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https://projects.vdr-developer.org/git/vdr-plugin-softhddevice.git
synced 2023-10-10 19:16:51 +02:00
Search audio sync inside PES packets.
This commit is contained in:
Johns
parent
0d63fac2e8
commit
d2606a5d5f
144
softhddev.c
144
softhddev.c
@ -1,7 +1,7 @@
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///
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/// @file softhddev.c @brief A software HD device plugin for VDR.
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///
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/// Copyright (c) 2011 by Johns. All Rights Reserved.
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/// Copyright (c) 2011, 2012 by Johns. All Rights Reserved.
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///
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/// Contributor(s):
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///
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@ -59,6 +59,122 @@ static enum CodecID AudioCodecID; ///< current codec id
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extern void AudioTest(void); // FIXME:
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/**
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** mpeg bitrate table.
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**
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** BitRateTable[Version][Layer][Index]
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*/
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static const uint16_t BitRateTable[2][4][16] = {
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// MPEG Version 1
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{{},
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{0, 32, 64, 96, 128, 160, 192, 224, 256, 288, 320, 352, 384, 416, 448,
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0},
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{0, 32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 384, 0},
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{0, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 0}},
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// MPEG Version 2 & 2.5
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{{},
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{0, 32, 48, 56, 64, 80, 96, 112, 128, 144, 160, 176, 192, 224, 256, 0},
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{0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160, 0},
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{0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160, 0}
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}
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};
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/**
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** mpeg samperate table.
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*/
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static const uint16_t SampleRateTable[4] = {
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44100, 48000, 32000, 0
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};
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/**
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** Find sync in audio packet.
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**
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** @param avpkt audio packet
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**
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** From: http://www.mpgedit.org/mpgedit/mpeg_format/mpeghdr.htm
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**
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** AAAAAAAA AAABBCCD EEEEFFGH IIJJKLMM
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**
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** o a 11x frame sync
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** o b 2x mpeg audio version (2.5, reserved, 2, 1)
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** o c 2x layer (reserved, III, II, I)
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** o e 2x BitRate index
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** o f 2x SampleRate index
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** o g 1x Paddding bit
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** o .. doesn't care
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**
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** frame length:
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** Layer I:
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** FrameLengthInBytes = (12 * BitRate / SampleRate + Padding) * 4
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** Layer II & III:
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** FrameLengthInBytes = 144 * BitRate / SampleRate + Padding
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*/
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static int FindAudioSync(const AVPacket * avpkt)
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{
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int i;
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const uint8_t *data;
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i = 0;
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data = avpkt->data;
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while (i < avpkt->size - 4) {
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if (data[i] == 0xFF && (data[i + 1] & 0xFC) == 0xFC) {
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int mpeg2;
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int mpeg25;
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int layer;
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int bit_rate_index;
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int sample_rate_index;
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int padding;
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int bit_rate;
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int sample_rate;
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int frame_size;
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mpeg2 = !(data[i + 1] & 0x08) && (data[i + 1] & 0x10);
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mpeg25 = !(data[i + 1] & 0x08) && !(data[i + 1] & 0x10);
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layer = 4 - ((data[i + 1] >> 1) & 0x03);
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bit_rate_index = (data[i + 2] >> 4) & 0x0F;
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sample_rate_index = (data[i + 2] >> 2) & 0x03;
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padding = (data[i + 2] >> 1) & 0x01;
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sample_rate = SampleRateTable[sample_rate_index];
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if (!sample_rate) { // no valid sample rate try next
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i++;
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continue;
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}
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sample_rate >>= mpeg2; // mpeg 2 half rate
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sample_rate >>= mpeg25; // mpeg 2.5 quarter rate
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bit_rate = BitRateTable[mpeg2 | mpeg25][layer][bit_rate_index];
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bit_rate *= 1000;
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switch (layer) {
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case 1:
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frame_size = (12 * bit_rate) / sample_rate;
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frame_size = (frame_size + padding) * 4;
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break;
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case 2:
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case 3:
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default:
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frame_size = (144 * bit_rate) / sample_rate;
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frame_size = frame_size + padding;
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break;
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}
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Debug(3,
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"audio: mpeg%s layer%d bitrate=%d samplerate=%d %d bytes\n",
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mpeg25 ? "2.5" : mpeg2 ? "2" : "1", layer, bit_rate,
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sample_rate, frame_size);
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if (i + frame_size < avpkt->size - 4) {
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if (data[i + frame_size] == 0xFF
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&& (data[i + frame_size + 1] & 0xFC) == 0xFC) {
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Debug(3, "audio: mpeg1/2 found at %d\n", i);
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return i;
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}
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}
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// no valid frame size or no continuation, try next
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}
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i++;
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}
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return -1;
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}
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/**
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** Play audio packet.
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**
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@ -74,13 +190,10 @@ void PlayAudio(const uint8_t * data, int size, uint8_t id)
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if (BrokenThreadsAndPlugins) {
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return;
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}
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// PES header 0x00 0x00 0x01 ID
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// ID 0xBD 0xC0-0xCF
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// channel switch: SetAudioChannelDevice: SetDigitalAudioDevice:
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// Detect audio code
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// MPEG-PS mp2 MPEG1, MPEG2, AC3
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// PES header 0x00 0x00 0x01 ID
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// ID 0xBD 0xC0-0xCF
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if (size < 9) {
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Error(_("[softhddev] invalid audio packet\n"));
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@ -111,6 +224,9 @@ void PlayAudio(const uint8_t * data, int size, uint8_t id)
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Error(_("[softhddev] invalid audio packet\n"));
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return;
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}
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// Detect audio code
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// MPEG-PS mp2 MPEG1, MPEG2, AC3
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// Syncword - 0x0B77
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if (data[0] == 0x0B && data[1] == 0x77) {
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if (!MyAudioDecoder) {
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@ -141,9 +257,23 @@ void PlayAudio(const uint8_t * data, int size, uint8_t id)
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// no start package
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// FIXME: Nick/Viva sends this shit, need to find sync in packet
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// FIXME: otherwise it takes too long until sound appears
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if (AudioCodecID == CODEC_ID_NONE) {
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Debug(3, "[softhddev]%s: ??? %d\n", __FUNCTION__, id);
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return;
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avpkt->data = (void *)data;
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avpkt->size = size;
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n = FindAudioSync(avpkt);
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if (n < 0) {
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return;
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}
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if (!MyAudioDecoder) {
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MyAudioDecoder = CodecAudioNewDecoder();
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}
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CodecAudioOpen(MyAudioDecoder, NULL, CODEC_ID_MP2);
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AudioCodecID = CODEC_ID_MP2;
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data += n;
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size -= n;
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}
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}
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