#include <mp4v2/mp4v2.h>
#include "para.h"
+#include <mp4ff.h>
#include "error.h"
#include "portable_io.h"
#include "afh.h"
#include "aac.h"
#include "fd.h"
+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, off_t *skip)
{
int i;
PARA_DEBUG_LOG("found stsz@%d\n", i);
i += 8;
sample_size = read_u32_be(buf + i);
- PARA_DEBUG_LOG("sample size: %d\n", sample_size);
+ PARA_DEBUG_LOG("sample size: %u\n", sample_size);
i += 4;
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;
}
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);
afhi->chunk_table[0] = ret;
for (i = 1; i<= afhi->chunks_total; i++)
afhi->chunk_table[i] += ret;
+ set_max_chunk_size(afhi);
afhi->channels = channels;
afhi->frequency = rate;
ret = (afhi->chunk_table[afhi->chunks_total] - afhi->chunk_table[0]) * 8; /* bits */
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;
}