X-Git-Url: http://git.tuebingen.mpg.de/?a=blobdiff_plain;f=aac_afh.c;h=0a80bfcf3a44205ea7d42f9ac260c03f910ba199;hb=d440a71683940a58747de6dc32643db452d9cf54;hp=be301c5ce38f530bf29ddef4781f89c4d2b4926b;hpb=471684761a2039bbc89aa1e3c33c62de6bef86cf;p=paraslash.git

diff --git a/aac_afh.c b/aac_afh.c
index be301c5c..0a80bfcf 100644
--- a/aac_afh.c
+++ b/aac_afh.c
@@ -1,160 +1,260 @@
-/*
- * Copyright (C) 2006-2007 Andre Noll <maan@systemlinux.org>
- *
- * Licensed under the GPL v2. For licencing details see COPYING.
- */
+/* Copyright (C) 2006 Andre Noll <maan@tuebingen.mpg.de>, see file 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 <regex.h>
+#include <neaacdec.h>
 
-#include "server.h"
+#include "para.h"
+#include "mp4.h"
 #include "error.h"
+#include "portable_io.h"
+#include "afh.h"
 #include "string.h"
-#include "aac.h"
+#include "fd.h"
 
-static int aac_find_stsz(unsigned char *buf, size_t buflen, off_t *skip)
+
+struct aac_afh_context {
+	const void *map;
+	size_t mapsize;
+	size_t fpos;
+	struct mp4 *mp4;
+	struct mp4_callback cb;
+};
+
+static ssize_t aac_afh_read_cb(void *user_data, void *dest, size_t want)
 {
-	int i;
+	struct aac_afh_context *c = user_data;
+	size_t have, rv;
 
-	for (i = 0; i + 16 < buflen; i++) {
-		unsigned char *p = buf + i;
-		unsigned sample_count, sample_size;
+	if (want == 0 || c->fpos >= c->mapsize)
+		return 0;
+	have = c->mapsize - c->fpos;
+	rv = PARA_MIN(have, want);
+	PARA_DEBUG_LOG("reading %zu bytes @%zu\n", rv, c->fpos);
+	memcpy(dest, c->map + c->fpos, rv);
+	c->fpos += rv;
+	return rv;
+}
 
-		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;
+static uint32_t aac_afh_seek_cb(void *user_data, uint64_t pos)
+{
+	struct aac_afh_context *c = user_data;
+	c->fpos = pos;
+	return 0;
 }
 
-static ssize_t aac_compute_chunk_table(struct audio_format_info *afi,
-		unsigned char *map, size_t numbytes)
+static int aac_afh_open(const void *map, size_t mapsize, void **afh_context)
 {
-	int ret, i;
-	size_t sum = 0;
-	off_t skip;
+	int ret;
+	struct aac_afh_context *c = para_malloc(sizeof(*c));
 
-	ret = aac_find_stsz(map, numbytes, &skip);
+	c->map = map;
+	c->mapsize = mapsize;
+	c->fpos = 0;
+	c->cb.read = aac_afh_read_cb;
+	c->cb.seek = aac_afh_seek_cb;
+	c->cb.user_data = c;
+
+	ret = mp4_open_read(&c->cb, &c->mp4);
 	if (ret < 0)
-		return ret;
-	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;
+		goto free_ctx;
+	*afh_context = c;
+	return 0;
+free_ctx:
+	free(c);
+	*afh_context = NULL;
+	return ret;
+}
+
+static void aac_afh_close(void *afh_context)
+{
+	struct aac_afh_context *c = afh_context;
+	mp4_close(c->mp4);
+	free(c);
 }
 
-static int aac_set_chunk_tv(struct audio_format_info *afi,
-		mp4AudioSpecificConfig *mp4ASC, long unsigned *seconds)
+static int aac_afh_get_chunk(uint32_t chunk_num, void *afh_context,
+		const char **buf, uint32_t *len)
 {
-	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;
+	struct aac_afh_context *c = afh_context;
+	int32_t ss;
+	size_t offset;
+	int ret;
+
+	ret = mp4_set_sample_position(c->mp4, chunk_num);
+	if (ret < 0)
+		return ret;
+	offset = c->fpos;
+	ss = mp4_get_sample_size(c->mp4, chunk_num);
+	if (ss <= 0)
+		return -E_MP4_BAD_SAMPLE;
+	assert(ss + offset <= c->mapsize);
+	*buf = c->map + offset;
+	*len = ss;
 	return 1;
 }
 
