X-Git-Url: http://git.tuebingen.mpg.de/?a=blobdiff_plain;f=aac_afh.c;h=b555244b1ef27bcd6d0d8ee3a62ee256adefd16b;hb=6a0cd05bad7cb1fb166c54aaa8f04927e40baa68;hp=d3e694548a3dbfaf08e40eb5cd8ba01bc10af7cf;hpb=6aad8ed5fef24cdf2c65cbb193572cb10c2b2c1c;p=paraslash.git

diff --git a/aac_afh.c b/aac_afh.c
index d3e69454..b555244b 100644
--- a/aac_afh.c
+++ b/aac_afh.c
@@ -14,45 +14,173 @@
 #include <mp4v2/mp4v2.h>
 
 #include "para.h"
+#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)
+{
+	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;
+	}
+	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 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 int32_t aac_afh_get_track(mp4ff_t *mp4ff, mp4AudioSpecificConfig *masc)
+{
+	int32_t i, rc, num_tracks = mp4ff_total_tracks(mp4ff);
+
+	assert(num_tracks >= 0);
+	for (i = 0; i < num_tracks; i++) {
+		unsigned char *buf = NULL;
+		unsigned buf_size = 0;
+
+		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;
+		}
+	}
+	return -1; /* no audio track */
+}
+
+static int aac_afh_open(const void *map, size_t mapsize, void **afh_context)
+{
+	int ret;
+	struct aac_afh_context *c = para_malloc(sizeof(*c));
+
+	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 = -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 aac_afh_close(void *afh_context)
+{
+	struct aac_afh_context *c = afh_context;
+	mp4ff_close(c->mp4ff);
+	free(c);
+}
+
+/**
+ * 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);
+
+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;
+
+	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 int aac_find_stsz(char *buf, size_t buflen, size_t *skip)
 {
 	int i;
 
 	for (i = 0; i + 16 < buflen; i++) {
-		unsigned char *p = buf + i;
+		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);
+		sample_size = read_u32_be(buf + i);
+		PARA_DEBUG_LOG("sample size: %u\n", sample_size);
 		i += 4;
-		sample_count = aac_read_int32(buf + i);
+		sample_count = read_u32_be(buf + i);
 		i += 4;
-		PARA_DEBUG_LOG("sample count: %d\n", sample_count);
+		PARA_DEBUG_LOG("sample count: %u\n", sample_count);
 		*skip = i;
 		return sample_count;
 	}
 	return -E_STSZ;
 }
 
-static int atom_cmp(const unsigned char *buf1, const char *buf2)
+static int atom_cmp(const char *buf1, const char *buf2)
 {
 	return memcmp(buf1, buf2, 4)? 1 : 0;
 }
 
-static int read_atom_header(unsigned char *buf, uint64_t *subsize, unsigned char type[5])
+static int read_atom_header(char *buf, uint64_t *subsize, char type[5])
 {
-	int i;
-	uint64_t size = aac_read_int32(buf);
+	uint64_t size = read_u32_be(buf);
 
 	memcpy(type, buf + 4, 4);
 	type[4] = '\0';
@@ -64,13 +192,12 @@ static int read_atom_header(unsigned char *buf, uint64_t *subsize, unsigned char
 	}
 	buf += 4;
 	size = 0;
-	for (i = 0; i < 8; i++)
-		size |= ((uint64_t)buf[i]) << ((7 - i) * 8);
+	size = read_u64_be(buf);
 	*subsize = size;
 	return 16;
 }
 
-static char *get_tag(unsigned char *p, int size)
+static char *get_tag(char *p, int size)
 {
 	char *buf;
 
@@ -83,12 +210,12 @@ static char *get_tag(unsigned char *p, int size)
 	return buf;
 }
 
-static void read_tags(unsigned char *buf, size_t buflen, struct afh_info *afhi)
+static void read_tags(char *buf, size_t buflen, struct afh_info *afhi)
 {
-	unsigned char *p = buf;
+	char *p = buf;
 
 	while (p + 32 < buf + buflen) {
-		unsigned char *q, type1[5], type2[5];
+		char *q, type1[5], type2[5];
 		uint64_t size1, size2;
 		int ret, ret2;
 
@@ -117,9 +244,9 @@ static void read_tags(unsigned char *buf, size_t buflen, struct afh_info *afhi)
 	}
 }
 
-static void read_meta(unsigned char *buf, size_t buflen, struct afh_info *afhi)
+static void read_meta(char *buf, size_t buflen, struct afh_info *afhi)
 {
-	unsigned char *p = buf;
+	char *p = buf;
 
 	while (p + 4 < buf + buflen) {
 
@@ -132,15 +259,14 @@ static void read_meta(unsigned char *buf, size_t buflen, struct afh_info *afhi)
 	}
 }
 
