X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=aac_afh.c;h=3315a42d57a5ea9673be88b077daef1275ab49f6;hp=7acb011df165a09a9536a850e7b736dbfa7b9eec;hb=a4c2c4f9c7cd580252917729a65d482de3c14a97;hpb=a5ad3d4c598bafe28e90e5b623e0a754d6e973d5

diff --git a/aac_afh.c b/aac_afh.c
index 7acb011d..3315a42d 100644
--- a/aac_afh.c
+++ b/aac_afh.c
@@ -1,269 +1,338 @@
-/*
- * Copyright (C) 2006-2011 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 "para.h"
+
+/* To get the mp4ff_tag_t and mp4ff_metadata_t typedefs. */
+#define USE_TAGGING
+#include <mp4ff.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;
+	int32_t track;
+	mp4ff_t *mp4ff;
+	mp4AudioSpecificConfig masc;
+	mp4ff_callback_t cb;
+};
+
+static uint32_t aac_afh_read_cb(void *user_data, void *dest, uint32_t want)
 {
-	int i;
-
-	for (i = 0; i + 16 < buflen; i++) {
-		unsigned char *p = buf + i;
-		unsigned sample_count, sample_size;
-
-		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;
+	struct aac_afh_context *c = user_data;
+	uint32_t have, rv;
+
+	if (want == 0 || c->fpos >= c->mapsize) {
+		PARA_INFO_LOG("failed attempt to read %u bytes @%zu\n", want,
+			c->fpos);
+		errno = EAGAIN;
+		return -1;
 	}
-	return -E_STSZ;
+	have = c->mapsize - c->fpos;
+	rv = PARA_MIN(have, want);
+	PARA_DEBUG_LOG("reading %u bytes @%zu\n", rv, c->fpos);
+	memcpy(dest, c->map + c->fpos, rv);
+	c->fpos += rv;
+	return rv;
 }
 
-static int atom_cmp(const unsigned char *buf1, const char *buf2)
+static uint32_t aac_afh_seek_cb(void *user_data, uint64_t pos)
 {
-	const 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;
+	struct aac_afh_context *c = user_data;
+	c->fpos = pos;
 	return 0;
 }
 
-static int read_atom_header(unsigned char *buf, uint64_t *subsize, unsigned char type[5])
+static int32_t aac_afh_get_track(mp4ff_t *mp4ff, mp4AudioSpecificConfig *masc)
 {
-	int i;
-	uint64_t size = (buf[0] << 24) + (buf[1] << 16) + (buf[2] << 8) + buf[3];
+	int32_t i, rc, num_tracks = mp4ff_total_tracks(mp4ff);
 
-	memcpy(type, buf + 4, 4);
-	type[4] = '\0';
+	assert(num_tracks >= 0);
+	for (i = 0; i < num_tracks; i++) {
+		unsigned char *buf = NULL;
+		unsigned buf_size = 0;
 
-	PARA_DEBUG_LOG("size: %llu, type: %s\n", (long long unsigned)size, type);
-	if (size != 1) {
-		*subsize = size;
-		return 8;
+		mp4ff_get_decoder_config(mp4ff, i, &buf, &buf_size);
+		if (buf) {
+			rc = NeAACDecAudioSpecificConfig(buf, buf_size, masc);
+			free(buf);
+			if (rc < 0)
+				continue;
+			return i;
+		}
 	}
-	buf += 4;
-	size = 0;
-	for (i = 0; i < 8; i++)
-		size |= ((uint64_t)buf[i]) << ((7 - i) * 8);
-	*subsize = size;
-	return 16;
+	return -1; /* no audio track */
 }
 
-static char *get_tag(unsigned char *p, int size)
+static int aac_afh_open(const void *map, size_t mapsize, void **afh_context)
 {
-	char *buf;
+	int ret;
+	struct aac_afh_context *c = para_malloc(sizeof(*c));
 
-	assert(size > 0);
-	buf = para_malloc(size + 1);
+	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;
 
-	memcpy(buf, p, size);
-	buf[size] = '\0';
-	PARA_DEBUG_LOG("size: %d: %s\n", size, buf);
-	return buf;
+	ret = -E_MP4FF_OPEN;
+	c->mp4ff = mp4ff_open_read(&c->cb);
+	if (!c->mp4ff)
+		goto free_ctx;
+	c->track = aac_afh_get_track(c->mp4ff, &c->masc);
+	ret = -E_MP4FF_TRACK;
+	if (c->track < 0)
+		goto close_mp4ff;
+	*afh_context = c;
+	return 0;
+close_mp4ff:
+	mp4ff_close(c->mp4ff);
+free_ctx:
+	free(c);
+	*afh_context = NULL;
+	return ret;
 }
 
-static void read_tags(unsigned char *buf, size_t buflen, struct afh_info *afhi)
+static void aac_afh_close(void *afh_context)
 {
-	unsigned char *p = buf;
+	struct aac_afh_context *c = afh_context;
+	mp4ff_close(c->mp4ff);
+	free(c);
+}
 
