bool MP4AV_RfcIsmaFragmenter(
MP4FileHandle mp4File,
MP4TrackId mediaTrackId,
MP4TrackId hintTrackId,
MP4SampleId sampleId,
u_int32_t sampleSize,
MP4Duration sampleDuration,
u_int16_t maxPayloadSize)
{
if (MP4AddRtpHint(mp4File, hintTrackId) == false ||
MP4AddRtpPacket(mp4File, hintTrackId, false) == false)
return false;
// Note: CELP is never fragmented
// so we assume the two byte AAC-hbr payload header
u_int8_t payloadHeader[4];
payloadHeader[0] = 0;
payloadHeader[1] = 16;
payloadHeader[2] = sampleSize >> 5;
payloadHeader[3] = (sampleSize & 0x1F) << 3;
if (MP4AddRtpImmediateData(mp4File, hintTrackId,
(u_int8_t*)&payloadHeader,
sizeof(payloadHeader)) == false)
return false;
u_int16_t sampleOffset = 0;
u_int16_t fragLength = maxPayloadSize - 4;
do {
if (MP4AddRtpSampleData(mp4File, hintTrackId,
sampleId,
sampleOffset,
fragLength) == false) return false;
sampleOffset += fragLength;
if (sampleSize - sampleOffset > maxPayloadSize) {
fragLength = maxPayloadSize;
if (MP4AddRtpPacket(mp4File, hintTrackId, false) == false) return false;
} else {
fragLength = sampleSize - sampleOffset;
if (fragLength) {
if (MP4AddRtpPacket(mp4File, hintTrackId, true) == false) return false;
}
}
} while (sampleOffset < sampleSize);
return MP4WriteRtpHint(mp4File, hintTrackId, sampleDuration);
}
//#define DEBUG_G711 1
extern "C" bool G711Hinter (MP4FileHandle mp4file,
MP4TrackId trackid,
uint16_t maxPayloadSize)
{
uint32_t numSamples;
uint8_t audioType;
MP4SampleId sampleId;
uint32_t sampleSize;
MP4TrackId hintTrackId;
uint8_t payload;
uint32_t bytes_this_hint;
uint32_t sampleOffset;
numSamples = MP4GetTrackNumberOfSamples(mp4file, trackid);
if (numSamples == 0) return false;
audioType = MP4GetTrackEsdsObjectTypeId(mp4file, trackid);
if (audioType != MP4_ALAW_AUDIO_TYPE &&
audioType != MP4_ULAW_AUDIO_TYPE) return false;
hintTrackId = MP4AddHintTrack(mp4file, trackid);
if (hintTrackId == MP4_INVALID_TRACK_ID) {
return false;
}
const char *type;
if (audioType == MP4_ALAW_AUDIO_TYPE) {
payload = 8;
type = "PCMA";
} else {
payload = 0;
type = "PCMU";
}
MP4SetHintTrackRtpPayload(mp4file, hintTrackId, type, &payload, 0,NULL,
false);
MP4Duration sampleDuration;
bool have_skip;
sampleId = 1;
sampleSize = MP4GetSampleSize(mp4file, trackid, sampleId);
sampleDuration = MP4GetSampleDuration(mp4file, trackid, sampleId);
have_skip = sampleDuration != sampleSize;
sampleOffset = 0;
bytes_this_hint = 0;
if (maxPayloadSize > 160) maxPayloadSize = 160;
while (1) {
if (bytes_this_hint == 0) {
#ifdef DEBUG_G711
printf("Adding hint/packet\n");
#endif
MP4AddRtpHint(mp4file, hintTrackId);
MP4AddRtpPacket(mp4file, hintTrackId, false); // marker bit 0
}
uint16_t bytes_left_this_packet;
bytes_left_this_packet = maxPayloadSize - bytes_this_hint;
if (sampleSize >= bytes_left_this_packet) {
MP4AddRtpSampleData(mp4file, hintTrackId,
sampleId, sampleOffset, bytes_left_this_packet);
bytes_this_hint += bytes_left_this_packet;
sampleSize -= bytes_left_this_packet;
sampleOffset += bytes_left_this_packet;
#ifdef DEBUG_G711
printf("Added sample with %u bytes\n", bytes_left_this_packet);
#endif
} else {
MP4AddRtpSampleData(mp4file, hintTrackId,
sampleId, sampleOffset, sampleSize);
bytes_this_hint += sampleSize;
#ifdef DEBUG_G711
printf("Added sample with %u bytes\n", sampleSize);
#endif
sampleSize = 0;
}
if (bytes_this_hint >= maxPayloadSize) {
// Write the hint
