Merge branch 'master' into next
[paraslash.git] / aac_afh.c
index 9cab392..0446117 100644 (file)
--- a/aac_afh.c
+++ b/aac_afh.c
 /*
- * Copyright (C) 2006 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2006-2008 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 */
 
+#include <osl.h>
 
-#include "server.cmdline.h"
-#include "server.h"
-#include "afs.h"
+#include "para.h"
 #include "error.h"
+#include "afh.h"
 #include "string.h"
 #include "aac.h"
 
-/* must be big enough to hold header */
-#define DEFAULT_INBUF_SIZE 65536
+static int aac_find_stsz(unsigned char *buf, size_t buflen, off_t *skip)
+{
+       int i;
 
-static FILE *infile;
-static int inbuf_size;
-static unsigned char *inbuf;
-static unsigned inbuf_len;
-struct audio_format *af;
+       for (i = 0; i + 16 < buflen; i++) {
+               unsigned char *p = buf + i;
+               unsigned sample_count, sample_size;
 
-static unsigned num_chunks, entry;
+               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;
+}
 
-static size_t *chunk_table;
-NeAACDecHandle handle;
+static int atom_cmp(unsigned char *buf1, char *buf2)
+{
+       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 void aac_close_audio_file(void)
+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 int read_stsz(unsigned skip)
+static char *get_tag(unsigned char *p, int size)
 {
-       int ret, i;
-       long unsigned sum = 0;
+       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;
+}
 
-       for (;;) {
-               ret = aac_find_stsz(inbuf, inbuf_len, &skip);
-               if (ret >= 0)
+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;
+
+               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, inbuf_size);
-               if (ret <= 0)
-                       return -E_AAC_READ;
-               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;
        }
-       num_chunks = ret;
-       PARA_INFO_LOG("sz table has %d entries\n", num_chunks);
-       free(chunk_table);
-       chunk_table = para_malloc(num_chunks * sizeof(size_t));
-       for (i = 0; i < num_chunks; i++) {
-               if (skip + 4 > inbuf_len) {
-                       skip = inbuf_len - skip;
-                       memmove(inbuf, inbuf + inbuf_len - skip, skip);
-                       ret = read(fileno(infile), inbuf + skip, inbuf_size - skip);
-                       if (ret <= 0)
-                               return -E_AAC_READ;
-                       inbuf_len = ret + skip;
-                       skip = 0;
-                       PARA_INFO_LOG("next buffer: %d 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);
-               chunk_table[i] = sum;
-               skip += 4;
-               if (i < 10 || i > num_chunks - 10)
-                       PARA_DEBUG_LOG("offset #%d: %d\n", i, chunk_table[i]);
+               p += 4;
+               return read_tags(p, buflen - (p - buf), afhi);
        }
-       return 1;
-
 }
 
+static void aac_get_taginfo(unsigned char *buf, size_t buflen,
+               struct afh_info *afhi)
+{
+       int i;
+       uint64_t subsize;
+       unsigned char type[5];
 