-	while (p + 32 < buf + buflen) {
-		unsigned char *q, type1[5], type2[5];
-		uint64_t size1, size2;
-		int ret, ret2;
+/**
+ * Libmp4ff function to reposition the file to the given sample.
+ *
+ * \param f The opaque handle returned by mp4ff_open_read().
+ * \param track The number of the (audio) track.
+ * \param sample Destination.
+ *
+ * We need this function to obtain the offset of the sample within the audio
+ * file. Unfortunately, it is not exposed in the mp4ff header.
+ *
+ * \return This function always returns 0.
+ */
+int32_t mp4ff_set_sample_position(mp4ff_t *f, const int32_t track, const int32_t sample);
 
-		ret = read_atom_header(p, &size1, type1);
-		ret2 = read_atom_header(p + ret, &size2, type2);
+static int aac_afh_get_chunk(long unsigned chunk_num, void *afh_context,
+		const char **buf, size_t *len)
+{
+	struct aac_afh_context *c = afh_context;
+	int32_t ss;
+	size_t offset;
 
-		if (size2 <= 16 || atom_cmp(type2, "data")) {
-			p += size1;
-			continue;
-		}
-		size2 -= 16;
-		q = p + ret + ret2 + 8;
-		if (q + size2 > buf + buflen)
-			break;
-		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;
-	}
+	assert(chunk_num <= INT_MAX);
+	/* this function always returns zero */
+	mp4ff_set_sample_position(c->mp4ff, c->track, chunk_num);
+	offset = c->fpos;
+	ss = mp4ff_read_sample_getsize(c->mp4ff, c->track, chunk_num);
+	if (ss <= 0)
+		return -E_MP4FF_BAD_SAMPLE;
+	assert(ss + offset <= c->mapsize);
+	*buf = c->map + offset;
+	*len = ss;
+	return 1;
 }
 
-static void read_meta(unsigned char *buf, size_t buflen, struct afh_info *afhi)
+static void _aac_afh_get_taginfo(const mp4ff_t *mp4ff, struct taginfo *tags)
+{
+	mp4ff_meta_get_artist(mp4ff, &tags->artist);
+	mp4ff_meta_get_title(mp4ff, &tags->title);
+	mp4ff_meta_get_date(mp4ff, &tags->year);
+	mp4ff_meta_get_album(mp4ff, &tags->album);
+	mp4ff_meta_get_comment(mp4ff, &tags->comment);
+}
+
+/*
+ * 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)
 {
-	unsigned char *p = buf;
+	int ret;
+	int32_t rv;
+	struct aac_afh_context *c;
+	int64_t tmp;
+	const char *buf;
+	size_t sz;
+	uint32_t n;
 
-	while (p + 4 < buf + buflen) {
+	ret = aac_afh_open(map, numbytes, (void **)&c);
+	if (ret < 0)
+		return ret;
 
-		if (p[0] != 'i' || p[1] != 'l' || p[2] != 's' || p[3] != 't') {
-			p++;
-			continue;
-		}
-		p += 4;
-		return read_tags(p, buflen - (p - buf), afhi);
+	ret = -E_MP4FF_BAD_SAMPLERATE;
+	rv = mp4ff_get_sample_rate(c->mp4ff, c->track);
+	if (rv <= 0)
+		goto close;
+	afhi->frequency = rv;
+
+	ret = -E_MP4FF_BAD_CHANNEL_COUNT;
+	rv = mp4ff_get_channel_count(c->mp4ff, c->track);
+	if (rv <= 0)
+		goto close;
+	afhi->channels = rv;
+
+	ret = -E_MP4FF_BAD_SAMPLE_COUNT;
+	rv = mp4ff_num_samples(c->mp4ff, c->track);
+	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, &sz) < 0)
+			break;
+		afhi->max_chunk_size = PARA_MAX((size_t)afhi->max_chunk_size, sz);
 	}
+
+	tmp = c->masc.sbr_present_flag == 1? 2048 : 1024;
+	afhi->seconds_total = tmp * afhi->chunks_total / afhi->frequency;
+	ms2tv(1000 * tmp / afhi->frequency, &afhi->chunk_tv);
+
+	if (aac_afh_get_chunk(0, c, &buf, &sz) >= 0)
+		numbytes -= buf - map;
+	afhi->bitrate = 8 * numbytes / afhi->seconds_total / 1000;
+	_aac_afh_get_taginfo(c->mp4ff, &afhi->tags);
+	ret = 1;
+close:
+	aac_afh_close(c);
+	return ret;
 }
 
-static void aac_get_taginfo(unsigned char *buf, size_t buflen,
-		struct afh_info *afhi)
+static uint32_t aac_afh_meta_read_cb(void *user_data, void *dest, uint32_t want)
 {
-	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");
+	int fd = *(int *)user_data;
+	return read(fd, dest, want);
 }
 
