(guint) header, (guint) header & HDRMASK, (guint) next_header,
(guint) next_header & HDRMASK, bpf);
*valid = FALSE;
- return TRUE;
+ goto cleanup;
- } else if ((((next_header >> 12) & 0xf) == 0) ||
- (((next_header >> 12) & 0xf) == 0xf)) {
+ } else if (((next_header >> 12) & 0xf) == 0xf) {
/* The essential parts were the same, but the bitrate held an
invalid value - also reject */
GST_DEBUG_OBJECT (mp3parse, "next header invalid (bitrate)");
return TRUE;
}
-static gboolean
-gst_mpeg_audio_parse_check_valid_frame (GstBaseParse * parse,
- GstBaseParseFrame * frame, guint * framesize, gint * skipsize)
+ /* Determines possible freeform frame rate/size by looking for next
+ * header with valid bitrate (0 or otherwise valid) (and sufficiently
+ * matching current header).
+ *
+ * Returns TRUE if we've found such one, and *rate then contains rate
+ * (or *rate contains 0 if decided no freeframe size could be determined).
+ * If not enough data, returns FALSE.
+ */
+ static gboolean
+ gst_mp3parse_find_freerate (GstMpegAudioParse * mp3parse, GstBuffer * buf,
+ guint32 header, gboolean at_eos, gint * _rate)
+ {
+ guint32 next_header;
+ const guint8 *data;
+ guint available;
+ int offset = 4;
+ gulong samplerate, rate, layer, padding;
+ gboolean valid;
+ gint lsf, mpg25;
+
+ available = GST_BUFFER_SIZE (buf);
+ data = GST_BUFFER_DATA (buf);
+
+ *_rate = 0;
+
+ /* pick apart header again partially */
+ if (header & (1 << 20)) {
+ lsf = (header & (1 << 19)) ? 0 : 1;
+ mpg25 = 0;
+ } else {
+ lsf = 1;
+ mpg25 = 1;
+ }
+ layer = 4 - ((header >> 17) & 0x3);
+ samplerate = (header >> 10) & 0x3;
+ samplerate = mp3types_freqs[lsf + mpg25][samplerate];
+ padding = (header >> 9) & 0x1;
+
+ for (; offset < available; ++offset) {
+ /* Check if we have enough data for all these frames, plus the next
+ frame header. */
+ if (available < offset + 4) {
+ if (at_eos) {
+ /* Running out of data; failed to determine size */
+ return TRUE;
+ } else {
+ return FALSE;
+ }
+ }
+
+ valid = FALSE;
+ next_header = GST_READ_UINT32_BE (data + offset);
+ if ((next_header & 0xFFE00000) != 0xFFE00000)
+ goto next;
+
+ GST_DEBUG_OBJECT (mp3parse, "At %d: header=%08X, header2=%08X",
+ offset, (unsigned int) header, (unsigned int) next_header);
+
+ if ((next_header & HDRMASK) != (header & HDRMASK)) {
+ /* If any of the unmasked bits don't match, then it's not valid */
+ GST_DEBUG_OBJECT (mp3parse, "next header doesn't match "
+ "(header=%08X (%08X), header2=%08X (%08X))",
+ (guint) header, (guint) header & HDRMASK, (guint) next_header,
+ (guint) next_header & HDRMASK);
+ goto next;
+ } else if (((next_header >> 12) & 0xf) == 0xf) {
+ /* The essential parts were the same, but the bitrate held an
+ invalid value - also reject */
+ GST_DEBUG_OBJECT (mp3parse, "next header invalid (bitrate)");
+ goto next;
+ }
+
+ valid = TRUE;
+
+ next:
+ /* almost accept as free frame */
+ if (layer == 1) {
+ rate = samplerate * (offset - 4 * padding + 4) / 48000;
+ } else {
+ rate = samplerate * (offset - padding + 1) / (144 >> lsf) / 1000;
+ }
+
+ if (valid) {
+ GST_LOG_OBJECT (mp3parse, "calculated rate %d", rate * 1000);
+ if (rate < 8 || (layer == 3 && rate > 640)) {
+ GST_DEBUG_OBJECT (mp3parse, "rate invalid");
+ if (rate < 8) {
+ /* maybe some hope */
+ continue;
+ } else {
+ GST_DEBUG_OBJECT (mp3parse, "aborting");
+ /* give up */
+ break;
+ }
+ }
+ *_rate = rate * 1000;
+ break;
+ } else {
+ /* avoid indefinite searching */
+ if (rate > 1000) {
+ GST_DEBUG_OBJECT (mp3parse, "exceeded sanity rate; aborting");
+ break;
+ }
+ }
+ }
+
+ return TRUE;
+ }
+
+static GstFlowReturn
+gst_mpeg_audio_parse_handle_frame (GstBaseParse * parse,
+ GstBaseParseFrame * frame, gint * skipsize)
{
GstMpegAudioParse *mp3parse = GST_MPEG_AUDIO_PARSE (parse);
GstBuffer *buf = frame->buffer;