-/*
- * 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)
+       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, skip, decoder_len;
-       unsigned long rate = 0;
-       unsigned char channels = 0;
-       mp4AudioSpecificConfig mp4ASC;
+       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,
-               decoder_len, &rate, &channels);
-       if (ret < 0)
-               return -E_AACDEC_INIT;
-       skip += ret;
-       PARA_INFO_LOG("rate: %lu, channels: %d\n", rate, channels);
-       ret = NeAACDecAudioSpecificConfig(inbuf + skip, inbuf_len - skip, &mp4ASC);
-       if (ret >= 0) {
-               PARA_DEBUG_LOG("mp4ASC.samplingFrequency: %lu\n",
-                       mp4ASC.samplingFrequency);
-       } else
-               PARA_WARNING_LOG("no mp4ASC %s\n", "");
-
-       ret = read_stsz(skip);
-       if (ret < 0)
-               return ret;
-       for (;;) {
-               ret = aac_find_stco(inbuf, inbuf_len, &skip);
-               if (ret >= 0)
+       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;
-               ret = read(fileno(infile), inbuf, inbuf_size);
-               if (ret <= 0)
-                       return -E_AAC_READ;
-               PARA_INFO_LOG("next buffer: %d bytes\n", ret);
-       }
-       *frames = ret;
-       entry = aac_read_int32(inbuf + skip);
-       PARA_INFO_LOG("offset table has %d entries\, entry: %zd\n", num_chunks,
-               entry);
-#if 1
-       sprintf(info_str, "audio_file_info1:%d x %lums\n"
-               "audio_file_info2:\n"
-               "audio_file_info3:\n",
-               num_chunks,
-               tv2ms(&af->chunk_tv));
-#endif
-#if 1
-       {
-       struct timeval total_tv;
-       tv_scale(num_chunks, &af->chunk_tv, &total_tv);
-       *seconds = tv2ms(&total_tv) / 1000;
-       PARA_INFO_LOG("%d seconds, %d chunks\n", *seconds, num_chunks);
+               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]);
        }
-#endif
-       return 1;
+       return skip;
 }
 
-/*
- * Simple stream reposition routine
- */
-static int aac_reposition_stream(long unsigned request)
+static int aac_set_chunk_tv(struct afh_info *afhi,
+               mp4AudioSpecificConfig *mp4ASC, long unsigned *seconds)
 {
-       return -E_AAC_REPOS;
-}
+       float tmp = mp4ASC->sbr_present_flag == 1? 2047 : 1023;
+       struct timeval total;
+       long unsigned ms = 1000.0 * afhi->chunks_total * tmp
+               / mp4ASC->samplingFrequency;
 
-static __must_check int para_fread(void *ptr, size_t size, size_t nmemb, FILE *stream)
-{
-       size_t res = fread(ptr, size, nmemb, stream);
-       if (res == nmemb)
-               return size * nmemb;
-       if (feof(stream))
-               return 0;
-       return -E_FREAD;
+       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;
 }
 
-char *aac_read_chunk(long unsigned current_chunk, ssize_t *len)
+/*
+ * Init m4a file and write some tech data to given pointers.
+ */
+static int aac_get_file_info(char *map, size_t numbytes, __a_unused int fd,
+               struct afh_info *afhi)
 {
-       int ret;
-       size_t pos;
-
-       *len = 0;
-       if (current_chunk >= num_chunks)
-               return NULL;
-       if (!current_chunk) {
-               *len = entry;
-               pos = 0;
-       } else if (current_chunk == 1) {
-               *len = chunk_table[0];
-               pos = entry;
-       } else {
-               *len = chunk_table[current_chunk - 1] - chunk_table[current_chunk - 2];
-               pos = entry + chunk_table[current_chunk - 2];
-       }
-       if (inbuf_size < *len) {
-               inbuf = para_realloc(inbuf, *len);
-               inbuf_size = *len;
-       }
-//     PARA_DEBUG_LOG("reading chunk #%lu@%zd (%zd bytes)\n", current_chunk,
-//             pos, *len);
-       ret = fseek(infile, pos, SEEK_SET);
+       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;
+
+       ret = aac_find_esds(umap, numbytes, &skip, &decoder_len);
+       if (ret < 0)
+               goto out;
+       aac_get_taginfo(umap, numbytes, afhi);
+       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)
-               return NULL;
-       ret = para_fread(inbuf, *len, 1, infile);
-       if (ret != *len)
-               return NULL;
-//     PARA_DEBUG_LOG("ret: %d, inbuf[0]: %lx - %lx\n", ret, (long unsigned) inbuf[0],
-//             (long unsigned) inbuf[4]);
-       return (char *)inbuf;
+               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);
+       ret = 1;
+out:
+       if (handle)
+               NeAACDecClose(handle);
+       return ret;
 }
 
-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 = 23120;
-       tv_scale(3, &af->chunk_tv, &af->eof_tv);
+       afh->get_file_info = aac_get_file_info,
+       afh->suffixes = aac_suffixes;
 }