-static ssize_t aac_compute_chunk_table(struct afh_info *afhi,
-		unsigned char *map, size_t numbytes)
+static uint32_t aac_afh_meta_seek_cb(void *user_data, uint64_t pos)
 {
-	int ret, i;
-	size_t sum = 0;
-	off_t skip;
+	int fd = *(int *)user_data;
+	return lseek(fd, pos, SEEK_SET);
+}
 
-	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 > afhi->chunks_total)
-//			PARA_DEBUG_LOG("offset #%d: %zu\n", i, afhi->chunk_table[i]);
-	}
-	return skip;
+static uint32_t aac_afh_meta_write_cb(void *user_data, void *dest, uint32_t want)
+{
+	int fd = *(int *)user_data;
+	return write(fd, dest, want);
 }
 
-static int aac_set_chunk_tv(struct afh_info *afhi,
-		mp4AudioSpecificConfig *mp4ASC, long unsigned *seconds)
+static uint32_t aac_afh_meta_truncate_cb(void *user_data)
 {
-	float tmp = mp4ASC->sbr_present_flag == 1? 2047 : 1023;
-	struct timeval total;
-	long unsigned ms;
-
-	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;
+	int fd = *(int *)user_data;
+	off_t offset = lseek(fd, 0, SEEK_CUR);
+	return ftruncate(fd, offset);
 }
 
-/*
- * 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)
+static void replace_tag(mp4ff_tag_t *tag, const char *new_val, bool *found)
 {
-	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)
-		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);
+	free(tag->value);
+	tag->value = para_strdup(new_val);
+	*found = true;
+}
+
+static void add_tag(mp4ff_metadata_t *md, const char *item, const char *value)
+{
+	md->tags[md->count].item = para_strdup(item);
+	md->tags[md->count].value = para_strdup(value);
+	md->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, i;
+	int32_t rv;
+	mp4ff_metadata_t metadata;
+	mp4ff_t *mp4ff;
+	mp4ff_callback_t 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
+	};
+	bool found_artist = false, found_title = false, found_album = false,
+		found_year = false, found_comment = false;
+
+	ret = write_all(fd, map, mapsize);
 	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);
+		return ret;
+	lseek(fd, 0, SEEK_SET);
+
+	mp4ff = mp4ff_open_read_metaonly(&cb);
+	if (!mp4ff)
+		return -E_MP4FF_OPEN;
+
+	ret = -E_MP4FF_META_READ;
+	rv = mp4ff_meta_get_num_items(mp4ff);
+	if (rv < 0)
+		goto close;
+	metadata.count = rv;
+	PARA_NOTICE_LOG("%d metadata item(s) found\n", rv);
+
+	metadata.tags = para_malloc((metadata.count + 5) * sizeof(mp4ff_tag_t));
+	for (i = 0; i < metadata.count; i++) {
+		mp4ff_tag_t *tag = metadata.tags + i;
+
+		ret = -E_MP4FF_META_READ;
+		if (mp4ff_meta_get_by_index(mp4ff, i,
+				&tag->item, &tag->value) < 0)
+			goto free_tags;
+		PARA_INFO_LOG("found: %s: %s\n", tag->item, tag->value);
+		if (!strcmp(tag->item, "artist"))
+			replace_tag(tag, tags->artist, &found_artist);
+		else if (!strcmp(tag->item, "title"))
+			replace_tag(tag, tags->title, &found_title);
+		else if (!strcmp(tag->item, "album"))
+			replace_tag(tag, tags->album, &found_album);
+		else if (!strcmp(tag->item, "date"))
+			replace_tag(tag, tags->year, &found_year);
+		else if (!strcmp(tag->item, "comment"))
+			replace_tag(tag, tags->comment, &found_comment);
+	}
+	if (!found_artist)
+		add_tag(&metadata, "artist", tags->artist);
+	if (!found_title)
+		add_tag(&metadata, "title", tags->title);
+	if (!found_album)
+		add_tag(&metadata, "album", tags->album);
+	if (!found_year)
+		add_tag(&metadata, "date", tags->year);
+	if (!found_comment)
+		add_tag(&metadata, "comment", tags->comment);
+	ret = -E_MP4FF_META_WRITE;
+	if (mp4ff_meta_update(&cb, &metadata) < 0)
+		goto free_tags;
 	ret = 1;
-out:
-	if (handle)
-		NeAACDecClose(handle);
+free_tags:
+	for (; i > 0; i--) {
+		free(metadata.tags[i - 1].item);
+		free(metadata.tags[i - 1].value);
+	}
+	free(metadata.tags);
+close:
+	mp4ff_close(mp4ff);
 	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
  *
@@ -273,4 +342,8 @@ void aac_afh_init(struct audio_format_handler *afh)
 {
 	afh->get_file_info = aac_get_file_info,
 	afh->suffixes = aac_suffixes;
+	afh->rewrite_tags = aac_afh_rewrite_tags;
+	afh->open = aac_afh_open;
+	afh->get_chunk = aac_afh_get_chunk;
+	afh->close = aac_afh_close;
 }