+static void _aac_afh_get_taginfo(const struct mp4 *mp4, struct taginfo *tags)
+{
+	tags->artist = mp4_meta_get_artist(mp4);
+	tags->title = mp4_meta_get_title(mp4);
+	tags->year = mp4_meta_get_date(mp4);
+	tags->album = mp4_meta_get_album(mp4);
+	tags->comment = mp4_meta_get_comment(mp4);
+}
+
 /*
  * Init m4a file and write some tech data to given pointers.
  */
-static int aac_get_file_info(char *map, size_t numbytes,
-		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;
-	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;
-
-	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);
+	int ret;
+	int32_t rv;
+	struct aac_afh_context *c;
+	uint64_t milliseconds;
+	const char *buf;
+	uint32_t n, len;
+
+	ret = aac_afh_open(map, numbytes, (void **)&c);
 	if (ret < 0)
-		goto out;
-	skip = ret;
-	ret = aac_set_chunk_tv(afi, &mp4ASC, &afi->seconds_total);
+		return ret;
+
+	ret = -E_MP4_BAD_SAMPLERATE;
+	rv = mp4_get_sample_rate(c->mp4);
+	if (rv <= 0)
+		goto close;
+	afhi->frequency = rv;
+
+	ret = -E_MP4_BAD_CHANNEL_COUNT;
+	rv = mp4_get_channel_count(c->mp4);
+	if (rv <= 0)
+		goto close;
+	afhi->channels = rv;
+
+	ret = -E_MP4_BAD_SAMPLE_COUNT;
+	rv = mp4_num_samples(c->mp4);
+	if (rv <= 0)
+		goto close;
+	afhi->chunks_total = rv;
+	afhi->max_chunk_size = 0;
+	for (n = 0; n < afhi->chunks_total; n++) {
+		if (aac_afh_get_chunk(n, c, &buf, &len) < 0)
+			break;
+		afhi->max_chunk_size = PARA_MAX(afhi->max_chunk_size, len);
+	}
+	milliseconds = mp4_get_duration(c->mp4);
+	afhi->seconds_total = milliseconds / 1000;
+	ms2tv(milliseconds / afhi->chunks_total, &afhi->chunk_tv);
+	if (aac_afh_get_chunk(0, c, &buf, &len) >= 0)
+		numbytes -= buf - map;
+	afhi->bitrate = 8 * numbytes / afhi->seconds_total / 1000;
+	_aac_afh_get_taginfo(c->mp4, &afhi->tags);
+	ret = 1;
+close:
+	aac_afh_close(c);
+	return ret;
+}
+
+static ssize_t aac_afh_meta_read_cb(void *user_data, void *dest, size_t want)
+{
+	int fd = *(int *)user_data;
+	return read(fd, dest, want);
+}
+
+static uint32_t aac_afh_meta_seek_cb(void *user_data, uint64_t pos)
+{
+	int fd = *(int *)user_data;
+	return lseek(fd, pos, SEEK_SET);
+}
+
+static ssize_t aac_afh_meta_write_cb(void *user_data, void *dest, size_t count)
+{
+	int fd = *(int *)user_data;
+	return write(fd, dest, count);
+}
+
+static uint32_t aac_afh_meta_truncate_cb(void *user_data)
+{
+	int fd = *(int *)user_data;
+	off_t offset = lseek(fd, 0, SEEK_CUR);
+	return ftruncate(fd, offset);
+}
+
+static void replace_or_add_tag(const char *item, const char *value,
+		struct mp4_metadata *meta)
+{
+	uint32_t n;
+	struct mp4_tag *t;
+
+	for (n = 0; n < meta->count; n++) {
+		t = meta->tags + n;
+		if (strcasecmp(t->item, item))
+			continue;
+		free(t->value);
+		t->value = para_strdup(value);
+		return;
+	}
+	/* item not found, add new tag */
+	meta->tags = para_realloc(meta->tags, (meta->count + 1)
+		* sizeof(struct mp4_tag));
+	t = meta->tags + meta->count;
+	t->item = para_strdup(item);
+	t->value = para_strdup(value);
+	meta->count++;
+}
+
+static int aac_afh_rewrite_tags(const char *map, size_t mapsize,
+		struct taginfo *tags, int fd, __a_unused const char *filename)
+{
+	int ret;
+	struct mp4_metadata *metadata;
+	struct mp4 *mp4;
+	struct mp4_callback cb = {
+		.read = aac_afh_meta_read_cb,
+		.seek = aac_afh_meta_seek_cb,
+		.write = aac_afh_meta_write_cb,
+		.truncate = aac_afh_meta_truncate_cb,
+		.user_data = &fd
+	};
+
+	ret = write_all(fd, map, mapsize);
 	if (ret < 0)
-		goto out;
-	ret = aac_find_entry_point(umap + skip, numbytes - skip, &skip);
+		return ret;
+	lseek(fd, 0, SEEK_SET);
+
+	ret = mp4_open_meta(&cb, &mp4);
 	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;
+	metadata = mp4_get_meta(mp4);
+	PARA_NOTICE_LOG("%u metadata item(s) found\n", metadata->count);
+	replace_or_add_tag("artist", tags->artist, metadata);
+	replace_or_add_tag("title", tags->title, metadata);
+	replace_or_add_tag("album", tags->album, metadata);
+	replace_or_add_tag("date", tags->year, metadata);
+	replace_or_add_tag("comment", tags->comment, metadata);
+	ret = mp4_meta_update(mp4);
+	mp4_close(mp4);
 	return ret;
 }
 
-static const char* aac_suffixes[] = {"m4a", "mp4", NULL};
+static const char * const aac_suffixes[] = {"m4a", "mp4", NULL};
+
 /**
- * the init function of the aac audio format handler
+ * The audio format handler for the Advanced Audio Codec.
  *
- * \param afh pointer to the struct to initialize
+ * This is only compiled in if the faad library is installed.
  */
-void aac_afh_init(struct audio_format_handler *afh)
-{
-	afh->get_file_info = aac_get_file_info,
-	afh->suffixes = aac_suffixes;
-}
+const struct audio_format_handler aac_afh = {
+	.get_file_info = aac_get_file_info,
+	.suffixes = aac_suffixes,
+	.rewrite_tags = aac_afh_rewrite_tags,
+	.open = aac_afh_open,
+	.get_chunk = aac_afh_get_chunk,
+	.close = aac_afh_close,
+};