// duration is bytes written
MP4WriteRtpHint(mp4file, hintTrackId, bytes_this_hint);
#ifdef DEBUG_G711
printf("Finished packet - bytes %u\n", bytes_this_hint);
#endif
bytes_this_hint = 0;
}
if (sampleSize == 0) {
// next sample
if (have_skip && bytes_this_hint != 0) {
#ifdef DEBUG_G711
printf("duration - ending packet - bytes %u\n", bytes_this_hint);
#endif
MP4WriteRtpHint(mp4file, hintTrackId, bytes_this_hint);
bytes_this_hint = 0;
}
sampleId++;
if (sampleId > numSamples) {
// finish it and exit
if (bytes_this_hint != 0) {
MP4WriteRtpHint(mp4file, hintTrackId, bytes_this_hint);
}
return true;
}
sampleSize = MP4GetSampleSize(mp4file, trackid, sampleId);
sampleDuration = MP4GetSampleDuration(mp4file, trackid, sampleId);
have_skip = sampleDuration != sampleSize;
#ifdef DEBUG_G711
printf("Next sample %u - size %u %u\n", sampleId, sampleSize,
have_skip);
#endif
sampleOffset = 0;
}
}
return true; // will never reach here
}
bool MP4AV_RfcIsmaConcatenator(
MP4FileHandle mp4File,
MP4TrackId mediaTrackId,
MP4TrackId hintTrackId,
u_int8_t samplesThisHint,
MP4SampleId* pSampleIds,
MP4Duration hintDuration,
u_int16_t maxPayloadSize)
{
// handle degenerate case
if (samplesThisHint == 0) {
return true;
}
u_int8_t auPayloadHdrSize;
// LATER would be more efficient if this were a parameter
u_int8_t mpeg4AudioType =
MP4GetTrackAudioMpeg4Type(mp4File, mediaTrackId);
if (mpeg4AudioType == MP4_MPEG4_CELP_AUDIO_TYPE) {
auPayloadHdrSize = 1;
} else {
auPayloadHdrSize = 2;
}
// construct the new hint
if (MP4AddRtpHint(mp4File, hintTrackId) == false ||
MP4AddRtpPacket(mp4File, hintTrackId, true) == false) return false;
u_int8_t payloadHeader[2];
u_int16_t numHdrBits = samplesThisHint * auPayloadHdrSize * 8;
payloadHeader[0] = numHdrBits >> 8;
payloadHeader[1] = numHdrBits & 0xFF;
if (MP4AddRtpImmediateData(mp4File, hintTrackId,
(u_int8_t*)&payloadHeader,
sizeof(payloadHeader)) == false) return false;
u_int8_t i;
// first the headers
for (i = 0; i < samplesThisHint; i++) {
MP4SampleId sampleId = pSampleIds[i];
u_int32_t sampleSize =
MP4GetSampleSize(mp4File, mediaTrackId, sampleId);
if (auPayloadHdrSize == 1) {
// AU payload header is 6 bits of size
// follow by 2 bits of the difference between sampleId's - 1
payloadHeader[0] = sampleSize << 2;
} else { // auPayloadHdrSize == 2
// AU payload header is 13 bits of size
// follow by 3 bits of the difference between sampleId's - 1
payloadHeader[0] = sampleSize >> 5;
payloadHeader[1] = (sampleSize & 0x1F) << 3;
}
if (i > 0) {
payloadHeader[auPayloadHdrSize - 1]
|= ((sampleId - pSampleIds[i-1]) - 1);
}
#if 0
printf("sample %u size %u %02x %02x prev sample %d\n",
sampleId, sampleSize, payloadHeader[0],
payloadHeader[1], pSampleIds[i-1]);
#endif
if (MP4AddRtpImmediateData(mp4File, hintTrackId,
(u_int8_t*)&payloadHeader,
auPayloadHdrSize) == false)
return false;
}
// then the samples
for (i = 0; i < samplesThisHint; i++) {
MP4SampleId sampleId = pSampleIds[i];
u_int32_t sampleSize =
MP4GetSampleSize(mp4File, mediaTrackId, sampleId);
if (MP4AddRtpSampleData(mp4File, hintTrackId,
sampleId, 0, sampleSize) == false) return false;
}
// write the hint
return MP4WriteRtpHint(mp4File, hintTrackId, hintDuration);
}
extern "C" bool MP4AV_Rfc3016LatmHinter (MP4FileHandle mp4File,
MP4TrackId mediaTrackId,
u_int16_t maxPayloadSize)
{
u_int32_t numSamples = MP4GetTrackNumberOfSamples(mp4File, mediaTrackId);
