- if (!padd->initialized) {
- unsigned long rate = 0;
- unsigned char channels = 0;
- ret = aac_find_esds(inbuf, len, &skip, &padd->decoder_length);
- if (ret < 0) {
- PARA_INFO_LOG("%s\n", para_strerror(-ret));
- ret = NeAACDecInit(padd->handle, inbuf,
- len, &rate, &channels);
- PARA_INFO_LOG("decoder init: %d\n", ret);
- if (ret < 0) {
- ret = -E_AACDEC_INIT;
- goto out;
- }
- consumed = ret;
- } else {
- PARA_INFO_LOG("decoder len: %lu\n",
- padd->decoder_length);
- consumed += skip;
- p = inbuf + consumed;
- ret = -E_AACDEC_INIT;
- if (NeAACDecInit2(padd->handle, p,
- padd->decoder_length, &rate,
- &channels) < 0)
- goto out;
- }
- fc->samplerate = rate;
- fc->channels = channels;
- PARA_INFO_LOG("rate: %u, channels: %d\n",
- fc->samplerate, fc->channels);
- padd->initialized = 1;
- }
- if (padd->decoder_length > 0) {
- consumed = 0;
- if (!padd->entry) {
- ret = aac_find_entry_point(inbuf + consumed,
- len - consumed, &skip);
- if (ret < 0) {
- ret = len;
- goto out;
- }
- consumed += skip;
- padd->entry = ret;
- PARA_INFO_LOG("entry: %zu\n", padd->entry);
- }
- ret = len;
- if (padd->consumed_total + len < padd->entry)
- goto out;
- if (padd->consumed_total < padd->entry)
- consumed = padd->entry - padd->consumed_total;
- }
- for (; consumed < len; consumed++)
- if ((inbuf[consumed] & 0xfe) == 0x20)
- break;
- if (consumed >= len)
- goto success;
- p = inbuf + consumed;
- outbuffer = NeAACDecDecode(padd->handle, &padd->frame_info, p,
- len - consumed);
- if (padd->frame_info.error) {
- ret = -E_AAC_DECODE;
- if (padd->error_count++ > MAX_ERRORS)
- goto out;
- PARA_ERROR_LOG("frame_error: %d, consumed: %zu + %zd + %lu\n",
- padd->frame_info.error, padd->consumed_total,
- consumed, padd->frame_info.bytesconsumed);
- PARA_ERROR_LOG("%s\n", NeAACDecGetErrorMessage(
- padd->frame_info.error));
- consumed++; /* catch 21 */
- goto success;
+static unsigned long aac_read_decoder_length(char *buf, int *description_len)
+{
+ uint8_t b;
+ uint8_t numBytes = 0;
+ unsigned long length = 0;
+
+ do {
+ b = buf[numBytes];
+ numBytes++;
+ length = (length << 7) | (b & 0x7F);
+ } while
+ ((b & 0x80) && numBytes < 4);
+ *description_len = numBytes;
+ return length;
+}
+
+/*
+ * Search for the position and the length of the decoder configuration.
+ *
+ * \param buf Buffer to seach.
+ * \param buflen Length of \a buf.
+ * \param skip Upon succesful return, this contains the offset in \a buf where
+ * the decoder config starts.
+ * \param decoder_length Result pointer that is filled in with the length of
+ * the decoder configuration on success.
+ *
+ * \return Standard.
+ */
+static int aac_find_esds(char *buf, size_t buflen, size_t *skip,
+ unsigned long *decoder_length)
+{
+ size_t i;
+
+ for (i = 0; i + 4 < buflen; i++) {
+ char *p = buf + i;
+ int description_len;
+
+ if (p[0] != 'e' || p[1] != 's' || p[2] != 'd' || p[3] != 's')
+ continue;
+ i += 8;
+ p = buf + i;
+ PARA_INFO_LOG("found esds@%zu, next: %x\n", i, *p);
+ if (*p == 3)
+ i += 8;
+ else
+ i += 6;
+ p = buf + i;
+ PARA_INFO_LOG("next: %x\n", *p);
+ if (*p != 4)
+ continue;
+ i += 18;
+ p = buf + i;
+ PARA_INFO_LOG("next: %x\n", *p);
+ if (*p != 5)
+ continue;
+ i++;
+ p = buf + i;
+ *decoder_length = aac_read_decoder_length(p, &description_len);
+ PARA_INFO_LOG("decoder length: %lu\n", *decoder_length);
+ i += description_len;
+ *skip = i;
+ return 1;