-static void aac_get_taginfo(unsigned char *buf, size_t buflen,
-		struct afh_info *afhi)
+static void aac_get_taginfo(char *buf, size_t buflen, struct afh_info *afhi)
 {
 	int i;
 	uint64_t subsize;
-	unsigned char type[5];
+	char type[5];
 
 	for (i = 0; i + 24 < buflen; i++) {
-		unsigned char *p = buf + i;
+		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);
@@ -153,40 +279,31 @@ static void aac_get_taginfo(unsigned char *buf, size_t buflen,
 	PARA_INFO_LOG("no meta data\n");
 }
 
-static ssize_t aac_compute_chunk_table(struct afh_info *afhi,
-		unsigned char *map, size_t numbytes)
+static ssize_t aac_compute_chunk_info(struct afh_info *afhi,
+		char *map, size_t numbytes, mp4AudioSpecificConfig *mp4ASC)
 {
 	int ret, i;
-	size_t sum = 0;
-	off_t skip;
+	size_t skip;
+	float tmp = mp4ASC->sbr_present_flag == 1? 2047 : 1023;
+	struct timeval total;
+	long unsigned ms;
 
+	afhi->chunk_table = NULL;
 	ret = aac_find_stsz(map, numbytes, &skip);
 	if (ret < 0)
 		return ret;
 	afhi->chunks_total = ret;
+	afhi->max_chunk_size = 0;
 	PARA_DEBUG_LOG("sz table has %" PRIu32 " 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++) {
+		uint32_t val;
 		if (skip + 4 > numbytes)
 			break;
-		sum += aac_read_int32(map + skip);
-		afhi->chunk_table[i] = sum;
+		val = read_u32_be(map + skip);
+		afhi->max_chunk_size = PARA_MAX(afhi->max_chunk_size, val);
 		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, uint32_t *seconds)
-{
-	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);
@@ -195,7 +312,13 @@ static int aac_set_chunk_tv(struct afh_info *afhi,
 		afhi->chunks_total, tv2ms(&afhi->chunk_tv));
 	if (ms < 1000)
 		return -E_MP4ASC;
-	*seconds = ms / 1000;
+	afhi->seconds_total = ms / 1000;
+	ret = aac_find_entry_point(map, numbytes, &skip);
+	if (ret < 0)
+		return ret;
+	ret = (numbytes - ret) * 8;
+	ret += (afhi->channels * afhi->seconds_total * 500); /* avoid rounding error */
+	afhi->bitrate = ret / (afhi->channels * afhi->seconds_total * 1000);
 	return 1;
 }
 
@@ -205,49 +328,36 @@ static int aac_set_chunk_tv(struct afh_info *afhi,
 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 = NULL;
-	unsigned char *umap = (unsigned char *) map;
 
-	ret = aac_find_esds(umap, numbytes, &skip, &decoder_len);
+	ret = aac_find_esds(map, numbytes, &skip, &decoder_len);
 	if (ret < 0)
 		goto out;
-	aac_get_taginfo(umap, numbytes, afhi);
+	aac_get_taginfo(map, numbytes, afhi);
 	handle = aac_open();
 	ret = -E_AAC_AFH_INIT;
-	if (NeAACDecInit(handle, umap + skip, decoder_len, &rate, &channels))
+	if (NeAACDecInit(handle, (unsigned char *)map + skip, decoder_len,
+			&rate, &channels))
 		goto out;
 	if (!channels)
 		goto out;
+	afhi->channels = channels;
+	afhi->frequency = rate;
 	PARA_DEBUG_LOG("rate: %lu, channels: %d\n", rate, channels);
 	ret = -E_MP4ASC;
-	if (NeAACDecAudioSpecificConfig(umap + skip, numbytes - skip, &mp4ASC))
+	if (NeAACDecAudioSpecificConfig((unsigned char *)map + skip,
+			numbytes - skip, &mp4ASC))
 		goto out;
 	if (!mp4ASC.samplingFrequency)
 		goto out;
-	ret = aac_compute_chunk_table(afhi, umap, numbytes);
+	ret = aac_compute_chunk_info(afhi, map, numbytes, &mp4ASC);
 	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);
 	ret = 1;
 out:
 	if (handle)
@@ -317,7 +427,7 @@ close:
 	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
  *
@@ -328,4 +438,7 @@ 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_rewrite_tags;
+	afh->open = aac_afh_open;
+	afh->get_chunk = aac_afh_get_chunk;
+	afh->close = aac_afh_close;
 }