u_int32_t maxSampleSize = MP4GetTrackMaxSampleSize(mp4File, mediaTrackId);
MP4Duration sampleDuration =
MP4AV_GetAudioSampleDuration(mp4File, mediaTrackId);
if (sampleDuration == MP4_INVALID_DURATION) {
return false;
}
if (numSamples == 0 || maxSampleSize == 0) {
return false;
}
/* get the mpeg4 video configuration */
u_int8_t* pAudioSpecificConfig;
u_int32_t AudioSpecificConfigSize;
if (MP4GetTrackESConfiguration(mp4File, mediaTrackId,
&pAudioSpecificConfig,
&AudioSpecificConfigSize) == false)
return false;
if (pAudioSpecificConfig == NULL ||
AudioSpecificConfigSize == 0) return false;
uint8_t channels = MP4AV_AacConfigGetChannels(pAudioSpecificConfig);
uint32_t freq = MP4AV_AacConfigGetSamplingRate(pAudioSpecificConfig);
uint8_t type = MP4AV_AacConfigGetAudioObjectType(pAudioSpecificConfig);
uint8_t *pConfig;
uint32_t configSize;
MP4AV_LatmGetConfiguration(&pConfig, &configSize,
pAudioSpecificConfig, AudioSpecificConfigSize);
free(pAudioSpecificConfig);
if (pConfig == NULL || configSize == 0) {
CHECK_AND_FREE(pConfig);
return false;
}
MP4TrackId hintTrackId =
MP4AddHintTrack(mp4File, mediaTrackId);
if (hintTrackId == MP4_INVALID_TRACK_ID) {
free(pConfig);
return false;
}
u_int8_t payloadNumber = MP4_SET_DYNAMIC_PAYLOAD;
char buffer[10];
if (channels != 1) {
snprintf(buffer, sizeof(buffer), "%u", channels);
}
/* convert it into ASCII form */
char* sConfig = MP4BinaryToBase16(pConfig, configSize);
free(pConfig);
if (sConfig == NULL ||
MP4SetHintTrackRtpPayload(mp4File, hintTrackId,
"MP4A-LATM", &payloadNumber, 0,
channels != 1 ? buffer : NULL) == false) {
MP4DeleteTrack(mp4File, hintTrackId);
return false;
}
uint32_t profile_level;
// from gpac code
switch (type) {
case 2:
if (channels <= 2) profile_level = freq <= 24000 ? 0x28 : 0x29;
else profile_level = freq <= 48000 ? 0x2a : 0x2b;
break;
case 5:
if (channels <= 2) profile_level = freq < 24000 ? 0x2c : 0x2d;
else profile_level = freq <= 48000 ? 0x2e : 0x2f;
break;
default:
if (channels <= 2) profile_level = freq < 24000 ? 0x0e : 0x0f;
else profile_level = 0x10;
break;
}
/* create the appropriate SDP attribute */
char* sdpBuf = (char*)malloc(strlen(sConfig) + 128);
if (sdpBuf == NULL) {
free(sConfig);
MP4DeleteTrack(mp4File, hintTrackId);
return false;
}
snprintf(sdpBuf,
strlen(sConfig) + 128,
"a=fmtp:%u profile-level-id=%u; cpresent=0; config=%s;\015\012",
payloadNumber,
profile_level,
sConfig);
/* add this to the track's sdp */
bool val = MP4AppendHintTrackSdp(mp4File, hintTrackId, sdpBuf);
free(sConfig);
free(sdpBuf);
if (val == false) {
MP4DeleteTrack(mp4File, hintTrackId);
return false;
}
for (MP4SampleId sampleId = 1; sampleId <= numSamples; sampleId++) {
uint8_t buffer[32];
uint32_t offset = 0;
uint32_t sampleSize =
MP4GetSampleSize(mp4File, mediaTrackId, sampleId);
uint32_t size_left = sampleSize;
while (size_left > 0) {
if (size_left > 0xff) {
size_left -= 0xff;
buffer[offset] = 0xff;
} else {
buffer[offset] = size_left;
size_left = 0;
}
offset++;
}
if (MP4AddRtpHint(mp4File, hintTrackId) == false ||
MP4AddRtpPacket(mp4File, hintTrackId, true) == false ||
MP4AddRtpImmediateData(mp4File, hintTrackId,
buffer, offset) == false ||
MP4AddRtpSampleData(mp4File, hintTrackId,
sampleId, 0, sampleSize) == false ||
MP4WriteRtpHint(mp4File, hintTrackId, sampleDuration) == false) {
MP4DeleteTrack(mp4File, hintTrackId);
return false;
}
}
return true;
}
