
+               mp4AudioSpecificConfig *mp4ASC, long unsigned *seconds)
+{
+       float tmp = mp4ASC->sbr_present_flag == 1? 2047 : 1023;
+       struct timeval total;
+       long unsigned ms = 1000.0 * afi->chunks_total * tmp
+               / mp4ASC->samplingFrequency;
+
+       if (!mp4ASC->samplingFrequency)
+               return -E_MP4ASC;
+       ms = 1000.0 * afi->chunks_total * tmp / mp4ASC->samplingFrequency;
+       ms2tv(ms, &total);
+       tv_divide(afi->chunks_total, &total, &afi->chunk_tv);
+       PARA_INFO_LOG("%luHz, %lus (%lu x %lums)\n",
+               mp4ASC->samplingFrequency, ms / 1000,
+               afi->chunks_total, tv2ms(&afi->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 audio_format_info *afi)
 {
-       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;
+       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_INFO_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(afi, umap, numbytes);
+       if (ret < 0)
+               goto out;
+       skip = ret;
+       ret = aac_set_chunk_tv(afi, &mp4ASC, &afi->seconds_total);
+       if (ret < 0)
+               goto out;
+       ret = aac_find_entry_point(umap + skip, numbytes - skip, &skip);
+       if (ret < 0)
+               goto out;
+       afi->chunk_table[0] = ret;
+       for (i = 1; i<= afi->chunks_total; i++)
+               afi->chunk_table[i] += ret;
+       afi->channels = channels;
+       afi->frequency = rate;
+       ret = (afi->chunk_table[afi->chunks_total] - afi->chunk_table[0]) * 8; /* bits */
+       ret += (channels * afi->seconds_total * 500); /* avoid rounding error */
+       afi->bitrate = ret / (channels * afi->seconds_total * 1000);
+       sprintf(afi->info_string, "audio_file_info1:%lu x %lums, "
+               "%uHz, %d channel%s, %ukb/s\n"
+               "audio_file_info2:\n"
+               "audio_file_info3:\n",
+               afi->chunks_total, tv2ms(&afi->chunk_tv),
+               afi->frequency, channels, channels == 1? "" : "s", afi->bitrate
+       );
+       tv_scale(20, &afi->chunk_tv, &afi->eof_tv);
+       ret = 1;
+out:
        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;
 }